Patent ID: 7361110
Filing Date: 2008-04-22
Classification: B62M

Abstract:
1. A bicycle rear derailleur, which is mounted on a bicycle frame so as to selectively derail the chain resting upon any of a multiple number of sprockets mounted on a rear hub axis, which is equipped with a base component, which is mounted onto the aforementioned frame; a link mechanism, one end of which is mounted on the aforementioned base component; a movable component, which is mounted on the other end of the aforementioned link mechanism, and which can be relatively displaced from the aforementioned base component; an outer plate, which is mounted on the aforementioned movable component so as to undulate like a see-saw; an inner plate, which is installed so as to face the aforementioned outer plate; a guide pulley, which is mounted onto a portion onto one edge of the aforementioned plates, between the aforementioned plates, so as to freely rotate and move in the axial direction, and which can be engaged by means of the aforementioned chain; and a tension pulley, which can be engaged with the aforementioned chain, the engagement center of which is set at a position closer to the aforementioned outer plate than to the engagement center of the aforementioned guide pulley, and which is mounted onto a portion on the other edge of the aforementioned plates, between the aforementioned plates, so as to freely rotate.