French Patent # 760,855 - Simplex

French Patent 760,855 - Super Simplex main image

The commercial and sporting success of fork type derailleurs such as the Nieddu’s Vittoria Margherita and Oscar Egg’s Super Champion led to a blind panic by French derailleur designers to get a slice of the action. Lucien Juy was no exception, and unleashed a barrage of patents for fork derailleurs and the chain tensioning mechanisms that they required. This is the first of many.