Apparatus for improving the performance of a motor-controlled hy

Details Apparatus for improving the performance of a motor-controlled hy Apparatus for improving the performance of a motor-controlled hy

1989-08-29

1991-05-14

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, 187110, 91454, B66B 1104

Patent

active

050148230

ABSTRACT:
The invention concerns an 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: 4179889 (1979-12-01), Gondek
patent: 4637495 (1987-01-01), Blain
patent: 4676140 (1987-06-01), Haussler

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