EP2482028B1 - Sicherheits- und Zündvorrichtung mit einem zerbrechlichen Riegel - Google Patents

Sicherheits- und Zündvorrichtung mit einem zerbrechlichen Riegel Download PDF

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Publication number
EP2482028B1
EP2482028B1 EP12290028.5A EP12290028A EP2482028B1 EP 2482028 B1 EP2482028 B1 EP 2482028B1 EP 12290028 A EP12290028 A EP 12290028A EP 2482028 B1 EP2482028 B1 EP 2482028B1
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EP
European Patent Office
Prior art keywords
shutter
tongue
substrate
safety
projectile
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.)
Active
Application number
EP12290028.5A
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English (en)
French (fr)
Other versions
EP2482028A1 (de
Inventor
Christian Pisella
Christophe Kergueris
Laurent Reynard
Renaud Lafont
Pierre-Marie Visse
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.)
Nexter Munitions SA
Original Assignee
Nexter Munitions 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 Nexter Munitions SA filed Critical Nexter Munitions SA
Priority to PL12290028T priority Critical patent/PL2482028T3/pl
Publication of EP2482028A1 publication Critical patent/EP2482028A1/de
Application granted granted Critical
Publication of EP2482028B1 publication Critical patent/EP2482028B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
    • F42C15/184—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a slidable carrier
    • 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
    • F42C15/24—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means
    • 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
    • F42C15/34—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by a blocking-member in the pyrotechnic or explosive train between primer and main charge

