JP2006313028A - Spherical projectile and firing set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a spherical projectile capable of achieving high accuracy of fire by stabilizing rotation, and to provide the structure of a firing set. <P>SOLUTION: Moment of inertia around principal inertia axis α out of three principal inertia axes α, β, γ of the spherical projectile 1a is made larger than the moment of inertial around other principal inertia axes β, γ. A mass increased part 10 made heavier by coating (printing) coating material in a belt shape around a circumference is installed in a portion perpendicularly crossing to the principal inertia axis α and crossing to a virtual plane passing through the center of gravity. The moment of inertia of either one axis out of perpendicularly crossed three principal inertia axes passing through a point where is the center of the spherical projectile and the center of gravity is increased to form the principal inertia axis having the maximum moment of inertia, and thereby, stable rotation is generated and continued around the principal inertia axis. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The spherical bullet of the present invention and its launching device fire a spherical bullet using a compressed fluid (compressed gas) such as compressed air, carbon dioxide gas or Freon gas. For example, in a toy gun, a spherical bullet (so-called BB bullet or paintball) ) To achieve a more accurate shooting by generating a stable rotation around a predetermined axis.

  The spherical bullet is used, for example, in a toy air gun. Airguns fire spherical bullets with compressed air. At this time, it is described in, for example, Patent Document 1 and the like that a lift is applied to a spherical bullet by rotating upward about an axis (horizontal axis) perpendicular to the direction of gravity (horizontal axis) to increase the flight distance. . This also contributes to ballistic stability. In the past, the focus was on the structure of the launcher, how to give this rotation to the spherical bullet. For this reason, the spherical bullet itself was only required to have a homogeneous performance with a true sphere, no burrs, and no cavities inside. In other words, it is a solid sphere made of a homogeneous material. In this case, the spherical bullet can take three orthogonal axes passing through the center as inertia principal axes, and each inertia principal axis has the same moment of inertia. The main inertial axis is the same regardless of the orientation of the three orthogonal axes passing through the center of the spherical bullet.

  In the case of a rifle or the like that fires an actual bullet, a method of stabilizing the trajectory by giving a bullet rotation around the propulsion direction is known. However, this method is difficult to apply to a spherical bullet which is a bullet of a toy air gun. In addition, it cannot coexist with a method of obtaining buoyancy (lift) by giving upward rotation about an axis perpendicular to the direction of gravity to fly a lightweight spherical bullet further.

  On the other hand, it is often seen that the moment of inertia is increased by placing a mass near the outer skin in order to improve the flying performance of the golf ball. However, the golf ball has a structure in which moments of inertia are equally allocated to the three principal axes of inertia as in the case of a conventional spherical bullet. Therefore, the inertial main axis can be freely adopted as long as it is three orthogonal axes passing through the center of the golf ball. Because the golf ball must be hit several times until the hole-in, if the moment of inertia around one specific axis is large as in the present invention, the trajectory will be blurred in shots other than tee shot and putting that cannot be aligned. is there. Since the spherical bullets that are the subject of the present invention are released for the purpose of shooting, they may be aligned once before shooting.

  A conventional spherical bullet and its launcher are shown below using FIG. FIG. 1A shows the structure of a conventional spherical bullet 1. It is made of a uniform material so that the center of gravity is the center of the sphere, and the dimensions are accurate so that it is close to a true sphere so that no bubbles are introduced during manufacture. FIG. 1B shows a conventional spherical bullet launcher 2. Since the spherical bullet 1 and its launching device 2 are toys, safety must be ensured and not much energy can be given to the spherical bullet 1 (gas pressure is regulated by law). However, there is a demand to fly the spherical bullet 1 farther. Therefore, the conventional launching device 2 has a feature that the spherical bullet 1 is caused to fly to a long distance by applying upward rotation and generating upward lift.

