EP2153945A1 - Self-Jacking mobile saw stand - Google Patents
Self-Jacking mobile saw stand Download PDFInfo
- Publication number
- EP2153945A1 EP2153945A1 EP08014265A EP08014265A EP2153945A1 EP 2153945 A1 EP2153945 A1 EP 2153945A1 EP 08014265 A EP08014265 A EP 08014265A EP 08014265 A EP08014265 A EP 08014265A EP 2153945 A1 EP2153945 A1 EP 2153945A1
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- European Patent Office
- Prior art keywords
- power tool
- bed
- stand
- support
- strut
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- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/02—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby of table type
- B25H1/04—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby of table type portable
Definitions
- the invention relates to mobile stands for powered tools. More specifically, the invention relates to mobile stands for power tools such as miter saws, chop saws, task saws, compound sliding circular saws and the like.
- a brochure showing the Rousseau SS2850 product discloses a mobile miter saw stand.
- United States Patent No. 6,886,836 entitled “Counterbalanced Universal Mobile Saw Stand,” issued May 3,2005 to the inventor herein discloses a built-in handtruck design that enables the end user to transport common table saws and equipment to the location of the project being undertaken. The unit quickly folds out into a fully supporting work bench for actual use of the saw and/or equipment.
- the saw stand shown in the'836 patent is a significant advance in the art in that the device disclosed therein permits a heavy power saw, such as a table saw to be transported to or from a jobsite on roller wheels in the manner of a conventional handtruck.
- the saw can then be used with the saw stand in a collapsed position (e.g., low to the ground) or in a raised position at table height.
- This saw stand has a built-in feature that enables the unit to stand in the vertical position with the saw attached. This creates ease in transporting the unit to and from the workplace, i.e., in elevators, truck beds, etc. Also built into the design is the ability to use the saw in the horizontal stowed position for hardwood floor installers, etc.
- This unit is constructed of powder-coated tubular steel and sheet metal. Ergonomic handles and lockout devices are incorporated into each aspect of this unit for ease of use, safety, and product longevity.
- Quick automatic latch mechanisms are an integral part of the unit for the flip-out support leg and the saw table surface. These latches are automatic in the setup mode and require manual release for returning the unit to the stowed position.
- the stand includes an elongated power tool bed having two ends for supporting a power tool, or an intermediate plate to which a power tool, such as a table saw, chop saw, band saw, or the like may be attached.
- the stand has a substantially handtruck-shaped bed support having an upper end slidably connected to the power tool bed, such as by a track or pair of tracks.
- the bed support has an intermediate lever arm portion; and a distal foot portion having a preselected length terminating in a free end and forming a preselected foot portion angle with respect to the lever arm portion.
- the bed support is movable between stowed and extended positions with respect to the power tool bed.
- a swing-out leg, or pair of swing-out legs have upper ends pivotally connected adjacent to the power tool bed first end. Each leg has a distal free end for contacting a substantially planar surface, such as the ground.
- the leg or legs are pivotable between stowed and extended positions with respect to the power tool bed.
- a strut or struts having first end(s) pivotally connected adjacent the power tool bed first end have second distal ends pivotally connected to the bed support so as to be pivotal between stowed and extended positions.
- a wheel or pair of wheels having a preselected radius are rotatably connected to the bed support for rolling the stand on the support surface when the bed support, strut or struts, and leg or legs are locked into their respective stowed positions in the conventional manner of a handtruck.
- the wheels are lifted from the support surface, such as the ground, and the stand is primarily supported by the leg or legs and the foot portion free end. In this manner, the vibrations from the power tool on the power tool bed are transmitted directly into the support surface and are damped thereby.
- the bed interior angles between the power tool bed, bed support, and struts are acute angles and the free end of the lever arm foot portion is positioned at a distance d from a diameter of the wheel normal to the support surface along a tangent to the wheel in contact with the support surface wherein d is equal to or greater than approximately the radius of the wheel R and approximately equal to or less than R/tan (90° minus the acute angle between the power tool bed and bed support).
- the intermediate lever arm portion of the bed support when advanced toward the second end of the power tool bed and past the vertical, acts as a lever to "jack up" the wheel or wheels off the support surface (e.g., ground) with minimal effort in an over-center fashion.
- the weight of the power tool on top of the bed support assists in the self-jacking operation.
- biasing mechanisms may be interconnected between the strut or struts and the power tool bed to facilitate erection of the stand with a heavy load on the bed support, such as a power tool or the like.
