EP0064444B1 - Eclairant pyrotechnique de grande puissance - Google Patents

Eclairant pyrotechnique de grande puissance Download PDF

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Publication number
EP0064444B1
EP0064444B1 EP82400716A EP82400716A EP0064444B1 EP 0064444 B1 EP0064444 B1 EP 0064444B1 EP 82400716 A EP82400716 A EP 82400716A EP 82400716 A EP82400716 A EP 82400716A EP 0064444 B1 EP0064444 B1 EP 0064444B1
Authority
EP
European Patent Office
Prior art keywords
composition
support structure
flare
pyrotechnic
initiator
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
Application number
EP82400716A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0064444A1 (fr
Inventor
Alain Billard
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.)
Etienne LaCroix Tous Artifices SA
Original Assignee
Etienne LaCroix Tous Artifices SA
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 Etienne LaCroix Tous Artifices SA filed Critical Etienne LaCroix Tous Artifices SA
Publication of EP0064444A1 publication Critical patent/EP0064444A1/fr
Application granted granted Critical
Publication of EP0064444B1 publication Critical patent/EP0064444B1/fr
Expired 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
    • F42B4/26—Flares; Torches

Definitions

  • the invention relates to pyrotechnic illuminants.
  • the present invention provides a simple and effective solution to this problem.
  • Such a combination is known in itself from FR-E 21 603, which further teaches mounting of the second delay pyrotechnic composition in an area located at the other end of the support structure.
  • the pyrotechnic illuminant according to the invention is characterized in that the support structure comprises, from its end on the initiator side, radial through orifices distributed over its length, in that the second delay pyrotechnic composition is housed in said through orifices, and in that the length of these orifices decreases according to a substantially linear function of their distance from the initiator, the ratio of the decrease in the length of the orifices at a distance from the initiator and the ratio of the linear delays of the two delay pyrotechnic compositions being chosen so that the fire emerges practically at the same time outside the through orifices.
  • the second delay pyrotechnic composition has a linear speed of fire propagation about 10 to 20 times lower than that of the first delay pyrotechnic composition.
  • the through orifices are established in ribs integral with the hollow tubular core of the support structure.
  • the internal cross section of the support structure gradually widens from the initiator.
  • the thickness of the lining of the illuminating composition is substantially constant along the support structure.
  • the distance between two adjacent through-holes, along the support structure be of the same order as the radial thickness of the lighting composition in line with a through-hole.
  • the lining of the illuminating composition is established in a substantially isometric manner from each through orifice.
  • the entire lighting composition is enclosed in a flexible envelope, such as a bag.
  • the pyrotechnic light of the invention can be dropped, unloaded and / or propelled, for example from an aircraft. It will then serve to blind and / or damage the optical detection systems of an attacker.
  • the illuminating composition operates in the infrared and / or in the visible, preferably both.
  • the reference numeral 1 designates a support structure, of generally hollow tubular shape, which is advantageously made of rigid plastic. At one end of the support structure is arranged at least one initiator3; this can take many different embodiments, and is not illustrated in detail here.
  • a first delay pyrotechnic composition In the internal tubular core 10 of the carrying structure 1 is placed a first delay pyrotechnic composition, generally designated by the reference numeral 2. This delay composition 2 comes into contact with the initiator 3, so that it can be lit by it.
  • the internal tubular core 10 of the support structure is preferably of progressively increasing cross section as one moves away from the initiator 3.
  • this tubular core 10 has a very elongated truncated cone shape.
  • the support structure 1 is additionally provided with four ribs at right angles, designated by the reference 11 to 14. These ribs extend outward. From place to place, on the support structure, are formed in the ribs thereof, radial through holes; in Figure 2, we see four of the holes, namely the hole 113 in the rib 11, the hole 114 in the rib 12, the hole 115 in the rib 13, and finally the hole 116 in the rib
  • the length of these through orifices 101 to 151 decreases according to a substantially linear function of their axial distance from the initiator 3; and, in the through holes, is placed a second delay pyrotechnic composition, designated by the general reference 4.
  • the delay composition 2 is fast, while the delay composition 4 is slow.
  • Figure 3 schematically illustrates this, with regard to the orifices 101 to 113.
  • the distances between these orifices, taken on the axis of the support structure 1, are practically equal, and it can therefore be assumed that the delay in the pyrotechnic composition 2 s 'established at t o from one orifice to another.
  • the orifice 101 will therefore receive the fire with a delay t o relative to the excitation of the initiator 3; and the light will emerge from this orifice 101 at the end of a delay t 101 ′ linked to the nature of the second delay pyrotechnic composition, as well as to the length of this orifice 101.
  • the fire will emerge from orifice 101 at the end of a time equal to + tioi.
  • the second delay pyrotechnic composition 4 has a linear speed of fire propagation about 10 to 20 times higher than that of the first delay pyrotechnic composition 2.
  • This in practice allows a relatively easy construction taking into account the tolerances on delays. compositions and dimensions of the orifices, and this for a pyrotechnic illuminator of elongated structure.
  • Another aspect of the invention contributes to the instantaneous high power of the lighting: it is made so that the thickness of the lining of the lighting composition is substantially constant along the support structure 1, and that on the other hand the linings of illuminating composition 5 are established in a substantially isometric manner from each through orifice.
  • FIG. 2 this appears by the fact that the composition 5 is delimited by 4 arcs of a circle, which are each centered substantially at the exit point of the nearest through orifice.
  • arcs of a circle a roughly equivalent structure can be provided, for example a square cross section, the vertices of which would be aligned with the axes of the through orifices in FIG. 2.
  • the distance between two adjacent through holes, such as 101 and 105, taken along the support structure be of the same order as the radial thickness of the lighting composition 5 in line with a through hole.
  • the fire is then simultaneously set in sufficient place in the lighting composition 5 for the triggering thereof to be almost instantaneous on the whole of its length.
  • the entire lighting composition 5 is enclosed in a flexible envelope, such as a bag 6, which contributes to the good propagation of the information in the composition. illuminating, if that is still necessary.
  • the pyrotechnic composition 2 which will contribute to the axial propagation of the fire in the support structure 1, it is possible to take a propagation speed of approximately 2,000 meters per second, this speed possibly going up to 8,000 meters per second. As previously indicated, the propagation speed of the other composition will be 10 to 20 times lower than that of the first, preferably 14 to 15 times lower than the latter.
  • the lighting of the lighting pyrotechnic composition can then be obtained at the same time on the whole of the lighting, and this with a precision of the order of 10 ms.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP82400716A 1981-04-23 1982-04-21 Eclairant pyrotechnique de grande puissance Expired EP0064444B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8108106A FR2504670A1 (fr) 1981-04-23 1981-04-23 Eclairant pyrotechnique de grande puissance
FR8108106 1981-04-23

