Automatic gearshifting device of multi-stage fly wheel of bicycle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 18, 2000
Grant Date -
N/A
app pub date -
Jun 17, 1998
filing date -
Jun 17, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic gearshifting device of a bicycle multi-stage fly wheel is composed of a main body, a rotary shaft, an urging member, a plurality of weights located in a receiving cell of the main body, and a drive chain guiding mechanism. The rotary shaft is fastened pivotally with the main body. The urging member is slidably mounted on the rotary shaft such that the urging member is capable of being actuated by the centrifugal force of the weights in motion to slide in the direction of the longitudinal axis of the rotary shaft so as to enable the drive chain guiding mechanism to shift the drive chain from one tooth to another tooth of the bicycle multi-stage fly wheel gear cluster.
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