JP2010091246A - Autoloading bolt assembly for air gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein an existing autoloading bolt assembly for an air gun includes a complicated structure and requires high manufacturing costs. <P>SOLUTION: A simple piston-cylinder mechanism is provided for reducing the number of parts of an autoloading bolt assembly for an air gun. This significantly reduces the number of components to successfully reduce manufacturing costs significantly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an automatic loading bolt assembly that is operated with the pressure of a compressed gas in a cylinder incorporated in an air gun.

  The majority of sniper gun bolts are manual bolts. The manual bolt is manually operated by the shooter when the bullet is loaded into the gun chamber. An automatic loading bolt assembly reduces the burden on the shooter by automating the operation of the manual bolt using the pressure of the compressed gas. One such self-loading bolt assembly is disclosed in U.S. Pat. No. 3,572,310 (issued to Chiba on March 23, 1971) for an air gun. As shown in FIG. 5 of the above-mentioned patent, the disadvantage of the conventional automatic loading bolt assembly for an air gun is that the structure is complicated and the number of parts is large. In addition, since a strong spring 34 disclosed in the above Patent Column 3, line 36 is required, a large reaction force when a bullet is fired is also a disadvantage of the conventional automatic loading bolt assembly for an air gun. .

  As described above, the conventional self-loading bolt assembly for an air gun has a fatal defect that the reaction during bullet firing is large.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic loading bolt assembly having a novel structure for an air gun, which has a simple structure and a very small reaction when a bullet is fired.

  In order to achieve the above object, the present invention provides an automatic loading bolt assembly basically comprising: a cylinder formed coaxially with the barrel in the barrel tail end; and axially movable in the cylinder. A total of three parts: a hollow piston that is coaxially “swift-fitted” and a firing needle that is coaxially and axially movable in the hollow piston.

  As described above, the self-loading bolt assembly of the present invention is composed of only three parts. The individual parts are also simple in structure. Therefore, the automatic loading bolt assembly of the present invention can manufacture individual parts at low cost. These parts are easy to assemble.

Hereinafter, the form of the Example of this invention is demonstrated based on FIG.

  As shown in FIG. 1, the self-loading bolt assembly of the present invention basically includes: a cylinder 10 formed coaxially with the barrel 2 in the tail end of the barrel 2; and axially movable within the cylinder 10. A hollow piston 6 that is coaxially “squeezed” in a simple state; and a firing pin 9 that is coaxially and axially movable in the hollow piston 6; .

      As shown in FIG. 1, the air gun of the present invention comprises: a barrel 2; an automatic loading bolt assembly (10, 6, 9) incorporated in the barrel 2; a magazine 15; and a trigger 13.

      The magazine 15 has a structure for storing a plurality of bullets 1 therein. Such a structure is disclosed in detail in the aforementioned US Pat. No. 3,572,310. The entire contents of the U.S. patent are hereby incorporated herein by reference.

      The magazine 15 stores a plurality of bullets 1 therein. The plurality of bullets 1 are aligned in a magazine 15 and placed on a bullet support base. The support base is elastically biased upward by a compression spring, thereby feeding the bullet 1 upward. As shown in FIG. 1, the magazine 15 is mounted in a snap-on manner on a magazine receiving portion provided on the barrel 2.

      In the automatic loading bolt assembly (10, 6, 9), compressed gas is supplied into the cylinder 10 from a compressed gas cylinder (not shown) via the intake port 14 in the state of FIG. 1. Then, under the pressure of the compressed gas, the hollow piston 6 moves backward toward the trigger 13 to its retracted position. The retracted position of the rear large-diameter portion of the hollow piston 6 is partially shown by an imaginary line in FIG. Incidentally, the hollow piston 6 is a component generally called a bolt.

      When the hollow piston 6 is retracted to its retracted position, the front small diameter portion 3 of the hollow piston 6 opens the upper opening of the magazine 15. Then, the uppermost bullet 1 in the magazine 15 enters the barrel 2 through the upper opening.

      On the other hand, when the hollow piston 6 is retracted to its retracted position, the gap 11 between the rear large diameter portion of the cylinder 10 and the rear large diameter portion of the hollow piston 6 is enlarged. Therefore, the pressure of the compressed gas passes around the rear compressed gas receiving portion 5 of the hollow piston 6 through this enlarged gap 11. Then, under the pressure of the compressed gas that has entered the rear compressed gas receiving portion 5, the hollow piston 6 moves forward in the barrel 2 in the direction opposite to the trigger 13 side, so that the bullet 1 is Advance to the indoor launch position. The firing position of the bullet 1 is shown in FIG. An O-ring 01 is fitted to the rear wall of the cylinder and seals the outer periphery of the rear diameter large portion of the firing pin. An O-ring 02 is fitted into the cylinder front wall to seal the outer periphery of the hollow piston front small diameter portion. An O-ring 03 is fitted into the hollow piston firing needle receiving portion 4 to seal the outer periphery of the front small diameter portion of the firing needle 9. The O-ring 04 is fitted into the inner wall portion of the barrel 2 and seals the outer periphery of the front small-diameter portion 3 of the hollow piston 6 disposed at the forward movement position.

      In this manner, when the trigger 13 is pulled by the shooter after the bullet 1 is placed at the firing position in FIG. 1, the firing pin 9 is detached from the trigger 13, so that the firing needle 9 has a rear large-diameter shoulder 12. Due to the pressure of the compressed gas applied to the hollow piston 6, the opening of the O-ring 03 in the hollow piston 6 is suddenly retracted relative to the hollow piston 6. Then, the pressure of the compressed gas filled in the cylinder 10 is ejected to the rear surface of the bullet 1 in the barrel 2 through the opening of the O-ring 03.

