JPH0363500A - Bolt closing device for machine gun - Google Patents

Abstract

PURPOSE:To provide a complete closing of a bolt and improve a safety of a shooting person by a method wherein a barrel of a machine gun utilizing gas pressure and a cartridge compartment are separated and the barrel is made freely movable in a longitudinal direction. CONSTITUTION:An idle bottom 6 is manually moved toward a rearward direction, and the bolt 6 is returned to its seat under a force of a countercoil spring 10 while the first cartridge 8 is being fed to a cartridge compartment 3. The barrel 1 is moved forwardly in a longitudinal direction under a thrusting force of a bullet 9 projected from the first cartridge 8 ignited and exploded with a trigger 11 and a combustion pressure of the cartridge, a holder pin 4 is depressed while the barrel tapered part moved simultaneously is being slid and then the holder 2 is lifted up, resulting in that at the same time the lifted holder engaging part 2b is engaged with the bolt engaging part 6a. During the time in which a bullet head 9 is advancing within the barrel 1, a retracting movement of the bolt part 6 is prevented and then its complete closed state is continued.

Description

[Detailed Description of the Invention] Field of Industrial Application) The present application relates to the bottom closure of a gas pressure actuated mechanism in an automatic gun, and to prevent the risk of ejecting high-pressure propellant gas backward (toward the shooter) when firing a warhead. The purpose is to prevent the gas pressure operating mechanism from operating under proper operating conditions at all times.

(Prior Art) As shown in FIG. 5, in an automatic gun, the first cartridge 105 must be manually loaded into the chamber 103 in preparation for firing the warhead 104, so the bolt 106 can be manually operated at all times. It looks like this.

Bullet! Immediately after the 1Ji 104 is fired, in order to eject the spent cartridge 105 and prepare the second cartridge 110 for firing, the bolt 106 is moved in the direction of the shooter (C in the direction of the arrow in Figure 5).
It is designed to use the combustion pressure of gunpowder to move backwards.

Originally, the combustion pressure of gunpowder is generated within the cartridge 105, and ideally it is all effectively used to propel the warhead 104. However, at the same time, the process of ejecting the spent cartridge from the gun body is an advantage of automatic guns. The force that tries to act immediately acts in the direction of the arrow in Figure 5.

Therefore, considerably strong combustion pressure of gunpowder is discharged from the cartridge outlet (not shown) in the direction of the shooter (in the direction of arrow ε in FIG. 5).

All automatic firearms, including rifles and shotguns, are designed to delay the ejection process of spent cartridges in order to protect the shooter from danger due to the expulsion of gunpowder combustion pressure.

In order to protect the shooter from the above-mentioned dangers in the conventional FF171 gun, one way to delay the above-mentioned stroke is to increase the inertial weight of the bolt 106 and strengthen the re-seating spring 10B, thereby preventing the bolt 106 from closing prematurely. It was suppressed from

Straight propagation guns (an example is shown in Figure 5), which is a type of conventional automatic gun, do not have a closure device for the bolt 106, so in order to protect the shooter from the above danger, the combustion pressure of the gunpowder is reduced. This is not possible unless you use a cartridge with a low temperature.

If a cartridge with high gunpowder combustion pressure is to be used, the barrel retaining part (201a in Figures 6 and 7) and the bolt engaging part 206a should be combined to create a strong resting spring 208 and increase the inertial weight. The delayed valve has a closing device that suppresses premature opening of the bolt 206 and delays the combustion pressure of the large system for ejecting the spent cartridge 205 until it drops to a safe state.・There is a blow pack method.

The above-mentioned Niga method exists as a conventional well-known technique.

An example of the operation of the straight blowpack method will be explained using FIG. 5. The first cartridge 105, which is ignited and exploded by the firing pin 109, propels the warhead 104 by the combustion pressure of the gunpowder.
At the same time, a force acts to cause the bolt 106 to rearward (in the direction of the arrow in Fig. 5) to the rear (the inertial weight of the bolt 106 and the force of the restoring spring 108 cause the bolt 106 to be delayed in rearing for a while, but the gunpowder Unable to resist the combustion pressure, the used cartridge 105 moves to a stroke for ejection, and the bolt 106 returns to its seat while loading the second cartridge 110 into the storage chamber 102 due to the sight spring 108 being energized at the same time.

