Safety device for hydraulic brake system

Claim 1

A SAFETY DEVICE FOR FLUID PRESSURE OPERATED SYSTEMS OF THE TYPE HAVING AN OPERATING MASTER CYLINDER UNIT CONNECTED TO A PAIR OF OPERATED CYLINDER UNITS BY A PULSATOR UNIT INTERPOSED THEREBETWEEN; SAID PULSATOR UNIT COMPRISING A BODY HAVING AN ELONGATED BORE WHOSE CENTRAL PORTION CONSTITUTES AN ACTUATOR CHAMBER AND WHOSE OUTER ENDS ARE CLOSED BY END WALLS AND CONSTITUTES PULSATOR CHAMBERS EACH COMMUNICATING WITH SAID ACTUATOR CHAMBER AND AN OPERATED CYLINDER UNIT, A PAIR OF PLUNGERS EACH RECIPROCATABLE IN SAID BORE AND EACH HAVING ITS INNER AND OUTER ENDS RESPECTIVELY DISPOSED IN SAID ACTUATOR CHAMBER AND A PULSATOR CHAMBER, MEANS ESTABLISHING COMMUNICATION BETWEEN SAID MASTER CYLINDER UNIT AND SAID ACTUATOR CHAMBER, EACH END WALL HAVING AN OPENING THEREIN BY WHICH THE ASSOCIATED PULSATOR CHAMBER IS PLACED IN COMMUNICATION WITH AN OPERATED CYLINDER UNIT, EACH PLUNGER HAVING A VALVE MEMBER UPON ITS OUTER END ENGAGEABLE IN SAID OPENING OF THE ASSOCIATED END WALL IN SEALING ENGAGEMENT AND BLOCKING FLUID FLOW THROUGH THE LATTER, LATCH MEANS ON EACH PLUNGER AND ITS ASSOCIATED END WALL RETAINING SAID VALVE MEANS IN SEALING ENGAGEMENT IN SAID OPENINGS, BLEED PASSAGE MEANS EXTENDING BETWEEN THE OPPOSITE ENDS OF EACH PLUNGER AND WITH ITS ENDS RESPECTIVELY OPENING INTO SAID ACTUATOR CHAMBER AND THE ASSOCIATED PULSATOR CHAMBER AND ESTABLISHING CONTINUOUS BUT RESTRICTED COMMUNICATION BETWEEN SAID ACTUATOR AND PULSATOR CHAMBERS.