Method of making bellows pipe

Details Method of making bellows pipe Method of making bellows pipe

1991-01-09

1991-12-24

Larson, Lowell A.

Metal deforming

By tool-couple pressing together adjacent surface portions...

To form helically-seamed tube

138135, 29509, B21C 3712, F16L 1100

Patent

active

050741381

ABSTRACT:
A bellows pipe construction and method for manufacturing are disclosed wherein helically wound coils of logitudinally corrugated strip are joined with an interlocking seam. Thereafter, the interlocking seam is deformed to position the edges of the strip in substantial parallelism with the axis of the pipe. The resulting pipe can be extended or shortened for installation and will further adjust and accommodate ground movement without substantial loss of strength.

REFERENCES:
patent: 3566643 (1971-03-01), Westerbarkey
patent: 3815639 (1974-06-01), Westerbarkey
patent: 4377188 (1983-03-01), Siegwart
patent: 4481978 (1984-11-01), Escandell

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