Patent ID: 7246650

Claim:
An apparatus for enhanced gravity casting comprising: a housing; a molten lead holding chamber in said housing; an inlet passage in said housing, said inlet passage located in fluid communication with said chamber in said housing; a mold part, said mold part having a battery part cavity therein, said mold part having an opening for ingress of a molten lead therein; a movable mold part, said moveable mold part having an end face and a sidewall, said sidewall engageable with the inlet passage to capture molten lead in the cavity and prevent flow of molten lead to or from the cavity, said movable mold part end face maintainable in contact with a portion of the molten lead in the cavity under a following force to cause the movable mold part end face to move toward the cavity to reduce a mold cavity volume in response to the molten lead solidification contraction wherein the movable mold part has a first diameter and the inlet has a second diameter with a diametrical difference between the first diameter and the second diameter of about 0.005 inches to allow air to flow out while preventing lead from flowing therepast.