Multi-stage sprocket assembly for bicycle
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United States of America Patent
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-
Mar 9, 1993
Grant Date -
N/A
app pub date -
Feb 26, 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 is disclosed. In the assembly, a concave portion is provided in a small-sprocket-side face of a large sprocket for avoiding interference with a drive chain disengaged from a height-reduced tooth of the large sprocket, such that a link-connecting portion of the chain is received at a dedendum or a stepped portion of the large sprocket. Teeth of the small sprocket is phase-arranged with the receiving portion of the large sprocket such that a portion of the chain extending substantially straight rearwardly in a drive rotation direction of the sprocket assembly from the link-connecting portion of the chain received by the receiving portion of the large sprocket is engageable with a tooth of the small sprocket. The stepped portion receives the link-connecting portion at a position lower than the dedendum.
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