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:
Feb. 17, 1976
Filed:
Jan. 15, 1974
Applicant:
Inventors:
Mokuji Koizumi, Hiroshima, JA;
Yukitsugu Kobayashi, Hiroshima, JA;
Hidehiko Tsukamoto, Hiroshima, JA;
Nobutaka Maeda, Hiroshima, JA;
Assignee:
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21H / ;
U.S. Cl.
CPC ...
72108 ; 72 71 ;
Abstract
A process and apparatus for rollingly forming a cylindrical member having a reduced diameter portion at its intermediate portion by using a cross-rolling forming apparatus. The width in cross-section each of the dies in the rolls of the apparatus is gradually varied or decreased as the working of the member advances by providing clearance surfaces in the beveled side surfaces of the dies at an appropriate escape angle so that the surfaces in the member which have been worked by the dies are held clear of the side surfaces of the dies.