EP0550321A1 - Pyrotechnical actuator with cushioned stroke - Google Patents

Pyrotechnical actuator with cushioned stroke Download PDF

Info

Publication number
EP0550321A1
EP0550321A1 EP92403492A EP92403492A EP0550321A1 EP 0550321 A1 EP0550321 A1 EP 0550321A1 EP 92403492 A EP92403492 A EP 92403492A EP 92403492 A EP92403492 A EP 92403492A EP 0550321 A1 EP0550321 A1 EP 0550321A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
cylinder according
hole
combustion chamber
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.)
Withdrawn
Application number
EP92403492A
Other languages
German (de)
French (fr)
Inventor
Jean-Pierre Thomson-Csf Frehaut
Daniel Thomson-Csf Wisshaupt
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.)
Thomson Brandt Armements SA
Original Assignee
Thomson Brandt Armements 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 Thomson Brandt Armements SA filed Critical Thomson Brandt Armements SA
Publication of EP0550321A1 publication Critical patent/EP0550321A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/006—Explosive bolts; Explosive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19—Pyrotechnical actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke

Definitions

  • the present invention relates to a pyrotechnic cylinder with damped stroke.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the invention relates to a pyrotechnic cylinder having a body comprising a piston, a combustion chamber of pyrotechnic materials and a back-pressure chamber between the head of the piston and the end of the jack, characterized in that it further comprises an intermediate compression chamber between the combustion chamber and the head of the piston , the intermediate combustion chamber being connected to the combustion chamber by a hole.
  • the main advantages of the invention are that it makes it possible to dampen the speed of movement of the piston of the jack while ensuring a driving force of the piston until it reaches the stop, that it suppresses the rebounds of the piston, finally that it is simple to implement.
  • FIG. 1a shows a block diagram of a pyrotechnic cylinder according to the prior art.
  • the cylinder consists of a main body 1, a combustion chamber 2 at high pressure. This chamber 2 is further delimited by the end or head 6 of the piston 5 of the jack. As soon as pyrotechnic materials are burned in the combustion chamber 2, the pressure in this chamber increases very quickly, develops a force greater than the resistance force F of the piston and gives it a speed of movement which increases very quickly.
  • FIG. 1b presents types of changes, generally observed from the pressure P in the combustion chamber 2 and from the speed V of the piston 5 as a function of the time t from an initial instant to.
  • the combustion of pyrotechnic materials in the chamber 2 for a very short time for reasons of regularity of combustion the pressure P inside the combustion chamber 2 decreases very quickly while the speed V of the piston 5 increases very quickly, if the initial motive force created by the combustion gases has been sufficiently powerful.
  • the speed V of the piston 5 increases rapidly but decreases just as rapidly, due to the fall in the pressure P, and the resistance force F of the piston 5 to such an extent that the piston 5 doesn’t does not reach the stop position and can therefore not be locked in this position by appropriate means. This in particular prevents organs controlled by the piston of the jack from acquiring equilibrium positions.
  • Figure 2 shows a block diagram of a cylinder according to the invention.
  • the cylinder always consists of a body 1, a combustion chamber 2, and a piston 5, but it further comprises an intermediate compression chamber 3 interposed between the combustion chamber 2 and the head 6 of the piston .
  • the intermediate compression chamber 3 is connected to the combustion chamber 2 by a hole 4.
  • This hole can be of the nozzle or nozzle type.
  • the neck can be calculated so as to make it sonic, that is to say so that the speed of the gases passing through it is equal to the speed of sound.
  • the part 9 of the jack between the head 6 of the piston 5 and the end 10 of the jack opposite to the combustion chamber 2 constitutes a back-pressure chamber.
  • a seal is provided between the intermediate compression chamber 3 and the back-pressure chamber 9.
  • This seal can for example be obtained by covering the edges of the head 6 of the piston with a strip of rubber or of elastomeric material.
  • the role of the compression chamber intermediate 3 is to avoid brutally applying a large driving force to the piston.
  • the nozzle 4 creates a delay time for the arrival of the gases in the intermediate compression chamber 3 which is in contact with the piston 5.
  • the nozzle 4 is calculated so that, taking into account the movement of the piston the pressure peak in the intermediate compression chamber 3 is less important than in the case of the jack shown in FIG. 1a.
  • the piston 5 is subjected, via its head 6, on the one hand to a force exerted by the substantially constant pressure inside the intermediate compression chamber 3 and on the other hand to a force of opposite direction exerted by the increasing pressure with the displacement of the jack of the back-pressure chamber 9. These two forces give the piston 5 a substantially constant displacement speed, damping its stroke compared to the case in particular of FIG. 1a.
  • control of the piston movement speed is increased for example by regulating the pressure in the back pressure chamber 9 during the stroke of the jack thanks to a gas passage 20 between the compression chamber 3 and the chamber 9 bypassing the sealed head 6 of the piston.
  • This passage 20 can be a pipe connecting the two chambers or preferably a simple groove in the wall of the body 1 which neutralizes the seal of the head 6 of the piston.
  • the cross-section of the passage is adjusted to control the speed of the piston throughout its stroke and can be variable depending on the position of the piston.
  • the end of the passage 20 is at a certain distance from the partition between the intermediate chamber 3 and the combustion chamber so that the gas passage is inoperative at the start of the displacement of the piston so as not to hinder the speed setting.
  • the gas passage 20 is interrupted before the end 10 of the jack so as to isolate the chamber 3 again at the end of the stroke.
  • the back-pressure chamber 9 is not absolutely sealed at the bottom 10 of the jack in order to ensure by emptying at the end of the stroke, after closing the passage 20, a frank abutment at low speed but under the action of 'a significant pressure in the chamber 3.
  • the leak 12 can be achieved at the passage of the rod 5 of the piston through the bottom 10 or by a nozzle in the bottom 10 or in the end of the body 1 in the vicinity of the bottom 10, according to the need to control the orientation of the gases emitted. It should be noted that the quantity of gas discharged is small, the chamber 3 remaining sealed at the end of the stroke of the piston 5.
  • FIG. 3 represents another possible embodiment of the pyrotechnic cylinder according to the invention.
  • This comprises several intermediate compression chambers 3, 31 of the type of the first intermediate compression chamber 3 and a back pressure chamber 9.
  • the intermediate chambers 3, 31 are formed for example, using a pull-out piston 5 and using decreasing sections in stages 33, 34 of the body 1 of the jack. These bearings 33, 34 are intended to successively stop each part 61, 62 of the pull-out piston 5. After stopping, these parts 61, 62 of decreasing sections form lids successively separating the first intermediate chamber 3 from the second intermediate chamber 31, then the second intermediate chamber 31 of the back pressure chamber 9.
  • a hole 41 of the hole 4 type between the combustion chamber 2 and the first intermediate chamber 3 is formed in the part 61 separating the first intermediate chamber 3 from the second intermediate chamber 31, then allowing the setting under pressure in the latter.
  • This last embodiment includes two intermediate chambers 3, 31, however, it is possible to increase this number, the operating principle then being similar to that described in FIG. 3.
  • the combustion of pyrotechnic materials inside the combustion chamber 2 can be started for example by an igniter controllable by an electrical signal.
  • the jack comprises locking means, not shown, to hold the piston 5 in abutment according to solutions known to those skilled in the art, for example a finger engaging the piston when the latter reaches its end. race.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention se rapporte à un vérin pyrotechnique dont le piston a une course amortie. Le vérin a un corps (1) comportant un piston (5), une chambre de combustion (2) de matières pyrotechniques et une chambre de contre-pression (9). Il comporte en outre au moins une chambre de compression intermédiaire (3) comprise entre la chambre de combustion (2) et l'extrémité (6) du piston (5), la chambre de compression intermédiaire (3) étant reliée à la chambre de combustion (2) par un trou (4). Application Vérin d'inclinaison pour projectiles suspendus. <IMAGE>The invention relates to a pyrotechnic cylinder whose piston has a damped stroke. The cylinder has a body (1) comprising a piston (5), a combustion chamber (2) of pyrotechnic materials and a back-pressure chamber (9). It further comprises at least one intermediate compression chamber (3) included between the combustion chamber (2) and the end (6) of the piston (5), the intermediate compression chamber (3) being connected to the combustion (2) through a hole (4). Application Tilt cylinder for suspended projectiles. <IMAGE>

