US3134329A - Exploding bridgewire coating - Google Patents

Exploding bridgewire coating Download PDF

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Publication number
US3134329A
US3134329A US193729A US19372962A US3134329A US 3134329 A US3134329 A US 3134329A US 193729 A US193729 A US 193729A US 19372962 A US19372962 A US 19372962A US 3134329 A US3134329 A US 3134329A
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United States
Prior art keywords
bridgewire
coating
silicate
water
squib
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Expired - Lifetime
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US193729A
Inventor
Zeman Samuel
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ATK Launch Systems LLC
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Thiokol Corp
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Publication date
Priority to NL133269D priority Critical patent/NL133269C/xx
Priority to NL292575D priority patent/NL292575A/xx
Priority to BE632157D priority patent/BE632157A/xx
Priority to US193729A priority patent/US3134329A/en
Application filed by Thiokol Corp filed Critical Thiokol Corp
Priority to GB18174/62A priority patent/GB972664A/en
Priority to FR934275A priority patent/FR1364664A/en
Priority to CH590663A priority patent/CH439051A/en
Priority to SE5219/63A priority patent/SE321431B/xx
Priority to DET23979A priority patent/DE1235205B/en
Application granted granted Critical
Publication of US3134329A publication Critical patent/US3134329A/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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • 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
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
    • 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
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/125—Bridge initiators characterised by the configuration of the bridge initiator case

Definitions

  • This invention relates to electrically actuated deflagrating squibs, and more particularly to electrically actuated deflagrating squibs of the exploding bridgewire type. Deflagrating squibs of the exploding bridgewire type have found increasing use, particularly as a means of initiating the ignition of solid-propellant rocket charges,
  • the bridgewire may be heated to incandescence or to its fusion point, accidentally actuating the squib. Again, the bridgewire -may be'subjected to prolonged electrical heating and, although not heated to incandescence, may raise the temperature of the pyrotechnic charge to the point at which it. will undergo, auto-ignition.
  • Structural and/ or chemical alterations may be made to overcome such problems, but the more resistant to accidental actuation an EBW squib is made, the more resistant to intentional actuation 'it may become.
  • the delay time, or time to full ignition of the pyrotechnic charge following actuation may be seriously affected. In extreme instances, a squib may be made so safe that actuation is unpredictable or problematical.
  • Such a squib comprises a body 1, usually of metal, with a pair of electrodes 2 for contact with a mating connector (not shown) and electrically insulated from each other and from the squib body 1 by insulator 3, composed of glass,
  • the diaphragm 7 may be coated on the side opposite the bridgewire 5 with a very fast-burning pyrotechnic composition 10, composed of any such as are knownin the art.
  • a main pyrotechnic charge 11 which may be any of those common in the art or composed as described in copending application Serial Number 60,134, filed October 3, 1960, is placed above the diaphragm'7.
  • a cl0- sure 12 commonly of metal foil, retains and seals the main charge 11.
  • compositions of the present invention which are applied as a coating '6 to the bridgewire 5, are composed of finely divided particles, 44 microns or smaller in size, of a secondary explosive, suchjas pentaerythritol tetranitrate (PETN), bound with a water soluble inorganic 'alkali silicate, such as sodium silicate.
  • a secondary explosive suchjas pentaerythritol tetranitrate (PETN)
  • PTN pentaerythritol tetranitrate
  • a water soluble inorganic 'alkali silicate such as sodium silicate.
  • the silicate com- A preferred composition which has been found suitable for. use in EBW squibs suchas that shown in the drawing is prepared by mixing 30 parts by weight of purified PETN, finer than 325 mesh, With 70 parts by weight of a solution of sodium silicate in water.
  • the silicate solution for this example has a hydrometer value of 40' degrees B-
  • the ratio of silicate binder to secondary explosive may be adjusted in a manner that gives optimum balance between the mechanical properties needed for adhesion and strength, and the chemical properties needed for rapid reaction.
  • compositions ranging from 40 to 70% secondary explosive bound with 30 to 60% silicate binder, on a dry weight basis may-be employed.
  • a number of secondary explosives other than PETN have been found suitable for use in the compositions of the present invention.
  • Such materials as, for example, cyclotrimethylenetrinitramine (RDX) may be employed.
  • a preferred silicate binder is composed of sodium silicate (water glass) which has a formula designation of Na O-(SiO where x is approximately 3. Alternate names and formulae for the primary ingredient of the binder are sodium tetrasilicate, Na Si O or water soluble silicates, such as sodium metalsilicate, Na SiO or potassium disilicate, K Si O I
  • the coating compositions of the present invention per-' 7 form several functions. They act as both electrical and thermal insulators, as heat sinks, and as radiators to prevent localized overheating due to accidental passage of electrical energy through the bridgewire. In addition, when the bridgewire is exploded upon deliberate actuation, the coating contributes to the explosive energy released, rupturing the diaphragm and igniting the pyrotechnic charges.
  • Uncoated bridgewires when used in a squib such as is shown in the drawing, frequently 'do not release sufficient energy to rupture the diaphragm and ignite the pyrotechnic charges. If the thickness of the diaphragm is reduced, or if the diaphragm is spaced in closer proximity to the bridgewire, the squib may he accidentally actuated by passage of suflicient electrical energy through the bridgewire to heat it to incandescence or to fuse it. Accidental actuation is even more likely in squibs in which a diaphragm is not used. Exploding bridgewire squibs, employing bridgewires coated with compositions it should not be limited thereto, for obvious modifications will occur to those skilled in the art without departing from the spirit of the invention or the scope of the subjoined claims.
  • silicate binder consists of at least one silicate selected from the class consisting of water-soluble sodium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium silicate compounds.
  • silicate binder consists of at least one silicate selected from the class consisting of water-soluble potassium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble potassium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium and potassiumsilicate compounds.
  • A'coating for an exploding bridgewire in a defilagrating squib said coating consisting of a finely divided secondary explosive in awater-soluble inorganic silicate binder.
  • silicate binder consists of at least one silicate selected from the .class consisting of'water-soluble sodium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium silicate compounds.
  • silicate binder consists of at least one silicate selected from the class consisting of Water-soluble potassium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble potassium silicate compounds.
  • silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium and potassium silicate compounds.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Paints Or Removers (AREA)
  • Air Bags (AREA)

