DETECTOR DEVICE

• US 3,806,921 A
• Filed: 04/18/1972
• Issued: 04/23/1974
• Est. Priority Date: 04/18/1972
• Status: Expired due to Term

• Current Assignee: Dennis Gerasimos Pappas
• Original Assignee: Dennis Gerasimos Pappas
• Inventors: Pappas, Dennis Gerasimos
• Primary Examiner(s): Habecker, Thomas B.
• Application Number:
  US05/245,148
• Time in Patent Office: 735 Days
• Field of Search: 340/227R,228R,412
• US Class Current: 340/529
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence

Abstract

A detector/indicating system for employment, typically, in a fire alarm network; the system comprising a detector head which is actuable to generate and transmit a signal, and a remote receiver adapted to receive and give indication of signals transmitted by the detector head.

Claims

1. An alarm and indicating system, comprising:

at least one detector head having an alarm switching means actuated in response to a predetermined alarm condition;

a coded signal generator, said generator being controlled by the switching means for generating a coded R.F. signal in response to actuation of said switching means;

at least one receiver means remotely located with respect to said detector head for receiving R.F. signals transmitted by said detector head, said receiver means decoding said codeD signals to give an alarm output;

a display panel having at least one alarm reception indicator and being remotely located with respect to said receiver;

a transmission line connecting said receiver with said display panel; and

, means at said receiver for transmitting an alarm signal to said display panel over said transmission line.

2. An alarm and indicating system as claimed in claim 1 in which a plurality of said detector heads and at least one said receiver are respectively disposed at respective levels of a multistory building, whereby at least one said receiver receives signals initiated by at least one said detector head disposed at an associated level of the building.

3. An alarm and indicating system as claimed in claim 2 and further including a power supply means comprising a mains-floating battery for energizing said display panel and each of said receivers.

4. An alarm and indicating system as claimed in claim 2 wherein a signal time delay means is interposed between said receivers and said transmission line for delaying initiation of indication of transmitted signal for a predetermined period of time.

5. An alarm and indicating system as claimed in claim 2 wherein each receiver has means to generate a frequency coded output signal, for transmission to the display panel, which is independent of but initiated by a signal transmitted by the respective alarm switching means.

6. An alarm and indicating system as claimed in claim 5 and further including a transmission line-pair common to all said receivers, the output signal from each receiver being coded differently from the other receivers on the line-pair.

7. An alarm and indicating system as claimed in claim 6 wherein each receiver output coded signal is modulated by a unique group of modulation frequencies to represent each level of the building.

8. An alarm and indicating system as claimed in claim 7 wherein, said display panel further includes means for detecting at least one signal input from at least one said receiver located at each level of the multistory building for indicating the multistory building level and level area source of signal transmission.

9. An alarm and indicating system as claimed in claim 2 wherein the signal transmitted from each said detector head associated with one said receiver is coded differently from the signal transmitted from the other said detector heads associated with another said receiver located within the transmitting range of the first mentioned detector heads.

10. An alarm and indicating system as claimed in claim 9 wherein the coded signal transmitted by each detector head comprises a carrier signal which is modulated by at least one modulating signal.

11. An alarm and indicating system as claimed in claim 9 wherein the coded signal transmitted by each detector head is modulated by two of at least three selected modulation frequencies, a different pair of modulation frequencies being employed for detector heads located at different levels of the building.

12. An alarm and indicating system as claimed in claim 9 wherein the coded signal transmitted by each detector head is modulated by two of at least three selected modulation frequencies, a different pair of modulation frequencies being employed for detector heads located at different level areas of the building.