Patent ID: 6405786
Filing Date: 2002-06-18
Classification: B22D

Abstract:
A system for molding lead articles under pressure comprising:a source of pressurizeable molten lead; a movable mold having a mold cavity therein, said mold maintainable at sufficiently low temperature so that a charge of molten lead located in said mold cavity solidifies to thereby from a solidified casting in said mold cavity; a housing having a runner, said runner connecting said mold cavity to said source of pressurizeable molten lead, said runner maintainable at sufficiently high temperature to maintain said molten lead in a molten state so that the mold cavity can be refilled with a fresh charge of molten lead when a solidified casting is removed therefrom; and a shut-off valve located in said housing, said housing and said shutoff valve maintained at a temperature above a molten lead temperature to prevent solidification of the molten lead in the runner, said shut-off valve having an open position for allowing the charge of molten lead to flow through said runner into said mold cavity and a closed position to prevent molten lead from flowing out of said mold and said runner as the molten lead in said mold cavity solidifies wherein a connecting member of said mold is in intermittent engagement with a connecting member of said housing to thereby minimize a conduction of heat from the housing to said mold so that the charge of molten lead in said cavity can quickly solidify.