IPC Definitions - January 01, 2012
B62M 9/122 - Definition
This group covers:
Electric or fluid assisted rear derailleurs and control methods therefor for shifting chains by rear derailleurs. Contrary to the directly manual actuated derailleur, these shifting devices are assisted by a small electric or fluid operated servos connected to the derailleur mechanism.
Attention is drawn to the following places, which may be of interest for search:
Actuators for gearing speed-change mechanisms specially adapted for cycles with electrical or fluid transmitting systems | B62M 25/08 |