EP2077431B1 - Mikromechanisch bearbeitete oder mikrogravierte Sicherungs- und Scharfstellungsvorrichtung - Google Patents

Mikromechanisch bearbeitete oder mikrogravierte Sicherungs- und Scharfstellungsvorrichtung Download PDF

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Publication number
EP2077431B1
EP2077431B1 EP09290003.4A EP09290003A EP2077431B1 EP 2077431 B1 EP2077431 B1 EP 2077431B1 EP 09290003 A EP09290003 A EP 09290003A EP 2077431 B1 EP2077431 B1 EP 2077431B1
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EP
European Patent Office
Prior art keywords
shutter
micro
safety
substrate
centrifugal
Prior art date
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EP09290003.4A
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English (en)
French (fr)
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EP2077431A2 (de
EP2077431A3 (de
Inventor
Renaud Lafont
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
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Nexter Munitions SA
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Priority to PL09290003T priority Critical patent/PL2077431T3/pl
Publication of EP2077431A2 publication Critical patent/EP2077431A2/de
Publication of EP2077431A3 publication Critical patent/EP2077431A3/de
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Publication of EP2077431B1 publication Critical patent/EP2077431B1/de
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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
    • F42C15/005—Combination-type safety mechanisms, i.e. two or more safeties are moved in a predetermined sequence to each other
    • 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
    • F42C15/26—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 using centrifugal force
    • 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.
  • DSAs Security devices
  • 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 US 6167809 describes a miniature device, according to the preamble of claim 1, also using MEMS technology but in which the second latch is actuated by the acceleration and not by the centrifugal force.
  • a first lock is released by a flyweight which under the effect of the acceleration will move in the opposite direction against the action of a spring, will unlock the first lock and set in a stop means.
  • the second latch is disengaged from a latch 59 and is set in motion by a not shown actuator, constituted by a pyrotechnic composition inserted in a channel. As stated in this patent, the second latch moves forward without any effect of the centrifugal force.
  • the patent US 6964231 describes such a micro-machined safety device comprising a flap carrying a pyrotechnic charge and sliding by the action of the centrifugal force. This shutter itself is immobilized by a lock that is erased by the acceleration of firing of the projectile.
  • the rocking latch is actuated by a pyrotechnic composition generating gas whose ignition is controlled by an electronic means.
  • Such a safety device and armament allows to use for arming two independent environmental conditions: longitudinal firing acceleration and centrifugal acceleration. This double security allows this device to comply with the highest standards of projectile arming safety (STANAG 4187).
  • the second latch (rocking latch) requires the implementation of a pyrotechnic composition and means of initiation thereof.
  • An electronics must therefore be provided to control the operation of this MEMS which is therefore unsuitable for use in ammunition of medium caliber (caliber less than 40 mm) for which the available volume is limited.
  • the object of the invention is to provide a micro-machined safety and arming device, of simple structure and satisfying the most demanding safety conditions, in particular requiring the presence of two independent environmental conditions for moving into an armed position.
  • the device according to the invention implements a 100% mechanical armament while ensuring a reliable pyrotechnic chain interruption.
  • the subject of the invention is a micro-machined or micro-engraved safety and arming device for a chain pyrotechnic projectile which is animated when firing an axial rotation movement, device comprising a substrate on which is disposed a pyrotechnic chain interruption flap which is movable in translation on the substrate, device in which the flap chain interruption is held immobilized by at least two latches, a first latch (or axial acceleration latch) which is released as a result of the application of the acceleration communicated to the projectile during firing and a second latch, characterized in that the second latch is a centrifugal latch which is released as a result of the rotation of the projectile, and in that the centrifugal latch comprises at least one interlocking locking finger of the substrate, which finger is held in an imprint of the flap when it occupies its locking position, the maintenance being provided by a micromachined centrifugal feeder which is itself slidably mounted in a the component.
  • the centrifugal weight will be slidably mounted against the action of a first spring means.
  • Braking means may be provided to slow the movement of the weight.
  • the flap itself can advantageously slide by the action of the centrifugal force and against the action of a second spring means.
  • the locking finger may be secured to the substrate by means of a flexible tongue.
  • the braking means may comprise lamellae secured to at least one of the flexible tongues, lamellae rubbing against a lateral surface of the weight.
  • the substrate will advantageously comprise an orifice on either side of the flap, the axis of these orifices, and therefore the direction of action of the pyrotechnic chain, being substantially parallel to the plane of the flap.
  • the figure 1 shows a projectile 1 of medium caliber (caliber less than 50 mm), which comprises a body 2 enclosing an explosive charge 3.
  • the body 2 receives at its front part a rocket 4 which is screwed into a tapping of the body 2.
  • the rocket 4 comprises a housing 8 which contains a firing charge 5.
  • the firing load 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 initiate directly 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 (hexanotrostilbene), 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 hexanotrostilbene
  • the projectile 1 is also provided with a belt 2a which takes the scratches of the barrel of the weapon (not shown) and which communicates to the projectile 1 a rotational movement about its axis during firing.
  • the figure 2 shows in more detail the internal structure of the safety device 12 according to the invention.
  • the device therefore comprises a substrate 13 on which is disposed a pyrotechnic chain interruption flap 14 which is movable in translation on the substrate.
