Bicycle derailleur

Details Bicycle derailleur Bicycle derailleur

1995-02-06

1996-07-09

Buiz, Michael Powell

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

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

F16H 906

Patent

active

055339379

ABSTRACT:
A rear derailleur (50) is provided with an arcuate cable entraining surface (78) which substantially reduces the variation and magnitude of the actuation ratio between control cable linear displacement and movement of the derailleur p-knuckle (88). A b-knuckle flange (160) militates against the derailment of the drive chain from the upper guide wheel while permitting maximum lateral flexing of the drive chain (48) during shifting between sprockets (46) on the freewheel. A rigid arcuate surface (174) may be provided as an extension of the b-knuckle (170) in replacement of a segment of a Bowden cable housing (38) to obviate the accumulation of water and foreign matter.

REFERENCES:
patent: 4842568 (1989-06-01), Marchigiano
patent: 5380253 (1995-01-01), Iwasaki
patent: 5421786 (1995-06-01), Ando
Exhibits I-X, photographs of Sun Tour S-1 rear derailleur, known to exist since at least 1991, public use and sale.
Exhibit XI, photographs of Sun Tour VX rear derailleur, known to exist since at least 1985, public use and sale.
Exhibit XII, photograph of Campagnolo rear derailleur, known to exist since at least 1989, public use and sale.

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