GB2182690A

GB2182690A - Revolving spikes for tops of walls

Info

Publication number: GB2182690A
Application number: GB08527280A
Authority: GB
Inventors: Dennis Summers
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-11-06
Filing date: 1985-11-06
Publication date: 1987-05-20
Also published as: GB8527280D0; GB2182690B

Abstract

An anti-intruder barrier for mounting above or projecting from such as fences, walls, parapets to prevent intending intruders being able to climb up or over said fences, walls, parapets. The barrier comprises a plurality of units which each include at least one element 10 formed from a solid strip of metal bent acutely intermediate its ends and having its outer ends similarly fashioned to present at least two displayed spikes 11, with two side-by-side similar slots (12, Fig. 4) being cut-out longitudinally of the strip each to extend equally on both sides of said bend and with the land (14, Fig. 4) therebetween bent away from the lands (13, Fig. 4) to both outer sides of the slots with the apex of the intermediate land opposed to the apices of the outer lands to form therebetween a hole for reception of a shaft 15. <IMAGE>

Description

SPECIFICATION Anti-intruder barrier This invention relates to an anti-intruder barrier for mounting above or projecting from fences, wails, parapets or the like to prevent intending intruders being able to climb up or over said fences, walls, parapets or the like and thereby preventing unauthorised intrusion into the confines surrounded by said fences and/or walls and/or parapets or the like. Anti-intruder barriers have been proposed theretofore comprising a longitudinal axis formed by a shaft spaced from and parallel to the or the top of the fence, wall, parapet or the like by a series of brackets secured thereto, the shaft having spaced therealong a plurality of freely-rotatable units each comprising radiating elements. Adjacent units may be spaced apart by a spacing collar or the like.

Hereinafter in the specification such a barrier will be referred to as "an anti-intruder barrier of the type stated". GB 2 093 086B and GB 2013263B disclose the units being formed by bending two sheets of material each intermediate its ends with a portion of the material at the apex being cut away to interlock with the apex of another similar sheet to form a hole between said interlocked sheets for reception of said shaft, GB 2076038B discloses the units being formed by bending two bars of material each intermediate its ends and securing same around a collar through which the shaft passes. In all abovestated specifications, each unit has four elements equi-spaced apart. All above-described units are disadvantageous in that they do not provide for economy or ease in packaging for transport, and/or for storage for subsequent contractor or D.l.Y.

assembly.

An object of the present invention is to obviate or mitigate the aforesaid disadvantage.

Accordingly, the present invention comprises an anti-intruder barrier of the type stated wherein the units each include at least one element formed from a solid strip of metal bent acutely intermediate its ends and having its outer ends similarly fashioned to present at least two displayed spikes, with two side-by-side similar slots being cut-out longitudinally of the strip each to extend equally on both sides of said bend and with the land therebetween bent away from the lands to both outer sides of the slots with the apex of the intermediate land opposed to the apices of the outer lands to form therebetween a hole for reception of a shaft.

Preferably, a plurality of elements are nestable with each other and capable of being packed on side, for example in a carton for storage and/or transport.

Preferably also, the units may be mounted on the shaft in alternate fashion with the elements of one projecting to the opposite side of the elements of its immediate neighbour with means provided to link together two or more adjacent units in said alternate disposition; such means may, for example, be matable notches provided in contiguous lateral sides of adjacent elements.

Preferably further, a pair of elements can be interlocked together at their apices to form a hole for reception of a shaft, the intermediate land of one element thereby being aligned with the outer lands of the other.

An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 shows a perspective view of a detail of an anti-intruder barrier according to the present invention and illustrating one unit formed from a pair of interlocked elements: Fig. 2 shows a front view of Fig. 1; Fig. 3 shows a sectional view along the line Ill-Ill of Fig. 2; Fig. 4 shows a plan view of an element in its flat unbent position after having been pressed out from a blank; Figs. 5A and 5B show respectively in perspective view part of two elements at their respective bends in an about-to-be interlocked position, and in an interlocked position; Fig. 6 shows a detail of a bracket mounted on a wall; and Fig. 7 shows a perspective view of part of two elements at their respective bends and in an aboutto-be side-by-side linked position.

