| 摘要 |
The device for obtaining a forward driving force has first transmission to give drive force by driving first free wheel and this occurs when the crank shaft is forwardly rotated. A second transmission obtains a forward driving force by converting the direction of the rotating force produced in a rotational direction of a second drive. The rotational direction is supplied to a second free wheel (22) under a reverse rotation of the crank shaft. A driving chain (21) is rotated by a chain gear (20) coupled to the crank shaft. A forward driving force is obtained regardless of the rotational direction of the crank shaft, and improves an excercise effect.
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