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:
Mar. 07, 1989
Filed:
Aug. 08, 1986
Helmuth Weissenberger, Waigolshausen, DE;
Alfred Schraut, Waigolshausen, DE;
Fichtel & Sachs AG, Schweinfurt, DE;
Abstract
The torsional vibration damper comprises in apertures in an input part and in an output part rotatable in relation to the input part coil thrust springs which couple the input part and the output part together in torsionally elastic fashion. Over a plurality of turns of the coil spring, the diameter of the wire material varies continuously from a first value to a second value. From one end of the spring to the other, it is possible for the diameter to diminish steadily. The diameter can however also either increase or decrease from the middle of the coil sprng towards the two ends. Springs of this type make it possible with relatively minimal structural expenditure to provide torsional vibration dampers which have a progressive characteristic.