Description

La présente invention concerne un vérin pyrotechnique à course amortie.The present invention relates to a pyrotechnic cylinder with damped stroke.

Elle s'applique notamment à des vérins d'inclinaison de munition suspendues sous parachute où l'inclinaison est commandée par l'action du vérin sur une des suspentes par l'intermédiaire d'un galet par exemple. Plus généralement, elle s'applique à des vérins dont il est nécessaire de contrôler ou d'amortir la vitesse de déplacement du piston et de conserver une force motrice importante jusqu'à la fin de course.It applies in particular to ammunition tilt cylinders suspended under a parachute where the tilt is controlled by the action of the cylinder on one of the lines by means of a roller for example. More generally, it applies to cylinders for which it is necessary to control or dampen the speed of movement of the piston and to maintain a significant driving force until the end of the stroke.

Un des inconvénients des vérins pyrotechniques est que l'inflammation des matières pyrotechniques provoque initialement une forte pression quand le piston commence à peine à engager sa course alors que cette pression diminue fortement quand le piston arrive en fin de course, celui-ci ayant par ailleurs acquis une grande vitesse, due notamment à la forte pression initiale. Il en résulte, en fin de course un choc sur la butée.One of the drawbacks of pyrotechnic cylinders is that the ignition of pyrotechnic materials initially causes a high pressure when the piston barely begins to engage its stroke whereas this pressure decreases sharply when the piston reaches the end of the stroke, the latter having moreover acquired high speed, due in particular to the high initial pressure. As a result, at the end of the stroke, a shock on the stop.

Si pour éviter ce choc, la pression est réduite ou le piston freiné, le risque est que le piston n'atteigne pas la position de butée et ne puisse être verrouillé dans cette position grâce à des moyens prévus à cet effet. Cet inconvénient peut être préjudiciable lorsque, par exemple, le vérin doit permettre à un organe d'acquérir une nouvelle position d'équilibre telle qu'il continue de s'exercer un effort de compression sur le vérin. C'est le cas notamment, pour des munitions suspendues sous parachute et devant être inclinées si l'inclinaison est commandée par l'action du vérin sur une des suspentes sous tensions par exemple.If, to avoid this shock, the pressure is reduced or the piston braked, the risk is that the piston does not reach the stop position and cannot be locked in this position by means provided for this purpose. This drawback can be detrimental when, for example, the cylinder must allow a member to acquire a new equilibrium position such that it continues to exert a compressive force on the cylinder. This is the case in particular, for ammunition suspended under a parachute and having to be inclined if the inclination is controlled by the action of the jack on one of the lines under tension, for example.

Le but de l'invention est de pallier les inconvénients précités.The object of the invention is to overcome the aforementioned drawbacks.

A cet effet, l'invention a pour objet un vérin pyrotechnique ayant un corps comportant un piston, une chambre de combustion de matières pyrotechniques et une chambre de contre pression comprise entre la tête du piston et l'extrémité du vérin, caractérisé en ce qu'il comporte en outre une chambre de compression intermédiaire comprise entre la chambre de combustion et la tête du piston, la chambre de combustion intermédiaire étant reliée à la chambre de combustion par un trou.To this end, the invention relates to a pyrotechnic cylinder having a body comprising a piston, a combustion chamber of pyrotechnic materials and a back-pressure chamber between the head of the piston and the end of the jack, characterized in that it further comprises an intermediate compression chamber between the combustion chamber and the head of the piston , the intermediate combustion chamber being connected to the combustion chamber by a hole.

