Patent ID: 7438657

Claim:
A bicycle front derailleur comprising: a fixing member configured to be attached to a bicycle frame, the fixing member including a first attachment flange and a second attachment flange axially aligned with one another, the second attachment flange being spaced apart in an axial direction from the first attachment flange; a chain guide coupled to the fixing member to move between a retracted position and an extended position in a transverse direction relative to fixing member and the bicycle frame; a linkage mechanism coupling the chain guide to the fixing member to move the chain guide between the retracted position and the extended position, the linkage mechanism comprising a first link pivotally coupled to the fixing member about a first rotational axis, a second link pivotally coupled to the first and second attachment flanges by first and second pivot pins, respectively, such that rotation occurs about a second rotational axis that is substantially parallel to the first rotational axis, and a third link pivotally coupled to both the first and second links forming a four-member linkage mechanism along with the fixing member for movement of the chain guide, the first pivot pin having a first end fixed to the second link to substantially prevent axial movement relative to the second link, and a second end free of any mechanical retaining connection with the first attachment flange that prevents axial movement relative to the first attachment flange, and the second end of the first pivot pin being axially arranged between oppositely facing axial end surfaces of the first attachment flange.