RU2186314C1 - Small arms blank fire bushing - Google Patents

Abstract

FIELD: military equipment, applicable in small arms blank fire devices. SUBSTANCE: the blank fire bushing has a body and an auxiliary bushing that is movable relative to the body. The auxiliary bushing has a cone entering the cone of the barrel or flash absorber of the weapon, and a seat for the wrench, for example, a groove for screwing of the auxiliary bushing in the body and producing of a preload in the joint of the cones. The body and the auxiliary bushing make up a self-adjusting system relative to the cone of the barrel or flash absorber. EFFECT: enhanced strength of the bushing, its operating reliability, prevented clogging of the ejection ducts by a powder carbon deposit at firing with a blank fire bushing. 5 dwg

Description

 The invention relates to the field of military equipment and is aimed at creating devices for firing blank cartridges, for example, from a machine gun.

 To simulate shooting from small arms, blank cartridges are used, that is, cartridges without bullets, including an encapsulated sleeve and gunpowder. In some cases, with the equipment of such cartridges, plastic bullets are used, which are destroyed when shot even in the barrel. Given the low pressure of the powder gases in the barrel when firing such cartridges, to ensure the operation of automatic weapons on the muzzle of the barrel set sleeve for idle firing, which is a gas throttle, because in the sleeve, the cross-sectional area of the bore is substantially reduced. When a gas stream meets a reduced channel section, the pressure in the stream increases and a wave of increased pressure arises, which propagates backward through the stream, i.e. to the chamber. As a result of the indicated gas flow in the blank firing sleeve, the pressure of the powder gases and the time of their action on the piston of the bolt frame are rebuilt, which ensures the acceptable operation of the weapon automation.

 Examples of such a solution are bushings for blank firing for AK, AKM, AK-74, and other machine guns and PC, PKM, and other machine guns [1]. Bushings for these types of weapons are screwed onto the muzzle of the barrel and fixed with a retainer.

 Known sleeve for idle shooting to a machine gun with an ejector on the barrel [2], made in the form of a housing with an annular protrusion that overlaps the barrel with a central hole in this protrusion. In this case, the annular protrusion is made in the form of an additional part, which is rigidly fixed in the housing. The sleeve body is screwed onto the muzzle of the barrel. The specified design of the sleeve is a prototype of the invention.

The disadvantages of the known design are:
- insufficient structural strength;
- unsatisfactory obturation of the bore in connection with the sleeve, therefore, when firing, not only the threaded connection (the attachment point of the sleeve to the weapon), but also the ejection channels is contaminated, therefore, the design of the sleeve provides for the discharge of bursting powder gases through additional holes in the housing;
- bursting powder gases cause erosion of the muzzle of the barrel and the inside of the sleeve.

 The aim of the invention is to improve the operational characteristics of the blank bushing for a machine gun with ejection cooling of the barrel.

 This goal is achieved by the fact that the additional sleeve is made with the possibility of self-regulation of its position relative to the body, and on its outer surface from the side of the attachment point to the weapon there is a cone mating with the conical surface of the barrel or flame arrester, while the body, additional sleeve and front sight block form a self-aligning system relative to these cones.

The dry connection of the body with the weapon and the thread on the body and the additional sleeve allow:
- fix the housing in the required position and due to the thread ensure tightness in conjugation of the additional sleeve and the cones of the barrel or flame arrester;
- perform an additional sleeve or housing of any length and color (coating) in order to ensure visual visibility of the presence of the sleeve on the weapon.

 The necessary interference and conical surface of the rear of the sleeve provide a complete obturation of the powder gases and sufficient strength of the additional sleeve in the initial section (in the rear of the additional sleeve).

 In FIG. 1 shows a sleeve for idle firing in the context; in FIG. 2 - view of the sleeve from the mount to the machine gun; in FIG. 3 - a view And on a turnkey groove; in FIG. 4 - blank firing sleeve mounted on the muzzle of the machine gun; in FIG. 5 - section BB on the flame arrester and the blanking sleeve.

 The sleeve for idle shooting consists of a housing 1 and an additional sleeve (throttle) 2, movable relative to each other, for example, through a threaded connection 3. On the additional sleeve 2 in its rear part there is a cone 4 mating with the cone of the barrel 5, and on the front the parts have grooves 6 for a knife for opening boxes with cartridges (a hole for a ramrod or a turnkey polyhedron can be made). On the housing 1, protrusions 7 are made for attaching the hub to the machine gun and recesses 8 for fixing the hub body with the clamp 9 of the machine gun. In the additional sleeve 2, a hole 10 is made of a smaller diameter in comparison with the diameter of the channel 11 of the barrel 14. On the block of the front sight 12, there is a dry connection with the protrusions 13 with which the protrusions 7 of the housing 1 are in contact. The ejector casing 15 is pressed onto the barrel 14, on which it is pressed mounted fly block 12.

 Sleeve blank firing works as follows.

 For idle shooting, the sleeve is mounted on a machine gun, for which case 1 is mounted on the tabs of the front sight pads 12 and fixed by the latch 9. The additional sleeve 2 is pressed by a key or other device with a cone 4 to the cone 5 of the barrel with an interference fit. Moreover, if there is a misalignment between the cone of the sleeve and the cone of the barrel, then due to the gaps in the threaded and bayonet connections of the cone of the sleeve and the arrester are installed in the required position. This circumstance provides a reliable obturation of this compound. When fired by a blank cartridge, the front front of the powder gases approaches the smaller hole 10 of the additional sleeve 2, where the pressure of the powder gases and the time of their expiration from the barrel of the weapon increase, which ensures the normal operation of the weapon automation.

 The use of a movable connection between the body and the auxiliary sleeve eliminated the leakage of gases between the flame arrester and the additional sleeve, which eliminated the clogging of the ejection channels and the attachment points of the sleeve to the machine gun with powder gas. In addition, the casing and the additional sleeve have decent dimensions that allow you to visually perceive the presence on the machine gun sleeve for idle shooting.

 Extensive experimental research and testing of the proposed solution showed the normal operation of the sleeve for idle firing.

Claims (1)

 A sleeve for single shooting from small arms, comprising a housing with a mounting point to the weapon and an additional sleeve with a central hole, characterized in that the additional sleeve is configured to self-adjust its position relative to the housing, and a cone is made on its outer surface from the side of the mounting point to the weapon mating with the conical surface of the barrel or flame arrester, while the housing and the additional sleeve form a self-aligning system relative to the cone of the barrel or flame arrester body.

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