| 摘要 |
The internal combustion engine for a lawn mower or the like includes a carburetor, a throttle member or plate disposed in the carburetor throat and movable between an open position and a flow restricting position, a rotatable shaft carrying the throttle plate and connected to a movable air vane, an engine fan, such as a finned flywheel, for blowing air against the air vane and urging the throttle plate toward a flow restricting position, a torsion spring encircling the throttle shaft with a first end connected thereto for biasing the throttle plate toward the open position and adjustment means connected to the spring for adjusting the biasing force of the spring on the throttle plate. The adjustment means includes a speed control member or lever connected to the second end of the spring and mounted remotely from the throttle shaft for reciprocative movement in a direction transversely of the rotational axis of the throttle shaft between first and second spring force level positions. The adjustment means also includes a collar surrounding the throttle shaft and connected to the first end of the spring and interlocking means on the air vane and on the collar for effecting common rotation of the air vane and collar and for releasably permitting rotation of the collar relative to the air vane for adjusting the biasing force of the spring on the throttle plate.
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