Patent ID: RE41782

Claim:
A derailleur for a bicycle comprising: a base member for attaching the derailleur to the bicycle; a movable member for supporting a chain guide; a linkage mechanism coupling the base member to the movable member so that the movable member is capable of movement relative to the base member; wherein the linkage mechanism is moved by rotating a pivot shaft; an electrically operated actuating member operatively coupled to the linkage mechanism, wherein moving the actuating member in a first direction causes the movable member to move laterally toward the bicycle and moving the actuating member in a second direction causes the movable member to move laterally away from the bicycle; and a power storing mechanism disposed in a first power transmission path and in a different second power transmission path between the actuating member and the movable member for storing forces directed from the actuating member toward the movable member in a first force direction along the first power transmission path and from the actuating member toward the movable member in a second force direction along the second power transmission path, wherein the first force direction is different from the second force direction ; wherein the power storing mechanism is disposed in at least one of the first power transmission path or the second power transmission path downstream of the pivot shaft from the pivot shaft toward the movable member when the pivot shaft is rotated .