JPH0446780Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a wariko of a composite bamboo sword (shinai).

As the name suggests, shinai are widely used made from natural bamboo, but the biggest drawback of bamboo shinai is that they have low impact resistance. As a result, hangnails and cracks are likely to occur during use, and in some cases, death due to breakage may occur.

For this reason, composite shinai have been developed that combine various materials with excellent impact resistance such as FRP and metal.

However, in order for a composite shinai to be well accepted by users, it is not enough to simply have excellent impact resistance and safety;
Most of the composite shinai developed in the past have not been put into practical use. The reason for this is that the weight of the composite shinai is too heavy or the shape is different from the actual bamboo shinai (for example, a cylindrical shape).
This is because there was a great sense of incongruity between the conventionally developed composite shinai and the bamboo shinai in terms of feel in use. In order to reduce the weight of a composite shinai and improve its impact resistance, it is better to construct it like a single cylindrical body rather than having a complex structure consisting of four warizi like an actual bamboo shinai. It would be fine, but
This results in a completely different feeling of use. It is a composite shinai consisting of four warizi, and it is extremely difficult to make a composite shinai that is lightweight and impact resistant, but the applicant has solved these problems. We have filed numerous patent applications and utility model registration applications for the developed composite Shinai.

On the other hand, in the process of developing a series of composite Shinai, 4
In order to further improve the feeling of using a composite shinai made of wood splittings, the weight distribution over the entire length of the shinai should be appropriate, and the part of the shinai near the grip should be gripped with a strong grip. It has been found that it is important to be able to maintain a cylindrical shape at all times, and to prevent a struck wart from being deeply embedded between adjacent warts.

Therefore, an object of the present invention is to provide a composite shinai that can solve these problems with a simple structure.

To achieve this purpose, the wariko of the composite shinai of the present invention has a protrusion on its back surface with an abutting surface to prevent the wariko from being deeply fitted between adjacent warashi. However, so that the center of gravity of the splitter is located closer to the handle than the longitudinal center of the splitter, the area of the abutting surface of the protrusion is larger on the handle side than the longitudinal center of the splitter, Arrange it so that it is smaller on the tip side.

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

FIG. 1 is a perspective view schematically showing a composite shinai 10 made from the wariko 12 of the present invention. For clarity of the drawing, the tip leather, strings, leather straps, etc. have been omitted, but it is clear that the shinai 10 is composed of four warikos 12, just like a normal bamboo shinai. .

FIG. 2 shows one splitter 12 taken out, with the protrusion 14 of the present invention provided on its back surface 12a. The protruding portion 14 has a trapezoidal cross-sectional shape in the width direction of the splitter, the upper side of which is shorter than the lower side;
When viewed in this cross-sectional shape, the surfaces forming the sides form the abutting surfaces 14a. Such abutting surface 14a
When the shinai 10 is constructed by bundling the warikos 12, this forms a contact surface with adjacent warikos.

Natural bamboo shinai have a characteristic that the coefficient of friction of the bamboo flesh is high, so the warikos do not easily slip against each other without increasing the area of the contact sides of the warikos that are adjacent to each other. Therefore, when the grip part 10' (Fig. 1) of the shinai is grasped with strong force, the cylindrical shape may collapse, and when the shinai is hit, the wariko may not be able to close to the shinai. Although it is rare for the warikos to get stuck between the warikos, in the composite shinai 10 where plastic or the like is used as the outermost surface of the shinai, the warikos 12 may be stuck together due to the small coefficient of friction of the plastic. It is easy to slip and cause the above-mentioned problem.

Therefore, by providing the protrusion 14 as shown in FIG. 2, it is possible to increase the abutment area between the adjacent warizi 12, and it is possible to increase the abutment area between the adjacent warizi 12, which makes it possible to increase the abutment area of the composite shinai 10 in which plastic or the like is present on the outermost surface. Even if there is, the above problem can be eliminated.

In addition, the abutment surface 14a is inclined at approximately 45 degrees with respect to the bottom surface of the protruding portion 14 (i.e., the lower side when viewed in cross-sectional shape in the width direction) from the viewpoint of preventing slippage between the splitters. (See Figure 4).

In FIG. 2, symbol A indicates the hand portion of the splitter 12;
Symbol B indicates the tip, and symbol C indicates the maximum width portion. The maximum width C is usually approximately 2/3L (L) from the tip B of the splitter.
is formed along the entire length of the wart. The area of the abutment surface 14a of the protruding portion 14 is determined on the side of the hand portion A from the longitudinal center of the splitter, including the grip portion and the area of the maximum width portion C where the largest force is applied when receiving a blow. It is made to be large, and it is made to be small on the tip end B side from the longitudinal center of the splitter.
The abutting surfaces 14a on the proximal side and the distal side
The area ratio is preferably about 4:1, for example, as shown in FIG. 2, and at least the area on the proximal side must exceed the area on the distal side. As a result, it is important that the center of gravity of the splitter is located closer to the handle than the longitudinal center of the splitter. By doing this, the area near the tip is relatively lighter than the area near the hand, allowing agile operation of the shinai 10, and bringing the actual feeling of use closer to the feeling of using a bamboo shinai. is also possible. For this purpose, it is preferable to increase the height of the protruding part 14 between the proximal part A and the maximum width part C, and increase the length along the longitudinal direction of the splitter, and between the tip part B and the maximum width part C. It is preferable that the height and length of the protruding portion 14 be reduced between the two. In order to increase the length of the protrusion 14 along the longitudinal direction of the splitter, it is necessary not only to increase the length of the single protrusion 14 itself as shown in FIG. This can also be achieved by densely arranging relatively small protrusions 14'.

