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
1987-04-23
1988-11-01
Bui, Thuy M.
Endless belt power transmission systems or components
Control for variable input to output speed-ratio
Including belt shiftable axially from one to another surface...
474 82, F16H 900
Patent
active
047816570
ABSTRACT:
A front derailleur for a bicycle which includes a linkage mechanism which is formed of a fixing member, a chain guide and a pair of linkage members. Four pivot shafts connect the linkage members with the fixing member and the chain guide and have axes which are slanted forwardly from a perpendicular plane through a center line between the guide plates the fore ends of the pivot shafts are positioned farther than their rear ends from the chain guide. When the linkage mechanism is deformed, the chain guide is moved axially of the multistage front gears and obliguely longitudinally of the bicycle, thereby improving the speed change characteristics and speed control efficiency of the derailleur.
REFERENCES:
patent: 4543078 (1985-09-01), Cole
Bui Thuy M.
Shimano Industrial Company Limited
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