Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Reexamination Certificate
2007-09-04
2007-09-04
Lazo, Thomas E. (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
C091S433000, C137S596130
Reexamination Certificate
active
11392476
ABSTRACT:
To simplify a circuit structure and a path structure in a hydraulic circuit having a pilot check valve and an overload relief valve and to reduce the size of a gear. The hydraulic circuit includes a pump port; a tank port; a first actuator port; a second actuator port; a first supply and discharge port; a second supply and discharge port; a direction changing valve; a first pilot check valve; a second pilot check valve; a first pilot path; and a first overload relief valve. The direction changing valve has a neutral position to communicate the first supply and discharge port with the tank port. The first overload relief valve is arranged in parallel with the first pilot check valve and is arranged between the first supply and discharge port and the first actuator port.
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patent: 3974742 (1976-08-01), Johnson
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patent: 5259293 (1993-11-01), Brunner
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patent: 06-050302 (1994-02-01), None
Patent Abstracts of Japan; English Translation of Abstract of Japanese Publ. No. 06-050302; Dated Feb. 22, 1994; (2 pages).
Lazo Thomas E.
Nabtesco Corporation
Osha & Liang LLP
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