Method of and means for producing dense articles from molten materials

Claim 1

IN A VACUUM DIE CASTING MACHINE, COMPRISING A PAIR OF MOLD SECTIONS WITH ADJACENT FACING SURFACES, EACH OF SAID SURFACES HAVING A RECESS FORMED THEREIN, COOPERATINH TO FORM A MOLD CAVITY DISPOSED ON A PLANE EXTENDING PARALLEL TO SAID SURFACES, SAID SURFACES EACH HAVING AN ARCUATE RECESS FORMED THEREIN AND EXTENDING AROUND SAID DIE CAVITY AND COOPERATING TO FORM A CONDUIT, SAID SURFACES EACH HAVING HALF OF A CYLINDER, SAID CONDDIT OPENING COOPERATING TO FORM A FULL CYLINDER, SAID CONDUIT OPENING INTO SAID CYLINDER, A PISTON DISPOSED IN SAID CYLINDER AND MOVABLE TO AN INWARD POSITION TO CLOSE SAID CONDUIT, A VACUUM SOURCE IN COMMUNICATION WITH SAID CONDUIT AND SAID CONDUIT BEING IN COMMUNICATION WITH SAID MOLD CAVITY WHEN SAID PISTON IS IN A RETRACTED POSTION EXPOSING SAID CONDUIT OPENING TO SAID CYLINDER, A HYDRAULLIC POWER MEANS CONNECTED TO SAID PISTON FOR SELECTIVELY MOVING SAID PISTONS BETWEEN SAID MOLD SECTIONS HAVING AN RETRACTED POSITION, ONE OF SAID MOLD SECTIONS HAVING AN ENLARGE OPENING FORMED THERETHROUGH IN DIRECT ALIGNMENT WITH SAID MOLD CAVITY, A SHOT CYLINDER IN COMMUNICATION WITH SAID ENLARGED OPENING AND DISPOSED AT 90 DEGREES TO SAID FIRST MENTIONED CYLINDER, A RAM PISTON IN SAID SHOT CYLINDER, POWER MEANS FOR RECIPROCATING SAID RAM PISTON TO A POSITION CLOSELY ADJACENT SAID MOLD CAVITY TO A POSITION REMOTE THEREFROM, A CONDUIT IN COMMUNICATION AT ONE END WITH THE INTERIOR OF SAID SHOT CYLINDER, A CONTAINER HAVING MOLTEN MATERIAL AND THE OTHER END OF SAID LAST MENTIONED CONDUIT IN COMMUNICATION WITH SAID MOLTEN MATERIAL.