| 摘要 |
The invention concerns a transmission device for bicycles and the like of the type wherein a toothed chain-wheel, driven by the user, transmits the movement to the wheel (1) via a sprocket (13), with an interposed free-wheel device (18). The invention is characterized in that the toothed chain-wheel (4) is mounted on the shaft (2) of the wheel (1) and drives a sprocket (14) on the shaft of which is keyed a second sprocket (15) driving the sprocket (13) of the wheel via planetary gear wheels. The toothed chain-wheel (4) is driven with an interposed free-wheel device, by a sprocket (6) meshing with a toothed sector located at the end of an arm articulated on the machine through its other free end and extending beyond its pivot pin into a lever on the free end of which the user acts.
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