DE102014001524A1 - Theft prevention device for media-receiving container, has detection device that is configured to detect current flowing between electrically conductive layers, such that alarm signal is outputted in response to detected current flow - Google Patents

Abstract

The device has a layer composite (1) that comprises an insulation layer (4) which is arranged between the electrically conductive layers (2,3). The electrically conductive layers are electrically separated from one another by the insulation layer. A detection device (5) is electrically connected to the conductive layers. The detection device is configured to detect a current flowing between the electrically conductive layers, such that an alarm signal is outputted in response to a detected current flow.

Description

The invention relates to a device for the protection against theft of a medium from a container.

Alarm systems are known from the prior art, which respond to unauthorized intrusion into closed spaces, including in the form of containers. The known principles of action are based inter alia on contacts at the room entrances, motion sensors, pressure sensors or level sensors.

An operating method for a semiconductor device that is suitable for protection against electrostatic discharge (ESD) is described in the document DE 101 34 665 C1 described. The semiconductor device has on a substrate a conductive polysilicon strip having first and second electrical contacts, the polysilicon strip forming an electrical resistance between the contacts that is reversibly operated in a current / voltage range. At low current, the resistor assumes a certain nominal value, and when a threshold current or threshold voltage is exceeded, the device jumps to a better conductive state with a lower differential resistance, so that the ESD protection is ensured by dissipation of the overvoltage.

The publication DE 39 19 099 A1 discloses a multilayer switch based on foil switches. In the multi-layer membrane switch several surface switches are integrated one above the other. By different actuation forces of the switch, several separate signals can be triggered. However, the switch only responds to pressure so that it would only be suitable for monitoring the opening of room entrances.

From the publication DE 697 36 703 T2 For example, a multilayered conductive composition system is known in which pairs of spaced-apart parts are disposed on an insulating substrate as a lower conductive layer which are covered by an immediately adjacent upper composition layer. The conductivity of the upper layer is lower than that of the lower layer, so that no current flow takes place. The upper layer may operate as a low current touch sensitive switching element which, when contacted at a predetermined horizontal location on the surface, closes a circuit across the portions of the conductive layer. The system described is thus not suitable for controlling an electrical system when vertically penetrating the superimposed layers, as with the perforation of walls.

The object of the invention is to develop an anti-theft device for a media-receiving container, which triggers an alarm during the attempt to perforate the container wall and to prevent or at least to steal a medium from walls completely enclosed by walls, which takes place through the perforation of a wall difficult.

The problem is solved by the features listed in the protection claim 1. Preferred developments emerge from the subclaims.

An anti-theft device according to the invention for a media-receiving container has a layer composite comprising a first electrically conductive layer facing the attack direction, a second electrically conductive layer facing away from the attack direction, and an insulation layer disposed between the first and second electrically conductive layers the insulation layer electrically separates the electrically conductive layers from each other. It also has a detection device which is connected to the first and the second electrically conductive layer. By means of the detection device, a current flow between the electrically conductive layers can be detected and an alarm signal can be output as a function of a detected current flow.

In particular, the alarm signal can be output optically, acoustically, as a switching state for any further devices, can be transmitted by remote transmission, etc.

The layer composite is directly associated with the walls of a media-receiving container. In an attempt to perforate the wall of the container with the layer assembly disposed thereon by means of an electrically conductive tool, the tool, in particular a drill, establishes an electrically conductive connection between the first and second conductive layer which is detected by the detection device Alarm signal is output.

The layer composite is preferably arranged directly in front of or on the outer sides of the outer walls. The alarm signal is thus generated in this training before the perforation of the actual container wall.

The concept of the anti-theft device according to the invention is that an attack is detected and that an attacker should be prevented from theft by the alarm signal. The detection can initiate measures to track and capture an attacker. If the attacker is held by the alarm signal, the destruction of the Container, its repair or replacement with corresponding consequential costs, as well as the possibly environmentally harmful leakage of media from the container. Even if a perforation of the container should not have been avoided, the alarm can promptly initiate measures to curb the consequences of escaping polluting media.

A particular advantage of the solution according to the invention consists in the simplicity, robustness and high reliability. Another advantage is the good adaptability to different container shapes and sizes as well as the possibility of the anti-theft device on potentially vulnerable portions of the container. Another advantage is the ease of manufacture and assembly.

In an advantageous embodiment, at least one of the electrically conductive layers is formed by the wall of the container.

