Self-contained change speed apparatus with shaped pawls to equal

Details Self-contained change speed apparatus with shaped pawls to equal Self-contained change speed apparatus with shaped pawls to equal

1993-08-30

1994-06-21

Braun, Leslie A.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural drive ratios other than unity

192 6A, 192 47, 1924829, 192 64, F16H 374, F16H 5710

Patent

active

053224876

ABSTRACT:
A self-contained change speed apparatus for use on a bicycle having a fixed shaft, a drive member and a hub body rotatably supported on the fixed shaft, and a change speed device disposed between the drive member and hub body. The change speed device includes a plurality of clutches and a clutch controller. The clutches are subjected to a resistance to disengagement corresponding to a drive torque. The clutch controller includes a shiftable first control member, a spring for storing a shift of the first control member as energy, and a shiftable second control member operable by the spring for operating the clutches. The second control member shifts to disengage the clutches when the first control member shifts and the spring imparts a force greater than the resistance to disengagement for shifting the second control member. The second control member remains stationary when the first control member shifts and the spring imparts a force less than the resistance to disengagement, the second control member being shiftable to disengage the clutches only when the force of the spring exceeds the resistance to disengagement. The clutches are shaped and arranged such that forces for overcoming the resistance to disengagement are substantially the same for all of the clutches.

REFERENCES:
patent: 3432013 (1969-03-01), Matsumoto
patent: 4437552 (1984-03-01), Toyama
patent: 4702486 (1987-10-01), Tsuchie
patent: 4721013 (1988-01-01), Steuer er al.
patent: 4973297 (1990-11-01), Bergles
patent: 5078664 (1992-01-01), Nagano

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