SE538035C2 - Anti-intrusion arrangements - Google Patents

Abstract

Our ref: 6820516 ABSTRACT The present invention deals with an intrusion preventing arrangement (15),comprising a cut prevention layer (10) of a hard material that is impossible or atleast difficult to cut through with a cutting device, and a power tool prevention layer(20) of a textile fabric, wherein the power tool prevention layer comprises an activelayer of threads that, upon contact with hooks of a power tool, e.g. saw teeth of apower-driven saw, are arranged to be engaged by the hooks. The arrangement(15) further comprises an adhesive layer (25) that comprises a material suitable foradhering to a rotating arrangement of a power-driven tool and for adhering to thethreads of the active layer of the power tool prevention layer. The material may bebitumen. Thereby, intrusion from knives, chain saws as well as circular saws with plain saw blades without saw teeth may be prevented. (Fig. 1)

Description

INTRUSION PREVENTING ARRANGEMENT Technical field

[0001] The present invention relates generally to an intrusion preventingarrangement. More specifically, the present invention relates to an intrusionpreventing arrangement for preventing intrusion from hand-held cutting devicesand from power-driven tools. The present invention further relates to a panel for a vehicle, such as a truck, comprising such an intrusion preventing arrangement.

Background art

[0002] For protecting articles that are liable to be stolen, which are stored in acertain space, such as in a truck, building, shop, boat, trailer, mobile home,camping trailer or container, the space can be equipped with, or surrounded with,an intrusion preventing arrangement which is a cut prevention layer. The cut-prevention layer can be arranged in a truck panel, a hard cover, a door etc. Thecut-prevention layer is of a hard material that makes it impossible or at leastdifficult to cut through with a cutting device such as a knife. Examples of such hardmaterials are a steel door layer, or a layer of any hard material such as hardplastic, composite, wood, or any metal layer such as aluminum etc.

[0003] Recently, intruders have started using power-driven saws, such as chainsaws and circular saws, equipped with a saw blade of such a hard material thatthe power-driven saw, thanks to the hardness of the blade and the power strengthof the power driven saw, can saw it's way through the cut-prevention layer.Thereby, the intruders can easily get access to the articles liable to be stolen.Also, other power-driven tools that may force their way through a cut-prevention layer has been used, such as power-driven drills etc.

[0004] Consequently, there is a need for an intrusion preventing arrangementthat can protect a space from intrusion attacks from both hand-driven cuttingdevices, such as knives, and power-driven tools, such as power-driven chain saws, circular saws and power-driven drills.

Our ref: 68205 Summary of invention

[0005] lt is an object of the invention to address at least some of the problemsand issues outlined above. lt is possible to achieve these objects and others byusing a method and an apparatus as defined in the attached independent claims.

[0006] According to one aspect of the invention, an intrusion preventingarrangement is provided comprising a cut prevention layer for preventing intrusionwith a hand-driven cutting device, the cut prevention layer being of a hard materialthat is impossible or at least difficult to cut through with a hand-driven cuttingdevice, a power tool prevention layer of a textile fabric for preventing intrusion witha power-driven tool, wherein the power tool prevention layer comprises an activelayer of threads that, upon contact with a rotating arrangement of a power-driventool, are arranged to be engaged by the rotating arrangement, and an adhesivelayer comprising a material suitable for adhering to a rotating arrangement of apower-driven tool and for adhering to the threads of the active layer of the power tool prevention layer.

[0007] The hard material of the cut prevention layer may be a hard plastic, hardcomposite material, wood or any metal or any combination of the above. Thehand-driven cutting device may be any device used for cutting, such as a knife, ahand-driven saw, a pair of scissors etc. A power-driven tool may be for example achain-saw, i.e. a saw with a rotating blade having saw teeth, the saw teeth drivinga saw-chain, a circular saw with a rotating blade having teeth or not having teethor a power-driven drill. Other examples of tools with rotating blades without sawteeth are angle grinders, side grinders, concrete cutters etc. The cut-preventionlayer and the saw prevention layer are separate layers.

