Metering apparatus for an injection molding machine

Claim 1

IN A MOLDING MACHINE FOR THE HIGH PRESSURE CASTING OF THERMOPLASTIC MATERIALS, SAID MACHINE HAVING A METERING APPARATUS ARRANGED TO SELECTIVELY METER A PREDETERMINED AMOUNT OF MOLDING MATERIAL, TRANSFER MEANS INCLUDING AN OUTLET CHAMBER THEREFOR, SAID CHAMBER BEING IN COMMUNICATING RELATIONSHIP WITH SAID METERING CHAMBER, AN IMPACT MEANS INCLUDING A CHAMBER IN COMMUNICATION WITH SAID TRANSFER CHAMBER, AND A DIE CAVITY HAVING ONE PORTION FORMED BY A MOVABLE CORE AND ANOTHER PORTION FORMED BY SAID IMPACT MEANS, SAID DIE CAVITY BEING IN FLUID COMMUNICATION WITH SAID IMPACT CHAMBER, SAID METERING APARATUS COMPRISING: A YIELDABLE FIRST PISTON SLIDABLE IN A METERING CHAMBER AND DISPLACEABLE BY MOLDING MATERIAL FED INTO SAID METERING CAVITY; AND A SECOND PISTON FORMING A PORTION OF SAID TRANSFER MEANS MOVABLE AT RIGHT ANGLES TO SAID FIRST PISTON IN SAID METERING CHAMBER, AND MOVABLE IN AN APERTURE FORMED IN SAID YIELDABLE FIRST PISTON AND SAID TRANSFER MEANS TO DISPLACE ALL OF THE MOLDING MATERIAL REMAINING IN SAID METERING CHAMBER AFTER EVACUATION OF THE MAJOR PORTION OF SAID METERING CHAMBER BY A MOVEMENT OF SAID YIELDABLE FIRST PISTON TOWARDS SAID TRANSFER MEANS.