Front derailleur for a bicycle

Details Front derailleur for a bicycle Front derailleur for a bicycle

2007-03-13

2007-03-13

Johnson, Vicky A. (Department: 3682)

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

Reexamination Certificate

active

10612924

ABSTRACT:
The present invention provides a bicycle front derailleur mountable to a seat tube of a bicycle frame for fitting a chain around a selected sprocket of a multiple chainwheel by pushing the chain laterally at a portion thereof advancing into engagement with the chainwheel, the front derailleur comprising: a fixed section fixed to a bicycle frame, a chain guide for contacting a chain to shift the chain, and an actuating arm and a linkage rod disposed between and pivotally connected to the fixed section and the chain guide. In the above construction, the present invention has achieved the intended object of providing an improved bicycle front derailleur capable of reliably effecting a change speed operation with the aid of a sufficient restoring force of the return spring and achieving minimized in operation forces required for various change speeds.

REFERENCES:
patent: 4330137 (1982-05-01), Nagano
patent: 5620384 (1997-04-01), Kojima et al.
patent: 5624336 (1997-04-01), Kojima
patent: 5779580 (1998-07-01), White et al.
patent: 6695729 (2004-02-01), Ozaki

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