| 摘要 |
<p>An automatic shifter for derailleur which includes a pivot arm (42) secured to the frame (38) of the bicycle in a stationary relationship. A shifter arm (44) pivotally secured to the pivot arm in a manner to rotatively move relative to the frame, a follower (58) attached to the shifter in rotative engagement, an operating spring biasing between the pivot arm and the shifter arm to continuously urge the follower against the upper run of the bicycle chain to depress the chain; a stabilizer (88) interconnected between the pivot arm and the shifter arm in a manner to allow substantially unrestricted counter-clockwise rotation of the shifter arm and to deter or restrict clockwise rotative movement of the shifter arm and a flexible cable (78) interconnecting the shifter arm with the derailleur whereby the derailleur will be automatically operated to index the chain across the small diameter cluster gears in response to rotational movement of the shifter arm as caused by interaction of the bicycle chain and the follower.</p> |
