FIRE AND BURGLAR ALARM SYSTEM

• US 3,686,668 A
• Filed: 03/04/1970
• Issued: 08/22/1972
• Est. Priority Date: 03/04/1970
• Status: Expired due to Term

• Current Assignee: John E. Durkee
• Original Assignee: John E. Durkee
• Inventors: Durkee, John E.
• Primary Examiner(s): Habecker, Thomas D.
• Assistant Examiner(s): Wannisky, William M.
• Application Number:
  US05/016,398
• Time in Patent Office: 902 Days
• Field of Search: 340/420,274,409,276,421,293,222,297
• US Class Current: 340/508
• CPC Class Codes: G08B 19/00 Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow

Abstract

A security system for a building including a circuit having heat detectors responsive to smoke or fire in the building to enable an alarm generator to provide an alarm signal, and an entry circuit having normally open and normally closed entry switches for detecting an unauthorized entry of the building, the entry circuit being energized whenever one of the entry switches is operated to enable the alarm generator to provide a different alarm, and the entry circuit further having a ready indicator for indicating when an entry switch is operated.

Claims

1. In a burglar alarm system for providing an alarm in response to the detection of an unauthorized entry of a building, said system comprising alarm generating means, control circuit means including a control relay operable when energized to effect energization of said alarm generating means to provide an alarm, said control relay having a winding with first and second ends, means for connecting the first end of said winding to a point of energizing potential, current rectifier means and indicator means connected in a series circuit path between the second end of said winding and a point of reference potential for providing an energizing path for said control relay, and entry switch means having a normally closed switch connected between said current rectifier means and said point of energizing potential for extending said energizing potential to said current rectifier means to reverse bias said current rectifier means whenever said switch is unoperated to thereby interrupt said energizing path, said switch being operated in response to an unauthorized entry of said building to enable the second end of the winding of said control relay to be connected to the point of reference potential over said series circuit path whereby said control relay is operated to affect energization of said alarm generating means.

2. A security system as set forth in claim 1 in which said alarm generating means include signal generating means and drive circuit means controlled by said control relay for providing an intermittent drive signal for said signal generating means.

3. A system as set forth in claim 2 which includes further control circuit means including temperature sensitive means operated responsive to heat or smoke of a temperature in excess of a predetermined temperature for effecting energization of said alarm generating means to provide a different alarm.

4. A system as set forth in claim 3 which includes first manual alarm switch means for manually energizing said alarm generating means to provide said alarm, and second manual alarm switch means for manually energizing said alarm generating means to provide said different alarm.

5. A system as set forth in claim 1 in which there is at least one lamp located outside of the building, and which includes lamp drive means controlled by said alarm generating means and operated whenever said alarm generating means are energized to energize said lamp and provide a visual alarm signal external to said building.

6. A system as set forth in claim 5 wherein said lamp drive means includes first switching means operated by said alarm generating means in response to an unauthorized entry to effect energization of said lamp and second switching means operated by said first switching means for disabling said first switching means and effecting deenergization of said lamp, said second switching means being disabled by said first switching means when said first switching means are disabled permitting said first switching means to be reoperated by said alarm generating means and said lamp to be reenergized, whereby an intermittent drive is provided for said lamp.

7. A system as set forth in claim 6 in which said lamp drive means includes third switching means for manually energizing said lamp, said first and second switching means being effective to override said third switching means in response to an unauthorized entry.

8. A system as set forth in claim 1 in which said entry switch means comprise authorized entry switch means including key-operated switch means for activating said control circuit from the outside of said building.

9. A system as set forth in claim 8 in which said authorized entry switch means further include tamper switch means responsive to tampering to effect the energization of said alarm generating means.

10. A system as set forth in claim 9 in which said tamper switch means include first switch means for activating said control circuit, and second switch means operative to energize said control means when said control circuit is activated to effect energization of said alarm generating means.

11. A system as set forth in claim 1 wherein said entry switch means includes a further normally open switch connected between said second end of said winding and said point of reference potential to provide a further energizing path for said control relay whenever said further switch is operated.

