WO2004047035A1 - Improvements in or relating to an alarm system for glass panes - Google Patents
Improvements in or relating to an alarm system for glass panes Download PDFInfo
- Publication number
- WO2004047035A1 WO2004047035A1 PCT/SE2003/001788 SE0301788W WO2004047035A1 WO 2004047035 A1 WO2004047035 A1 WO 2004047035A1 SE 0301788 W SE0301788 W SE 0301788W WO 2004047035 A1 WO2004047035 A1 WO 2004047035A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- electric loop
- alarm
- circuit
- loop
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/04—Mechanical actuation by breaking of glass
Definitions
- the present invention refers to improvements in or relating to an alarm system for glass panes, which comprises a voltage converter connected to any form of electronic loop, which is connected to at least one glass pane, said voltage converter is galvanically disconnecting the electronic loop from other electronic components, whereby earth faults cannot give rise to faulty or false alarms.
- a glass pane such as hardened glass, float glass, decorative glass in the form of single-ply glass, lamellar glass, thermopane or combinations of these, that are installed in a building or other enclosed space such as a display box, is forced or breaks.
- An electrically conducting circuit is normally used on a hardened glass pane, which circuit is applied at some position on a glass pane, preferably at its surfaces that lie closest to the edge of the glass pane.
- the circuit is connected to an electric loop, to which a voltage is applied when the loop is connected to a control unit and/or directly to central equipment that identifies alarms when the circuit is broken, whereby the value of the resistance becomes large.
- An object of the present invention is to eliminate the disadvantages that are present for the designs described above by connecting a voltage converter, which provides galvanic insulation between the electric loop and the central unit and other electronic components, and by the use of different balanced loops in order to reduce the possibility of sabotage and manipulation of the alarm system, and in this way to increase the degree of security.
- the electric loop with its component circuits is connected, according to the invention in its simplest construction, to a voltage converter, which is galvanically insulated from the central unit and from other electronic components, whereby earth faults in the electric loop do not arise.
- a voltage converter consists of a circuit connected to a transformer, where inputs and outputs are insulated from each other. The voltage converter supplies a voltage to the electric loop.
- the electric loop is designed, in one preferred embodiment of the invention, as a balanced loop, which is connected to the voltage converter, which is integrated into a control unit, whereby the electric loop is placed in galvanic insulation from other electronic components.
- a resistor is connected to the ends of each circuit and a resistor in the form of a terminating resistor is connected into the electric loop after the final glass pane, whereby the electric loop always has, in its normal condition, a certain value of resistance. If several glass panes are used, they are connected in series.
- the balanced electric loop is provided in a second preferred embodiment of the invention with four cables of the same colour, which are attached to the glass pane, two of which are connected to the circuit, and the other two of which are connected together somewhere at or in association with the glass pane. It will be difficult to distinguish between these four cables during sabotage, since there are several cables of the same colour to choose between. If the wrong cables are chosen, this is indicated in the control unit, which is able to indicate various conditions in an alarm window, that is, various values of resistance from the electric loop are indicated, that the alarm system is in under different situations, depending on whether it is in its normal condition or exposed to sabotage or to an actual break-in.
- the value of the resistance is normal, i.e. it has the correct value, whereby this is made clear in the alarm window. If the alarm circuit is broken, as it will be if the glass pane is subject to an actual break-in, in which the glass pane is broken such that the circuit is broken, the value of the resistance increases, whereby the alarm is given. This will also occur in the event of manipulation. In this case the resistance decreases or increases, and this causes the alarm to start. If the electric loop is cut, the resistance increases to a maximum value, and if it is short-circuited the resistance decreases to zero, something that is also indicated in the control unit.
- the greatest advantage of the invention thus, is that the alarm cannot start in the event of an earth fault, since earth faults do not occur. Furthermore, if balanced electric loops are used, the degree of security is increased, whereby it will be very difficult to manipulate and sabotage the alarm system. Furthermore, the invention will be easy to install. Furthermore, it has low maintenance costs, since it is, as has been described, not very easy to cause false alarms, whereby unnecessary call-out costs are significantly reduced.
