JP2001330396A - Barrel of rifle gun or shot gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a barrel of rifle gun or shot gun having a good loading of the cartridge into the chamber. SOLUTION: The barrel of rifle or shot gun has an opening 12a at a forcing cone contact face 11a contacting the forcing cone 31a of a cartridge case 31, and a cartridge 30 is obliquely inserted into the opening 12a from the bolt 40 downside. A chamfered guide 12b for guiding the cartridge 30 into the chamber 10 is formed on the lower edge of the opening 12a to prevent the cartridge 30 from deflecting laterally during inserting into the opening 12a, thereby improving the loading.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrel of a gun used for hunting, and more particularly to a rifle or a shotgun in which a packet is obliquely inserted into a medicine chamber from below a breech hole.

[0002]

2. Description of the Related Art Conventionally, the barrel of a gun used for hunting includes a barrel for a rifle having a rifling portion over substantially the entire length of a barrel, and a barrel for a shotgun having no rifling portion in the barrel. General. In recent years, the rifling portion is partially formed on the side of the medicine chamber in the gun cavity, and a guide portion having an enlarged diameter is provided in front of the rifling portion. Shotgun barrel with good rifling (utility model registration No. 3001142)
No.) has also been proposed. And, the loading mechanism of the barrel into the barrel medicine chamber includes a bolt action type, a slide action type, a lever action type, a barrel retreat type,
There are various modes, such as a gas pressure play bottom retreat type, in which the actual package is obliquely inserted into the medicine chamber from the bottom side of the play bottom.

[0003] However, in the barrel of the conventional rifle or shotgun described above, regardless of whether a single shot or a shot is used, the actual package inserted obliquely from the lower side of the breech hole into the medicine chamber remains oblique. May be caught at the boundary between the medicine room and the medicine room, or may not be fully loaded in the medicine room and may not be able to be fired, resulting in improper loading. The rate of defective loading was high. Further, according to the barrel of the shotgun with a rifling described above, when shot, the outer peripheral surface of the warhead passing through the rifling portion is scratched by a rifling groove, and the explosive combustion gas is guided through the scratch. The propellant is propelled before the warhead in the portion, but at this time, since the guide portion is expanded in diameter, the explosive propelled before the warhead passes between the inner peripheral surface of the guide portion and the scratch on the outer peripheral surface of the warhead The amount of combustion gas is large. Then, the explosive combustion gas rapidly decelerates in front of the warhead, and the decelerated explosive combustion gas becomes a resistance of the succeeding warhead, so that the propulsive force of the warhead is reduced and the trajectory of the fired warhead is improper. There has been a problem that the stability becomes higher, and the accuracy of hits also decreases with these phenomena. Thus, with this conventional shotgun with a rifling, although the hitting accuracy is better than that of a shotgun without a rifling portion, further improvement of the hitting accuracy has been demanded together with the above-mentioned improper loading.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a rifle gun or a shotgun barrel having a good loading property of a package in a medicine chamber. In particular, a second object of the present invention is to provide a barrel of a shotgun which has a good loading property of a packet in a medicine chamber and has improved hit accuracy when a single shot is fired.

[0005]

As a technical means of the present invention for solving the above-mentioned problems, a first aspect of the present invention has an opening in a leading edge contact surface for contacting a leading edge of a cartridge case. In the barrel of a rifle or shotgun into which an actual package is inserted obliquely from the lower side of the breech hole in the opening, a guide chamfer for guiding the actual package into the medicine chamber is formed at the lower edge of the opening. Features. According to the above technical means, the actual package inserted obliquely into the medicine chamber from the lower side of the play bottom is guided by the guide chamfered portion at the lower side of the outer peripheral surface of the cartridge case. The cartridge is smoothly loaded into the medicine chamber without being caught at the boundary with the room or being in an incomplete state where it is not completely loaded into the medicine chamber.

