Pipe coupling

A pipe coupling for interconnecting a first pipe section which is slightly spaced apart from a second pipe section, each pipe section having a longitudinal center axis, each longitudinal center axis of the pipe sections being in substantial alignment, said pipe coupling comprising:

• a connector, the first pipe section being inserted within said connector and fixedly secured thereto, said connector having an outer open end defining an internal bore which is surrounded by a first internally threaded section;
• a spool section threadably connecting with said first internally threaded section;
• a retaining nut mounted around the second pipe section, said retaining nut having a second internally threaded section, said second internally threaded section to engage with said said second externally threaded section;
• a grab ring having a plurality of biting members, said grab ring surrounding the second pipe section, said grab ring being surrounded by said retaining nut;
• a back-up ring mounted between said retaining nut and said grab ring;
• a wedge ring connected to said retaining nut, said wedge ring having an annular main section that assumes an inclined position relative to said longitudinal center axis, said annular main section terminates in a sharpened free edge which is used to initiate installation of said wedge ring in its installed position by wedging said sharpened free edge between said back-up ring and said grab ring, said spool section being rotatable relative to said retaining nut and said connector which causes said connector and said retaining nut to move closer together which also causes said main section of said wedge ring to move linearly and be forced between said grab ring and said back-up ring to a further inserted position which forces said biting members into the second pipe section thereby locking together the first pipe section and the second pipe section in a fluid tight manner.