Derailleur for a bicycle

Details Derailleur for a bicycle Derailleur for a bicycle

1980-11-24

1983-09-27

Braun, Leslie 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 80, F16H 900, F16H 1100

Patent

active

044066430

ABSTRACT:
A derailleur for a bicycle, which is so constructed that a movable member is supported to a base member through two linkage members, a changeover frame having two pulleys carrying thereon a driving chain is pivoted to the movable member, and a tension spring is interposed between the movable member and the changeover frame, so that the tension spring exerts tension on the driving chain, said changeover frame being subjected to resistance against its swinging motion in a direction opposite to the working direction of the tension spring, thereby swinging the changeover frame easily in the direction of working of the changeover frame, while, requiring more force in the reverse direction to the working thereof, thereby making swinging of the changeover frame in the working direction of the tension spring easy and more difficult in the swinging motion direction opposite to the working direction of the spring.

REFERENCES:
patent: 4027542 (1977-06-01), Nagano
patent: 4226131 (1980-10-01), Yamasaki
patent: 4322209 (1982-03-01), Shimano

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