Die casting apparatus

Claim 1

IN DIE-CASTING APPARATUS IN WHICH MOLTEN METAL IS INJECTED FROM A CYLINDER THROUGH A NOZZLE AND A SPRUE HOLE INTO A CAVITY FORMED BY FIXED AND MOVABLE DIE PARTS WHEN CLOSED TO CAST ARTICLES BY OPERATION OF A PLUNGER MOVABLE BETWEEN UPPER AND LOWER LIMITS IN A CYLINDER SUBMERGED IN A POT OF MOLTEN CASTING METAL, AND RECEIVING MOLTEN METAL FROM THE POT THROUGH A FILL-PORT IN ITS WALL, THE IMPROVEMENT COMPRISING: MEANS FOR CASING CLOSING AND OPENING MOVEMENTS TO BE IMPARTED TO THE MOVABLE DIE PART; MEANS TO CAUSE THE PLUNGER, AFTER THE DIES ARE CLOSED, TO INJECT MOLTEN METAL THROUGH THE GOOSENECK, NOZZLE AND SPRUE HOLE INTO THE DIE CAVITY AND SUBSEQUENTLY WHILE THE DIES REMAIN CLOSED CAUSE THE CONTINUOUS RETURN OF THE PLUNGER TO THE UPPER LIMIT OF ITS MOVEMENT TO WITHDRAW MOLTEN METAL FROM THE SPRUE, NOZZLE AND ADJACENT PART OF THE GOOSENECK; AND MEANS RESPONSIVE SOLELY TO THE CLOSING AND OPENING MOVEMENTS OF THE MOVABLE DIE PART FOR RESPECTIVELY CLOSING AND OPENING SAID FILL-PORT WHILE THE PLUNGER IS AT THE UPPER LIMIT OF ITS MOVEMENT.