Hydraulic braking system for vehicles

Claim 1

DEVICE FOR USE ON VEHICLES EQUIPPED WITH HYDRAULIC BRAKES AND A HYDRAULIC BRAKING CIRCUIT, THE DEVICE ADAPTED TO VARY THE BRAKING FORCE ON THE VEHICLE WHEELS DEPENDING UPON THE VEHICLE LOAD, CHARACTERIZED BY THE FOLLOWING COMBINATION: (A) A PRESSURE VARYING DEVICE SECURED TO ONE OF AT LEAST TWO VEHICLE MASSES SEPARATED BY A SUSPENSION SYSTEM, THE PRESSURE VARYING DEVICE COMPRISING A CYLINDER AND A PISTON MOVABLE THEREIN WHICH SUBDIVIDES THE CYLINDER INSIDE INTO TWO CHAMBERS TOWARDS WHICH IT EXPOSES FACES DIFFERING IN AREA, SPRING MEANS BIASING THE PISTON IN THE CYLINDER, A NORMALLY OPEN VALVE CONTROLLING INTERCONMUNICATION OF THE SAID TWO CHAMBERS WHICH ARE CONNECTED TO THE MASTER CYLINDER AND BRAKING CIRCUIT OF AT LEAST ONE VEHICLE WHEEL, RESPECTIVELY, AND SAID VALVE INTERCEPTING THE SAID INTERCOMMUNICATION UPON A PREDETERMINED VALUE OF THE PRESSURE TRANSMITTED BY THE MASTER CYLINDER AFTER THE PISTON WHICH IS BIASED BY THE SPRING MEANS HAS STARTED ITS MOVEMENT, (B) EACH PRESSURE VARYING DEVICE HAVING ASSOCIATED THEREWITH MEANS COMPRISING A RESILIENT MEMBER INTERPOSED BETWEEN THE PISTON AND THE OTHER ONE OF THE ABOVE MENTIONED VEHICLE MASSES SEPARATED BY THE SUSPENSION SYSTEM, THE RESILIENT MEMBER FORMING AT LEAST A PART OF THE SPRING MERANS BIASING THE PISTON OF THE PRESSURE VARYING DEVICE, SO THAT THE EFFECT OF THE PRESSURE VARYING DEVICE IS AT LEAST PARTIALLY CONTROLLED BY THE POSITION OF THE TWO VEHICLE MASSES SEPARATED BY THE SUSPENSION AND HENCE BY THE VEHICLE LOAD.