US3451339A - Priming explosive devices - Google Patents

Priming explosive devices Download PDF

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Publication number
US3451339A
US3451339A US437633A US3451339DA US3451339A US 3451339 A US3451339 A US 3451339A US 437633 A US437633 A US 437633A US 3451339D A US3451339D A US 3451339DA US 3451339 A US3451339 A US 3451339A
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Prior art keywords
charge
booster
block
explosive
principal
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US437633A
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Michel Precoul
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TECH DE RECH IND ET MECHANIQUE
TECHNIQUE DE RECHERCHES IND ET MECHANIQUES SOC
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TECH DE RECH IND ET MECHANIQUE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/0838—Primers or igniters for the initiation or the explosive charge in a warhead
    • 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
    • F42B1/024—Shaped or hollow charges provided with embedded bodies of inert material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/10—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by combustion
    • F42C9/12—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by combustion with ring combustion elements

Definitions

  • the present invention aims at a special form of priming through toroidal waves for a projectile having a hollow charge.
  • the priming according to the invention is characterized essentially by an annular priming relay or booster preferably frusto-conical in shape placed in a seat made of an inert material, preferably a plastic, presenting notably, a low speed of transmission for shock waves.
  • the annexed drawing shows a view, partly in longitudinal section, of a hollow charge provided with the annular priming here concerned.
  • the charge comprises a casing 1, a facing 2 for the hollow charge and a principal body of explosive or main charge 3.
  • the rear closure for the charge is provided by a base 4 which carries a fuse 5.
  • the fuse primer or detonator 6, constitutes the initiator of the pyrotechnic chain of the priming according to the invention.
  • the annular priming or booster relay 7 preferably of frusto-conical shape, is positioned in a ring 8, of an inert material, having a cavity with a shape corresponding to the shape of the external surface of the booster 7.
  • annular booster forms a complete block, substantially cylindrical in shape, positioned behind the principal explosive 3 of the hollow charge, with internal and external protection provided for the annular booster 7, itself, by the elements of inert material 8 and 9.
  • the pyrotechnic linkage between the primer of the fuse 5 and the annular block of priming or booster 7 according to the invention is provided by an intermediate relay element having in general a very flat shape, its diameter d being relatively very great in comparison to its thickness R.
  • the diameter d of the intermediate relay element 10 is equal to or a little larger at most, than the small rear diameter a" of the annular frusto-conical booster block 7, according to the invention.
  • the large diameter D of the annular frustro-conical booster block 7 is relatively great and very near the diameter D of the principal explosive charge 3.
  • the annular priming or booster block 7 preferably frusto-conical, assures the emission of toroidal waves of diameter T through the assembly just as f, f and j" which are propagated more rapidly through the intermediate relay element 10 and the annular frusto-conical booster block 7 than the axially directed waves g-g' retarded by their passage through the inert material of the axial wadge 9.
  • the principal explosive charge 3 is terminated at its rear by a plane surface P, perpendicular to the longitudinal axis X-X' of the projectile, a plane which abuts and blends into the front surface of the annular frusto-conical block 7 according to the invention.
  • the rear plane P of the annular frusto-conical booster block 7 is identical with the front face, likewise planar, of the intermediate relay element 10 (the relay being carried in a casing 10').
  • the rear face P also planar, of the intermediate relay element 10 is substantially merged with or is very close to the front face of the primary primer 6 of the fuse 5.
  • the system according to the invention is characterized by a great simplicity in the organization of the pyrotechnic chain, constituted by the juxtaposition and coincidence of the planar surfaces perpendicular to the axis of the projectile, of the various elements making up said chain: the primary fuse primer, the intermediate relay element, the annular relay element or booster and the principal explosive charge.
  • the construction of the projectile may be in two sections.
  • One section may comprise the body of the projectile 1 and the main or principal explosive charge 3 and the other section the rear base 4 containing the intermediate relay element 10, as well as the annular priming element or booster 7, wedged, protected and mounted by its system of elements of inert material 8 and 9.
  • the simple assembly, according to the invention, of the two sections completes a pyrotechnic chain having an annular primer or booster according to the invention which initiates the toroidal waves sought for.
  • the annular booster may be made of tetryl, the inert material may 'be made of Rilsan or an elastomer, and the principal explosive charge may 'be made of a mixture (6040) of hexogene (RDX) and ltolite (TNT).
  • RDX hexogene
  • TNT ltolite
  • the intermediate element 10 may be powder.
  • the fuse primer 63 may be made of any of the various constructions and compositions well known to the art.
  • An explosive device having a casing, a principal explosive charge in said casing, said principal charge having a cavity with a lining to confer a hollow charge effect, fuse means, and a booster assembly positioned rearwardly of said principal charge, said assembly comprising a substantially cylindrical block of explosively inert material having a frusto-conic-al cavity, a conical plug of explosively inert material positioned in said frusto-conical cavity and smaller than said cavity, said plug and said block defining an annular chamber of frusto-conical shape having its larger end adjacent the principal charge, and a block of booster explosive in said chamber, the larger surface of said booster explosive block being in direct physical contact with the principal charge and the lesser surface being pyrotechnically connected with said fuse means.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

