EP0206978B1 - Impact fuze for a projectile - Google Patents

Impact fuze for a projectile Download PDF

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Publication number
EP0206978B1
EP0206978B1 EP86810158A EP86810158A EP0206978B1 EP 0206978 B1 EP0206978 B1 EP 0206978B1 EP 86810158 A EP86810158 A EP 86810158A EP 86810158 A EP86810158 A EP 86810158A EP 0206978 B1 EP0206978 B1 EP 0206978B1
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EP
European Patent Office
Prior art keywords
drum
spring
projectile
timing mechanism
moveable member
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.)
Expired
Application number
EP86810158A
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German (de)
French (fr)
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EP0206978A1 (en
Inventor
Jean-Pierre Golay
Pierre Luc Gagnebin
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Mefina SA
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Mefina SA
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Publication date
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Publication of EP0206978A1 publication Critical patent/EP0206978A1/en
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Publication of EP0206978B1 publication Critical patent/EP0206978B1/en
Expired legal-status Critical Current

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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
    • F42C15/44—Arrangements for disarming, or for rendering harmless, fuzes after arming, e.g. after launch

Definitions

  • a percussion projectile rocket comprising a striker and a pyrotechnic chain leading to a detonator, the whole being arranged to ignite the projectile upon impact, at least one moving part acting between the striker and the detonator for prevent firing before the start of the blow and for a period corresponding to safety of mouth after the start of the blow, means causing a displacement of this moving part to bring it into an active position allowing firing during impact, a time delay device acting on this same moving part to then move it away from its position allowing firing and bringing it into an inactive position for which firing is no longer possible, the rocket comprising also a motor spring, one end of which acts on the moving part (see CH-A 199 818).
  • the moving part is biased by a spring and is engaged with a timer which slows down its movement.
  • This moving part is constituted by a rotating disc which performs only a fraction of a turn between its initial safety position and its final safety position.
  • This disc is arranged in the path of the striker to prevent its movement towards the detonator, but has an arcuate slot through which the striker can pass for the duration of the active position.
  • the transition from the initial safety position to the active position is done gradually, which gives an area of uncertainty from the start of the active position.
  • the invention aims to avoid this area of uncertainty.
  • the rocket according to the invention is characterized in that the other end acts on the timing device, means for locking the moving part being brought into the unlocking position by the timing device.
  • a projectile 1 is provided at its front part with a rocket 2 which comprises a body 3 screwed into a bore at the end of the projectile.
  • the front part of the body 3 comprises a percussion head 4 covered by a cap 5 and connected to a striker 6.
  • This head is urged forward by a spring 7 bearing on a cylindrical part 8.
  • the rod of the striker passes through a box 9 containing a mechanical safety device intended to prevent any movement of the striker before the projectile is loaded into a weapon.
  • This safety device is not part of the invention and will not be described in detail, because it can be of any known type.
  • the tip of the striker 6 is disposed opposite a primer 10 disposed in a part 11.
  • the primer 10 is connected to a detonator 12 by a pyrotechnic chain which is not shown in detail, because this is a provision well known in itself.
  • the detonator 12 is intended to produce the firing of the charge 13 of the projectile.
  • a housing 14 contains a safety device preventing the initiation of ignition of the detonator until the projectile has left its weapon.
  • This device comprises a moving part which creates a break in the pyrotechnic chain between the primer and the detonator, either by interposing a fire-resistant shutter placed in the path of the chain, or by distancing an element of the chain pyrotechnic.
  • the safety device placed in the housing 14 is locked in its safety position by a bar 15 retained in position by an elastic notch 16, adjusted so as to give way during the acceleration that the projectile undergoes in the weapon upon departure. therefore.