- the acute angle between the power tool bed and the intermediate lever arm portion of the bed support is approximately 75 degrees when extended, and the preselected angle between the intermediate lever arm portion of the bed support and the foot portion is approximately 90 degrees, as in a conventional two-wheeled handtruck.
- a self-jacking mobile power tool stand in accordance with the principles of the invention is generally indicated at reference numeral 10 in the various Figures of the attached drawings, wherein numbered elements in the Figures correspond to like numbered elements herein.
- Figures 1 and 2 generally show the stand 10 in an extended or raised position for use of the stand at table height
- Figure 4 illustrates the stand 10 in a collapsed position for transporting a powered tool 11, such as a table saw, chop saw, sliding compound miter saw or the like, in a handtruck-like fashion, or for use of the powered tool at a low elevation, such as for carpentry work involving floor moldings and the like.
- the power tool stand 10 includes an elongated, power tool bed 12 having a first end 14 and a second end 16 for supporting a power tool or the like on a removable saw mounting plate 18 shown in Figure 7 .
- the power tool such as a table saw
- the power tool is mounted to the plate 18 by conventional bolts (not shown) or the like while the plate itself is received in a clip 20 and a spring-loaded latch 22 on a top side 24 of the bed 12.
- the latch 22 has a handle 26 that may be operated by the user to release the latch and remove the plate 18 from the bed 12. In this way a user may decouple the saw/plate combination from the collapsed stand 10 to lighten lifting requirements for loading the equipment in a pickup truck bed or the like.
- the plate 18 is provided with hand held recesses 28 adjacent to each corner of the plate.
- a pair of swing-out legs 30, 32 connected by crossbraces 34 have upper ends 36 pivotally connected to the first end 14 of the power tool bed 12.
- the legs have distal free ends 38 capped by rubber feet for contact with a support surface 40, such as the ground.
- the power tool stand 10 also has a pair of struts 48, 50 each having a first end 52 also pivotally connected to the power tool bed first end 14 coaxially with the swing-out legs 32, 34, such as about a tool bed axle 54, best seen in Figure 6 .
- the first ends 52 of the struts have perpendicularly extending handle portions 60, 62 interconnected by a handle crossbar 63 that also serves as a handle correlating to the handle on a conventional two-wheeled handtruck, as will be described further hereinbelow.
- the struts also each have a distal second end 64 that is pivotally connected by a wheel axle 66 to a generally "L"-shaped or handtruck-shaped bed support generally indicated at reference numeral 70.
- the bed support has a pair of intermediate lever arm portions 72, 74 each having an upper part 76 and lower part 78 connected at an obtuse angle so that the various parts of the stand may stow together closely as shown in Figure 4 without mechanical interference.
- each lever arm portion is provided with a roller 82, (best seen in Figure 5 ) that is received in an interior track 84 connected to the underside of the power tool bed 12.
- the track 84 extends from the second end 16 of the power tool bed 12 approximately midway toward the first end 14.
- the track 84 is provided with an upward detent or groove 90 to receive the rollers 82 at the distal end of the track such that the rollers are captured therein by the gravitational bias of the power tool bed 12 and the power tool received on top of the bed.
- the intermediate lever arm portions 72, 74 are provided with a perpendicularly extending foot portion 92 terminating in a foot portion free end 94 in the form of a cylindrical, transverse bar 96.
- the wheel axle 66 is journalled through the lower parts 78 of the lever arm portions 72, 74 so as to support a pair of wheels 100 laterally external to the struts 48, 50.
- the handle portions 60, 62 and pair of wheels 100 support the power tool stand 10 on the support surface 40 when the saw stand is in the collapsed position; however, when the stand is in the extended or erect position shown in Figure 2 , the stand is primarily supported by the pair of swing-out legs 30, 32 and the free end 94 of the lever arm foot portion 92 so as to isolate the wheels 100 from the ground. In this manner, vibrations from the power tool or the like on the saw plate 18 are transmitted directly through the saw stand to the ground, rather than being introduced into the wheels, which may serve to reflect and/or amplify those vibrations.
- a pair of spring-loaded hydraulic cylinders 110 are preferably pivotally connected to both the power tool bed 12 and one of each of the struts 48, 50. Furthermore, as shown with reference to the freebody diagram shown in Figure 3 , a preferred geometry is selected for the power tool stand 10 such that an acute angle ⁇ is formed between the power tool bed 12 and the struts 48, 50 when the stand 10 is in the extended or erect position.
