Bicycle gear shifting method and apparatus

Details Bicycle gear shifting method and apparatus Bicycle gear shifting method and apparatus

1989-01-05

1990-02-13

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...

74488, 745016, F16H 924

Patent

active

049002910

ABSTRACT:
A bicycle derailleur gear shifting system having a rotatable handgrip actuator cam which is coupled with the derailleur shifting mechanism through a control cable system so as to control the derailleur mechanism. Separate actuator cams are associated with the front and rear derailleurs. For the down-shifting direction, at least the rear derailleur cam is configured so as to substantially compensate for increasing force of the derailleur return spring; so as to substantially compensate for numerous cumulative lost motions in the derailleur shifting mechanism and cable system, and for chain gap variations; and so as to overshift the chain a sufficient amount beyond the destination freewheel sprocket so that the chain will approach the destination sprocket in the same direction as it would in the up-shift direction, but not sufficient to cause a double shift, or derailling from the #1 sprocket. A front derailleur cam is configured to provide fine-tuning for "cross-over" riding.

REFERENCES:
patent: 4055093 (1977-10-01), Ross
patent: 4194408 (1980-03-01), Hedrich
patent: 4201095 (1980-05-01), Cirami
patent: 4267744 (1981-05-01), Yamasaki
patent: 4384864 (1983-05-01), Bonnard
patent: 4693700 (1987-09-01), Chappell

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