| 摘要 |
A gear selection device, especially for a bicycle including a train of driving plates, a train of driven pinions connected by a chain, a gearshift associated with the plates and a gearshift associated with the pinions, a first cable for controlling the gearshift associated with the plates and a second cable for controlling the gearshift associated with the pinions, the gearshifts moving between two extreme positions and including elastic recall for moving from one of the extreme positions to the other, wherein the gear selection device includes a single rotary control handle with a fixed portion forming a pan for linking with the cycle and equipped with a barrel integral with the handle and including two tracks for receiving pins fixed to the ends of the first and second control cables, the tracks having profiles to ensure a positioning with a sufficient tolerance to exaggerate the movement and accurate return of the cables corresponding to the plate/pinion pairings of the selected successive gears, as well as an indexing mechanism for each of these gears, as well as a gear selection method.
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