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. 01, 2008
Filed:
Mar. 18, 2002
Applicants:
Rudolf Lüthi, Niederwangen, CH;
Yasar Renkci, Bern, CH;
Hans Jöhr, Kehrsatz, CH;
Inventors:
Assignee:
Adval Tech Holding AG, Niederwangen, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D 22/00 (2006.01); B21D 19/00 (2006.01); B21D 11/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a method for the production of a rolled edge from an edge section () of a tube, wherein a flanging die is driven onto the edge section and flanges it into a roll. According to the invention, an initial area () of the edge section () is previously rolled in a positive fit manner by means of a forcibly controlled tool (). This prevents buckling of the initial area (), which has a controlled geometry as a result of rolling. The novel method is preferably used in the production of valve seats in so-called aerosol domes () for spray cans.