Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-03-04
1986-03-25
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1308
Patent
active
045786704
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an alarm system for the safeguarding against the breakthrough of a surface, for example a wall, the wall of a suitcase or a pane of glass, said system being of the kind where a pattern or network of electrical conducting wires or leads are distributed uniformly over the surface.
2. Description of the Related Art
With such known systems, where the leads lie in one layer, it is possible in principle for a criminal to remove a section of a lead after having short-circuited its ends with the help of a longer length of lead. In this manner it is possible with repeated operations in a chosen area to create an opening which is sufficiently large to enable stolen goods to be passed through.
The object of the present invention is to provide a construction without this drawback and, moreover, having several advantages.
SUMMARY OF THE INVENTION
The alarm system according to the invention is characterized in that the wires are arranged to lie in at least two surfaces, preferably plane surfaces lying at a small distance from each other seen at right angles to the surfaces, that the wires are comprised of a series consisting of the number n of wires, that this series runs uninterrupted through the surfaces so that the assembled network has the number n of input terminals and the number n of output terminals, that these terminals are connected to a current supply, a microprocessor or other electronics and an alarm in such a way that to a number of the wires n there are applied other voltages or signals in relation to the remainder, and that the microprocessor or the electronics unit is arranged to activate the alarm in the event that the voltage or the signals on just one of the output terminals does not correspond to the voltage or the signals on the corresponding input terminal.
By dimensioning such a system in a suitable manner, i.e. with conveniently close-lying wires seen both in the directions of the above-mentioned planes and at right angles thereto, it can be made very difficult to remove a section of a given wire without at the same time damaging the wires in another layer and thereby activating the alarm. It will be obvious that the breadth and the pattern or patterns of the wires can be varied quite considerably without deviating from the scope of the invention.
According to the invention, the individual surfaces can be connected in series, i.e. the series of wires runs first over the whole of the first surface, and from there further over the whole of the second and so on, hereby providing a very simple construction.
Moreover, according to the invention the series in the first surface can be laid out in a pattern in such a manner that the wires are parallel with each other over the greater part of the surface area, and that the same is the case for the following surface or surfaces, but that the wires from surface to surface form angles to each other, hereby further rendering a breakthrough difficult.
One embodiment of the system can be characterized by the wires being moulded into or enclosed in one or more insulating materials, for example by being laid out and secured on both sides of an insulating support layer and thereafter covered with an insulating covering material. There is hereby provided a finished product which can be dispatched without being damaged, and which thereafter can be mounted at the place of application.
A second embodiment can be characterized by an insulated support layer, composed of a so-called printboard, which is provided on both sides with a printed circuit and comprises two electrically connected wire surfaces, preferably connected in series. There is thus provided a construction which is not only simple to produce, but which also has the characteristics mentioned in connection with the foregoing embodiment. One can thus envision the insulating support layer as being wall decorating material, so that one can cover a whole wall with the support layer and then connect the individual sections of th
REFERENCES:
patent: 3594770 (1971-07-01), Ham et al.
patent: 3725891 (1973-04-01), Miller
patent: 3763795 (1973-10-01), Wetz, Jr.
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