CA2067165A1 - Universal ski boot heater - Google Patents
Universal ski boot heaterInfo
- Publication number
- CA2067165A1 CA2067165A1 CA002067165A CA2067165A CA2067165A1 CA 2067165 A1 CA2067165 A1 CA 2067165A1 CA 002067165 A CA002067165 A CA 002067165A CA 2067165 A CA2067165 A CA 2067165A CA 2067165 A1 CA2067165 A1 CA 2067165A1
- Authority
- CA
- Canada
- Prior art keywords
- boot
- anchor
- contact
- mechanical connection
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/34—Footwear characterised by the shape or the use with electrical or electronic arrangements
- A43B3/35—Footwear characterised by the shape or the use with electrical or electronic arrangements with electric heating arrangements
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/34—Footwear characterised by the shape or the use with electrical or electronic arrangements
Abstract
The present invention comprises a universal ski boot heating system, including a boot assembly (10) and a power pack assembly (38). The boot assembly (10) employs a heating element (12) disposable in a ski boot (14) and electrically connected to a boot anchor (24) secured to the exterior of the boot. The power pack assembly (38) includes an electrical energy source (44) and means for engaging the boot anchor (24) to permit selective contact between the energy source (44) and the heating element (12) through rotation of the power pack assembly (38) when engaged with the boot anchor (24).
Description
WO9~ 9(~ PC~ (J0/0~/71 DESCRIPTION
UNIVERSAL SKI BOOT HEATER
TECHNIC~L FIELD
The present invention relates generally to electrical heating systems for footwear, and specifically to a universal heating system adaptable to ski boots o any design and manufacture.
BACKGROUND ART
Cold, and specifically cold feett has been a major iimiting factor in the ability of the outdoor sportsman to appreciate and enjoy winter sports. As technology has improved throughout the years, fleece-lined leather boots have given way to footwear constructed using various I synthetic shell materials and foam, ThinsulateTM and other insulations. This improved winter footwear has benefited skiers, who now enjoy a variety of rigid boot shell designs insulated with the aforementioned materials. However, since downhill or alpine skiers spend extended periods of time outdoors, two major problems still inhibit foot warmth, one being a function of the nature of the sport and the second of advances in boot technology. The first phenomenon referred to above involves the long periods of relative inactivity while skiing, attributable to lift lines and long lift rides, the latter on chair lift chairs which inhibit blood circulation to the lower extremities. The second phenomenon is associated with boot technology advances in the areas of foot retention and responsiveness of the boot and attached ski to body movement. ~ven though .: . ' ~ , ' ~ --WO91/05~90 Pcr/~s~ 7,I
c~06r~ 2-many different lasts are available for ski boo- inn~r shells, ana custom lasts are relatively inexpensive for the benefit gained, many skiers tighten their boots to an extraordinary degree to give bet~er ski conrro' and feedback from the ski through the foot, ankle and calf regions of the leg. This tightness constricts the foot and ankle regions, restricting blood flow thereto and contributing to cold feet.
Ski racers, like other skiers, experience the above-mentioned problems. However, the adverse consequences of cold feet to their performance is even more dramatic at high racing speeds where the ~feel" of the skis ana terrain is all-important to promote optimum times and avert catastrophic injury.
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Since completely insulated ski boot structures would be massive and unwieldy, many efforts have been made to artificially provide heat, generally electrical, to the feet. For example, U.S. Patent No. 4,080,971 discloses a calf-mounted battery pack having a wire extending to a footwear insole incorporating a resistance heating element. This device is obviously inappropriate for skiing, as the bumps and shocks encountered as well as calf flexing would cause the battery pack to slip down the leg in short order. U.S. Patent No. 4,837,494 discloses a ski-mounted battery pack-including a wheel-type generator for battery recharging, the battery pack providing power to a resistance element in a ski boot through a connecting cable. The battery pack and generator weigh down and unbalance the ski, and the presence of cable connectors is a safety hazard to proper binding operation and to a total boot from ski release.
Several designs have been proposed for incorporating batteries in the ski boot structure itself. U.S. Patent ., , . , : .
~: , .: .
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' . , .
' WO 91/0~490 P~: r/~s(~ 577l 2~7~
Nos. 3,977,093 and 4,507,877 eacn disclose bat.eries housed in boot or shoe soles, powering resistance hea'er type insoles. These designs render it virtuall~
impossible to remove and replace batteries during a dav of skiing, and additionally require sDecialized footwear designs having battery cavities. Additionally, the on/off switch of the '093 patent is inside the boo~ and activated by the heel of the wearer, preventing its being turned off. The '877 switch is on the exterior of the boot, and thus susceptible to water incursion and icing problems, as well as impact damage from skier falls.
.S. Patent No. 4,798,933 discloses another design, one of the type commonly seen in commercially available heated ski boots today. This design uses a molded cavity in a bulge on the back of the ski boots to accommodate batteries, but there is no access to remove same except from the inside of the boot after the inner bladder or soft shell is removed. Again, as with the designs previously mentioned, the on/off switch is on the exterior of the boot.
U.S. Patent Nos. 4,697,359 and 4,780,968 disclose several variations of a ski boot design with integral heater, wherein a plug-in type battery pack is housed in cavities or apertures which can be located on the back, instep or top front of the boot. The '359 patent discloses a battery pack having only contacts for plugging into the bOotr the switch for turning the current on or off being included in the boot structure. The '968 embodiment includes the switch in the battery pack. The disadvantage of the foregoing designs resides in the necessity of special boot shells to accommodate the battery packs, and of fragile swi~ches susceptible to icing as the boots become wet and then freeze during wear.
, ~., .~ , . .
' ~ .
WO91/U~q~ PCI/US9~J/~5771 ~ 2~671~5 -4_ A more versatile boo~ heater design is disclosed in U.S.
Patent Nos. 3,859,496 and 3,946,193, wherein a battery case is mounted on the heel or back of a ski boot having a metal mounting plate thereon, and the heater is turned on and off by moving the battery pack up and down on the mounting plate on rails between an on and an off position. While this design is usable on any ski boot to which a mounting plate has been affixed, the use of electrical contacts on the exterior of the battery pack can result in shorts from water on the mounting plate or battery pack, and the boot wearer has to ascertain whether the heater is on or off by experimentally sliding the packs up or down on the plates, waiting to see if his feet get warm, or having a companion switch to turn the device on or off or observe which position the pack is in on the plate. Moreover, the mounting plate is itself mounted on a bracket secured to the ski boot, leaving the wires to the contacts exposed to the weather as well as build up of water, snow and ice, which accelerates deterioration thereof. Finally, the heiating element is electrically connected to the mounting plate contacts via screws accessible only from the boot interior, making easy removal of the insole or boot liner impossible.
In short, the boot heaters of the prior art suffer from either reliability problems, operational problems, or manufacturing complexities which render them all inadequate in solving the problem of cold feet in an economical, reliable manner.
DISCLOSURE OF INVENTION
In contrast to the prior art, the ski boot heating system of the present invention provides reliability and simplicity as well as economic design.
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' .
~91/0~9~ pGr/
-5- 2 ~ ~7 1 ~a The ski boo~ heating system of the present inventio, comprises a boot assembly and a power pacY assembly.
The boot assembly includes a heating element in the form of a flexible circuit substrate having an electrical resistance circuit thereon which extends from the top front of the boot insole, around the tip and bac~ down the insole bottom where it may terminate at wires exitins the side or bottom of the bool bladder or inner shell, or alternatively it may extend out through a slit in the heel of the boot bladder or inner shell to the upper heel of the boot shell. In either case, the heating ele~en is electrically powered via disconnectable contact pin means extending from the inside of the boot through the back or heel of the ski boot into contac post means secured in a non-conductive boot anchor securely fastened to the exterior of the boot heel or back. The boot anchor includes a plurality of radially-extending lugs, tabs or protrusions. The power pack assembly includes a case containing an electrical power source in a compartment, preferably two rechargeable Ni-Cad sub "C" cells connected in series via a shunt and contacted by two battery spring contacts ex~ending into a cavity at the base of the case, the cavity having an open aperture defined at its periphery by a series of slots or discontinuities adapted to receive the like-shaped lugs, tabs or protrusions on the boot anchor. An elastomeric sealing element may surround and extend downwardly from the periphery of the -cavity opening, and compressively seal against a continuous lip or flange protruding laterally from the boot anchor below the lugs when the power pack assembl~
is placed over the boot anchor so that the boot anchor lugs or protrusions are aligned with the slots or discontinuities. Alternatively, a flexible donu~ may surround the aperture inside the cavity to exclude lce, snow and water.
~091/0'~9r) PCr/~S~0/~7/l 2 ~ ~7 ~ 6-To engage the boot anchor with the power pack, the power pack is ro~ated thereon after the lugs enter ~he case slots, a wave spring washer inside the case cavity being compressed by the intruding boo~ anchor so as to firmly hold the case in position. If the case is rotated 90 in either direction, the case is locked to the boot anchor, but the heating system remains inoperative as the spring contacts do not engage the contact posts protruding through the center of the boot anchor.
Further 90~ rotation in the same direction as the ini~ial rotation results in the completion of the electrical circuit between the batteries in the power pack assembly and the heating element in the boot assembly.
BRIEF DESCRIPTION OF DR~WINGS
The present invention will be more readily understood by one of ordinary skill in the art through a review of the following detailed description of a preferred embodiment, taken in conjunction~with the accompanying drawings, wherein:
I
FIG. 1 is an exploded view of the components of the boo~
as-sembly of a first preferred embodiment of the presen~
invention.
FIG. 2 is an exploded view of ~he components of the power pack assembly of a first preferred embodiment of .
the present invention.
FIG. 3 is a side section of the boot anchor portion of the boot assembly installed on a ski boot.
FIG. 4 is a side section of the power pack assembly of the present invention.
