| 摘要 |
The pedal cranks (32, 34) on the propulsion group of a bicycle or similar rotate independently with respect to one another around axis (a), which is parallel and spaced at a distance (d) from axis (b) of a chain drive sprocket wheel (28). Each pedal crank is constrained to rotate together with the sprocket wheel but is free to travel over the same. An adjustment for the position of the sprocket wheel, around the axis of the pedal cranks, is provided for./!
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