  FIG. 2 shows a rifle 3 and a rifle 4 that fire real bullets. The rifle 3 has a barrel 5 with a spiral groove 6, and a rotational force is applied when the rifle 4 passes through the barrel 5. The trajectory is stabilized because it flies while rotating with respect to the propulsion direction of the rifle 4.

  FIG. 3 shows a golf ball 7 intended to increase the moment of inertia. Since the moment of inertia increases in proportion to the square of the distance between the principal axis of inertia and the mass, a heavy material is disposed in a portion near the outer skin 8 far from the center.

JP-A-6-3091

As described above, in the past, contrivances have been made to extend the flight distance by rotating the spherical bullet 1. The accuracy of the shooting at this time is mainly due to the improvement of the accuracy of the launching device 2, and the spherical bullet 1 requires only a homogeneous and highly accurate object. The spherical bullets used for air guns in mainstream toys in Japan are as small as 6-8 [mm] in diameter and are as light as 0.1-0.4 [g], making it difficult to improve accuracy.
Therefore, in view of the present situation described above, an object of the present invention is to provide a structure of a spherical bullet and a structure of a launching apparatus capable of improving the shooting accuracy by stabilizing the rotation.

Among the spherical bullets and the launching device thereof according to the present invention, the spherical bullet described in claim 1 is a spherical one that is launched based on the pressure of the compressed fluid.
In particular, in the spherical bullet of the present invention, the moment of inertia around one of the principal axes of inertia that passes through the center of gravity and is orthogonal to each other is the moment of inertia around the other principal axis of inertia. It is larger than

According to a fifth aspect of the present invention, there is provided a spherical bullet firing device for firing a spherical bullet based on the pressure of a compressed fluid.
In particular, the spherical bullet launching apparatus of the present invention is an arrangement means for arranging the spherical bullet in a state in which an inertia main axis (inertia main axis having the maximum inertia moment) with a large inertia moment is directed in a direction perpendicular to the launch direction. And a rotation imparting means for giving the spherical bullet rotation about the inertia main axis together with the launch of the spherical bullet.

According to the spherical bullet and the spherical bullet launching apparatus of the present invention, the moment of inertia of any one of the three orthogonal principal axes passing through the center of the spherical bullet and the center of gravity is increased, and the maximum By using the inertia main shaft having the inertia moment of, it is possible to easily generate and sustain stable rotation around the inertia main shaft.
That is, the object (rigid body) passes through the center of gravity and has three principal axes of inertia that are orthogonal to each other. These three inertia spindles are composed of an inertia spindle having the maximum inertia moment, an inertia spindle having an intermediate inertia moment, and an inertia spindle having the minimum inertia moment. Physically, rotation around the principal axis of inertia with the maximum and minimum moments of inertia is stable, and rotation around the principal axis of inertia with an intermediate moment of inertia becomes unstable.
In the case of the spherical bullet of the present invention, there is one inertia spindle having the maximum moment of inertia and two inertia spindles having the minimum moment of inertia. In this case, it is most stable when rotated around the principal axis of inertia having the maximum moment of inertia.
Then, by providing rotation around the inertia main axis having the maximum moment of inertia that is most stable in this way, the trajectory of the spherical bullet can be stabilized and high accuracy can be obtained.

Preferably, when the spherical bullet described in claim 1 is implemented, a portion where a virtual plane that intersects perpendicularly to one of the principal axes of inertia and passes through the center of gravity intersects the surface as described in claim 2 Is made heavier than the other parts, so that the moment of inertia around the inertia main axis becomes larger than the moment of inertia around the other main axis of inertia. In this case, preferably, as described in claim 3, the portion is made heavy by coating (for example, printing) the paint around the entire circumference of the surface that intersects the virtual plane. In addition, you may make the said part heavy, for example by shaping | molding by the material from which penetration | infiltration, pinching, interruption | interruption, a hollow, a material density change, and mass differs.
With this configuration, it is possible to provide, at a low cost, a spherical bullet in which the moment of inertia around one of the three principal axes of inertia perpendicular to each other is larger than the moment of inertia around the other principal axis of inertia.

