Conduit making machine with diameter control and method

Details Conduit making machine with diameter control and method Conduit making machine with diameter control and method

1974-05-09

1976-03-02

Lanham, C.W.

Metal deforming

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

To form helically-seamed tube

29200B, 292025, 72 49, 72138, B21C 3712

Patent

active

039409627

ABSTRACT:
A machine and method for making spiral pipe from a continuous strip of sheet metal including a corrugating mill which forms corrugations in the strip and drives it through a three-roll bending mill which bends the strip into helical convolutions and guides adjacent edges thereof into an interlocking relationship and a pair of lock up rolls for crimping the interlocked edges of the convolutions into a continuous seam, which rolls are manually or automatically adjustable radially relative to the pipe axis whereby its diameter may be accurately controlled. Adjustment of said rolls radially inwardly effects a diameter increase whereas adjustment outwardly decreases the diameter of the pipe.

REFERENCES:
patent: 3393546 (1968-07-01), Fay
patent: 3417587 (1968-12-01), Campbell
patent: 3604464 (1971-09-01), Pelley
patent: 3614882 (1971-10-01), Malkki

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