Title:
COMBINATION BURGLAR ALARM AND FIRE ALARM SYSTEM
United States Patent 3810171
Abstract:
The system includes fire alarm and burglar alarm portions and a common power supply therefor. The burglar alarm portion includes (1) alarm sensors and an alarm circuit for generating signals in response to the operation thereof; (2) a "panic" portion, operable by an individual anywhere in the premises protected, and connected to the alarm circuit and operable thereby whether power is directly connected thereto or not; and (3) status lights and power switch combinations dispersed throughout the premises to display the status of the system. The fire alarm portion includes sensors dispersed throughout the premises and an alarm signal generating circuit.
US Patent References:
Electric burglar alarm system with exit and entry delay
Worley - August 1965 - 3200393
CENTRALLY LOCATED ACCESS ALARM SYSTEM
Friberg - February 1972 - 3641552
ALARM CIRCUIT
Benedict - July 1972 - 3678511
Electric burglar alarm system with exit and entry delay
Worley - August 1965 - 3200393
CENTRALLY LOCATED ACCESS ALARM SYSTEM
Friberg - February 1972 - 3641552
ALARM CIRCUIT
Benedict - July 1972 - 3678511
Application Number:
05/282245
Publication Date:
05/07/1974
Filing Date:
08/21/1972
View Patent Images:
Export Citation:
Assignee:
Aerolite Electronics Corporation (Union City, NJ)
Primary Class:
Other Classes:
340/691.300, 340/593, 340/545.100
International Classes:
G08B19/00; G08B23/00
Field of Search:
340/420,274
Primary Examiner:
Habecker, Thomas B.
Attorney, Agent or Firm:
Green, Robert A.
Claims:
1. A burglar-fire alarm system for protecting premises comprising
2. The system defined in claim 1 and including:
3. The system defined in claim 1 and including
4. The system defined in claim 1 wherein said signal-generating circuit includes at least one semiconductor device having a plurality of electrodes, said connections from said panic circuit coupling operating potentials to selected ones of said electrodes when said panic circuit
5. The system defined in claim 1 wherein said semiconductor switches are silicon-controlled rectifiers having anode, cathode, and gate electrodes, said first and second semiconductor switches having their anodes connected together to positive power supply, said first switch having its cathode connected (1) to said signal-generating circuit for coupling operating potential thereto and (2) through a diode to the gate of said second switch, the cathode of said second switch being connected to another portion of said signal-generating circuit for coupling operating potential
6. An alarm system as in claim 1 and including positive and negative buses connected to the positive and negative terminals, respectively, of said power supply,
7. An alarm system comprising
8. The system defined in claim 7 wherein said first and second semiconductor switchs are three-electrode controlled rectifier switches.
9. An alarm system comprising
10. An alarm system comprising
11. An alarm system including
2. The system defined in claim 1 and including:
3. The system defined in claim 1 and including
4. The system defined in claim 1 wherein said signal-generating circuit includes at least one semiconductor device having a plurality of electrodes, said connections from said panic circuit coupling operating potentials to selected ones of said electrodes when said panic circuit
5. The system defined in claim 1 wherein said semiconductor switches are silicon-controlled rectifiers having anode, cathode, and gate electrodes, said first and second semiconductor switches having their anodes connected together to positive power supply, said first switch having its cathode connected (1) to said signal-generating circuit for coupling operating potential thereto and (2) through a diode to the gate of said second switch, the cathode of said second switch being connected to another portion of said signal-generating circuit for coupling operating potential
6. An alarm system as in claim 1 and including positive and negative buses connected to the positive and negative terminals, respectively, of said power supply,
7. An alarm system comprising
8. The system defined in claim 7 wherein said first and second semiconductor switchs are three-electrode controlled rectifier switches.
9. An alarm system comprising
10. An alarm system comprising
11. An alarm system including
Description:
BACKGROUND OF THE INVENTION
Burglar and fire alarm systems are well known in the art; however, none is as inexpensive to operate or as versatile in the number of functions which can be performed as is the present invention.
SUMMARY OF THE INVENTION
Briefly, the invention comprises a burglar-fire system which includes interrelated burglar and fire alarm operating modules and auxiliary operating adjuncts therefor.
