US20080174478A1 - Waterproof combined global positioning receiver and two-way radio and method of waterproof enclosure fabrication - Google Patents
Waterproof combined global positioning receiver and two-way radio and method of waterproof enclosure fabrication Download PDFInfo
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- US20080174478A1 US20080174478A1 US11/870,717 US87071707A US2008174478A1 US 20080174478 A1 US20080174478 A1 US 20080174478A1 US 87071707 A US87071707 A US 87071707A US 2008174478 A1 US2008174478 A1 US 2008174478A1
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- Prior art keywords
- gps
- radio unit
- housing
- waterproof
- radio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/061—Hermetically-sealed casings sealed by a gasket held between a removable cover and a body, e.g. O-ring, packing
Definitions
- the present invention relates generally to a combined global positioning system receiver and radio unit. More specifically, the present invention relates to a combined global positioning system navigation unit and two-way radio communications unit that includes a substantially waterproof enclosure for protection of the electronic components contained therein, and method of fabrication of the substantially waterproof enclosure.
- a global positioning system is an electronic satellite navigation system that permits a user of the system to determine his or her position with respect to the Earth. Global positioning may be accomplished through the use of a handheld GPS receiver device that detects and decodes signals from a number of satellites orbiting the Earth. The signals from each of these satellites indicate the position of the satellite and the time at which the signal was sent. To decode the satellite signals, known as spread spectrum signals, and thereby calculate the desired navigational data, a GPS receiver must first “find” or acquire the signals emitted from a minimum number of satellites. Once the receiver is “locked on” to the spread spectrum signals, continuous real-time calculation and monitoring of the user's global position and other navigational data (e.g., velocity of movement) may be performed.
- GPS global positioning system
- GPS receivers have clocks that are synchronized with clocks in each of the satellites to determine how long it takes the signals to travel from the satellites to the receiver.
- GPS receivers require a highly accurate internal frequency reference in order to acquire the spread spectrum GPS satellite signals.
- acquiring spread spectrum satellite signals from a sufficient number of satellites to perform calculations requires determining the frequency of oscillation of the crystal oscillator utilized in the GPS receiver.
- the GPS receiver can calculate the user's position (e.g., latitude and longitude) by geometric triangulation. Upon acquiring signals from a minimum of four satellites, the GPS receiver can also calculate the user's altitude. In addition, GPS receivers are able to calculate the user's speed and direction of travel by continuously updating the user's position. Accordingly, GPS receivers are highly valuable and widely used in navigational systems because of their ability to accurately compute the user's position on or near the Earth in real-time, even as the user is moving.
- the first combined portable GPS receiver and two-way radio unit that is capable of displaying the location of at least one other such unit (as well as its own location) was recently developed by Garmin International, Inc. of Olathe, Kans. and is described in U.S. Pat. No. 6,373,430 (hereinafter “the '430 patent”).
- the combined global positioning system receiver and two-way radio unit of the '430 patent is capable of communicating with one or more other such units over a wireless radio network, wherein each of the units is adapted to transmit over the network radio signals indicative of that unit's location.
- the GPS/radio unit includes a GPS receiver for receiving satellite signals from a plurality of satellites, a processor coupled with the GPS receiver for calculating the location of the GPS/radio unit as a function of the received satellite signals, and a radio receiver coupled with the processor for receiving the radio signals transmitted by the other units.
- the processor is adapted to identify the location of the other units based upon the received radio signals.
- the GPS/radio unit also includes a display for indicating its own location as well as the location of at least one of the other units.
- the GPS/radio unit of the '430 patent includes a portable, handheld housing for housing the unit electronic components, e.g., the GPS receiver, the processor, the radio receiver and the display.
- the electronic components contained within the housing are vulnerable to potential harmful effects which may be caused by ingress of water (or other liquid) through the housing. Such ingress is of concern if the GPS/radio unit is dropped into a puddle, pond, river, stream or other body of water, if water or other liquid is splashed onto the GPS/radio unit, or if the user of the GPS/radio unit is caught in inclement weather such as rain or snow.
- the inventors have recognized that it would be advantageous to provide a combined two-way radio communications unit and GPS navigation unit configured for wirelessly communicating with one or more other such units and which includes a substantially waterproof enclosure for protecting the electronic components housed therein from the potentially harmful effects of liquid ingress. It would be further advantageous to provide such substantially waterproof enclosure in a compact, robust yet relatively inexpensive form, the components of which are easy to fabricate and assemble.
- the present invention includes a combined global positioning system receiver and two-way radio communications unit (GPS/radio unit) that includes a substantially waterproof enclosure for protection of the electronic components contained therein.
- GPS/radio unit is configured for wirelessly communicating with at least one other such GPS/radio unit over a wireless radio network, the at least one other GPS/radio unit being configured for transmitting radio signals indicative of that unit's location.
- the GPS/radio unit includes a global positioning system receiver for receiving satellite signals from a plurality of satellites, a processor coupled with the global positioning system receiver for calculating the location of the GPS/radio unit as a function of the received satellite signals, and a radio transceiver coupled with the processor for receiving the radio signals transmitted by the at least one other GPS/radio unit and for transmitting a radio signal to the at least one other GPS/radio unit.
- the transmitted radio signal is indicative of a location of the GPS/radio unit.
- the processor is configured to identify the location of the at least one other GPS/radio unit based upon the received radio signals.
- the GPS/radio unit also includes a display for indicating the location of at least one of the other GPS/radio units and a substantially waterproof enclosure for housing the global positioning system receiver, the processor, the radio transceiver and the display.
- the present invention further encompasses a substantially waterproof enclosure for a combined global positioning system receiver and two-way radio communications unit (GPS/radio unit).
- the substantially waterproof enclosure includes a first housing section and a second housing section configured to cooperatively mate with one another in a watertight relationship.
- the waterproof enclosure may further include a cover configured to be positioned over a plurality of tubular structures which protrude upwardly from a top end wall of the second housing section.
- the cover includes a body portion which may be received in a cavity formed upon cooperatively coupling the first and second housing sections to one another.
- the present invention encompasses a method for fabricating a substantially waterproof enclosure for a combined global positioning system navigation unit and two-way radio communications unit (GPS/radio unit).
- the method comprises forming the first and second housing sections, preferably by molding.
- the first housing section is then subjected to a second molding operation wherein an elastomer may be selectively placed to provide elastomeric covers over apertures at locations of movable users input elements to be carried by the GPS/radio unit and to provide an elastomeric gasket along a peripheral edge of the first housing section to be placed and compressed against a cooperatively configured peripheral edge of the second housing section upon assembly of the two housing sections.
- the method further comprises disposing components of a GPS/radio unit that is configured for wirelessly communicating with at least one other such unit at least partially within an enclosure or section thereof having at least one opening through a wall thereof, and sealing the at least one opening to substantially prevent the ingress of water or other liquid through the at least one opening.
- the method further comprises placing an elastomeric cover over a portion of the enclosure in an interfering relationship with an outer wall thereof to form a substantially waterproof seal therewith. Additional and more specific aspects of providing waterproofing to different elements and features of the substantially waterproof enclosure, and of forming the housing sections of the waterproof enclosure, are also disclosed herein and encompassed by the present invention.
- FIG. 1 is a block diagram of the components of an exemplary combined global positioning system receiver and two-way communications unit (GPS/radio unit);
- FIG. 2 is a front perspective view of an exemplary, assembled GPS/radio unit in accordance with the present invention, which combined GPS/radio unit includes a waterproof enclosure for protection of the electronic components contained therein;
- FIG. 3 is a front elevational view of the GPS/radio unit of FIG. 2 ;
- FIG. 4 is a front perspective view of the first housing section of a two section waterproof enclosure in accordance with the present invention.
- FIG. 5 is a rear perspective view of the first housing section of FIG. 4
- FIG. 5A is an enlarged elevation of the location thereon wherein a microphone is to be placed
- FIG. 5B is an enlarged cross sectional view of a peripheral edge of a portion of the first housing section and an elastomeric gasket formed thereon;
- FIG. 6 is a side cross-sectional view taken along line 6 - 6 of FIG. 3 ;
- FIG. 7 is a side cross-sectional view taken along line 7 - 7 of FIG. 3 ;
- FIG. 8 is a rear perspective view of the second housing section of the two section waterproof enclosure in accordance with the present invention.
- FIG. 9 is a front perspective view of the second housing section of FIG. 8 ;
- FIG. 10 is a right side elevational view of the second housing section of FIG. 8 ;
- FIG. 11 is a rear elevational view of an exemplary assembled GPS/radio unit in accordance with the present invention.
- FIG. 12 is a front elevational view of the second housing section of FIG. 8 ;
- FIG. 13 is a front perspective view of the second housing section of FIG. 8 ;
- FIG. 14 is a rear elevational view of the second housing section of FIG. 8 ;
- FIG. 15 is a cross-sectional view taken along line 15 - 15 of FIG. 14 ;
- FIG. 16 is a right side elevational view of the assembled GPS/radio unit of FIG. 2 ;
- FIG. 17 is a left side elevational view of an assembled GPS/radio unit of FIG. 2 .
- the present invention is directed to a combined global positioning system receiver and two-way radio communications unit that is configured for wirelessly communicating with one or more other such units and that includes a waterproof enclosure for protection of the electronic components contained therein.
- the particular embodiments described herein are intended in all respects to be illustrative rather than restrictive. Additional embodiments will become apparent to those of ordinary skill in the art to which the present invention pertains without departing from its scope.
- GPS/radio unit a block diagram of the electronic components of an exemplary combined global positioning system and two-way radio communications unit (GPS/radio unit) is illustrated.
- the combined GPS/radio unit is denoted generally by reference numeral 10 , and is sized and configured as a handheld unit.
- the GPS/radio unit 10 of the present invention is preferably capable of direct voice and data communications, such as the unit disclosed in U.S. Pat. No. 6,373,430, incorporated herein by specific reference.
- the GPS/radio unit 10 includes a GPS receiver 12 , a GPS antenna 14 , a radio transceiver 16 and a radio antenna 18 .
- the GPS receiver 12 and radio transceiver 16 are electronically coupled with a processor 20 that has an associated memory 22 for storing information such as cartographic data (e.g., electronic maps).
- the cartographic data may be stored on cartridges that can be removably attached and operably coupled to the unit. For example, an electronic map of a particular city or National Park may be stored in a single cartridge.
- the memory 22 may also store historical location data for the GPS/radio unit 10 or for other units that have transmitted location data to the unit 10 .
- the combined GPS/radio unit 10 also includes a microphone 24 , a speaker 26 , a user input 28 and a display 30 .
