Hydraulic elevator drive system

Details Hydraulic elevator drive system Hydraulic elevator drive system

1975-02-26

1976-08-31

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 17, B66B 104

Patent

active

039774970

ABSTRACT:
A hydraulic elevator drive system utilizes an elevator car speed signal and a commanded velocity signal to provide an electrical error signal and controls the operation of a fluid control regulating the fluid flow between a hydraulic actuator which moves the car, a hydraulic pump and a fluid reservoir. The fluid control includes a combined check and lowering valve and a by-pass valve selectively operated by a common control element including a dynamically operated control piston responding to the error signal. Another check valve couples the fluid pump to the fluid control whle a pair of manually preset control valve regulate the supply of fluid to the control piston for providing pre-established acceleration limitations to the elevator car.

REFERENCES:
patent: 2726735 (1955-12-01), Rohrberg
patent: 3187844 (1965-06-01), MacNair et al.
patent: 3570243 (1971-03-01), Comer et al.

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