Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
  • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
  • F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
  • F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
  • F42B12/32—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction the hull or case comprising a plurality of discrete bodies, e.g. steel balls, embedded therein or disposed around the explosive charge
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
  • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
  • F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
  • F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
  • F42B12/24—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction with grooves, recesses or other wall weakenings

Definitions

• the present invention relates to an improvement to the grenades used, for example in conjunction with tear gas, for dispersing crowds.
• International application WO 97/18435 discloses a pomegranate of this type, fragmentable into several projectiles of kinetic energy sufficiently weak not to cause serious injury to persons affected thereby.
• This grenade has an inner sheath and nonmetallic projectiles individually secured to this sheath and surrounded by a heat-shrinkable envelope.
• Such a grenade requires the unitary manufacture of the projectiles, then their assembly on the inner sheath, which has repercussions on the cost of manufacture.
• the outer shell may hinder the dispersion of the projectiles.
• the invention meets this need by proposing a new fragmentable grenade, comprising: an explosive charge, a sheet of elastically deformable projectiles interconnected by material bridges integrally molded with the projectiles, this sheet surrounding the charge and being configured to to allow, during the explosion of this one, the separation and the dispersion of the projectiles.
• a new fragmentable grenade comprising: an explosive charge, a sheet of elastically deformable projectiles interconnected by material bridges integrally molded with the projectiles, this sheet surrounding the charge and being configured to to allow, during the explosion of this one, the separation and the dispersion of the projectiles.
• the presence of the projectile sheet simplifies the manufacture of the grenade, since the projectiles do not have to be manufactured or assembled individually.
• the sheet can still be used to optimize the volume of the grenade, that is to say, for the same external size to increase the mass of the projectiles, or mass projectiles equal, reduce the caliber of the grenade.
• the sheet comprises two assembled edges, preferably by gluing.
• the grenade can thus comprise half-projectiles assembled along an assembly line.
• the projectiles thus reconstituted may have ballistic characteristics very similar to those of the other projectiles of the sheet, which are monohthical.
• the material bridges may be located on the outside of the web.
• the material bridges may be located on the inside of the web or elsewhere.
• the thickness of the bridges of material may be chosen according to the mechanical characteristics of the material used to mold the sheet and may represent less than 10%, better less than 5% of the maximum thickness of the projectiles.
• the projectile web may be devoid of openwork, or alternatively may include openings, including openings extending between the material bridges. The projectiles are advantageously devoid of sharp edges, so as to limit the risk of serious injury during impact.
• the projectiles have radially inner and outer faces each at least partially substantially in the form of cylinder portions and, between them, substantially planar and radial faces.
• the web defines an inner housing in which the explosive charge is placed.
• the grenade may include a detonator and a device for retarding ignition.
• the inner housing can house the detonator and the possible ignition retarder, which is sold in the trade under the name of "self-timer igniter plug" and can have a screw or clip interface for launching manual of the grenade if it is equipped with a lever equipped with a safety pin, ie the launching with a firearm, generally a rifle, if it is equipped with a cap of self-propulsion and d a percussion primer.
• the inner housing may have at its axial ends enlarged portions, and one of them can receive at least partially the detonator.
• the elastically deformable material in which the projectiles are made may have a hardness of, for example, between 20 and 55 Shore A, in particular between 35 and 45 Shore A, or even about 40 Shore A, and be for example FEPDM, or any another suitable elastomer, natural or synthetic.
• the material used may optionally be supplemented with chemicals intended to improve the physical or chemical qualities, during manufacture or after.
• the elastically deformable material may, for example, comprise a filler of a compound making it possible to reduce the coefficient of friction of the grenade, for example graphite or PTFE.
• the elastically deformable material may also include, where appropriate, metal particles or not, a composite material or plastic.
• the added particles may, for example, make it possible to increase or reduce the density of the projectiles, for example they may make it possible to reduce the elasticity of the elastically deformable material, which may, for example, make it easier to break the bridges of material during the explosion of the load, for example an elastically deformable material having particles having dynamic characteristics comparable to those of biological tissues may be used, for example using materials similar to those usually used for cosmetic surgery prostheses, or exhibiting
• At least one projectile may contain an agent, for example a powder, a liquid or a gas, intended to produce a physiological effect, for example CS or capsicum, This agent may for example be contained, in particular at encapsulated state, in a cavity defined by at least one projectile.
• the grenade can be configured to be launched with a grenade launcher.
• its firing can be caused for example by the impact on the target or on the ground.
• the firing can be linked to a pyrotechnic chain triggering the shot of the grenade launcher.
• the grenade may further include, if necessary, a guide shoe or overscaling to improve the coefficient of friction and the rear seal.
• a shoe can also be used to launch grenades of an undersized caliber with an existing grenade launcher, configured to launch grenades of a higher caliber.
• the invention further relates, independently or in combination with the foregoing, to a method of manufacturing a projectile web comprising the following step: molding with an elastically deformable material, in particular a natural or synthetic elastomer, a projectile layer with between them material bridges bringing them together.
• an elastically deformable material in particular a natural or synthetic elastomer
• a projectile layer with between them material bridges bringing them together.
• the projectile sheets can each be monolithic.
• Each web may have been molded flat, being for example of generally rectangular shape, then rolled and glued edge to edge, the two edges before gluing each comprising for example a row of half-projectiles.
• a projectile sheet used to make a grenade can be molded in one piece with an annular shape in an elastically deformable material, then demolded by its elasticity, for example by externally applying a pressure lower than the existing pressure on the inner side of the projectile sheet, or by applying internally an overpressure. If appropriate, whatever the molding process used, the web may be dipped in a bath of a compound to reduce the coefficient of friction of the pomegranate, for example PTFE or the like.
• the invention also relates to a method of assembling a fragmentable grenade, comprising: providing a sheet of projectiles connected by material bridges integrally molded with the projectiles, - the placement of an explosive charge in an inner housing defined by the tablecloth.
• FIG. perspective view, schematic and partial, of a fragmentable grenade according to the invention FIG. 2 represents in isolation and in perspective a sheet of projectiles used to manufacture the grenade of FIG. 1
• FIG. 3 is a partial, schematic transverse section of the projectile sheet of FIG. 1
• FIG. represents in isolation in longitudinal section the projectile layer of FIG. 1.
• FIG. 1 shows a fragmentable grenade 1 comprising a sheet 4 of projectiles 5 interconnected by material bridges 6, integrally molded with the projectiles 5.
• the sheet 4 surrounds an explosive charge 2, contained in a tube 3, and known per se.
• the sheet 4 is configured to allow, during the explosion of the load 2, the separation and the dispersion of the projectiles 5.
• FIG. 2 shows separately the sheet 4 of projectiles, on the inner side and 5.
• the sheet 4 has, when flattened for the purposes of observation, a generally rectangular shape and comprises for example three rows of projectiles 5, each of which comprises five projectiles. 5 integers and two half projectiles 5a, 5b.
• the grenade 1 comprises thus three stages of projectiles each comprising six projectiles distributed circumferentially, as can be seen in Figure 4, eighteen projectiles in total. Of course, it is not beyond the scope of the present invention when the grenade comprises a different number of projectiles, for example between twelve and twenty four projectiles.
• the material bridges 6 are located on the outside of the grenade 1. Their thickness e represents in the example considered less than 5% of the maximum thickness E of the projectiles, in this case about 4% of the maximum thickness E , as can be seen in Figure 3.
• each projectile 5 has in cross section, as illustrated in FIG. 3, radially outer 11 and inner 12 substantially concentric sides joined by substantially radial sides 13 and 14 converging towards the center of the grenade 1.
• the grenade 1 is generally symmetrical with respect to planes containing its longitudinal axis X.
• the sheet 4 defines an inner housing 15 in which the explosive charge 2 is placed.
• This inner housing 15 has a first portion 15a, substantially cylindrical, of a first radius Ri, and in this first portion a second enlarged portion 15b, with two substantially cylindrical stages of respective radii R 'and R 2 with
• the housing 15 further comprises a third enlarged portion 15c, substantially cylindrical, radius R 3 > R 1, intended for example to receive a ring for fixing the explosive charge 2 in the middle of the sheet 4 of projectiles 5.
• the tube 3 s tightly adjusts in the housing 15, and the ply 4 by deforming elastically can contribute to retain the tube 3 in the grenade 1.
• the ply 4 is made of an elastically deformable material, which is in the example described a hardness between 20 and 55 Shore A, especially between 35 and 45 Shore A, or even about 40 Shore A.
• the material used is, for example, FEPDM.
• the elastically deformable material may comprise a charge of a compound making it possible to reduce the coefficient of friction of the outside of the grenade, for example graphite or PTFE.
• the elastically deformable material may comprise metal particles, made of composite material or plastic material.
• At least one of the projectiles may contain an agent such as a powder, a gas or a liquid, intended to produce a physiological effect, in particular CS or capsicum.
• the material bridges 6 connect the projectiles 5 without forming apertures, but it is not beyond the scope of the present invention when for example the bridges of material 6 define apertures which may for example facilitate the detachment of the projectiles 5 from each other during the explosion of the explosive charge.