- the display 30 comprises a liquid crystal display (LCD).
- the user input 28 comprises a five-way cursor for accessing data and navigating within a menu-driven display program.
- the user input 28 may comprise an alphanumeric keypad, such as a telephone keypad, which may be used to select and input a name or other identifier for the unit using any combination of the letters, numbers, or symbols which are available on the keypad.
- the user input 28 may comprise a microphone/voice recognition input, touch screen, or any other user input 28 known to those of ordinary skill in the art. All such variations are contemplated to be within the scope of the present invention.
- the user input 28 is generally centrally located within aperture 70 with respect to the exterior surface 48 of the front wall 40 (see FIG. 4 ) of the first housing section 36 of the GPS/radio unit 10 to facilitate one-handed user operation, as more fully described below.
- the GPS/radio unit 10 of the present invention includes a, waterproof enclosure 32 for housing the internal components thereof and protecting the same from the potential harmful effects of water ingress.
- water encompasses and includes not only water per se, but also any other liquid, and is not limited to such substances in a liquid state but also in a vapor state.
- the illustrated waterproof enclosure 32 includes a two-section plastic housing 34 and a flexible elastomeric cover 132 positioned to cover an uppermost region of the two-section plastic housing 34 , as more fully described below.
- the two-section plastic housing 34 is comprised of a first housing section 36 and a second housing section 38 .
- the first and second housing sections 36 , 38 fit together in a water tight, cooperatively mated relationship to define an internal compartment or chamber in which the internal electronic components of the GPS/radio unit 10 (e.g., the GPS receiver 12 , the processor 20 , the radio transceiver 16 , the radio antenna 18 , the GPS antenna 14 and the display 30 , as illustrated in FIG. 1 ) may be enclosed and protected. Fabrication of the first and second housing sections 36 and 38 and assembly of the GPS/radio unit 10 is more fully described below.
- the first housing section 36 of the two-section plastic housing 34 is shown.
- the first housing section 36 includes a front wall 40 , first and second side walls 42 , 44 , a top wall 45 and a bottom wall 46 .
- An exterior surface 48 of the front wall 40 is visible from the front of the GPS/radio unit 10 when the GPS/radio unit 10 is assembled.
- An interior surface 50 of the front wall 40 , the side walls 42 , 44 , the top wall 45 and the bottom wall 46 forms an interior cavity 52 within which a number of the internal electronic components of the GPS/radio unit 10 may be positioned.
- the interior cavity 52 of the first housing section 36 and an interior cavity 97 of the second housing section 38 cooperate with one another to form a substantially water tight internal compartment wherein the internal components of the GPS/radio unit 10 may be enclosed.
- each housing section 36 , 38 is preferably formed as a single-piece rigid plastic component by injection molding, although other suitable molding techniques may be employed.
- a polycarbonate is currently preferred as the material for first and second housing sections 36 and 38 .
- the first, or front, housing section may be formed in a two part molding operation wherein the rigid plastic component formed in a first mold is placed in a second mold and an elastomer is selectively injected to into a cavity defined over peripheral edge 202 of first housing section 36 to form an elastomeric gasket 200 extending along the peripheral edge 202 of first housing section 36 which will engage a cooperatively configured peripheral edge 204 of second, or rear, housing section 38 .
- Elastomeric gasket 200 may best be seen in FIGS. 4 , 5 , and 5 B.
- a currently preferred material for elastomeric gasket 200 is a styrenic thermoplastic elastomer.
- elastomeric gasket 200 is formed over, and in alignment with, peripheral edge 202 , which includes a flat 206 and a protrusion 208 extending therealong in the center of peripheral edge 202 .
- Elastomeric gasket 200 is formed with a small seal bead 210 protruding upwardly therefrom. Seal bead 210 is compressed against, and seals with, a polished, flat surface comprising peripheral edge 204 of second housing section 38 upon assembly of the first and second housing sections 36 and 38 .
- the second part of the molding operation may also be used to form elastomeric covers 86 and 88 over apertures 85 in front housing section 36 , the elastomeric covers 86 and 88 being adhered in place within the outward ends of apertures 85 during the molding thereof.
- the second part of the molding operation for first housing section 36 may further be used to form a portion of optional gripping region 176 which, as illustrated, may be contiguous with elastomeric gasket 200 or which may be discrete and separate therefrom.
- another portion of optional gripping region 176 may be formed on second housing section 38 in a second of a two part molding operation performed thereon.
- the top wall 45 of the first housing section 36 and the portion of each side wall 42 , 44 proximate the top wall 45 include a continuous, upwardly extending ridge 54 protruding therefrom.
- the upwardly extending ridge 54 is molded to be coextensive with the exterior surface 48 of the front wall 40 and the side walls 42 , 44 .
- the second housing section 38 also includes a continuous ridge 93 extending upwardly from a top end wall 96 and side walls 92 , 94 thereof.
- the two upwardly extending ridges 54 , 93 cooperate with one another to form a cavity 99 (portions of cavity 99 depicted in FIGS. 5 and 9 ) in which the body portion 134 of the flexible elastomeric cover 132 which protects the GPS and radio antennas 14 and 18 , respectively, from impact damage and water ingress may be received, as more fully described below.
- the front wall 40 of the first housing section 36 includes an opening 55 ( FIG. 5 ) therein sized and shaped to enable viewing of the display 30 therethrough, the display 30 typically being slightly recessed from the plane of the exterior surface 48 of the front wall 40 . It is currently preferred that the opening 55 in the front wall 40 and the display 30 are positioned with respect to the exterior surface 48 of the front wall 40 off center toward an upper region 56 thereof as shown.
- a transparent plastic lens 58 is positioned over the surface of the display 30 which is exposed through the opening 55 in the front wall 40 proximate the exterior surface 48 thereof, as well as over the portion 57 of the exterior surface 48 of the front wall 40 which surrounds the display 30 .
- the transparent plastic lens 58 includes a shape similar to that of the display 30 and is slightly larger than the display 30 . That is, the transparent plastic lens 58 extends beyond the display 30 around an outer periphery thereof and is secured to the portion 57 of the exterior surface 48 of the front wall 40 which surrounds the display 30 by a double-sided adhesive element 53 .
- Suitable adhesive elements include an acrylic foam sheet with adhesive on both sides and offered by 3M as product #4920, and a double-sided adhesive element 5000 N offered by Nitto-Denko.
- the periphery of the transparent plastic lens 58 forms a water tight seal with the exterior surface 48 of the front wall 40 , substantially preventing water from contacting the display 30 and thus from entering the internal compartment of the GPS/radio unit 10 through the display opening 55 .
- the front wall 40 of the first housing section 36 includes a number of small openings 60 therethrough ( FIGS. 4 and 5 ). It is currently preferred that the small openings 60 through the front wall 40 are positioned off center toward a lower region 62 thereof as shown, and the speaker 26 correspondingly positioned within the interior cavity 52 .
- the cone 64 of speaker 26 is formed of a suitable waterproof material also well adapted to function as a speaker cone, such as MYLAR® polymer.
- a sealing element in the form of an 0-ring or gasket 66 (a foam gasket being currently preferred) is then adhered to an annular protrusion 59 on the interior surface 50 of the front wall 40 and a periphery of the cone of speaker 26 , which is also mechanically clamped using, e.g., a metal clamp frame 68 , to the protrusion 59 (see FIG. 6 ).
- the metal clamp frame 68 latches over the 0-ring or gasket 66 , pressing against a periphery of the cone of speaker 26 and a water tight seal is formed using the material of the speaker cone 64 as a water-impermeable membrane to prevent water from entering the internal compartment of the GPS/radio unit 10 .
- Microphone 24 is mounted to the main printed circuit board (not shown) at a location to be positioned in alignment with, and to be received within, substantially annular skirt 220 on the interior surface 50 of front wall 40 of first housing section 36 (see FIGS. 5 and 5A ).
- Aperture 222 extends through the wall of front housing section within annular skirt 220 , and is covered with an air and sound permeable, and water impermeable, hydrophobic patch 224 in the form of a membrane comprising a nonwoven fabric such as, by way of example only, VERSAPORETM V-5000R fabric from Gelman Sciences.
- Hydrophobic patch 224 is secured at its periphery over aperture 222 by a suitable adhesive 226 such as, by way of example only, a 3M product # 468 transfer adhesive.
- the user input 28 comprises a five-way cursor for accessing data and navigating within a menu-driven display program.
- the user input 28 may comprise an alphanumeric pad, microphone/voice recognition input, or the like, as known to those of ordinary skill in the art.
- the five-way cursor user input 28 illustrated enables navigation in four directions (generally up, down and to each side) by appropriately directed lateral pressure, a selection being made and communicated to the processor 20 by depression of the user input 28 .
- a flexible elastomeric cover 72 ( FIG. 6 ) may be positioned over the user input 28 .
- the flexible elastomeric cover 72 includes a cup-shaped body portion 74 having a closed top end 76 and an open bottom end 78 , the body portion 74 forming a cavity sized and shaped to receive the user input 28 .
- Extending about a periphery of the open bottom end 78 is a flange 80 , the terminal end 82 of which is turned upwardly from the plane of the flange 80 .
- the user input 28 is fitted into the cavity formed by the body portion 74 and the upwardly turned terminal end 82 of the flange 80 is fitted within a groove 84 ( FIG. 5 ) protruding from the interior surface 50 front wall 40 in a resilient, compressed interference fit.
- the flexible elastomeric cover 72 forms a water tight seal with the first housing section 36 , substantially preventing water from contacting the user input 28 through the aperture 70 in the front wall 40 and thereby preventing water from entering the internal compartment of the GPS/radio unit 10 through the aperture 70 .
- the front wall 40 of the first housing section 36 may include one or more additional apertures 85 through which one or more control buttons may protrude toward the exterior surface 48 of the front wall 40 .
- the GPS/radio unit 10 includes two control buttons (not shown) protruding through the front wall 40 of the first housing section 36 and covered by elastomeric covers 86 , 88 .
- the first control button covered by elastomeric cover 86 may, for instance, be coupled with the processor 20 so that depressing the first control button causes the GPS/radio unit 10 to immediately transmit a radio signal over the network indicative of the location of the GPS/radio unit 10 .
- the second control button covered by elastomeric cover 88 may, for instance, be coupled with the processor 20 so that depressing the second control button causes the GPS/radio unit 10 to immediately transmit a radio signal over the network requesting that users of other units transmit their locations over the network.
- the control buttons may have any number of additional or alternative functions including, but not limited to, power, volume adjustment and the like.
