EP1205727A1 - Moyens d'initiation pyrotechnique retardateurs - Google Patents
Moyens d'initiation pyrotechnique retardateurs Download PDFInfo
- Publication number
- EP1205727A1 EP1205727A1 EP01402863A EP01402863A EP1205727A1 EP 1205727 A1 EP1205727 A1 EP 1205727A1 EP 01402863 A EP01402863 A EP 01402863A EP 01402863 A EP01402863 A EP 01402863A EP 1205727 A1 EP1205727 A1 EP 1205727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pyrotechnic
- delay
- means according
- explosive charge
- initiation means
- 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.)
- Granted
Links
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Classifications
-
- 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
- F42B3/16—Pyrotechnic delay initiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/28—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids
- F42C15/31—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids generated by the combustion of a pyrotechnic or explosive charge within the fuze
Definitions
- the technical sector of the present invention is that of the firing devices of a charge pyrotechnics especially for hand grenade, and more particularly the means of initiation pyrotechnic retarders of a pyrotechnic chain.
- Retardant pyrotechnic elements are used for many years in different fields like detonators for firing in mines and quarries, all types of rockets (artillery, infantry mines, grenades, mortars ). They are also numerous only essential and can be defined as elements of a pyrotechnic chain in which they ensure a time interval between a priming action and a specific response.
- pyrotechnic initiation retarders however remain fairly similar in their general concept: it is a percussion primer intended to be struck by any striker for then allow the ignition of a retarding composition which it aims to consume and ignite in turn another element of the pyrotechnic chain.
- Another similar technique is to replace the explosive or reinforcing charge by a detonator which will ensure the continued lighting of the chain pyrotechnic. This is notably the technique used in documents FR 2,465,189 and FR 2,458,790.
- the ignition of the explosive charge or the activation of the detonator by the retarding composition directly leads to propagation of fire in the pyrotechnic chain and the explosion of the pyrotechnic charge of the grenade type hand through the igniter plug in which finds the firing device.
- the document FR 2.721.394 offered to insert a striker between the charge reinforcing agent ignited by the retarding composition and the continuation of the pyrotechnic chain including in particular a detonator and another explosive charge.
- This striker is provided with an explosive charge allowing it using gases released by the reaction of the explosive charge to rotate around its axis and thus being able to strike another percussion primer to continue lighting the chain pyrotechnic.
- the object of the invention is therefore to remedy the disadvantages mentioned above by proposing means pyrotechnic initiation retardants improving the safety during handling before launching igniter plugs especially for hand grenade.
- Another object of the invention is to provide means initiation pyrotechnic retarders for decreasing pyrotechnic charge firing devices the danger of explosion when transported or worn on potential fighters.
- Another goal is the possibility of storage grenades with their igniter plug unlike conventional igniters which must be stored away from grenades.
- the invention will aim to reduce the costs of pyrotechnic charge firing devices using pyrotechnic initiation means retarders allowing direct cost reduction linked to the retardant load compactness analyzes.
- the invention relates to means pyrotechnic initiation retarders intended in particular to cooperate with a device for igniting a charge igniter plug type pyrotechnics especially for hand grenade, comprising a retarding composition located inside a delay column, the latter having a lower end and an upper end, a percussion primer being able to cooperate with the upper part of the delay column, and a piston striker held firmly under the lower end of the delay column and able to move axially in the direction of the element to strike under the action of a load explosive cooperating with the lower end of the delay column.
- the delay column communicates with the explosive charge through a cavity comprising sealing means authorizing or preventing movement of the striker piston under the effect of the explosive charge.
- the means for closing the cavity are consisting of rigid slag resulting from the reaction of combustion of the retarding composition.
- the striker piston preferably includes a cavity internal in which the load is able to lodge explosive to significantly deform the walls of this internal cavity during the explosion of said charge explosive.
- the percussion primer used is preferably boxer type and is set in a primer holder itself set in a delay holder including the delay column previously loaded with retarding composition.
- the expansion chamber can be inside delay holder and be between the composition retarder and percussion primer.
- the delay holder is screwed onto a body including in particular a through bore capable of guiding the striker piston which is held under the end bottom of the delay column via a collar.
- the explosive charge used to move the piston striker may be in an internal cavity in the piston and consists of lead azide, dinitro-resorcinate lead or lead styphnate.
- these means can be combined with a detonator capable of being struck by the striker piston, the detonator being confined in a rotor or lock can be pivoted through a stress exterior.
