WO1985003345A1 - Percussion projectile electric rocket - Google Patents

Percussion projectile electric rocket Download PDF

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Publication number
WO1985003345A1
WO1985003345A1 PCT/CH1985/000006 CH8500006W WO8503345A1 WO 1985003345 A1 WO1985003345 A1 WO 1985003345A1 CH 8500006 W CH8500006 W CH 8500006W WO 8503345 A1 WO8503345 A1 WO 8503345A1
Authority
WO
WIPO (PCT)
Prior art keywords
generator
projectile
rocket
striker
voltage
Prior art date
Application number
PCT/CH1985/000006
Other languages
French (fr)
Inventor
Jean-Pierre Golay
Original Assignee
Mefina S.A.
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 Mefina S.A. filed Critical Mefina S.A.
Publication of WO1985003345A1 publication Critical patent/WO1985003345A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C11/00—Electric fuzes
    • F42C11/02—Electric fuzes with piezo-crystal

Definitions

  • Electric percussion projectile rockets comprising at least one striker, a generator and a device for igniting a detonator, the striker cooperating with the generator to supply it with the mechanical energy necessary for the production of a electric ignition voltage.
  • the generator can be of the piezoelectric or magnetic type and it is sought to avoid that an accidental firing of the projectile can occur, when the striker is accidentally moved, for example during transport.
  • the rockets are generally provided with a safety device released at the start of the blow. This type of safety device cannot, however, prevent an accidental firing of the projectile when it has not taken place on impact.
  • the object of the invention is to provide additional security against any accidental firing of an armed projectile.
  • the rocket according to the invention is characterized in that it comprises a circuit discriminating the slope of the rising edge of the voltage supplied by the generator, this circuit comprising at least one element disposed between the generator and the ignition device for prevent the application of the ignition voltage to this device when the front does not have a sufficient slope.
  • Figure 1 is a diagram illustrating the principle of the invention.
  • FIG. 2 is a longitudinal sectional view of the embodiment of the rocket.
  • a. generator G consists of a piezoelectric crystal 1, placed between two electrodes 2. This generator is intended to supply a voltage pulse under the effect of an abrupt mechanical deformation of crystal 1 at the time of impact.
  • the electrodes 2 are shunted by a self-induction coil 3, the terminals of which are connected to the primary winding of a transformer 4 via a spark gap 5.
  • the transformer 4 is a step-down transformer and its secondary is connected to an ignition device 6.
  • the deformation of crystal 1 is very abrupt, which provides a very fast rising edge voltage pulse.
  • the self-induction coil 3 has a high impedance, so that its presence can be practically neglected and that almost all of the energy supplied by the generator G is applied to the transformer 4. In fact, the energy lost in spark gap 5 is negligible.
  • the coil 3 has a low impedance for slow variations, so that such a voltage pulse causes a short-circuit current to flow in the coil 3.
  • the instantaneous voltage is limited to a value much lower than that required to produce a spark at the poles of the spark gap 5.
  • the projectile rocket comprises an annular piece 13 of steel, intended to be screwed to the front of the projectile.
  • This annular part 13 carries, on its side outside the body of the projectile, the generator G illustrated in FIG. 1.
  • the upper part of this part 13 is planar and serves to support one face of a crystal 1, the other of which face is in contact with a circular part 7 called hammer.
  • the parts 13 and 7 are metallic and play the role of the electrodes 2 of FIG. 1.
  • a high and brief pressure applied to the crystal 1 to obtain a voltage pulse with a rapidly rising edge.
  • the hammer 7 is pressed elastically against the crystal I by means of a striker 8 connected to an annular piece 9 of synthetic resin by means of a membrane 10 which allows axial movement of the striker 8 by compared to the whole head.
  • the inductor coil 3 Inside the room l is the inductor coil 3, the transformer 4, the spark gap 5 and the primer 6.
  • a pyrophoric chain disposed in a housing 12 which is capable of occupying a safety position and respectively an armed position. In the latter, the pyrophoric chain is capable of transmitting fire from the primer 6 to the detonator 11.
  • the step-down transformer must transmit pulses of very short duration, it can be constituted simply by two coaxial windings without iron carcass.
  • these two windings are carried on a coil, the central part of which constitutes a non-ferrous core for the said coils.
  • the secondary winding of the transformer 4 is connected by conductors not shown to electrical contacts to bring the ignition voltage to the primer with impedance base.
  • the striker acquires a high speed at the time of impact, a very high pressure is obtained, which is favorable from the point of view of the electric voltage supplied.
  • the masses displaceable during impact are limited to the mass of the striker, and that, on the other hand, the resin cap of the striker is relatively large, the firing device has a large sensitivity and can work during impacts on very soft ground, for example on loose snow.
  • spark gap 5 can be replaced by other elements with a conduction threshold, in particular by a Zener diode.
  • the pulse generator G could be an electromagnetic generator and, in this case, the transformer 4 could be omitted.
  • the generator impedance is well suited to that of the ignition device.
  • the transmission of the pulse from the generator to the ignition device could be controlled by a high-pass filter, which, in the diagram in FIG. 1, could be achieved by connecting one of the electrodes 2 to coil 3 via a capacitor.
  • the coil 3 could also be replaced by a semiconductor controlled by a circuit sensitive to the slope of the front of the voltage pulse and made conductive, respectively non-conductive, depending on whether this slope is lower or higher. to a predetermined value.