- Fig. 1 shows a block diagram of a first variant of the invention in the form of a resting current loop
- Fig. 2 shows a block diagram of a second variant of the invention in the form of a balanced loop
- Fig. 3 shows a block diagram of a third variant of the invention in the form of a balanced loop with several cables of the same colour that are attached to the glass pane.
- FIG. 1 a block diagram of the alarm system 1 in its simplest design without resistors according to the invention.
- An electric loop 2 in the form of a resting current loop, is connected to a voltage converter 3, whereby the electric loop 2 is galvanically insulated from the central unit and from the other electronic components, whereby earth faults in the electric loop 2 are not registered.
- Circuits 8 are included in the electric loop 2, which loops are attached to the glass panes 4. In the event of a forcement of the glass pane 4, a breakage of the circuit 8 arises, whereby an alarm is started.
- An output 11 is connected to the central unit in the form of an alarm output 14, which displays alarm on the central unit.
- the central unit and the voltage converter are provided with supply voltage 15.
- an electric loop 2 is shown with a resistor 7 in the form of a terminating resistor 5 that is connected after the final glass pane 4 and a resistor 7 is connected at the ends of the circuit 8 at each glass pane 4, such that the voltage is measured through the resistor 7 when the circuit is broken, whereby the value of the resistance increases and the alarm is started.
- the electric loop 2 is connected to the voltage converter 3 of the control unit 6, whereby the electric loop 2 is galvanically insulated from the central unit and from the other electronic components.
- An alarm window 10 is used in this embodiment. Since the electric loop is balanced, three conditions are to be indicated, which means that the normal condition 12 indicates that the value of resistance in the conductive loop 2 is normal.
- An alarm condition 13 in the alarm window 10 indicates that the circuit 8 is broken, whereby the value of the resistance increases.
- the value of the resistance decreases, and this is indicated as a sabotage condition 16.
- the alarm window 10 indicates also this as a sabotage condition 16, since the value of the resistance becomes a minimum.
- Sabotage is also indicated when the electric loop 2 is broken close to the control unit 6, since the resistance then becomes a maximum.
- Two outputs 11 are required in this embodiment: an alarm output 14 and a sabotage output 17, which are connected to the central unit and which also indicates this.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Surface Treatment Of Glass (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The present invention refers to an improvement in or relating to an alarm system (1) attached to at least one glass pane (4) and which comprises at least one circuit (8) for each glass pane (4) such as hardened glass, float glass, decorative glass in the form of, for example, single-ply glass, lamellar glass, thermopane or combinations of these, where polycarbonate and PVB foil in the lamellar glass can also be included, which circuit (8) is connected to at least one electric loop (2), which has a voltage applied across it, where by an alarm is started when the value of resistance in the electric loop (2) is changed, whereby the electric loop (2) with the circuit (8) is connected to at least one electrical voltage converter (3), which provides galvanic insulation between the electric loop (2) including the circuits (8) and the other electronic components.
Description
Improvements in or relating to an alarm system for glass panes .
The present invention refers to improvements in or relating to an alarm system for glass panes, which comprises a voltage converter connected to any form of electronic loop, which is connected to at least one glass pane, said voltage converter is galvanically disconnecting the electronic loop from other electronic components, whereby earth faults cannot give rise to faulty or false alarms.
