Automatic bicycle transmission

Machine element or mechanism – Gearing – Toothed gear and recirculated unconnected elements

Patent

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Details

280236, 7423022, 7423023, B62M 906

Patent

active

039699480

ABSTRACT:
An automatically variable speed ratio transmission for a pedal driven vehicle such as a bicycle with a chain and sprockets. A pedal operated chain driving sprocket is capable of having its diameter infinitely variable through a predetermined range. The driving sprocket consists of a plurality of small sprockets journally mounted on bell-crank arms having planar offsets for rotation of the small sprockets in one direction only. The bell-crank arms are pivotally mounted on a disc in a uniform circular pattern therearound. The arms and their small sprockets are arranged and constructed to define the vehicle's driving sprocket. The plurality of bell-crank arms are interconnected with each other and are arranged to be uniformly spring biased in one direction. When external resistance to pedalling increases because of uneven terrain, the plurality of small sprockets move radially inwardly to thus reduce the diameter of the driving sprocket making it easier to pedal the vehicle, and conversely when external resistance to pedalling is reduced the plurality of small sprockets move radially outwardly in unison to immediately increase the diameter of the driving sprocket and thus gain speed with substantially the same effort in pedalling.

REFERENCES:
patent: 522427 (1894-07-01), Leggo
patent: 593285 (1897-11-01), VanEyck
patent: 2584447 (1952-02-01), Hayot
patent: 2827797 (1958-03-01), Bell et al.
patent: 3798989 (1974-03-01), Hunt
patent: 3800613 (1974-04-01), Clark
patent: 3850045 (1974-11-01), Hagen
patent: 3861227 (1975-01-01), Hunt
patent: 3867851 (1975-02-01), Gregory et al.

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