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PLUG DEVICES

  • US 3,804,126 A
  • Filed: 08/14/1972
  • Issued: 04/16/1974
  • Est. Priority Date: 08/16/1971
  • Status: Expired due to Term
First Claim
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1. A plug device for fitting tightly within a tube, which plug device comprises a hollow deformable sleeve member having an internal screw thread, a body member fitting within the sleeve member and having an external screw thread engaging the internal thread of the sleeve member, annular recesses being formed in both the internal wall of the sleeve member and external wall of the body member arranged so that the two recesses are aligned and face each other when the body member is screwed into the sleeve member, and a resilient ring member fitting tightly within the two recesses so as to urge the sleeve member outwardly around the annular recesses to form a tight seal when located in a surrounding tube and to resist unscrewing of the body member from the sleeve member.

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