Method of manufacturing helically wound tubes and tubes manufact

Details Method of manufacturing helically wound tubes and tubes manufact Method of manufacturing helically wound tubes and tubes manufact

1979-07-03

1984-11-13

Moon, Charlie T.

Pipes and tubular conduits

Flexible

Corrugated

29429, 29505, 29509, 138150, 138154, 138173, F16L 1100, B21D 3903, B23P 1100

Patent

active

044819781

ABSTRACT:
A typical embodiment of the invention produces helically wound tubes from strips of thin plate in which adjacent edges are provided with interlocking ribs that are folded over to form a compressed bead. A further rib is formed at the bead, the bead providing one of the sides of the new-formed rib.

REFERENCES:
patent: 3621884 (1971-11-01), Trikey
patent: 3815639 (1974-06-01), Westerbarkey
patent: 3938558 (1976-02-01), Anderson
patent: 4029129 (1977-06-01), Harper
patent: 4108212 (1978-08-01), Anderson et al.
patent: 4160312 (1979-07-01), Nyssen

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