Next, an example of the operation of the delayed blow pack method is shown in the sixth section.
To explain with reference to FIG. 7, the barrel engaging portion 201a and the bolt engaging portion 206a are combined, the bolt 206 is fixed in a fixed position by the restoring spring 208, and the rear of the chamber 202 is closed.

The first cartridge 2 loaded in the closed storage chamber 202
05 is exploded by the firing pin 209 and the propulsion of the warhead 204 begins, the bolt 206 cannot be immediately opened, but the bolt 206 can no longer resist the combustion pressure of the gunpowder, but the bolt 206 begins to retreat.

Simultaneously with the retreat of the bolt 206, the barrel 201 retreats, and at the same time the accumulating chamber 202 retreats while making contact with the rust barrel bottle 203, the barrel lowering groove 202a engages with the barrel pin 203, and the barrel
01 descends.

The lowered gun barrel 201 releases the connection between the barrel engaging portion 201a and the bolt engaging portion 206a.

The released bolt 206 is pushed back to the position for ejecting the used cartridge, and the resting spring 20 is energized at the same time.
8, the second cartridge 210 is loaded into the storage chamber 202 and returned to its seat in order to be ready for firing.

(Problems to be Solved by the Invention) The conditions desired for the above-mentioned prior art automatic guns and all automatic guns are: 11) The shooter's safety is ensured and the operation is reliable at all times, regardless of whether it is a weakly loaded bullet or a heavily loaded bullet.

r2) The mass of moving parts should be as small as possible to ensure ease of operation.

(3) Responsiveness must be quick and reliable.

From the above point of view, if we examine the desired conditions mentioned above.

First, the conventional straight blowpack system has a closure device for the bolt 106, so when a heavily loaded bullet is used, the strong combustion pressure of the gunpowder is quickly directed toward the shooter.
Direction of discharge) A danger to the shooter exists.

The second condition is that the bottom is 10 to prevent early opening.
6 must have a certain amount of mass to strengthen the restoring spring 108, which does not satisfy the desired conditions.

Even if the bullets are the same, their strength may be slightly different and the third desired condition may not be satisfied.

Next, we will consider the delayed propack method.

The first desired condition is safety, but the bottom 206
Since it has a closing device C (FIGS. 6 and 7 F), it is possible to prevent the bolt 206 from opening early even with a somewhat heavily loaded bullet, but it does not ensure reliable closure of the bolt as in the present application.

The second desired condition is the mass of the movable part, but in order to satisfy the first desired condition, the mass tends to be large and the restoring spring must also be strong, which tends to result in poor operability.

Although the third desired condition can be satisfied to some extent with current machine tools and technology, it cannot be expected to be as reliable as in the present application.

As mentioned above, the conventional device has to consider and design and manufacture guns for weakly loaded bullets and heavily loaded bullets, and there is also the problem that all of the above mold conditions cannot be satisfied. Ta.

In order to solve the above-mentioned problems of the conventional device, the present invention separates the barrel 1 and the chamber 3 from the conventional gun barrel and the chamber 3, which were the same part. The gun barrel 1 is moved forward in the longitudinal direction (
The barrel taper portion 1a moves the barrel pin 4 in the direction shown in FIG. , the force that tries to push the bolt 6 backward is blocked.

C Embodiment) Next, the present application will be explained in detail with reference to drawings showing embodiments.

In FIG. 1, the rear part of the gun barrel 1 has a tapered barrel taper part 1a, and a tapered holder taper part 2a, which is connected to the firing pressure of the gunpowder and the bullet! The gun barrel 1 moves forward (in the direction shown in Fig. 2B) and engages with the propulsive force of j19.

FIG. 2 shows the firing preparation completed, but the bolt 6 is not yet closed, so the bolt 6 can be freely operated.

The holder pin 4 is fixed to the frame 7 and is moved and pressed by the barrel taper portion 1a which advances simultaneously with the firing of the warhead.

