Bicycle front derailleur

Details Bicycle front derailleur Bicycle front derailleur

1990-09-25

1991-08-06

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...

F16H 906

Patent

active

050373552

ABSTRACT:
The present invention provides a bicycle front derailleur mounted close above a multiple chainwheel for shifting the chain from one sprocket to another of the chainwheel. The derailleur comprises a parallelogrammic linkage mechanism deformably mounted to a seat tube of the bicycle frame, and a chain guide carried by the linkage mechanism. The linkage mechanism is always biased by a return spring in a direction to move the chain guide laterally away from the seat tube. The linkage mechanism includes an inner link and an outer link. The outer link has an upper end formed with an actuating arm extending laterally toward the seat tube for connection to a control cable which is used to pull up the actuating arm for deforming the linkage mechanism against the return spring.

REFERENCES:
patent: 4530678 (1985-07-01), Wechsler
patent: 4604078 (1986-08-01), Nagano
patent: 4675995 (1987-06-01), Iwasaki

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