DESCRIPTION OF THE DRAWING
The single FIGURE is a schematic representation of an electronic system embodying the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The system of the invention 10 includes a primary power source such a battery 20 which provides power for the entire system which includes a burglar alarm portion and a fire alarm portion. The burglar alarm portion includes a signaling device such as an electromagnetic bell or horn 30 having an associated filter circuit 40 which, in a preferred construction, includes a diode 50, oriented as shown across the horn, and parallel wire coils 60 and 70, one copper and one silver, progressively universal wound. Coil 70 has one end connected to one end of the horn 30, and coil 60 has its opposite end connected to the other end of the horn. A second diode is connected, oriented as shown, between opposite ends of the coils. Preferably, the arrangement is anodes of the diodes to the silver wire and cathodes of the diodes to the copper wire. This filter eliminates the high positive spikes which might be generated with a magnetic bell or horn due to induced magnetic fields and systeresis effects.
The burglar alarm portion of the invention includes a signal module 90 shown enclosed in dash lines for generating an alarm signal which can be coupled to a remote receiver, for example, at a police station. This module is shown and described in U.S. Pat. No. 3,603,947 and includes two semiconductor switches 100 and 110, for example, G. E. Type 4987 silicon unilateral switches. These SUS devices are planar, monolithic, integrated circuits having thyristor electrical characteristics closely approximating those of an ideal four-layer diode. SUS switch 100 has its anode A connected through resistor 120 to a positive bus 130 and its gate G connected through a resistor 140 to a negative bus 150. The switch 110 has its anode A connected to positive bus 130 and its gate G connected (1) through a resistor 153 to the positive bus 130, and (2) through a resistor 160 to bus 170 and thence to a relay 520 to be described. The cathode K of SUS switch 100 is connected to a bus 180, and the cathode K of SUS switch 110 is connected (1) through a resistor 190 to one emitter 200 of a unijunction transistor (UJT) 210, and (2) through a resistor 220 to the slider 223 and to one end of a potentiometer 230, the other end of the potentiometer being connected (1) to the emitter 240 of the unijunction transistor 210 and (2) through a capacitor 250 to the negative bus 150.
The second base 260 of the unijunction transistor is connected by lead 262 to bus 180, and this junction point 264 is connected through a resistor 270 to bus 150. The second base 260 of the unijunction transistor 210 is also connected to the gate of silicon controlled rectifier SCR 280, the cathode of which is connected to negative bus 150, and the anode of which is connected (1) through resistor 290 to positive bus 130, and (2) by lead 300 to the cathode of diode 80 of the filter 40. Lead 300 from the anode of SCR 280 is connected by lead 310 to a suitable remote signal or alarm circuit 320, as shown in the aforementioned patent.
The positive bus 130 is connected to the anode of diode 80 and to the associated end of winding 70 of filter 40.
The burglar alarm system includes a plurality of light and switch templates 321 dispersed throughout the premises and each including a lamp 322, a switch 323, and a lamp 324. One end of each of these elements is connected to a bus 325, and the other end of each lamp 322 is connected to bus 326, the other end of each switch 323 is connected to bus 327, and the other end of each lamp 324 is connected to a bus 328. The switches 323 are preferably key-operable by an occupant of the premises.
The burglar alarm portion also includes a single pole, double throw relay 330 including a winding 340 with a diode 342 across it, an armature 350, and two contacts 360 and 370 (armature 350 is normally closed on contact 360), and armature 380 and two contacts 390 and 400 (armature 380 is normally closed on contact 390). Armature 380 is connected (1) through a resistor 410 to a lead 420 which extends from contact 390 to the gate of SUS 100, and (2) through lead 430 to a series of normally closed switches S1 and finally through lead 440 to bus 450 which extends from the positive terminal of battery 20. Switches S1 represent burglar sensing elements dispersed throughout the premises being protected, and associated with windows, doors, and the like represented by numeral 455, and they may be mechanical switches, ultrasonic devices, infrared devices, or the like. Contact 400 is connected to lead 326 associated with lamps 322 of templates 321.
Referring again to relay 330, armature 350 is connected by lead 460 to bus 450 and thus to the positive terminal of battery 20, and contact 360 is connected by lead 470 to positive bus 130 and to bus 326 connected to one side of each lamp 324 of templates 321 which are dispersed throughout the premises. The cathode of diode 342 and end 343 of the winding 340 are connected to bus 329 to switches 323 of templates 321. The other end 345 of the winding 340 and the anode of diode 342 are connected to bus 450 and to the positive terminal of battery 20.
