| 摘要 |
A forward-drive apparatus for a bicycle comprises a drive transferring portion including a pedal fixed to a pedal shaft of a bicycle and for transferring the drive force to a drive sprocket connected by means of a chain to a rear wheel; a drive switching portion for enabling the drive force generated from the drive transferring portion to rotate the rear wheel in a forward or idle state; and a drive coupling portion for enabling the forward or idle rotation of the drive sprocket according to the operation of the drive switching portion, and for working the bicycle in a forward or idle rotation according to the selection of a lever during the back-pedaling of the bicycle, thereby relieving user's fatigue, preventing the loss of the physical energy and enabling the well-muscled movement of legs in every-day life.
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