Apparatus for changing gear ratio in bicycles, especially in rac

Details Apparatus for changing gear ratio in bicycles, especially in rac Apparatus for changing gear ratio in bicycles, especially in rac

1998-09-08

2000-02-08

Graysay, Tamara L.

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 83, 474122, F16H 900, F16H 722

Patent

active

060222840

ABSTRACT:
Apparatus for changing bicycle gear ratios comprising pedals (1) to the shaft (3) of which a group of coaxial overdrive gears is fixed, with at least an overdrive gear (20) of larger diameter and at least an overdrive gear (2) of smaller diameter; a plurality of sprockets (4) of different diameter, pack-like disposed close to each other and mounted on the shaft (40) of the rear wheel; a roller chain for the transmission of motion from one of the overdrive gears (2; 20) to one of the sprockets (4); a mechanism for shifting the chain (5) from one to another of said sprockets (4), with a cyclist-operated lever-and-wire driving mechanism; and a mechanism for guiding the deviation of the chain (5) from one to the other of the overdrive gears (2; 20) in cooperation with the mechanism for shifting the chain (5) over the sprockets (4) of the rear wheel. The teeth of each overdrive gear exhibiting, in correspondence of a respective sector (M, N), reduced height and thickness with respect to the other teeth. The sectors (M, N) being angularly offset.

REFERENCES:
patent: 5358451 (1994-10-01), Lacombe et al.
patent: 5466194 (1995-11-01), Steinberg et al.
patent: 5618241 (1997-04-01), Ose
patent: 5876296 (1999-03-01), Hsu et al.

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