The burglar alarm portion also includes a circuit portion associated with an entry and exit door 480 to the premises. This circuit portion includes a switch 490 associated with the door 480 and adapted to close when the door is opened and open when the door is closed. This portion of the system also includes (1) a lamp 500 and a normally-open, key-operated switch 510 connected together at one end, 501 and 511, respectively, and (2) a relay 520 including a winding 530 paralleled by diode 533, two contacts 540 and 550, and an armature 560 which is normally closed on contact 550. One end 532 of winding 530 is connected (1) by leads 563 and 570 to positive power bus 450, and (2) by lead 580 to end 503 of lamp 500. The connected ends 501 and 511 of lamp 500 and switch 510, respectively, are connected by lead 590 to commonly connected end 534 of winding 530, the cathode of diode 533, and contact 540 of relay 520. The other end 513 of switch 510 is connected (1) by lead 600 to the armature 610 of door switch 490, and (2) by lead 630 to bus 150. The other contact 620 of door switch 490 is connected by lead 640 to the armature 560 of relay 520. Contact 550 of relay 520 is connected to lead 170 which is connected through resistor 160 to the gate of SUS 110 of signal module 90.
The burglar alarm portion of the system also includes a "panic" module 640 which comprises two silicon controlled rectifiers (SCRs) 650 and 660 having their anodes connected together and then coupled (1) to bus 570 and thence to bus 450 connected to the positive terminal of battery 20, and (2) to bus 670. The cathode of SCR 650 is connected (1) by lead 680 to positive bus 130, and (2) through resistor 690 to its gate and through a diode 700, oriented as shown, to the gate of SCR 660. The cathode of SCR 660 has its cathode connected (1) through resistor 710 to bus 180 (to the cathode of SUS 100) and (2) through resistor 720 to its gate and through resistor 730 to bus 740. Between bus 740 and bus 750 (from bus 670) are connected a plurality of normally-open panic switches which are distributed throughout the premises.
As noted, the anodes of SCR 650 and SCR 660 are connected together to lead 670 which is connected to one terminal 770 of normally-closed switch 780, the armature 784 of which is connected by lead 783 to the fire alarm portion 790 of system 10. The fire alarm portion 790 includes an alarm section 800, a series of sensors 810, and a signal-generating portion 820. The sensors 810 are elements, such as thermostats, disposed throughout the premises, and connected between buses 830 and 840 which are terminated by a high resistance potentiometer 850.
The signal-generating portion 820 of the fire alarm portion of the system 10 includes a semiconductor switch, for example, a silicon unilateral switch (SUS) 860 and a silicon controlled rectifier SCR 870. The gate G of SUS 860 is connected (1) through a resistor 880 to bus 783 and (2) to lead 840 to the sensors 810. The anode A of SUS 860 is connected through a resistor 890 to bus 783, and the cathode K of SUS 860 is connected by lead 863 (1) to the gate of SCR 870 and (2) through a resistor 900 to a junction point 910, to which bus 150 and the cathode of SCR 870 are connected. The junction point 910 is also connected through resistor 920 and a voltmeter 930 to bus 830 to the remote sensors 810.
The alarm portion 800 of the fire alarm system also includes an alarm such as an electromagnetic bell or horn 940, having a different characteristic sound than alarm 30, connected to a filter 950 which is similar in construction to the filter 40 associated with alarm 30 and includes diodes 960 and 970 and coils 980 and 990 interconnected as shown.
Operation of the burlgar alarm portion of the system 10 depends on signal-generating module 90 to sense alarm situations represented by switches S1 and to generate an appropriate signal. With relay 330 set to its normal state, as illustrated in the drawing, positive potential appears on the bus 130 from the battery 20 to lead 460, armature 350, contact 360 and lead 470. Thus, the signal module 90 is armed and operable. In addition, positive potential runs from lead 470 to lead 328 which is connected to lamps 324 which have their bus 325 connected to negative potential. Thus, lamps 324 light and represent normal status and operability of the signal module 90.
If one of the alarm sensors, represented by switches S1, is triggered, this action being represented by the opening of a switch S1, positive potential is removed from the gate of SUS 100 which thereby conducts and applies a positive pulse to the gate of SCR 280 which then conducts. Conduction of SCR 280 sends a signal to remote circuit 320, and it turns on alarm or horn 30.
