Safety valve device for fluid pressure operated brake systems

Claim 1

IN A FLUID PRESSURE OPERATED BRAKE SYSTEM INCLUDING INDEPENDENT WHEEL BRAKES AND A FLUID PRESSURE ACTUATOR FOR EACH WHEEL BRAKE, A SAFETY VALVE DEVICE FOR SAID SYSTEM ADAPTED FOR CONNECTION WITH SUPPLY LINES FEEDING SAID ACTUATORS AND ALSO ADAPTED FOR CONNECTION WITH DELIVERY LINES LEADING TO AN EMERGENCY RELAY VALVE ON A FLUID PRESSURE RESERVOIR TANK, SAID SAFETY VALVE DEVICE COMPRISING A TWO PART HOUSING DEFINING A CONICALLY TAPERED SUBSTANTIALLY CLOSED MAIN CHAMBER, A SEPARATOR PLATE DIVIDING SAID CHAMBER AND HAVING A THROUGH ORIFICE AND ABUTTING THE PARTS OF SAID TWO PART HOUSING, SCREW MEANS DETACHABLY INTERCONNECTING THE TWO PART HOUSING AND SEPARATOR PLATE, EXTENSION MEANS ON THE TWO PART HOUSING HAVING FLUID INLET PASSAGES AND FLUID OUTLET CHAMBERS COMMUNICATING WITH THE INLET PASSAGES, SAID TWO PART HOUSING HAVING REDUCED INTERNAL PORTS INTERCONNECTING SAID INLET PASSAGES AND DIVIDED MAIN CHAMBER AND ADAPTED TO DRAW A PARTIAL VACUUM IN EITHER SIDE OF THE MAIN CHAMBER DURING THE FLOW OF FLUID INTO AND THROUGH THE INLET PASSAGES, HEADS DETACHABLY SECURED TO SAID EXTENSION MEANS AND COVERING THE OUTLET CHAMBERS THEREOF AND HAVING OUTLET PASSAGES AND TUBULAR VALVE SEATS PROJECTING INTO THE OUTLET CHAMBERS, SAID TWO PART HOUSING AND SEPARATOR PLATE HAVING OPENINGS FORMED THERETHROUGH IN ALIGNMENT WITH THE VALVE SEATS, THE OPENINGS OF THE TWO PART HOUSING COMMUNICATING WITH THE MAIN CHAMBER AND OUTLET CHAMBERS, AN ACTUATOR ROD MOVABLY MOUNTED WITHIN SAID OPENINGS AND SPANNING THE MAIN CHAMBER AND EXTENDING INTO THE OUTLET CHAMBERS, COMPRESSIBLE VALVE ELEMENTS CARRIED BY THE ENDS OF SAID ROD WITHIN THE OUTLET CHAMBERS AND ENGAGEABLE WITH THE VALVE SEATS TO BLOCK SAID OUTLET PASSAGES OF SAID HEADS, SPRINGS WITHIN THE OUTLET CHAMBERS ENGAGING THE VALVE SEATS AND SERVING TO MAINTAIN THE ACTUATOR ROD IN A NEUTRAL POSITION RELATIVE TO THE VALVE SEATS, ELASTIC DIAPHRAGMS WITHIN THE MAIN CHAMBER ON OPPOSITE SIDES OF THE SEPARATOR PLATE AND SECURED CENTRALLY TO SAID ROD AND HAVING PERIPHERAL EDGE PORTIONS CLAMPED BETWEEN THE TWO PART HOUSING AND SEPARATOR PLATE AND DEFINING WITH THE SEPARATOR PLATE AND THE THROUGH ORIFICE THEREOF A CLOSED FLUID FILLED CHAMBER SEPARATE FROM THE MAIN CHAMBER AND WHOLLY WITHIN THE MAIN CHAMBER, AND SIGNAL LIGHT CIRCUIT CLOSING MEANS CONNECTED WITH SAID ROD AND DIAPHRAGMS WITHIN THE MAIN CHAMBER FOR ENERGIZING SAID CIRCUIT UPON MOVEMENT OF SAID ROD AND DIAPHRAGMS IN EITHER DIRECTION AXIALLY OF THE ROD AND VALVE SEATS.