US3899973A - Ignition device for explosive charges - Google Patents

Ignition device for explosive charges Download PDF

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Publication number
US3899973A
US3899973A US822413A US82241369A US3899973A US 3899973 A US3899973 A US 3899973A US 822413 A US822413 A US 822413A US 82241369 A US82241369 A US 82241369A US 3899973 A US3899973 A US 3899973A
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US
United States
Prior art keywords
percent
combustible material
burning velocity
ignition device
rigid
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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US822413A
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English (en)
Inventor
Alain Brocart
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.)
Societe Nationale des Poudres et Explosifs
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Societe Nationale des Poudres et Explosifs
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Filing date
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Application filed by Societe Nationale des Poudres et Explosifs filed Critical Societe Nationale des Poudres et Explosifs
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Publication of US3899973A publication Critical patent/US3899973A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/465—Synchronisation of the PAL-switch

Definitions

  • An ignition device for igniting explosive Charges comprises a rigid combustible material having a high burn- [52] US. Cl 102/27 R; 102/70 R; 102/DIG. 1 ing velocity and a low-energy detonating fuse disposed [51] Int. Cl. F42b 7/00 on an axis therein, the gn n device n in ng no [58] Field of Search 102/38, 38 CC, 39, 46, black powder.
  • Satisfactory ignition of explosive devices is a critical factor in the efficiency of performance of the charge.
  • satisfactory operation of solid propergols depends very largely upon the initial phase of combustion i.e. upon the ignition of the propergol block.
  • black powder is a complex mixture that quality of which may vary considerably, thus affecting the operation of the ignition devices and leading to non-reproducibility and uncertain results. Furthermore, black powder itself is particularly difficult, especially as regards safety, to manufacture and use.
  • an ignition device comprising a body of a rigid combustible material of high burning velocity having a low-energy detonating fuse disposed therein, the fuse being connected to a primer by means of a priming system.
  • the body is of tubular form and the lowenergy detonating fuse is disposed along its major axis, the tubular body being rigidly secured to a base member which is provided with means for securing the member in a cartridge-case base, the base member bearing the primer and the priming system for the fuse.
  • a wide range of rigid combustible materials can be used for the purposes of this invention according to the burning and mechanical properties required.
  • a general characteristic shared by many of these materials, however, is the heterogeneity of their structure, comprising as they do fuel elements having a high burning velocity and, in adj ition, a material which has a lower burning velocity but which imparts mechanical strength to the body as a whole.
  • One example of a rigid combustible material useful in the igniters of the invention comprises one or more felt members comprising a high percentage (70 to 90 percent) of nitrocellulose having a nitrogen content of from 12.6 to 14.1 percent as the fuel element of high burning velocity and a low percentage to 30 percent) of cellulose together with a resin binder and a stabiliser as the combustible substance of lower burning speed imparting mechanical strength to the body.
  • a metal in finely divided state can also be added to this mixture in order to accelerate the ignition of the charge.
  • the resin binder may be an acrylic, polyvinyl, acrylonitrile, methylolated urea-formol or a forrnolmelamine resin or a combustible resin such as nitrocellulose or polyvinyl nitrate; the binder preferably being used in a proportion of from 5 to 15 percent.
  • Any conventional powder stabiliser may be used with the binder, such as diphenylamine, Centralite, or nitrodiphenylamine.
  • diphenylamine Centralite
  • nitrodiphenylamine In the case of single-base powders, the commonest practice is to use diphenylamine in a proportion of from 0.7 to 1.2 percent, whereas with double-base powders, Centralite is used in a proportion of from 2 to 3 percent.
  • Typical finely divided metals which may be included in the rigid combustible material are the reducing metals such as aluminium, beryllium and zirconium, the particle size being from 30 to 6011,
