Multi-stage sprocket assembly for bicycle
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United States of America Patent
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-
Feb 4, 1992
Grant Date -
N/A
app pub date -
Feb 19, 1991
filing date -
Feb 28, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-stage sprocket assembly for a bicycle, having a larger sprocket and a smaller sprocket attached adjacent to each other. The larger sprocket has a concave portion defined in a side face thereof opposite to the smaller sprocket. The concave portion is configurated along a moving path of an intefering plate portion of a drive chain shifting from the smaller sprocket to the larger sprocket, the interfering plate portion being positioned forwardly in a drive rotation direction of the sprocket assembly relative to an engagement-leading plate portion of the chain which first engages a tooth of the larger sprocket.
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