Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...
Patent
1995-10-18
1998-06-02
Graysay, Tamara L.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
Including belt shiftable axially from one to another surface...
474152, 474158, 474160, F16H 5530, B62M 912
Patent
active
057591245
ABSTRACT:
A multistage sprocket assembly for a bicycle with at least one large sprocket and one small sprocket disposed adjacent to each other and assembled in a relationship such that the distance between the escape point between a pair of adjacent teeth at the large sprocket and the engagement point between a pair of adjacent teeth at the small sprocket is small than an integer multiple of the chain pitch. A recess portion is formed at the side surface of the large sprocket facing the small sprocket to prevent interference between the side link plate of the chain with the side surface of the large sprocket when the chain is being shifted from the large sprocket to the small sprocket. The chain between the aforesaid escape point and engagement point is also supported by the recess portion and forms a nonlinear upshifting path as seen from an axial direction from the small sprocket to the large sprocket.
REFERENCES:
patent: 4259880 (1981-04-01), Ueno
patent: 4612004 (1986-09-01), Nagano
patent: 4988328 (1991-01-01), Iwasaki et al.
patent: 5133695 (1992-07-01), Kobayashi
patent: 5188569 (1993-02-01), Kobayashi
patent: 5192250 (1993-03-01), Kobayashi
Graysay Tamara L.
Hartmann Gary S.
National Science Council
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