L'invention a pour principaux avantages qu'elle permet d'amortir la vitesse de déplacement du piston du vérin tout en assurant une force motrice du piston jusqu'à ce qu'il arrive en butée, qu'elle supprime les rebondissements du piston, enfin qu'elle est simple à mettre en oeuvre.The main advantages of the invention are that it makes it possible to dampen the speed of movement of the piston of the jack while ensuring a driving force of the piston until it reaches the stop, that it suppresses the rebounds of the piston, finally that it is simple to implement.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'aide de la description qui suit faite en regard des dessins annexés qui représentent :

  • la figure 1a, un schéma synoptique d'un vérin pyrotechnique selon l'art antérieur ;
  • la figure 1b, des types d'évolutions généralement constatés de pression dans une chambre de compression et de vitesse d'un piston de vérin pyrotechnique ;
  • la figure 2, un schéma synoptique d'un mode de réalisation possible d'un vérin pyrotechnique selon l'invention.
  • la figure 3, un schéma synoptique d'un mode de réalisation possible d'un vérin selon l'invention à chambres de compression multiples.
Other characteristics and advantages of the invention will become apparent from the following description given with reference to the appended drawings which represent:
  • Figure 1a, a block diagram of a pyrotechnic cylinder according to the prior art;
  • FIG. 1b, generally noted types of changes in pressure in a compression chamber and in speed of a pyrotechnic cylinder piston;
  • Figure 2, a block diagram of a possible embodiment of a pyrotechnic cylinder according to the invention.
  • Figure 3, a block diagram of a possible embodiment of a cylinder according to the invention with multiple compression chambers.

La figure 1a présente un schéma synoptique d'un vérin pyrotechnique selon l'art antérieur. Le vérin est constitué d'un corps principal 1, d'une chambre de combustion 2 à haute pression. Cette chambre 2 est délimitée par ailleurs par l'extrémité ou tête 6 du piston 5 du vérin. Dès la combustion de matières pyrotechniques dans la chambre de combustion 2, la pression dans cette chambre augmente très rapidement, développe un effort supérieur à la force de résistance F du piston et confère à celui-ci une vitesse de déplacement qui croit très vite.Figure 1a shows a block diagram of a pyrotechnic cylinder according to the prior art. The cylinder consists of a main body 1, a combustion chamber 2 at high pressure. This chamber 2 is further delimited by the end or head 6 of the piston 5 of the jack. As soon as pyrotechnic materials are burned in the combustion chamber 2, the pressure in this chamber increases very quickly, develops a force greater than the resistance force F of the piston and gives it a speed of movement which increases very quickly.

La figure 1b présente des types d'évolutions, généralement constatés de la pression P dans la chambre de combustion 2 et de la vitesse V du piston 5 en fonction du temps t à partir d'un instant initial to. La combustion de matières pyrotechniques dans la chambre 2 durant très peu de temps pour des raisons de régularité de combustion, la pression P à l'intérieur de la chambre de combustion 2 décroît très vite alors que la vitesse V du piston 5 croit très vite, si la force motrice initiale crée par les gaz de combustion a été suffisamment puissante. Par ailleurs, dans certains cas, la vitesse V du piston 5 croit rapidement mais décroît tout aussi rapidement, à cause de la chute de la pression P, et de la force de résistance F du piston 5 à tel point que le piston 5 n'atteint pas la position de butée et ne peut ainsi être verrouillé dans cette position par des moyens appropriés. Cela empêche notamment à des organes commandés par le piston du vérin d'acquérir des positions d'équilibre.FIG. 1b presents types of changes, generally observed from the pressure P in the combustion chamber 2 and from the speed V of the piston 5 as a function of the time t from an initial instant to. The combustion of pyrotechnic materials in the chamber 2 for a very short time for reasons of regularity of combustion, the pressure P inside the combustion chamber 2 decreases very quickly while the speed V of the piston 5 increases very quickly, if the initial motive force created by the combustion gases has been sufficiently powerful. Furthermore, in certain cases, the speed V of the piston 5 increases rapidly but decreases just as rapidly, due to the fall in the pressure P, and the resistance force F of the piston 5 to such an extent that the piston 5 doesn’t does not reach the stop position and can therefore not be locked in this position by appropriate means. This in particular prevents organs controlled by the piston of the jack from acquiring equilibrium positions.

La figure 2 présente un schéma synoptique d'un vérin selon l'invention. Le vérin est toujours constitué d'un corps 1, d'une chambre de combustion 2, et d'un piston 5, mais il comporte en outre une chambre de compression intermédiaire 3 intercalée entre la chambre de combustion 2 et la tête 6 du piston. La chambre de compression intermédiaire 3 est reliée à la chambre de combustion 2 par un trou 4. Ce trou peut être de type ajutage ou tuyère. Préférentiellement le col peut être calculé de manière à le rendre sonique, c'est à dire de manière à ce que la vitesse des gaz le traversant soit égale à la vitesse du son. La partie 9 du vérin comprise entre la tête 6 du piston 5 et l'extrémité 10 du vérin opposée à la chambre de combustion 2, constitue une chambre de contre-pression. Une étanchéité est assurée entre la chambre de compression intermédiaire 3 et la chambre de contre-pression 9. Cette étanchéité peut par exemple être obtenue en recouvrant les bords de la tête 6 du piston par une bande en caoutchouc ou en matière élastomère. Le rôle de la chambre de compression intermédiaire 3 est d'éviter d'appliquer brutalement une force motrice importante au piston. En effet, l'ajutage 4 crée un temps de retard de l'arrivée des gaz dans la chambre de compression intermédiaire 3 qui est au contact du piston 5. L'ajutage 4 est calculé de manière que, compte tenu du mouvement du piston le pic de pression dans la chambre de compression intermédiaire 3 soit moins important que dans le cas du vérin présenté par la figure 1a.Figure 2 shows a block diagram of a cylinder according to the invention. The cylinder always consists of a body 1, a combustion chamber 2, and a piston 5, but it further comprises an intermediate compression chamber 3 interposed between the combustion chamber 2 and the head 6 of the piston . The intermediate compression chamber 3 is connected to the combustion chamber 2 by a hole 4. This hole can be of the nozzle or nozzle type. Preferably the neck can be calculated so as to make it sonic, that is to say so that the speed of the gases passing through it is equal to the speed of sound. The part 9 of the jack between the head 6 of the piston 5 and the end 10 of the jack opposite to the combustion chamber 2 constitutes a back-pressure chamber. A seal is provided between the intermediate compression chamber 3 and the back-pressure chamber 9. This seal can for example be obtained by covering the edges of the head 6 of the piston with a strip of rubber or of elastomeric material. The role of the compression chamber intermediate 3 is to avoid brutally applying a large driving force to the piston. In fact, the nozzle 4 creates a delay time for the arrival of the gases in the intermediate compression chamber 3 which is in contact with the piston 5. The nozzle 4 is calculated so that, taking into account the movement of the piston the pressure peak in the intermediate compression chamber 3 is less important than in the case of the jack shown in FIG. 1a.

