JPH048930Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shinai (shinai), and particularly relates to a shinai in which the wariko that constitutes the shinai is made of a composite material.

As the name suggests, shinai are usually made of bamboo.
It is made up of bundles of book warizi. However, shinai made of bamboo materials have low durability against severe repeated impact forces, and tend to tear or break during use. The dangers of bamboo shinai have been pointed out, as they have been linked to blindness and death.

In order to eliminate this danger of bamboo shinai, we have developed shinai made from materials other than bamboo (for example, metals such as aluminum) and shinai made from composite materials (for example, composite materials of metal and plastic). Various types have been developed. However, although these shinai are excellent in terms of safety, the reality is that they are hardly ever used in reality. The biggest reason for this was that these shinai became extremely heavy, making it impossible for competitors to perform the same nimble and nimble movements as with traditional bamboo shinai. In other words, this is because the specific gravity of metals, plastics, etc. used to achieve safety is considerably higher than that of bamboo. However, this poses the difficulty of significantly reducing the strength of the shinai.

Therefore, in order to avoid simply making the composite material thinner and lighter, the present invention aims to change the wariko of the shinai to an annular cross-sectional shape that can withstand bending loads and has bending rigidity comparable to that of natural bamboo. By comprising an enclosing body and a core body surrounded by the enclosing body, which is responsible for reducing the weight of the splitter and preventing deformation of the enclosing body,
This aims to simultaneously make the Shinai lighter and stronger.

Furthermore, it is preferable to surround the enclosure with a protector to prevent the enclosure from cracking or tearing due to impact.

The Shinai wariko of the present invention has an annular shell structure in which the surrounding body (and protective body) is made of fiber-reinforced plastic, so it can significantly improve the bending rigidity against impact forces despite its light weight. be.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure 1 shows the schematic structure of a Shinai shinai 1. Normally, a Shinai is composed of four warikos 2, each of which has a wider width W 1 at the center, a wider width W ₁ at the center, and a wider width at the tip and The width at hand W ₂ is narrower. The shinai of the present invention particularly relates to the wariko that constitutes the shinai.

FIG. 2 shows various structures of the splitter according to the present invention, each of which includes a core body A, a surrounding body B surrounding the core body A, and a protective body further surrounding the surrounding body B. The basic configuration consists of C. Of these, Fig. 2a shows a case in which the core body A is made of lightweight material _a1 only, and Fig. 2b shows a case in which the core body A consists of lightweight material _a1 and hollow part _a2 ;
In Fig. c, the core body A is made of a lightweight material _a1 having a channel-like cross-sectional shape, and the channel portion of this lightweight material _a1 forms a hollow part _a2 .
In the one shown in Figure a, a part of the protector C (a part corresponding to the back surface of the splitter) is shown open. This opening can also be filled with any lightweight material. As shown in the embodiment shown in Fig. 2d, by leaving both end edges of the protector C open so that they do not come into contact with each other, it is possible to contribute to reducing the weight without reducing the strength of the splitter. The effect is even greater, and this can also be applied to the embodiments of FIGS. 2b and 2c.

As described above, the bamboo sword wariko of the present invention is composed of a core A containing at least a lightweight material _a1 , and a surrounding body B surrounding the core A, and further includes, if necessary,
Protective body C to prevent cracking and tearing of the surrounding body B
may be placed around enclosure B.

As the lightweight material _a1 , foamed plastic, lightweight wood, etc. can be used, but a molded body of resin or lightweight metal having a honeycomb structure as shown in FIG. 3 can also be used. Since the enclosing body B is mainly intended to improve the bending rigidity of the splitter, it is preferable to use sheet-like or cross-like plastic (FRP) reinforced with glass fibers, carbon fibers, or the like.
The protector C can be made of a material that can withstand the impact loads to which the shinai is subjected, such as a sheet of plastic, rubber, or leather.

The shinai wariko of the present invention has a shell-like structure with the surrounding body B and the protector C, so it is possible to make a shinai that is lightweight and has excellent impact resistance, especially in areas where the wariko is easily damaged. (Shoulder section indicated by numeral 3 in Figure 2a and side section indicated by numeral 4) can be sufficiently protected.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the schematic structure of a shinai. FIG. 2 is a cross-sectional view showing various structures of the splitter of the bamboo sword of the present invention. FIG. 3 is a perspective view of a honeycomb structure that can be used as a lightweight material for the splitter of the bamboo sword of the present invention. 1... Shinai, 2... Wariko, A... Core body, B...
Enclosing body, C...Protective body, _a1 ...Lightweight material, _a2 ...Hollow part.

Claims (1)

[Claims for Utility Model Registration] The wariko constituting the shinai is made of a composite material including at least an enclosure made of fiber reinforced plastic (FRP), the enclosure has an annular cross-sectional shape, and the A wariko for a bamboo sword, characterized in that a core body containing at least a lightweight material is provided in a region surrounded by an annular enclosure body.