In this case, the wall of a container serves, for example, as a second electrically conductive layer, on which the insulating layer and an overlying conductive layer are applied as the first electrically conductive layer. However, it is also possible that the wall forms the first electrically conductive layer, and that on the inside of the insulating layer and the second, so the attack side facing away from electrically conductive layer are applied. While in the first variant, the advantage in an alarm triggering before perforation of the container wall, the second variant offers the advantage of a hidden design that can not be recognized or disabled only difficult or. In both variants, there is the advantage that the production cost for one of the two conductive layers is eliminated.

Furthermore, in an advantageous development, the insulation layer may be formed by the wall of the container. This has the production technology advantage that the two electrically conductive layers must be applied only on both sides of the wall.

The wall of the container can in this case also be embodied in a particularly advantageous variant as a composite material which has both electrically conductive layers and the insulating layer at the same time. The composite material can be equipped with recessed or on the surfaces seconded electrically conductive layers.

Furthermore, in an advantageous embodiment, at least one of the layers may consist of a pasty substance.

When the insulating layer is made of a pasty substance, in an advantageous further development, it can be displaced in sections by applying pressure, and a current flow between the electrically conductive layers can thus be produced by touching the electrically conductive layers.

The output of the alarm is thereby advantageously already in blunt mechanical attack on the container wall.

In a development, the layer composite is designed in the form of a rigid surface element.

The surface element can thus serve as a cheap cover of the container and access obstacle to the wall, without necessarily being in direct communication with the container wall. Revisions of the container wall or an exchange of the container or the layer composite are each independently possible.

In another development of the layer composite is formed in the form of a flexible surface element, whereby its mounting is favored on containers with a curved surface.

In another advantageous development, the layer composite can be applied to the wall of the container by a coating method.

In this way, the application of the layer composite is technologically easy to implement, which can be largely equip any geometric shapes of the container so.

In a further advantageous variant, the layer composite is assigned a penetration protection layer.

This penetration-resistant layer in the form of a layer with high strength as additional mechanical protection against perforation can be designed both in addition to the layer composite or as one of the layers.

Since the alarm is already triggered by the detection device by the perforation of the layer composite, the further perforation is prevented by the container wall by deterring the attacker. If the penetration protection layer is designed as a first conductive layer, the attacker is also quenched and prevented from the complete perforation of the container wall.

Alternatively or cumulatively, a penetration protection layer may also be on the attack side be arranged. This has the advantage that the electrically conductive layers are protected against manipulation.

In a further variant, the layer composite is arranged on the side of the wall of the container which faces away from the direction of attack.

With this hidden arrangement of the layer group for theft protection, an attacker can not recognize this. The theft device is thereby better protected against attempts to deactivate. Preferably and expediently, the layer composite is glued directly to the inside, so that the container contents are not accessible without triggering an alarm.

The electrically conductive layers are in a further advantageous development depending on the detected by the detection device current flow through this voltage switchable.

With the voltage release of the conductive layers after the alarm triggering by the detection device, sparking is prevented. Should the container wall be perforated despite the triggering of the alarm, this avoids the ignition of flammable liquids or the explosion of explosive / flammable gases.

The detection device has a holding circuit in a further variant.

With a conventional, simple holding circuit, the alarm signal output is maintained with a particularly simple and störunempfindlichen means, even after the flow of current between the two electrically conductive layers after removal of the mold-producing tool no longer exists.

The invention will be described as an embodiment with reference to

1 schematic representation of the anti-theft device with a section of a section of a layer composite in the region of a container wall and a detection device and

2 schematic representation of the anti-theft device according to 1 with perforated layer composite by means of an attack tool
explained in more detail.

To 1 For example, an anti-theft device according to the invention for a media-receiving container has a layer composite 1 on, which is a first electrically conductive layer 2 , a second electrically conductive layer 3 and one between the first and second electrically conductive layers 2 ; 3 arranged insulation layer 4 includes, wherein the insulation layer 4 the electrically conductive layers 2 ; 3 electrically separated from each other, and a detection device 5 by means of a first connection 6 with the first and a second connection 7 with the second electrically conductive layer 2 ; 3 is connected and with the detection device 5 a current flow between the electrically conductive layers 2 ; 3 can be detected and detected current flow an alarm signal from the detection device 5 is issued.

The layer composite 1 is in front of a wall 8th a media-receiving container, for example the fuel tank of a vehicle, wherein over the second electrically conductive layer 3 a non-electrically conductive cover layer 9 for protecting the second electrically conductive layer 3 is applied.

The detection device 5 has a contact circuit 10 and a holding circuit coupled thereto 11 on, wherein the layer composite 1 about the connections 6 ; 7 and the contact circuit 10 with a voltage source 12 connected is.

