| 摘要 |
A chainsaw is provided having a brake band disposed about a brake drum, which is rotated upon movement of a throttle control trigger to an on throttle position. Rotation of the brake drum results in rotation of the saw chain about the saw bar. A braking mechanism, in its normal position, serves to draw the brake band taut about the brake drum to prevent advancement of the saw chain. A safety lever is associated with the braking mechanism, and, in its braking position does not affect the normal position of the braking mechanism. When the safety lever is moved to its release position, the braking mechanism is manipulated and the brake band is loosened from about the brake drum. When loosened, moving the throttle control trigger to the on throttle position causes the brake drum rotate to drive the elements of the chainsaw that serve to advance the saw chain.
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