JP2023059327A - Air gun and manufacturing method of inner barrel thereof - Google Patents

Abstract

To provide a new air gun and a manufacturing method of an inner barrel thereof capable of exhibiting excellent hit accuracy and extending a flying distance of a spherical bullet.SOLUTION: An air gun 100 comprises an inner barrel 10 which allows a spherical bullet BB to pass through and to be fired from its tip, and a part or the whole of the inner barrel 10 is in a cross section substantially regular triangle. Thus, a high-speed backspin state of the spherical bullet BB passing through the inner barrel 10 can be maintained, then its flying distance can be extended while preventing reduction of rotation frequency. In addition, hit accuracy is improved as the spherical bullet BB can be fired while being positioned at an axis part of the inner barrel.SELECTED DRAWING: Figure 3

Description

The present invention relates to an air gun that shoots spherical bullets such as BB bullets using gas pressure, and a method for manufacturing an inner barrel thereof.

In general, air guns that use plastic spherical bullets such as BB bullets not only fire the spherical bullets by simply using gas pressure, but also increase the flight distance by imparting rotational motion to the spherical bullets at the time of firing. It has been devised to extend it and improve its accuracy. For example, in Patent Document 1 below, when a spherical bullet is fired, the spherical bullet is rotated in a direction centered on the traveling direction to impart a gyroscopic effect to the flying spherical bullet, thereby changing the trajectory during flight. Ideas for stabilizing and increasing accuracy are disclosed.

Further, in Patent Document 2 below, when a spherical bullet is fired, the upper part of the spherical bullet is brought into contact with a rubber protrusion or roller packing to impart an upward rotational motion (backspin) to the spherical bullet. The idea of extending the flight distance by generating lift is disclosed. In addition, in Patent Document 3 below, a rubber projection is further provided near the muzzle inside the barrel, and the upper part of the spherical bullet is brought into contact with the two rubber projections in order to maintain the backspin state and increase the flight distance. Ideas for avoiding degradation are disclosed.

JP-A-2000-213892 Japanese Patent No. 3853782 Japanese Patent No. 3944863

By the way, in order to rotate the spherical bullet in the direction about the traveling direction as shown in the above-mentioned Patent Document 1 and give the flying spherical bullet a gyroscopic effect, a motor, gears, a battery, and the like for rotating the barrel are required. Since a connector or the like is required, the cost increases and the weight of the entire air gun increases. Also, when it stalls, the drop trajectory becomes irregular, reducing accuracy. Furthermore, in the methods disclosed in Patent Documents 2 and 3, when the spherical bullet is fired, it repeatedly contacts the rubber protrusions and the inner surface of the barrel inside the barrel, causing the bullet to slow down, resulting in a reduced flight distance and reduced accuracy. There is a risk.

Accordingly, the present invention has been devised to solve these problems, and its object is to provide a novel ball bullet capable of exhibiting excellent hitting accuracy and extending the flight distance of spherical bullets without increasing cost. A method of manufacturing an air gun and its inner barrel is provided.

In order to solve the above-mentioned problems, a first invention is an air gun having an inner barrel through which a spherical bullet is passed and fired from the tip thereof, wherein part or all of the inner barrel has a substantially equilateral triangular cross section. It is an air gun characterized by With such a configuration, the high-speed backspin state of the spherical bullet passing through the inner barrel can be maintained, so that the flight distance can be extended while preventing the number of revolutions from dropping. In addition, since the spherical bullet can be fired while being positioned at the axial center of the inner barrel, the accuracy of hitting is improved. Furthermore, since these effects can be obtained simply by processing the inner barrel, the increase in cost can be suppressed.

A second invention is an air gun provided with an inner barrel through which a spherical bullet is passed and fired from the tip thereof, characterized in that the vicinity of the tip of the inner barrel has a substantially equilateral triangular cross section. According to such a configuration, the effects of the first invention can be obtained more reliably.

A third aspect of the present invention is an air gun characterized in that the vicinity of the tip of the inner barrel has a downward cross-sectional shape of a substantially triangular shape with one corner facing the direction of gravity. With such a configuration, in addition to the effects of the first and second inventions, high-speed backspin can be imparted, so that the flight distance of the spherical bullet can be further increased.

