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. 04, 2014
Filed:
Apr. 26, 2010
Applicants:
Nobuharu Kato, Nagano, JP;
Hirotaka Yamada, Nagano, JP;
Jinetsu Kano, Nagano, JP;
Takeshi Yabushita, Kanagawa, JP;
Inventors:
Nobuharu Kato, Nagano, JP;
Hirotaka Yamada, Nagano, JP;
Jinetsu Kano, Nagano, JP;
Takeshi Yabushita, Kanagawa, JP;
Assignee:
NHK Spring Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16F 1/06 (2006.01); F16F 1/04 (2006.01);
U.S. Cl.
CPC ...
F16F 1/042 (2013.01); F16F 1/04 (2013.01);
Abstract
A coil spring has a spring wire that is wound in a coil shape and whose sectional outer basic shape is circular and flat faces are formed between coil inner and outer diameter sections of a sectional outer shape of the spring wire, wherein a flattening T/W of the sectional outer shape with the flat faces in the coil axis direction is set so that a stress ratio is equal to or lower than a stress ratio of a coil spring whose sectional outer shape is circular.