JP2003279299A - Bullet with spacer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide bullets with a spacer which are shot from one shooting device even if they have various outer diameters. <P>SOLUTION: The bullet with the spacer has: the spacer (a) having an opening part for inserting the metallic bullet from one direction, a dividing part reaching an outer peripheral part from the opening part, and a blocking-up part existing on the side opposed to the opening part; the metallic bullet (b), and a cartridge (c), and is characterized in that the spacer (a) is arranged in a tip part of the cartridge (c). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bullet with a spacer.

[0002]

2. Description of the Related Art A shell currently used is made of metal having an outer diameter corresponding to the inner diameter of a launcher, and is directly pressed into a cartridge case. Therefore, a launching device is required for each bullet, and conversely, a launching device is required for each outer diameter of the bullet.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a spacer-equipped bullet capable of firing metal bullets having various outer diameters from a single launching device.

[0004]

These objects are achieved by the present invention described in (1) and (2) below. (1) Spacer (a) having an opening through which a metal bullet can be inserted from one direction, a divided portion extending from the opening to the outer peripheral portion, and a closing portion on the side opposite to the opening, and a metal bullet (b) When,
A bullet having a cartridge case (c), said spacer (a)
A bullet with a spacer characterized in that is provided at the tip of the cartridge case (c). (2) The bullet with a spacer according to (1), wherein the tip of the opening of the spacer is located closer to the tip than the maximum outer diameter portion of the metal bullet.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a bullet with a spacer of the present invention will be described in detail. The spacer-equipped bullet of the present invention includes a spacer (a) having an opening through which a metal bullet can be inserted from one direction, a divided portion extending from the opening to the outer peripheral portion, and a closed portion on the side opposite to the opening. A bullet having a metal bullet (b) and a cartridge case (c), characterized in that the spacer (a) is provided at the tip of the cartridge case (c).

A bullet with a spacer of the present invention will be described based on a preferred embodiment. FIG. 1 is a schematic side sectional view showing an example of a bullet with a spacer of the present invention. The spacer-equipped bullet 1 has a metal bullet 2, a spacer 3, and a cartridge case 4. The metal bullet 2 is inserted through the opening 31 of the spacer 3. When the metal bullet 2 is inserted into the spacer 3, the tip of the opening 31 is outside the tip of the metal bullet 2, and the metal bullet 2 is completely inside of the opening 31. Therefore, the tip of the opening 31 is closer to the tip side (right side in the drawing) than the maximum outer diameter portion 21 of the metal bullet. The spacer 3 on which the metal bullet 2 is mounted is provided at the tip of the cartridge case 4. Spacer 3 carrying metal bullet 2 provided at the tip of this cartridge case 4
Is attached to a launching device (not shown) and fired.

FIG. 2 is an enlarged view of the spacer used in the present invention. FIG. 2A shows a side view of only the spacer,
(B) shows a sectional view when a metal bullet is inserted. The spacer 3 includes an opening portion 31, a dividing portion 32 extending from the opening portion to the outer peripheral portion, and a closing portion 33. The spacer 3 is made of resin, and the metal bullet 2 is inserted therein.

The spacer 3 in which the metal bullet 2 is inserted releases the restraint of the metal bullet 2 by expanding the opening 31 of the spacer 3 by air resistance immediately after being released from the fired device. Therefore, the metal bullet 2 can fly without being affected by the air resistance applied to the spacer 3.

The resin used for the spacer of the present invention is preferably a thermoplastic resin that can be easily injection-molded, and the type thereof is not particularly limited. As the resin, for example, olefin resin, urethane resin, polyamide resin,
One or more resins selected from acrylic resins are preferable. As a result, the sliding property with the metal is good and the deformation and melting due to the temperature rise in the device can be prevented. As a result, the spacer openings can be enlarged by air resistance immediately after being fired and released from the device. Among the above resins, a polyamide resin is particularly preferable. This allows
In particular, heat resistance and slidability with metal can be improved.

Although not shown, the cartridge case 4 contains explosives for firing bullets and a detonator. When a shock is applied to the detonator and a trigger is pulled, explosive powder explodes at once. This explosive force pushes the rear part of the spacer to fly. Immediately after exiting the muzzle, air resistance is applied to the opening of the spacer, and the spacer separates from the bullet.

