Power assisted bicycle

Details Power assisted bicycle Power assisted bicycle

1997-08-01

2000-09-19

Dickson, Paul N.

Motor vehicles

Special wheel base

Rider propulsion with additional source of power, e.g.,...

180291, B62K 1100

Patent

active

061198013

ABSTRACT:
Several embodiments of prime mover-assisted pedal-operated vehicles, such as a bicycle. In each embodiment, both the prime mover and the pedal mechanism drive the rear wheel through a common transfer shaft. The transfer shaft is disposed vertically above the pedal-operated crankshaft axis so as to improve the ground clearance and simplify the overall construction of the bicycle. The transmission arrangement is such that the prime mover transmission ratios are always in a step-down condition while the pedal-operated crankshaft drives the transfer shaft through a step-up transmission. Various embodiments of improved torque sensors are also employed so as to provide smooth transition and smooth feel to the rider.

REFERENCES:
patent: 4026375 (1977-05-01), Miura
patent: 4140195 (1979-02-01), Watanabe et al.
patent: 4280581 (1981-07-01), Rudwick
patent: 5242335 (1993-09-01), Kutter
patent: 5361863 (1994-11-01), Goodwin
patent: 5758736 (1998-06-01), Yamauchi
patent: 5909781 (1999-06-01), Yonekawa et al.
patent: 5915493 (1999-06-01), Nakayama
patent: 5924511 (1999-07-01), Takata
patent: 5937962 (1999-08-01), Tokoyama

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