FR2660747A1 - Finned projectile with firing indicator (case 2) - Google Patents

Abstract

The invention relates to a projectile with a rear extension, for example with a fin unit, such as a rifle grenade, of the type comprising a bullet trap 3. It is characterised in that it comprises means for displaying its firing state, which are actuated as a result of the inflation of the bullet trap and which consist, for example, of at least one pin 7 displaceable in a bore 8 made radially in the casing tube 5 at a point level with the bullet trap, preferably in order to cut an embrittled ring 9 covering the bore.

Description

 The present invention relates to prolectiles having a rear extension, such as a tail, such as qrenades à fusil. aui are propelled Dar for example by a Dropulsive cartridge or a rifle bullet, and proposes means to visualize if such a projectile was fired or not.

 It sometimes happens that ammunition does not fire and remains on the ground. all arming security raised.

These munitions are then dangerous to handle. If it is easy. for example to distinguish a shell having been fired from a shell which was not fired by the appearance of the belt, on the other hand for certain oroiectiles the diagnosis is much more difficult to establish. This is particularly the case for rifle grenades.

 I1 is indeed possible au'une grenade before had a failure of operation, falls jointly on a loose ground and thus preserves an external asDect as aue one can believe it forgotten by mistake, or au'elle is partially buried and possible external damage resulting from the fall of the masaues.

It can then be picked up, in which case the grenade can either explode during handling, or explode at the end of the rifle if one tries to use it a second time, the bullet trap not resisting a second impact.

 We therefore tried to put on an alarm signal to prevent any such accident.

 The known solutions apply to the security and arming device.

 Thus, patent FR2583869 describes an arming safety device which can be judged from the safety or arming state through small windows made of transparent plastic material, against which moves a rotor carrying segments of different colors . Depending on the color observed, we can deduce the arming state.

 This device has many drawbacks, not the least of which is that it risks being completely invisible due to burial, or even by simple soiling, lack of lighting or frost in cold weather. Furthermore, if the ammunition is of an unknown type, the color code may also be so, in which case the device is unusable.

 The patent FR2214105 describes a display device constituted by two plugs which are eiected when the initiation of the armament security device is operating. In this way we acquire certainty, in the absence of the naked caps the qrenade does not risk to detonate unexpectedly. However, during their presence, there is no indication of the status of the armament security device and of the bullet trap. The grenade may then have been pulled with the safety devices raised, and present a maximum handling danger. Furthermore we find the same problems related to the burial of the grenade and the sealing of the plugs.

 Although safety is not at the origin of the concept of telescopic grenade described by patents EP0030052 and Ex02635481 this neut constitute an answer to the problem. Indeed, the shooting of such a grenade implies that one first stretches a telescopic sleeve thus modifying notably its external appearance. Any grenade with significant elongation may therefore appear suspicious. On the other hand, such a concept does not seem proDice to- an optimization of the military charge (shape, distribution of the fragments ...) 1 or to the use of formed charges. It follows that these grenades are likely to be only not very effective anti-personnel projectiles. Otherwise. this security does not protect against manual deployment of the sleeve, without the grenade having been fired.

 The object of the invention is to provide a simple display device, therefore economical and reliable. insensitive to external conditions, allowing you to know at a glance, at a glance, if a projectile has already been fired. The invention further proposes to give an account of the state of the comDlet projectile and not of its only security and arming device.

 The subject of the invention is therefore a projectile having a rear extension, for example a tail unit such as a rifle grenade, of the type comprising a bullet trap, characterized in that it comprises means for displaying its firing state , activated by the swelling of the bullet trap.

 and preferably. the means of - suailsetlon are constituted by at least one movable pin in a bore made radially in the wall of the tuDe-painful at the level of the bullet trap.

 In one embodiment, the pin is able to cut a weakened ring covering the bore.

 The means of visualization of the firing state may for example be constituted by three pegs placed at 120 around the ear tube, at the level of the bullet trap.

Other characteristics and advantages appear in the following description of an embodiment, without limitation. with reference to the drawing on which
FIG. 1 is a schematic view of a projectile according to the invention,
- Figures 2 and 3 are enlarged schematic views of the rear part of the projectile, showing the firing indicator device before and after operation.

 FIG. 1 shows a tail 1 projectile 2 equipped with a bullet trap -3, propelled by qaz, and provided with a firing indicator 4. The ammunition has a cartridge tube 5 containing the bullet trap 3.

 This tube-socket is used to position the ammunition on the barrel of the rifle and to propel it with the gases of a cartridge.

 The ball is stopped in the ball trap. This Drovoque judgment deforms the envelope 6 of the latter.

 This swelling is used to move colored pins 7, for example three in number, placed around the tube to slide in bores 8 and cut a weakened cap or ring 9.

 The sight of the end of the colored pawns indicates that the bullet trap of the ammunition has already stopped a bullet and therefore that this ammunition was propelled by the gases of a cartridge.

Claims (4)

 CLAIM  5 - Projectile having a rear extension for example a tail, such as a rifle grenade, of the tvpe comprising a bullet trap (3), characterized in that it comprises display means (4) of its firing state, actuated by the sound of the bullet trap (31. 2 - Projectile according to claim 1, characterized in that the visualization means consist of at least one pin (71 movable in a bore (8) formed radially in the wall of the tube-socket (5) at the level of the bullet trap (3). 3 - Projectile according to claim 2, characterized in that the Dion r7) is able to cut a weakened ring (9) covering the bore. 4 - Projectile according to one of claims 2 or 3, characterized in that the means for displaying the firing state are constituted by three pins (7) placed at 120 around the casing tube, at the level of the bullet trap.