, wo sl/n~ '5~3~)/03"l _7_ ~71~3 FIGS. 5. ;A, 5B and 6 depict the boo~ ancnor used wi~:r, the boo~ asse~bly of FIGS. 1 ana 3, FIG. 5 being a ~o~
elevation cf the boot anchor and FIGS. 5A and 5B being sections taken along lines A-A and ~-B o FIG. 5.
FIGS. 7, 7A, 7B, 7C and 7D depict the spring con~act housing used with the power pack assembly of FIGS. 2 and 4, FIG. 7 being a bottom interior elevation of the housing, FIG. 7A being a side elevation thereof, FIGS. 7B and 7C being sections taken along lines B-B and C-C of FIG. 7, and FIG. 7D being an enlarged detail of the edge of the housing ~aken a~ D in FI~. 7A.
FIGS. 8A and 8B depict a spring contact used.with the power pack assembly of FIGS. 2 and 4.
FIGS. 9, 9A, 10 and 11 depict one-half of the case of a power pack assembly of FIGS. 2 and 4, FIG. 9 being an interior side elevation, FIG. 9 being a side section taken along lines A-A of FIG. 9, FIG. 10 being a bottom elevation, and FIG. 11 being an exterior end elevation.
1. .
FIG. 12 is a composite bottom view of the elements of the power pack assembly of FIGS. 2 and 4.
FIGS. 13, 14 and 14A depict a heating element used with the present inventionl FIG. 14A being an enlarged section taken at A in FIG. 14.
FIG. 15 is a schematic side section of a heating element disposed in a ski boot inner shell according to one preferred embodiment of the present invention.
FIGS. 16 through 22, 26 and 27 depict the components o' a second preferred embodiment of the power pack assembly of the present invenlion; FIG. 16 being a bottom interior elevation of a battery housing cover and ' ~" ' ~V09~/05~0 Irr/~S~J0/0~771 2~716~
~IG. 16A being a section thereof taken along line A~
FIGS. 17, 17A-C and 18 being various views of a con~ac~
spring housing; FIG. 19 being a top elevation of a ba~tery housing cover and FIG. l9A being a sec'ion thereof taken along line A-A; FIGS. 20-22 being views of a spring housing cap; and FIGS. 26 ana 27 being ena and side elevations of a spring contact.
FIGS. 23, 23A, 24, 25 and 25A are views of a boo~ anchor according to a second preferred embodiment of the present invention, FIG. 23 being a bottom elevation, FIG. 23A being a side section taken along line A-A of FIG. 23, FIG. 24 being a side elevation, ~IG. 25 being a top elevation, and FIG. 25A being a section taken along line A-A of FIG. 25.
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FIGS. 28 and 29 are, respectively, a side partial sectional elevation of a second preferred embodiment of an anchor contact pos' and a bottom elevation thereof.
FIG. 30 is a side partial sectional elevation of a -i second preferred embodiment of a contact pin.
MODES FOR CARRYING OUT THE INVENTION
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Referring now to FIGS. 1 and~3 of~the drawings, a firs preferred embodiment of the boot assembly l0 of the present inven~ion will be described in detail. Boot assembly 10 includes a flexible printed electrical resistance circuit heating element 12 to provide hea' 'o the foot of the boot wearer. The heating element 12 depicted in detail in FIGS. 13, 14 and 14A is electrically connected through the upper heel section 14 of a ski boo via two element contact pins 16 which extend through a semi-rigid phenolic support 18 inlo and through apertures 20 in heating element 12, where the ends thereof are upset to permanen ly secure the pins ~o . .
~ (~1/05491) PCT/I~S9(r/~ 771 g 2~71~
the heating elemen~. As can be seen in bo~h FIGS. 1 and 3, pins 16 are slot`ed to provide resilience when laterally compressed, and extend throug:~ boo~ section 14 into contac' apertures 22 in boot anchor 24, which is secured to boot section 14 by two screws 26 extending inwardly through anchor apertures 28 boo~ sec~ion 14 to engage "T~ nuts 30. Contact pins 16 are laterally compressed by sleeve-like anchor contac~ posts 32 surrounding pins 16 where they extend through contac~
apertures 22, contact pins 16 being frictionally bu~
removably secured in anchor contact posts 32 by the aforemen'ioned lateral resiliency impar~ed by ~he diametrical slots. Anchor contact posts 32 may be adhesively bonded or mechanically secured by interference fit to boot anchor 24.
As can be seen in FIG. 3 of the drawings, the sliding frictional engagement of contact pins 16 in anchor contact posts 32 permits the boot assembly 10 of ~he present invention to be installed on any standard ski boot whether the boot wall is merely a 'hin plas~ic shell or is a heavy laminate. The friclional contact also permits the bool liner or bladder to which hea'ing element 12 is affixed to be easily removed from the outer boot fcr drying after wear or for installation or removal of custom-fit prosthetic devices such as arch supports, heel lifts, etc.
FIGS. 2 and 4 of the drawings show a first preferred embodiment of the power pack assembly 38 of the presen~
invention. Assembly 38 comprises a bat'ery case 40, including two mirror-image battery case halves 42 and 42', which encase two sub "C" cell Ni-Cad rechargeable ba teries 44. Batteries 44 are electrically connec~ed in series by battery shunt 46, and electrical connec'ion to anchor contac' pos s is provided by two mirror-image battery spring contacts 48 and 48', which are fixedly ;.
WO 91/0~490 Pcr/l~Sf)f~/o5~
~ ~) 6 7 ~ o-mounted in and to plastic contact housing 50, which in turn is secured to case 40. Wave spring washe~ 52 surrounds contact housing 50 inside of battery case 40.
Elastomeric water seal 54 is bonded to the bo~om of battery case 40 and surrounds the boot anchor recep~acle aperture 56 extending into the interior of the ba~tery case ~0. The battery case halves and the contact housing may be adhesively or mechanically secured together into an assembly, as well known in the ar~.
A more complete appreciation of the sophistica~ed simplicity and the advantages of the presenl invention over the prior art will be afforded through reference ~o the components of the invention. FIG. 5 shows boot anchor 24 from the top, as it would appear when moun'ed on a ski boot heel. Referring to FIGS. 5, 5A, 5B and 6, boo' anchor 24 includes a laterally extending flange 60 of square configuration, sur~ounted by a truncated tubular anchor element 62 having lugs, tabs or flanges 64, 66 and 68 extending laterally therefrom at its top periphery. Lug 64 defines a larger arc than lugs 66 and 68, both of which extend farther from the periphery of element 62 than lug 64. Lug 68 is placed symmetrically diametrically opposite lug 64, and lugs 66 flank lug 68 symmetrically to either side. The lower surface of lug 68 ~see FIG. 6) includes a detent 70 having 'apering side surfaces. The interior of boot anchor 24 includes contact apertures 22 (to accommodate contact posts 32) which e~tend at their upper ends into the wall of element 62, and anchor apertures 28, which have at-their outer ends chamfers 72 to accommodate the heads of screws 26 where anchor 24 is secured to a ski boot.
Struts 74 under flange 60 support flange 60 agains~
forces exerted when power pack assembly is being attached to boot anchor 24, and generally lend rigidity to boo' anchor 24.
w09l/0549~) P~-r/~ o/~slJl 6 7 ~ ~ ~
Referring to FIGS. 7 and 7A-7D, con'ac~ housins 50 comprises a cup-shaped plas'ic molding having symme~rically placed laterally cut slits 76 in ~he outer walls thereof, a diame'rically extending full-height central wall 78, a short lateral wall 80, ~wo 'ubular spring towers 82 symmetrically flanking central wall 78, and a tubular end tower 84 at the enc of central wall 78. Spring towers (see FIG. 7C) are c~' out a~ ~heir inner peripheries. The top edge 88 of con~act housing 50 includes a tongue 90 (see FIG. 7D) and an alignment posl 92.
Spring contact 48 is depicted in FIGS. 8A and 8~, as well as being shown from a third perspective.in FIGS. 2, 4 and 12. Spring contact 48, and its mirror-image twin, contact 48', are preferably of nickel-coated spring steel, such as music wire. Small arc 94 provides lateral resiliency to large arc 96 which extends through the slit 76 of contact housing 50 to provide selec'ive electrical contact with posts 32. Inner leg 98 of contac~ 48 rests in a tower cutout in contact housing 50 and provides torsional stability to thellarge arc loop 100. ~lertical leg 102, extending perpendicularly to the plane of large arc loop 100, extends through an aperture in the battery case to the battery cavity, and outer leg 104 leads to battery contact flat 106.
FIGS. 9-11 depict one-half 42 of ba'tery case 40, it being understood and appreciated that mirror-image half 42' is of like, mating consLruction, the dividing line between the case halves symmetrical defining anchor .
receptacle aperture 5~. Case half 42 is of high-impact plastic, and defines one-half of a battery cavi~y 108 and an anchor receptacle 110. Partition wall 112 extends from floor 114 in the center of battery cavity 108 assis.s with case rigidity and proper alignment of spring contacts 48 and 48' (see FIG. 4). Spring ' W091/0549l) ~C'r/-~9~1/0~771 2 13 6 r~l b` 5 -12-alignmen~ s~ruts 116 center wave spring 52 in anchor receptacle 110 where case 40 is assembled (see FIG. 12). The bottom 120 of case half 42 defines one-half of anchor receptacle aperture 56, which includes slots 64', 66' and 68' of similar orienta~ion and configuration to boot anchor lugs 64, 66 and 68.