  • FIG. I is a sectional elevation view of the ignition device.
  • the ignition device comprises a tubular member 1, which is made of a rigid combustible material, along whose axis a low-energy detonating fuse 2 is disposed.
  • Member 1 is rigidly secured to a base member 3 which is screw threaded to secure the base member in a cartridge case base.
  • Member 3 also bears a priming system 4 for the fuse, an electric primer 5, and sealing means 6 to avoid gas leaks.
  • Tubular member 1 is prepared from an aqueous suspension containing 81 percent nitrocellulose (having a nitrogen content of 13.35 percent), 9 percent cellulose, 9 percent acrylonitrilic latex resin binder, and l percent diphenylamine as a stabiliser.
  • the suspension is squeezedrained and is then introduced into a two-shell cylindrical mould (which has perforate walls) containing an axial metal rod to form an axial channel in the moulded article for the fuse.
  • work-up continues by heating the mould, the tubular member being brought to a final state of apparent density 0.6.
  • Typical dimensions of the tubular member are:
  • a 2mm diameter detonating fuse 2 is fitted into the axial channel.
  • This fuse comprises a cylindrical lead sheath, /zmm thick, surrounding a charge of equal quantities of Penthrite and calcium silicide.
  • the tubular member 1 and fuse 2 are then mounted on the base member 3 and are intro Jerusalem axially into a cartridge case.
  • the resultant charge satisfies the satutory rough-handling tests and gives improved firing results compared to a conventional primer tube; it gives less variation in the initial projectile speed with a reduced maximum pressure and with a constant initial velocity.
  • the rigid combustible substance was moulded to form a tubular member along whose axis the detonating fuse in disposed; clearly, however, the rigid combustible substance is not limited to such a shape and can be worked into any other required shape.
  • the invention provides a more uniform velocity and pressure and a lower pressure than has previously been obtained.
  • the device is well suited for high-performance equipment, especially for semi-combustible cartridge cases where the presence of an empty metal priming tube in the cartridge after ignition is undesirable.
  • the combustible material used for this invention is relatively safe to handle during the manufacture of the device as the presence of water or resin binder and stabiliser reduces the danger of sudden explosion.
  • Table I lists other examples or rigid combustible substances which may be used according to the invention.
  • the results of comparative testing against conventional devices are given in Table II.
  • the rigid combustible material comprises one or more felt members having from 70 to 90 percent of nitrocellulose with a nitrogen content of 12.6 to 14.1 percent as the fuel element of high burning velocity, and from to percent of cellulose with a resin binder and a stabiliser as the fuel elements of low burning velocity TABLEI Composition Nitrocellulose Cellulose Resin Stabiliser Metal No.
  • An ignition device which comprises a low-energy energy detonating fuse, a casing about said detonating fuse, said casing consisting of a substantially rigid tubular body of a rigid combustible material of high burning velocity, said body of combustible material surrounding said detonating fuse such that said combustible material forms the sole encasement for said detonating fuse, said tubular body being self-supporting and being adapted to be disposed within a cartridge case or missile in direct contact with an explosive charge to be ignited, a base member fixedly engaged with said body, and priming means disposed within said base member in contact with said fuse.
  • An ignition device in which the rigid combustible material comprises on the one imparting mechanical strength to the body.
  • a device in which said resin binder is selected from the group consisting of acrylic, polyvinyl, acrylonitrile, methylolated urea-formol, formol-melamine, nitrocellulose and polyvinyl nitrate resins, and is present in an amount from 5 to 15 percent by weight.
  • a device in which said stabiliser is selected from the group consisting of diphenylamine, Centralite and nitrodiphenylamine.
  • tubular body comprises, by weight, 81 percent nitrocellulose having a nitrogen content of 13.35 percent, 9 percent cellulose. 9 percent of an acrylonitrilic latex resin binder and 1 percent diphenylamine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US822413A 1968-05-17 1969-05-07 Ignition device for explosive charges Expired - Lifetime US3899973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR152244 1968-05-17

