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US 7,025,698 B2Granted
Front derailleur with annular chain guide, bicycle and method of operation
OwnerChristopher Alan Wickliffeinventor
Life of this patent
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OwnerChristopher Alan Wickliffeinventor
Estimating the term…
A front derailleur including an annular chain guide for engagement and disengagement of a bicycle chain with multiple chain rings of a crankset. The annular chain guide may be positioned by linear guide rods. The annular chain guide may have an inner lifting surface and an outer pulling surface for engaging diametrically opposed corners of a chain when viewed in cross-section. The annular chain guide may have an opening defined by a polygon having at least five sides. The motion of the annular chain guide during a up-shift, i.e., displacement of the chain from a smaller chain ring to a next larger chain ring includes an upward, outward and rearward linear motion relative to a bicycle frame including upward force exerted by the annular chain guide against the chain. The motion of the annular chain guide during a down-shift is exactly opposite whereby the annular chain guide exerts a pulling down force against the chain.
A front derailleur for a bicycle, comprising:
A front derailleur for a bicycle, comprising:
A front derailleur for a bicycle, comprising:
A method for up-shifting a bicycle chain from a first chain ring of a first radius to a second chain ring of a second radius larger than the first radius while the chain rings are rotating in a direction consistent with forward bicycle motion, the method comprising:
A method for down-shifting a bicycle chain from a first chain ring of a first radius to a second chain ring of a second radius smaller than the first radius while the chain rings are rotating in a direction consistent with forward bicycle motion, the method comprising:
Dependencies are inferred from the claim text.