WO1995004252A1 - Shaped charge for the destruction of ammunition underwater - Google Patents

Shaped charge for the destruction of ammunition underwater Download PDF

Info

Publication number
WO1995004252A1
WO1995004252A1 PCT/GB1994/001620 GB9401620W WO9504252A1 WO 1995004252 A1 WO1995004252 A1 WO 1995004252A1 GB 9401620 W GB9401620 W GB 9401620W WO 9504252 A1 WO9504252 A1 WO 9504252A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow member
disrupter
wall portion
disc
disruptable
Prior art date
Application number
PCT/GB1994/001620
Other languages
French (fr)
Inventor
David Bailey
Trevor Denman
Original Assignee
Baesema Limited
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 Baesema Limited filed Critical Baesema Limited
Priority to EP94921739A priority Critical patent/EP0689662A1/en
Publication of WO1995004252A1 publication Critical patent/WO1995004252A1/en
Priority to NO951298A priority patent/NO951298L/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/08—Blasting cartridges, i.e. case and explosive with cavities in the charge, e.g. hollow-charge blasting cartridges

Definitions

  • SHAPED CHARGE FOR THE DESTRUCTION OF AMMUNITION UNDERWATER This invention relates to disposal apparatus for use underwater and more particularly but not exclusively to ballistic disc explosive ordnance disposal apparatus.
  • the invention also relates to conversion apparatus for facilitating the operation underwater of an existing ballistic disc ordnance disposal apparatus.
  • Explosive-driven ballistic disc devices have been used for the safe disposal of ordnance items in air.
  • a metal cylinder containing an explosive charge has a detonator at one end while the other end is closed by a cup-shaped copper disc.
  • the cup-shaped profile of the disc protrudes into a matching depression in the explosive charge, i.e. a shaped charge is formed.
  • the disc is directed towards the item to be disposed of and the explosive charge detonated. This drives the disc to the item and the item is destroyed.
  • disposal apparatus for use underwater, the apparatus comprising an enclosure which is sealed for excluding water therefrom and which contains explosive material and a disrupter member having one side adjacent to the explosive material and the other side facing but spaced from a disruptable wall portion of the enclosure for detonation of the explosive material to propel the disrupter member to and through the said wall portion and then impacting upon an item for disposal near which item the apparatus is positioned when ready for use.
  • apparatus for underwater operation of a ballistic disc ordnance disposal device comprising an elongated hollow member, a disruptable cover at one end of the hollow member, and attachment means for connecting the other end of the hollow member to a ballistic disc ordnance disposal device for the ballistic disc of the device to be exposed to the interior of the hollow member and to face but remain spaced from said one end thereof, and for the said interior of the hollow member to be sealed to exclude water therefrom.
  • the disposal device comprises a hollow metal cylinder 1 containing a shaped explosive charge 2.
  • the end 3 of the cylinder 1 is fitted with an electrical detonator 4.
  • the other end 5 of the cylinder 1 is closed by a copper disc 6.
  • the disc is cup-shaped to fit into a depression 7 at this end of the shaped charge 2.
  • the disposal device When used in air, the disposal device would be positioned with end 5 facing but spaced from the item to be destroyed. The explosive charge is then detonated and the disc is propelled onto the item.
  • conversion apparatus including an aluminium extension cylinder 8 into one end of which there is fitted the end 5 of cylinder 1.
  • the two cylinders are fixed and sealed together by epoxy adhesive 9.
  • a clamp or other attachment device 10 is provided for fixing the device adjacent to an item to be destroyed.
  • an item might be a limpet mine on a ship's hull, and the device 10 should then be suitable for fixing the disposal device to that hull.
  • the other end of the cylinder 8 is closed by a thin end plate 11 which might be less than 0.5mm thick for preference or could be even made of foil.
  • the conversion apparatus also includes a water-tight sealing member 12 fitted to the detonator end of the cylinder 1.
  • This member 11 comprises an aluminium plug 13, with plastic 0-ring seals 14 and grub-screw 15 to secure it.
  • the disc 6 is driven forward through cylinder 8 and end cover plate 11 to impact the item to be disposed of.
  • Cylinder 8 provides an air space in which disc 8 can gain sufficient speed to destroy the item.
  • the cylinders 1 and 8 could be made, say of plastics material, as an integral whole.
  • the complete disposal apparatus could be incorporated into an underwater item of equipment or weapon for use as a self-destruct system.