Designs available on the market of the actual type are today usig various alarm systems in order to start an alarm if a glass pane such as hardened glass, float glass, decorative glass in the form of single-ply glass, lamellar glass, thermopane or combinations of these, that are installed in a building or other enclosed space such as a display box, is forced or breaks. An electrically conducting circuit is normally used on a hardened glass pane, which circuit is applied at some position on a glass pane, preferably at its surfaces that lie closest to the edge of the glass pane. The circuit is connected to an electric loop, to which a voltage is applied when the loop is connected to a control unit and/or directly to central equipment that identifies alarms when the circuit is broken, whereby the value of the resistance becomes large. The problem with these alarm systems is that at some location in the electric loop, preferably in the circuit on the glass pane, a leakage current to earth often arises, i.e. a resistance arises, whereby the central equipment indicates this,
whereby the alarm is started despite this being a false alarm. All that is required is that a little moisture somewhere on the electric loop conducts current away to earth for the resistance to be altered and start an alarm, whereby the circuit itself is most exposed to be attacked by moisture. This can, naturally, also take place if the circuit in another way causes contact with earth without moisture conducting away the current. It only requires a few false alarms in order to create diminished trust in such an alarm system, which, it is clear, gives false alarms far too easily and far too often, and in this way causes unnecessary calling of security personnel, something that also creates considerable extra expense. Most of the central equipment that is used on the market indicates the slightest earth fault, which means that false alarms are a particularly serious problem for alarm systems of the type described above. Another problem for these alarm systems is that it is easy to manipulate them by short-circuiting the electric loop. It is, of course, the intention that the alarm shall start when the glass pane is forced, whereby the circuit is to be broken when the glass pane breaks such that the circuit is broken, whereby the resistance in the electric loop rises significantly. However, if the electric loop is short-circuited at some location, no rise in resistance occurs when the circuit is broken, whereby a break-in can take place and the glass pane can be forced without the alarm being started .
An object of the present invention is to eliminate the disadvantages that are present for the designs described above by connecting a voltage converter, which provides galvanic insulation between the electric loop and the central unit and other electronic components, and by the use of different balanced loops in order to reduce the possibility of sabotage and manipulation of the alarm system, and in this way to increase the degree of security.
Thanks to the invention an alarm system has now been provided, in which false alarms due to earth faults in the electric loop do not occur. Furthermore, it is possible according to the invention also to increase the level of security by the use of different balanced electric loops. The electric loop with its component circuits, is connected, according to the invention in its simplest construction, to a voltage converter, which is galvanically insulated from the central unit and from other electronic components, whereby earth faults in the electric loop do not arise. Such a voltage converter consists of a circuit connected to a transformer, where inputs and outputs are insulated from each other. The voltage converter supplies a voltage to the electric loop. It is possible, however, to manipulate this simple design of the invention by short-circuiting the electric loop at some location, whereby the glass pane still can be" forced without the alarm being started. Therefore, the electric loop is designed, in one preferred embodiment of the invention, as a balanced loop, which is connected to the voltage
converter, which is integrated into a control unit, whereby the electric loop is placed in galvanic insulation from other electronic components. A resistor is connected to the ends of each circuit and a resistor in the form of a terminating resistor is connected into the electric loop after the final glass pane, whereby the electric loop always has, in its normal condition, a certain value of resistance. If several glass panes are used, they are connected in series. In order to raise further the security of the alarm system according to the invention, the balanced electric loop is provided in a second preferred embodiment of the invention with four cables of the same colour, which are attached to the glass pane, two of which are connected to the circuit, and the other two of which are connected together somewhere at or in association with the glass pane. It will be difficult to distinguish between these four cables during sabotage, since there are several cables of the same colour to choose between. If the wrong cables are chosen, this is indicated in the control unit, which is able to indicate various conditions in an alarm window, that is, various values of resistance from the electric loop are indicated, that the alarm system is in under different situations, depending on whether it is in its normal condition or exposed to sabotage or to an actual break-in. This can also be transmitted to the central unit through outputs on the control unit. When conditions are normal, and everything is as it should be, the value of the resistance is normal, i.e. it has the correct value, whereby this is
made clear in the alarm window. If the alarm circuit is broken, as it will be if the glass pane is subject to an actual break-in, in which the glass pane is broken such that the circuit is broken, the value of the resistance increases, whereby the alarm is given. This will also occur in the event of manipulation. In this case the resistance decreases or increases, and this causes the alarm to start. If the electric loop is cut, the resistance increases to a maximum value, and if it is short-circuited the resistance decreases to zero, something that is also indicated in the control unit. The greatest advantage of the invention, thus, is that the alarm cannot start in the event of an earth fault, since earth faults do not occur. Furthermore, if balanced electric loops are used, the degree of security is increased, whereby it will be very difficult to manipulate and sabotage the alarm system. Furthermore, the invention will be easy to install. Furthermore, it has low maintenance costs, since it is, as has been described, not very easy to cause false alarms, whereby unnecessary call-out costs are significantly reduced.
