JPS60152898A - Guard plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a lightweight and strong bulletproof vest that protects the body from bullets, shell fragments, etc. and minimizes damage.
The present invention relates to a protective plate suitable for application to bulletproof shields, bulletproof helmets, armored vehicles, etc.

[Prior art]

The penetrating force of the bullet increases in proportion to MY2 (M: quality i, V: landing speed). In this case, in order to increase M, the caliber (bullet diameter) should normally be increased, and in order to increase ■, the firing speed should be increased. On the other hand, while a bullet reaches its target, it loses its V due to air resistance along its path, reducing its impact upon impact. For this reason, if the weight of a bullet is the same, it is more advantageous to make it smaller in diameter and longer in length. Note that the power of a bullet is generally expressed by bullet specific energy (value MV /B obtained by dividing the bullet energy product by its diameter area S), and the larger this value is, the higher the power is.

By the way, at the moment the bullet hits the protective plate, the aforementioned bullet energy is concentrated at the apex of the tip cone of the bullet, and penetration begins from this point. Here, the hardness and strength of the protective plate are 1. The hardness and strength of the bullet are correlated, and they begin to fracture each other. If the object breaks and is prevented from penetrating, it will penetrate and cause serious damage to the body.

Therefore, the protective plate is required to have a hard surface and high internal strength, and in order to satisfy these requirements, conventionally, a high-strength steel plate, which has been surface-hardened, has been used. However, steel plates are heavy, and when used in bulletproof vests, etc., they are too heavy and difficult to move, which has the disadvantage of having a fundamental negative impact on the human body, vehicle bodies, etc.

Therefore, recently, various protection plates using ceramics, high-strength fiber fabrics, etc. have been proposed. Among these, ceramics in particular are attracting attention as new materials because they are lightweight, have high hardness, and high strength. However, it is technically difficult to manufacture thick, large-sized ceramics with high quality.
It is also economically disadvantageous. On the other hand, ceramics are generally difficult to machine, and there are problems in using them as structural members for car bodies and airframes, like conventional metal protection plates.

Therefore, for example, as shown in Fig. 1, a laminated plate consisting of a ceramic plate 1 and a steel plate 2 can be considered, but in that case, when the bullet hits the ceramic plate 1, the entire surface of the plate is fractured, so the plane direction The resistance strength is not the same depending on the point where the bullet hits, and the peripheral portion tends to be weaker than the central portion, and as a result, the protective plate as a whole lacks bullet-blocking properties.

If you are simply using the ceramic plate alone, the second
As shown in the figure, it is sufficient to reinforce the peripheral edge of the ceramic plate 10 with a frame 4 having a substantially U-shaped cross section, but in that case, the bullet stopping properties of the ceramic plate 1 alone are low, and the wall thickness must be increased. Attempts to increase the bullet-stopping properties by increasing the thickness are unsatisfactory due to production technology problems and significant cost increases.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a protective plate that is lightweight, has high hardness and strength, has excellent resistance, and can completely protect the body from bullets and the like. be.

Therefore, the first object of the present invention is to comprise a ceramic plate and a back plate disposed on the back side of the ceramic plate, and the back plate is made of fiber-reinforced glass reinforced with aromatic polyamide fibers. The purpose of the present invention is to provide a protective plate formed by the present invention.

A second object of the present invention is to provide a protective plate that is composed of a ceramic plate and a back plate disposed on the back side of the ceramic plate, and in which the peripheral edge of the plate is reinforced with a reinforcing member. .

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIGS. 3(a) and 3(b) are a front view and a sectional view of a protection plate showing a first embodiment of the present invention. In the same figure, 1
1 is a ceramic plate, 12 is a back plate of the ceramic plate 11, and these plates form a protection plate 10. In this case, is the back plate 12 the entire upper 2 mix plate 11? Although an embodiment in which the cover is covered is shown, it may be arranged only on the & surface.

The ceramic plate 11 has a required hardness.

