Hydraulically operated elevator door mechanism

Details Hydraulically operated elevator door mechanism Hydraulically operated elevator door mechanism

1987-01-23

1988-04-05

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

49360, 60476, B66B 1300

Patent

active

047352922

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.

REFERENCES:
patent: 2378409 (1945-06-01), Joy
patent: 2480527 (1949-08-01), Wachter et al.
patent: 3327428 (1967-06-01), Horton et al.

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