Derailler system

US4343613A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Berndt Leiter · Waigolshausen, DE
• Josef Keller · Schweinfurt, DE
• Kurt Schuller · Schweinfurt, DE
• Ewald Eisend

Key dates

• Filing date: Aug 5, 1980
• Grant date: Aug 10, 1982
• Expiry date: Aug 5, 2000

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62M9/1246
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

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 int…