Patent ID: 7080823

Claim:
In combination with a floor supported hoisting device having a floor supported frame, a generally central post extending vertically from said floor supported frame and terminating in a free end, a pivotally mounted arm extending outwardly from said free end, where said pivotally mounted arm includes a telescopically movable end, and a hydraulic piston to raise and lower said pivotally mounted arm, the improvement comprising an adapter member for mounting to said telescopically movable end, where said adapter member is sized to receive and support a weighted mass, said adapter member comprising: a.) a generally rectangular peripheral frame having an upper planar surface and a lower planar surface and defining an opening between said upper and lower surfaces; b.) a channel member, secured to said lower planar surface, for removably mounting to said telescopically movable end; c.) plural, upstanding members, extending upwardly from said upper planar surface, where each said upstanding member comprises a pair of parallel, spaced apart members, where respective first ends of said spaced apart members are mounted to a pivotal rod which in turn is movable within an opening in the wall of said peripheral frame, and an angled support selectively positionable along said spaced apart members, said upstanding members being pivotal throughout 360 degrees and arranged about said peripheral frame to contact and balance said weighted mass; and, d.) an encircling strap mechanism to override said weighted mass to secure same to said peripheral frame.