Il serait possible pour améliorer encore l'écrêtage de la pression dans la chambre de compression intermédiaire 3, d'intercaler des chambres supplémentaire entre les chambres 2 et 3 séparées par des parois perforées par des trous semblables au trou 4 existant entre les chambres 2 et 3 de la figure 2. Néanmoins, cela peut poser des problèmes de réalisation pratique et l'intérêt reste limité puisque les résultats obtenus avec une seule chambre de compression intermédiaire s'avèrent satisfaisants pour les applications pratiques.To further improve pressure clipping in the intermediate compression chamber 3, it would be possible to insert additional chambers between chambers 2 and 3 separated by walls perforated by holes similar to the hole 4 existing between chambers 2 and 3 of FIG. 2. However, this can pose problems of practical implementation and the interest remains limited since the results obtained with a single intermediate compression chamber prove satisfactory for practical applications.

Le piston 5 est soumis, par l'intermédiaire de sa tête 6, d'une part à une force exercée par la pression sensiblement constante à l'intérieur de la chambre de compression intermédiaire 3 et d'autre part à une force de sens opposée exercée par la pression croissante avec le déplacement du vérin de la chambre de contre-pression 9. Ces deux forces confèrent au piston 5 une vitesse de déplacement sensiblement constante, amortissant sa course par rapport au cas notamment de la figure 1a.The piston 5 is subjected, via its head 6, on the one hand to a force exerted by the substantially constant pressure inside the intermediate compression chamber 3 and on the other hand to a force of opposite direction exerted by the increasing pressure with the displacement of the jack of the back-pressure chamber 9. These two forces give the piston 5 a substantially constant displacement speed, damping its stroke compared to the case in particular of FIG. 1a.

De plus, le contrôle de la vitesse de déplacement du piston est accru par exemple par une régulation de la pression dans la chambre de contre pression 9 pendant la course du vérin grâce à un passage de gaz 20 entre la chambre de compression 3 et la chambre 9 contournant la tête étanche 6 du piston. Ce passage 20 peut être une canalisation reliant les deux chambres ou préférentiellement une rainure simple de la paroi du corps 1 qui neutralise l'étanchéité de la tête 6 du piston.In addition, the control of the piston movement speed is increased for example by regulating the pressure in the back pressure chamber 9 during the stroke of the jack thanks to a gas passage 20 between the compression chamber 3 and the chamber 9 bypassing the sealed head 6 of the piston. This passage 20 can be a pipe connecting the two chambers or preferably a simple groove in the wall of the body 1 which neutralizes the seal of the head 6 of the piston.

La section du passage est ajustée pour contrôler la vitesse du piston pendant toute sa course et peut être variable en fonction de la position du piston.The cross-section of the passage is adjusted to control the speed of the piston throughout its stroke and can be variable depending on the position of the piston.

L'extrémité du passage 20 est à une certaine distance de la cloison entre la chambre intermédiaire 3 et la chambre de combustion de manière à ce que le passage de gaz soit inopérant au début du déplacement du piston pour ne pas gêner la mise en vitesse.The end of the passage 20 is at a certain distance from the partition between the intermediate chamber 3 and the combustion chamber so that the gas passage is inoperative at the start of the displacement of the piston so as not to hinder the speed setting.

De même, dans la chambre à contre pression 9, le passage de gaz 20 s'interrompt avant l'extrémité 10 du vérin de manière à isoler en fin de course à nouveau la chambre 3.Similarly, in the back-pressure chamber 9, the gas passage 20 is interrupted before the end 10 of the jack so as to isolate the chamber 3 again at the end of the stroke.

Préférentiellement la chambre 9 de contre pression n'est pas absolument étanche au niveau du fond 10 du vérin afin d'assurer par vidange en fin de course, après fermeture du passage 20 une mise en butée franche a faible vitesse mais sous l'action d'une pression importante dans la chambre 3. Le défaut d'étanchéité 12 peut être réalisé au niveau du passage de la tige 5 du piston à travers le fond 10 ou par un ajutage pratiqué dans le fond 10 ou dans l'extrémité du corps 1 au voisinage du fond 10, selon le besoin de contrôle de l'orientation des gaz émis. Il est a noter que la quantité de gaz évacué est faible, la chambre 3 restant étanche en fin de course du piston 5.Preferably, the back-pressure chamber 9 is not absolutely sealed at the bottom 10 of the jack in order to ensure by emptying at the end of the stroke, after closing the passage 20, a frank abutment at low speed but under the action of 'a significant pressure in the chamber 3. The leak 12 can be achieved at the passage of the rod 5 of the piston through the bottom 10 or by a nozzle in the bottom 10 or in the end of the body 1 in the vicinity of the bottom 10, according to the need to control the orientation of the gases emitted. It should be noted that the quantity of gas discharged is small, the chamber 3 remaining sealed at the end of the stroke of the piston 5.

