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:
Sep. 17, 1991
Filed:
May. 12, 1989
Takahiko Sahara, Tokyo, JP;
Hisahiko Kusano, Tokyo, JP;
Masayoshi Kaneko, Tokyo, JP;
Masahiro Nakajima, Tokyo, JP;
Toshihiko Sato, Tokyo, JP;
Topy Industries Limited, Tokyo, JP;
Abstract
A heat treatment process applicable to bushings used in tracks of endless track tractor comprises heating a bushing made of middle carbon low alloy steel material from the outer peripheral surface thereof until the inner circumferential surface thereof achieves a temperature range of Ac.sub.3 .ltoreq.T.ltoreq.Ac.sub.3 +50.degree. C. where T is the temperature in .degree.C. of the heated circumferential surface and Ac.sub.3 is the transformation temperature in .degree.C. of the steel. The heating is accomplished with an induction heating whereafter the steel is cooled from the outer peripheral surface, resulting in hardening the same along the entire thickness thereof. The treatment is followed by tempering of the steel.