- the bed 12 and lever arm portions 72, 74 preferably form an acute angle ⁇ therebetween such that the upper ends 80 of the lever arm portions are beyond a normal line 120 with respect to the support surface or ground 40 in the manner of an overcenter latch to assist the user when drawing the upper part 76 of the lever arm portions 72, 74 toward the second end 16 of the power tool bed 12.
- the user achieves this action merely by lifting the second end 16 of the power tool bed 12 after the swing-out legs 30, 32 have been deployed such that the hydraulic cylinders 110 assist in raising the bed.
- the weight of the table saw or the like on the power tool bed 12 assists in driving the upper parts 76 of the lever arms 72, 74 to the positions shown in Figures 2 and 3 (i.e., to the right is shown in Figures 1 and 2 ).
- the lever arm portions 72, 74 preferably have a length approximately 2.5 times that of the length 1 of the foot portion 92 such that only 40% of the weight on the power tool bed 12 is required to "jack" the free end 94 of the foot portion 92 into the position shown in Figure 2 , wherein the wheels 100 are lifted from the support surface or floor 40.
- the free end 94 of the foot portion 92 should have a length 1 selected such that the distance d is in the range of approximately between the radius R of the wheels 100 divided by the tangent of ⁇ .
- the angle ⁇ is approximately equal to 35 degrees; and the angle ⁇ is approximately equal to 75 degrees.
- an angle ⁇ between the struts 48, 50 and the lever arm portions 72, 74, as shown in Figure 3 is approximately 70 degrees.
- ⁇ being equal to 90 degrees - ⁇ is approximately 15 degrees and the distance 1, as shown in Figure 3 , is approximately 23.18 inches if the radius R of the wheels 100 is approximately 6 inches.
- the foot portion 92 is displaced downwardly from the wheel axle 66 by approximately 2.17 inches; thus, using the above formulas the foot portion 92 has approximately a length of 14.8 inches.
- Figure 3 is a freebody diagram of the structure shown in Figure 2 .
- the foot portion free end 94 has a cylindrical transverse bar 96 having a nonzero diameter.
- Transverse bar 96 has a diameter of approximately 1.38 inch.
- the mobile power tool stand 10 may optionally be provided with infeed and outfeed rollers of the conventional type 122, 124 located laterally by transverse bars 126, 127 that in turn are received in square cross-section tubes 128 that are integral with the power tool bed 12.
- the rollers are supported in the conventional manner by telescoping support members 130 and 132.
- the second end 16 of the power tool bed 12 is preferably provided with a spring-loaded axle latch 140 to secure the wheel axle 100 to the power tool bed 12 when in the collapsed position shown in Figure 4 .
- the self-jacking, mobile power tool stand 10 shown and described above provides a means for supporting a conventional power tool, such as a table saw or chop saw in a waist-height position, as shown in Figure 2 , such that the transport wheels 100 are lifted off the ground 40 to reduce vibrations during operation.
- the stand 10 may be collapsed and locked by the axle latch 140 and as shown in Figure 4 , to permit the power tool, such as a table saw, to be used at floor level, for example, for carpentry work involving floor moldings.
- the mobile power tool stand when in the collapsed position shown in Figure 4 may also be used to transport the power tool in a fashion similar to a conventional two-wheeled handtruck.
- the saw mounting plate 18 may be detached from the power tool bed 12 by operation of the latch 22 and the combination power tool/mounting plate laid on the foot portion 92 and transported in the conventional two-wheeled handtruck fashion
Abstract
Description
- The invention relates to mobile stands for powered tools. More specifically, the invention relates to mobile stands for power tools such as miter saws, chop saws, task saws, compound sliding circular saws and the like.
