Automatic variable speed transmission

Endless belt power transmission systems or components – Pulley with expansible rim means or pulleys with alternately... – Structure for variably adjusting radius of rim section

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474 49, B62M 908

Patent

active

046420703

ABSTRACT:
A multi speed transmission mechanism for use on a bicycle, for example, wherein pressure on the pedal by the operator decreases or increases the diameter of the driver sprocket wheel to alter the gear ratio correspondingly. The sprocket is provided with opposed segments which are linked to both the sprocket wheel and an inner control disc. The segments move radially outwardly or inwardly in unison responsive to limited rotation of the control disc independently of rotation of the sprocket. Such rotation is foot controlled by the operator. Pressure on the foot pedal by the operator increases or decreases the working length of the bicycle sprocket chain by making the effective diameter of the sprocket smaller or larger. This alters the gear ratio correspondingly. The gear ratio may be maintained without change by a locking device on the sprocket wheel in contact with the control disc.

REFERENCES:
patent: 2421368 (1947-06-01), Aubert
patent: 2584447 (1952-02-01), Hayot
patent: 2603978 (1952-07-01), Gaisset
patent: 3230788 (1966-01-01), Henley
patent: 3798989 (1974-03-01), Hunt
patent: 3969948 (1976-07-01), Pipenhagen
patent: 3995508 (1976-12-01), Newell
patent: 4164153 (1979-08-01), Moritsch et al.
patent: 4493678 (1985-01-01), Husted
patent: 4521207 (1985-06-01), Husted
Scott, "Automatic Bike Transmission", Popular Science, Nov. 1980, pp. 82-83.

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