Bicycle chainwheel

Details Bicycle chainwheel Bicycle chainwheel

1995-08-31

1997-05-27

Schoeppel, Roger J.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

And additional coaxial surface for engaging same belt in...

B62M 912

Patent

active

056326998

ABSTRACT:
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.

REFERENCES:
patent: 4889521 (1989-12-01), Nagano
patent: 5073151 (1991-12-01), Nagano
patent: 5458543 (1995-10-01), Kobayashi

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