Preferably, when carrying out the present invention, preferably, as described in claim 4, a mark serving as a reference for orienting an inertial spindle having a large inertial moment (an inertial spindle having the maximum inertial moment) in a predetermined direction. Is provided. As such a mark, a magnetic substance, coloring, a conductor, etc. can be used preferably, for example.
With this configuration, it is possible to easily recognize the inertia main axis (the direction thereof) having the maximum moment of inertia of the spherical bullet.

Further, when implementing the spherical bullet launching device described in claim 5, preferably, as described in claim 6, the positioning means targets the tip of a nozzle (barrel) for firing the spherical bullet. In this state, the spherical bullet is placed in a state in which the inertia main axis (inertia main axis having the maximum inertia moment) with a large inertia moment is horizontal. The rotation imparting means also imparts upward rotation in the firing direction about the inertia main axis to the spherical bullet with the tip of the nozzle facing the target.
If comprised in this way, a stable hop rotation will be given to a spherical bullet, and while this spherical bullet is made to fly further away, a more precise trajectory can be obtained stably.

In carrying out the present invention, preferably, as described in claim 7, in a state where the tip of the nozzle for firing the spherical bullet is directed to the target, the disposing means places the spherical bullet on the moment of inertia. It is also possible to arrange the inertial main axis with a large angle in a horizontal state, and the rotation imparting means may impart a downward rotation in the firing direction around the inertial main axis to the spherical bullet. Further, as described in claim 8, in a state where the tip of the nozzle for firing the spherical bullet is directed to the target, the disposing means directs the spherical bullet in a vertical direction with the inertia main axis having a large moment of inertia. The rotation imparting means can impart leftward or rightward rotation in the firing direction around the inertia main axis to the spherical bullet.
Furthermore, when adopting these configurations, as described in claim 9, a plurality of nozzles are provided, and each rotation imparting means provided for each of these nozzles is applied to a spherical bullet fired from each nozzle. , Rotations in different directions can also be given.

  With this configuration, the trajectory of the spherical bullet can be controlled and bent in any direction, and the spherical bullet can be scattered up and down and left and right as needed. That is, in order to fly upward, as described above, the inertial spindle with a large inertial moment (the inertial spindle having the maximum inertial moment) is leveled and the launch direction around the inertial spindle is upward. Rotation (upward rotation about an axis perpendicular to the direction of gravity) is given. Further, in order to fly downward, similarly, the inertia main axis is horizontal and a downward rotation in the firing direction about the inertia main axis (down rotation around an axis perpendicular to the direction of gravity) is given. Further, in order to fly to the right, the rotation in the launch direction rightward (rotation in the right direction around the axis in the direction of gravity) is given with the inertial main axis oriented in the vertical direction. Also, in order to fly leftward, the leftward rotation in the firing direction about the inertial main axis (leftward rotation around the gravity direction axis) is given with the inertial main axis oriented in the vertical direction. And if necessary, the ballistic trajectory of the spherical bullet can be bent in a desired direction by applying a rotation in a predetermined direction with the inertial spindle having a large moment of inertia directed in a predetermined direction.

In carrying out the present invention, preferably, as described in claim 10, when the rotation imparting means is brought into sliding contact with a part of the surface of the spherical bullet when the spherical bullet is launched, The slidable contact portion that gives a rotation around an axis orthogonal to the firing direction of the spherical bullet. Along with this, the arrangement means arranges the spherical bullet in a state where the virtual plane that intersects the inertia main axis with a large moment of inertia perpendicularly and passes through the center of gravity coincides with the sliding contact portion. And
If comprised in this way, the rotation of a predetermined direction can be given to the inertia main axis | shaft which enlarged the moment of inertia with a simple structure.

