EP0067616B1 - Security barrier structure - Google Patents

Security barrier structure Download PDF

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Publication number
EP0067616B1
EP0067616B1 EP82302830A EP82302830A EP0067616B1 EP 0067616 B1 EP0067616 B1 EP 0067616B1 EP 82302830 A EP82302830 A EP 82302830A EP 82302830 A EP82302830 A EP 82302830A EP 0067616 B1 EP0067616 B1 EP 0067616B1
Authority
EP
European Patent Office
Prior art keywords
layer
structure according
corrugated
matrix
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82302830A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0067616A2 (en
EP0067616A3 (en
Inventor
Raymond Leonard Sands
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gunnebo UK Ltd
Original Assignee
Chubb and Sons Lock and Safe Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chubb and Sons Lock and Safe Co Ltd filed Critical Chubb and Sons Lock and Safe Co Ltd
Priority to AT82302830T priority Critical patent/ATE19128T1/de
Publication of EP0067616A2 publication Critical patent/EP0067616A2/en
Publication of EP0067616A3 publication Critical patent/EP0067616A3/en
Application granted granted Critical
Publication of EP0067616B1 publication Critical patent/EP0067616B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
    • E05G1/00—Safes or strong-rooms for valuables
    • E05G1/02—Details
    • E05G1/024—Wall or panel structure

