| 摘要 |
A throttle actuating mechanism is employed in conjunction with a chain saw which has a trigger and is mounted for pivotal movement about a rotary axis from a rest position toward a workpiece. The mechanism includes a lever pivoted coaxially with the rotary axis of the chain saw and carrying an adjustable pin. The pin is engaged by the chain saw trigger when the chain saw is pivoted toward the workpiece, whereby the lever pivots in a first direction along with the lever. A spring yieldably opposes pivotal movement of the lever in the first direction, thereby causing the pin to actuate the trigger when the chain saw leaves its rest position. The lever engages a stop while pivoting in the opposite direction and before the chain saw reaches its rest position, whereby the trigger is deactivated when the chain saw is in its rest position.
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