| 摘要 |
A rear derailleur for a bicycle that is small, light, low in production cost and free from damage when the bicycle falls on the ground. This rear derailleur comprises a base member (12) supported on a bicycle frame (4) in front of a multi-staged sprocket (3) supported in turn around a hub shaft (2), an oscillating member (6) connected to this base member at the proximal portion thereof in such a manner as to oscillate in a widthwise direction of a wheel and extending rearwardly, and a chain guide (9) which rotatably supports a guide pulley (7) and a tension pulley (8) and is supported at the rear end portion of the oscillating member (6) in such a manner as to rotate about a shaft substantially in parallel with the hub shaft while being elastically biassed in a direction in which a tension is applied to the chain, wherein the guide pulley is oscillated in the widthwise direction of a wheel by drawing a speed-change operation cable connected to the above oscillating member, whereby the chain is switched to a desirable sprocket for engagement therewith. <IMAGE> |
