Classifications

• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
  • C06C15/00—Pyrophoric compositions; Flints
• • 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
  • F42B4/06—Aerial display rockets

Definitions

• the present invention relates to pyrotechnic projectiles intended to obtain figures, letters or any pattern in the sky by pyrotechnic means.
• pyrotechnics intended to obtain figures, letters or any pattern in the sky by pyrotechnic means.
• bombs that represent patterns.
• the method used to make these patterns is to arrange stars in a bomb body in the same arrangement as the pattern itself.
• stars are agglomerates made from a pyrotechnic composition which burns with a flame color characteristic of the formulation used.
• the stars are lit and dispersed in one atmosphere and will represent the desired pattern by several light points, each point being made by a star.
• the invention aims to remedy the drawbacks of the known technique by creating a pyrotechnic projectile which is capable of producing in the sky a continuous contour pattern which is visible for a time long enough to be observed by spectators.
• a pyrotechnic projectile comprising a body containing a burst charge and a combustible charge, the ignition and dispersion of which are ensured by the explosion of the burst charge, characterized in that the combustible charge is formed by a combustible metallic powder with oxygen from the air, disposed within the burst charge according to a pattern corresponding to the shape of the firework motif to be obtained in the sky.
• Fig.l is a perspective view with partial cutaway of the projectile pyrotechnics according to the invention
• Fig.2 is an axial sectional view of the pyrotechnic projectile of Figure 1;
• - Fig.3 is a sectional view on a larger scale along line 3-3 of Figure 2, showing a combustible charge formed of agglomerated powder metal placed in the burst charge and constituting the replica of the pattern to be obtained in the sky;
• - Fig.4 is a sectional view similar to that of Figure 3, showing a combustible charge formed of agglomerated metal particles intended to obtain another pattern in the sky.
• a body 1 of plastic comprising a head 2 and with which is associated a skirt 3 forming a tail.
• a bursting charge 4 consisting for example of black powder, within which is disposed a combustible charge 5 which, in the present example is formed of metal particles such as titanium agglomerated.
• the block 5 of agglomerated metal particles has a shape corresponding to the shape of the firework pattern to be obtained in the sky. In this case, it is the stylized form of the number 2.
• the metal powder used is sponge titanium powder whose particle size is greater than 500 ⁇ .
• the metal particles instead of being agglomerated, can be placed within the bursting charge in the form of divided powder, forming the replica of the pattern to be obtained in the sky.
• the number of particles present in 1 gram of powder of metallic particles used is several thousand particles.
• the body 1 is closed by a cover 6 on which is mounted a container 7 of frustoconical shape and which defines the head of the projectile.
• the cover 6 forms the base of the container 7.
• a mass 8 of high density metal powder for example iron powder, intended to make the head of the projectile heavier and to shift its center of gravity towards the front.
• the body 1 comprises an axial tubular sleeve 9, integrally with its bottom 10 and in which is disposed a pyrotechnic retardation composition 11.
• the sleeve 9 opens out at the center of the skirt 3 forming a tail unit.
• elongated openings 12 for maintaining the trajectory of the projectile after its launch.
• the tubular body 1, the skirt 3, the cover 6 of the body 1 and the container 7 forming the nose of the projectile are made of plastic material, for example made of polystyrene and fixed together by gluing.
• the skirt 3 is made so as to have sufficient strength not to be destroyed by the projectile launcher, but fragile enough to be reduced, like the rest of the projectile envelope, into small pieces at the time of the explosion of the machine.
• the bursting charge 4 has three functions, it causes the explosion of the machine, and disperses the titanium particles from the combustible charge 5. In addition, it maintains the pattern represented by the illuminating charge in position in the body 1.
• the pyrotechnic delay is a delay of 1 order of 2 seconds which is ignited at the start of the projectile and which transmits fire inside the body 1 of the latter when it reaches the point of its trajectory at which its bursting must have location.
• the dispersion of the titanium particles of the fuel charge makes it possible to obtain in the sky, the firework motif of which the agglomerated block of the titanium particles contained in the pyrotechnic projectile is the exact replica.
• the large number of compressed particles in the agglomerated block ensures obtaining in the sky a contour pattern having for the spectator a continuous aspect.
• the pattern represented by the agglomerated block 5 is a stylized 2.
• FIG. 4 which is a section through the pyrotechnic projectile according to the invention similar to that of FIG. 3, but in which the agglomerated block is constituted by a circle 5a, this circle, after explosion of the pyrotechnic projectile which contains it, allows to get in the air, a circle of corresponding shape.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Crystallography & Structural Chemistry (AREA)
• Metallurgy (AREA)
• Emergency Lowering Means (AREA)
• Air Bags (AREA)
• Powder Metallurgy (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9508023

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (18)

• 1997
  • 1997-06-16 FR FR9707442A patent/FR2764687B1/fr not_active Expired - Fee Related
• 1998
  • 1998-06-16 EP EP98930855A patent/EP0988502B1/de not_active Expired - Lifetime
  • 1998-06-16 AU AU81144/98A patent/AU8114498A/en not_active Abandoned
  • 1998-06-16 CA CA002294825A patent/CA2294825C/fr not_active Expired - Fee Related
  • 1998-06-16 ES ES98930855T patent/ES2189191T3/es not_active Expired - Lifetime
  • 1998-06-16 WO PCT/FR1998/001261 patent/WO1998058225A1/fr active IP Right Grant
  • 1998-06-16 US US09/445,848 patent/US6324981B1/en not_active Expired - Lifetime

Non-Patent Citations (1)

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