Due to the symmetry of case half 42, one-half of slots 64 and 68 are present in case half 42, the other half in case half 42'. One each of slots 66 is located in the bottom of each case half. Similarly, a locking recess 122 is located in case half 42 and another in case half 42', while each case half defines one-half of swi~ching recess 124. Locking recesses 122 are diametrically opposed in assembled case 40, and swi'ching recess is loca~ed perpendicularly to a diametrical line extending between locking recesses 122. Half-circular contact housing recess 126 is located centrally on the bo~tom of case floor 114, the other half being located in case 42', the two defining a circle and an alignment post aperture 128 (half of it shown in FIG. 10) so tha~
contact housing 50, when inserted into case 40 with spring contacts 48 and 48', will be properly rotationally aligned when alignment post 92 mates with aperture 128. Spring-contact aperture halves 130~ to permit the spring contacts 48 and 48' to extend from below to above floor 114 into battery cavity 108 (see FIG. 4) are located adjacent to and on either side of partition wall 112.
FIG. 12 shows various elements of power pack assembly 38 superimposed to better illustrate the alignment and relative dimensions of the various parts of the assembly. It is not an actual section, nor is i' intended to be taken as such.
FIGS. 13, 14 and 14A depict a preferred embodimenl of the heating element 12 of the present invention. The U/O 91~05'~90 P~r/t~sl3~ /7J
-13- 2 ~ ~ 7 1 ~ ~
flexible resis.ance circuit 140 of elemen~ i2 is prin~ea on plastic subs~rate 142. Subs'ra.e 142 is sandwiched between single-sided adhesive tape 144 on the bo~om, and a fabric 146 affixed with pressure sensitive adhesive on the top. Fabric 146 also extends over support 18 and around contact pins 16. Tape 144 ex~ends over the upset ends of pins 16, which hold pins 16 ~o circuit 140 and to support 18. Each pin 16 is in electrical communication with a circuit path 148, which extends to a resistance circuit grid (not shown) a~ the opposite end of circuit 140. This half-oval shaped grid, the location of which is designated at 150, i5 coa'ed with a pressure sensitive adhesive 152 on i~s top. It should be noted that tape 144 stops shor' of grid 150. Finger tab 154 (FIG. 13), which is used to insert and pull out plns 16 from anchor contac~ pos s 32, is formed by the adherence of wings lS6 of fabric 146 to each other after folding around the lamina~e of tape 144 and substrate 142. As shown schematically in 20 FIGo 15, the hea~ing elemen~ grid 150 is adhered by adhesive 152 to the top 158 of a ski boot insole 160.
The rest of the flexible circui 140 on subs~r~te 142 extends over the toe of the insole 160, along the bottom 162 thereof, and exits boot inner shell or bladder 164 (also referred to as a "bootien) through slit 166, running along the level 16~ of bladder 164 to the point at which pins 16 can be inserted into the contact posts 32 of ski boot 14 (not shown in FIG. 15). Spacing bet.ween the aforemen_ioned elements in FIG. 15 has been greatly exaggerated for clarity in understanding specific loca ional relationships.
Referring now _o all of the drawing figures, but particularly FIGS. 3, 4 and 12, the operation of the present inven.ion will be described. Boo' assembly 10 is installed, as previously discussed, on any pair of ski boo s 14 of choice. Heating element 12 has been . . ~.
.. . . . .
.
., WO91/05490 PCT/~S(~0/057/1 2~67~ 14-installed on the insoles 160 of the boo~s 14, and run inside of ~ladders 164 as shown in FIG. 15, biadders 164 then being installed in normal fashion in boo s 1~ and pins 16 inserted and frictionally held in anchor con'ac~
posts 32 of.boot anchor 24. Power pack assembly 38 with fully charged batteries 44 is placed with aper~ure 56 facing boot anchor 24 at the heel of each boot 14.
Slots 64', 66' and 68' on case 40 are aligned with lugs 64, 66 and 68 on boot anchor 24. Case 40 is placed over boot anchor element 62, which compresses wave spring 56 inside cavity 110. Case 40 is then turned 90 in either direction, which results in detent 70 on anchor lug 68 engaging one of two locking recesses 122 on the inside of case 40 and, with wave spring 56, locking power pack assembly 38 to boot anchor 24. The heater remains inactive at this point, because spring contacts 48 and 48' are not contacting anchor contact posts 32 on 'he inside of anchor 24. Further 90 rotation in the same directlon as the initial rotation results in detent 70 engaging switching recess 124, and case 40 remains locked to anchor 24. The electrical circuit between batteries 44 and heating element 12 is now completed through contact.pins 16, contact posts 32 and spring contacts 48 and 48', as the latter have been rotated into a position when they biasingly engage the sides of contact posts 42. Wave spring 56 provides sufficient resilience to lock case 40 to anchor 24 in either the locking or switching positions of power pack assembly 38, and water seal 54 compressively engages flange 60 on anchor 24 to form a water-tight seal between flange 60 and the bottom of case 40, thus isolating the electrical connection and switching function between boot assembly 10 and power pack assembly 38 from water, ice and snow.
When it is desired to turn off the heat, 90 rota~ion of case 40 will achieve that result, and further 90 rotation in the same direction can be used to remove power pack assembly just prior to a race, or to replace ,' .
.
, WO9l/f~5~9() ~Cr/~90/~;~71 -15- 2~7~
it with a fresh assembly, or 'o recharge ba~teries 4~ a the end of the day.
Referring now to FIGS. 16-30 of the drawings, ~he elements of a second preferred embodiment of the invention will be described in detail. It should be understood that the elements of the second preferred embodimen~ differ primarily in s~ructural simplicity, and that the heretofore-described method of operation of the first preferred embodiment is also applicable 'o the second.
The elements of an alternative preferred boot assembly 210 of the present invention are depicted in ; 15 E`IGS. 23-25A and 28-30. Heating element 212 is similar to heating element 12, except that the flexible circui~
substrate terminates under the arch of the insole inside the bootie, bladder, or inner shell 164, whereupon the electrical circuit extends to the heel of the boo 14 via two twenty-two gauge wires 400, which extend through small apertures in the side or bottom of the bootie, bladder or inner shell 164 and run along the outside thereof. I' has been found hat the foregoing s~ructure facilitates placement and retention of the heater ~5 elemen. in the boot, as well as removal and re-inser~ion of the bootie, bladder or inner shell 164 with the heating element in place. Wires 400 may be soldered to contact pins 216 (FIG. 30) in addition to being mechanically clamped thereto by the upse ting of the ends thereof after extension through plenolic suppor.-18, in the manner shown in FIG. 14A with respect to element 12 and pin 16.
~owever, it is actually preferred that pins 216 not be connected by support 18 in some instances, as cer~ain brands of ski boots include ribbing on he interior of ~he boo' shell and it is easier to ex~end the pins 21~
.
' ~ . , , ' ' - .
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U'O 131/05~9r) l~cr/~s~ ) ." 1 2~7~ ~5 be~ween ~he ribs into posts 232 when pins 216 are no~
linked ~ogether or in~erconnected in a single assemDly.
Pins 216 are not slo~ed or bifurca~ed as pins 16, and are frictionally mai~'ained in anchor con~ac~ pos~s 232 (~IGS. 28, 29) by resilient inner fingers 233. The outer surface of posts 232 may be knurled as shown a~
235, to facilita'e an interference fit retention of posts 232 in contact apertures 222 of boo' anchor 224, but this has been found to be unnecessary.
Boo~ anchor 224 (FIGS. 23~25A~ is similar 'o boo' anchor 24, and is secured to a ski boot 14 by two screws (no~
shown) similar to screws 26, bu having a thread design adapted to engage the inner walls of anchor aper.ures 228 so ~hat nuts, such as nuts 30, are unnecessary.
Such screw designs are well known in the ar' and are no' material ~o the present invention. Boo~ anchor 224 includes a trunca'ed tubular anchor element 262 having lugs, tabs or flanges 264, 266 and 268 extending laterally therefrom at its top periphery, and the shape and placement thereof on anchor element 262 is virtually identical to the lug configuration of boot anchor 24, with the exception tha' there is no detent on he bottom of lug 268. Contact apertures 222, into which are inserted anchor contact pos's 232, extend at their uppe.
ends into the wall of element 262.
Referring to FIGS. 16-22, 26 and 27, an alternative preferred embodiment of power pack assembly 238 comprises a battery case 240, including a battery housing cover 242 and a battery housing base 244.
Contact housing 250, a plas'ic molding like ba'tery housing cover 242 and base 244, is sandwiched therebe'ween where case 240 is assembled, and provides a floor 314 for batteries placed inside battery cavi y 308 of cover 242. Ni-Cad sub ~C" cells 44 are deployed in . ' ': . ; :
' ~09l/~ 9() ~ r/~ o/o~"
2 ~ 3 ba~'er~ cavity 108. Par~i~ion but'resses 402 anà siae bu~tresses 404 inside cover 242 provice rigidi~y ~o cover 242. Batteries 44 are suppor'ed by floor 314 of con'ac~ housing 250, and are positioned by cradles 408 (see FIG. 17C) and end stops 410. Alignmen~ of con~ac housing 250 inside battery housing cover 242 is facili~a~ed ~y the ma~ing of alignment pos~ 406 in alignment slot 412, contact housing 250 then being disposed in recess 414 agains~ side buttresses 404 and buttresses 402. Spring con'acts 24& and 248' are, like their counterparts 48 and 48', mirror images of one another, but are much simpler, comprising (FIGS~ 26 ana 27) con~ac~ loops 416 and leg 418. As shown in FIGS. i7, 17B, 17C and 18, con act loops 418 lie in arcuate channels 420 in contact housing tower 422 of con~ac~
housing 250, extending laterally beyond the diameter of tower 422 through windows 424. Channels 420 surround contact housing pos's 426 and, when spring contac~s 248 and 248' are disposed in channels 420, plas~ic caps 430 and 430' (FIGS. 20-22) are snapped over .runca~ed pos~s 426 to maintain spring contacts 248 and 248' in place. ~-Caps 430 and 430' are mirror images of one another, each having an edge 432 of enlarged radius to match tha' of tower 422, a ~ab 434 to align with dimples 436 off of channels 420 in towers 422, and a cutout 438 to align with ejector pin aper~ures 440 in tower 422.
