Metal working – Method of mechanical manufacture – Structural member making
Reexamination Certificate
2011-04-26
2011-04-26
Cozart, Jermie E (Department: 3726)
Metal working
Method of mechanical manufacture
Structural member making
C029S557000, C072S370010, C072S370100, C072S370140, C072S370240, C072S370250
Reexamination Certificate
active
07930826
ABSTRACT:
When an outer circumference of a clamping portion25and an outer circumference of a circular outer circumference26are restrained by a die6while inserting a non-circular punch5into a circular hole28, paddings27, 27are pressed by a semi-circular inner circumference of the die6to thereby be forced into interior of the circular hole28. The volume of the paddings27, 27is set to be substantially the same as a volume obtained by subtracting the volume of a non-circular hole23in an extension shaft2from the volume of the circular hole28. The circular hole28is deformed, and the paddings27, 27forced into the circular hole28abut with inclined planes52, 52of the punch5, whereby the non-circular hole23is formed in the extension shaft2.
REFERENCES:
patent: 3867050 (1975-02-01), Pitner
patent: 1138540 (1996-12-01), None
patent: 196 16 274 (1996-12-01), None
patent: 199 25 701 (1999-12-01), None
patent: 1223828 (1969-10-01), None
patent: 658124 (1994-08-01), None
patent: 200097245 (2000-04-01), None
Chinese Office Action dated Mar. 6, 2009.
Inoue Koji
Marumo Koji
Okada Junichi
Watanabe Yasushi
Cozart Jermie E
Gunma Seiko Co., Ltd.
NSK Ltd.
Sughrue & Mion, PLLC
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