Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1988-11-03
1991-09-17
Olszewski, Robert P.
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, 60466, B66B 1104
Patent
active
050486446
ABSTRACT:
The invention concerns a method and apparatus for improving the performance of a motor-controlled hydraulic elevator, in which oil is pumped using an hydraulic pump controlled by an electric motor from a container via a main supply duct into a lifting cylinder to move the elevator upwards, and returned in a controlled manner through the pump into the container to move the elevator downwards. In order to improve the loading conditions of the motor during down-travel, the oil pressure in the main duct is reduced to a substantially predetermined constant level by means of a check valve or lowering valve which, to provide compensation for the pressure in the pump, has a feedback connection to the main duct via a pressure compensation valve which controls the volume of flow through the check valve or lowering valve.
REFERENCES:
patent: 2768500 (1956-10-01), Tyler
patent: 4179889 (1979-12-01), Gondek
patent: 4211254 (1980-06-01), Dyal
patent: 4637495 (1987-01-01), Blain
patent: 4676140 (1987-06-01), Haussler
Kone OY
Noland Kenneth
Olszewski Robert P.
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