Landscapes

• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
• Materials For Medical Uses (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• Catching Or Destruction (AREA)
• Air Bags (AREA)
• Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
• Toys (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
• Tires In General (AREA)
• Bridges Or Land Bridges (AREA)
• Ultra Sonic Daignosis Equipment (AREA)
• Steering Devices For Bicycles And Motorcycles (AREA)
• Peptides Or Proteins (AREA)
• Tents Or Canopies (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (13)

Cited By (1)

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Citations (4)

Family Cites Families (7)

• 2004
  • 2004-03-16 FR FR0450527A patent/FR2867849B1/fr not_active Expired - Fee Related
• 2005
  • 2005-03-11 WO PCT/FR2005/050157 patent/WO2005093364A1/fr active IP Right Grant
  • 2005-03-11 BR BRPI0508827-5A patent/BRPI0508827A/pt not_active IP Right Cessation
  • 2005-03-11 CA CA002559884A patent/CA2559884A1/fr not_active Abandoned
  • 2005-03-11 PL PL05739413T patent/PL1728042T3/pl unknown
  • 2005-03-11 EP EP05739413A patent/EP1728042B1/de active Active
  • 2005-03-11 ES ES05739413T patent/ES2296168T3/es active Active
  • 2005-03-11 PT PT05739413T patent/PT1728042E/pt unknown
  • 2005-03-11 DK DK05739413T patent/DK1728042T3/da active
  • 2005-03-11 US US10/592,935 patent/US20080156220A1/en not_active Abandoned
  • 2005-03-11 AT AT05739413T patent/ATE374353T1/de not_active IP Right Cessation
  • 2005-03-11 DE DE602005002639T patent/DE602005002639T2/de not_active Expired - Fee Related
• 2007
  • 2007-12-27 CY CY20071101632T patent/CY1107110T1/el unknown

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