Injection moulding machine

Claim 1

IN AN INJECTION MOULDING MACHINE OF THE TURRET TYPE INCLUDING A FRAME, A BOLSTER MOUNTED ON SAID FRAME AND ROTATABLE THROUGH SUCCESSIVE STATIONS, MEANS FOR INDEXING SAID BOLSTER TO SAID STATIONS IN TURN, A PLURALITY OF MOLDS CARRIED BY SAID BOLSTER, EACH SAID MOLD COMPRISING AN UPPER CAVITY PART AND LOWER THREADED CORE PART SEPARABLE FROM SAID UPPER CAVITY PART, THE IMPROVEMENT CONSISTING IN SAID LOWER CORE PART BEING COUPLED TO A MANDREL ROTATABLE IN A THRUST PLUNGER VERTICALLY MOVABLE IN THE BOLSTER, A FIXED TRACKWAY BENEATH SAID BOLSTER SUPPORTING SAID THRUST PLUNGERS, SAID TRACKWAY BEING STEPPED ALONG PART OF ITS LENGTH CORRESPONDING TO A MOLD OPENING STATION TO PERMIT SAID THRUST PLUNGER AT SAID STATION TO PASS DOWNWARDLY AND CARRY SAID CORE PART AWAY FROM SAID UPPER CAVITY PORTION OF SAID MOLD AT SAID STATION, A CONTINUOUSLY DRIVEN SPINDLE VERTICALLY SHIFTABLE ON SAID FRAME AT SAID MOLD OPENING STATION AND POSITIONED IN ALIGNMENT WITH SAID MANDREL, AND MEANS FOR RAISING SAID SPINDLE INTO DRIVING ENGAGEMENT WITH SAID MANDREL, WHILST SAID CORE PORTION IS IN LOWERED POSITION, FOR ROTATING SAID CORE PART.