Hydraulic control unit for elevators

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support

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Details

137881, 91449, B66B 1104

Patent

active

043688055

ABSTRACT:
A control unit for a hydraulic actuated elevator consists of a valve device in the hydraulic circuit wherein the circuit includes a pump, a hydraulic cylinder and its piston for raising and lowering an elevator cab and a reservoir for the hydraulic fluid. The valve device features a rotary disc serving as a valve element slidable to positions which open and close ports leading respectively to the reservoir and the cylinder. A reversible electric motor in a cab demand circuit has a rotary drive to the rotary disc, as, for example, by a pinion and gear, for rotating the rotary disc in response to the cab demand circuit serving to start and stop the motor. In one position of the rotary disc, with both ports closed, hydraulic fluid is passed directly into the cylinder for up travel of the cab. In an intermediate position with the port to the cylinder closed the fluid is locked in the cylinder in stop position of the cab. In a third position with both ports open fluid flows from the cylinder to the reservoir, bypassing the pump, for down travel of the cab.

REFERENCES:
patent: 3136328 (1964-06-01), Hipp
patent: 3141386 (1964-07-01), Loughridge
patent: 3710824 (1973-01-01), Lohbauer

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