| 摘要 |
A derailleur (10) for a bicycle for changing the speed of the bicycle. The derailleur (10) can be distinguished from prior parallelogram designs in employing stationary guide rods (4) over which a pulley wheel assembly (5) is caused to slide as the bicycle's drive chain (16) is shifted between various drive sprocket wheels (13, 14). Gear shifting is done in a linear motion while being able to center the derailleur's pulley assembly (5) without the use of a return spring which is currently employed by present day parallelogram derailleurs.
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