Referring to the panic circuit 640, closure of one of the panic switches 760, by an individual on the premises, couples positive potential from battery 20 through leads 570, 670, and 750 and through resistor 730 to the gate of SCR 660. SCR 660 will now conduct and apply a positive pulse through resistor 710 and lead 180 to the cathode of SUS 100 which will conduct and turn on alarm 30, as described above.
If, for some reason, module 90 is disarmed, for example, if there is no positive potential on bus 130, then firing of SCR 660 of the panic module 640 conducts a positive pulse through diode 700 to the gate of SCR 650 which is fired to apply a positive potential to bus 130. This now permits SUS 100 to fire and operate the alarm 30.
Turning off of the signal module 90 is referred to above and can be accomplished by closing one of the switches 323 associated with the templates 321. When one of these switches is closed, negative potential is coupled from battery 20 over bus 23 and bus 150 to bus 325 to bus 327 to end 343 of winding 340 of relay 330. Current now flows through the winding 340 and causes the arms 350 and 380 thereof to switch so that arm 350 contacts terminal 370 and arm 380 contacts terminal 400. Diode 342 is an inductance suppressor for the winding. With the relay arms thus switched, positive potential, coupled from battery 20, is removed from contact 360 and from bus 470. This removes positive potential from bus 130 and disables the signal module 90. Removing positive potential from bus 470 also turns off lamps 324 of templates 321 throughout the premises. At the same time, positive potential from battery 20 is coupled over switches S1 and bus 430 through arm 380 and contact 400 to bus 326. This causes lamps 322 to light and indicate that alarm module 90 is disabled. However, if a switch S1 is opened, lamps 322 do not light.
Resistor 410 is provided to prevent racing of the relay contacts of relay 330. If arm 380 switches off contact 390 before arm 350 switches to contact 370, a false alarm could occur. Resistor 410 maintains positive potential on bus 420 to prevent this happening.
Reference is now made to exit door 480 and its portion of the system. Before leaving the premises at night and before opening the exit door, switch 510 is closed with a key. This couples negative potential from battery 20 over leads 23, 150 and 630 and closed switch 510 and lead 590 to end 534 of winding 530 of relay 520. Positive potential is applied to the other end of the winding 530 from battery 20 over leads 570 and 563, and the resultant current flow through the winding 530 switches arm 560 from contact 550 to contact 540. This action removes negative potential from bus 170 to SUS 110 of the signal module 90. Now, if the door 480 is opened and door switch 490 is closed, nothing happens in the circuit 90. Switch 510 can be opened by removing the operating key. If now, door 480 is closed, switch 490 opens, and negative potential is removed from winding 530 and arm 560 returns to contact 550 to re-arm SUS 110.
Now, when the premises are opened, for example in the morning, if the premises are a business location, and door 480 is opened to close switch 490, this couples negative potential from battery 20, leads 150 and 630, closed switch 490, bus 640, arm 560 and contact 550 and bus 170 to the gate G of SUS 100. This fires SUS 100 and current flows into the charging circuit associated with UJT 210 and SCR 280. The actual firing of the UJT is delayed by the charging circuit, and this permits an authorized individual time to close switch 510 with his key. This again operates the relay 520 to remove potential from the gate of SUS 100 and to prevent the alarm 30 from being fired. It is noted that lamp 500 turns on when the winding 530 conducts to operate relay 520 to represent disabling of SUS 100.
Referring now to the fire alarm portion 790 of the system, negative potential from battery 20 is coupled thereto over bus 150 and positive potential is coupled from the battery through buses 570 and 670 and closed switch 780 to bus 783. The potentiometer 850 is adjusted to insure that a negative potential is not applied to the gate of SUS 860 which would cause it to turn on. If the potentiometer 850 is adjusted to set meter 930 at center scale, the meter will indicate the condition of battery 20, as well as indicate a complete loop for the fire alarm circuit.
When a fire closes one of the thermostats 810, potentiometer 850 is shorted out of the circuit, and this causes a negative potential, or near ground potential, to appear on the gate G of SUS 860. SUS 860 then conducts and applies a positive pulse on bus 863 from the cathode of SUS 860 to the gate of SCR 870 which conducts and causes the fire bell 940 to ring. Opening switch 780 disconnects positive potential from the fire alarm circuit and resets the circuit and the thermostats.
Burglar and fire alarm systems are well known in the art; however, none is as inexpensive to operate or as versatile in the number of functions which can be performed as is the present invention.
SUMMARY OF THE INVENTION
Briefly, the invention comprises a burglar-fire system which includes interrelated burglar and fire alarm operating modules and auxiliary operating adjuncts therefor.
