| 摘要 |
Improvements in the mounting of the transmission chain of bicycles for guiding and supporting the chain, comprising an arc-shaped guide applied on the inner side of the end of the rear fork of the bicycle, substantially concentric to the axis of the rear wheel of the bicycle itself, and mechanism for controlling the change-speed gear, which comprise a control lever rotatable with high friction into an appropriate seat of a clamp fixed to the front tube of the bicycle frame, to which lever is connected the change-speed gear control cable, a pawl mounted on said lever freely oscillating against the action of a spring, and a fixed stirrup associated with said seat and/or clamp. The pawl is adapted to cooperate with two ratchet gear teeth of the stirrup to permit movement of the chain to either an adjacent sprocket or to the guide.
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