Fichtel & Sachs Ag

Kurt Schuller

Berndt Leiter

Josef Keller

Ewald Eisend

The invention relates to a gear-change device for a multi-ratio gear-change in bicycles or the like. A gear-change lever of the gear-change device is mounted pivotably on a basis part of the gear-change device and is formed in its middle part as winding body for a gear-change draw cable. The middle part of the gear-change lever is provided with detents with which a ratchet pawl is associated which in turn is pivotably mounted to the basic part of the gear-change device. The ratchet pawl is subject to the return force of the stressed gear-change draw cable and may be provided with its own spring element which is effective in the outward pivoting. The gear-change device comprises only very few parts and can be produced at favorable price with no restriction of functional efficiency.

Gear-change device for a multi-ratio gear-change hub for bicycles or the

A derailler system for a bicycle including a sprocket system having a plurality of drive sprockets and a chain for driving a wheel of the bicycle at different speeds with the chain being shifted onto individual drive sprockets by movement of an idler sprocket. A movable carrier member has the idler sprocket rotatably mounted thereon for selectively shifting the chain and a guide system is provided for guiding movement of the carrier member along the path essentially parallel with the axis of the driven wheel. A shifting mechanism for actuating the guide system includes a shift lever enabling shifting of the movable carrier to a plurality of shifting positions corresponding with the drive sprockets and a cam follower member including a cam follower rotatably mounted on a first part of the guide system is arranged to engage a cam member mounted on a second part of the guide system which is movable relative to the first part. The shift lever operates through a transmission mechanism to effect rotation of the cam member relative to the second part in order to move the guide sprocket to any one of a desired plurality of positions. A first spring is connected to urge the cam follower into contact with the cam member thereby to move the movable carrier member along its path of travel whenever the cam plate is rotated and a second spring biasing the cam follower member to a position relative to the first part is also provided with the relative position being defined by a stop member on the cam follower member and by a cooperating counterstop member on the first part of the guide system.

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Schweinfurt, Germany

Kurt Schuller