Hydraulic elevator system

Details Hydraulic elevator system Hydraulic elevator system

1986-06-23

1987-08-18

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

91443, B66B 1104

Patent

active

046870784

ABSTRACT:
In a hydraulic elevator system including a hydraulic cylinder, ram mounted in the cylinder and supporting an elevator car, a reservoir of hydraulic fluid and a return line connected to communicate with hydraulic fluid in the cylinder and the reservoir to permit the fluid to exhaust from the cylinder to the reservoir, a control valve assembly has an exhaust orifice communicating with the fluid in the hydraulic cylinder and with the reservoir, an exhaust piston for selectively closing and opening the orifice and a device responsive to pressure of the hydraulic fluid for limiting the amount by which the exhaust piston opens the orifice.

REFERENCES:
patent: 3105573 (1963-10-01), Leveski
patent: 4601366 (1986-07-01), Blain

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