Electromechanical control for hydraulic elevators

Details Electromechanical control for hydraulic elevators Electromechanical control for hydraulic elevators

1982-03-11

1983-12-06

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

187 38, 91448, 91450, 91459, B66B 104

Patent

active

044187947

ABSTRACT:
In a hydraulic elevator, in which fluid is pumped to and from a tank into a piston to raise and lower the car, the flow of fluid is controlled by an apparatus which includes an electric motor that opens and closes a single valve to control the motion profile of the elevator car.

REFERENCES:
patent: 3437012 (1969-04-01), Bjorklund
patent: 4148248 (1979-04-01), Risk

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