Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
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
Fitzgerald Thomas
Greenstien Robert E.
Otis Elevator Company
Rolla Joseph J.
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