Patent ID: 8444514

Claim:
A front derailleur chain detachment prevention member comprising: a mounting part configured and arranged to be detachable and reinstallable to an inner plate of a chain guide of a front derailleur at a mounting point of the mounting part that connects the mounting part to the chain guide; a connecting part having a rearward end coupled to the mounting part and a forward end located forwardly from the mounting part, the connecting part having a length from the rearward end to the forward end in a lengthwise direction of a bicycle frame with respect to a center axis of a seat tube of the bicycle frame when the front derailleur is mounted to the bicycle frame, the length of the connecting part extending along a majority of the inner plate with a tip of the forward end of the connecting part being cantilevered relative to the mounting point of the mounting part when installed on the chain guide of the front derailleur to be resiliently supported such that the majority of the length of the connecting part is laterally deflectable relative to the mounting point of the mounting part with deflection of the connecting part relative to the chain guide occurring adjacent the mounting point of the mounting part; a regulating part disposed at the tip of the forward end of the connecting part and the regulating part projecting outwardly from the connecting part in a lateral direction from the inner plate toward an outer plate of the chain guide when the front derailleur chain detachment prevention member is installed on the chain guide of the front derailleur; and a force exerting member configured and arranged as an elastic body that exerts a force on the regulating part toward the outer plate.