[0011]

The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited thereto. (Example 1) Production of spacer The spacer is a nylon 66 based on a polyamide resin in a thermoplastic resin and blended with 10% by weight of polyethylene in order to improve slidability with metal (NE22 manufactured by UBE).
00) was selected as a spacer. Spacer molding is
It was molded under the conditions of 270 ° C. and 30 kg / cm ² using an injection molding machine. A spacer having a shape of a molded product as shown in FIG. 2A (outer diameter 7.95 mm, length 13.5 mm, thin portion outer diameter 7.60 mm, thin portion length 12 mm) was molded. The inner diameter was adjusted to the outer diameter of the metal bullet.

A metal bullet and a shell metal bullet have a length of 10 mm and a maximum diameter of φ5.36 m.
m, 3 g bullet with a maximum diameter of 7 mm in length was used. The case used had an outer diameter of 7.62 mm.

(Embodiment 2) The outer diameter of the metal bullet is 5.47 mm.
The same procedure as in Example 1 was carried out except that the above was used.

(Embodiment 3) The outer diameter of the metal bullet is 5.35 mm.
The same procedure as in Example 1 was carried out except that the above was used.

(Embodiment 4) The outer diameter of the metal bullet is 2.62 mm.
The same procedure as in Example 1 was carried out except that the above was used.

The firing performance was evaluated using the bullets with spacers obtained in the above-mentioned examples. The results obtained are shown in Table 1. Firing performance is shown in Fig.
The evaluation was performed using the launching device 5 shown in FIG. That is, the collision position measuring plate 6 of the spacer is installed at a position 1 m from the release part of the launching device 51 and 2 m from the launching device.
A bullet collision position measuring plate 7 was installed at the position.

The spacer is a collision position measuring plate 6 for the spacer.
However, the separability was evaluated by the method shown in FIG. That is, the position 62 where the spacer is separated (two positions because the spacer is divided into two) is evaluated by the distance from the position 61 where the central axis of the launching device is extended. Further, the bullet passes through the hole 63 in the center of the plate 6 and hits the collision position measuring plate 7 of the bullet.
In FIG. 4, the straightness of the bullet was evaluated by the distance from the position 71, which is the extension of the central axis of the launcher, at the position 72 at which the bullet collided. The caliber of the launching device used for evaluation was 7.62 mm.

The separability of the spacer and the deviation from the center were evaluated. Separability was evaluated by determining the deviation of the impact position of the bullet. ◎: Excellent separability ○: Good separability ×: Poor

[0019]

[Table 1]

As is clear from the table, Examples 1 to 4 are
It was excellent in maintaining the speed without impeding the separating property of the spacer and the straightness and flying property of the metal bullet.

[0021]

According to the present invention, by inserting a bullet into a spacer having an inner diameter corresponding to the outer diameter of the bullet and installing the spacer in the cartridge case, it is possible to fire various bullets having the same caliber and an outer diameter smaller than the caliber. become.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a bullet with a spacer of the present invention.

2A and 2B show a shape of a spacer, FIG. 2A is a side view, and FIG. 2B is a sectional view when a bullet is inserted.

FIG. 3 is a schematic sectional view of a launching device and a device for observing a flying state.

4A and 4B are plan views of a spacer and a plate for measuring a collision position of a bullet, FIG. 4A is a spacer collision position measuring plate, and FIG. 4B is a bullet collision position measuring plate.

[Explanation of symbols]

1 bullet with spacer 2 metal bullets 21 Outermost part of metal bullet 3 spacers 31 opening 32 divisions 33 Block 4 shell case 5 Launcher body 51 launch mouth 6 Spacer collision position measurement plate 61 Extension position of launcher center axis 62 Spacer collision position (2 places) 63 bullet passage hole 7 bullet collision position measurement plate 71 Extension position of launcher center axis 72 bullet collision position

Claims (2)

[Claims] 1. A spacer (a) having an opening through which a metal bullet can be inserted from one direction, a divided portion extending from the opening to the outer peripheral portion, and a closing portion on the side opposite to the opening, and a metal bullet ( A bullet having a spacer (b) and a cartridge case (c), wherein the spacer (a) is provided at the tip of the cartridge case (c). 2. The bullet with a spacer according to claim 1, wherein the tip of the opening of the spacer is closer to the tip than the maximum outer diameter portion of the metal bullet.