backstop

Abstract

To provide a backstop that is excellent in durability and difficult to ricochet. The backstop 1 includes a bullet velocity reduction layer 2 that reduces the velocity of a bullet b by allowing it to penetrate, and a bullet stopping layer 3 that repels and catches the bullet b that has penetrated the bullet velocity reduction layer 2 without allowing it to penetrate. The bullet velocity reduction layer 2 and the bullet stopping layer 3 are arranged apart from each other.

Description

[Technical Field]

[0001] The present invention relates to a backstop that is placed behind a target at a live-fire training range to catch bullets. [Background technology]

[0002] Patent Document 1 discloses an inclined backstop that forms a rubber chip layer on a base with a moderately inclined surface and covers the rubber chip layer with a rubber sheet material, so that bullets that penetrate the rubber sheet material are captured and collected by the rubber chip layer. With the configuration of Patent Document 1, the viscoelasticity of the rubber material prevents ricochets even when fired at close range, and bullets can be collected in their original shape without being shattered. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-9926 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the configuration of Patent Document 1, if a bullet that has been lodged in the rubber chip layer collides with another bullet, a ricochet is inevitable. Also, if a large number of bullets are lodged in the rubber chip layer, the weight of the lodged bullets may damage or deform the inclined backstop itself, potentially preventing it from maintaining its function as a backstop.

[0005] An object of the present disclosure is to provide a backstop that is highly durable and ricochet resistant. [Means for solving the problem]

[0006] According to the present disclosure, there is provided a backstop including a bullet velocity reduction layer that reduces the velocity of a bullet by allowing the bullet to penetrate, and a bullet stopping layer that repels and intercepts a bullet that has penetrated the bullet velocity reduction layer without allowing the bullet to penetrate, wherein the bullet velocity reduction layer and the bullet stopping layer are arranged apart from each other. [Effects of the Invention]

[0007] According to the present disclosure, a backstop that is highly durable and less susceptible to ricochets is realized. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side cross-sectional view of a backstop (first embodiment). [Figure 2] 10 is a side cross-sectional view of the backstop (second embodiment). [Figure 3] 10 is a side cross-sectional view of the backstop (third embodiment). [Figure 4] 10 is a side cross-sectional view of the backstop (fourth embodiment). DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential means for solving the problems. For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are designated by the same reference numerals, and repeated explanations are omitted as necessary.

[0010] In the following embodiments, when necessary for convenience, the description will be divided into multiple sections or embodiments, but unless otherwise specified, they are not unrelated to each other, and one is a partial or complete modification, application example, detailed explanation, or supplementary explanation of the other. Furthermore, in the following embodiments, when the number of elements, etc. (including the number, numerical value, amount, range, etc.) is mentioned, it is not limited to that specific number, and may be more or less than the specific number, unless otherwise specified or when it is clearly limited to a specific number in principle.

[0011] Furthermore, in the following embodiments, the components (including operational steps, etc.) are not necessarily essential unless otherwise specified or considered to be clearly essential in principle. Similarly, in the following embodiments, when referring to the shape or positional relationship of components, etc., it is intended to include those that are substantially similar or approximate to the shape, etc., unless otherwise specified or considered to be clearly not essential in principle. The same applies to the above numbers, etc. (including numbers, numerical values, amounts, and ranges).

[0012] (First embodiment) A backstop 1 according to a first embodiment will be described below with reference to Fig. 1. Fig. 1 is a side cross-sectional view of the backstop 1. The backstop 1 is a structure that is placed behind a target in a live-fire training range and is used to receive bullets.

[0013] As shown in FIG. 1, the backstop 1 includes a bullet velocity reduction layer 2 that reduces the velocity of a bullet b by allowing it to penetrate, and a bullet stopping layer 3 that repels and intercepts the bullet b that has penetrated the bullet velocity reduction layer 2 without allowing it to penetrate. The bullet velocity reduction layer 2 and the bullet stopping layer 3 are arranged apart from each other. As a result, a bullet b fired toward the backstop 1 first hits the bullet velocity reduction layer 2 and penetrates it. As the bullet b penetrates the bullet velocity reduction layer 2, the velocity of the bullet b is reduced. After penetrating the bullet velocity reduction layer 2, the bullet b flies through the space between the bullet velocity reduction layer 2 and the bullet stopping layer 3, and is then repelled and intercepted by the bullet stopping layer 3 without penetrating the bullet stopping layer 3.