Abstract

The percussion projectile rocket comprises a generator (G) comprised of a piezoelectric crystal (1) intended to be deformed upon the impact of the projectile to produce a firing voltage which is transmitted to an ignition device (6) through a spark-gap arrester (5) and a transformer (4). A self-induction coil (3) shorts this voltage pulse when the rise leading edge of the pulse has not reached as high a value as that which is produced upon the normal impact of the projectile. Thereby, a safety protection against voltages susceptible of being accidentally produced by shocks to the projectile is obtained.

Description

Fusée électrique de projectile à percussion Percussion projectile electric rocket
On connaît déjà des fusées électriques de projectile à percussion, comprenant au moins un percuteur, un générateur et un dispositif d'allumage d'un détonateur, le percuteur coopérant avec le générateur pour lui fournir l'énergie mécanique nécessaire à la production d'une tension électrique d'allumage.Electric percussion projectile rockets are already known, comprising at least one striker, a generator and a device for igniting a detonator, the striker cooperating with the generator to supply it with the mechanical energy necessary for the production of a electric ignition voltage.
Dans ces fusées connues, le générateur peut être du type piézo-électrique ou magnétique et l'on cherche à éviter qu'une mise à feu accidentelle du projectile puisse se produire, lorsque le percuteur est déplacé accidentellement, par exemple lors du transport. A cet effet, les fusées sont généralement munies d'un dispositif de sécurité libéré au départ du coup. Ce genre de dispositif de sécurité ne peut toutefois pas empêcher une mise à feu accidentelle du projectile lorsqu'elle n'a pas eu lieu à l'impact.In these known rockets, the generator can be of the piezoelectric or magnetic type and it is sought to avoid that an accidental firing of the projectile can occur, when the striker is accidentally moved, for example during transport. For this purpose, the rockets are generally provided with a safety device released at the start of the blow. This type of safety device cannot, however, prevent an accidental firing of the projectile when it has not taken place on impact.
L'invention a pour but de réaliser une sécurité complémentaire contre toute mise à feu accidentelle d'un projectile armé.The object of the invention is to provide additional security against any accidental firing of an armed projectile.
La fusée selon l'invention est caractérisée en ce qu'elle comprend un circuit discriminateur de la pente du front de montée de la tension fournie par le générateur, ce circuit comprenant au moins un élément disposé entre le générateur et le dispositif d'allumage pour empêcher l'application de la tension d'allumage à ce dispositif lorsque le front ne présente pas une pente suffisante.The rocket according to the invention is characterized in that it comprises a circuit discriminating the slope of the rising edge of the voltage supplied by the generator, this circuit comprising at least one element disposed between the generator and the ignition device for prevent the application of the ignition voltage to this device when the front does not have a sufficient slope.
Le dessin annexé représente schématiquernent et à titre d'exemple une forme d'exécution de la fusée faisant l'objet de l'invention.The accompanying drawing shows schematically and by way of example an embodiment of the rocket which is the subject of the invention.
La figure 1 est un schéma illustrant le principe de l'invention.Figure 1 is a diagram illustrating the principle of the invention.
La figure 2 est une vue en coupe longitudinale de la forme d'exécution de la fusée. En référence à la figure 1, un. générateur G est constitué par un cristal piezo-électrique 1, disposé entre deux électrodes 2. Ce générateur est destiné à fournir une impulsion de tension sous l'effet d'une déformation mécanique brusque du cristal 1 au moment de l'impact. Les électrodes 2 sont shuntées par une bobine de self-induction 3, dont les bornes sont reliées à l'enroulement primaire d'un transformateur 4 par l'intermédiaire d'un éclateur 5. Le transformateur 4 est un tranformateur abaisseur de tension et son secondaire est connecté à un dispositif d'allumage 6.Figure 2 is a longitudinal sectional view of the embodiment of the rocket. Referring to Figure 1, a. generator G consists of a piezoelectric crystal 1, placed between two electrodes 2. This generator is intended to supply a voltage pulse under the effect of an abrupt mechanical deformation of crystal 1 at the time of impact. The electrodes 2 are shunted by a self-induction coil 3, the terminals of which are connected to the primary winding of a transformer 4 via a spark gap 5. The transformer 4 is a step-down transformer and its secondary is connected to an ignition device 6.
