| 摘要 |
The derailleur has a support ring secured to the seat tube of the bicycle frame. The support ring has a side extension on which two links are pivoted. The two links are further pivoted to a chain mover member through which the drive chain extends to be moved by it. The two links, the side extension and the chain mover member form a parallelogram linkage. One of the links has a sideways lever attached to it with a control cable secured to the lever so that by pulling the control cable with a manual shifter, the lever rotates the link about the pivot with the side extension so as to move the chain mover member with the coupling of the other pivot to the chain mover member. A biasing spring is disposed between the support ring and the link having the lever thereon to bias the link to an originally-set position. Stroke adjusting screws are provided on the side extension, which screws have an adjustable length relative to the links for adjusting the rotation range of the links and thus the stroke of the chain mover member.
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