Patent ID: 7461573

Claim:
Actuation device for a control cable for a bicycle gearshift, comprising: a casing, attachable to a bicycle handlebar, a cable-winding bobbin, angularly mobile in the casing about a main axis of the device, a first driving mechanism, acting on the bobbin to rotate the bobbin in a first angular direction, a second driving mechanism, acting on the bobbin to rotate the bobbin in a second angular direction opposite the first, an indexer assembly to removably hold the bobbin in predetermined angular positions, the indexer assembly comprises: first countering means, to counter the rotation of the bobbin in the first direction, second countering means, distinct from the first countering means, to counter the rotation of the bobbin in the second direction, and at least one ball engaged both with a stationary member integral with the casing and with a rotating member integral in rotation with the bobbin; the first countering means comprise a first countering spring that acts on the ball to keep the ball in a stop position wherein the ball makes the stationary member and the rotating member integral in rotation; the second countering means comprise a second countering spring that acts upon the ball to keep the ball in the stop position.