- flexible elastomeric covers 86 , 88 may be disposed over the control buttons in a manner similar to that described above with regard to the user input 28 and the corresponding aperture 70 in the front wall 40 of the first housing section 36 .
- those portions of the housing section 36 overlying the control buttons may be made thin-walled and flexible enough to permit depression of the control buttons.
- flexible elastomeric covers 86 , 88 be molded onto front housing section 36 in a second part of a two-part injection molding operation used to form front housing section 36 .
- the second housing section 38 is preferably formed as a single molded component and includes a rear wall 90 , first and second side walls 92 , 94 , a bottom end wall 95 and a top end wall 96 .
- the top and bottom end walls 96 , 95 and the first and second side walls 92 , 94 form an interior cavity 97 within which a number of the internal electronic components of the GPS/radio unit 10 may be positioned.
- the top end wall 96 of the second housing section 38 and the portion of each side wall 92 , 94 proximate the top end wall 96 include an upwardly extending ridge 93 ( FIG. 9 ) protruding therefrom.
- the upwardly extending ridge 93 is molded to be coextensive with the exterior surface 150 of the rear wall 90 of the second housing section 38 and the side walls 92 , 94 .
- the upwardly extending ridge 93 of the second housing section 38 cooperates with the upwardly extending ridge 54 of the top wall 45 of the first housing section 36 to form a cavity 99 (portions of cavity 99 illustrated in FIGS. 5 and 9 ) in which the body portion 134 of the flexible elastomeric cover 132 may be received.
- the first side wall 92 includes an extended portion 98 thereof.
- the extended portion 98 includes a control button 100 (or “push to talk” button) externally facing therefrom which may be depressed by the user when he or she desires to communicate with the user of another unit.
- a control button 100 or “push to talk” button
- Positioned to correspond with the control button 100 is an elongated slot 102 through the first side wall 92 ( FIGS. 9 and 13 ).
- a flex circuit 103 extends from the control button 100 through the elongated slot 102 and into the interior cavity 97 .
- a bead of room temperature vulcanizing (RTV) sealant is applied at the location of the elongated slot 102 .
- the RTV sealant is typically applied in a viscous liquid or gel-like state and cures at room temperature, creating a flexible elastomeric seal at the point of application.
- RTV sealant cures, a water tight seal is formed about the flex circuit 103 as it passes through the elongated slot 102 , preventing water from passing therethrough.
- the second side wall 94 of the second housing section 38 includes an aperture 104 therein which is positioned to correspond with an audio jack 106 secured in a jack compartment 107 to the rear wall 90 of the second housing section 38 .
- an audio component e.g., a headset
- a cover 108 including a flexible elastomeric plug for insertion into the aperture 104 may be positioned over the aperture 104 when the audio jack 106 is not in use.
- An opening 110 ( FIG. 13 ) in the wall of jack compartment 107 permits communication between the audio jack 106 and the processor 20 (e.g., one or more wires may extend therethrough). While the cover 108 and/or the male plug adapter provided by the audio component (not shown) provide a certain amount of protection from water ingress through aperture 104 , to ensure that water may not leak beyond the audio jack 106 through the opening 110 in the wall of the jack compartment 107 and damage the internal components of the GPS/radio unit 10 , a dot of RTV sealant is applied at the location of the opening 110 as discussed above with regard to the elongated slot 102 in the first side wall 92 .
- the top end wall 96 of the second housing section 38 includes at least two apertures 112 , 114 therein, the first aperture 112 having a cross-sectional dimension (e.g., diameter if the apertures are round) greater than the cross-sectional dimension of the second aperture 114 .
- Extending from an external surface 115 of the top end wall 96 and positioned to correspond with the apertures 112 , 114 is a pair of integral tubular structures 116 , 118 , access to the interior of the tubular structures 116 , 118 being permitted from the interior cavity 97 of the GPS/radio unit 10 through the apertures 112 and 114 , respectively.
- the interior surface of the first tubular structure 116 corresponds in cross-sectional dimension to the first aperture 112 and is shaped to receive the GPS antenna 14 and the interior surface of the second tubular structure 118 corresponds in cross-sectional dimension to the second aperture 114 and is shaped to receive the radio antenna 18 .
- the first tubular structure 116 includes an open top end 120 thereof. Positioned proximate the open top end 120 is a cap 122 .
- the cap 122 includes a body portion 124 sized and shaped to fit within the open top end 120 of the first plastic tubular structure 116 and a flange 126 .
- the flange 126 extends around the periphery of the body portion 124 and is of similar shape as the open top end 120 of the first tubular structure 116 . However, the flange 126 has greater peripheral dimensions than the open top end 120 such that when the cap 122 is positioned over the open top end 120 of the first tubular structure 116 , the body portion 124 thereof fits within the open top end 120 and the flange 126 is prevented from entering the open top end 120 . Thus, the cap 122 effectively seals the open top end 120 of the first tubular structure 116 .
- a flexible elastomeric cover 132 is positioned over the first tubular structure 116 .
- the flexible elastomeric cover 132 be provided as a single element having a body portion 134 , a first tubular portion 136 , a second tubular portion 138 and a connector portion 140 .
- the connector portion 140 extends between the first and second tubular portions 136 , 138 and provides structural integrity to the flexible elastomeric cover 132 .
- the first tubular portion 136 is sized and shaped to receive the first tubular structure 116 and the second tubular portion 138 is sized and shaped to receive the second tubular structure 118 .
- the first tubular portion 136 includes an annular protrusion 142 extending from an interior surface thereof, the inner diameter of annular protrusion 142 being sized slightly smaller than the exterior surface the first plastic tubular structure 116 .
- the annular protrusion 142 from the first tubular portion 136 bears against the exterior surface of the first tubular structure 116 , forming a flexible elastomeric ring that seals the first tubular structure 116 from the ingress of water.
- a similar flexible elastomeric seal is formed upon positioning the second tubular portion 138 over the second tubular structure 118 as well.
- the top end wall 96 of the second housing section 38 may include one or more additional integral tubular structures 144 defining one or more openings i 45 sized and shaped to receive a power indicator light, a power button, or the like.
- additional tubular structure 144 is shown, tubular structure 144 providing access to a power button or other switch element (not shown) accessible at the top thereof.
- a power button or other switch element not shown
- a seal may be effected between flexible elastomeric cover 132 and plastic tubular structure 144 in a manner similar to that described with respect to first plastic tubular structure 116 , e.g., through use of an annular protrusion on an interior portion of elastomeric cover 132 configured to fit over tubular structure 144 .
- an electrical connector comprising a number of connector pins 146 , e.g., brass connector pins.
- the connector pins 146 are configured to permit, for instance, downloading of additional cartographic data and the like through removable coupling with an external device (not shown).
- a cavity 148 in the exterior surface 150 of the rear wall 90 of the second housing section 38 i.e., the surface of the rear wall 90 which is visible from the backside of the GPS/radio unit 10 when the GPS/radio unit 10 is assembled).
- the bottom surface 152 of the cavity 148 includes at least one opening 154 therein, the number of openings corresponding to the number of connector pins 146 desired. Fitted into each opening 154 in an interference fit is a connector pin 146 . Alternatively, the connector pins 146 may be molded into the second housing section 38 . Each connector pin 146 is positioned such that a portion thereof extends into the internal compartment of the GPS/radio unit 10 and a portion thereof extends into the cavity 148 in the exterior surface 150 of the rear wall 90 . The interference fit of the connector pins 146 within openings 154 provides a certain degree of protection against ingress of water.
- a dot of RTV sealant may be applied at the location of the opening(s) 154 as discussed above with regard to the elongated slot 102 in the first side wall 92 .
- a cover 156 comprising a rubber or plastic plug
- the plug is primarily for aesthetics and may, incidentally, provide some protection for connector pins 146 against collection of debris and mechanical damage when the connector pins 146 are not coupled with an external device (not shown) and an adapter (not shown) for the external device (not shown) provides some protection when coupled with the connector pins 146 .
- the exterior surface 150 of the rear wall 90 also includes two elongated, parallel depressions 158 , 160 sized and shaped to receive a pair of batteries (not shown) for powering the GPS/radio unit 10 .
- a top protruding wall 162 and a bottom protruding wall 164 Positioned to correspond with the parallel depressions 158 , 160 is a top protruding wall 162 and a bottom protruding wall 164 to aid in holding the batteries (not shown) in place within the depressions 158 , 160 ( FIG. 10 ).
- At opposing longitudinal ends of each depression 158 , 160 is a pair of battery terminals 166 , 168 , each battery terminal 166 , 168 ( FIG. 14 ) having associated therewith a corresponding opening 170 , 172 ( FIGS.
- a dot of RTV sealant is applied at the locations of the openings 170 , 172 as discussed above with regard to the elongated slot 102 in the first side wall 92 .
- a battery cover 173 ( FIGS. 11 and 16 ) is positioned over the batteries and the top and bottom protruding walls 162 , 164 .
- Battery covers are known to those of ordinary skill in the art and, accordingly, the structure of the battery cover will not be further discussed herein.
- the rear wall 90 of the second housing section 38 includes a slot opening 174 therein surrounded by an annular ridge 175 , the slot opening 174 sized and shaped to receive a corresponding protrusion (not shown) on the battery cover 173 ( FIGS. 9 , 12 and 14 ).
- the protrusion (not shown) is inserted into the slot opening 174 and rotated about one-quarter turn (e.g., about 90 degrees). When rotated in this manner, the protrusion (not shown) is prohibited from disengaging the rear wall 90 of the second housing section 38 and, thus, the battery cover 173 is held in place.
- Such locking mechanisms are known to those of ordinary skill in the art and will not be further discussed herein.
- a bead of RTV sealant is applied at the location of the slot opening 174 as discussed above with regard to the elongated slot 102 in the first side wall 92 to form a resilient gasket upon curing.
- the first housing section 36 and the second housing section 38 are fitted together in a cooperatively mated relationship forming the internal compartment in which the internal electronic components of the GPS/radio unit 10 are enclosed.
- the first side wall 42 of the first housing section 36 is cooperatively mated with the first side wall 92 of the second housing section 38
- the second side wall 44 of the first housing section 36 is cooperatively mated with the second side wall 94 of the second housing section 38
- the bottom wall 46 of the first housing section 36 is cooperatively mated with the bottom end wall 95 of the second housing section 38
- the top wall 45 of the first housing section 36 is cooperatively mated with the top end wall 96 of the second housing section 38 .
