| 摘要 |
The supporting structure of a rear wheel derailleur mechanism for the rear wheel of a bicycle or like vehicle is connected to the carrier element for a chain guiding sprocket by an elongated link and an elongated guide. First and second pivots connect respective first longitudinal end portions of the link and guide to the supporting structure, and third and fourth pivots connect the second longitudinal end portions of the link and guide to the carrier element. A fifth pivot connects respective intersecting central portions of the link and guide. The axes of the several pivots are at least approximately parallel. The three pivots associated with the link practically prevent shifting of their pivot axes relative to the link and the connected devices, whereas the pivots at the end portions of the guide permit translatory movement of their pivot axes. A chain wheel is mounted on the carrier element for rotation in a plane transverse to the axis of rotation of the associated rear wheel, and the link and guide may be pivoted manually relative to each other about the axis of the fifth pivot.
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