- Portable, wheeled tool carts have been available for some time. One such prior art tool cart is shown and described by Wise, the inventor herein, in
U.S. Patent No. 5,642,898 issued July 1, 1997 . Additional tool carts have been described in the patent literature. For instance,U.S. Patent No. 4,955,941, issued September 11, 1990, to Rousseau , describes a support table for a bench saw.U.S. Patent No. 4,230,329, issued October 28, 1980 to Johnson , describes a mobile cart.U.S. Patent No. 5,161,590, issued November 10, 1992, to Otto , describes a miter saw table apparatus.U.S. Patent No. 5,255,724; issued October 26, 1993, to Butke , describes an adjustable extension assembly. A brochure showing the Rousseau SS2850 product discloses a mobile miter saw stand. United States Patent No.6,886,836 entitled "Counterbalanced Universal Mobile Saw Stand," issued May 3,2005 to the inventor herein discloses a built-in handtruck design that enables the end user to transport common table saws and equipment to the location of the project being undertaken. The unit quickly folds out into a fully supporting work bench for actual use of the saw and/or equipment. The saw stand shown in the'836 patent is a significant advance in the art in that the device disclosed therein permits a heavy power saw, such as a table saw to be transported to or from a jobsite on roller wheels in the manner of a conventional handtruck. The saw can then be used with the saw stand in a collapsed position (e.g., low to the ground) or in a raised position at table height. This saw stand has a built-in feature that enables the unit to stand in the vertical position with the saw attached. This creates ease in transporting the unit to and from the workplace, i.e., in elevators, truck beds, etc. Also built into the design is the ability to use the saw in the horizontal stowed position for hardwood floor installers, etc. - This unit is constructed of powder-coated tubular steel and sheet metal. Ergonomic handles and lockout devices are incorporated into each aspect of this unit for ease of use, safety, and product longevity. Quick automatic latch mechanisms are an integral part of the unit for the flip-out support leg and the saw table surface. These latches are automatic in the setup mode and require manual release for returning the unit to the stowed position.
- One disadvantage of this prior art design, as well as other prior art designs discussed above, is that when the saw stand is in the extended or raised position, a significant part of the load is borne by the wheels. On a smooth, flat surface (e.g., a garage floor, hardwood floors, etc.) vibrations from the saw tend to cause minor movement in the wheels, thus allowing undesirable vibrations to become amplified through positive feedback and reverberate through the saw stand.
- Thus, a need exists for a mobile, collapsible power tool stand that can roll on wheels, but that also lifts the saw stand off the wheels when erected or extended.
- It is therefore an object of the present invention to provide a collapsible mobile power tool stand, such as a saw stand that permits the power tool or saw to be rolled to and from a jobsite on wheels in a handtruck-like design.
- It is a further object of the present invention to provide a mobile power tool stand that achieves the above object and which also lifts the power tool stand off the wheels when the stand is erected or extended.
- It is yet another object of the present invention to provide for a power tool stand that achieves the above objects and which also facilitates self-erection of the saw stand with application of minimal physical force by the user, even with a heavy power tool, such as a table saw, attached to the stand.
- The invention achieves the above objects, and other objects and advantages that will become apparent from the description which follows, by providing a collapsible, self-jacking mobile power tool stand. The stand includes an elongated power tool bed having two ends for supporting a power tool, or an intermediate plate to which a power tool, such as a table saw, chop saw, band saw, or the like may be attached. The stand has a substantially handtruck-shaped bed support having an upper end slidably connected to the power tool bed, such as by a track or pair of tracks. The bed support has an intermediate lever arm portion; and a distal foot portion having a preselected length terminating in a free end and forming a preselected foot portion angle with respect to the lever arm portion. The bed support is movable between stowed and extended positions with respect to the power tool bed. A swing-out leg, or pair of swing-out legs have upper ends pivotally connected adjacent to the power tool bed first end. Each leg has a distal free end for contacting a substantially planar surface, such as the ground. The leg or legs are pivotable between stowed and extended positions with respect to the power tool bed. A strut or struts having first end(s) pivotally connected adjacent the power tool bed first end have second distal ends pivotally connected to the bed support so as to be pivotal between stowed and extended positions. A wheel or pair of wheels having a preselected radius are rotatably connected to the bed support for rolling the stand on the support surface when the bed support, strut or struts, and leg or legs are locked into their respective stowed positions in the conventional manner of a handtruck.