      Thus, when the bullet 1 in the barrel 2 is fired from the barrel 2 to the outside of the muzzle by the pressure of the compressed gas, the pressure in the barrel 2 is rapidly reduced to atmospheric pressure. Naturally, the pressure in the cylinder 10 communicating with the barrel 2 also drops abruptly. Then, new compressed gas is supplied from the cylinder into the cylinder 10 via the intake port 14.

0017

      On the other hand, the firing needle 9 retracted by the pressure of the compressed gas compresses a return spring provided at the rear of the firing needle 9. The striker 9 is moved forward by the restoring force of the compressed return spring and reengages with the trigger 13. At this time, the firing needle 9 engaged with the trigger 13 is biased upward by the restoring force of the compression spring provided at the lower end of the trigger 13 as apparent from FIG. By the restoring force of the spring, it is engaged again with the concave portion of the firing needle 9. Accordingly, the trigger 13 engaged with the firing needle 9 prevents the firing needle 9 from retreating due to the pressure of the compressed gas, as shown in FIG. That is, the firing needle 9 is held at the position where the firing needle 9 shown in FIG. The

      Thereafter, when the trigger 13 is pulled and the bullet 1 in the barrel 2 is fired from the barrel 2 to the outside of the muzzle by the pressure of the compressed gas, a new compressed gas is introduced from the cylinder into the cylinder 10 via the intake port 14. Is supplied. Accordingly, the pressure of the compressed gas causes the hollow piston 6 to be retracted rearward in the direction of the trigger 13 to reach the retracted position indicated by an imaginary line in FIG.

      When the hollow piston 6 reaches its retracted position, the gap 11 between the rear large diameter portion of the cylinder 10 and the hollow piston 6 is expanded. Accordingly, the pressure of the compressed gas passes around the compressed gas receiving portion 5 behind the hollow piston 6 through the enlarged gap 11. Then, under the pressure of the compressed gas that has flowed into the rear compressed gas receiving portion 5, the hollow piston 6 advances in the barrel 2 in the direction opposite to the trigger 13 side, and the magazine 15 The next bullet 1 is advanced to the firing position in the chamber. The firing position of this bullet 1 is shown in FIG.

      When the hollow piston 6 moves forward in the muzzle direction, the air between the front end wall of the cylinder 10 and the hollow piston 6 is compressed. The compressed air is “clearance-fitted” by the hollow piston 6 into the cylinder 10. Therefore, it can escape to the rear of the hollow piston 6 through the “clearance” between the hollow piston 6 and the cylinder 10. For this reason, the air compressed between the front end wall of the cylinder 10 and the hollow piston 6 does not prevent the forward movement of the hollow piston 6 in the muzzle direction.

      Thus, the loading operation of the gun bullet 1 from the first bullet 1 to the next bullet 1 by the automatic loading bolt of the present invention is completed without any interruption. Therefore, according to the present invention, the shooter can concentrate the nerve only on the shooting until the bullet 1 of the magazine 15 is exhausted by simply pulling the trigger 13 of the gun.

  The center longitudinal section of the automatic loading bolt assembly for air guns showing the embodiment of the present invention.

Explanation of symbols

1 bullet;
2 barrels;
3 Hollow piston front small diameter part;
4 Hollow piston strike receiving part;
5 hollow piston rear compressed gas receiving part;
6 hollow piston;
10 cylinders;
11 enlarged gap between cylinder and hollow piston;
12 Large diameter shoulder at the rear of the firing pin;
13 trigger;
14 Intake port;
15 magazines;
01 O-ring that fits into the rear wall of the cylinder and seals the outer periphery of the large diameter portion at the rear of the firing pin;
02 O-ring that fits into the front wall of the cylinder and seals the outer periphery of the small diameter front portion of the hollow piston;
03 O-ring that fits into the hollow piston firing pin receiving part and seals the outer periphery of the front small diameter part of the shooting needle; O-ring.

Claims (1)

A cylinder formed coaxially with the barrel within the barrel tail; a hollow piston coaxially “squeezed” in an axially movable state within the cylinder; coaxially within the hollow piston In an automatic loading bolt assembly for an air gun consisting of a firing needle incorporated in a movable state in the axial direction,
The cylinder has a cylindrical shape and consists of a small diameter front part and a large diameter rear part,
The hollow piston is “fitted” in the cylinder and is movable in the axial direction of the cylinder in the cylinder, the gap between the cylinder and the hollow piston being at the rear of the hollow piston. Enters the rear large diameter part of the cylinder, and the compressed gas easily passes through the enlarged gap and enters the compressed gas receiving part of the rear part of the hollow piston so that the hollow piston faces the muzzle. Advancing, thereby placing a bullet in the barrel in front of the hollow piston at a predetermined firing position in the chamber;
The firing pin has a rod-like shape, and receives the pressure of compressed gas at the rear large-diameter shoulder of the firing needle, and retracts the firing needle in a direction opposite to the muzzle direction to be blocked by the firing needle. The O-ring opening is opened, and the compressed gas in the cylinder is ejected to the rear surface of the bullet to fire the bullet,
The air between the front wall of the cylinder and the hollow piston is compressed as the hollow piston moves forward relative to the cylinder, and the hollow piston and cylinder are “fitted” into the cylinder. Through the "clearance" between the cylinder and the rear of the hollow piston, thereby preventing the forward movement of the hollow piston by the air compressed between the front wall of the cylinder and the hollow piston. An automatic loading bolt assembly for air guns.

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