  • FIGS 2 to 4 show the safety device of the housing 14.
  • This device comprises a rotary drum 17 mounted rotating on a pivot 18, which can pivot itself between two plates 19 and 20.
  • This pivot 18 carries two toothed wheels 21 and 22, the first of which 21 is engaged with a toothed wheel 23 of a locking device which will be described later.
  • the toothed wheel 22 is engaged with a train - of multiplying gears, these gears being disposed between the plate 20 and the upper plate 24.
  • This gear train ends in a manner known per se to an exhaust mechanism 25, 26.
  • the drum has a part forming a barrel 27 coaxial with its pivot axis on the pivot 18 and housing a spiral spring 28.
  • the latter is attached by one of its ends 29 to the barrel and by its other end 30 to the pivot 18. It exerts therefore a torque in one direction on the pivot 18 and in the other direction on the drum 17.
  • the latter comprises a recess 31 intended to contain an element of the pyrotechnic chain. In the position illustrated in FIG. 4, this element of the chain is in a position which does not allow it to transmit the ignition of the primer 10 to the detonator 12.
  • the bar 15, illustrated in FIG. 1, crosses a gear wheel 32 of the gear train and thus blocks the latter, which constitutes with the exhaust parts 25 and 26 a time delay device.
  • the bar 15 is also engaged in a notch 33 provided in the periphery of the drum 17.
  • This drum also has a boss 34 which is intended to cooperate with a collar 35 integral in rotation with a pivot 37 bearing the toothed wheel 23 and having a flat 36, this assembly constituting a locking device.
  • the toothed wheel 32 is fixed on a pivot 38 having a notch 39 and intended to cooperate with a projection 40 provided inside the barrel 27.
  • the device works as follows:
  • the spring 28 is banded so as to urge the drum 17 anticlockwise to bring it into its active position.
  • this displacement is not possible, because the projection 40 of the barrel abuts against the pivot 38, which is retained in angular position by the bar 15 passing through the toothed wheel 32.
  • the pivot 38 has made a rotation of a quarter turn, its notch 39 releases the projection 40 and the drum 17 rotates under the action of the spring 28 worth approximately half a turn until its boss 34 abuts against the collar 35 of the pivot 37.
  • the element of the pyrotechnic chain which is placed in the recess 31 of said drum, is in the active position to transmit the firing of the primer 10 to the detonator 12.
  • the time necessary for the wheel 32 to release the drum 17 is chosen so as to ensure muzzle safety, that is to say to prevent the firing of the projectile in the event that it comes to touch an object in the first 50 to 100 meters of the trajectory of the projectile.
  • the spring 28 continues to relax by operating the exhaust 25, 26 and by rotating the pivot 37 in an anticlockwise direction.
  • the rotation of the pivot 18 continues, of course only in the case where the projectile has not exploded.
  • the drum 17 resumes its rotation until the boss comes into contact with a stop 41. At this time, it is in a position where communication pyrotechnic between the primer 10 and the detonator 12 is interrupted. The danger of an accidental explosion of the projectile when handling a misfire is thus eliminated.
  • Figures 5 and 6 relate to an alternative embodiment in which there is the drum 17, its pivot 18 and the entire gear train ensuring the braking of the movement of the pivot 18 by the exhaust device 25, 26.
  • This part of the mechanism operates in the same way as in the case of the embodiment according to FIGS. 2 to 4.
  • the mechanism causing the second part of the angular displacement of the drum 17 is modified. It is replaced by a spring device intended to return the drum 17 to its initial position after it has occupied its active position allowing the firing of the projectile.
  • This spring device consists of a pivot 42 carrying a toothed wheel 43 which meshes with a toothed crown 44, integral with the barrel 27.
  • the pivot 42 is surrounded by a spring 45 attached to a stud 46 of the plate 20.
  • the spring 45 is only slightly tensioned so that the torque which it exerts on the drum 17, by means of the gears 43 and 44, is much weaker and directed in the opposite direction than the torque exerted by the spring 28 of the barrel.
  • the drum 17 is released, caused by the rotation of the pivot 38 cooperating with the projection 40, the drum 17 is placed in its active position by rotating the pivot 42 and further tensioning the spring 45.
  • the active position of the drum 17 is obtained by a slot 47 wider than the diameter of the pivot 38 and by the stop obtained by the end 48 of this slot against the pivot 38, after a rotation of about half a turn.

