Load brake proportioning for an automobile vehicle

Claim 1

A BRAKING DEVICE FOR AN AUTOMOBILE VEHICLE COMPRISING A FRONT AXLE AND A REAR AXLE EACH PROVIDED WITH BRAKES, SAID DEVICE COMPRISING A MASTER CYLINDER FOR DRIVING A HYDRAULIC FLUID TO ACTUATE SAID BRAKES, AND PRESSURE-CORRECTING MEANS ASSOCIATED WITH SAID REAR BRAKES SO AS TO TAKE INTO ACCOUNT MORE PRECISELY THE CONDITIONS OF DISTRIBUTION OF LOAD AND OF TRANSFERS OF WEIGHT DURING BRAKING, SAID CORRECTION MEANS COMPRISING: A HOLLOW BODY PIERCED WITH AT LEAST ONE FIRST BORE AND A SECOND BORE, SAID SECOND BORE BEING COAXIAL WITH THE FIRST BUT OF LARGER DIAMETER, AND SAID FIRST BORE TERMINATING OPPOSITE SAID SECOND BORE IN A CONICAL COUPLING SURFACE CONVERGENT IN A DIRECTION OPPOSITE TO SAID SECOND BORE; A PISTON DISPOSED IN SAID BODY IN THE AXIS OF THE FIRST BORE OF SAID BODY AND PROVIDED WITH AN ANNULAR TRANSVERSE GROOVE; AN ANNULAR SEALING JOINT DISPOSED IN SAID GROOVE OF SAID PISTON; MEANS FOR AXIALLY MOVING SAID PISTON IN SAID BODY BETWEEN A FIRST POSITION IN WHICH SAID JOINT IS NOT ENGAGED IN SAID FIRST BORE OF THE BODY, SO THAT SAID BORES COMMUNICATE WITH EACH OTHER, AND A SECOND POSITION IN WHICH SAID JOINT IS ENGAGED IN SAID FIRST BORE WITH A FLUID-TIGHT CONTACT, SO THAT SAID BORES DO NOT COMMUNICATE WITH EACH OTHER; A SECOND PISTON ARRANGED IN SAID HOLLOW BODY, SAID FIRST AND SECOND PISTONS BEING EACH PROVIDED INTERNALLY WITH AT LEAST ONE PASSAGE; A SPRING, AND A CONTROL MEANS, AT LEAST SAID FIRST PISTON COMPRISING AT LEAST TWO BEARING SURFACES OF DIFFERENT DIAMETERS, THE FIRST AND SECOND PISTONS DEFINING WITH SAID HOLLOW BODY, A TRANSFER CHAMBER LOCATION BETWEEN THE TWO BEARING SURFACES OF THE FIRST PISTON AND ONE SIDE OF THE SECOND PISTON, SAID CHAMBER BEING CONNECTED TO THE REAR BRAKES; A PRESSURE-INPUT CHAMBER LOCATED ON THE OTHER SIDE OF SAID SECOND PISTON; AND A CHAMBER IN COMMUNICATION WITH THE ATMOSPHERE LOCATED ON THE SIDE OF THE BEARING SURFACE OF THE FIRST PISTON WHICH HAS THE SMALLER DIAMETER, SAID PASSAGE IN THE FIRST AND SECOND PISTONS CAUSING SAID INTAKE CHAMBER TO COMMUNICATE WITH SAID TRANSFER CHAMBER AND BEING OPEN OR CLOSED, DEPENDING ON THE POSITION OF THE FIRST PISTON; SAID SECOND PISTON BEING ADAPTED TO MOVE UNDER THE ACTIONS OF THE INTAKE PRESSURE AND SAID CONTROL MEANS, THE PRESSURE IN SAID TRANSFER CHAMBER; THE FIRST PISTON BEING SUBJECTED TO THE INTAKE PRESSURE AND TO SAID SPRING, TO ATMOSPHERIC PRESSURE AND TO THE PRESSURE IN SAID TRANSFER CHAMBER.