Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 3, 2012
Patent Application Number
12680397
Date Filed
September 27, 2007
Patent Citations Received
Patent Primary Examiner
Patent 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.
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