Patent ID: 8678962

Claim:
A front derailleur for a bicycle having a frame member and a chain engaging one of a plurality of chainwheels, the frame member having a longitudinal axis, the front derailleur comprising: a mount configured to be fixed to the frame member; a movable element separate from the mount and interiorly receiving a portion of the chain, the movable element contacting an exterior side of the chain to laterally displace the chain between the plurality of chainwheels; and a linkage connecting the movable element to the mount and configured to move the movable element laterally with respect to the frame member and rotatably about a yaw axis substantially parallel to the longitudinal axis, wherein the movable element includes a cage having two side plates fixed relative to each other, the two side plates spaced apart from each other and interiorly receiving the portion of the chain therebetween, the side plates contacting the exterior side of the chain to laterally displace the chain between the plurality of chainwheels, and wherein the linkage includes a first link member connecting the cage to the mount and configured to move the cage laterally with respect to the frame member and rotatably about the yaw axis, the first link member being pivotally connected to the mount about a first pivot axis, and the first link member being pivotally connected to the cage about a second pivot axis, wherein the second pivot axis is at a first non-zero angle relative to the first pivot axis.