Speed-change gear mounted outside a bicycle

Details Speed-change gear mounted outside a bicycle Speed-change gear mounted outside a bicycle

1980-12-16

1984-04-17

Staab, Lawrence J.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

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

474 80, F16H 1108

Patent

active

044432089

ABSTRACT:
The disclosed speed-change gear includes a fitting secured to the frame of a bicycle, a parallel link means having an outside link and an inside link whose one ends are pivotally connected to the fitting, a movable member pivotally connected to the opposite ends of the inside and outside links, a changeover frame rotatably secured to the movable member, which changeover frame carries a guide wheel and a tension wheel of a chain, and a cam means adapted to selectively move said movable member so as to shift the speed-change ratio by changing the position of said changeover frame to shift the chain to the desired step of a multi-step sprocket assembly of the bicycle. The cam means has a spring-biased cam rotatably mounted on a shaft connecting the outside link to the fitting, which cam rotates together with a wire-operated reel coaxially mounted on said shaft. The rotation of the cam actuates said parallel link means through a lever pivotally carried by a shaft connecting the inside link to the fitting.

REFERENCES:
patent: 3973447 (1976-08-01), Nagano
patent: 3979962 (1976-09-01), Kebsch
patent: 4161124 (1979-07-01), Juy
patent: 4185510 (1980-01-01), Juy
patent: 4273546 (1981-06-01), Bergles
patent: 4343613 (1982-08-01), Leiter et al.

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