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


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    Title :

    Chain-drive mechanism for bicycle


    Contributors:

    Publication date :

    2021-04-13


    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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