Multiple sprocket chainwheel for bicycle derailleur

US5522611A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Frank Schmidt · Langenselbold, DE
• Andreas Neuer · Schweinfurt, DE
• Gerhard Dumbser · Bitburg, DE
• Jorg Bodmer · Schweinfurt, DE

Key dates

• Filing date: Jan 18, 1995
• Grant date: Jun 4, 1996
• Expiry date: Jan 18, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62M9/10
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A multiple sprocket chainwheel for bicycle derailleurs to drive a hub bushing on the rear wheel by means of at least two sprockets which have different numbers of teeth, and which are located non-rotationally on a chainwheel bushing, whereby spacing connecting rings with bearings and a drive bushing are located between the sprockets, which drive bushing is driven in the driving direction by the chainwheel bushing by means of a freewheel mechanism, whereby the connecting rings have clamping projections which can be inserted into clamping points on the sprockets, which makes possible it possible to have an alternating arrangement in series of a sprocket, a connecting ring, a sprocket, a connecting ring etc. The desired position of one sprocket in relation to another is achieved when a guide tooth on the inside diameter of the one sprocket coincides with the guide tooth on another sprocket. A packet of sprockets combined in this manner has an axially continuous guide tooth which, when located in a longitudinal groove on the circumference of the drive bushing, guarantees the angular position of each part slid onto the drive bushing. The multiple sprocket chainwheel, which can be modifi…