Method and apparatus for reforming round ducts into rectangular

Details Method and apparatus for reforming round ducts into rectangular Method and apparatus for reforming round ducts into rectangular

1975-01-23

1976-12-14

Duzan, James R.

Metal deforming

Process

Tube making or reshaping

72392, B21B 1702

Patent

active

039967832

ABSTRACT:
Disclosed herein is rectangular thin walled metal duct easily bendable without significantly changing the cross-sectional area at the bend. Also disclosed are methods and apparatus for forming this rectangular duct and flat/oval duct from round duct having grooves spiraling therearound.

REFERENCES:
patent: 2474887 (1949-07-01), Carswell et al.
patent: 2916076 (1959-12-01), Young
patent: 3710609 (1973-01-01), Jones

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