Cluster sprockets for bicycle transmissions and other prime movers
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United States of America Patent
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Oct 31, 2006
Grant Date -
Oct 21, 2004
app pub date -
Apr 16, 2003
filing date -
Apr 16, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention concerns a sprocket gear for facilitating the derailing of the chain of a bicycle transmission and other prime movers. The sprocket gear includes at least two sprockets axially and concentrically positioned relative to one another. Each sprocket includes a perimeter, a front face, and a back face. Gear teeth project axially from at least a first perimeter segment of the front face and at least a second perimeter segment of the front face is free of gear teeth. Gear teeth project axially from the back face perimeter at the at least second segment of the front face. No gear teeth project from the back face perimeter at the at least first perimeter segment of the front face.
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