US2605704A - Pyrotechnical cutting apparatus - Google Patents

Pyrotechnical cutting apparatus Download PDF

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Publication number
US2605704A
US2605704A US706639A US70663946A US2605704A US 2605704 A US2605704 A US 2605704A US 706639 A US706639 A US 706639A US 70663946 A US70663946 A US 70663946A US 2605704 A US2605704 A US 2605704A
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US
United States
Prior art keywords
explosive
cavity
charge
cutting apparatus
section
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Expired - Lifetime
Application number
US706639A
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English (en)
Inventor
Dumas Jacques
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.)
D ENTPR ET DE MECANIQUE SOC IN
INDUSTRIELLE D'ENTREPRISE ET DE MECANIQUE Ste
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D ENTPR ET DE MECANIQUE SOC IN
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Application filed by D ENTPR ET DE MECANIQUE SOC IN filed Critical D ENTPR ET DE MECANIQUE SOC IN
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Publication of US2605704A publication Critical patent/US2605704A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges

Definitions

  • the present invention has for its object a pyrotechnical apparatus specially adapted for pyrotechnical cutting-as. it is practiced in the enterprises of civil engineering and public works, by the apposition of a longitudinal set of explosives to the surface or wall to be out.
  • Its particular object is to provide structures of cutting apparatus which will ensure an efficient cutting, superior to that of the usual practice, while at thesame time only employing a much smaller quantity of explosive.
  • Devices according to the invention comprise an elongated cavity, provided in the explosive, according to a course orientated in the direction of propagation of the detonation wave within the explosive or in a neighboring direction, and opening on the side of the wall to be cut.
  • the cutting effect is, besides, reinforced by the lining of said cavity with a wall made of metal or of a cast or agglomerate material, of a strong mechanical resistance, applied either directly on the surface of the explosive, or on an intermediate envelope containing said explosive.
  • the cross section of said cavity substantially symmetrical with reference to a plane perpendicular to the plane of the surface to be cut, in other words, to the plane defined by its opening along the longitudinal section of the useful charge of the explosive (the section below which the concentration action of the detonation is no longer directed towards the surface to be out), can be either of any triangular, polygonal, or ourvilinear shape desired, but, in accordance with another feature.
  • this cross-section when working with explosives having a high speed of detonation, this cross-section is so designed that the isosceles triangle inscribed, having for its apex the point of the normal maximum distance to the aforesaid plane of opening and for its base, the distance between the extreme points of application of the useful explosive charge in this section shows an angle at the apex Of between 90 and 120.
  • the outer casing of the device if rigid, or the lining of the cavity, is lengthened by construction in the direction of the surface to be cut, in such a manner as to ensure, when the apparatus is put into place, a distance to said surface corresponding to the optimum efiiciency of the cutting charge employed; said distance being always less than about one and a half times the opening of the cavity.
  • the structures of. the apparatus are made flexible or plastic longitudinally, while, at the same time, retaining practically the above men-.
  • Fig. 1 shows, in perspective, a diagrammatical example of embodiment of such an apparatus
  • Figs. 2 and 3 and Fig. 5 givein cross-section, two alternatives of the example shown in Fig. 1.
  • Fig. 4 shows the limit of dimensioning provided for the cross-section of the cavity; and 7 Figs. 6 to 9 represent various alternatives of embodiment, incorporating some structural features specially designed to give a simple method of putting the invention into execution.
  • This casing is lengthened by walls such as 5 and 6 which permit of obtaining by construction the optimum distance of action between the useful plane of the explosive charge and the planeof the surface to be out which distance is variable following the shape and nature of the charge I and the material of the surface to be cut, but which is less than one and a half times the transversalwidth of the cavity formed by said walls.
  • walls such as 5 and 6 which permit of obtaining by construction the optimum distance of action between the useful plane of the explosive charge and the planeof the surface to be out which distance is variable following the shape and nature of the charge I and the material of the surface to be cut, but which is less than one and a half times the transversalwidth of the cavity formed by said walls.
