Patent ID: 8932162
Filing Date: 2015-01-13
Classification: B62M

Abstract:
1. 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 second link member that is pivotable with respect to the fixing member about a third axis and that is pivotable with respect to the chain guide about a fourth axis that is positioned above the third axis when the fixing member is fixed to a bicycle frame, wherein the first link member and the second link member form a four bar linkage, and wherein the second axis is positioned between the fourth axis and the chain guide; 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.