M. PRECOUL June 24, 1969 PRIMING EXPLOSIVE DEVICES Filed March 2, 1965 1NVENTOR. M1 'cvfe/ Precau/ 3,451,339 PRIMING EXPLOSIVE DEVICES Michel Precoul, Paris, France, assignor to Societe Technique de Recherches Industrielles et Mechaniques, Paris, France, a French company Filed Mar. 2, 1965, Ser. No. 437,633 Claims priority, application France, Mar. 3, 1964,
Int. Cl. B421) 1/04, 1/02 US. Cl. 102-56 6 Claims Primings of projectiles by toroidal shock waves and in particular primings of hollow charges are known in themselves and they have been made the object of many forms of specific embodiment.
The present invention aims at a special form of priming through toroidal waves for a projectile having a hollow charge.
The description below concerns one such type of priming according to the invention. It is emphasized, however, that it is given merely as an example and is not intended as a limitation and that many other modes of construction, shapes, proportions, arrangements, etc. may equally well be used without departing from the framework of the invention.
The priming according to the invention is characterized essentially by an annular priming relay or booster preferably frusto-conical in shape placed in a seat made of an inert material, preferably a plastic, presenting notably, a low speed of transmission for shock waves.
The annexed drawing shows a view, partly in longitudinal section, of a hollow charge provided with the annular priming here concerned.
The charge comprises a casing 1, a facing 2 for the hollow charge and a principal body of explosive or main charge 3.
The rear closure for the charge is provided by a base 4 which carries a fuse 5. The fuse primer or detonator 6, constitutes the initiator of the pyrotechnic chain of the priming according to the invention.
In accordance with the invention, the annular priming or booster relay 7, preferably of frusto-conical shape, is positioned in a ring 8, of an inert material, having a cavity with a shape corresponding to the shape of the external surface of the booster 7.
An axial wedge 9 of an inert material, preferably conical in shape, fills, according to the invention, the interior space of the annular booster 7.
Thus the annular booster according to the invention, forms a complete block, substantially cylindrical in shape, positioned behind the principal explosive 3 of the hollow charge, with internal and external protection provided for the annular booster 7, itself, by the elements of inert material 8 and 9.
The pyrotechnic linkage between the primer of the fuse 5 and the annular block of priming or booster 7 according to the invention is provided by an intermediate relay element having in general a very flat shape, its diameter d being relatively very great in comparison to its thickness R.
The diameter d of the intermediate relay element 10 is equal to or a little larger at most, than the small rear diameter a" of the annular frusto-conical booster block 7, according to the invention.
Thus, these arrangements permit the continuous transmission of the detonation from the primer 6 to the booster block 7.
In accordance with the invention the large diameter D of the annular frustro-conical booster block 7 is relatively great and very near the diameter D of the principal explosive charge 3.
Thus in the system according to the invention the annular priming or booster block 7, preferably frusto-conical, assures the emission of toroidal waves of diameter T through the assembly just as f, f and j" which are propagated more rapidly through the intermediate relay element 10 and the annular frusto-conical booster block 7 than the axially directed waves g-g' retarded by their passage through the inert material of the axial wadge 9.
Conforming to the invention, the principal explosive charge 3 is terminated at its rear by a plane surface P, perpendicular to the longitudinal axis X-X' of the projectile, a plane which abuts and blends into the front surface of the annular frusto-conical block 7 according to the invention.
Similarly, the rear plane P of the annular frusto-conical booster block 7 according to the invention, is identical with the front face, likewise planar, of the intermediate relay element 10 (the relay being carried in a casing 10').
