JPH0464715B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wariko of a bamboo sword (shinai), and in particular,
This invention relates to a splitter having excellent impact resistance in the height direction of the splitter.

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. As a result, hangnails, cracks, splits, etc. may occur on the wariko of the shinai during use.
In some cases, breakage has caused bodily injury accidents.

In order to solve these problems, Shinai warikos made of various composite materials have been developed. Some bamboo swords made of composite materials can almost solve the problem of durability against impact, but unfortunately they are hardly ever used. The biggest reason for this is that the weight of a shinai made from composite materials is much greater than that of a regular bamboo shinai, and the actual feeling of use is completely different from that of a bamboo shinai. be.

Therefore, there is a need for the development of a composite shinai that is lightweight and has impact resistance so that the feeling in actual use is almost the same as that of a natural bamboo shinai.

When practicing or competing in kendo with a shinai, each wariko of the shinai receives an impact load from the opponent's shinai on the surface of the wariko, and at the same time receives an impact load on the side of the wariko.

The shinai of the present invention particularly increases the strength against impact acting on the surface of the wariko.

That is, in order to increase the bending rigidity of the shinai, a box-shaped reinforcing member is provided, and at the same time, fibers are added to the area within the box-shaped reinforcing member so that the direction of the fibers extends in the height direction (vertical direction) of the wariko. By arranging the material, even when impact force is applied to the surface of the splitter, the reinforcing member remains in the vertical direction (height direction).
This prevents the steel from becoming distorted, thereby improving impact resistance.

Embodiments of the present invention will be described below based on the accompanying drawings.

In addition, "box shape" used in this invention
This term refers not only to shapes that form a complete closed rectangle as shown in the figure, but also to shapes that have slight gaps at any of the four corners or sides, and shapes that are slightly curved on any side. This also includes those with a shape that is

FIG. 1 is a perspective view of a shinai 10, and normally the shinai 10 is composed of four splits 12.

FIG. 2 is a cross-sectional view showing a schematic structure of the warp 12 of the bamboo sword of the present invention. A surface protection material 16, a side surface protection material 18, and a back surface material 20 are provided. The box-shaped reinforcing member has a substantially rectangular cross-sectional shape on both its inner and outer surfaces. In addition, a region 22 surrounded by the reinforcing member 14
is provided with a core made of a fibrous material having a configuration as described below. Although the surface protection material 16, side protection material 18, and back surface material 20 are not directly related to the present invention, various plastics, wood, rubber, etc. may be used as appropriate from the viewpoint of strength and lightness. can.

FIG. 3 shows a box-shaped reinforcing member 14, which is a feature of the present invention, and a core 2 provided in a region 22 (FIG. 2) surrounded by this reinforcing member 14.
6 shows various configuration examples. Reinforcement member 14
can be made from lightweight materials with excellent tensile strength, such as fiber-reinforced plastic (FRP) or lightweight metal sheets.
It is preferable to use FRP such as carbon fiber or glass fiber in terms of adhesion with 8 and 20 and ease of molding. The core body 26 is made of a fibrous material such as wood, bamboo, or FRP.

FIG. 3a shows a region 22 surrounded by the reinforcing member 14.
A core body 26 made of a fibrous material is present throughout the interior. The fibers 28 of the core body 26 extend in the height direction (vertical direction) of the splitter. Figure 3b is
A core body 26 of a fibrous material (for example, wood, bamboo, FRP, etc.) with fibers extending in the height direction of the splitter is present in a part of the region 22 surrounded by the reinforcing member 14,
At the same time, in another part of the region 22, there is shown an example in which a fibrous material or a material 30 other than the fibrous material exists, the fibers of which extend in a direction other than the height direction of the splitter. By using a lightweight material such as low-magnification foamed plastic as the material 30 other than the fibrous material, the adhesion to the box-shaped reinforcing member 14 can be improved, and the impact resistance of the surface of the splitter can be further improved. can be increased.

The box-shaped reinforcing member 14 is preferably provided over the entire length of the splitter 12 in the longitudinal direction in order to increase the bending rigidity of the splitter 12. It may be provided only in a certain length portion near the tip of the splitter, or the portion other than the necessary portion may not be box-shaped. Also,
Even when the reinforcing member 14 is provided over the entire length of the splitter, by providing only the core body 26 only in a certain length portion near the tip of the splitter,
The weight of the entire warizo can be further reduced.

As described above, since the warts of the present invention are provided with the reinforcing member 14 having a box structure, the bending rigidity of the warts can be increased, and the warts are made of a fibrous material in which fibers extend in the height direction of the warts. Since the core body 26 is provided, the impact force acting on the surface of the splitter is absorbed by the core body 26.
This prevents the box-shaped reinforcing member 14 from deforming and prevents the surface protection layer 16 from denting, cracking, or tearing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the outline of a shinai. Second
The figure is a cross-sectional view of the splitter of the present invention. FIG. 3 shows various configurations of a box-shaped reinforcing member and a core provided within the reinforcing member. 14... Box-shaped reinforcing member, 26... Core body made of fibrous material.

Claims (1)

[Claims] 1. The wariko that constitutes the shinai is made of a composite material that includes at least a reinforcing member, and the shape of the reinforcing member is box-like when viewed from the cross-sectional direction of the warashi, and the box-like shape is A wariko for a bamboo sword, characterized in that a core made of a fibrous material is provided in a region surrounded by the reinforcing member, and the fibers of the core extend in the height direction of the wariko.