EP3828491B1 - Dispositif pyrotechnique à plusieurs étages doté d'un séparateur d'étage en carton - Google Patents

Dispositif pyrotechnique à plusieurs étages doté d'un séparateur d'étage en carton Download PDF

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Publication number
EP3828491B1
EP3828491B1 EP20206850.8A EP20206850A EP3828491B1 EP 3828491 B1 EP3828491 B1 EP 3828491B1 EP 20206850 A EP20206850 A EP 20206850A EP 3828491 B1 EP3828491 B1 EP 3828491B1
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EP
European Patent Office
Prior art keywords
pyrotechnic
separator
disposed
stage
thin
Prior art date
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Application number
EP20206850.8A
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German (de)
English (en)
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EP3828491A1 (fr
Inventor
Fausto ONORI
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Onfa Srl
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Onfa Srl
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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
    • F42B4/24—Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes characterised by having plural successively-ignited charges
    • 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
    • F42B4/02—Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes in cartridge form, i.e. shell, propellant and primer

Definitions

  • the present patent application for industrial invention relates to a multistage pyrotechnic device with a cardboard stage separator.
  • JP S52 123574 U discloses a known multistage pyrotechnic device comprising separators between the stages made from plastic or felt and comprising an axial conduit.
  • tubular pyrotechnic device (200) of Fig. 1 is commonly defined as "Roman candle”.
  • Such a tubular multistage pyrotechnic device (200) comprises a launching tube (DD) provided with a bottom opening firmly closed by a cap (T) and an upper opening where a lid (N) is usually disposed.
  • DD launching tube
  • T cap
  • N lid
  • the pyrotechnic device (200) comprises a plurality of pyrotechnic stages (ST) sequentially disposed in the launching tube (DD) in such a way that an upper pyrotechnic stage (ST) is disposed in the vicinity of the upper opening of the launching tube (DD), and a plurality of lower pyrotechnic stages (ST) sequentially disposed towards the bottom opening.
  • each pyrotechnic stage comprises a launching charge (C) and effect means (M).
  • the pyrotechnic device (200) also comprises a separator (8) disposed between two consecutive pyrotechnic stages (ST).
  • a separator (8) disposed between two consecutive pyrotechnic stages (ST).
  • the pyrotechnic device (200) also comprises an upper separator (8) above the upper pyrotechnic stage (ST).
  • a launching charge (C), effect means (M) and a separator (8) are continuously and sequentially alternated along the entire launching tube (DD).
  • the effect means (M) can generate a "comet effect”, namely an ascending trail of light, or a “fountain effect”, namely a rain of pyrotechnic fire in the upper dead point of said ascending trail of light.
  • Each separator (8) acts as an insulating fireproof element between the pyrotechnic stages (ST) of the sequence, and as a retardant for the triggering of the launching charge (C) of the pyrotechnic stage (ST) disposed in immediately lower position, in such a way that the various stages are launched in the desired sequence.
  • said separators (8) comprise a felt cylindrical body (81) with a plastic bushing (80) in central position, and a fuse (U) in the axial conduit (80a) of the plastic bushing (80).
  • fuse (U) means one or more inflammable cords or black retardant powder.
  • the separators (9) consist in an annular cylindrical tub with a low conicity degree.
  • Said annular cylindrical tub comprises an annular chamber defined by an external cylindrical wall (91), an internal cylindrical wall (90) and a bottom wall (92).
  • the internal cylindrical wall (90) internally defines a conduit (90a) where the fuse (U) is suitable for being disposed.
  • the annular chamber houses the launching charge (C) of the pyrotechnic stage (ST) disposed in immediately upper position, whereas said conduit (90a) houses the fuse (U) suitable for triggering the launching charge (C) of the pyrotechnic stage (ST) in immediately lower position with the desired delay.
  • the external diameter (D8, D9) of the two aforementioned types of separators (8, 9) is slightly higher than the internal diameter of the launching tube (DD), in such a way that the lateral wall of the felt body or of the annular chamber adheres to the internal surface of the launching tube (DD) and prevents the flame front produced in the launching chamber (C) of a pyrotechnic stage (ST) from escaping and propagating downwards and through the lateral wall, ultimately triggering the launching charge (C) of the pyrotechnic stage (ST) in lower position and eliminating the action of the fuse (U).
  • a central hole which is technically defined as "quick match" is generally provided on the lid (N) for inserting the fuse (U) that descends in the conduit (80a, 90a) of the separator (8, 9) in upper position, in such a way to trigger the launching charge (C) and consequently launch the effect means (M) of the pyrotechnic stage (ST) in upper position.
