| 摘要 |
A derailleur apparatus for bicycles includes a housing on a handle and a gearshift control assembly inside the housing. The gearshift control assembly has a first lever for cable-pulling, a ratchet assembly having a ratchet plate further having teeth, a second lever for cable-releasing, and an index claw. The first lever has a first pawl to keep the ratchet assembly at an initial position. The derailleur apparatus is characterized on that: the index claw further has a matching member and a second pawl, the second lever and the matching member form a first specific contact and a specific actuation relationship, and the second lever can move arbitrarily. While the second lever moves to form a second specific contact with the matching member, the index claw rotates to mesh the second pawl with the ratchet plate, such that the down-shift movement toward a second direction can be performed. |
