Rear derailleur for a bicycle

Details Rear derailleur for a bicycle Rear derailleur for a bicycle

1985-11-19

1987-01-20

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...

474 82, F16H 900

Patent

active

046378090

ABSTRACT:
A rear derailleur for a bicycle having a linkage mechanism supported swingably to a fixing member through a first horizontal shaft, a first spring interposed between the linkage mechanism and the fixing member, and a second spring interposed between a movable member at the linkage mechanism and a chain guide, so that the first and second springs balance with each other to allow the linkage mechanism and chain guide to swing, thereby controlling a guide pulley at the chain guide in position with respect to each sprocket at the multistage sprocket assembly. Hence, even when the position to support an operating wire for the linkage mechanism during the swinging motion thereof varies to vary the position of the guide pulley with respect to the multistage sprocket assembly, an interval between the chain and the urging surface therefor is held constant.

REFERENCES:
patent: 4384864 (1983-05-01), Bonnard
patent: 4530677 (1985-07-01), Nagano

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