Abstract

Ballistic disc ordnance disposal device adapted for better efficiency underwater has an air-filled extension cylinder (8) attached to the disc end of a shaped charge container (1). On detonation, the disc (7) is driven through the extension cylinder (8) and through a relatively thin end cover plate thereof (11). The extension cylinder provides an air-filled space that permits the disc (7) to gain sufficient speed to destroy say a limpet mine.

Description

SHAPED CHARGE FOR THE DESTRUCTION OF AMMUNITION UNDERWATER This invention relates to disposal apparatus for use underwater and more particularly but not exclusively to ballistic disc explosive ordnance disposal apparatus. The invention also relates to conversion apparatus for facilitating the operation underwater of an existing ballistic disc ordnance disposal apparatus.
Explosive-driven ballistic disc devices have been used for the safe disposal of ordnance items in air. In one such device, a metal cylinder containing an explosive charge has a detonator at one end while the other end is closed by a cup-shaped copper disc. The cup-shaped profile of the disc protrudes into a matching depression in the explosive charge, i.e. a shaped charge is formed. In use, the disc is directed towards the item to be disposed of and the explosive charge detonated. This drives the disc to the item and the item is destroyed.
Underwater, e.g.. to dispose of limpet mines and such, such devices are less effective.
According to one aspect of the invention, there is provided disposal apparatus for use underwater, the apparatus comprising an enclosure which is sealed for excluding water therefrom and which contains explosive material and a disrupter member having one side adjacent to the explosive material and the other side facing but spaced from a disruptable wall portion of the enclosure for detonation of the explosive material to propel the disrupter member to and through the said wall portion and then impacting upon an item for disposal near which item the apparatus is positioned when ready for use.
According to another aspect of the invention, there is provided apparatus for underwater operation of a ballistic disc ordnance disposal device, the apparatus comprising an elongated hollow member, a disruptable cover at one end of the hollow member, and attachment means for connecting the other end of the hollow member to a ballistic disc ordnance disposal device for the ballistic disc of the device to be exposed to the interior of the hollow member and to face but remain spaced from said one end thereof, and for the said interior of the hollow member to be sealed to exclude water therefrom.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, the single figure of which is a sectional view of an explosive ballistic-disc disposal device which has been converted for better operation underwater.
The disposal device comprises a hollow metal cylinder 1 containing a shaped explosive charge 2. The end 3 of the cylinder 1 is fitted with an electrical detonator 4. The other end 5 of the cylinder 1 is closed by a copper disc 6. The disc is cup-shaped to fit into a depression 7 at this end of the shaped charge 2.
When used in air, the disposal device would be positioned with end 5 facing but spaced from the item to be destroyed. The explosive charge is then detonated and the disc is propelled onto the item.
To make the device better suited for use underwater, there has been provided conversion apparatus including an aluminium extension cylinder 8 into one end of which there is fitted the end 5 of cylinder 1. The two cylinders are fixed and sealed together by epoxy adhesive 9.
A clamp or other attachment device 10 is provided for fixing the device adjacent to an item to be destroyed. For example, one item might be a limpet mine on a ship's hull, and the device 10 should then be suitable for fixing the disposal device to that hull.
The other end of the cylinder 8 is closed by a thin end plate 11 which might be less than 0.5mm thick for preference or could be even made of foil. The conversion apparatus also includes a water-tight sealing member 12 fitted to the detonator end of the cylinder 1. This member 11 comprises an aluminium plug 13, with plastic 0-ring seals 14 and grub-screw 15 to secure it. On detonation of charge 2, the disc 6 is driven forward through cylinder 8 and end cover plate 11 to impact the item to be disposed of. Cylinder 8 provides an air space in which disc 8 can gain sufficient speed to destroy the item. Instead of comprising a separate disposal device and conversion apparatus, the cylinders 1 and 8 could be made, say of plastics material, as an integral whole.
The complete disposal apparatus could be incorporated into an underwater item of equipment or weapon for use as a self-destruct system.