Description

May 26, 1964 s. ZEMAN 3,134,329
. EXPLODING BRIDGEWIRE COATING Filed May 10, 1962 SAMUEL ZEMAN INVENTOR.
BY WW ATTORNEY 3,134,329 r EXPLODING BRIDGEWIRE COATING ,Samuel Zeman, Huntsville, Ala, assignor to: Thiokol Chemical Corporation, Bristol, Pa., a corporation of Delaware Filed May 10, 1962, Ser. No. 193,729 18 Claims. (Cl. 102-28) This invention relates to electrically actuated deflagrating squibs, and more particularly to electrically actuated deflagrating squibs of the exploding bridgewire type. Deflagrating squibs of the exploding bridgewire type have found increasing use, particularly as a means of initiating the ignition of solid-propellant rocket charges,
because of their resistance to accidental actuation. Very high values of electrical energy (2 0,000,000 ergs) must be applied to the bridgewire in a very short time (less than 4 microseconds) to cause it to develop the characteristic high temperature and high pressure shock wave phenomenon known as bridgewire explosion. The energy of this explosion is transmitted to a pyrotechnic charge, causing it to ignite; Accidental subjection of the bridgewire to less intense or less concentrated electrical energy will not ordinarily explodefthe bridgewire F and actuate the squib. Further, the pyrotechnic compositions used are such that they will not, normally, ignite when the bridgewire is heated by relatively low intensity electrical current, accidentally applied directly 'or induced by extraneous sources of electrical energy. 1, Although recent prior art exploding bridgewire (EBW) fsquibs are more resistant to accidental actuation than prior art ignition devices, there are a number of circumstances under which theymay he accidentally actuated.
If subjected to electrical energies slightly below those required to -explode the bridgewire, the bridgewire may be heated to incandescence or to its fusion point, accidentally actuating the squib. Again, the bridgewire -may be'subjected to prolonged electrical heating and, although not heated to incandescence, may raise the temperature of the pyrotechnic charge to the point at which it. will undergo, auto-ignition.
Structural and/ or chemical alterations may be made to overcome such problems, but the more resistant to accidental actuation an EBW squib is made, the more resistant to intentional actuation 'it may become. In addition, the delay time, or time to full ignition of the pyrotechnic charge following actuation, may be seriously affected. In extreme instances, a squib may be made so safe that actuation is unpredictable or problematical.
In spite of such problems, however, service requirements constantly call for EBW squibs with increased resistance to accidental actuation without increased delay time.
It is, therefore, an object of the present invention to provide an improved EBW squib which has greater resistance to accidental actuation. It is a further object of of the invention is advantageously employed. Such a squib comprises a body 1, usually of metal, with a pair of electrodes 2 for contact with a mating connector (not shown) and electrically insulated from each other and from the squib body 1 by insulator 3, composed of glass,
United States Patent Ofilice [oration of the Water, is PETN and 50% sodium plastic, or similar electrically insulating material. An additional electrical insulator 4 may also be employed. The pair of electrodes 2 isbridged within the squib by a bridgewire 5, usually of noble metal or noble metal alloy. A coating 6, employing a composition of the present invention, is applied to the bridgewire 5, completely covering it. 1
A thin, rupturable diaphragm 7 of, for example, 1 to 2 mil thick lead foil, is held in spaced relation to the bridgewire 5 by an electrically insulating spacer 8 and a retaining spacer 9, which may be of metal. The diaphragm 7 may be coated on the side opposite the bridgewire 5 with a very fast-burning pyrotechnic composition 10, composed of any such as are knownin the art. A main pyrotechnic charge 11, which may be any of those common in the art or composed as described in copending application Serial Number 60,134,, filed October 3, 1960, is placed above the diaphragm'7. A cl0- sure 12, commonly of metal foil, retains and seals the main charge 11.
The compositions of the present invention, which are applied as a coating '6 to the bridgewire 5, are composed of finely divided particles, 44 microns or smaller in size, of a secondary explosive, suchjas pentaerythritol tetranitrate (PETN), bound with a water soluble inorganic 'alkali silicate, such as sodium silicate. The silicate com- A preferred composition which has been found suitable for. use in EBW squibs suchas that shown in the drawing is prepared by mixing 30 parts by weight of purified PETN, finer than 325 mesh, With 70 parts by weight of a solution of sodium silicate in water. The silicate solution for this example has a hydrometer value of 40' degrees B-aum, a density of 1.38 grams per cubic centimeter, and a ratio of Na O to SiO of 1:3.25. The
- mixture is coated onto the bridgewire 5 and the insulator 3 to the desired thickness, and the partially assembled squib is then heated in an oven to drive oif the water. The final composition ;on a dry weight basis, after evapsilicate. V
