Brake mechanism

Claim 1

A FLUID PRESSURE SAFETY BRAKE SYSTEM HAVING A RESERVOIR OF FLUID PRESSURE, A FLUID PRESSURE ACTUATOR FOR APPLYING A VEHICLE BRAKE, SPRING-APPLIED BRAKE LOCKING MEANS FOR LOCKING SAID ACTUATOR IN A BRAKE APPLIED POSITION, FLUID PRESSURE OPERATED RELEASE MEANS FOR RELEASING SAID BRAKE LOCKING MEANS, AND MEANS FOR CONTROLLING THE APPLICATION OF FLUID PRESSURE TO AND FROM SAID ACTUATOR AND TO AND FROM SAID RELEASE MEANS COMPRISING, A FIRST VALVE HAVING INLET, OUTLET AND EXHAUST PORTS, SAID EXHAUST PORT BEING CONNECTED AT ALL TIMES WITH THE ATMOSPHERE, A FIRST CONDUIT CONNECTING SAID INLET PORT AND RESERVOIR, A SECOND CONDUIT DIRECTLY CONNECTING SAID OUTLET PORT AND RELEASE MEANS, SAID FIRST VALVE BEING MOVABLE TO ONE POSITION TO CONNECT SAID INLET AND OUTLET PORTS TO APPLY FLUID PRESSURE DIRECTLY FROM SAID RESERVOIR TO SAID RELEASE MEANS AND BEING MOVABLE TO A SECOND POSITION TO DISCONNECT SAID OUTLET PORT FROM THE INLET PORT AND TO CONNECT THE OUTLET PORT WITH THE EXHAUST PORT TO EXHAUST FLUID PRESSURE FROM SAID RELEASE MEANS, A SECOND VALVE MOVABLE TO ONE POSITION TO DIRECTLY CONNECT SAID RESERVOIR AND ACTUATOR AND MOVABLE TO ANOTHER POSITION TO DISCONNECT SAID RESERVOIR FROM THE ACTUATOR AND CONNECT THE LATTER WITH THE ATMOSPHERE, A PRESSURE RESPONSIVE ELEMENT FOR CONTROLLING THE MOVEMENTS OF SAID SECOND VALVE, SAID ELEMENT HAVING A PRESSURE RESPONSIVE PART PROVIDED WITH AN EXHAUST CHAMBER, SAID ELEMENT ALSO HAVING A PLUNGER CONNECTED THEREWITH AND PROVIDED WITH A THROUGH BORE, OPEN AT ONE END AND COMMUNICATING WITH THE EXHAUST CHAMBER AT THE OTHER END, AND A THIRD CONDUIT FOR SUBJECTING SAID PRESSURE RESPONSIVE PART AT ALL TIMES TO THE PRESSURE IN SAID SECOND CONDUIT, AND A BRAKE VALVE CONNECTED WITH SAID ACTUATOR FOR CONTROLLING THE APPLICATION OF FLUID PRESSURE TO AND FROM SAID ACTUATOR.