EP0151011A2 - Elément résistant de sécurité - Google Patents

Elément résistant de sécurité Download PDF

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Publication number
EP0151011A2
EP0151011A2 EP85300542A EP85300542A EP0151011A2 EP 0151011 A2 EP0151011 A2 EP 0151011A2 EP 85300542 A EP85300542 A EP 85300542A EP 85300542 A EP85300542 A EP 85300542A EP 0151011 A2 EP0151011 A2 EP 0151011A2
Authority
EP
European Patent Office
Prior art keywords
elements
pins
balls
hard
structure according
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.)
Granted
Application number
EP85300542A
Other languages
German (de)
English (en)
Other versions
EP0151011B1 (fr
EP0151011A3 (en
Inventor
Anthony John Skelton
George Thomas Allan Blakey
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
Priority claimed from GB848402012A external-priority patent/GB8402012D0/en
Priority claimed from GB848406315A external-priority patent/GB8406315D0/en
Application filed by Chubb and Sons Lock and Safe Co Ltd filed Critical Chubb and Sons Lock and Safe Co Ltd
Publication of EP0151011A2 publication Critical patent/EP0151011A2/fr
Publication of EP0151011A3 publication Critical patent/EP0151011A3/en
Application granted granted Critical
Publication of EP0151011B1 publication Critical patent/EP0151011B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0414—Layered armour containing ceramic material
    • F41H5/0421—Ceramic layers in combination with metal layers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/023—Armour plate, or auxiliary armour plate mounted at a distance of the main armour plate, having cavities at its outer impact surface, or holes, for deflecting the projectile