The invention will be described in more detail below with the aid of some preferred embodiment examples with reference to the attached drawings, where :
Fig. 1 shows a block diagram of a first variant of the invention in the form of a resting current loop,
Fig. 2 shows a block diagram of a second variant of the invention in the form of a balanced loop ,
Fig. 3 shows a block diagram of a third variant of the invention in the form of a balanced loop with several cables of the same colour that are attached to the glass pane.
As Fig. 1 makes clear, there is shown a block diagram of the alarm system 1 in its simplest design without resistors according to the invention. An electric loop 2, in the form of a resting current loop, is connected to a voltage converter 3, whereby the electric loop 2 is galvanically insulated from the central unit and from the other electronic components, whereby earth faults in the electric loop 2 are not registered. Circuits 8 are included in the electric loop 2, which loops are attached to the glass panes 4. In the event of a forcement of the glass pane 4, a breakage of the circuit 8 arises, whereby an alarm is started. An output 11 is connected to the central unit in the form of an alarm output 14, which displays alarm on the central unit. The central unit and the voltage converter are provided with supply voltage 15.
As is made clear by the embodiment example of the invention that is shown in Fig. 2, an electric loop 2 is shown with a resistor 7 in the form of a terminating resistor 5 that is connected after the final glass pane 4 and a resistor 7 is connected
at the ends of the circuit 8 at each glass pane 4, such that the voltage is measured through the resistor 7 when the circuit is broken, whereby the value of the resistance increases and the alarm is started. The electric loop 2 is connected to the voltage converter 3 of the control unit 6, whereby the electric loop 2 is galvanically insulated from the central unit and from the other electronic components. An alarm window 10 is used in this embodiment. Since the electric loop is balanced, three conditions are to be indicated, which means that the normal condition 12 indicates that the value of resistance in the conductive loop 2 is normal. An alarm condition 13 in the alarm window 10 indicates that the circuit 8 is broken, whereby the value of the resistance increases. When the electric loop 2 is subject to breakage in the vicinity of the glass pane 4, the value of the resistance decreases, and this is indicated as a sabotage condition 16. If the electric loop 2 is short-circuited close to the control unit 6, the alarm window 10 indicates also this as a sabotage condition 16, since the value of the resistance becomes a minimum. Sabotage is also indicated when the electric loop 2 is broken close to the control unit 6, since the resistance then becomes a maximum. Two outputs 11 are required in this embodiment: an alarm output 14 and a sabotage output 17, which are connected to the central unit and which also indicates this.
As is made clear by the embodiment of the invention that is shown in Fig. 3, it is similar to that shown in Fig. 2 with the difference that
the electric loop 2 takes a route 18 towards the glass pane 4 without being electrically broken and having the same colour as the cables 9 which are connected to the circuit 8, whereby it will be more difficult to sabotage the alarm system 1.
Claims
1. An improvement in an alarm system (1), which is attached to at least one glass pane (4) and which comprises at least one circuit (8) for each glass pane (4) such as hardened glass, float glass, decorative glass in the form of, for example, single-ply glass, lamellar glass, thermopane or combinations of these, where polycarbonate and PVB foil in the lamellar glass can also be included, said circuit (8) being connected to at least one electric loop (2) , which has a voltage applied across it, whereby an alarm is started when the value of resistance in the electric loop (2) is changed, characterized in that the electric loop (2) with the circuit (8) is connected to at least one electrical voltage converter (3) , which provides galvanic insulation between the electric loop (2) including the circuits (8) and other electronic components .