Abstract

1. A percussion fuze for a projectile comprising a percussion member (6) and a pyrotechnic fuse (10) terminating in a detonator (12), the whole being adapted to detonate the projectile on impact, at least one moveable member (17) acting between the percussion member (6) and the detonator (12) so as to prevent detonation prior to the projectile being fired and during a period of time corresponding to safety at the firing point after firing, means (28) for causing the said moveable member (17) to be displaced into an arming position such as to permit detonation on impact, a timing mechanism (25, 26) for acting on the said moveable member (17) whereby subsequently to move it from its armed position and to place it in an inactive position in which detonation is no longer possible, the fuze further comprising a drive spring (28), one end (30) of which acts on the moveable member (17), characterised in that the other end (29) acts on the timing mechanism (25, 26), means (34, 37) for locking the said moveable member (17) being set in an unlocking position by the timing mechanism (25, 26).

Description

On connaît déjà une fusée de projectile a percussion comprenant un percuteur et une chaîne pyrotechnique aboutissant à un détonateur, le tout étant agencé pour mettre à feu le projectile lors de l'impact, au moins une pièce mobile agissant entre le percuteur et le détonateur pour empêcher la mise à feu avant le départ du coup et pendant une durée correspondant à la sécurité de bouche après le départ du coup, des moyens provoquant un déplacement de cette pièce mobile pour l'amener dans une position active permettant la mise à feu lors de l'impact, un dispositif de temporisation agissant sur cette même pièce mobile pour l'éloigner ensuite de sa position permettant la mise à feu et l'amener dans une position inactive pour laquelle la mise à feu n'est plus possible, la fusée comprenant également un ressort moteur dont une extrémité agit sur la pièce mobile (voir CH-A 199 818).A percussion projectile rocket is already known comprising a striker and a pyrotechnic chain leading to a detonator, the whole being arranged to ignite the projectile upon impact, at least one moving part acting between the striker and the detonator for prevent firing before the start of the blow and for a period corresponding to safety of mouth after the start of the blow, means causing a displacement of this moving part to bring it into an active position allowing firing during impact, a time delay device acting on this same moving part to then move it away from its position allowing firing and bringing it into an inactive position for which firing is no longer possible, the rocket comprising also a motor spring, one end of which acts on the moving part (see CH-A 199 818).

Dans cette construction connue, la pièce mobile est sollicitée par un ressort et est en prise avec un temporisateur qui freine son déplacement. Cette pièce mobile est constituée par un disque rotatif qui n'effectue qu'une fraction de tour entre sa position de sécurité initiale et sa position de sécurité finale. Ce disque est dispose sur le trajet du percuteur pour interdire son déplacement vers le détonateur, mais présente une fente arquée a travers laquelle le percuteur peut passer pendant la durée de la position active. Dans une telle construction, le passage de la position de sécurité initiale à la position active se fait progressivement, ce qui donne une zone d'incertitude du début de la position active.In this known construction, the moving part is biased by a spring and is engaged with a timer which slows down its movement. This moving part is constituted by a rotating disc which performs only a fraction of a turn between its initial safety position and its final safety position. This disc is arranged in the path of the striker to prevent its movement towards the detonator, but has an arcuate slot through which the striker can pass for the duration of the active position. In such a construction, the transition from the initial safety position to the active position is done gradually, which gives an area of uncertainty from the start of the active position.

L'invention a pour but d'éviter cette zone d'incertitude.The invention aims to avoid this area of uncertainty.

A cet effet, la fusée selon l'invention est caractérisée en ce que l'autre extrémité agit sur le dispositif de temporisation, des moyens de verrouillage de la pièce mobile étant amenés en position de déverrouillage par le dispositif de temporisation.To this end, the rocket according to the invention is characterized in that the other end acts on the timing device, means for locking the moving part being brought into the unlocking position by the timing device.

Le dessin annexé représente schématiquement et à titre d'exemple une forme d'exécution et une variante de la fusée faisant l'objet de l'invention.