DESCRIPTION OF THE DRAWING
The single FIGURE is a schematic representation of an electronic system embodying the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The system of the invention 10 includes a primary power source such a battery 20 which provides power for the entire system which includes a burglar alarm portion and a fire alarm portion. The burglar alarm portion includes a signaling device such as an electromagnetic bell or horn 30 having an associated filter circuit 40 which, in a preferred construction, includes a diode 50, oriented as shown across the horn, and parallel wire coils 60 and 70, one copper and one silver, progressively universal wound. Coil 70 has one end connected to one end of the horn 30, and coil 60 has its opposite end connected to the other end of the horn. A second diode is connected, oriented as shown, between opposite ends of the coils. Preferably, the arrangement is anodes of the diodes to the silver wire and cathodes of the diodes to the copper wire. This filter eliminates the high positive spikes which might be generated with a magnetic bell or horn due to induced magnetic fields and systeresis effects.
The burglar alarm portion of the invention includes a signal module 90 shown enclosed in dash lines for generating an alarm signal which can be coupled to a remote receiver, for example, at a police station. This module is shown and described in U.S. Pat. No. 3,603,947 and includes two semiconductor switches 100 and 110, for example, G. E. Type 4987 silicon unilateral switches. These SUS devices are planar, monolithic, integrated circuits having thyristor electrical characteristics closely approximating those of an ideal four-layer diode. SUS switch 100 has its anode A connected through resistor 120 to a positive bus 130 and its gate G connected through a resistor 140 to a negative bus 150. The switch 110 has its anode A connected to positive bus 130 and its gate G connected (1) through a resistor 153 to the positive bus 130, and (2) through a resistor 160 to bus 170 and thence to a relay 520 to be described. The cathode K of SUS switch 100 is connected to a bus 180, and the cathode K of SUS switch 110 is connected (1) through a resistor 190 to one emitter 200 of a unijunction transistor (UJT) 210, and (2) through a resistor 220 to the slider 223 and to one end of a potentiometer 230, the other end of the potentiometer being connected (1) to the emitter 240 of the unijunction transistor 210 and (2) through a capacitor 250 to the negative bus 150.
The second base 260 of the unijunction transistor is connected by lead 262 to bus 180, and this junction point 264 is connected through a resistor 270 to bus 150. The second base 260 of the unijunction transistor 210 is also connected to the gate of silicon controlled rectifier SCR 280, the cathode of which is connected to negative bus 150, and the anode of which is connected (1) through resistor 290 to positive bus 130, and (2) by lead 300 to the cathode of diode 80 of the filter 40. Lead 300 from the anode of SCR 280 is connected by lead 310 to a suitable remote signal or alarm circuit 320, as shown in the aforementioned patent.
The positive bus 130 is connected to the anode of diode 80 and to the associated end of winding 70 of filter 40.
The burglar alarm system includes a plurality of light and switch templates 321 dispersed throughout the premises and each including a lamp 322, a switch 323, and a lamp 324. One end of each of these elements is connected to a bus 325, and the other end of each lamp 322 is connected to bus 326, the other end of each switch 323 is connected to bus 327, and the other end of each lamp 324 is connected to a bus 328. The switches 323 are preferably key-operable by an occupant of the premises.
The burglar alarm portion also includes a single pole, double throw relay 330 including a winding 340 with a diode 342 across it, an armature 350, and two contacts 360 and 370 (armature 350 is normally closed on contact 360), and armature 380 and two contacts 390 and 400 (armature 380 is normally closed on contact 390). Armature 380 is connected (1) through a resistor 410 to a lead 420 which extends from contact 390 to the gate of SUS 100, and (2) through lead 430 to a series of normally closed switches S1 and finally through lead 440 to bus 450 which extends from the positive terminal of battery 20. Switches S1 represent burglar sensing elements dispersed throughout the premises being protected, and associated with windows, doors, and the like represented by numeral 455, and they may be mechanical switches, ultrasonic devices, infrared devices, or the like. Contact 400 is connected to lead 326 associated with lamps 322 of templates 321.
Referring again to relay 330, armature 350 is connected by lead 460 to bus 450 and thus to the positive terminal of battery 20, and contact 360 is connected by lead 470 to positive bus 130 and to bus 326 connected to one side of each lamp 324 of templates 321 which are dispersed throughout the premises. The cathode of diode 342 and end 343 of the winding 340 are connected to bus 329 to switches 323 of templates 321. The other end 345 of the winding 340 and the anode of diode 342 are connected to bus 450 and to the positive terminal of battery 20.
