Patent ID: 7895914
Filing Date: 2011-03-01
Classification: B62K,B62M,Y10T

Abstract:
1. A command device for a bicycle gear change, comprising: a rotating drum ( 2 ) provided with a rotation axis (x) and being predisposed to rotate in opposite directions in order to wind at least a portion of a change-activating cable ( 3 ) on a lateral surface of the rotating drum ( 2 ); means for rotating, predisposed on command to rotate the rotating drum ( 2 ) in opposite directions according to predetermined angular steps; means for retaining predisposed to hold the rotating drum ( 2 ) in a position in absence of commands made to the means for rotating; wherein the rotation axis (x) of the rotating drum ( 2 ) is perpendicular with respect to an advancement direction of the bicycle, the means for rotation comprising elastic means ( 24 ), associated to the rotating drum ( 2 ) and predisposed to set the rotating drum ( 2 ) in rotation in an unwinding direction of the cable ( 3 ); a stop mechanism ( 25 ) being actionable between a stop configuration, in which it prevents rotation of the rotating drum ( 2 ) in an unwinding direction of the cable ( 3 ), and a release configuration, in which it enables a rotation of the rotating drum ( 2 ) in an unwinding direction of the cable ( 3 ), in a determined angular step, the stop mechanism comprising: a second cogging ( 26 ), solid in rotation with the rotating drum ( 2 ); a stop cog ( 27 ), mobile between a first position, in which it is engaged to the second cogging ( 26 ) and prevents rotation of the rotating drum ( 2 ) in the unwinding direction of the cable ( 3 ), and a second position, in which it does not engage with the second cogging ( 26 ); an oscillating cog ( 28 ), rotatingly constrained to the stop cog ( 27 ) about an oscillation axis and free to rotate by a determined angle; the oscillating cog ( 28 ) being positioned with respect to the stop cog ( 27 ) in such a way that, in the first position of the stop cog ( 27 ) the oscillating cog ( 28 ) does not engage with the second cogging ( 26 ), while in the second position of the stop cog ( 27 ) the oscillating cog ( 28 ) engages with the second cogging ( 26 ).