  • La figure 1 est une coupe de l'extrémité d'un projectile muni d'une fusée.
  • La figure 2 est une vue générale avec arrachement partiel d'un dispositif de temporisation.
  • La figure 3 montre un détail de la figure 2.
  • La figure 4 est une coupe développée de la figure 2.
  • La figure 5 correspond à la figure 2 et se rapporte à une variante d'exécution.
  • La figure 6 est une coupe développée de cette variante.
The accompanying drawing shows schematically and by way of example an embodiment and a variant of the rocket which is the subject of the invention.
  • Figure 1 is a section through the end of a projectile provided with a rocket.
  • Figure 2 is a general view with partial cutaway of a timing device.
  • Figure 3 shows a detail of Figure 2.
  • FIG. 4 is a section developed from FIG. 2.
  • Figure 5 corresponds to Figure 2 and relates to an alternative embodiment.
  • Figure 6 is an expanded section of this variant.

En référence à la figure 1, un projectile 1 est muni à sa partie avant d'une fusée 2 qui comprend un corps 3 vissé dans un alésage de l'extrémité du projectile. La partie avant du corps 3 comprend une tête de percussion 4 recouverte par un capuchon 5 et reliée à un percuteur 6. Cette tête est sollicitée vers l'avant par un ressort 7 prenant appui sur une pièce cylindrique 8. La tige du percuteur traverse un boîtier 9 contenant un dispositif de sécurité mécanique destiné à empêcher tout mouvement du percuteur avant le chargement du projectile dans une arme. Ce dispositif de sécurité ne fait pas partie de l'invention et ne sera pas décrit en détail, car il peut être de tout type connu.Referring to Figure 1, a projectile 1 is provided at its front part with a rocket 2 which comprises a body 3 screwed into a bore at the end of the projectile. The front part of the body 3 comprises a percussion head 4 covered by a cap 5 and connected to a striker 6. This head is urged forward by a spring 7 bearing on a cylindrical part 8. The rod of the striker passes through a box 9 containing a mechanical safety device intended to prevent any movement of the striker before the projectile is loaded into a weapon. This safety device is not part of the invention and will not be described in detail, because it can be of any known type.

La pointe du percuteur 6 est disposée en regard d'une amorce 10 disposée dans une pièce 11. L'amorce 10 est reliée à un détonateur 12 par une chaîne pyrotechnique qui n'est représentée en détail, car il s'agit là d'une disposition bien connue en elle-même. Le détonateur 12 est destiné à produire la mise à feu de la charge 13 du projectile. Un boîtier 14 contient un dispositif de sûreté empêchant l'amorce d'allumer le détonateur tant que le projectile n'a pas quitté son arme. Ce dispositif comprend une pièce mobile qui crée une rupture dans la chaîne pyrotechnique entre l'amorce et le détonateur, soit par interposition d'un volet anti-feu disposé sur le chemin de la chaîne, soit par éloignement d'un élément de la chaîne pyrotechnique. Le dispositif de sûreté placé dans le boîtier 14 est verrouillé dans sa position de sûreté par une barrette 15 retenue en position par un cran élastique 16, réglé de façon à céder lors de l'accélération que le projectile subit dans l'arme lors du départ du coup.The tip of the striker 6 is disposed opposite a primer 10 disposed in a part 11. The primer 10 is connected to a detonator 12 by a pyrotechnic chain which is not shown in detail, because this is a provision well known in itself. The detonator 12 is intended to produce the firing of the charge 13 of the projectile. A housing 14 contains a safety device preventing the initiation of ignition of the detonator until the projectile has left its weapon. This device comprises a moving part which creates a break in the pyrotechnic chain between the primer and the detonator, either by interposing a fire-resistant shutter placed in the path of the chain, or by distancing an element of the chain pyrotechnic. The safety device placed in the housing 14 is locked in its safety position by a bar 15 retained in position by an elastic notch 16, adjusted so as to give way during the acceleration that the projectile undergoes in the weapon upon departure. therefore.

