Control valve device for hydraulic elevator

Details Control valve device for hydraulic elevator Control valve device for hydraulic elevator

1994-10-20

1996-06-04

Noland, Kenneth

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes fluid supporting ram in drive-means

91454, B66B 904

Patent

active

055224792

ABSTRACT:
A control valve device for a hydraulic elevator including a main check valve connected between a hydraulic cylinder adapted to ascend and descend a car of the hydraulic elevator and a hydraulic pump adapted to pump a pressurized oil, a cylinder-side pressure detector disposed between the hydraulic cylinder and the main check valve and adapted to detect a pressure in side of the hydraulic cylinder, a pump-side pressure detector disposed between the main check valve and the hydraulic pump and adapted to detect a pressure in side of the hydraulic pump, an opening solenoid valve connected between the main check valve and the hydraulic pump and adapted to receive a pilot pressure generated only from a pressure generated by the hydraulic pump and open the main check valve in response to the pilot pressure, and a closing solenoid valve connected to the main check valve and adapted to close the main check valve opened by the opening solenoid valve.

REFERENCES:
patent: 5285027 (1994-02-01), Nakamura et al.
patent: 5374794 (1994-12-01), Holmes

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