In practice, the ratio of silicate binder to secondary explosive may be adjusted in a manner that gives optimum balance between the mechanical properties needed for adhesion and strength, and the chemical properties needed for rapid reaction. Depending upon the effect desired and the electrical energy provided for actuation, compositions ranging from 40 to 70% secondary explosive bound with 30 to 60% silicate binder, on a dry weight basis, may-be employed.
A number of secondary explosives other than PETN have been found suitable for use in the compositions of the present invention. Such materials as, for example, cyclotrimethylenetrinitramine (RDX) may be employed.
A preferred silicate binder is composed of sodium silicate (water glass) which has a formula designation of Na O-(SiO where x is approximately 3. Alternate names and formulae for the primary ingredient of the binder are sodium tetrasilicate, Na Si O or water soluble silicates, such as sodium metalsilicate, Na SiO or potassium disilicate, K Si O I The coating compositions of the present invention per-' 7 form several functions. They act as both electrical and thermal insulators, as heat sinks, and as radiators to prevent localized overheating due to accidental passage of electrical energy through the bridgewire. In addition, when the bridgewire is exploded upon deliberate actuation, the coating contributes to the explosive energy released, rupturing the diaphragm and igniting the pyrotechnic charges.
Uncoated bridgewires, when used in a squib such as is shown in the drawing, frequently 'do not release sufficient energy to rupture the diaphragm and ignite the pyrotechnic charges. If the thickness of the diaphragm is reduced, or if the diaphragm is spaced in closer proximity to the bridgewire, the squib may he accidentally actuated by passage of suflicient electrical energy through the bridgewire to heat it to incandescence or to fuse it. Accidental actuation is even more likely in squibs in which a diaphragm is not used. Exploding bridgewire squibs, employing bridgewires coated with compositions it should not be limited thereto, for obvious modifications will occur to those skilled in the art without departing from the spirit of the invention or the scope of the subjoined claims.
What is claimed is:
1. In a deflagrating squib of the exploding bridgewire type, the combination with a bridgewire of a limitedly detonating coating applied to said bridgewire, said coating consisting of a finely divided secondary explosive in .a Water-soluble inorganic silicate binder.
2. The combination, as in claim 1, wherein said secondary explosive consists of particles that are 44 microns or smaller in size.
3. The combination, as in claim 1, wherein said secondary explosive is pentaerythritol tetranitrate.
4. The combination, as in claim 1, wherein said secondary explosive is cyclotrimethylenetrinitramine.
5. The combination, as in claim 1, wherein said silicate binder consists of at least one silicate selected from the class consisting of water-soluble sodium silicate compounds.
6. The combination, as in claim 1, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium silicate compounds.
7. The combination, as in claim 1, wherein said silicate binder consists of at least one silicate selected from the class consisting of water-soluble potassium silicate compounds.
8. The combination, as in claim 1, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble potassium silicate compounds.
9. The combination, as in claim 1, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium and potassiumsilicate compounds.
. 1 0. A'coating for an exploding bridgewire in a defilagrating squib, said coating consisting of a finely divided secondary explosive in awater-soluble inorganic silicate binder.
11. A coating, as in claim 10, wherein said secondary explosive consists of particles that are 44 microns or smaller in size.
12. A coating, as in claim 10, wherein said secondary explosive is pentaerythritol tetranitrate.
13. A coating, as in claim 10, wherein said secondary explosive is cyclotrimethylenetrinitramine.
14. A coating, as in claim 10, wherein said silicate binder consists of at least one silicate selected from the .class consisting of'water-soluble sodium silicate compounds.
15. A coating, as in claim 10, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium silicate compounds.
16. A coating, as in claim 10, wherein said silicate binder consists of at least one silicate selected from the class consisting of Water-soluble potassium silicate compounds.
17. A coating, as in claim 10, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble potassium silicate compounds.
18. A coating, as in claim 10, wherein said silicate binder consists of a mixture of silicates selected from the class consisting of water-soluble sodium and potassium silicate compounds.
References Cited in the file of this patent UNITED STATES PATENTS 2,926,566 Atkins et al. Mar. 1, 1960 2,982,639 Gey May 2, 1961 2,992,087 I Fassnacht July 11, 1961 3,040,660 Johnston June 26, 1962 3,048,507 Zebree Aug. 7, 1962 3,054,258 Marti Sept. 18, 1962 3,059,576 Haefner Oct. 23, 1962

