Patent ID: 7507365

Claim:
A pump for pumping molten metal, comprising: a base including a first impeller chamber and a second impeller chamber, a base inlet opening in fluid communication with at least one of said first impeller chamber and said second impeller chamber, and a first base outlet opening extending from said first impeller chamber and a second base outlet opening extending from said second impeller chamber; a pump shaft; a motor adapted to rotate said shaft; an impeller fastened to said shaft and adapted to be rotated in said first impeller chamber and said second impeller chamber, said impeller including end portions spaced apart from each other along a rotational axis of said impeller, an impeller inlet opening disposed near one of said end portions and impeller outlet openings disposed near a side of said impeller, said impeller inlet opening being in fluid communication with said impeller outlet openings; and impeller positioning means for moving said impeller in said base effective to place said impeller outlet openings so as to selectively release molten metal into said first base outlet opening or said second base outlet opening.