EP0511182A2 - Dispositif de protection contre les ondes de choc et les éclats - Google Patents

Dispositif de protection contre les ondes de choc et les éclats Download PDF

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Publication number
EP0511182A2
EP0511182A2 EP92850085A EP92850085A EP0511182A2 EP 0511182 A2 EP0511182 A2 EP 0511182A2 EP 92850085 A EP92850085 A EP 92850085A EP 92850085 A EP92850085 A EP 92850085A EP 0511182 A2 EP0511182 A2 EP 0511182A2
Authority
EP
European Patent Office
Prior art keywords
blast
canister
turns
canisters
sheet 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.)
Withdrawn
Application number
EP92850085A
Other languages
German (de)
English (en)
Other versions
EP0511182A3 (en
Inventor
Johnny Ohlson
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.)
DYNASAFE AB
Original Assignee
Dynasafe AB
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 Dynasafe AB filed Critical Dynasafe AB
Publication of EP0511182A2 publication Critical patent/EP0511182A2/fr
Publication of EP0511182A3 publication Critical patent/EP0511182A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045—Detonation-wave absorbing or damping means

Definitions

  • the present invention relates to a readily portable blast and splinter-proof screening device intended to screen off and protect the surroundings against detonation forces and any splinters formed from detonating explosive charges primarily of limited force.
  • the primary field of application of the device according to the present invention is in connection with disposal of duds from artillery firing, clearing of mine fields on land, as well as in the defusing or disarming of sabotage and terrorist charges, booby traps etc., hence primarily in respect of indicating and demarcating the surroundings from the effects of explosive charges which are located at undesirable places and cannot be rendered harmless or moved to a safe place without risk.
  • the device according to the present invention may also be employed to protect the surroundings when it becomes necessary to carry out a detonation for other reasons in the immediate vicinity of such matter as could be damaged by the detonation.
  • blast canister In the absence of any previous, generally accepted designation of a product of the type under consideration here, the product will hereinafter be referred to as a "blast canister".
  • the present invention also encompasses a method of producing the blast canister in question.
  • the major characterizing feature of the blast canister according to the present invention is that it functions according to the double principle of first deflecting as large a proportion as possible of the detonation force formed on detonation of an explosive charge placed in the canister, as well as any splinters formed thereby, in a direction which is harmless to the immediate surroundings, i.e. in most cases in an upward direction, and then absorbing the remaining detonation force itself.
  • the inventive concept further includes the feature that the device is not to be excessively robust, but that, on the contrary, deformation possibilities may be accepted (and even incorporated in its design) which may be utilized to convert the detonating forces into mechanical work.
  • the blast canister according to the present invention is thus as a rule consumed or spent after one detonation, but this drawback is many times cantered by the fact that it is possible to make the device according to the present invention easy to handle and relatively cheap in manufacture.
  • the blast canister consists of a plurality of layers of helically wound sheet of a width progressively reducing after the first turn or turns, either being wound inwardly or outwardly. This design only needs to be held together by spot welding so that it keeps together up to the point when it is exposed to an interior detonation. In the rapid cycle which the detonation implies, it will in fact be the friction between the sheet layers which is primarily responsible for cohesion between the sheet layers.
  • the blast canister By manufacturing the blast canister from helically wound sheet metal, it is possible to make use of the high specific mechanical strength values of the thinner sheet metal material, while achieving a simple production process and by causing the sheet metal to be of progressively smaller width, i.e. departing from a substantially triangular sheet metal configuration after the first turn or turns, there will be obtained a blast canister with increasingly thicker walls in a downward direction. Envisaging that the blast canister is placed about a charge disposed on or in ground level with its thicker wall portion down towards ground level, a blast canister will thus have been realized which possesses maximum strength at that region which will be exposed to the greatest stress.
  • blast canisters By commencing the helical winding of the sheet metal either with its narrowest or broadest portion, it is possible to produce blast canisters with either a substantially smooth and whole outer face or a substantially smooth and whole inner face. This makes it possible to produce blast canisters pairwise which fit closely into one another and which may be employed together as soon as the suspicion is raised that a single canister might be a little on the weak side. Correspondingly, several such pairs may be given progressively larger diameters so that they fit into one another in order to make for ease of transport. In the case of blast canisters of equal strength, these may be produced irrespective of their own inside diameter- from helically wound sheet metal pieces of the same length, but if the angle of deflection from the site of detonation (i.e.
