Note the ‘chain catcher’ above the chain stay - to catch the chain when back-pedaling to operate the coaster brake.

• Publisher: US Patent and Trademark Office
• Inventor: Franz Winkler (Fichtel & Sachs)
• Country: USA
• Date: US application filed January 1935, German application filed January 1934
• Derailleur brands: Fichtel & Sachs
• Derailleurs: Fichtel & Sachs 9/a