Mechanical injection molding machine

Claim 1

IN A HIGH SPEED INJECTION MOULDING MACHINE OF THE TYPE HAVING A MAIN FRAME, A MOVABLE PLATEN SECTION, A SUBSTANTIALLY FIXED PLATEN SECTION MOUNTED ON HORIZONTALLY EXTENDING BARS, THE BARS BEING SUPPORTED AT ONE END BY A PLATEN OPERATING MECHANISM HOUSING FIXED ON THE MAIN FRAME AND SECURED AT THE OTHER END TO A FIXED PRESSURE PLATE SUPPORTED BY THE MAIN FRAME, PLASTIC INJECTION MECHANISM COMPRISING, IN COMBINATION: (A) A PLASTICIZING MAGAZINE SUPPORTED IN A SUBSTANTIALLY FIXED OPERATIVE POSITION ON SAID BARS AND HAVING A PORTION EXTENDING THROUGH SAID FIXED PLATEN SECTION FOR OPERATIVE REGISTRATION WITH A DIE MEMBER MOUNTED ON THE FIXED PLATEN SECTION AND HAVING A NOZZLE VALVE AUTOMATICALLY OPENED WHEN THE PLATENS CLOSE, (B) A RECIPROCABLE CRANKCASE MOUNTED ON THE BARS BETWEEN THE MAGAZINE AND THE PRESSURE PLATE; (C) A PRESSURIZING AND INJECTION PISTON OPERATIVELY POSITIONED IN SAID MAGAZINE; (D) A PISTON RECIPROCATING MEMBER CARRIED BY THE CRANKCASE AND OPERATIVELY CONNECTED TO THE PRESSURIZING AND INJECTION PISTON; (E) AND POWER SPRING MEANS BETWEEN THE RECIPROCABLE CRANKCASE AND THE PRESSURE PLATE STORING PISTON REACTION FORCES PRODUCED BY FILLING AND PRESSURIZING THE MAGAZINE WITH PLASTICIZED MATERIAL, SAID POWER SPRING MEANS AUTOMATICALLY ACTUATING THE CRANKCASE AND THE PISTON TO EFFECT AN INJECTION STROKE UPON OPENING THE NOZZLE VALVE.