| 摘要 |
<p>PCT No. PCT/GB95/00720 Sec. 371 Date Dec. 26, 1996 Sec. 102(e) Date Dec. 26, 1996 PCT Filed Mar. 29, 1995 PCT Pub. No. WO95/26873 PCT Pub. Date Oct. 12, 1995An electrofusion coupler, for connecting plastics pipes end to end, is formed using a mandrel 10 having at spaced apart locations therealong first and second terminal holder 14. Each terminal holder 14 receives a malleable metal terminal pin 30, and has a diametral slot 26 for receiving an electrical resistance wire 20 which is extended across one terminal holder 14, wound in a plurality of turns around the mandrel 10 and is extended across the other terminal holder 14. Malleable terminal pins 30 are driven into the terminal holder, along the axis of the pin, so that the inner end of the pin is crimped onto the wire to grip it firmly. The mandrel 10, is then placed in an injection mould, an electrofusion sleeve injection moulded around the wound mandrel 10, terminal pins 30 and holders 14, the terminal pin holders 14 are withdrawn radially into the mandrel 10 and the electrofusion coupler stripped axially from the mandrel.</p> |
