Bicycle automatic shift control device with varying shift speeds

Details Bicycle automatic shift control device with varying shift speeds Bicycle automatic shift control device with varying shift speeds

1998-08-27

2000-11-14

Bucci, David A.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

280238, F16H 5900, B62M 900

Patent

active

061462977

ABSTRACT:
An automatic shift control apparatus for a bicycle transmission includes a shift control mechanism for the bicycle transmission and a bicycle speed receiving mechanism for receiving a bicycle speed. The shift control mechanism commands downshifting of the bicycle transmission from a higher speed step to a lower speed step in response to the bicycle speed and commands upshifting of the bicycle transmission from the lower speed step to the higher speed step in response to the bicycle speed. The shift control mechanism commands the bicycle transmission to shift from the lower speed step to the higher speed step at a first bicycle speed, commands the bicycle transmission to shift from the higher speed step to the lower speed step at a second bicycle speed lower than the first bicycle speed if the bicycle speed does not exceed a third bicycle speed higher than the first bicycle speed after shifting from the lower speed step to the higher speed step, and commands the bicycle transmission to shift from the higher speed step to the lower speed step at a fourth bicycle speed between the first bicycle speed and the third bicycle speed if the bicycle speed exceeds the third bicycle speed after shifting from the lower speed step to the higher speed step. Alternatively, the shift control mechanism commands the bicycle transmission to shift from the higher speed step to the lower speed step at a first bicycle speed, commands the bicycle transmission to shift from the lower speed step to the higher speed step at a second bicycle speed higher than the first bicycle speed if the bicycle speed does not fall below a third bicycle speed lower than the first bicycle speed after shifting from the higher speed step to the lower speed step, and commands the bicycle transmission to shift from the lower speed step to the higher speed step at a fourth bicycle speed between the first bicycle speed and the third bicycle speed if the bicycle speed falls below the third bicycle speed after shifting from the higher speed step to the lower speed step.

REFERENCES:
patent: 5213548 (1993-05-01), Colbert et al.
patent: 5261858 (1993-11-01), Browning
patent: 5266065 (1993-11-01), Ancarani Restelli
patent: 5483137 (1996-01-01), Fey et al.
patent: 5514041 (1996-05-01), Hsu
patent: 5621382 (1997-04-01), Yamamoto
patent: 5681234 (1997-10-01), Ethington
patent: 5865454 (1999-02-01), Campagnolo

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