That is, in the barrel of a conventional rifle or shotgun, when the actual package is obliquely inserted into the medicine chamber from the lower side of the bottom of the rifle, its surface, such as its tip, warhead, connection between the warhead and the cartridge case, etc. The bent portion slides on the inner peripheral upper surface of the medicine chamber. Then, the actual package that has received the sliding contact resistance has the lower half of the outer peripheral surface thereof in contact with the lower half of the opening edge of the medicine chamber, while remaining oblique. Since the contact is an unstable line contact, the actual package is swung right and left by receiving the sliding contact resistance. Therefore, due to this, the actual package is not inserted smoothly into the interior of the medicine chamber, and a loading failure occurs. In particular, in the case of the slender No. 410 package, because of its slenderness, the stability in the above-mentioned oblique state is poor, and the loading failure is likely to occur.

The inventor of the present application has found that the improper loading of the actual package is caused by the mechanism described above, and by forming the guide chamfer below the opening in the medicine chamber,
Even if the actual package received the sliding contact resistance in an oblique state, it was experimentally confirmed that the actual package was stable without being swung to the left and right, and was smoothly inserted into the interior of the medicine room, thereby completing the present invention.

According to a second aspect of the present invention, the guide chamfered portion is formed at a lower edge of a substantially lower half of the opening. According to this technical measure, the entity is
Since a substantially lower half portion of the outer peripheral surface of the cartridge case is guided to the guide chamfered portion, the cartridge case is smoothly inserted into the medicine chamber in a more stable state.

According to a third aspect of the present invention, the barrel has a length of 410 mm.
It is characterized in that it is formed for a watch case.

According to a fourth aspect of the present invention, the barrel has a rifling portion having a length equal to or less than の of a barrel length of a shotgun barrel formed on the side of the barrel of the barrel. In addition, the depth of the rifling groove in the rough ring portion is set to 1/1.
The rifling groove is set within a range of 5 to 1/25 mm, and the bottom surface of the rifling groove is flush with the inner peripheral surface of the front half of the gun cavity on the front side of the rifling portion. According to this technical means, since the depth of the rifling groove is relatively shallow, the damage to the outer peripheral surface of the warhead due to the rifling groove immediately after firing is shallow. In addition, since the bottom surface of the rifling groove is flush with the inner peripheral surface of the barrel at the front side of the rifling portion, the warhead passes between the inner peripheral surface of the barrel and the wound on the outer peripheral surface of the warhead. The explosive combustion gas propelled earlier than before is minimized. Therefore, the resistance of the warhead due to the explosive combustion gas in the gun cavity is small, the decrease in the propulsion force of the warhead is reduced, and the trajectory of the fired bullet is stabilized.

The rifling groove has a depth of 1/15.
If the diameter is larger than mm, the flaws attached to the outer peripheral surface of the warhead become deeper, and the amount of explosive combustion gas propelled through the flaws before the warhead increases. Then, the propulsive force of the warhead decreases due to the resistance of the explosive combustion gas, and the trajectory of the fired warhead tends to become unstable. Also, the depth of the rifling groove is １ ／
If it is smaller than 5 mm, the sliding of the rifling groove to the warhead passing through the gun cavity is reduced, and the fired warhead cannot obtain a sufficient rotation force, so that the trajectory becomes unstable. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the barrel of a shotgun according to the invention.

The barrel A has a medicine chamber 10 on the rear end side, and a gun cavity 20 connected to the front side of the medicine chamber 10, and a rifling portion 21 is formed on the rear side of the medicine chamber 20. At the same time, the length L1 of the rifling portion 21 is set to be equal to or less than 1/2 of the length L2 of the gun cavity 20, so that the barrel of the shotgun with a rifling adapted to legal regulations such as the gun sword control law. No. 410 actual package 30 consisting of a cartridge case 31 and a warhead 32
Is loaded into the medicine chamber 10.

The medicine chamber 10 is recessed on the bottom surface 10a of the barrel A following the shape of the leading edge 31a of the cartridge case 31.
The leading edge accommodating concave portion 11 formed so that the leading edge portion 31a comes into contact with the leading edge contact surface 11a, and the leading edge contact surface 1
1a has an opening 12a at the center thereof,
And the cylindrical portion 12 formed in a substantially hollow cylindrical shape following the portion excluding the starting edge portion 31a (see FIGS. 3A and 3B).

