Fluid handling – Systems – Supply and exhaust
Patent
1977-11-03
1979-02-27
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
91464, 13759616, F15B 13043, F15B 1308
Patent
active
041413822
ABSTRACT:
A direction control valve for controlling a reversible hydraulic actuator includes a valve body in which a pair of valve stems and a pair of float control pistons, respectively axially aligned with the valve stems, are reciprocally mounted. To establish a float condition in the actuator, the pair of valve stems are simultaneously shifted to respective active positions by engagement of the pair of float-control pistons to which pressure fluid is routed upon selective energization of a solenoid-operated valve by manually closing a first normally open switch. A second normally open switch is connected in parallel with the first switch and is closed by a switch-control piston mounted in the valve body between and in fluid communication with the float-control pistons and shiftable concurrent therewith whereby the manually operable switch may be released without effecting de-energization of the solenoid-operated valve. A control rod is rockably mounted in the valve body for selective movement to opposite sides of a neutral position for respectively initiating independent shifting of the pair of valve stems to their active positions for respectively effecting extend and retract conditions in the actuator. A cam is fixed to the control rod and is operable, when the control valve is in its float-effecting condition and the control rod is moved from its neutral position, to move the switch-control piston to release the second switch and de-energize the solenoid-operated valve whereby the control valve is released from its float effecting condition.
REFERENCES:
patent: 3924656 (1975-12-01), Hanser et al.
patent: 4057701 (1977-11-01), Sisk et al.
Miller James A.
Snyder William L.
Deere & Company
Michalsky Gerald A.
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