Fluid pressure operated warning device

Claim 1

A FLUID PRESSURE OPERATED WARNIG DEVICE IN COMMUNICATION WITH A PRESSURE SOURCE, COMPRISING A FIRST BODY MEMBER, A SHOULDER WITHIN SAID FIRST BODY MEMBER DIVIDING SAID BODY INTO FIRST AND SECOND COMPARTMENTS COMMUNICATING WITH ONE ANOTHER BY WAY OF A HOLE FORMED BY SAID SHOULDER MEMBER, A SECOND BODY MEMBER COMMUNICATING WITH SAID FLUID PRESSURE SOURCE AND POSITIONED IN SAID FIRST COMPARTMENT, A FIRST CHAMBER HOUSING WITHIN SAID SECOND BODY MEMBER, A BALL VALVE SEATABLE ON SAID HOLE FORMED BY SAID SHOULDER, SPRING MEANS ENGAGING A WALL OF SAID FIRST CHAMBER AND SAID BALL VALVE AND URGING SAID BALL VALVE INTO A SEATING POSITION WITH SAID HOLE, PISTON ASSEMBLY INCLUDING A PISTON, FIEXIBLE SEAL, STOP AND ROD SLIDABLE IN SAID SECOND COMPARTMENT, A SECOND CHAMBER FORMED ON ONE SIDE OF SAID PISTON ADJACENT SAID SHOULDER MEMBER, SAID ROD PASSING THROUGH SAID HOLE FORMED BY SAID SHOULDER AND ENGAGING SAID BALL VALVE, VARIABLE RESILIENT MEANS IN SAID SECOND COMPARTMENT ENGAGING SAID PISTON ASSEMBLY FOR URGING SAID BALL VALVE AWAY FROM SAID HOLE WITH A FORCE EXCEEDING SAID SPRING MEANS AND FLUID PRESSURE ACTING UPON SAID BALL VALVE, WHEN SAID FLUID PRESSURE IS BELOW A PREDETERMINED VALUE, ADJUSTABLE FLOW REGULATING MEANS FOR PERMITING SUBSTANTIALLY CONSTANT FLUID FLOW AT A GIVEN SETTING FROM SAID FIRST CHAMBER TO SAID SECOND CHAMBER, AND MEANS COMMUNICATING WITH SAID SECOND CHAMBER ACTUATED BY SAID FLUID FOR EMITTING NOISE.