Hydraulic elevator

Details Hydraulic elevator Hydraulic elevator

1985-03-18

1987-01-27

Skaggs, H. Grant

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, 187 28, 187 69, 187 73, 303 10, 91 42, 91 44, B66B 104, B66B 516

Patent

active

046388885

ABSTRACT:
A non-public hydraulic elevator has three emergency systems isolated from the primary drive system: a control system, a manually activated emergency descent system, and an emergency stop system. A hydraulic brake is provided a primary and emergency brake release pressure supply by the control and manually activated emergency descent systems, respectively. The emergency stop system overrides the control system and the emergency descent system to positionally lock the elevator car. A hydraulic safety-governor system operates during descent to monitor and maintain a controlled descent speed.

REFERENCES:
patent: 1050949 (1913-01-01), Jones
patent: 2407694 (1946-09-01), Vickers
patent: 3120880 (1964-02-01), Joseph
patent: 3601235 (1971-08-01), Huf
patent: 3830338 (1974-08-01), Svensson
patent: 3892292 (1975-07-01), Takenoshita et al.
patent: 3942607 (1976-03-01), Sobat
patent: 3999075 (1976-12-01), Johnson et al.
patent: 4256350 (1981-03-01), Hoefer
patent: 4533021 (1985-08-01), Perez de la Orden

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