Lors de l'impact, la déformation du cristal 1 est très brusque, ce qui fournit une impulsion de tension à front de montée très rapide. Dans ces conditions, la bobine de self-induction 3 présente une impédance élevée, de sorte que sa présence peut être pratiquement négligée et que la quasi-totalité de l'énergie fournie par le générateur G est appliquée au transformateur 4. En effet, l'énergie perdue dans l'éclateur 5 est négligeable.Upon impact, the deformation of crystal 1 is very abrupt, which provides a very fast rising edge voltage pulse. Under these conditions, the self-induction coil 3 has a high impedance, so that its presence can be practically neglected and that almost all of the energy supplied by the generator G is applied to the transformer 4. In fact, the the energy lost in spark gap 5 is negligible.
Par contre, si la mise à feu du projectile n'a pas eu lieu à l'impact, un choc accidentel sur le percuteur fournirait une impulsion de tension à front de montée lent, beaucoup plus faible que dans le cas de son fonctionnement normal.On the other hand, if the firing of the projectile did not take place on impact, an accidental impact on the striker would provide a voltage pulse with a slow rising edge, much weaker than in the case of its normal operation.
La bobine 3 présente une impédance basse pour les variations lentes, de sorte qu'une telle impulsion de tension fait circuler un courant de court-circuit dans la bobine 3. De ce fait, la tension instantanée est limitée à une valeur beaucoup plus faible que celle nécessaire pour produire une étincelle aux pôles de l'éclateur 5.The coil 3 has a low impedance for slow variations, so that such a voltage pulse causes a short-circuit current to flow in the coil 3. As a result, the instantaneous voltage is limited to a value much lower than that required to produce a spark at the poles of the spark gap 5.
On obtient ainsi une sécurité totale contre l'explosion accidentelle d'un projectile dû à des chocs que ce dernier peut subir lors de sa manipulation.Total security is thus obtained against the accidental explosion of a projectile due to shocks that the latter may undergo during its handling.
En référence à 1a figure 2, la fusée de projectile comprend une pièce annulaire 13 en acier, destinée à être vissée à l'avant du projectile. Cette pièce annulaire 13 porte, sur son côté extérieur au corps du projectile, le générateur G illustré à 1a figure 1. La partie supérieure de cette pièce 13 est plane et sert d'appui à une face d'un cristal 1 dont l'autre face est en contact avec une pièce circulaire 7 dénommée marteau. Les pièces 13 et 7 sont métalliques et jouent le rôle des électrodes 2 de 1a figure 1. Lors de l'impact une pression élevée et brève et appliquée au cristal 1 pour obtenir une impulsion de tension à front de montée rapide. A cet effet, le marteau 7 est appuyé élastiquement contre le cristal I par l'intermédiaire d'un percuteur 8 relié à une pièce annulaire 9 en résine synthétique par l'intermédiaire d'une membrane 10 qui permet un déplacement axial du percuteur 8 par rapport à l'ensemble de la tête.With reference to FIG. 2, the projectile rocket comprises an annular piece 13 of steel, intended to be screwed to the front of the projectile. This annular part 13 carries, on its side outside the body of the projectile, the generator G illustrated in FIG. 1. The upper part of this part 13 is planar and serves to support one face of a crystal 1, the other of which face is in contact with a circular part 7 called hammer. The parts 13 and 7 are metallic and play the role of the electrodes 2 of FIG. 1. Upon impact, a high and brief pressure applied to the crystal 1 to obtain a voltage pulse with a rapidly rising edge. To this end, the hammer 7 is pressed elastically against the crystal I by means of a striker 8 connected to an annular piece 9 of synthetic resin by means of a membrane 10 which allows axial movement of the striker 8 by compared to the whole head.
A l'intérieur de la pièce l se trouve la bobine de self 3, le transformateur 4, l'éclateur 5 et l'amorce 6. Entre l'amorce 6 et un détonateur 11, destiné à allumer la charge du projectile, se trouve une chaîne pyrophorique disposée dans un boîtier 12 qui est susceptible d'occuper une position de sécurité et respectivement une position armée. Dans cette dernière, la chaîne pyrophorique est capable de transmettre le feu de l'amorce 6 jusqu'au détonateur 11.Inside the room l is the inductor coil 3, the transformer 4, the spark gap 5 and the primer 6. Between the primer 6 and a detonator 11, intended to ignite the charge of the projectile, is a pyrophoric chain disposed in a housing 12 which is capable of occupying a safety position and respectively an armed position. In the latter, the pyrophoric chain is capable of transmitting fire from the primer 6 to the detonator 11.
