Land vehicles – Wheeled – Occupant propelled type
Patent
1991-05-07
1993-07-06
Oberleitner, Robert J.
Land vehicles
Wheeled
Occupant propelled type
280261, 74665GE, B62M 102
Patent
active
052247252
ABSTRACT:
A drive apparatus for driving the front wheel of a two-wheeled vehicle, such as a bicycle, including front wheel transmission to transmit drive from the drive sprocket to the front wheel including a first chain drive to transmit drive to a first drive element positioned on the frame of the vehicle adjacent a rotatable front wheel support fork, a second chain drive mounted on the support fork to transmit drive from a second drive element to the front wheel hub and drive coupling to transmit drive from the first to the second drive element, wherein the first and second drive elements are spaced from each other along the direction of the support fork and the drive coupling includes a flexible drive shaft coupled to each drive elements by a drive assembly. The drive assemblies permit the ends of the flexible drive shaft to pivot within predetermined limits in substantially vertical planes to accommodate steering movements and be substantially unstressed even at extreme steering positions in use. The drive apparatus can be easily fitted to existing bicycles and bicycle designs, is inexpensive, efficiently transmits drive to the front wheel while permitting steering movements thereof and can accommodate suspension travel of the front wheel.
REFERENCES:
patent: 4479660 (1984-10-01), Pattison
patent: 4895385 (1990-01-01), Becoat
patent: 5116070 (1992-05-01), Becoat
patent: 5158314 (1992-10-01), Pinos
"If you've got two legs what's the point of hopping everywhere? John Heath Robinson tests the Sunshine Components two wheel drive Yamaha,", Performance Bikes, Feb., 1990, pp.48-53.
"Le Snake Transmission Integrale: Motricite et Felicite", Velo Vert, Jan., 1991, pp. 26-30, with translation.
Boehler Anne Marie
Oberleitner Robert J.
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