FR2671622A1 - PROJECTILE WITH REPORTED HAT. - Google Patents

Abstract

The invention relates to a projectile comprising a detachable cap (2) which is applied by interlocking and / or friction to the side of the projectile opposite to the propellant charge, surrounds the warhead, has a circular cross section in the area of its most large dimension in the longitudinal direction of the projectile (1) and allows ejection out of the cartridge magazine of the weapon. The cap (2) is fixed on the projectile (1) by snapping into an annular groove (5) provided on the warhead of the projectile (1) and it ensures the gas tightness between the projectile and the barrel of the armed.

Description

Projectile with attached cap.

  The present invention relates to projectiles which, on the side opposite to the propellant charge, are provided with a cap which is secured by a connection by interlocking and / or by friction on

  their warhead and surrounds it.

  The invention relates mainly to cartridges which, owing to their design, exhibit an excessively large free movement of the projectile up to the entrance of the tube and / or which have a particularly long warhead. Such projectiles cannot always be engaged by perfectly centered in the tube and,

  when in use, unwanted ricochets may occur

  These disadvantages appear mainly in the case of ammunition without casings. In addition, part of the gases generated during the ignition flows along the projectile before it enters the tube, that is to say that the expected optimal gas pressure cannot be established Therefore, safe and definite combustion of the propellant powder is not completely guaranteed

at the start of the firing.

  It was therefore necessary to find a way to engage the projectile coming out of the case in a well-centered manner in the tube or, in the case of ammunition without a case, of the propellant mass and to retain

  gases flowing along the projectile during ignition.

  This result is achieved according to the invention with a projectile which

  is fitted with a detachable cap applied by a socket connection

  and / or by friction on its side opposite the propellant charge, surrounding the warhead, having a circular cross section in the

  its largest dimension in the longitudinal direction of the projection

  tile and allowing ejection from the cartridge store of

tear.

  The cap applied to the projectile acts as both a guiding element and a sealing element In weapons with magazines with pivotable cartridges, as described for example in German patent application 28 13 633, it possibly also acts as an ejector element in the event of misfires which

  are expelled by the following cartridge warhead on warhead.

  The external shape of the cap can be chosen at will under the conditions mentioned above for the aforementioned projectile It can have the maximum cross section over its entire length or over one or more partial lengths; in the same way, the maximum cross section can be located on the side facing the projectile ogive or in any other arbitrary location. Furthermore, the cross section does not absolutely have to be circular; it can also, especially inside

  partial lengths not having the cross-sectional diameter

  dirty maximum, be adapted to the shape of the cartridge.

  The maximum cross-section does not necessarily have to correspond exactly to the caliber of the barrel of the weapon. It can also be undersized; hree, for example when the cartridge magazine carries

  a shoulder for the application of the cartridge and therefore allows

  quent a perfectly defined positioning of the cartridge in the store The cap is then used less for positioning the cartridge than for sealing against firing gases The deviation from the caliber of the tube of the weapon should therefore not if possible

exceed 5% in such a case.

  It is also possible to choose a maximum cross-calibrated cross-section, in particular when the cartridge magazine is produced without a shoulder, as is precisely necessary in the case of using ammunition without a socket. The cap then also provides the support function for the cartridge acting as a stop for the firing process In this case, the deviation from the caliber of the barrel of the shaft can reach up to 50%

  depending on the materials that are used for the cap In this case

  this, as materials for the cap, we can especially consider those which are easily deformable under the conditions of temperature and

  pressure in the cartridge magazine when fired These materials

  are known to those skilled in the art.

  The cap is made of a material whose density is lower than that of the projectile material Oa can for example use non-combustible thermoplastic materials such as polyethylene, polyamides, polytetrafluoroethylene or the like, polymers

  thermostable, charged reaction resins and light metals.

  The caps can also be made of a sintered material which,

  where appropriate, also decomposes under pressure conditions

  combustion density The density of the material used must in this case be as low as possible The materials mentioned may also

  contain additives which allow special actions

  agents, such as agents which increase the sliding ability

  for the next projectile or clear the tube of deposits.

  The cap surrounds the projectile ogive and is applied to the side wall of its tapering portion. It need not be firmly applied over the entire wall; it suffices to provide it with a time-limited fixing to the projectile. This fixing can be done by known means, for example annular grooves or bosses. The fixing can also be carried out using rivets or pins comprising

  possibly the beginnings of rupture.

  The cap according to the invention placed on the projectile ogive ensures a centered engagement of the latter in the barrel after the setting

  of the propellant during the movement of the projectile.

  When building up the pressure in the cartridge magazine, it acts as sealing elements and thus decreases the loss of gas occurring through the gap between the tapered warhead of the projectile and the barrel during the lapse of time. of time elapsing before the projectile is fully engaged in the barrel The cap is torn off from the projectile warhead by the gases escaping forward; it leaves the barrel before the projectile and is deviated from its trajectory due to its unfavorable ballistic shape and its low weight It falls back to the ground a few meters after having

left the mouth of the tube.

  The invention will be better understood using the description of

  embodiments taken as examples, but not limiting, and illustrated by the appended drawing, in which FIGS. 1 and 2 represent a schematic structure of the cartridge magazine with entry of the tube;

  FIG. 3 represents an embodiment with sub-cover

calibrated;

  FIG. 4 represents an embodiment with cover over

  calibrated; Figures 5-7 show embodiments with

  special attachments of the cap on the projectile.

  Figures 1 and 2 show a section of a weapon at the top

  In the two figures, the reference 1 designates the projectile, the reference 2 indicates the attached cap and the

  reference 3 the barrel of the weapon In figure 1 the cap is under

  calibrated, in Figure 2 it is over-calibrated.

  In the embodiments shown in Figures 3 and 4, the cap is secured by an annular groove 5 formed on the projectile and into which is snapped

  elastically the end, curved inwards, of the cap.

  FIG. 5 represents two geometrically different embodiments of the cover 2 with fixings by means of bosses 6 In both cases, the maximum diameter of the cross section of the

  cap is on the side facing the powder of the propellant charge

  ve, in Figure 5 a it is also at the tip

of the warhead.

  Figures 6 and 7 show embodiments in which the cap 2 is fixed either by a stud 7, or by a

  transverse pin 8 which may also include a primer of rup-

  ture The nipple 7 can be made in the form of a central nipple

  of the cap or be connected to it in the form of separate rivets

  res In both cases, the projectile warhead has holes

  in which the nipple or pin engages.

Claims (3)

  1 Projectile comprising a detachable cap (2) applied by an interlocking and / or friction connection on its side opposite to   the propellant charge, surrounding the warhead, having a cross-section   dirty circular in the area of its largest dimension in the longitudinal direction of the projectile (1) and allowing an injection outside the cartridge magazine for the weapon.   2 Projectile according to claim 1, characterized in that the cap (2) is made of a material whose density is   lower than the density of the projectile material (1).   3 Projectile according to claim 1 or 2, characterized in that the cap (2) is fixed by means of an annular groove (5) on the projectile (1).