Hazard alarm, system, and communication therefor

• US 6,611,204 B2
• Filed: 04/16/2001
• Issued: 08/26/2003
• Est. Priority Date: 04/16/2001
• Status: Expired due to Term

• Current Assignee: Maple Chase Company (Schneider Electric SE)
• Original Assignee: Maple Chase Company (Schneider Electric SE)
• Inventors: Schmurr, Randol M.
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/835,685
• Publication Number:
  US 20020171544A1
• Time in Patent Office: 862 Days
• Field of Search: 340/506, 340/517, 340/538, 340/521, 340/3.1, 340/825.36, 340/825.49
• US Class Current: 340/538
• CPC Class Codes: G08B 25/04 using a single signalling line, e.g. in a closed loop

Abstract

A hazard alarm and alarm system enables a plurality of hazard alarms of multiple types (e.g. smoke alarms, heat alarms, motion detectors, carbon monoxide alarms, gas alarms, and the like), to communicate with one another without generating conflicting alarm warning indicators. Electronic circuitry is also provided, that may be added to at least one of the hazard alarms, for transmitting and receiving digital information with other hazard alarms connected thereto.

Claims

1. A hazard alarm for use in a hazard alarm system, said hazard alarm comprising:

an interface circuit;

a first type sensor coupled to said interface circuit;

a first type alarm indicator coupled to said first type sensor;

a transmitter coupled to said interface circuit to generate a first type signal in response to a first type alarm event detected by the first type sensor, the first type signal being receivable by at least one other hazard alarm connected thereto, to trigger a first type alarm indicator therein, while being free from triggering any second type alarm indicator connected thereto;

a signal receiver operatively coupled to said interface circuit to receive first type signals and second type signals, and to selectively actuate and not actuate said first type alarm indicator upon respective receipt thereof.

2. The alarm of claim 1, further comprising a second type alarm indicator integrally disposed therein, being selectively actuatable and unactuatable upon receipt of the second type signals and first type signals, respectively.

3. The alarm of claim 2, further comprising a second type sensor coupled to said second type alarm indicator.

4. The alarm of claim 1 wherein said alarm indicator is an audible or visible signal.

5. The alarm of claim 1, comprising a first type hazard alarm selected from the group consisting of smoke alarms, heat alarms, carbon monoxide alarms, motion detectors, gas alarms, and building security devices.

6. The alarm of claim 1, comprising a plurality of interconnect ports.

7. The alarm of claim 6 wherein said plurality of interconnect ports comprises first, second, and third interconnect ports, said first and second interconnect ports being configured to receive AC power, and said third interconnect port being coupled to said interface circuit to communicate with the at least one other hazard alarm connected thereto.

8. The alarm of claim 6 wherein said plurality of interconnect ports comprises first and second interconnect ports, said first interconnect port being configured to communicate with the at least one other hazard alarm connected thereto, said second interconnect port being configured as a voltage reference.

9. The alarm of claim 8 comprising a local power source.

10. The alarm of claim 1 wherein said interface circuit is coupled to a logic module for transmitting and receiving digital information.

11. The alarm of claim 10, wherein said logic module is a member of the group consisting of an electronic circuit, a microcontroller, an electronic processor, a programmable logic device, a communications processor, a computer, and computer readable program code.

12. The alarm of claim 1, wherein said interface circuit comprises a filter and an amplifier.

13. The alarm of claim 12, wherein said interface circuit comprises an input protection portion, a high pass filter portion, and a signal amplifier portion.

14. The alarm of claim 13 wherein said input protection portion comprises at least one input protection component selected from the group consisting of a metal oxide varistor and a zener diode.

15. The alarm of claim 14 wherein said input protection component comprises a metal oxide varistor electrically coupled in parallel with a resistor.

16. The alarm of claim 13 wherein said high pass filter portion comprises a transistor.

17. The alarm of claim 16 wherein said transistor is coupled to at least one resistor and at least one capacitor.

18. The alarm of claim 13 wherein said signal amplifier portion comprises a low pass filter coupled to a transistor.

19. The alarm of claim 18 wherein said signal amplifier portion comprises at least two DC bias resistors coupled to a DC bypass capacitor.

20. The alarm of claim 1 wherein said first type signal is communicated in the form of a plurality of electronic pulses.

21. The alarm of claim 20 wherein each of said plurality of electronic pulses has a duration of less than about 5 milliseconds.

