JP3499173B2 - Airgun spherical bullet firing structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a structure for firing a spherical bullet in an air gun. 2. Description of the Related Art An air gun that fires a spherical bullet with a pressurized gas (usually used carbon dioxide gas or compressed air, etc.) has its gas pressure regulated by law for safety. The range and hit accuracy (straightness), which are important performance points for play equipment, are limited by the gas pressure regulations. For this purpose, various devices have been proposed for improving the range and accuracy of hitting. For example, as a structure of an air gun for firing a spherical bullet by the above-described pressure gas, for example, Japanese Patent Application Laid-Open No.
The thing disclosed in -173099 is known. The firing mechanism disclosed herein will be described with reference to FIG.
The spherical bullet 5 supplied from the magazine to the chamber 1 via the supply port 2 is advanced to the O-ring 4 when the trigger is pulled, and at the same time, the gas pressure of the cylinder or the like is introduced into the chamber 1. Push the O-ring 4 and expand the barrel 3
It is configured so that it is fired inside and accelerated while passing through the barrel 3 to give straightness. According to such a spherical bullet firing mechanism, since the spherical bullet 5 merely pushes and expands over the entire circumference of the O-ring 4 with a substantially uniform pressure by the gas pressure, it is almost always spherical. The bullet 5 will be fired without rotation. Therefore, under the above-mentioned regulated gas pressure (low pressure), not only the range (flying distance) does not increase, but also
The accuracy of the hit (straightness) cannot be improved. [0004] In order to overcome this problem, most recently, the rotation of a spherical bullet upward, that is, the axis of rotation that is perpendicular to the center axis of the barrel held horizontally, is taken as the rotation axis. The muzzle is rotated left (counterclockwise) in a side view when viewed from the right, thereby obtaining buoyancy using the air resistance that the spherical bullet rotating with the rotation axis receives during flight, thereby extending the flight distance. The idea was proposed.
As one example, a solution means disclosed in Japanese Utility Model Publication No. 3-35997 is known. In order to solve this problem, a cylindrical body is provided in place of the O-ring, and a bolt is extended from above to provide a contact resistance to the spherical bullet, thereby obtaining a substantially left-handed rotation of the shaft center to increase a flight distance. It was going to stretch.
In this prior art, it is described that the contact position of the bolt with the spherical bullet can be arbitrarily changed instead of being located only on the upper side thereof (at this time, the purpose of controlling the trajectory is described). According to the theory of air and experimental results, the spherical bullet is rotated leftward in a side view when the muzzle is viewed to the right, with the axis of rotation being the axis perpendicular to the center axis of the barrel held horizontally in the horizontal direction ( It has been confirmed that the flight distance increases only when the ball is turned counterclockwise. [0005] However, according to the above-mentioned solution of Japanese Utility Model Publication No. 3-35997, there are the following problems. First, since the upper part of the elastic cylinder is depressed toward the center with the tip of a small bolt, the cross section of the deformed elastic cylinder is, as shown in FIG. When the spherical bullet is inscribed (in the moment of firing) without forming a perfect circle, voids are formed in both upper parts of the spherical bullet,
As a result, the gas pressure escapes, so that the sealing effect is extremely poor and the flight distance is not increased. Second, once adjusted, the bolt is fixed due to threading with the chamber. Therefore, it is difficult to adjust the amount of protrusion (recess depth), and the upper part of the elastic cylinder pressed by the bolt is sandwiched between the tip of the bolt and the spherical bullet to be fired, and the spherical bullet passes at high speed. The elastic cylinder is significantly worn due to the impact of the cracking, easily cracks and cannot withstand long-term use. At the same time, the impact of the spherical bullet on the bolt causes the bolt to be easily loosened, so that fine adjustment is always required. Third, as a result of the experiment, the straightness (hit rate) of the spherical bullet was not secured. this is,
When the spherical bullet is fired against the upper part of the elastic cylinder, it is left-rotated at the moment when the spherical bullet passes through the narrow part of the elastic cylinder, and at the same time hops in the barrel, and Turbulence in the barrel due to the fast gas that passes through the gaps on the upper sides of the crushed spherical bullet (because of no resistance) and the gas that has passed through the gap between the hopped spherical bullet and the bottom of the barrel As a result, the attitude of the spherical bullet becomes unstable, and the above-described rotation of the spherical bullet to the left itself cannot be ensured, and the straightness is likely to be impaired. Incidentally, it should be noted that in this type of air gun, the spherical bullet is generally smaller than the inner diameter of the barrel by about 0.1 mm. SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention secures the straightness (hit rate) of a spherical bullet and does not require any difficult fine adjustment, and does not involve wear of parts. It is an object of the present invention to provide a structure for firing a spherical bullet in an air gun capable of extending the distance. [0010] In order to achieve the above object, a spherical bullet firing structure for an air gun according to the present invention is configured as follows. Plastic pressure using gas pressure
Barrel of an air gun that fires a spherical bullet 5
At the attachment between 3 and chamber 1, barrel 3
Eccentric cutting of the upper portion 3a of the base end portion of
Through the holder supported by the
And insert the barrel into position 1 and fix the barrel.