- This cooperative mating of the first and second housing sections 36 , 38 is effected through contact of the elastomeric gasket 200 formed on the peripheral edge 202 of first housing section with polished flat comprising the surface of the peripheral edge 204 of the second housing section 38 . Compression of elastomeric gasket 200 , and specifically of seal bead 210 , creates a water tight seal along the line of contact around the periphery of the GPS/radio unit 10 and between first and second housing sections 36 , 38 .
- First housing section 36 is secured to second housing section 38 , and elastomeric gasket 200 compressed therebetween, by the use of six self-threading screws (not shown) extending through apertures 212 in second housing section 38 ( FIG.
- the flexible elastomeric cover 132 Prior to assembly of the first housing section 36 with the second housing section 38 , the flexible elastomeric cover 132 is positioned over the first, second and, optionally, third tubular structures 116 , 118 , 144 such that the first tubular structure 116 is received in the first tubular portion 136 of the flexible elastomeric cover 132 , the second tubular structure 118 is received in the second tubular portion 138 of the flexible elastomeric cover 132 , the third tubular structure 144 is appropriately aligned with flexible elastomeric cover 132 and the body portion 134 is received in the cavity 99 .
- Flexible cover 132 is secured to second housing section 38 using an RTV adhesive, which adhesive also acts as a sealant to further ensure a watertight seal.
- an optional gripping region 176 may be formed such that it extends over a portion of the exterior surface 150 of the rear wall 90 of the second housing section 38 , over a portion of the battery cover 173 , over a portion of the exterior surface 48 of the front wall 40 of the first housing section 36 , over a portion of the side walls 42 , 44 of the first housing section 36 and over a portion of the side walls 92 , 94 of the second housing section 38 as shown.
- the optional gripping region 176 may be formed, as previously noted, of an elastomer and may be secured to the first housing section 36 and the second housing section 38 as part of the molding thereof on those respective components. In the embodiment shown in FIGS.
- the material forming the gripping region 176 is received in a series of depressions 177 (best seen in FIG. 8 ) in the exterior surface 48 of the front wall 40 of the first housing section 36 , the exterior surface 150 of the rear wall 90 of the second housing section 38 , in the side walls 42 , 44 of the first housing section 36 and the side walls 92 , 94 of the second housing section 38 .
- the gripping region 176 is slightly recessed from the remainder of the portable, handheld GPS/radio unit 10 .
- the gripping region 176 may be flush with the remainder of the GPS/radio unit 10 or protrude therefrom and that such alternatives, as well as the complete omission of gripping region 176 , are contemplated to be within the scope of the present invention.
- the gripping region 176 may include a number of bumps or protrusions 178 extending outwardly therefrom to assist a user in grasping the GPS/radio unit 10 without slippage.
- the illustrated positioning of the user input 28 , control buttons 86 , 88 and “push to talk” button 100 is currently preferred as it permits ergonomic handling of the GPS/radio unit 10 and one-handed user operation.
- a user would grasp the GPS/radio unit 10 such that the exterior surface 150 of the rear wall 90 of the second housing section 38 and the battery cover 173 are adjacent the palm of the user's hand.
- the user's thumb would then be able to easily access and maneuver the user input 28 and the control buttons under elastomeric covers 86 , 88 while the user's fingers would be positioned proximate the “push to talk” button 100 located on the first side wall 92 of the second housing section 38 .
- the user's hand would be in contact with the each gripping region 176 of the GPS/radio unit 10 and slippage thereof would be diminished.
- the GPS/radio unit 110 of the present invention is capable of withstanding temporary immersion in water up to one meter deep. That is, ingress of water in quantities causing harmful effects to the internal electronic components of the GPS/radio unit 10 shall not be possible when the GPS/radio unit 10 is temporarily immersed in water up to one meter deep under standardized conditions of pressure and time, i.e., about 30 minutes. (The water depth is measured from the bottom of the GPS/radio unit 10 to the top surface of the water and assumes the GPS/radio unit 10 is in an upright orientation or service position.)
- GPS/radio unit 10 of the present invention has been disclosed herein in terms of an exemplary embodiment and variations thereof, those of ordinary skill in the art will recognize and appreciate that many other additions, deletions, and modifications of the disclosed embodiment may be effected without departing from the scope of the invention as hereinafter claimed. For instance, the positioning of the various control buttons, the type of user input utilized and the specific methods of waterproofing each delineated location of the GPS/radio unit 10 may be modified without departing from the scope hereof.
Abstract
A combined global positioning system receiver and two-way radio communications unit (GPS/radio unit) that is configured for wirelessly communicating with one or more other such units and that includes a substantially waterproof enclosure for protection of the electronic components contained therein is provided. The substantially waterproof enclosure includes first and second cooperatively mated housing sections which, when mated, form an internal compartment or chamber for enclosing electronic components of the GPS/radio unit. The waterproof enclosure may further include a cover positioned over a plurality of tubular structures which protrude from a top end wall of the second housing section. Also provided is a method of waterproofing a GPS/radio unit including a number of different techniques for waterproofing different features and elements of the enclosure.
Description
- The present application is a divisional of and claims priority benefit to copending U.S. patent application Ser. No. 10/960,185, filed Oct. 7, 2004, titled “WATERPROOF COMBINED GLOBAL POSITIONING SYSTEM RECEIVER AND TWO-WAY RADIO AND METHOD OF WATERPROOF ENCLOSURE FABRICATION,” which is a continuation-in-part of and claims priority benefit to U.S. patent application Ser. No. 10/337,024, filed Jan. 6, 2003, now U.S. Pat. No. 6,844,845, titled “WATERPROOF COMBINED GLOBAL POSITIONING SYSTEM RECEIVER AND TWO-WAY RADIO AND METHOD OF WATERPROOF ENCLOSURE FABRICATION.” The above-identified prior filed applications are incorporated herein by reference.
- 1. Field of Invention
- The present invention relates generally to a combined global positioning system receiver and radio unit. More specifically, the present invention relates to a combined global positioning system navigation unit and two-way radio communications unit that includes a substantially waterproof enclosure for protection of the electronic components contained therein, and method of fabrication of the substantially waterproof enclosure.
- 2. State of the Art
- A global positioning system (GPS) is an electronic satellite navigation system that permits a user of the system to determine his or her position with respect to the Earth. Global positioning may be accomplished through the use of a handheld GPS receiver device that detects and decodes signals from a number of satellites orbiting the Earth. The signals from each of these satellites indicate the position of the satellite and the time at which the signal was sent. To decode the satellite signals, known as spread spectrum signals, and thereby calculate the desired navigational data, a GPS receiver must first “find” or acquire the signals emitted from a minimum number of satellites. Once the receiver is “locked on” to the spread spectrum signals, continuous real-time calculation and monitoring of the user's global position and other navigational data (e.g., velocity of movement) may be performed.
- GPS receivers have clocks that are synchronized with clocks in each of the satellites to determine how long it takes the signals to travel from the satellites to the receiver. In this regard, GPS receivers require a highly accurate internal frequency reference in order to acquire the spread spectrum GPS satellite signals. Specifically, acquiring spread spectrum satellite signals from a sufficient number of satellites to perform calculations requires determining the frequency of oscillation of the crystal oscillator utilized in the GPS receiver.
- Once the GPS receiver has acquired and decoded signals from a minimum of three satellites, the GPS receiver can calculate the user's position (e.g., latitude and longitude) by geometric triangulation. Upon acquiring signals from a minimum of four satellites, the GPS receiver can also calculate the user's altitude. In addition, GPS receivers are able to calculate the user's speed and direction of travel by continuously updating the user's position. Accordingly, GPS receivers are highly valuable and widely used in navigational systems because of their ability to accurately compute the user's position on or near the Earth in real-time, even as the user is moving.
- In addition to the growing popularity and demand for GPS navigational devices, portable two-way radios continue to enjoy widespread popularity. In 1996, the Federal Communications Commission (FCC) established the Family Radio Service (FRS) so that families and other small groups could communicate with one another over very short distances (typically less than one mile) at no charge and without a FCC license. The FRS, which is one of the Citizens Band Radio Services, includes fourteen channels in the UHF 460 MHz band. There are a number of commercially available two-way radios that are designed for use with the FRS. The increasing use of both portable two-way radios and global positioning systems has led to proposals to incorporate GPS receivers into portable radio devices.
- The first combined portable GPS receiver and two-way radio unit that is capable of displaying the location of at least one other such unit (as well as its own location) was recently developed by Garmin International, Inc. of Olathe, Kans. and is described in U.S. Pat. No. 6,373,430 (hereinafter “the '430 patent”). The combined global positioning system receiver and two-way radio unit of the '430 patent is capable of communicating with one or more other such units over a wireless radio network, wherein each of the units is adapted to transmit over the network radio signals indicative of that unit's location. The GPS/radio unit includes a GPS receiver for receiving satellite signals from a plurality of satellites, a processor coupled with the GPS receiver for calculating the location of the GPS/radio unit as a function of the received satellite signals, and a radio receiver coupled with the processor for receiving the radio signals transmitted by the other units. The processor is adapted to identify the location of the other units based upon the received radio signals. The GPS/radio unit also includes a display for indicating its own location as well as the location of at least one of the other units. The disclosure of the '430 patent is hereby incorporated herein by this reference as if set forth in its entirety.
- The GPS/radio unit of the '430 patent includes a portable, handheld housing for housing the unit electronic components, e.g., the GPS receiver, the processor, the radio receiver and the display. However, the electronic components contained within the housing are vulnerable to potential harmful effects which may be caused by ingress of water (or other liquid) through the housing. Such ingress is of concern if the GPS/radio unit is dropped into a puddle, pond, river, stream or other body of water, if water or other liquid is splashed onto the GPS/radio unit, or if the user of the GPS/radio unit is caught in inclement weather such as rain or snow.
- Thus, the inventors have recognized that it would be advantageous to provide a combined two-way radio communications unit and GPS navigation unit configured for wirelessly communicating with one or more other such units and which includes a substantially waterproof enclosure for protecting the electronic components housed therein from the potentially harmful effects of liquid ingress. It would be further advantageous to provide such substantially waterproof enclosure in a compact, robust yet relatively inexpensive form, the components of which are easy to fabricate and assemble.
