Control circuit for a double-acting hydraulic jack and slide dis

Details Control circuit for a double-acting hydraulic jack and slide dis Control circuit for a double-acting hydraulic jack and slide dis

1991-04-02

1993-06-01

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91421, 91440, F15B 1108, F15B 1304

Patent

active

052149978

ABSTRACT:
The control circuit of a double-acting hydraulic jack (10), consisting of a piston (12) connected to an output rod (18) and separating a cylinder into two chambers (14, 16), comprises a source of fluid under pressure (20, 26), a distribution system (28, 28', 52, 52') alternately putting one of the chambers, or control chamber, in communication with the source of fluid under pressure (20, 26) and the other chamber, or controlled chamber, in communication with a reservoir of fluid under low pressure (25), in order to control the movement of the piston (12) of the jack (10). The jack comprises an auxiliary circuit (50, 120, 122) for preventing communication between the controlled chamber and the reservoir (25), interrupting communication between the control chamber and the source of fluid under pressure (20, 26) and allowing communication between the controlled and control chambers when the pressure of the fluid in the controlled chamber exceeds a predetermined value.

REFERENCES:
patent: 1964196 (1934-06-01), Cuttat
patent: 3576192 (1971-04-01), Wood et al.
patent: 3974742 (1976-08-01), Johnson
patent: 4006663 (1977-02-01), Baatrup et al.
patent: 4012031 (1977-03-01), Mitchell et al.
patent: 4266464 (1981-05-01), Baatrup et al.
patent: 4840111 (1989-06-01), Garnjost

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