Definitions

  • the present invention relates to a penetration-resistant barrier structure for use in the doors or walls of safes, strongrooms and the like security enclosures and seeks in particular to provide a form of construction which can be made highly resistant to attacks with drills and punches and which will be suited especially to the localised protection of the locking points or other strategically important regions within a safe or strongroom door for example.
  • barrier structures including elements of a hard mineral or ceramic disposed in a cast matrix.
  • the hard elements are provided in the form of irregularly-shaped nuggets which must therefore be juxtaposed in a somewhat random fashion within the barrier, making it difficult to be sure that there is a sufficient depth of hard material evenly distributed throughout the barrier to provide adequate resistance over the whole of the protected area.
  • One known variation of this comprises a closely-spaced parallel array of discrete high alumina ceramic pins held in a cast aluminium alloy matrix with the longitudinal axes of the pins being arranged perpendicularly to the plane of the barrier (ie parallel to the anticipated direction of attack upon the structure), generally in accordance with the teaching in United Kingdom patent specification No 1600247. While this kind of geometrical layout of the hard elements is useful in providing a consistent degree of resistance over the protected area while minimising the volume of the expensive hard material required to protect that area, it has been found that the resistance of the known barrier structure to drilling attacks and, especially, its resistance to attacks with percussion drills, punches or the like percussive tools, is less than that which is to be desired in high security applications. This is thought to be due both to the brittle nature of the ceramic pins employed in the known structure and to the fact that a cast matrix cannot provide sufficient support for the pins to prevent failure of the pins under impact loads.
  • the present invention proposes a security barrier structure comprising a closely-spaced array of regularly-shaped hard elements of a cemented carbide material embedded in a supporting plate or other body, constructed by forcing the hard elements into respective members of an array of parallel bores prepared in the supporting body as an interference fit with the respective hard elements such that those elements are securely held under compression in the body by elastic stresses set up in the body as a result of the process of forcing in the hard elements, the longitudinal axes of said bores being aligned generally perpendicularly to the plane of the barrier.
  • the hard elements in a structure according to the invention are preferably in the form of pins or balls of the chosen cemented carbide material.
  • These materials also known as “sintered carbides” and “hard metals”, typically comprise compounds of tungsten carbide, titanium carbide or of both together and/or together with tantalum carbide, together with a small amount of a “cementing” metal such as cobalt or nickel.
  • these materials can be made with both a sufficient hardness, say at least 1400 VPN (Vickers Pyramid Number) at room temperature, to resist the cutting action of the drills or other mechanical cutting tools which are likely to be appropriated for an attack upon the structure, and with a toughness and tensile strength (or transverse rupture strength - say at least 100,000 lb/in2 (7,000 kg/cm2) which significantly exceeds that of alumina and the like ceramic materials and which confers upon elements of cemented carbide a greater inherent resistance to destruction by percussion than the ceramics. Furthermore, and most importantly, these materials can also exhibit compressive strengths of, say, at least 400,000 lb/in2 (28,000 kg/cm2) and .
  • the invention proposes to construct the structure by forcing the hard elements into interference-fit bores prepared in a supporting plate or other body.
  • the residual elastic stresses which are set up in the body as a result of this force fitting of the hard elements exhibit a tightness of hold on the elements such as to maximise resistance to extraction of the elements and to minimise the tendency of the elements to crack or chip under impact loads.
  • the hard elements are left with a significant induced compressive stress after the force-fitting step - since carbides are weaker in tension than in compression the net result of the induced compression is to increase the effective minimum stress at which failure occurs.
  • Using a steel supporting body gives the further advantage of enabling the barrier to be strongly attached to the associated structure without difficulty eg by welding or other conventional fixation techniques.
  • the form of the hard elements themselves can also be chosen so as to maximise the desired residual and induced stresses in the body and elements after force-fitting.
  • the pins In the case of hard pins, therefore, which will be pressed or driven endwise into the body, it is preferred for the pins to be tapered along much or all of their length.
  • balls may be employed, which have certain advantages from the point of view of production - they will be self-locating in the bores if poured over the surface of the supporting body and may be forced in by a rolling press.
  • each pin 1 is tapered along its length, with a shallow dome at its wider end.
  • the pins are mounted in the plate 2 with their longitudinal axes parallel to each other and the plate will be mounted in the safe door or other structure which it is intended to protect face-on to the anticipated direction of attack and with the domed ends of the pins outwards.
  • the plate 2 is drilled with an array of plain bores 3 ( Figure 3) to define the positions for the pins 1, and with a diameter to be an interference fit with the pins.
  • the narrower end of a pin 1 is then inserted into each bore 3 and the pins are pressed fully home as shown in Figure 2 whence they are securely retained,_under a considerable compressive load, by the very high elastic stresses which are induced in the steel surrounding each bore as the tapered pins progressively penetrate the plate.
  • an 8mm thick plate 2 of 50mm diameter is provided with an array of 7/64" (2.8mm) bores in the pattern shown in Figure 1 and at a pitch p of 6mm.
  • the pins 1 are 8mm long and have a nominal diameter of 2.8mm widening to 3.4mm.
  • This form of structure is particularly suitable for resisting carbide-tipped drills in the diameter range of 10-15mm; tests have shown that, when attacked, not only is progress through the barrier extremely slow due to the very low cutting rate which can be achieved in any event against the pins 1, but also the carbide drill tips are repeatedly destroyed so that the drill in use must be continually replaced if any progress at all is to be made.
  • the structure illustrated in Figures 4 and 5 comprises a closely-spaced array of discrete tungsten carbide balls 4 held in a mild steel plate 5.
  • the balls are mounted in the plate so as to lie generally in one plane and the plate will be mounted in the safe door or other structure which it is intended to protect face-on to the anticipated direction of attack and with the exposed faces of the balls outwards.
  • this barrier is drilled with an array of plain blind bores 6 ( Figure 5) to define the positions for the balls 4, and with a diameter to be an interference fit with the balls.
  • a ball 4 is then located in the mouth of each bore 6 and the balls are pressed fully home as shown in Figure 5 whence they are securely retained under compressive load by the very high elastic stresses which are induced in the steel surrounding each bore as the balls progressively penetrate the plate.
  • this process tends to maximise resistance to extraction of the forced-in carbide elements and to minimise the tendency of these elements to crack or chip under impact loads, the resultant induced compressive stress in the hard inclusions also having the net result of increasing the effective minimum (tensile) stress at which failure of the carbide material occurs.
  • a 6mm thick plate 2, 64mm square is provided with an array of 4.5mm deep 4.2mm diameter bores in the pattern shown in Figure 4 and at a pitch p' of 8mm.
  • the balls 4 have a nominal diameter of 4.37mm.
  • This form of structure is particularly suitable for resisting carbide-tipped drills in the diameter range of 10-20mm; tests have shown that, when attacked, not only is progress through the barrier extremely slow due to the very low cutting rate which can be achieved in any event against the hard balls 4, and that the spherical surfaces of the balls tend to deflect the drill, but also the carbide drill tips are repeatedly destroyed so that the drill in use must be continually replaced if any progress at all is to be made. ⁇ s before, this is due to the fact that the geometry of the barrier allows partial penetration of the drill tip into the steel plate whereupon the flanks of the carbide inserts on the drill bit impact the hard balls and are consequently broken or ripped away from the bit.
  • FIGs 6 and 7 there is shown a construction which offers still greater protection against drilling and percussion attacks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
EP19850300542 1984-01-26 1985-01-25 Elément résistant de sécurité Expired EP0151011B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8402012 1984-01-26
GB848402012A GB8402012D0 (en) 1984-01-26 1984-01-26 Security barrier structure
GB848406315A GB8406315D0 (en) 1984-03-10 1984-03-10 Security barrier structure
GB8406315 1984-03-10