- The present invention includes a combined global positioning system receiver and two-way radio communications unit (GPS/radio unit) that includes a substantially waterproof enclosure for protection of the electronic components contained therein. The GPS/radio unit is configured for wirelessly communicating with at least one other such GPS/radio unit over a wireless radio network, the at least one other GPS/radio unit being configured for transmitting radio signals indicative of that unit's location. The GPS/radio unit includes a global positioning system receiver for receiving satellite signals from a plurality of satellites, a processor coupled with the global positioning system receiver for calculating the location of the GPS/radio unit as a function of the received satellite signals, and a radio transceiver coupled with the processor for receiving the radio signals transmitted by the at least one other GPS/radio unit and for transmitting a radio signal to the at least one other GPS/radio unit. The transmitted radio signal is indicative of a location of the GPS/radio unit. The processor is configured to identify the location of the at least one other GPS/radio unit based upon the received radio signals. The GPS/radio unit also includes a display for indicating the location of at least one of the other GPS/radio units and a substantially waterproof enclosure for housing the global positioning system receiver, the processor, the radio transceiver and the display.
- The present invention further encompasses a substantially waterproof enclosure for a combined global positioning system receiver and two-way radio communications unit (GPS/radio unit). The substantially waterproof enclosure includes a first housing section and a second housing section configured to cooperatively mate with one another in a watertight relationship. The waterproof enclosure may further include a cover configured to be positioned over a plurality of tubular structures which protrude upwardly from a top end wall of the second housing section. The cover includes a body portion which may be received in a cavity formed upon cooperatively coupling the first and second housing sections to one another.
- Still further, the present invention encompasses a method for fabricating a substantially waterproof enclosure for a combined global positioning system navigation unit and two-way radio communications unit (GPS/radio unit). The method comprises forming the first and second housing sections, preferably by molding. The first housing section is then subjected to a second molding operation wherein an elastomer may be selectively placed to provide elastomeric covers over apertures at locations of movable users input elements to be carried by the GPS/radio unit and to provide an elastomeric gasket along a peripheral edge of the first housing section to be placed and compressed against a cooperatively configured peripheral edge of the second housing section upon assembly of the two housing sections. The method further comprises disposing components of a GPS/radio unit that is configured for wirelessly communicating with at least one other such unit at least partially within an enclosure or section thereof having at least one opening through a wall thereof, and sealing the at least one opening to substantially prevent the ingress of water or other liquid through the at least one opening. The method further comprises placing an elastomeric cover over a portion of the enclosure in an interfering relationship with an outer wall thereof to form a substantially waterproof seal therewith. Additional and more specific aspects of providing waterproofing to different elements and features of the substantially waterproof enclosure, and of forming the housing sections of the waterproof enclosure, are also disclosed herein and encompassed by the present invention.
- The foregoing features and advantages of the invention will be apparent from the following description and apparent from the accompanying drawings, in which like reference characters refer to the same or similar parts throughout the different views. The drawings illustrate principles of the invention and, although not necessarily to scale, show relative dimensions.
-
FIG. 1 is a block diagram of the components of an exemplary combined global positioning system receiver and two-way communications unit (GPS/radio unit); -
FIG. 2 is a front perspective view of an exemplary, assembled GPS/radio unit in accordance with the present invention, which combined GPS/radio unit includes a waterproof enclosure for protection of the electronic components contained therein; -
FIG. 3 is a front elevational view of the GPS/radio unit ofFIG. 2 ; -
FIG. 4 is a front perspective view of the first housing section of a two section waterproof enclosure in accordance with the present invention; -
FIG. 5 is a rear perspective view of the first housing section ofFIG. 4 ,FIG. 5A is an enlarged elevation of the location thereon wherein a microphone is to be placed andFIG. 5B is an enlarged cross sectional view of a peripheral edge of a portion of the first housing section and an elastomeric gasket formed thereon; -
FIG. 6 is a side cross-sectional view taken along line 6-6 ofFIG. 3 ; -
FIG. 7 is a side cross-sectional view taken along line 7-7 ofFIG. 3 ; -
FIG. 8 is a rear perspective view of the second housing section of the two section waterproof enclosure in accordance with the present invention; -
FIG. 9 is a front perspective view of the second housing section ofFIG. 8 ; -
FIG. 10 is a right side elevational view of the second housing section ofFIG. 8 ; -
FIG. 11 is a rear elevational view of an exemplary assembled GPS/radio unit in accordance with the present invention; -
FIG. 12 is a front elevational view of the second housing section ofFIG. 8 ; -
FIG. 13 is a front perspective view of the second housing section ofFIG. 8 ; -
FIG. 14 is a rear elevational view of the second housing section ofFIG. 8 ; -
FIG. 15 is a cross-sectional view taken along line 15-15 ofFIG. 14 ; -
FIG. 16 is a right side elevational view of the assembled GPS/radio unit ofFIG. 2 ; and -
FIG. 17 is a left side elevational view of an assembled GPS/radio unit ofFIG. 2 . - The present invention is directed to a combined global positioning system receiver and two-way radio communications unit that is configured for wirelessly communicating with one or more other such units and that includes a waterproof enclosure for protection of the electronic components contained therein. The particular embodiments described herein are intended in all respects to be illustrative rather than restrictive. Additional embodiments will become apparent to those of ordinary skill in the art to which the present invention pertains without departing from its scope.
- Referring to the figures in general, and initially to
FIG. 1 in particular, a block diagram of the electronic components of an exemplary combined global positioning system and two-way radio communications unit (GPS/radio unit) is illustrated. The combined GPS/radio unit is denoted generally byreference numeral 10, and is sized and configured as a handheld unit. The GPS/radio unit 10 of the present invention is preferably capable of direct voice and data communications, such as the unit disclosed in U.S. Pat. No. 6,373,430, incorporated herein by specific reference. The GPS/radio unit 10 includes aGPS receiver 12, aGPS antenna 14, aradio transceiver 16 and aradio antenna 18. TheGPS receiver 12 andradio transceiver 16 are electronically coupled with aprocessor 20 that has an associatedmemory 22 for storing information such as cartographic data (e.g., electronic maps). The cartographic data may be stored on cartridges that can be removably attached and operably coupled to the unit. For example, an electronic map of a particular city or National Park may be stored in a single cartridge. Thememory 22 may also store historical location data for the GPS/radio unit 10 or for other units that have transmitted location data to theunit 10. - The combined GPS/
radio unit 10 also includes amicrophone 24, aspeaker 26, auser input 28 and adisplay 30. It is currently preferred that thedisplay 30 comprises a liquid crystal display (LCD). Further, it is currently preferred that theuser input 28 comprises a five-way cursor for accessing data and navigating within a menu-driven display program. However, it will be understood and appreciated by those of ordinary skill in the art that theuser input 28 may comprise an alphanumeric keypad, such as a telephone keypad, which may be used to select and input a name or other identifier for the unit using any combination of the letters, numbers, or symbols which are available on the keypad. Additionally, theuser input 28 may comprise a microphone/voice recognition input, touch screen, or anyother user input 28 known to those of ordinary skill in the art. All such variations are contemplated to be within the scope of the present invention. When the GPS/radio unit 10 is assembled, it is currently preferred that theuser input 28 is generally centrally located withinaperture 70 with respect to theexterior surface 48 of the front wall 40 (seeFIG. 4 ) of thefirst housing section 36 of the GPS/radio unit 10 to facilitate one-handed user operation, as more fully described below. - Referring now to
FIG. 2 , the GPS/radio unit 10 of the present invention includes a,waterproof enclosure 32 for housing the internal components thereof and protecting the same from the potential harmful effects of water ingress. As used herein, the term “water” encompasses and includes not only water per se, but also any other liquid, and is not limited to such substances in a liquid state but also in a vapor state. The illustratedwaterproof enclosure 32 includes a two-section plastic housing 34 and a flexibleelastomeric cover 132 positioned to cover an uppermost region of the two-section plastic housing 34, as more fully described below. The two-section plastic housing 34 is comprised of afirst housing section 36 and asecond housing section 38. When the GPS/radio unit 10 is assembled, the first andsecond housing sections GPS receiver 12, theprocessor 20, theradio transceiver 16, theradio antenna 18, theGPS antenna 14 and thedisplay 30, as illustrated inFIG. 1 ) may be enclosed and protected. Fabrication of the first andsecond housing sections radio unit 10 is more fully described below. - Referring to
FIGS. 4 and 5 , thefirst housing section 36 of the two-section plastic housing 34 is shown. Thefirst housing section 36 includes afront wall 40, first andsecond side walls top wall 45 and abottom wall 46. Anexterior surface 48 of thefront wall 40 is visible from the front of the GPS/radio unit 10 when the GPS/radio unit 10 is assembled. Aninterior surface 50 of thefront wall 40, theside walls top wall 45 and thebottom wall 46 forms aninterior cavity 52 within which a number of the internal electronic components of the GPS/radio unit 10 may be positioned. When cooperatively mated with thesecond housing section 38, as more fully described below, theinterior cavity 52 of thefirst housing section 36 and aninterior cavity 97 of thesecond housing section 38 cooperate with one another to form a substantially water tight internal compartment wherein the internal components of the GPS/radio unit 10 may be enclosed. - To elaborate on the fabrication of first and
second housing sections housing section second housing sections peripheral edge 202 offirst housing section 36 to form anelastomeric gasket 200 extending along theperipheral edge 202 offirst housing section 36 which will engage a cooperatively configuredperipheral edge 204 of second, or rear,housing section 38.Elastomeric gasket 200 may best be seen inFIGS. 4 , 5, and 5B. A currently preferred material forelastomeric gasket 200 is a styrenic thermoplastic elastomer. As shown in enlarged detail inFIG. 5B ,elastomeric gasket 200 is formed over, and in alignment with,peripheral edge 202, which includes a flat 206 and aprotrusion 208 extending therealong in the center ofperipheral edge 202.Elastomeric gasket 200 is formed with asmall seal bead 210 protruding upwardly therefrom.Seal bead 210 is compressed against, and seals with, a polished, flat surface comprisingperipheral edge 204 ofsecond housing section 38 upon assembly of the first andsecond housing sections - The second part of the molding operation may also be used to form elastomeric covers 86 and 88 over
apertures 85 infront housing section 36, the elastomeric covers 86 and 88 being adhered in place within the outward ends ofapertures 85 during the molding thereof. The second part of the molding operation forfirst housing section 36 may further be used to form a portion of optionalgripping region 176 which, as illustrated, may be contiguous withelastomeric gasket 200 or which may be discrete and separate therefrom. Likewise, another portion of optionalgripping region 176 may be formed onsecond housing section 38 in a second of a two part molding operation performed thereon. - The
top wall 45 of thefirst housing section 36 and the portion of eachside wall top wall 45 include a continuous, upwardly extendingridge 54 protruding therefrom. The upwardly extendingridge 54 is molded to be coextensive with theexterior surface 48 of thefront wall 40 and theside walls second housing section 38 also includes acontinuous ridge 93 extending upwardly from atop end wall 96 andside walls ridges cavity 99 depicted inFIGS. 5 and 9 ) in which thebody portion 134 of the flexibleelastomeric cover 132 which protects the GPS andradio antennas - As best seen in
