Improvements in and relating to machines for forming...

Details Improvements in and relating to machines for forming... Improvements in and relating to machines for forming...

B - Operations, Transporting

21

C

B21C 37/12 (2006.01)

Patent

CA 2125295

2125295 9407620 PCTABS00032 In a machine for the formation of helical lock-seam tubing, guide rollers (24A, 25B) are arranged to locate superposed metal strips (9, 11) in laterally staggered relative positions in such a manner that the strips can be passed through forming and clinching means whilst in the overlapped state, whereby finished tubing has a locked seam with each of the walls joined in the seam being formed by multiple layers of metal strip.

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