RU2389963C2 - Barrel to fire rubber bullets - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: proposed barrel comprises bore limited by diametre D and taper in muzzle part limited by diametre d. In compliance with the first version, barrel bore comprises one spherical ledge directed inward. Distance from said ledge to barrel bore opposite wall equals H. In compliance with second version, barrel bore has two spherical ledges directed inward, the distance from one ledge to opposite bore wall of to opposite ledge being equal to H. Note here that centers of said ledges are located in one plane perpendicular to barrel bore lengthwise axis. Barrel bore shall satisfy the following condition: D/2 ≤ H ≤ d.

EFFECT: no possibility to fire metal bullets.

2 cl, 4 dwg

Description

The invention relates to weapons technology, and in particular to trunks for firing ammunition with a rubber bullet for self-defense weapons (pistols and revolvers).

A device for shooting (patent RU No. 2265176), taken as a prototype, which relates to firearms used as self-defense weapons, is known. This device allows for firing of cartridges with a rubber bullet, while the possibility of firing a cartridge with a metal bullet, the specific energy of which is more than 0.5 J / mm ² , should be excluded. The principle of operation of this device is based on processes of a sharp change in the geometry and spatial position of massive (e.g., lead) equipment in the radial (lateral) direction during the shot, which will cause an abrupt increase in the pressure of powder gases, which under certain conditions will lead to deformation or destruction of weapon parts.

The disadvantage of the prototype is that lead has a high ductility in comparison, for example, with steel, so an abrupt increase in pressure will most likely lead to an increase in the equipment speed. As a result, the specific energy of the equipment will exceed the established 0.5 J / mm ² .

The problem to which the invention is directed is the creation of a civilian self-defense weapon, which makes it possible to fire only with cartridges with a rubber (elastic) bullet and excludes the possibility of firing metal (hard) bullets. In the case of firing with metal bullets, the specific kinetic energy of the metal bullet should not be more than 0.5 J / mm ² , which meets the criminalistic requirements of the Ministry of Internal Affairs of the Russian Federation.

The problem is solved using a barrel for firing ammunition with a rubber bullet.

1. The barrel for firing ammunition with a rubber bullet (option 1), containing a barrel with one protrusion, characterized in that the barrel is narrowed in the muzzle, and the protrusion is made spherical, with the following condition:

Where

D is the restrictive diameter of the bore;

d is the restrictive diameter of the narrowing in the muzzle;

H is the distance from the protrusion to the opposite wall of the barrel channel.

2. The barrel for firing ammunition with a rubber bullet (option 2), containing a bore with two projections, characterized in that the bore is narrowed in the muzzle, and the protrusions are made spherical with centers lying in one plane perpendicular to the longitudinal axis of the channel trunk, while the following condition is true:

Where

D is the restrictive diameter of the bore;

d is the restrictive diameter of the narrowing in the muzzle;

H is the distance from the protrusion to the opposite wall of the bore or the opposite protrusion.

Variants of technical solutions are presented in figures 1-4.

Figure 1 shows the barrel for firing ammunition with a rubber bullet, figure 2 - section aa in figure 1, where

1 - trunk;

2 - ledge;

D is the restrictive diameter of the bore;

d is the restrictive diameter of the narrowing in the muzzle;

H is the distance from the protrusion to the opposite wall of the channel.

In Fig.3 shows a second variant of the barrel for firing ammunition with a rubber bullet, in Fig.4 a section aa in Fig.3, where

1 - trunk;

2 - ledge;

D is the restrictive diameter of the bore;

d is the restrictive diameter of the narrowing in the muzzle;

H is the distance from the protrusion to the opposite wall of the bore or the opposite protrusion.

For all options, the following condition is true:

When fired from a firearm with the above options for trunks cartridges with a rubber (elastic) bullet, the following occurs:

- under the influence of powder gases, the bullet moves along the bore, acquiring acceleration;

- having met on its way a spherical protrusion, a bullet flows around this protrusion due to the plastic and elastic properties of rubber, spending a minimum of kinetic energy on it, restores its shape. Since the breakthrough of powder gases does not occur, the bullet continues to accelerate;

- Continuing movement, the bullet gets narrowed in the muzzle, since the breakthrough of powder gases does not occur, continues to move accelerating.

When a cartridge is fired from this weapon with a metal (hard) bullet whose caliber is D, the following occurs:

- under the influence of powder gases, the bullet moves along the barrel, acquiring acceleration;

- having met one or two spherical protrusions on its way (depending on the embodiment), the bullet begins to plastically deform, significantly spending kinetic energy on it. After the protrusion on the pool, one or two longitudinal grooves are formed (depending on the embodiment) through which the outflow of powder gases occurs, which leads to a decrease in the pressure of the powder gases and, as a result, a decrease in the acceleration of the bullet;

- while continuing to move, the bullet encounters a narrowing in the muzzle, in which, due to plastic deformation, the size of the bullet decreases from D to d, spending kinetic energy on it, while in the existing groove or grooves due to an abrupt increase in pressure, due to the braking of the bullet when meeting an obstacle, a more intense outflow of gases occurs, as a result, a more intense pressure drop of the powder gases occurs. Since the process of plastic deformation and pressure drop occurs simultaneously, the acceleration of the bullet is significantly reduced - at the exit from the barrel a rigid (metal) bullet has a specific kinetic energy of not more than 0.5 J / mm ² , which meets the criminalistic requirements of the Ministry of Internal Affairs of the Russian Federation.

The restrictive diameter of the barrel channel D, the restrictive diameter of the narrowing of the muzzle d and the distance H from the protrusion to the opposite wall of the barrel or the opposite protrusion are determined constructively, based on the working conditions of the self-defense weapon (pistol or revolver) and compliance with the criminalistic requirements of the Ministry of Internal Affairs of the Russian Federation.

Claims (2)

1. The barrel for firing ammunition with a rubber bullet containing a channel with one protrusion, characterized in that the barrel is made narrowing in the muzzle, and the protrusion is made spherical, with the following condition: D / 2≤N≤d, where D - the restrictive diameter of the bore, d - the restrictive diameter of the narrowing in the muzzle, N is the distance from the protrusion to the opposite wall of the bore. 2. The barrel for firing ammunition with a rubber bullet, containing a channel with two protrusions, characterized in that the barrel is made narrowing in the muzzle, and the protrusions are made spherical with centers lying in one plane perpendicular to the longitudinal axis of the barrel, the following condition: D / 2≤H≤d, where D is the restrictive diameter of the bore, d is the restrictive diameter of the narrowing in the muzzle, H is the distance from the protrusion to the opposite wall of the bore or the opposite protrusion.

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