| 摘要 |
PURPOSE: A chainless driving device for a bicycle is provided to improve the driving efficiency of the bicycle by lifting a pair of levers up and down. CONSTITUTION: A chainless driving device for a bicycle is composed of a pair of free wheels(20) coupled to both sides of a hub(3) in a rear wheel(2), coupling units(22) formed at the free wheels, a pair of levers(30) coupled to the coupling units respectively and having pedals(32), a guide roller(41) rotatably installed at one side of a frame(4), and a lever lifting unit(40). The lever lifting unit is coupled to the guide roller, and includes a wire(42) fixed to the levers to lift the levers up/down. |
