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:
Dec. 15, 2009
Filed:
Dec. 15, 2005
Michiyuki Kamiji, Osaka, JP;
Yoshio Kawatake, Osaka, JP;
Michiyuki Kamiji, Osaka, JP;
Yoshio Kawatake, Osaka, JP;
Nakanishi Metal Works Co., Ltd., Osaka-Shi, JP;
Abstract
A method for manufacturing according to the present invention includes a step of obtaining a bent workpiecewith prepared aperturesand, wherein the bent work pieceincludes a pair of side wallsanddisposed in parallel with each other and connecting wallsandfor connecting the side wallsand, the pair of side wallsan deach having a prepared aperture, and a step of forming a roller supporting shaft fixing apertureby inserting a sizing punchinto the prepared aperture, wherein the sizing punchhas a tapered push enlarging portionat a tip end portion, a basal end side of the push enlarging portion being larger than the prepared aperturein diameter, and a tip end side of the push enlarging portionbeing smaller than the prepared aperturein diameter, whereby the push enlarging portioncauses plastic flow of an inner peripheral portion of the prepared aperture to finish the inner peripheral surface of the prepared aperture to thereby obtain a roller supporting shaft fixing aperture. By this structure, sufficient shaft holding ability can be given to the roller supporting shaft fixing aperture, and a rocker arm can be manufactured at low costs.