Patent ID: 6701998
Filing Date: 2004-03-09
Classification: B22D,H01M

Abstract:
An apparatus for die cast battery part when the molten lead is in either the liquid, solid or mush state to form a finished battery part:a mold having a set of faces for defining a portion of an outer surface of a battery part cavity; a pin having a face thereon, said pin extending through the battery part cavity to form an inner face of a battery part cavity; an inlet for delivering lead in a molten state into the battery part cavity; a heater for maintaining the lead in a molten state when the lead in a molten state is not being delivered into the battery part cavity; a retractable piston, said retractable piston having a battery part face thereon for forming the battery part cavity into a closed volume, said battery part face extending in a side-to-side condition to adjoin the set of faces in the battery part cavity, said retractable piston positionable in a first condition to allow the lead in a molten state to flow into the battery part cavity, said retractable piston driveable toward the battery part cavity to close the volume of the battery part cavity to thereby shut off the flow of the lead in a molten state into the battery part cavity and to decrease the closed volume of the battery part cavity by bringing the battery part face toward the battery part cavity to shrink the volume of the battery part cavity without disrupting a faces on a solidifying battery part solidifying therein to produce the battery part with an exterior finished surface.