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. 24, 1984
Filed:
Jul. 10, 1981
Applicant:
Inventors:
Masaharu Shibata, Kamakura, JP;
Tsutomu Furuyama, Yokohama, JP;
Assignee:
NHK Spring Co., Ltd., Yokohama, JP;
Primary Examiner:
Int. Cl.
CPC ...
B21F / ;
U.S. Cl.
CPC ...
72138 ;
Abstract
A method of forming a coil spring wherein, an element wire transferred longitudinally is passed between a support roller and a first pressing roller and then between the support roller and a second pressing roller. Coil springs with desired diameters are formed by varying the relative positions of the support roller and the first and second pressing rollers to curve the element wire with desired curvatures. The coil is supported to prevent it from sagging due to gravity acting thereon.
Shibata, Masaharu. (1984). Method of forming a coil spring (U.S. Patent No. 4444036). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4444036
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile