Bicycle front derailleur

Details Bicycle front derailleur Bicycle front derailleur

1986-01-08

1987-06-23

Leppink, James A.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

F16H 906

Patent

active

046749950

ABSTRACT:
A front bicycle derailleur for shifting a drive chain on a front gear including a smallest sprocket, an intermediate sprocket, and a largest sprocket, comprising a pair of parallel inner and outer guide plates opposed to each other with the drive chain interposed therebetween at a part positioned in a path of movement of the drive chain toward the front gear, and a control mechanism for laterally translating the guide plates to shift up and down the drive chain on the front gear, wherein the inner guide plate provides a first portion pressing the chain for shifting it from the smallest sprocket to the intermediate sprocket and a second portion pressing the chain for shifting it from the intermediate sprocket to the largest sprocket, the second chain pressing portion being positioned outside of an arc of an imaginary circle concentric with the sprockets of the gear and which arc passes through the first chain pressing portion.

REFERENCES:
patent: 4194409 (1980-03-01), Nagano
patent: 4199974 (1980-04-01), Isobe
patent: 4199998 (1980-04-01), Isobe
patent: 4223562 (1980-09-01), Nagano et al.
patent: 4362522 (1982-12-01), Huret
patent: 4516961 (1985-05-01), Coue474 80

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