Bicycle front derailleur
AssigneeShimano Inc.
InventorsAtsuhiro Emura, Yoshikazu Sugiyama
Life of this patent
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Abstract
A front derailleur that includes a fixing member that is configured to be fixed to a bicycle frame, a chain guide movable between a retracted position and an extended position with respect to the fixing member, a linkage mechanism coupling the chain guide to the fixing member, and a biasing member that biases the chain guide toward one of the retracted position and the extended position. The linkage mechanism includes a first link member that is pivotable with respect to the fixing member about a first axis and is pivotable with respect to the chain guide about a second axis that is positioned above the first axis when the fixing member is fixed to the bicycle frame. The biasing member is coaxially arranged around the second axis.
Claims18
A front derailleur comprising:
- a fixing member that is configured to be fixed to a bicycle frame;
- a chain guide movable between a retracted position and an extended position with respect to the fixing member;
- a linkage mechanism coupling the chain guide to the fixing member, the linkage mechanism including a first link member being pivotable with respect to the fixing member about a first axis and being pivotable with respect to the chain guide about a second axis that is positioned above the first axis when the fixing member is fixed to the bicycle frame;
- and
- a biasing member that biases the chain guide toward one of the retracted position and the extended position, the biasing member coaxially arranged around the second axis.
A front derailleur comprising:
- a fixing member that is configured to be fixed to a bicycle frame, wherein the fixing member defines a fixing member axis;
- a chain guide movable between a retracted position and an extended position with respect to the fixing member;
- a linkage mechanism coupling the chain guide to the fixing member, the linkage mechanism including a first link member being pivotable with respect to the fixing member about a first axis and being pivotable with respect to the chain guide about a second axis that is positioned above the first axis when the fixing member is fixed to the bicycle frame, the first link member having a first arm and a second arm that both extend between the first and second axes respectively;
- and
- a biasing member that biases the chain guide toward one of the retracted position and the extended position, the biasing member disposed between the first arm and the second arm and coaxially around one of the first axis or the second axis.
Dependencies are inferred from the claim text.