Les figures 2 à 4 représentent le dispositif de sûreté du boîtier 14. Ce dispositif comprend un tambour rotatif 17 monté tournant sur un pivot 18, lequel peut pivoter lui-même entre deux platines 19 et 20. Ce pivot 18 porte deux roues dentées 21 et 22 dont la première 21 est en prise avec une roue dentée 23 d'un dispositif de verrouillage qui sera décrit plus loin. La roue dentée 22 est en prise avec un train- - d'engrenages multiplicateur, ces engrenages étant disposés entre la platine 20 et la platine supérieure 24. Ce train d'engrenages aboutit de façon connue en soi à un mécanisme d'échappement 25, 26.Figures 2 to 4 show the safety device of the housing 14. This device comprises a rotary drum 17 mounted rotating on a pivot 18, which can pivot itself between two plates 19 and 20. This pivot 18 carries two toothed wheels 21 and 22, the first of which 21 is engaged with a toothed wheel 23 of a locking device which will be described later. The toothed wheel 22 is engaged with a train - of multiplying gears, these gears being disposed between the plate 20 and the upper plate 24. This gear train ends in a manner known per se to an exhaust mechanism 25, 26.

Le tambour présente une partie formant un barillet 27 coaxial à son axe de pivotement sur le pivot 18 et abritant un ressort spiral 28. Ce dernier est attaché par une de ses extrémités 29 au barillet et par son autre extrémité 30 au pivot 18. Il exerce donc un couple dans un sens sur le pivot 18 et dans l'autre sens sur le tambour 17. Ce dernier comprend un évidement 31 destiné à contenir un élément de la chaîne pyrotechnique. Dans la position illustrée à la figure 4, cet élément de la chaîne se trouve dans une position ne lui permettant pas de transmettre la mise à feu de l'amorce 10 au détonateur 12. La barrette 15, illustrée à la figure 1, traverse une roue dentée 32 du train d'engrenages et bloque ainsi ce dernier, qui constitue avec les pièces d'échappement 25 et 26 un dispositif de temporisation. Il y a lieu de remarquer que la barrette 15 est également engagée dans une encoche 33 prévue dans le pourtour du tambour 17. Ce tambour présente encore un bossage 34 qui est destiné à coopérer avec un collier 35 solidaire en rotation d'un pivot 37 portant la roue dentée 23 et présentant un méplat 36, cet ensemble constituant un dispositif de verrouillage. La roue dentée 32 est fixée sur un pivot 38 présentant une encoche 39 et destinée à coopérer avec une saillie 40 prévue à l'intérieur du barillet 27.The drum has a part forming a barrel 27 coaxial with its pivot axis on the pivot 18 and housing a spiral spring 28. The latter is attached by one of its ends 29 to the barrel and by its other end 30 to the pivot 18. It exerts therefore a torque in one direction on the pivot 18 and in the other direction on the drum 17. The latter comprises a recess 31 intended to contain an element of the pyrotechnic chain. In the position illustrated in FIG. 4, this element of the chain is in a position which does not allow it to transmit the ignition of the primer 10 to the detonator 12. The bar 15, illustrated in FIG. 1, crosses a gear wheel 32 of the gear train and thus blocks the latter, which constitutes with the exhaust parts 25 and 26 a time delay device. It should be noted that the bar 15 is also engaged in a notch 33 provided in the periphery of the drum 17. This drum also has a boss 34 which is intended to cooperate with a collar 35 integral in rotation with a pivot 37 bearing the toothed wheel 23 and having a flat 36, this assembly constituting a locking device. The toothed wheel 32 is fixed on a pivot 38 having a notch 39 and intended to cooperate with a projection 40 provided inside the barrel 27.

Le dispositif fonctionne comme suit:The device works as follows:

A la fabrication, le ressort 28 est bandé de façon à solliciter le tambour 17 dans le sens inverse des aiguilles d'une montre pour l'amener dans sa position active. Toutefois, ce déplacement n'est pas possible, car la saille 40 du barillet vient buter contre le pivot 38, lequel est retenu en position angulaire par la barrette 15 traversant la roue dentée 32.During manufacture, the spring 28 is banded so as to urge the drum 17 anticlockwise to bring it into its active position. However, this displacement is not possible, because the projection 40 of the barrel abuts against the pivot 38, which is retained in angular position by the bar 15 passing through the toothed wheel 32.

