Land vehicles – Wheeled – Occupant propelled type
Patent
1994-07-18
1998-09-22
Boehler, Anne Marie
Land vehicles
Wheeled
Occupant propelled type
280260, B62M 102
Patent
active
058103791
ABSTRACT:
A drive train for a tandem bicycle, in which the riders are positioned one behind the other, comprising a transverse intermediate shaft mounted on the bottom tube of a tandem bicycle between the two standard bottom brackets for the respective riders. Chains driven by the respective riders drive separate sprockets, each having an independent free-wheel driving connections to the intermediate shaft and being smaller than the respective chainring which drives it. The intermediate shaft has one or more relatively small chain rings to drive the rear sprockets of the bicycle. The driven rings of the intermediate shaft are smaller than the respective crossover chainrings so that the intermediate shaft is driven at a higher speed than the respective pedal cadences. So that a given gear ratio variation between largest and smallest drive rings may be achieved with a smaller arithmetic gap between the number of teeth on the drive rings. Ground clearance may be greater that of a conventional tandem bicycle due to use of smaller driven and driving chainrings and elevated positioning of the intermediate shaft. The independent freewheeling of the cranksets allow each rider to independently control the rotational position of his or her crankarms for purposes such as clearing obstacles. The present invention also allows the riders to selectively change the relative rotational orientations of the cranksets to allow, for example, pedalling in full synchronization or 90.degree. out of phase to achieve a smoother application of pedalling force.
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Boehler Anne Marie
Freudenberg Kenton L.
Freudenberg Maxwell C.
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