JP3935544B2 - Gas fired automatic firearm - Google Patents

Abstract

Gas-operated automatic weapon, particularly a shotgun (1), including a barrel (3) having a cylindrical portion (7) that is blended with a cartridge chamber (5) which can be closed by a breech (11), wherein it includes a gas take-off (15) that is located proximate to the cartridge chamber (5) and is suitable to draw a fraction of the gases generated by the cartridge (41) to actuate a piston that is suitable to open the breech (5) for automatic reloading of the weapon (1). <IMAGE>

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to gas-operated automatic firearms, and in particular to shotguns.
[0002]
[Prior art]
Self-loading shotguns generally have a bottom mechanism connected to a piston and cylinder assembly that is activated by a portion of the gas generated by a single shot and escaping from the barrel to the cylinder.
The gas hole is generally located in front of the midpoint of the barrel length and at the mid position of the gun cavity.
[0003]
[Problems to be solved by the invention]
There are a few problems associated with self-loading gas-operated shotguns.
The main problem with self-loading shotguns is that they need to ignite bullets of different powers or to ensure correct operation against the weakest bullets, so that the cross section of the gas hole is sufficient. It is quite large so that the gas can pass through. The piston diameter must also be larger than the gun bore diameter.
[0004]
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 would be desirable to have a self-loading shotgun with a shorter barrel.
[0005]
U.S. Pat. No. 4,102,242 discloses a gas-operated shotgun with a pair of gas cylinders mounted on both sides of the barrel at some forward position of the barrel. The cylinder engages each piston with an inertia weight that is slidably mounted on the magazine. The inertia weight is connected to the free bottom mechanism by a pair of operating rods. The barrel of the shotgun must have a minimum length set by the forward position of the gas cylinder and associated gas holes.
[0006]
The object of the present invention is to provide a gas-operated shotgun in which the length of the barrel is selected as required and always ensures complete automatic operation.
[0007]
Within this scope, the present invention provides a gas-operated shotgun that provides improved automatic operation over conventional gas-operated shotguns, particularly, for example, when firing low power ammunition. .
[0008]
Yet another object of the present invention is to provide a gas operated shotgun with less expansion chamber and piston inoperability.
[0009]
[Means for Solving the Problems]
These objectives, and other objectives that will become apparent below, are: barrels that form a cylindrical portion that merges with a medicine chamber that is closed by a breech; By a gas-operated automatic firearm composed of a gas hole for inhaling a portion of the gas generated by a single shot to actuate a piston adapted to open the breech to reload Achieved.
[0010]
Further features and advantages will become apparent from the description of the preferred but not exclusive embodiments of the invention which are only illustrated by way of non-limiting examples in the accompanying drawings.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawing, a gas-operated shotgun generally indicated by reference numeral 1 has a barrel 3 in which a medicine chamber 5 is connected to a cylindrical portion 7 of a barrel by a conical portion 9. The breech 11 is operated by a motion system that receives energy from gas arriving from a gas hole formed in the barrel in a known manner. In this example, a smooth-bore shotgun is described, for example, in Italian Patent No. 1,172,795 and the corresponding European Patent No. 0128125 or US Pat. No. 4,604,942 in the name of this same applicant. It has a breech 11 with a rotary head 13 of the type described. For brevity, the operation of the substantially known breech 11 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 for the weapon according to the invention.
[0012]
The shotgun 1 is disposed in the cylindrical portion 7 of the barrel 3 at a position closest to the conical portion 9 and connects the barrel of the barrel 3 to an expansion chamber 17 formed in a cylinder 19 incorporated in the barrel 3 of the weapon. At least one gas hole 15 is provided.
One end of the expansion chamber 17 is formed by a piston 21 in which an operating rod 23 acting on the breech 11 is incorporated and can slide in the cylinder 19, and the other end is formed by a closing body 25.
[0013]
The closing body 25 is constituted by a threaded cylindrical body that engages with a corresponding screw 27 formed in the cylinder 19. The cylindrical body has a protrusion 29 that contacts the end of the piston 21. The closure 25 also has a pressure limiting valve 31 which is constituted by a hole 33 which is closed by a ball 35 which can move in contrast to the spring 37.
[0014]
In the illustrated example, the shotgun of the present invention advantageously has two cylinders 19 on either side between the barrel 3 and the magazine 39 as shown in FIG. However, it is also possible to use a single cylinder according to specific needs and weapon types.
[0015]
The operation of the shotgun of the present invention is as follows.
[0016]
In FIG. 1, a small firearm in an idle state is shown in which the breech is closed, the medicine pack 41 is emptied in the barrel, and the expansion chamber 17 is emptied and ready for firing.
[0017]
A small portion of the gas generated by the firing moves into the expansion chamber 17 through the gas hole 15 while moving the piston 21 backward (to the left when referring to FIG. 1 and FIG. 2). 2, the breech 11 is pushed by the rod 23 so as to be opened as shown. If excessive pressure occurs, it is absorbed by the pressure limiting valve 31. FIG. 2 shows a breech that moves backward and a medicine package 41 that leaves the barrel 3. The operation of the breech and loading system is substantially known and will not be described here. It is also clear that the system for closing the breech, loading and delivering the firearms can be different from the illustrated example if necessary.
[0018]
The shotgun of the present invention may be subject to several modifications and alterations that all fall within the scope of the appended claims, and all details may be replaced with technically equivalent elements.
[0019]
Of course, any materials and dimensions may be used depending on the needs and conditions of the industry.
Where technical features directed to any claim are followed by reference signs, the reference signs are included for the sole purpose of enhancing the understanding of the claims and therefore Such reference signs do not have any limiting effect on the technical scope of each element identified in the examples by those signs.
[0020]
【The invention's effect】
It is actually observed that the present invention achieves its intended goals and objectives by providing a shotgun that can have any barrel length as needed, thanks to the characteristic arrangement of gas holes near the chamber. It was done.
[0021]
Another advantage of the present invention is that the gas is taken in when the pressure is highest while ensuring excellent operation, even for the weakest pack.
[0022]
Another important effect is that the gas cylinder is substantially smaller in diameter than conventional cylinders. In fact, the diameter of the gas cylinder of the present invention is about half that of the conventional one, thereby reducing the malfunction of the cylinder and piston and drawing less energy from the charge of the medicine pack, The amount of gas taken out from the gas is reduced. This also reduces undesirable results with the firing pattern.
[0023]
In addition, when fired once, the shotgun reciprocity reduced the piston diameter so that it was initially compared to the piston thrust. This causes a delay in the opening of the bottom, which is added to the delay caused by the rotating bottom head. Firearm operation will thus be greatly improved, especially when using several ammunition of cardboard bullets.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal cross-sectional side view of a portion of a shotgun according to the present invention illustrated with the barrel closed and a medicine package in the barrel.
FIG. 2 is a view similar to FIG. 1 in a state in which the breech is moved backward and the medicine package is moving.
FIG. 3 is a partial cross-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 bag chamber 7 ... Cylindrical part 9 ... Conical part 11 ... Gun tail 13 ... Rotary head 15 ... Gas hole 17 ... Expansion chamber 19 ... Cylinder 21 ... Piston 23 ... Actuation rod 25 ... Closure 27 ... Screw 29 ... Protrusion 31 ... Pressure limiting valve 33 ... Hole 35 ... Ball 37 ... Spring 39 ... Magazine 41 ... Medicine bag

