Assembly of multi-use torque fitting and length of tubing having compressible seal

  • US 7,954,857 B2
  • Filed: 03/10/2008
  • Issued: 06/07/2011
  • Est. Priority Date: 04/27/2006
  • Status: Active Grant
First Claim
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1. An assembly comprising a torque fitting and a length of tubing, wherein:

  • the torque fitting comprises a threaded body portion, a torque-limiting body portion, and a tubing channel;

    the threaded body portion and the torque-limiting body portion are arranged concentrically along a longitudinal axis of the fitting;

    the tubing channel is oriented along the longitudinal axis of the fitting extending through opposite ends of the fitting and defines a cross-sectional area sufficient to accommodate the length of tubing along the longitudinal axis;

    the threaded body portion comprises a sealing edge on the underside of the threaded body portion at one of the opposite ends of the fitting and a mechanical thread defining a compressive direction of rotation and a decompressive direction of rotation;

    the threaded body portion and the torque-limiting body portion are configured such that,below a threshold level of torque applied to the torque-limiting body portion, rotation of the torque-limiting body portion in the compressive direction of rotation forces the threaded body portion to rotate with the torque-limiting body portion,above the threshold level of torque applied to the torque-limiting body portion, rotation of the torque-limiting body portion in the compressive direction of rotation fails to force the threaded body portion to rotate with the torque-limiting body portion, such that the torque-limiting body portion continues to rotate in the compressive direction of rotation but the threaded body portion fails to rotate, androtation of the torque-limiting body portion in the decompressive direction of rotation forces the threaded body portion to rotate with the torque-limiting body portion,one of the threaded body portion or the torque-limiting body portion comprises a lever having a first arresting surface and a yielding surface, and the other of the threaded body portion or the torque-limiting body portion comprises an abutment having a second arresting surface and an engaging surface;

    the lever and the abutment are configured such that, when torque above the threshold level is applied by rotating the torque-limiting body portion in the compressive direction of rotation, the engaging surface contacts the yielding surface, the lever flexes toward the body portion comprising the lever and away from the body portion comprising the abutment, and the lever bypasses the abutment;

    the length of tubing comprises a compressible seal formed at an end of the length of tubing; and

    the length of tubing is accommodated by the tubing channel of the torque fitting to extend from the opposite ends of the fitting such that the compressible seal is positioned on the underside of the threaded body portion to cooperate with the sealing edge to prevent fluid leakage when the assembly is applied to a fluid-handling device.

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