The burglar alarm portion also includes a circuit portion associated with an entry and exit door 480 to the premises. This circuit portion includes a switch 490 associated with the door 480 and adapted to close when the door is opened and open when the door is closed. This portion of the system also includes (1) a lamp 500 and a normally-open, key-operated switch 510 connected together at one end, 501 and 511, respectively, and (2) a relay 520 including a winding 530 paralleled by diode 533, two contacts 540 and 550, and an armature 560 which is normally closed on contact 550. One end 532 of winding 530 is connected (1) by leads 563 and 570 to positive power bus 450, and (2) by lead 580 to end 503 of lamp 500. The connected ends 501 and 511 of lamp 500 and switch 510, respectively, are connected by lead 590 to commonly connected end 534 of winding 530, the cathode of diode 533, and contact 540 of relay 520. The other end 513 of switch 510 is connected (1) by lead 600 to the armature 610 of door switch 490, and (2) by lead 630 to bus 150. The other contact 620 of door switch 490 is connected by lead 640 to the armature 560 of relay 520. Contact 550 of relay 520 is connected to lead 170 which is connected through resistor 160 to the gate of SUS 110 of signal module 90.
The burglar alarm portion of the system also includes a "panic" module 640 which comprises two silicon controlled rectifiers (SCRs) 650 and 660 having their anodes connected together and then coupled (1) to bus 570 and thence to bus 450 connected to the positive terminal of battery 20, and (2) to bus 670. The cathode of SCR 650 is connected (1) by lead 680 to positive bus 130, and (2) through resistor 690 to its gate and through a diode 700, oriented as shown, to the gate of SCR 660. The cathode of SCR 660 has its cathode connected (1) through resistor 710 to bus 180 (to the cathode of SUS 100) and (2) through resistor 720 to its gate and through resistor 730 to bus 740. Between bus 740 and bus 750 (from bus 670) are connected a plurality of normally-open panic switches which are distributed throughout the premises.
As noted, the anodes of SCR 650 and SCR 660 are connected together to lead 670 which is connected to one terminal 770 of normally-closed switch 780, the armature 784 of which is connected by lead 783 to the fire alarm portion 790 of system 10. The fire alarm portion 790 includes an alarm section 800, a series of sensors 810, and a signal-generating portion 820. The sensors 810 are elements, such as thermostats, disposed throughout the premises, and connected between buses 830 and 840 which are terminated by a high resistance potentiometer 850.
The signal-generating portion 820 of the fire alarm portion of the system 10 includes a semiconductor switch, for example, a silicon unilateral switch (SUS) 860 and a silicon controlled rectifier SCR 870. The gate G of SUS 860 is connected (1) through a resistor 880 to bus 783 and (2) to lead 840 to the sensors 810. The anode A of SUS 860 is connected through a resistor 890 to bus 783, and the cathode K of SUS 860 is connected by lead 863 (1) to the gate of SCR 870 and (2) through a resistor 900 to a junction point 910, to which bus 150 and the cathode of SCR 870 are connected. The junction point 910 is also connected through resistor 920 and a voltmeter 930 to bus 830 to the remote sensors 810.
The alarm portion 800 of the fire alarm system also includes an alarm such as an electromagnetic bell or horn 940, having a different characteristic sound than alarm 30, connected to a filter 950 which is similar in construction to the filter 40 associated with alarm 30 and includes diodes 960 and 970 and coils 980 and 990 interconnected as shown.
Operation of the burlgar alarm portion of the system 10 depends on signal-generating module 90 to sense alarm situations represented by switches S1 and to generate an appropriate signal. With relay 330 set to its normal state, as illustrated in the drawing, positive potential appears on the bus 130 from the battery 20 to lead 460, armature 350, contact 360 and lead 470. Thus, the signal module 90 is armed and operable. In addition, positive potential runs from lead 470 to lead 328 which is connected to lamps 324 which have their bus 325 connected to negative potential. Thus, lamps 324 light and represent normal status and operability of the signal module 90.
If one of the alarm sensors, represented by switches S1, is triggered, this action being represented by the opening of a switch S1, positive potential is removed from the gate of SUS 100 which thereby conducts and applies a positive pulse to the gate of SCR 280 which then conducts. Conduction of SCR 280 sends a signal to remote circuit 320, and it turns on alarm or horn 30.
