APPARATUS AND METHOD FOR MANUFACTURING A SPIGOT END OF A PIPE PART PROVIDED WITH A SEALING RING

Apparatus for manufacturing a socket end ( 12 ) which is provided with a sealing ring ( 9 ). The apparatus comprises an outer mould ( 1 ) for forming the outer contour of the sealing ring ( 9 ) and for forming the outer side of the socket end ( 12 ), and a core for forming the inner side of the socket end ( 12 ) and the sealing ring ( 9 ). The core comprises a first core part ( 7 a), a sleeve-like core part ( 7 ) which can be displaced on the first core part ( 7 a), for forming a front for the sealing ring ( 9 ), a core part ( 8 ) which adjoins the first core part ( 7 a) and can be contracted in the radial direction, for forming the inner contour of the sealing ring ( 9 ), and a second core part ( 6 ), which adjoins the contractable core part ( 8 ), for forming the inner side of the pipe part. The contractable core part ( 8 ) has a radially innermost position with an external diameter which is smaller than the internal diameter of the sleeve -like core part ( 7 ).