Abstract: A crank assembly for use with a hoist assembly comprising an elongated hollow housing with first and second elongated movable elements slidably mounted within opposed ends thereof. Inner ends of the movable elements have a threaded block secured therewith. A crank mechanism is carried within the hollow housing and includes an elongated rod with left hand threads formed along a first section, right hand threads formed along a second section and at least one drive gear mounted on said rod between said left and right hand threads. The threads at opposite ends of the rod are engaged with respective of the block threads connected with the first and second movable elements. A crank handle is connected with said crank mechanism for rotating the drive gear; which causes the crank mechanism to move the movable elements in opposed directions at equal rates. The crank assembly connects with the boom and a support rod of a hoist assembly.

Abstract: A crank assembly for use with a hoist assembly comprising an elongated hollow housing with first and second elongated movable elements slidably mounted within opposed ends thereof. Inner ends of the movable elements have a threaded block secured therewith. A crank mechanism is carried within the hollow housing and includes an elongated rod with left hand threads formed along a first section, right hand threads formed along a second section and at least one drive gear mounted on said rod between said left and right hand threads. The threads at opposite ends of the rod are engaged with respective of the block threads connected with the first and second movable elements. A crank handle is connected with said crank mechanism for rotating the drive gear; which causes the crank mechanism to move the movable elements in opposed directions at equal rates. The crank assembly connects with the boom and a support rod of a hoist assembly.