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:
Aug. 06, 1985
Filed:
Feb. 16, 1984
Akira Ohno, Yokohama, JP;
Hiroshi Koyama, Yokohama, JP;
Kanji Inoue, Kamakura, JP;
Hiroaki Ozawa, Yokohama, JP;
NHK Spring Co., Ltd., Yokohama, JP;
Abstract
A hollow stabilizer manufactured from a material obtained by adding a minute amount (0.001-0.01% by weight) of boron to either a carbon steel tubing having a relatively low carbon concentration of 0.20-0.35% for mechanical and structural purposes or to a carbon steel tubing for general structural purposes. The carbon steel tubing thus provided is bent in a prescribed stabilizer form. The bent tubing is water quenched, for example, to a greater hardness than HRC 43. The water-hardened bent tubing is later tempered to a hardness HRC, ranging between 36 and 43, at a temperature of, for example, 300.degree.-380.degree. C. for a proper length of time. The hollow stabilizer obtained by the aforementioned heat-treating steps has a much greater fatigue strength.