Motors: expansible chamber type – With motive fluid valve – Contracting chamber exhaust valve controlled by expanding...
Reexamination Certificate
2007-03-27
2007-03-27
Leslie, Michael (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Contracting chamber exhaust valve controlled by expanding...
C091S447000
Reexamination Certificate
active
10858433
ABSTRACT:
A hydraulic actuating device for moving a retractable hard-top of a convertible car. The actuating device comprises a double-acting hydraulic actuator, the first connection of the actuator being in communication with an associated throttling assembly which is designed to provide either an optionally controllable throttling or a clear passage opening, which is larger than the throttling opening, as a function of a switching parameter. The throttling assembly has a pressure-detection means for detecting the hydraulic pressure in the second working chamber, which pressure-detection means has associated with it a predetermined switching pressure. The throttling assembly is designed such that—when pressurized hydraulic fluid is supplied to the second working chamber—the clear passage opening is active if the detected pressure in the second working chamber is above the switching pressure and that the throttling is active if the detected second working chamber hydraulic pressure is below the switching pressure.
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Actuant Corporation
Leslie Michael
Quarles & Brady LLP
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