Claims (1)

10. A COATING FOR AN EXPLODING BRIDGEWIRE IN A DEFLAGRATING SQUIB, SAID COATING CONSISTING OF A FINELY DIVIDED SECONDARY EXPLOSIVE IN A WATER-SOUBLE INORGANIC SILICATE BINDER.
US193729A 1962-05-10 1962-05-10 Exploding bridgewire coating Expired - Lifetime US3134329A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL133269D NL133269C (en) 1962-05-10
NL292575D NL292575A (en) 1962-05-10
BE632157D BE632157A (en) 1962-05-10
US193729A US3134329A (en) 1962-05-10 1962-05-10 Exploding bridgewire coating
GB18174/62A GB972664A (en) 1962-05-10 1963-05-08 Deflagrating squib
FR934275A FR1364664A (en) 1962-05-10 1963-05-09 Explosive detonator
CH590663A CH439051A (en) 1962-05-10 1963-05-10 Igniting charge
SE5219/63A SE321431B (en) 1962-05-10 1963-05-10
DET23979A DE1235205B (en) 1962-05-10 1963-05-10 Electric bridge igniter

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CH (1) CH439051A (en)
DE (1) DE1235205B (en)
GB (1) GB972664A (en)
NL (2) NL292575A (en)
SE (1) SE321431B (en)