Definitions

  • the present invention relates to barrier structures for use e.g. in the walls and/or doors of safes, strongrooms and the like security enclosures.
  • Barrier structures provided for this purpose must have a high degree of resistance to the various forms of burglarious attack to which the enclosure may be subjected and it is an aim of the invention to provide an improved security barrier structure in which materials resistive to different classes of burglary tools can be combined in a particularly effective manner.
  • a security barrier structure disclosed in FR-A-1427488 comprises a corrugated hard steel sheet which is itself drill-resistant by virtue of its hardness but not toughness.
  • a security barrier structure comprising a flat sheet of copper intimately embedded within a matrix of cast aluminium containing also grains of corundum (alumina). Copper, being a tough and heat-conductive metal, is difficult to penetrate with percussive and thermal tools. Corundum, on the other hand, being extremely hard, resists penetration by mechanical cutting tools. A structure made in accordance with this prior art can therefore offer good resistance to attack by a burglar armed with any one of these classes of tool. Such a structure does, however, have drawbacks from the point of view of resisting a multiple-tool burglarious attack. More particularly copper, by virtue of its inherent softness, is easily cut by "sharp-edge" tools.
  • the present invention seeks to overcome this drawback of the prior art and to provide a security barrier structure which is capable of resisting both "single-tool” and “multiple-tool” attacks in an optimum manner.
  • the invention provides a structure of the type disclosed in FR-A-2367898 which comprises a layer of tough, heat-conductive metal such as to resist penetration by percussive and thermal tools, said layer being generally aligned with the plane of the barrier and disposed in intimate relation within a matrix consisting of, or containing elements of, hard material such as to resist penetration by mechanical cutting tools.
  • This structure is characterised in that said metal layer is of a corrugated shape sized and arranged so as to provide that an attempt to cut a core through that layer with a cylindrical mechanical cutting tool having a selected diameter in the range of 40-125 mm, from substantially any position outside the structure and in a direction generally perpendicular to the plane of said layer will result in the encountering of the tool with a portion of said hard material which is located on that side of the corrugated layer which is remote from the outside face of the structure, before the tool penetrates through the full thickness of the metal around the whole circumference of the core.
  • a particularly preferred material from which the aforesaid corrugated metal layer may be made is copper, alternatives including stainless steel, aluminium and cast iron.
  • the matrix within which the corrugated metal is disposed preferably contains, (at least in that portion of the matrix which is behind the corrugated metal layer in relation to an attack from outside the enclosure), at least 10% by volume of a material whose hardness is in excess of 1000 kg / mm2.
  • Suitable matrix materials therefore include security-formulation concretes containing hard aggregates such as quartzite or fused alimina (and which may also be reinforced with steel or polypropylene fibres), and composites such as cast aluminium or copper containing nuggets of fused alumina or the like hard material.
  • the copper or other said corrugated metal layer can confer upon a barrier structure according to the invention good resistance to attack by oxy-acetylene, oxy-arc and the like thermal tools, and can also provide good resistance to power percussion tools by virtue of its ability to deform without fragmentation under the action of such tools (i.e. its toughness).
  • this metal layer would be, in isolation, vulnerable to attack by "sharp edge" mechanical cutting tools such as holesaws, but these can be resisted in a structure according to the invention by the hard material in the surrounding matrix. It is in this respect that the specified corrugated form of the metal layer is of particular advantage.
  • any such tool adapted to cut out a core of the specified diameter which is applied to the corrugated layer will inevitably encounter some of the hard material in the matrix behind the corrugated layer before the metal is completely penetrated.
  • This action will of course rapidly blunt the tool edge, and once blunted cutting tools become very inefficient against ductile metals.
  • the structure can offer high resistance even to multiple attacks which attempt to penetrate the barrier structure firstly by removing a portion of the matrix material in front of the corrugated metal layer by one class of tool to which the matrix is more vulnerable than the corrugated metal, and then attacking the exposed corrugated metal with another class of tool to which that layer is perceived to be more vulnerable than the matrix.
  • the corrugated shape of the internal metal layer may indeed also assist in resisting the first stage of such an attack as considerably more difficulty may be experienced in removing the matrix material which is lodged in the troughs or other depressions in the surface of the corrugations than in the case of, say, an equivalent material provided as a flat layer.
  • the copper or like metal layer is also of advantage in resisting another class of tool, namely diamond-tipped drills and similar abrasive tools which depend for their operation on the continual wearing down of the tool tip to expose new abrasive particles; when such a tool encounters the corrugated layer in a structure according to the invention it will rapidly become clogged by the ductile metal.
  • a structure in accordance with the invention may also offer high resistance to attacks using explosives as the internal metal layer can act effectively to retain the integrity of the barrier when subjected to shock loading, and such a structure can furthermore provide the appropriate combination of hard and tough materials for resisting ballistic projectiles and the like.
  • the corrugated form of the metal must be related to the tool size and direction of advance such as to provide that parts of the tool tip will at one and the same time encounter a portion of the metal layer and a portion of the hard material behind it.
  • a simple type of corrugation comprising parallel rows of alternate peaks and troughs can be provided by relatively inexpensive sheet or plate forming techniques and can be effective, by appropriate selection of the dimensions of the corrugations, to ensure that the above-mentioned blunting effect takes place for a wide range of the tool sizes and directions of attack that would be likely to be met in practice.
  • the amplitude of the corrugations (that is the peak-to-trough height measured at the same surface) is preferably 5-15 mm more than the thickness of the metal in the corrugated layer, so that for an element made from, say, a 10 mm thick sheet the amplitude may be about 20 mm. Larger amplitudes do not in general detract from security but are likely to be impractical in safes for example where the wall thickness is limited. It has also been found that the pitch of the corrugations (that is the peak-to-peak or trough-to-trough distance) preferably lies in the range between one half and twice the diameter of the typical penetration which the barrier is intended to resist.
  • a corrugation pitch of between 60 and 250 mm may be best, therefore, or for resisting a 40 mm diameter penetration the preferred pitch may be between 20 and 80 mm.
