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Torsional strain relief for borescope

  • US 4,989,581 A
  • Filed: 06/01/1990
  • Issued: 02/05/1991
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Term
First Claim
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1. Torsional strain relief assembly for absorbing torsional strain at a proximal end of an elongated, flexible insertion tube of a borescope or endoscope and for mechanically coupling the insertion tube to a frame, said strain relief assembly comprising a tubular rigid sleeve;

  • means rigidly affixing a proximal end of the tubular rigid sleeve to said frame;

    a helical torsional spring situated within said tubular rigid sleeve;

    means rotationally affixing a proximal end of said spring to said frame;

    a bushing rotationally affixed to a distal end of said spring and to a proximal end of said insertion tube and rotatably mounted within said rigid tubular sleeve, permitting rotation of said insertion tube over at least a substantial rotational angle with respect to said rigid sleeve and said frame;

    such that said insertion tube is free to rotate over said substantial angle without significant twisting over the length of the insertion tube.

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