Near alarm receiver having-time delay of discharge type

Claim 1

IN AN ALARM SYSTEM HAVING A SOURCE OF ELECTRICAL POWER AND MEANS SELECTIVELY IMPOSING A PREDETERMINED ACTUATION SIGNAL THEREON, A DELAYED ACTION ALARM DEVICE COMPRISING, (A) AN ALARM CIRCUIT INCLUDING SWITCHING MEANS AND MEANS PRODUCING AN AUDIBLE ALARM UPON ACTUATION OF SAID SWITCHING MEANS, (B) ENERGIZATION MEANS OPERABLE TO ACTUATE SAID SWITCHING MEANS AFTER A PREDETERMINED TIME INTERVAL HAS ELAPSED FROM INITIAL RECEIPT OF SAID ACTUATION SIGNAL AND INCLUDING AN ENERGIZING CIRCUIT AND A TIME DELAY MEANS, (C) SAID ENERGIZING CIRCUIT BEING OPERABLE TO ACTIVATE SAID TIME DELAY MEANS ONLY UPON RECEIPT OF SAID PREDETERMINED ACTUATION SIGNAL, (D) SAID TIME DELAY MEANS BEING OPERABLE TO ACTUATE SAID SWITCHING MEANS UPON THE LAPSE OF A PREDETERMINED TIME INTERVAL AFTER BEING ACTIVATED BY SAID ENERGIZING CIRCUIT, (E) SAID TIME DELAY MEANS INCLUDING A FIRST CAPACITOR, A SECOND CAPACITOR, A BLOCKING DIODE COUPLING SAID CAPACITORS, ELECTRICAL POWER MEANS NORMALLY MAINTAINING SAID CAPACITORS IN A CHARGED STATE, MEANS DISCHARGING SAID CAPACITORS AT A PREDETERMINED RATE UPON SAID DELAY MEANS BEING ACTIVATED AND MEANS ACTUATING SAID SWITCHING MEANS WHEN SAID CAPACITORS HAVE BEEN DISCHARGED A PREDETERMINED AMOUNT, AND