EP0087076B1 - Grate with incorporated alarm system - Google Patents
Grate with incorporated alarm system Download PDFInfo
- Publication number
- EP0087076B1 EP0087076B1 EP83101279A EP83101279A EP0087076B1 EP 0087076 B1 EP0087076 B1 EP 0087076B1 EP 83101279 A EP83101279 A EP 83101279A EP 83101279 A EP83101279 A EP 83101279A EP 0087076 B1 EP0087076 B1 EP 0087076B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grate
- conductors
- alarm
- circuit
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
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
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/01—Grilles fixed to walls, doors, or windows; Grilles moving with doors or windows; Walls formed as grilles, e.g. claustra
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
Definitions
- the present invention relates to a metal grate, usually made of steel, which contains a series of incorporates devices, which, in the case of tampering, will activate the alarm system being connected to. them.
- grates usually built of steel and in different shapes, are barriers being secured in the openings of walls, such as windows, or transition areas between one room and the next, in order to permanently prevent people from entering into reserved or forbidden rooms, or, as in the case of jails, in order to prevent escapes through the openings being protected by these grates.
- the grates are firmly secured in the walls by means of cementing or by means of similar systems and they constitute in themselves a barrier of the passive type, that is, they oppose by means of their structure and their type of anchorage possible tampering or attempted force.
- Grates equipped with an electric alarm system which is triggered when the bars constituting the grate are sawn are also known.
- US-A-2,374,139 describes a grate constituted by bars, each consisting of an internal and an external tube being insulated the one from the other and being part of an electric circuit. When the bars are sawn, the saw causes the electric contact between the internal tube and the external one, thereby triggering the alarm signal.
- this system is effective only when the bars are sawn, while the alarm may not be activated when the grate undergoes tamperings of a different nature, such as the spreading apart of the bars or the partial tearing of the grate off the wall.
- the object of the present invention is that of realizing a grate, which, besides being a barrier of the passive type, is also an active means which prevents, becasuse of its constitution, any type of tampering, whether represented by the sawing of the bars, which constitute it, by their being forced apart, or by the tearing of the grate away from the anchoring wall.
- a grate with an incorporated alarm system includes a metal structure consisting in hollow bars being welded to each other; inside said bars and even inside the anchoring of the grate there are electric conductors which run longitudinally and transversally in the structure and are connected to an alarm system.
- each bar and each anchoring unit is strung with one or more pairs of conductors, one end of which is connected to a load resistance placed inside the structure, while the other end of the conductors is connected to an electronic balancing circuit, which detects any variation of resistance in the circuit.
- the head of this pivot is provided with a loop, through which the wires of the electric circuit or circuits are strung, so that a possible removal from the wall of the anchorage in which the pivot is inserted will also cause the tearing of the electric circuit, with the ensuing activation of the alarm.
- grate 1 is built of bars of structural steel, welded and hollow inside, so as to allow the passage of two pairs of electrical wires 2, 3 and 4, 5, each of which constitutes a closed circuit on a resistance, as shown in 6.
- Fig. 1 shows the route of the wires, which can be strung in any direction, even going through the same section several times, although it should be kept in mind that no area, including the anchorage, should be left without wiring.
- tube 8 made of plastic material, is placed inside of it; this tube goes all the way through the wall and serves as a channel for the introduction in the grate of the conductors being connected to the alarm station. It is blocked inside anchorage 7 by block 9, made of a gummy plastic material, which contacts the inside walls of the above-mentioned anchorage.
- anchorage 10 holds in its interior pivot 11, made of iron, which goes all the way through the wall and which has a threaded end 12 protruding from the anchorage. Plate 13 is screwed to protruding end 12 and then cemented in the wall. Pivot 11 is provided at the other end with loop 14, through which the electric conductors are strung. Two bolts, 15 and 16, prevent the rotation of pivot 11 while plate 13 is being fixed with screws.
- the anti-tear function of the pivot is obvious: in fact, in the case of an attempt to tear anchorage 10 from the wall, one also tears the conductors which are strung through the loop.
- inside anchorage 17 there is a block, made of plastic material, 18, which allows conductors 2, 3 and 4, 5 to wind around and continue to spread themselves in the horizontal and vertical sections of the grate.
- the inside of anchorage 19 also holds a block made of plastic material, for the reversing of the direction of the circuit wires, but inside the anchorage there is also the load resistance of one of the two circuits.
- Conductors 2, 3 and 4, 5 are normal, insulated electric conductors, but with a very small section, so that, because of their length, they constitute in themselves a resistive load, in addition to the load resistance.
- Each circuit is fed with low tension (12 Volts), so that possible contacts between the grate and the conductors can not be dangerous to people.
- Fig. 6 is a sketch of the circuit in blocks which connects the conductors contained in the grate to the alarm station.
- Resistances R1 and R2 represent respectively the resistive load of the two circuits 2, and 4, 5.