[0008] Such an arrangement can withstand intrusion from both power-driventools having hooking arrangements on which the threads of the active layer maybe hooked, such as saw teeth of a chain of a chain saw, and also from otherpower-driven tools without teeth or any other kinds of hooking arrangements, suchas a circular saw with circular, plane saw blades. When a power-driven tool breaks the cut-prevention layer the blade of the tool will be smeared down by the material Our ref: 68205 of the adhesive layer and the threads of the active layer will be caught by theadhesive material and thereby also caught by the rotating arrangement of thepower-driven tool. The threads will thereby also clog in a hub of the rotatingarrangement of such a power-driven tool with plane blades. Consequently, suchan arrangement prevents intrusion from a hand-driven cutting device, via the cut-prevention layer, from a power-driven tool with teeth such as a chain saw, via thecut-prevention layer and the power tool prevention layer and it also preventsintrusion from circular saws with plane saw blades, via the combination of thethree layers.

[0009] According to an embodiment, the adhesive layer is separated from thepower tool prevention layer. The adhesive layer may be separated from the power-tool prevention layer such that the adhesive layer does not adhere to the power-tool prevention layer when the intrusion preventing arrangement is in a normal,non-intruded condition, i.e. when the intrusion-prevention arrangement has not been attacked by an intruder.

[0010] According to another embodiment, the adhesive layer is separated fromthe power-tool prevention layer by a separating layer of e.g. a plastic film. By sucha separating layer, it is avoided that the adhesive layer is smeared onto thethreads of the power tool prevention layer before the intrusion preventingarrangement is attacked and the threads of the active layer of the power toolprevention layer has been torn out by the power-driven tool. lf the material of theadhesive layer would be smeared out onto the threads of the power toolprevention layer before an attack there is a risk that the threads would be heldback to the power tool prevention layer by the adhesive and that they will breakwhen attacked by a power-driven tool due to the higher strength needed for pullingthem out of the layer when the layer is smeared down with the adhesive material.

[0011] According to another embodiment, the adhesive layer, the power toolprevention layer and the cut-prevention layer are arranged in the following order,in a direction from a possible intruder towards a space to be protected from anintruder: the cut-prevention layer, the adhesive layer, the power-tool prevention Our ref: 68205 layer of textile fabric. Such an order is considered to be the most beneficial order,in a best possible way protecting against intrusion.

[0012] According to another embodiment, the material of the adhesive layer ispitch, preferably bitumen. Bitumen is a sticky, black and highly viscous liquid orsemi-solid form of petroleum. lt may be found in natural deposits or may be arefined product. lt is a substance classed as a pitch. An alternative of usingbitumen as the material of the adhesive layer is to use other types of sticky pitchessuch as resin or tar. Bitumen has a very good adhesive characteristic for adheringto metallic material such as used in power driven tools. Other alternatives ofadhesive-layer material are beeswax or other natural, organic products, mixturesof organic and synthetic products, or pure synthetic products. The adhesive layermay be put in an enclosure, so that the material is held within the enclosure until apower-driven tool forces the enclosure which results in that the adhesive materialis released and smeared onto the tool.

[0013] According to another embodiment, the adhesive layer further comprisesa tool-wearing material arranged for wearing out a rotating arrangement of apower-driven tool, the tool wearing material being for example bits of stone,ceramic, mineral, glass and/or metal. By mixing the adhesive material with a tool-wearing material such as bits of stone etc., tests have shown that a metallic bladeof a power-driven saw will be worn down surprisingly quick if trying to work its waythrough such an intrusion preventing arrangement where the adhesive layerexcept for the adhesive material also comprises tool-wearing material such as bitsof stone.

