Motors: expansible chamber type – With motive fluid valve – Relatively movable inlet and exhaust valves for single...
Reexamination Certificate
2006-04-18
2006-04-18
Look, Edward K. (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Relatively movable inlet and exhaust valves for single...
C091S461000, C060S422000
Reexamination Certificate
active
07028599
ABSTRACT:
In series between pump and tank are two throttle devices, one of which includes a controllable throttle valve having a piston, of which one side supports a valve head, which forms the boundary of an annular gap between an inflow duct and an outflow duct. A hydraulic control path extends from the inflow duct through the throttle opening to the tank, running through a precontrol bore in the piston. To prevent an unwanted leakage fluid stream, one end of the precontrol bore at the annular gap in the region of the inflow duct is positioned so that it remains opened for a closed annular gap, and the other end of the precontrol bore on the other side of the piston is arranged where the piston, in response to the controllable throttle valve being completely opened, pushes against a stop face and, in so doing, automatically closes this other end.
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Patent Abstracts of Japan, vol. 012, No. 464 (M-771), Dec. 6, 1988.
Kenyon & Kenyon LLP
Kershteyn Igor
Look Edward K.
ZF Lenksysteme GmbH
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