When the present invention is carried out, preferably, as described in claim 11, a coating containing a magnetic material is applied in a strip shape over the entire circumference of the surface of the spherical bullet that intersects the virtual plane. Then, it is assumed that the arrangement means aligns the spherical bullets in a state where the virtual plane and the sliding contact portion coincide with each other based on the magnetic force. In this case, the magnet constituting the arrangement means is provided inside the magazine for storing the spherical bullet before firing as described in claim 12, or the spherical bullet is fired as described in claim 13. It can be provided inside the nozzle. In addition, in order to align the spherical bullets in this way, a color identification sensor, a conduction sensor, etc. can be used in addition to the magnetic force. In this case, for example, a predetermined coloring or a conductor is attached to the spherical bullet.
With this configuration, the intended rotation around the inertia main axis (inertia main axis having the maximum inertia moment) with a large inertia moment can be provided accurately and reliably.

  4 to 6 show an embodiment of the present invention. Of these, FIG. 4 shows a spherical bullet 1a corresponding to the spherical bullet described in the claims, FIG. 5 shows a launching device 2a, FIG. 6 shows an arrangement means 9, and FIG. 7 shows an arrangement means 9a. FIG. 8 shows another example of the launching device 2b and the arrangement means 9b, respectively. The spherical bullet 1a of the present embodiment is a spherical one similar to the conventional spherical bullet 1 (see FIG. 1) which is the so-called BB bullet or paintball described above, and is compressed air or carbon dioxide gas by a toy gun such as an air gun. Alternatively, it is fired based on the pressure of a compressed fluid (compressed gas) such as Freon gas. In particular, in the case of the spherical bullet 1a of the present embodiment, as shown in detail in FIG. 4, the inertia of any one of the three inertial main axes α, β, γ that pass through the center of gravity and are orthogonal to each other. The moment of inertia around the main axis (in the present embodiment, around the α axis) is made larger than the moment of inertia around the other inertia main axis (in the present embodiment, around the β, γ axes).

  For this reason, in the case of the present embodiment, the portion of the surface of the spherical bullet 1a that intersects the imaginary plane perpendicular to the α axis and passes through the center of gravity G is compared with other portions. It is heavy. More specifically, by coating (for example, printing) the paint around the entire circumference of the surface of the spherical bullet 1a on the part intersecting with the virtual plane, the part is compared with other parts. A weight-increased mass increasing portion 10 is provided. In addition, the said part can be made heavier than other parts by the penetration | infiltration, pinching, interruption | interruption, hollowing, and the change of material density, for example, and the part increased in this way can also be used as the mass increase part 10. FIG. In the case of the present embodiment, as described later, the mass increasing portion 10 includes a magnetic material (the magnetic material is included in the paint constituting the mass increasing portion 10), thereby reducing the moment of inertia. The increased inertial principal axis α (inertial principal axis α having the maximum moment of inertia) is a mark that serves as a reference for directing the predetermined direction. In addition, as such a mark, the said mass increase part 10 can be colored with a different color from another part, or a thing etc. can also be included.

  Further, the launching device 2a of the present invention for firing the spherical bullet 1a as described above fires the spherical bullet 1a based on the pressure of the compressed fluid, similarly to the above-described conventional launching device 2 (see FIG. 1). To do. Particularly in the case of the present embodiment, as shown in FIG. 6, the spherical bullet 1a is oriented so that the inertial principal axis α (inertial principal axis α having the maximum inertial moment) with a large inertial moment is orthogonal to the launch direction. As shown in FIG. 5, when the spherical bullet 1a is launched, the spherical bullet 1a is rotated around the inertia main axis α as shown in FIG. 5 (in this example, the tip of the barrel 5a is Rotation imparting means 11 for providing a rotation in the firing direction upward (rotation in the direction of arrow A in FIG. 5) around the inertia main axis α in a state of being directed to the target. Of these, the rotation imparting means 11 is constituted by a sliding contact portion 12 made of an elastic material such as rubber, and when the spherical bullet 1a is fired, it comes into sliding contact with a part of the surface of the spherical bullet 1a. Thus, a rotation (rotation in the direction of arrow A in FIG. 5) about the axis (inertial main axis α in the present embodiment) orthogonal to the firing direction of the spherical bullet 1a is given to the spherical bullet 1a. Further, the arrangement means 9 arranges the spherical bullet 1a in a state where the virtual plane that intersects the inertial principal axis α and passes through the center of gravity G and the sliding contact portion 12 coincide with each other.

