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Method for introducing an internal helical formation into a flexible tubular material

  • US 20080319536A1
  • Filed: 04/10/2008
  • Published: 12/25/2008
  • Est. Priority Date: 11/20/2001
  • Status: Active Grant
First Claim
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1. A method for introducing an internal helical formation into a flexible tubular material, the method comprising supporting the material on a mandrel having a groove, placing a helical former corresponding to the groove around the material so as to deform the material to have an internal helical formation corresponding to the shape of the groove, setting the material in that configuration, and removing the former and the mandrel.

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