Patent ID: 6202989
Filing Date: 2001-03-20
Classification: F02M

Abstract:
In a control mechanism for a fuel/air mixing apparatus having a throttle valve and a choke valve, said throttle valve having closed low speed idle, fast idle cold start and full speed open positions and said choke valve having cold start closed and full speed open positions, said control mechanism including first biasing means biasing said throttle valve toward its idle position, second biasing means biasing said choke valve toward its full speed position, interengageable automatic mechanical releasable latch means associated with the respective valves for releasably holding both valves in their cold start positions in opposition to the biasing means while allowing movement of said choke valve from its idle position toward its full speed position, said interengageable latch means being released by movement of the throttle valve from its cold start position toward its full speed position, said latch means comprising a choke lever and a fast idle latch lever associated with said choke valve, said choke lever having a formation for engaging a cooperative formation on said fast idle lever when said choke valve is moved from its full speed position toward its cold start position for holding said choke and fast idle lever in interengagement when so moving in opposition to the respective biasing means, and a throttle lever associated with said throttle valve for moving said throttle valve between its low speed idle position and its full speed position and being latch-engageable with said fast idle lever, said latch means comprising a ratchet notch on one of said fast idle and throttle levers and a pawl on the other one of said fast idle and throttle levers for releasably engaging and holding said fast idle and throttle levers in releasable one-way clutch interengagement, the improvement wherein said latch means includes a lost motion coupling between said choke valve and fast idle lever to enable override between said ratchet notch and said pawl after said choke valve reaches fully closed position.