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:
May. 18, 2010
Filed:
Feb. 16, 2007
Hiromu Izumida, Itami, JP;
Nozomu Kawabe, Itami, JP;
Shinei Takamura, Itami, JP;
Teruyuki Murai, Itami, JP;
Noritoshi Takamura, Kanagawa, JP;
Hiromu Izumida, Itami, JP;
Nozomu Kawabe, Itami, JP;
Shinei Takamura, Itami, JP;
Teruyuki Murai, Itami, JP;
Noritoshi Takamura, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo (SEI) Steel Wire Corp., Hyogo, JP;
NHK Spring Co., Ltd., Kanagawa, JP;
Abstract
Provided is a high-strength stainless steel spring exhibiting a good workability and having a high load characteristic. Thus, the high-strength stainless steel spring of the invention has an chemical component containing 0.04 to 0.08% by mass of C, 0.15 to 0.22% by mass of N, 0.3 to 2.0% by mass of Si, 0.5 to 3.0% by mass of Mn, 16 to 20% by mass of Cr, 8.0 to 10.5% by mass of Ni, 0.5 to 3.0% by mass of Mo, and the balance of Fe and inevitable impurities, and when the average diameter of the coil is represented by D and further the diameter of the steel wire is represented by d in the case that cross sections of the stainless steel wire are in a complete round form or the value obtained by subtracting the average coil diameter from the outer diameter of the coil is represented by d' in the case that the cross sections of the stainless steel wire are in a form other than the complete round form, the spring has a spring index D/d or D/d′ of 2 to 6.