Apparatus for making connecting pipes for connecting ducts

Details Apparatus for making connecting pipes for connecting ducts Apparatus for making connecting pipes for connecting ducts

1986-09-09

1987-11-10

Combs, E. Michael

Metal deforming

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

To form helically-seamed tube

B21C 3712

Patent

active

047048859

ABSTRACT:
A curved connecting pipe for ducts is proposed which can be manufactured at low cost. It is made by rolling spirally a long metal strip having wide portions and narrow portions alternately so that the wide portions will meet at one edge of the strip and the narrow portions will meet at the other edge. A single flange formed along one edge is received in a double flange formed along the other edge. An apparatus for making the connecting pipe is disclosed. In another embodiment, a flat edge of the strip is rested on a recessed edge and welded together.

REFERENCES:
patent: 189267 (1877-04-01), Rothan
patent: 519182 (1894-05-01), Gould
patent: 3122115 (1964-02-01), Siegwart
patent: 3220234 (1965-11-01), Harper
patent: 3606779 (1971-09-01), Parma
patent: 3651677 (1972-03-01), Siegwart
patent: 3858421 (1975-01-01), Wood

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