| 摘要 |
An improved form of bicycle speed change mechanism, characterized in that, a speed change support is installed to sustain and keep a bicycle chain at a fixed tension; a stop ring installed on the speed change support is bent to one side to form a positioning plate that is bent outwardly; a C-type snap ring is inserted in the gap of a support shaft; one end of the C-type snap ring extends outwardly to form a handle; one end of the handle forms a horizontal plate on which two guide holes are formed; two bolts are mounted in the guide holes; adjustment of the length of the two bolts extruding from the guide holes of the horizontal plate controls the angle of rotation of the stop ring wtih respect to the baffle angle of the bicycle frame, and consequently changes the force produced by the torsion spring which is dragged by the stop ring.
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