EP0189627A2 - Charge pyrotechnique à lancement, allumée électriquement - Google Patents

Charge pyrotechnique à lancement, allumée électriquement Download PDF

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Publication number
EP0189627A2
EP0189627A2 EP85305729A EP85305729A EP0189627A2 EP 0189627 A2 EP0189627 A2 EP 0189627A2 EP 85305729 A EP85305729 A EP 85305729A EP 85305729 A EP85305729 A EP 85305729A EP 0189627 A2 EP0189627 A2 EP 0189627A2
Authority
EP
European Patent Office
Prior art keywords
grenade
pyrotechnic
charge
squib
electric
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.)
Withdrawn
Application number
EP85305729A
Other languages
German (de)
English (en)
Other versions
EP0189627A3 (fr
Inventor
Avishay Yaniv
Matityahu Peretz
Levi Sagiv
Yitschak Harel
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.)
Israel Military Industries Ltd
State of Israel
Original Assignee
Israel Military Industries Ltd
State of Israel
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Israel Military Industries Ltd, State of Israel filed Critical Israel Military Industries Ltd
Publication of EP0189627A2 publication Critical patent/EP0189627A2/fr
Publication of EP0189627A3 publication Critical patent/EP0189627A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B4/00—Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/58—Electric firing mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/46—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing gases, vapours, powders or chemically-reactive substances
    • F42B12/48—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing gases, vapours, powders or chemically-reactive substances smoke-producing, e.g. infrared clouds
    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means

Definitions

  • the present invention relates to an improved pyrotechnical grenade and has for its object to provide such a grenade that combines storage safety with reliable operation.
  • smokescreen grenades smokescreen being one of various conceivable pyrotechnical effects that can be achieved in accordance with the present invention. It should, however, be understood that the invention is not limited thereto, examples of other pyrotechnical effects that can be achieved in accordance with the present invention being pyrotechnical illumination, riot control and the like.
  • the modern battlefield environment is rapidly becoming highly saturated with portable weapons such as shoulder-fired missiles and rockets which can be deployed by individuals against armoured vehicles such as battle tanks and personnel carriers.
  • a known countermeasure to these various threats is use of smokescreen to reduce the visibility and allow a period in which an armoured vehicle can move unobserved into a new combat position.
  • a smokescreen grenade For a smokescreen grenade to fulfill its purpose it has to combine safety means to avoid unintentional ignition during storage with an ignition mechanism that responds reliably to intentional ignition. Also the spreading of the smokescreen at the target area should proceed with the utmost speed and it is the object of the present invention to provide a pyrotechnic grenade that meets these requirements.
  • a pyrotechnic grenade adapted to be launched from a launching tube by electric actuation, comprising a charge of pyrotechnic material, an ignitable charge adapted upon ignition to ignite the pyrotechnic material and to disperse a combustion product thereof (disperser charge), a propellant charge adapted to eject the grenade from the launching tube and an electric squib having two electric terminals and adapted to ignite said disperser and propellant charges, characterized in that means are provided by which said terminals are short-circuited in the unloaded state of the grenade (short-circuiting means), which short-circuiting means are adapted for cooperation with an electric terminal in said launching tube such that upon loading the grenade into the launching tube the short- circuit is opened.
  • said squib is enclosed within a metal casing which forms one terminal thereof while a second terminal protrudes therefrom in isolation from the casing, the squib being mounted within a metal base member of the grenade, and said short-circuiting means are adapted to establish in the unloaded state of the grenade electric contact between said second terminal and said metal base.
  • a Faraday Cage adapted to shield off said squib against stray pulses resulting from radio frequency interference (RFI).
  • the disperser charge is located within an axial, perforated tube (burster tube). It has been found in accordance with the invention that such a burster tube ensures immediate ignition of the pyrotechnic charge and a practically instantaneous dispersion of the combustion product thereof.
  • the pyrotechnic grenade comprises a pyrotechnic delay unit whereby the disperser charge is ignited only when the grenade has moved a predetermined distance out of the launcher tube.
  • a smokescreen grenade - comprises a cylindrical body 2 made predominantly of non-metallic material such as cardboard or plastic material and fitted at its front with an end plate 3 and at its rear a terminal metal member 4 with an integral cup-shaped extension 5 having screwed thereon a metal cap 6 serving as Faraday Cage as will be explained below.
  • an electric squib 7 comprising a metal casing 8 serving as a first electric terminal and a centrally located, protruding second terminal 9 which is electrically insulated from casing 8. Squib 7 is inserted into the accommodating recess in a tight fit so that electric current can flow between casing 8 and terminal member 4.
  • cup-shaped extension 5 there is mounted a cup-shaped insulator member 10, extension 5 and insulator 10 having registering central bores accommodating between them a spring loaded metal pin 11 retained by means of head 12 at the rear side of a metal plate 13.
  • Faraday Cage 6 and insulator member 10 define between them an inner space 14 which accommodates a spring loaded contactor assembly comprising a metal plate 15, a metal spring 16 and metal plate 13.
  • Cap 6 comprises a central hole 17 lined with an insulator ring 18.
  • the grenade 1 Adjacent the terminal member 4 the grenade 1 comprises a compartment 20 containing a propellant charge 21. On its rear side the terminal member 4 comprises a plurality of ports 22 arranged in a circular pattern and serving for the discharge of propulsion gases for the ejection of the grenade from the launcher tube as will be explained further below.
  • burster tube 23 Centrally located within the cylindrical body 2 of grenade 1 is a perforated burster tube 23 having a plurality of perforations 24.
  • the interior of burster tube 23 is packed with a disperser charge 25 while the space inside body 2 surrounding burster tube 23 is packed with the main pyrotechnic charge 26.
  • a pyrotechnic delay unit 27 of a kind known per se which is so designed that it is ignited by the squib only after the grenade has travelled a predetermined distance out of the launcher tube.
  • End plate 3 is fitted with a ring 28 serving as handle, e.g. when the grenade is lowered into a launcher tube.
  • ignition unit 30 In the now following description the assembly of cup-shaped extension 5, Faraday Cage 6 with all the operative members they contain and squib 7 will be referred to collectively as ignition unit 30.
  • ignition unit 30 is adapted for cooperation with a pin-shaped terminal 31 forming part of a launcher tube 32.
  • Launcher tube 32 may be part of a cluster of tubes combined in form of a casette (not shown).
  • metal plate 15 bears against the end wall of Faraday Cage 6 bridging the hole 17 thereof while at the same time the tip of the spring loaded pin 11 bears on the second terminal 9 of squib 7 while its head 12 bears on metal plate 13 which latter is in electric contact with metal plate 15 through the intermediary of the metal spring 16.
  • terminal 9 of squib 7 is in electric contact with Faraday Cage 6 which latter in turn is in electric contact with the cup-shaped metal extension 5 of terminal member 4 which in turn is in electric contact with metal body 8 of squib 7.
  • Block 33 is associated with metal contact fingers 34 supported by launcher tube 32 and adapted to hold the grenade 1 in position in the manner shown in Fig. 4.
  • Terminal 31 is connected to one pole of an .pa electric circuit while the body of the metal launcher tube 32 is connected to the other pole, an insulator ring 35 insulating terminal 31 from the body of the launcher tube. The body of the launcher tube and fingers 34 thus form the second electric terminal.
  • a sealed space is formed between the terminal member 4 and launcher tube 32. Consequently, upon ignition of the propellant charge 20 propellant gases burst out of ports 22 and a pressure builds up within said sealed space as a result of which the grenade 1 is ejected from the launcher tube.
  • the pyrotechnic delay unit 27 ignites disperser charge 25 which in turn ignites the pyrotechnic charge 26.
  • the entire pyrotechnic charge is ignited nearly simultaneously whereby the non-metallic portion of body 2 is burst and the combustion product resulting from the ignition of the pyrotechnic charge is dispersed practically instantaneously.
  • tube 32 forms part of a cluster of launcher tubes a plurality of pyrotechnic grenades may be fired sequentially or simultaneously, as may be required.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Bags (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP85305729A 1985-01-29 1985-08-13 Charge pyrotechnique à lancement, allumée électriquement Withdrawn EP0189627A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL74188 1985-01-29
IL74188A IL74188A0 (en) 1985-01-29 1985-01-29 Pyrotechnic grenade

