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
1991-08-23
1992-04-14
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
051043580
ABSTRACT:
The present invention provides a bicycle front derailleur comprising a base member fixed to the seat tube of a bicycle frame, an inner link member, an outer link member, and a movable member having a chain guide, these members being interconnected by pins to form a parallelogrammatic pantographic link mechanism. The link mechanism is biased by a spring so as to return the movable member toward a smallest sprocket of a multiple chainwheel included in a multi-chainwheel assembly, and is deformed against the spring by a cable for a speed change. The cable is connected to the free end of an actuating arm extending from the upper end of the inner link member toward the outer link member to upwardly pull and pivotally move the actuating arm.
The actuating arm therefore forms no upward projection beyond the link mechanism, while the cable can be made to extend upward to a shift lever over a shortened distance with a reduced number of bent portions.
REFERENCES:
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patent: 4030374 (1977-06-01), Isobe
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patent: 4604078 (1986-08-01), Nagano
patent: 4674995 (1987-06-01), Iwasaki et al.
patent: 4756704 (1988-07-01), Nagano
Britts Ramon S.
Eilberg William H.
Maeda Industries, Ltd.
Schoeppel Roger J.
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