Patent ID: 9266581
Filing Date: 2016-02-23
CPC Classification: B62K,B62M,Y10T

Claim Text:
1. An actuation device for a control cable for a bicycle gearshift, comprising: a casing, configured for attachment on an end of a handlebar of the bicycle, a bobbin on which to wind the cable, angularly mobile in the casing around a main axis of the device, a drive mechanism, acting on the bobbin to rotate the bobbin in a first and in a second angular direction around the main axis of the device, indexing means to removably hold the bobbin in predetermined angular positions, the drive mechanism comprising: a lever that is biased towards a neutral position, angularly mobile with respect to the casing around the main axis of the device, in the first or in the second angular direction from the neutral position to obtain downward or upward gearshifting, an internally toothed crown, non-rotatably mounted to the bobbin and angularly mobile in the casing, elastic means acting between the lever and the casing that bias the lever into the neutral position, and a ratchet mechanism between the lever and the toothed crown that comprises: two opposite rocker arms, hinged on the lever according to two pivot axes parallel to one another and to the main axis of the device, each of said rocker arms having an arched shape wrapping around the main axis of the device and extending from a first end to a second end, wherein the first end of the first rocker arm is proximal to the first end of the second rocker arm and the second end of the first rocker arm faces towards the second end of the second rocker arm, a toothed sector, formed on each rocker arm on an outer side thereof, proximal to the respective second end, said sector having a toothing profile for engaging the toothing of the toothed crown, wherein the crown is in an axial position corresponding to that of the toothed sectors along the main axis of the device, a cam profile, formed on each rocker arm on an inner side thereof, adjacent to the respective first end, a thruster to thrust each rocker arm around a pivot axis of the rocker arm to thrust the second end of each of the rocker arms away from the main axis of the device, a pointer that is stationary with respect to the casing and facing radially outwards with respect to the main axis of the device, engaged with at least one cam profile on the rocker arms, each cam profile is configured such that: when the pointer is engaged with the cam profile of one of the rocker arms, the toothed sector of the one rocker arm is positioned away from the toothed crown, and when the pointer is disengaged from the cam profile, the toothed sector of the one rocker arm is thrust into engagement with the toothed crown by the thruster.