In the late 1930s Simplex had dominated the derailleur market with their simple single-pulley models (the Simplex Champion de France and Simplex Champion du Monde were typical examples). This 1940 patent describes Huret's response - a simple, steel, single-pulley derailleur. It's a pretty decent effort - straight-forward, strong and as effective as its competitors.

Unfortunately for Huret, by 1940, the world was at war.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: André Maxime Huret
• Country: France
• Date: French application November 1940
• Derailleur brands: Huret
• Derailleurs: Huret derailleur