- pyrotechnic initiation retarders intended in particular to cooperate with a device for igniting a charge pyrotechnic (not shown). These means can register in a firing device for a charge igniter plug type pyrotechnics, in particular for hand grenades (as described in document FR 2,272,394), rifle grenades, mines, rockets artillery or mortar or any other application pyrotechnics requiring such delay.
- a percussion primer (1) of the boxer type inserted and set in a primer holder (2).
- the device can naturally work with a primer electric instead of a percussion primer. All constituted by the primer (1) and the primer holder (2) is itself positioned and set in a delay holder (3), the crimps being sealed by a bead of varnish, epoxide or cyanoacrylate.
- the delay holder (3) has been previously loaded with a retarding composition (4) to inside a delay column (4C) having two ends (4a, 4b).
- This retarding composition (4) will be of the type "Millisecond” or "second” depending on the use that is made of the pyrotechnic train.
- the nominal burning time will be between 3.5 and 5 seconds, whereas for a mortar rocket with launch safety, the time will be between 100 and 500 milliseconds.
- These combustion times are governed by a multitude of parameters that will be important to integrate during the preparation of the retarding composition (4); these parameters are very well known to those skilled in the art. These include the nature of the ingredients, the nature of the binder, particle size and purity of components, hygroscopicity, compression ratio of the retarding composition in the delay column, of the gas pressure generated, the nature of the case or again of the diameter of the delay column.
- the loading of this delay column (4c) is done by successive dosages of increments; it is also possible add an ignition charge to the top of the delay column (4c); this ignition composition will then compressed at the same pressure as the retard powder.
- the delay holder (3) includes an expansion chamber (9) located between the percussion primer (1) and the end upper (4b) of the delay column (4c); this delay holder (3) is, in this preferred embodiment of the invention, screwed onto a body (7) provided with a bore (17) opening allowing the movement and guidance of a striker piston (5). The latter is fixed firmly between the body (7) and the delay holder (3), and this under the end lower (4a) of the delay column.
- the striker piston is held firmly in its position by a flange (5a), but could also to be by means such as a spring, a cover frangible or an o-ring or a washer.
- Nature metal of the striker piston (5) and the thickness of the flange (5a) will then define an explosive charge (10) to be administered to ensure the proper functioning of these means.
- the explosive charge (10) is contained in an internal cavity (6) in the piston striker but could just as easily be at the outside of the striker piston (5) as in particular in the delay holder (3).
- the advantage of this arrangement with the explosive charge (10) inside the striker piston (5) lies in providing additional security for means of pyrotechnic initiation which will be described in the operation of these means.
- This explosive charge (10) communicates with the lower end (4a) of the delay column (4c) via a cavity (8) comprising sealing means (4d) and in which will come contain the gases generated by the charge explosion explosive (10).
- the closure means (4d) of the cavity (8) consist of solid slag resulting from the combustion reaction of the retarding composition (4) in the delay column (4c).
- initiation pyrotechnic retarders associated with another element of the pyrotechnic chain comprising a detonator (11), a relay (13) and a booster (14) ensuring the firing of the rest of the pyrotechnic chain.
- the detonator (11) is located inside a rotor or latch (12) which is able to align with the piston striker and relay (13) after a request exterior.
- the percussion primer (1) can be combined with a striker (15) and a spring (16) acting in compression.
- the delay column (4c) When the delay column (4c) is correctly loaded over the entire height and at the right density, it has a large mass of rigid solid slag formed by the combustion of the retarding composition (4) and occupying substantially the same volume as that of this retarding composition (4) before combustion.
- the flame reaches the bottom of this delay column it ignites the explosive charge (10) contained in the striker piston (5).
- This explosion generates a significant amount of gas which then remains confined in the cavity (8) thanks to obturation of the lag column caused by slag solids (4d).
- the purpose of this reaction is to shear the collar and project the striker piston down, the latter can then strike the detonator (11).
- these means are arranged so that the charge explosive (10) is located in an internal cavity (6) of the striker piston (5).
- These accidental departures may be due to multiple reasons influencing in particular the retarding composition (4) or on the load explosive (10), both of which are known to be very sensitive. These are among other conditions extreme environmental conditions such as high temperatures or still accidental conditions occurring during the storage, transport or handling before placing using such means. It should be noted that other factors may be involved in accidental release of the piston like the percussion of these means by a bullet or the detonation of the primary explosive by the influence from an outside explosion.
