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 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 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: A helical barbed tape includes barbs with enhanced rigidity, as well as an electrical sensor wire extending along the length of the helical barbed tape so as to be capable of use in an electronic intrusion detection system to mechanically detect disturbances induced on the barbed tape or its supporting structure.

Abstract: A helical barbed tape is provided with reinforced barbs. The tape includes a plurality of barb clusters at spaced locations along a central supporting portion. Each barb cluster includes a pair of oppositely directed barbs with the respective pairs being disposed on opposite sides of the central supporting portion. The reinforcement is defined by a portion of the respective barbs which extends out of the initial plane of the barbs. In one embodiment, the reinforcement defines an elongated reinforcing flange. In other embodiments, the reinforcement defines an embossment extending out of the plane of the barbs.

Abstract: A continuous strip of coiled material is provided with protrusions, such as barbs, which are oriented to eliminate mutual interference when the coiled material is stacked in a compact, collapsed nested condition and wherein each turn of the coil is permanently fixed at equiangularly spaced multiple points alternately to its adjacent trailing and leading turns of the coil. An intrusion detection system signals intrusion into the space encompassed by the above mentioned coil and features a microwave energy source, receiver and detector for indicating a reduction in received microwave energy at the receiver indicative of intrusion into or other disruption of the energy guided path determined by the coil.

Abstract: An entanglement barrier coil dispenser is disclosed wherein a frame supports a coil dispensing drum. The drum is designed to house a coil preliminary to its deployment, for example, as an anti-personnel barrier. The coil is extensible and retractable about its central axis between stretched and collapsed conditions and when housed within the drum is in collapsed condition coaxially aligned with a drum central axis. The frame in the specifically disclosed embodiment has a pair of skids for sliding surface movement upon vehicular towing, e.g., of the frame. The drum is supported for rotation on the frame whereby torsional stress within the coil during its deployment is automatically relieved to assure a desired obstacle emplacement without coil buckling.

Abstract: Coiled tape having successive linear segments each of equal length and uniformly angularly offset in the plane of the tape at identical bend angles relative to its trailing segment about a bend forming opening of predetermined size and shape.

Abstract: A machine having blanking, barb forming and bending stations is provided for making a coil of metal tape from a substantially planar linear strip of metal stock wherein such strip is fed in sequence to the stations in a single pass through the machine to respectively edge notch the strip into barbs, upset the barbs into inclined relation to the plane of the strip and then edge bend the strip in the plane of the strip to form it into identically angularly displaced adjoining linear segments of equal length to make a generally annular coil of barbed metal tape.The method of this invention features forming spaced openings along a longitudinal axis of a substantially planar linear strip of metal stock, positioning the strip by means of its openings and edge bending the strip in the plane of the strip adjacent its openings to form the strip into a coil having identical angularly displaced adjoining linear segments.

Abstract: A machine having blanking, barb forming and bending stations is provided for making a coil of metal tape from a substantially planar linear strip of metal stock wherein such strip is fed in sequence to the stations in a single pass through the machine to respectively edge notch the strip into barbs, upset the barbs into inclined relation to the plane of the strip and then edge bend the strip in the plane of the strip to form it into identically angularly displaced adjoining linear segments of equal length to make a generally annular coil of barbed metal tape.The method of this invention features forming spaced openings along a longitudinal axis of a substantially planar linear strip of metal stock, positioning the strip by means of its openings and edge bending the strip in the plane of the strip adjacent its openings to form the strip into a coil having identical angularly displaced adjoining linear segments.