The center axis X1 of the bar 1 is aligned with the center axis X2 of the barrel 3.
And displace it just below, and place it on the proximal end of the barrel in the chamber.
The O-ring 4 is disposed at a position where the O-ring 4 comes into contact with the O-ring 4.
The center axis X1 is the same as the center axis X1 of the chamber 1.
However, the barrel 3 is displaced just below the center axis X2 . The air gun referred to in the present invention is generally called an air soft gun in the art, and is fired by using compressed air or various liquefied gases contained in a cylinder, and may be of a single-shot type or a continuous type. . The O-ring may be made of a known rubber used in this type of air gun, and is a generally used equivalent cylinder (also used in the above cited prior art). You may. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a spherical bullet firing structure of an air gun according to the present invention will be described below in detail with reference to FIGS. As shown in FIGS. 1 and 2, reference numeral 1 denotes a chamber, in which a generally used firing mechanism (for example, a known technique as shown in FIG. 4) is provided. Therefore, illustration and detailed description thereof are omitted here. Reference numeral 2 denotes a supply port for a spherical bullet 5 provided in the chamber 1. The supply port 2 is connected to a magazine, in which a large number of spherical bullets 5 are accommodated. This spherical bullet 5
Is made of plastic and has a diameter of 6 mm in a normal standard. Spherical bullet 5 entering chamber 1 through supply port 2
Is sent to the proximal end of the barrel 3 by a known firing mechanism. In attaching the barrel 3 to the chamber, the center axis X1 of the chamber 1 is largely displaced substantially directly below the center axis X2 of the barrel 3 (0.
6 to 1.0 mm is appropriate). This displacement causes the upper part 3a of the barrel 3 to be eccentrically cut (outer diameter 8.6).
This is inserted into the chamber 1 via a holder supported by the holder attaching section 6, and the barrel is fixed in position and attached. The outer diameter of the barrel 3 is usually 10 mm, and the inner diameter is 6.1 mm. Therefore, the difference (clearance) between the spherical bullet 5 and the inner diameter of the barrel 3 is 0.1 mm. Immediately after entering the spherical bullet 5 and the barrel 3 obliquely upward, this 0.1 mm gap is formed. Reference numeral 4 denotes an O-ring known per se, which is usually made of rubber, and is inscribed in the chamber 1 and exerts a sealing function when the spherical bullet 5 is fired. The central axis X1 of the O-ring 4 is the same as the central axis (X1) of the chamber 1. That is, when the spherical bullet 5 is fired, the center axis of the O-ring 4 abutting on the base end surface of the barrel 3 is also displaced substantially directly below the center axis of the barrel held horizontally. Become. As shown in FIG. 3, reference numeral 3b denotes a chamfer formed on the inner periphery of the bottom of the base end of the barrel 3.
Accordingly, when the spherical bullet 5 passes through the O-ring 4, the lower side of the spherical bullet 5 abuts on the chamfered portion 3b, and the axis center is orthogonal to the center axis X2 of the barrel 3 held horizontally. With the rotation axis as the center of rotation, a rotation in which the muzzle is rotated leftward in a side view when viewed to the right is obtained. The chamfered portion 3b is provided with a spherical bullet 5 in consideration of the displacement of the central axis X1 of the O-ring 4.
