Vibration responsive intrusion detection barrier
AssigneeMRM Security Systems, Inc.
InventorsAnthony J. Casella, John W. Mainiero, Michael R. Mainiero, Anthony R. Zagami
Life of this patent
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Abstract
An intrustion detection barrier is provided comprising inner and outer coils defined by helical barbed tape. The inner coil comprises a vibration-responsive intrusion detection cable securely retained and protected therein. The inner coil is supported centrally within the outer coil by radially extending supports which may be flat straps which are effective to transmit vibrations from the outer coil to the inner coil. The straps may be welded or otherwise mechanically connected to both the inner and outer coils, and may further be provided with clusters of barbs thereon.
Claims29
An intrusion detection barrier apparatus comprising:
- an outer coil having a plurality of barb clusters thereon;
- an inner coil of smaller radius than said outer coil and being disposed within said outer coil, said inner coil comprising a vibration-sensitive cable and a supporting tape formed around said cable, a plurality of barb clusters extending from said supporting tape at a plurality of spaced apart locations therealong;
- and
- a plurality of generally radially extending supporting means for supporting said inner coil generally centrally within said outer coil, whereby vibrations of said outer coil are transmitted through said supporting means and are sensed by the vibration-sensitive cable retained in said inner coil, and whereby the outer coil provides protection for said inner coil and the vibration-sensitive cable therein.
An intrusion detection barrier comprising:
- an outer coil defined by a helical barbed tape having a helically formed central supporting portion and a plurality of clusters of barbs at spaced apart locations therealong, said helical barbed tape defining a plurality of continuous coils, with adjacent coils being retained in proximity to one another at a plurality of locations thereabout;
- metallic straps securely connected to said outer coil and extending radially inwardly therefrom at a plurality of spaced apart locations along said outer coil;
- an inner coil disposed generally centrally within the helix defined by said outer coil and supported therein by said straps, said inner coil comprising a vibration-sensitive cable and a helical barbed tape, said helical barbed tape comprising a central supporting portion generally wrapped around said cable and a plurality of barbs extending from said central supporting portion, whereby vibrations in said outer coil are transmitted through said straps and sensed by the vibration-sensitive cable formed within said inner coil, and whereby the barb clusters on said outer coil provide protection for the inner coil and the cable therein.
An intrusion detection barrier comprising:
- a helical barbed tape having an elongated helically formed central supporting portion and a plurality of barb clusters extending from said central supporting portion, said central supporting portion being formed to define a generally annular cross section at points along the length of said central supporting portion;
- a vibration-sensitive cable disposed in the annularly formed central supporting portion of the helical barbed tape;
- and
- a filler material intermediate the vibration-sensitive cable and the barbed tape, whereby the filler material prevents accumulation of moisture between the cable and the barbed tape and enhances the transmission of vibrations from the barbed tape to the cable.
A method for forming an intrusion detection barrier, said method comprising the steps of:
- providing a barbed tape having an elongated central supporting portion and a plurality of barb clusters extending unitarily therefrom;
- forming a longitudinally extending channel in said central supporting portion;
- feeding a controlled amount of an initially flowable filler material into the channel;
- placing an elongated vibration-sensitive cable in the channel;
- and
- forming the central supporting portion of the barbed tape around the vibration-sensitive cable and the filler material, whereby the filler material prevents accumulation of moisture between the cable and the barbed tape and enhances the transmission of vibrations to the cable.
Dependencies are inferred from the claim text.