Patent ID: 6230786
Filing Date: 2001-05-15
Classification: B22D

Abstract:
An automatic molten metal supply and injection device comprising:a body having a molten metal passage for guiding molten metal;a sleeve having a suction port and a discharge port, said sleeve being mounted rotatably relative to said body between a communication position in which said suction port of said sleeve communicates with said molten metal passage of said body, and a closed position in which communication between said suction port of said sleeve and said molten metal passage of said body is blocked;a first piston axially movably mounted in said sleeve for sucking molten metal into said sleeve through said suction port, and for extruding molten metal from within said sleeve through said discharge port of said sleeve; anda second piston, axially movably mounted in said first piston for movement relative thereto and relative to said discharge port, for movement in an extending direction through said discharge port for closing said discharge port and for pressurizing the molten metal through said discharge port, and for movement in a retracting direction;wherein said first and second pistons are movable independently of each other.