Material or article handling – Load support has linear vertical movement and additional... – Additional movement is rotational
Patent
1990-03-15
1992-03-31
Spar, Robert J.
Material or article handling
Load support has linear vertical movement and additional...
Additional movement is rotational
414642, 414607, 254 8B, 187 11, B65G 708
Patent
active
051002833
ABSTRACT:
A hoist is provided for lifting, positioning and holding a trailer hitch beneath the frame of a motor vehicle to facilitate installation of the hitch. A movable platform supports an upstanding post having a sleeve telescoped thereon. Both the post and sleeve have complimentary non-circular cross sections to prevent rotation of the sleeve on the post. A winch carried by the sleeve raises and lowers the sleeve via a cable attached to the post above the sleeve. A support arm has its proximal end pivotally connected about a horizontal axis to the sleeve. The distal end of the arm receives a variety of couplers for attachment to various hitches. A hydraulic cylinder also carried by the sleeve beneath the arm has a piston rod positioned to engage the arm a short distance from its proximal end to raise and lower the arm with a hitch thereon for angular adjustment independent of movement of the sleeve. The coupler at the distal end of the arm permits rotational movement of the hitch about the longitudinal axis of the arm.
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patent: 4684310 (1987-08-01), Stange
patent: 4899986 (1990-02-01), Tweedy
Keenan James
Spar Robert J.
U-Haul International Inc.
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