| 摘要 |
A device for producing tubular sockets provided with an outwardly extending annular enlargement and made of plastic material comprises a removable annular core having a diameter equal to the desired inner diameter of the socket and a ring on said core for forming said enlargement, said ring being removably mounted on said core. The ring is subdivided into at least three segments which are hingedly connected with each other, except that the abutting ends of two segments are bevelled and form sharp points and are merely clamped together, so that after the removal of the core from the socket which has been molded on the combined core and ring, the latter may be collapsed by swinging the segments of the same inwardly about their hinges into bore of the socket and then may be removed from the bore, because the largest dimension of the collapsed ring is smaller than the diameter of the bore in the socket formed by the cylindrical core.
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