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:
Apr. 26, 2011
Filed:
Oct. 31, 2007
Koji Inoue, Maebashi, JP;
Yasushi Watanabe, Maebashi, JP;
Koji Marumo, Fujioka, JP;
Junichi Okada, Fujioka, JP;
Koji Inoue, Maebashi, JP;
Yasushi Watanabe, Maebashi, JP;
Koji Marumo, Fujioka, JP;
Junichi Okada, Fujioka, JP;
NSK Ltd., Tokyo, JP;
Gunma Seiko Co., Ltd., Gunma, JP;
Abstract
When an outer circumference of a clamping portionand an outer circumference of a circular outer circumferenceare restrained by a diewhile inserting a non-circular punchinto a circular hole, paddingsare pressed by a semi-circular inner circumference of the dieto thereby be forced into interior of the circular hole. The volume of the paddingsis set to be substantially the same as a volume obtained by subtracting the volume of a non-circular holein an extension shaftfrom the volume of the circular hole. The circular holeis deformed, and the paddingsforced into the circular holeabut with inclined planesof the punch, whereby the non-circular holeis formed in the extension shaft