[0014] The above configuration achieves a backstop 1 that is highly durable and resistant to ricochets. That is, the bullet velocity reduction layer 2 is configured to be penetrable by the bullet b, and the bullet stopping layer 3 is configured to bounce off and catch the bullet b, so the bullet b does not become lodged inside the bullet velocity reduction layer 2 or the bullet stopping layer 3, and therefore ricochets do not occur. Furthermore, because a large number of bullets b do not become lodged inside the bullet velocity reduction layer 2, the bullet velocity reduction layer 2 is not damaged or deformed by the weight of the large number of lodged bullets b, and therefore the backstop 1 has excellent durability.

[0015] As shown in Figure 1, the backstop 1 of this embodiment is a so-called vertical backstop in which a bullet b fired by a shooting trainee is incident at a right angle on the bullet velocity reduction layer 2. The bullet b penetrates the bullet velocity reduction layer 2, is bounced off and stopped by the bullet stopping layer 3, passes through the recovery space 4 between the bullet velocity reduction layer 2 and the bullet stopping layer 3, and is ejected from the backstop 1 by its own weight.

[0016] As shown in FIG. 1 , the backstop 1 may further include a support frame 5 that is rectangular in front view and supports the bullet velocity reduction layer 2 and the bullet stopping layer 3, and a plurality of installation legs 6 that support the support frame 5.

[0017] The holding frame 5 includes a top plate 5a disposed on the bullet velocity reduction layer 2 and the bullet stopping layer 3, a bottom plate 5b disposed below the bullet velocity reduction layer 2 and the bullet stopping layer 3, and a pair of side plates (not shown). The bottom plate 5b is formed with an ejection port 5d for ejecting the bullet b from the backstop 1 when the bullet b that has been repelled and caught by the bullet stopping layer 3 falls due to its own weight.

[0018] The ball velocity reduction layer 2 is configured by sandwiching a plurality of elastomer chips 8 between a pair of elastomer layers 7.

[0019] In this embodiment, each elastomer layer 7 is made of a rubber layer that is a thermosetting elastomer. The rubber plates, which are examples of rubber layers, are made of natural rubber or synthetic rubber. Synthetic rubbers are typically chloroprene rubber, nitrile rubber, ethylene propylene rubber, silicone rubber, or urethane rubber. The thickness of the rubber plates is between 5 mm and 50 mm, and preferably between 10 mm and 30 mm. However, the thickness of the rubber plates is not limited to the above values ​​and can be selected appropriately depending on the type of ammunition used in target practice.

[0020] Each elastomer layer 7 may be composed of a thermoplastic elastomer layer. The thermoplastic elastomer layer may contain at least one selected from styrene-based thermoplastic elastomers (SBS, SEBS, etc.), olefin-based thermoplastic elastomers (TPO), polyester-based thermoplastic elastomers (TPEE), polyamide-based thermoplastic elastomers (PEBA), polyurethane-based thermoplastic elastomers (TPU), and dynamically crosslinked thermoplastic elastomers (TPV). This makes it difficult for through-holes formed in the thermoplastic elastomer layer to widen due to the self-sealing properties of the thermoplastic elastomer layer, thereby suppressing the progression of damage.

[0021] The multiple elastomer chips 8 are a specific example of a bullet velocity reduction material. In this embodiment, the multiple elastomer chips 8 are made of rubber. That is, the bullet velocity reduction material is composed of multiple rubber chips. Rubber chips are generally called granulated rubber and are typically manufactured using recycled rubber from used tires or the like. The particle size of the rubber chips is between 1 mm and 100 mm, preferably between 1 mm and 50 mm, and more preferably between 3 mm and 10 mm. However, the particle size of the rubber chips is appropriately selected depending on the type of ammunition used in target practice and is not limited to the above values. The bullet velocity reduction material may also be composed of multiple thermoplastic elastomer chips. The bullet velocity reduction material may be sand. Furthermore, the bullet velocity reduction material may be a mixture containing rubber chips, thermoplastic elastomer chips, and sand.