- the detonator (11) is misaligned with the striker piston (5), it there is always a risk of spreading hot gases or flames generated by the explosion of the explosive charge (10) can then cause the combustion of the relay (13) as well as all the unfortunate consequences that the detonation could have. This is the reason why the explosive charge (10) is placed inside the piston striker (5) in this preferred embodiment. When the latter is released, the deformable walls of the internal cavity (6) of the piston (5) will deform following the explosion of the explosive charge (10) to come press against the bore (17) in which the piston (5) is able to translate.
- the percussive primer (1) or the retarding composition (4) ignites the explosive charge (10) contained in the striker piston (5)
- the trigger gas will be in a volume larger than that of the cavity (8); indeed, the quantity of rigid slag formed by the combustion of the retarding composition does not will not be large enough to withstand the pressure of gases generated by this combustion.
- These gases will therefore pass through the slag cap to be distributed in a volume equal to that which contained the retarding composition (4) plus that of the expansion chamber (9). Therefore, the reaction will be insufficient to shear the flange and propel the striker piston down; there will be therefore no final effect on the pyrotechnic train, even in case of alignment of the detonator (11).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicinal Preparation (AREA)
- Automotive Seat Belt Assembly (AREA)
- Fuses (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Synchronizing For Television (AREA)
- Thermally Insulated Containers For Foods (AREA)
Abstract
Description
- la figure 1 représente une vue en coupe longitudinale des moyens d'initiation pyrotechnique retardateurs avant la combustion de la composition retardatrice ;
- la figure 2 représente une vue en coupe longitudinale des moyens d'initiation pyrotechnique retardateurs après la combustion de la composition retardatrice et avant l'explosion de la charge explosive ;
- la figure 3 représente une vue en coupe longitudinale des moyens d'initiation pyrotechnique retardateurs avant la combustion de la composition retardatrice et associés à un autre élément de la chaíne pyrotechnique comprenant un détonateur et un renforçateur.
Claims (11)
- Moyens d'initiation pyrotechnique retardateurs destinés notamment à coopérer avec un dispositif de mise à feu d'une charge pyrotechnique du type bouchon allumeur notamment pour grenade à main, comprenant une composition retardatrice (4) située à l'intérieur d'une colonne retard (4c), cette dernière ayant une extrémité inférieure (4a) et une extrémité supérieure (4b), une amorce à percussion (1) étant apte à coopérer avec la partie supérieure (4b) de la colonne retard (4c), et un piston percuteur (5) maintenu fermement sous l'extrémité inférieure (4a) de la colonne retard (4c) et pouvant se déplacer axialement dans le sens de l'élément à percuter sous l'action d'une charge explosive (10) coopérant avec l'extrémité inférieure (4a) de la colonne retard (4c), caractérisés en ce que l'extrémité inférieure (4a) de la colonne retard (4c) communique avec la charge explosive (10) par l'intermédiaire d'une cavité (8) comprenant des moyens d'obturation (4d) autorisant ou interdisant le déplacement du piston percuteur (5) sous l'effet de la charge explosive (10) ;
- Moyens d'initiation pyrotechnique retardateurs selon la revendication 1, caractérisés en ce que les moyens d'obturation (4d) sont constitués de scories rigides (4d) résultant de la réaction de combustion de la composition retardatrice (4) ;
- Moyens d'initiation pyrotechnique retardateurs selon la revendication 1 ou la revendication 2, caractérisés en ce que le piston percuteur (5) comprend une cavité interne (6) dans laquelle est apte à venir se loger la charge explosive (10) pour déformer sensiblement les parois de cette cavité interne (6) lors de l'explosion de ladite charge explosive (10) ;
