Retractable/extendable crank using a cylindrical cam, an end cam, or a swash plate cam, and bicycle using the same
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United States of America Patent
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Dec 11, 2012
Grant Date -
May 26, 2011
app pub date -
Jul 2, 2009
filing date -
Jul 18, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a mechanical element, and more particularly, to a crank connected to a bicycle pedal or a handle for rotating a rotary body and to a bicycle using the same. The present invention uses a cylindrical cam, an end cam, or a swash plate cam, and the shafts of these cams and a shaft of a pedal or a handle for applying force are equipped with a miter gear (a bevel gear the number of teeth of which is 1:1 and the shaft angle of which is 90 degrees), such that the crank retracts/extends one time per one rotation of the pedal or the handle.
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