JPH0427870B2 - - 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 composite shinai in which a wariko is made of a reinforcing member, a surface protection material, etc.

As the name suggests, shinai are generally made from natural bamboo. The biggest drawback of bamboo shinai is that they have poor impact resistance, which means that they can crack or tear during use, and there is a risk that they will pierce the body.
In order to eliminate this risk, various types of composite shinai have been developed that are made from materials that do not easily crack or split even when subjected to impact. However, the reality is that almost none of the conventionally developed composite shinai are actually used. The reason is,
This is because the feeling of using a conventional composite shinai is completely different from the feeling of using a normal bamboo shinai. The main reason why conventional composite Shinai feel different when using them is that they are constructed in a cylindrical shape like a baseball bat, or even if they are not constructed in a cylindrical shape, they are extremely heavy. This is due to the fact that it is heavy.

Therefore, in order to make the feeling of using a composite shinai comparable to the feeling of using a bamboo shinai, the shinai should be composed of a wariko rather than a cylindrical rod like a baseball bat, and the outer shape and shape of the wariko should be changed. The important point is to make the weight as close as possible to the shape and weight of the wariko of a bamboo shinai.

The characteristics of the outer shape of the wariko of an actual bamboo shinai are that firstly, the width and thickness at the tip and the handle of the wariko are small, and the width and thickness are large at the part slightly away from the handle. Being familiar, 2nd
Second, the outer circumferential surface of the splitter is an arcuate surface corresponding to the outer surface of bamboo.

However, it is difficult to make the outer shape of the wariko of a composite shinai almost the same as the outer shape of the wariko of an actual bamboo shinai, which satisfies conditions such as bending rigidity, impact resistance, and light weight, due to manufacturing process and manufacturing costs. There are some restrictions from this point of view.

Therefore, an object of the present invention is to create a split shinai for a composite shinai that is made of a combination of various materials and that can have an external shape similar to that of an actual bamboo shinai using a simple method and at a relatively low manufacturing cost. It is to provide a child.

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

Figure 1 shows 10 bamboo shinai made of natural bamboo material.
A bamboo shinai 10 is usually composed of four bamboo splits 12.

FIG. 2 is a perspective view showing only one of the bamboo splitters 12. The bamboo splitter 12 has a small width and thickness at the tip A and the proximal part C, and the bamboo splitter 12 has a small width and thickness at the proximal part C. The first feature is that the width and thickness of the near part B are larger, and the splitter 12
The second feature is that the outer peripheral surface 13 is the outer surface of bamboo and is arcuate. The medium-thick shape of the wariko 12 has an important function in repelling the force received from the opponent's Shinai, and the arc-shaped outer circumferential surface 13 cushions the impact on the body. It has an important function in alleviating pain. Therefore, even when making a composite shinai, it is important not to lose these external features.

Figure 3 shows the cross-sectional shape of a composite shinai that satisfies conditions such as bending rigidity, impact resistance, and light weight, which is a composite shinai related to another application by the present applicant. be. A reinforcing member 14 is arranged at the center of this splitter. Since the reinforcing member 14 has the function of particularly increasing bending rigidity, it is preferably made of fiber-reinforced plastic (FRP) such as carbon fiber or glass fiber. Further, the reinforcing member 14 has upper and lower members 14e and side members 1
4b, but in some cases, only the upper and lower members 14a,
Alternatively, only the side member 14b may be used.
The area 24 surrounded by the reinforcing member 14 is preferably filled with a lightweight material such as wood, foamed plastic, or the like. A surface protection material 16, a side protection material 18, and a back material 20 are provided in a portion surrounding the reinforcing member 14.
is located. Of these, the surface protection member 16 and the side protection member 18 are members that are constantly subject to direct impact from the opponent's Shinai, so it is desirable that they be made of plastic, which has particularly excellent impact resistance.

When making a wariko for the composite shinai shown in Fig. 3, if the surface protection material 16 is formed into an arc shape in advance and then pasted, the outer periphery of the wariko can be made in the same way as natural bamboo material. Although it is possible to form an arcuate surface, it is necessary to make a special mold to form the arcuate surface in advance, which increases manufacturing costs. Therefore,
By pasting the surface protection material 16 in the form of a flat plate-like member as shown in FIG. 3, and then cutting the portion shown by cross hatching in FIG. 3, it is possible to create an arc-shaped surface similar to that of natural bamboo material. However, this method has the drawback that not only is the cutting process cumbersome, but also that the corners 22 of the reinforcing member 14 are likely to be exposed during cutting. From the viewpoint of increasing bending rigidity, it is desirable to arrange the upper reinforcing member 14a as close to the surface protection material 16 as possible, and to arrange the side members 14b as far apart as possible. At this time, the corner portions 22 of the reinforcing member 14 are more likely to be exposed.

Therefore, the wariko 12' of the composite shinai of the present invention has a fourth
As shown in the figure, the above problem is solved by providing a filler 26 between the surface protection material 16 and the reinforcing member 14 provided adjacent to the surface protection material 16.

The filler 26 preferably has a crescent-shaped cross-sectional shape with an arcuate convex surface, as shown in the cross-sectional shape of FIG. 4, but it may have another shape, such as a flat shape. By providing such a filler 26, the surface protection material 16 can be made into a flat plate-like member of equal thickness, and by pasting this on the filler 26, an arc-shaped surface similar to that of natural bamboo material can be created. Obtainable. Therefore, the surface protection material 16
By manufacturing it with a special mold or cutting it later, the process becomes unnecessary.

Further, as shown in FIGS. 5 and 6, the vertical cross-sectional shape of the filler 26 has a maximum height at a portion somewhat closer to the proximal portion (i.e., the maximum width portion B of the splitter in FIG. 2). , it has an approximately triangular shape with the height decreasing toward the tip and proximal portions of the splitter.

The upper end of this triangular shape may be pointed as shown, or it may have a suitable flattened portion. In this case, as shown in FIG.
It is optional whether or not they are partially arranged as shown in the figure.
As the filling material 26, it is preferable to use a lightweight material such as wood, foamed plastic, or the like.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the schematic structure of a conventional shinai made of natural bamboo material. FIG. 2 is a perspective view of one of the splitters of the bamboo shinai shown in FIG. 1. FIG. 3 is a cross-sectional view of a splitter of a composite shinai. FIG. 4 is a cross-sectional view of the splitter of the composite shinai according to the present invention, taken along the line - in FIG. 5. 5 and 6 are longitudinal sectional views of a splitter of a composite Shinai sword according to the present invention. 12, 12'...warrior, 16...surface protection material,
26...Filling material.

Claims (1)

[Claims] 1 A filler 26 extending in the longitudinal direction of the splitter is provided between the surface protection material 16 and the reinforcing member 14 provided adjacent to the surface protection material 16. A shinai wariko characterized by having a substantially triangular surface shape that has a maximum height at the widest part of the wariko and decreases in height toward the tip and handle of the wariko.