Cited By (37)

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Publication number Priority date Publication date Assignee Title
US3272127A (en) * 1963-08-05 1966-09-13 Robert E Betts Igniter squib
DE1258771B (en) * 1965-03-09 1968-01-11 Montage Technik Anstalt F Process for firing propellant charges for powder-powered bolt setting tools and propellant charge for this
US3791298A (en) * 1971-01-18 1974-02-12 France Etat Electrical switching device employing a vaporizable conductive element
US3831523A (en) * 1967-01-04 1974-08-27 Us Army Electroexplosive device
FR2307248A1 (en) * 1973-07-12 1976-11-05 Poudres & Explosifs Ste Nale Igniter assembly for propellant or other charges - with directional divergent beam of incandescent particles and casing constructed to resist premature disintegration
US4686903A (en) * 1984-05-21 1987-08-18 Ems-Inventia AG Method of manufacturing a pole body for an electric fuse, pole body for an electric fuse and method of using the pole body
US4715280A (en) * 1984-05-24 1987-12-29 Ems-Inventa Ag Pole body for an electric fuze, method of manufacturing and method of using the pole body
DE3735405A1 (en) * 1987-10-20 1989-05-11 Dynamit Nobel Ag IGNITION PILL
US4831932A (en) * 1987-08-17 1989-05-23 Honeywell Inc. Detonator
US4938137A (en) * 1989-06-05 1990-07-03 Guay Roland H Exploding bridgewire driven multiple flyer detonator
US4989515A (en) * 1989-08-08 1991-02-05 The United States Of America As Represented By The United States Department Of Energy Ignitor with stable low-energy thermite igniting system
US5140906A (en) * 1991-11-05 1992-08-25 Ici Americas, Inc. Airbag igniter having double glass seal
US5404263A (en) * 1992-08-27 1995-04-04 Oea, Inc. All-glass header assembly used in an inflator system
US5691499A (en) * 1996-08-07 1997-11-25 Morton International, Inc. Bridgewire ladder initiator
US5709724A (en) * 1994-08-04 1998-01-20 Coors Ceramics Company Process for fabricating a hermetic glass-to-metal seal
US5939660A (en) * 1997-03-12 1999-08-17 Trw Inc. Inflator for an inflatable vehicle occupant protection device
US5988069A (en) * 1996-11-12 1999-11-23 Universal Propulsion Company, Inc. Electric initiator having a sealing material forming a ceramic to metal seal
FR2781878A1 (en) * 1998-07-31 2000-02-04 Giat Ind Sa PROCESS FOR IMPLEMENTING A PYROTECHNIC SUBSTANCE AND PYROTECHNIC INITIATOR OBTAINED WITH SUCH A METHOD
US6230624B1 (en) 1999-08-13 2001-05-15 Trw Inc. Igniter having a hot melt ignition droplet
US6274252B1 (en) * 1994-08-04 2001-08-14 Coors Ceramics Company Hermetic glass-to-metal seal useful in headers for airbags
US6422145B1 (en) 1997-11-06 2002-07-23 Rocktek Ltd. Controlled electromagnetic induction detonation system for initiation of a detonatable material
EP1377791A1 (en) * 2001-03-31 2004-01-07 Robert Bosch Gmbh Bridge igniter
US20040007911A1 (en) * 2002-02-20 2004-01-15 Smith David Carnegie Apparatus and method for fracturing a hard material
US6679175B2 (en) 2001-07-19 2004-01-20 Rocktek Limited Cartridge and method for small charge breaking
US6708619B2 (en) 2000-02-29 2004-03-23 Rocktek Limited Cartridge shell and cartridge for blast holes and method of use
EP1455160A1 (en) * 2003-03-03 2004-09-08 Schott Glas Metal-fixing-material-passage and method of manufacturing a header with a metal-fixing-material-passage
EP1457758A1 (en) * 2003-03-08 2004-09-15 Dynamit Nobel AIS GmbH Automotive Ignition Systems Glass-passage for pyrotechnical initiator
EP1808667A3 (en) * 2003-03-03 2007-08-01 Schott AG Metal fusing material and method for manufacturing a carrier for a duct with metal fusing material
EP1813906A1 (en) 2006-01-27 2007-08-01 Schott AG Glass-to-fixing-material bushing and use thereof as well as airbag and seat-belt tensioner with an initiatot
WO2008064858A1 (en) 2006-11-28 2008-06-05 Schott Ag Firing apparatus for a pyrotechnic protection apparatus
US20080250963A1 (en) * 2003-03-03 2008-10-16 Schott Ag Metal fixing material bushing and method for producing a base plate of a metal fixing material bushing
US20130239834A1 (en) * 2012-03-14 2013-09-19 A & O Technologie Gmbh Igniter base for pyrotechnic devices
US8733250B2 (en) 2006-01-27 2014-05-27 Schott Ag Metal-sealing material-feedthrough and utilization of the metal-sealing material feedthrough with an airbag, a belt tensioning device, and an ignition device
EP2743632A1 (en) * 2012-12-11 2014-06-18 Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO Miniature electro-pyrotechnic igniter, and ignition head for the same
US9423218B2 (en) 2010-09-17 2016-08-23 Schott Ag Method for producing a ring-shaped or plate-like element
US20180299235A1 (en) * 2017-04-13 2018-10-18 Agency For Defense Development Initiator for rocket motor
US10684102B2 (en) 2010-09-17 2020-06-16 Schott Ag Method for producing a ring-shaped or plate-like element

