Hydraulic actuating device

Details Hydraulic actuating device Hydraulic actuating device

2007-05-15

2007-05-15

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Expanding chamber inlet controlled by contracting chamber...

C091S433000, C091S465000

Reexamination Certificate

active

11147898

ABSTRACT:
The invention relates to a hydraulic actuating device for a movable component of a vehicle, in particular a closure element for closing an opening in a vehicle body, such as for example a movable roof, such as a folding roof or a retractable hard top. The hydraulic actuating device according to the invention has hydraulic actuating means for driving a first control valve assembly, which hydraulic actuating means comprise at least one hydraulic control connection which is in communication with a second connection of a hydraulic actuator, and which hydraulic actuating means are designed to ensure that, when a first hydraulic pressure is present at the second connection, which first hydraulic pressure is the consequence of a connection being formed between the second connection and a pressure port of a pump, a first connection of the actuator is connected to a reservoir, and that when a second hydraulic pressure is present at the second connection, which second hydraulic pressure is the consequence of a connection being formed between the second connection and the reservoir, the first connection is connected to the pressure port of the pump.

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