Safes – bank protection – or a related device – Combined – With fluent material releasing – generating and/or...
Patent
1988-09-23
1990-07-24
Wolfe, Robert L.
Safes, bank protection, or a related device
Combined
With fluent material releasing, generating and/or...
109 41, 109 42, 109 35, 109 25, E05G 300
Patent
active
049428314
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for protected storage of objects.
A device of this kind is known from French Patent Application 2,445,429. In the known device the security shield consists of two electrically conducting layers which are separated from each other by an insulating layer and which are disposed against or preferably in the walls of the container. The processing circuit is arranged in such a way that if a short-circuit occurs between the electrically conducting layers which are separated from each other, the damaging means are activated.
In the known device it is possible to damage each of the layers without the damaging means being activated. By using a drill of electrically insulating material or by using a laser beam, it is, for example, possible to remove material from the electrically conducting layers without a short-circuit occurring between the layers. In this way a hole can be formed in a wall of the container and means can be conveyed into the container through the ho-e to prevent the damaging means from working properly, so that the objects can be removed from the container without damage to them. In order to limit the chance of short-circuiting, material can be removed from the outer electrically conducting layer first over a greater area than from the inner electrically conducting layer. This process can be used irrespective of the number of electrically conducting layers which are insulated from each other and for which the occurrence of short-circuiting between them is monitored.
The object of the invention is to eliminate the disadvantages of the known device.
This object is achieved according to the invention by means of the device described below.
If on damage to one or more of the electrical systems of the security shield the value of a parameter detected by the processing circuit deviates from a reference value, the damaging means will be activated.
The systems can extend over surfaces with various dimensions, the systems can overlap, and the processing circuit can detect various parameters of systems of differing design.
In a preferred embodiment a system is made up of a layer of electrically conducting material having two electrodes which are connected to the processing circuit and are arranged at a distance from each other, the parameter of the system corresponding to the resistance of the layer. The layer cf electrically conducting material can be formed by a quantity of material extending uniformly over the surface of the system, by a mesh structure, and preferably by a track pattern. If material is removed from the layer, the resistance thereof will change, and the damaging means will be activated. If an electrically conducting layer in the form of a track pattern is used, the processing circuit can detect not only whole, but also partial, piercing of the track, and in response to this can give the activation command to the damaging means. The resistance of a system formed by a layer--which may include a track pattern--of electrically conducting material can be determined by applying a voltage over the electrodes or passing a current through the layer and monitoring the voltage over the electrodes or the current through the layer and comparing it with a reference value. Where a track pattern is used it is possible to have an embodiment of the device in which only full piercing of the track is monitored, thus a change from a finite resistance value to an infinite resistance value. If a material with a high resistance temperature coefficient for the electrically conducting layer is used, temperature changes occurring through break-in attempts can be detected for producing in response thereto the activation command for the damaging means. For the detection of a local removal of material from an electrically conducting layer it is preferable for the cross-section resistance thereof to be relatively high. This can, for example, be achieved by making the layer, including a layer formed by a track pattern, of a fine-mesh structure, thus with small pores, it being possible fo
REFERENCES:
patent: 3559593 (1971-02-01), Munton
patent: 3851202 (1974-12-01), Lamping
patent: 4363279 (1982-12-01), Johanssa
patent: 4722435 (1988-02-01), Mareels
patent: 4729327 (1988-03-01), Demonbreun
patent: 4799435 (1989-01-01), Boutroy
Seculock B. V.
Wolfe Robert L.
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