Like the Huret Route Touriste, the Huret Course Compétition was one of Huret’s typically innovative and cunning designs, in this case a racing model that attached at the drop-out.
The pulley cage slides along a rod that is held in place by two thick rods (these are often refered to as ‘piano wire’ designs). A strong torsion spring pushes the cage towards low gear, with the cable running directly between the thick wires and a clamp bolt attached to the torsion spring.
It was all very direct and simple, used materials that could be obtained immediately after the end of the Second World War and could be manufactured in Huret’s simple workshops.
I think that this is a relatively early example of the Huret Course Compétition. Some key features may be:
This example is one of two very similar derailleurs in this collection. The difference between them appears to lie in the composition of the alloy used for the outer pulley cage plate.
If you click on the 'photos' tab and scroll to the bottom, you can see some photos of the double lever and sprung cable that are used to 'detension' the derailleur.