Manufacture of helically corrugated conduit

Details Manufacture of helically corrugated conduit Manufacture of helically corrugated conduit

B - Operations, Transporting

21

D

B21D 15/04 (2006.01) B21C 37/20 (2006.01) F16L 9/06 (2006.01) F16L 11/15 (2006.01) F28D 7/02 (2006.01) F28F 1/08 (2006.01)

Patent

CA 2145292

This invention concerns the manufacture of helically corrugated conduit having at least a portion of its length corrugated in the form of at least one helix. The method includes the driving of a smooth walled tube into a forming head having forming wheels which engage the outside of the tube and the wheels are at an angle relative to the longitudinal axis of the tube. The form- ing wheels form the helical spiral as part of a cold rolled forming process. More than one helical spiral can be formed simultane- ously using a multiplicity of forming wheels.

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