Alumina, silicon nitride, silicon carbide, etc., which have strength, are used. Moreover, for example, the ceramic plate 11 is 10crn
A method of arranging a plurality of protective plates 10 made of such ceramic plates 11 in a rectangular shape of x 10 cm and about 3 W in thickness to form a protective plate having a wide area is shown in FIG. 4(a). The protective plates 10 in adjacent rows may be arranged vertically and horizontally as shown in (b), or in a hexagonal shape as shown in (c). They may be formed and arranged. As described above, the shape of the protection plate 10 itself is not specified at all, and various changes can be made, and an arrangement configuration suitable for the shape may be adopted.

The back plate 12 is made of fiber-reinforced plastic (FRP) whose reinforcing fibers are Kep 2 (registered trademark of DuBoy) woven fabric, which is an aromatic polyamide fiber. In that case,
The Kepra woven fabric is directly wrapped around the ceramic plate 11 in multiple layers lengthwise and horizontally to completely cover the plate 11, impregnated with a thermosetting resin as a matrix, and then heated by pressing with a hot press or the like. The protective plate 10 is obtained by curing the curable resin.

According to the protection plate 10 having such a structure, it is significantly lighter and stronger than the conventional counterintelligence plate made of steel plate, and even though it is a composite material, the ceramic plate 11 is wrapped and surrounded by the back plate 12 made of FRP. Because of its structure, there is no need for mechanical bonding, and FRP itself has high strength.
Moreover, since the entire ceramic plate 11 is covered, the peripheral edge of the ceramic plate 110 can be reinforced, and the crushing of the ceramic plate 11 can be kept to a minimum. Furthermore, the strength of the entire protection plate 10 can be increased.

Therefore, penetration of bullets etc. is effectively prevented. In addition, since it is lightweight, it is easy to move when used in bulletproof vests, and easy to carry when used in bulletproof shields.

Note that it is desirable that the back plate 12 has a strength particularly greater than that of the ceramic plate 11 among the required hardness and strength of 9.

In addition, when a protective plate that targets powerful bullets is required as firearms become more sophisticated, ceramic plates 1
1 or the back plate 12 may be made thicker.

FIGS. 5(a) and 5(b) are a front view and a sectional view showing a second embodiment of the present invention. In this embodiment, a protection plate 20 is constructed of a ceramic plate 11, a back plate 14, and a frame 15 having a substantially U-shaped cross section that protects the peripheral edge of the ceramic plate 11.

The back plate 14 is made of a material that is lightweight, has high strength, and is easy to machine, such as high-strength aluminum alloy, magnesium alloy,
Fiber-reinforced plastic (FRP), fiber-reinforced metal (FR)
M) or the like may be used, and may be joined to the back surface of the ceramic plate 11 by adhesion or fastening means such as rivets and bolts.

The frame body 15 is for reinforcing the peripheral edge of the ceramic plate 110 to improve resistance, and is made of the same material as the ceramic plate 14 or a material having the same strength. By protecting the ceramic plate 11 with such a frame 15, even if a bullet hits the peripheral edge 9 of the ceramic plate 110, the fracture of the plate 11 can be minimized, and penetration of the bullet can be prevented. The body 15 can prevent fragments of the ceramic plate 11 from scattering.

FIG. 6 is a sectional view showing a third example of the present invention, in which the back plate 1
A substantially hook-shaped bent portion 21 is integrally provided on the peripheral edge of the ceramic plate 11 over the entire circumference, and the bent portion 21 protects the peripheral edge of the ceramic plate 11. It has a function as a body 15.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention. In this embodiment, a ceramic plate 11 and a back plate 23 made of a metal material such as a high-tensile aluminum alloy or a magnesium alloy are integrally formed, and the ceramic plate 11 is buried inside the back plate 23. the whole first
It is protected in the same way as the example.

Since the ceramic plate 11 is a brittle material, the second
．． If the surface is exposed to the outside as in the third embodiment, there is a risk of damaging the surface during normal use, but as in the present embodiment (the same applies to the first embodiment), the entire surface is completely covered with the back plate 23. There is no need to worry about damage.

In addition, the overall moment of inertia of area is increased, and the ceramic plate 11 is reinforced, so resistance resistance can be improved.

