Flush pendent sprinkler head

Claim 1

IN AN AUTOMATIC SPRINKLER SYSTEM, A SPRINKLER HEAD COMPRISING A BODY MEMBER HAVING A WATER DISPENSING BORE THERETHROUGH; MEANS ON SAID BODY MEMBER FOR CONNECTING SAID BORE TO A WATER SUPPLY SYSTEM; A U-SHAPED FRAME MOUNTED ON SAID BODY MEMBER; A DEFLECTOR MOUNTED ON SAID FRAME IN ALIGNMENT WITH SAID WATER DISPENSING BORE; WALLS ON SAID BORE DEFINING A VALVE SEAT AT THE END THEREOF; A VALVE CAP DIMENSIONED TO SEAT ON SAID VALVE SEAT; A PAIR OF OPPOSED ARMS; MEANS INCLUDING A PAIR OF SOCKETS EACH SOCKET COMPRISING A PAIR OF OUTWARDLY EXTENDING FLANGES AND A PIVOT PIN DISPOSED THEREBETWEEN SECURED TO SAID BODY MEMBER FOR SWINGABLY RECEIVING ONE OF SAID OPPOSED ARMS, EACH OF SAID ARMS BEING SWINGABLE OUTWARDLY FROM A FIRST POSITION GENERALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID BORE TO A SECOND POSITION SPACED OUTWARDLY THEREFROM; A HOOK PORTION AT THE END OF EACH OF SAID ARMS FOR RECEIVING A FUSIBLE LINK THEREBETWEEN, SAID FUSIBLE LINK NORMALLY MAINTAINING SAID ARMS IN SAID FIRST POSITION; AN INWARDLY PROJECTING SHOULDER FORMED ON EACH OF SAID OPPOSED ARMS; A TENSION BAR; A PRESSURE SCREW SCREWABLY RECEIVED IN SAID TENSION BAR FOR POSITIONING AGAINST THE CENTRAL PORTION OF SAID VALVE CAP; TERMINAL PORTIONS ON SAID TENSION BAR FOR BEARING AGAINST SAID SHOULDERS FORMED ON SAID OPPOSED ARMS TO APPLY A SEATING PRESSURE TO SAID CENTRAL PORTION OF SAID VALVE CAP; A BASE; WALLS ON SAID BASE FOR RECEIVING SAID BODY MEMBER THEREIN; AND A CEILING PLATE REMOVABLY SECURED TO SAID BASE, SAID CEILING PLATE HAVING A TERMINAL PORTION ADAPTED FOR CLOSE FITTING ENGAGEMENT AGAINST THE UNDER SURFACE OF A CEILING.