[0014] According to another embodiment, the power-tool prevention layer furthercomprises a passive layer of threads, wherein the threads of the passive layerinterconnects the threads of the active layer. The passive layer of threads keep theactive layer of threads in place in a normal condition, .i.e. a condition when the intrusion preventing arrangement has not been attacked.

[0015] According to another embodiment, the threads of the passive layerinterconnect the threads of the active layer in such a way that the threads of the Our ref: 68205 active layer are forced to extend in a serpentine or tortuous pattern. Thereby, thethreads of the active layer are easily caught by the rotating arrangement of a power-d riven tool.

[0016] According to another embodiment, the threads of the active layer havesuch a strength in relation to a strength of the threads of the passive layer thatthey cause the threads of the passive layer to break in case the threads of theactive layer are caught by a rotating arrangement of a power-driven tool. ln otherwords, the active layer threads are stronger than the passive layer threads.

[0017] According to another embodiment, the intrusion preventing arrangementfurther comprises an envelope. Further, the power tool prevention layer and theadhesive layer are positioned inside the envelope but not the cut prevention layer.Such an arrangement may be especially advantageous when arranged in an outerdoor for example. The envelope may be delivered to a security door manufacturer,which installs the envelope inside the door on the inside of a steel layer of the security door. The steel door layer would then function as a cut-prevention layer.

[0018] According to a second aspect, a panel for a vehicle, such as a truck, isprovided, the panel comprising an intrusion preventing arrangement according tothe first aspect.

[0019] Further possible features and benefits of this solution will becomeapparent from the detailed description below.

Brief description of drawinqs

[0020] The invention is now described, by way of example, with reference to theaccompanying drawings, in which:

[0021] Fig. 1 is a side view of a schematic block diagram of an intrusion preventing arrangement according to an embodiment.

[0022] Figure 2 is a side view of another schematic block diagram of an intrusion preventing arrangement according to an embodiment.

Our ref: 68205

[0023] Figure 3 is a side view of a power tool -prevention layer and an adhesive layer arranged in an envelope.

[0024] Figures 4-8 are front views of examples of power tool prevention layersof textile fabric that may be used in an intrusion preventing arrangement according to the invention.

Description of embodiments

[0025] The present invention is based on an idea of using a fabric for work-clothes, which in the work-clothes serves as a protection against injuries that may be caused by a power-driven chain saw, for intrusion prevention purposes instead.

[0026] The invention is realized by an intrusion preventing arrangementcomprising a cut-prevention layer of a hard material that is impossible or at leastdifficult to cut through with e.g. a knife, an adhesive layer of a material that adheres to (or sticks to) a rotating arrangement of a power-driven tool when coming into contact with the tool, and a power tool prevention layer of textile fabric.

The power tool prevention layer comprises an active layer of threads that, uponcontact with saw teeth of a power-driven saw, or any rotating arrangement of apower-driven tool are arranged to be engaged by the rotating arrangement. Thecut-prevention layer may for example be a metal layer like a steel door layer. Thepower tool prevention layer may be a weft-knitted textile fabric with active layer ofthreads loosely knitted into a passive layer of threads. The adhesive layer may bea layer of bitumen. Thanks to the cut-prevention layer, intrusion with a cuttingdevice such as a knife, a hand-driven saw etc is prevented. Thanks to the powertool prevention layer, intrusion with a power-driven tool with rotating blade isprevented. The active layer threads are hooked by hooking arrangements of thetool blade such as saw teeth and torn out so that they eventually clog in the hub ofthe tool making the tool stop. Thanks to the adhesive layer, a power driven toolhaving a rotating arrangement without hooks such as saw teeth will be at leastpartly covered with the adhesive layer when the rotating arrangement comes intocontact with the adhesive layer and the threads of the active layer will then stick to the rotating arrangement via the adhesive material. The threads will then be torn Our ref: 68205 out by the tool and cling onto the tool and get stuck in the hub of the rotatingarrangement and subsequently stop the tool, in the same way as described for the active layer above when the tool has hooks.

