JPH02172480A - Protector for sport - Google Patents

Abstract

PURPOSE:To realize not only a light weight, a strong antishock strength, and a highly easy usage, but also to prevent a deterioration of water absorption, a deformation, a corrosion, and the like, even though it is used for a long time, by laminating fiber-reinforced plastics to the front and the rear sides of a light weight core material. CONSTITUTION:A glass fiber felt to which an epoxy resin is impregnated and hardened, for example, as a light weight core material, a carbon fiber prepreg and a glass fiber prepreg to which an unsaturated polyester resin is impregnated as a prepreg to form a fiber-reinforced plastics layer, and a polyethylene film as a film to form a layer of a soft membrane, are prepared, and placing the glass fiber felt at the center, the film, the glass fiber prepreg, and the carbon fiber prepreg are laminated on the upper and the lower sides of the glass fiber felt symmetrically, and by heating under a pressure at 100 deg.C for about one hour, an integrated laminate structure of plastron body for fencing can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention provides protective gear 1 for use in various sports, for example.

The present invention relates to protective gear used in martial arts such as kendo and karate, and protective gear used in ball games such as American football, ice hockey, and baseball, and particularly to sports protective gear suitable for use as a net stand in kendo.

[Conventional technology]

Traditionally, various types of sports protective gear have been used.

There are many different materials such as natural materials and plastics. To explain this using a kendo stand as an example, a kendo stand is generally made of bamboo, leather, or the like. The structure of the bamboo stand is
Bamboos of 20 to 300 diameters are lined up in one direction, and the surface is further covered with leather. However, although this bamboo stand has sufficient strength in one direction, it lacks strength in other directions5.For this reason, when an impact is applied with a shinai, it easily bends and a direct impact is applied to the stand. It hurts when I get hit. Also.

Even during storage, it can easily break if excessive force is applied in the left and right directions.

On the other hand, due to repeated impact on the leather net stand.

There are problems with durability as dents or peeling of the skin occur.

In addition, since natural materials such as bamboo and leather easily absorb moisture, surface painting has not been sufficiently studied until now. At present, there is no such thing, and scratches and peeling tend to occur on one surface due to repeated impacts from the Shinai.

In addition to natural materials such as bamboo and leather, kendo shododai made of plastic have also been proposed. For example, a Kendo body made of ABS resin (see Japanese Utility Model Publication No. 45-32821)
, Sports armor made by hardening a material made by impregnating a flexible cloth with an adhesive resin (see Japanese Patent Application Laid-Open No. 60-66770 No. 1) 9 Glass fibers embedded in polyester resin on one side of a synthetic resin material Kendo wraparound trunk formed by laminating reinforcing layers (Utility Model Publication No. 41571/1983, JP-A-60/1983)
122583) etc. have been proposed.

[Problem to be solved by the invention]

However, the conventional kendo wraparound trunk made of plastic has an impact resistance of 1.
It lacks strength, hardness, etc., but on the contrary, it lacks the necessary impact resistance.

When strength, hardness, etc. are added, the weight increases, making it unusable, and for this reason, it is not generally used at present.

In order to eliminate these problems, the inventors of the present invention investigated two different methods, and found that by reinforcing both sides of the lightweight core material with fiber-reinforced plastic, it was possible to achieve impact resistance of 1 strength, while being extremely lightweight. The inventors have discovered that a material with excellent hardness can be obtained and that this material can be suitably used for kendo circumdodai and other sports protective gear, and have thus arrived at the present invention.

(Means for Solving the Problems) That is, one aspect of the present invention is a sports protective equipment characterized in that fiber-reinforced plastics are laminated and integrated on both the front and back surfaces of a lightweight core material.

Here, between the lightweight core material and the fiber-reinforced plastic, when the lightweight core material has a laminated structure, the interlayer 8 When the reinforced plastic has an H1 layer structure, the interlayer ring, between any layer,
It is recommended to integrate with a soft thin film layer.

Furthermore, it is recommended to use a plastic material containing micro hollow bodies as the lightweight core material.