  • a pitch of about 70 mm might therefore be chosen for optimum resistance to the whole range of penetration diameters from 40-125 mm.
  • the pitch and amplitude will in general be interrelated such that the angle subtended to the plane of the barrier by an imaginary straight line drawn between an adjacent peak and trough is in the range of 5-60°.
  • corrugated forms may be provided instead of the parallel peak-and-trough form indicated above, for example where there are ridges running in two or more different directions or where there are a plurality of discrete depressions or obtrusions distributed over the surface of the metal layer - such a layer could be described as being generally of "eggbox" shape - and the term “corrugated” is accordingly to be interpreted broadly.
  • Metal elements of these shapes may be more appropriately produced by casting from the molten metal than by sheet-forming.
  • Structures according to the invention may be produced e.g. in the form of flat slabs for incorporation into the walls and doors of safes or strongrooms.
  • the barrier structure is of "monolithic" form including a suitably interconnected series of the metal layers (e.g. one each for the back, top, bottom and two side walls of the safe) disposed within a single "bell" of cast matrix material.
  • the main corrugated metal element(s) in any such structure it is also possible to incorporate specially formed strips or plates of the same or similar metal into the same matrix to give even greater resistance to penetration in particularly important areas of a security enclosure door or body.
  • the barrier structure will generally be built up on a backing plate which supports and locates the structure in relation to the completed enclosure, (that is the backing plate is located behind the aforesaid matrix and corrugated layer, and may define the inner skin of a safe body for example).
  • the overall structure may then comprise anchors secured to the backing plate and extending into the mass of the matrix material to secure the latter to the plate.
  • anchors extend through apertures in the corrugated metal and are interconnected in front of that layer by a network of tie members.
  • a barrier structure it may be of advantage to have the internal metal layer coated with an electrically insulating and/or fume-generating substance; one substance which could provide both properties is bitumen, for example, but others are possible. If the internal metal layer can be electrically insulated in this way from the usual steel skins or other metal constituents of the security enclosure then it will be very difficult to penetrate the barrier using tools - such as the oxy-arc torch - which depend for their operation on striking an arc. The ability of such a coating to produce fumes when heated will be of value in hindering thermal attacks in general.
  • FIG. 1 there is shown a high strength steel backing plate 1 to which is secured an integral barrier structure comprising a corrugated wrought copper plate 2 disposed in intimate relation within a matrix of cast aluminium alloy 3 containing also nuggets of fused alumina 4 - (e.g. ALOXITE - Registered Trade Mark) or the like very hard, refractory material.
  • an integral barrier structure comprising a corrugated wrought copper plate 2 disposed in intimate relation within a matrix of cast aluminium alloy 3 containing also nuggets of fused alumina 4 - (e.g. ALOXITE - Registered Trade Mark) or the like very hard, refractory material.
  • the thickness a of the copper plate was 13 mm
  • the minimum thickness b of matrix material between the copper plate 2 and backing plate 1 was 25 mm
  • the amplitude c of the corrugations in plate 2 was 24 mm
  • the pitch d of the corrugations was in the region of 100-150 mm
  • the overall thickness e of the integral barrier was 65 mm.
  • a structure of this type has a high resistance to attack by a wide range of thermal and mechanical tools, and the corrugated form of the copper plate in this embodiment is such as to ensure that the tip of any mechanical cutting tool which is adapted to form a "handhole" size aperture in the plate and which is advanced through the barrier from the outside (that is the side remote from the plate 1) will encounter hard elements 4 in the matrix behind the plate 2 before that plate can be completely penetrated.
  • Rows of "L" anchors 5 ( Figure 2) are welded to the backing plate 1 and the preformed plate 2 is fitted over these anchors, the plate 2 first having been prepared with appropriately spaced holes 6 in the troughs of selected corrugations (as illustrated), or elsewhere, for this purpose.
  • Cross rods 7 are introduced to run over the surface of the plate 2 and beneath the respective anchors 5 in each row, and the assembly of rods 7 and anchors 5 is welded together.
  • the rods 7 and anchors 5 serve accurately to define the position of the plate 2 in relation to the remainder of the structure during the subsequent steps of manufacture and, most importantly, offer high resistance to separation of the completed security barrier from the backing plate.
  • the plate 1 After welding up the rods and anchors the plate 1 is assembled with a re-usable mould structure to define an appropriate mould cavity around the plate 2, and the ALOXITE or like nuggets 4 are introduced into the resulting volume. The whole is then preheated and molten aluminium alloy is poured into the cavity to form the matrix 3, the aluminium completely filling the interstices between the nuggets 4 and plates 1 and 2. The aluminium flows around both sides of the copper plate 2 and through the holes 6 and further prepared holes 8 in the plate so that the plate is intimately embedded in the resultant matrix. Finally, when the casting has cooled the plate 1 is removed from the mould structure to leave a security barrier of the form shown in Figures 1 and 2.
  • FIG. 3 this shows one example of the practical application to a security enclosure of barrier structures according to the invention.
  • the door 9 and body 10 of a safe incorporate, respectively, slab and "bell" type barrier structures comprising copper plates 2 in aluminium/alumina matrices 3/4 as previously described, the corrugations in the door plate 2 being shown running vertically and the corrugations in the body plate 2 being shown running horizontally.
  • wrought copper strips 11 and 12 are integrated into the respective barrier structures at positions adjacent to the junction between the door edge and safe body.
  • These strips 11 and 12 are especially useful in protecting against a torch attack on the door bolts 13 and their detentions 14 in the safe body - in particular they will resist attempts to widen the gap 15 between the door and body in an effort to direct a torch at the bolts 13/detentions 14 at a favourable angle through that gap.
  • FIG 4 there is shown another embodiment of a barrier structure in accordance with the invention.
  • a corrugated wrought copper plate 2' anchored to a backing plate 1' generally as described before, but in this case the plate 2' is disposed within a matrix 3' of hard security concrete of a total thickness of, say, 150 mm.
  • the plate 2' is secured to the plate 1' by anchors 5' and rods 7' functionally equivalent to the anchors 5 and rods 7 previously described, additional anchors 16 and rods 17 also being provided to increase resistance to separation of the concrete 3' from the plate 2'.
  • An outer finishing skin is indicated at 18.
  • the concrete 3' is preferably a fibre-reinforced concrete and contains a high proportion of quartzite or other selected very hard aggregate.