  • 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.
  • orifices 15a and 15b which are disposed on either side of the flap 14 and the axis 16 of these orifices (thus the direction of action of the pyrotechnic chain).
  • the dimension L of the shutter 14 ensures the interruption of the pyrotechnic chain in the safety position of the device 12.
  • the chain interruption flap 14 is held immobilized by two bolts.
  • a first latch 17 (or axial acceleration latch) and a second latch which is a centrifugal latch released as a result of the rotation of the projectile 1.
  • the device according to the invention directly uses the centrifugal inertia to unlock the flap 14 while maintaining the safety of the beginning of trajectory (no arming before a certain distance traveled out of the tube).
  • the first latch 17 cooperates with a notch 18a carried by a rod 18 secured to the flap 14.
  • This latch 17 is held engaged in the rod 18 by a spring means 19 interposed between the latch 17 and the substrate 13.
  • the latch 17 also carries a bar 20 carrying at least one indentation. This bar 20 is intended to cooperate with a complementary cavity 21 carried by the substrate to ensure immobilization of the first latch 17 in its unlocked position.
  • the spring means 19 is of course also made according to micro-machining or micro-etching technologies (MEMS technologies).
  • MEMS technologies micro-machining or micro-etching technologies
  • the centrifugal latch comprises at least one locking pin 22 which is integral with the substrate 13.
  • the device here comprises two fingers 22 made in the form of cylindrical micro-machined or micro-etched discs and made integral with the substrate 13 via flexible tongues 23, also micro-machined or micro-engraved.
  • Each finger 22 is housed in a recess 24 of complementary shape and which is arranged in a housing 25 of the flap 14.
  • the fingers 22 are held in the cavities 24 by a micromachined or micro-engraved centrifugal feeder 26 which is itself slidably mounted with respect to the substrate 13 and in the housing 25 of the shutter 14.
  • the weight 26 is held in its locking position ( figure 2 ) by a first spring means 27 (also micro-machined or micro-engraved).
  • first spring means 27 also micro-machined or micro-engraved.
  • the mechanical characteristics of the first spring means 27 are chosen so that the weight 26 moves only as a result of the forces related to the centrifugal acceleration resulting from the rotation of the projectile 1 during firing.
  • the counterweight must however remain in its locking position when it will be subjected to efforts related to handling or falling of the projectile.
  • the substrate 13 carries a bar 28 carrying at least one indentation. This bar 28 is intended to cooperate with a complementary cavity 29 carried by the weight 26 to ensure immobilization of the weight 26 in its unlocked position.
  • the shutter 14 itself is slidably mounted in a housing 30 of the substrate 13. Once the latches 17, 22 are removed, the shutter 14 can slide in this housing 30 by the action of the centrifugal force and against the action of a second spring means 31 (here formed by two parallel springs).
  • lamellae 32 which are integral with the flexible tongues 23 and which rub against the lateral surfaces 33 of the weight 26 (surfaces which could possibly carry roughness or roughness).
  • the braking means can slow down the movement 26 of the weight, so to slow the erasure of the centrifugal locks 22. This ensures a mouth security during firing.
  • the arming device 12 will intervene after the course of a certain distance after the exit of the tube of the weapon.
  • the figure 3a shows the device in the position it adopts inside the barrel of the weapon when firing.
  • the firing acceleration causes the appearance of an axial inertia force Fy on the first latch 17. This latch thus releases the flap 14.
  • the latch 17 remains immobilized in its unlocked position by the engagement of the bar 20 in the cavity 21.
  • the flap 14 is, however, still maintained in the safety position by the centrifugal latch 26/22.
  • the figure 3b shows the device in the position that it adopts after its exit from the tube of the weapon and at a distance of the order of about fifty meters.
  • the centrifugal acceleration has caused the appearance of a radial inertia force F 1 ⁇ which is exerted on the flyweight 26.
  • the flyweight has gradually moved away against the action of the second spring means 27 and being slowed down by the friction of the lamellae 32 on the lateral surfaces 33 of the weight 26.
  • the stiffness of the spring means 27, and the braking means 32,33 are defined so as to delay the passage of the weight 26 to its unlocked position, so that the configuration according to the figure 3b only intervenes about fifty meters from the barrel of the weapon. The security is then optimal for the servants of the weapon.
  • the flap 14 is then no longer immobilized by the locks 22 and can therefore adopt its unlocked position ( figure 3c ).
  • the movement of the flap causes the tongues 23 bearing the latches 22 to deflect.
  • the housing 25 is defined with a depth sufficient to allow the bolts 22 to pass between the flyweight 26 and the flap 14.
  • the flap 14 no longer closes the orifices 15a, 15b.
  • the direction of action 16 of the pyrotechnic chain is released and the device is in the armed position. An impact on a target will initiate the explosive charge of the projectile.
  • the flap 14 is locked in its armed position by tabs 36 secured to the substrate 13 and which engage in notches 37 arranged on a side surface of the flap 14 so as to prohibit the return of the latter to its seat. security position.
  • the device according to the invention is extremely simple and compact. It has a totally mechanical structure and can be incorporated into a medium caliber projectile at a lower cost.
  • the axis 35 along which moves the weight 26 and the flap 14 is perpendicular to the axis 16 of the direction of pyrotechnic action.
  • the axis 35 therefore corresponds to a radial direction of the projectile and centrifugal inertia can be exerted on the flyweight 26 and the flap 14.
  • the integration of the device in a projectile is therefore extremely simple despite the reduced dimensions for this device 12. Indeed the pyrotechnic alignment of the axis 16 necessarily leads to a correct orientation of the device relative to the projectile.
  • the forms of the spring means may be different. They will be defined according to the shooting constraints that the projectile must undergo.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Air Bags (AREA)
  • Lock And Its Accessories (AREA)
  • Micromachines (AREA)

