| 摘要 |
FIELD: transport engineering; bicycles. ^ SUBSTANCE: invention relates to front speed changer operated by auxiliary cam. Speed change cam 304 can be connected with rotating pedal shaft by means of clutch member 324 by pulling out control cable 460 laid from speed changer handle on handlebar. With cam 304 rotated, tracer in form of lever 312 pulls out drive cable 340 coupled drive lever used to shift guide of chain. At further rotation of cam 304, release member disconnects clutch member 324 of cam from pedal shaft. ^ EFFECT: provision of connection and disconnection of cam from pedal shaft so that rotation of pedal shaft can be used for contributing to speed changing. ^ 37 cl, 23 dwg |