Below, the configuration of the present invention will be explained in more detail.

In the present invention, the lightweight core material has the function of reducing the weight of the entire armor, improving operability, and preventing distortion of the reinforcing material, ie, the fiber reinforced plastic, in response to impact from the surface of the armor. For this reason, as a lightweight core material.

The material used is one that is as light as or more lightweight than conventional bamboo or leather, and that does not easily dent.

Specific examples of lightweight core materials include honeycombs made of aluminum, aramid, etc., glass fiber, and carbon fiber.

Examples include felt made by impregnating aramid fiber or the like with a resin and curing it, a syntactic core made of a plastic material containing microscopic hollow bodies, and wood 2 foam. Among these, syntactic cores are preferred because they are excellent in lightness, strength, productivity, etc. These core materials may be used alone or in a layered manner.

In addition, when laminating, the same kind of materials may be laminated, or different materials may be laminated.

In one armor, the entire lightweight core material does not necessarily have to be made of the same material (the material of the lightweight core material may be changed depending on the place of use.

The plastic matrix constituting the syntactic core used in the lightweight core material may be either thermosetting or thermoplastic plastic, but thermosetting plastic is preferred from the viewpoint of strength. Micro hollow bodies include carbon balloons, silica balloons, and silica balloons with diameters of several microns to hundreds of microns.
Microballoons such as plastic balloons are used. in a plastic matrix.

Further reinforcement can be achieved by mixing single crystal fibers such as silicon carbide whiskers or short carbon fibers with the micro hollow bodies.

Matrix resins used in fiber-reinforced plastics that reinforce both the front and back surfaces of the lightweight core material include 2. For example, epoxy resins, phenol resins, unsaturated polyester resins, 5. thermosetting resins such as polyimide resins, furan resins, etc.

Nylon, polycarbonate, polysulfone, polyethersulfono. Polyethylene, polypropylene.

Examples include thermoplastic resins such as ABS resin and acrylic resin, and preferably thermosetting resins such as epoxy resin. Examples of reinforcing fibers include carbon fibers, glass fibers, aramid fibers, and the like.

Carbon fibers and aramid fibers are preferred because they are lightweight and have excellent strength.Reinforcing fibers are not limited to the same type, and different types of fibers may be used in combination.Fiber-reinforced plastics are
One layer may be provided on each side of the lightweight core material.

Furthermore, a plurality of layers may be formed on each surface.

Any known method may be used to form reinforcing fiber-reinforced plastic layers on both sides of the lightweight core material.

Among them, 5 types of unidirectional arrays of fibers (UD), W,! li
cloth.

It is preferable to use a prepreg made by impregnating a fiber aggregate such as a mat with a thermosetting resin. This prepreg is laminated directly on the surface of a lightweight core material or with an adhesive, a soft film, etc. By heating.

A high-strength, high-hardness fiber-reinforced plastic layer bonded to a lightweight core material can be easily formed.

As described above, in the armor of the present invention, there is an arbitrary space between the lightweight core material and the fiber-reinforced plastic, between the layers when the lightweight core material has a laminated structure, and between the layers when the fiber-reinforced plastic has a laminated structure. It is preferable to interpose a layer of soft thin film between the layers to integrate the layers. It has the effect of preventing layer destruction, improving the impact strength of armor, and damping vibration and sound.

Examples of materials forming the soft thin film layer include flexible materials 1, such as Fit films made of natural rubber, synthetic rubber, polyurethane rubber, or foamed thin films thereof, vinyl chloride, ethylene-vinyl acetate copolymer, polyethylene, Examples include flexible plastics such as nylon 1181 or foamed thin films thereof, and woven or nonwoven fabrics made of nylon fibers. The thickness is preferably in the range of O,OS to 3.0 l (more preferably in the range of 0.1 to l, Q+n).

If necessary, a film or paint may be applied to the front and back surfaces of the armor of the present invention.