  • the flame front propagates slowly from said launching charge (C) inside the conduit (80a, 90a) of the separator (8, 9) in immediately lower position until the flame front triggers the launching charge (C) of the successive pyrotechnic stage. Also in this case, the launching charge (C) explodes and launches the effect means (M) and the separator (8, 9) of the pyrotechnic stage (ST) in lower position out of the launching tube (DD).
  • the first type of separators comprises a felt body with a plastic bushing
  • the second type of separators comprises a plastic annular tub
  • the purpose of the present invention is to overcome the drawbacks of the prior art by disclosing a pyrotechnic device with a low environmental impact.
  • the pyrotechnic device according to the invention is defined by claim 1.
  • a pyrotechnic device according to the invention is disclosed, which is generally indicated with reference numeral (100).
  • the pyrotechnic device (100) comprises a plurality of pyrotechnic stages (ST), just like the ones of the type described in the prior art, namely an upper pyrotechnic stage (ST) and a plurality of lower pyrotechnic stages (ST) sequentially disposed one on top of the other.
  • ST pyrotechnic stages
  • the pyrotechnic device (100) comprises an innovative separator (1) disposed between two consecutive pyrotechnic stages (ST).
  • the pyrotechnic device (100) also comprises a separator (1) in the vicinity of the upper opening and immediately above the upper pyrotechnic stage (ST).
  • each separator (1) of the pyrotechnic device (100) according to the invention comprises a multilayer structure composed of:
  • the separator (1) comprises two thin end disks (11, 12), three spacing rings (2) and two thin intermediate disks (13).
  • separator (1) of the embodiment shown in Figs. 4, 5 and 6 comprises three spacing rings (2) and two thin intermediate disks (13), the purposes of the present invention are achieved also when the separator (1) is exclusively formed of one spacing ring (2) disposed between the two thin end disks (11, 12).
  • the diameter (d2) of the spacing rings (2) made of cardboard is lower than the diameter of the thin disks (11, 12, 13).
  • a perimeter portion (5) of the thin disks (11, 12, 13) shaped like an annular crown protrudes with respect to the spacing rings (2).
  • the internal diameter (d3) of the launching tube (DD) is higher than the diameter (d2) of the spacing ring (2) and is lower than the diameter (d1) of the thin end disks (11, 12).
  • the edge of said protruding perimeter portion (5) is suitable for adhering and sliding on the internal surface of the launching tube (DD) of the pyrotechnic device (100) wherein the separator (1) is inserted.
  • the spacing rings (2) and the thin disks (11, 12, 13) have a hole with the same diameter.
  • an axial conduit (10) is formed in the center of the separator (1) according to the invention when the spacing rings (2) and the thin disks (11, 12, 13) are assembled.
  • the inflammable cords are inserted in the axial conduit (10) of the separator (1) in upper position.
  • the black retardant powder is contained in the axial conduit of the separators (1) in lower position.
  • the separator (1) conveys the flame front of a launching charge (C) inside the axial conduit (10), where the fuse (U) propagates said flame front towards the pyrotechnic stage (ST) in lower position with the desired delay.
  • the launching tube (DD) has a circular section, just like the spacing rings (2) and the thin disks (11, 12, 13).
  • the diameter (d2) of the spacing rings (2) is slightly lower than the diameter (d1) of the thin disks (11, 12, 13) that in turn have a higher diameter (d1) than the internal diameter (d3) of the launching tube (DD) in such a way that said separators (1) create some friction during the insertion in the launching tube (DD).
  • said perimeter portion (5) is slightly bent in such a way to allow for said insertion with friction. The same occurs during the step of launching, when the separator (1) is ejected together with the effect means (M).
  • the ratio between the diameter (d2) of the spacing rings (2) and the diameter (d1) of the thin disks (11, 12, 13) ranges from 0.7 to 0.9, preferably 0.8.
  • the width of the perimeter portion (5) of the thin disks (11, 12, 13) ranges from 1 mm to 5 mm, preferably 3 mm.
  • each thin disk (11, 12, 13) ranges from 1 mm to 2 mm, whereas the thickness of said spacing rings (2) ranges from 6 mm to 8 mm.
  • the pyrotechnic device (100) may comprise only one lower pyrotechnic stage (ST) in lower position with only one separator (1) disposed between the lower pyrotechnic stage (ST) and the upper pyrotechnic stage (ST).
  • the separator (1) in case of disposal in the environment, the separator (1) does not have a negative environmental impact because the cardboard degrades and decomposes quickly because of weather agents, and therefore the cleaning operation of the area with the residues of said separators (1) may be omitted.
  • the separator (1) can play a central role in the field of pyrotechnics, replacing the separators (8, 9) of the prior art that are currently available on the market.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Buffer Packaging (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Claims (8)

