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:
Nov. 17, 2020
Filed:
Apr. 12, 2019
Applicant:
Nhk Spring Co., Ltd., Yokohama, JP;
Inventors:
Senri Moriyama, Yokohama, JP;
Satoshi Akiyama, Fujisawa, JP;
Masaya Komazaki, Yokohama, JP;
Go Nagayasu, Yokohama, JP;
Hideki Okada, Yokohama, JP;
Daisuke Yokota, Yokosuka, JP;
Assignee:
NHK SPRING CO., LTD., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16F 1/04 (2006.01); B24C 1/10 (2006.01); B24C 3/24 (2006.01); F16F 1/02 (2006.01);
U.S. Cl.
CPC ...
B24C 1/10 (2013.01); B24C 3/24 (2013.01); F16F 1/02 (2013.01); F16F 1/04 (2013.01);
Abstract
A coil spring includes a helically formed wire having end turn portions at ends thereof, a plurality of first rough surfaces, each including first shot peening indentations formed on a part of a surface of the end turn portions, and a second rough surface including second shot peening indentations formed on the entire surface of the wire except for the first rough surface. The second rough surface has a surface roughness different from that of the first rough surface.