Pneumatic fire alarm system

Claim 1

A PNEUMATIC FIRE ALARM SYSTEM COMPRISING, A SOURCE OF PNEUMATIC PRESSURE, A PLURALITY OF ZONE DETECTING CONTROLLERS ADAPTED TO BE POSITIONED RESPECTIVELY IN A PLURALITY OF ZONES IN WHICH FIRE DETECTION IS DESIRED, A PRESSURE REGULATOR ASSOCIATED WITH EACH DETECTING CONTROLLER, MEANS CONNECTING SAID SOURCE OF PNEUMATIC PRESSURE TO SAID PRESSURE REGULATORS AND SAID CONTROLLERS, EACH OF SAID DETECTING CONTROLLERS HAVING A FIRST CHAMBER THEREIN TO WHICH THE RESPECTIVE PRESSURE REGULATOR IS CONNECTED AND ADJUSTED TO SUPPLY THE SAME AT DIFFERING PRESSURES, A SEALED LOOP CONDUIT FOR EACH CONTROLLER CONNECTED RESPECTIVELY AT ITS EXTREMITIES TO SAID CONTROLLER AND BEING PRESSURIZED BY THE PRESSURE IN SAID FIRST CHAMBER, SAID LOOP CONDUITS BEING ADAPTED TO BE DISTRIBUTED RESPECTIVELY WITHIN THE ZONES IN WHICH FIRE DETECTION IS DESIRED, A FIRST ADJUSTABLE RESTRICTION INCLUDED IN EACH CONTROLLER AND VENTING RESPECTIVELY SAID FIRST CHAMBERS TO ATMOSPHERE, A SECOND ADJUSTABLE RESTRICTION INCLUDED IN EACH CONTROLLER AND CONNECTED TO SAID FIRST CHAMBER, A COMMON INDICATOR FOR ALL OF SAID ZONE CONTROLLERS, CONDUIT MEANS CONNECTING ALL OF SAID SECOND RESTRICTIONS THROUGH A COMMON CONDUIT TO SAID INDICATOR, PRESSURE RESPONSIVE MEANS ASSOCIATED WITH SAID FIRST CHAMBER AND INCLUDING A SHAFT IN EACH OF SAID CONTROLLERS, A SECOND CHAMBER IN EACH OF SAID CONTROLLERS, SAID SHAFT IN EACH OF SAID CONTROLLERS EXTENDING INTO SAID SECOND CHAMBERS, VALVE MEANS POSITIONED IN SAID SECOND CHAMBER OF EACH CONTROLLER AND OPERATIVELY CONNECTED TO AND OPERATED BY THE PRESSURE RESPONSIVE MEANS IN SAID FIRST CHAMBER OF EACH CONTROLLER, ADDITIONAL CONDUIT MEANS CONNECTED TO SAID SECOND CHAMBER OF EACH CONTROLLER AND TO SAID SOURCE OF PNEUMATIC PRESSURE INDEPENDENT OF SAID PRESSURE REGULATORS TO PROVIDE AN UNREGULATED HIGHER PRESSURE THEREIN, FURTHER CONDUIT MEANS WITHIN EACH OF SAID CONTROLLERS CONNECTING SAID SECOND CHAMBER WITH SAID FIRST CHAMBER AND INCLUDING A DIRECTIONAL CHECK VALVE, AUDIBLE ALARM MEANS MOUNTED ON EACH OF SAID CONTROLLERS AND CONNECTED TO SAID SECOND CHAMBERS BEING RESPONSIVE TO THE PRESSURE THEREIN VALVED BY SAID VALVED MEANS WITH MOVEMENT OF SAID PRESSURE RESPONSIVE MEANS, SAID FURTHER NAMED CONDUIT MEANS PERMITTING FLOW OF AIR FROM SAID