Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
2008-01-22
2008-01-22
Huson, Gregory (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C137S625650
Reexamination Certificate
active
07320335
ABSTRACT:
A electrohydraulic control device H for the direction control of a hydro-motor, particularly for working pressures u to more than about 450 bar in a portable working device, comprises working lines A, B and a pressure line P and a respective load holding valve LA, LB in each working line A, B which load holding valve is switched from a load holding position for the respective working line to open to a return system R when a main directional solenoid seat valve VA, VB is in a switching position connecting the pressure source P with the respective other working line, and a circulation switching assembly U effective between the pressure source P and the return system R when the working lines A, B are separated from the pressure source P contains as the respective load holding valve LA, LB a 2/2-directional solenoid seat valve which selectively and electrically is switched open towards the return system R for, by intention, relieving the working pressure from the associated working line A, B.
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European Search Report for German Patent Application No. DE 02004003749, dated Oct. 5, 2004.
Heusser Martin
Neumair Georg
Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
HAWE Hydraulik GmbH & Co. KG
Huson Gregory
Schneider Craig M.
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