  • this distance can be defined'during the manufacturing process, not being calculated from the rigid lining of the cavity 3, but from the rigid casing surrounding the explosive charge.
  • this crosssection is shown as an isosceles triangle with its apex upper A and laterals B and C. This triangular section .is not necessary, however, and
  • linesAB and BC of the casing may be curved as shown, for'example an ogivel of apex A or even a semi-circular arch as is shown as an illustration in 8 of Fig. 3, where the section is a semi-circle with the diameter BC.
  • the crosssection of the cavity which should preferably be symmetrical with respect to th longitudinal plane of the apparatus, should have such aform that the above-mentioned isosceles triangle with its points AB and C defined above,
  • the walls of this cavity can then have any desired form, from the dihedral shape BAC to the cylindrical shape B1AC1, passing through any other curvilinear and (or) polygonal shape.
  • tubes it is understood not only circular tubes but thoseof all forms of circular, elliptical, oval, or polygonal sections as desired. It is thus that in the, example shown in Fig. 6 the explosive I oocupies the space between an oval tube II which forms at the same time the outer casing and a tube of circular section I 2 which forms the wall of the cavity 3.
  • the outside tube I3 is flattened at I4 in order to constitute a supporting wall on the surface to be cut, the cavity 3 being limited by a profiled element I5 having a V-shaped cross section.
  • This element I5 is wedged in the tube I3 by the compressed powder behind it.
  • the external casing I6 is made of a flexible sheath which is fixed around the tube I'I, limiting the cavity 3 and the explosive I, and holding them in their relative desirable positions. Structures of this type are specially interesting, from the sole point of view of efficiency, for the underwater employment of the cutting apparatus; in fact, it has been discovered that in the latter case it was necessary to keep the cavity 3 watertight, which was rendered easy to realize, owing to these shapes.
  • this method of realization permits the simplification of putting into practice another feature of the invention, that of making flexible the cutting apparatus comprising a cavity in order to facilitate putting them into position and to increase their efliciency on curved or irregular surfaces. It is suflicient, in fact, to provide for flexible tubes, water-tight or not, and other flexible elements of any known convenient type, and to employ either a pulverulent or a plastic explosive, while keeping, at the same time, the degree of rigidity desirable for the wall of the cavity 3, and the extensions of this wall,-or of the casing, used to keep the required spacing between the cutting apparatus and the surface to be cut, for example, by making them of a plastic, moulded, 0r agglomerated material reinforced or not by a casing or by a metallic framework.
  • the charge I will be plastic, whereas the lining 4 and the walls 5, 6 thereof will be flexible.
  • the charge I may be pulverulent or plastic, the tubes II and I2 being flexible.
  • Fig. 9 shows diagrammatically, such an arrangement in which the rigid elements IB, I9, 20 of a cross-section such as is shown in relation to Figs. 1 to 8, or derived from these examples, are provided with terminal faces 2i and 22, convex and concave respectively, which fitinto each other.
  • the continuity of the whole is ensured for example, by a flexible sheath 23, or it can simply be realized by placing some elements, one after the other onto the cutting wall.
  • an elongated explosive charge formed of a plurality of comparatively rigid units and a relatively flexible sheath encasing all said units, the contacting adjacent ends of said units being formed respectively concavely and convexly and having substantially identical radii, whereby flexing of said sheath will maintain a substantially unaltered area of contact between adjacent ones of said units, said charge being formed with a longitudinal groove along the entire length thereof, so as to concentrate the cutting effect of the charge when exploded.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
US706639A 1945-11-07 1946-10-30 Pyrotechnical cutting apparatus Expired - Lifetime US2605704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR921208T 1945-11-07

Publications (1)

Publication Number Publication Date
US2605704A true US2605704A (en) 1952-08-05

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Family Applications (1)

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US706639A Expired - Lifetime US2605704A (en) 1945-11-07 1946-10-30 Pyrotechnical cutting apparatus