  1. Dispositif pyrotechnique (100) à plusieurs étages comprenant :
    - un tube de lancement (DD) ayant une embouchure de base, une embouchure supérieure et un diamètre interne (d3) ;
    - un bouchon (T) qui ferme ladite embouchure de base du tube de lancement (DD) ;
    - un étage pyrotechnique (ST) supérieur disposé à l'intérieur du tube de lancement (DD) à proximité de l'embouchure supérieure et au moins un étage pyrotechnique (ST) inférieur disposé à l'intérieur du tube de lancement (DD) au-dessous de l'étage pyrotechnique (ST) supérieur ; chaque étage pyrotechnique (ST) comprend, en allant de l'embouchure de base vers l'embouchure supérieure, une charge de lancement (C) et des moyens d'effet (M) ;
    - un séparateur (1) interposé entre ledit étage pyrotechnique (ST) supérieur et ledit au moins un étage pyrotechnique (ST) inférieur ; ledit séparateur (1) comprenant un conduit axial (10), au centre du séparateur (1), à l'intérieur duquel un cordeau détonant (U) est destiné à être disposé ;
    caractérisé en ce que ledit séparateur (1) comprend un premier et mince disque d'extrémité (11) en carton, un second et mince disque d'extrémité (12) en carton ayant les deux un diamètre (d1) et au moins un anneau d'entretoise (2) en carton qui a un diamètre (d2) et qui est interposé entre le premier et mince disque d'extrémité (11) et ledit second et mince disque d'extrémité (12) ; où le diamètre interne (d3) du tube de lancement (DD) est majeur du diamètre (d2) de l'anneau d'entretoise (2) et il est mineur du diamètre (d1) des minces disques d'extrémité (11, 12) ; lesdits minces disques d'extrémité (11, 12, 13) comprenant une portion de périmètre (5), ayant la forme d'une couronne annulaire qui déborde par rapport aux anneaux d'entretoise (2) ; ladite portion de périmètre (5) comprenant un bord destiné à adhérer sur la surface interne du tube de lancement (DD).
  2. Dispositif pyrotechnique (100) selon la revendication 1, où ledit séparateur (1) comprend une pluralité d'anneaux d'entretoise (2) en carton interposés entre le premier et mince disque d'extrémité (11) et ledit second et mince disque d'extrémité (12) ; ledit séparateur (1) comprenant une pluralité de minces disques intermédiaires (13) en carton, identiques aux minces disques d'extrémité (11, 12) et interposés entre chaque paire d'anneaux d'entretoise (2) en carton.
  3. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, où le rapport entre le diamètre (d2) du dit au moins un anneau d'entretoise (2) et le diamètre (d1) des minces disques (11, 12, 13) va de 0,7 à 0,9.
  4. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, comprenant une pluralité superposée d'étages pyrotechniques (ST) disposés au-dessous de l'étage pyrotechnique (ST) supérieur ; ledit dispositif pyrotechnique (100) comprenant une pluralité de séparateurs (1), chacun desquels est interposé entre deux étages pyrotechniques (ST) superposés.
  5. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, comprenant un séparateur (1) supérieur disposé au-dessus de l'étage pyrotechnique (ST) supérieur.
  6. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, où ladite portion de périmètre (5) de chaque mince disque (11, 12, 13) a une largeur qui va de 1 mm à 5 mm.
  7. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, où chaque mince disque (11, 12, 13) du séparateur (1) a une épaisseur d'environ 1 mm - 2 mm.
  8. Dispositif pyrotechnique (100) selon l'une quelconque des revendications précédentes, où chaque anneau d'entretoise (2) a une épaisseur qui va de 6 mm à 8 mm.
EP20206850.8A 2019-11-29 2020-11-11 Dispositif pyrotechnique à plusieurs étages doté d'un séparateur d'étage en carton Active EP3828491B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000022569A IT201900022569A1 (it) 2019-11-29 2019-11-29 Dispositivo pirotecnico a piu' stadi suddivisi da un separatore in cartone.

Publications (2)

Publication Number Publication Date
EP3828491A1 EP3828491A1 (fr) 2021-06-02
EP3828491B1 true EP3828491B1 (fr) 2022-02-02

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EP20206850.8A Active EP3828491B1 (fr) 2019-11-29 2020-11-11 Dispositif pyrotechnique à plusieurs étages doté d'un séparateur d'étage en carton

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EP (1) EP3828491B1 (fr)
ES (1) ES2912590T3 (fr)
IT (1) IT201900022569A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5348877Y2 (fr) * 1976-03-17 1978-11-22
JP2004003782A (ja) * 2002-05-31 2004-01-08 Ishikawa Enka Kk 玩具用乱玉花火
CN1696598A (zh) * 2005-06-24 2005-11-16 黄明发 花炮吐珠类及盆花类新产品及其制作方法

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IT201900022569A1 (it) 2021-05-29
EP3828491A1 (fr) 2021-06-02

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