Au départ du coup, la barrette 15 se déplace par inertie vers l'arrière du projectile et contre l'action du cran élastique 16. Ce déplacement libère ainsi la roue 32 et supprime le verrouillage du tambour 17 par la barrette 15. Toutefois, ce dernier est retenu en rotation par sa saillie 40.At the start of the blow, the bar 15 moves by inertia towards the rear of the projectile and against the action of the elastic catch 16. This movement thus releases the wheel 32 and removes the locking of the drum 17 by the bar 15. However, this the latter is retained in rotation by its projection 40.

Le pivot 18, avec les roues dentées 21, 22, 23 et 32, commence à tourner, sa rotation étant freinée par le dispositif d'échappement 25, 26. Lorque le pivot 38 a effectué une rotation d'un quart de tour, son encoche 39 libère la saillie 40 et le tambour 17 tourne sous l'action du ressort 28 d'une valeur d'environ un demi tour jusqu'à ce que son bossage 34 vienne buter contre le collier 35 du pivot 37. A ce moment, l'élément de la chaîne pyrotechnique, qui est placé dans l'évidement 31 dudit tambour, se trouve en position active pour transmettre la mise à feu de l'amorce 10 au détonateur 12.The pivot 18, with the toothed wheels 21, 22, 23 and 32, begins to rotate, its rotation being braked by the exhaust device 25, 26. When the pivot 38 has made a rotation of a quarter turn, its notch 39 releases the projection 40 and the drum 17 rotates under the action of the spring 28 worth approximately half a turn until its boss 34 abuts against the collar 35 of the pivot 37. At this time, the element of the pyrotechnic chain, which is placed in the recess 31 of said drum, is in the active position to transmit the firing of the primer 10 to the detonator 12.

Le temps nécessaire à la roue 32 pour libérer le tambour 17 est choisi de façon à assurer une sécurité de bouche, c'est-à-dire d'empêcher la mise à feu du projectile dans le cas où il viendrait à toucher un objet dans les 50 à 100 premiers mètres de la trajectoire du projectile.The time necessary for the wheel 32 to release the drum 17 is chosen so as to ensure muzzle safety, that is to say to prevent the firing of the projectile in the event that it comes to touch an object in the first 50 to 100 meters of the trajectory of the projectile.

Pendant la trajectoire et jusqu'à l'impact, le ressort 28 continue à se détendre en faisant fonctionner l'échappement 25, 26 et en faisant tourner le pivot 37 en sens inverse des aiguilles d'une montre. Après un temps qui est choisi plus long que celui de la trajectoire du projectile, la rotation du pivot 18 se poursuit, bien entendu seulement dans le cas où le projectile n'a pas explosé. Lorsque le méplat 36 du collier 35 a suffisamment tourné pour libérer le bossage 34, le tambour 17 reprend sa rotation jusqu'à ce que le bossage vienne en contact avec une butée 41. A ce moment, il se trouve dans une position où la communication pyrotechnique entre l'amorce 10 et le détonateur 12 est interrompue. Le danger d'une explosion accidentelle du projectile lors de la manipulation d'un raté est ainsi écarté.During the trajectory and until impact, the spring 28 continues to relax by operating the exhaust 25, 26 and by rotating the pivot 37 in an anticlockwise direction. After a time which is chosen to be longer than that of the trajectory of the projectile, the rotation of the pivot 18 continues, of course only in the case where the projectile has not exploded. When the flat 36 of the collar 35 has rotated enough to release the boss 34, the drum 17 resumes its rotation until the boss comes into contact with a stop 41. At this time, it is in a position where communication pyrotechnic between the primer 10 and the detonator 12 is interrupted. The danger of an accidental explosion of the projectile when handling a misfire is thus eliminated.

