Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Condition responsive
Patent
1995-08-14
1997-02-04
Schoeppel, Roger J.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
Condition responsive
474 81, 280261, F16H 906
Patent
active
055992447
ABSTRACT:
An automatic speed range shifter for bicycles is disclosed which produces a downshift when a predetermined pedal force is exceeded and which produces an upshift when a predetermined pedal rotational speed is exceeded. A pedal force sensor includes a strain gage element on an arm supporting an idler sprocket for the chain. A pedal rotational speed sensor includes a magnet/coil coacting with the pedal crank. A microcomputer receives inputs from the force and speed sensors and produces control signals for the automatic shifter. The automatic shifter includes a front shifter actuator including a reversible electrical servo motor which is coupled by a cable with the front derailleur. It also includes a rear shifter actuator with a reversible servo motor which is coupled by a cable with the rear derailleur.
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