JP3299864B2 - Bamboo sword - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bamboo sword.
In particular, by inserting a shock-absorbing member inside, the impact due to the impact is absorbed to extend the life.

[0002]

2. Description of the Related Art Bamboo swords used for kendo are made of natural bamboo such as bamboo, moso bamboo and katsura bamboo, or chemically processed such as impregnated with resin to reinforce the natural bamboo, or synthetic resin or metal. There is a material obtained by combining four pieces formed in the shape of a splitter as a material. However, bamboo swords made from materials other than natural bamboo have been commercialized in various ways up to now.
Not established except for seeds. Bamboo swords made of natural bamboo have a moderate elasticity and strong strain, and when combined with four splitters, those that feel like a single bamboo are considered the best. Among the bamboo, Japanese bamboo is the best material because it has high quality and shape, and satisfies all the requirements of bamboo swords. Nowadays, bamboo is becoming more expensive due to the decrease in production areas, making it difficult to obtain. Therefore, in general, natural bamboo other than bamboo is often used.

A completed bamboo sword S is a completed bamboo sword S composed of four splitters 1a (FIG. 3) and a bamboo sword main body 1 (FIGS. 4 and 5). 4, the inner skin 5, the collar 6, the collar rubber 7, and the handle 8 (FIG. 6) are assembled (FIG. 7). The tailoring method is as follows. The handle 8 is inserted and covered on the bamboo sword body 1 from the handle bottom 11 to the tip 12 of the bamboo sword body 1, and the rubber tip 3 is inserted from the tip 12 of the bamboo sword body 1. Is attached, and the leading skin 2 and the handlebar 8 are connected by the strings 4. Finally, the middle cuticle 5 is wound three times at the one-third position from the tip of the exposed portion of the bamboo sword body 1 and tied. The middle knot 5 prevents the four splitters 1a from spreading, and serves as a mark for the striking portion (from the tip to the middle knot) of the completed bamboo sword specified by the game rules.

As the name implies, bamboo sword S generally uses natural bamboo as described above. Natural bamboo always has knots. The bamboo sword 1a is divided into the first verse 13, the second verse 1
4. It is manufactured by arranging five sections from the third section 15 to the fifth section (FIGS. 3 and 4).

[0005] The hitting portion is defined by the rules of the game, and even if the hitting portion does not hit the other portion, it does not score. The length of the striking part is about 25 cm for boys and about 30 cm for adults from the tip skin 2, but it is quite difficult to hit this part against the opponent because the opponent may move, so it is very difficult to hit It also hits between two verses 14 well. As a result, over 99% of the damage is concentrated between the tip 12 and the second node 14. When a natural bamboo sword is used in a match or practice in a game or practice, it hits against the opponent's bamboo sword or the hard metal surface metal attached to the front of the surface, causing cracks and cracks on the splitter 1a. . It can be said that this is a major drawback of natural bamboo swords and cannot be avoided. If you continue playing and practicing without noticing the raised cracks and cracks, you can get into the opponent's face and eyes from the gap of the face, it may cause injury and blindness, rarely reach the brain and die Cases have also been reported. Nevertheless, there is no bamboo sword that is better than natural bamboo, so it is currently used with some danger.

The length of the bamboo sword S is within 3.6 m for boys, 3.7 m for junior high school students, 3.8 m for high school / college girls and general women, and for college students and men. There are detailed rules for age and gender, such as within 3.9 feet. In this way, there are always five knots, even if the overall length is different, from 3.6 m ≒ 1m for boys to 3.9 m ≒ 1.88m for general men. Field survey of 1,000 bamboo swords, regardless of overall length, Section 1
3 was within 30 cm from the tip 12, the second section 14 was located around 45 cm for boys, and the other sections were within 52 cm, accounting for more than 99% of the whole.

[0007] A generally square hollow 1b extends from the tip of the bamboo sword body 1 surrounded by four splitters 1a to the third section 15. The inner diameter is the third section 15 from the tip
It gradually increases toward. The larger the hollow 1b, the greater the amount of cracks and cracks. Therefore, as a solution to this problem, it was conceived to make the tip portion as thin as possible and to process the hollow 1b so as to eliminate it. However, in order to make the tip of the bamboo sword into a thickness that does not enter the gap of the metal sheet in the state of the finished product, the hollow 1 b always exists in a certain size from the tip 12 to the third section 15. . As described above, in the bamboo sword made of natural bamboo, scabs and cracks cannot be avoided, and 99% or more of the damaged portions are concentrated between the tip 12 and the second section 14. In short, the above survey values, ie, the tip 12 to 52
cm.

