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
1990-11-08
1992-12-15
Britts, Ramon S.
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 5900
Patent
active
051711877
ABSTRACT:
A front derailleur is provided with a first pressing portion having an arc substantially coaxial with the front gears and including a first pressing point where a pressing operation of the chain engaging the small gear is started and a second pressing point where the shifting operation of the chain mounting the intermediate gear is completed when the chain is shifted from the small gear to the intermediate gear. The derailleur is further provided with a second pressing portion positioned radially outwardly of the front gears relative to the first pressing portion for pressing the chain when shifting from the intermediate gear to the large gear. A speed change subsidiary portion is provided between the first pressing portion and the second pressing portion for shifting a pressing operating position from the first pressing portion to the second pressing portion as the shifting operation of the chain proceeds in the second speed change operation, and allowing the chain to incline relative to the front gear in plan view.
REFERENCES:
patent: 3813957 (1974-06-01), Huret et al.
patent: 4551121 (1985-11-01), Nagano
patent: 4586913 (1986-05-01), Nagano
patent: 4674995 (1987-06-01), Iwasaki
patent: 4734083 (1988-03-01), Nagano
patent: 4756704 (1988-07-01), Nagano
patent: 4955849 (1990-09-01), Nagano
patent: 4961720 (1990-10-01), Juy
Britts Ramon S.
Schoeppel Roger J.
Shimano Inc.
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