Patent ID: 7722488

Claim:
A bicycle rear derailleur for a chain comprising: a base member configured to be mounted to a bicycle; a movable member movably coupled to the base member; a chain cage pivotally coupled to the movable member to pivot relative to the movable member about a pivot axis between at least a first orientation and a second orientation with the pivot axis being stationary relative to the movable member; a first pulley rotatably mounted relative to the movable member about a first rotation axis with the first rotation axis being offset from the pivot axis of the chain cage; a second pulley rotatably mounted to the chain cage about a second rotation axis to move with the chain cage relative to the movable member; and a chain guard member movably coupled relative to the movable member to move between a first guard position relative to the movable member and a second guard position relative to the movable member that is different from the first guard position, the chain cage being movably mounted relative to the chain guard and including an engagement portion configured and arranged to move the chain guard member from the first guard position to the second guard position relative to the movable member and each other as the chain cage moves about the pivot axis from the first orientation to the second orientation during shifting operation of the bicycle rear derailleur.