Landscapes

  • Radar Systems Or Details Thereof (AREA)
  • Building Environments (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Special Wing (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Support Of Aerials (AREA)
  • Processing Of Solid Wastes (AREA)
  • Road Signs Or Road Markings (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Endoscopes (AREA)
  • Wrappers (AREA)
  • Panels For Use In Building Construction (AREA)
  • Materials For Medical Uses (AREA)
EP82302830A 1981-06-11 1982-06-02 Security barrier structure Expired EP0067616B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82302830T ATE19128T1 (de) 1981-06-11 1982-06-02 Sicherheitssperrenaufbau.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8117969 1981-06-11
GB8117969 1981-06-11

Publications (3)

Publication Number Publication Date
EP0067616A2 EP0067616A2 (en) 1982-12-22
EP0067616A3 EP0067616A3 (en) 1983-05-18
EP0067616B1 true EP0067616B1 (en) 1986-04-09

Family

ID=10522446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302830A Expired EP0067616B1 (en) 1981-06-11 1982-06-02 Security barrier structure

Country Status (16)

Country Link
EP (1) EP0067616B1 (es)
JP (1) JPS58583A (es)
AT (1) ATE19128T1 (es)
AU (1) AU547616B2 (es)
CA (1) CA1172516A (es)
DE (1) DE3270377D1 (es)
DK (1) DK258982A (es)
ES (1) ES275058Y (es)
FI (1) FI822008A0 (es)
HK (1) HK80385A (es)
IE (1) IE52730B1 (es)
MY (1) MY8600237A (es)
NO (1) NO821935L (es)
NZ (1) NZ200895A (es)
PT (1) PT75037B (es)
ZA (1) ZA824029B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20010647U1 (de) * 2000-06-21 2001-10-31 Burg-Wächter KG Alfred Lüling, 58540 Meinerzhagen Datensicherungsschrank

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022677U (ja) * 1983-04-06 1985-02-16 株式会社　熊平製作所 金庫用防御壁
EP0150665B1 (de) * 1984-01-25 1989-01-11 Hügli Ingenieurunternehmung Beton-Sicherheitswand
FR2716232B1 (fr) * 1994-02-15 1996-04-26 Haffner Tech Sa Paroi blindée pour coffres ou autres enceintes à protéger.
FR2730520B1 (fr) * 1995-02-15 1997-04-11 Haffner Tech Sa Paroi blindee pour coffres ou autres enceintes a proteger
ES2299296B1 (es) * 2005-07-15 2009-10-08 Talleres Bou, S.L. Armario para productos toxicos, peligrosos e inflamables.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB891520A (en) * 1960-12-12 1962-03-14 Platforadling Ab Improvements in or relating to wall structures for safes and the like
FR1427488A (fr) * 1965-03-24 1966-02-04 Perfectionnement à la construction des coffres-forts
FR2367898A1 (fr) * 1976-10-13 1978-05-12 Fichet Bauche Paroi anti-effraction
ZA784277B (en) * 1978-07-27 1979-11-28 Abercom Africa Ltd Security enclosures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20010647U1 (de) * 2000-06-21 2001-10-31 Burg-Wächter KG Alfred Lüling, 58540 Meinerzhagen Datensicherungsschrank

Also Published As

Publication number Publication date
PT75037B (en) 1983-12-23
IE821343L (en) 1982-12-11
CA1172516A (en) 1984-08-14
AU8467082A (en) 1982-12-16
EP0067616A2 (en) 1982-12-22
NO821935L (no) 1982-12-13
JPS58583A (ja) 1983-01-05
ZA824029B (en) 1983-04-27
DE3270377D1 (en) 1986-05-15
MY8600237A (en) 1986-12-31
DK258982A (da) 1982-12-12
FI822008A0 (fi) 1982-06-07
ES275058U (es) 1984-05-16
HK80385A (en) 1985-10-25
NZ200895A (en) 1984-12-14
AU547616B2 (en) 1985-10-27
ES275058Y (es) 1984-12-16
ATE19128T1 (de) 1986-04-15
PT75037A (en) 1982-07-01
EP0067616A3 (en) 1983-05-18
IE52730B1 (en) 1988-02-03

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