Patent ID: 7291079
Filing Date: 2007-11-06
Classification: B62M

Abstract:
1. A motorized bicycle front derailleur assembly comprising: a motor unit having an output shaft being configured and arranged to rotate between a first rotational position and a second rotational position; a front derailleur operatively coupled to the output shaft, the front derailleur including a fixing body, a chain guide, and a derailleur linkage operatively coupled between the fixing body and the chain guide; and a motor linkage coupled between the output shaft and the derailleur linkage to move the chain guide between a first shift position corresponding to the first rotational position and a second shift position corresponding to the second rotational position in response to rotation of the output shaft, the motor linkage including a jamming protection arrangement that is configured and arranged with respect to the derailleur linkage to move between a force transmitting state in which the motor linkage forms a rigid force transmitting connection to move the chain guide and a force override state in which the motor linkage forms a non-rigid force overriding connection due to a jamming force being transmitted by the derailleur linkage to the motor linkage such that the motor can rotate to the first rotational position from the second rotational position when the chain guide is jammed in the second shift position.