The contact circuit 10 serves to detect a current flow between the first electrically conductive layer 2 and the second electrically conductive layer 3 , In the presence of a current flow between the electrically conductive layers 2 ; 3 interrupts the contact circuit 10 the connection to the electrically conductive layers 2 ; 3 , At the same time, the contact with the circuit 10 coupled holding circuit 11 activated.

The holding circuit 11 triggers an actor 13 an alarm system 14 out. A self-sufficient power supply 15 the holding circuit 11 ensures their function, so no dependence on the voltage source 12 is present.

When trying the wall 8th the container with the layer composite arranged thereon 1 by means of an electrically conductive attack tool 16 to 2 to perforate, provides the attack tool 16 an electrically conductive connection between the first and second conductive layer 2 ; 3 coming from the detection device 5 detected and by means of the coupled holding circuit 11 about the actor 13 the alarm system 14 triggers and an alarm signal is issued. The holding circuit 11 has an optical display, not shown, which is still active at the end of the alarm and can only be reset manually, so that perforation attempts can still be detected at later times.

The alarm signal is already before perforating the wall 8th generated by the container, allowing an attacker by the alarm signal quenched, prevented from theft and from the container no medium 17 exit.

The anti-theft device can be used to protect any wall of an enclosed space. A typical application is the protection of containers, in particular fuel tanks of motor vehicles, to prevent theft of fuel by tapping the tank.

LIST OF REFERENCE NUMBERS

1

laminate

2

first electrically conductive layer

3

second electrically conductive layer

4

insulation layer

5

detection device

6

first connection

7

second connection

8th

wall

9

topcoat

10

Contact circuit

11

hold circuit

12

voltage source

13

actuator

14

alarm system

15

self-sufficient power supply

16

attack tool

17

medium

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10134665 C1 [0003]
• DE 3919099 A1 [0004]
• DE 69736703 T2 [0005]

Claims (12)

Anti-theft device for a media-receiving container, comprising a layer composite ( 1 ), which comprises a first electrically conductive layer ( 2 ), which faces the direction of attack, a second electrically conductive layer ( 3 ) facing away from the direction of attack and one between the first and second electrically conductive layers (FIG. 2 ; 3 ) arranged insulation layer ( 4 ), wherein the insulating layer ( 4 ) the electrically conductive layers ( 2 ; 3 ) electrically separated from each other, and having a detection device ( 5 ), which are connected to the first and the second electrically conductive layer ( 2 ; 3 ) and with which a current flow between the electrically conductive layers ( 2 ; 3 ) can be detected and in dependence of a detected current flow, an alarm signal can be output. Anti-theft device for a media-receiving container according to claim 1, characterized in that at least one of the electrically conductive layers ( 2 ; 3 ) through a wall ( 8th ) of the container is formed. Anti-theft device for a media-receiving container according to claim 1 or 2, characterized in that the insulating layer ( 4 ) through the wall ( 8th ) of the container is formed. Anti-theft device for a media-receiving container according to one of the preceding claims, characterized in that at least one of the layers ( 2 ; 3 ; 4 ) consists of a pasty substance. Anti-theft device for a media-receiving container according to claim 4, characterized in that the pasty substance is partially displaceable by pressure, whereby the electrically conductive layers ( 2 ; 3 ) and thus a current flow between the electrically conductive layers ( 2 ; 3 ) is detectable. Anti-theft device for a media-receiving container according to one of the preceding claims, characterized in that the layer composite ( 1 ) is formed in the form of a rigid surface element. Anti-theft device for a media-receiving container according to one of claims 1 to 5, characterized in that the layer composite ( 1 ) is formed in the form of a flexible surface element. Anti-theft device for a media-receiving container according to one of claims 1 to 5, characterized in that at least one of the layers ( 2 ; 3 ; 4 ) of the layer composite ( 1 ) by a coating method on the wall ( 8th ) of the container can be applied. Anti-theft device for a media-receiving container according to one of the preceding claims, characterized in that the layer composite ( 1 ) is assigned a penetration protection layer. Anti-theft device for a media-receiving container according to one of claims 1 and 4 to 9, characterized in that the layer composite ( 1 ) is arranged on the side facing away from the attack direction of the container. Anti-theft device for a media-receiving container according to one of the preceding claims, characterized in that the electrically conductive layers ( 2 ; 3 ) as a function of the detection device ( 5 ) detected current flow through the detection device ( 5 ) are voltage-free switchable. Anti-theft device for a media-receiving container according to one of the preceding claims, characterized in that the detection device ( 5 ) a holding circuit ( 11 ) having.

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