- Moyens d'initiation pyrotechnique retardateurs selon l'une quelconque des revendications précédentes, caractérisés en ce que l'amorce à percussion (1) est du type boxer et sertie dans un porte-amorce (2), ces deux éléments étant tous deux sertis dans un porte-retard (3) ;
- Moyens d'initiation pyrotechnique retardateurs selon la revendication 4, caractérisés en ce que le porte-retard (3) comprend la colonne retard (4c) préalablement chargée de la composition retardatrice (4) ;
- Moyens d'initiation pyrotechnique retardateurs selon la revendication 4 ou la revendication 5, caractérisés en ce que le porte-retard (3) comprend la chambre d'expansion (9), cette dernière étant située entre l'amorce à percussion (1) et la composition retardatrice (4) ;
- Moyens d'initiation pyrotechnique retardateurs selon l'une quelconque des revendications 4, 5 ou 6, caractérisés en ce que le porte-retard (3) est vissé sur un corps (7) muni d'un alésage (17) débouchant apte à guider le piston percuteur (5) ;
- Moyens d'initiation pyrotechnique retardateurs selon la revendication 7, caractérisés en ce que le piston percuteur (5) est placé fermement entre le porte-retard (3) et le corps (7) par l'intermédiaire de moyens du type collerette ;
- Moyens d'initiation pyrotechnique retardateurs selon l'une quelconque des revendications précédentes, caractérisés en ce que la charge explosive (10) est du type azoture de plomb, dinitro-résorcinate de plomb ou styphnate de plomb ;
- Moyens d'initiation pyrotechnique retardateurs selon l'une quelconque des revendications précédentes, caractérisés en ce que le piston percuteur (5) est propulsé sur un détonateur (11) confiné dans un rotor ou un verrou (12) pouvant pivoter par une sollicitation extérieure pour s'aligner avec le piston percuteur (5) et un relais (13) conduisant à une charge renforçatrice (14) ;
- Moyens d'initiation pyrotechnique retardateurs selon l'une quelconque des revendications précédentes, caractérisés en ce que l'amorce percutante (1) est apte à coopérer avec un percuteur (15).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0014390 | 2000-11-09 | ||
| FR0014390A FR2816401B1 (fr) | 2000-11-09 | 2000-11-09 | Moyens d'initiation pyrotechnique retardateurs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1205727A1 true EP1205727A1 (fr) | 2002-05-15 |
| EP1205727B1 EP1205727B1 (fr) | 2004-12-29 |
Family
ID=8856240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01402863A Expired - Lifetime EP1205727B1 (fr) | 2000-11-09 | 2001-11-08 | Moyens d'initiation pyrotechnique retardateurs |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6578489B2 (fr) |
| EP (1) | EP1205727B1 (fr) |
| AT (1) | ATE286237T1 (fr) |
| CA (1) | CA2363293A1 (fr) |
| DE (1) | DE60108055T2 (fr) |
| ES (1) | ES2234791T3 (fr) |
| FR (1) | FR2816401B1 (fr) |
| NO (1) | NO20015467L (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008032744B4 (de) * | 2008-07-11 | 2010-04-01 | Junghans Microtec Gmbh | Zünder für ein Geschoss |
| DE102009059951B4 (de) | 2009-12-22 | 2012-05-03 | Diehl Bgt Defence Gmbh & Co. Kg | Handgranatenzünder |
| US8776689B2 (en) * | 2011-03-25 | 2014-07-15 | Vincent Gonsalves | Energetics train reaction and method of making an intensive munitions detonator |
| US8453573B1 (en) * | 2011-06-15 | 2013-06-04 | The United States Of America As Represented By The Secretary Of The Army | Primer adapter for hand grenade fuze |
| US10989509B2 (en) * | 2017-10-05 | 2021-04-27 | Combined Systems, Inc. | Primer adapter assembly |
| CN110260742B (zh) * | 2019-07-05 | 2023-07-07 | 中国人民解放军陆军工程大学 | 密闭空间分段间隔装药爆炸隔爆及延时传爆装置和方法 |
| EP3767223B1 (fr) | 2019-07-15 | 2024-04-03 | Rheinmetall Waffe Munition ARGES GmbH | Système, en particulier grenade à main |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1147516B (de) * | 1960-10-24 | 1963-04-18 | Hans Assmann Dipl Ing | Handgranatenzuender |
| DE1428801A1 (de) | 1964-03-19 | 1969-04-30 | Prb Nv | Zuender |
| US3823669A (en) | 1973-01-29 | 1974-07-16 | Us Army | Fail-safe hand grenade |
| FR2353041A1 (fr) | 1976-05-28 | 1977-12-23 | Sarmac Sa | Bouchon allumeur, notamment pour grenade a main |
| FR2458790A1 (fr) | 1979-06-08 | 1981-01-02 | Alsetex | Bouchon allumeur de grenade polyvalent a securite de lancement |