Claims (3)

A barrel (3) having a medicine chamber (5) and a cylindrical portion (7) connected to each other by a mixing cone (9), and connected to the barrel (3) to close the medicine chamber (5) A floating bottom (11), one or more cylinders (19) connected to the barrel (3) and extending substantially parallel to the barrel, and disposed at least partially within each cylinder, One or more pistons (21) operably connected to said free bottom (11) by means of a rod (23), in order to open the free bottom (11) and automatically reload the shotgun ; Gas actuated automatic slide shot comprising: a cylinder (25) and a closure (25) attached to each cylinder, each cylinder integral with the piston (21) defining an expansion chamber (17) A gun ,
The shotgun, in order to actuate the piston, in order to flow out a part of gas generated during the medicine package chamber (5) within the firing of one shot worth, extending until said expansion chamber (17) Having gas hole means (15) defining gas holes (15),
The gas hole (15) is disposed along the cylindrical portion (7) and close to the medicine chamber (5) at a distance equal to or shorter than the length of the mixing cone portion (9) from the mixing cone portion (9). A shotgun characterized in that it has an air inlet portion and a pressure limiting valve (31) is attached to the closing body (25). 2. A shotgun as claimed in claim 1, characterized in that the free bottom (11) comprises a rotary closure head (13). The shotgun is connected to the barrel (3) on the opposite side of the barrel and extends substantially parallel to the barrel, and at least a portion of each of the cylinders (19). Two pistons (operably connected to the bottom (11) by respective rods (23) in order to open the bottom (11) and automatically reload the shotgun 21) and each cylinder integral with each piston (21) with each closure (25) defines said expansion chamber (17), each one of each said cylinder In order to discharge a part of the gas generated at the time of one shot in the medicine bag chamber (5) in order to operate the piston and the two obstruction bodies (25) attached to Each extending to its respective expansion chamber (17) Shotgun according to claim 1, wherein the said gas hole means defining two gas holes are (15) (15), in that it consists of.

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