Definitions

  • the technical field of the invention is that of security and arming devices for a pyrotechnic chain of a projectile and in particular micro-machined security and arming devices.
  • Security and arming devices are well known. They generally comprise a screen closing a transmission channel which connects a detonator and a pyrotechnic charge.
  • the screen is thus interposed on the transmission of the detonation wave between the detonator and the load and it prevents the operation of the latter.
  • the patent EP2077431 thus describes a micro-machined safety and arming device in which the arming is completely mechanical while satisfying the most demanding safety conditions.
  • a first lock or acceleration lock is released during the firing.
  • This lock moves back against the action of a return spring and it emerges from a rod secured to the shutter. Once cleared from the shutter, the first lock immobilizes relative to the substrate by appropriate indentations.
  • a second latch or centrifugal latch is released by the displacement (under the effect of the rotation of the projectile) of a counterweight housed in the flap.
  • Such a safety and arming device thus makes it possible to use two independent environmental conditions for arming: the longitudinal firing acceleration and the centrifugal acceleration. This double security allows this device to comply with the highest standards of projectile arming safety (STANAG 4187).
  • the first lock in particular occupies a significant place in the device. It imposes an increase in the dimensions of the substrate of the component and also requires to provide on the movable flap a rod cooperating with the first lock. So that this rod does not remain protruding in the armed position in the pyrotechnic transmission channel, it is necessary to increase the stroke of the flap, which further penalizes the dimensions of the device.
  • the object of the invention is to propose a micro-machined safety and arming device that does not have such a disadvantage.
  • the device proposed by the invention incorporates a simplified structure acceleration lock which ensures both compactness and reliability for the device.
  • the subject of the invention is a micro-machined or micro-engraved security and arming device for a pyrotechnic chain of a projectile, the device comprising a substrate on which is disposed a shutter ensuring the closure of a channel, flap which is movable in translation on the substrate, wherein the flap is held immobilized in the safety position by at least one acceleration lock which is released as a result of the application of the axial acceleration communicated to the projectile during firing , characterized in that the acceleration lock is constituted by at least one breakable tab connecting the flap to the substrate, oriented tongue and dimensioned so that the axial inertia forces developed during the firing and exerted on the flap cause the breaking of said tongue.
  • At least one tongue may be oriented along the axis of the projectile so as to be stressed in tension or in compression.
  • At least one tongue may be oriented perpendicular to the axis of the projectile so as to be stressed in shear.
  • At least one tongue may be connected to the flap and / or the substrate by a support of increasing width between the tongue and the flap and / or the substrate.
  • the figure 1 shows a projectile 1 of medium caliber (caliber less than 50 mm), which comprises a body 2 of axis 2a containing an explosive charge 3.
  • the body 2 receives at its front part a rocket 4 which is screwed into a thread of 2.
  • the fuse 4 comprises a housing 8 which contains a firing charge 5.
  • the firing charge 5 is intended to be initiated by a pyrotechnic chain comprising a detonator 6 and a relay 7 (alternatively this relay 7 could be omitted and the detonator 6 would then directly initiate the priming charge 5).
  • the detonator 6 is here a percussion detonator which is initiated by a striker 9 slidably mounted in a nose 10 secured to the casing 8 of the rocket 4. During the impact of the projectile 1 on a target, the striker 9 is projected onto the detonator 6. The striker is held in place during the storage and firing phases by a shear washer 11.
  • the rocket 4 also contains a security and arming device 12 which makes it possible to interrupt the pyrotechnic chain during the storage and firing phases of the projectile 1.
  • this safety and arming device is made in the form of a micro-machined or micro-engraved device (MEMS). It thus comprises a substrate 13 on which is mounted a sliding shutter 14 which ensures the interruption of the pyrotechnic chain.
  • MEMS micro-machined or micro-engraved device
  • the substrate 13 has two orifices 15a and 15b disposed on either side of the flap 14.
  • the detonator 6 must have the minimum size to ensure operation and it will be coupled to a suitable pyrotechnic relay 7 (or 5). It has been verified that by using a detonator comprising an output stage of 10 milligrams of hexogen coupled to a very insensitive relay, for example in HNS (hexanitrostilbene), it was possible to make orifices 15a, 15b ( or transmission channels) of less than 1 mm 2 section (channel diameter of the order of mm) while guaranteeing the desired initiation transmission.
  • HNS hexanitrostilbene
  • the projectile 1 is also provided with a belt 2b which takes the stripes of the barrel of the weapon (not shown) and which communicates to the projectile 1 a rotational movement about its axis 2a during firing.
  • the figure 2 shows in simplified manner the internal structure of a first embodiment of the safety and arming device 12 according to the invention.
  • the device comprises a substrate 13 on which is disposed a pyrotechnic chain interruption flap 14 which is movable in translation on the substrate in a cavity 31.
  • a pyrotechnic chain interruption flap 14 which is movable in translation on the substrate in a cavity 31.
  • figure 2 an arrow A which indicates the direction of movement of the flap 14 during arming. This direction is perpendicular to the axis 2a of the projectile (which coincides with the axis 16 of the orifices 15a and 15b).
  • the flap 14 is made by micro-machining or micro-etching according to MEMS production techniques which are well known to those skilled in the art.
  • the chain interruption flap 14 is held immobilized by at least one acceleration lock 17.
  • the device will also preferably include another shutter latch which will be released by centrifugal force.
  • This type of lock is not the subject of the present invention. He was not represented to simplify the description. For example, the solution described by the EP2077431 cited in the preamble of this application.
  • tabs 29 secured to the substrate 13 are engaged in notches 30 arranged on a side surface of the flap 14. These tabs do not prohibit the movement of the flap in the arming direction A. Tabs and notches constitute means for prohibiting the return of the flap in the safety position at the end of its arming movement.
  • the device here comprises an axial acceleration latch 17 consisting of two breakable tongues 18 which connect the flap 14 to the substrate 13. Each tab is integral with a lateral edge 14a or 14b of the flap 14.
  • the figure 3a shows enlargedly an embodiment of such a tongue 18.
  • the tabs 18 ensuring the suspension of the shutter are oriented parallel to the axis of the projectile, so that the axial inertia forces F ⁇ , which are parallel to the axis 2a of the projectile, and which will be exerted on the flap 14 during firing will cause their break.
  • F ⁇ axial inertia forces
  • tongues 18 will be dimensioned such that this rupture only occurs for the inertia forces associated with the firing and not during the shocks received by the device during the handling phases or during the logistics operations.
  • the width e of the tongue 18 will thus be calibrated to break during an acceleration of the order of 50000 m / s 2 , which is the order of magnitude of the accelerations experienced by the projectiles of medium caliber (lower caliber or equal to 40mm).
  • the tongue 18 is connected to the flap 14 on the one hand and to the substrate 13 on the other hand by supports 20a and 20b whose width is increasing between the tongue 18 and the flap 14 on the one hand and the substrate 13 of somewhere else.
  • These supports 20a, 20b are here triangular. Such an arrangement makes it possible to better control the location of the break on the tongue 18. By giving different dimensions to the widened supports 20a, 20b, it will be possible in particular to bring the rupture zone constituted by the tongue 18 closer to the flap or the substrate.
  • the axial acceleration lock 17 may be produced in the form of tongues that are stressed in tension, in compression, or in tongues stressed in shear, or in a combination of several types of tongues.
  • figure 3b an example of a device in which the tongue 18 is oriented perpendicular to the axis of the projectile (therefore perpendicular to the direction of F ⁇ ) so as to be stressed in shear.
  • This solution is particularly well suited to the field of medium caliber projectiles for which the reversibility of the operation of the device (return to safety position) does not arise.
  • the figure 2 shows tabs of the acceleration lock disposed between flap 14 and substrate 13 at longitudinal edges 14a and 14b which are parallel to Armament Directorate A of Part 14. On this figure 2 one of the tongues (the tongue of the upper edge 14a) is therefore biased in tension and the other tongue (that of the lower edge 14b) is biased in compression.
  • This lock may comprise a tongue 18 working in shear as shown in FIG. figure 4a or a pulling tongue as shown in FIG. figure 4b .
  • the Figures 5a and 5b show such embodiments of tabs 18 in the form of bars.
  • the figure 5a shows a bar 18 oriented relative to the inertia forces F ⁇ so as to be broken by traction.
  • the figure 5b shows a bar 18 oriented relative to the inertia forces F ⁇ so as to be broken by shearing.
  • the acceleration latch according to the invention has been described here by way of non-limiting example in its application to a safety and arming device in which the direction of action of the pyrotechnic chain is substantially parallel to the plane of the flap. .
  • This lock could also be envisaged for devices in which the shutter does not ensure the interruption of a pyrotechnic chain but the interruption of an optical control signal (for example for an initiation of an explosive by a laser beam ).
  • Such devices are known especially from EP1559986 , EP1559987 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Micromachines (AREA)
  • Lock And Its Accessories (AREA)