Referring to the drawings, an anti-intruder barrier of the type stated comprises a series of units each including two elements 10. Each element 10 is formed from a solid strip of metal bent acutely intermediate its ends and having its outer ends similarly fashioned as shown in Fig. 4 to present three spikes 11 displayed apart as shown in Fig. 1.

Two similar side-by-side slots 12 are cut-out longitudinally of the strip, each to extend equally on both sides of said bend, as shown in Figs. 1,2, 5A and 5B, leaving two outer lands 13 and one intermediate land 14. Land 14 is bent in the opposite direction to lands 13 as shown in Figs. 5A and 5B particularly. A hole is therefrom formed between lands 13 and 14 for reception of the shaft 15. The two elements 10 are interlocked as shown in Figs.

5A and 5B at their apices to form a hole for reception of a shaft 15 with the lands 14 of both elements being aligned with the lands 13 of their opposite partner and in a manner as shown in Fig. 5B.

Shaft 15 is tubular and is provided in convenient lengths between each bracket 16 which is wallmounted as shown in Fig. 6. Each bracket 16 has two apertures as shown in Figs. 1 and 2, and the shaft lengths are secured, by squeezing with pliers, the outer ends thereof as shown at 17 in Figs. 1 and 2.

Collars 18 are provided to interspace each pair of elements as shown in Figs. 1 and 2.

In a modification, pairs of elements may be used in each unit provided in alternate fashion with the elements of one projecting to the opposite side of the elements of its immediate neighbour. Means are provided to link together two adjacent units in said alternate disposition; such means may, for example, be matable notches 19 provided in contiguous lateral sides of adjacent elements.

More than two elements may be provided in each unit.

The elements of the above-described invention are of size and shape for pluralities of them to be nestable with each other and capable of being packed on side, for example, in a carton, for economy in packaging volume for transport and storage.

In a further alternative embodiment (not shown) the land 14 is maintained at the apex of the bend and the lands 13 are both bent inwardly to form therebetween a hole for reception of a shaft. With such an arrangement with elements 10 located side by side on a shaft the adjacent lands 13 of the two elements may be bolted to retain them in position.

Claims

1. An anti-intruder barrier of the type stated wherein the units each include at least one element formed from a solid strip of metal bent acutely intermediate its ends and having its outer ends similarly fashioned to present at least two displayed spikes, with two side-by-side similar slots being cutout longitudinally of the strip each to extend equally on both sides of said bend and with the land therebetween bent away from the lands to both outer sides of the slots with the apex of the intermediate land opposed to the apices of the outer lands to form therebetween a hole for reception of a shaft.

2. An anti-intruder barrier as claimed in claim 1 wherein a plurality of elements are nestable with each other and capable of being packed on side, for example in a carton for storage and/or transport.

3. An anti-intruder barrier as claimed in claim 1 or 2 wherein the units are mounted on the shaft in alternate fashion with the elements of one projecting to the opposite side of the elements of its immediate neighbour with means provided to link together two or more adjacent units in said alternate disposition.

4. An anti-intruder barrier as claimed in claim 3 wherein matable notches are provided incontiguous lateral sides of adjacent elements.

5. An anti-intruder barrier as claimed in claim 3 wherein a pair of elements can be interlocked together at their apices to form a hole for reception of a shaft, the intermediate land of one element thereby being aligned with the outer lands of the other.

6. An anti-intruder barrier as claimed in claim 3 wherein in each element the central land is maintained at the apex of the bend and the other lands are both bent inwardly to form therebetween a hole for reception of a shaft.

7. An anti-intruder barrier as claimed in claim 6 wherein adjacent outer lands of adjacent elements, in use, are arranged to overlap.

8. An anti-intruder barrier as claimed in claim 7 wherein such overlapping lands are bolted together, in use.

9. An anti-intruder barrier substantially as hereinbefore described with references to the accompanying drawings.