FIELD: transport engineering; bicycles.
SUBSTANCE: invention relates to device for automatic speed changing of bicycle depending on tension of chain. One end of lever 6 is hinge-connected with bicycle frame and is provided with lock 8. Other free end of lever 6 is pressed to chain 11 by spring 10. Tension of chain 11 is changed at change of speed of rotation of pedals which provides lifting or lowering of lever 6 and also tie-rod 5 coupled with cable 3 of standard derailleur gear. With intermediate gear engaged, lock 8 provides position of lever corresponding to definite driven sprocket 2.
EFFECT: simplified automatic derailleur gear.
1 dwg
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