The cylindrical portion 12 at the center of the edge contact surface 11a
A guide chamfered portion 12b is formed at the lower edge of substantially the lower half of the opening 12a. The guide chamfered portion 12b is machined by a milling machine. In detail, a milling cutter having substantially the same outer diameter as the body 31b of the cartridge case 31 is inclined, and the lower edge of the opening 12a is cut with the inclined blade surface. The cut surface is polished to reduce the sliding contact resistance when the actual package 30 is inserted, and is formed so that the lower half of the body portion 31b is slid in contact with the cartridge case 31 in an inclined state. It is.

The inclination angle α of the guide chamfered portion 12b (see FIG. 3B) and the dimension W from the lower end of the inner surface of the cylindrical portion 12 to the lower end of the guide chamfered portion 12b (FIG. 3).
(See (a)) is appropriately adjusted according to the mounting elasticity of the actual package 30. In a preferred example of the present embodiment, the inclination angle α is set to approximately 45 degrees, and the dimension W is set to 5.
It is set within a range of 5 mm or less, more preferably 3.5 mm or less.

In the illustrated example, the guide chamfered portion 12b is provided at a lower edge of a substantially lower half of the opening 12a as a particularly preferred example. If it does, it is not limited to the above embodiment. For example, the guide chamfered portion 12b is
a may be provided in a range of one-third of the lower edge or a quarter of the lower edge. Further, the guide chamfered portion 12b may be provided on the entire peripheral edge of the opening 12a.

The rifling portion 21 has a plurality of spiral rifling grooves 21a (carpentines) formed by dividing the length L2 of the barrel 20 by 1 / L.
The length L1 is set to 2 or less, and the bottom surface of each rifling groove 21a is formed so as to be flush with the inner peripheral surface of the gun barrel front half portion 22 on the front side of the rifling portion 21. The groove depth H of the rifling groove 21a is set to a predetermined dimension.

In the barrel of a well-known rifle and shotgun with a rifling, the depth of the rifling groove is set to approximately 1/10 mm. However, in the barrel A of the present embodiment, The groove depth H of each rifling groove 21a is set within a range of 1/15 to 1/25 mm, and particularly preferably, approximately 1/20 mm. The inner diameter of the barrel half 22 is set substantially equal to the outer diameter of the warhead 32 of the actual package 30. With the setting of the groove depth H, the barrel A of the present embodiment reduces the depth of the flaw applied to the warhead 32 by the rifling groove 21a, and reduces the distance between the flaw and the inner peripheral surface of the gun cavity front half 22. The amount of explosive combustion gas propelled ahead of the warhead 32 through the warp is minimized.

The actual package 30 is a 410-th actual package in which a predetermined member such as an explosive is accommodated in a brass cartridge case 31 and a metal warhead 32 made of copper or lead is caulked at the tip portion. Any of the hand-packed packages may be used.

Thus, according to the barrel A having the above-described configuration, when the barrel A is mounted on the breechhole 40 of the gun and loaded, the actual package 30
Is inserted obliquely into the cylindrical portion 12 of the medicine chamber 10 from below the play bottom 40 of the gun, and in the oblique state, the bent portion of the warhead 32 and the connection portion between the warhead 32 and the cartridge case 31 are inserted into the medicine chamber 10. Is brought into sliding contact with the inner peripheral upper surface of the cylindrical portion 12,
Since b is guided and guided by the guide chamfered portion 12b, the body portion 31b of the cartridge case 31 is smoothly inserted into the cylindrical portion 12 of the medicine chamber 10 without being swung right and left.

When the loaded actual packet 30 is hit, the damage to the warhead 32 is shallow due to the shallow rifling groove 21a, and the bottom surface of the rifling groove 21a and the inner periphery of the barrel half 22 are reduced. Since the plane is flush with the plane, the amount of explosive combustion gas propelled ahead of the warhead 32 through the space between the wound of the warhead 32 and the inner peripheral surface of the barrel half 22 is minimized. Is suppressed. Therefore, the fired warhead 32
The trajectory is stable with little decrease in propulsion.

