| 摘要 |
The invention relates to an actuation device (10) for a control cable for a bicycle gearshift, comprising:
- a casing (14), configured for fixing to bicycle handlebars,
- a cable-winding bush (22), on which the control cable is wound and which is angularly mobile in the casing (14) about a main axis (A) of the device (10),
- an indexing bush (26) coaxial to the cable-winding bush (22) and associated with it to removably hold the cable-winding bush (22) in predetermined angular positions, angularly spaced apart each other by predetermined indexing angles (±),
- a manoeuvring mechanism (30), operative on the cable-winding bush (22) to rotate it in a first angular direction (R) about the main axis (A) of the device (10), to obtain an upward gearshifting. Between the cable-winding bush (22) and the indexing bush (26) it is provided a coupling (40) with a predetermined circumferential clearance (42) corresponding to a predetermined gearshifting extra-stroke angle (²). |
