| 摘要 |
A device related to the rear derailleur of a bicycle. It includes a fixed member which is fixed on the rear fork of the bicycle with a fixed screw, a shock absorbing member which is fixed on the fixed member to reduce the shock when rider changing the gear ratio, a outer linkage and a inner linkage, with parallel moving mechanism formed by a parallelogram set, to tug the movable member in order to fulfill the purpose of changing speed; a guiding pulley/chain member which comprises a upper guiding pulley, a lower guiding pulley and a guiding chain, while said upper guiding pulley is connected to the upper part of said guiding chain and said lower guiding pulley is connected to the lower part of said guiding chain. Furthermore, the said guiding pulley and chain member is connected to the movable member via a rotating set. The fixed member, the shock absorbing member, the outer linkage, the movable member and the guiding pulley/chain member are all made of plastic and there is a metal washer on one end of the outer linkage to provide protect function between the metal length micro-adjusting screw and the outer linkage.
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