Patent ID: 7651424

Claim:
A bicycle front derailleur comprising: a fixed member including a frame mounting portion having at least one frame mounting hole and a linkage support portion; a chain guide configured to move between a retracted position and an extended position relative to the fixed member; a linkage assembly coupled between the linkage support portion and the chain guide in order to move the chain guide between the retracted position and the extended position; and a mounting fixture adjustably coupled to the fixed member, the mounting fixture including at least one frame fastener disposed in the frame mounting hole, a pair of first washer members disposed on a first side of the frame mounting portion and a pair of second washer members disposed on a second side of the frame mounting portion with the at least one frame fastener extending through the first and second washer members, one of the first washer members having a first convex contact surface that contacts a first concave contact surface of the other of the first washer members, and one of the second washer members having a second convex contact surface that contacts a second concave contact surface of the other of the second washer members, the first and second convex contact surfaces being convex in only one direction and the first and second concave contact surfaces being concave in only one direction, with each of the first and second convex contact surfaces and each of the first and second concave contact surfaces having a respective center of curvature located along a single axis that is parallel to a longitudinal plane of a bicycle having the front derailleur, the first and second washer members having through holes with widths larger than a diameter of the frame fastener in at least a direction extending along arcs of the first and second concave surfaces such that the first and second washer members can shift relative to the frame fastener and with respect to each other to adjust an angular orientation of the chain guide and an angular orientation of the frame mounting portion relative to the longitudinal plane only in a direction transverse to the longitudinal plane.