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Fitting assembly for flexible tubing

  • US 3,958,818 A
  • Filed: 10/21/1974
  • Issued: 05/25/1976
  • Est. Priority Date: 08/28/1972
  • Status: Expired due to Term
First Claim
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1. A fitting assembly for connection to the end of a flexible tubing formed by coils of spirally wound resilient thread, said assembly comprising:

  • a first coupling part having a threaded bore for threadedly engaging the coils of the flexible tubing with a portion of the coils at the end of the tube having been passed through the first coupling part;

    a second coupling part having means for engaging the end of the tube and detachably interengaging the first coupling part to compress the portion of the coils at the end of the tube together and radially expand the tube in the compressed region as the first and second coupling parts are brought together for engagement; and

    a third coupling part disposed intermediate the first and second coupling parts and attached to the first coupling part, said third coupling part having an interior surface portion adapted to be spaced from peripheral surface regions of the tube before compression of the coils and frictionally engageable with said surface regions after compression when the first and second coupling parts are interengaged, thereby tightly retaining the fitting assembly onto the tube with the compression of the coils further preventing the coils from threadedly passing back through the threaded bore of said first coupling part.

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