Publications (2)

Publication Number Publication Date
EP0064444A1 EP0064444A1 (fr) 1982-11-10
EP0064444B1 true EP0064444B1 (fr) 1985-06-26

Family

ID=9257701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400716A Expired EP0064444B1 (fr) 1981-04-23 1982-04-21 Eclairant pyrotechnique de grande puissance

Country Status (7)

Country Link
US (1) US4463679A (enExample)
EP (1) EP0064444B1 (enExample)
DE (1) DE3264405D1 (enExample)
DK (1) DK151518C (enExample)
ES (1) ES279685Y (enExample)
FR (1) FR2504670A1 (enExample)
NO (1) NO154936C (enExample)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2559255B1 (fr) * 1984-02-03 1987-07-24 Brandt Armements Allumeur et cartouche d'allumage pour charge propulsive de projectile
DE3432291A1 (de) * 1984-09-01 1986-03-13 Rheinmetall GmbH, 4000 Düsseldorf Treibladungsmodul
DE3515166A1 (de) * 1985-04-26 1986-10-30 Buck Chemisch-Technische Werke GmbH & Co, 7347 Bad Überkingen Wurfkoerper zur darstellung eines infrarot-flaechenstrahlers
US5074216A (en) * 1987-09-03 1991-12-24 Loral Corporation Infrared signature enhancement decoy
GB9120801D0 (en) * 1991-10-01 1995-03-08 Secr Defence Propelled pyrotechnic decoy flare
US5565645A (en) * 1995-04-24 1996-10-15 Thiokol Corporation High-intensity infrared decoy flare
US5866840A (en) * 1997-09-17 1999-02-02 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Nozzles for pyrophoric IR decoy flares
US20170323240A1 (en) 2016-05-06 2017-11-09 General Electric Company Computing system to control the use of physical state attainment with inspection

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191517802A (en) * 1915-12-20 1916-12-20 Samuel Cleland Davidson Improvements in or relating to Explosive Shells.
US1847268A (en) * 1931-03-31 1932-03-01 George J Schladt Pyrotechnic device
US3494283A (en) * 1966-12-27 1970-02-10 Us Air Force Cavity flare
US3670657A (en) * 1970-04-30 1972-06-20 Us Navy Signal flare
US3970003A (en) * 1974-10-16 1976-07-20 Avco Corporation Pyrophoric flare

Also Published As

Publication number Publication date
ES279685Y (es) 1985-09-01
US4463679A (en) 1984-08-07
NO821256L (no) 1982-10-25
EP0064444A1 (fr) 1982-11-10
ES279685U (es) 1985-02-16
DK151518B (da) 1987-12-07
NO154936B (no) 1986-10-06
DK151518C (da) 1988-07-04
DE3264405D1 (en) 1985-08-01
FR2504670A1 (fr) 1982-10-29
DK180382A (da) 1982-10-24
NO154936C (no) 1987-01-14
FR2504670B1 (enExample) 1983-07-29

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