La figure 3 représente un autre mode possible de réalisation du vérin pyrotechnique selon l'invention. Celui-ci comprend plusieurs chambres de compression intermédiaires 3, 31 du type de la première chambre de compression intermédiaire 3 et une chambre de contre pression 9. Les chambres intermédiaires 3, 31 sont formées par exemple, à l'aide d'un piston gigogne 5 et à l'aide de sections décroissantes par paliers 33, 34 du corps 1 du vérin. Ces paliers 33, 34 sont destinés à arrêter successivement chaque partie 61, 62 du piston gigogne 5. Après arrêt, ces parties 61, 62 de sections décroissantes forment des opercules séparant successivement la première chambre intermédiaire 3 de la deuxième chambre intermédiaire 31, puis la deuxième chambre intermédiaire 31 de la chambre de contre pression 9. Un trou 41 du type du trou 4 entre la chambre de combustion 2 et la première chambre intermédiaire 3 est ménagé dans la partie 61 séparant la première chambre intermédiaire 3 de la deuxième chambre intermédiaire 31, permettant alors la mise sous pression dans cette dernière.FIG. 3 represents another possible embodiment of the pyrotechnic cylinder according to the invention. This comprises several intermediate compression chambers 3, 31 of the type of the first intermediate compression chamber 3 and a back pressure chamber 9. The intermediate chambers 3, 31 are formed for example, using a pull-out piston 5 and using decreasing sections in stages 33, 34 of the body 1 of the jack. These bearings 33, 34 are intended to successively stop each part 61, 62 of the pull-out piston 5. After stopping, these parts 61, 62 of decreasing sections form lids successively separating the first intermediate chamber 3 from the second intermediate chamber 31, then the second intermediate chamber 31 of the back pressure chamber 9. A hole 41 of the hole 4 type between the combustion chamber 2 and the first intermediate chamber 3 is formed in the part 61 separating the first intermediate chamber 3 from the second intermediate chamber 31, then allowing the setting under pressure in the latter.

Ce dernier exemple de réalisation comprend deux chambres intermédiaires 3, 31, néanmoins, il est possible d'augmenter ce nombre, le principe de fonctionnement étant alors analogue à celui décrit par la figure 3.This last embodiment includes two intermediate chambers 3, 31, however, it is possible to increase this number, the operating principle then being similar to that described in FIG. 3.

La combustion des matières pyrotechniques à l'intérieur de la chambre de combustion 2 peut être déclenchée par exemple par un inflammateur commandable par un signal électrique.The combustion of pyrotechnic materials inside the combustion chamber 2 can be started for example by an igniter controllable by an electrical signal.

Enfin, le vérin comporte des moyens de verrouillage, non représentés, pour maintenir le piston 5 en butée selon des solutions connues de l'homme de l'art, par exemple un doigt s'engageant dans le piston quand celui-ci atteint sa fin de course.Finally, the jack comprises locking means, not shown, to hold the piston 5 in abutment according to solutions known to those skilled in the art, for example a finger engaging the piston when the latter reaches its end. race.

Claims (10)

Vérin pyrotechnique ayant un corps (1) comportant un piston (5), une chambre de combustion (2) de matières pyrotechniques et une chambre de contre pression (9) comprise entre la tête (6) du pistion (5) et l'extrémité (10) du vérin, caractérisé en ce qu'il comporte en outre une chambre de compression intermédiaire (3) comprise entre la chambre de combustion (2) et la tête (6) du piston (5), la chambre de combustion intermédiaire étant reliée à la chambre de combustion (2) par un trou (4), un passage de gaz (20) contournant la tête (6) du pistion pour relier la chambre intermédiaire (3) à la chambre de contre-pression (9).Pyrotechnic cylinder having a body (1) comprising a piston (5), a combustion chamber (2) of pyrotechnic materials and a back-pressure chamber (9) included between the head (6) of the piston (5) and the end (10) of the jack, characterized in that it further comprises an intermediate compression chamber (3) included between the combustion chamber (2) and the head (6) of the piston (5), the intermediate combustion chamber being connected to the combustion chamber (2) by a hole (4), a gas passage (20) bypassing the head (6) of the piston to connect the intermediate chamber (3) to the back pressure chamber (9). Vérin selon la revendication 1, caractérisé en ce que son corps (1) possède un trou (12) de fuite vers l'extérieur, ce trou (12) n'étant pas au contact de la chambre de compression intermédiaire (3) durant la course du piston (5) et en fin de course.Cylinder according to claim 1, characterized in that its body (1) has a hole (12) leaking outwards, this hole (12) not being in contact with the intermediate compression chamber (3) during the piston stroke (5) and end of stroke. Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce que le passage de gaz (20) est fermé en début et en fin de course du piston.Cylinder according to any one of the preceding claims, characterized in that the gas passage (20) is closed at the start and at the end of the piston stroke. Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce que le passage de gaz (20) est une rainure à section variable orientée selon une génératrice du corps (1).Cylinder according to any one of the preceding claims, characterized in that the gas passage (20) is a variable section groove oriented along a generatrix of the body (1). Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce que le trou (4) reliant la chambre de compression intermédiaire (3) est de type ajutage.Cylinder according to any one of the preceding claims, characterized in that the hole (4) connecting the intermediate compression chamber (3) is of the nozzle type. Vérin selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le trou (4) reliant la chambre de combustion (2) à la chambre de compression intermédiaire (3) est de type tuyère.Cylinder according to any one of claims 1 to 4, characterized in that the hole (4) connecting the combustion chamber (2) to the intermediate compression chamber (3) is of the nozzle type. Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce que le trou (4) reliant la chambre de combustion (2) à la chambre de compression intermédiaire (3) est sonique.Cylinder according to any one of the preceding claims, characterized in that the hole (4) connecting the chamber combustion (2) at the intermediate compression chamber (3) is sonic. Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend plusieurs chambres de compressions intermédiaires (3, 31) obtenues grâce à un piston gigogne (5) dont les parties (61, 62) de sections décroissantes sont successivement arrêtées par des paliers (33, 34) ménagés sur le corps (1) du vérin, les parties (61, 62) formant des opercules séparant entre elles les chambres (3, 31, 9), des trous étant ménagés dans les parties (61) séparant les chambres intermédiaires (3, 31).Cylinder according to any one of the preceding claims, characterized in that it comprises several intermediate compression chambers (3, 31) obtained by means of a pull-out piston (5) whose parts (61, 62) of decreasing sections are successively stopped by bearings (33, 34) formed on the body (1) of the jack, the parts (61, 62) forming lids separating between them the chambers (3, 31, 9), holes being formed in the parts (61 ) separating the intermediate chambers (3, 31). Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte en outre des moyens de verrouillage pour maintenir le piston (5) en butée.Cylinder according to any one of the preceding claims, characterized in that it further comprises locking means for holding the piston (5) in abutment. Vérin selon l'une quelconque des revendications précédentes, caractérisé en ce que la combustion des matières pyrotechniques à l'intérieur de la chambre de combustion (2) est déclenchée par un inflammateur commandable électriquement.Cylinder according to any one of the preceding claims, characterized in that the combustion of the pyrotechnic materials inside the combustion chamber (2) is triggered by an electrically controllable igniter.
EP92403492A 1991-12-31 1992-12-21 Pyrotechnical actuator with cushioned stroke Withdrawn EP0550321A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9116385 1991-12-31
FR9116385A FR2685741A1 (en) 1991-12-31 1991-12-31 PYROTECHNIC CYLINDER WITH AMORTIZED RUN.