, The lower side is large enough to contact the chamfer 3b. In other words, the size of the chamfered portion 3b in the radial direction is the amount of displacement of the central axis X1 of the O-ring 4 (the amount of displacement between the central axis of the barrel 3 and the central axis of the chamber 1). The angle α of the chamfered portion 3b with respect to the center axis of the barrel 3 is preferably 45 degrees, 30 degrees or an angle similar thereto. As shown in FIG. 3, the barrel of the barrel 3 has a center axis X2 of the barrel of the barrel 3 (ie, the inner diameter of the barrel 3).
Is the central axis X1 of the chamber 1 (the central axis of the outer diameter of the barrel 3)
The opening is displaced upward so as to be located higher. The barrel 3 is mounted in the chamber 1 so that its muzzle is located at an upper position, and an O-ring is provided in the chamber 1 at a position in contact with the base end surface of the barrel 3. In the structure of an air gun for firing a plastic spherical bullet 5 using gas pressure as in the present embodiment, the inner peripheral edge at the bottom of the base end surface of the barrel 3 is chamfered, and the spherical bullet 5 is fired. At this time, the spherical bullet 5 is fired with the center axis X1 of the O-ring 4 abutting on the base end face of the barrel 3 displaced substantially directly below the center axis X2 of the barrel 3 held horizontally. When the spherical bullet 5 passes through the O-ring 4, a part of the firing air is passed through a gap between the lower portion of the spherical bullet 5 and the inner lower surface of the barrel 3, thereby holding the spherical bullet 5 horizontally. By rotating the muzzle counterclockwise in a side view when the muzzle is viewed to the right with the axis perpendicular to the central axis X2 of the barrel 3 in the horizontal direction as the rotation axis, and firing the barrel 3 in the chamber 1, Center axis X of chamber 1 By displacing the central axis X1 of the O-ring contained in the chamber 1 substantially directly below the central axis X2 of the barrel 3, and providing the chamfered portion 3b at the bottom inner peripheral edge of the base end surface of the barrel 3. In addition, the base end of the barrel 3 is configured as an eccentric barrel with its upper side cut, so that a displacement between the center axis X2 of the barrel 3 and the center axis X1 of the chamber 1 is obtained, so that a predetermined firing is achieved. The spherical bullet 5 supplied into the chamber 1 by a mechanism (a well-known configuration as shown in FIG. 4) has the following effects. First, at the time of firing, when the spherical bullet 5 passes through the O-ring 4 which is in contact with the base end face of the barrel 3 under the action of gas pressure, the O-ring 4 is bolted as in the prior art. Since it is not deformed and is merely held in the chamber 1, it maintains a substantially perfect circle, and therefore can be in close contact with the spherical bullet 5 over the entire circumference, has a good sealing effect, and has a high gas pressure. Does not leak, so that it can be effectively sealed. Further, since the O-ring 4 is in close contact with the spherical bullet 5 over the entire circumference, even when the O-ring 4 is pushed and spread, it is possible to obtain substantially uniform spread over the entire circumference, and the posture of the spherical bullet 5 is stabilized. Is obtained. Second, at the same time as the spherical bullet 5 passes through the O-ring 4 under the action of gas pressure, the lower side of the spherical bullet 5 comes into contact with the chamfered portion 3b, and the sliding resistance is used here. The lower portion of the spherical bullet 5 is rotated leftward in a side view when the muzzle is viewed to the right, with the rotation axis being the axis that is perpendicular to the center axis of the horizontally held barrel, and the barrel 3 is rotated. To the upper inside surface. Therefore, the rotational force of the spherical bullet 5 is
Since the spherical bullet 5 is accelerated, the bullet velocity is not reduced, and the slip resistance in the chamfered portion 3b is used. In comparison, the forward resistance is small, and the decrease in the bullet velocity can be further prevented. Third, a spherical bullet 5 advanced into the barrel 3
Moves forward (orients) toward the upper inner surface of the barrel 3 and comes into contact with the upper inner surface, and as a result, the gap between the lower surface of the spherical bullet 5 and the bottom of the barrel is surely ensured. Thus, a part of the firing air passes through the gap (clearance) between the spherical bullet 5 and the bottom of the barrel at a high speed while rolling on the upper inner surface in the barrel 3 of the spherical bullet 5, and as a result, the spherical bullet 5 is more spherical. The gun 5 is moved forward in the barrel 3 and fired while accelerating the rotation of the bullet 5. Therefore,
As a result, the upper inner surface of the barrel 3 can be rolled while the penetration into the barrel 3 is obliquely upward, thereby improving the straightness of the spherical bullet 5. Fourth, if the center axis X2 of the barrel 3 and the center axis X1 of the chamber 1 are displaced by eccentric cutting for cutting the upper side of the barrel 3, the processing can be simplified. From the above, the object of the present invention is to provide a barrel 3
And the center axis X1 of the chamber 1 (O-ring 4
With the same central axis) and chamfering the inner edge of the barrel 3 end face. However, it should be noted that conventionally, in order to secure and improve the straightness (hit rate) of a spherical bullet, the center axis X2
It is common technical knowledge (according to the prior art shown in FIG. 4 and also to the theory of a real gun) to increase the accuracy of aligning the center axis X1 of the chamber 1 with the center axis X1 in a straight line. Was not considered at all. According to the present invention, gas pressure is used.