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US (1) US2605704A (en))
BE (1) BE468966A (en))
FR (1) FR921208A (en))
GB (1) GB618617A (en))
NL (1) NL66224C (en))

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763210A (en) * 1953-01-06 1956-09-18 Joseph H Church Shaped charges
US2833215A (en) * 1951-08-18 1958-05-06 Thomas C Bannon Gun perforator and method of manufacture
US3185089A (en) * 1962-06-28 1965-05-25 Thiokol Chemical Corp Flexible linear shaped charge for underwater use
US3280743A (en) * 1963-05-10 1966-10-25 Hubert G Reuther Directional control of explosive energy
US3561703A (en) * 1969-07-07 1971-02-09 Stencel Aero Eng Corp Canopy breaking by shaped charge
JPS4894981A (en)) * 1972-03-17 1973-12-06
US3934511A (en) * 1968-08-15 1976-01-27 The United States Of America As Represented By The Secretary Of The Navy Linear shaped charge warhead
US3991679A (en) * 1975-06-23 1976-11-16 The United States Of America As Represented By The Secretary Of The Navy Booster apparatus for augmenting side initiation of explosive cords
US4034672A (en) * 1976-01-02 1977-07-12 Eckels Robert E Linear explosive
FR2473402A1 (en) * 1980-01-15 1981-07-17 Alsetex Armement Etud Pyrotechnical process for splitting concrete slab - uses chain of explosive charges with inverted V=section at definite centres along cut line
US4297946A (en) * 1978-12-05 1981-11-03 Paton Boris E Extended shaped charge and method of making same
US4374495A (en) * 1977-09-17 1983-02-22 Thomanek Franz R Warhead for antitank missiles featuring a shaped charge
US4649825A (en) * 1984-06-25 1987-03-17 The United States Of America As Represented By The Secretary Of The Navy Explosive separation system for composite materials
EP0278233A1 (de) * 1987-01-14 1988-08-17 DIEHL GMBH & CO. Gehäuse für koppelbare Schneidladungen
AU600236B2 (en) * 1979-08-14 1990-08-09 Bae Systems Plc Linear cutting charge
US5111637A (en) * 1988-09-26 1992-05-12 Highland Supply Corporation Method for wrapping a floral grouping
US5239804A (en) * 1988-09-26 1993-08-31 Highland Supply Corporation Method for wrapping a floral grouping
US5522319A (en) * 1994-07-05 1996-06-04 The United States Of America As Represented By The United States Department Of Energy Free form hemispherical shaped charge
US5720344A (en) * 1996-10-21 1998-02-24 Newman; Frederic M. Method of longitudinally splitting a pipe coupling within a wellbore
US20050211467A1 (en) * 2004-03-24 2005-09-29 Schlumberger Technology Corporation Shaped Charge Loading Tube for Perforating Gun
US20060201373A1 (en) * 2002-11-28 2006-09-14 James Sammons Linear shaped charge system
AU2003283125B2 (en) * 2002-11-28 2009-04-23 Applied Explosives Technology Pty Limited Improved linear shaped charge system
US20100018427A1 (en) * 2006-03-04 2010-01-28 Alford Research Limited Explosive Charge
US8006621B1 (en) * 2008-02-07 2011-08-30 Cherry Christopher R Linear explosive breaching apparatus and method
US8146503B2 (en) 2002-11-28 2012-04-03 Rapid Entry Pty Limited Linear shaped charge system
CN104101273A (zh) * 2014-07-21 2014-10-15 中国船舶重工集团公司第七○二研究所 一种基于水下爆炸技术的新型排爆装置
US8887609B1 (en) 2009-02-27 2014-11-18 Christopher R. Cherry Explosive system for destruction of overpacked munitions
RU2570148C1 (ru) * 2014-07-01 2015-12-10 Общество с ограниченной ответственностью "Газпром трансгаз Самара" Подрывной заряд
AU2016225950B2 (en) * 2016-09-12 2018-09-27 Applied Explosives Technology Pty Limited Further Improved Linear Shaped Charge System
US10969204B2 (en) * 2018-01-11 2021-04-06 The United States Of America, As Represented By The Secretary Of The Navy Systems and methods for penetrating structures with repositionable shaped charges
RU204402U1 (ru) * 2020-05-19 2021-05-24 Николай Павлович Михайлов Удлиненный заряд взрывчатого вещества

