Indexed gear-shift mechanism

Details Indexed gear-shift mechanism Indexed gear-shift mechanism

1991-12-03

1993-03-09

Bonck, Rodney H.

Machine element or mechanism

Control lever and linkage systems

Hand operated

74475, B60K 2000

Patent

active

051918072

ABSTRACT:
An indexed gear-shift mechanism for a bicycle that has one lever for up-shifting and another lever for down-shifting. A ratchet wheel is fixed to the down-shifting lever and has two rows of teeth along an outer curvature thereof. A pair of pawls are placed on the up-shifting lever and works in conjunction with the two rows of teeth. A pair of springs respectively apply force on the levers in a counterclockwise direction. When a rider applies a force on the up-shifting lever in a clockwise direction, the pawls move to a next adjacent pair of teeth, one pawl preventing rotation of the lever and the other pawls preventing rotation of the ratchet wheel; the bicycle is in a higher gear. When a rider applies a force on the down-shifting lever in a clockwise direction, the pawls move to a previous adjacent pair of teeth, but the pawls do not prohibit movement of the down-shifting lever; therefore, the ratchet wheel may be down-shifted through as many gears as desired in one action.

REFERENCES:
patent: 4864885 (1989-09-01), Nagano
patent: 4936160 (1990-06-01), Barnard et al.
patent: 5012692 (1991-05-01), Nagano
patent: 5044213 (1991-09-01), Nagano
patent: 5094120 (1992-03-01), Tagawa

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