The material of the protrusion 14 is preferably one that has excellent adhesiveness to the material forming the back surface of the splitter 12 (for example, hard foamed plastic), and various rubbers, plastics, wood, etc. can be used.

It is also preferable that the cross-sectional shape of the protrusion 14 is trapezoidal in the longitudinal direction as well as in the width direction, as shown in FIGS. 3 and 5.

Firstly, a shinai bends when struck, etc., but this bending occurs, albeit temporarily, between the inner wariko and the outer wariko of the shinai. This causes a relative movement between the rod and the rod, whereby the protrusion 14 formed on the rod slides in the longitudinal direction of the rod. However, when the longitudinal cross-sectional shape of such a protrusion is rectangular, when the slid protrusion attempts to return to its original position at the end of its deflection, it may catch on the protrusion of another splitter. There is a problem that it once happened. In this regard, a protrusion having a trapezoidal cross-sectional shape in the longitudinal direction has the advantage that it can smoothly return to its original position when the deflection is completed without the protrusions catching on each other.

Second, compared to the protrusion with a rectangular cross-sectional shape corresponding to the length of the lower side of the trapezoid, there is sufficient adhesion to prevent the protrusion from falling off the splitter, similar to the rectangular one. It has the advantage of being lighter than a rectangular shape while ensuring a large area.

FIG. 4 shows a modified example in which the protrusion 14 is composed of two pieces and a hollow space is formed in the center. By configuring it in this way, the weight of the Shinai can be increased. A predetermined abutting area can be obtained without causing any damage. In FIG. 4, numeral 16 indicates a surface protection material for the splitter, and numeral 18 indicates a side protection material, which are made of high-density polyethylene, nylon, or the like having high impact resistance. Number 20 is the backing material, for example foamed plastic. The number 24 is a reinforcing member made of FRP, for example, and the region 22 surrounded by the reinforcing member 24 is filled with a lightweight core material such as wood or foamed plastic arranged so that the fibers are oriented toward the sides of the splitter. be done.

FIG. 5 shows a so-called "chigiri" 26 secured to the protrusion 14 of the present invention. "Chigiri" is to prevent each split of a shinai from shifting in the longitudinal direction, and is also used in ordinary bamboo shinai, but by providing the protrusion 14 of the present invention, Since there is no need to form grooves (grooves as shown by broken lines in FIG. 5) on the splitter 12 itself, the splitter 1
It is possible to increase the strength of 2.

In the bamboo sword wariko according to the present invention, the area of the abutment surface formed on the protrusion provided on the back side is made larger on the hand side than the longitudinal center of the warashi.
Hold the assembled bamboo sword firmly in your hand,
Even if a large force is applied to the proximal side during striking, the warts to which such force is applied will fit deeply between adjacent warts (the cylindrical shape formed by the warts will This can prevent it from collapsing.

On the other hand, by reducing the area of the abutting surface on the tip side of the splitter and allowing a moderate amount of slippage between the splitters during impact, it is possible to alleviate the excessive impact on the opponent. .

Furthermore, by using a wariko shinai constructed in accordance with the present invention, even in conventional composite shinai which has not been able to achieve proper weight distribution,
Since it is possible to achieve a weight distribution in which the area near the handle is heavier and the area near the tip is lighter, and the center of gravity is located closer to the handle, the operability and feeling of use of the composite Shinai can be brought closer to that of a bamboo Shinai. I can do it. In addition, by reducing the height of the protrusion in the region near the tip, it is possible to soften the blow.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a composite shinai made up of the shinai wariko of the present invention. FIG. 2 is a perspective view of one of the splitters of the present invention taken out and seen from the back side. FIG. 3 is a partial view of the protrusion provided on the splitter of the bamboo sword of the present invention, viewed from the side of the splitter. FIG. 4 is a cross-sectional view of a protrusion provided on the splitter of the bamboo sword of the present invention, viewed from the longitudinal direction of the splitter.
FIG. 5 is a partial view of the shinai of the present invention, with chigiri provided on the protruding portion of the splitter, as seen from the side of the splitter. 12... split, 14... protrusion.

Claims (1)

[Claims for Utility Model Registration] The back side of each warizo constituting a composite shinai has a protruding portion with an abutting surface to prevent the warizo from being deeply fitted between adjacent warizos. However, so that the center of gravity of the wart is located closer to the hand than the longitudinal center of the wart, the area of the abutting surface of the protrusion is larger on the hand side than the longitudinal center of the wart. The wariko of the composite shinai is arranged so that it becomes smaller on the tip side.