This is the second of two patents for derailleurs held by Luigi Magistroni - the famous manufacturer of high quality chainsets.

It shows a rack and pinion type derailleur with a slant action.

I think the story of these two patents may go something like this:

• Tullio Campagnolo, had started out by making quick releases and gear systems. These were complementary to, and often used along with, Magistroni chainsets.
• But by 1961, Campagnolo was making big inroads into the chainset market and was now a major competitor for Magistroni.
• In particular, 1960 saw the introduction of the iconic aluminium, cotterless, Campagnolo Record chainset - which defined the quality chainset market for the next two decades.
• Even more of a danger was Tullio Campagnolo's concept of the 'groupset' - that all the components on a bike should come from one manufacturer. This was a mortal threat to Magistroni.
• Caught in the headlights of this speeding locomotive, perhaps Luigi Magistroni thought that he had to strike back - by manufacturing gear systems and creating a groupset of his own.
• Unfortunately I don't believe that Luigi ever put either of his designs into production.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Luigi Magistroni
• Country: France
• Date: Priority date January 1961
• Derailleur brands: Magistroni
• Derailleurs: unknown