Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
  • F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
  • F42B10/48—Range-reducing, destabilising or braking arrangements, e.g. impact-braking arrangements; Fall-retarding means, e.g. balloons, rockets for braking or fall-retarding
  • F42B10/52—Nose cones
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
  • F42B10/02—Stabilising arrangements
  • F42B10/22—Projectiles of cannelured type

Definitions

• the present invention relates to an ammunition projectile for a firearm, in particular a handgun, this projectile comprising a point and a base.
• the projectiles known from the prior art have various drawbacks. They are mostly lead-based, which has the effect of generating significant pollution in shooting ranges during training and competitions. In addition, when used in the field, they have kinetic energy which is dissipated only very slowly. Therefore, they are able, when used on public roads, to cross two people one behind the other, which makes them particularly dangerous. They are therefore incompatible with use by the police.
• the publication FR-A-2 527 764 describes an exercise shell used for shooting training and the adjustment of artillery pieces.
• This exercise shell is notably intended to simulate, over short distances, real shots of longer ranges in order to identify the causes of inaccuracies in the shot and to make adjustments to the weapon.
• the accuracy of the shell firing over short distances is impaired.
• the shell has an interior recess, an end provided with a flat and a recess intended to modify the center of gravity of the shell.
• the recess is provided asymmetric so that the shell rotated by the stripes of the barrel deviates slightly from its trajectory. This shell does not guarantee the trajectory accuracy and is not suitable for handguns. This solution is therefore not satisfactory.
• Publication EP-A-0 015 574 describes a hunting projectile comprising helical grooves offering resistance to the rotation of the projectile during its trajectory.
• the helical grooves slow down its rotation on its trajectory, making it unstable and causing it to rock to the ground.
• the projectile thus stops running prematurely. Its maximum range is reduced.
• the helical grooves which provide a sharper impact hole do not have an immediate braking effect. This solution is therefore not satisfactory.
• the publication US-B-6 363 856 describes a handgun ammunition whose end has a flat.
• the projectile has a density lower than that of commonly used projectiles causing, during firing, a rapid decrease in the speed of the projectile to reduce its dangerous range.
• This ammunition further comprises a jacket which, upon impact detaches from the projectile, thereby giving it an excess of power simultaneously promoting its penetration into the target and its fragmentation so that the projectile does not reach other non-targeted targets. .
• the lightening of this projectile is obtained by the use of very light resins which considerably degrade its aerodynamics and reduce the precision of its trajectory. This solution is therefore not satisfactory.
• the publication FR-A-2 820 495 describes a projectile for ammunition with reduced range comprising a hollow body extended by a rounded warhead provided with a plurality of hollow impressions delimited by two planes forming a dihedron whose central edge is parallel to the axis of the warhead. These footprints in recesses are intended to slow down the rotation imparted to the projectile by the scratches of the barrel of the weapon.
• the projectiles are thus, as for publication EP-A-0 015 574, braked by destabilization. These projectiles therefore leave their mid-course trajectory, thus reducing their range. Braking is not immediate. This solution is therefore not satisfactory.
• the aim of the present invention is to overcome these drawbacks by proposing a handgun projectile, having a precise and reliable trajectory, limited penetration in soft medium, and which, according to the embodiment, is capable of crossing or be arrested by a bulletproof vest.
• a projectile as described in the preamble characterized in that the point has a substantially conical shape and comprises at least two recesses arranged substantially symmetrically, these recesses having a curvilinear profile from one edge to the other.
• the recesses preferably have a rounded base to allow the ammunition provided with this projectile to be used without hooking in an automatic weapon.
• the recesses can be formed by two curvilinear planes, the intersection of which is delimited by a radial edge.
• the point comprises a central flat whose diameter is advantageously comprised substantially between 10 and 50% of the diameter of the projectile at the base of the point and preferably between a quarter and a third of the diameter of the projectile.
• the tip and the base include a recess.
