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. 24, 1997
Filed:
Dec. 04, 1995
Applicant:
Inventors:
Assignee:
Aisin Seiki Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72129 ; 72181 ; 225-2 ; 225-3 ;
Abstract
A method for producing a roll forming allows the hemming step and the roll-forming step to be contiguously performed in a single production line. The first ripping step (E) tears off a side edge strip along the first groove formed by the first grooving step (B) to form a first edge portion having a gradually changed sectional shape. At least the first grooving step (B) and the first ripping step (E) are performed contiguously with the roll-forming step (A) by utilizing the sheet or product conveyance force provided in the roll-forming step (A).