FIG. 6 , one such component positioned within theinterior cavity 52 of thefirst housing section 36 is thedisplay 30. Thefront wall 40 of thefirst housing section 36 includes an opening 55 (FIG. 5 ) therein sized and shaped to enable viewing of thedisplay 30 therethrough, thedisplay 30 typically being slightly recessed from the plane of theexterior surface 48 of thefront wall 40. It is currently preferred that theopening 55 in thefront wall 40 and thedisplay 30 are positioned with respect to theexterior surface 48 of thefront wall 40 off center toward anupper region 56 thereof as shown. - Still referring to
FIG. 6 , a transparentplastic lens 58 is positioned over the surface of thedisplay 30 which is exposed through theopening 55 in thefront wall 40 proximate theexterior surface 48 thereof, as well as over theportion 57 of theexterior surface 48 of thefront wall 40 which surrounds thedisplay 30. The transparentplastic lens 58 includes a shape similar to that of thedisplay 30 and is slightly larger than thedisplay 30. That is, the transparentplastic lens 58 extends beyond thedisplay 30 around an outer periphery thereof and is secured to theportion 57 of theexterior surface 48 of thefront wall 40 which surrounds thedisplay 30 by a double-sidedadhesive element 53. Suitable adhesive elements include an acrylic foam sheet with adhesive on both sides and offered by 3M as product #4920, and a double-sided adhesive element 5000N offered by Nitto-Denko. In this manner, the periphery of the transparentplastic lens 58 forms a water tight seal with theexterior surface 48 of thefront wall 40, substantially preventing water from contacting thedisplay 30 and thus from entering the internal compartment of the GPS/radio unit 10 through thedisplay opening 55. - Also positioned within the
interior cavity 52 of thefirst housing section 36 are themicrophone 24 and the speaker 26 (seeFIG. 1 ) through which a user may communicate with users of other units. To facilitate use of thespeaker 26, thefront wall 40 of thefirst housing section 36 includes a number ofsmall openings 60 therethrough (FIGS. 4 and 5 ). It is currently preferred that thesmall openings 60 through thefront wall 40 are positioned off center toward alower region 62 thereof as shown, and thespeaker 26 correspondingly positioned within theinterior cavity 52. To prevent water from entering the internal compartment of the GPS/radio unit 10 through thesmall openings 60 in thefront wall 40, thecone 64 ofspeaker 26 is formed of a suitable waterproof material also well adapted to function as a speaker cone, such as MYLAR® polymer. A sealing element in the form of an 0-ring or gasket 66 (a foam gasket being currently preferred) is then adhered to anannular protrusion 59 on theinterior surface 50 of thefront wall 40 and a periphery of the cone ofspeaker 26, which is also mechanically clamped using, e.g., ametal clamp frame 68, to the protrusion 59 (seeFIG. 6 ). In this manner, themetal clamp frame 68 latches over the 0-ring orgasket 66, pressing against a periphery of the cone ofspeaker 26 and a water tight seal is formed using the material of thespeaker cone 64 as a water-impermeable membrane to prevent water from entering the internal compartment of the GPS/radio unit 10.Microphone 24 is mounted to the main printed circuit board (not shown) at a location to be positioned in alignment with, and to be received within, substantiallyannular skirt 220 on theinterior surface 50 offront wall 40 of first housing section 36 (seeFIGS. 5 and 5A ).Aperture 222 extends through the wall of front housing section withinannular skirt 220, and is covered with an air and sound permeable, and water impermeable,hydrophobic patch 224 in the form of a membrane comprising a nonwoven fabric such as, by way of example only, VERSAPORE™ V-5000R fabric from Gelman Sciences.Hydrophobic patch 224 is secured at its periphery overaperture 222 by asuitable adhesive 226 such as, by way of example only, a 3M product # 468 transfer adhesive. - Substantially centrally located with respect to the
front wall 40 of thefirst housing section 36 is at least one aperture 70 (FIGS. 4 and 5 ) through which at least one user input 28 (FIG. 6 ) protrudes toward theexterior surface 48 of thefront wall 40. In the illustrated embodiment, theuser input 28 comprises a five-way cursor for accessing data and navigating within a menu-driven display program. However, theuser input 28 may comprise an alphanumeric pad, microphone/voice recognition input, or the like, as known to those of ordinary skill in the art. The five-waycursor user input 28 illustrated enables navigation in four directions (generally up, down and to each side) by appropriately directed lateral pressure, a selection being made and communicated to theprocessor 20 by depression of theuser input 28. - Referring now to
FIGS. 5 and 6 , to prevent water from entering the internal compartment of the GPS/radio unit 10 through the at least one aperture 70 (FIG. 5 ), a flexible elastomeric cover 72 (FIG. 6 ) may be positioned over theuser input 28. The flexibleelastomeric cover 72 includes a cup-shapedbody portion 74 having a closedtop end 76 and an openbottom end 78, thebody portion 74 forming a cavity sized and shaped to receive theuser input 28. Extending about a periphery of the openbottom end 78 is aflange 80, theterminal end 82 of which is turned upwardly from the plane of theflange 80. Upon assembly, theuser input 28 is fitted into the cavity formed by thebody portion 74 and the upwardly turnedterminal end 82 of theflange 80 is fitted within a groove 84 (FIG. 5 ) protruding from theinterior surface 50front wall 40 in a resilient, compressed interference fit. In this manner, the flexibleelastomeric cover 72 forms a water tight seal with thefirst housing section 36, substantially preventing water from contacting theuser input 28 through theaperture 70 in thefront wall 40 and thereby preventing water from entering the internal compartment of the GPS/radio unit 10 through theaperture 70. - Optionally, the
front wall 40 of thefirst housing section 36 may include one or moreadditional apertures 85 through which one or more control buttons may protrude toward theexterior surface 48 of thefront wall 40. In the embodiment shown inFIG. 2 , the GPS/radio unit 10 includes two control buttons (not shown) protruding through thefront wall 40 of thefirst housing section 36 and covered byelastomeric covers elastomeric cover 86 may, for instance, be coupled with theprocessor 20 so that depressing the first control button causes the GPS/radio unit 10 to immediately transmit a radio signal over the network indicative of the location of the GPS/radio unit 10. Similarly, the second control button covered byelastomeric cover 88 may, for instance, be coupled with theprocessor 20 so that depressing the second control button causes the GPS/radio unit 10 to immediately transmit a radio signal over the network requesting that users of other units transmit their locations over the network. It will be understood and appreciated by those of ordinary skill in the art that the control buttons may have any number of additional or alternative functions including, but not limited to, power, volume adjustment and the like. - In order to protect the internal compartment of the GPS/
radio unit 10 from the ingress of water at the locations of theapertures 85 through which the control buttons may protrude, flexible elastomeric covers 86, 88 may be disposed over the control buttons in a manner similar to that described above with regard to theuser input 28 and the correspondingaperture 70 in thefront wall 40 of thefirst housing section 36. Alternatively, those portions of thehousing section 36 overlying the control buttons may be made thin-walled and flexible enough to permit depression of the control buttons. However, it is currently preferred, as noted above, that flexible elastomeric covers 86, 88 be molded ontofront housing section 36 in a second part of a two-part injection molding operation used to formfront housing section 36. - Referring now to
FIGS. 9 and 113 , front perspective views of thesecond housing section 38 of the two-section plastic housing 34 are shown, thefirst housing section 36 and electronic components being removed from the GPS/radio unit 10. Thesecond housing section 38 is preferably formed as a single molded component and includes arear wall 90, first andsecond side walls bottom end wall 95 and atop end wall 96. The top andbottom end walls second side walls interior cavity 97 within which a number of the internal electronic components of the GPS/radio unit 10 may be positioned. - The
top end wall 96 of thesecond housing section 38 and the portion of eachside wall top end wall 96 include an upwardly extending ridge 93 (FIG. 9 ) protruding therefrom. The upwardly extendingridge 93 is molded to be coextensive with theexterior surface 150 of therear wall 90 of thesecond housing section 38 and theside walls ridge 93 of thesecond housing section 38 cooperates with the upwardly extendingridge 54 of thetop wall 45 of thefirst housing section 36 to form a cavity 99 (portions ofcavity 99 illustrated inFIGS. 5 and 9 ) in which thebody portion 134 of the flexibleelastomeric cover 132 may be received. - The
first side wall 92 includes an extendedportion 98 thereof. As best seen inFIG. 17 , theextended portion 98 includes a control button 100 (or “push to talk” button) externally facing therefrom which may be depressed by the user when he or she desires to communicate with the user of another unit. Positioned to correspond with thecontrol button 100 is anelongated slot 102 through the first side wall 92 (FIGS. 9 and 13 ). Upon assembly, aflex circuit 103 extends from thecontrol button 100 through theelongated slot 102 and into theinterior cavity 97. To prevent water from entering theinterior cavity 97 and thus the internal compartment of the GPS/radio unit 10 through theelongated slot 102, a bead of room temperature vulcanizing (RTV) sealant is applied at the location of theelongated slot 102. The RTV sealant is typically applied in a viscous liquid or gel-like state and cures at room temperature, creating a flexible elastomeric seal at the point of application. Thus, once the applied RTV sealant cures, a water tight seal is formed about theflex circuit 103 as it passes through theelongated slot 102, preventing water from passing therethrough. - With reference to
FIG. 13 , thesecond side wall 94 of thesecond housing section 38 includes anaperture 104 therein which is positioned to correspond with anaudio jack 106 secured in ajack compartment 107 to therear wall 90 of thesecond housing section 38. If desired, an audio component (not shown), e.g., a headset, may be operably coupled with the GPS/radio unit 10 by insertion of a male plug adapter thereof through theaperture 104 in thesecond side wall 94. As best seen inFIG. 16 , acover 108 including a flexible elastomeric plug for insertion into theaperture 104 may be positioned over theaperture 104 when theaudio jack 106 is not in use. When a user desires to utilize theaudio jack 106, he or she may simply remove the elastomeric plug from theaperture 104 and insert the male plug adapter provided by the audio component (not shown). - An opening 110 (
FIG. 13 ) in the wall ofjack compartment 107 permits communication between theaudio jack 106 and the processor 20 (e.g., one or more wires may extend therethrough). While thecover 108 and/or the male plug adapter provided by the audio component (not shown) provide a certain amount of protection from water ingress throughaperture 104, to ensure that water may not leak beyond theaudio jack 106 through theopening 110 in the wall of thejack compartment 107 and damage the internal components of the GPS/radio unit 10, a dot of RTV sealant is applied at the location of theopening 110 as discussed above with regard to theelongated slot 102 in thefirst side wall 92. - As best seen in
FIG. 13 , thetop end wall 96 of thesecond housing section 38 includes at least twoapertures first aperture 112 having a cross-sectional dimension (e.g., diameter if the apertures are round) greater than the cross-sectional dimension of thesecond aperture 114. Extending from anexternal surface 115 of thetop end wall 96 and positioned to correspond with theapertures tubular structures tubular structures interior cavity 97 of the GPS/radio unit 10 through theapertures tubular structure 116 corresponds in cross-sectional dimension to thefirst aperture 112 and is shaped to receive theGPS antenna 14 and the interior surface of the secondtubular structure 118 corresponds in cross-sectional dimension to thesecond aperture 114 and is shaped to receive theradio antenna 18. - Referring now to
FIG. 7 , a cross-sectional view of the firsttubular structure 116, taken along line 7-7 ofFIG. 3 , is illustrated. It will be understood and appreciated by those of ordinary skill in the art that, while not depicted, the details depicted inFIG. 7 are equally applicable to the secondtubular structure 118 as well. The firsttubular structure 116 includes an opentop end 120 thereof. Positioned proximate the opentop end 120 is acap 122. Thecap 122 includes abody portion 124 sized and shaped to fit within the opentop end 120 of the first plastictubular structure 116 and aflange 126. Theflange 126 extends around the periphery of thebody portion 124 and is of similar shape as the opentop end 120 of the firsttubular structure 116. However, theflange 126 has greater peripheral dimensions than the opentop end 120 such that when thecap 122 is positioned over the opentop end 120 of the firsttubular structure 116, thebody portion 124 thereof fits within the opentop end 120 and theflange 126 is prevented from entering the opentop end 120. Thus, thecap 122 effectively seals the opentop end 120 of the firsttubular structure 116. - To prevent the ingress of water into the internal compartment of the GPS/
