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:
Feb. 24, 1998
Filed:
Nov. 12, 1996
Applicant:
Inventor:
Kenneth Lennartsson, Torekov, SE;
Assignee:
Protol A.G., Glarus, CH;
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
29509 ; 29521 ; 2924358 ; 72 50 ;
Abstract
In a method for producing helically wound lock-seam tubing, a metal strip is fed to a forming heed in which the tubing is formed. In order to prevent lock-seam slip, a clinching roller device forms interlocking spaced deformations on the lock-seam. An apparatus for such production comprises a clinching roller provided with a recess for forming the deformations against a counter roller.