Finally, the rear face P", also planar, of the intermediate relay element 10, is substantially merged with or is very close to the front face of the primary primer 6 of the fuse 5.
Thus the system according to the invention, is characterized by a great simplicity in the organization of the pyrotechnic chain, constituted by the juxtaposition and coincidence of the planar surfaces perpendicular to the axis of the projectile, of the various elements making up said chain: the primary fuse primer, the intermediate relay element, the annular relay element or booster and the principal explosive charge.
Finally, the construction of the projectile may be in two sections. One section may comprise the body of the projectile 1 and the main or principal explosive charge 3 and the other section the rear base 4 containing the intermediate relay element 10, as well as the annular priming element or booster 7, wedged, protected and mounted by its system of elements of inert material 8 and 9.
The simple assembly, according to the invention, of the two sections completes a pyrotechnic chain having an annular primer or booster according to the invention which initiates the toroidal waves sought for.
The annular booster may be made of tetryl, the inert material may 'be made of Rilsan or an elastomer, and the principal explosive charge may 'be made of a mixture (6040) of hexogene (RDX) and ltolite (TNT).
The intermediate element 10 may be powder. The fuse primer 63 may be made of any of the various constructions and compositions well known to the art.
What is claimed is:
1. An explosive device having a casing, a principal explosive charge in said casing, said principal charge having a cavity with a lining to confer a hollow charge effect, fuse means, and a booster assembly positioned rearwardly of said principal charge, said assembly comprising a substantially cylindrical block of explosively inert material having a frusto-conic-al cavity, a conical plug of explosively inert material positioned in said frusto-conical cavity and smaller than said cavity, said plug and said block defining an annular chamber of frusto-conical shape having its larger end adjacent the principal charge, and a block of booster explosive in said chamber, the larger surface of said booster explosive block being in direct physical contact with the principal charge and the lesser surface being pyrotechnically connected with said fuse means.
2. The explosive device claimed in claim 1 in which the rear end of the principal charge and the forward end of the booster block are planar surfaces and are merged with one another, the outer diameter of the forward end 3 of the 'booster block being substantially equal to 'the diameter of the rear end of the principal charge.
3. The explosive device claimed in claim 1 and including a disc-like intermediate block of priming explosive having a thickness substantially less than its diameter, said intermediate block of priming explosive "being in contact with said booster block on one side and pyrotechnically connected to the fuse on the other.
4. The explosive device claimed in claim 3 wherein the intermediate block of priming explosive has a diameter substantially equal to the smaller diameter of the frus'toconical booster block.
5. The explosive device claimed in claim 3 wherein the intermediate block of priming explosive has a diameter slightly larger than the smaller diameter of the 'frustoconical booster block.
6. The explosive device claimed in claim 3 wherein the surface of the forward end of the intermediate block of priming explosive is merged With the surface of the rear end of the frusto-conical mass of booster explosive.
4 References Cited UNITED STATES PATENTS 2,809,585 10/1957 Moses l0256 2,843,041 7/1958 Stewart l0256 3,077,834 2/1963 Caldwell 102-24 3,100,445 8/1963 Poulter l0224 2,713,825 7/1955 Liljegren l0270 3,186,341 6/1965 Bjorklund et a1. 10286.5 3,238,872 3/1966 Zernow et a1. l0224 FOREIGN PATENTS 26,986 4/1954 Finland. 228,090 6/1963 Austria. 970,395 9/1964 Great Britain. 622,062 4/ 1949 Great Britain.
BENJAMIN A. BORCHELT, Primary Examiner.
JAMES FOX, Assistant Examiner.
U.S. Cl. X.R. 10224, 70