Grâce au fait que le transformateur abaisseur de tension doit transmettre des impulsions de durée très brève, il peut être constitué simplement par deux enroulement coaxiaux sans carcasse de fer. En principe, ces deux enroulements sont portés sur une bobine dont la partie centrale constitue un noyau non ferreux pour les dites bobines. L'enroulement secondaire du transformateur 4 est relié par des conducteurs non représentés à des contacts électriques pour amener la tension d'allumage à l'amorce à base impédance.Thanks to the fact that the step-down transformer must transmit pulses of very short duration, it can be constituted simply by two coaxial windings without iron carcass. In principle, these two windings are carried on a coil, the central part of which constitutes a non-ferrous core for the said coils. The secondary winding of the transformer 4 is connected by conductors not shown to electrical contacts to bring the ignition voltage to the primer with impedance base.
Lorsque le projectile atteint son but, le percuteur 8 est déplacé brusquement vers l'arrière et le marteau 7 transmet au cristal 1 l'onde de choc produite par le percuteur 8. Il en résulte une pression élevée et de courte durée sur le cristal avec production consécutive d'énergie électrique dans des conditions d'impédance élevée.When the projectile reaches its goal, the striker 8 is suddenly moved backwards and the hammer 7 transmits to the crystal 1 the shock wave produced by the striker 8. This results in high and short-term pressure on the crystal with consecutive production of electrical energy under high impedance conditions.
Grâce au fait que le percuteur acquiert une vitesse élevée au moment de l'impact, on obtient une pression très élevée, ce qui est favorable au point de vue de la tension électrique fournie. Comme, d'une part, les masses déplaçabies lors de l'impact sont limitées à la masse du percuteur, et que, d'autre part, la calotte en résine du percuteur est relativement grande, le dispositif de mise à feu présente une grande sensibilité et peut fonctionner lors des impacts sur sol très tendre, par exemple sur de la neige non tassée.Thanks to the fact that the striker acquires a high speed at the time of impact, a very high pressure is obtained, which is favorable from the point of view of the electric voltage supplied. As, on the one hand, the masses displaceable during impact are limited to the mass of the striker, and that, on the other hand, the resin cap of the striker is relatively large, the firing device has a large sensitivity and can work during impacts on very soft ground, for example on loose snow.
Bien entendu, on peut prévoir de nombreuses modifications au dispositif décrit. En particulier, l'éclateur 5 peut être remplacé par d'autres éléments à seuil de conduction, notamment par une diode Zener. Le générateur G d'impulsions pourrait être un générateur électro-magnétique et, dans ce cas, le transformateur 4 pourrait être supprimé. L'impédance du générateur est bien adapté à celle du dispositif d'allumage.Of course, many modifications can be made to the device described. In particular, the spark gap 5 can be replaced by other elements with a conduction threshold, in particular by a Zener diode. The pulse generator G could be an electromagnetic generator and, in this case, the transformer 4 could be omitted. The generator impedance is well suited to that of the ignition device.
Enfin, il est clair que la transmission de l'impulsion du générateur vers le dispositif d'allumage pourrait être contrôlée par un filtre passe-haut, ce qui, sur le schéma de la figure 1 pourrait être réalisé en reliant une des électrodes 2 à la bobine 3 par l'intermédiaire d'un condensateur. Il va de soi que la bobine 3 pourrait aussi être remplacée par un semi-conducteur commandé par un circuit sensible à la pente du front de l'impulsion de tension et rendu conducteur, respectivement non-conducteur, suivant que cette pente est inférieure ou supérieure à une valeur prédéterminée. Finally, it is clear that the transmission of the pulse from the generator to the ignition device could be controlled by a high-pass filter, which, in the diagram in FIG. 1, could be achieved by connecting one of the electrodes 2 to coil 3 via a capacitor. It goes without saying that the coil 3 could also be replaced by a semiconductor controlled by a circuit sensitive to the slope of the front of the voltage pulse and made conductive, respectively non-conductive, depending on whether this slope is lower or higher. to a predetermined value.

