RU2300723C2 - Small arms barrel cartridge with elastic bullet - Google Patents

Abstract

FIELD: small arms barrels for a cartridge with an elastic bullet.

SUBSTANCE: the bore is made with a longitudinal corrugation, the corrugations are symmetrical relative to the barrel longitudinal axis in its each cross-section. In a special case, the barrel may be made of fastened outer cylindrical and inner corrugated pipes.

EFFECT: prevented fire by rigid (metal) bullets or makes it ineffective.

2 cl, 3 dwg

Description

The invention relates to weapons technology, namely to trunks for small arms (mainly civilian firearms) under a cartridge with an elastic (in particular, rubber) bullet.

The trunks of small arms are made, as a rule, cylindrical, straight [1].

Exceptions to this rule include well-known technical solutions with a conical (tapering) channel, widespread smooth trunks of hunting rifles with local narrowing before the cut - the so-called choke, in particular with a strong choke with a diameter difference of 1.25 mm [2, p. 116-117], and cylindrical curved trunks or nozzles to them (for firing from cover) [3].

Among rifled trunks, devices with oval cutting (causing an asymmetric shape of the bore in each cross section) and with segment cutting (causing a symmetrical shape of these sections) are known [2, p.136, Fig. 30, pos. 4 and 3, respectively].

All of these barrels can be used when shooting with both hard (metal) penetrating bullets and elastic (rubber) traumatic bullets. This limits the possibility of their use as a weapon of self-defense of traumatic action in accordance with the criminalistic requirements of the Ministry of Internal Affairs of the Russian Federation.

It is required to create a weapon of traumatic action, from which it would be technically possible to shoot with elastic, but not rigid bullets.

Such attempts are known.

The closest to the claimed technical solution for the purpose and in the aggregate of its essential structural features is a small arms barrel under a cartridge with an elastic bullet of traumatic action, containing a longitudinally corrugated channel [4].

In it, the corrugations are made asymmetric with respect to the longitudinal axis of the barrel in each of its cross sections along the length of the corrugated section (corrugated sections), which gives the barrel a labyrinth shape that excludes the possibility of movement in general or full acceleration of a rigid bullet in it. An elastic bullet, on the contrary, has the ability to move in a channel with satisfactory speed parameters, being relatively easily deformed when passing through a corrugation maze. Moreover, in the description of the prototype device, the trunk is presented in the form of a single pipe (not a bonded barrel).

However, the prototype device is characterized by disadvantages due to asymmetric corrugation. The internal ballistics of a bullet in such a labyrinth is characterized by a trajectory close to a sinusoid (with alternating transverse displacements relative to the longitudinal axis of the barrel). In this case, firstly, the force of dynamic pressure on the walls of the barrel channel (on the inner walls of the corrugated sections) contains an alternating transverse component, and quite significant in magnitude, especially with a relatively large coefficient of elasticity of the bullet material. Secondly, the center of mass of the bullet also has an alternating lateral displacement. All this will negatively affect the stability of the position of the longitudinal axis of the barrel and will require additional, difficultly implemented measures for lateral stabilization of the barrel, will increase the deviation of the bullet from the calculated trajectory in the external ballistic section.

The task to which the claimed invention is directed is to improve the technical and operational (combat) characteristics of traumatic small arms with a corrugated barrel by eliminating the unbalanced transverse force and inertial effects of the bullet on the walls of the barrel channel.

The solution to this problem is achieved by the fact that in the barrel of a small arms chambered with an elastic bullet containing a longitudinally corrugated channel, the corrugations are made symmetrical with respect to the longitudinal axis of the barrel in each cross section thereof.

The solution to this problem is also achieved due to an additional structural feature (with the main set of features formulated above): the barrel can be made fastened, including an external cylindrical and internal corrugated pipe.

Among the known devices and methods, no such combination of essential features would coincide with the declared one. At the same time, it is due to the latter that a new technical result is achieved in accordance with the task.

The drawings depict the claimed barrel (single or bonded, with an inner corrugated pipe) with one of the possible examples of the profile shape of the longitudinal section of the corrugated section:

figure 1 shows a longitudinal section of the trunk;

figure 2 - sections aa and bb of figure 1;

figure 3 is a longitudinal section of a fastened trunk.

The barrel (or inner tube of the bonded barrel) 1 of a small arms chambered with an elastic bullet of traumatic action, with a longitudinal axis 2, is made with a longitudinally corrugated channel 3 formed by the inner wall 4 of the barrel 1.

The corrugations 5 are made symmetrical about the axis 2 in each cross section thereof, for example, sections A-A and B-B of FIG. 1 (see FIG. 2).

Alternatively, the barrel may be made bonded, including an inner corrugated pipe 1 (with channel 3) and an outer pipe (casing) 6 covering it (see FIG. 3). To prevent axial shift of the pipe 1 relative to the pipe 6 due to the interaction of the bullet with the corrugations 5, the pipe 6 should cover the pipe 1 with an interference fit. To strengthen the axial fixation, additionally developed (in comparison with the corrugations 5) corrugations (crimping) of the casing pipe 6 (not shown in FIGS. 1-3) can be additionally provided.

The geometry of the corrugation 5 and the step between the corrugations 5 as depending on many parameters (diameter and length of the channel, thickness and material of the barrel (pipe) 1, geometric dimensions and material of the bullet, weight of gunpowder, etc.) is determined in each case and requires optimization in the process of calculation-theoretical and experimental work.

The described examples do not exclude other structural embodiments of the device in the framework of the claimed combination of essential features set forth in the claims.

The inventive device operates as follows.

When shooting elastic, in particular rubber, bullets under the pressure of powder gases (other gas or liquid media or under the influence of other throwing means in the case of non-pistol weapons), the bullet, moving along channel 3 along axis 2, successively overcomes the narrowing of channel 3 - corrugation 5 beyond account mainly of its elastic deformation of compression. Moreover, the force acting on the front inclined wall of the corrugation 5 (as, incidentally, the subsequent action on its other walls), being variable, has transverse components (i.e., perpendicular to axis 2), symmetrical about axis 2 and, correspondingly, giving zero transverse resultant. In addition, the center of mass of the bullet theoretically does not deviate from axis 2 along the entire length of the barrel (pipe) 1.

Thus, the use of the invention allows to exclude the unbalanced transverse force and inertial effects of the bullet on the walls of the barrel channel, which are characteristic of the prototype, which leads to an improvement in the technical and operational (combat) characteristics of traumatic small arms with a corrugated barrel.

Information sources

1. Sports and hunting weapons: Catalog VO RAZNOEXPORT SSSR, MOSKVA, 1972. - P.14 (product IZH-17).

2. Mikhailov L.E. Small Arms: Terminological Dictionary. M .: "USSO", 1998. - S.116-117, 136.

3. Special, unusual, exotic weapons: Illustrated guide. / A.N. Ardashev, L.S. Fedoseev. - M.: Publishing House Asm-trel LLC: Publishing House ACT, 2001. - 320 pp., Ill. (Military equipment). - p. 9.

4. RU 2253816 C1, F41A 21/16, 11/25/2003 (prototype).

Claims (2)

1. The barrel of small arms under the cartridge with an elastic bullet, the channel of which is made longitudinal corrugation, characterized in that the corrugations are made symmetrical with respect to the longitudinal axis of the barrel in each cross section thereof. 2. The barrel according to claim 1, characterized in that it is made of bonded external cylindrical and internal corrugated pipes.

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