Referring to the panic circuit 640, closure of one of the panic switches 760, by an individual on the premises, couples positive potential from battery 20 through leads 570, 670, and 750 and through resistor 730 to the gate of SCR 660. SCR 660 will now conduct and apply a positive pulse through resistor 710 and lead 180 to the cathode of SUS 100 which will conduct and turn on alarm 30, as described above.
If, for some reason, module 90 is disarmed, for example, if there is no positive potential on bus 130, then firing of SCR 660 of the panic module 640 conducts a positive pulse through diode 700 to the gate of SCR 650 which is fired to apply a positive potential to bus 130. This now permits SUS 100 to fire and operate the alarm 30.
Turning off of the signal module 90 is referred to above and can be accomplished by closing one of the switches 323 associated with the templates 321. When one of these switches is closed, negative potential is coupled from battery 20 over bus 23 and bus 150 to bus 325 to bus 327 to end 343 of winding 340 of relay 330. Current now flows through the winding 340 and causes the arms 350 and 380 thereof to switch so that arm 350 contacts terminal 370 and arm 380 contacts terminal 400. Diode 342 is an inductance suppressor for the winding. With the relay arms thus switched, positive potential, coupled from battery 20, is removed from contact 360 and from bus 470. This removes positive potential from bus 130 and disables the signal module 90. Removing positive potential from bus 470 also turns off lamps 324 of templates 321 throughout the premises. At the same time, positive potential from battery 20 is coupled over switches S1 and bus 430 through arm 380 and contact 400 to bus 326. This causes lamps 322 to light and indicate that alarm module 90 is disabled. However, if a switch S1 is opened, lamps 322 do not light.
Resistor 410 is provided to prevent racing of the relay contacts of relay 330. If arm 380 switches off contact 390 before arm 350 switches to contact 370, a false alarm could occur. Resistor 410 maintains positive potential on bus 420 to prevent this happening.
Reference is now made to exit door 480 and its portion of the system. Before leaving the premises at night and before opening the exit door, switch 510 is closed with a key. This couples negative potential from battery 20 over leads 23, 150 and 630 and closed switch 510 and lead 590 to end 534 of winding 530 of relay 520. Positive potential is applied to the other end of the winding 530 from battery 20 over leads 570 and 563, and the resultant current flow through the winding 530 switches arm 560 from contact 550 to contact 540. This action removes negative potential from bus 170 to SUS 110 of the signal module 90. Now, if the door 480 is opened and door switch 490 is closed, nothing happens in the circuit 90. Switch 510 can be opened by removing the operating key. If now, door 480 is closed, switch 490 opens, and negative potential is removed from winding 530 and arm 560 returns to contact 550 to re-arm SUS 110.
Now, when the premises are opened, for example in the morning, if the premises are a business location, and door 480 is opened to close switch 490, this couples negative potential from battery 20, leads 150 and 630, closed switch 490, bus 640, arm 560 and contact 550 and bus 170 to the gate G of SUS 100. This fires SUS 100 and current flows into the charging circuit associated with UJT 210 and SCR 280. The actual firing of the UJT is delayed by the charging circuit, and this permits an authorized individual time to close switch 510 with his key. This again operates the relay 520 to remove potential from the gate of SUS 100 and to prevent the alarm 30 from being fired. It is noted that lamp 500 turns on when the winding 530 conducts to operate relay 520 to represent disabling of SUS 100.
Referring now to the fire alarm portion 790 of the system, negative potential from battery 20 is coupled thereto over bus 150 and positive potential is coupled from the battery through buses 570 and 670 and closed switch 780 to bus 783. The potentiometer 850 is adjusted to insure that a negative potential is not applied to the gate of SUS 860 which would cause it to turn on. If the potentiometer 850 is adjusted to set meter 930 at center scale, the meter will indicate the condition of battery 20, as well as indicate a complete loop for the fire alarm circuit.
When a fire closes one of the thermostats 810, potentiometer 850 is shorted out of the circuit, and this causes a negative potential, or near ground potential, to appear on the gate G of SUS 860. SUS 860 then conducts and applies a positive pulse on bus 863 from the cathode of SUS 860 to the gate of SCR 870 which conducts and causes the fire bell 940 to ring. Opening switch 780 disconnects positive potential from the fire alarm circuit and resets the circuit and the thermostats.