Les figures 5 et 6 se rapportent à une variante d'exécution dans laquelle on retrouve le tambour 17, son pivot 18 et tout le train d'engrenages assurant le freinage du mouvement du pivot 18 par le dispositif d'échappement 25, 26. Cette partie du mécanisme fonctionne de la même façon que dans le cas de la forme d'exécution selon les figures 2 à 4. Par contre, le mécanisme provoquant la seconde partie du déplacement angulaire du tambour 17 est modifié. Elle est remplacée par un dispositif à ressort destiné à ramener le tambour 17 dans sa position initiale après qu'il a occupé sa position active permettant la mise à feu du projectile.Figures 5 and 6 relate to an alternative embodiment in which there is the drum 17, its pivot 18 and the entire gear train ensuring the braking of the movement of the pivot 18 by the exhaust device 25, 26. This part of the mechanism operates in the same way as in the case of the embodiment according to FIGS. 2 to 4. On the other hand, the mechanism causing the second part of the angular displacement of the drum 17 is modified. It is replaced by a spring device intended to return the drum 17 to its initial position after it has occupied its active position allowing the firing of the projectile.

Ce dispositif à ressort est constitué par un pivot 42 portant une roue dentée 43 qui engrène avec une couronne dentée 44, solidaire du barillet 27. Le pivot 42 est entouré par un ressort 45 accroché à un téton 46 de la platine 20.This spring device consists of a pivot 42 carrying a toothed wheel 43 which meshes with a toothed crown 44, integral with the barrel 27. The pivot 42 is surrounded by a spring 45 attached to a stud 46 of the plate 20.

Au départ du coup, le ressort 45 n'est que peu tendu de sorte que le couple qu'il exerce sur le tambour 17, par l'intermédiaire des engrenages 43 et 44, est beaucoup plus faible et dirigé en sens contraire que le couple exercé par le ressort 28 du barillet. Lors de la libération du tambour 17, provoquée par la rotation du pivot 38 coopérant avec la saillie 40, le tambour 17 se place dans sa position active en faisant tourner le pivot 42 et en tendant davantage le ressort 45. La position active du tambour 17 est obtenue grâce à une fente 47 plus large que le diamètre du pivot 38 et par la butée obtenue par l'extrémité 48 de cette fente contre le pivot 38, après une rotation d'un demi tour environ. Dans le cas où la mise à feu n'a pas eu lieu, le ressort 28 du barillet continue à se détendre en faisant fonctionner le dispositif d'échappement 25, 26, le couple exercé par ce ressort 28 sur le tambour 17 diminue progressivement et lorsqu'il devient inférieur à celui exercé par le ressort 45, ce dernier vient tourner le tambour 17 dans le sens des aiguilles d'une montre pour le ramener dans la position de la figure 5 ou tout au moins dans une position proche de celle-ci dans le cas où le pivot 38 occuperait une position ne permettant pas le passage de la saillie 40.At the start of the blow, the spring 45 is only slightly tensioned so that the torque which it exerts on the drum 17, by means of the gears 43 and 44, is much weaker and directed in the opposite direction than the torque exerted by the spring 28 of the barrel. When the drum 17 is released, caused by the rotation of the pivot 38 cooperating with the projection 40, the drum 17 is placed in its active position by rotating the pivot 42 and further tensioning the spring 45. The active position of the drum 17 is obtained by a slot 47 wider than the diameter of the pivot 38 and by the stop obtained by the end 48 of this slot against the pivot 38, after a rotation of about half a turn. In the event that the ignition has not taken place, the spring 28 of the barrel continues to relax by operating the exhaust device 25, 26, the torque exerted by this spring 28 on the drum 17 gradually decreases and when it becomes lower than that exerted by the spring 45, the latter turns the drum 17 clockwise to bring it back to the position of FIG. 5 or at least in a position close to it. in the case where the pivot 38 occupies a position that does not allow the projection of the projection 40.

