Endless belt power transmission systems or components – Control for variable input to output speed-ratio
Patent
1992-05-20
1993-10-19
Bui, Thuy M.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
474 84, F16H 5900
Patent
active
052540421
ABSTRACT:
A transmission device for a bicycle is provided including a first transmission for obtaining a forward driving force. The first transmission drives a first free wheel in conformity with movement of a first drive unit when a crank shaft is forwardly rotated. A second transmission obtains a forward driving force by converting a direction of the rotating force produced in a rotational direction of a second drive unit. The rotational direction is supplied to a second free wheel under a reverse rotation of the crank shaft. A forward driving force is obtained regardless of the rotational direction of the crank shaft, thereby improving an exercise effect.
REFERENCES:
patent: 3913944 (1975-10-01), Blow, Jr.
patent: 4398740 (1983-08-01), Clem
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