French Patent # 743,306 - Simplex

French Patent 743,306 - Simplex main image

Lucien Juy of Simplex, liked to patent everything - his own ideas and any ideas that he thought that any of his competitors might be interested in. This patent shows typical looking Simplex early 1930s derailleur designs - but with crucial differences. The differences involve the derailleur being operated by levers or cogs - both of which were mechanisms used by major competitors.