- Each of the two resistances is connected with a balancing circuit of a known type, which includes trimmer 20 having the task of balancing the connected load resistance, so that a transistorized circuit maintains relay 21 normally closed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
- Burglar Alarm Systems (AREA)
- Incineration Of Waste (AREA)
Abstract
Description
- The present invention relates to a metal grate, usually made of steel, which contains a series of incorporates devices, which, in the case of tampering, will activate the alarm system being connected to. them. One is reminded that grates, usually built of steel and in different shapes, are barriers being secured in the openings of walls, such as windows, or transition areas between one room and the next, in order to permanently prevent people from entering into reserved or forbidden rooms, or, as in the case of jails, in order to prevent escapes through the openings being protected by these grates.
- The grates are firmly secured in the walls by means of cementing or by means of similar systems and they constitute in themselves a barrier of the passive type, that is, they oppose by means of their structure and their type of anchorage possible tampering or attempted force.
- Grates equipped with an electric alarm system which is triggered when the bars constituting the grate are sawn , are also known. For instance, US-A-2,374,139, describes a grate constituted by bars, each consisting of an internal and an external tube being insulated the one from the other and being part of an electric circuit. When the bars are sawn, the saw causes the electric contact between the internal tube and the external one, thereby triggering the alarm signal. In actuality this system is effective only when the bars are sawn, while the alarm may not be activated when the grate undergoes tamperings of a different nature, such as the spreading apart of the bars or the partial tearing of the grate off the wall.
- Also, in DE-A-300 6999 a particular disposition of electric connections is described, which are suited for fencing safety systems, where the wires of the network belonging to a Wheatston bridge are connected to more copper wires, so as to avoid the possibility that the alarm may not be triggered if a bridge between the two wires is built.
- The object of the present invention is that of realizing a grate, which, besides being a barrier of the passive type, is also an active means which prevents, becasuse of its constitution, any type of tampering, whether represented by the sawing of the bars, which constitute it, by their being forced apart, or by the tearing of the grate away from the anchoring wall.
- This object is achieved by a grate having the features defined in
claim 1. - Basically, there is provided a grate with an incorporated alarm system and it includes a metal structure consisting in hollow bars being welded to each other; inside said bars and even inside the anchoring of the grate there are electric conductors which run longitudinally and transversally in the structure and are connected to an alarm system. According to the invention, each bar and each anchoring unit is strung with one or more pairs of conductors, one end of which is connected to a load resistance placed inside the structure, while the other end of the conductors is connected to an electronic balancing circuit, which detects any variation of resistance in the circuit. Therefore, whenever there is tampering at any point of the grate - which may consist in the sawing of the bars, in the drilling, in flame cutting, in the tearing from the wall or from the anchoring frame, in the forcing apart - a variation of resistance occurs, which may be due, for example, to a short-circuit or to an interruption of the circuit: this variation, detected by a balancing circuit of the resistance being applied to it, will cause in the circuit itself the opening of a relay which is connected to the burglar alarm station and will, therefore, activate the alarm. In order to increase the reliability of the functioning of the grate circuits, it was deemed advisable to introduce into it two circuits at least, one independent from the other, with equivalent functions and based on the same functional principle and on the same construction method. Particular attention has been paid to the solution of the problem concerning the pulling off of the grate, that is, the complete removal of the same from the anchoring wall or frame. For this reason at least one pair of anchorages and a pivot, preferably in a diagonal position, which goes completely through the wall and is anchored by means of an iron loop or cross on the other side of the grate, have been introduced. The head of this pivot is provided with a loop, through which the wires of the electric circuit or circuits are strung, so that a possible removal from the wall of the anchorage in which the pivot is inserted will also cause the tearing of the electric circuit, with the ensuing activation of the alarm.
- Another interesting aspect of the grate being discussed is that, because of the way in which it activates the alarm, false alarms due to accidental causes are practically impossible; in fact, if there is no alteration of the electric circuit in the grate, caused by the above-described causes, there will be no alarm.
- These and other characteristics and construction details will be better illustrated in the description of a preferred form of execution of the grate, which is given by way of indication, but which is not limiting and which is illustrated in the enclosed drawings, in which:
- - Fig. 1 shows the grate strung with the electric circuits;
- - Fig. 2 shows the anchorage, in which there is the entrance of the wires of the electric circuits introduced in the grate; Fig. 3 illustrates the anti-tear system of the anchorage with a pivot provided with a loop;
- - Fig. 4 shows the type of anchorage in which the wires of the circuit are wound once, in order to continue toward other areas; Fig. 5 shows an anchorage containing the end-of-the-line resistance of one of the circuits;
- - Fig. 6 sketches with a circuit in blocks the connection of the grate circuits with the alarm station.
- With reference to Fig. 1,
grate 1 is built of bars of structural steel, welded and hollow inside, so as to allow the passage of two pairs ofelectrical wires - Fig. 1 shows the route of the wires, which can be strung in any direction, even going through the same section several times, although it should be kept in mind that no area, including the anchorage, should be left without wiring.
- In the case being under examination there are 4 anchorages and each of them contains circuit structures and characteristics, which are different from one another.
