| 摘要 |
1,060,334. Vent-plugs for moulds. E. LENDLE. May 28, 1965 [May 26, 1964], No. 22757/65. Heading B5A. A vent plug 1 for insertion from within mould 7 into a bore (i comprises slots 2, knurling 4 and a smooth-surfaced portion 5. Preferably, the knurling is in two parts as shown. According to the invention, portion 5 allows a partial insertion without tilt, Fig. 3 (not shown), the insertion being preferably completed by using a punch (8), Fig. 4 (not shown), which causes deformation of the knurling with consequent frictional retention of the plug. The plug may protrude from the mould wall, Fig. 5 (not shown). The mould may be an injection mould and the moulding material polystyrene. |