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US2982639A (en) * 1953-01-27 1961-05-02 William A Gey Explosive compositions
US2992087A (en) * 1959-11-03 1961-07-11 Du Pont New explosive
US3040660A (en) * 1944-11-08 1962-06-26 Lawrence H Johnston Electric initiator with exploding bridge wire
US3048507A (en) * 1956-12-31 1962-08-07 Hercules Powder Co Ltd Matchhead igniters and compositions and method for their manufacture
US3054258A (en) * 1957-10-28 1962-09-18 Standard Oil Co Temperature rise retardation of surfaces exposed to heat
US3059576A (en) * 1958-09-26 1962-10-23 Conax Corp Electrically fired detonator

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US3040660A (en) * 1944-11-08 1962-06-26 Lawrence H Johnston Electric initiator with exploding bridge wire
US2982639A (en) * 1953-01-27 1961-05-02 William A Gey Explosive compositions
US2926566A (en) * 1956-11-30 1960-03-01 Walter W Atkins Device for accelerating the ignition of the propellant for a projectile
US3048507A (en) * 1956-12-31 1962-08-07 Hercules Powder Co Ltd Matchhead igniters and compositions and method for their manufacture
US3054258A (en) * 1957-10-28 1962-09-18 Standard Oil Co Temperature rise retardation of surfaces exposed to heat
US3059576A (en) * 1958-09-26 1962-10-23 Conax Corp Electrically fired detonator
US2992087A (en) * 1959-11-03 1961-07-11 Du Pont New explosive

Cited By (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3272127A (en) * 1963-08-05 1966-09-13 Robert E Betts Igniter squib
DE1258771B (en) * 1965-03-09 1968-01-11 Montage Technik Anstalt F Process for firing propellant charges for powder-powered bolt setting tools and propellant charge for this
US3831523A (en) * 1967-01-04 1974-08-27 Us Army Electroexplosive device
US3791298A (en) * 1971-01-18 1974-02-12 France Etat Electrical switching device employing a vaporizable conductive element
FR2307248A1 (en) * 1973-07-12 1976-11-05 Poudres & Explosifs Ste Nale Igniter assembly for propellant or other charges - with directional divergent beam of incandescent particles and casing constructed to resist premature disintegration
US4686903A (en) * 1984-05-21 1987-08-18 Ems-Inventia AG Method of manufacturing a pole body for an electric fuse, pole body for an electric fuse and method of using the pole body
US4715280A (en) * 1984-05-24 1987-12-29 Ems-Inventa Ag Pole body for an electric fuze, method of manufacturing and method of using the pole body
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CH439051A (en) 1967-06-30
DE1235205B (en) 1967-02-23
GB972664A (en) 1964-10-14
NL133269C (en)
SE321431B (en) 1970-03-02
NL292575A (en)
BE632157A (en)

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