BACKGROUND AND SUMMARY
The invention relates to exercise apparatus for resistance training.
Various types of exercise apparatus for resistance training include a platform supporting the user, e.g. a stand-upon platform supporting the feet of the user, for a hip flexor or hip glute machine, and so on. The platform is adjustable up and down, to accommodate different height users. One known type of platform adjustment mechanism uses a peg-in-hole type lock.
The present system provides a simple and effective platform adjustment mechanism for resistance training exercise apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of exercise apparatus for resistance training in accordance with the invention.
FIG. 2 is an exploded perspective view of a portion of FIG. 1.
FIG. 3 is an enlarged perspective view of a portion of FIG. 1.
FIG. 4 is like FIG. 3 and shows an alternate position of the platform.
FIG. 5 is a side elevation view of the structure of FIG. 3.
FIG. 6 is a sectional view taken along line 6-6 of FIG. 3.
FIG. 7 is like FIG. 5 and illustrates operation of the platform during a height change.
FIG. 8 is like FIG. 7 and shows completion of a height adjustment to a new vertical elevation.
FIG. 9 is an enlarged view of a portion of FIG. 3, and shows a further embodiment.
DETAILED DESCRIPTION
FIG. 1 shows exercise apparatus 20 for resistance training, including a frame 22 resting on a floor 24 and supporting a laterally extending platform 26 at a plurality of vertical elevations, to be described. Platform 26 supports and locates a user for resistance training, e.g. a hip flexor or hip glute routine wherein the user extends one leg over pad 28, while holding onto handlebar 30 and/or 32, and swings leg/knee pad 28 in an arc to rotate pulley 34 to in turn lift one or more weights in weight stack 36 (partially hidden by shield plate 38) via pulley cable system 40, all as is known. Platform 26 supports and locates the user for such resistance training, e.g. supporting one leg and foot of the user, while the other leg is extended over and partially around pad 28.
Platform 26, FIGS. 1-3, has distally opposite first and second sides 50 and 52 laterally spaced along a first lateral axis 54. The platform has distally opposite third and fourth sides 56 and 58 laterally spaced along a second lateral axis 60. Lateral axes 54 and 60 are normal to each other. An adjustment mechanism 62 is provided for raising and lowering platform 26 to a plurality of vertical elevations. The adjustment mechanism both: a) journals platform 26 to pivot about a pivot axis 64 parallel to first lateral axis 54 into and out of engagement with a detent lock 66, to be described, such that platform 26 is locked in place at a given vertical elevation when pivoted into engagement with the detent lock, and the platform may move up and down when pivoted out of engagement with the detent lock; and b) linearly guides translational movement of platform 26 during the noted up and down movement of the platform and prevents side to side canting of the platform about second lateral axis 60 during the noted up and down movement of the platform and preventing misalignment of first and second sides 50 and 52 of the platform.
Adjustment mechanism 62 includes first and second stanchions 68 and 70 extending upwardly from frame 22. Each stanchion has a respective track 72 and 74 extending upwardly and downwardly therealong, and a respective tooth rack 76 and 78 extending upwardly and downwardly therealong. Platform 26 includes a floorboard 80 mounted by bolts 82 to a carriage 84 having first and second bearing blocks 86 and 88 pivotable about and translational along respective stanchions 68 and 70. Tooth racks 76, 78 provide the noted detent lock, to be further described.
First bearing block 86 has a horizontal first main shaft 90, FIGS. 2, 3, translational along track 72 of stanchion 68, FIGS. 5-8, and moving upwardly and downwardly therealong during up and down movement of platform 26. Second bearing block 88 has a horizontal second main shaft 92 translational along track 74 of stanchion 70 and moving upwardly and downwardly therealong during up and down movement of platform 26. Horizontal first and second main shafts 90 and 92 are coaxial. Platform 26 is pivoted between a first locked position, FIGS. 1, 3-6, 8, and a second unlocked position, FIG. 7, by swinging the noted third side 56 of platform 26 upwardly and downwardly, FIGS. 7, 8, to pivot platform 26 about the coaxial horizontal main shafts 90 and 92. First bearing block 86 has a horizontal first auxiliary shaft 94, FIGS. 2, 3, engaging a given first tooth 96 in tooth rack 76 of stanchion 68 in the noted first pivoted locked position of platform 26 to lock the platform at a given one of the noted vertical elevations corresponding to tooth 96. Horizontal first auxiliary shaft 94 disengages tooth rack 76 of stanchion 68 in the noted second pivoted unlocked position of platform 26 to, unlock the platform and permit upward and downward movement thereof, FIG. 7. Second bearing block 88 has a horizontal second auxiliary shaft 98, FIGS. 2, 3, engaging a given second tooth 100 in tooth rack 78 of stanchion 70, corresponding to tooth 96, in the noted first pivoted locked position of platform 26 to lock the platform at the noted given one of the vertical elevations corresponding to teeth 100 and 96. Horizontal second auxiliary shaft 98 disengages tooth rack 78 in the noted second pivoted unlocked position of platform 26, FIG. 7, to unlock the platform and permit upward and downward movement thereof. Horizontal first and second main shafts 90 and 92 engage tracks 72 and 74 of first and second stanchions 68 and 70, respectively, at each of the vertical elevations along the stanchions at respective vertically spaced teeth of the respective tooth racks, and during at least a portion of travel of the platform during the up and down movement thereof.
