Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1996-02-01
1998-10-13
Nakarani, D. S.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428412, 428433, B32B 1710, G08B 1304
Patent
active
058209905
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a burglar-proof pane of glass.
2. Discussion of Background and Related Information
Intruders, such as thieves, are known to enter buildings through bay windows, for example, whose panes hardly resist shock. As a result, there have appeared on the market composite panes formed by alternate plates of glass and sheets of plastic materials of various origins (such as films of polyester or plates of polycarbonate).
Such panes are expensive and their positioning on existing window frames poses problems.
Added to the foregoing problem is the fact that if such panes make it possible to delay intrusion into a premises, they cannot oppose such intrusion when they are smashed, even if the smashing of such panes sets off an audible alarm, the deterrent effect of such alarm being entirely relative.
The problem involves utilizing means that act effectively during the breaking of the window panes. One solution is the formation of an electrified barrier, which is a very hypothetical solution, since window panes made of glass, for example, are not electrical conductors.
However, there are panes which comprise fine metallic particles on one of their surfaces. These panes are presently known to be used for reflecting infrared solar radiation.
In the present state of the art, such panes cannot be electrified because the problem of providing for electrical connection has not been resolved.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a solution to the problem of providing an electrical connection for the above-mentioned type of window pane.
More particularly, it is an object of the invention to apply, on the non-metallic surface of the pane, a metallic electrode to which a high voltage is applied by means of a transformer supplying a very low current at a high frequency.
Due to the low magnitude of the current, an intruder is not harmed if the pane of the invention is broken upon intrusion, while an electric arc is created and a violent shaking is nevertheless sensed, which can itself be used to deter the intruder and, further, to trigger an alarm.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to the invention, as mentioned above, on the non-metallic surface of a window pane, such as a surface of a glass pane, a metallic electrode is affixed, to which a high voltage is then applied by means of a transformer supplying a very low current at a high frequency.
The electrode, whose surface is very reduced with respect to the surface of the pane, is covered with an insulating material. The electrode can be hidden under the frame of the pane.
In normal operation, anyone can approach the window pane and touch it without harm. On the other hand, if during an attempted burglary, the pane is simply broken or split, an arc forms immediately and a violent shaking is felt by the intruder. This paralyzing shaking is without danger to the health of the burglar because the intensity of the current that circulates has been set in a manner so as to remain below the critical physiological threshold.
Satisfactory results have been obtained for voltages varying from 100 to 300,000 volts at frequencies varying from 100 Hz to 20 kHz.
Experience has shown that a galvanometer positioned at a certain distance from the pane registers a potential difference and that the value of the latter was modified if a person approached the pane and touched it. According to the invention, the signal thus produced can be utilized to control an alarm device, making it possible, for example, to make use of the deterrent phenomena.
Different solutions can be considered for utilizing the apparatus of the invention.
If a glass plate is utilized which is metallized at its surface, the metallized surface is covered with a glass plate or a plastic film.
The pane can be formed with the aid of two glass plates surrounding a metallized plastic film, the plastic film having the advantage of reinforcing the mechanical resistance of the pane
REFERENCES:
patent: 4641507 (1987-02-01), Demonbreun
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