- With reference to anchorage 7 (Fig. 2),
tube 8, made of plastic material, is placed inside of it; this tube goes all the way through the wall and serves as a channel for the introduction in the grate of the conductors being connected to the alarm station. It is blocked insideanchorage 7 by block 9, made of a gummy plastic material, which contacts the inside walls of the above-mentioned anchorage. - In Fig. 3,
anchorage 10 holds in itsinterior pivot 11, made of iron, which goes all the way through the wall and which has a threadedend 12 protruding from the anchorage.Plate 13 is screwed to protrudingend 12 and then cemented in the wall.Pivot 11 is provided at the other end withloop 14, through which the electric conductors are strung. Two bolts, 15 and 16, prevent the rotation ofpivot 11 whileplate 13 is being fixed with screws. The anti-tear function of the pivot is obvious: in fact, in the case of an attempt to tearanchorage 10 from the wall, one also tears the conductors which are strung through the loop. - In Fig. 4, inside
anchorage 17, there is a block, made of plastic material, 18, which allowsconductors anchorage 19 also holds a block made of plastic material, for the reversing of the direction of the circuit wires, but inside the anchorage there is also the load resistance of one of the two circuits. -
Conductors - Fig. 6 is a sketch of the circuit in blocks which connects the conductors contained in the grate to the alarm station. Resistances R1 and R2 represent respectively the resistive load of the two
circuits trimmer 20 having the task of balancing the connected load resistance, so that a transistorized circuit maintainsrelay 21 normally closed. - Each variation of the value of resistance R1 or R2 is felt by the balancing circuit which, consequently, causes the opening of
relay 21, which is connected toalarm station 22. The electric opening ofrelay 21 will cause the activation of the alarm. - In the specific case being described, two circuits have been foreseen. They are introduced into the grate, are independent from one another and are . represented by resistances R1 and R2, but it is obvious that a single circuit is sufficient for the functioning of the alarm system; on the other hand, it is also possible, for security reasons, to increase the number of circuits beyond two.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83101279T ATE17770T1 (en) | 1982-02-19 | 1983-02-10 | GRILLE WITH BUILT-IN ALARM SYSTEM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT85519/82A IT1193074B (en) | 1982-02-19 | 1982-02-19 | LATTICE WITH BUILT-IN ALARM SYSTEM |
IT8551982 | 1982-02-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0087076A1 EP0087076A1 (en) | 1983-08-31 |
EP0087076B1 true EP0087076B1 (en) | 1986-01-29 |
Family
ID=11327398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83101279A Expired EP0087076B1 (en) | 1982-02-19 | 1983-02-10 | Grate with incorporated alarm system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0087076B1 (en) |
AT (1) | ATE17770T1 (en) |
DE (1) | DE3361943D1 (en) |
IT (1) | IT1193074B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012120329A1 (en) * | 2011-03-10 | 2012-09-13 | De Villiers Marius De Wet | Alarmed intruder barrier |
ITRM20120302A1 (en) * | 2012-06-28 | 2013-12-29 | Saverio Santomassimo | PASSIVE PROTECTION SYSTEM FOR GRADES AND METAL AND NON-SHUTTER GATES AND METALLIC SHUTTERS AND NOT METALLIC AND NOT REFERED |
CN102839902B (en) * | 2012-08-03 | 2014-07-02 | 安徽科蓝智能技术有限公司 | Threading method for distributed resistance network anti-theft window |
CN104727719B (en) * | 2013-12-24 | 2016-06-08 | 苏州汇诚智造工业设计有限公司 | A kind of manufacture method of the guardrail modelled after an antique with warning box |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE367034C (en) * | 1923-01-16 | Johannes Henggi | Protective grille with alarm circuit closed when its crossbars move | |
US2374139A (en) * | 1941-07-03 | 1945-04-17 | Oliver L Schriner | Burglar alarm |
DE2653056C3 (en) * | 1976-11-23 | 1981-04-23 | Bochumer Eisenhütte Heintzmann GmbH & Co, 4630 Bochum | Protection device for the air passage areas of rooms or buildings |
DE2856819A1 (en) * | 1978-12-30 | 1980-07-17 | Wilhelm Tretschoks | Netting wire for safety fences - has conductive detecting wires in core surrounded by supporting wires and insulating sheath |
DE2925624A1 (en) * | 1979-06-26 | 1981-01-15 | Geiger Maschf Helmut | Safety bar screen for power stations - produces warning signal of any interference attempt by frogmen |
DE3006999A1 (en) * | 1980-02-25 | 1981-09-24 | Ernst 4200 Oberhausen Blaser | Circuit for security fence - has four wires forming arms of Wheatstone bridge to release alarm when short-circuited |
-
1982
- 1982-02-19 IT IT85519/82A patent/IT1193074B/en active
-
1983
- 1983-02-10 DE DE8383101279T patent/DE3361943D1/en not_active Expired
- 1983-02-10 EP EP83101279A patent/EP0087076B1/en not_active Expired
- 1983-02-10 AT AT83101279T patent/ATE17770T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
IT8285519A0 (en) | 1982-02-19 |
DE3361943D1 (en) | 1986-03-13 |
EP0087076A1 (en) | 1983-08-31 |
IT1193074B (en) | 1988-06-02 |
ATE17770T1 (en) | 1986-02-15 |
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