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Process for reducing the internal cross section of elastomeric tubing

  • US 5,114,636 A
  • Filed: 01/14/1991
  • Issued: 05/19/1992
  • Est. Priority Date: 07/31/1990
  • Status: Expired due to Term
First Claim
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1. Process of reducing the internal cross section of an elastomeric tubing for forming an elastomeric bladder therefrom, the process comprising the steps ofwrapping said tubing into a helical thread on a generally cylindrical fixture which has said helical thread formed thereon;

  • subjecting said tubing to heat treatment while the tubing is wrapped on said fixture, including elevating the temperature of said tubing to a suitable predetermined elevated temperature for a sufficient time for thermally setting said elastomeric tubing, thus forming a longitudinal fold therein; and

    removing said tubing from said fixture wherein the resulting tubing has said longitudinal fold therein which minimizes the internal cross-sectional area thereof.

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