Chain shifter

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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Details

F16H 5900

Patent

active

054073960

ABSTRACT:
A pedal-force chain-shifting apparatus senses a rider's peak force within each half revolution of a pedal set. A shift-down pedal pressure is set to match a rider's weight, strength and stamina objectives. A displacement mechanism compares the peak force with the pressure setting, and uses a portion of chain energy to actuate derailleur chain-shifting mechanisms to guide chain onto larger rear wheel sprocket size. A digital force-averaging mechanism measures a series of less than full pressure cycles to sense a cycle in which a portion of chain energy pulses the derailleur to shift-up by guiding the chain onto a smaller sprocket. This apparatus replaces need for a bicycle rider to anticipate and select appropriate sprockets at front and rear derailleur apparatus.

REFERENCES:
patent: 4693700 (1987-09-01), Chappell
patent: 5102372 (1992-04-01), Patterson et al.
patent: 5163881 (1992-11-01), Chattin
patent: 5197927 (1993-03-01), Patterson et al.

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