JPH0467476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite shinai (shinai) wariko made of various materials.

As the name suggests, shinai are made from natural bamboo material, but the drawback of bamboo shinai is that they are particularly weak against impact. For this reason, after a certain amount of use, hangnails, cracks, splits, etc. may occur on the warizi.
In some cases, breakage has caused bodily injury accidents.

In order to solve these problems, Shinai wariko made of various composite materials have been developed, and some of the composite Shinai are not nearly satisfactory in terms of durability. be. Unfortunately, however, the reality is that even such composite shinai are rarely used in practice.
The reason for this is that, from the perspective of improving durability, the shinai is formed into a cylindrical shape like a baseball bat, so the actual feeling of use is different from that of traditional bamboo shinai; Even though it is composed of four warizi like a traditional shinai, the weight of the shinai as a whole is significantly heavier than a bamboo shinai, so the actual feel of using it is different from that of a bamboo shinai. are different.

Even if it is a composite shinai, in order to make it comparable to a bamboo shinai in terms of the feeling of use, the shinai should not be made into a cylindrical shape like a baseball bat, but it should be shaped like a regular bamboo shinai. must be made up of warizi. However, a problem when constructing a composite shinai as a shinai made of wariko is that it is extremely difficult to satisfy both durability and lightness at the same time. For this reason, what is known as a composite shinai consisting of wariko,
All of them were insufficient in terms of durability and/or light weight.

Therefore, the present inventor has developed a composite shinai consisting of warikos, which is excellent in durability and light weight. We have developed a splitter consisting of two reinforcing members, a lightweight material provided between the reinforcing members, and a surface material placed outside the reinforcing members. However, in the process of repeatedly conducting durability tests on the splitter, it was discovered that the bond between the reinforcing member and the lightweight material could peel off due to severe impact force. This is because the adhesion between wood or foam used as lightweight materials and reinforcing members (thin sheets of fiber-reinforced plastic such as carbon fiber or glass fiber) tends to be so-called small point adhesion. This is because complete adhesion may not be obtained. If the adhesive between the lightweight material and the reinforcing member breaks off, the bending rigidity of the entire splitter will drop significantly.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a wariko for a composite shinai in which the adhesive between a reinforcing member and a lightweight material placed between the reinforcing members does not come apart.

This purpose is that the wariko that constitutes the shinai is formed of a composite material including at least a lightweight core and a sheet-like reinforcing member provided adjacent to the outside of the lightweight core, and has sheet-like ribs that are substantially parallel to its cross section and are arranged at a plurality of locations in the longitudinal direction of the splitter, and the surfaces of the sheet-like ribs are in contact with the lightweight core. This is achieved by

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

FIG. 1 shows a schematic configuration of a conventional bamboo shinai 10. Normally, the shinai 10 has four warikos 12.
It consists of

FIG. 2 shows various cross-sectional structures of the splitter 12' of the composite shinai of the present invention. Warizhi 1 of the present invention
2' has at least two sheet-like reinforcing members 14 arranged at intervals along the longitudinal direction of the splitter 12'. The embodiment shown in FIG. 2a is
A total of four reinforcing members 14 are arranged on the upper and lower sides, and on the left and right, and these are arranged in a box shape. In the embodiment shown in FIG. In the embodiment shown in FIG. 2c, a total of two reinforcing members 1 are arranged at the top and bottom.
4 is arranged. The reinforcing member 14 is
Most preferably, carbon fiber or glass fiber reinforced plastics (FRP) are used.
In some cases, a thin sheet of lightweight metal such as aluminum may be used. A lightweight core body or lightweight material 20 is provided between the reinforcing members 14. The lightweight material 20 is most preferably made of lightweight wood, but low-density foam of plastic may also be used. When using lightweight wood, arrange the wood fibers so that they extend in the width direction of the splitter 12' (in the left-right direction in Figure 3), and in the direction in which the strongest impact pressure is applied (in the lateral direction of the splitter). It is better to increase the impact resistance of the material. Surface materials 16a, 16b, and 16c are provided on the outside of the reinforcing member. The surface material 16a functions as a surface protection material that protects the surface of the wart, and the surface material 16b functions as a side surface protection material that protects the side surface of the wart. Since these surface materials 16a and 16b directly receive the impact load from the opponent's shinai, it is preferable to use plastic with particularly excellent impact resistance.

FIG. 3 is a longitudinal cross-sectional view of the splitter 12' of the present invention, and the feature of the splitter 12' of the present invention is that the lightweight core body, that is, the lightweight material 20, has a surface substantially parallel to its cross section; It has a sheet-like rib 22 arranged at a plurality of locations in the longitudinal direction of the splitter 12', and the surface of the sheet material rib 22 is in contact with the lightweight material 20. The ribs 22 are provided at appropriate intervals as shown in Fig. 3, but they do not necessarily need to be provided over the entire length of the wariko 12', and are susceptible to impact from the opponent's shinai. It may be provided only in a region where the frequency is particularly high, that is, a region of a certain length l near the tip of the splitter 12'. As the material of the ribs 22, it is preferable to use a material that has excellent adhesiveness with the reinforcing member 14.
When using a plastic foam or rubber sheet, it is preferable to use a plastic foam or a rubber sheet.

The lightweight material 20 and the reinforcing member 14 are bonded with adhesive, and the most desirable wood is used as the lightweight material 20, and the wood fibers thereof are arranged so as to extend in the width direction of the splitter 12'. At this time, the end of the butt comes into contact with the surface of the reinforcing member 14.
In such a case, since there are irregularities on the butt end, the bonding state becomes a point bonding state, and the bonding force becomes weak. Further, even when a foam is used as the lightweight material 20, it will be in a point bonded state, and the adhesive force with the reinforcing member 14 will be weak.

Therefore, like the splitter 12' of the present invention, the rib 2
2 is stretched between the reinforcing member 14 and both ends of the rib 22 are bonded to the reinforcing member 14, so that when a strong impact force is applied, the lightweight material 20 and the reinforcing member 14
It is possible to prevent the situation where the material peels off.

Furthermore, by bonding the contact surfaces between the ribs 22 and the lightweight material 20, the lightweight material 20 can be integrated in the longitudinal direction of the splitter 12', making it possible to increase the bending rigidity of the splitter 12'. . This is particularly effective when wood is used as the lightweight material 20 and the extending direction of the wood fibers is arranged in the width direction of the splitter.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the general structure of a conventional bamboo shinai. FIG. 2 is a cross-sectional view showing various configurations of the splitter of the bamboo sword of the present invention. FIG. 3 is a longitudinal cross-sectional view of the splitter of the bamboo sword of the present invention taken along the line - in FIG. 2a. 14...Reinforcement member, 20...Lightweight material, 22...
rib.

Claims (1)

[Scope of Claims] 1. The wariko constituting the Shinai is made of a composite material including at least a lightweight core and a sheet-like reinforcing member provided adjacent to the outside of the lightweight core, and The lightweight core has sheet-like ribs that are substantially parallel to the cross section thereof and are arranged at a plurality of locations in the longitudinal direction of the splitter, and the surface of the sheet-like ribs is parallel to the light-weight core. A shinai wariko characterized by the fact that it is in contact with the shinai.