Legs 418 of spring contacts 248 and 248' ex~end through frustoconical contact passages 442 when contact loops 416 are in channels 420, and are ben' to reach the ends of Ni~Cad cells 44 (FIG. 17C), where they are soldered at 444 to the contacts thereof. As with the firs~
preferred embodiment of the invention, the o'her ends of cells 44 are laterally electrically connec'ed via a shun~ 46 (not shown).
.
W~3 91/n~4~)0 ~cr/~s~3~ S" I
~ 18-Battery housing base 244 is a single-piece plas.ic molding and defines, when assembled witn con ac~ housir;c 250 and cover 242, an anchor receptacle 310, into which opens anchor aperture 256, of similar configura.ion ~o aperture 56 of the first preferred embodiment Aperture 256 includes slots 264', 266' and 268', of similar orientation and configuration to boot anchor lugs 264, 266 and 268 Spring alignment struts 316, like s~ruts 116, serve to centrally align wave spring 52 abou~
aperture 256 In lieu of the locking and switching recesses used in the first embodiment, discontinuous arcuate track 450 is utilized for locking and swi~chins of the power pack assembly 238 Gaps 452 in track 450 provide an initial secondary locking position for 'he power pack assembly, while locking gaps 454 serve the same purpose as locking recesses 122 in the firs.
preferred embodiment, and switching gap 456 performs the same function as switching recess 124 As can be seen in FIG l9A, track 450 is of reduced height at segmen s 458 bounding swi ching gap 456, to give a different feel when the power pack assembly 238 is rotated from a locked position with lug 268 in one of locking gaps 454 into switching gap 456 to turn on heating elemen~ 212, than when power pack assembly is being rotated in the opposite direction to remove it from boot anchor 224, thl~s signalling the boot wearer of the proper direc~ion in which to rotate , Other than the inclusion of auxiliary or secondary locking gaps 452 to provide additional security for power pack assembly 238 in the even. of impact, skier falls, or other shocks and jars, the insertion and rotation of power pack assembly 238 into boot anchor 224 is identical as far as operation of the device is concerned Water seal 54 and flange 60 or boot anchor 24 have been eliminated in the second preferred embodiment, and in lieu thereof a Lexan or other ,'' ' ~' ` , w~3l/~sisl) ~rr/~s~30/~)3~ / 1 -19- 2~7~ ~
resilien~ donu' or washer is placed be~ween wave spring 52 and anchor aper~ure 256, 'he donu' being flexible enough to bend away from lugs 264, 266 and 268 when the~
enter cavity 310, and ~o fairl~ closely engage 'he outside side of anchor elemen~ 262 below ~he lugs 'o exclude ice, snow and water from 'he cavity 310.
It will be apprecia'ed by those of ordinary skill in 'he art that the present invention comprises a novel and unobvious solution to a long-recognized problem unsolved by the prior art. The presen~ invention provides a universal ski boot heating sys'em adaptable .o any boo' make, design, or ias', and one 'ha does not hinder or impair normal boot function and maintenance. Moreover, the presen~ inven ion reliably func'ions in all wea'her conditions, and is rugged enough to survive the demands placed upon it by the most aggressive skier. Further, the easy replaceability of the present inven'ion's power pack assembly permits the carrying of spare power packs for long days on the slopes, or removing the power packs when skiing and replacing them when waiting for lifts.
The present invention also permits ski racers to maintain foot warmth until immediately prior to a race heat, and then remove the power packs to be free of the excess weight during the race.
While the present invention has been described in terms of a preferred embodiment, it is not so limited. Many additions, deletions and modifications may be made to the preferred embodiment wi'hout departing from he spirit and scope of the claimed invention. For example, a non-rechargeable power source may be used; 'he anchor and anchor receptacle locations might be interchanged between the boot assembly and power pack assembly; other designs of resilient contacts are usable; and more.
:
, ~ ,
UNIVERSAL SKI BOOT HEATER
TECHNIC~L FIELD
The present invention relates generally to electrical heating systems for footwear, and specifically to a universal heating system adaptable to ski boots o any design and manufacture.
BACKGROUND ART
Cold, and specifically cold feett has been a major iimiting factor in the ability of the outdoor sportsman to appreciate and enjoy winter sports. As technology has improved throughout the years, fleece-lined leather boots have given way to footwear constructed using various I synthetic shell materials and foam, ThinsulateTM and other insulations. This improved winter footwear has benefited skiers, who now enjoy a variety of rigid boot shell designs insulated with the aforementioned materials. However, since downhill or alpine skiers spend extended periods of time outdoors, two major problems still inhibit foot warmth, one being a function of the nature of the sport and the second of advances in boot technology. The first phenomenon referred to above involves the long periods of relative inactivity while skiing, attributable to lift lines and long lift rides, the latter on chair lift chairs which inhibit blood circulation to the lower extremities. The second phenomenon is associated with boot technology advances in the areas of foot retention and responsiveness of the boot and attached ski to body movement. ~ven though .: . ' ~ , ' ~ --WO91/05~90 Pcr/~s~ 7,I
c~06r~ 2-many different lasts are available for ski boo- inn~r shells, ana custom lasts are relatively inexpensive for the benefit gained, many skiers tighten their boots to an extraordinary degree to give bet~er ski conrro' and feedback from the ski through the foot, ankle and calf regions of the leg. This tightness constricts the foot and ankle regions, restricting blood flow thereto and contributing to cold feet.
Ski racers, like other skiers, experience the above-mentioned problems. However, the adverse consequences of cold feet to their performance is even more dramatic at high racing speeds where the ~feel" of the skis ana terrain is all-important to promote optimum times and avert catastrophic injury.
.
Since completely insulated ski boot structures would be massive and unwieldy, many efforts have been made to artificially provide heat, generally electrical, to the feet. For example, U.S. Patent No. 4,080,971 discloses a calf-mounted battery pack having a wire extending to a footwear insole incorporating a resistance heating element. This device is obviously inappropriate for skiing, as the bumps and shocks encountered as well as calf flexing would cause the battery pack to slip down the leg in short order. U.S. Patent No. 4,837,494 discloses a ski-mounted battery pack-including a wheel-type generator for battery recharging, the battery pack providing power to a resistance element in a ski boot through a connecting cable. The battery pack and generator weigh down and unbalance the ski, and the presence of cable connectors is a safety hazard to proper binding operation and to a total boot from ski release.
Several designs have been proposed for incorporating batteries in the ski boot structure itself. U.S. Patent ., , . , : .
~: , .: .
.
.
' . , .
' WO 91/0~490 P~: r/~s(~ 577l 2~7~
Nos. 3,977,093 and 4,507,877 eacn disclose bat.eries housed in boot or shoe soles, powering resistance hea'er type insoles. These designs render it virtuall~
impossible to remove and replace batteries during a dav of skiing, and additionally require sDecialized footwear designs having battery cavities. Additionally, the on/off switch of the '093 patent is inside the boo~ and activated by the heel of the wearer, preventing its being turned off. The '877 switch is on the exterior of the boot, and thus susceptible to water incursion and icing problems, as well as impact damage from skier falls.
.S. Patent No. 4,798,933 discloses another design, one of the type commonly seen in commercially available heated ski boots today. This design uses a molded cavity in a bulge on the back of the ski boots to accommodate batteries, but there is no access to remove same except from the inside of the boot after the inner bladder or soft shell is removed. Again, as with the designs previously mentioned, the on/off switch is on the exterior of the boot.
U.S. Patent Nos. 4,697,359 and 4,780,968 disclose several variations of a ski boot design with integral heater, wherein a plug-in type battery pack is housed in cavities or apertures which can be located on the back, instep or top front of the boot. The '359 patent discloses a battery pack having only contacts for plugging into the bOotr the switch for turning the current on or off being included in the boot structure. The '968 embodiment includes the switch in the battery pack. The disadvantage of the foregoing designs resides in the necessity of special boot shells to accommodate the battery packs, and of fragile swi~ches susceptible to icing as the boots become wet and then freeze during wear.
, ~., .~ , . .
' ~ .
WO91/U~q~ PCI/US9~J/~5771 ~ 2~671~5 -4_ A more versatile boo~ heater design is disclosed in U.S.
Patent Nos. 3,859,496 and 3,946,193, wherein a battery case is mounted on the heel or back of a ski boot having a metal mounting plate thereon, and the heater is turned on and off by moving the battery pack up and down on the mounting plate on rails between an on and an off position. While this design is usable on any ski boot to which a mounting plate has been affixed, the use of electrical contacts on the exterior of the battery pack can result in shorts from water on the mounting plate or battery pack, and the boot wearer has to ascertain whether the heater is on or off by experimentally sliding the packs up or down on the plates, waiting to see if his feet get warm, or having a companion switch to turn the device on or off or observe which position the pack is in on the plate. Moreover, the mounting plate is itself mounted on a bracket secured to the ski boot, leaving the wires to the contacts exposed to the weather as well as build up of water, snow and ice, which accelerates deterioration thereof. Finally, the heiating element is electrically connected to the mounting plate contacts via screws accessible only from the boot interior, making easy removal of the insole or boot liner impossible.
In short, the boot heaters of the prior art suffer from either reliability problems, operational problems, or manufacturing complexities which render them all inadequate in solving the problem of cold feet in an economical, reliable manner.
DISCLOSURE OF INVENTION
In contrast to the prior art, the ski boot heating system of the present invention provides reliability and simplicity as well as economic design.
.
' .
~91/0~9~ pGr/
-5- 2 ~ ~7 1 ~a The ski boo~ heating system of the present inventio, comprises a boot assembly and a power pacY assembly.