Claims

REVENDICATIONS
1. Fusée électrique de projectile à percussion, comprenant au moins un percuteur, un générateur et un dispositif d'allumage d'un détonateur, le percuteur coopérant avec le générateur pour lui fournir l'énergie mécanique nécessaire à la production d'une tension électrique d'allumage, caractérisée en ce qu'elle comprend un circuit discriminateur de la pente du front de montée de la tension fournie par le générateur, ce circuit comprenant au moins un élément disposé entre le générateur et le dispositif d'allumage pour empêcher l'application de la tension d'allumage à ce dispositif lorsque le front ne présente pas une pente suffisante.1. Electric percussion projectile rocket, comprising at least one striker, a generator and a device for igniting a detonator, the striker cooperating with the generator to supply it with the mechanical energy necessary for the production of an electrical voltage ignition, characterized in that it comprises a circuit discriminating the slope of the rising edge of the voltage supplied by the generator, this circuit comprising at least one element disposed between the generator and the ignition device to prevent application of the ignition voltage to this device when the front does not have a sufficient slope.
2. Fusée selon la revendication 1, caractérisée en ce que le circuit discriminateur comprend un shunt connecté entre les bornes du générateur.2. Rocket according to claim 1, characterized in that the discriminator circuit comprises a shunt connected between the terminals of the generator.
3. Fusée selon la revendication 2, caractérisée en ce que le shunt est constitué par une bobine de self-induction.3. Rocket according to claim 2, characterized in that the shunt is constituted by a self-induction coil.
4. Fusée selon 1a revendication 3, caractérisée en ce que le générateur est constitué par un cristal piezo-électrique placé entre deux électrodes reliées chacune à une borne de la bobine de self-induction, cette bobine étant reliée par l'intermédiaire d'un élément à seuil de conduction à l'enroulement primaire d'un transformateur dont le secondaire est connecté à une amorce électrique. 4. Rocket according to claim 3, characterized in that the generator consists of a piezoelectric crystal placed between two electrodes each connected to a terminal of the self-induction coil, this coil being connected via a element with conduction threshold at the primary winding of a transformer whose secondary is connected to an electrical primer.
PCT/CH1985/000006 1984-01-25 1985-01-21 Percussion projectile electric rocket WO1985003345A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH318/84A CH655791A5 (en) 1984-01-25 1984-01-25 Rocket power shot of percussion.
CH318/84-9 1984-01-25

