Control means for self-energized brake systems

Claim 1

A HYDRAULIC BRAKING INSTALLATION, ESPECIALLY FOR AUTOMOBILE VEHICLES, IN WHICH EACH OF THE BRAKES OF A FIRST AXLE HAS A DOUBLE SUPPLY CIRCUIT AND COMPRISES A PRIMARY CHAMBER DEFINED AT LEAST IN PART BY A PRIMARY PISTON, AND A SECONDARY CHAMBER DEFINED AT LEAST IN PART BY A SECONDARY PISTON, SAID PRIMARY AND SECONDARY PISTON BEING ASSOCIATED WITH THE APPLICATION MEMBERS OF THE BRAKE, A MASTER CYLINDER DRIVING EQUAL OR PROPORTIONAL VOLUMES INTO THE PRIMARY CHAMBERS OF THE BRAKES OF SAID FIRST AXLE BY MEANS OF TWO PRIMARY CIRCUITS, THE SECONDARY CHAMBERS OF THE BRAKES OF SAID FIRST AXLE BEING CONNECTED TO A SECONDARY CIRCUIT WHICH IS ADAPTED TO COMMUNICATE WITH A SECONDARY CHAMBER OF SAID MASTER CYLINDER, KNOWN AS THE SECONDARY PRESSURE CHAMBER, SAID SECONDARY PRESSURE CHAMBER COMMUNICATING ON THE ONE HAND WITH THE CHAMBER OF THE MASTER CYLINDER WHICH IS CONNECTED TO THE SECONDARY CIRCUIT, KNOWN AS THE TRANSFER CHAMBER, AND ON THE OTHER HAND WITH THE TWO BRAKES OF A SECOND AXLE FOR THE APPLICATION OF SAID BRAKES, SAID MASTER CYLINDER COMPRISING A PRESSURE STATION HAVING PISTON MEANS WHICH ARE RESPONSIVE TO A COMPARISON OF THE PRESSURE IN SAID SECONDARY PRESSURE CHAMBER WITH THE TWO PRIMARY PRESSURES, SAID PISTON MEANS OF THE PRESSURE STATION OF SAID MASTER CYLINDER BEING CONSTITUTED BY A PLUNGER SUBJECTED ON ONE SIDE TO THE ATMOSHPERIC PRESSURE EXISTING IN A CHAMBER CONNECTED TO A TANK AND TO THE PRESSURE OBTAINING IN TWO CHAMBERS RESPECTIVELY CONNECTED TO TWO PRIMARY CIRCUITS, AND ON THE OTHER SIDE TO THE PRESSURE EXISTING IN SAID SECONDARY PRESSURE CHAMBER, WHILE VALVE IS INTERPOSED BETWEEN THE SECONDARY CIRCUIT OF THE BRAKES OF SAID FIRST AXLE AND SAID SECONDARY PRESSURE CHAMBER.