RU2438088C1 - Automatic small arms - Google Patents

Abstract

FIELD: weapons and ammunition. ^ SUBSTANCE: automatic small arms include casing with barrel fixed in it, free bolt, return mechanism and housing. Free bolt is installed on guides with possibility of axial back-and-forth movement. Housing includes fore-end, pistol grip, back-plate and trigger firing mechanism. Back-plate is made in the form of a solid part from cast plastic material. Stop is installed in the housing at the contact point with the trigger during firing. Stop is made from elastic material. Stop surface area which is in contact with the trigger is at least 50% of the trigger surface area, and spot of contact of stop with trigger is maximum offset from trigger rotation axis. ^ EFFECT: increasing arms service life. ^ 3 cl, 3 dwg

Description

The invention relates to weapons technology and can be used in various designs of automatic small arms.

Known automatic small arms, containing a casing with a barrel fixed in it, a free bolt mounted on the guides of the casing with the possibility of axial movement, a return mechanism installed in the lower part of the housing, trigger mechanism, pistol grip, in the inner cavity of which is located a box magazine, held by a spring-loaded clamp, and a telescopic butt. In it, the functions of a butt pad are performed by the rear wall of the receiver (patent specification US 3651736, F41D 11/02, publ. 28.03.72).

The disadvantage of the design of automatic weapons is a large range of parts and, as a consequence of this, low adaptability.

Known automatic small arms containing a casing with a barrel fixed in it, a free bolt mounted on rails with the possibility of axial movement, a return mechanism, a housing including a forend, a pistol grip and a butt plate made in the form of a single part made of injection-molded plastic, trigger trigger a mechanism mounted in the housing, and a box magazine located in the neck. The shutter is made in it in the form of a L-shaped part, the long side of which is located above the barrel, and the short one is in front of the breech of the barrel (description of patent RU 2202089, IPC 7 F41C 7/00, F41A 3/54, publ. 04/10/2003 - prototype).

The main disadvantage of the design of automatic small arms is the lack of strength of the plastic case at the point of contact with the trigger, which does not provide the required level of operational life of the weapon when using 9 × 19 mm high-power ammunition.

The objective of the invention is to increase the operational resource and reliability of the operation of automatic small arms.

The technical result is achieved by the fact that in an automatic small arms containing a casing with a barrel fixed in it, a free bolt mounted on rails with the possibility of axial reciprocating movement, a return mechanism, a housing including a forend, a pistol grip and a back plate made in the form of a single molded plastic parts, and trigger trigger mechanism installed in the housing:

- an emphasis made of an elastic material is installed in the housing at the point of contact with the trigger when firing;

- - the area of the stop in contact with the trigger is at least 50% of the area of the trigger, and the contact spot of the stop with the trigger is maximally offset from the axis of rotation of the trigger;

- in the emphasis can be made a recess, comprising from 2 to 12% of the volume of the emphasis;

- the recess can be performed outside the contact spot of the stop with the trigger.

The foregoing is illustrated by drawings, where:

- figure 1 shows a left view of an automatic small arms with a partial longitudinal section along the trigger mechanism and butt plate;

- figure 2 shows a cross-section along the stop and trigger;

- figure 3 shows a longitudinal section along the trigger, emphasis and butt plate.

Automatic small arms contains a casing 1 with a barrel fixed in it 2. On the guides of the casing 3 there is a free shutter 4 with the possibility of axial reciprocating movement. A return mechanism 5 is placed inside the casing, interacting with the shutter 4. In the housing 6, made of high-strength injection-molded plastic in the form of a single part, including the forend, pistol grip and butt plate, a trigger mechanism is installed. In the place of contact of the housing 6 with the trigger 7 of the trigger mechanism, an emphasis 8 is made of elastic material.

When firing, the trigger 7 in the rear position hits the stop 8, while a significant part of the trigger energy is extinguished due to the deformation of the stop 8 and additionally due to the elastic properties of the stop material. As a result, the residual energy transmitted by the trigger 7 is significantly lower than the voltage value that can destroy the material of the housing 6, which ensures the high operational stability of the structure. In the stop 8, a recess 9 can be made, providing an additional reduction in impact energy due to the greater deformation of the stop. Structurally, the recess in the emphasis can be made in a wide variety of ways: it can have both longitudinal and transverse directions with respect to the direction of movement of the trigger 7. In the cross section, the recess can have a round, square, rectangular, oval, trapezoidal or any other shape, including combining the various forms above. The recess in the emphasis 8 can be made both in the form of a through hole and a blind groove. The optimal size of the notch, providing the necessary positive effect, is from 2 to 12% of the emphasis volume. The recess can be performed outside the contact spot of the stop with the trigger.

The emphasis 8 can be installed in the housing 6 both freely and with interference. Fixing the stop in the body can be done by any available means: adhesive bonding, mechanical using screws, screws, etc. means, using the stop as a reinforcement when molding under pressure of the body 6 and vice versa, forming the joint by partially melting or tightening the technological tide on the stop 8 etc.

The emphasis can be made of any elastic (rubber-like) material, it is preferable to use thermoplastic polyurethane or polyester thermoplastic elastomer processed by a high-performance injection molding method.

The emphasis area in contact with the trigger 7 is at least 50% of the trigger area. If the area of the stop 8 in contact with the trigger is less than 50% of the area of the trigger, then a positive effect is not achieved, since the amount of quenching of the trigger energy is insufficient. The maximum value of the area of emphasis is limited only by the design features of the housing 6 automatic small arms. The contact spot of the stop with the trigger is maximally offset from the axis of rotation of the trigger.

The technical solution according to the invention is implemented in the sample 9-mm submachine gun, which ensured the integrity of the plastic case and the reliable operation of this design with a resource up to 3 times higher than the specified level.

Claims (3)

1. Automatic small arms containing a casing with a barrel fixed in it, a free bolt mounted on rails with the possibility of axial reciprocating movement, a return mechanism, a housing including a forend, a pistol grip and a butt plate made in the form of a single part made of injection-molded plastic, and trigger trigger mechanism mounted in the housing, characterized in that in the housing at the point of contact with the trigger when firing an emphasis is made made of elastic material, while the area of the emphasis and in contact with the trigger, makes up at least 50% of the trigger area, and the contact spot of the stop with the trigger is maximally offset from the axis of rotation of the trigger. 2. Automatic small arms according to claim 1, characterized in that a recess is made in the emphasis, comprising from 2 to 12% of the emphasis volume. 3. Automatic small arms according to claim 1 or 2, characterized in that the recess is made outside the contact spot of the stop with the trigger.

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