Bicycle front derailleur
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United States of America Patent
Stats
-
Aug 6, 1991
Grant Date -
N/A
app pub date -
Sep 25, 1990
filing date -
Sep 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a bicycle front derailleur mounted close above a multiple chainwheel for shifting the chain from one sprocket to another of the chainwheel. The derailleur comprises a parallelogrammic linkage mechanism deformably mounted to a seat tube of the bicycle frame, and a chain guide carried by the linkage mechanism. The linkage mechanism is always biased by a return spring in a direction to move the chain guide laterally away from the seat tube. The linkage mechanism includes an inner link and an outer link. The outer link has an upper end formed with an actuating arm extending laterally toward the seat tube for connection to a control cable which is used to pull up the actuating arm for deforming the linkage mechanism against the return spring.
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