Hydraulic system for controlling contact pressure

Details Hydraulic system for controlling contact pressure Hydraulic system for controlling contact pressure

1992-02-28

1994-10-18

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Plural separately controlled waste passages for single...

91454, 91468, 60460, F15B 13043

Patent

active

053557735

ABSTRACT:
A hydraulic system for controlling the contract force of a hydraulic device. A proportional pressure relief valve acts as pilot valve for a main valve that controls the lowering process. The proportional pressure relief valve is provided with a solenoid whose voltage can be varied. A pressure sensing line is also applied to the same side of the valve as the solenoid for biassing the valve against a spring.

REFERENCES:
patent: 3597907 (1971-08-01), Neal
patent: 4276810 (1981-07-01), Zeuner et al.
patent: 4276811 (1981-07-01), Zeuner et al.
patent: 4401009 (1983-08-01), Zeuner et al.
patent: 4622803 (1986-11-01), Lech
patent: 4873817 (1989-10-01), Harms
Bosch-Hydraulik, Systeminformation, dated May 1984.
Bosch, Fur Hydraulik, Prodkinformation dated Mar. 1990.
Deere technical manual, "Hydraulic Diagrams", pp. 270-20-4 to 270-15-9 Mar. 1986.
Patents abstract of Japan, application No. 62-47214, M-780 Dec. 23, 1988, vol. 12/No. 495.

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