Motors: expansible chamber type – With motive fluid valve – Both inlet and exhaust controlled by motive fluid pressure...
Reexamination Certificate
2008-08-26
2011-10-11
Lazo, Thomas E (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Both inlet and exhaust controlled by motive fluid pressure...
C701S050000
Reexamination Certificate
active
08033209
ABSTRACT:
A lifting mechanism has a continuously variable lifting mechanism valve, with a multi-position valve, by way of which a lifting cylinder can be made to communicate with a pump or a tank. In the flow path of the pressure fluid from the multi-position valve to a pressure chamber, effective in the “carrying” direction, of the lifting cylinder, there is a relief pressure limiting valve, by way of which a relief pressure can be proportionally set. During relief pressure regulation, a metering aperture, which is predetermined by the proportionally variable multi-position valve, is opened, so that the volumetric flow of pressure fluid to the tank is minimized via the pressure limiting valve.
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Lazo Thomas E
Robert & Bosch GmbH
Striker Michael J.
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