| 摘要 |
PROBLEM TO BE SOLVED: To provide a bicycle crank shaft which allows a bicycle to be more easily run, by extending a shaft length reaching a pedal from a drive axle thereby increasing momentum force, in order to materialize easier bicycle run.SOLUTION: A roughly dog leg shaped-crank shaft comprises a left rotary shaft 4 forming a roughly dog leg shaped-continuous shaft and a right rotary shaft 5 forming a reverse dog leg shaped-continuous shaft which are provided in right and left of a drive axle 2, respectively. The roughly dog leg shaped-crank shaft allows a bicycle to be run with a force smaller than before. |