Adjustment mechanism 66 further includes first and second guide rods 102 and 104, FIGS. 1-3, extending upwardly from frame 22 adjacent first and second stanchions 68 and 70, respectively. The adjustment mechanism further includes first and second linear bearing assemblies 106 and 108 slidable upwardly and downwardly along respective first and second guide rods 102 and 104 and operatively connected to respective first and second bearing blocks 86 and 88 to guide translational up and down movement of first and second bearing blocks 86 and 88 and prevent canting of platform 26 about the noted second lateral axis 60. First and second linear bearing assemblies 106 and 108 have respective first and second bearing sub-blocks 110 and 112 laterally adjacent respective first and second stanchions 68 and 70. Horizontal first main shaft 90 has a first end 114 mounted to first bearing block 86, and has a second end 116 mounted to first bearing sub-block 110. Horizontal second main shaft 92 has a first end 118 mounted to second bearing block 88, and has a second end 120 mounted to second bearing sub-block 112. First stanchion 68 is disposed laterally between first bearing block 86 and first bearing sub-block 110. Second stanchion 70 is disposed laterally between second bearing block 88 and second bearing sub-block 112. Guide rods 102 and 104 extend upwardly to upper ends which are mounted to support arms 103 and 105 of the frame to rigidly locate and anchor guide rods 102 and 104. Support arms 103 and 105 extend upwardly from the frame and then curve laterally and are bolted to respective stanchions 68 and 70 at respective bolts 107 and 109.
First stanchion 68 has a first slot 122 formed laterally therethrough, which slot is elongated upwardly and downwardly along first stanchion 68 and has opposing elongated inner sides 124 and 126 facing each other across such slot. Inner side 124 provides the noted track 72 of first stanchion 68, and inner side 126 provides the noted tooth rack 76 of first stanchion 68. Horizontal first main shaft 90 extends laterally through first slot 122. Second stanchion 70 has a second slot 128 formed laterally therethrough, which slot is elongated upwardly and downwardly along second stanchion 70 and has opposing elongated inner sides 130 and 132 facing each other across slot 128. Inner side 130 of second slot 128 provides the noted track 74 of second stanchion 70, and inner side 132 of second slot 128 provides the noted tooth rack 78 of second stanchion 70. Horizontal second main shaft 92 extends laterally through second slot 128.
In the disclosed embodiment, platform 26 is a stand-upon platform supporting the feet of the user, though other types of support platforms may be used. Platform 26 is a cantilever having a root end at fourth side 58, and a free end at third side 56. The user grips the platform at third and fourth sides 56 and 58, and then tilts third side 56 upwardly, as shown at arrow 134 in FIG. 7, to move auxiliary shafts 94 and 98 out of engagement with respective teeth, as shown at arrow 136, and then the platform is translated upwardly as guided by linear bearing assemblies 106 and 108 along guide rods 102 and 104, as shown at arrow 138 in FIG. 8, whereafter third side 56 of the platform is tilted downwardly to in turn move auxiliary shafts 94 and 98 into engagement with respective teeth of respective tooth racks, as shown at arrow 140 in FIG. 8.
In a further and preferred embodiment, FIG. 9, horizontal auxiliary shaft 98 of FIG. 3 includes a cam follower 142 journaled thereto. Horizontal first auxiliary shaft 98 engages tooth rack 78 and its teeth of stanchion 70 at cam follower 142. Horizontal auxiliary shaft 94 also includes a cam follower as shown in dashed line at 144 in FIG. 3, journaled thereto, and horizontal auxiliary shaft 94 engages tooth rack 76 and its teeth of stanchion 68 at cam follower 144. The cam followers may be desirable to reduce the chance of a “false lock” and to make adjustment easier. False lock could possibly occur if a shaft such as 98 catches on the point of the tooth increment, e.g. 146, instead of settling into a tooth or concavity such as 148. This causes platform 26 to be at rest at an angle, and in a position that can be easily bumped, causing the platform to release and fall. Furthermore, when a user lifts platform side 56, shafts 98 and 94 may contact the respective inner sides 130 and 124 of slots 128 and 122 of tracks 74 and 72, which contact of shafts 98 and 94 against sides 130 and 124 can result in excessive friction, making the platform harder to lift. The addition of the cam followers 142 and 144 on the outer ends of the shafts eliminate these potential problems, and provide easier adjustment. Tooth racks 78 and 76 are modified to fit the diameter of the respective cam follower 142 and 144 which is larger than the diameter of the respective shaft 98 and 94. When side 56 of the platform is lifted, cam followers 142 and 144 can come into contact with inner sides 130 and 124 of the respective slots and roll therealong, resulting in easier raising and lowering of the platform. The teeth of tooth racks 78 and 76 may thus be engaged directly by respective shafts 98 and 94 as in FIGS. 1-8, or may be engaged through respective cam followers 142 and 144 as in FIG. 9.
In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. The different configurations, systems, and method steps described herein may be used alone or in combination with other configurations, systems and method steps. It is to be expected that various equivalents, alternatives and modifications are possible within the scope of the appended claims.
Patent Grant
7476186