• the recess is arranged to receive a closure means.
• the projectile is made of a soft metal and in particular, advantageously of copper or one of its alloys.
• the closure means is made of hard metal to be able to absorb the stresses to which the projectile is subjected and for example steel.
• the recess comprises an at least partially threaded central zone and said closure means is a screw partially engaged in this central zone.
• the projectile is formed from a piece of brass.
• FIG. 1 represents an elevation view of a first embodiment of a projectile according to the invention
• FIG. 2 represents the projectile of FIG. 1 seen in axial section
• FIG. 3 is a top view of the projectile of FIG. 1,
• FIG. 4 represents an elevation view of a second embodiment of a projectile according to the invention
• FIG. 5 represents the projectile of FIG. 4 seen in axial section
• FIG. 6 is a top view of the projectile of Figure 4.
• the projectile according to the invention is mainly intended for public security services.
• a bulletproof vest in particular a bulletproof vest made up of twenty four plies of a synthetic sheet material such as for example that sold under the brand KEVLAR TM or any equivalent material having similar characteristics.
• the projectile 10 has an approximately conical tip 11 and a cylindrical base 12.
• the conical tip 11 has an apex angle of between 30 and 45 degrees and preferably approximately 38 degrees. It is provided with a more or less large central flat 13, of substantially circular shape, the diameter of which is between 10 and 50% of the diameter of the projectile at the base of the point 11 or of the base 12.
• the flat 13 has a diameter substantially between a quarter and a third of the diameter of the projectile 10.
• the tip 11 On its lateral face, the tip 11 has at least two recesses 14, arranged substantially symmetrically to each other with respect to axial planes, and obtained either by stamping, or by milling, or by any other suitable machining process.
• the tip 11 substantially frustoconical has five recesses 14, regularly spaced along axes 17 angularly arranged at seventy-two degrees each of the adjacent axes 17.
• the number of recesses 14 and their angular position may vary depending on the embodiments and depends in particular on the caliber of the projectile 10.
• Each recess 14 has a rounded base to allow correct feeding without catching the cartridge containing the projectile 10 in an automatic weapon.
• the recesses 14 have a curvilinear profile from one edge to the other. The absence of an axial edge makes it possible to prevent the rotation of the projectile 10 from being disturbed as soon as it leaves the barrel of the weapon.
• the projectile 10 is hollow and has a recess 15 which extends axially through the cylindrical base 12 and extends into the tip 11.
• This recess 15 has a frontal zone 15a in the shape of a point extended by a central zone 15b cylindrical which opens into an intermediate zone 15c of conical shape extended by a rear zone 15d cylindrical, the section of which is greater than that of the central zone 15b.
• the projectile 10 is preferably made of a relatively soft metal such as for example copper or one of its alloys.
• the projectile 10 described which was used for the tests has a diameter of 8.97 mm in caliber 9 mm parabellum and weighs 5.6 grams.
• the initial speed in a GLOCK 19 brand pistol having a 10 cm barrel is 400 m / s, ie a kinetic energy of approximately 450 joules.
• the particular profile of the tip 11 of frustoconical shape which is the least aerodynamic as well as the presence of the central flat 13 and of the recesses 14 have the effect of ensuring a significant braking of the projectile 10 on its trajectory in the air and of reducing its penetration into a soft environment without altering the accuracy of its trajectory.
• the average penetration of projectile 10 into the reference medium, namely 10% gelatin is 45 centimeters. This corresponds to a reduction of around 40% compared to what is obtained with ordinary armored bullet ammunition.
• the projectile 10 according to the invention is braked due to its poor index of penetration into the air, while keeping a well-controlled trajectory.
• the result of this braking is a reduction in penetration in a soft environment, this penetration being lower the greater the firing distance.
• the maximum range is around 1200 meters while that of known projectiles is around 1800 meters.
• a sealing means 16 for example a steel screw, in particular a screw of the PARKER TM type with conical head can be engaged in the rear zone 15d cylindrical and the central zone 15b of the recess 15.
• This screw can be replaced by any other closing means such as a hard metal stud driven into the rear zone 15d of the recess 15.
• the means of obturation 16 is a screw, the central zone is at least partially threaded so that this screw can be fixed by screwing.
