Machine element or mechanism – Gearing – Toothed gear and recirculated unconnected elements
Patent
1975-07-30
1977-08-16
Scott, Samuel
Machine element or mechanism
Gearing
Toothed gear and recirculated unconnected elements
74242, F16H 722
Patent
active
040417883
ABSTRACT:
A control system for a chain carrier-idler assembly which positions and controls the drive chain shifting from one drive sprocket to another drive sprocket of the multiple sprocket cluster of a derailleur drive rear bicycle wheel mechanism. A chain carrier-idler assembly has its inboard or outboard motion controlled by the positioning of a "floating" gear from a neutral position to an inboard-drive or outboard-drive position. A movable lever arm (driven by a DC motor) carries the floating gear, and also carries a series of electrical contacts which connect and disconnect with contacts on a baseplate parallel to the lever arm, thus to energize or de-energize the motor. Another movable contact (representative of the position of the carrier assembly and drive chain) moves across a series of spaced fixed contacts representative of the location of each sprocket gear. A power source, rocker switch, and connecting circuitry are provided to upshift or downshift the drive chain. The cooperation of the fixed and movable electrical contacts with the drive motor and placement of the floating gear operate to adjust the duration of movement of the carrier assembly to the point where the new sprocket ratio is effectuated, at which moment the floating gear is driven back to neutral. Thus the gear-change operation is stopped automatically upon shift completion. The operator does not have to look or guess when to shut off the gear changing operation.
REFERENCES:
patent: 3863512 (1975-02-01), Crawley
patent: 3919891 (1975-11-01), Stuhlmuller et al.
Burke A. Russell
California Progressive Products, Inc.
Kozak Alfred W.
Scott Samuel
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