| 摘要 |
A double lever assembly for bicycle speed control comprising: a first lever (10) for operating a rear derailleur by means of a control cable in order to shift an endless drive chain from one rear sprocket onto a selected rear sprocket of a multiple freewheel; a second lever (26) for operating a front derailleur by means of a further control cable in order to shift the chain from one front sprocket onto another front sprocket of a chainwheel; and motion converting mechanism (40, 41) for converting pivotal motion of the first lever (10) into synchronized reciprocating motion of the second lever (20) so as to automatically center a guide cage of the front derailleur over a chain line thereby to prevent the chain from hitting the inside of the guide cage. |
