Human drive system using synchronized independent pedals with sinusoidal type variable efficiency
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United States of America Patent
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May 4, 1999
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N/A
app pub date -
Jul 16, 1996
filing date -
Jul 17, 1995
priority date (Note) -
Expired
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Abstract
A drive mechanism applicable to bicycles for increasing the efficiency of pedaling action via independent pedals with a sinusoidally varying transmission ratio. The drive mechanism achieves increased efficiency by making the pedals independently synchronized with a varying transmission ratio so that the coincidence of both legs in dead centers is avoided when one pedal is in an upper and the other pedal is in a lower position, making the pedal which is going up move more rapidly than the pedal going down. This kinematic is achieved in two possible embodiments: in the first embodiment, two pairs of elliptic gears are used to synchronize the independent pedals, and two eccentric chain wheels, integral with respective pedal rods, are used to transmit power through two parallel corresponding chains towards the rear wheel, while in the second embodiment, the elliptic gears synchronize the kinematics and transmit power from the left pedal rod towards the right pedal rod, integral with the eccentric chain wheel, and from there towards the rear wheel by the corresponding chain.
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