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:
Oct. 23, 2007
Filed:
Nov. 29, 2002
Mamoru Akeda, Yokohama, JP;
Junichi Yano, Yokohama, JP;
Isamu Okuyama, Yokohama, JP;
Akira Tange, Yokohama, JP;
Mamoru Akeda, Yokohama, JP;
Junichi Yano, Yokohama, JP;
Isamu Okuyama, Yokohama, JP;
Akira Tange, Yokohama, JP;
NHK Spring Co., Ltd., Yokohama, JP;
Abstract
Leaf springs have improved durability in spite of using inexpensive spring steel such as SUP9 and SUP11 as materials. While a spring main body, made of the spring steel in which Brinell hardness is under 555 HBW and not less than 388 HBW (corresponding to a diameter of under 2.70 mm of hardness and not less than 3.10mm of hardness on a Brinell ball mark), is maintained at 150 to 400° C., the load is applied in the direction in which the spring main body is to be used, and the first shotpeening is performed at the plane where the tensile stress acts.