When the bed support, strut or struts, and leg or legs are in their extended positions, the wheels are lifted from the support surface, such as the ground, and the stand is primarily supported by the leg or legs and the foot portion free end. In this manner, the vibrations from the power tool on the power tool bed are transmitted directly into the support surface and are damped thereby. - In its preferred embodiment, the bed interior angles between the power tool bed, bed support, and struts are acute angles and the free end of the lever arm foot portion is positioned at a distance d from a diameter of the wheel normal to the support surface along a tangent to the wheel in contact with the support surface wherein d is equal to or greater than approximately the radius of the wheel R and approximately equal to or less than R/tan (90° minus the acute angle between the power tool bed and bed support). In this way, the intermediate lever arm portion of the bed support, when advanced toward the second end of the power tool bed and past the vertical, acts as a lever to "jack up" the wheel or wheels off the support surface (e.g., ground) with minimal effort in an over-center fashion. Thus, the weight of the power tool on top of the bed support assists in the self-jacking operation. Furthermore, biasing mechanisms may be interconnected between the strut or struts and the power tool bed to facilitate erection of the stand with a heavy load on the bed support, such as a power tool or the like. In the preferred embodiment, the acute angle between the power tool bed and the intermediate lever arm portion of the bed support is approximately 75 degrees when extended, and the preselected angle between the intermediate lever arm portion of the bed support and the foot portion is approximately 90 degrees, as in a conventional two-wheeled handtruck.
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Figure 1 is a perspective, environmental view of a self-jacking mobile power tool stand in the extended position supporting an exemplary chop saw. -
Figure 2 is a side elevational view of the stand shown inFigure 1 . -
Figure 3 is a freebody diagram of the essential structural elements, and angular relationship therebetween shown inFigure 2 . -
Figure 4 is a side elevational view of the stand shown inFigure 1 in a collapsed and/or stowed position. -
Figure 5 is a sectional view taken along line 5-5 ofFigure 4 . -
Figure 5A is an enlarged view of circledarea 5A inFigure 5 . -
Figure 5B is an enlarged, sectional view of circledarea 5B inFigure 5 . -
Figure 6 is a partial, top plan view of a first end of the stand in the collapsed position. -
Figure 7 is a bottom plan view of a saw mounting plate for use with the mobile power tool stand. - A self-jacking mobile power tool stand in accordance with the principles of the invention is generally indicated at
reference numeral 10 in the various Figures of the attached drawings, wherein numbered elements in the Figures correspond to like numbered elements herein.Figures 1 and2 generally show thestand 10 in an extended or raised position for use of the stand at table height, whereasFigure 4 illustrates thestand 10 in a collapsed position for transporting a powered tool 11, such as a table saw, chop saw, sliding compound miter saw or the like, in a handtruck-like fashion, or for use of the powered tool at a low elevation, such as for carpentry work involving floor moldings and the like. - With reference to
Figures 1 and2 , thepower tool stand 10 includes an elongated,power tool bed 12 having afirst end 14 and asecond end 16 for supporting a power tool or the like on a removablesaw mounting plate 18 shown inFigure 7 . The power tool, such as a table saw, is mounted to theplate 18 by conventional bolts (not shown) or the like while the plate itself is received in aclip 20 and a spring-loadedlatch 22 on atop side 24 of thebed 12. Thelatch 22 has ahandle 26 that may be operated by the user to release the latch and remove theplate 18 from thebed 12. In this way a user may decouple the saw/plate combination from the collapsedstand 10 to lighten lifting requirements for loading the equipment in a pickup truck bed or the like. To this end, theplate 18 is provided with hand heldrecesses 28 adjacent to each corner of the plate. - A pair of swing-out
legs crossbraces 34 have upper ends 36 pivotally connected to thefirst end 14 of thepower tool bed 12. The legs have distal free ends 38 capped by rubber feet for contact with asupport surface 40, such as the ground. The power tool stand 10 also has a pair ofstruts first end 52 also pivotally connected to the power tool bedfirst end 14 coaxially with the swing-outlegs tool bed axle 54, best seen inFigure 6 . The first ends 52 of the struts have perpendicularly extendinghandle portions handle crossbar 63 that also serves as a handle correlating to the handle on a conventional two-wheeled handtruck, as will be described further hereinbelow. The struts also each have a distalsecond end 64 that is pivotally connected by awheel axle 66 to a generally "L"-shaped or handtruck-shaped bed support generally indicated atreference numeral 70. The bed support has a pair of intermediatelever arm portions upper part 76 andlower part 78 connected at an obtuse angle so