Pedal crank mechanism comprising a sprocket wheel

US4753127A · kind A · utility

Inventor

• Ernst Baumann · Dudenhofen, DE

Key dates

• Filing date: Aug 7, 1986
• Grant date: Jun 28, 1988
• Expiry date: Aug 7, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2165
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In a pedal crank mechanism at least one curved coupling spring is provided for resiliently coupling the pedal crank and the sprocket wheel and is resiliently backed by at least one backing member carried by the sprocket wheel or by the pedal crank. The curved coupling spring engages the backing member at retaining means which are carried by the sprocket wheel or by the pedal crank, or at a point spaced from said retaining means. From the zone in which said coupling spring is backed by the backing member, the coupling spring extends so as to progressively increase its radial distance from the backing surface of the backing member.