Molten metal pump

Claim 1

A PUMP ADAPTED TO BE IMMERSED IN A BATH OF MOLTEN MATERIAL FOR PUMPING THE MATERIAL FROM THE BATH TO A REMOTE DELIVERY POINT COMPRISING A PUMP BODY, MEANS FOR SUPPORTING THE PUMP BODY IN FIXED POSITION WITH AN END PORTION THEREOF SUBMERGED IN A BATH OF MOLTEN MATERIAL, A CUP MEMBER TELESCOPICALLY ARRANGED WITH SAID END PORTION FOF THE PUMP BODY AND ADAPTED TO FORM A PUMP CHAMBER THEREWITH, MEANS FOR RECIPROCATING SAID CUP MEMBER AXIALLY TO INCREASE THE EFFECTIVE SIZE OF SAID PUMP CHAMBER WHEN THE CUP MEMBER IS SHIFTED AXIALLY IN ONE DIRECTION AND TO DECREASE THE EFFECTIVE SIZE OF THE PUMP CHAMBER WHEN THE CUP MEMBER IS SHIFTED AXIALLY IN THE OPPOSITE DIRECTION, AN INLET PASSAGEWAY EXTENDING TO SAID PUMP CHAMBER FROM EXTERIORLY OF THE CUP MEMBER, VALVE MEANS CONTROLLING SAID INLET PASSAGEWAY AND RESPONSIVE TO TRAVEL OF THE CUP IN SAID ONE DIRECTION TO ADMIT MATERIAL FROM THE BATH IN WHICH THE PUMP IS IMMERSED TO SAID PUMP CHAMBER AND TO PREVENT DISCHARGE OF MATERIAL FROM SAID PUMP CHAMBER THROUGH SAID INLET PASSAGEWAY WHEN THE CUP MEMBER IS MOVED IN THE OPPOSITE DIRECTION, A DISCHARGE PASSAGEWAY IN SAID PUMP BODY COMMUNICATING AT ONE END WITH SAID PUMP CHAMBER, A DISCHARGE VALVE CONTROLLING SAID DISCHARGE PASSAGEWAY AND MEANS MECHANICALLY INTERCONNECTING SAID DISCHARGE VALVE WITH SAID CUP MEMBER SO THAT THE DISCHARGE VALVE IS ACTUATED BY SAID CUP MEMBER TO A POSITION CLOSING SAID DISCHARGE PASSAGEWAY WHEN THE CUP MEMBER IS SHIFED AXIALLY TO THE END OF ITS STROKE IN SAID ONE DIRECTION, SAID INTERCONNECTING MEANS PERMITTING THE DISCHARGE VALVE TO SHIFT TO A POSITON OPENING SAID DISCHARGE PASSAGEWAY WHEN THE CUP MEMBER IS SHIFTED IN SAID OPPOSITE POSITION.