that the various parts of the stand may stow together closely as shown inFigure 4 without mechanical interference. Anupper end 80 of each lever arm portion is provided with aroller 82, (best seen inFigure 5 ) that is received in aninterior track 84 connected to the underside of thepower tool bed 12. As best seen inFigure 2 , thetrack 84 extends from thesecond end 16 of thepower tool bed 12 approximately midway toward thefirst end 14. Thetrack 84 is provided with an upward detent or groove 90 to receive therollers 82 at the distal end of the track such that the rollers are captured therein by the gravitational bias of thepower tool bed 12 and the power tool received on top of the bed. The intermediatelever arm portions foot portion 92 terminating in a foot portionfree end 94 in the form of a cylindrical,transverse bar 96. Thewheel axle 66 is journalled through thelower parts 78 of thelever arm portions wheels 100 laterally external to thestruts - As best seen in
Figure 4 , thehandle portions wheels 100 support the power tool stand 10 on thesupport surface 40 when the saw stand is in the collapsed position; however, when the stand is in the extended or erect position shown inFigure 2 , the stand is primarily supported by the pair of swing-outlegs free end 94 of the leverarm foot portion 92 so as to isolate thewheels 100 from the ground. In this manner, vibrations from the power tool or the like on thesaw plate 18 are transmitted directly through the saw stand to the ground, rather than being introduced into the wheels, which may serve to reflect and/or amplify those vibrations. - In order to provide the self-jacking function described above, a pair of spring-loaded
hydraulic cylinders 110 are preferably pivotally connected to both thepower tool bed 12 and one of each of thestruts Figure 3 , a preferred geometry is selected for the power tool stand 10 such that an acute angle α is formed between thepower tool bed 12 and thestruts stand 10 is in the extended or erect position. Thebed 12 andlever arm portions normal line 120 with respect to the support surface orground 40 in the manner of an overcenter latch to assist the user when drawing theupper part 76 of thelever arm portions second end 16 of thepower tool bed 12. The user achieves this action merely by lifting thesecond end 16 of thepower tool bed 12 after the swing-outlegs hydraulic cylinders 110 assist in raising the bed. Once the rollers 82 (and hence theupper end 80 of eachlever arm portion 72, 74) have passed the vertical 120, the weight of the table saw or the like on thepower tool bed 12 assists in driving theupper parts 76 of thelever arms Figures 2 and3 (i.e., to the right is shown inFigures 1 and2 ). Furthermore, thelever arm portions foot portion 92 such that only 40% of the weight on thepower tool bed 12 is required to "jack" thefree end 94 of thefoot portion 92 into the position shown inFigure 2 , wherein thewheels 100 are lifted from the support surface orfloor 40. It can be shown through the use of the geometric laws, including the law of similar triangles, complementary angles, and the like, that the angle θ between thelever arm portion normal line 120 is equal to 90 degrees - β and that the angle between thefoot portion 92 and the ground orsupport surface 40 is also θ. Thus, by trigonometry it can be stated that, when thewheels 100 are in contact with the support surface orground 40, thefree end 94 of thefoot portion 92 will be at a distance d equal to the radius of the wheel R divided by the tangent of the angle θ. It has been determined that, if the angle between the intermediatelever arm portions foot portion 92 is approximately a right angle, thefree end 94 of thefoot portion 92 should have a length 1 selected such that the distance d is in the range of approximately between the radius R of thewheels 100 divided by the tangent of θ. As shown inFigure 2 , however, if thelower part 78 of eachlever arm portion foot portion 92 is modified according to the formula: - In the preferred embodiment of the invention, the angle α is approximately equal to 35 degrees; and the angle β is approximately equal to 75 degrees. Thus, an angle γ between the
struts lever arm portions Figure 3 , is approximately 70 degrees. Thus, θ being equal to 90 degrees - β is approximately 15 degrees and the distance 1, as shown inFigure 3 , is approximately 23.18 inches if the radius R of thewheels 100 is approximately 6 inches. However, as shown inFigure 2 , thefoot portion 92 is displaced downwardly from thewheel axle 66 by approximately 2.17 inches; thus, using the above formulas thefoot portion 92 has approximately a length of 14.8 inches. - As stated above,
Figure 3 is a freebody diagram of the structure shown inFigure 2 . As shown inFigure 2 , the foot portionfree end 94 has a cylindricaltransverse bar 96 having a nonzero diameter.Transverse bar 96 has a diameter of approximately 1.38 inch. Thus, utilizing the dimensions and angles discussed above, thewheel 100 will be raised 0.69 inch off the support surface orground 40 when all of the relevant elements are in their extended position, as shown inFigures 1 and2 . These dimensions and angles have been determined to be optimal to raise thewheels 100 out of contact with the ground while maintaining a low required lifting force to raise thepower tool bed 12 to its extended position. - The mobile power tool stand 10 may optionally be provided with infeed and outfeed rollers of the