  • the centre of the bottom plane of the blast canister is to be the same irrespective of the canisters, the different blast canister pairs must be made progressively taller in dependence upon its own inside diameter, i.e. must be manufactured from progressively wider sheet metal even though such sheet metal can be kept of equal length for all pairs. This latter is because the detonation force fades with distance and consequently the blast canisters will fulfil their purpose with progressively smaller wall thickness according as their diameters increase.
  • the blast canister is an open cylinder whose largest material thickness faces towards ground level.
  • jump mines which are thrown by a small propellant charge a metre or so into the air before bursting.
  • the blast canister is therefore provided with a permanently mounted grid top which, if it is upset or clinched along the edges so that it first extends obliquely up from the upper sheet metal edge of the blast canister in order thereafter to form a substantially planar grid top, its obliquely inclined edge portion may offer a useful handle for lifting and short-distance transport.
  • the blast canister will, in this manner, prove useful as a seat during work breaks.
  • each metal sheet begins with a portion of uniform width 1a' and 1 b', of which 1 a' is, however, somewhat narrower than 1 b' - this in order that the finished blast canister parts be capable of fitting in one another.
  • the screened angle of each respective canister portion seen from the centre of its bottom plane, will be substantially equal by such means, since the canister with the larger diameter (in this case manufactured from the sheet 1 b) will also be the taller.
  • the central region of the sheet metal has been omitted, since the figure would otherwise be on an unacceptably small scale.
  • the metal sheet is 10 metres in length, 500 mm in width and 2 mm in thickness.
  • the sheet 1a is now helically wound, counting from the tip, in tightly adjacent turns in which the first turn may, for example, have an inside diameter of 430 mm.
  • the inner blast canister portion 3 shown in Fig. 1 will have been obtained.
  • the various sheet metal turns are held together by permeating spot welds marked 4 on the figure.
  • the two first turns may possibly also be edge-welded as well. This has been marked by reference No. 5 on the figure.
  • both of the blast canisters are provided with a grid roof or top 7 and 8, respectively, in the form of a powerful mesh shaped like a lid with a planar top surface 7a and 8a, respectively, covering the major portion of the upper surfaces of the canisters, and obliquely bevelled edge portions 7b and 8b, respectively.
  • the mesh is fixedly welded to the upper edges of each respective blast canister portion.
  • the blast canister illustrated in Figs. 1 and 2 is now ready for use and is then quite simply placed over the charge which it is desired to screen off from the surroundings for reasons of protection so that the charge is located in the centre of the canister. If it is certain that the charge is small, only one of the canister parts may possibly be used.
  • the canister will have its greatest mechanical strength and the material thickness closest to the charge, i.e. closest to ground level.
  • the employment of rolled sheet metal also makes it possible to utilize to the full the superior specific strength of the sheet metal material, implying that the blast canisters may be made relatively light and at a relatively low cost. Since it is primarily the friction between the different sheet metal turns that must absorb the extremely rapid cycle of the detonation, it is not necessary to place any specific requirements on the spot welding and the edge welding (if any) other than that they must prevent the sheet metal from unwinding prior to use.
  • the grid top or mesh is intended to prevent jump charges from being ejected out of the canister. Otherwise, no major requirements are placed on the grid or mesh. For example, it would be of no consequence if the grid top is torn apart and splintered by the detonation force, as long as it ensures that the detonation proper actually takes place within the blast canister.
  • Fig. 4 shows four different double blast canisters 9-16 nested in one another and ready for transport. These may be produced from the same sheet metal material and from sheet metal of the same length but of progressively increasing width.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Resistance Welding (AREA)
EP19920850085 1991-04-24 1992-04-15 A blast and splinter proof screening device and a method of manufacturing same Withdrawn EP0511182A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101228A SE502616C2 (sv) 1991-04-24 1991-04-24 Tryck- och splittertålig avskärmningsanordning samt sätt att framställa densamma
SE9101228 1991-04-24

Publications (2)

Publication Number Publication Date
EP0511182A2 true EP0511182A2 (fr) 1992-10-28
EP0511182A3 EP0511182A3 (en) 1993-04-14

Family

ID=20382544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920850085 Withdrawn EP0511182A3 (en) 1991-04-24 1992-04-15 A blast and splinter proof screening device and a method of manufacturing same

Country Status (2)

