Portable hoist
AssigneeDwight L. Duimstra
InventorsLarry J. Fanning, Dwight L. Duimstra
Life of this patent
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AssigneeDwight L. Duimstra
InventorsLarry J. Fanning, Dwight L. Duimstra
Estimating the term…
A portable hoist consisting essentially of three major components readily assembled and disassembled at the job site in a relatively short period of time to facilitate portability. The three basic components include a generally horizontally disposed main frame, an elongated upright mounted at one end of the main frame and a generally horizontally extending boom at the upper end of the upright with the boom and main frame extending from opposite sides of the upright and from the upper and lower ends respectively. The main frame includes structure enabling it to be supported by wheeled units, structure to enable an end portion of the frame remote from the upright to be anchored to a supporting deck or platform such as a truck or similar vehicle, a building floor or other support and an area receiving a counterweight at a point remote from the upright. The portable hoist has particular utility in lifting preassembled house panels or sections into place by being supported from the interior house deck without need for exterior landscaping or back-filling prior to wall erection. When used on multistory buildings, the portable hoist can simply be moved to upper floors as they are completed.
A portable hoist comprising a generally elongated, rectangular, horizontally disposed frame having a substantially planar bottom surface, an elongated upright mounted on one end of said frame and extending upwardly therefrom, an elongated boom mounted at the upper end of the upright and extending generally horizontally, said boom and said frame extending in opposite directions from the upright, winch means mounted on said hoist and including a lift cable entrained over a pulley at the outer end of the boom, means on the free end of the lift cable for engaging a load, said upright being detachably connected to said frame by removable pin means, and removable pin means connecting the boom to the upper end of the upright, said winch means including a winch drum and motor mounted on the upright adjacent the lower end thereof, a pulley mounted on the upper end of the upright in alignment with the winch drum for receiving the lifting cable with the lifting cable being wound on said winch drum, a wheeled unit mounted in underlying relation to each end of the frame to enable the frame to be moved from one location to another, one of said wheeled units being steerable for guiding movement of the hoist, the wheeled unit adjacent the end of the frame to which the upright is connected including a rigid axle journaling more than two wheels along a single axis and lying in parallel planes, upstanding support pins rigid with the axle and terminating in upper ends extending above a horizontal member rigidly spaced above said axle, said frame including a pair of vertical sleeves rigidly mounted in the corners of said frame at one end thereof and telescopically and detachably receiving the pins for mounting the wheeled unit below the frame.
A portable hoist comprising a generally elongated, rectangular, horizontally disposed frame having a substantially planar bottom surface, an elongated upright mounted on one end of said frame and extending upwardly therefrom, an elongated boom mounted at the upper end of the upright and extending generally horizontally, said boom and said frame extending in opposite directions from the upright, winch means mounted on said hoist and including a lift cable entrained over a pulley at the outer end of the boom, means on the free end of the lift cable for engaging a load, said upright being detachably connected to said frame by removable pin means, and removable pin means connecting the boom to the upper end of the upright, said frame including a centrally disposed sleeve at the end of the frame remote from the upright with the sleeve being rigid on the frame, anchoring means for engagement with the sleeve for anchoring the frame against a generally planar supporting surface, said anchoring means including an upstanding pin telescopically received in the sleeve and including a transverse aperture in the upper end thereof adapted to receive a retaining fastener, flat plate means on the lower end of the pin to be fastened to a truck load bed or other supporting surface in order to secure the pin to a truck load bed or other supporting surface for anchoring the frame to prevent tilting of the hoist when a load is lifted.
Dependencies are inferred from the claim text.