Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...
Patent
1994-01-31
1995-03-14
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 6100
Patent
active
053972732
ABSTRACT:
A rear derailleur for a bicycle comprises a hub axis, a mounting member, a bracket body supported by the mounting member to be pivotal about a first axis extending substantially parallel to the hub axis, and a support member disposed forwardly of the bracket member for supporting a chain guide wheel and a chain tension wheel to be pivotal about a second axis extending substantially parallel to the first axis. The derailleur further comprises a pair of pivot links interconnecting the bracket member and the support member and arranged substantially parallel to a first phantom line extending through the first axis and the second axis as seen in a direction along the hub axis, and first and second tension springs for biasing the bracket member to pivot relative to the bicycle frame and for biasing the chain guide wheel and the chain tension wheel to pivot relative to the support member, respectively, to thereby apply a tension to a chain. The guide wheel is disposed close to a position under the gears such that, with a vertical pivotal movement about the first axis of the support member, the guide wheel is movable toward or away from the gears by a long distance for a pivoting angle of the support member. Further, the guide wheel is pivotal downward about the second axis away from the gears by a long distance for a pivoting angle of the guide wheel.
REFERENCES:
patent: 4599079 (1986-07-01), Chappell
patent: 4637808 (1987-01-01), Nakamura
Patent Abstracts of Japan, vol. 17, No. 580 (M-1500) 21 Oct. 1993 (JP-A-05 170 168).
Buiz Michael Powell
Shimano Inc.
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