| 摘要 |
<p>A manually portable chain saw (10) having a gripping handle (18), a cutting chain (26), a sensing arm (30), and a motive force mechanism (14), features a releasable bistate mechanism (39a) for stopping cutting chain movement in response to forward movement of the sensing arm (30). The releasable bistate assembly (39a) captures an end of a brake band (40) for longitudinal movement in the direction of the brake band (40) and transverse movement in the direction of the long axis of the sensing arm (30). Independent adjustment of the forces on the sensing arm (30) and on the latch mechanism (49), and positive braking action are achieved. Separate spring biases (50, 52) are employed against the sensing arm (30) and the latch mechanism (49) respectively. </p> |
