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:
Jul. 27, 1999
Filed:
Apr. 09, 1997
Applicant:
Inventors:
Hidemitu Hamano, Kasakakemachi, JP;
Yutaka Mihara, Tokyo, JP;
Tetsuji Egawa, Okazaki, JP;
Takashi Suzumura, Toyota, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72 58 ; 72 62 ;
Abstract
According to a hydraulic bulge forming method, a bend pipe is inserted in a cavity, and when the bend pipe is subjected to bulge forming, the bend pipe is elastically deformed by supplying a pressure medium to an interior of the bend pipe so that an inside of the bent portion is bulged along a bulging region formed at a portion of the cavity corresponding to an inside of a bent portion of the bend pipe. Whereby a reduction in a wall thickness of the outside portion of the bent portion is suppressed, so that a danger of causing breaking can be prevented.