JPH09217998A - Gas-operated automatic firearm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of a situation that an expansion chamber and a piston are rendered inoperable by providing a gas hole means to suck a part of gas generated due to firing of a one full shot to operate a piston means to release the breech of a gun. SOLUTION: A shotgun has at least one gas hole 15 which is arranged in a cylinder part 7 of the barrel of a gun 3 in a position nearmost a conical part 9 and through which the bore of the barrel 3 of a gun is connected to an expansion chamber formed in a cylinder 19 incorporated in the barrel 3 of a gun. The expansion chamber has one end comprised by a piston 21 in which an operation rod 23 is incorporated and slidable within the cylinder 19 and the other end comprised by a closed body 25. A small part of gas generated by firing enters the expansion chamber through the gas hole 15 as a piston 1 is moved to a rear, and the piston 21 pushed by a breech 11 of a gun by a rod 23. When an excessive pressure is generated, the pressure is absorbed by a pressure control valve 31.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to gas fired automatic firearms, and more particularly to shotguns.

[0002]

BACKGROUND OF THE INVENTION Self-loading shotguns generally have a breech mechanism associated with a piston-cylinder assembly that is actuated by a portion of the gas that is produced in one shot and escapes from the barrel to the cylinder. There is. The gas hole is generally located in the midline position of the barrel, forward of the midpoint of the barrel length.

[0003]

There are a few problems associated with self-loading gas operated shotguns. The main problem with self-loading shotguns is that they need to fire bullets of different powers and to ensure proper operation for the weakest bullets. It is large enough to pass the gas of. The diameter of the piston must also be larger than the diameter of the barrel.

Another problem with conventional gas operated shotguns is that the barrel must have a minimum length because the gas holes are in the forward position. However, it is desirable for an autoloading shotgun to have a shorter barrel.

US Pat. No. 4,102,242 discloses a gas actuated shotgun having a pair of gas cylinders on either side of the barrel, somewhat forward of the barrel. The cylinder engages each piston with an inertial weight slidably mounted on the magazine. The inertia weight is connected to the playground mechanism by a pair of actuating rods. The barrel of this shotgun must have a minimum length set by the forward position of the gas cylinder and associated gas holes.

It is an object of the present invention to provide a gas-operated shotgun in which the barrel length is selected as needed and always ensures complete automatic operation.

Within the scope of this object, the present invention provides, among other things, a gas-operated shotgun that provides improved automatic actuation over conventional gas-operated shotguns, even when firing, for example, low power ammunition. It is a thing.

Yet another object of the present invention is to provide a gas-operated shotgun that is less likely to render the expansion chamber and piston inoperable.

[0009]

These and other objects which will become apparent below are: the barrel forming a cylindrical portion which is merged with the barrel chamber closed by the breech; the barrel closest to the barrel chamber. And a gas hole that draws in a portion of the gas generated in one shot to actuate a piston that is arranged to automatically open the breech to reload the firearm. Achieved by a structured gas-operated automatic firearm.

Further features and advantages will be apparent from the description of the preferred but non-exclusive embodiments of the invention, which are illustrated by non-limiting examples of the accompanying drawings.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, reference numeral 1 is generally used.
The gas-operated shotgun indicated by 1 has a barrel 3 in which a medicine packing chamber 5 is connected to a cylindrical portion 7 of the barrel by a conical portion 9. The breech 11 is actuated by a motion system that receives energy from gas arriving from gas holes formed in the barrel in a manner known per se. In this example, a smooth-bore shotgun is disclosed, for example, in Italian Patent No. 1,172,79.
No. 5 and the corresponding EP 0128125 and U.S. Pat. No. 4,604,942 in the name of the same applicant, having a breech 11 with a rotary head 13 of the type described. For brevity, the operation of the substantially known breech 11, which is described in detail in these earlier patents, will not be repeated here. However, it is clear that any other type of breech can be used in the weapon according to the invention.

The shotgun 1 is disposed in the cylindrical portion 7 of the barrel 3 at a position closest to the conical portion 9 and is provided with an expansion chamber 17 formed in a cylinder 19 incorporated in the barrel 3 of the weapon. Has at least one gas hole 15 which is adapted to be connected. The expansion chamber 17 has one end formed by a piston 21 into which an actuation rod 23 acting on the breech 11 is incorporated and which can slide in the cylinder 19, and the other end formed by a closing body 25.

The closing body 25 is constituted by a threaded cylindrical body that engages with a corresponding screw 27 formed on the cylinder 19. The cylindrical body has a protrusion 29 that comes into contact with the end of the piston 21. The closing body 25 further includes a spring 37.
It also has a pressure limiting valve 31 constituted by a hole 33 which is closed by a movable ball 35.