The boot assembly includes a heating element in the form of a flexible circuit substrate having an electrical resistance circuit thereon which extends from the top front of the boot insole, around the tip and bac~ down the insole bottom where it may terminate at wires exitins the side or bottom of the bool bladder or inner shell, or alternatively it may extend out through a slit in the heel of the boot bladder or inner shell to the upper heel of the boot shell. In either case, the heating ele~en is electrically powered via disconnectable contact pin means extending from the inside of the boot through the back or heel of the ski boot into contac post means secured in a non-conductive boot anchor securely fastened to the exterior of the boot heel or back. The boot anchor includes a plurality of radially-extending lugs, tabs or protrusions. The power pack assembly includes a case containing an electrical power source in a compartment, preferably two rechargeable Ni-Cad sub "C" cells connected in series via a shunt and contacted by two battery spring contacts ex~ending into a cavity at the base of the case, the cavity having an open aperture defined at its periphery by a series of slots or discontinuities adapted to receive the like-shaped lugs, tabs or protrusions on the boot anchor. An elastomeric sealing element may surround and extend downwardly from the periphery of the -cavity opening, and compressively seal against a continuous lip or flange protruding laterally from the boot anchor below the lugs when the power pack assembl~
is placed over the boot anchor so that the boot anchor lugs or protrusions are aligned with the slots or discontinuities. Alternatively, a flexible donu~ may surround the aperture inside the cavity to exclude lce, snow and water.
~091/0'~9r) PCr/~S~0/~7/l 2 ~ ~7 ~ 6-To engage the boot anchor with the power pack, the power pack is ro~ated thereon after the lugs enter ~he case slots, a wave spring washer inside the case cavity being compressed by the intruding boo~ anchor so as to firmly hold the case in position. If the case is rotated 90 in either direction, the case is locked to the boot anchor, but the heating system remains inoperative as the spring contacts do not engage the contact posts protruding through the center of the boot anchor.
Further 90~ rotation in the same direction as the ini~ial rotation results in the completion of the electrical circuit between the batteries in the power pack assembly and the heating element in the boot assembly.
BRIEF DESCRIPTION OF DR~WINGS
The present invention will be more readily understood by one of ordinary skill in the art through a review of the following detailed description of a preferred embodiment, taken in conjunction~with the accompanying drawings, wherein:
I
FIG. 1 is an exploded view of the components of the boo~
as-sembly of a first preferred embodiment of the presen~
invention.
FIG. 2 is an exploded view of ~he components of the power pack assembly of a first preferred embodiment of .
the present invention.
FIG. 3 is a side section of the boot anchor portion of the boot assembly installed on a ski boot.
FIG. 4 is a side section of the power pack assembly of the present invention.
, wo sl/n~ '5~3~)/03"l _7_ ~71~3 FIGS. 5. ;A, 5B and 6 depict the boo~ ancnor used wi~:r, the boo~ asse~bly of FIGS. 1 ana 3, FIG. 5 being a ~o~
elevation cf the boot anchor and FIGS. 5A and 5B being sections taken along lines A-A and ~-B o FIG. 5.
FIGS. 7, 7A, 7B, 7C and 7D depict the spring con~act housing used with the power pack assembly of FIGS. 2 and 4, FIG. 7 being a bottom interior elevation of the housing, FIG. 7A being a side elevation thereof, FIGS. 7B and 7C being sections taken along lines B-B and C-C of FIG. 7, and FIG. 7D being an enlarged detail of the edge of the housing ~aken a~ D in FI~. 7A.
FIGS. 8A and 8B depict a spring contact used.with the power pack assembly of FIGS. 2 and 4.
FIGS. 9, 9A, 10 and 11 depict one-half of the case of a power pack assembly of FIGS. 2 and 4, FIG. 9 being an interior side elevation, FIG. 9 being a side section taken along lines A-A of FIG. 9, FIG. 10 being a bottom elevation, and FIG. 11 being an exterior end elevation.
1. .
FIG. 12 is a composite bottom view of the elements of the power pack assembly of FIGS. 2 and 4.
FIGS. 13, 14 and 14A depict a heating element used with the present inventionl FIG. 14A being an enlarged section taken at A in FIG. 14.
FIG. 15 is a schematic side section of a heating element disposed in a ski boot inner shell according to one preferred embodiment of the present invention.
FIGS. 16 through 22, 26 and 27 depict the components o' a second preferred embodiment of the power pack assembly of the present invenlion; FIG. 16 being a bottom interior elevation of a battery housing cover and ' ~" ' ~V09~/05~0 Irr/~S~J0/0~771 2~716~
~IG. 16A being a section thereof taken along line A~
FIGS. 17, 17A-C and 18 being various views of a con~ac~
spring housing; FIG. 19 being a top elevation of a ba~tery housing cover and FIG. l9A being a sec'ion thereof taken along line A-A; FIGS. 20-22 being views of a spring housing cap; and FIGS. 26 ana 27 being ena and side elevations of a spring contact.
FIGS. 23, 23A, 24, 25 and 25A are views of a boo~ anchor according to a second preferred embodiment of the present invention, FIG. 23 being a bottom elevation, FIG. 23A being a side section taken along line A-A of FIG. 23, FIG. 24 being a side elevation, ~IG. 25 being a top elevation, and FIG. 25A being a section taken along line A-A of FIG. 25.
` :
FIGS. 28 and 29 are, respectively, a side partial sectional elevation of a second preferred embodiment of an anchor contact pos' and a bottom elevation thereof.
FIG. 30 is a side partial sectional elevation of a -i second preferred embodiment of a contact pin.
MODES FOR CARRYING OUT THE INVENTION
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Referring now to FIGS. 1 and~3 of~the drawings, a firs preferred embodiment of the boot assembly l0 of the present inven~ion will be described in detail. Boot assembly 10 includes a flexible printed electrical resistance circuit heating element 12 to provide hea' 'o the foot of the boot wearer. The heating element 12 depicted in detail in FIGS. 13, 14 and 14A is electrically connected through the upper heel section 14 of a ski boo via two element contact pins 16 which extend through a semi-rigid phenolic support 18 inlo and through apertures 20 in heating element 12, where the ends thereof are upset to permanen ly secure the pins ~o . .
~ (~1/05491) PCT/I~S9(r/~ 771 g 2~71~
the heating elemen~. As can be seen in bo~h FIGS. 1 and 3, pins 16 are slot`ed to provide resilience when laterally compressed, and extend throug:~ boo~ section 14 into contac' apertures 22 in boot anchor 24, which is secured to boot section 14 by two screws 26 extending inwardly through anchor apertures 28 boo~ sec~ion 14 to engage "T~ nuts 30. Contact pins 16 are laterally compressed by sleeve-like anchor contac~ posts 32 surrounding pins 16 where they extend through contac~
apertures 22, contact pins 16 being frictionally bu~
removably secured in anchor contact posts 32 by the aforemen'ioned lateral resiliency impar~ed by ~he diametrical slots. Anchor contact posts 32 may be adhesively bonded or mechanically secured by interference fit to boot anchor 24.
As can be seen in FIG. 3 of the drawings, the sliding frictional engagement of contact pins 16 in anchor contact posts 32 permits the boot assembly 10 of ~he present invention to be installed on any standard ski boot whether the boot wall is merely a 'hin plas~ic shell or is a heavy laminate. The friclional contact also permits the bool liner or bladder to which hea'ing element 12 is affixed to be easily removed from the outer boot fcr drying after wear or for installation or removal of custom-fit prosthetic devices such as arch supports, heel lifts, etc.
FIGS. 2 and 4 of the drawings show a first preferred embodiment of the power pack assembly 38 of the presen~
invention. Assembly 38 comprises a bat'ery case 40, including two mirror-image battery case halves 42 and 42', which encase two sub "C" cell Ni-Cad rechargeable ba teries 44. Batteries 44 are electrically connec~ed in series by battery shunt 46, and electrical connec'ion to anchor contac' pos s is provided by two mirror-image battery spring contacts 48 and 48', which are fixedly ;.
WO 91/0~490 Pcr/l~Sf)f~/o5~
~ ~) 6 7 ~ o-mounted in and to plastic contact housing 50, which in turn is secured to case 40. Wave spring washe~ 52 surrounds contact housing 50 inside of battery case 40.
Elastomeric water seal 54 is bonded to the bo~om of battery case 40 and surrounds the boot anchor recep~acle aperture 56 extending into the interior of the ba~tery case ~0. The battery case halves and the contact housing may be adhesively or mechanically secured together into an assembly, as well known in the ar~.
A more complete appreciation of the sophistica~ed simplicity and the advantages of the presenl invention over the prior art will be afforded through reference ~o the components of the invention. FIG. 5 shows boot anchor 24 from the top, as it would appear when moun'ed on a ski boot heel. Referring to FIGS. 5, 5A, 5B and 6, boo' anchor 24 includes a laterally extending flange 60 of square configuration, sur~ounted by a truncated tubular anchor element 62 having lugs, tabs or flanges 64, 66 and 68 extending laterally therefrom at its top periphery. Lug 64 defines a larger arc than lugs 66 and 68, both of which extend farther from the periphery of element 62 than lug 64. Lug 68 is placed symmetrically diametrically opposite lug 64, and lugs 66 flank lug 68 symmetrically to either side. The lower surface of lug 68 ~see FIG. 6) includes a detent 70 having 'apering side surfaces. The interior of boot anchor 24 includes contact apertures 22 (to accommodate contact posts 32) which e~tend at their upper ends into the wall of element 62, and anchor apertures 28, which have at-their outer ends chamfers 72 to accommodate the heads of screws 26 where anchor 24 is secured to a ski boot.
Struts 74 under flange 60 support flange 60 agains~
forces exerted when power pack assembly is being attached to boot anchor 24, and generally lend rigidity to boo' anchor 24.
w09l/0549~) P~-r/~ o/~slJl 6 7 ~ ~ ~
Referring to FIGS. 7 and 7A-7D, con'ac~ housins 50 comprises a cup-shaped plas'ic molding having symme~rically placed laterally cut slits 76 in ~he outer walls thereof, a diame'rically extending full-height central wall 78, a short lateral wall 80, ~wo 'ubular spring towers 82 symmetrically flanking central wall 78, and a tubular end tower 84 at the enc of central wall 78. Spring towers (see FIG. 7C) are c~' out a~ ~heir inner peripheries. The top edge 88 of con~act housing 50 includes a tongue 90 (see FIG. 7D) and an alignment posl 92.
