| 摘要 |
A bicycle speed control apparatus according to this invention comprises a take-up element (2) for winding up a speed control cable, the take-up element (2) being urged in a cable unwinding direction, a wind-up control member (4) for rotating the take-up element (2) in a cable winding direction, a position maintaining mechanism (P) including a first engaging member (32) and a first engaging portion (31) engageable stepwise for maintaining the take-up element (2) in a selected position, a rotation limiting mechanism (L) including a second engaging member (62) and a second engaging portion (61) engageable stepwise for limiting rotation in the unwinding direction of the take-up element (2) to a predetermined amount, and an unwind control member (7) operable to effect a change speed by actuating the rotation limiting mechanism (L) and releasing the take-up element (2) from the position maintaining mechanism (P) for unwinding the cable. The first engaging member (32) of the position maintaining mechanism (P) and the second engaging member (62) of the rotation limiting mechanism (L) are movable independently of each other. The apparatus thereby achieves improved durability and relaxation of the requirement for manufacturing dimensional precision. |
