Multi-step bicycle transmission sprocket assembly

Details Multi-step bicycle transmission sprocket assembly Multi-step bicycle transmission sprocket assembly

1995-05-31

1996-10-29

Schoeppel, Roger J.

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

055691072

ABSTRACT:
A bicycle multi-step transmission sprocket assembly includes a large sprocket gear, an intermediate sprocket gear, and a small sprocket gear. The intermediate sprocket gear is provided in the top surface of a predetermined tooth with a first recess and is further provided with a chain guiding slot located in the back side of a plurality of adjoining teeth along the reverse revolving direction of the predetermined tooth. The large sprocket gear is provided in the top surface of a predetermined number of teeth thereof with a second recess corresponding in location to the chain guiding slot of the intermediate sprocket gear in the reverse revolving direction. The sprocket chain is capable of shifting from the small sprocket gear to the intermediate sprocket gear with speed, thanks to the first recess and the chain guiding slot of the intermediate sprocket gear. The second recess of the large sprocket gear serves to avert the deflection of the sprocket chain so as to eliminate the mechanical interference of the large sprocket gear by the sprocket chain when a transmission process is in progress.

REFERENCES:
patent: 4889521 (1989-12-01), Nagano
patent: 5162022 (1992-11-01), Kobayasi
patent: 5437582 (1995-08-01), Romano

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