Spring contact 48 is depicted in FIGS. 8A and 8~, as well as being shown from a third perspective.in FIGS. 2, 4 and 12. Spring contact 48, and its mirror-image twin, contact 48', are preferably of nickel-coated spring steel, such as music wire. Small arc 94 provides lateral resiliency to large arc 96 which extends through the slit 76 of contact housing 50 to provide selec'ive electrical contact with posts 32. Inner leg 98 of contac~ 48 rests in a tower cutout in contact housing 50 and provides torsional stability to thellarge arc loop 100. ~lertical leg 102, extending perpendicularly to the plane of large arc loop 100, extends through an aperture in the battery case to the battery cavity, and outer leg 104 leads to battery contact flat 106.
FIGS. 9-11 depict one-half 42 of ba'tery case 40, it being understood and appreciated that mirror-image half 42' is of like, mating consLruction, the dividing line between the case halves symmetrical defining anchor .
receptacle aperture 5~. Case half 42 is of high-impact plastic, and defines one-half of a battery cavi~y 108 and an anchor receptacle 110. Partition wall 112 extends from floor 114 in the center of battery cavity 108 assis.s with case rigidity and proper alignment of spring contacts 48 and 48' (see FIG. 4). Spring ' W091/0549l) ~C'r/-~9~1/0~771 2 13 6 r~l b` 5 -12-alignmen~ s~ruts 116 center wave spring 52 in anchor receptacle 110 where case 40 is assembled (see FIG. 12). The bottom 120 of case half 42 defines one-half of anchor receptacle aperture 56, which includes slots 64', 66' and 68' of similar orienta~ion and configuration to boot anchor lugs 64, 66 and 68.
Due to the symmetry of case half 42, one-half of slots 64 and 68 are present in case half 42, the other half in case half 42'. One each of slots 66 is located in the bottom of each case half. Similarly, a locking recess 122 is located in case half 42 and another in case half 42', while each case half defines one-half of swi~ching recess 124. Locking recesses 122 are diametrically opposed in assembled case 40, and swi'ching recess is loca~ed perpendicularly to a diametrical line extending between locking recesses 122. Half-circular contact housing recess 126 is located centrally on the bo~tom of case floor 114, the other half being located in case 42', the two defining a circle and an alignment post aperture 128 (half of it shown in FIG. 10) so tha~
contact housing 50, when inserted into case 40 with spring contacts 48 and 48', will be properly rotationally aligned when alignment post 92 mates with aperture 128. Spring-contact aperture halves 130~ to permit the spring contacts 48 and 48' to extend from below to above floor 114 into battery cavity 108 (see FIG. 4) are located adjacent to and on either side of partition wall 112.
FIG. 12 shows various elements of power pack assembly 38 superimposed to better illustrate the alignment and relative dimensions of the various parts of the assembly. It is not an actual section, nor is i' intended to be taken as such.
FIGS. 13, 14 and 14A depict a preferred embodimenl of the heating element 12 of the present invention. The U/O 91~05'~90 P~r/t~sl3~ /7J
-13- 2 ~ ~ 7 1 ~ ~
flexible resis.ance circuit 140 of elemen~ i2 is prin~ea on plastic subs~rate 142. Subs'ra.e 142 is sandwiched between single-sided adhesive tape 144 on the bo~om, and a fabric 146 affixed with pressure sensitive adhesive on the top. Fabric 146 also extends over support 18 and around contact pins 16. Tape 144 ex~ends over the upset ends of pins 16, which hold pins 16 ~o circuit 140 and to support 18. Each pin 16 is in electrical communication with a circuit path 148, which extends to a resistance circuit grid (not shown) a~ the opposite end of circuit 140. This half-oval shaped grid, the location of which is designated at 150, i5 coa'ed with a pressure sensitive adhesive 152 on i~s top. It should be noted that tape 144 stops shor' of grid 150. Finger tab 154 (FIG. 13), which is used to insert and pull out plns 16 from anchor contac~ pos s 32, is formed by the adherence of wings lS6 of fabric 146 to each other after folding around the lamina~e of tape 144 and substrate 142. As shown schematically in 20 FIGo 15, the hea~ing elemen~ grid 150 is adhered by adhesive 152 to the top 158 of a ski boot insole 160.
The rest of the flexible circui 140 on subs~r~te 142 extends over the toe of the insole 160, along the bottom 162 thereof, and exits boot inner shell or bladder 164 (also referred to as a "bootien) through slit 166, running along the level 16~ of bladder 164 to the point at which pins 16 can be inserted into the contact posts 32 of ski boot 14 (not shown in FIG. 15). Spacing bet.ween the aforemen_ioned elements in FIG. 15 has been greatly exaggerated for clarity in understanding specific loca ional relationships.
Referring now _o all of the drawing figures, but particularly FIGS. 3, 4 and 12, the operation of the present inven.ion will be described. Boo' assembly 10 is installed, as previously discussed, on any pair of ski boo s 14 of choice. Heating element 12 has been . . ~.
.. . . . .
.
., WO91/05490 PCT/~S(~0/057/1 2~67~ 14-installed on the insoles 160 of the boo~s 14, and run inside of ~ladders 164 as shown in FIG. 15, biadders 164 then being installed in normal fashion in boo s 1~ and pins 16 inserted and frictionally held in anchor con'ac~
posts 32 of.boot anchor 24. Power pack assembly 38 with fully charged batteries 44 is placed with aper~ure 56 facing boot anchor 24 at the heel of each boot 14.
Slots 64', 66' and 68' on case 40 are aligned with lugs 64, 66 and 68 on boot anchor 24. Case 40 is placed over boot anchor element 62, which compresses wave spring 56 inside cavity 110. Case 40 is then turned 90 in either direction, which results in detent 70 on anchor lug 68 engaging one of two locking recesses 122 on the inside of case 40 and, with wave spring 56, locking power pack assembly 38 to boot anchor 24. The heater remains inactive at this point, because spring contacts 48 and 48' are not contacting anchor contact posts 32 on 'he inside of anchor 24. Further 90 rotation in the same directlon as the initial rotation results in detent 70 engaging switching recess 124, and case 40 remains locked to anchor 24. The electrical circuit between batteries 44 and heating element 12 is now completed through contact.pins 16, contact posts 32 and spring contacts 48 and 48', as the latter have been rotated into a position when they biasingly engage the sides of contact posts 42. Wave spring 56 provides sufficient resilience to lock case 40 to anchor 24 in either the locking or switching positions of power pack assembly 38, and water seal 54 compressively engages flange 60 on anchor 24 to form a water-tight seal between flange 60 and the bottom of case 40, thus isolating the electrical connection and switching function between boot assembly 10 and power pack assembly 38 from water, ice and snow.
When it is desired to turn off the heat, 90 rota~ion of case 40 will achieve that result, and further 90 rotation in the same direction can be used to remove power pack assembly just prior to a race, or to replace ,' .
.
, WO9l/f~5~9() ~Cr/~90/~;~71 -15- 2~7~
it with a fresh assembly, or 'o recharge ba~teries 4~ a the end of the day.
Referring now to FIGS. 16-30 of the drawings, ~he elements of a second preferred embodiment of the invention will be described in detail. It should be understood that the elements of the second preferred embodimen~ differ primarily in s~ructural simplicity, and that the heretofore-described method of operation of the first preferred embodiment is also applicable 'o the second.
The elements of an alternative preferred boot assembly 210 of the present invention are depicted in ; 15 E`IGS. 23-25A and 28-30. Heating element 212 is similar to heating element 12, except that the flexible circui~
substrate terminates under the arch of the insole inside the bootie, bladder, or inner shell 164, whereupon the electrical circuit extends to the heel of the boo 14 via two twenty-two gauge wires 400, which extend through small apertures in the side or bottom of the bootie, bladder or inner shell 164 and run along the outside thereof. I' has been found hat the foregoing s~ructure facilitates placement and retention of the heater ~5 elemen. in the boot, as well as removal and re-inser~ion of the bootie, bladder or inner shell 164 with the heating element in place. Wires 400 may be soldered to contact pins 216 (FIG. 30) in addition to being mechanically clamped thereto by the upse ting of the ends thereof after extension through plenolic suppor.-18, in the manner shown in FIG. 14A with respect to element 12 and pin 16.
~owever, it is actually preferred that pins 216 not be connected by support 18 in some instances, as cer~ain brands of ski boots include ribbing on he interior of ~he boo' shell and it is easier to ex~end the pins 21~
.
' ~ . , , ' ' - .
.
U'O 131/05~9r) l~cr/~s~ ) ." 1 2~7~ ~5 be~ween ~he ribs into posts 232 when pins 216 are no~
linked ~ogether or in~erconnected in a single assemDly.
Pins 216 are not slo~ed or bifurca~ed as pins 16, and are frictionally mai~'ained in anchor con~ac~ pos~s 232 (~IGS. 28, 29) by resilient inner fingers 233. The outer surface of posts 232 may be knurled as shown a~
235, to facilita'e an interference fit retention of posts 232 in contact apertures 222 of boo' anchor 224, but this has been found to be unnecessary.
Boo~ anchor 224 (FIGS. 23~25A~ is similar 'o boo' anchor 24, and is secured to a ski boot 14 by two screws (no~
shown) similar to screws 26, bu having a thread design adapted to engage the inner walls of anchor aper.ures 228 so ~hat nuts, such as nuts 30, are unnecessary.
