Coupling device for tubular members
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A coupling device includes a nut releasably engaging a body which receives a tubular member. A sleeve which attaches to the nut telescopes over the tubular member and includes grooves for gripping the tubular member and an undercut recess for carrying a seal. An outer recess on the sleeve receives an inturned flange on the nut for attaching the nut and sleeve. A leading edge on the sleeve abuts the body and the inturned flange is movable from a first cylindrical section formed by the outer recess to a second cylindrical section via a tapered surface to radially contract the sleeve thereby engaging the grooves with the tubular member. The nut carries a major portion of the sleeve and the seal within an inner bore on the nut and the sleeve, seal and nut comprise a unitary assembly for telescoping over the tubular member.
129 Citations
5 Claims
- 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.
- 4. A coupling for tubes, comprising a body having a bore to receive a tube and having an abutment surface surrounding the outer end of said bore, said abutment surface including a transverse face, a nut threadedly engaged with the body and having a tapered camming surface axially spaced from the body to form a chamber between the nut, body and tube, a sleeve within said chamber and having a recess, a sealing ring of deformable material having a first portion within said recess and a second portion extending axially inwardly of the sleeve toward said abutment surface, said sleeve having a transverse face engageable with said transverse face of the body and having a radially contractible portion toward its axially outer end and having a bore of a diameter to receive the tube, said contractible portion being engageable by said camming surface for moving the sleeve axially toward the body and for contracting the radially contractible portion into engagement with the tube, said sleeve bore having a smooth portion radially opposite an axially outer part of the contractible portion and terminating in a serrated portion radially opposite an axially inner part of the contractible portion and immediately adjacent said smooth portion whereby upon threading of the nut onto the body the smooth portion of the bore will be contracted into engagement with the tube first and followed by contraction of the serrated portion into engagement with the tube.
Specification