Provided is a chain-drive mechanism for bicycles having a simple overall configuration and keeping the manufacturing cost down, and capable of transmitting a driving force to a rear wheel when the crank arms rotate forward as well as reversely. The chain-drive mechanism for bicycle includes: an inner sprocket 20 configured to integrally rotate with a crankshaft 12 of a bicycle; and an outer sprocket 24 disposed coaxially and in parallel with the inner sprocket 20 to be rotatable relative to the crankshaft 12. An inner freewheel 22 coaxially rotates with the rear wheel of the bicycle, and an outer freewheel 26 is placed in parallel and coaxially with the inner freewheel 22. A chain 28 runs on the inner sprocket 20, the outer sprocket 24, the inner freewheel 22 and the outer freewheel 26 so that the outer sprocket 24 and the inner sprocket 20 rotate in opposite directions and the outer freewheel 26 and the inner freewheel 22 rotate in opposite directions.


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    Title :

    CHAIN-DRIVE MECHANISM FOR BICYCLE


    Contributors:

    Publication date :

    2020-09-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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