[0022] In this embodiment, the bullet-stopping layer 3 is a metal plate made of iron or an iron alloy. The metal plate has a sufficient thickness to prevent the bullet b from penetrating through it. The thickness of the metal plate is between 5 mm and 50 mm, and preferably between 10 mm and 30 mm. However, the thickness of the metal plate is selected appropriately depending on the type of ammunition used in target practice, and is not limited to the above numerical values. The bullet-stopping layer 3 may be a ceramic plate or a plate made of a fiber-reinforced composite material instead of a metal plate.

[0023] Ceramic plates are typically made from alumina or silicon carbide, with alumina being relatively inexpensive and easy to manufacture, and silicon carbide being lightweight and strong, both of which can effectively block bullet penetration.

[0024] Fiber-reinforced composite plates are typically made from aramid fibers (Kevlar®) or ultra-high molecular weight polyethylene (UHMWPE) impregnated with resin. These fiber-reinforced composites are lightweight and flexible, yet strong, and can effectively stop a bullet by dissipating the kinetic energy of the bullet throughout the fibers.

[0025] The distance between the bullet velocity reduction layer 2 and the bullet stopping layer 3 need only be a distance that does not hinder the free fall of the bullet b, and is selected appropriately depending on the type of bullet used in target practice.

[0026] With the above configuration, the bullet b fired by the shooting trainee is decelerated by penetrating the bullet speed reduction layer 2, flies through the recovery space 4, is bounced off and caught by the bullet stopping layer 3, and then falls under its own weight and is discharged from the discharge port 5d.

[0027] The first embodiment has been described above, and the first embodiment has the following features.

[0028] The backstop 1 includes a bullet velocity reduction layer 2 that reduces the bullet velocity by allowing the bullet b to penetrate, and a bullet stopping layer 3 that repels and intercepts the bullet b that has penetrated the bullet velocity reduction layer 2 without allowing it to penetrate. The bullet velocity reduction layer 2 and the bullet stopping layer 3 are arranged apart from each other. With the above configuration, a backstop 1 that is highly durable and less likely to ricochet is achieved.

[0029] Moreover, the bullet velocity reduction layer 2 is configured by sandwiching a plurality of elastomer chips 8 between a pair of elastomer layers 7. With the above configuration, the bullet velocity of the bullet b can be effectively reduced with a simple configuration.

[0030] Furthermore, the pair of elastomer layers 7 are rubber layers, and the plurality of elastomer tips 8 are rubber tips. With the above configuration, the bullet velocity reduction layer 2 can be manufactured inexpensively.

[0031] (Second embodiment) Next, a second embodiment of the present disclosure will be described with reference to Fig. 2. Fig. 2 is a side cross-sectional view of the backstop 1. Below, the differences between this embodiment and the first embodiment will be mainly described, and overlapping descriptions will be omitted as appropriate.

[0032] In the first embodiment, each elastomer layer 7 has a single layer structure made up of either a rubber layer or a thermoplastic elastomer layer.

[0033] In contrast to this, in this embodiment, as shown in FIG. 2, each elastomer layer 7 has a multi-layer structure including a rubber layer 7a and a thermoplastic elastomer layer 7b.

[0034] The order of the rubber layer 7a and the thermoplastic elastomer layer 7b is not particularly limited. The bullet b may penetrate the thermoplastic elastomer layer 7b and the rubber layer 7a in this order, or the rubber layer 7a and the thermoplastic elastomer layer 7b in this order.

[0035] Each elastomer layer 7 may have a two-layer structure consisting of one rubber layer 7a and one thermoplastic elastomer layer 7b, or may have a multi-layer structure consisting of one or more rubber layers 7a and one or more thermoplastic elastomer layers 7b alternately laminated together.

