Munition for low-pressure firing of projectiles from large-calib

Ammunition and explosives – Cartridges – Projectile structure

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Details

102334, 102367, 102430, 102447, 102470, 102502, 102529, F42B 502

Patent

active

054027292

DESCRIPTION:

BRIEF SUMMARY
The invention relates to the field of munitions engineering.
Munitions for large-caliber firearms are known which are designed to fire various projectiles, these are generally made to avoid penetration on impact with the human target and are therefore non-lethal munitions.
The projectiles used are fragile and it is therefore not possible to use propulsion systems that necessitate high-pressure pyrotechnics. Such projectiles must therefore be fired at low pressure.
To achieve this, it is possible to use gunpowder which has a fast, complete combustion range at a relatively low pressure. However, gunpowder creates smoke and significant residues.
In an attempt to overcome these drawbacks, a munition has been proposed comprising a cylindrical shell in one end of which a projectile is fitted whereas the other end has a concentric chamber accommodating a small sized cartridge. The chamber has a constant, uniform inside diameter over its entire length which matches that of the cartridge in order to prevent any high pressure being reached. The cartridge is filled with pyroxylin powder and has a detonator made of a fulminate compound.
This state of the art is described in patent FR2630603.
This solution has very considerable advantages but is not entirely satisfactory. In fact, the explosive does not burn completely and does not always provide an adequate increase in pressure.
The purpose of the invention is to overcome these disadvantages in a simple, reliable, effective and rational way.
The problem that the invention intends to solve is to obtain an increase in pressure in order to impart velocity to the projectile without thereby damaging it. In particular, the problem that the invention intends to solve is to increase the pressure in the cartridge rather than in the chamber that accommodates the projectile.
In order to solve such a problem, a munition was designed and developed comprising a cylindrical shell of which one closed end has a coaxially concentric chamber suitable to accommodate a means of propelling a projectile fitted in said shell, the means of propulsion consisting of a "blank" cartridge housed in a diffusing device with the cartridge and diffuser device assembly being inserted into the coaxial chamber of the shell.
The diffusing device has a coaxial chamber in which the cartridge is inserted.
In order to solve the problem of preventing any increase in pressure in the chamber, the chamber of the diffusing device communicates with oversized lateral openings around the periphery of which the sum of the cross-sectional areas exceeds the nominal cross-sectional area of said chamber.
Using this basic design, the munition can fire any type of projectile made from a solid body made of flexible material or comprising flexible envelopes containing a liquid.
Nevertheless, preferably and according to another feature of the invention, the projectile consists of a cylindrical body enclosing an internal space suitable for containing means of "crowd dispersal" capable of being released under the effect of destruction of said body in combination with a detonator controlled by a delay element.
The detonator is mounted in a cylindrical recess formed coaxially at one of the ends of the body so that it can be ignited by the gases from the cartridge/diffuser assembly.
In order to solve the problem of maintaining the means of crowd dispersal inside the body, the end of the body opposite to that which accommodates the detonator is sealed by a cover.
In order to solve the problem of limiting the drift of the trajectory of the projectile due to the effect of the thrust of air, the cover has concentric grooves and a central non-opening recess.
In order to solve the problem of encouraging bursting of the body, the latter has grooves formed along the generating lines of the body.
Advantageously, the means of crowd dispersal consist of CS powder, iron shot or liquid.
The invention is explained below in more detail, reference being made to the accompanying drawings in which:
FIGS. 1A, 1B and 1C are cross-sectional view showin

REFERENCES:
patent: H114 (1886-08-01), Quintavalle
patent: 1819090 (1931-08-01), Goss
patent: 3157126 (1964-11-01), Blondeau
patent: 3707918 (1973-01-01), Dunfee et al.
patent: 3713383 (1973-01-01), Crescenzo et al.
patent: 3771451 (1973-11-01), Woodring
patent: 3983817 (1976-10-01), Tucker
patent: 4938146 (1990-07-01), Gunther et al.
patent: 5035138 (1991-07-01), Luxton

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