Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...
Patent
1991-05-24
1992-08-04
Bui, Thuy M.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
Including belt shiftable axially from one to another surface...
474 80, F16H 1108
Patent
active
051354411
ABSTRACT:
A low effort shifter for multispeed bicycles and the like having cable operated derailleurs is provided, comprising a circular spool rotatably mounted in a housing. The derailleur control cable is operatively anchored to the spool so that when the spool is rotated, the derailleur changes position. A force cancellation spring is anchored to the spool so as to counteract and oppose the moment imposed upon the spool by the derailleur bias spring. The force cancellation spring is routed in a circular path around said spool and extends to a linear path into a straight portion of the housing, where the spring is coupled to a preload adjustment screw. The spool has a gear thereon which is engaged with a second gear, the second gean being coupled to a shift knob outside the housing. The shift knob may be selectively operated by the rider using substantially negligible force to effectuate drive ratio changes.
REFERENCES:
patent: 4887990 (1989-12-01), Bonnard et al.
patent: 4900291 (1990-02-01), Patterson
patent: 5033991 (1991-07-01), McLaren
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