| 摘要 |
PURPOSE: A device is provided to increase the driving force of a bicycle applied a vector theory of force into a crank structure. CONSTITUTION: Two rotating shafts are combined with a connecting crank(5) to rotate similarly by installing two rotating shafts to be paralleled with a driving crankshaft(1) and a driven crankshaft(3). The length of two crank arms(3,4) is the same and the distance between the length of the combining crank and two shafts is the same to secure the similar rotation. And a curved part to form an end in the middle of the crank arm is formed to avoid the inter-clash and the interference between two shafts and two crank arms.
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