The manufacturing method for the sports armor having the above structure may be selected as appropriate depending on the characteristics of the materials of each layer composing the armor.
For example, a method in which a lightweight core material is formed into a predetermined shape in advance and a soft thin film layer and a fiber reinforced plastic layer are formed on both sides of the core material, and a method in which a soft thin film layer and a fiber reinforced plastic layer are formed on both sides of a flat material before the lightweight core material is formed. A method may be adopted in which the material before forming the layer and the fiber-reinforced plastic layer is laminated, the whole is set in a mold of a predetermined shape, and heated under pressure to form the final shape.

Examples of uses of the protective gear of the present invention include kendo stands, ice hockey, American football protectors, helmets, etc., and it is particularly suitable for kendo stands.

[Effect]

The sports protective gear of the present invention having the above structure has a structure in which fiber-reinforced plastic is placed on both the front and back sides of the lightweight core material, so it has high rigidity and high impact strength despite its light weight.Therefore, one aspect of the present invention When applied to a kendo stand, it is lightweight and extremely easy to use, and even when hit with a bamboo sword, local deformation does not occur, so there is less impact on the body, so you do not feel much pain, and it can be used for a long time. However, traditional bamboo kendo stands do not deform or corrode.

If it absorbs moisture and is used for a long time, it will become deformed, and a leather kendo stand will become brittle and corrode due to moisture absorption, but the kendo stand according to the present invention does not have this problem at all.

Furthermore, the soft thin film layers interposed between the lightweight core material and the fiber-reinforced plastic, between the layers within the lightweight core material, and between the layers within the fiber-reinforced plastic prevent the adhesive surfaces of each layer from peeling off and reduce the impact that may be exerted on the armor. It has the effect of mitigating the impact, preventing destruction of the fiber-reinforced plastic layer, improving the impact resistance of armor, and damping vibrations, sounds, etc.

Therefore, the life of the armor can be further extended.

When a protective gear with a layer of soft thin film is applied to a kendo stand.

Not only does it reduce the impact on the person being struck when striking a shinai with a shinai, but it also reduces the impact on the hand holding the shinai. This is preferable since it is similar to the case of the bamboo union described above.

[Example] An example of the sports protective gear of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a kendo stand, where 1 is a kendo stand formed into a predetermined shape. This Kendo stand is as shown in Figure 2.

It has a laminated structure in which fiber-reinforced plastic layers 4, 4 are bonded to both sides of a central lightweight core material 2 via soft thin film layers 3.3. FIG. 3 shows a modification of the laminated structure constituting the kendo stand 1. In the laminated structure shown in FIG. 3, two layers of lightweight core materials 2A and 2B are joined via a soft thin film layer 3, and soft thin film layers 3 and 3 are bonded to the outside of the lightweight core materials 2A and 2B. Two fiber-reinforced plastic layers 4A and 4B are laminated, respectively, and the whole is made into a stock. FIG. 4 shows yet another modification of the laminated structure constituting the kendo net stand l. The laminated structure shown in FIG. 4 consists of layers 3 of soft thin films on both sides of a central lightweight core material 2. Woven fibrous plastic layer 4A, soft thin film layer 3. Woven fiber plastic Jii4B is laminated and the whole 6 is integrated. The laminated structures shown in FIGS. 2 to 4 all have characteristics suitable for a kendo net stand l. Fig. 5 shows an enlarged example of the materials constituting the lightweight core materials 2, 2A, and 2B in the laminated structure shown in Figs. This is a large number of microscopic hollow bodies.

Next, a specific embodiment of the present invention will be described.

Example! As a lightweight core material, glass fiber felt impregnated with epoxy resin and cured (approx. Prepare a polyethylene film (approximately 0.3 inch thick) and glass fiber prepreg (about 1 inch thick) as a film to form a soft thin film layer, and place the glass fiber felt on top and bottom of the prepreg (about 1 inch thick). By symmetrically laminating film, glass fiber prepreg, and carbon fiber prepreg and heating under pressure at 100°C for 1 hour, a kendo net stand (approximately 8 mm thick) with a laminated structure was made. Obtained.

