Electrically operated transmission gear system for bicycles

Details Electrically operated transmission gear system for bicycles Electrically operated transmission gear system for bicycles

1982-05-21

1984-12-25

Braun, Leslie A.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Tension adjuster or shifter driven by electrical or fluid motor

280236, 3644241, 474 71, F16H 722

Patent

active

044901275

ABSTRACT:
An electrically operated transmission gear system for a bicycle includes a plurality of transmission gears selectively drivable by an endless chain trained around a pedal-driven crank gear, a reversible motor, a takeup reel drivable thereby, and a wire connected at one end to the takeup reel and at the other end to a chain guide for shifting the endless chain into driving mesh with one of the transmission gears at a time. The transmission gear system also includes means for measuring the speed of travel of the bicycle and/or the speed of rotation of the crank gear, means for detecting a transmission ear with which the endless chain is in driving mesh, and an arithmetic unit for deriving a proper speed range from one of the measuring and detecting means and for comparing an output from the other means with the proper speed range as derived to determine whether the transmission gear held in mesh wish the endless chain is proper or not, whereby gear-shifting for the bicycle can properly controlled.

REFERENCES:
patent: 2891411 (1959-06-01), Sutherland et al.
patent: 3182778 (1965-05-01), Droschel
patent: 3688607 (1972-09-01), Marlow
patent: 4143557 (1979-03-01), Wakebe et al.
patent: 4294341 (1981-10-01), Swart

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