| 摘要 |
A canceling ratchet consists of ratchet body portion 31, ratchet movable portion 32 enabled to move in a forward and backward direction in ratchet body portion 31, and a movable portion pushing spring 40 provided between these portions. When a grabby brake phenomenon occurs in turn lever 24, ratchet movable portion 32 moves in direction of arrow G1 against a spring force of movable portion pushing spring 40. When a cancel operation is performed, the direction of vector F1 differs by nearly 90 degrees from the direction of movement of ratchet movable portion 32, and from the direction of expansion and contraction of movable portion pushing spring 40. Thus, the magnitude of a vector F4 representing a force acting on movable portion spring 40 is relatively small, exerting a small influence on the movable portion pushing spring.
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