Apparatus for casting centrifugal type pumps

Claim 1

APPARATUS FOR CASTING A CENTRIFUGAL IMPELLER PUMP HOUSING HAVING A GENERALLY ANNULAR MAIN BODY PORTION WITH A FLAT PERIPHERAL FLANGE AT ONE END, A TUBULAR EXTENSION AT THE OPPOSITE END AND A LATERALLY PROJECTING NIPPLE INTERMEDIATE THE ENDS WHICH COMPRISES: A DIE HAVING A CAVITY FOR EXTERNALLY SHAPING SAID HOUSING, A FIRST DIE PIN EXTENDING INTO SAID DIE CAVITY FROM THE FLANGE-FORMING END THEREOF HAVING A TAPERED FACE FOR FORMING A FRUSTO-CONICAL RECESS IN THE FLANGE, A CYLINDRICAL PORTION FOR FORMING A CYLINDRICAL CHAMBER IN THE MAIN BODY EXTENDING FROM THE BOTTOM OF THE FRUSTO-CONICAL RECESS AND A FLAT SHOULDER FOR FORMING AN END WALL FOR SAID CHAMBER, A SECOND DIE PIN PROJECTING INTO THE DIE CAVITY FROM THE NIPPLE FORMING PORTION THEREOF HAVING A MAIN BODY FOR FORMING THE INTERIOR OF THE NIPPLE AND A CURVED LEADING END PROJECTING INTO THE CAVITY AROUND THE CYLINDRICAL PORTION OF THE FIRST PIN TO COACT WITH THE FIRST PIN IN FORMING A TANGENTIAL RECESS FOR DIRECTING LIQUID FROM THE NIPPLE INTO THE CHAMBER WITH A WHIRLING ACTION, AND A THIRD PIN ALIGNED WITH THE FIRST PIN AND PROJECTING FROM THE OPPOSITE END OF THE DIE CAVITY TO COACT WITH THE FIRST PIN FOR DEFINING A REDUCED DIAMETER PASSAGEWAY COMMUNICATING WITH THE CHAMBER IN AXIAL ALIGNMENT THEREWITH.