Claims (1)

1. AN EXPLOSIVE DEVICE HAVING A CASING, A PRINCIPAL EXPLOSIVE CHARGE IN SAID CASING, SAID PRINCIPAL CHARGE HAVING A CAVITY WITH A LINING TO CONFER A HOLLOW CHARGE EFFECT, FUSE MEANS, AND A BOOSTER ASSEMBLY POSITIONED REARWARDLY OF SAID PRINCIPAL CHARGE, SAID ASSEMBLY COMPRISING A SUBSTANTIALLY CYLINDRICAL BLOCK OF EXPLOSIVELY INERT MATERIAL HAVING A FRUSTO-CONICAL CAVITY, A CONICAL PLUG OF EXPLOSIVELY INERT MATERIAL POSITIONED IN SAID FRUSTO-CONICAL CAVITY AND SMALLER THAN SAID CAVITY, SAID PLUG AND SAID BLOCK DEFINING AN ANNULAR CHAMBER OF FRUSTO-CONICAL SHAPE HAVING ITS LARGER END ADJACENT THE PRINCIPAL CHARGE, AND A BLOCK OF BOOSTER EXPLOSIVE IN SAID CHAMBER, THE LARGER SURFACE OF SAID BOOSTER EXPLOSIVE BLOCK BEING IN DIRECT PHYSICAL CONTACT WITH THE PRINCIPAL CHARGE AND THE LESSER SURFACE BEING PYROTECHNICALLY CONNECTED WITH SAID FUSE MEANS.
US437633A 1964-03-03 1965-03-02 Priming explosive devices Expired - Lifetime US3451339A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658007A (en) * 1968-03-08 1972-04-25 Dynamit Nobel Ag Hollow bursting charge
US3662684A (en) * 1969-10-27 1972-05-16 Ferges De Zeebrugge Sa Hollow charge warhead
US3736875A (en) * 1969-09-23 1973-06-05 Dynamit Nobel Ag Explosive charge with annular ignition gap
US4331081A (en) * 1980-07-25 1982-05-25 C-I-L Inc. Explosive booster
US4672896A (en) * 1984-08-21 1987-06-16 Societe D'etudes, De Realisations Et D'applications Techniques Hollow charges
US5196646A (en) * 1990-10-03 1993-03-23 Curators Of The University Of Missouri Dual purpose fuze
US6393991B1 (en) 2000-06-13 2002-05-28 General Dynamics Ordnance And Tactical Systems, Inc. K-charge—a multipurpose shaped charge warhead
US20050115391A1 (en) * 2003-10-14 2005-06-02 Baker Ernest L. Method and apparatus to improve perforating effectiveness using a unique multiple point initiated shaped charge perforator
WO2015130198A1 (en) * 2014-02-26 2015-09-03 Saab Ab Initiating device and method for manufacturing such a device
US20160216085A1 (en) * 2015-01-27 2016-07-28 The United State Of America As Represented By The Secretary Of The Navy Structure for Shaping and Applying a Propagating Shock Wave to an Area of an Explosive Load to Increase an Energetic Shock Impact Effect on a Target
WO2020027736A1 (en) * 2018-07-31 2020-02-06 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US20220074719A1 (en) * 2020-03-03 2022-03-10 Geodynamics, Inc. Asymmetric initiated shaped charge and method for making a slot-like perforation

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308906A1 (en) * 1975-04-23 1976-11-19 Luchaire Sa Hollow explosive charge fuse - has air chamber between priming charge and apex of hollow charge sheathing
DE2841040C2 (en) * 1978-09-21 1985-09-12 Diehl GmbH & Co, 8500 Nürnberg Explosive device with an explosive charge that can be ignited by a detonator
SE8200194L (en) * 1982-01-15 1983-07-16 Bofors Ab CHARGE
FR2549949B1 (en) * 1983-07-28 1987-01-16 Commissariat Energie Atomique METHOD AND DEVICE FOR CONFORMING A DETONATION WAVE

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB622062A (en) * 1946-03-09 1949-04-26 D Entpr Et De Mecanique Soc In Improvements in blasting devices
FI26986A (en) * 1949-12-14 1954-11-30 Tampereen Pellava Ja Rautateol Explosive ordnance
US2713825A (en) * 1944-09-23 1955-07-26 Lyle K Liljegren Fuze
US2809585A (en) * 1949-11-16 1957-10-15 Sidney A Moses Projectile for shaped charges
US2843041A (en) * 1953-12-14 1958-07-15 Exxon Research Engineering Co Deep perforation of subsurface formations
US3077834A (en) * 1958-07-14 1963-02-19 Jet Res Ct Inc Lined shaped explosive charge and liner therefor
AT228090B (en) * 1962-02-05 1963-06-25 John Olof Bjoerklund HE grenade
US3100445A (en) * 1959-01-14 1963-08-13 Borg Warner Shaped charge and method of firing the same
GB970395A (en) * 1960-04-05 1964-09-23 John Olof Bjorklund Improvements in armour piercing projectiles
US3186341A (en) * 1961-10-06 1965-06-01 Bjorklund John Olof Igniter with separated layers of explosive
US3238872A (en) * 1964-02-10 1966-03-08 Aerojet General Co Shaped charge construction

