Carburetor control mechanism

Claim 2

A CONTROL MECHANISM FOR A CARBURETOR INCLUDING A CHOKE VALVE AND A THROTTLE VALVE EACH OPERABLE TO BE MOVED BETWEEN A CLOSED POSITION AND AN OPEN POSITION, SAID CONTROL MECHANISM COMPRISING LINKAGE MEANS CONNECTING SAID THROTTLE VALVE WITH SAID CHOKE VALVE TO RENDER SAID THROTTLE VALVE MOVABLE TOWARD ITS OPEN POSITION IN DEPENDENCE UPON MOVEMENT OF SAID CHOKE VALVE ONLY WHEN SAID CHOKE VALVE MOVES TOWARD ITS CLOSED POSITION, SAID LINKAGE MEANS INCLUDING MEANS FOR CAUSING SAID THROTTLE VALVE TO BE MOVED TOWARD ITS OPEN POSITION AT A RELATIVELY LOWER RATE WHEN SAID CHOKE VALVE IS MOVED TOWARD

Claim 3

A control mechanism according to claim 1 wherein said choke valve is mounted to rotate about a fixed axis and wherein said linkage mechanism includes a first lever connected to move with said choke valve about said fixed axis, a second lever detachably coupled through a third lever to move with said throttle valve, and a connecting rod extending between said first and second levers, said connecting rod having one end pivotally mounted to said first lever at a first joint and a second end pivotably mounted to said second lever at a second joint, said linkage means being configured such that said first joint may be pivotally moved to be located on both sides of a line extending between said pivot axis and said second joint.

Claim 4

A control mechanism according to claim 2 wherein said linkage mechanism is configured such that during operation of said control mechanism said first joint may be at a position which lies upon said line extending between said pivot axis and said second joint.

Claim 5

A control mechanism according to claim 1 wherein as said choke valve moves through a predetermined portion of its movement from its open position to its closed position, said linkage mechanism causes said throttle valve to move in the direction of opening at a continuously decreasing rate of movement.

Claim 6

A control mechanism according to claim 1 wherein said linkage mechanism comprises first linkage means affixed with said choke valve to be movable therewith, second linkage means affixed with said throttle valve to be movable therewith, and abutment means located to enable said first and second linkage means to move towards and into abutment with each other when said choke valve moves toward its closed position and away from abutment with each other when said choke valve moves towards its open position, said first linkage means, said second linkage means and said abutment means being interdependently configured to cause said throttle valve to be driven toward its open position by movement of said choke valve toward its closed position only when said first and second linkAge means are in abutment with each other.

Claim 7

A control mechanism according to claim 5 wherein saaid abutment means are adjustable to vary the point of abutment between said first and second linikage means.

Claim 8

A control mechanism according to claim 6 wherein said abutment means comprise screw means threadedly engaged with one of said first and second linkage means and extending therefrom for abutment with the other of said first and second linkage means.

Claim 9

A control mechanism according to claim 5: wherein said throttle valve is fixedly mounted to a rotatable throttle shaft, and said choke valve is fixedly mounted to a rotatable choke shaft; wherein said first linkage means comprise a first choke-connected lever fixed to said choke shaft, a third choke-connected lever freely rotatably mounted upon said throttle shaft, and a second choke-connected lever pivotally connected to both said first and said third levers and extending therebetween; wherein said second linkage means comprise a throttle-connected lever fixedly mounted to said throttle shaft; and wherein said abutment means comprise means for effecting abutting engagement between said third choke-connected lever and said throttle-connected lever.