Return flow carburetor

Claim 2

IN A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE HAVING AN INTAKE MANIFOLD SYSTEM, A THROTTLE VALVE IN SAID SYSTEM, A FUEL BOWL, A MOVABLE-WALL TYPE FUEL PUMPING MEANS, INLET CONDUIT MEANS CONNECTING SAID PUMPING MEANS AND BOWL FOR SUPPLYING THE LATTER WITH FUEL UPON OPERATION OF SAID PUMPING MEANS, MEANS FOR MAINTAINING THE FUEL IN SAID BOWL AT A PREDETERMINED LEVEL COMPRISING AN OVERFLOW WEIR IN SAID BOWL DEFINING AT LEAST IN PART A CHAMBER ADAPTED TO RECEIVE EXCESS FUEL OVERFLOWING SAID WIER FROM SAID BOWL WHEN THE FUEL IN SAID BOWL ATTAINS SAID PREDETERMINED LEVEL, FUEL RETURNS MEANS IN COMMUNIATION WITH SAID CHAMBER TO DRAIN FUEL THEREFROM UPON OVERFLOW OF EXCESS FUEL FROM SAIDBOWL INTO SAID CHAMBER SAID PUMPING MEANS HAVING A RECIPROCABLE WALL MOVABLE IN ALTERNATE INTAKE AND PUMPING STROKES, A CYCLICAL CAM, FOLLOWER MEANS ENGAGEABLE WITH SAID CAM AND WALL TO EFFECT RECIPROCATION OF THE LATTER, AND MEANS OPERATIVELY CONNECTED WITH SAID THROTTLE VALVE FOR ADJUSTABLY CONTROLLING THE RELATIVE POSITIONS OF SAID FOLLOWER MEANS WITH RESPECT TO SAID CAM TO INCREASE THE LENGTH OF SAID PUMPING STROKE UPON OPENING OF SAID VALVE.

Claim 3

IN A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE HAVING AN INTAKE MANIFOLD SYSTEM, A THROTTLE VALVE IN SAID SYSTEM, INLET CONDUIT MEANS CONNECTING SAID PUMPING MEANS, INLET CONDUIT MEANS CONNECTING SAID PUMPING MEANS AND BOWL FOR SUPPLYING THE LATTER WITH FUEL UPON OPERATION OF SAID PUMPING MEANS, FUEL DUCT MEANS CONNECTING SAID BOWL AND INTAKE MANIFOLD SYSTEM FOR SUPPLYING FUEL TO THE LATTER, MEANS FOR MAINTAINING THE FUEL IN SAID BOWL AT A PREDETERMINED LEVEL COMPRISING AN OVERFLOW WEIR IN SAID BOWL DEFINING AT LEAST IN PART A CHAMBER ADAPTED TO RECEIVE EXCESS FUEL OVERFLOWING SAID WEIR FROM SAID BOWL WHEN THE FUEL IN SAID BOWL ATTAINS SAID PREDETERMINED LEVEL, FUEL RETURN MEANS IN COMMUNICATION WITH SAID CHAMBER TO DRAIN FUEL THEREFROM UPON OVERFLOW OF EXCESS FUEL FROM SAID BOWL INTO SAID CHAMBER, SAID PUMPING MEANSHAVING A RECIPROCABLE WALL MOVABLE IN ALTERNATE INTAKE AND PUMPING STROKES, PRESSURE EXERTING MEANS FOR YIELDINGLY URGING SAID WALL IN A PUMPING STROKEK RECIPROCABLE ACTUATING MEANS OPERATIVELY CONNECTED WITH SAID WALL FOR MOVING THE LATTER IN OPPOSITION TO SAID PRESSURE EXERTING MEANS TO EFFECT AN INTAKE STROKE OF SAID WALL UPON MOVEMENT OF SAID ACTUATING MEANS IN ONE DIRECTION AND FOR RELEASING SAID WALL FOR MOVEMENT IN SAID PUMPING STROKE UPON MOVEMENT OF SAID ACTUATING MEANS IN THE OPPOSITE DIRECTION, AND MEANS OPERATIVELY CONNECTED WITH SAID THROTTLE VALVE FOR ADJUSTABLY CONTROLLING THE MOVEMENT OF SAID ACTUATING MEANS IN OPPOSITION TO SAID PRESSURE EXERTING MEANS FOR INCREASING SAID PUMPING STROKE IN ACCORDANCE WITH OPENING OF SAID VALVE.

Claim 4

IN A CARBURETOR FOR AN INTERNAL COMBUSTION ENGINE HAVING AN INTAKE MANIFOLD SYSTEM, A THROTTLE VALVE IN SAID SYSTEM, INLET CONDUIT MEANS CONNECTING SAID PUMPING MEANS, INLET CONDUIT MEANS CONNECTING SAID PUMPING MEANS AND BOWL FOR SUPPLYING THE LATTER WITH FUEL UPON OPERATION OF SAID PUMPING MEANS, FUEL DUCT MEANS CONNECTING SAID BOWL AND INTAKE MANIFOLD SYSTEM FOR SUPPLYING FUEL TO THE LATTER, MEANS FOR MAINTAINING THE FUEL IN SAID BOWL AT A PREDETERMINED LEVEL COMPRISING AN OVERFLOW WEIR IN SAID BOWL DEFINING AT LEAST IN PART A CHAMBER ADAPTED TO RECEIVE EXCESS FUEL OVERFLOWING SAID WEIR FROM SAID BOWL WHEN THE FUEL IN SAID BOWL ATTAINS SAID PREDETERMINED LEVEL, FUEL RETURN MEANS IN COMMUNICATION WITH SAID CHAMBER TO DRAIN FUEL THEREFROM UPON OVERFLOW OF EXCESS FUEL FROM SAID BOWL INTO SAID CHAMBER, SAID PUMPING MEANSHAVING A RECIPROCABLE WALL MOVABLE IN ALTERNATE INTAKE AND PUMPING STROKES, PRESSURE EXERTING MEANS FOR YIELDINGLY URGING SAID WALL IN A PUMPING STROKEK RECIPROCABLE ACTUATING MEANS OPERATIVELY CONNECTED WITH SAID WALL FOR MOVING THE LATTER IN OPPOSITION TO SAID PRESSURE EXERTING MEANS TO EFFECT AN INTAKE STROKE OF SAID WALL UPON MOVEMENT OF SAID ACTUATING MEANS IN ONE DIRECTION AND FOR RELEASING SAID WALL FOR MOVEMENT IN SAID PUMPING STROKE UPON MOVEMENT OF SAID ACTUATING MEANS IN THE OPPOSITE DIRECTION, AND MEANS OPERATIVELY CONNECTED WITH SAID THROTTLE VALVE FOR ADJUSTABLY CONTROLLING THE MOVEMENT OF SAID ACTUATING MEANS IN OPPOSITION TO SAID PRESSURE EXERTING MEANS FOR INCREASING SAID PUMPING STROKE IN ACCORDANCE WITH OPENING OF SAID VALVE.