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Coupling device for tubular members

  • US 4,136,897 A
  • Filed: 08/29/1977
  • Issued: 01/30/1979
  • Est. Priority Date: 04/08/1976
  • Status: Expired due to Term
First Claim
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1. A coupling for tubes, comprising a body having a bore to receive a tube and having an abutment surface surrounding the axially outer end of said bore, a portion of said abutment surface having a tapered surface, a nut threadedly engaged with the body and having a inturned flange spaced from said abutment surface to form a chamber between the nut, body and tube, a one piece sleeve within said chamber, said sleeve having an undercut internal recess, an inner end and an outer end, said sleeve also having an axially outer face engageable by the inturned flange for moving the sleeve toward the body when the nut is threaded onto the body, a sealing ring of deformable material having an enlarged diameter portion received within said recess and having a cylindrical extension projecting from the sleeve toward said tapered surface, said recess having a transverse wall at its axially outer end and having a beveled surface intersecting said transverse wall and oppositely inclined to said tapered surface, and said sealing ring having a beveled face oppositely inclined to said tapered surface and adjacent said beveled surface so that upon threading of the nut onto the body the beveled surface will engage the beveled face and the cylindrical extension will engage said tapered surface causing the sealing ring to be deformed into tight sealing engagement with said tube.

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