Country Link
EP (1) EP0511182A3 (fr)
SE (1) SE502616C2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012496A1 (fr) * 1996-09-20 1998-03-26 Alliedsignal Inc. Ensembles de conteneurs resistant aux explosions et orientant ces dernieres
EP1161308A1 (fr) * 1998-12-23 2001-12-12 Thermo Black Clawson Inc. Cylindre classeur a element tamis helicoidal pour machine a papier
US6341708B1 (en) 1995-09-25 2002-01-29 Alliedsignal Inc. Blast resistant and blast directing assemblies
US7185778B1 (en) 1995-09-25 2007-03-06 Allied-Signal Inc. Barrier units and articles made therefrom
US7430952B2 (en) 2002-06-25 2008-10-07 Sema Protective device for the confinement of explosive objects or objects suspected to be such
EP2762826A1 (fr) * 2013-02-05 2014-08-06 Umwelt-Technik-Metallrecycling GmbH Dispositif destiné à éliminer une matière explosive
WO2023142259A1 (fr) * 2022-01-29 2023-08-03 北京理工大学 Dispositif d'élimination et de protection d'explosif à sécurité intrinsèque et procédé d'utilisation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800715A (en) * 1971-09-30 1974-04-02 W Boller Bomb recovery and shield apparatus
FR2317124A1 (fr) * 1975-06-28 1977-02-04 Widmer Walter Vehicule de transport pour matieres explosives
GB2041178A (en) * 1979-01-30 1980-09-03 Sacks M Protective screen
GB2110179A (en) * 1981-10-02 1983-06-15 Jet Research Center Blast attenuator
EP0204863A1 (fr) * 1984-02-10 1986-12-17 Rockwood Systems Corporation Procédé de contrôle d'une explosion
FR2607240A1 (fr) * 1986-11-21 1988-05-27 Matra Manurhin Defense Dispositif de protection pour le transport ou le stockage de charges explosives
FR2608268A1 (fr) * 1986-12-16 1988-06-17 Thomson Brandt Armements Dispositif pour arreter les eclats d'un engin explosif

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800715A (en) * 1971-09-30 1974-04-02 W Boller Bomb recovery and shield apparatus
FR2317124A1 (fr) * 1975-06-28 1977-02-04 Widmer Walter Vehicule de transport pour matieres explosives
GB2041178A (en) * 1979-01-30 1980-09-03 Sacks M Protective screen
GB2110179A (en) * 1981-10-02 1983-06-15 Jet Research Center Blast attenuator
EP0204863A1 (fr) * 1984-02-10 1986-12-17 Rockwood Systems Corporation Procédé de contrôle d'une explosion
FR2607240A1 (fr) * 1986-11-21 1988-05-27 Matra Manurhin Defense Dispositif de protection pour le transport ou le stockage de charges explosives
FR2608268A1 (fr) * 1986-12-16 1988-06-17 Thomson Brandt Armements Dispositif pour arreter les eclats d'un engin explosif

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6341708B1 (en) 1995-09-25 2002-01-29 Alliedsignal Inc. Blast resistant and blast directing assemblies
US7185778B1 (en) 1995-09-25 2007-03-06 Allied-Signal Inc. Barrier units and articles made therefrom
WO1998012496A1 (fr) * 1996-09-20 1998-03-26 Alliedsignal Inc. Ensembles de conteneurs resistant aux explosions et orientant ces dernieres
EP1161308A1 (fr) * 1998-12-23 2001-12-12 Thermo Black Clawson Inc. Cylindre classeur a element tamis helicoidal pour machine a papier
EP1161308A4 (fr) * 1998-12-23 2002-05-29 Thermo Black Clawson Inc Cylindre classeur a element tamis helicoidal pour machine a papier
US7430952B2 (en) 2002-06-25 2008-10-07 Sema Protective device for the confinement of explosive objects or objects suspected to be such
EP2762826A1 (fr) * 2013-02-05 2014-08-06 Umwelt-Technik-Metallrecycling GmbH Dispositif destiné à éliminer une matière explosive
WO2023142259A1 (fr) * 2022-01-29 2023-08-03 北京理工大学 Dispositif d'élimination et de protection d'explosif à sécurité intrinsèque et procédé d'utilisation

Also Published As

Publication number Publication date
EP0511182A3 (en) 1993-04-14
SE9101228D0 (sv) 1991-04-24
SE502616C2 (sv) 1995-11-27
SE9101228L (sv) 1992-10-25

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