Claims (4)

  1. Mikrobearbeitete oder mikrogeätzte Vorrichtung zum Sichern und Scharfmachen (12) für eine pyrotechnische Kette eines Projektils, wobei die Vorrichtung ein Substrat (13) umfasst, auf dem eine Klappe (14) angeordnet ist, welche das Verschließen eines Kanals gewährleistet, wobei die Klappe auf dem Substrat (13) verschiebbar beweglich ist, wobei in der Vorrichtung die Klappe (14) in Sicherheitsposition durch wenigstens einen Beschleunigungsverschluss blockiert gehalten wird, welcher in Folge der Einwirkung der axialen Beschleunigung, die auf das Projektil beim Abschuss übertragen wird, freigegeben wird, wobei die Vorrichtung dadurch gekennzeichnet ist, dass der Beschleunigungsverschluss (17) von wenigstens einer zerbrechlichen Lasche (18) gebildet wird, welche die Klappe (14) mit dem Substrat verbindet, wobei die Lasche (18) derartig ausgerichtet und dimensioniert ist, dass die beim Abschuss entwickelten und auf die Klappe (14) ausgeübten axialen Trägheitskräfte den Bruch der sogenannten Lasche (18) verursachen.
  2. Vorrichtung zum Sichern und Scharfmachen nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens eine Lasche (18) gemäß der Achse (2a) des Projektils derartig ausgerichtet ist, dass sie auf Zug oder Druck belastet wird.
  3. Vorrichtung zum Sichern und Scharfmachen nach Anspruch 2, dadurch gekennzeichnet, dass wenigstens eine Lasche (18) senkrecht zur Achse (2a) des Projektils derartig ausgerichtet ist, dass sie auf Scherung belastet wird.
  4. Vorrichtung zum Sichern und Scharfmachen nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass wenigstens eine Lasche (18) über einen Träger (20a, 20b) mit steigender Breite zwischen der Lasche (18) und der Klappe (14) und / oder dem Substrat (13) mit der Klappe (14) und / oder dem Substrat (13) verbunden ist.
EP12290028.5A 2011-01-31 2012-01-25 Sicherheits- und Zündvorrichtung mit einem zerbrechlichen Riegel Active EP2482028B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12290028T PL2482028T3 (pl) 2011-01-31 2012-01-25 Urządzenie zabezpieczające i uzbrajające ze zrywaną blokadą

