US3855929A - Linear shaped charge device - Google Patents

Linear shaped charge device Download PDF

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Publication number
US3855929A
US3855929A US00224206A US22420672A US3855929A US 3855929 A US3855929 A US 3855929A US 00224206 A US00224206 A US 00224206A US 22420672 A US22420672 A US 22420672A US 3855929 A US3855929 A US 3855929A
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United States
Prior art keywords
explosive
chamber
linear shaped
chevron
stand
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 - Lifetime
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US00224206A
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English (en)
Inventor
J Ridgeway
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EXPLO RIDGEWAY INT Ltd
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EXPLO RIDGEWAY INT Ltd
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Priority to GB5082172A priority Critical patent/GB1367011A/en
Application granted granted Critical
Publication of US3855929A publication Critical patent/US3855929A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S102/00—Ammunition and explosives
    • Y10S102/705—Separated explosive constituents

Definitions

  • ABSTRACT An improved linear shaped charge device, particularly for underwater use, wherein there is structurally included an integral air tight standoff to precisely separate the chevron shaped explosive chamber from the work piece and having optimum, critical dimensions for the angle of the chevron, liner thickness and standoff distance.
  • the whole linear shaped charged device is integrally extruded of aluminum and uses a non-detonatable, multi-component explosive for safety. Besides being purely linear,the device has an outer circular cutter configuration (FIG. 2) and an inner circular cutter configuration (FIGS. 3 and 4).
  • Linear shaped charges generally are well known in the prior art and have become generally acceptable for cutting jobs in specialized circumstances.
  • the linear shaped charges of the prior art have had various drawbacks and disadvantages, and the present invention has been designed to overcome these prior art problems.
  • the present invention includes an air tight standoff chamber integral with the explosive chamber, providing precise minimum spacing between the explosive chamber and the work piece and an initial gas/air medium during the critical time when the explosive shock wave is being formed and initially propagated.
  • the cutting effectiveness of the present invention over the prior art has been maximized by the discovery and adoption of various critical dimensions, particularly as to the liner thickness, the liner angle and the standoff distance.
  • the present invention provides an improvement to conventional linear shaped charge devices which will safely eliminate the present handicap associated with legally transporting, handling and storing of explosive linear shaped charge devices.
  • the explosivechamber of the present invention is formed into a chevron or double V and a second adjacent air tight chamber is formed as an integral standoff for this device to function as intended.
  • the shock wave causes the sides of the interior V to collapse and impinge with a resultant shock wave down the axis of the chevron, bisecting the standoff air chamber and thereby producing a highly magnified shock wave with a gas expansion and high temperature eroding jet sufficient to cut practically any nearby metal.
  • the liquid explosive is composed of non-detonatable, multi-component chemicals, which if individually packaged, are classified as passenger air-transportable by the International Air Transport Association.
  • the cost-optimum material for a multi-component explosive was found to be a one piece extrusion of 6061 aluminum and the critical ideal dimensions of the present invention are a liner thickness of 0.18 inch, liner angle of minimum standoff of 2.0 inches and a chevron configuration as shown in FIG. 1.
  • This design is not only unique in its one piece extrusion for a hermetrically sealed underwater linear shaped charge, but in its ability to penetrate steel deeper than existing linear shaped charges using the same grain per foot loading with the same liner material.
  • the method of initiation for this improved device can be for example by a class C explosive cordeau detonate fuse knotted.
  • the knot acts as a booster sufficient to reliably boost multi-component explosives to high detonation velocity.
  • the safety aspects are notably different in that a class A pressure sensitive blasting cap or detonator is never required to go into the water with the diver.
  • FIG. 1 is a transverse, cross-sectional view of the improved linear shaped charge device with built-in standoff of the present invention, the cross-section being taken along section lines 1-] of FIG. 2.