Publications (1)

Publication Number Publication Date
EP0550321A1 true EP0550321A1 (en) 1993-07-07

Family

ID=9420706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92403492A Withdrawn EP0550321A1 (en) 1991-12-31 1992-12-21 Pyrotechnical actuator with cushioned stroke

Country Status (3)

Country Link
US (1) US5303631A (en)
EP (1) EP0550321A1 (en)
FR (1) FR2685741A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1138957A1 (en) * 2000-03-29 2001-10-04 Pyroalliance Re-armable separation screw with low induced shock
FR2845446A1 (en) 2002-10-04 2004-04-09 Pyroalliance Steering column energy absorption system comprises pyrotechnic gas generator and piston able to move in damping chamber provided with gas evacuation channel
EP1486697A1 (en) 2003-06-13 2004-12-15 Pyroalliance Pyrotechnic gas damper with modulated effect
EP1496268A1 (en) * 2003-07-10 2005-01-12 Pyroalliance Pyrotechnical actuator with variable thrust
EP1495918A2 (en) * 2003-07-10 2005-01-12 Pyroalliance damping device for the displacement of a part of a vehicle including a metallic yarn
FR2875293A1 (en) 2004-09-14 2006-03-17 Pyroalliance Sa HYBRID ACTUATOR WITH CHARGE COMPRISING A DISSOCATED OXIDANT AND REDUCER
EP1705383A2 (en) 2005-03-24 2006-09-27 SNPE Matériaux Energétiques Pyrotechnical actuator having pressure control means
EP1795405A2 (en) * 2005-12-08 2007-06-13 Bayerische Motoren Werke Aktiengesellschaft Hood structure of a vehicle
US7568341B2 (en) 2004-10-07 2009-08-04 Snpe Materiaux Energetiques Pyrotechnic actuator with controllable force and optimised geometry
WO2011157940A1 (en) 2010-06-15 2011-12-22 Sme Triggered-stroke actuator provided with a gas discharge device
WO2013174121A1 (en) * 2012-05-23 2013-11-28 中联重科股份有限公司 Hydraulic cylinder buffering control method, buffer type hydraulic cylinder control system and hydraulic equipment
FR3005724A1 (en) * 2013-05-17 2014-11-21 Herakles PYROTECHNIC GAS GENERATOR

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4433212C1 (en) * 1994-09-17 1996-01-25 Daimler Benz Aerospace Ag Hydraulic circuit pressuriser for rescue or emergency appliances
US6318228B1 (en) * 1997-04-24 2001-11-20 Ramtech 2000, L.L.C. Forcible entry device
AT405729B (en) * 1998-06-16 1999-11-25 Hirtenberger Praezisionstechni Delay element for pyrotechnic charges
JP3943295B2 (en) * 1999-08-25 2007-07-11 タカタ株式会社 Pretensioner and seat belt device having the same
US6532739B2 (en) 1999-08-25 2003-03-18 Takata Corporation Pretensioner
US6631668B1 (en) 2000-11-10 2003-10-14 David Wilson Recoilless impact device
US6672194B2 (en) 2001-07-19 2004-01-06 Textron Systems Corporation Energetic-based actuator device with rotary piston
US7182191B2 (en) * 2002-07-11 2007-02-27 Autoliv Asp, Inc. Motion damper
US6764118B2 (en) 2002-09-11 2004-07-20 Autoliv Asp, Inc. Active bumper assembly
US6922153B2 (en) 2003-05-13 2005-07-26 Credo Technology Corporation Safety detection and protection system for power tools
US6942261B2 (en) 2003-08-14 2005-09-13 Autoliv Asp, Inc. Linear actuator with an internal dampening mechanism
FR2864021B1 (en) * 2003-12-19 2006-05-26 Lacroix Soc E DEVICE FOR CONTROLLING THE MOTION OF A CLOSURE MEMBER FOR A VEHICLE
US20050155449A1 (en) * 2004-01-21 2005-07-21 Greg Birchmeier Steering wheel damper
US7303040B2 (en) * 2004-05-18 2007-12-04 Autolive Asp, Inc. Active vehicle hood system and method
WO2006010562A2 (en) * 2004-07-23 2006-02-02 Delphi Technologies, Inc. Pyrotechnic actuator
DE102005051657A1 (en) * 2005-10-28 2007-05-03 GM Global Technology Operations, Inc., Detroit Pyrotechnic actuator
GB2432399A (en) * 2005-11-18 2007-05-23 Autoliv Dev Piston and cylinder pyrotechnic actuator
JP5239253B2 (en) * 2007-08-14 2013-07-17 日産自動車株式会社 Hood flip-up device
WO2009155527A2 (en) * 2008-06-19 2009-12-23 Progenics Pharmaceuticals, Inc. Phosphatidylinositol 3 kinase inhibitors
EP2290245A1 (en) 2009-08-27 2011-03-02 WOW Company Actuator with a counter compression means and pre compression means
DE102010033438B4 (en) * 2010-08-04 2013-10-31 Dominic Becker Shut-off
US8534174B2 (en) 2010-09-27 2013-09-17 Power Tool Institute Pyrotechnic actuator and power cutting tool with safety reaction system having such pyrotechnic actuator
DE102011106513A1 (en) * 2011-06-15 2012-12-20 Trw Airbag Systems Gmbh Pyrotechnic actuator for vehicle safety device, has exhaust that is designed such that flow connection is blocked in end section of piston, where piston is arranged in cylinder tube with longitudinal axis and is displaced in axial direction
DE102011107543A1 (en) 2011-07-15 2013-01-17 Bayern-Chemie Gesellschaft Für Flugchemische Antriebe Mbh Steamed pyrotechnic actuator
FR3042237B1 (en) * 2015-10-09 2017-11-03 Labinal Power Systems ACTUATING DEVICE FOR AN AIRCRAFT EMERGENCY WIND SYSTEM
US11512645B2 (en) * 2020-03-06 2022-11-29 Goodrich Corporation Solid-propellant gas generator assemblies and methods