In this embodiment, the ceramic plate 11 and the back plate 23 are integrally formed as described above, but the present invention is not limited to this. For example, as in the fifth embodiment shown in FIG. 8, the surface of the ceramic plate 11 may be covered and protected. It goes without saying that the front plate 30 may be manufactured separately from the back plate 23, and the two sets of the front plate 30° ceramic plate 11 and the back plate 23 may be integrally joined by rivets 31, welding, etc. be. In that case, it is desirable that the front plate 30 be made of the same material as the back plate 23, but this is not a limitation. In the fifth embodiment, a spacer 33 is interposed, and the spacer 33 and the peripheral edges of the front plate 30 and the back plate 230 serve as a frame for reinforcing the peripheral edge of the ceramic plate 110. Note that if a frame-shaped protrusion surrounding the ceramic plate 11 is integrally provided on the peripheral edge of the front surface of the back plate 230 or the peripheral edge of the back surface of the front plate 30, the spacer 33 described above can be omitted.

FIG. 9 shows a sixth embodiment of the present invention, in which two ceramic plates 11A and 11B, front and rear, are arranged closely together when it is necessary to increase the thickness of the ceramic plate. In this case, it is preferable to use a high-hardness ceramic plate 11A on the front side and a high-strength ceramic plate 11B on the back side.

Note that the configuration of other parts is the same as that of the fifth embodiment shown in FIG. 8, so the explanation will be omitted, but with this configuration, the back plate 23 and the front plate 30 can be made thinner to reduce weight. However, if the thickness of the plate is not changed, it will have better resistance, so it is possible to provide a protective plate that can sufficiently withstand powerful bullets.

FIG. 10 shows a seventh embodiment, in which a reinforcing plate 40 is added to the sixth embodiment, and two ceramic plates 11A,
11B. Therefore, the spacer 33 includes a first spacer 33A interposed between the front plate 30 and the reinforcing plate 40, and a second spacer 33B interposed between the reinforcing plate 40 and the back plate 23. Also,
It is preferable that the reinforcing plate 40 is made of the same material as the back plate 23, so that the rear ceramic plate 11B can be prevented from being crushed by a bullet with a small force, thereby enabling reuse.

It should be noted that the present invention is not limited to the above-mentioned embodiments in any way, and any combination of these embodiments or any other modifications may be made without departing from the gist of the present invention.

〔Effect of the invention〕

As explained above, the protective plate according to the present invention consists of a ceramic plate and a back plate, and since the back plate is made of fiber-reinforced plastic reinforced with aromatic polyamide fibers, it is made of a conventional steel plate. It is significantly lighter than other products and has high hardness.

Since high strength is obtained, the body can be safely protected from fragments of bullets and shells. In addition, since it is lightweight, it is light and easy to move when used in bulletproof vests and the like.

Furthermore, in addition to the ceramic plate and the back plate, the present invention includes a reinforcing member for reinforcing the peripheral edge of the ceramic plate and the back plate.
The resistance increases, and the bullet stopping performance can be further improved. Note that by covering the ceramic plate with the back plate, the strength of the entire protective plate can be further increased.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are sectional views of a conventional example and a protective plate that is the premise of the present invention, respectively, and FIG. 3 (a). (b) is a front view and a cross-sectional view showing the first embodiment of the present invention, FIG. a), (b), Figures 6 and 7. 8, 9, and 10 are the second embodiments of the present invention, respectively.
．． Third. 4th. Fifth. It is a figure which shows the 6th and 7th Example. 10...protective plate, 11, 11A, 11B...
...Ceramics plate, 12.Fist...Back plate, 14...
・Back plate, 15...frame body (reinforcing member), 20...
・Protective plate, 23... Rear plate, 30... Surface plate,
33...Spacer.

Claims (4)

[Claims] (1) Consisting of a ceramic plate and a back plate disposed on the back side of the ceramic plate, the back plate is reinforced with aromatic polyamide fibers, impregnated with thermosetting resin as a matrix, and A protective plate characterized by being made of fiber-reinforced plastic that is cured under heat and pressure. (2) A protective plate comprising a ceramic plate and a back plate disposed on the back side of the ceramic plate, the peripheral edge of which is reinforced with a reinforcing member. (3) The protective plate according to claim 2, wherein the reinforcing member is formed integrally with the back plate. (4) The protective plate according to claim 2, wherein the reinforcing member is formed separately from the back plate.