Such screw designs are well known in the ar' and are no' material ~o the present invention. Boo~ anchor 224 includes a trunca'ed tubular anchor element 262 having lugs, tabs or flanges 264, 266 and 268 extending laterally therefrom at its top periphery, and the shape and placement thereof on anchor element 262 is virtually identical to the lug configuration of boot anchor 24, with the exception tha' there is no detent on he bottom of lug 268. Contact apertures 222, into which are inserted anchor contact pos's 232, extend at their uppe.
ends into the wall of element 262.
Referring to FIGS. 16-22, 26 and 27, an alternative preferred embodiment of power pack assembly 238 comprises a battery case 240, including a battery housing cover 242 and a battery housing base 244.
Contact housing 250, a plas'ic molding like ba'tery housing cover 242 and base 244, is sandwiched therebe'ween where case 240 is assembled, and provides a floor 314 for batteries placed inside battery cavi y 308 of cover 242. Ni-Cad sub ~C" cells 44 are deployed in . ' ': . ; :
' ~09l/~ 9() ~ r/~ o/o~"
2 ~ 3 ba~'er~ cavity 108. Par~i~ion but'resses 402 anà siae bu~tresses 404 inside cover 242 provice rigidi~y ~o cover 242. Batteries 44 are suppor'ed by floor 314 of con'ac~ housing 250, and are positioned by cradles 408 (see FIG. 17C) and end stops 410. Alignmen~ of con~ac housing 250 inside battery housing cover 242 is facili~a~ed ~y the ma~ing of alignment pos~ 406 in alignment slot 412, contact housing 250 then being disposed in recess 414 agains~ side buttresses 404 and buttresses 402. Spring con'acts 24& and 248' are, like their counterparts 48 and 48', mirror images of one another, but are much simpler, comprising (FIGS~ 26 ana 27) con~ac~ loops 416 and leg 418. As shown in FIGS. i7, 17B, 17C and 18, con act loops 418 lie in arcuate channels 420 in contact housing tower 422 of con~ac~
housing 250, extending laterally beyond the diameter of tower 422 through windows 424. Channels 420 surround contact housing pos's 426 and, when spring contac~s 248 and 248' are disposed in channels 420, plas~ic caps 430 and 430' (FIGS. 20-22) are snapped over .runca~ed pos~s 426 to maintain spring contacts 248 and 248' in place. ~-Caps 430 and 430' are mirror images of one another, each having an edge 432 of enlarged radius to match tha' of tower 422, a ~ab 434 to align with dimples 436 off of channels 420 in towers 422, and a cutout 438 to align with ejector pin aper~ures 440 in tower 422.
Legs 418 of spring contacts 248 and 248' ex~end through frustoconical contact passages 442 when contact loops 416 are in channels 420, and are ben' to reach the ends of Ni~Cad cells 44 (FIG. 17C), where they are soldered at 444 to the contacts thereof. As with the firs~
preferred embodiment of the invention, the o'her ends of cells 44 are laterally electrically connec'ed via a shun~ 46 (not shown).
.
W~3 91/n~4~)0 ~cr/~s~3~ S" I
~ 18-Battery housing base 244 is a single-piece plas.ic molding and defines, when assembled witn con ac~ housir;c 250 and cover 242, an anchor receptacle 310, into which opens anchor aperture 256, of similar configura.ion ~o aperture 56 of the first preferred embodiment Aperture 256 includes slots 264', 266' and 268', of similar orientation and configuration to boot anchor lugs 264, 266 and 268 Spring alignment struts 316, like s~ruts 116, serve to centrally align wave spring 52 abou~
aperture 256 In lieu of the locking and switching recesses used in the first embodiment, discontinuous arcuate track 450 is utilized for locking and swi~chins of the power pack assembly 238 Gaps 452 in track 450 provide an initial secondary locking position for 'he power pack assembly, while locking gaps 454 serve the same purpose as locking recesses 122 in the firs.
preferred embodiment, and switching gap 456 performs the same function as switching recess 124 As can be seen in FIG l9A, track 450 is of reduced height at segmen s 458 bounding swi ching gap 456, to give a different feel when the power pack assembly 238 is rotated from a locked position with lug 268 in one of locking gaps 454 into switching gap 456 to turn on heating elemen~ 212, than when power pack assembly is being rotated in the opposite direction to remove it from boot anchor 224, thl~s signalling the boot wearer of the proper direc~ion in which to rotate , Other than the inclusion of auxiliary or secondary locking gaps 452 to provide additional security for power pack assembly 238 in the even. of impact, skier falls, or other shocks and jars, the insertion and rotation of power pack assembly 238 into boot anchor 224 is identical as far as operation of the device is concerned Water seal 54 and flange 60 or boot anchor 24 have been eliminated in the second preferred embodiment, and in lieu thereof a Lexan or other ,'' ' ~' ` , w~3l/~sisl) ~rr/~s~30/~)3~ / 1 -19- 2~7~ ~
resilien~ donu' or washer is placed be~ween wave spring 52 and anchor aper~ure 256, 'he donu' being flexible enough to bend away from lugs 264, 266 and 268 when the~
enter cavity 310, and ~o fairl~ closely engage 'he outside side of anchor elemen~ 262 below ~he lugs 'o exclude ice, snow and water from 'he cavity 310.
It will be apprecia'ed by those of ordinary skill in 'he art that the present invention comprises a novel and unobvious solution to a long-recognized problem unsolved by the prior art. The presen~ invention provides a universal ski boot heating sys'em adaptable .o any boo' make, design, or ias', and one 'ha does not hinder or impair normal boot function and maintenance. Moreover, the presen~ inven ion reliably func'ions in all wea'her conditions, and is rugged enough to survive the demands placed upon it by the most aggressive skier. Further, the easy replaceability of the present inven'ion's power pack assembly permits the carrying of spare power packs for long days on the slopes, or removing the power packs when skiing and replacing them when waiting for lifts.
The present invention also permits ski racers to maintain foot warmth until immediately prior to a race heat, and then remove the power packs to be free of the excess weight during the race.
While the present invention has been described in terms of a preferred embodiment, it is not so limited. Many additions, deletions and modifications may be made to the preferred embodiment wi'hout departing from he spirit and scope of the claimed invention. For example, a non-rechargeable power source may be used; 'he anchor and anchor receptacle locations might be interchanged between the boot assembly and power pack assembly; other designs of resilient contacts are usable; and more.
:
, ~ ,
Claims (27)
1. A universal heating system for ski boots, comprising:
a boot assembly, including a heating element for disposition inside a ski boot and electrically connected to contact post means in boot anchor means securable to said ski boot, said boot anchor means including first mechanical connection means associated with said contact post means; and a power pack assembly, including a case containing an electrical energy source electrically connected to contact means selectively electrically contactable with said contact post means when said power pack assembly is secured to said boot anchor means, and second mechanical connection means matingly engageable with said first mechanical connection means.
a boot assembly, including a heating element for disposition inside a ski boot and electrically connected to contact post means in boot anchor means securable to said ski boot, said boot anchor means including first mechanical connection means associated with said contact post means; and a power pack assembly, including a case containing an electrical energy source electrically connected to contact means selectively electrically contactable with said contact post means when said power pack assembly is secured to said boot anchor means, and second mechanical connection means matingly engageable with said first mechanical connection means.
2. The system of claim 1, wherein said first and second mechanical connection means are longitudinally and rotationally engageable.
3. The system of claim 2, wherein said first and second engageable mechanical connection means are resiliently biased when longitudinally engaged and resiliently held together when rotationally engaged.
4. The system of claim 3, wherein said resiliently biased and held mechanical connection means include at least one locking position wherein said system remains inoperative, and at least one switching position wherein an electrical circuit between said heating element and said energy source is completed.
5. The system of claim 4, wherein said contact post means is resiliently contacted by said contact means in said switching position of said engaged mechanical connection means.
6. The system of claim 2, wherein one of said first and said second mechanical connection means comprises lugs, and the other of said first and said second mechanical connection means comprises mating slots.
7. The system of claim 6, wherein said slots are at the periphery of a boot anchor aperture opening into an anchor receptacle wherein are disposed said contact means and spring means to provide said resilient biasing.
8. The system of claim 7, further including a detent on one of said lugs, and at least one locking recess and at least one switching recess engageable with said lug detent on the interior of said anchor receptacle.
9. The system of claim 8, wherein said at least one locking recess and said switching recess are rotationally disposed substantially 90° apart.
10. The system of claim 9, wherein there are two locking recesses diametrically opposed across said boot anchor aperture and said switching recess is rotationally located substantially 90° from each locking recess.
11. The system of claim 7, further including a track surrounding said boot anchor aperture, said track including a plurality of gaps to provide, when engaged with one of said lugs, at least one locking position between said boot anchor means and said power pack assembly wherein said heating element remains inoperative, and at least one switching position therebetween wherein said heating element is provided with power from said electrical energy source.
12. The system of claim 11, wherein the height of said track is less between said at least one locking position and said at least one switching position than between said at least one locking position and an entry position wherein said lugs and slots are aligned.
13. The system of claim 11, wherein said at least one locking position and said at least one switching recess are rotationally disposed substantially 90°
apart.
apart.
14. The system of claim 13, wherein there are two primary locking position gaps diametrically opposed across said boot anchor aperture and a switching position gap rotationally located substantially 90°
from each locking position gap.
from each locking position gap.
15. The system of claim 1, further including water seal means activated by engagement of said first and second mechanical connection means.
16. The system of claim 15, wherein said water seal means is compressed between said case and a flange on said boot anchor.
17. The system of claim 15, wherein said seal means is disposed on the interior of said case and surrounds a portion of said boot anchor when said first and second mechanical connection means are longitudinally engaged.
18. The system of claim 1, wherein said heating element includes a resistance circuit thereon adapted to be adhesively affixed to a boot insole on the toe area thereof, said insole being disposed inside an inner boot shell of said ski boot.
