Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Reexamination Certificate
2011-03-15
2011-03-15
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
C060S417000, C060S418000
Reexamination Certificate
active
07905088
ABSTRACT:
A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of both cylinders, and a shunt control valve is connected between the workports. A recovery control valve couples an accumulator to the first chamber of the second cylinder. Opening and closing the valves in different combinations routes fluid from one or both cylinders into the accumulator where the fluid is stored under pressure, and thereafter enables stored fluid to be used to power one or both cylinders. The shunt control valve is used to route fluid exhausting from one chamber of each cylinder to the other chambers of those cylinders. Thus the hydraulic system recovers and reuses energy in various manners.
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Hamkins Eric P.
Pfaff Joseph L.
Stephenson Dwight B.
Tabor Keith A.
Haas George E.
INCOVA Technologies, Inc.
Lopez F. Daniel
Quarles & Brady LLP
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