  • FIG. 2 is a plan view of the improved linear shaped charge in the configuration of an outside circular cutter with the work piece shown in phantom lines.
  • FIG. 3 is a plan view of the improved linear shaped charge as an inside circular cutter.
  • FIG. 4 is a cross-sectional view, along sections lines IV-IV of FIG. 3, showing the innertube inflated spacer inside of a pipe to be cut.
  • the basic transverse, side configuration of the linear shape charge 1 of the present invention is shown .in FIG. 1.
  • the one piece device which can be extruded from aluminum, includes a hollow chevron-shaped explosive chamber 6 formed between two parallel V- shaped walls -a top exterior wall 3 and an interior liner wall 5.
  • the liner angle is indicated in FIG. 1 by the symbol alpha.
  • Integrally formed with the explosive chamber 6 is an adjacent air tight standoff chamber formed between the two flat, parallel side walls 2, 2, the bottom exterior wall 4 and the liner wall 5. Both the explosive chamber 6 and the stand-off chamber are leaktight to keep all exterior water out.
  • the bottom exterior wall 4 could likewise be V-shaped (as indicated in phantom lines) similar but opposite to exterior wall
  • certain dimensions of the device are critical. It has been found that in the present invention the optimum liner thickness is 0.18 inch i 10 percent and the liner angle alpha is 85 i 3. Also particumum stand-off distance allows the explosive cutting jet to be fully formed before encountering the exterior water or other ambient.
  • the linear shaped charge device of the present invention can be formed by bending into any desired configuration, such as circular to serve as either an outside circular cutter (FIG. 2) or an inside circular cutter (FIGS. 3 and 4).
  • hermetically sealed half-sections of an outside circular cutter utilizing the linear shape charge device of the present invention are represented by elements '10 and For placement about a workpiece such as a pipe, the two half-sections 10, 10 rotate about the hinge ll. Latching hooks 12, 12' for closing the device about a pipe and fill port and detonation wells 25, 25' are provided on the cutter half-sections.
  • FIG. 3 an hermetically sealed inside circular cutter utilizing the linear shape charge device of the present invention is illustrated.
  • the improved linear shaped charge extrusion of the present invention is represented by element 20, and includes a spider assembly 23 which acts as a stablizing guide and leveler for the cutter.
  • FIG. 4 is a transverse, cross-sectional view of the device of FIG. 3.
  • the linear shape charge device of thepresent invention is defined by the extrusion walls 21, 22 and includes on its bottom exterior wall an inflated innertube 24 used to displace the water between the linear shaped charge extrusion and the pipe to be cut.
  • a non-detonatable multicomponent explosive is used with the improved linear shape charge device of the present invention and is placed in the hollow explosive chamber 6 by means of suitable fill ports such as elements 25, 25' and 26, 26' of FIGS. 2 and 3, respectively.
  • An exampleof such an explosive is that marketed under the trade name Astro-Pak by the Explosives Corporation of America of Issaquah, Washington.
  • Astro-Pak is a two component (binary) liquid explosive system. Each component is separately non-detonatable and classified as a nonexplosive by the Department of Transportation prior to mixing.
  • Astro-Pak may be transported and stored in conventional vehicles or facilities under lock and key. Magazines, ready boxes, or other special equipment or facilities, are not required for unmixed Astro-pak.
  • Astro-Pak is mixed to form Astrolite T, a versatile, high performance liquid explosive. The mixed Astrolite is a Class A high explosive and must be handled, transported, stored, and used with the care accorded such explosives.
  • An improved linear shaped charge device comprising a hollow. chevron-shaped explosive chamber and integrally formed therewith an air tight, hollow standoff chamber located adjacent to and below said chevronshaped explosive chamber, the bottom, interior wall of said explosive chamber being an explosive liner wall, and both hollow chambers being constructed from extrudable metal as a one-piece extrusion.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US00224206A 1971-11-25 1972-02-07 Linear shaped charge device Expired - Lifetime US3855929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5082172A GB1367011A (en) 1971-11-25 1972-11-03 Linear shaped-charge device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7142206A FR2161440A5 (enrdf_load_stackoverflow) 1971-11-25 1971-11-25

