Hydraulic elevator

Details Hydraulic elevator Hydraulic elevator

1984-01-06

1985-10-22

Skaggs, H. Grant

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

91452, 137486, B66B 1104

Patent

active

045482969

ABSTRACT:
This invention relates to a hydraulic elevator wherein working oil is transferred from a tank to a jack or vice versa by means of a hydraulic pump which is driven by an electric motor, so as to cause the elevator to ascend and descend; characterized in that a hydraulic circuit is equipped with electronically-controlled variable flow solenoid valves which set flow rates of the working oil in accordance with a program for electronic control in correspondence with respective stages of stop, slow speed ascent, full speed ascent, slow speed descent and full speed descent of the elevator.

REFERENCES:
patent: 3105573 (1963-10-01), Leveski
patent: 3141386 (1964-07-01), Loughridge
patent: 3363514 (1968-01-01), Ramoke
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4031813 (1977-06-01), Walters et al.
patent: 4205592 (1980-06-01), Haussler
patent: 4412600 (1983-11-01), Ito et al.

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