• the intermediate zone 15c and the rear zone 15d are arranged to receive the head of this screw.
• the diameter of the passage opening is approximately two millimeters.
• the rubber curtains commonly used as protection in shooting ranges can be maintained with this projectile 10, so that the same ammunition can be used both outside by the security services and in the shooting ranges for training.
• the ammunition is non-polluting since it does not contain lead.
• the fact that the projectile 10 is hollow makes it possible to guarantee that it does not puncture a bulletproof vest of twenty four plies of KEVLAR TM or its equivalent.
• the recess 15 has a diameter of the order of three millimeters in its central zone 15b and is extended in the tip 11 to allow the deformation of the latter at the time of impact.
• the tip 11 of the projectile 10 also deforms on impact on a vehicle windshield. However, the crossing of this screen by the projectile 10 is done without significant loss of mass and the closure means 16 remains in place.
• the projectile 20 has an approximately conical point 21 and a substantially cylindrical base 22. Unlike the tip 11 of the projectile 10, the tip 21 is not provided with a central flat 13. On its lateral face, the tip 21, substantially conical, has at least two recesses 24, arranged symmetrically with respect to each other. axial planes, and obtained either by stamping, or by milling, or by any other suitable machining process. The embodiment described and shown shows (see Figure 6) that the substantially conical tip 21 has five recesses 24, regularly spaced along axes 25 angularly arranged at seventy-two degrees each of the neighboring axes.
• the number of recesses 24 their angular position can vary according to the embodiments and depends in particular on the caliber of the projectile 20.
• Each recess 24 has a rounded base to allow correct feeding without catching the cartridge containing the projectile 20 in an automatic weapon.
• the recesses 24 have a curvilinear profile from one edge to the other. The absence of an axial edge makes it possible to prevent the rotation of the projectile 20 from being affected as soon as it leaves the barrel of the weapon.
• the projectile 20 also differs from the projectile 10 in that it does not have a central recess 15. It is solid and preferably made of brass or a similar alloy as regards the physical characteristics with the exception of a lead containing alloy. Its manufacture can be done by cold or hot stamping and the recesses 24 can be made by any suitable machining. The tests were carried out with a projectile 20 as described of 8.97 mm in diameter in caliber 9 parabellum which weighs 5.6 grams and at an initial speed in the pistol of the brand GLOCK 19 having a barrel of ten centimeters, is 400m / s or an energy of about 450 joules.
• this projectile 20 on its trajectory is substantially the same as that of the projectile 10 except that its braking is less due to the absence of a central flat on the tip 21. Furthermore, its perforation capacity is significantly higher since the tests have revealed that it crosses at least forty-eight plies of KEVLAR TM or its equivalent.
• the two projectiles 10 and 20 have different performances as regards their capacity to perforate bullet-proof vests.
• the projectile 10 is arranged to be stopped by a bulletproof vest and the projectile 20 is arranged to pass through it.
• the recesses are in even number and arranged symmetrically with respect to the axis of the projectile.
• the recesses are formed by two curvilinear planes defining between them a radial edge. This radial edge being in the direction of rotation of the projectile, it does not affect the speed of rotation of the projectile nor the precision of its trajectory.

Landscapes

• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)
• Toys (AREA)
• Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
• Synchronizing For Television (AREA)
• Vending Machines For Individual Products (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)

Applications Claiming Priority (3)

Publications (2)

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Family Applications (1)

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• 2002
  • 2002-10-17 FR FR0212922A patent/FR2846084B1/fr not_active Expired - Fee Related
• 2003
  • 2003-10-15 WO PCT/FR2003/003036 patent/WO2004036140A2/fr not_active Ceased
  • 2003-10-15 CA CA002502466A patent/CA2502466A1/fr not_active Abandoned
  • 2003-10-15 DE DE60326975T patent/DE60326975D1/de not_active Expired - Lifetime
  • 2003-10-15 AT AT03776967T patent/ATE427473T1/de not_active IP Right Cessation
  • 2003-10-15 EP EP03776967A patent/EP1552241B1/de not_active Expired - Lifetime
  • 2003-10-15 US US10/531,490 patent/US7484459B2/en not_active Expired - Fee Related
  • 2003-10-15 AU AU2003286224A patent/AU2003286224A1/en not_active Abandoned

Non-Patent Citations (1)

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