| 摘要 |
A pipe coupling comprises a slightly resilient plastics socket with an integral external peripheral projection adjacent its mouth, a resilient sealing ring having an annular sealing head inside the socket and an annular flange abutting the rim of the mouth of the socket, the sealing head being connected to the flange by an annular neck having a radial thickness less than the axial and radial thicknesses of the flange, and a locking ring of slightly resilient channel section plastics material, with the annular base of the channel section lying against the face of the flange of the sealing ring, remote from the mouth of the socket, with the annular inner side of the channel section locking ring lying against the inside face of the flange of the sealing ring and having an axial depth not greater than the axial thickness of the flange, and with the annular outer side of the channel section locking ring overlapping the outside of the mouth of the socket and having on its inner face an integral peripheral projection engaging behind the projection round the outside of the socket.
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