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US 5,632,699 AGranted
Bicycle chainwheel
AssigneeShimano Inc.
InventorYasushi Nakamura
Life of this patent
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AssigneeShimano Inc.
InventorYasushi Nakamura
Estimating the term…
A bicycle chainwheel has a plurality of first teeth spaced at (p-.alpha.) from each other, where p is the chain pitch, and a second tooth shaped differently from at least one of the first teeth. A sum of the pitch P between one of the first teeth disposed immediately ahead of the second tooth in a driving direction of the chainwheel and another one of the first teeth disposed behind the second tooth is greater than 2(p-.alpha.). If desired, P may be approximately equal to 2(p-.alpha.)+.alpha.. In the case where there is a plurality N of the second teeth disposed adjacent to each other, where N is an integer greater than one, then P is preferably greater than (p-.alpha.).times.(N+1), and, if desired, approximately equal to ((p-.alpha.).times.(N+1))+N.alpha.. In the case of a chainwheel having missing teeth, then a sum of the pitch P between a first one of the plurality of teeth and a second one of the plurality of teeth disposed adjacent thereto is preferably greater than (p-.alpha.).times.(N+1), where N is an integer greater than zero.
A bicycle chainwheel having a plurality of teeth spaced at (p-.alpha.) from each other, where p is the chain pitch and .alpha. is a real number greater than zero and less than p, and a sum of the pitch P between a first one of the plurality of teeth and a second one of the plurality of teeth disposed adjacent thereto on the same chainwheel is greater than (p-.alpha.).times.(N+1), where N is an integer greater than zero.
A bicycle chainwheel having a plurality of first teeth spaced at (p-.alpha.) from each other, where p is the chain pitch and a is a real number greater than zero and less than p, and a second tooth shaped differently from at least one of the first teeth, wherein a sum of the pitch P between one of the first teeth disposed immediately ahead of the second tooth on the same chainwheel in a driving direction of the chainwheel and another one of the first teeth disposed behind the second tooth on the same chainwheel is greater than 2(p-.alpha.).
A bicycle chainwheel assembly comprising a larger diameter chainwheel disposed adjacent to a smaller diameter chainwheel, at least one of the larger diameter chainwheel or the smaller diameter chainwheel having a plurality of first teeth spaced at (p-.alpha.) from each other, where p is the chain pitch and .alpha. is a real number greater than zero and less than p, and a plurality N of second teeth on the same chainwheel as the plurality of first teeth disposed adjacent to each other and shaped differently from at least one of the plurality of first teeth on the fame chainwheel, where N is an integer greater than one, and a sum of the pitch P between one of the plurality of first teeth disposed immediately ahead of the plurality of contiguously disposed second teeth on the same chainwheel in a driving direction of the chainwheel and another one of the plurality of first teeth disposed immediately behind the plurality of contiguously disposed second teeth on the same chainwheel is greater than (p-.alpha.).times.(N+1).
Dependencies are inferred from the claim text.