| 摘要 |
A coupling for engagement with the outer surface of a polymeric pipe, having a s ub-assembly of a compression sleeve (24), a resilient gasket ring (18) permanently attached to the inner end of the compression sleeve (24), a gripping member (25), and a nut (30). The gasket ring (18) encounters an abutment in a socket (17) in the body (12) as the nut ( 30) is tightened, and further tightening of the nut (30) radially compresses the gripping member (25) so that its inwardly directed barbe d projections (26) engage the outer surface of a pipe (11) to which the coupling is attached. The end of pipe (11) is freely insertable thr ough the gripping member (25) and sleeve (24), and into the socket (17) in the body (12). There are also provided abutment surfaces within t he body of the coupling and the nut which abut inner and outer surfaces (34, 35) of a flange outstanding from the outer end of the compre ssion sleeve (24). Also disclosed is an embodiment with a transition spigot (46) having a barbed tail inserted into an end of a pipe ena bling toe coupling to accommodate a range of similar but different diameter pipes.
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