Patent ID: 7347962

Claim:
Apparatus for manufacturing a socket end of a pipe part, which socket end is provided, on the inner side, with a sealing ring which is fixedly connected thereto, the socket end being manufactured from a relatively rigid thermoplastic material and the sealing ring being manufactured from a thermoplastic elastomer which is compatible therewith, and the socket end comprising a first cylindrical part of a defined internal diameter, a groove part which axially adjoins the first cylindrical part on the outer side and has a larger internal diameter than that of the first cylindrical part, in which groove part the sealing ring is arranged, and an edge part which adjoins the groove part and has a smaller internal diameter than that of the groove part, which apparatus comprises: an outer mould for forming the outer contour of the sealing ring and for forming the outer side of the socket end, and a core for forming the inner side of the socket end and the sealing ring, characterized in that the core comprises a first core part, a sleeve-like core part, which can be displaced on the first core part in the axial direction between an outermost position and an innermost position, for forming a front for the sealing ring and the inner side of the edge part, a contractible core part, which adjoins the first core part in the axial direction and can be moved in the radial direction between an outermost position and an innermost position, for forming the inner contour of the sealing ring, and a second core part, which adjoins the contractible core part in the axial direction, for forming the inner side of the pipe part, the radially contractible core part, in the radially innermost position, having an external diameter-which is smaller than the internal diameter of the sleeve-like core part.