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513233A (en) * 1949-03-15 1950-06-27 Laud Stanley Byers Multiple jet blasting charge
US2973164A (en) * 1949-05-13 1961-02-28 Northrop Corp Wing severing device
US2789504A (en) * 1950-02-25 1957-04-23 Mccloud Mary High explosives
US2757611A (en) * 1950-04-11 1956-08-07 Joseph H Church Shaped charges
US2839997A (en) * 1950-05-12 1958-06-24 Joseph H Church Shaped charges
DE974557C (de) * 1956-07-27 1961-02-09 Wasagchemie Ag Verfahren zur Lenkung und Verstaerkung der Wirkung von Sprengkoerpern
GB2476992B (en) 2010-01-18 2014-12-03 Jet Physics Ltd Linear shaped charge
GB2476993B (en) 2010-01-18 2015-02-11 Jet Physics Ltd A material and linear shaped charge

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191128030A (en) * 1910-12-14 1912-10-10 Westf Anhaltische Sprengstoff Improvement in Explosive Charges or Bodies.
US1440601A (en) * 1921-01-06 1923-01-02 John R Holran Explosive charge
US1531555A (en) * 1924-07-31 1925-03-31 Joseph W Harris Art of perforating and severing metals
US2404440A (en) * 1941-04-19 1946-07-23 Clarence W Lothrop Torpedo countermining device
US2407093A (en) * 1942-05-21 1946-09-03 Gestion Et D Expl De Brevets S Method and apparatus for cutting or punching sheet material
US2409848A (en) * 1943-03-10 1946-10-22 Carnegie Illinois Steel Corp Twin tube mine clearing snake
US2543057A (en) * 1946-04-30 1951-02-27 Louis F Porter Elongated flexible tubular explosive

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191128030A (en) * 1910-12-14 1912-10-10 Westf Anhaltische Sprengstoff Improvement in Explosive Charges or Bodies.
US1440601A (en) * 1921-01-06 1923-01-02 John R Holran Explosive charge
US1531555A (en) * 1924-07-31 1925-03-31 Joseph W Harris Art of perforating and severing metals
US2404440A (en) * 1941-04-19 1946-07-23 Clarence W Lothrop Torpedo countermining device
US2407093A (en) * 1942-05-21 1946-09-03 Gestion Et D Expl De Brevets S Method and apparatus for cutting or punching sheet material
US2409848A (en) * 1943-03-10 1946-10-22 Carnegie Illinois Steel Corp Twin tube mine clearing snake
US2543057A (en) * 1946-04-30 1951-02-27 Louis F Porter Elongated flexible tubular explosive

