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:
Nov. 25, 2014
Filed:
Sep. 14, 2012
Applicants:
Hiroshi Ogawa, Hashimoto, JP;
Kazuya Ogawa, Hashimoto, JP;
Michihiro Yokoyama, Tokyo, JP;
Inventors:
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 53/40 (2006.01); B21K 13/02 (2006.01); E05D 5/02 (2006.01); B21K 1/76 (2006.01); B21D 28/32 (2006.01);
U.S. Cl.
CPC ...
B21K 1/76 (2013.01); B21K 13/02 (2013.01); B21D 28/32 (2013.01); B21D 53/40 (2013.01);
Abstract
A method for manufacturing a high-strength motor vehicle door hinge from a steel plate blank includes a cold heading step of forming a cylindrical bulging portion at one end of the blank in the width direction, a shaft hole forming step of forming a shaft hole in the cylindrical bulging portion, and a shaft hole finishing step. In the shaft hole forming step, a shaft hole is formed using a first punch having a top end with a shape of a cone and a first die having an inner wall with a gap volume relative to the outer circumferential surface of the cylindrical bulging portion of the blank.