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713825A (en) * 1944-09-23 1955-07-26 Lyle K Liljegren Fuze
GB622062A (en) * 1946-03-09 1949-04-26 D Entpr Et De Mecanique Soc In Improvements in blasting devices
US2809585A (en) * 1949-11-16 1957-10-15 Sidney A Moses Projectile for shaped charges
FI26986A (en) * 1949-12-14 1954-11-30 Tampereen Pellava Ja Rautateol Explosive ordnance
US2843041A (en) * 1953-12-14 1958-07-15 Exxon Research Engineering Co Deep perforation of subsurface formations
US3077834A (en) * 1958-07-14 1963-02-19 Jet Res Ct Inc Lined shaped explosive charge and liner therefor
US3100445A (en) * 1959-01-14 1963-08-13 Borg Warner Shaped charge and method of firing the same
GB970395A (en) * 1960-04-05 1964-09-23 John Olof Bjorklund Improvements in armour piercing projectiles
US3186341A (en) * 1961-10-06 1965-06-01 Bjorklund John Olof Igniter with separated layers of explosive
AT228090B (en) * 1962-02-05 1963-06-25 John Olof Bjoerklund HE grenade
US3238872A (en) * 1964-02-10 1966-03-08 Aerojet General Co Shaped charge construction

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658007A (en) * 1968-03-08 1972-04-25 Dynamit Nobel Ag Hollow bursting charge
US3736875A (en) * 1969-09-23 1973-06-05 Dynamit Nobel Ag Explosive charge with annular ignition gap
US3662684A (en) * 1969-10-27 1972-05-16 Ferges De Zeebrugge Sa Hollow charge warhead
US4331081A (en) * 1980-07-25 1982-05-25 C-I-L Inc. Explosive booster
US4672896A (en) * 1984-08-21 1987-06-16 Societe D'etudes, De Realisations Et D'applications Techniques Hollow charges
US5196646A (en) * 1990-10-03 1993-03-23 Curators Of The University Of Missouri Dual purpose fuze
US6393991B1 (en) 2000-06-13 2002-05-28 General Dynamics Ordnance And Tactical Systems, Inc. K-charge—a multipurpose shaped charge warhead
US6925924B2 (en) * 2003-10-14 2005-08-09 Molycorp Inc. Method and apparatus to improve perforating effectiveness using a unique multiple point initiated shaped charge perforator
US20050115391A1 (en) * 2003-10-14 2005-06-02 Baker Ernest L. Method and apparatus to improve perforating effectiveness using a unique multiple point initiated shaped charge perforator
US20050188878A1 (en) * 2003-10-14 2005-09-01 Baker Ernest L. Unique multiple point initiated shaped charge perforator and method for its use
WO2015130198A1 (en) * 2014-02-26 2015-09-03 Saab Ab Initiating device and method for manufacturing such a device
US10024642B2 (en) 2014-02-26 2018-07-17 Saab Ab Initiating device and method for manufacturing such a device
US20160216085A1 (en) * 2015-01-27 2016-07-28 The United State Of America As Represented By The Secretary Of The Navy Structure for Shaping and Applying a Propagating Shock Wave to an Area of an Explosive Load to Increase an Energetic Shock Impact Effect on a Target
WO2020027736A1 (en) * 2018-07-31 2020-02-06 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US12104887B2 (en) 2018-07-31 2024-10-01 Orica International Pte Ltd Explosive device configured for producing a quasi-planar shock wave
US20220074719A1 (en) * 2020-03-03 2022-03-10 Geodynamics, Inc. Asymmetric initiated shaped charge and method for making a slot-like perforation

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FR1549158A (en) 1968-12-13
DE1478008A1 (en) 1970-04-23

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