Endless belt power transmission systems or components – Belt guide has surface in sliding contact with belt
Patent
1991-08-29
1993-03-09
Bui, Thuy M.
Endless belt power transmission systems or components
Belt guide has surface in sliding contact with belt
474160, F16H 718
Patent
active
051922487
ABSTRACT:
A multi-stage sprocket assembly for a bicycle has a small sprocket, a large sprocket disposed coaxially with the small sprocket and a shift assist projection provided to the large sprocket for assisting a shifting movement of a chain from the small sprocket to the large sprocket. The assembly includes a guide face for guiding an outer side face of link plate of the chain. The guide face is formed in a side face of a second tooth of the large sprocket facing the small sprocket, the second tooth being forwardly adjacent, relative to a moving direction of the chain, a first tooth of the large sprocket which comes into engagement with a leading portion of the shifting chain. The shift assist projection is so displaced toward the small sprocket that the projection comes into engagement with the shifting chain portion at a position forwardly distant from a position of the engagement between the leading end of the shifting chain portion and the first tooth by a distance which is substantially an integer multiple of a disposing pitch of the large sprocket teeth. Also, the shift assist projection has such a radial height as to prevent this projection from extending into a rotary drive-moving path of the chain as fully engaging the large sprocket for propelling the bicycle.
REFERENCES:
patent: 4198876 (1980-04-01), Nagano
patent: 4348200 (1982-09-01), Terada
patent: 4813916 (1989-03-01), Valin
patent: 4960402 (1990-10-01), Klein et al.
patent: 5002520 (1991-03-01), Greenlaw
patent: 5087226 (1992-02-01), Nagano
Bui Thuy M.
Shimano Inc.
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