Claims

1. Disposal apparatus for use underwater, the apparatus comprising an enclosure which is sealed for excluding water therefrom and which contains explosive material and a disrupter member having one side adjacent to the explosive material and the other side facing but spaced from a disruptable wall portion of the enclosure for detonation of the explosive material to propel the disrupter member to and through the said wall portion and then impacting upon an item for disposal, near which item the apparatus is positioned when ready for use.
2. Apparatus according to claim 1, wherein the enclosure is elongate.
3. Apparatus according to claim 1 or 2, wherein the said wall portion is made of relatively thin material to ease emergence therethrough of the disrupter member.
4. Apparatus according to claim 1,2 or 3, wherein said disrupter member comprises sheet material and is positioned closely adjacent the explosive material, the member having a cup-shaped cross-sectional profile and protruding into a correspondingly shaped adjacent surface of the explosive material.
5. Apparatus according to any preceding claim, wherein the enclosure comprises a first hollow member filled with said explosive material and having one wall formed by said disrupter member, and a second hollow member having one wall formed by said disruptable wall portion and being connected to the first hollow member so that the disrupter member is exposed to the interior of the second hollow member and faces but is spaced from said disruptable wall portion.
6. Apparatus according to any preceding claim, wherein the enclosure is an elongate cylinder, the disrupter member is a copper disk and the disruptable wall portion is a relatively thin plate covering an end of the cylinder.
7. Disposal apparatus for use underwater substantially as hereinbefore described with reference to the accompanying drawings.
8. Apparatus for underwater operation of a ballistic disc ordnance disposal device, the apparatus comprising an elongated hollow member, a disruptable cover at one end of the hollow member, and attachment means for connecting the other end of the hollow member to a ballistic disc ordnance disposal device for the ballistic disc of the device to be exposed to the interior of the hollow member and to face but remain spaced from said one end thereof, and for the said interior of the hollow member to be sealed to exclude water therefrom.
PCT/GB1994/001620 1993-07-29 1994-07-29 Shaped charge for the destruction of ammunition underwater WO1995004252A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94921739A EP0689662A1 (en) 1993-07-29 1994-07-29 Shaped charge for the destruction of ammunition underwater
NO951298A NO951298L (en) 1993-07-29 1995-04-04 removing apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939315668A GB9315668D0 (en) 1993-07-29 1993-07-29 Disposal apparatus
GB9315668.5 1993-07-29

Publications (1)

Publication Number Publication Date
WO1995004252A1 true WO1995004252A1 (en) 1995-02-09

Family

ID=10739608

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001620 WO1995004252A1 (en) 1993-07-29 1994-07-29 Shaped charge for the destruction of ammunition underwater

Country Status (4)

Country Link
EP (1) EP0689662A1 (en)
GB (1) GB9315668D0 (en)
NO (1) NO951298L (en)
WO (1) WO1995004252A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014048859A1 (en) * 2012-09-26 2014-04-03 Alford Research Limited A charge for underwater use

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117518A (en) * 1947-04-15 1964-01-14 Louis F Porter Apparatus for cutting encased explosives
FR2106860A5 (en) * 1970-09-25 1972-05-05 Europ Propulsion
US3695141A (en) * 1970-11-06 1972-10-03 Us Navy Explosive ordnance demolition weapon
US3759182A (en) * 1967-10-19 1973-09-18 T Suhonen Hollow charge having a directed explosive effect
US4114537A (en) * 1976-10-01 1978-09-19 Andrew James Brown Explosive device
DE3623240C1 (en) * 1986-07-10 1987-10-15 Messerschmitt Boelkow Blohm Shaped charge for disarming ammunition
GB2221285A (en) * 1988-07-27 1990-01-31 Alford Sidney C Linear cutting charge and kit-of-parts for making same
GB2234203A (en) * 1986-07-03 1991-01-30 British Aerospace Explosive devices

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117518A (en) * 1947-04-15 1964-01-14 Louis F Porter Apparatus for cutting encased explosives
US3759182A (en) * 1967-10-19 1973-09-18 T Suhonen Hollow charge having a directed explosive effect
FR2106860A5 (en) * 1970-09-25 1972-05-05 Europ Propulsion
US3695141A (en) * 1970-11-06 1972-10-03 Us Navy Explosive ordnance demolition weapon
US4114537A (en) * 1976-10-01 1978-09-19 Andrew James Brown Explosive device
GB2234203A (en) * 1986-07-03 1991-01-30 British Aerospace Explosive devices
DE3623240C1 (en) * 1986-07-10 1987-10-15 Messerschmitt Boelkow Blohm Shaped charge for disarming ammunition
GB2221285A (en) * 1988-07-27 1990-01-31 Alford Sidney C Linear cutting charge and kit-of-parts for making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014048859A1 (en) * 2012-09-26 2014-04-03 Alford Research Limited A charge for underwater use

Also Published As

Publication number Publication date
GB9315668D0 (en) 1994-01-26
NO951298L (en) 1995-05-22
NO951298D0 (en) 1995-04-04
EP0689662A1 (en) 1996-01-03

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