Publications (3)

Publication Number Publication Date
EP0151011A2 true EP0151011A2 (fr) 1985-08-07
EP0151011A3 EP0151011A3 (en) 1986-04-09
EP0151011B1 EP0151011B1 (fr) 1989-08-16

Family

ID=26287229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850300542 Expired EP0151011B1 (fr) 1984-01-26 1985-01-25 Elément résistant de sécurité

Country Status (6)

Country Link
EP (1) EP0151011B1 (fr)
AU (1) AU571639B2 (fr)
ES (1) ES292802Y (fr)
GB (1) GB2153406B (fr)
NZ (1) NZ210987A (fr)
PT (1) PT79886B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1128154A3 (fr) * 2000-02-21 2001-11-14 Rafael Armament Development Authority Ltd. Plaque de blindage ballistique
WO2018161072A1 (fr) * 2017-03-03 2018-09-07 The American University In Cairo Plaques d'arrêt de projectile pour protection de personne, de véhicule et d'équipement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111705993B (zh) * 2020-06-24 2024-01-05 王子国 预应力约束块和复合装甲结构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE711388A (fr) * 1967-03-01 1968-08-28
DE2525738A1 (de) * 1975-06-10 1976-12-23 Danzer Josef Helmut Bohrsicheres plattenelement
GB1600247A (en) * 1978-05-11 1981-10-14 Security Lock & Safe Co Security barriers
DE2933026A1 (de) * 1979-08-16 1981-02-26 Battelle Institut E V Bauelement
FR2526535A1 (fr) * 1982-05-04 1983-11-10 Pequignot Michel Plaque de blindage, notamment pour blindage allege

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1128154A3 (fr) * 2000-02-21 2001-11-14 Rafael Armament Development Authority Ltd. Plaque de blindage ballistique
US6892623B2 (en) 2000-02-21 2005-05-17 The State Of Israel, Ministry Of Defense, Armament Development Authority Ballistic armor panel
WO2018161072A1 (fr) * 2017-03-03 2018-09-07 The American University In Cairo Plaques d'arrêt de projectile pour protection de personne, de véhicule et d'équipement

Also Published As

Publication number Publication date
GB8501862D0 (en) 1985-02-27
EP0151011B1 (fr) 1989-08-16
EP0151011A3 (en) 1986-04-09
PT79886B (en) 1986-09-11
AU571639B2 (en) 1988-04-21
NZ210987A (en) 1987-11-27
ES292802Y (es) 1987-08-01
GB2153406A (en) 1985-08-21
GB2153406B (en) 1987-04-15
PT79886A (en) 1985-02-01
ES292802U (es) 1986-12-16
AU3809685A (en) 1985-08-01

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