Hydraulic elevator control

Details Hydraulic elevator control Hydraulic elevator control

1990-09-28

1992-01-21

Dayoan, D. Glenn

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 292, 91454, B66B 1104

Patent

active

050820915

ABSTRACT:
The flow of hydraulic fluid to and from an hydraulic elevator piston is controlled by a motor-actuated spool valve operated by a microprocessor. To lower the elevator, a main check valve is opened by a down piston using hydraulic fluid from the system. Pressure is equalized on both sides of the main check valve just before the latter is opened thereby allowing the use of a smaller down piston which uses less hydraulic fluid. This results in smoother car motion during descent of the car. The addition of a valve bleed passage to equalize pressure on both sides of the check valve also prevents rapid descent of the elevator car in the event that the spool valve were to be open at the time descent commences.

REFERENCES:
patent: 2563295 (1951-08-01), Westbury
patent: 4557180 (1985-12-01), Glomeau
patent: 4676140 (1987-06-01), Haussler

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