Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Reexamination Certificate
2011-03-29
2011-03-29
Leslie, Michael (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
C091S445000
Reexamination Certificate
active
07913612
ABSTRACT:
In an actuator control device that controls an expansion/contraction operation of a hydraulic cylinder, when a main spool52is switched to a discharge position for discharging working fluid in the hydraulic cylinder, a back pressure chamber7communicates with a tank passage13via a first port14, thereby opening an operate check valve51, and as a result, the working fluid in the hydraulic cylinder flows into a return passage4from an actuator port1and into a pilot chamber20through a second port15. A pilot spool53is maintained in a balanced position by the pressure of the pilot chamber20, which is caused to act by a front-rear differential pressure of a control throttle25, and the biasing force of a spring22housed in a spring chamber21, and therefore the opening area of the first port14is controlled to and maintained at a fixed level.
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Kayaba Industry Co. Ltd.
Leslie Michael
Rabin & Berdo P.C.
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