Thin-walled metal duct having integral reinforced ends for joini

Details Thin-walled metal duct having integral reinforced ends for joini Thin-walled metal duct having integral reinforced ends for joini

1975-11-10

1977-08-30

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72367, 113116UT, 138173, B21D 5112

Patent

active

040445810

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: 1120267 (1914-12-01), Brinkman
patent: 2845988 (1958-08-01), Andersen
patent: 3548623 (1970-12-01), Hess et al.
patent: 3608182 (1971-09-01), Hughes et al.
patent: 3738394 (1973-06-01), Westerbarkey

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