Abstract: The invention relates to a step by step motor and/or brake device through controlled translation, comprising two assemblies arranged substantially coaxially about the same shaft, one of them being slidable along said shaft, and the other assembly being rotatable about said shaft.The device according to the invention may be used in mechanical, pneumatic or electrical equipments, in automatic arrangements, in servo-controls, as modifiable drives, step by step motors, step by step brakes.

Abstract: The pneumatic logic circuit is of generally symmetrical structure around an axis and symmetrical with respect to a median plane normal to this axis. It has a median plate provided with an axial passage and with a duct opening into this passage. On each side of the median plane is a diaphragm constituted by a flat sheet of rubber or of synthetic elastomer with, on its outer surface, a centering shoulder and with an axial cylindrical passage. It comprises axially a piston rod, passing freely through said passage of the median plate and with fluid-tightness through said passages of the diaphragm and bearing two pistons.