| 摘要 |
This device, which can be fitted to the hub of a wheel with a tyre, comprises a notched wheel 1 which can be mounted in the place of the wheel with a tyre, driving a toothed belt 12 on its two faces which passes over two series of toothed rollers 7 to 11, characterised in that one of them serves to push the toothed belt onto the drive wheel and the other serves to transmit the weight of the vehicle and the drive power to the ground. <IMAGE>
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