Multistep sprocket wheel device for a bicycle

Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...

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474160, F16H 906

Patent

active

050786539

ABSTRACT:
A multistep sprocket wheel device for a bicycle according to the present invention has at least one large sprocket wheel (1) and one small sprocket wheel (2) disposed adjacent each other. The two sprocket wheels (1, 2) are assembled such that a distance between a first pitch center (01) of one of the teeth on the large sprocket wheel (1) and a second pitch center (02) on the small sprocket wheel (2) adjacent a tangential line of the small sprocket wheel (2) extending rearwardly from the first pitch center (01) with respect to a direction of rotation of the sprocket wheels (1, 2) is substantially a product of a pitch of a chain (3) multiplied by an integer.
The present invention is characterized in that a chain support (12) is provided adjacent the first tooth (11) for receiving a portion of the chain (3) located on a side of the first tooth (11) opposed to the small sprocket wheel (2) when the chain (3) disengages toward the small sprocket wheel (2) from the first tooth (11) and an adjacent tooth arranged forwardly of the first pitch center (01) with respect to the direction of rotation.

REFERENCES:
patent: 3661021 (1972-05-01), Ohshita
patent: 3772932 (1973-11-01), Nagano
patent: 4268259 (1981-05-01), Segawa et al.

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