Air gun that fires a plastic bullet 5
At the attachment between barrel 3 and chamber 1
Then, the upper part 3a of the base end of the barrel 3 is eccentrically cut.
Holder with eccentric cutting part supported by holder mounting part 6
Into the chamber 1 through the
The center axis X1 of the chamber 1 inside the barrel 3
Displaced just below the center axis X2,
An O-ring 4 is arranged at a position where it comes into contact with the base end surface of the barrel.
The central axis X1 of the O-ring 4 is the central axis of the chamber 1
X1 and just below the center axis X2 of the barrel 3.
Has the following effects. First, the spherical bullet 5 in the chamber 1 is
The barrel is oriented at the same time as passing through the O-ring 4, and the barrel is rotated leftward in a side view when the muzzle is viewed to the right, with the axis of rotation being a horizontal axis perpendicular to the center axis of the horizontally held barrel. 3, it is possible to reliably form a gap between the lower surface of the spherical bullet 5 and the bottom of the barrel 3, and a part of the firing air passes through this gap at a high speed. As a result, the spherical bullet 5 is further rotated leftward, so that fine adjustment of the bolt is not required as in the prior art, and the spherical bullet 5 can be straightened without decreasing the bullet velocity and further. The flight distance can be remarkably increased while being improved, and further, there is no need to replace parts due to abrasion when a conventional spherical bullet is rotated, and high performance can be maintained for a long period of time. Secondly, since the center axis of the muzzle of the barrel 3 and the center axis of the chamber 1 are very simple, the manufacturing cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional side view of a main part of an air gun according to the present invention. FIG. 2 is an enlarged vertical sectional side view of a main part of the air gun according to the present invention. FIG. 3 is an end view of a barrel end portion of the air gun according to the present invention. FIG. 4 is a longitudinal sectional side view of a main part of an air gun showing a conventional technique. [Description of Signs] 1 chamber 3 barrel 4 O-ring 5 spherical bullet X1 center axis of chamber X2 center axis of muzzle of barrel

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-173099 (JP, A) JP-A-3-64387 (JP, U) JP-A-6-22792 (JP, U) JP-A-2-2 109192 (JP, U) Jiko 3-35997 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F41B 11/00

Claims (1)

(57) [Claims] [Claim 1] A plastic spherical bullet using gas pressure
Barrel 3 and chamber in air gun firing round 5
1 and above the base of barrel 3.
Eccentric cutting of the side part 3a and mounting of the eccentric cutting part with a holder
Inserted into the chamber 1 via a holder supported by the
Insert the barrel and fix it in place, center of chamber 1
The axis X1 is changed directly below the center axis X2 of the barrel 3.
Position where it comes into contact with the barrel end face in the chamber.
The O-ring 4 is disposed, and the central axis X1 of the O-ring 4 is
The same as the center axis X1 of the chamber 1 and inside the barrel 3
A spherical bullet firing structure for an air gun characterized by being displaced directly below the center axis X2 .