Automatic return structure for chain detachment of bicycle
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United States of America Patent
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Sep 22, 2020
Grant Date -
N/A
app pub date -
Jun 19, 2018
filing date -
Jun 19, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
In an automatic return structure of a bicycle, a stopper block is mainly disposed on the other end of a crank different from a pedal, and a guide block is disposed on an inner surface of a middle portion of the crank. The stopper block may be formed with a groove on the other end of the crank. The guide block has an arced guide surface. Upon chain detachment, the stopper block blocks the chain, and then the pedal being pedaled makes the guide block lift up the chain to a location above the sprocket, so that the chain slides downward to teeth of the sprocket along the arced guide surface to perform automatic upshifting. The danger of chasing caused by the sudden slowdown or stop upon chain detachment can be avoided, the rider needs not to get off to perform manual upshifting, and riding convenience can be significantly enhanced.
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