  In the case of the present embodiment, the sliding contact portion 12 is arranged in the vertical direction on the inside surface of the barrel 5a with the tip of the barrel 5a corresponding to the nozzle described in the claims directed to the target. In addition to being provided in the upper portion, the arrangement means 9 is also arranged with the tip of the barrel 5a facing the target and the spherical bullet 1a with the inertial main axis α being horizontal. For this reason, in the case of the present embodiment, as described above, the mass increasing portion 10 of the spherical bullet 1a includes a magnetic body, and the inner surface of the base end portion (structure of FIG. 5) of the barrel 5a, or A magnet 14 such as a permanent magnet or an electromagnet is provided inside the magazine 13 (a structure shown in FIG. 6) for storing a plurality of the spherical bullets 1a and 1a before being fired, and the spherical bullets 1a are based on the magnetic force of the magnet 14. 1a can be arranged in a predetermined direction. In the case of the present embodiment, the magnet 14 is provided on the inner surface of the barrel 5a or the inner surface of the magazine 13 over the traveling direction of the spherical bullets 1a and 1a. Further, one magnet 14 may be provided on the inner surface of the magazine 13 as shown in FIG. 6, or opposite to each other at positions 180 degrees opposite to each other on the inner surface of the magazine 13a as shown in FIG. Two pieces may be provided in the state.

  The arrangement means 9 can be provided not only in the magazines 13 and 13a as described above, but also in the barrel 5b over the entire length of the barrel 5b as shown in FIG. In this case, even when the spherical bullet 1a passes through the barrel 5b, the state in which the inertial main axis α is directed in a predetermined direction (for example, the horizontal direction) can be maintained. In the present embodiment, the arrangement means 9, 9a, 9b are composed of the magnets 14, but as described above, in order to align the spherical bullets 1a, 1a, a color identification sensor, a conduction sensor, etc. Can also be used. In this case, for example, a predetermined coloring or a conductor is attached to each of the spherical bullets 1a and 1a.

  According to the spherical bullet 1a of this embodiment and the launching device 2a of the spherical bullet 1a as described above, the spherical bullet 1a can be stably rotated around the inertial main axis α, and this rotation can be easily maintained. . For this reason, a stable hop rotation is given to the spherical bullet 1a, and the spherical bullet 1a can be thrown farther and a more accurate trajectory can be stably obtained.

  Although not shown in the drawing, the spherical bullet 1a is arranged with the inertial main axis α in a horizontal state with the tips of the barrels 5a, 5b facing the target, and the inertial main axis α is rotated by the rotation applying means 11. It is also possible to give a downward rotation in the launch direction around the center. Further, the spherical bullet 1a can be arranged with the inertial main axis α oriented in the vertical direction, and the rotation imparting means 11 can rotate leftward or rightward in the firing direction around the inertial main axis α. When these configurations are adopted, a plurality of barrels 5a and 5b are provided, and the barrels 5a and 5b are fired by the rotation imparting means 11 and 11 provided for each barrel 5a and 5b. The spherical bullets 1a and 1a can be rotated in different directions.