[0036] The rubber layer 7a and the thermoplastic elastomer layer 7b constituting each elastomer layer 7 may be bonded to each other, or may simply be disposed adjacent to each other without bonding.

[0037] (Third embodiment) Next, a third embodiment of the present disclosure will be described with reference to Fig. 3. Fig. 3 is a side cross-sectional view of the backstop 1. Below, the differences between this embodiment and the second embodiment will be mainly described, and overlapping descriptions will be omitted as appropriate.

[0038] In the second embodiment, as shown in FIG. 2, the thermoplastic elastomer layer 7b covers the entire rubber layer 7a.

[0039] In contrast, in this embodiment, the thermoplastic elastomer layer 7b is disposed only in the impact area of ​​the bullet b. That is, the impact area of ​​the bullet b on the backstop 1 is limited to the vicinity of a target (not shown). Therefore, by disposing the thermoplastic elastomer layer 7b only in the impact area, it is possible to reduce the cost of replacing worn thermoplastic elastomer layer 7b.

[0040] (Fourth embodiment) Next, a fourth embodiment of the present disclosure will be described with reference to Fig. 4. Fig. 4 is a side cross-sectional view of the backstop 1. Below, differences between this embodiment and the first embodiment will be mainly described, and overlapping descriptions will be omitted as appropriate.

[0041] The backstop 1 of the first embodiment is a vertical type backstop 1 in which a fired bullet b is incident on the bullet velocity reduction layer 2 at a right angle, as shown in FIG.

[0042] However, instead of this, the backstop 1 of this embodiment is an inclined backstop 1 in which a fired bullet b is incident on the bullet velocity reduction layer 2 at an angle, as shown in FIG.

[0043] That is, depending on the installation environment of the backstop 1, typically the height of the installation space of the backstop 1, either a vertical or inclined installation posture can be adopted for the installation posture of the backstop 1.

[0044] As shown in FIG. 4, when the backstop 1 is of an inclined type, the backstop 1 may include a holding frame 9, instead of the plurality of installation legs 6, for holding the backstop 1 in an inclined position.

[0045] The invention made by the inventor has been specifically explained above based on the embodiments, but it goes without saying that the invention is not limited to the embodiments already described, and various modifications are possible within the scope that does not deviate from the gist of the invention. [Explanation of symbols]

[0046] 1. Backstop 2. Bullet Speed ​​Reduction Layer 3. Bullet-Stopping Layer 4. Collection space 5 Retaining Frame 5a Top plate 5b Bottom plate 5d outlet 6 Installation legs 7 Elastomer layer 7a Rubber layer 7b Thermoplastic elastomer layer 8 Elastomer Tip 9 Retaining Frame b. Bullet

Claims

1. a bullet velocity reduction layer that reduces the bullet velocity by penetrating the bullet; a bullet stopping layer that repels and catches a bullet that has penetrated the bullet velocity reduction layer without allowing the bullet to penetrate the bullet velocity reduction layer; Including, The bullet velocity reduction layer and the bullet stopping layer are spaced apart from each other. Backstop.

2. 2. The backstop of claim 1, The bullet velocity reduction layer is configured by sandwiching a bullet velocity reduction material between a pair of elastomer layers. Backstop.

3. 3. The backstop of claim 2, At least one of the pair of elastomer layers is a rubber layer, a thermoplastic elastomer layer, or a multi-layer structure including these, The bullet velocity reduction material is rubber chips, thermoplastic elastomer chips, sand, or a mixture containing these. Backstop.

4. 4. The backstop of claim 3, At least one of the pair of elastomer layers has a two-layer structure including a rubber layer and a thermoplastic elastomer layer, The thermoplastic elastomer layer is disposed only in the bullet impact area. Backstop.

5. 2. The backstop of claim 1, The bullet-stopping layer comprises a metal plate, a ceramic plate, or a plate made of a fiber-reinforced composite material; Backstop.

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