The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1992
Filed:
Sep. 01, 1989
Hans-Christof Klein, Hattersheim, DE;
Peter Lohberg, Friedrichsdorf, DE;
Alfred Teves GmbH, Frankfurt am Main, DE;
Abstract
A controllable vibration damper for automotive vehicles is disclosed having a damping piston which is axially slidably and sealedly guided in a damping tube, and which subdivides the damping tube filled with a damping medium into two working chambers. The connection between the two working chambers is provided with at least one non-regulated first valve and at least one controllable second valve, which valves are arranged acting hydraulically in parallel in respect to one another. In order to be able to regulate the effective damping force continuously in wide ranges, for the adjustment of damping hardness, the controllable valve will periodically open and close in rapid sequence in dependence upon pulsed control signals.