Patent ID: 6978976

Claim:
A combination for use in a wax pattern molding process comprising: a mold having a cavity formed therein, the mold having a spring-loaded lock, said spring-loaded lock having a retractable pin; and a core removably inserted into the cavity of the mold, the core including: a center core piece including a base and a plurality of side walls, the base having a passage formed therein, the passage extending from the base to one of the side walls of the center core piece; a plurality of outer core pieces, each outer core piece being removably coupled to a respective side wall of the center core piece and having a chamber formed therein; and a manifold coupled to the base of the center core piece, the manifold having an opening in flow communication with the passage of the center core piece, and a groove formed therein, the groove being in flow communication with the chambers of the outer core pieces and a vent hole, the manifold having an aperture formed in a side thereof; wherein the retractable pin extends into the aperture to secure the core in the mold.