Multistage sprocket assembly for a bicycle

Details Multistage sprocket assembly for a bicycle Multistage sprocket assembly for a bicycle

1988-10-24

1989-12-26

Bui, Thuy M.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

Having axially spaced sets of belt-engaging surfaces

F16H 1108

Patent

active

048895210

ABSTRACT:
A multistage sprocket assembly is provided which includes at least one larger diameter sprocket and at least one smaller diameter sprocket assembled in a relationship such that the center point between a pair of adjacent teeth at the larger diameter sprocket and the center point between a pair of adjacent teeth at the smaller diameter sprocket are positioned on a tangent extending along the chain path when the chain is being shifted from the smaller diameter sprocket to the larger diameter sprocket. The distance between both the center points is equal to an integer multiple of the chain pitch. A chain guide portion is provided at the inside surface of the larger diameter sprocket and at a position corresponding to a moving path of a driving chain traveling between the aforesaid center points for allowing the chain to move axially of the sprocket assembly slightly toward the larger diameter sprocket during shifting.

REFERENCES:
patent: 4330286 (1982-05-01), Nagano

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