Temperature responsive accelerating pump for an internal combustion engine carburetor

Claim 2

AN ACCELERATOR PUMP FUEL SUPPLY SYSTEM FOR AN INTERNAL COMBUSTION ENGINE CARBURETOR, SAID CARBURETOR INCLUDING A SOURCE OF INTAKE MANIFOLD VACUUM, AN INDUCTION PASSAGE, A THROTTLE LEVER AND AN ACCELERATING PUMP, SAID ACCELERATING PUMP INCLUDING A MOVABLE ELEMENT DISPLACEABLE TO DISCHARGE FUEL FROM SAID PUMP INTO SAID INDUCTION PASSAGE, THE QUANTITY OF DISCHARGE FROM SAID PUMP BEING VARIABLE IN DIRECT RELATION TO THE MAGNITUDE OF DISPLACEMENT OF SAID MOVABLE ELEMENT, A SECOND LEVER MOVABLE ABOUT A PIVOT AXIS TO DISPLACE THE MOVABLE ELEMENT OF SAID ACCELERATOR PUMP, LINKAGE MEANS INTERCONNECTING SAID SECOND LEVER AND SAID THROTTLE LEVER, A VACUUM MOTOR INCLUDING A MOVABLE MEMBER CONNECTED TO THE MOVABLE ELEMENT OF SAID ACCELERATOR PUMP, A VACUUM PASSAGE COMMUNICATING SAID VACUUM MOTOR AND A SOURCE OF INTAKE MANIFOLD VACUUM, SAID MOVABLE MEMBER BEING DISPLACEABLE IN RESPONSE TO CHANGES IN INTAKE MANIFOLD VACUUM, MEANS TRANSFERRING DISPLACEMENT OF SAID MOVABLE MEMBER TO SAID MOVABLE ELEMENT, A TEMPERATURE RESPONSIVE VALVE IN SAID VACUUM PASSAGE TO OPEN AND CLOSE SAID VACUUM PASSAGE IN RESPONSE TO CHANGES IN TEMPERATURE, A FULL STROKE OF SAID VACUUM MOTOR DISPLACING THE MOVABLE ELEMENT OF SAID ACCELERATING PUMP A PREDETERMINED DISTANCE, A FULL STROKE OF SAID SECOND LEVER DISPLACING THE MOVABLE ELEMENT OF SAID ACCELERATING PUMP A DISTANCE LESS THAN SAID PREDETERMINED DISTANCE.

Claim 3

A fuel supply system according to claim 1, said temperature responsive valve being open below a predetermined temperature and closed above the predetermined temperature.

Claim 4

A fuel supply system according to claim 1, abutment means limiting the stroke of said second lever.

Claim 5

An accelerating pump fuel supply system for the carburetor of an internal combustion engine, said carburetor including a source of intake manifold vacuum, an induction passage, a throttle lever and an accelerating pump, said accelerating pump including a first flexible diaphragm member, said diaphragm element forming a wall of a variable volume pump chamber, displacement of said diaphragm member causing a discharge from said pump chamber into said induction passage, the quantity of discharge from said pump chamber being variable in relation to the magnitude of displacement of said diaphragm member, a vacuum motor having a second flexible diaphragm member forming a wall of variable volume vacuum chamber, a rod member attached to both said diaphragm members transmitting the displacement of one to the other, a vacuum passage communicating said vacuum chamber and a source of intake manifold vacuum, said second diaphragm member being displaceable in response to changes in intake manifold vacuum, a temperature sensitive valve in said vacuum passage to open and close said passage in response to changes in temperature, a second lever engageable with said rod member for displacement thereof, linkage means interconnecting said second lever and said throttle lever, displacement of said throttle lever causing a corresponding displacement of said rod member, a full stroke of said vacuum motor displacing the rod member and said accelerating pump diaphragm a predetermined distance, a full stroke of said second lever displacing the movable element of said accelerating pump a distance less than said predetermined distance.

Claim 6

An accelerating pump fuel supply system for the carburetor of an internal combustion engine, said carburetor including a source of intake manifold vacuum, an induction passage, a throttle lever and an accelerating pump, said accelerating pump including a first flexible diaphragm member, said diaphragm element forming a wall of a variable volume pump chamber, displacement of said diaphragm member causing a discharge from said pump chamber into said induction passage, the quantity of discharge from said pump chamber being variable in relation to the magnitude of displacement of said diaphragm member, a vacuum motor having a second flexible diaphragm member forming a wall of variable volume vacuum chamber, a rod member attached to both said diaphragm members transmitting the displacement of one to the other, a vacuum passage communicating said vacuum chamber and a source of intake manifold vacuum, said second diaphragm member being displaceable in response to changes in intake manifold vacuum, a temperature sensitive valve in said vacuum passage to open and close said passage in response to changes in temperature, a second lever engageable with said rod member for displacement thereof, linkage means interconnecting said second lever and said throttle lever, displacement of said throttle lever causing a corresponding displacement of said rod member, a full stroke of said vacuum motor displacing the rod member and said accelerating pump diaphragm a predetermined distance, a full stroke of said second lever displacing the movable element of said accelerating pump a distance less than said predetermined distance.

Claim 7

A fuel supply system according to claim 4, said temperature responsive valve being open below a predetermined temperature and closed above the predetermined temperature.

Claim 8

A fuel supply system according to claim 4, a housing enclosing said flexible diaphragm members and said rod member, slot means formed in said rod member and said housing receiving said second lever.

Claim 9

A fuel supply system according to claim 4, abutment means limiting the stroke of said second member.

Claim 10

A fuel supply system according to claim 4, check valve means positioned in said vacuum passage opening toward said vacuum chamber.

Claim 11

A fuel supply system according to claim 4, spring means urging said rod member and said diaphragm members toward a maximum volume vacuum chamber position and a miniMum volume pump chamber position.