22. The alarm of claim 21 wherein each of said plurality of electronic pulses has a duration of from about 2 to about 20 microseconds.

23. The alarm of claim 20 wherein each of said plurality of electronic pulses includes a high pulse, which is preceded and succeeded by high impedance.

24. The alarm of claim 23 wherein said high pulse has a DC voltage of about 9 volts.

25. The alarm of claim 1 wherein said interface circuit transmits and receives digital information at a bit rate of greater than about 100 bits per second.

26. The alarm of claim 25 wherein said interface circuit transmits and receives said digital information at a bit rate of greater than about 10000 bits per second.

27. An alarm system comprising a plurality of first type hazard alarms including said hazard alarms of claim 1, said first type hazard alarms being interconnected to one another.

28. The system of claim 27, comprising:

a plurality of second type hazard alarms having second type alarm indicators therein, said second type hazard alarms being interconnected to said first type hazard alarms;

wherein an alarm event in any one of said plurality of first type hazard alarms triggers a first type alarm indicator in at least one other of said plurality of first type hazard alarms interconnected thereto, while not triggering any of said second type alarm indicators.

29. The system of claim 28 wherein an alarm event in any one of said plurality of second type hazard alarms triggers an alarm indicator in at least one other of said plurality of second type alarm indicators interconnected thereto, while not triggering any of said first type alarm indicators interconnected thereto.

30. The system of claim 28 wherein said first type hazard alarm is a carbon monoxide alarm and said second type hazard alarm is a smoke alarm.

31. The system of claim 28 wherein said second type hazard alarm includes a low pass filter circuit.

32. The system of claim 31 wherein said second type hazard alarm is a member of the group consisting of smoke alarms, heat alarms, carbon monoxide alarms, motion detectors, gas alarms, and building security devices.

33. The system of claim 32 wherein said second type hazard alarm is a smoke alarm.

34. An alarm system comprising:

a plurality of hazard alarms including a plurality of first type hazard alarms and a plurality of second type hazard alarms;

each one of said plurality of hazard alarms including at least one interconnect port;

said first type hazard alarms including an interface circuit coupled to said interconnect port to respectively transmit and receive information with others of said plurality of hazard alarms interconnected thereto;

wherein an alarm event in any one of said plurality of first type hazard alarms triggers an alarm indicator in at least one other of said plurality of first type hazard alarms interconnected thereto, while not triggering an alarm indicator in any of said plurality of second type hazard alarms interconnected thereto;

wherein said interface circuit transmits and receives said information at a bit rate of greater than about 100 bits per second.

35. The system of claim 34 wherein an alarm event in any one of said plurality of second type hazard alarms triggers an alarm indicator in at least one other of said plurality of second type hazard alarms interconnected thereto, while not triggering an alarm indicator in any of said plurality of first type hazard alarms interconnected thereto.

36. The system of claim 34 wherein each of said plurality of hazard alarms includes three interconnect ports, two of which are used to receive AC power, the other of which is used for communicating with said plurality of hazard alarms interconnected thereto.

37. The system of claim 34 wherein each of said plurality of hazard alarms includes two interconnect ports, one of which is used for communicating with said plurality of hazard alarms interconnected thereto, the other of which is utilized as a voltage reference.

38. The system of claim 34 wherein said interface circuit is coupled to a logic module, said logic module being a member of the group consisting of an electronic circuit, a microcontroller, an electronic processor, a programmable logic device, a communications processor, a computer, and computer readable program code.

39. The system of claim 34 wherein said interface circuit comprises a filter and an amplifier.

40. The system of claim 39 wherein said interface circuit comprises an input protection portion, a high pass filter portion, and a signal amplifier portion.

41. The system of claim 34 wherein said first type hazard alarm is a member of the group consisting of smoke alarms, heat alarms, carbon monoxide alarms, motion detectors, natural gas alarms, and propane gas alarms.

42. The system of claim 41 wherein said first type hazard alarm is a carbon monoxide alarm.

43. The system of claim 34 wherein said second type hazard alarm is a smoke alarm.

44. The system of claim 34 wherein said first type hazard alarm is a carbon monoxide alarm and said second type hazard alarm is a smoke alarm.

45. The system of claim 34 wherein said information is communicated in the form of a plurality of electronic pulses.

46. The system of claim 45 wherein each of said plurality of electronic pulses has a duration of less than about 5 milliseconds.