Publications (1)

Publication Number Publication Date
US3899973A true US3899973A (en) 1975-08-19

Family

ID=8650406

Family Applications (1)

Application Number Title Priority Date Filing Date
US822413A Expired - Lifetime US3899973A (en) 1968-05-17 1969-05-07 Ignition device for explosive charges

Country Status (10)

Country Link
US (1) US3899973A (enExample)
BE (1) BE731847A (enExample)
CH (1) CH506044A (enExample)
ES (1) ES166433Y (enExample)
FR (1) FR1593513A (enExample)
GB (1) GB1270298A (enExample)
IL (1) IL32160A (enExample)
LU (1) LU58536A1 (enExample)
NL (1) NL163868C (enExample)
SE (1) SE407977B (enExample)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674405A (en) * 1985-01-23 1987-06-23 Dynamit Nobel Aktiengesellschaft Partially combustible propellant charge igniter
US4882994A (en) * 1988-01-28 1989-11-28 Veltman Preston Leonard Particulate fuel components for solid propellant systems
US5052302A (en) * 1990-07-26 1991-10-01 Olin Corporation Unpressurized combustible primer for cannon cartridges
WO1996011374A1 (en) * 1994-10-06 1996-04-18 Ici Australia Operations Proprietary Limited Explosives booster and primer
US5743559A (en) * 1994-01-27 1998-04-28 Daicel Chemical Industries, Ltd. Inflator for air bags
US6170399B1 (en) 1997-08-30 2001-01-09 Cordant Technologies Inc. Flares having igniters formed from extrudable igniter compositions
US6224099B1 (en) 1997-07-22 2001-05-01 Cordant Technologies Inc. Supplemental-restraint-system gas generating device with water-soluble polymeric binder
US6315847B1 (en) 1999-01-29 2001-11-13 Cordant Technologies Inc. Water-free preparation of igniter granules for waterless extrusion processes
KR20020057578A (ko) * 2001-01-02 2002-07-12 송재인 이산화탄소 카트리지 파열장치
US6474239B2 (en) * 1999-12-08 2002-11-05 Giat Industries Igniter tube for artillery ammunition
US6860208B2 (en) * 2001-01-04 2005-03-01 Trw Inc. Nitrocellulose gas generating material for a vehicle occupant protection apparatus
WO2005026081A1 (en) * 2003-09-04 2005-03-24 Autoliv Asp, Inc. Low density slurry bridge mix

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3249049A (en) * 1964-07-31 1966-05-03 Zimmerman Theodore Ballistic primer
US3264993A (en) * 1965-04-22 1966-08-09 Atlantic Res Corp Combustible cartridge case composition and process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3249049A (en) * 1964-07-31 1966-05-03 Zimmerman Theodore Ballistic primer
US3264993A (en) * 1965-04-22 1966-08-09 Atlantic Res Corp Combustible cartridge case composition and process

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674405A (en) * 1985-01-23 1987-06-23 Dynamit Nobel Aktiengesellschaft Partially combustible propellant charge igniter
US4882994A (en) * 1988-01-28 1989-11-28 Veltman Preston Leonard Particulate fuel components for solid propellant systems
US5052302A (en) * 1990-07-26 1991-10-01 Olin Corporation Unpressurized combustible primer for cannon cartridges
WO1992001903A1 (en) * 1990-07-26 1992-02-06 Olin Corporation Unpressurized combustible primer for cannon cartridges
US5743559A (en) * 1994-01-27 1998-04-28 Daicel Chemical Industries, Ltd. Inflator for air bags
WO1996011374A1 (en) * 1994-10-06 1996-04-18 Ici Australia Operations Proprietary Limited Explosives booster and primer
US6112666A (en) * 1994-10-06 2000-09-05 Orica Explosives Technology Pty. Ltd. Explosives booster and primer
US6224099B1 (en) 1997-07-22 2001-05-01 Cordant Technologies Inc. Supplemental-restraint-system gas generating device with water-soluble polymeric binder
US6170399B1 (en) 1997-08-30 2001-01-09 Cordant Technologies Inc. Flares having igniters formed from extrudable igniter compositions
US6315847B1 (en) 1999-01-29 2001-11-13 Cordant Technologies Inc. Water-free preparation of igniter granules for waterless extrusion processes
US6474239B2 (en) * 1999-12-08 2002-11-05 Giat Industries Igniter tube for artillery ammunition
KR20020057578A (ko) * 2001-01-02 2002-07-12 송재인 이산화탄소 카트리지 파열장치
US6860208B2 (en) * 2001-01-04 2005-03-01 Trw Inc. Nitrocellulose gas generating material for a vehicle occupant protection apparatus
WO2005026081A1 (en) * 2003-09-04 2005-03-24 Autoliv Asp, Inc. Low density slurry bridge mix
US20050067071A1 (en) * 2003-09-04 2005-03-31 Hamilton Brian K. Low density slurry bridge mix
US6905562B2 (en) * 2003-09-04 2005-06-14 Autoliv Asp, Inc. Low density slurry bridge mix
CN100379708C (zh) * 2003-09-04 2008-04-09 奥托里夫Asp股份有限公司 低密度浆料桥混合物

Also Published As

Publication number Publication date
LU58536A1 (enExample) 1969-07-29
NL163868C (nl) 1980-10-15
SE407977B (sv) 1979-04-30
ES166433U (es) 1971-08-01
BE731847A (enExample) 1969-10-01
IL32160A0 (en) 1970-11-30
ES166433Y (es) 1972-01-01
DE1924627A1 (de) 1969-12-11
FR1593513A (enExample) 1970-06-01
NL163868B (nl) 1980-05-16
GB1270298A (en) 1972-04-12
NL6907406A (enExample) 1969-11-19
CH506044A (fr) 1971-04-15
DE1924627B2 (de) 1976-11-11
IL32160A (en) 1973-08-29

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