2. An improvement according to claim 1, characterized in that the voltage converter (3) is integrated into a control unit (6), which continually reads the value of resistance in the electrically conducting loop (2), and which indicates this value and determines the cause of an alarm, whereby alarm is started from the control unit (6) and/or this information is transferred to the central unit.
3. An improvement according to claim 1, characterized in that at least one circuit (8) is connected in parallel with at least one resistor (7), whereby the voltage is applied across the resistor (7) instead of the circuit
(8) if this is broken, whereby the value of resistance in the electrical loop (2) increases.
An improvement according to claim 1, characterized in that at least one resistor ( 7 ) /terminating resistor (5) is connected at some location in the electric loop (2) after the final glass pane (4), whereby the electric loop (2) in its normal condition (12) always has a certain value of resistance.
An improvement according to claim 1, characterized in that the electric loop (2) comprises at least four cables (9) with the same colour, which are connected to the glass pane (4), two of which cables are connected to the circuit (8) and the other two of which cables are connected together at some location at the glass pane ( 4 ) .
An improvement according to claim 2, characterized in that the control unit (6) comprises an alarm window (10), which indicates normal condition (12), and alarm condition (13), and furthermore indicates sabotage condition (16), when the electric loop (2) is a balanced loop with at least one resistor (7) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003302091A AU2003302091A1 (en) | 2002-11-19 | 2003-11-18 | Improvements in or relating to an alarm system for glass panes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0203448-6 | 2002-11-19 | ||
| SE0203448A SE0203448D0 (en) | 2002-11-19 | 2002-11-19 | Device for an alarm system for glass panes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004047035A1 true WO2004047035A1 (en) | 2004-06-03 |
Family
ID=20289639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2003/001788 WO2004047035A1 (en) | 2002-11-19 | 2003-11-18 | Improvements in or relating to an alarm system for glass panes |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2003302091A1 (en) |
| SE (1) | SE0203448D0 (en) |
| WO (1) | WO2004047035A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1389009A (en) * | 1971-05-04 | 1975-04-03 | Emi Ltd | Theft alarm systems |
| SU824245A1 (en) * | 1977-12-26 | 1981-04-23 | Всесоюзный Научно-Исследовательскийинститут Противопожарной Обороны | Intruder alarm |
| FR2497980A1 (en) * | 1981-01-14 | 1982-07-16 | Ruffini Pierre Dominique | Glass breakage detector for burglar alarm - comprises conductor of known resistance adhering to surface of glass |
| DE3830265C1 (en) * | 1988-09-06 | 1990-01-18 | Alfasystem Gmbh, 8034 Germering, De | Glass break detector (sensor) |
| DE3909814A1 (en) * | 1989-03-24 | 1990-10-04 | Manfred Stueckroth | Glass-break alarm device for monitoring window panes |
-
2002
- 2002-11-19 SE SE0203448A patent/SE0203448D0/en unknown
-
2003
- 2003-11-18 WO PCT/SE2003/001788 patent/WO2004047035A1/en not_active Application Discontinuation
- 2003-11-18 AU AU2003302091A patent/AU2003302091A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1389009A (en) * | 1971-05-04 | 1975-04-03 | Emi Ltd | Theft alarm systems |
| SU824245A1 (en) * | 1977-12-26 | 1981-04-23 | Всесоюзный Научно-Исследовательскийинститут Противопожарной Обороны | Intruder alarm |
| FR2497980A1 (en) * | 1981-01-14 | 1982-07-16 | Ruffini Pierre Dominique | Glass breakage detector for burglar alarm - comprises conductor of known resistance adhering to surface of glass |
| DE3830265C1 (en) * | 1988-09-06 | 1990-01-18 | Alfasystem Gmbh, 8034 Germering, De | Glass break detector (sensor) |
| DE3909814A1 (en) * | 1989-03-24 | 1990-10-04 | Manfred Stueckroth | Glass-break alarm device for monitoring window panes |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Week 198205, Derwent World Patents Index; Class W05, AN 1982-B1880E * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003302091A1 (en) | 2004-06-15 |
| SE0203448D0 (en) | 2002-11-19 |
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