Thin-walled metal duct having integral reinforced coupling ends

Details Thin-walled metal duct having integral reinforced coupling ends Thin-walled metal duct having integral reinforced coupling ends

1978-01-11

1982-05-04

Bryant, III, James E.

Pipes and tubular conduits

Combined

With end structure

138121, 138122, 138135, 138154, 138174, F16L 918, F16L 900

Patent

active

043277764

ABSTRACT:
Thin-walled metal duct particularly useful for heating and air-conditioning purposes is usually made by grooving, spiral wrapping, and seaming strips of thin metal sheet. The resultant tubular form provides the necessary rigidity to resist collapse of the tubular form. In the past, at least one end of the ribbed tubular ducts have been reformed to permit the ducts to be joined together. The end reforming techniques of the past have resulted in reformed ends having insufficient rigidity and strength to resist the abuse the ducts frequently receive in shipping, storing, handling, and installation.
The present product, method, and apparatus provide a ribbed thin-walled tubular duct having reformed ends with rigidity and strength superior to the prior art products. This achievement is accomplished in the present invention by moving more metal into the end portion of the duct prior to reforming the end portion, thus reinforcing the end portion of the duct.

REFERENCES:
patent: 525061 (1894-08-01), Schmidt et al.
patent: 1315548 (1919-09-01), Fletcher et al.
patent: 1340818 (1920-05-01), Brinkman
patent: 2818281 (1957-12-01), Kurti
patent: 2822194 (1958-02-01), Fentress
patent: 2986169 (1961-05-01), McCormick
patent: 3101209 (1963-08-01), Jorgenson
patent: 3207538 (1965-09-01), Pattillo
patent: 3738394 (1973-06-01), Westerbarkey
patent: 3758139 (1973-09-01), Meserole
patent: 3794364 (1974-02-01), Williams

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