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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.:

US 9593731 B1

PDFFull Text
Date of Patent:
Mar. 14, 2017

Filed:

Jan. 30, 2013

Ring-shaped spring and method for manufacturing same

Applicant:

Nhk Spring Co., Ltd., Yokohama-shi, Kanagawa, JP;

Inventors:

Noritoshi Takamura, Aiko-gun, JP;

Fumio Takahashi, Aiko-gun, JP;

Assignee:

NHK SPRING CO., LTD., Yokohama, JP;

Attorney:

Oliff PLC

Primary Examiner:

Bradley King

Assistant Examiner:

Stephen Bowes

Int. Cl.
CPC ...
C22C 38/34 (2006.01); C22C 38/38 (2006.01); F16F 1/34 (2006.01); B21D 11/10 (2006.01); C21D 9/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/08 (2006.01); F16F 1/02 (2006.01); B23K 26/26 (2014.01); B23P 15/00 (2006.01); B21F 35/04 (2006.01); B23K 26/32 (2014.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01); B21D 53/16 (2006.01);
U.S. Cl.
CPC ...
F16F 1/34 (2013.01); B21D 11/10 (2013.01); B21F 35/04 (2013.01); B23K 26/26 (2013.01); B23K 26/32 (2013.01); B23P 15/00 (2013.01); C21D 9/02 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/08 (2013.01); C22C 38/18 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); F16F 1/027 (2013.01); B21D 53/16 (2013.01); B23K 2201/32 (2013.01); B23K 2203/04 (2013.01); B23K 2203/50 (2015.10); F16F 2226/048 (2013.01);
Abstract

An inexpensive ring spring having high strength and a method for producing the same, are provided. The ring spring can be obtained, for example, by raw material preparation, bending formation, welding, and disk formation performed in this order. The ring spring is formed to have no edge by welding two edge parts of the raw material, and has a welded metal part that is formed at the interface of the two edge parts of the raw material, and a welded heat-affected zone that is formed around the welded metal part and heated by welding, and exhibits tensile strength of 1000 MPa or more. Since the ring spring has sufficient tensile strength as a disk spring and a wave spring, quenching and tempering are not necessary. Furthermore, since the product can be prevented from being deformed due to quenching and tempering, dimensional accuracy of the product can be improved.

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