| 摘要 |
1,172,647. Injection moulding. A. FISCHBACH. 16 April, 1968 [26 April, 1967], No. 17946/68. Heading B5A. Mould parts on fixed and movable platens 6 and 5 respectively are brought to a closed position in two stages, in the first of which the platen 5 is moved forward by hydraulic pistons and cylinders 7a, 7b, 8a, Sb on a stationary wall 2; in the second stage a piston rod 10 fixed to the platen 5 and slidable through a piston 12 in the wall 2 is hydraulically urged forwardly by that piston. In one embodiment the latter carries locking elements 14a, 14b pivoted at 15a, 15b which, during the first stage, are urged out of engagement with the piston rod by hydraulic cylinders 18a, 18b; at the end of this stage the cylinders are de-energized and the locking elements brought into contact with a recessed part of the piston rod by a spring 20, so that when the piston is moved forward the keys abut a shoulder 11a to move the rod and hence the platen 5 to a final mould closing position. In a modification the piston carries a pair of radially slidable locking elements which engage a recessed part of the piston rod, and are actuated by a rotary plate carried by the piston and which has cam slots engaging pins on the elements.
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