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
1983-09-06
1985-09-24
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...
F16H 900
Patent
active
045430780
ABSTRACT:
A fork element 1 for guiding the chain is pivotally mounted by means of a deformable parallelogram structure 11, 12 on a support constituted by an arm 3 which is upwardly and outwardly inclined relative to a vertical plane containing the longitudinal axis of the bicycle. The parallelogram structure is deformed in a plane which is inclined in a direction parallel to said arm. With this arrangement, the fork element is shifted in a constant vertical position in a combined oblique upward and advancing movement so as to shift the chain from a small chain wheel to a larger chain wheel.
REFERENCES:
patent: 3890847 (1975-06-01), Dian
patent: 4362523 (1982-12-01), Huret
Huret et ses Fils
Leppink James A.
McKenzie, Jr. Frank H.
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