Power plants – Pressure fluid source and motor – Having means controlling or attenuating shock vibration,...
Reexamination Certificate
2004-11-19
2008-11-25
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Having means controlling or attenuating shock vibration,...
C060S468000
Reexamination Certificate
active
07454906
ABSTRACT:
What is disclosed is a hydraulic control system for controlling a hydraulic consumer actuating a working tool of a mobile equipment that is provided with oscillation damping means for attenuating oscillations during braking of the working tool. In accordance with the invention, the oscillation damping means comprise two pilot-controlled shut-off valves arranged in opposite directions, that are positioned in a connecting line between a pressure medium supply and a pressure medium drain. The shut-off valves are subjected to the pressure in the drain and in the delivery, respectively, in the opening direction, and also to this pressure and to the force of a spring in the closing direction. Following a predetermined initial stroke of a regulator of the control system, the pressure acting on the drain-side shut-off valve in the closing direction may be reduced, so that the latter is opened by the pressure in the drain, and the connecting line between delivery and return is opened.
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Guyard Vincent
Kauss Wolfgang
Bosch Rexroth AG
Leslie Michael
Oliff & Berridg,e PLC
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