Three-stage speed change front derailleur

Details Three-stage speed change front derailleur Three-stage speed change front derailleur

1985-03-22

1986-08-05

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 700

Patent

active

046040781

ABSTRACT:
A three-stage speed change front derailleur which shifts a driving chain to one of three front chain gears of different diameter to thereby change the speed includes a linkage mechanism comprising a fixing member, a pair of linkage members and a movable member provided with an inner guide plate and an outer guide plate, the movable member pivotally supporting a shift plate which is positioned below the inner guide plate, and which serves to shift the chain from a smaller diameter chain gear to a middle diameter chain gear, and is pivoted to the movable member in relation of being movable away from a larger diameter chain gear.

REFERENCES:
patent: 4078444 (1978-03-01), Huret
patent: 4424048 (1984-01-01), Shimano
patent: 4452593 (1984-06-01), Coue

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