Carburetor throttle and choke control mechanism

In a carburetor throttle and choke control mechanism incorporating a choke-throttle cold-start setting latch mechanism that automatically positions a throttle valve slightly open at a fast idle position when the choke valve is swung from open to fully closed position, and comprising a rotatable choke shaft carrying a choke plate valve, a rotatable throttle shaft carrying a throttle plate valve, a choke lever fixed on said choke shaft for rotating said choke valve from open to closed, a throttle lever fixed on said throttle shaft for rotating said throttle valve from closed to open against the bias of a throttle return spring, and a fast idle latch lever journaled on said choke shaft biased by a fast idle return spring, which in turn biases said choke valve (via said choke lever and choke shaft) from fully open to fully closed and having a free end swingable in a travel path generally co-planar with and intersecting the travel path of a free end of said throttle lever, a releasable latch on said free ends interengageable as a toggle that is held latched by said return springs in the choke-closed position of said choke valve and the fast idle position of said throttle valve, and wherein one of said choke and fast idle levers has a tang operable to push couple via said tang the other one of said choke and throttle levers such that choke closing rotation of said choke lever imparts co-rotation of said fast idle lever toward latched condition, the improvement in combination therewith wherein said push tang is provided on said fast idle lever as a lateral offset from the plane of rotation thereof, and said choke lever has a pusher foot adapted to abut in push relation said tang to produce said co-rotation thereof in response to rotational force imparted to said choke lever in rotating said choke valve from wide open toward closed condition, and wherein said pusher foot of said choke lever comprises a relatively rigid pusher leg portion adapted for abutment in push relation with said fast idle lever tang and an extension of said leg portion in the form of a generally U-shaped resilient spring hook portion adapted to overlap said tang and releasably hook engage the same when said leg portion is brought into full push abutment with said tang, said U-shaped hook portion being resiliently flexible to act as a spring to develop a torque on said choke by pulling said choke valve fully closed when said fast idle lever is moved to fully latched condition while flexing so that said gap remains between said pusher leg portion and said tang.

In a carburetor throttle and choke control mechanism incorporating a choke-throttle cold-start setting latch mechanism that automatically positions a throttle valve slightly open at a fast idle position when the choke valve is swung from open to fully closed position, and comprising a rotatable choke shaft carrying a choke plate valve, a rotatable throttle shaft carrying a throttle plate valve, a choke lever fixed on said choke shaft for rotating said choke valve from open to closed, a throttle lever fixed on said throttle shaft for rotating said throttle valve from closed to open against the bias of a throttle return spring, and a fast idle latch lever journalled on said choke shaft biased by a fast idle return spring, which in turn biases said choke valve (via said choke lever and choke shaft) from fully open to fully closed and having a free end swingable in a travel path generally co-planar with and intersecting the travel path of a free end of said throttle lever, a releasable latch on said free ends interengageable as a toggle that is held latched by said return springs in the choke-closed position of said choke valve and the fast idle position of said throttle valve, and wherein one of said choke and fast idle levers has a tang operable to push couple via said tang the other one of said choke and throttle levers such that choke closing rotation of said choke lever imparts co-rotation of said fast idle lever toward latched condition, the improvement in combination therewith wherein said releasable latch is constructed and arranged such that during said interengagement aiding torque is created to thereby angularly phase shift said fast idle lever relative to said choke lever and thereby open a gap in said push coupling and thereafter maintain such a push de-coupling gap that remains in the latched position of said valves.