McElroy, Robert C.;

Hand winch

A hand winch for scaffolds including a pair of cable drums for separately winding a pair of cables used for simultaneously raising one end of a scaffold. A shaft carrying a spur gear is fixed to the winch frame and the cable drums are journalled on the fixed shaft. A planet gear carrier is secured to the cable drums and rotates therewith with one gear of each pair of planet gears meshing with the spur gear. A hand crank is journalled in the frame and on the fixed shaft and carries a member with an internal spur gear thereon which meshes with the other of the pair of planet gears so that the drive provides a 161/2 to 1 mechanical advantage.

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What is claimed is:

1. A hand winch comprising a base plate, a pair of spaced apart parallel upright frame members secured to said base plate, a generally horizontal shaft fixedly secured to one of said frame members and extending through a bore in the other of said frame members, a second shaft axial to said first shaft and journalled in the bore in the other of said frame members and journalled on said fixed shaft, a hand crank fixedly secured to said second shaft for rotating said second shaft, a pair of cable drums mounted for rotation on said fixed shaft, planet gear means coupling said second shaft and said cable drums to rotate said cable drums upon rotation of said second shaft at a speed substantially less than the speed of rotation of said second shaft, and means on said cable drums cooperating with means on said one of said frame members for locking said cable drums against rotation in a pre-selected direction.