[0027] lntrusion preventing arrangements for e.g. truck panels have historicallyhad a cut-prevention layer of a hard material, e.g. an aluminum sheet. Accordingto the invention, such a cut-prevention layer is combined with a power toolprevention layer and an adhesive layer according to above. Tests of such anintrusion preventing arrangement have shown that when a power-driven chain sawworks through the cut-prevention layer, the threads of the active layer of the powertool prevention layer are caught by the saw teeth and torn out. Thereby, thethreads of the active layer clog the saw blade and arrest the power-driven saw.Consequently, the intruder cannot work himself through the intrusion preventingarrangement. On the other hand, if the intruder uses a cutting tool, the cut-prevention layer would stop him from working through the intrusion preventingarrangement. ln addition, when a power-driven saw without saw teeth is used,such as a circular saw with a plain saw blade, the threads of the active layer hasno saw teeth to be caught by. To stop also such a power-driven saw without sawteeth, a third layer, which is the adhesive layer is inserted. The adhesive layercomprises a material that is sticky, in other words adhesive, for both rotating toolparts and for active layer threads. As stated above, when the plain saw bladecomes into contact with the adhesive layer it will be smeared by the adhesivematerial, when coming into contact with the active layer threads the threads will beadhered to the adhesive material on the saw blade and torn out, clog the sawblade and arrest the saw.

[0028] Figure 1 shows an intrusion preventing arrangement 15 according to anembodiment of the invention. The intrusion preventing arrangement 15 comprisesa cut-prevention layer 10 of a hard material and a power tool prevention layer 20of textile fabric, the power tool prevention layer comprising an active layer ofthreads that, upon contact with hooks of a power driven tool, such as saw teeth ofa power-driven saw or a drill spiral of a drill, are arranged to be engaged by thehooks. The intrusion preventing arrangement 15 further comprises an adhesive Our ref: 68205 layer 25 of an adhesive material that sticks to a rotating arrangement of a power-driven tool when coming into contact with the tool. The different shapes of thelayers in the figures do not resemble the actual shapes of the layers. lnstead, theyare only used to better distinguish the layers from each other.

[0029] The cut-prevention layer 10 is preferably arranged closer to the outside,i.e. closer to the possible intruder 30 than the adhesive layer 25 and the power toolprevention layer 20. The power tool prevention layer 20 is preferably arrangedcloser to the goods 40 to be protected, i.e. closer to the goods 40 than the cut-prevention layer 10 and the adhesive layer 25. ln this embodiment, the intruder 30first has to force the cut-prevention layer 10 before reaching the adhesive layer 25and after penetrating the adhesive layer 25 he reaches the power tool preventionlayer 20. ln fig. 1 the layers 10, 25, 20 are arranged in the arrangement 15. Thelayers10, 20, 25 may be arranged in a cover, enclosing all layers, or the cut-prevention layer 10 may be the outermost layer. The cut-prevention layer may bee.g. cupboard-like, i.e. an enclosure enclosing all other layers 20, 25, 27, therebybeing both the outermost and the innermost layer.

[0030] The power tool prevention layer 20 may anyhow be arranged within closedistance to the cut-prevention layer 10. This signifies that when a power-drivensaw works its way through the cut-prevention layer, the saw would more or lessimmediately after breaking the cut-prevention layer come into contact with theadhesive layer and the power tool prevention layer, which would arrest the sawblade. Although, the power tool prevention layer 20 should not be so tightlyarranged to the adhesive layer 25 that the threads of the active layer stick to theadhesive material before an intrusion attack is performed which would prevent thethreads from moving freely. lf the threads cannot move freely there is a risk thatthe threads are not torn out by the saw teeth to clog the saw blade but instead arebroken by the saw teeth. To prevent such sticking of the active layer 20 threads tothe adhesive layer 25, a separating layer 27 may be arranged between the activelayer 20 and the adhesive layer 25. The separating layer 27 may be a plastic film.