A fourth aspect of the invention is the method for manufacturing an inner barrel for an air gun according to any one of the first to third aspects, wherein a mandrel having a diameter equal to or smaller than that of the spherical bullet is inserted into the metal pipe having a perfectly circular cross section. and pressing the portion into which the mandrel is inserted into a generally equilateral triangular cross section by pressing it in the axial direction with three mold parts positioned around the portion. A barrel manufacturing method. According to such a manufacturing method, an inner barrel having a substantially equilateral triangular cross section can be easily manufactured.

According to the present invention, since the high-speed backspin state of the spherical bullet passing through the inner barrel can be maintained, it is possible to extend the flight distance while preventing a decrease in the number of revolutions. In addition, since the spherical bullet can be fired while being positioned at the axial center of the inner barrel, the accuracy of hitting is improved. Furthermore, since these effects can be obtained simply by processing the inner barrel, it exhibits excellent effects such as suppressing cost increases.

1 is a configuration diagram showing an embodiment of an air gun 100 according to the present invention; FIG. 3 is a cross-sectional view showing an inner barrel 10; FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG. 2; FIG. 3 is an enlarged cross-sectional view taken along the line BB in FIG. 2; FIG. FIG. 4 is an explanatory diagram showing movement of a spherical bullet BB passing through the inner barrel 10; 6 is an enlarged view showing part A in FIG. 5. FIG. FIG. 4 is an explanatory diagram showing a method of manufacturing the inner barrel 10;

Embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of an air gun 100 according to the invention. Reference numeral 10 in the figure denotes an inner barrel (inner barrel) 10 through which the spherical bullet BB passes, and an air cylinder 30 is connected to one end thereof via a chamber 13 . This inner barrel 10 is covered with an outer barrel (external barrel) 20, and this outer barrel 20 is integrated with a gun body 90 in which an air cylinder 30 and the like are accommodated.

A piston 50 operated by a spring 40 is housed in the air cylinder 30 so as to be able to reciprocate. Further, the gun body 90 is provided with a magazine (not shown) for containing spherical bullets BB, and the spherical bullets BB are sequentially supplied into the chamber 13 through the supply passage 80. .

Here, as a method for operating the piston 50 in the air cylinder 30, it is possible to use a conventionally known air cocking (manual type) or an electric type, and in the present embodiment, the method is particularly limited. not a thing Similarly, the form of the gun body 90 is not particularly limited, and may be a revolver type, a rifle type, a handgun type, a machine gun type, etc., as in the conventional art. Further, a system using vaporized gas instead of the air cylinder 30 may be used.

The inner barrel 10 is made of a metal tube such as brass, aluminum, and stainless steel, and its size is, for example, 200 to 210 mm in length and an inner diameter of 5.95 mm, which is enough for a spherical bullet BB to pass through. The size is about 6.01 to 6.10 mm, for example. As shown in FIG. 2, a part of the inner barrel 10, for example, the vicinity of the tip P at about 20 to 40 mm from the muzzle 11, has a substantially equilateral triangular cross section as shown in FIG.

That is, as shown in FIG. 4, almost the entire inner barrel 10 has a perfect circular cross section so that the spherical bullet BB can pass through, but only the three corners near the tip P are gently curved. The cross section is approximately equilateral triangle (triangular rice ball type). As shown in FIG. 3, the diameter d of the circle inscribed in the three inner surfaces P1, P2, and P3 in the vicinity of the tip P is slightly larger than the diameter of the spherical bullet BB. It is about 6.05 mm.

Further, the vicinity P of the tip of the inner barrel 10 is, as shown in FIG. Therefore, the spherical bullet BB that reaches the vicinity of the tip P, as shown in FIG. It is designed to pass through this while

Next, the operation of the air gun 100 according to the present invention having the inner barrel 10 constructed as described above will be described. As shown in FIG. 1, a spherical bullet BB supplied into the chamber 13 passes vigorously through the inner barrel 10 by the gas pressure supplied to the nozzle 31 from the air cylinder 30 operated by operating the trigger 60, and the muzzle 11 of the barrel 11 fired from. At this time, since the upper projection 12 made of rubber is provided on the upper part of the firing end of the inner barrel 10, the upper part of the spherical bullet BB comes into contact with the upper projection 12 and rotates upward (backspin). ) while passing through the inner barrel 10.

