French Patent # 785,015 - BGA

French Patent 785,015 - BGA Velectrik main image

This is the first of two patents covering Claudius Blanchard’s BGA Velectrik derailleur (see also French patent # 785,015 Addition 47,985).

One interesting feature of this simple, rod operated, mechanism is that, as the pulley cage is moved inwards a simple angled slot in its bracket also moves it forward - tracking the profile of the freewheel in a simple way. All very simple - but possibly effective.

As an aside, it’s impressive that the St-Étienne patent office was still open at 17:58 on the 1st of February 1935 - a Friday. It seems unlikely that Friday was late opening night, so perhaps those long, lazy, lunch hours necessitated later closing.

Browse associated derailleurs.

BGA Velectrik thumbnail