Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-04-13
1999-10-19
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
3403884, 3403911, 3405721, 3406935, G08B 1322
Patent
active
059696141
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an alarm tag comprising two parts one of which is provided with a pin attached to said one part to be located on one side of a product with the pin extending through the product into locking engagement with the other part located on the opposite side of the product, said one part having means for activating an alarm device in said one part.
BACKGROUND OF THE INVENTION
The alarm tag is of the type disclosed in PCT/SE95/00385 the content of which is incorporated herein by reference.
The purpose of the invention is to further improve the security against unauthorized removal of an alarm tag of the type referred to above from the product to be protected against theft by means of the alarm tag, and particularly to minimize the possibility of attenuating the sound emitted from the alarm tag when the alarm is trigged due to manipulation of the tag.
GB-A-2 272 987 describes a gas driven alarm carried at the top end of a closed tubular housing enclosing a liquid propellant container. The casing has an apertured frustoconical top portion the apertures in which are located laterally in the top portion and are protected by flanges and finer inner mesh each aperture being located between adjacent flanges. The alarm device is essentially a conical volume with a vibratory diaphragm at the narrow end and its larger mouth opening to the outside radially of the frustoconical top portion through the apertures therein.
SUMMARY OF THE INVENTION
The present invention is an alarm tag comprising two parts, one of which is provided with a pin attached to said one part to be located on one side of the product with the pin extending through the product into locking engagement with the other part located on the opposite side of the product, said one part having means for activating an alarm device in said one part, characterized in that the alarm device comprises a resonance chamber having a central outlet, and a cover mounted on said one part over said resonance chamber. The cover has a central portion in register with the outlet and bars extending radially from the central portion to the periphery of the cover. The bars define slots between adjacent bars. Other embodiments of the present invention are further described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to explain the invention in more detail reference is made to the accompanying drawings which disclose an illustrative embodiment and wherein
FIG. 1 is a side view of an alarm tag attached to a product which is shown fragmentarily in cross section,
FIG. 2 is an enlarged side view of that part of the alarm tag which comprises a pin and a head,
FIG. 3 is a plan view of the pin part of FIG. 2,
FIG. 4 is a cross sectional view of the pin part of FIGS. 2 and 3 taken along line IV--IV in FIG. 3,
FIG. 5 is a cross sectional view of a cover mounted on the pin part of FIGS. 2 and 3, taken along line V--V in FIG. 3, and
FIG. 6 is a cross sectional view taken along line VI--VI in FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1 there is disclosed an alarm tag which comprises a first part 10 containing means for initiating alarm from an alarm device which either is built into this part or consists of an external alarm device. The alarm is initiated when the alarm tag is carried out from a defined area in a department store or a shop due to the fact that the alarm tag then, at the exit from said area, will leave an electromagnetic or electrostatic field maintained in said area, or is carried through such a field maintained between bows located one at each side of the exit passage. This part of the alarm tag can be of any existing known construction. Part 10 is applied to one side of a product 11. The alarm tag also comprises a second part 12 consisting of a pin 13 with a head 14 said head being applied to the opposite side of product 11 with the pin extending through the product and being attached to part 10. The attachment is such that the parts cannot be moved apart for removal of the alarm tag from the pro
REFERENCES:
patent: 4328486 (1982-05-01), Burstein et al.
patent: 4812811 (1989-03-01), Asbrink et al.
patent: 5347262 (1994-09-01), Thurmond et al.
LaPointe Dennis G.
Mason, Jr. Joseph C.
MW International Ltd.
Swann Glen
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