Low pressure alarm assembly

Claim 1

IN A LOW PRESSURE WARNING ALARM COMPRISING A CASING HAVING ONE END ADAPTED FOR CONNECTION TO A SOURCE OF PRESSURIZED FLUIDS AND A LONGITUDINAL PASSAGEWAY THERETHROUGH WHICH COMMUNICATES WITH THE SOURCE, A RECIPROCATING PLUNGER HAVING A FIRST END AND A SECOND END, SAID PLUNGER EXTENDING THROUGH SAID LONGITUDINAL PASSAGEWAY IN SEALING ENGAGEMENT THEREWITH, SPRING MEANS INTERPOSED BETWEEN SAID FIRST END AND SAID CASING FOR BIASING SAID PLUNGER AGAINST THE PRESSURE EXERTED BY THE PRESSURIZED FLUIDS ON SAID FIRST END, CONDUIT MEANS EXTENDING THROUGH SAID PLUNGER FOR EXHAUSTING FLUIDS FROM SAID SECOND END OF SAID PLUNGER INTO SAID LONGITUDINAL PASSAGEWAY, A FIRST TRANSVERSE WALL SEALING SAID LONGITUDINAL PASSAGEWAY AND PROVIDED WITH AN OPENING THERETHROUGH, AND MEANS CARRIED BY SAID SECOND END OF SAID PLUNGER FOR SEALING SAID OPENING, THE FORCE OF SAID SPRING URGING SAID SEALING MEANS OUT OF ENGAGEMENT WITH SAID OPENING WHEN THE PRESSURE OF THE SOURCE FALLS BELOW A PRESELECTED LEVEL WHEREBY PRESSURIZED FLUIDS ARE DISCHARGED THROUGH SAID OPENING INTO SAID LONGITUDINAL PASSAGEWAY, THE IMPROVEMENT COMPRISING: A SECOND TRANSVERSE WALL SEALING SAID LONGITUDINAL PASSAGEWAY AND PROVIDED WITH A LONGITUDINAL VALVE OPENING, SAID SECOND TRANSVERSE WALL BEING SPACED FROM SAID FIRST TRANSVERSE WALL TO PROVIDE AN EXPANSION CHAMBER THEREBETWEEN INTO WHICH PRESSURIZED FLUIDS FROM THE SOURCE ARE DISCHARGED, MEANS INTERPOSED BETWEEN SAID FIRST TRANSVERSE WALL AND SAID SECOND TRANSVERSE WALL FOR METERING THE FLOW OF FLUIDS INTO SAID EXPANSION CHAMBER, A BEATER DISPOSED WITHIN SAID LONGITUDINAL PASSAGEWAY, SAID BEATER HAVING A FIRST END PORTION EXTENDING THROUGH AND ENGAGED WITH SAID SEALING ELEMENT AND A SECOND END PORTION SPACED FROM SAID FIRST END PORTION, MEANS POSITIONED FOR ACTUATION BY SAID SECOND END PORTION OF SAID BEATER FOR EMITTING A SIGNAL, AND MEANS ENGAGED WITH SAID BEATER FOR URGING SAID FIRST END PORTION INTO SEALING ENGAGEMENT WITH SAID SEALING ELEMENT, SAID BEATER BEING MOVABLE CYCLICALLY BETWEEN A SEATED POSITION UNDER THE FORCE OF SAID URGING MEANS AND AN UNSEATED POSITION UNDER THE FORCE EXERTED BY FLUIDS ACCUMULATED IN SAID EXPANSION CHAMBER, SAID BEATER ACTUATING SAID SIGNAL EMITTING MEANS WHEN IN SAID UNSEATED POSITION.