| 摘要 |
A derailleur for a bicycle, having four members which include a fitting member, two parallel linkage members and a movable member, among which four members two opposite members comprise one member pivotally supporting a cam plate in swingable relation and another member provided with a pin engageable with the cam face of the cam plate in swinging the cam plate by a pull of a control wire in changing the bicycle speed so that engagement of the cam plate with the pin defines the speed change stage position.
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