Abstract: A clip is disclosed for connecting two adjacent loops of segment bent helical barbed tape in close proximity to one another at a nesting point of two contiguous folds to form a concertina antipersonnel barrier. The clip includes first and second opposed flaps. The first flap includes an elongated semi-circular aperture extended therethrough and dimensioned to surround the contiguous folds in their entirety such that the clip reinforces the areas of stress concentration that lie proximate the contiguous folds. The second flap includes an identical elongated semi-circular aperture extended therethrough which functions to promote stacking of adjacent coils of helical barbed tape during storage. The clip further includes a unitarily formed locking mechanism defined by an extruded cylindrical sleeve disposed on the first opposed flap and a circular aperture extended through the second opposed flap.

Abstract: A hand tool is disclosed for rapidly recovering an extensible and retractable antipersonnel barrier of helical barbed tape. The hand tool includes first and second elongated parallel gripping arms joined at one end by a base section. Each of the elongated gripping arms includes an L-shaped rigid safety barrier defined by a forward guard rail and an elongated lateral guard rail. The distal end of each of the elongated lateral guard rails is disposed intermediate the base section such that the lateral guard rails are parallel to the elongated gripping arms. The distal end of each of the forward guard rails are disposed at the distal end of each of the elongated gripping arms respectively, thereby defining a pair of generally rectangular zones of safety. The hand tool further includes a telescoping engaging arm which comprises a fixed outer tube and a removable elongated inner tube. The inner tube is connected to the fixed outer tube by a bayonet-type locking mechanism.

Abstract: A new and improved apparatus and process for continuously forming an intrusion detection barrier coil from a strip of barbed metal tape is provided. The apparatus includes a series of rollers for deforming the central portion of the barbed metal tape into a generally U-shaped configuration, as well as a dispenser for depositing an elastomeric filler material into the U-shaped tape, and a mechanism for feeding a continuous length of vibration-sensitive electrical cable in the elongated, U-shaped tape. Thereafter, the composite assembly of U-shaped barbed tape, elastomeric and electrical cable is continuously forced through a set of opposed rollers so as to roll form the U-shaped section into a generally circular, closed configuration. The composite structure is then bent by a series of offset rollers in a generally horizontal plane to form a helical coil of intrusion detection barbed tape.

Abstract: An apparatus and process is provided for forming a helical barbed tape. The process first involves supplying rolled steel which is passed to an apparatus for blanking barbs and cutting the steel into strips. The strips are mounted on individual cassettes. The tape subsequently is fed from a cassette to a barb sensor and barb setter. The barb setter moves with the tape to effect the required offset in response to the sensed presence of a barb cluster. The tape then advances to a roll former which exerts a controlled differential pressure on opposed sides of the tape to create a uniform circular coil. The tape will have an unequal thickness across its width with the differential thickness being substantially uniform along the length of the tape.

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.

Abstract: An apparatus and process is provided for forming a helical barbed tape. The process first involves supplying rolled steel which is passed to an apparatus for blanking barbs and cutting the steel into strips. The strips are mounted on individual cassettes. The tape subsequently is fed from a cassette to a barb sensor and barb setter. The barb setter moves with the tape to effect the required offset in response to the sensed presence of a barb cluster. The tape then advances to a roll former which exerts a controlled differential pressure on opposed sides of the tape to create a uniform circular coil. The tape will have an unequal thickness across its width with the differential thickness being substantially uniform along the length of the tape.

Abstract: An apparatus and process is provided for forming a helical barbed tape. The process first involves supplying rolled steel which is passed to an apparatus for blanking barbs and cutting the steel into strips. The strips are mounted on individual cassettes. The tape subsequently is fed from a cassette to a barb sensor and barb setter. The barb setter moves with the tape to effect the required offset in response to the sensed presence of a barb cluster. The tape then advances to a roll former which exerts a controlled differential pressure on opposed sides of the tape to create a uniform circular coil. The tape will have an unequal thickness across its width with the differential thickness being substantially uniform along the length of the tape.

Abstract: An appartus and process is provided for forming a helical barbed tape. The process first involves supplying rolled steel which is passed to an apparatus for blanking barbs and cutting the steel into strips. The strips are mounted on individual cassettes. The tape subsequently is fed from a cassette to a barb sensor and barb setter. The barb setter moves with the tape to effect the required offset in response to the sensed presence of a barb cluster. The tape then advances to a roll former which exerts a controlled differential pressure on opposed sides of the tape to create a uniform circular coil. The tape will have an unequal thickness across its width with the differential thickness being substantially uniform along the length of the tape.