Human drive system using synchronized independent pedals with si

Details Human drive system using synchronized independent pedals with si Human drive system using synchronized independent pedals with si

1996-07-16

1999-05-04

Boehler, Anne Marie

Land vehicles

Wheeled

Occupant propelled type

745942, 280260, 474141, B62M 102

Patent

active

058994777

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.

REFERENCES:
patent: 528145 (1894-10-01), Carr
patent: 591488 (1897-10-01), McMullin
patent: 1217691 (1917-02-01), Bonvicn
patent: 3259398 (1966-07-01), Hattan
patent: 4159652 (1979-07-01), Trammell
patent: 4193324 (1980-03-01), Marc
patent: 4398740 (1983-08-01), Clem
patent: 4816009 (1989-03-01), Philipp
patent: 4865577 (1989-09-01), Freudenstein
patent: 5261294 (1993-11-01), Ticer et al.

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