1938: The definitive Incabloc
Despite the success of the 1933 Incabloc, Fritz Marti went on with his research, registering two more patents in 1937. These kept Porte-Echappement Universel SA (Portescap) ahead of its competitors.
Increasing demand led to a need for interchangeable parts. Accordingly, the new Incabloc came out with a double cone system. As Georges Braunschweig explained: “We reckoned we could achieve [interchangeability] more easily if instead of adjusting two centering surfaces that touch in the middle of the Incabloc, we have two conical centering surfaces that are as far apart as possible, in other words at either end of the bearing.”
The spring was also re-assessed, since it could easily be lost when removed or replaced. Porte-Echappement Universel SA therefore developed a spring that remained fixed to the block; its lyre shape was to become the symbol of Incabloc itself.