When the spherical bullet BB passes through the inner barrel 10, if the spherical bullet BB comes into contact with the upper surface of the inner barrel 10 as indicated by S1 in FIG. 5, the upward rotation is maintained. On the other hand, if the lower surface of the inner barrel 10 is contacted as indicated by symbol S2, a force in the direction opposite to the upward rotation acts on the spherical bullet BB. As a result, the upward rotation speed decreases.

However, in the inner barrel 10 according to the present invention, as described above, the vicinity of the tip P has a substantially triangular cross-section facing downward. Since there is no contact with the lower surface, no force acts in the direction opposite to the upward rotation, and a high-speed backspin state can be maintained.

That is, if the spherical bullet BB contacts only the upper surface P1 of the substantially triangular downward cross section when passing through the vicinity of the tip P, the upward rotation is maintained or the number of rotations is accelerated in the same manner as S1 in FIG. acts like On the other hand, even if the spherical bullet BB comes into contact with both side surfaces P2 and P3 of the downward cross-section substantially triangular slanted downward while passing through the vicinity of the tip P, the contact site will be near the rotation axis of the spherical bullet BB. Therefore, a large reaction force such as that in the case of symbol S2 in FIG.

Furthermore, as shown in FIG. 6, when passing through the vicinity of the tip P, a large gap C is created in the lower part of the spherical bullet BB. power can be given. As a result, the spherical bullet BB is fired while maintaining a high-speed backspin state, so that the flight distance can be further extended while preventing the rotation speed from dropping.

In addition, since the spherical bullet BB is naturally positioned at the axial center of the inner barrel 10 when passing through the vicinity of the tip P of the downward cross-section of the approximately triangular shape, the inner surface of the inner barrel 10 after that, as shown in FIG. Since the shot is fired straight from the muzzle 11 without contacting the , the falling trajectory is stabilized at the time of stall and the accuracy of hitting is greatly improved.

In this way, not only a part of the inner barrel 10 but also the entire inner barrel 10 may be processed to have a substantially triangular cross section. and the chamber 13 can be utilized as they are without newly manufacturing or processing them. That is, since it is sufficient to replace only the inner barrel 10 from the existing air gun, these effects can be obtained at low cost.

In addition, as a method of processing a portion of the inner barrel 10 to have a substantially triangular cross section in this way, for example, as shown in FIG. , is arranged around a portion of the metal tube 10a having a perfectly circular cross section to be the inner barrel 10 so as to surround it. Then, by inserting a metal mandrel R into the portion to be machined and pressing the mold parts K, K, K from three directions in the axial direction, only that portion can be easily formed into a substantially triangular cross section. can be processed into It is desirable that the diameter of the mandrel R is equal to or less than the diameter of the spherical bullet BB, for example, about 6.0 to 5.5 mm, in consideration of the return of the material after press working.

DESCRIPTION OF SYMBOLS 10... Inner barrel 10a... Metal pipe 11... Muzzle 12... Upper protrusion 13... Chamber 20... Outer barrel 30... Air cylinder 31... Nozzle 40... Spring 50... Piston 60... Trigger 70... Sear 80... Supply passage 90... Gun body 100...Air gun BB...Spherical bullet C...Gap K...Mold part P...Near tip R...Mandrel

Claims (4)

This air gun is provided with an inner barrel through which a spherical bullet is passed and fired from the tip thereof, characterized in that part or all of the inner barrel has a substantially equilateral triangular cross section. An air gun comprising an inner barrel through which a spherical bullet is passed and fired from the tip thereof, wherein the vicinity of the tip of the inner barrel has a substantially equilateral triangular cross section. The air gun according to claim 2,
An air gun, wherein the vicinity of the tip of the inner barrel has a downward cross-sectional shape of a substantially triangular shape with one corner facing the direction of gravity. A method for manufacturing an inner barrel for an air gun according to any one of claims 1 to 3,
A step of inserting a mandrel having a diameter equal to or less than that of the spherical bullet into the metal tube having a perfectly circular cross section, and pressing the portion where the mandrel is inserted in the axial direction with three mold parts positioned around it. A method of manufacturing an inner barrel for an air gun, characterized by comprising a step of pressing the inner barrel into a substantially equilateral triangular cross section.

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