Front derailleur

US8439779B2 · kind B2 · utility

Assignee

• SRAM DEUTSCHLAND GmbH · DE

Inventor

• Raymond Florczyk · Schweinfurt, DE

Key dates

• Filing date: Oct 25, 2006
• Grant date: May 14, 2013
• Expiry date: Oct 7, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62M9/135
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A front derailleur that includes a derailleur housing having a tubular clamp and a chain guide coupled to parallelogram arms. A pivotal transfer element transfers the shifting motion through a pull cable to the chain guide. The shifting momentum is supported by a derailleur housing having a support extension extending in a support direction along the bicycle frame beyond the hinge of the tubular clamp. The transfer element is pivotally mounted to the derailleur housing by a pivot pin. The return spring is disposed around the pivot pin and is supported on a spring stop of the derailleur housing. The return spring is partially surrounded by a spring cover, which is integrated into the derailleur housing, all of which is protected from dirt by a second covering. The bores for accepting the adjustment screws, which are inclined relative to the frame tube in order to improve accessibility, are located in the spring cover.