Multi-stage sprocket assembly for bicycle

Details Multi-stage sprocket assembly for bicycle Multi-stage sprocket assembly for bicycle

1991-02-26

1993-03-09

Britts, Ramon S.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

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

474164, F16H 5530

Patent

active

051922495

ABSTRACT:
A multi-stage sprocket assembly for a bicycle is disclosed. In the assembly, a concave portion is provided in a small-sprocket-side face of a large sprocket for avoiding interference with a drive chain disengaged from a height-reduced tooth of the large sprocket, such that a link-connecting portion of the chain is received at a dedendum or a stepped portion of the large sprocket. Teeth of the small sprocket is phase-arranged with the receiving portion of the large sprocket such that a portion of the chain extending substantially straight rearwardly in a drive rotation direction of the sprocket assembly from the link-connecting portion of the chain received by the receiving portion of the large sprocket is engageable with a tooth of the small sprocket. The stepped portion receives the link-connecting portion at a position lower than the dedendum.

REFERENCES:
patent: 3956943 (1976-05-01), Yamasaki
patent: 4348200 (1982-09-01), Terada
patent: 4773893 (1988-09-01), Su et al.
patent: 4889521 (1989-12-01), Nagano
patent: 5066264 (1991-11-01), Romano
patent: 5085620 (1992-02-01), Nagano
patent: 5085621 (1992-02-01), Nagano
patent: 5087226 (1992-02-01), Nagano

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