Split-ring type pipe couplings

Claim 1

A pipe coupling comprising a housing formed with external threads and with an internal axial bore for receiving one end of a pipe; a split-ring of hard elastic material formed with annular teeth on its inner surface and a longitudinally-extending slit for application around the pipe to be received in the bore of the housing, said split-ring further including a plurality of circumferentially-spaced, axially-extending ribs of increasing height, the top lands of which ribs define an outer tapered surface on the split-ring, the higher end of each rib being formed with an outwardly-projecting step; and a sleeve formed at one end with threads cooperable with the threads of the housing, at the opposite end with an internal conical surface engageable with the outer tapered surface of the split-ring to cause the split-ring to tightly clamp the pipe upon threading the sleeve onto the housing, and with an intermediate internal annular shoulder engageable with said outwardly-projecting steps of the ribs.