Publications (1)

Publication Number Publication Date
WO1985003345A1 true WO1985003345A1 (en) 1985-08-01

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ID=4184286

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PCT/CH1985/000006 WO1985003345A1 (en) 1984-01-25 1985-01-21 Percussion projectile electric rocket

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CH (1) CH655791A5 (en)
ES (1) ES539818A0 (en)
IT (2) IT8552885V0 (en)
WO (1) WO1985003345A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020746A1 (en) * 1994-01-27 1995-08-03 Tpp Technological Industries Ltd. Autonomous electric detonator
EP1878995A2 (en) 2006-07-13 2008-01-16 NEXTER Munitions Percussion fuse with piezoelectric generator
CN108613598A (en) * 2016-12-12 2018-10-02 南京理工大学 Piezoelectricity ignition propellant actuated device for fuse arming

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2122692A5 (en) * 1971-01-20 1972-09-01 Thomson Csf
US4140062A (en) * 1955-02-16 1979-02-20 The United States Of America As Represented By The Secretary Of The Army Differential integrator
US4215633A (en) * 1978-06-05 1980-08-05 The United States Of America As Represented By The Secretary Of The Navy Acoustic emission contact fuze with signal processing capability
GB2056028A (en) * 1979-08-04 1981-03-11 Diehl Gmbh & Co Detonator without initiating explosive
US4434717A (en) * 1981-08-21 1984-03-06 The United States Of America As Represented By The Secretary Of The Navy Hybrid fuse triggering device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140062A (en) * 1955-02-16 1979-02-20 The United States Of America As Represented By The Secretary Of The Army Differential integrator
FR2122692A5 (en) * 1971-01-20 1972-09-01 Thomson Csf
US4215633A (en) * 1978-06-05 1980-08-05 The United States Of America As Represented By The Secretary Of The Navy Acoustic emission contact fuze with signal processing capability
GB2056028A (en) * 1979-08-04 1981-03-11 Diehl Gmbh & Co Detonator without initiating explosive
US4434717A (en) * 1981-08-21 1984-03-06 The United States Of America As Represented By The Secretary Of The Navy Hybrid fuse triggering device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020746A1 (en) * 1994-01-27 1995-08-03 Tpp Technological Industries Ltd. Autonomous electric detonator
EP1878995A2 (en) 2006-07-13 2008-01-16 NEXTER Munitions Percussion fuse with piezoelectric generator
FR2903772A1 (en) * 2006-07-13 2008-01-18 Giat Ind Sa IMPACT FUSE WITH PIEZOELECTRIC GENERATOR.
EP1878995A3 (en) * 2006-07-13 2008-08-27 NEXTER Munitions Percussion fuse with piezoelectric generator
US7661363B2 (en) 2006-07-13 2010-02-16 Nexter Munitions Impact fuse
CN108613598A (en) * 2016-12-12 2018-10-02 南京理工大学 Piezoelectricity ignition propellant actuated device for fuse arming

Also Published As

Publication number Publication date
IT8552885V0 (en) 1985-01-23
CH655791A5 (en) 1986-05-15
IT8567060A0 (en) 1985-01-23
ES8608151A1 (en) 1985-11-01
ES539818A0 (en) 1985-11-01

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