Our ref: 68205

[0031] The intrusion preventing arrangement 15 can be arranged in or as a truckpanel, a hard cover for a truck, a motor boat, a door of a building or shop, e.g. aslide able door, a trailer, as a wall or door of a mobile home, camping trailer,container, shop etc.

[0032] Figure 2 shows an alternative of an intrusion preventing arrangement 15in which the power tool prevention layer 20 and the adhesive layer 25 are arranged in between two cut-prevention layers 10a, 10b.

[0033] Figure 3 shows a power tool prevention layer 20 and an adhesive layer25 arranged inside an envelope 50. Consequently, the envelope may enclose thepower tool prevention layer 20 and the adhesive layer 25. A possible separatinglayer 27 may also be arranged in the envelope, in between the adhesive layer 25and the power tool prevention layer 20. The envelope 50 may be arranged withfastening edges (not shown) around its periphery. Edges of the power toolprevention layer 20, the adhesive layer 25 and the separating layer 27 may befastened to the fastening edges of the envelope, to keep the layers 20, 25, 27 inplace in the envelope. The power tool prevention layer 20 should be fastened tothe envelope such that the threads of the active layer are not tensioned. Theenvelope 50 should preferably be arranged such that it permits the threads of theactive layer to move inside the envelope. The edges of the power tool preventionlayer 20 may be fastened to the edges of the envelope 50 by sewing (e.g. zig-zagpattern) or by melting of a plastic material arranged on the edges and pressing theedges of the envelope 50 together with the edges of the power tool preventionlayer 20. The envelope 50 may have an inner surface of a slide able material suchas aluminum or similar that facilitates the threads of the power tool preventionlayer 20 to move freely inside the envelope. The envelope 50 may be adapted insize to fit the size of a cut-prevention layer 10 with which it is going to coexist inthe same intrusion preventing arrangement 15. E.g. the envelope may be adaptedin size to a side of a truck or trailer panel.

[0034] The details ofdifferent suitable power tool prevention layers 20 will beshown and explained in relation to figures 4-8. Figure 4 shows an exemplary Our ref: 68205 power tool prevention layer 20 of textile fabric. ln the fabric illustrated in figure 4,thin-diameter threads 1 form a passive layer, and the larger-diameter threads 2form an active layer. The passive layer may also be called a binding layer orsystem. A function of the passive layer is to bind the active layer. The active layermay be a warp and weft system. The textile fabric may be a warp knit fabric/ weftinserted warp knit. Alternatively, the textile may be produced according to acircular knit or weft knit process, or the textile may be a woven or non-woventextile. The passive thread layer 1 supports the active thread layer 2 and does notactively take part in arresting the saw. The threads forming the active layer extendin a tortuous or serpentine pattern 3. The active thread layer 2 may be positionedon top of the passive thread layer 1, i.e. against a possible intruder. Consequently,the threads of the active layer will, when the power tool prevention layer is reachedby e.g. a chain saw, instantaneously be caught by the saw chain upon theircontact with the chain and be pulled out.

[0035] This embodiment may be modified in a many different ways. The passivethread layer 1 may be formed by threads that maintain the threads of the activethread layer 2 in position when the power tool prevention layer 20 is positioned inan intrusion preventing arrangement 15. Further, the threads of the active-threadlayer 2 may have such a length and may be connected to the passive-thread layersuch that they will take on a tortuous pattern allowing them to be captured by thesaw chain upon contact with the saw chain. Further, the threads of the active-thread layer 2 may be sufficiently strong in relation to the threads of the passivelayer to cause the threads of the passive-thread layer 1 to break such that thethreads of the active layer may be torn out and arrest the saw chain. ln otherwords, the threads of the active layer may be stronger than the threads of thepassive layer. Further, the threads of the active layer may be texturized.

