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. 21, 2017
Filed:
Mar. 28, 2014
Applicant:
Nisshin Steel Co., Ltd., Tokyo, JP;
Inventors:
Ryuji Tanoue, Sakai, JP;
Hirokazu Sasaki, Sakai, JP;
Naofumi Nakamura, Sakai, JP;
Jun Kurobe, Sakai, JP;
Assignee:
NISSHIN STEEL CO., LTD., Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21C 37/15 (2006.01); B21C 37/20 (2006.01); B21D 17/04 (2006.01); B21D 41/04 (2006.01); B21C 5/00 (2006.01); B21K 21/12 (2006.01); B21D 17/02 (2006.01);
U.S. Cl.
CPC ...
B21C 37/154 (2013.01); B21C 37/155 (2013.01); B21C 37/202 (2013.01); B21D 17/04 (2013.01); B21D 41/04 (2013.01); B21C 5/00 (2013.01); B21C 5/003 (2013.01); B21D 17/02 (2013.01); B21K 21/12 (2013.01);
Abstract
A method of manufacturing a rectangular tube having a stepped portion includes: forming V-shaped grooves on a rectangular tube at surfaces of an end thereof in a direction parallel to a longitudinal direction thereof; and pressing each of the surfaces having the V-shaped grooves formed thereon with a rotating roll from outside to inside, whereby the end of the rectangular tube is radially reduced.