Patent ID: 9150281
Filing Date: 2015-10-06
Classification: B62M

Abstract:
1. A bicycle rear derailleur comprising: a base member including a bicycle mounting portion; a cable operated structure movably coupled to the base member, the cable operated structure including a first link member and a second link member the first link member being connected to the base member by a first pivot pin and the second link member being connected to the base member by a second pivot pin; and a movable member movably supported to the base member by the cable operated structure between a plurality of shift stage positions with respect to the base member, the plurality of shift stage positions including a top shift stage position, a low shift stage position and at least three shift stage positions between the top shift stage position and the low shift stage position, the movable member being connected to the first link member by a third pivot pin and the connected to the second link member by a fourth pivot pin; and a biasing member connected to the first and second link members at points lying outside of a quadrilateral having corners corresponding to first, second, third and fourth pivot axes of the first, second, third and fourth pivot pins, respectively, such that a percentage of a rate of change of operating energy in two adjacent shifting operations between each three consecutive shift stage positions of the movable member relative to the base member excluding the top and low shift stage positions is less than 3.7%, the percentage of the rate of change of the operating energy being determined as follows  where X is the rate of change of the operating energy, the cable operated structure including a first link member and a second link member coupling the movable member and the base member, and including a biasing member operatively connected between the first link member and the second link member such that the movable member is biased towards one of the top and low shift stage positions, the biasing member being configured to generate a biasing force, and at least one of the first and second link members being configured to be moved between adjacent shift stage positions by a cable, such that the biasing member via the biasing force and the at least one of the first and second links via a distance moved by the cable between adjacent shift stage positions are configured to affect the operating energy.