| 摘要 |
<p>The invention relates to an improved driving flange with pedals comprising a derailleur adaptable to the shaft which is driven by the pedals. This device is comprised of a casing (1) wherein is arranged a system of keys (3 and 4) which actuate a second shaft (5) parallel to the prior shaft and which transmits the motion to a third shaft (12) through two sets of gears (6, 7, 8), (9, 10, 11) which are facing each other, the gears of the first set being free to the exception of one of them which is keyed by a key (18) displaced along the shaft by means of a spring mechanism (20), thereby varying the relationship of the gear shifting mechanism between the two sets of gears. The third shaft supports at one of its extremities the toothed flange (13) by means of a support (15) which can slide in the axial direction by means of ball bearings (14) in order to align the flange (13) with the chain and the pinion.</p> |