19. The system of claim 18, wherein said heating element further includes electrical conductor means extending over the toe of said insole and at least partially along the underside thereof prior to exiting the interior of said inner shell and extending between said inner shell and said ski boot to con act pin means frictionally engageable with said contact post means.
20. The system of claim 19, wherein said contact pin means extend through the wall of said ski boot into said contact post means.
21. A universal heating system for footwear, comprising:
a first assembly including a heating element for disposition inside an article of footwear and electrically connectable to first contact means associated with anchor means adapted for attachment to the exterior of said article of footwear, said anchor means including first mechanical connection means;
a second assembly including a housing containing an electrical energy source electrically connected to second contact means selectively electrically contactable with said first contact means when said second assembly is secured to said first assembly, and second mechanical connection means engageable with said first mechanical connection means.
a first assembly including a heating element for disposition inside an article of footwear and electrically connectable to first contact means associated with anchor means adapted for attachment to the exterior of said article of footwear, said anchor means including first mechanical connection means;
a second assembly including a housing containing an electrical energy source electrically connected to second contact means selectively electrically contactable with said first contact means when said second assembly is secured to said first assembly, and second mechanical connection means engageable with said first mechanical connection means.
22. The system of claim 21, wherein engagement of said first and second mechanical connection means permits rotation of said second assembly relative to said first assembly.
23. The system of claim 22, wherein said first and second contact means are selectably contactable through said rotation.
24. The system of claim 21, further including biasing means for resiliently forcing said first and second assemblies toward each other after mutual engagement thereof.
25. The system of claim 24, wherein engagement of said first and second mechanical connection means permits rotation of said second assembly relative to said first assembly after longitudinal movement of said assemblies away from each other in opposition to said biasing means.
26. The system of claim 25, wherein said first and second contact means are selectively contactable through said rotation.
27. The system of claim 26, further including locking means to lock said first and second contact means in contact in cooperation with said biasing means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/418,840 US5041717A (en) | 1989-10-10 | 1989-10-10 | Universal ski boot heater |
| US07/418,840 | 1989-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2067165A1 true CA2067165A1 (en) | 1991-04-11 |
Family
ID=23659758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002067165A Abandoned CA2067165A1 (en) | 1989-10-10 | 1990-10-09 | Universal ski boot heater |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5041717A (en) |
| EP (1) | EP0495010A4 (en) |
| JP (1) | JPH05501974A (en) |
| CA (1) | CA2067165A1 (en) |
| WO (1) | WO1991005490A1 (en) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6727469B1 (en) * | 2002-11-22 | 2004-04-27 | April F. Parker | Heated booty |
| GB0312552D0 (en) * | 2003-06-02 | 2003-07-09 | Nel Technologies Ltd | Functional therapeutic corporeal and wound dressing heaters |
| GB0312551D0 (en) * | 2003-06-02 | 2003-07-09 | Nel Technologies Ltd | Functional electro-conductive garments |
| GB0312553D0 (en) * | 2003-06-02 | 2003-07-09 | Nel Technologies Ltd | Functional heater for formed components |
| GB0312550D0 (en) * | 2003-06-02 | 2003-07-09 | Nel Technologies Ltd | Functional insole heater for footwear |
| US7328370B2 (en) * | 2003-09-12 | 2008-02-05 | Rockwell Automation Technologies, Inc. | Safety controller with simplified interface |
| US7810434B2 (en) * | 2007-05-16 | 2010-10-12 | Allison Flom | Heated ski lift |
| US20090032517A1 (en) * | 2007-08-01 | 2009-02-05 | Michael Dominic Sopuch | Ski integrated solar power system |
| US8087186B2 (en) * | 2008-03-13 | 2012-01-03 | Omnitek Partners Llc | Piezoelectric-based toe-heaters for frostbite protection |
| US8850716B2 (en) | 2010-12-28 | 2014-10-07 | Schawbel Technologies Llc | Heated insole remote control systems |
| EP2797456B8 (en) | 2011-12-30 | 2020-03-25 | Schawbel Technologies LLC | Heated insoles |
| CN104203028A (en) * | 2012-02-09 | 2014-12-10 | 田桐旻 | Customized shoe insole and customized sandal |
| US9572397B2 (en) | 2013-12-04 | 2017-02-21 | Schawbel Technologies Llc | Heated insole with removable assembly |
| EP3076820B2 (en) | 2013-12-04 | 2021-11-10 | Schawbel Technologies LLC | Heated insole with removable and rechargeable battery |
| US9314064B2 (en) | 2013-12-04 | 2016-04-19 | Schawbel Technologies Llc | Heated insole with removable heating assembly |
| USD737769S1 (en) | 2014-04-09 | 2015-09-01 | Schawbel Technologies Llc | Battery pack for an insole |
| USD734012S1 (en) | 2014-04-09 | 2015-07-14 | Schawbel Technologies Llc | Insole |
| USD738995S1 (en) | 2014-08-28 | 2015-09-15 | Schawbel Technologies Llc | Device for cooling or heating |
| USD747810S1 (en) | 2014-08-28 | 2016-01-19 | Schawbel Technologies Llc | Device for cooling or heating |
| DE202014104392U1 (en) | 2014-09-16 | 2014-10-27 | Li-Te Chin | Composable, flexible iontophoresis heater |
| USD794813S1 (en) | 2015-07-15 | 2017-08-15 | Schawbel Technologies Llc | Heat pack |
| US11047706B2 (en) * | 2016-02-01 | 2021-06-29 | One Two Free Inc. | Pedometer with accelerometer and foot motion distinguishing method |
| CA3092212A1 (en) | 2018-02-26 | 2019-08-29 | Ts Medical Llc | Devices and methods for exercising an ankle, foot, and/or leg |
| US11638852B2 (en) | 2018-04-06 | 2023-05-02 | TS Medical, LLC | Portable devices for exercising muscles in the ankle, foot, and/or leg, and related methods |
| CA3055361A1 (en) | 2018-09-14 | 2020-03-14 | Mary Anne Tarkington | Portable devices for exercising muscles in the ankle, foot, and/or leg, and related methods |
| USD961023S1 (en) | 2020-02-12 | 2022-08-16 | TS Medical, LLC | Excercise device |
| USD1012207S1 (en) | 2020-08-12 | 2024-01-23 | TS Medical, LLC | Exercise device |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE146353C (en) * | ||||
| GB190808148A (en) * | 1908-04-13 | 1909-03-04 | Otto Krueger | Electric Foot-warmer. |
| US1275451A (en) * | 1917-11-02 | 1918-08-13 | Ernest John King | Warmer for footwear. |
| US2025950A (en) * | 1934-07-05 | 1935-12-31 | Kurtz Andrew | Foot warming device |
| US2692326A (en) * | 1952-11-15 | 1954-10-19 | Henry M Crowell | Electrically heated shoe |
| US3663796A (en) * | 1970-03-04 | 1972-05-16 | Timely Products Corp | Electrically heated boot sock and battery supporting pouch therefor |
| US3946193A (en) * | 1973-11-15 | 1976-03-23 | Giese Erik O | Heated inner sole and battery case for use in boot construction |
| US3859496A (en) * | 1973-11-15 | 1975-01-07 | Comfort Prod Inc | Heated inner sole and battery case for use in boot construction |
| US3977093A (en) * | 1976-01-19 | 1976-08-31 | The Raymond Lee Organization, Inc. | Cold weather shoe |
| US4080971A (en) * | 1976-07-30 | 1978-03-28 | Rory Ann Leeper | Battery powered foot warming insole |
| US4279255A (en) * | 1980-02-26 | 1981-07-21 | John F. Taylor | Localized body heat applicator device |
| DE3379634D1 (en) * | 1982-01-22 | 1989-05-24 | Nordica Spa | Heater device, particularly for ski boots |
| IT8522141V0 (en) * | 1985-06-11 | 1985-06-11 | Nordica Spa | INCORPORATING FOOTWEAR STRUCTURE A HEATING DEVICE, PARTICULARLY FOR SKI BOOTS. |
| US4937494A (en) * | 1986-03-31 | 1990-06-26 | North American Philips Corporation | High pressure discharge lamp having an electrode lead-through with a positioning crimp |
| IT209335Z2 (en) * | 1986-06-30 | 1988-09-20 | Nordica Spa | HEATING DEVICE, PARTICULARLY FOR SKI SHOES. |
| IT208028Z2 (en) * | 1986-07-03 | 1988-03-31 | Dolomite Spa | HEATING DEVICE FOR SKI SHOES |
| FR2602959B1 (en) * | 1986-08-19 | 1989-05-05 | Salomon Sa | LOGE HEATING DEVICE IN A CLOTHING OR FOOTWEAR, ESPECIALLY A SKI SHOE |
| IT1220015B (en) * | 1987-11-03 | 1990-06-06 | Nordica Spa | HEATING DEVICE FOR FOOTWEAR, IN PARTICULAR FOR SKI BOOTS |
| US4948951A (en) * | 1989-01-03 | 1990-08-14 | Alfiero Balzano | Heater employing flexible circuitry |
| US4950858A (en) * | 1989-04-25 | 1990-08-21 | Stephen Slenker | Boot heater |
-
1989
- 1989-10-10 US US07/418,840 patent/US5041717A/en not_active Expired - Lifetime
-
1990
- 1990-10-09 EP EP19910900592 patent/EP0495010A4/en not_active Withdrawn
- 1990-10-09 CA CA002067165A patent/CA2067165A1/en not_active Abandoned
- 1990-10-09 JP JP2515849A patent/JPH05501974A/en active Pending
- 1990-10-09 WO PCT/US1990/005771 patent/WO1991005490A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991005490A1 (en) | 1991-05-02 |
| EP0495010A4 (en) | 1992-09-09 |
| EP0495010A1 (en) | 1992-07-22 |
| US5041717A (en) | 1991-08-20 |
| JPH05501974A (en) | 1993-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |