Hybrid spring for bicycle derailleurs

Details Hybrid spring for bicycle derailleurs Hybrid spring for bicycle derailleurs

1998-01-09

2000-07-25

Bucci, David 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 6300, F16H 700

Patent

active

060931221

ABSTRACT:
A parallelogram link mechanism of a bicycle derailleur has a coil spring tensioned from a first axis of the parallelogram to another axis thereof that is diametrically opposed to the first axis. The coil spring exerts a primary spring force against the rider-supplied derailleur actuation force throughout the actuation range of the derailleur. A secondary member exerts a secondary force throughout a portion of the actuation range of the derailleur, producing a substantially constant resultant actuation force experienced by the rider. The secondary member can take various forms, including an abutment member which selectively abuts the coil spring at an angle to the spring axis; a second spring internal to the first; a member which is attached to spaced-apart coils of the coil spring to limit their linear expansion; and an internal member which limits constriction of a segment of the coil spring inwardly toward the spring axis.

REFERENCES:
patent: 5518456 (1996-05-01), Kojima et al.
patent: 5660407 (1997-08-01), Adams
patent: 5695421 (1997-12-01), Fukuda
patent: 5860880 (1999-01-01), Oka
patent: 5897451 (1999-04-01), Ichida

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