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
1985-06-21
1986-10-28
Leppink, James A.
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 80, F16H 900
Patent
active
046196331
ABSTRACT:
A bicycle derailleur which includes a linkage mechanism formed of a base member, two linkage members and a movable member carrying a chain guide. A swingable member is pivotally supported to one of two opposite members of the linkage mechanism. A return spring is supported to the other of these two opposite members and a first leg of the return spring is retained to the swingable member, while a second leg thereof is retained to the other of the aforesaid two opposite members of the linkage mechanism. A control wire is pulled to move the movable member in a forward direction with respect to the base member and the return spring restores the movable member to a rest position, thereby changing the bicycle speed. A variation in an angle of torsion of the spring is reduced with respect to a variation in the forward stroke of the movable member, whereby operating forces at the top gear side and the low gear side of the multistage gear assembly are substantially equalized to each other.
REFERENCES:
patent: 4437848 (1984-03-01), Shimano
Leppink James A.
McKenzie Frank
Shimano Industrial Company Limited
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