Bicycle multiple chainwheel

Details Bicycle multiple chainwheel Bicycle multiple chainwheel

1990-03-05

1991-01-29

Bui, Thuy M.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

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

745942, F16H 5530

Patent

active

049883283

ABSTRACT:
The present invention provides a bicycle multiple chainwheel to be mounted on a pedalling crank assembly. The chainwheel, which is held in driving engagement with a chain, comprises a larger sprocket and at least one smaller sprocket coaxial with the larger sprocket. When shifting the chain from the larger sprocket to the smaller sprocket, the chain normally starts disengaging from the larger sprocket at one of specific circumferential positions thereof. In view of this, the larger sprocket is made to have local chain guide portions only at those positions necessary for preventing the thus disengaged chain from being trapped in an axial gap between the larger and smaller sprockets.

REFERENCES:
patent: 3550465 (1970-12-01), Maeda
patent: 4198876 (1980-04-01), Nagano
patent: 4259880 (1981-04-01), Ueno
patent: 4439172 (1984-03-01), Segawa
patent: 4598608 (1986-07-01), Ueno
patent: 4642075 (1987-02-01), Nagashima
patent: 4741724 (1988-05-01), Wang

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