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:
Jun. 11, 1996
Filed:
Sep. 30, 1994
Applicant:
Inventors:
Takafumi Asada, Hirakata, JP;
Masato Morimoto, Neyagawa, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21C / ; B21D / ;
U.S. Cl.
CPC ...
72 201 ; 29 9001 ; 2989802 ; 2989813 ; 72 75 ; 723546 ;
Abstract
A plurality of processing balls with different outer diameters are prepared at a slidable or rotatable upper stage. One ball, selected from the plurality of prepared balls in correspondence with the inner diameter of a bore of a workpiece, is inserted through the bore while being pressed by a pin.