In the illustrated example, the shotgun of the present invention advantageously has two cylinders 19 on opposite sides between the barrel 3 and the magazine 39 as shown in FIG. However, it is also possible to use a single cylinder depending on the particular needs and type of weapon.

The operation of the shotgun of the present invention is as follows.

FIG. 1 shows a small firearm in an idle state in which the gun turret is closed and the barrel 41 and the expansion chamber 17 are emptied to be ready for ignition.

A small part of the gas generated by the firing enters the expansion chamber 17 through the gas hole 15 while moving the piston 21 rearward (to the left when referring to FIGS. 1 and 2), and the piston 21 Pushes the breech 11 with the rod 23 to release it as shown in FIG. If there is excessive pressure,
It is absorbed by the pressure limiting valve 31. FIG. 2 shows the rear turret and the medicine package 41 leaving the barrel 3.
The operation of the breech and the loading system is substantially known and will not be described here. It is also clear that the system of closing the breech, loading and delivering the firearms can be different from the example shown if desired.

The shotgun of the present invention is subject to several modifications and alterations, all falling within the scope of the appended claims, all details being replaced by technically equivalent elements. .

The materials and dimensions to be used may of course be any ones depending on the necessity and the situation of the industry. Where the technical features referred to in any of the claims are followed by the reference signs, the reference signs are included only for the purpose of improving the comprehension of the claims, and Such reference signs do not have any limiting effect on the scope of the elements identified in the examples by means of them.

[0020]

The present invention achieves the intended goals and objectives by providing a shotgun that can be provided with any barrel length as needed, due to the characteristic placement of the gas holes near the drug sac. Was actually observed.

Another advantage of the present invention is that gas is taken in at the highest pressure, while ensuring good operation even for the weakest package.

Another important advantage is that the gas cylinder has a substantially smaller diameter than conventional cylinders. In fact, the diameter of the gas cylinder of the present invention is about half that of the conventional one, which results in less malfunction of the cylinder and piston and also draws less energy from the charge of the package, and the package chamber. Reduce the amount of gas extracted from. This also reduces the unwanted consequences of the firing pattern.

Furthermore, when fired once,
Since the piston diameter has been reduced, the play bottom is initially contrasted with the thrust of the piston. This causes a delay in the opening of the breech bolt, which is in addition to the lag caused by the rotating breechhead head. The operation of small firearms will thus be greatly improved, especially when using a few shots of cardboard ammunition.

[Brief description of drawings]

FIG. 1 is a partial longitudinal cross-sectional side view of a portion of a shotgun according to the present invention shown with the barrel closed and the drug packet within the barrel.

FIG. 2 is a view similar to FIG. 1 in a state in which the breech is moving backward and the medicine package is moving.

FIG. 3 is a partial sectional front view of a shotgun.

FIG. 4 is a developed side view of a shotgun according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shotgun 3 ... Barrel 5 ... Medicine packing chamber 7 ... Cylindrical part 9 ... Cone part 11 ... Gun tail 13 ... Rotating head 15 ... Gas hole 17 ... Expansion chamber 19 ... Cylinder 21 ... Piston 23 ... Operating rod 25 ... Closure body 27 ... Screw 29 ... Protrusion 31 ... Pressure Limiting Valve 33 ... Hole 35 ... Ball 37 ... Spring 39 ... Magazine 41 ... Medicine Bag

Claims (11)

[Claims] 1. A gas-operated automatic firearm consisting of a barrel (3) forming a cylindrical part (7) merged with a medicine-filling chamber (5) which can be closed by a breech (11). Is generated in one shot to actuate a piston means (21) which is located closest to the chamber and is adapted to automatically open the breech to reload the firearm. Gas-operated automatic firearm, characterized in that it has gas-hole means (15) adapted to suck in a part of the gas. 2. The firearm according to claim 1, comprising two gas holes (15) connected to each cylinder (19) arranged on each side of the barrel. 3. A firearm according to claim 2, wherein each piston is directly connected to the breech by a rod (23). 4. The small gas chamber according to claim 1, wherein said gas hole means is connected in a cylinder to an expansion chamber (17) formed by said piston and a closing body (25) incorporated in said cylinder. Firearms. 5. The firearm according to claim 4, comprising a pressure limiting valve (31) for extracting gas from the expansion chamber in case of overpressure. 6. The firearm according to claim 5, wherein the pressure limiting valve is incorporated in the closing body. 7. The firearm according to claim 1, wherein the cylindrical portion of the barrel is mixed with the medicine-filling chamber by a mixing cone portion (9). 8. The firearm according to claim 1, wherein the gas hole means is provided in the cylindrical portion closest to the mixing cone portion. 9. The firearm according to claim 1, wherein the gas hole means is provided in the mixing cone portion. 10. The firearm according to claim 1, wherein the gas hole means is provided in the medicine packing chamber. 11. The firearm according to claim 1, wherein the breech comprises a rotary closure head.