[0036] Fig. 5 illustrates another type of fabric, wherein the threads of the activelayer 4 form a tortuous or serpentine pattern 5. The threads of the active layer maybe a coarse yarn. Like in the embodiment illustrated in fig. 4 a passive layer ofbinder threads 6 are formed. ln the embodiment of fig. 5 there are also threads 7 which are shrinkable, for instance by being exposed to heat treatment. The Our ref: 6820511 threads 7 are also bound to the passive layer. By shrinking the threads 7, theactive layer threads 4, which consist ofa non-shrinking material, will take on atortuous pattern 5 having the same function as the tortuous pattern 3 of thethreads in accordance with the embodiment of fig. 4. ln the embodiment of fig. 5there are also threads 11 arranged perpendicular to the threads 7. The threads 11may or may not be made of a shrinkable material. ln the case that the threads 11are of a shrinkable material, and if the shrinkable threads 11 are shrunk, existingactive threads (not shown) arranged in parallel to the threads 11 may take on atortuous pattern. Alternatively, the threads 11 may consist of a mixture ofshrinkable threads and non-shrinkable threads. As a result, the active layer may,after shrinking of the shrinkable threads, comprise threads taking on a tortuouspattern in two mutually perpendicular directions.

[0037] Fig. 6 shows yet another type of fabric, which is similar to theembodiment of figure 5 in as much as it comprises threads 7 of a shrinkablematerial. Also, this embodiment comprises a passive layer formed by threads 6,shown as thin threads in the figure, and serving as binder threads for binding, orconnecting, the active threads to the passive threads. The embodiment of fig. 6also comprises threads 8 of a non-shrinkable material, similar to the threads 4 ofthe active layer, but arranged perpendicular to the threads 4. Threads 11 ofshrinkable material are arranged more or less perpendicular to the threads 7 ofshrinkable material. By shrinking the shrinkable threads 11, also the threads 8 ofnon-shrinkable material will take on a tortuous or serpentine configuration 9, thetortuous portions of which may be caught by a saw chain upon contact with thelatter. As understood, figure 6 shows the fabric when the threads 7 and 11 ofshrinkable material have been shrunk such that the non-shrinkable threads of theactive layers 4 and 8 have taken on a tortuous or serpentine configuration.

[0038] Figure 7 shows an alternative type of fabric in which threads 13a, 13b ofthe active layer are texturized. Each thread may comprise up to 200, or evenmore, filaments, more or less each filament being ruffled to achieve the texturizedlayer. The threads may be texturized according to any known method. ln figure 7there are active layer threads 13a that are texturized, and that elongates in a first Our ref: 6820512 direction and there are active layer threads 13b that are texturized, and thatelongates in a second direction perpendicular to the first direction. The texturizedthreads 13a, 13b are connected to the passive layer threads 6 in a similar way asfor the other embodiments shown in figures 4-6. The passive layer threads 6 mayfunction as a binding system that binds and holds the active layer threads 13a,13b together.

[0039] Figure 8 shows another alternative type of fabric in which the active layercomprises texturized threads 16 mixed with non-texturized threads 17. Thetexturized threads 16 and the non-texturized threads 17 may or may not take on atortuous pattern. ln the alternative shown in the figure, every second thread 16 istexturized and every second thread 17 is a non-texturized thread. Although, otheralternative mixtures may be used. The active layer may also comprise threads 18that are arranged perpendicular to the threads 16 and 17. The threads 18 of fig. 8are not texturized. Although, the threads 18 may be texturized. Alternatively, thethreads 18 may comprise texturized threads mixed with non-texturized threads, asfor the threads 16 and 17.

[0040] The material of the threads of the power tool prevention layer may be offor example any type of polymer, such as polyester, polyamide, polyethylene, polypropylene and aromatic polyamide fiber, or a mixture of any of the polymers.

