| 摘要 |
A drive mechanism for a bicycle is provided including a pedal leverage arm, a drive sprocket spindle, a drive sprocket, a drive gear, and a vertical gear on each side of the bicycle. The vertical gear is attached to the pedal leverage arm so that the vertical gear can mesh with the drive sprocket. A chain on each side of the bicycle extends around the drive gear and a wheel sprocket. Downward movement of a pedal leverage arm causes the attached vertical gear to move downward, causing the meshed drive gear to turn, which causes the drive sprocket spindle on that side of the bicycle to turn, which causes the chain that goes around the drive sprocket on that side of the bicycle to turn, which causes the wheel sprocket and a rear wheel to turn, due to permanent attachment of both the drive sprocket and drive gear to the drive sprocket spindle.
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