| 摘要 |
1,086,956. Forming lateral necks on hollow thermoplastic bodies. DYNAMIT NOBEL A.G. Oct. 2, 1964 [Oct. 2, 1963], No. 40358/64. Heading B5A. In a method of forming a lateral neck on a hollow thermoplastic body, an opening having a diameter less than the internal diameter of the neck is formed in the wall of the body, the wall is heated in the region of the opening and the wall surrounding the opening is gripped by means of a tool arranged externally of the body and drawn outwardly and expanded by the tool until the neck diameter is of the desired value after which the thermoplastic material is cooled while the tool maintains the internal diameter of the neck constant. As shown, a pipe 1 is clamped between flange 10 screwed on to cylinders 11 of supports 15 each movable on guide rails 12 on a table 13 and secured thereto by a clamp 14. A plate 17 covers the pipe on the side having the opening 5, an opening 16 in the plate corresponding to the opening 5. The tool for forming the neck comprises a mandrel 6 having a spiral worm 7 at one end and connected to a spindle 9 at the other. The spindle has a screw-thread of smaller pitch than the spiral worm 7 and is mounted in a threaded block 18 fixed on a plate 19 which can swivel about pivot 20 and be locked to the table by clamping means. In operation the spindle is rotated either manually or by a motor causing the mandrel to penetrate the opening 5 and enter the pipe whereby the wall surrounding the opening is forced outwards and expands around the mandrel until the final position is reached. Cooling is effected and the mandrel retracted after which an auxiliary pipe can be inserted into the neck and adhered thereto. The mandrel may be shaped to provide a neck which tapers and may be of the same diameter as the internal diameter of the pipe 1.
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