Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Reexamination Certificate
2006-09-27
2009-02-10
Lazo, Thomas E (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
C091S445000
Reexamination Certificate
active
07487707
ABSTRACT:
A hydraulic circuit controls flow of fluid between first and second ports of a hydraulic actuator, such as a cylinder/piston arrangement and each of a supply conduit and a tank return conduit. The hydraulic circuit operates in standard powered operating modes as well as powered and unpowered regeneration modes. In a powered operating mode, a conventional pressure compensated spool valve determines the velocity of the hydraulic actuator. A workport blocking valve connects one workport of the spool valve to the first port and the other workport is connected to the second port. A regeneration shunt valve is directly connected between the first and second ports of the hydraulic actuator. In a regeneration operating mode or a mix of powered and regeneration modes, a combination of the spool valve, the workport blocking valve, and the regeneration shunt valve determines the velocity of the hydraulic actuator.
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Pfaff Joseph L.
Stephenson Dwight B.
Husco International Inc.
Lazo Thomas E
Quarles & Brady LLP
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