radio unit 10 through the firsttubular structure 116, a flexibleelastomeric cover 132 is positioned over the firsttubular structure 116. As best seen inFIG. 2 , it is currently preferred that the flexibleelastomeric cover 132 be provided as a single element having abody portion 134, a firsttubular portion 136, a secondtubular portion 138 and aconnector portion 140. Theconnector portion 140 extends between the first and secondtubular portions elastomeric cover 132. The firsttubular portion 136 is sized and shaped to receive the firsttubular structure 116 and the secondtubular portion 138 is sized and shaped to receive the secondtubular structure 118. - Referring again to
FIG. 7 , the firsttubular portion 136 includes anannular protrusion 142 extending from an interior surface thereof, the inner diameter ofannular protrusion 142 being sized slightly smaller than the exterior surface the first plastictubular structure 116. Thus, when the firsttubular portion 136 is positioned over the firsttubular structure 116, theannular protrusion 142 from the firsttubular portion 136 bears against the exterior surface of the firsttubular structure 116, forming a flexible elastomeric ring that seals the firsttubular structure 116 from the ingress of water. It will be understood by those of ordinary skill in the art that, while not depicted in the drawing figures, a similar flexible elastomeric seal is formed upon positioning the secondtubular portion 138 over the secondtubular structure 118 as well. - Optionally, the
top end wall 96 of thesecond housing section 38 may include one or more additional integraltubular structures 144 defining one or more openings i45 sized and shaped to receive a power indicator light, a power button, or the like. In the embodiment illustrated inFIG. 13 , one such additionaltubular structure 144 is shown,tubular structure 144 providing access to a power button or other switch element (not shown) accessible at the top thereof. It will be understood by those of ordinary skill in the art that there would also be a corresponding flexible segment 147 (FIG. 2 ) molded in thebody portion 134 of the flexibleelastomeric cover 132 permitting necessary, tactile access to the indicator button or other switch element. A seal may be effected between flexibleelastomeric cover 132 and plastictubular structure 144 in a manner similar to that described with respect to first plastictubular structure 116, e.g., through use of an annular protrusion on an interior portion ofelastomeric cover 132 configured to fit overtubular structure 144. - Referring now to
FIGS. 9 and 14 , also positioned on therear wall 90 of thesecond housing section 38 is an electrical connector comprising a number of connector pins 146, e.g., brass connector pins. The connector pins 146 are configured to permit, for instance, downloading of additional cartographic data and the like through removable coupling with an external device (not shown). As best seen inFIGS. 8 and 15 , positioned to correspond with the connector pins 146 is acavity 148 in theexterior surface 150 of therear wall 90 of the second housing section 38 (i.e., the surface of therear wall 90 which is visible from the backside of the GPS/radio unit 10 when the GPS/radio unit 10 is assembled). Thebottom surface 152 of thecavity 148 includes at least oneopening 154 therein, the number of openings corresponding to the number of connector pins 146 desired. Fitted into each opening 154 in an interference fit is aconnector pin 146. Alternatively, the connector pins 146 may be molded into thesecond housing section 38. Eachconnector pin 146 is positioned such that a portion thereof extends into the internal compartment of the GPS/radio unit 10 and a portion thereof extends into thecavity 148 in theexterior surface 150 of therear wall 90. The interference fit of the connector pins 146 withinopenings 154 provides a certain degree of protection against ingress of water. However, to further ensure that water may not enter the internal compartment of the GPS/radio unit 10 through the opening(s) 154, a dot of RTV sealant may be applied at the location of the opening(s) 154 as discussed above with regard to theelongated slot 102 in thefirst side wall 92. - As best seen in
FIG. 11 , when the connector pins 146 are not coupled with an external device (not shown), acover 156 comprising a rubber or plastic plug) may be placed within thecavity 148 in theexterior surface 150 of therear wall 90. The plug is primarily for aesthetics and may, incidentally, provide some protection for connector pins 146 against collection of debris and mechanical damage when the connector pins 146 are not coupled with an external device (not shown) and an adapter (not shown) for the external device (not shown) provides some protection when coupled with the connector pins 146. Referring now toFIGS. 8 and 14 , theexterior surface 150 of therear wall 90 also includes two elongated,parallel depressions radio unit 10. Positioned to correspond with theparallel depressions wall 162 and abottom protruding wall 164 to aid in holding the batteries (not shown) in place within thedepressions 158, 160 (FIG. 10 ). At opposing longitudinal ends of eachdepression battery terminals battery terminal 166, 168 (FIG. 14 ) having associated therewith acorresponding opening 170, 172 (FIGS. 9 and 12 ) into the internal compartment of the GPS/radio unit 10. To ensure that water may not enter the internal compartment through thebattery terminal openings openings elongated slot 102 in thefirst side wall 92. - Once the batteries (not shown) are positioned within the
parallel depressions FIGS. 11 and 16 ) is positioned over the batteries and the top andbottom protruding walls battery cover 173 in place, therear wall 90 of thesecond housing section 38 includes aslot opening 174 therein surrounded by anannular ridge 175, theslot opening 174 sized and shaped to receive a corresponding protrusion (not shown) on the battery cover 173 (FIGS. 9 , 12 and 14). To secure thebattery cover 173 in place, the protrusion (not shown) is inserted into theslot opening 174 and rotated about one-quarter turn (e.g., about 90 degrees). When rotated in this manner, the protrusion (not shown) is prohibited from disengaging therear wall 90 of thesecond housing section 38 and, thus, thebattery cover 173 is held in place. Such locking mechanisms are known to those of ordinary skill in the art and will not be further discussed herein. - To prevent water from entering the internal compartment of the GPS/
radio unit 10 through theslot opening 174, a bead of RTV sealant is applied at the location of theslot opening 174 as discussed above with regard to theelongated slot 102 in thefirst side wall 92 to form a resilient gasket upon curing. - To assemble the waterproof GPS/
radio unit 10 of the present invention, thefirst housing section 36 and thesecond housing section 38 are fitted together in a cooperatively mated relationship forming the internal compartment in which the internal electronic components of the GPS/radio unit 10 are enclosed. Thefirst side wall 42 of thefirst housing section 36 is cooperatively mated with thefirst side wall 92 of thesecond housing section 38, thesecond side wall 44 of thefirst housing section 36 is cooperatively mated with thesecond side wall 94 of thesecond housing section 38, thebottom wall 46 of thefirst housing section 36 is cooperatively mated with thebottom end wall 95 of thesecond housing section 38 and thetop wall 45 of thefirst housing section 36 is cooperatively mated with thetop end wall 96 of thesecond housing section 38. This cooperative mating of the first andsecond housing sections elastomeric gasket 200 formed on theperipheral edge 202 of first housing section with polished flat comprising the surface of theperipheral edge 204 of thesecond housing section 38. Compression ofelastomeric gasket 200, and specifically ofseal bead 210, creates a water tight seal along the line of contact around the periphery of the GPS/radio unit 10 and between first andsecond housing sections First housing section 36 is secured tosecond housing section 38, andelastomeric gasket 200 compressed therebetween, by the use of six self-threading screws (not shown) extending throughapertures 212 in second housing section 38 (FIG. 14 ) and into mutually alignedapertures 214 inbosses 216 infront housing section 36. When mated in this manner, the upwardly extendingridge 54 of thefirst housing section 36 and the upwardly extendingridge 93 of thesecond housing section 38 cooperate to form acavity 99 into which thebody portion 134 of the flexibleelastomeric cover 132 is received. - Prior to assembly of the
first housing section 36 with thesecond housing section 38, the flexibleelastomeric cover 132 is positioned over the first, second and, optionally, thirdtubular structures tubular structure 116 is received in the firsttubular portion 136 of the flexibleelastomeric cover 132, the secondtubular structure 118 is received in the secondtubular portion 138 of the flexibleelastomeric cover 132, the thirdtubular structure 144 is appropriately aligned with flexibleelastomeric cover 132 and thebody portion 134 is received in thecavity 99.Flexible cover 132 is secured tosecond housing section 38 using an RTV adhesive, which adhesive also acts as a sealant to further ensure a watertight seal. - As seen in
FIGS. 2 , 16 and 17 and as previously described, an optionalgripping region 176 may be formed such that it extends over a portion of theexterior surface 150 of therear wall 90 of thesecond housing section 38, over a portion of thebattery cover 173, over a portion of theexterior surface 48 of thefront wall 40 of thefirst housing section 36, over a portion of theside walls first housing section 36 and over a portion of theside walls second housing section 38 as shown. The optionalgripping region 176 may be formed, as previously noted, of an elastomer and may be secured to thefirst housing section 36 and thesecond housing section 38 as part of the molding thereof on those respective components. In the embodiment shown inFIGS. 2 , 16 and 17, the material forming thegripping region 176 is received in a series of depressions 177 (best seen inFIG. 8 ) in theexterior surface 48 of thefront wall 40 of thefirst housing section 36, theexterior surface 150 of therear wall 90 of thesecond housing section 38, in theside walls first housing section 36 and theside walls second housing section 38. In this embodiment, thegripping region 176 is slightly recessed from the remainder of the portable, handheld GPS/radio unit 10. It will be understood and appreciated by those of ordinary skill in the art that thegripping region 176 may be flush with the remainder of the GPS/radio unit 10 or protrude therefrom and that such alternatives, as well as the complete omission ofgripping region 176, are contemplated to be within the scope of the present invention. Thegripping region 176 may include a number of bumps orprotrusions 178 extending outwardly therefrom to assist a user in grasping the GPS/radio unit 10 without slippage. - The illustrated positioning of the
user input 28,control buttons button 100 is currently preferred as it permits ergonomic handling of the GPS/radio unit 10 and one-handed user operation. For example, in use, a user would grasp the GPS/radio unit 10 such that theexterior surface 150 of therear wall 90 of thesecond housing section 38 and thebattery cover 173 are adjacent the palm of the user's hand. The user's thumb would then be able to easily access and maneuver theuser input 28 and the control buttons under elastomeric covers 86, 88 while the user's fingers would be positioned proximate the “push to talk”button 100 located on thefirst side wall 92 of thesecond housing section 38. Additionally, the user's hand would be in contact with the eachgripping region 176 of the GPS/radio unit 10 and slippage thereof would be diminished. - When assembled as provided herein, the GPS/
radio unit 110 of the present invention is capable of withstanding temporary immersion in water up to one meter deep. That is, ingress of water in quantities causing harmful effects to the internal electronic components of the GPS/radio unit 10 shall not be possible when the GPS/radio unit 10 is temporarily immersed in water up to one meter deep under standardized conditions of pressure and time, i.e., about 30 minutes. (The water depth is measured from the bottom of the GPS/radio unit 10 to the top surface of the water and assumes the GPS/radio unit 10 is in an upright orientation or service position.) - While the GPS/
radio unit 10 of the present invention has been disclosed herein in terms of an exemplary embodiment and variations thereof, those of ordinary skill in the art will recognize and appreciate that many other additions, deletions, and modifications of the disclosed embodiment may be effected without departing from the scope of the invention as hereinafter claimed. For instance, the positioning of the various control buttons, the type of user input utilized and the specific methods of waterproofing each delineated location of the GPS/radio unit 10 may be modified without departing from the scope hereof.