The weight of this kendo net stand was approximately 800 g, which was lighter than conventional bamboo net stands that weighed 900 to 1000 g.

Next, this kendo net stand was placed in an impact tester and hit continuously at a speed of 40 km/h with a stick rod (1 m long, 24 cranes in diameter, 1 weight 640 g). After being hit about 15,000 times.

A visual inspection revealed no abnormalities.

As a comparative example, a conventional bamboo stand was tested using the same impact testing machine, and after about 4,000 cycles the surface skin and bamboo began to peel or become misaligned, and broke after about 7,600 cycles. Therefore, the life of the kendo net stand of this embodiment is extremely long compared to the conventional one made of bamboo.

Furthermore, when the kendo net stand of this example was worn on the body and struck with a bamboo sword, the sound was similar to that of a bamboo yodai, and the kendo net stand was worn at the time. The shock applied to people was smaller and less painful than when made of bamboo.

In this way, the kendo net stand of the nine embodiments is lighter than the conventional one made of bamboo, and can be used without any discomfort.
Moreover, it had the effect of having a long life.

Example 2 A net stand for kendo was made by omitting only the film forming the soft thin film layer in Example i and keeping the other conditions the same as in Example I. This table also had excellent lifespan and light weight as in Example (2).

In addition, when this kendo net stand was worn on the body and struck with a bamboo sword, two hands felt more hit than in Example (2), and a high-pitched metallic sound was emitted, which was slightly different from the normal one (9). .

Example ■ Syntactic core (manufactured by Heitzl Co., Ltd.) made by mixing glass balloons in epoxy resin as a lightweight core material.

Carbon fiber prepreg impregnated with epoxy resin (manufactured by Nippon Steel Chemical Co., Ltd., thickness approximately 0.3 m1) and aramid fiber prepreg were used as prepregs for forming the fiber-reinforced plastic layer. (manufactured by DuPont, product name Kevlar, thickness approximately 0.1 sn),
Furthermore, as a film forming the soft III membrane layer, EV
A (ethylene-vinyl acetate) film (thickness approximately 0°3
mm), prepare a film, aramid fiber prepreg, symmetrically above and below the syntactic core.

Laminated film and carbon fiber prepreg at 130℃
By heating under pressure for 90 minutes, a kendo net stand (thickness: approximately 80 mm) having a laminated structure as shown in FIG. 4 was obtained.

The weight of this kendo net stand was approximately 700 g, which was considerably lighter than the conventional one made of bamboo.

Further, when this kendo net stand was tested in the same manner using the impact tester used in Example (2), no abnormality was observed even after hitting it more than 15,000 times.

Furthermore, as a result of wearing test of this kendo net stand, there was no abnormality in the sound or impact when struck with a bamboo sword, and it was found to be easy to use as in Example 1.

〔Effect of the invention〕

As explained above, the sports protective equipment of the present invention is.

It is lightweight and has strong impact strength, and is not only very easy to use, but also has the advantage of long life without water absorption deterioration, deformation, corrosion, etc. even when used for a long time.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing a kendo sadodai according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of a cross section of a laminated structure constituting the kendo sadodai, and Fig. 3 is a modification of the laminate structure. 4 is a sectional view showing another modification,
FIG. 5 is an enlarged sectional view of an example of a lightweight core material. ! -・-Kendo wraparound stand, 2.2A, 2B・・Lightweight core material, 3
Layer of soft membrane, 4.4A, 4B - fiber reinforced plastic layer, 5. - Brass tink material, 6-ak small hollow body. Agent Patent Attorney Kyo Matsu Sanga 4 Toga 5

Claims (3)

[Claims] (1) Sports armor characterized by a lightweight core material with fiber-reinforced plastic laminated and integrated on both the front and back sides. (2) The sports armor according to claim 1, characterized in that a layer of a soft thin film is interposed between arbitrary layers of the lightweight core material and/or the fiber-reinforced plastic. (3) The sports armor according to claim 1 or 2, wherein the lightweight core material has a portion made of a plastic material containing micro hollow bodies.