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833215A (en) * 1951-08-18 1958-05-06 Thomas C Bannon Gun perforator and method of manufacture
US2763210A (en) * 1953-01-06 1956-09-18 Joseph H Church Shaped charges
US3185089A (en) * 1962-06-28 1965-05-25 Thiokol Chemical Corp Flexible linear shaped charge for underwater use
US3280743A (en) * 1963-05-10 1966-10-25 Hubert G Reuther Directional control of explosive energy
US3934511A (en) * 1968-08-15 1976-01-27 The United States Of America As Represented By The Secretary Of The Navy Linear shaped charge warhead
US3561703A (en) * 1969-07-07 1971-02-09 Stencel Aero Eng Corp Canopy breaking by shaped charge
JPS4894981A (en)) * 1972-03-17 1973-12-06
US3991679A (en) * 1975-06-23 1976-11-16 The United States Of America As Represented By The Secretary Of The Navy Booster apparatus for augmenting side initiation of explosive cords
US4034672A (en) * 1976-01-02 1977-07-12 Eckels Robert E Linear explosive
US4374495A (en) * 1977-09-17 1983-02-22 Thomanek Franz R Warhead for antitank missiles featuring a shaped charge
US4297946A (en) * 1978-12-05 1981-11-03 Paton Boris E Extended shaped charge and method of making same
AU600236B2 (en) * 1979-08-14 1990-08-09 Bae Systems Plc Linear cutting charge
FR2473402A1 (en) * 1980-01-15 1981-07-17 Alsetex Armement Etud Pyrotechnical process for splitting concrete slab - uses chain of explosive charges with inverted V=section at definite centres along cut line
US4649825A (en) * 1984-06-25 1987-03-17 The United States Of America As Represented By The Secretary Of The Navy Explosive separation system for composite materials
EP0278233A1 (de) * 1987-01-14 1988-08-17 DIEHL GMBH & CO. Gehäuse für koppelbare Schneidladungen
US5111637A (en) * 1988-09-26 1992-05-12 Highland Supply Corporation Method for wrapping a floral grouping
US5239804A (en) * 1988-09-26 1993-08-31 Highland Supply Corporation Method for wrapping a floral grouping
US5522319A (en) * 1994-07-05 1996-06-04 The United States Of America As Represented By The United States Department Of Energy Free form hemispherical shaped charge
US5720344A (en) * 1996-10-21 1998-02-24 Newman; Frederic M. Method of longitudinally splitting a pipe coupling within a wellbore
US20060201373A1 (en) * 2002-11-28 2006-09-14 James Sammons Linear shaped charge system
AU2003283125B2 (en) * 2002-11-28 2009-04-23 Applied Explosives Technology Pty Limited Improved linear shaped charge system
US7536956B2 (en) * 2002-11-28 2009-05-26 Rapid Entry Pty Limited Linear shaped charge system
US8146503B2 (en) 2002-11-28 2012-04-03 Rapid Entry Pty Limited Linear shaped charge system
US7159657B2 (en) 2004-03-24 2007-01-09 Schlumberger Technology Corporation Shaped charge loading tube for perforating gun
US20050211467A1 (en) * 2004-03-24 2005-09-29 Schlumberger Technology Corporation Shaped Charge Loading Tube for Perforating Gun
US9746292B2 (en) 2006-03-04 2017-08-29 Alford Research Limited Explosive charge
US20100018427A1 (en) * 2006-03-04 2010-01-28 Alford Research Limited Explosive Charge
US8006621B1 (en) * 2008-02-07 2011-08-30 Cherry Christopher R Linear explosive breaching apparatus and method
US8887609B1 (en) 2009-02-27 2014-11-18 Christopher R. Cherry Explosive system for destruction of overpacked munitions
RU2570148C1 (ru) * 2014-07-01 2015-12-10 Общество с ограниченной ответственностью "Газпром трансгаз Самара" Подрывной заряд
CN104101273A (zh) * 2014-07-21 2014-10-15 中国船舶重工集团公司第七○二研究所 一种基于水下爆炸技术的新型排爆装置
AU2016225950B2 (en) * 2016-09-12 2018-09-27 Applied Explosives Technology Pty Limited Further Improved Linear Shaped Charge System
US10900756B2 (en) 2016-09-12 2021-01-26 Applied Explosives Technology Pty Limited Further improved flexible linear charge system
AU2018282259B2 (en) * 2016-09-12 2021-07-01 Applied Explosives Technology Pty Limited Further Improved Flexible Linear Charge System
US10969204B2 (en) * 2018-01-11 2021-04-06 The United States Of America, As Represented By The Secretary Of The Navy Systems and methods for penetrating structures with repositionable shaped charges
RU204402U1 (ru) * 2020-05-19 2021-05-24 Николай Павлович Михайлов Удлиненный заряд взрывчатого вещества

Also Published As

Publication number Publication date
GB618617A (en) 1949-02-24
NL66224C (en))
FR921208A (fr) 1947-04-30
BE468966A (en))

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