Machine for making corrugated flexible cylindrical duct

Details Machine for making corrugated flexible cylindrical duct Machine for making corrugated flexible cylindrical duct

1975-01-31

1976-09-28

Lanham, C.W.

Metal deforming

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

To form helically-seamed tube

B21C 3712

Patent

active

039824144

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: 1955410 (1934-04-01), Colbie
patent: 2282176 (1942-05-01), Fay
patent: 2305587 (1942-12-01), Lapp
patent: 2314510 (1943-03-01), Odor
patent: 3677047 (1972-07-01), Holyoake

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