Patent ID: 7666111
Filing Date: 2010-02-23
Classification: B62M

Abstract:
1. A bicycle rear derailleur comprising: a base portion arranged and configured for attachment to a bicycle frame; a coupling mechanism having a first end and a second end, the first end being coupled to the base portion, the second end being movable relative to the base portion; a movable member coupled to the second end of the coupling mechanism; a pivot shaft coupled to the movable member; a tension plate pivotally coupled to the movable member by the pivot shaft, the tension plate supporting a chain tensioning pulley, the tension plate including a mounting end and a pulley supporting end, the mounting end coupled to the pivot shaft and the pulley supporting end supporting the chain tensioning pulley, the pulley supporting end being laterally offset from the mounting end; a biasing spring operatively coupled to the movable member and the tension plate for biasing the tension plate in a chain tensioning direction without biasing the guide plate; and a guide plate being rotatably coupled to the pivot shaft to move relative to the tension plate and disposed adjacent to the tension plate with the tension plate disposed between the movable member and the guide plate along the pivot shaft, the guide plate rotatably supporting a chain guiding pulley.