Claims (7)

  1. Mikrobearbeitete oder mikrogeätzte Sicherheits- und Beladevorrichtung (12) für eine pyrotechnische Kette eines Projektils (1), dem beim Abschuss eine axiale Drehbewegung verliehen wird, wobei die Vorrichtung ein Substrat (13) umfasst, auf dem eine Klappe (14) zur Unterbrechung der pyrotechnischen Kette angeordnet ist, welche auf dem Substrat (13) verschiebbar beweglich ist, wobei bei der Vorrichtung die Klappe (14) zur Unterbrechung der Kette durch wenigstens zwei Verriegelungen (17, 22) blockiert gehalten wird, eine erste Verriegelung (17) oder axiale Beschleunigungsverriegelung, welche in Folge der auf das Projektil (1) übertragene Beschleunigung beim Abschuss freigegeben wird, und eine zweite Verriegelung (22), wobei die Vorrichtung dadurch gekennzeichnet ist, dass die zweite Verriegelung (22) eine Fliehkraftverriegelung ist, welche in Folge der Drehung des Projektils (1) freigegeben wird, und dass die Fliehkraftverrriegelung wenigstens einen fest mit dem Substrat (13) verbundenen Verriegelungsfinger (22) umfasst, wobei der Finger in einer Vertiefung (24) der Klappe (14) festgehalten wird, wenn sie ihre Verriegelungsposition einnimmt, wobei das Festhalten durch ein mikrobearbeitetes Fliehgewicht (26) gewährleistet wird, welches selbst gleitend in einer Aufnahme (25) der Klappe (14) montiert ist.
  2. Sicherheits- und Beladevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Fliehgewicht (26) gleitend entgegen der Wirkung eines ersten Federmittels (27) montiert ist.
  3. Sicherheits- und Beladevorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass Bremsmittel (32) vorgesehen sind, um die Verschiebung des Gewichts (26) abzubremsen.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Klappe (14) selbst durch die Wirkung der Zentrifugalkraft und entgegen der Wirkung eines zweiten Federmittels (31) gleitet.
  5. Sicherheits- und Beladevorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Verriegelungsfinger (22) mit Hilfe einer flexiblen Leiste (23) fest mit dem Substrat (13) verbunden ist.
  6. Sicherheits- und Beladevorrichtung nach den Ansprüchen 3 und 5, dadurch gekennzeichnet, dass die Bremsmittel Lamellen (32) umfassen, die fest mit wenigstens einer der flexiblen Leisten (23) verbunden sind, wobei die Lamellen an einer Seitenfläche des Gewichtes (26) reiben.
  7. Sicherheits- und Beladevorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Substrat (13) eine Öffnung (15a,15b) beiderseits der Klappe (14) umfasst, wobei die Achse (16) dieser Öffnungen, somit die Wirkungsrichtung der pyrotechnischen Kette, im wesentlichen parallel zur Ebene der Klappe (14) verläuft.
EP09290003.4A 2008-01-07 2009-01-06 Mikromechanisch bearbeitete oder mikrogravierte Sicherungs- und Scharfstellungsvorrichtung Active EP2077431B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09290003T PL2077431T3 (pl) 2008-01-07 2009-01-06 Mikroobrabiane lub mikrograwerowane urządzenie zabezpieczające i uzbrajające

