Abstract: A manually operated door for an elevator cab opening includes a top track, a bottom track, and a plurality of door panel assemblies supported by the top track. Each of the tracks includes a front portion parallel to the cab opening, a curved portion adjacent the front portion and undergoing a right angle bend, and a side portion adjacent the right angle bend, parallel to a side wall of the cab. The top track includes inner and outer parallel and concentric track portions. A three wheeled carriage is provided for riding in the top track, whereby the door panels can readily make tight radius turns in being moved from open to closed and vice versa. Door assemblies are guided by the top and bottom tracks. An individual door assembly includes the three-wheeled carriage, a hinge pin supported by the carriage and extending down to the bottom track and guided thereby, and a tangential roller supported by the hinge pin.

Abstract: A hydraulically operated elevator door mechanism includes a motor-driven shaft connected to rotate gears within a fluid reservoir. Fluid is "pumped" as the gears rotate, to one side of a piston, propelling the piston. The piston is connected to two pulleys over which a cable length is attached to the elevator door. Piston movement causes the pulleys to effectively shorten the length of cable between the pulley and door, which in turn, causes the door to slide.