Since the holder pin hole 2C is made of fillet, the holder 2 rises while coming into contact with the holder pin 4 whose sliding movement is suppressed.

FIG. 3 shows a state in which the raised retaining portion 2b of the holder 2 and the M-bottom retaining portion 6a are engaged to prevent the bolt 6 from opening prematurely.

With the above configuration, the bolt 6 is prevented from opening immediately after the firing of the warhead 9 and the combustion pressure of the high-pressure gunpowder is generated, thereby ensuring the safety of the shooter.

When using the present invention, manually move the bolt 6 backward (in the direction of arrow A in FIG. I returned to the seat while sending it to the storage room 3 for loading.

FIG. 2 shows the state in which the idle I56 is seated and ready for launch.

The gun barrel 1 moves forward in the longitudinal direction (in the direction of arrow B in Figure 3) due to the propulsive force of the warhead 9 fired from the first cartridge 8 which has been point-exploded by the firing pin 11 and the combustion pressure of the gunpowder.
The barrel taper part 1a that moved at the same time presses the holder pin 4 while moving, raising the holder 2. At the same time, the raised holder engaging part 2b engages with the bottom engaging part 6a, and the bullet 9 moves into the barrel 1. While being propelled inside, the bolt 6 is prevented from retreating and the fully closed state is maintained.

"Effects of the Invention" Since the present application has the above configuration, there is no part to be adjusted in particular, and the bolt 6 is completely closed 11 regardless of the strength of the cartridge.
As a result, the restoring spring 10 can be weakened, the use of physical strength can be reduced during firing operation, and the combustion pressure of gunpowder can be effectively used while the warhead 9 is being propelled through the gun barrel. After the bullet 9 is transferred from the gun barrel 1 and the combustion pressure of the gunpowder decreases, the bolt 6 is opened, which has the effect of increasing the safety of the shooter.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing an embodiment of the present application, where Figure 1 is a cross-sectional perspective view of the main part, Figure 2 is a cross-sectional view of the ready-to-launch state, and Figure 3 is a cross-sectional view of the warhead in a state where it is fired. Figure 4 is an exploded perspective view of the main parts, Figure 5 (Figures 221 to 7 are explanations of conventional examples,
Figure 5 is a cross-sectional view of the straight blowback method, Figure 6
The figure is a cross-sectional view of one type of delayed blowpack.
The figure is a sectional view of the delayed blowback system in an unclosed state. The correspondence between the main parts and symbols in Figures 1 to 4 is as follows: 1... Gun* 1a',... Barrel taper part 2...
・Holder 2a...Holder taper n 2
b...Holder attachment part 3...Cumulative chamber 4...
・Holder pin 5... Assembly screw 6... Bolt 6a... Bolt engaging part 7... Frame 8
...First cartridge 9...Warhead 10...
- Restoration spring 11... Firing pin 12... Second cartridge The correspondence of the main parts and symbols in Fig. 5 is as follows: 101.
... Barrel 102 ... Barrel pin 103 ... Cumulative chamber
104... Warhead 105... First cartridge
106...Yu JM 107...Frame
108... Reseating spring 109... Firing pin
110... The correspondence between the main parts and the symbols in FIGS. 6 and 7 of the second cartridge is as follows: 201... Gun barrel 201a... Gun barrel engaging part 2
02...Common chamber 202a...Barrel lowering groove 2
03... Barrel pin 204... Warhead 205.
...First cartridge 206...Role 206a.
... Bolt engaging part 207 ... Frame 208a
Seat spring 209... Firing pin 210... Second cartridge

Claims (1)

[Scope of Claims] 1. In an automatic gun that uses gas pressure to rearward the bolt by using the combustion pressure of gunpowder and restore the rearward bolt by a restoring spring, the gun barrel and the accumulating chamber are separated, and the gun barrel is A bolt closure device for an automatic gun, characterized in that the bolt is movable back and forth in the longitudinal direction. 2. The rear end of the barrel is tapered so that when the gun barrel moves forward in the longitudinal direction due to the propulsive force of the firing gas and the warhead, the tapered part of the barrel slides and presses the holder pin, causing the barrel holder to rise. A bolt closure device for an automatic gun according to claim 1.