Land vehicles – Wheeled – Occupant propelled type
Patent
1998-06-30
2000-08-08
Hurley, Kevin
Land vehicles
Wheeled
Occupant propelled type
280250, B62M 112
Patent
active
060990090
ABSTRACT:
A bicycle has separate chain-and-sprocket drive mechanisms for the front and rear wheels. The front wheel drive includes a cross shaft and a pair of crank arms at the ends of the cross shaft, both of which crank arms extend in the same radial direction from the cross shaft. The cross shaft and crank arms serve the dual function of enabling steering the bicycle similarly to conventional handlebars and also driving the chain-and-sprocket mechanism for the front wheel. At the ends of the crank arms, a pair of outwardly-directed diametrically-opposed axles form bearing surfaces for a pair of freely rotatable hand grips. A drive sprocket on the cross shaft is rotated by cranking the hand grips in a continuous 360 degree rotary motion, and through the chain, driving a driven sprocket associated with the front wheel. A clutch is provided to lock the cross shaft in any of a plurality of angular positions to enable the drive to be declutched from a driving relationship with the front wheel and used solely for steering. A first lever system is actuated by sliding one of the hand grips axially to operate the clutch, and a second lever system is actuated through conventional lever and cable means from the other of the hand grips for actuating caliper brakes for both wheels. Inboard hand grips are provided on the cross shaft for steering and for enabling performing the brake operation through the second lever system while steering from the inboard grips.
REFERENCES:
patent: 564099 (1896-07-01), Pritchett
patent: 2533728 (1950-11-01), Gedat et al.
patent: 3193305 (1965-07-01), Hendricks
patent: 4773662 (1988-09-01), Phillips
patent: 5908199 (1999-06-01), Rigato
Hurley Kevin
Weigl William
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