Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2006-08-17
2009-12-08
Williams, Thomas J (Department: 3657)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S267000, C188S317000
Reexamination Certificate
active
07628256
ABSTRACT:
A vibration damper providing amplitude-dependent damping for motor vehicles includes a first damping device including a piston rod which is disposed in a damping tube so as to be moveable in an oscillating manner and which supports a damping piston which divides the interior of the damping tube into a piston rod-side working chamber and a working chamber remote from the piston rod. The vibration damper further includes a second damping device which is disposed hydraulically parallel to the damping piston and includes an equalizing chamber which is divided into a first and a second partial chamber by a separating piston disposed so as to be axially displaceable in the equalizing chamber, wherein the first partial chamber is hydraulically connected to the piston rod-side working chamber and the second partial chamber is hydraulically connected to the working chamber remote from the piston rod. The separating piston advantageously includes at least one permanent magnet and at least one additional permanent magnet disposed in each end region of the equalizing chamber such that magnetic poles having the same polarity face each other in the end positions of the axial displacement capability of the separating piston.
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patent: 11013820 (1999-01-01), None
Jordan and Hamburg LLP
Thyssenkrupp Bilstein Suspension GmbH
Williams Thomas J
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