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. 18, 2011
Filed:
Aug. 01, 2006
Yoshio Kawatake, Osaka, JP;
Yoshio Kawatake, Osaka, JP;
Nakanishi Metal Works Co., Ltd., Osaka-Shi, JP;
Otics Corporation, Nishio-Shi, JP;
Abstract
The present invention provides a rocker arm manufacturing method capable of stably forming valve stem guide walls. In the method according to the present invention, an intermediate producthaving both side wallsextended in a predetermined direction and arranged in parallel with each other and a one end side connection wallconnecting lower ends of both the side wallsat a longitudinal one end of the product is obtained. Next, a first pressing punchis pressed against the outer surface portions of both the side wallsfrom the outside thereof to cause downward plastic flows of regions of the outer surface portions of both the side walls positioned below the cutout portionsto thereby form raising wallsin a downwardly protruded manner at both sides of the one end side connection wall. Thereafter, valve stem guide wallsare formed by pressing second pressing punchesagainst both the raising wallsof the one end side connection wall