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0800069A FR2926134B1 (fr) 2008-01-07 2008-01-07 Dispositif de securite et d'armement micro-usine ou micro-grave

Publications (3)

Publication Number Publication Date
EP2077431A2 EP2077431A2 (de) 2009-07-08
EP2077431A3 EP2077431A3 (de) 2010-02-10
EP2077431B1 true EP2077431B1 (de) 2013-07-17

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EP09290003.4A Active EP2077431B1 (de) 2008-01-07 2009-01-06 Mikromechanisch bearbeitete oder mikrogravierte Sicherungs- und Scharfstellungsvorrichtung

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Country Link
US (1) US8166880B2 (de)
EP (1) EP2077431B1 (de)
ES (1) ES2429491T3 (de)
FR (1) FR2926134B1 (de)
PL (1) PL2077431T3 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2962209B1 (fr) 2010-07-02 2012-07-13 Nexter Munitions Reliefs anti adherence pour dispositif de securite et d'armement
FR2962210A1 (fr) 2010-07-02 2012-01-06 Nexter Munitions Dispositif de securite et d'armement a verrou inertiel de technologie mems
FR2965044B1 (fr) * 2010-09-22 2012-08-24 Nexter Munitions Dispositif de securite et d'armement pour projectile explosif gyrostabilise et dispositif d'amorcage mettant en oeuvre un tel dispositif de securite et d'armement
FR2971050B1 (fr) * 2011-01-31 2013-01-18 Nexter Munitions Dispositif de securite et d'armement pour une chaine pyrotechnique d'un projectile
FR2971049B1 (fr) 2011-01-31 2013-01-18 Nexter Munitions Dispositif de temporisation d'un mouvement d'une masselotte micro-usinee et dispositif de securite et d'armement comprenant un tel dispositif de temporisation
FR2971048B1 (fr) * 2011-01-31 2013-01-11 Nexter Munitions Dispositif de securite et d'armement a verrou cassable
US9220888B2 (en) 2012-04-02 2015-12-29 Medtronic, Inc. Medical leads
FR3058994B1 (fr) * 2016-11-21 2018-10-26 Safran Systeme d'amortissement pour une masse mobile d'un dispositif mems
CN112556518B (zh) * 2020-11-23 2022-03-22 南京理工大学 一种小口径弹药微流体引信安保机构

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Also Published As

Publication number Publication date
EP2077431A2 (de) 2009-07-08
US20090205526A1 (en) 2009-08-20
FR2926134B1 (fr) 2010-03-26
PL2077431T3 (pl) 2013-12-31
US8166880B2 (en) 2012-05-01
FR2926134A1 (fr) 2009-07-10
EP2077431A3 (de) 2010-02-10
ES2429491T3 (es) 2013-11-15

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