[0041] ln an alternative, each active layer thread may comprise a number offilaments, and each active layer thread may be enclosed by a protective sleeve.Thereby, each active layer thread becomes more robust, which makes the threadlast longer at regular usage of the intrusion preventing arrangement. At the sametime, the protective sleeve is produced such that it is easily and instantaneouslytorn up by the saw teeth of a power-driven saw so that the saw teeth gets incontact with the filaments of the active thread.

[0042] The power tool prevention layer 20 may comprise many sub-layers, forexample 3-12 sub-layers, wherein each sub-layer comprises an active layer of threads and a passive layer of threads, wherein the threads of the passive layerinterconnects the threads of the active layer. Further, the cut prevention layer 10 Our ref: 6820513 may comprise many sub-layers. Further, the adhesive layer 25 may comprise aplurality of sub-Iayers, the sub-layers possibly being separated by thin layers of plastic film, similar to the separating layer 27.

[0043] While the solution has been described with reference to specificexemplary embodiments, the description is generally only intended to illustrate theinventive concept and should not be taken as limiting the scope of the solution.

The solution is defined by the appended claims.

Claims (9)

1. An intrusion preventing arrangement (15), comprising: a cut prevention layer (10) for preventing intrusion with a hand-drivencutting device, the cut prevention layer being of a hard material that is impossibleor at least difficult to cut through with a hand-driven cutting device, such as hardplastic, composite, wood or any metal; a power tool prevention layer (20) of a textile fabric for preventingintrusion with a power-driven tool, wherein the power tool prevention layercomprises an active layer of threads (2; 4; 4,8; 13a, 13b; 16, 17, 18) that, uponcontact with a rotating arrangement of a power-driven tool, are arranged to beengaged by the rotating arrangement; an adhesive layer (25) comprising a material suitable for adhering to arotating arrangement of a power-driven tool and for adhering to the threads of theactive layer of the power tool prevention layer, wherein the adhesive layer, thepower tool prevention layer and the cut-prevention layer are arranged in afollowing order, in a direction from a possible intruder (30) towards a space to beprotected from an intruder: the cut-prevention layer (10), the adhesive layer (25),the power-tool prevention layer (20) of a textile fabric..

2. lntrusion preventing arrangement according to claim 1, wherein theadhesive layer (25) is separated from the power-tool prevention layer (20) by aseparating layer (27) of e.g. a plastic film.

3. lntrusion preventing arrangement according to any of the preceding claims, wherein the material of the adhesive layer (25) is pitch, preferably bitumen.

4. lntrusion preventing arrangement according to any of the precedingclaims, wherein the adhesive layer (25) further comprises a tool-wearing materialarranged for wearing out a rotating arrangement of a power-driven tool, the toolwearing material being for example bits of stone, ceramic, mineral and/or metal, glass. Our ref: 68205

5. lntrusion preventing arrangement (15) according to any of the precedingclaims, wherein the power-tool prevention layer (20) further comprises: a passive layer of threads (1; 6),wherein the threads of the passive layer (1; 6) interconnects the threads of theactive layer (2; 4; 4,8; 13a, 13b; 16,17, 18).

6. lntrusion preventing arrangement according to claim 5, wherein thethreads of the passive layer (1; 6) interconnects the threads of the active layer (2;4; 4, 8; 13a, 13b; 16, 17, 18) in such a way that the threads of the active layer areforced to extend in a serpentine or tortuous pattern.

7. lntrusion preventing arrangement (15) according to any of claims 5-6,wherein the threads of the active layer have such a strength in relation to astrength of the threads of the passive layer that they cause the threads of thepassive layer to break in case the threads of the active layer are caught by a rotating arrangement of a power-driven tool.

8. lntrusion preventing arrangement (15) according to any of the precedingclaims, further comprising an envelope (50), and wherein the power toolprevention layer (20) and the adhesive layer (25) are positioned inside theenvelope (50) but not the cut prevention layer (10).

9. A panel for a vehicle, such as a truck, comprising an intrusionpreventing arrangement (15) according to any of the preceding claims.