Patent ID: 6641495
Filing Date: 2003-11-04
Classification: B62M

Abstract:
A front derailleur for selectively derailing a transmission chain between chain rings on a bicycle having at least one down tube located adjacent the chain ring, the derailleur comprising:an anchoring fork for mounting on a tube of the bicycle; a fixed body rigidly attached to the anchoring fork; a first arm, having first and second ends with the first end pivotably attached to the fixed body at a first location; a second arm, having first and second ends with the first end pivotably attached to the fixed body at a second location displaced from the first location; an inner plate aligned substantially parallel to the chain ring; an inner upper bridge aligned substantially orthogonal to and attached to the inner plate at a position substantially opposite to the chain ring, and extending in a direction substantially opposite to the bicycle tube; a first pair of substantially parallel tabs, rigidly attached to the inner upper bridge and aligned substantially orthogonal thereto, extending in a direction substantially opposite the chain ring, the first pair of tabs pivotably attached to the second end of the first arm; a second pair of substantially parallel tabs, rigidly attached to the inner plate and aligned substantially orthogonal thereto, extending in a direction substantially toward the tube, the second pair of tabs pivotably attached to the second end of the second arm; an outer plate aligned substantially parallel to the inner plate and spaced from the inner plate; an outer upper bridge, rigidly attached to the outer plate and aligned substantially orthogonal thereto, located at an end of the outer plate substantially opposite to the at least one chain ring, and extending in a direction substantially toward the bicycle tube, the outer upper bridge being removably fastened to the inner upper bridge; a solid plate rear bridge, extending between the inner and outer plates, removably fastened to an end of the inner plate substantially farthest from the inner upper bridge.