Method and apparatus for producing helically wound lock-seam tub

Details Method and apparatus for producing helically wound lock-seam tub Method and apparatus for producing helically wound lock-seam tub

1996-11-12

1998-02-24

Bryant, David P.

Metal working

Method of mechanical manufacture

Assembling or joining

29521, 2924358, 72 50, B21D 3900

Patent

active

057200955

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.

REFERENCES:
patent: 1718983 (1929-07-01), Schneible
patent: 2339219 (1944-01-01), Crowley
patent: 3604464 (1971-09-01), Pelley
patent: 3677046 (1972-07-01), Carroll
patent: 3940962 (1976-03-01), Davis
patent: 4706481 (1987-11-01), Castricum
Pamphlet entitled "The Round Revolution" .COPYRGT.1993 Spiro International S.A., Switzerland.

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