Sprocket guard and guide ring for bicycle cranks
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United States of America Patent
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Issued Date -
Mar 16, 2006
app pub date -
Sep 15, 2005
filing date -
Sep 16, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bicycle sprocket guard that includes an inner ring and an outer ring. The guard is a pair of rings mounted together and attached to the sprocket, preferably by sandwiching the crank plate between the sprocket and the guard rings. The outer ring has low elongation, such as with a polycarbonate, to avoid interfering with the chain upon impact with hard objects. The inner ring is strong to resist deformation and absorb shock impacts from the outer ring. The inner ring will not crack under the concentrated forces at the fasteners, nor will the outer ring deform to interfere with the chain when impacting hard surfaces.
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