47. The system of claim 45 wherein each of said plurality of electronic pulses includes a high pulse, which is preceded and succeeded by high impedance.

48. The system of claim 47 wherein said high pulse has a DC voltage of about 9 volts.

49. A combination smoke and carbon monoxide alarm system, said system comprising:

a plurality of carbon monoxide alarms;

a plurality of smoke alarms;

each of said plurality of carbon monoxide alarms and each said plurality of smoke alarms including at least one interconnect port;

each of said plurality of carbon monoxide alarms including an interface circuit coupled to said interconnect port to transmit and receive information with other hazard alarms interconnected thereto;

wherein an alarm event in at least one of said smoke alarms does not trigger an alarm indicator in any of said carbon monoxide alarms interconnected thereto and an alarm event in at least one of said carbon monoxide alarms does not trigger an alarm indicator in any of said smoke alarms interconnected thereto.

50. The system of claim 49 wherein each of said plurality of hazard alarms includes three interconnect ports, two of which are used to receive AC power, the other of which is used for communicating with said plurality of hazard alarms interconnected thereto.

51. The system of claim 49 wherein each of said plurality of hazard alarms includes two interconnect ports, one of which is used for communicating with said plurality of hazard alarms interconnected thereto, the other of which is used as a voltage reference.

52. The system of claim 49, comprising a logic module coupled to said interface circuit, said logic module being a member of the group consisting of an electronic circuit, a microcontroller, an electronic processor, a programmable logic device, a communications processor, a computer, and computer readable program code.

53. The system of claim 49 wherein said interface circuit comprises an input protection portion, a high pass filter portion, and a signal amplifier portion.

54. The system of claim 49 wherein said information is communicated in the form of a plurality of electronic pulses.

55. The system of claim 54 wherein each of said plurality of electronic pulses has a duration of less than about 5 milliseconds.

56. The system of claim 54 wherein each of said plurality of electronic pulses includes a high pulse, which is preceded and succeeded by high impedance.

57. The system of claim 56 wherein said high pulse has a DC voltage of about 9 volts.

58. The system of claim 49 wherein said interface circuit transmits and receives digital information at a bit rate of greater than about 100 bits per second.

59. A kit for upgrading a smoke alarm system having a plurality of smoke alarms electrically connected to one another, the kit comprising a plurality of carbon monoxide alarms, each of said carbon monoxide alarms including:

at least one interconnect port;

an interface circuit coupled to said interconnect port to communicate information with other hazard alarms interconnected thereto;

a sensor coupled to the interface circuit to detect an alarm event;

an alarm indicator coupled to the sensor;

a transmitter coupled to said interconnect port to generate a first signal type in response to the alarm event, the first signal type being receivable by at least one other carbon monoxide detector to trigger an alarm indicator therein, while not triggering an alarm indicator in any of the smoke alarms connected thereto;

a signal receiver operatively coupled to said interconnect port to receive signals of the first and a second signal types, and to selectively actuate and not actuate said alarm indicator upon receipt of signals of the first and second types, respectively.

60. A method of fabricating a hazard alarm for use in a hazard alarm system, said method comprising:

providing an interface circuit;

coupling a first type sensor to said interface circuit;

coupling a first type alarm indicator to said first type sensor;

coupling a transmitter to said interface circuit to generate a first type signal in response to a first type alarm event detected by the first type sensor, the first type signal being receivable by at least one other hazard alarm connected thereto, to trigger a first type alarm indicator therein, while being free from triggering any second type alarm indicator connected thereto; and

operatively coupling a signal receiver to said interface circuit to receive first type signals and second type signals, and to selectively actuate and not actuate said first type alarm indicator upon respective receipt thereof.

61. A method for upgrading an existing smoke alarm system, having a plurality of smoke alarms electrically connected to one another, said method comprising:

providing a plurality of carbon monoxide alarms, each of said carbon monoxide alarms including an interface circuit coupled to an interconnect port to transmit and receive information with other hazard alarms interconnected thereto;

configuring the carbon monoxide alarms to trigger an alarm indicator in at least one other of said plurality of carbon monoxide alarms in response to an alarm event, while not triggering an alarm indicator in any of the plurality of smoke alarms; and

electrically coupling said plurality of carbon monoxide alarms to said smoke alarm system.