Derailleur for a bicycle

Details Derailleur for a bicycle Derailleur for a bicycle

1985-12-27

1988-03-29

Novosad, Stephen J.

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

047340843

ABSTRACT:
The derailleur includes a linkage mechanism comprising a fixing member fixed to the bicycle frame, a pair of linkage members pivoted to the fixing member, and a movable member carrying a chain guide and pivoted to the linkage members. The linkage mechanism is provided with a displacement structure which elastically biases the linkage mechanism axially of a multistage sprocket assembly when subjected to a force or pressure greater than a normal resistance against speed change, thereby preventing the fixing member and bicycle frame from being plastically deformed as a result of a sudden forceful impact, such as in a collision, hitting a foreign object of if the bicycle falls down.

REFERENCES:
patent: 4051738 (1977-10-01), Dian

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