conventional type transverse bars square cross-section tubes 128 that are integral with thepower tool bed 12. The rollers are supported in the conventional manner by telescopingsupport members second end 16 of thepower tool bed 12 is preferably provided with a spring-loadedaxle latch 140 to secure thewheel axle 100 to thepower tool bed 12 when in the collapsed position shown inFigure 4 . - In view of the above, it will be apparent to those of ordinary skill in the art that the self-jacking, mobile power tool stand 10 shown and described above provides a means for supporting a conventional power tool, such as a table saw or chop saw in a waist-height position, as shown in
Figure 2 , such that thetransport wheels 100 are lifted off theground 40 to reduce vibrations during operation. In addition, thestand 10 may be collapsed and locked by theaxle latch 140 and as shown inFigure 4 , to permit the power tool, such as a table saw, to be used at floor level, for example, for carpentry work involving floor moldings. The mobile power tool stand, when in the collapsed position shown inFigure 4 may also be used to transport the power tool in a fashion similar to a conventional two-wheeled handtruck. Conversely, thesaw mounting plate 18 may be detached from thepower tool bed 12 by operation of thelatch 22 and the combination power tool/mounting plate laid on thefoot portion 92 and transported in the conventional two-wheeled handtruck fashion - Those of ordinary skill in the art will conceive of other alternate embodiments of the invention upon reviewing this disclosure. Thus, the invention is not to be limited to the above description, but is to be determined in scope by the claims that follow.
Claims (12)
- A collapsible, self-jacking mobile power tool stand (10), comprising:an elongated power tool bed (12) having first and second ends (14, 16) for removably supporting a power tool (11);a substantially handtruck-shaped bed support (70) having an upper end (80) slidably connected to the power tool bed (12), an intermediate lever arm portion (72, 74) and a distal foot portion (92) having a preselected length terminating in a free end (94) and forming a preselected foot portion angle with respect to the lever arm portion (72, 74), wherein the bed support (70) is movable with respect to the power tool bed (12) between stowed and extended positions;at least one swing-out leg (30, 32) having an upper end (36) pivotally connected adjacent the power tool bed first end (14) and a distal free end (38) for contacting a substantially planar support surface, said at least one leg (30, 32) being pivotable between stowed and extended positions;at least one strut (48, 50) having a first end pivotally connected adjacent the power tool bed first end (14) and a distal second end pivotally connected to the bed support (70) so as to be pivotable between stowed and extended position forming an angle (α) between said at least one strut (48, 50) and the power tool bed (12) in the extended position; and,at least one wheel (100) having a preselected radius (R) and being rotatably connected to the bed support (70) for rolling the stand on the support surface when the bed support (70), strut (48, 50), and leg (30, 32) are in their respective stowed positions, and so that when the bed support (70), strut (48, 50), and leg (30, 32) are in their respective extended positions said at least one wheel (100) is lifted from the support surface and the stand is primarily supported by the leg (30, 32) and the foot portion free ends (94).
- The power tool stand of Claim 1, wherein the preselected foot portion angle is approximately 90 degrees.
- The power tool stand of Claim 1, wherein the wheel (100) is rotatably connected to the bed support lever arm portion (72, 74).
- The power tool stand of Claim 1, including a biasing mechanism interconnected between the struts (48, 50) and the power tool bed (12) to at least partially counterbalance a power tool (11) on the power tool bed (12) and to bias the strut (48, 50) and the bed support (70) toward their respective extended positions.
- The power tool stand of Claim 1, wherein the bed support upper end (80) is substantially adjacent the power tool bed second end (16) when in the extended position such that the bed support lever arm portion (72, 74) and the power tool bed (12) form an acute angle (β) with respect to each other.
- The power tool stand of Claim 5, wherein the foot portion free end (94) is positioned a distance (d) from a diameter of the wheel (100) normal to the support surface along a tangent of the wheel in contact with the support surface, wherein (d) is equal to or greater than approximately (R) and equal to or less than approximately (R/tan (90 degrees - β)).
- The power tool stand of Claim 5, wherein the angle (α) is acute and wherein the strut (48, 50) forms an acute angle (γ) with respect to the bed support (70) when the strut (48, 50) and bed support (70) are in their respective extended positions.
- The power tool stand of Claim 7, wherein (α), (β), and (γ) are approximately equal to 35, 75, and 70 degrees, respectively.