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1100310A FR2971048B1 (fr) 2011-01-31 2011-01-31 Dispositif de securite et d'armement a verrou cassable

Publications (2)

Publication Number Publication Date
EP2482028A1 EP2482028A1 (de) 2012-08-01
EP2482028B1 true EP2482028B1 (de) 2013-11-20

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EP12290028.5A Active EP2482028B1 (de) 2011-01-31 2012-01-25 Sicherheits- und Zündvorrichtung mit einem zerbrechlichen Riegel

Country Status (5)

Country Link
US (1) US8689690B2 (de)
EP (1) EP2482028B1 (de)
ES (1) ES2442908T3 (de)
FR (1) FR2971048B1 (de)
PL (1) PL2482028T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10837747B2 (en) * 2018-02-15 2020-11-17 Goodrich Corporation High explosive firing mechanism
FR3110687B1 (fr) 2020-05-20 2022-05-27 Nexter Munitions Projectile sous calibré et procédé de neutralisation d'un objectif en mettant en oeuvre un tel projectile.

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6173650B1 (en) 1999-06-30 2001-01-16 The United States Of America As Represented By The Secretary Of The Navy MEMS emergetic actuator with integrated safety and arming system for a slapper/EFI detonator
US6622629B2 (en) 2001-10-17 2003-09-23 Northrop Grumman Corporation Submunition fuzing and self-destruct using MEMS arm fire and safe and arm devices
US6964231B1 (en) * 2002-11-25 2005-11-15 The United States Of America As Represented By The Secretary Of The Army Miniature MEMS-based electro-mechanical safety and arming device
GB0305414D0 (en) 2003-03-08 2003-04-16 Qinetiq Ltd Electronic safety and arming unit
US7142087B2 (en) * 2004-01-27 2006-11-28 Lucent Technologies Inc. Micromechanical latching switch
US7216589B2 (en) 2004-01-27 2007-05-15 Lucent Technologies Inc. Fuse for projected ordnance
US7320286B2 (en) * 2004-10-18 2008-01-22 Aai Corporation Setback switch for safe and arm
FR2884602A1 (fr) * 2005-04-18 2006-10-20 Novatec Sa Sa Soc Systeme embarque hautement securise pour la mise a feu d'explosifs ou le deploiement d'organes
FR2892810B1 (fr) 2005-10-27 2010-05-14 Giat Ind Sa Dispositif de securite pyrotechnique a ecran micro usine
US7490552B1 (en) 2007-07-31 2009-02-17 The United States Of America As Represented By The Secretary Of The Navy MEMS microdetonator/initiator apparatus for a MEMS fuze
US7552681B1 (en) 2007-07-31 2009-06-30 The United States Of America As Represented By The Secretary Of The Navy MEMS fuze assembly
FR2926134B1 (fr) * 2008-01-07 2010-03-26 Nexter Munitions Dispositif de securite et d'armement micro-usine ou micro-grave
FR2971050B1 (fr) * 2011-01-31 2013-01-18 Nexter Munitions Dispositif de securite et d'armement pour une chaine pyrotechnique d'un projectile

Also Published As

Publication number Publication date
US20120192746A1 (en) 2012-08-02
FR2971048B1 (fr) 2013-01-11
PL2482028T3 (pl) 2014-04-30
EP2482028A1 (de) 2012-08-01
US8689690B2 (en) 2014-04-08
FR2971048A1 (fr) 2012-08-03
ES2442908T3 (es) 2014-02-14

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