US Patent 11407476 Derailleur for human-powered vehicle

A derailleur comprises a base member configured to be attached to a human-powered vehicle frame, a movable member movable relative to the base member, a pulley assembly configured to be pivotally attached to the movable member with respect to a pivot axis, and a biasing member configured to apply biasing force to the pulley assembly. The biasing member includes a first biasing member and a second biasing member.