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:
Mar. 26, 2024
Filed:
Mar. 24, 2022
Nhk Spring Co., Ltd., Yokohama, JP;
Shinichi Nishizawa, Walled Lake, MI (US);
Daisuke Ibano, Yokohama, JP;
Tsuyoshi Matsuda, Yokohama, JP;
Norifumi Arisaka, Yokohama, JP;
Shun Muramatsu, Yokohama, JP;
Chihiro Ito, Yokohama, JP;
Takuto Suzuki, Yokohama, JP;
Masatake Kinoshita, Yokohama, JP;
Asuka Kawasaki, Yokohama, JP;
NHK SPRING CO., LTD., Kanagawa, JP;
Abstract
A coil spring includes a wire rod and an elastic coat provided on the wire rod. The coil spring includes a coil section including a plurality of coil portions. The wire rod includes a round cross-sectional portion, a cross-section varying portion, and a rectangular cross-sectional portion along the longitudinal direction of the wire rod. The cross section of the rectangular cross-sectional portion is substantially square and has a first plane and a second plane. The first plane and the second plane oppose each other in the coil section. The elastic coat is provided on at least one of the first plane and the second plane. The elastic coat is continuous from the round cross-sectional portion to the cross-sectional variation portion and the rectangular cross-sectional portion.