Multi-speed sprocket assembly

Details Multi-speed sprocket assembly Multi-speed sprocket assembly

2008-09-19

2011-11-29

Dondero, William E (Department: 3654)

Endless belt power transmission systems or components

Positive drive pulley or guide roll

And additional coaxial surface for engaging same belt in...

Reexamination Certificate

active

08066603

ABSTRACT:
A multi-speed sprocket assembly is provided for engaging a bicycle chain displaceable by a derailleur. The multi-speed sprocket assembly generally includes at least one smaller sprocket and at least one larger sprocket. The larger sprocket includes first and second transitional segments for alternatively receiving a shifting chain segment of the bicycle chain shifting from the smaller sprocket to the larger sprocket. The first transitional segment includes a first run-on ramp configured to receive an outer link plate of the shifting chain segment. The first run-on ramp has a first support point configured to bend the transferring bicycle chain at a first angle to position a first chain roller against a no-load tooth flank of the larger sprocket while a second chain roller rests against a load tooth flank of the smaller sprocket. The second transitional segment includes a second run-on ramp configured to receive the outer link plate of the shifting chain segment. The second run-on ramp has a second support point configured to bend the shifting chain segment at a second angle to position the first chain roller against the no-load tooth flank of the larger sprocket while the second chain roller rests against the load tooth flank of the smaller sprocket.

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