French Patent # 760,762 - Laval

French Patent 760,762 - Laval main image

This is Adolphe André Laval's patent for his Laval Poiplum fork-type derailleur.

Note that:

  • Adolphe André Laval made his patent application only 7 months after Oscar Egg applied for his first patent for a Super Champion fork-type design.
  • The chain tensioning arm can be unlocked and relocked using a secondary lever.