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:
Feb. 19, 1985
Filed:
Sep. 27, 1982
Tamio Nagano, Hirakata, JP;
Kabushiki Kaisha Daikin Seisakusho, Neyagawa, JP;
Abstract
A damper disc used as a clutch disc of a friction clutch includes a spline hub splined to an output shaft and having a radial flange, a pair of annular side plates arranged at both sides of the flange and having a radially outer portion to which torque is transmitted, and torsion springs arranged at openings in the flange and the side plates. At least some of the torsion springs consist of coaxially arranged double compressible coil springs including a diametrically large outer spring and a diametrically small inner spring. Each of these small springs is hourglass-shaped so that their diameters gradually change along their length and their axially middle portions have the smallest diameters. The diametrically large outer springs may also have an hourglass shape.