Patent ID: 8033578

Claim:
A cylindrical coupling having an interior diameter larger than the outside diameter of a cylindrical member to be coupled, said cylindrical coupling comprising: a stop on the interior with an inner diameter less than the outside diameter of the cylindrical member to be coupled; a cylindrical shoulder spaced between said stop and a cylindrical coupling opening, said cylindrical shoulder extending into the interior of the cylindrical coupling substantially perpendicular thereto and having an inner diameter at least as large as the outer diameter of the cylindrical member to be coupled; a retention ring having an outer diameter substantially the same as an outer diameter of said cylindrical shoulder and an inner edge having a diameter at least as large as said out diameter of said cylindrical member to be coupled, the retention ring including a plurality of spaced apart tongues projecting inwardly from said inner edge and axially inwardly of the plane of said retention ring in the direction of insertion of said cylindrical member into said cylindrical coupling, each of said tongues having an inclined end in the form of a partial helix with a sharp protuberance, said retention ring further including projections on its outer circumferential edge for engaging the inner juxtaposed surface of said cylindrical coupling, wherein said projections are embodied as barbed hooks.