- The power tool stand of Claim 8, wherein (R) is approximately equal to 6 inches and d is approximately equal to 14.29 inches.
- The power tool stand of Claim 9, wherein the bed support free end (94) is substantially tubular and has a diameter of approximately 1.38 inches.
- The power tool stand of Claim 1, including a saw plate (18) removably attached to the power tool (12) bed by a spring loaded latch mechanism (22).
- The power tool stand of any one of the preceding claims, including:a pair of said bed support intermediate lever arm portions (72, 74) each connected to a respective one of said distal foot portions (92), each distal foot portion (92) forming said preselected foot portion angle with respect to the respective lever arm portion (72, 74);a pair of said swing-out legs (30, 32) having upper ends (36) pivotally connected adjacent the power tool bed first end (14) and distal free ends (38) for contacting the substantially planar support surface;a pair of said struts (48, 50), each having a first end pivotally connected adjacent the power tool bed first end (14) and a distal second end pivotally connected to the bed support (70), an angle (α) being formed between each strut and the power tool bed (12) in the extended position; anda pair of wheels (100) each having a preselected radius R and being rotatably connected to the bed support (70) about a common axis.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08014265A EP2153945A1 (en) | 2008-08-11 | 2008-08-11 | Self-Jacking mobile saw stand |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08014265A EP2153945A1 (en) | 2008-08-11 | 2008-08-11 | Self-Jacking mobile saw stand |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2153945A1 true EP2153945A1 (en) | 2010-02-17 |
Family
ID=40239625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08014265A Withdrawn EP2153945A1 (en) | 2008-08-11 | 2008-08-11 | Self-Jacking mobile saw stand |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2153945A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2845694A3 (en) * | 2013-08-13 | 2015-11-11 | Black & Decker Inc. | Portable workbench |
CN107512293A (en) * | 2014-12-22 | 2017-12-26 | 芜湖鑫泰铜业有限公司 | Ox head car is used in one kind transport |
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US5161590A (en) | 1992-01-27 | 1992-11-10 | Otto David L | Miter saw table apparatus |
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US20010047712A1 (en) * | 2000-01-10 | 2001-12-06 | Kahle W. Scott | Collapsible portable saw stand |
DE202004017660U1 (en) * | 2004-11-13 | 2005-03-17 | Einemann Guido | Work-piece processing and assembly table, comprising support elements, hydraulically operated lifting mechanism, and wheels |
US6886836B1 (en) | 2002-12-05 | 2005-05-03 | Robert W. Wise | Counterbalanced universal mobile saw stand |
US20060071450A1 (en) * | 2004-09-24 | 2006-04-06 | Super Made Products Co., Ltd. | Table saw cart |
US20060284390A1 (en) * | 2005-06-17 | 2006-12-21 | Worthy Michael W | Portable table for table saw |
US20070108683A1 (en) * | 2003-08-05 | 2007-05-17 | Mark Lawrence | Wheeled folding bench with hand truck capabilities |
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2008
- 2008-08-11 EP EP08014265A patent/EP2153945A1/en not_active Withdrawn
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US4230329A (en) | 1978-10-16 | 1980-10-28 | William H. Lambert | Mobile cart |
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US5161590A (en) | 1992-01-27 | 1992-11-10 | Otto David L | Miter saw table apparatus |
US5255724A (en) | 1992-11-12 | 1993-10-26 | Butke Gregory F | Adjustable extension assembly |
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US20070108683A1 (en) * | 2003-08-05 | 2007-05-17 | Mark Lawrence | Wheeled folding bench with hand truck capabilities |
US20060071450A1 (en) * | 2004-09-24 | 2006-04-06 | Super Made Products Co., Ltd. | Table saw cart |
DE202004017660U1 (en) * | 2004-11-13 | 2005-03-17 | Einemann Guido | Work-piece processing and assembly table, comprising support elements, hydraulically operated lifting mechanism, and wheels |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2845694A3 (en) * | 2013-08-13 | 2015-11-11 | Black & Decker Inc. | Portable workbench |
CN107512293A (en) * | 2014-12-22 | 2017-12-26 | 芜湖鑫泰铜业有限公司 | Ox head car is used in one kind transport |
CN107512293B (en) * | 2014-12-22 | 2019-11-19 | 亳州文青测量技术有限公司 | A kind of transport ox head vehicle |
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