Front derailleur for a bicycle
AssigneeCampagnolo S.r.l.
InventorMarco Minto
Life of this patent
Estimating the term…
Abstract
A bicycle front derailleur that is movable between shift positions in association with an indexer. The inner mechanical end stop is adjusted at the first indexing position so there is no loosening of the control cable in the last downward gearshifting operation, with the benefit of an immediate and rapid response in the first upward gearshifting operation. The outer end stop is adjusted to interrupt the rotation of the cable-winding bush before it reaches the last indexing position. This pair of mechanical end stops limits the excursion of the derailleur to prevent it being able to shift the chain too much towards the frame or too much away from the frame, which ensures that the chain is not shifted beyond the gears.
Claims20
A front derailleur for a bicycle, comprising:
- a movable body, provided with a chain guide configured to interact with a transmission chain of the bicycle and movable between a plurality of positions comprised between an inner position and an outer position;
- a fixed body, adapted for being fixed to a part of frame of the bicycle;
- an outer connection element hinged to the fixed body about a first articulation axis and hinged to the movable body about a second articulation axis;
- an inner connection element hinged to the fixed body about a third articulation axis and hinged to the movable body about a fourth articulation axis;
- a return member active between the movable body and the inner connection element to push said chain guide in said inner position;
- and
- an actuation arm hinged to the fixed body about said first articulation axis and comprising a fastener for a control cable arranged to move away from the first articulation axis on an opposite side with respect to the second articulation axis;
- said actuation arm and said outer connection element being rigidly connected to make a rocker arm when a force exerted on said fastener is such as to determine a movement of the chain guide between the inner position and the outer position, said actuation arm rotating with respect to said outer connection element when a force exerted on said fastener is greater than a force necessary to hold the chain guide in the outer position.
Dependencies are inferred from the claim text.