Control device for a bicycle derailleur

摘要

A control device for a derailleur of a bicycle is described, comprising a support body, a cable-winding bush supported for rotation with respect to the support body, an indexer mechanism housed in the support body and suitable for controlling the angular position of the cable-winding bush, and a single manual actuation lever, the indexer mechanism comprising a toothed wheel integral in rotation with the cable-winding bush and having a first and a second plurality of slanting teeth, a first pawl integral with a driven arm of the lever and brought into thrusting engagement upon the first teeth while the lever is manually moved in a first direction beyond a predetermined rotation threshold, and a second pawl driven out of retention engagement with the second teeth by the driven arm of the lever while the lever is manually moved in the first direction up to the predetermined rotation threshold.

主权项

1. Control device for a bicycle derailleur, comprising:
a support body; a cable-winding bush supported for rotation with respect to the support body; an indexer mechanism housed in the support body and suitable for controlling an angular position of the cable-winding bush; and a single manual actuation lever mounted to the support body such that the lever rotates about first and second pivots having separate parallel axes;
wherein the indexer mechanism comprises:
a toothed wheel that rotates with the cable-winding bush, so that there is no relative movement between the toothed wheel and the cable-winding bush, and has a first plurality of slanting teeth and a second plurality of slanting teeth,a first pawl that has a connection to a driven arm of the lever and moves with the driven arm of the lever, the first pawl is capable of rotating about the axis of the first and/or the second pivot with the driven arm of the lever when the driven arm of the lever rotates about the axes of the first and second pivots, but the first pawl is not capable of rotating with respect to the driven arm of the lever about any pivot having an axis parallel to the axes of the first and second pivots and is in thrusting engagement with the first teeth while the lever is manually moved in a first direction beyond a predetermined rotation threshold, anda second pawl driven out of retention engagement with the second teeth by the driven arm of the lever while the lever is manually moved in the first direction up to the predetermined rotation threshold.