Claims (6)

1. A percussion fuze for a projectile comprising a percussion member (6) and a pyrotechnic fuse (10) terminating in a detonator (12), the whole being adapted to detonate the projectile on impact, at least one moveable member (17) acting between the percussion member (6) and the detonator (12) so as to prevent detonation prior to the projectile being fired and during a period of time corresponding to safety at the firing point after firing, means (28) for causing the said moveable member (17) to be displaced into an arming position such as to permit detonation on impact, a timing mechanism (25, 26) for acting on the said moveable member (17) whereby subsequently to move it from its armed position and to place it in an inactive position in which detonation is no longer possible, the fuze further comprising a drive spring (28), one end (30) of which acts on the moveable member (17), characterised in that the other end (29) acts on the timing mechanism (25, 26), means (34, 37) for locking the said moveable member (17) being set in an unlocking position by the timing mechanism (25, 26).
2. A fuze according to Claim 1, characterised in that the said moveable member is a rotatable drum (17), having a portion constituting a barrel (27) coaxial with the pivot axis of the drum (17) and surrounding the spring (28), the latter (28) being fixed by one (29) of its ends to the barrel (27) and by its other end (30) to a rotatable shaft (18) carrying a toothed wheel (22) meshing with the timing mechanism (25, 26).
3. A fuze according to Claim 2, characterised in that the rotatable drum (17) is biassed towards its arming position by the said spring (28), with locking means (38-40), which are provided between the timing mechanism (25, 26) and the drum (17), retaining the latter in its initial safe position, the said means (38-40) being set to their unlocking position by the timing mechanism.
4. A fuze according to Claim 3, characterised in that abutment means (34-37) controlled by the timer are arranged to hold the drum (17) in its arming position after it has been unlocked, and to maintain it in that position for a period of time greater than that of the normal trajectory of the projectile, the said abutment means (34-37) being then retracted by action of the timing mechanism (25, 26) so as to allow the drum (17) to continue its rotation whereby to be placed in its inactive position.
5. A fuze according to Claim 3, characterised in that the arming position of the drum (17) is determined by fixed abutment means (38, 48), with a second spring (45) acting on the drum (17) to bias it in a direction opposed to that of the first spring (28), the torque exerted by the second spring (45) on the drum (17) being smaller than the initial torque due to the first spring (28), but greater than the final torque due to the first spring (28) when it is relaxed in operation of the timing mechanism (25, 26), whereby to return the drum (17) into its initial safe position.
6. A fuze according to Claim 5, characterised in that the second spring (45) acts on a shaft (42) having a toothed portion (43) engaging with a corresponding toothed portion (44) of the drum (17), the said second spring (45) being substantially relaxed in the initial safe position of the fuze, the displacement of the drum (17) from its initial safe position to its arming position causing the shaft (42) to rotate and the second spring (45) to be tensioned.
EP86810158A 1985-06-06 1986-04-02 Impact fuze for a projectile Expired EP0206978B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH239385A CH661169GA3 (en) 1985-06-06 1985-06-06
CH2393/85 1985-06-06

Publications (2)

Publication Number Publication Date
EP0206978A1 EP0206978A1 (en) 1986-12-30
EP0206978B1 true EP0206978B1 (en) 1989-10-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810158A Expired EP0206978B1 (en) 1985-06-06 1986-04-02 Impact fuze for a projectile

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EP (1) EP0206978B1 (en)
CH (1) CH661169GA3 (en)
DE (1) DE3666503D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO891579L (en) * 1988-05-16 1989-11-17 Oerlikon Buehrle Ag BLIND WIRE INSERT FOR A PROJECT LIGHTER.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE428837A (en) * 1937-06-30
US3107618A (en) * 1961-10-27 1963-10-22 James L Vanover De-arming device
DE2423912C3 (en) * 1974-05-16 1978-11-16 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Restoration facility for mines
SE428725B (en) * 1979-06-21 1983-07-18 Foerenade Fabriksverken MY
FR2563622B1 (en) * 1984-04-26 1987-10-02 France Etat Armement SAFETY AND ARMING DEVICE FOR EXPLOSIVE DEVICES

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CH661169GA3 (en) 1987-07-15
EP0206978A1 (en) 1986-12-30
DE3666503D1 (en) 1989-11-23

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