| FR2465189A1 (fr) | 1979-09-17 | 1981-03-20 | Ruggieri Ets | Bouchon allumeur pour grenade |
| FR2557969A1 (fr) * | 1984-01-11 | 1985-07-12 | France Etat Armement | Dispositif de freinage d'un mobile pyrotechnique et application a une fusee d'ogive d'obus |
| WO1994025819A1 (fr) * | 1993-04-29 | 1994-11-10 | Assman, Hans | Fusee, notamment pour grenades a main |
| FR2721394A1 (fr) | 1994-06-16 | 1995-12-22 | France Etat Armement | Dispositif de mise à feu d'une charge pyrotechnique du type bouchon allumeur notamment pour grenade à main ayant trois modes de fonctionnement. |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3786754A (en) * | 1968-12-20 | 1974-01-22 | Us Navy | Firing delay for point detonating fuze |
| US3638572A (en) * | 1969-02-18 | 1972-02-01 | Us Navy | Delay train for ordnance fuse |
| CH572210A5 (fr) | 1974-05-22 | 1976-01-30 | Zellweger Uster Ag | |
| US4078496A (en) * | 1976-11-05 | 1978-03-14 | The United States Of America As Represented By The Secretary Of The Army | Antirunaway device for hand grenade fuze |
| US4119040A (en) * | 1977-07-25 | 1978-10-10 | The United States Of America As Represented By The Secretary Of The Army | Variable time fuze |
| US4860657A (en) * | 1978-05-05 | 1989-08-29 | Buck Chemisch-Technische Werke Gmbh & Co. | Projectile |
| DE8104477U1 (de) * | 1981-02-18 | 1982-08-05 | Diehl GmbH & Co, 8500 Nürnberg | Fliehkraftabhaengige sicherung fuer den schlagbolzen eines aufschlagzuenders fuer geschosse |
| US4480551A (en) * | 1983-06-08 | 1984-11-06 | Whittaker Corporation | Point-detonating variable time-delayed fuze |
| IL81198A0 (en) * | 1987-01-08 | 1987-08-31 | Israel State | Safetied demolition charge fuse |
| US5046567A (en) * | 1989-11-13 | 1991-09-10 | Mecano-Tech, Inc. | Adiabatically induced ignition of combustible materials |
| US5686692A (en) * | 1996-09-30 | 1997-11-11 | The United States Of America As Represented By The Secretary Of The Navy | Single fuse follow-through grenade |
-
2000
- 2000-11-09 FR FR0014390A patent/FR2816401B1/fr not_active Expired - Fee Related
-
2001
- 2001-11-08 ES ES01402863T patent/ES2234791T3/es not_active Expired - Lifetime
- 2001-11-08 DE DE60108055T patent/DE60108055T2/de not_active Expired - Lifetime
- 2001-11-08 EP EP01402863A patent/EP1205727B1/fr not_active Expired - Lifetime
- 2001-11-08 NO NO20015467A patent/NO20015467L/no not_active Application Discontinuation
- 2001-11-08 AT AT01402863T patent/ATE286237T1/de not_active IP Right Cessation
- 2001-11-08 CA CA002363293A patent/CA2363293A1/fr not_active Abandoned
- 2001-11-09 US US09/986,780 patent/US6578489B2/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1147516B (de) * | 1960-10-24 | 1963-04-18 | Hans Assmann Dipl Ing | Handgranatenzuender |
| DE1428801A1 (de) | 1964-03-19 | 1969-04-30 | Prb Nv | Zuender |
| US3823669A (en) | 1973-01-29 | 1974-07-16 | Us Army | Fail-safe hand grenade |
| FR2353041A1 (fr) | 1976-05-28 | 1977-12-23 | Sarmac Sa | Bouchon allumeur, notamment pour grenade a main |
| FR2458790A1 (fr) | 1979-06-08 | 1981-01-02 | Alsetex | Bouchon allumeur de grenade polyvalent a securite de lancement |
| FR2465189A1 (fr) | 1979-09-17 | 1981-03-20 | Ruggieri Ets | Bouchon allumeur pour grenade |
| FR2557969A1 (fr) * | 1984-01-11 | 1985-07-12 | France Etat Armement | Dispositif de freinage d'un mobile pyrotechnique et application a une fusee d'ogive d'obus |
| WO1994025819A1 (fr) * | 1993-04-29 | 1994-11-10 | Assman, Hans | Fusee, notamment pour grenades a main |
| FR2721394A1 (fr) | 1994-06-16 | 1995-12-22 | France Etat Armement | Dispositif de mise à feu d'une charge pyrotechnique du type bouchon allumeur notamment pour grenade à main ayant trois modes de fonctionnement. |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60108055D1 (de) | 2005-02-03 |
| US6578489B2 (en) | 2003-06-17 |
| ATE286237T1 (de) | 2005-01-15 |
| NO20015467L (no) | 2002-05-10 |
| ES2234791T3 (es) | 2005-07-01 |
| CA2363293A1 (fr) | 2002-05-09 |
| FR2816401B1 (fr) | 2002-12-20 |
| EP1205727B1 (fr) | 2004-12-29 |
| FR2816401A1 (fr) | 2002-05-10 |
| NO20015467D0 (no) | 2001-11-08 |
| US20020046673A1 (en) | 2002-04-25 |
| DE60108055T2 (de) | 2005-12-15 |
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