| 摘要 |
986,649. Seaming non-metallic sheet material; moulding joins in cable sheaths. STANDARD TELEPHONES & CABLES Ltd. July 20, 1962, No. 28063/62. Headings B5A and B5K. [Also in Division H2] In a method of jointing plastics cable sheathing 5 in which a tube 3 of plastics material surrounding a bared portion 4 of the cable sheath is moulded thereon at both ends, a member 42 is provided, interposed between the moulded surfaces of the sheath and the plastics tube, which agitates the surfaces to be joined to ensure complete fusion round the sheath periphery. In operation, collars of paper strip are wound on the 'polythene sheath 5, aluminium reinforcing tapes are wound round the sheaths 5 and the polythene tube 3 is placed over the exposed core portions. A mould 1 having water cooling blocks 44 and 49 is then assembled complete with guide rails 8, 9, 10 and 11, and bridge pieces 12, after being heated to its moulding temperature, and is then slid along the cable 2 together with associated guides 20, 21, so that the end of the polythene tube is heated and moulded to fill the bottle-neck shaped moulding cavity 18. When the end of the tube 3 has been moulded, a metal tape 42 (Fig. 2), threaded through a slot 27 between the halves 6 and 7 of the mould and passing between the surfaces of the sheath and tube, is pulled alternately in one direction and the other absorbing heat in so doing and transferring it to the sheath to melt it. The complete mould assembly is then rotated through 180 degrees and the operation of the tape is repeated to ensure complete treatment of the whole sheath circumference. When both: surfaces are ready for fusion, the tape 42 is withdrawn by removal of one of its handles 43. Oxidized polythene around the sheath may be removed by withdrawing the tape while rotating the mould in the opposite direction. The other end of the polythene tube 3 is sealed in like manner. The metal tape 42 may be independently heated electrically. |
