Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2007-03-12
2010-06-29
Nguyen, Xuan Lan (Department: 3657)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S304000
Reexamination Certificate
active
07743895
ABSTRACT:
Vibration damper comprising a cylinder in which a piston rod is guided with freedom of axial movement, where the piston rod cooperates with a piston arrangement comprising a first, stationary piston and at least one additional piston, which is supported on the piston rod with freedom of axial movement against the elastic force of at least one restoring spring, where the cylinder is divided by the stationary piston and by the minimum of one axially movable piston into a working space on the side of the piston facing the piston rod, a working space on the side of the piston facing away from the piston rod, and a working space between the two pistons, where valve-equipped through-openings control a connection between the working spaces, and where the axial movement of the minimum of one axially movable piston is limited by a hydraulic pressure stop.
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Cohen Pontani Lieberman & Pavane LLP
Nguyen Xuan Lan
ZF Friedrichshafen AG
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