Apparatus and method for dual mode compact hydraulic system

Details Apparatus and method for dual mode compact hydraulic system Apparatus and method for dual mode compact hydraulic system

2007-07-20

2008-10-14

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

C060S475000

Reexamination Certificate

active

07434395

ABSTRACT:
A dual mode hydraulic actuator, comprising: a housing; a rod secured to a piston, the rod and piston being slidably received within the housing; a first chamber positioned on one side of the piston; a second chamber positioned on another side of the piston; a sealed reservoir; a fluid disposed in the first chamber, the second chamber and the reservoir; a bidirectional pump for moving the fluid between the first chamber, the second chamber and the sealed reservoir; a bi-mode control valve for providing selective fluid communication between the first chamber, the second chamber and the sealed reservoir, wherein the bi-mode control valve is spring biased into a neutral position wherein fluid communication between the first chamber, the second chamber and the sealed reservoir is prevented; and wherein the bi-mode control valve is capable of being manually manipulated into a manual mode position wherein fluid flow from the first chamber to the second chamber is provided and fluid flow from or to the sealed reservoir is also provided, the fluid flow from or to the sealed reservoir being dependant upon a volume of fluid in the first chamber and the second chamber.

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patent: 2002/0127126 (2002-09-01), Kaempe

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