Safety device for hydraulic brake systems

Claim 1

A SAFETY DEVICE FOR A HYDRAULIC BRAKE SYSTEM INCLUDING PRESSURE APPLYING MEANS ADAPTED TO CONTROL THE PRESSURE IN A FLUID COMMUNICATIVE WITH PRESSURE-ACTUATED BRAKE MEANS, COMPRISING; (A) A HOUSING; (B) A PISTON MOVABLE IN SAID HOUSING AND ADAPTED TO SEPARATE FLUID DISPOSED IN SAID HOUSING INTO FIRST AND SECOND BODIES, RESPECTIVELY COMMUNICATIVE WITH THE FLUID IN SAID PRESSURE APPLYING MEANS AND SAID BRAKE MEANS, SAID PISTON BEING MOVABLE IN SAID FLUID ONLY IN RESPONSE TO MAJOR PRESSURE DIFFERENTIALS ACROSS SAID PISTON; (C) FIRST VALVE MEANS PROVIDED IN A FIRST PASSAGE EXTENDING THROUGH SAID PISTON BETWEEN SAID FIRST AND SECOND FLUID BODIES, SAID VALVE MEANS BEING ADAPTED TO OPEN IN RESPONSE TO A MINOR PRESSURE EXCESS IN SAID FIRST BODY WITH RESPECT TO SAID SECOND BODY; (D) MEANS ADAPTED TO BLOCK SAID FIRST PASSAGE WHEN SAID PISTON IS MOVED IN RESPONSE TO A MAJOR PRESSURE EXCESS IN SAID FIRST BODY WITH RESPECT TO SAID SECOND BODY; (E) SECOND VALVE MEANS PROVIDED IN A SECOND PASSAGE EXTENDING THROUGH SAID PISTON BETWEEN SAID FIRST AND SECOND FLUID BODIES, SAID SECOND VALVE MEANS BEING ADAPTED TO OPEN IN RESPONSE TO A PRESSURE EXCESS IN SAID SECOND FLUID BODY WITH RESPECT TO SAID FIRST BODY, AND (F) MEANS ADAPTED TO OPEN SAID FIRST PASSAGE AFTER IT HAS BEEN BLOCKED BY SAID BLOCKING MEANS DUE TO SAID MOVEMENT OF SAID PISTON.