Flexible cylindrical metal tube

Details Flexible cylindrical metal tube Flexible cylindrical metal tube

1973-10-26

1976-02-17

Aegerter, Richard E.

Pipes and tubular conduits

Flexible

Corrugated

138135, 138155, F16L 1100, F16L 1116

Patent

active

039385582

ABSTRACT:
Corrugated, flexible, metal duct formed of a helically wound strip of lightweight metal characterized by a pair of interlocked U-shaped seam elements which constitute one leg of a common corrugation of contiguous convolutions of the strip and extend radially throughout the length of that leg so that the areas at the base of each U-shaped seam element abuts against the adjacent corrugation leg and is locked against separation thereby. Apparatus which makes such duct through the use of rollers only and void of any mandrel means is also shown.

REFERENCES:
patent: 3331400 (1967-07-01), Vilkaitis
patent: 3435852 (1969-04-01), Trihey
patent: 3682203 (1972-08-01), Foti et al.

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