In the above embodiment, the guide chamfered portion 12b is provided on the barrel of a shotgun with a rifling. However, the guide chamfered portion 12b is provided on the barrel of a shotgun without a rifling, or a rifle. Even in the case of being provided on the barrel of the gun, the same operation and effect as described above can be obtained in the loadability of the actual package.

The loading mechanism in the gun to which the barrel A having the above structure is assembled is a bolt action type, a slide action type, a lever action type if the actual package is inserted obliquely into the medicine chamber from the lower side of the breech hole. Any of well-known loading mechanisms such as a retractable type, a barrel retractable type, and a gas pressure floating type retractable type may be used, but a bolt action type loading mechanism is preferably applied.

In addition, the above-mentioned actual packet 30 is exemplified by a single bullet packet using a brass cartridge case 31, but the barrel A of the present embodiment is used.
Can also be used for shotguns using plastic pods.

[0026]

Since the present invention is configured as described above, it has the following effects. (Claim 1) A real package inserted obliquely into the medicine chamber from the lower side of the play bottom is guided by the guide chamfered portion on the outer peripheral surface of the cartridge case, so that the tip of the real package, the warhead portion, and the connection portion of the warhead Even if the device receives sliding contact resistance from the upper surface of the medicine chamber, it may be caught in the boundary between the breech bed and the medicine room in an oblique state, or may not be fully loaded inside the medicine room, resulting in an incomplete loading condition. Never wake up. Therefore, it is possible to provide a barrel of a rifle or a shotgun, which makes it possible to extremely smoothly load the actual package into the medicine chamber. (Claim 2) In addition, by forming the guide chamfered portion substantially in the lower half of the opening on the bottom surface side of the package, the loadability of the actual package can be further improved. (Claim 3) In particular, if the barrel is formed for a 410-barrel, the slender barrel can reduce the weight, thereby improving the hunting behavior and significantly improving the loadability of the 410-barrel as compared with the prior art. be able to. (Claim 4) Further, the depth of the rifling groove in the barrel of a shotgun with a rifling is 1/15 to 1/25 m.
When the single shot is used, the trajectory of the fired bullet is remarkably stabilized. Therefore, in addition to the above-described good packaging ability, the shot with a rifling having a good hit accuracy is also provided. A gun can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of the barrel of a shotgun according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a state where an actual package is inserted into a medicine chamber of the barrel.

FIG. 3 (a) shows an enlarged rear end surface of the barrel,
(B) is an enlarged cross-sectional view of the medicine chamber portion of the barrel.

FIG. 4 is an enlarged sectional view taken along line (4)-(4) in FIG.

[Explanation of symbols]

 10: Medicine room 11a: Edge contacting surface 12a: Opening 12b: Guide chamfered portion 20: Gun cavity 21: Rifling portion 21a: Rifling groove 22: Front half of gun cavity 30: Real package A: Barrel H: Groove depth

Claims (4)

[Claims] 1. A barrel of a rifle or shotgun in which an opening is provided in a leading edge contacting surface for contacting a leading edge of a cartridge case, and an actual package is obliquely inserted into the opening from the lower side of the breech hole. A barrel for a rifle or shotgun, wherein a guide chamfer for guiding an actual package into a medicine chamber is formed at a lower edge of the opening. 2. The barrel of a rifle or shotgun according to claim 1, wherein the guide chamfer is formed at a lower edge of a substantially lower half of the opening. 3. The barrel of a rifle or shotgun according to claim 1, wherein the barrel is formed for a No. 410 packet. 4. The shot barrel according to claim 1, wherein said barrel has a rifling portion having a length equal to or less than の of a barrel length on a chamber side of said barrel. The depth of the rifling groove in the part
4. The method according to claim 1, wherein the bottom surface of the rifling groove is flush with the inner peripheral surface of the front half of the gun cavity on the front side of the rifling portion. 3. The barrel of the shotgun according to any one of 3.