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Pipe joint assembly

  • US 5,695,224 A
  • Filed: 08/14/1995
  • Issued: 12/09/1997
  • Est. Priority Date: 08/14/1995
  • Status: Expired due to Fees
First Claim
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1. A coupling assembly for a first tubular member, comprising:

  • a receiving member defining an opening adapted to receive said first tubular member, and having an inner portion defining an inner bore dimensioned to receive an end portion of said first tubular member, an outer portion defining a first internal annular cavity communicating with said inner bore and having a diameter greater than the diameter of said inner bore, and an intermediate portion between said inner portion and said outer portion defining a second internal annular cavity communicating with said inner bore and having a diameter greater than the diameter of said inner bore and less than the diameter of said first internal annular cavity;

    an annular locking member having an outer rim portion fitted within said first internal annular cavity, and having a slotted inner portion of generally frustoconical shape angled inboard from its outer rim portion such that its inner rim extends in its relaxed position into said inner bore, said inner rim including a circumferentially-extending knife edge for penetrating the external wall of said first tubular member to inhibit longitudinal movement of said first tubular member relative to said receiving member;

    a rigid annular stop member seated within said first internal annular cavity and abutting the outboard side of said outer rim portion of said locking member, including tongue members projecting toward said inner bore, to prevent longitudinal outboard movement of said locking member, and to prevent said locking member inner portion from bending back toward said receiving member opening;

    a deformable longitudinally sliding annular sealing member seated in said second internal annular cavity, and extending in a relaxed position into said inner bore to contact said first tubular member when said first tubular member is inserted into said inner bore to inhibit fluid leakage from said first tubular member toward said annular locking member;

    a longitudinally sliding stay member between said locking member and sealing member to prevent contact between said sealing member and said locking member and having an inner diameter nearly equal to the diameter of the inner bore; and

    a closing lip abutting the outboard side of said stop member to prevent said stop member from longitudinal outboard movement.

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