Patent attributes
A bicycle shifting mechanism is provided with a wire takeup member and a positioning mechanism. The wire takeup member rotates about a rotational axis to wind and release an inner wire of a shift cable. The positioning mechanism selectively maintains the takeup member in one of a plurality of predetermined shift positions. The positioning mechanism has a first movable positioning member, a second movable positioning member separately movable relative to the first positioning member, a first toothed segment that moves with the takeup member, a second toothed segment that moves with the takeup member. The first and second movable positioning members alternately engage and disengage one of the first and second toothed segments, respectively, as the first and second movable positioning members are moved to perform a shifting operation between sequential shift positions.