(A) shows a conventional spherical bullet, and (B) shows a conventional launcher. The structure of a rifle was shown for comparison with the present invention. For comparison with the present invention, the structure of a golf ball having a large moment of inertia is shown. The spherical bullet of the present invention is shown. A mass is given by printing a magnetic material on a portion colored in black to increase the moment of inertia around the illustrated axis. Also, the rotation axis is recognized by this part. The spherical bullet launcher of the present invention is shown. An apparatus for aligning spherical bullets of the present invention is shown. Another example of the spherical bullet alignment means of the present invention is shown. Another example of the spherical bullet launching device and alignment device of the present invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Spherical bullet 2, 2a, 2b Launcher 3 Rifle gun 4 Rifle bullet 5, 5a, 5b Barrel 6 Groove 7 Golf ball 8 Outer skin 9, 9a, 9b Arrangement means 10 Mass increase part 11 Rotation imparting means 12 Sliding part 13, 13a Magazine 14 Magnet

Claims (13)

  In a spherical bullet (hereinafter referred to as a spherical bullet) that is launched based on the pressure of the compressed fluid, the moment of inertia around the inertial principal axis of any of the three inertial principal axes that pass through the center of gravity and are orthogonal to each other. A spherical bullet characterized by a larger moment of inertia around other inertial main axes.   By making the part where the imaginary plane passing through the center of gravity perpendicular to any inertia main axis intersects the surface and the surface heavier than the other parts, the inertia moment around the inertia main axis The spherical bullet according to claim 1, wherein the spherical bullet is larger than the moment of inertia around the main axis.   The spherical bullet according to claim 2, wherein the portion of the surface that is intersected with the virtual plane is coated with a coating around the entire circumference to make the portion heavy.   The spherical bullet according to any one of claims 1 to 3, wherein a mark serving as a reference for directing an inertial spindle with a large moment of inertia in a predetermined direction is provided.   A spherical bullet launching apparatus that launches a spherical bullet based on the pressure of a compressed fluid, and arranging the spherical bullet in a state in which an inertia main axis with a large moment of inertia is oriented in a direction perpendicular to the firing direction And a device for imparting rotation to the spherical bullet, which imparts rotation about the inertia main axis to the spherical bullet.   In a state where the tip of the nozzle for firing the spherical bullet is directed to the target, the arrangement means arranges this spherical bullet in a state where the inertia main axis with a large moment of inertia is horizontal, and the rotation applying means is 6. The spherical bullet launching apparatus according to claim 5, wherein the spherical bullet is given an upward rotation in the firing direction around the inertia main axis.   In a state where the tip of the nozzle for firing the spherical bullet is directed to the target, the arrangement means arranges this spherical bullet in a state where the inertia main axis with a large moment of inertia is horizontal, and the rotation applying means is 6. The spherical bullet launching device according to claim 5, wherein the spherical bullet is given a downward rotation in the firing direction around the inertia main axis.   With the tip of the nozzle for launching a spherical bullet facing the target, the placement means places this spherical bullet with the inertial spindle with a large moment of inertia oriented in the vertical direction and imparted rotation 6. The spherical bullet launching apparatus according to claim 5, wherein the means gives the spherical bullet a leftward or rightward rotation in a firing direction around the inertia main axis.   A plurality of nozzles, and each rotation imparting means provided for each nozzle gives rotation in a different direction to the spherical bullet fired from each nozzle. A spherical bullet launcher according to item 1.   When the rotation imparting means shoots a spherical bullet, it comes into sliding contact with a part of the surface of the spherical bullet, thereby giving the spherical bullet a rotation around an axis orthogonal to the firing direction of the spherical bullet. And the disposing means disposes the spherical bullet in a state where it intersects the imaginary plane perpendicular to the principal axis of inertia having a large moment of inertia and passes through the center of gravity with the sliding contact portion. A launcher for a spherical bullet according to any one of claims 5 to 8.   A portion of the surface of the spherical bullet that intersects the virtual plane is coated with a coating containing a magnetic substance over the entire circumference, and the arrangement means applies the spherical bullet based on the magnetic force to the virtual plane and the sliding contact portion. The apparatus for launching a spherical bullet according to claim 10, wherein the devices are aligned in a state in which they are aligned.   The spherical bullet launching device according to claim 11, wherein the magnet constituting the disposing means is provided inside the magazine for storing the spherical bullet before firing. The spherical bullet launching device according to claim 11, wherein a magnet constituting the disposing means is provided inside a nozzle for firing a spherical bullet.

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