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB809031A (en) * 1954-11-26 1959-02-18 Gen Electric Improvements in apparatus for generating gaseous working fluid
US2892452A (en) * 1957-05-08 1959-06-30 Weinstock Manuel Load sensitive-gas operated thruster
US3118349A (en) * 1964-01-21 Actuator cylinder
FR1582177A (en) * 1968-07-11 1969-09-26
US4054032A (en) * 1976-09-03 1977-10-18 Networks Electronic Corporation Explosive actuated pin puller
US4237690A (en) * 1978-08-25 1980-12-09 Nippon Soken, Inc. Piston return stop device for seat belt tensioning device
FR2489898A1 (en) * 1980-09-11 1982-03-12 Repa Feinstanzwerk Gmbh PYROTECHNIC DRIVE DEVICE, IN PARTICULAR FOR THE RETRIEVAL TENSIONER OF A SEAT BELT SYSTEM
US4412420A (en) * 1980-07-03 1983-11-01 Networks Electronics Corp. Explosive actuated pin puller
DE3717458A1 (en) * 1987-05-23 1988-12-01 Diehl Gmbh & Co Pyrotechnic force element

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149456A (en) * 1963-08-16 1964-09-22 Charles S Sterrett Gas damped thruster
US4034816A (en) * 1976-05-04 1977-07-12 Lutich Louis L Demolition tool
US4037821A (en) * 1976-08-10 1977-07-26 The United States Of America As Represented By The Secretary Of The Army Telescoping retractor
US4753151A (en) * 1986-06-27 1988-06-28 Lockheed Corporation Self-retracting ballistic actuator system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118349A (en) * 1964-01-21 Actuator cylinder
GB809031A (en) * 1954-11-26 1959-02-18 Gen Electric Improvements in apparatus for generating gaseous working fluid
US2892452A (en) * 1957-05-08 1959-06-30 Weinstock Manuel Load sensitive-gas operated thruster
FR1582177A (en) * 1968-07-11 1969-09-26
US4054032A (en) * 1976-09-03 1977-10-18 Networks Electronic Corporation Explosive actuated pin puller
US4237690A (en) * 1978-08-25 1980-12-09 Nippon Soken, Inc. Piston return stop device for seat belt tensioning device
US4412420A (en) * 1980-07-03 1983-11-01 Networks Electronics Corp. Explosive actuated pin puller
FR2489898A1 (en) * 1980-09-11 1982-03-12 Repa Feinstanzwerk Gmbh PYROTECHNIC DRIVE DEVICE, IN PARTICULAR FOR THE RETRIEVAL TENSIONER OF A SEAT BELT SYSTEM
DE3717458A1 (en) * 1987-05-23 1988-12-01 Diehl Gmbh & Co Pyrotechnic force element

