Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Condition responsive
Patent
1990-05-08
1991-10-22
Britts, Ramon S.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
Condition responsive
474 80, 474103, 474110, 474116, F16H 6100, B62M 0000
Patent
active
050591584
ABSTRACT:
An electro-mechanical system for shifting gears on a multi-gear bicycle or other human-powered vehicle includes a closed loop derailleur position control system using a circuitry for measuring derailleur position. Shifting gears is accomplished automatically based on rider cadence or manually using signals supplied by hand operated switches. The system calculates gear ratios based on bicycle speed and cadence and then sorts the gear ratio in order from lowest to highest. During automatic operation, the system calculates a cadence from bicycle speed and gear ratio, determines if the calculated cadence is within predetermined limits set by the rider, and it changes the gear ratio if the calculated cadence is not within the predetermined limits. The system has additional modes of operation which include calibration modes for calibrating the positions of the front and rear derailleurs for each gear, as well as a semi-automatic mode in which the system calculates the cadence from the bicycle speed and gear ratio, and signals the rider to upshift or downshift if the cadence is outside of the predetermined limits selected by the rider. The electronic bicycle transmission control system of the present invention is retrofittable to a wide range of conventional multi-gear bicycles.
REFERENCES:
patent: 3919891 (1975-11-01), Stuhlmuller et al.
patent: 4490127 (1984-12-01), Matsumoto et al.
patent: 4605240 (1986-08-01), Clem et al.
Zimmer, C., Easy Rider, Discover Magazine, Aug. 1990, p. 30.
Bellio Stephen
Eidelman Gerald P.
Britts Ramon S.
E.B.T., Inc.
Schoeppel Roger J.
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