Bicycle front derailleur
AssigneeShimano Inc.
InventorsTadashi Ichida, Kazuhiro Fujii, Yoshihiro Oda
Life of this patent
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Abstract
A bicycle front derailleur is configured to facilitate a chain returning to a sprocket during an upshifting operation if the chain drops off. The front derailleur basically has a fixed member, a chain guide and a moving mechanism. The fixed member can be fastened to a bicycle. The chain guide has an inner plate and an outer plate with a gap between the outer plate and the inner plate. The chain guide guides the chain between itself and the inner plate. The chain guide is free to move with respect to the fixed member. The inner plate has a first protruding part that protrudes toward the outer plate on the rear end, which is the chain entry side. The moving mechanism is a mechanism that is used to cause the chain guide to move.
Claims19
A bicycle front derailleur comprising:
- a fixed member configured and arranged to be fixedly attached to bicycle;
- a chain guide configured to move between a retracted position and an extended position relative to the fixing base, the chain guide including an inside member and an outside member defining a chain receiving slot to guide a chain, the inside member has a rear end with a protruding part disposed on a chain entry side of the chain receiving slot, and protruding towards the outside member;
- and
- a moving mechanism coupled between the fixed member and the chain guide to move the chain guide between the retracted position and the extended position.
Dependencies are inferred from the claim text.