Pipe coupling

Claim 1

In pipe coupling apparatus, the combination comprising: a housing having an open axial end for telescopically receiving the plain end of a pipe to which connection is to be made; a first split gripping ring mounted in said housing having an outer cam surface tapered radially inwardly toward said open housing end and an inner generally cylindrical gripping surface having teeth for gripping said plain pipe end; a second split gripping ring mounted in said housing and having an inner axially tapered cam surface and an outer generally cylindrical gripping surface having teeth for gripping the internal surface of said housing; an annular frusto-conical shaped annular split bowl mounted in said housing and axially movable relataive to said gripping rings and said housing, said bowl having an outer tapered camming surface engageable with said second gripping ring and an inner axially tapered camming surface mateably engageable with the outer tapered surface of said first gripping ring, for camming said first gripping ring inwardly to grip said pipe and said second gripping ring outwardly to grip said housing when said bowl is moved axially relative thereto; annular seal means mounted in said housing axially adjacent said bowl for engaging said pipe upon axial compression thereof to effect a seal between said housing and said pipe; an axially movable annular thrust member mounted axially adjacent said seal means for axially compressing said seal means against said bowl to effect a seal as aforesaid, said seal means, during compression thereof, causing movement of said gripping rings to said gripping positions; and a plurality of generally axially extending bolts threadably engaged in a portion of said housing for applying axial force to said thrust member to move said seal means, said bowl, and said gripping rings as aforesaid.