| 摘要 |
A bicycle derailleur operable by a control cable to shift a chain between a large gear and a small gear, includes a parallelogram link mechanism having a base member connectable to a bicycle frame, a support member, and a pair of pivotal links extending between the support member and the base member, and a return spring for biasing the support member in one direction. A shift control member connectable to the control cable is supported by the parallelogram link mechanism to be displaceable relative thereto between a first position for contacting the parallelogram link mechanism and a second position separated therefrom. The return spring is a tension coil type spring connected at one end thereof to the shift control member and at the other end to the parallelogram link mechanism. The return spring biases the support member in one direction through the shift control member. The shift control member is operable, by an operating force applied through the control cable, to displace the support member through the return spring in a direction opposite to the direction in which the support member is biased by the return spring.
|
