Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
2005-12-15
2009-12-15
Bryant, David P (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C123S090390, C123S090410
Reexamination Certificate
active
07631425
ABSTRACT:
A method for manufacturing according to the present invention includes a step of obtaining a bent workpiece13with prepared apertures21and21, wherein the bent work piece13includes a pair of side walls20and20disposed in parallel with each other and connecting walls30and40for connecting the side walls20and20, the pair of side walls20an d20each having a prepared aperture21, and a step of forming a roller supporting shaft fixing aperture25by inserting a sizing punch60into the prepared aperture21, wherein the sizing punch60has a tapered push enlarging portion61at a tip end portion, a basal end side of the push enlarging portion being larger than the prepared aperture21in diameter, and a tip end side of the push enlarging portion61being smaller than the prepared aperture21in diameter, whereby the push enlarging portion61causes 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 aperture25. 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.
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Machine Translation of JP2004-176557.
Japanese Office Action w/ English Translation dated Dec. 16, 2008.
Japanese Office Action dated Apr. 14, 2009 with English Translation.
Kamiji Michiyuki
Kawatake Yoshio
Bryant David P
Kratz Quintos & Hanson, LLP
Nakanishi Metal Works Co. Ltd.
Walters Ryan J
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