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807123A1 (en) * 2000-03-29 2001-10-05 Pyroalliance RESETABLE SEPARATION NUT WITH LOW LEVEL OF INDUCED SHOCK
EP1138957A1 (en) * 2000-03-29 2001-10-04 Pyroalliance Re-armable separation screw with low induced shock
FR2845446A1 (en) 2002-10-04 2004-04-09 Pyroalliance Steering column energy absorption system comprises pyrotechnic gas generator and piston able to move in damping chamber provided with gas evacuation channel
DE10346031B4 (en) * 2002-10-04 2006-06-08 Pyroalliance Energy absorbing device, in particular for steering columns
US6959548B2 (en) 2003-06-13 2005-11-01 Pyroalliance Adjustable pyrotechnic-gas shock absorber
EP1486697A1 (en) 2003-06-13 2004-12-15 Pyroalliance Pyrotechnic gas damper with modulated effect
FR2856125A1 (en) 2003-06-13 2004-12-17 Pyroalliance MODULAR PYROTECHNIC GAS SHOCK ABSORBER
EP1495918A2 (en) * 2003-07-10 2005-01-12 Pyroalliance damping device for the displacement of a part of a vehicle including a metallic yarn
FR2857421A1 (en) * 2003-07-10 2005-01-14 Pyroalliance PYROTECHNIC ACTUATOR WITH VARIABLE PUSH EFFECT
EP1495918A3 (en) * 2003-07-10 2005-03-16 Pyroalliance damping device for the displacement of a part of a vehicle including a metallic yarn
FR2857313A1 (en) * 2003-07-10 2005-01-14 Pyroalliance DEVICE FOR DAMPING THE MOVEMENT OF A PIECE INVOLVING A METAL WIRE
US7296504B2 (en) 2003-07-10 2007-11-20 Snpe Materiaux Energetiques Pyrotechnic actuator of the variable-thrust-acting type
EP1496268A1 (en) * 2003-07-10 2005-01-12 Pyroalliance Pyrotechnical actuator with variable thrust
FR2875293A1 (en) 2004-09-14 2006-03-17 Pyroalliance Sa HYBRID ACTUATOR WITH CHARGE COMPRISING A DISSOCATED OXIDANT AND REDUCER
EP1637511A2 (en) 2004-09-14 2006-03-22 Pyroalliance Pyrotechnical actuator with a charge comprising an oxidizer and a dissociated reducing agent
US7568341B2 (en) 2004-10-07 2009-08-04 Snpe Materiaux Energetiques Pyrotechnic actuator with controllable force and optimised geometry
FR2883606A1 (en) * 2005-03-24 2006-09-29 Snpe Materiaux Energetiques Sa PYROTECHNIC ACTUATOR WITH PRESSURE REGULATING MEMBER
US7475542B2 (en) 2005-03-24 2009-01-13 Snpe Materiaux Energeriques Pyrotechnic actuator furnished with a pressure regulator member
EP1705383A3 (en) * 2005-03-24 2009-05-13 SNPE Matériaux Energétiques Pyrotechnical actuator having pressure control means
EP1705383A2 (en) 2005-03-24 2006-09-27 SNPE Matériaux Energétiques Pyrotechnical actuator having pressure control means
EP1795405A2 (en) * 2005-12-08 2007-06-13 Bayerische Motoren Werke Aktiengesellschaft Hood structure of a vehicle
EP1795405A3 (en) * 2005-12-08 2007-08-22 Bayerische Motoren Werke Aktiengesellschaft Hood structure of a vehicle
WO2011157940A1 (en) 2010-06-15 2011-12-22 Sme Triggered-stroke actuator provided with a gas discharge device
US9470250B2 (en) 2010-06-15 2016-10-18 Herakles Triggered-stroke actuator fitted with a gas evacuation device
WO2013174121A1 (en) * 2012-05-23 2013-11-28 中联重科股份有限公司 Hydraulic cylinder buffering control method, buffer type hydraulic cylinder control system and hydraulic equipment
FR3005724A1 (en) * 2013-05-17 2014-11-21 Herakles PYROTECHNIC GAS GENERATOR
FR3005725A1 (en) * 2013-05-17 2014-11-21 Herakles PYROTECHNIC GAS GENERATOR
WO2014184505A3 (en) * 2013-05-17 2015-06-04 Herakles Pyrotechnical gas generator
US10072912B2 (en) 2013-05-17 2018-09-11 Arianegroup Sas Pyrotechnical gas generator
DE112014002455B4 (en) 2013-05-17 2024-05-02 Arianegroup Sas Pyrotechnic gas generator

Also Published As

Publication number Publication date
FR2685741B1 (en) 1995-04-07
FR2685741A1 (en) 1993-07-02
US5303631A (en) 1994-04-19

Similar Documents

Publication Publication Date Title
EP0550321A1 (en) Pyrotechnical actuator with cushioned stroke
CA2154110C (en) Pyrotechnical launcher of at least one projectile
FR2474101A1 (en) REGENERATION INJECTION DEVICE EQUIPPED WITH VALVES FOR ENGINE-ROCKET
BE1013466A6 (en) Rotary projectile and explosive compressed air.
FR2489898A1 (en) PYROTECHNIC DRIVE DEVICE, IN PARTICULAR FOR THE RETRIEVAL TENSIONER OF A SEAT BELT SYSTEM
FR2876968A1 (en) GAS GENERATOR EQUIPPED WITH PRESSURE CONTROL MEANS AND SAFETY DEVICE PROVIDED THEREIN.
FR2641036A1 (en)
FR2482665A1 (en) SOLID AND VARIABLE PUSH FUEL MOTOR
BE861606A (en) PROJECTILE OF LAUNCHING ELECTROMAGNETIC LURES.
FR2496170A1 (en) DEVICE FOR CONTROLLING THE FUEL SUPPLY OF AN INTERNAL COMBUSTION ENGINE
FR2568160A1 (en) POWDER EXPLOSION ACTION SEALING GUN
CA2912652A1 (en) Pyrotechnic gas generator for actuating a jack
EP1577508A1 (en) Valve return device motor provided with such a device
FR2617911A1 (en) SOLID PROPERGOL POWDER BLOCK AND GAS GENERATOR
FR2697327A1 (en) Housing for propellant charge.
EP0107117B1 (en) Hydro-pneumatic recoil brake system with energy recovery for ordnance and hand firearms
FR2768976A1 (en) PYROTECHNIC CONTROL, IN PARTICULAR FOR VEHICLE OCCUPANT RETAINING SYSTEMS
FR2676415A1 (en) PNEUMATIC SERVOMOTOR.
FR2686679A1 (en) Safety device protecting against excess pressures of a fluid confined in an enclosure
FR2552514A1 (en) DAMPER OF THE FLUIDIC TYPE
FR2699659A1 (en) Breakable join device between front and rear sections of munition
FR2699660A1 (en) A system for priming and self-destructing a munition, in particular a submunition intended to be ejected from a cargo shell with a clean rotational movement about an axis.
FR2805341A1 (en) Pressure regulator for semi-automatic carbine comprises tube mounted in ferrule attached to carbine whose bore is connected to bore of weapon by gas channel
BE551367A (en)
FR2515808A1 (en) Bullet trap for rifle grenade - has hollow conical body with steps retaining metal discs and plastics damping washers

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE SE

17P Request for examination filed

Effective date: 19931108

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19950701