Method of and means for forming and sealing helically wound...

Details Method of and means for forming and sealing helically wound... Method of and means for forming and sealing helically wound...

F - Mech Eng,Light,Heat,Weapons

16

L

26/155, 189/53

F16L 9/00 (2006.01) B21C 37/12 (2006.01) B29C 53/78 (2006.01) F16L 9/16 (2006.01) F16L 11/16 (2006.01)

Patent

CA 1235666

ABSTRACT A strip adapted to form a tube by helically winding and having a series of longitudinal ribs upstanding from a base on the strip and transversely spaced thereon in which one rib has a bulbous end portion and another has a bulbous longitudinal socket to form interengaging means when helically wound, all or some ribs optimally defining a hollow whereby limited lateral stretch at the join and ribs is permitted. The hollow can be closed by a flap.

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