Bicycle front derailleur

Details Bicycle front derailleur Bicycle front derailleur

2004-08-30

2008-10-21

Siconolfi, Robert A. (Department: 3683)

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

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

C474S078000, C474S080000, C474S122000, C474S127000

Reexamination Certificate

active

07438658

ABSTRACT:
A bicycle front derailleur includes a chain guide that is provided with a pushing element that is movable relative to the chain guide to assist in shifting a bicycle chain from a smaller front sprocket to an adjacent larger sprocket. The chain guide is part of a movable member that is movably coupled to a base member via a linkage assembly. The pushing element has a contact surface that preferably moves both laterally outwardly and longitudinally as the pushing element moves from a first position to a second position. Preferably, the pushing element is chain activated and arranged to move at least laterally outwardly by contacting a chain that is moving between inner and outer chain guide members of the movable member. Preferably, the pushing element is either a slidable member or a rotatable member.

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patent: 2004/0130120 (2004-07-01), Matsumoto et al.
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patent: 2 621 373 (1989-04-01), None
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