Claims (18)
1. A first waterproof combined global positioning system navigation unit and two-way radio communications unit (GPS/radio unit) configured for wirelessly communicating with a second GPS/radio unit, the second GPS/radio unit being configured to transmit radio signals indicative of the second GPS/radio unit's location, the first GPS/radio unit comprising:
a global positioning system receiver for receiving satellite signals from a plurality of satellites;
a processor coupled with the global positioning system receiver for calculating the location of the first GPS/radio unit as a function of the received satellite signals;
a radio transceiver coupled with the processor for directly transmitting and receiving voice and data communications to and from the second GPS/radio unit, wherein the transmitted data communications is indicative of a location of the first GPS/radio unit, and wherein the processor is configured to identify the location of the second GPS/radio unit based upon the received data communications;
a display coupled with the processor for indicating the location of the second GPS/radio unit; and
a waterproof housing enclosing the global positioning system receiver, the processor, the radio transceiver, and the display.
2. The waterproof GPS/radio unit of claim 1 , wherein the waterproof housing comprises:
a first housing section; and
a second housing section cooperatively coupled with the first housing section to create a watertight seal therewith.
3. The waterproof GPS/radio unit of claim 2 , wherein the first housing section includes a peripheral edge carrying a continuous elastomeric gasket thereon, the second housing section includes a peripheral edge against which the continuous elastomeric gasket is compressed.
4. The waterproof GPS/radio unit of claim 3 , wherein the continuous elastomeric gasket includes a continuous seal bead protruding from a face thereof, the peripheral edge of the second housing section comprises a polished flat and the continuous seal bead is compressed against the polished flat.
5. The waterproof GPS/radio unit of claim 2 , wherein—
the housing sections each include a top wall, a first side wall, and a second side wall,
first and second tubular structures protrude upwardly from at least one of the top walls, and
a ridge extends upwardly from the top, first, and second side walls to create a cavity when the first and second housing sections are cooperatively coupled.
6. The waterproof GPS/radio unit of claim 5 , wherein the waterproof housing further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure and at least a portion of the body portion of the cover is received in the cavity.
7. The waterproof GPS/radio unit of claim 6 , wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
8. The waterproof GPS/radio unit of claim 2 , wherein at least one of the first and 30 second housing sections includes at least one opening therein, and wherein the at least one opening is sealed to substantially prevent the ingress of water therethrough.
9. A waterproof housing for a first combined global positioning system navigation unit and two-way voice and data radio communications unit (GPS/radio unit) capable of directly wirelessly communicating with a second GPS/radio unit, the second GPS/radio unit being configured to transmit radio signals indicative of the second GPS/radio unit's location, the waterproof housing comprising:
a first housing section;
a second housing section cooperatively coupled with the first housing section to create a watertight seal therewith; and
wherein enclosed within the housing and thereby protected by the seal are—
a global positioning system receiver for receiving satellite signals from a plurality of satellites,
a processor coupled with the global positioning system receiver for calculating the location of the first GPS/radio unit as a function of the received satellite signals,
a radio transceiver coupled with the processor for directly transmitting and receiving voice and data communications to and from the second GPS/radio unit, wherein the transmitted data communications is indicative of a location of the first GPS/radio unit, and wherein the processor is configured to identify the location of the second GPS/radio unit based upon the received data communications, and
a display coupled with the processor for indicating the location of the second GPS/radio unit.
10. The waterproof housing of claim 9 , wherein the first housing section includes a peripheral edge carrying a continuous elastomeric gasket thereon, the second housing section includes a peripheral edge against which the continuous elastomeric gasket is compressed.
11. The waterproof housing of claim 10 , wherein the continuous elastomeric gasket includes a continuous seal bead protruding from a face thereof, the peripheral edge of the second housing section comprises a polished flat and the continuous seal bead is compressed against the polished flat.
12. The waterproof housing of claim 9 , wherein—
the housing sections each include a top wall, a first side wall, and a second side wall,
first and second tubular structures protrude upwardly from at least one of the top walls, and
a ridge extends upwardly from the top, first, and second side walls to create a cavity when the first and second housing sections are cooperatively coupled.
13. The waterproof housing of claim 12 , wherein the waterproof housing further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure and at least a portion of the body portion of the cover is received in the cavity.
14. The waterproof housing of claim 13 , wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
15. A waterproof housing for a first combined global positioning system navigation unit and two-way voice and data radio communications unit (GPS/radio unit) capable of directly wirelessly communicating with a second GPS/radio unit, the second GPS/radio unit being configured to transmit radio signals indicative of the second GPS/radio unit's location, the waterproof housing comprising:
a first housing section including a peripheral edge carrying a continuous elastomeric gasket thereon, the continuous elastomeric gasket including a continuous seal bead protruding from a face thereof;
a second housing section cooperatively coupled with the first housing section to create a watertight seal therewith, the second housing section including a peripheral edge and a polished flat against which the continuous seal bead is compressed; and
wherein enclosed within the housing and thereby protected by the seal are—
a global positioning system receiver for receiving satellite signals from a plurality of satellites,
a processor coupled with the global positioning system receiver for calculating the location of the first GPS/radio unit as a function of the received satellite signals,
a radio transceiver coupled with the processor for directly transmitting and receiving voice and data communications to and from the second GPS/radio unit, wherein the transmitted data communications is indicative of a location of the first GPS/radio unit, and wherein the processor is configured to identify the location of the second GPS/radio unit based upon the received data communications, and
a display coupled with the processor for indicating the location of the second GPS/radio unit.
16. The waterproof housing of claim 15 , wherein—
the housing sections each include a top wall, a first side wall, and a second side wall,
first and second tubular structures protrude upwardly from at least one of the top walls, and
a ridge extends upwardly from the top, first, and second side walls to create a cavity when the first and second housing sections are cooperatively coupled.
17. The waterproof housing of claim 15 , wherein the waterproof housing further comprises a cover having a body portion and at least first and second tubular cover portions, wherein the first tubular cover portion covers the first tubular structure, the second tubular cover portion covers the second tubular structure and at least a portion of the body portion of the cover is received in the cavity.
18. The waterproof housing of claim 17 , wherein each of the at least first and second cover tubular portions includes an annular protrusion on an interior thereof sized to compressibly contact an exterior surface of a tubular structure covered thereby.
Priority Applications (1)
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US11/870,717 US20080174478A1 (en) | 2003-01-06 | 2007-10-11 | Waterproof combined global positioning receiver and two-way radio and method of waterproof enclosure fabrication |
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US10/337,024 US6844845B1 (en) | 2003-01-06 | 2003-01-06 | Waterproof combined global positioning system receiver and two-way radio and method of waterproof enclosure fabrication |
US10/960,185 US7298320B1 (en) | 2003-01-06 | 2004-10-07 | Waterproof combined global positioning system receiver and two-way radio and method of waterproof enclosure fabrication |
US11/870,717 US20080174478A1 (en) | 2003-01-06 | 2007-10-11 | Waterproof combined global positioning receiver and two-way radio and method of waterproof enclosure fabrication |
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US10/960,185 Division US7298320B1 (en) | 2003-01-06 | 2004-10-07 | Waterproof combined global positioning system receiver and two-way radio and method of waterproof enclosure fabrication |
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US10/960,185 Expired - Lifetime US7298320B1 (en) | 2003-01-06 | 2004-10-07 | Waterproof combined global positioning system receiver and two-way radio and method of waterproof enclosure fabrication |
US11/870,717 Abandoned US20080174478A1 (en) | 2003-01-06 | 2007-10-11 | Waterproof combined global positioning receiver and two-way radio and method of waterproof enclosure fabrication |
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US10/960,185 Expired - Lifetime US7298320B1 (en) | 2003-01-06 | 2004-10-07 | Waterproof combined global positioning system receiver and two-way radio and method of waterproof enclosure fabrication |
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US7298320B1 (en) | 2007-11-20 |
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