Publications (2)

Publication Number Publication Date
EP0189627A2 true EP0189627A2 (fr) 1986-08-06
EP0189627A3 EP0189627A3 (fr) 1987-05-27

Family

ID=11055639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85305729A Withdrawn EP0189627A3 (fr) 1985-01-29 1985-08-13 Charge pyrotechnique à lancement, allumée électriquement

Country Status (7)

Country Link
EP (1) EP0189627A3 (fr)
KR (1) KR940000765B1 (fr)
ES (1) ES8701973A1 (fr)
GR (1) GR851984B (fr)
IL (1) IL74188A0 (fr)
NO (1) NO853202L (fr)
PT (1) PT81016B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2083902A2 (es) * 1992-05-08 1996-04-16 Hughes Aircraft Comapany Conectador de seguridad frente a descargas electrostaticas para dispositivos electroexplosivos.
FR2847666A1 (fr) * 2002-11-25 2004-05-28 Lacroix Soc E Munition perfectionnee
EP3407438A1 (fr) * 2017-05-22 2018-11-28 MBDA Deutschland GmbH Système de connecteur enfichable destiné au contact protégé contre l'allumage, protégé électriquement avec une perle d'allumage
US11692798B2 (en) 2021-12-07 2023-07-04 Southwest Research Institute Electrical igniter assembly for incendiary and explosive devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957415A (en) * 1955-11-10 1960-10-25 Montedison Spa Safety device for electric primers for mines, to protect against ignition by stray electric currents
DE2633590C2 (de) * 1976-07-27 1984-09-27 Daimler-Benz Ag, 7000 Stuttgart Zündvorrichtung für ein passives Rückhaltesystem
US4436034A (en) * 1981-05-05 1984-03-13 A/S Raufoss Ammunisjonsfabrikker Smoke grenade with successive slow and fast burning charges

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2083902A2 (es) * 1992-05-08 1996-04-16 Hughes Aircraft Comapany Conectador de seguridad frente a descargas electrostaticas para dispositivos electroexplosivos.
FR2847666A1 (fr) * 2002-11-25 2004-05-28 Lacroix Soc E Munition perfectionnee
EP3407438A1 (fr) * 2017-05-22 2018-11-28 MBDA Deutschland GmbH Système de connecteur enfichable destiné au contact protégé contre l'allumage, protégé électriquement avec une perle d'allumage
US11692798B2 (en) 2021-12-07 2023-07-04 Southwest Research Institute Electrical igniter assembly for incendiary and explosive devices

Also Published As

Publication number Publication date
EP0189627A3 (fr) 1987-05-27
PT81016A (en) 1985-09-01
ES8701973A1 (es) 1986-12-16
GR851984B (fr) 1985-11-26
IL74188A0 (en) 1985-04-30
KR860006030A (ko) 1986-08-16
ES546327A0 (es) 1986-12-16
KR940000765B1 (ko) 1994-01-29
PT81016B (pt) 1987-08-19
NO853202L (no) 1986-07-30

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Inventor name: PERETZ, MATITYAHU