RU2243470C2 - Gas-exhaust mechanism of self-loading weapon - Google Patents

Abstract

FIELD: armament.

SUBSTANCE: the front end face of the gas pipe of the gas-exhaust mechanism of the self-loading open is located in the working cylinder of the gas chamber and restricts the backward motion of the piston. Besides, an annular flange is made on the piston for engagement with the slot made on the rod.

EFFECT: simplified construction and facilitated servicing of the gas-exhaust mechanism.

2 cl, 3 dwg

Description

The invention relates to the design of the vent mechanisms of self-loading firearms.

Known gas bleeding mechanism of the AKM Kalashnikov assault rifle (see “Manuals on small arms”, - M .: Military publishing house, 1973, p.148-157), containing a gas chamber with a working cylinder for the piston, a rod with a piston, made in one piece, and a gas tube inside which reciprocating rod and piston movements are performed. The stem is connected to the slide frame. The gas pipe covers the outer cylindrical flange of the gas chamber.

The principle of operation of the gas exhaust mechanism consists in the fact that the powder gases during the shot from the barrel through the gas outlet enter the working cylinder of the gas chamber, act on the piston with the rod and set the slide frame with the shutter in motion. In this case, the piston moves inside the gas tube.

The disadvantage of this venting mechanism is the insufficient power of the gas engine to ensure reliable operation of the weapon automatics when using cartridges that create low pressure of the powder gases in the bore, since the force with which the powder gases act on the piston is determined by the product of the pressure of the powder gases by the cross-sectional area piston. Increasing the diameter of the piston leads to an unacceptable increase in the overall dimensions of the weapon.

Closest to the proposed invention is a gas evacuation mechanism of self-loading weapons (see certificate No. 2639, 01/17/1995, for the utility model "Gas evacuation mechanism of self-loading weapons") containing a gas chamber with a working cylinder, a piston, a gas tube and a rod.

The piston is not connected to the stem and is eccentric to the stem. At the same time, it became possible to increase the diameter of the working cylinder of the gas chamber and the piston, and with it the pressure force of the powder gases on the front wall of the piston, without significantly increasing the dimensions of the weapon.

The backward movement of the piston is limited by the rear wall of the gas chamber, and forward by a plug installed on the thread. The front end gas pipe is worn on the cylindrical flange of the gas chamber.

The disadvantages of the prototype are: increased leakage of powder gas into the gaps of the threaded connection of the plug with the gas chamber; difficulty in disconnecting the plug due to the accumulation and hardening of powder deposits in the threaded connection; complication of disassembly due to the need to use a special tool to disconnect the plugs in dirty conditions.

The objective of the proposed invention is to simplify the design and facilitate maintenance of the vent mechanism, provided that the arms are kept to a minimum size and the automation reliability is required when using cartridges that create low pressure of powder gases in the barrel bore.

To solve this problem, the gas exhaust mechanism of self-loading weapons contains a gas chamber with a working cylinder, a piston, a gas tube, a rod.

New in the proposed invention is that the front end of the gas tube is placed in the working cylinder of the gas chamber and restricts the movement of the piston back.

An annular protrusion is made on the piston with the possibility of interaction with a groove made on the rod.

The essence of the invention is illustrated by drawings, which depict:

figure 1 - vent mechanism at the time of the piston in its extreme forward position;

figure 2 - vent mechanism at the time the piston is in its extreme rear position;

figure 3 - aa in figure 1.

The proposed vent mechanism is structurally made as follows.

On the barrel 1 there is a gas chamber 2 with a working cylinder 3, inside of which there is a piston 4, inside of which an annular protrusion 5 is made. The rod 6, which is part of the shutter frame 7, is mounted with the possibility of movement along the guide projections 8 of the gas tube 9. In the front of the rod 6, a groove 10 is made. The front end 11 of the gas tube 8 is placed in the working cylinder 3 of the gas chamber 2. In the barrel 1 and gas chamber 2 there is a gas outlet 12 for supplying powder gases.

In the initial position, the shutter frame 7 with the rod 6 is in the forward position. The rod 6 holds the piston 4 in the forward position.

After the shot, the powder gases through the gas outlet 12 come from the barrel 1 into the working cylinder 3 of the gas chamber 2 and act on the piston 4. The piston 4 moves under pressure of the powder gases together with the rod 6 and the shutter frame 7. After joint movement with the shutter frame 6, the piston 4 stops when it encounters the front end 11 of the gas tube 9 in the path of movement.

The bolt frame 7 continues to move all the way back, and then comes back forward, carrying out a cycle of reloading weapons. When the bolt frame 7 moves forward, the stem 6 acts on the piston 4 and returns it to its original position. The gas vent mechanism assumes its original position.

When disassembling the piston 4 is removed back from the working cylinder of the gas chamber 2 after removing the gas tube 9.

If it is difficult to remove the piston 4 from the working cylinder of the gas chamber 2, the shutter frame 7 with the rod 6 with the disconnected gas pipe 9 are mounted on the weapon. The rod 6 is inserted into the internal cavity of the piston 4 and is skewed down so that the groove of the rod 6 slides over the annular protrusion 5 of the piston 4. In this case, the rod 6 is rigidly connected to the piston 4. When the bolt frame 7 is pulled back with the rod 6, the piston 4 will removed from the gas chamber 2.

Thus, the proposed venting mechanism allows to simplify the design and maintenance of the venting mechanism, while ensuring reliable operation of the automatics when using cartridges that create a low pressure of powder gases in the barrel bore without firing, without increasing the dimensions of the weapon.

Claims (2)

1. The vent mechanism of a self-loading weapon, containing a gas chamber with a working cylinder, a piston, a gas tube, a rod, characterized in that the front end of the gas tube is placed in the working cylinder of the gas chamber and limits the movement of the piston back. 2. The gas vent mechanism according to claim 1, characterized in that the piston is made annular protrusion with the possibility of interaction with a groove made on the rod.

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