Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-09-25
1989-03-14
Ruehl, Charles A.
Communications: electrical
Condition responsive indicating system
Specific condition
340568, 340572, G08B 1314
Patent
active
048128112
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an alarm tag of the kind, which in shop trading, for example in department stores and the like, is attached to clothes and other articles and intended to trigger an alarm when a person with an article, to which the alarm tag is attached, passes through an investigation zone. Several different designs of such an alarm tag are known.
Such alarm tags normally are arranged so as to be actuated by a magnetic field emitted in an investigation zone and thereby to re-emit a magnetic field with a characteristic, which triggers an alarm when the re-emitted magnetic field is received and detected.
As regards clothes and other textiles, such as fur goods and like articles, several known alarm tags are designed so as to be divisible into two pieces and comprise a needle intended to join the two pieces together. Prior to their joining together, the pieces are placed each on one side of a part of an article of clothing or corrsponding article, whereafter the needle is threaded through the article to join together the two pieces of the alarm tag.
Alarm tags of known type are also provided with a locking device, in order to prevent unauthorized dismantling of the alarm tag. According to one embodiment, the needle constitutes a part of the locking device.
The locking devices generally are of good workmanship, in the sense that a person not knowing the structural design of the alarm tag and not having access to a special means for dismantling the tag must apply considerable force to the tag for dismantling the same.
Known systems are based on the principle that it must be very difficult to dismantle the tag and remove it from the article of clothing or corresponding article without destroying the article.
At a cashier's desk shop employees remove the alarm tag with said special means in connection with the payment of the article.
It was found, however, that articles provided with alarm tags are stolen to an ever increasing degree. This is largely due to the fact, that persons to a greater extent than previously have the knowledge of how to dismantle a certain alarm tag and also have the equipment therefor. The person in question, thus, after having taken the article from its place, removes the alarm tag and leaves the shop through the investigation zone without taking along the alarm tag. Thereby no alarm is sounded.
The present invention provides an alarm tag, which is a very effective protection against theft, even when it is opened unpermittedly.
The present invention is based on the principle, that the alarm tag can be dismantled or divided, but when this takes place alarm is triggered, provided that the alarm tag is not de-activated. The alarm tag, further, triggers an alarm when it is present in an investigation zone of the aforesaid kind.
The present invention, thus, relates to an alarm device comprising a so-called alarm tag, which consists of two parts arranged so as to be placeable each on one side of an article, for example an article of clothing, of fur or another article, where a needle is provided to extend from one part through the article to the second part, which alarm tag comprises means for receiving a magnetic alternating field emitted to the alarm tag, and is characterized in that the alarm tag comprises means capable to emit an acoustic signal when the parts of the alarm tag move away from each other, when the alarm tag is in a first, active, state, and not to emit an acoustic signal when the parts of the alarm tag move away from each other, when the alarm tag is in a second, inactive, state.
The invention is described in greater detail below, with reference to embodiments of the invention shown in the accompanying drawings, in which
FIG. 1 shows schematically an alarm tag according to the invention seen from the side,
FIG. 2 schematically shows the alarm tag seen from below,
FIG. 3 shows a schematic block diagram of the electronics of the alarm tag,
FIG. 4 shows a receiving alarm device,
FIG. 5 shows a type of receiving alarm device other than that shown in FIG. 4,
FIG. 6 show
REFERENCES:
patent: 4380097 (1983-04-01), Keifer
patent: 4622543 (1986-11-01), Anderson, III et al.
patent: 4686513 (1987-08-01), Farrar et al.
Asbrink Leif
Graflind Ulf
Intermodulation and Safety System AB
Ruehl Charles A.
Tran Anh H.
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