Publications (1)

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US3855929A true US3855929A (en) 1974-12-24

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US00224206A Expired - Lifetime US3855929A (en) 1971-11-25 1972-02-07 Linear shaped charge device

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US (1) US3855929A (enrdf_load_stackoverflow)
FR (1) FR2161440A5 (enrdf_load_stackoverflow)
IT (1) IT970304B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126092A (en) * 1976-01-27 1978-11-21 Imperial Chemical Industries Limited Method of cutting metal elements underwater and a shaped explosive charge device therefor
US4160413A (en) * 1976-10-20 1979-07-10 Imperial Chemical Industries Limited Shaped explosive charge device for under water use
US20020189482A1 (en) * 2001-05-31 2002-12-19 Philip Kneisl Debris free perforating system
US20050211467A1 (en) * 2004-03-24 2005-09-29 Schlumberger Technology Corporation Shaped Charge Loading Tube for Perforating Gun
US7546806B1 (en) * 2006-03-24 2009-06-16 The United States Of America As Represented By The Secretary Of The Army Selectable output well perforator and method for producing variable hole profiles
US20100043661A1 (en) * 2008-08-25 2010-02-25 Ensign-Bickford Aerospace & Defense Company Explosive cutting charge
US20100139515A1 (en) * 2008-12-09 2010-06-10 Schlumberger Technology Corporation Shaped charge with an integral liner and case
US8887609B1 (en) * 2009-02-27 2014-11-18 Christopher R. Cherry Explosive system for destruction of overpacked munitions
US8904934B1 (en) 2011-01-28 2014-12-09 The United States Of America As Represented By The Secretary Of The Navy Segmented flexible linear shaped charge
US8978558B2 (en) 2010-01-18 2015-03-17 Jet Physics Limited Shaped charge and element
US20150219427A1 (en) * 2014-01-31 2015-08-06 Alford Research Limited Linear shaped charges
US11022410B2 (en) 2010-01-18 2021-06-01 Jet Physics Limited Shaped charge liner method and apparatus
US11879711B1 (en) * 2021-06-30 2024-01-23 The United States Of America As Represented By The Secretary Of The Navy Radial rigid underwater between-structure explosive cutting cavity (RRUBECC) container

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524367B1 (fr) * 1982-04-01 1985-10-11 Commissariat Energie Atomique Dispositif telemanipulaire pour le decoupage de toles et de tubes en atmosphere dangereuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543057A (en) * 1946-04-30 1951-02-27 Louis F Porter Elongated flexible tubular explosive
US2587243A (en) * 1946-10-16 1952-02-26 I J Mccullough Cutting apparatus
US3165057A (en) * 1962-07-02 1965-01-12 Ling Temco Vought Inc Linear shaped charge unit
US3419443A (en) * 1967-04-17 1968-12-31 Explosives Corp America Hydrazine containing explosive compositions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543057A (en) * 1946-04-30 1951-02-27 Louis F Porter Elongated flexible tubular explosive
US2587243A (en) * 1946-10-16 1952-02-26 I J Mccullough Cutting apparatus
US3165057A (en) * 1962-07-02 1965-01-12 Ling Temco Vought Inc Linear shaped charge unit
US3419443A (en) * 1967-04-17 1968-12-31 Explosives Corp America Hydrazine containing explosive compositions

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126092A (en) * 1976-01-27 1978-11-21 Imperial Chemical Industries Limited Method of cutting metal elements underwater and a shaped explosive charge device therefor
US4160413A (en) * 1976-10-20 1979-07-10 Imperial Chemical Industries Limited Shaped explosive charge device for under water use
US20020189482A1 (en) * 2001-05-31 2002-12-19 Philip Kneisl Debris free perforating system
US20050211467A1 (en) * 2004-03-24 2005-09-29 Schlumberger Technology Corporation Shaped Charge Loading Tube for Perforating Gun
US7159657B2 (en) 2004-03-24 2007-01-09 Schlumberger Technology Corporation Shaped charge loading tube for perforating gun
US7546806B1 (en) * 2006-03-24 2009-06-16 The United States Of America As Represented By The Secretary Of The Army Selectable output well perforator and method for producing variable hole profiles
US20100043661A1 (en) * 2008-08-25 2010-02-25 Ensign-Bickford Aerospace & Defense Company Explosive cutting charge
US20100139515A1 (en) * 2008-12-09 2010-06-10 Schlumberger Technology Corporation Shaped charge with an integral liner and case
US8887609B1 (en) * 2009-02-27 2014-11-18 Christopher R. Cherry Explosive system for destruction of overpacked munitions
US8978558B2 (en) 2010-01-18 2015-03-17 Jet Physics Limited Shaped charge and element
US11022410B2 (en) 2010-01-18 2021-06-01 Jet Physics Limited Shaped charge liner method and apparatus
US8904934B1 (en) 2011-01-28 2014-12-09 The United States Of America As Represented By The Secretary Of The Navy Segmented flexible linear shaped charge
US20150219427A1 (en) * 2014-01-31 2015-08-06 Alford Research Limited Linear shaped charges
US9534874B2 (en) * 2014-01-31 2017-01-03 Alford Research Limited Linear shaped charges
US11879711B1 (en) * 2021-06-30 2024-01-23 The United States Of America As Represented By The Secretary Of The Navy Radial rigid underwater between-structure explosive cutting cavity (RRUBECC) container

Also Published As

Publication number Publication date
FR2161440A5 (enrdf_load_stackoverflow) 1973-07-06
IT970304B (it) 1974-04-10

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