12. In an alarm system, alarm means, relay means including means for energizing said alarm means, a control circuit for selectively enabling said relay means comprising an energizing circuit including said relay means, rectifier means, and resistance means connected in series across a source of potential, and entry switch means for normally shunting said energizing circuit including at least one make-break circuit switch which has a first position for completing a shunt path across said relay means and said rectifier means and extending a potential to reverse bias said rectifier means to thereby interrupt said energizing circuit for said relay means whenever said switch is in said first position, and which has a second position for interrupting said shunt path and the reverse bias potential for said rectifier means to thereby enable said energizing circuit to be completed and said relay means to be energized.

13. An alarm system as set forth in claim 12 in which said resistance means comprises an indicator lamp and said energizing circuit includes a second circuit make-break switch operable to activate said control circuit.

14. A system as set forth in claim 13 which includes remote manual alarm switch means connected to said control circuit for manually energizing said alarm means from a remote location, the deactivation of said control circuit by said second make-break-switch being ineffective to deenergize said alarm means whenever said remote manual alarm switch means are operated.

15. A system as set forth in claim 13 in which said energizing circuit includes remote switch means for activating said control circuit from a remote location.

16. A system as set forth in claim 15 which includes means for indicating at said control circuit and at said remote location that said control circuit is activated.

17. An alarm system as set forth in claim 12 wherein said relay means includes a contact connected in series with said make-break circuit switch across said relay means.

18. In a burglar alarm system for providing an alarm in response to the detection of an unauthorized entry of a building, said system comprising alarm generating means, and control circuit means including control means operable when energized to effect the energization of said alarm generating means, energizing means for providing a series circuit energizing path for said control means, including rectifier means connected in series with said control means across a source of potential, and entry switch means for providing a normally closed shunt circuit path for a portion of said energizing path said shunt circuit path including at least one normally closed entry switch which is connected across said control means and said rectifier means to extend a potential for reverse biasing said rectifier means whenever said entry switch is closed whereby said energizing path is normally interrupted and said control means is normally deenergized, said entry switch being operable in response to an unauthorized entry of said building to open said shunt circuit path enabling said control means to be energized.

19. A system as set forth in claim 18 in which said entry switch means includes a further switch means for providing a normally open energizing circuit path for said control means, said further switch means being operable in response to an unauthorized entry of said building to effect the energization of said control means.

20. In a burglar alarm system for providing an alarm in response to the detection of an unauthorized entry of a building, said system comprising alarm generating means, a control circuit including control means operable when energized to effect the energization of said alarm generating means, energizing means including remote switch means for providing a series circuit energizing path connecting said control means to a source of potential for energizing said control means, and entry switch means including means for providing a normally closed shunt circuit path for a portion of said energizing path to maintain said control means disabled, said entry switch means being operable in response to an unauthorized entry of said building to open said shunt circuit path to thereby enable said control means to be energized, said remote switch means being operable to activate said control circuit from a remote location to enable said control means to be energized responsive to operation of said entry switch means.

21. A system as set forth in claim 20 in which said remote switch means include authorized entry switch means having key-operated switch means for activating said control circuit from outside of said building, indicator means for indicating when said control circuit is activated, and tamper switch means responsive to tampering to activate said control circuit and to effect energization of said control means whereby said alarm generating means is energized to provide said alarm.

22. In a security system for a building, alarm generating means including signal generating means, first drive circuit means for said signal generating means including self interrupting switching means operable when said first drive circuit means are energized to energize said signal generating means intermittently to provide a first alarm, second drive circuit means operable when enabled to energize said signal generating means continuously to provide a second alarm, a first control circuit including control means operable when enabled to effect the energization of one of said drive means to provide one of said alarms, normally closed entry switch means operable in response to an entry of said building while said first control circuit is activated to enable said control means to be energized, a second control circuit including temperature sensitive means operated responsive to heat or smoke of a temperature in excess of a predetermined temperature for effecting the energization of the other of said drive circuit means to provide said other alarm, first manual alarm switch means for permitting manual energization of said first drive means and second manual alarm switch means for permitting manual energization of said second drive means.