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:
Apr. 03, 2012
Filed:
Sep. 27, 2007
Applicants:
Yoshihiro Shimada, Kaga, JP;
Nobuyuki Matsui, Kaga, JP;
Inventors:
Yoshihiro Shimada, Kaga, JP;
Nobuyuki Matsui, Kaga, JP;
Assignee:
Daido Kogyo Co., Ltd., Kaga, Ishikawa Pref., JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16G 13/08 (2006.01); F16H 7/06 (2006.01); B21L 9/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A bush is pressed into a link plate in a turning link rank that turns relatively with a pin. The bush is molded into a seamless cylindrical shape by cold-forging and is coated with a metal carbide layer formed by cementation of chrome, vanadium and other metals and having Vickers hardness of 1300 Hv or more similarly to the pin. Afterwards, the bush is treated by a quenching, tempering or isothermal transformation process. Thereby, wear resistance of the pins and the link plates of a silent (link) chain is improved, productivity is improved and associated costs are reduced.