Pipe joint assembly

A coupling assembly comprising:

• a first tubular member;
• a rigid receiving tubular member defining an opening adapted to receive said first tubular member, said receiving tubular member having an inner portion defining an inner bore dimensioned to receive one end of said first tubular member and an outer portion defining an internal annular cavity intersecting said inner bore and projecting radially outwardly therefrom, said annular cavity comprising an annular tapered wall portion tapered radially inwardly and projecting longitudinally toward said opening;
• an annular sealing member disposed in said annular cavity and dimensioned to be engaged between said first tubular member and said receiving tubular member;
• and
• a split lock ring formed from a length of spring material having a substantially circular transverse cross-section and disposed in said annular cavity between said annular sealing member and said opening, said lock ring having an outer circumferential surface portion adapted to engage said tapered wall portion and an inner circumferential surface portion adapted to engage an external wall portion of said first tubular member, said lock ring being adapted to expand circumferentially into said annular cavity during insertion of said first tubular member into said receiving tubular member and to be compressed between said tapered wall portion and said external wall portion in response to relative longitudinal separating movement between said first tubular member and said receiving tubular member, and said inner circumferential surface portion defining circumferentially extending knife edge means for penetrating said external wall portion so as to prevent longitudinal movement of said first tubular member relative to said receiving tubular member;
• and wherein said receiving tubular member further defines an annular divider means projecting radially into said cavity between said sealing member and said split lock ring, and said tapered wall portion terminates with a radially inwardly directed integrally formed rim defining a shoulder stop portion at an outer end of said receiving tubular member, and said shoulder stop portion is adapted to engage said lock ring in response to said separating movement.