[0008]

In order to overcome the fatal disadvantage of the bamboo sword S, various types of cushioning members to be inserted into the hollow 1b have been invented and proposed. Among them, the one that seems to be the most effective is
No. 77 discloses a conventional technique, in which a hollow cylindrical synthetic resin core 20 of about 30 cm is provided to fill the hollow 1b portion (FIG. 8). The tape 21 is adhered to the inside of the splitter 1a of the bamboo sword main body 1.

However, according to this means, a gap is created between the splitters 1a and 1a due to the "sinner" characteristic of the bamboo sword S, the double-sided tape 21 is easily peeled off, and the inner core 20 comes out. (FIG. 9). If it occurs during training or during a game, there will be inconveniences that must be interrupted and repaired.

[0010] To overcome the above-mentioned deficiencies, Japanese Unexamined Utility Model Publication No. 60-122177 has proposed a device. This is a shock absorber which is mounted on a hollow portion of the bamboo sword S from the tip 12 to about 10 cm, and in which a movement preventing member 22 (FIG. 10) is attached to an inner core 20 made of a foamed synthetic resin instead of a double-sided tape. According to the detailed description of the invention, there is no peeling with a double-sided tape, no rubber tip 3 is required, and the length of the bamboo sword main body 1 can be reduced by about one third of the conventional length. It is an extremely effective device (FIG. 11).

However, this invention does not understand the meaning of mounting the inner core 20 made of a synthetic resin foam having a length of 30 cm as described above. As described above, since most of the damaged portions of the bamboo sword S are between the tip 12 and the second node 14 and are about 50 cm from the tip 12 as a whole, if it is mounted only about 10 cm from the tip 12, Only the effect of the rubber tip 3 attached to the tip of the bamboo sword main body 1 can be expected. In addition, although the weight is reduced because the whole is made of a foamed synthetic resin instead of the rubber tip 3, the role of the conventional rubber tip 3 is not understood. The reason for using a resilient member such as rubber or synthetic resin for the rubber tip 3 is to prevent the splitters 1a from hitting each other when hitting a bamboo sword. However, the above idea is the opposite, and the rate of breakage of the splitter 1a seems to be higher than before (FIG. 11). Further, the tip skin 2 and the movement preventing member 22 are easily broken ends, and if a kind of technique is frequently used, the tip is more likely to be damaged, and the risk that the splitter 1a enters from the surface metal increases.

Next, there is the following invention. That is, the core of the navel is made of a cushioning material such as rubber and is 20 cm in length.
The extension is to prevent breakage (Japanese Utility Model Laid-Open No. 4-126575). However, this invention downplays the weight that the previous two inventions avoid. That is, this is contrary to the basic idea that the tip of the bamboo sword S must not be heavy and the buffer member to be mounted must be light. 20cm cushioning member
When the above rubber member is used, its weight is definitely 50 g.
Beyond. On the other hand, for the bamboo sword S, the junior high school boy 425 in the finished product (Fig.
g or more, junior high school girls 400 g or more, high school boys 470 g
There is a provision that high school girls 410 g or more, university girls and general girls 420 g or more, and university students and general boys must use 500 g or more of bamboo swords (199).
5 years).

This weight regulation has been revised several times due to various circumstances (changes in physique) and has reached the present. Although stipulated by years of experience, many swordsmen use slightly light bamboo swords so that advantageous games can be developed, and sometimes use less than the rules for practice games that do not measure the weight of bamboo swords . If you practice for the first time in Kendo for the first time, you will be able to accurately determine the weight of bamboo swords without having to measure them, and you will be able to determine the balance of your favorite bamboo swords. In this way, since the experienced person realizes the weight and balance with a delicate sense, the weight of the tip side of the bamboo sword S is 50 g.
If it exceeds, the whole balance will be greatly collapsed and it will not be able to withstand use, and you will even feel discomfort. As a result, such a heavy shock absorber is not practical. Other,
There is also an invention or device as a shock absorber, but its effects,
Those satisfying simplicity and cost have not been proposed or put into practical use.

[0014]

SUMMARY OF THE INVENTION The present invention overcomes the above-mentioned disadvantages of the conventional invention and is lightweight, easy to mount, and firmly fixed so as to satisfy all necessary conditions. The purpose of the bamboo sword is not only to improve the safety by preventing the sword from being broken, cracked, and broken, but also to extend the life of the bamboo sword itself. For that purpose, the gist of the bamboo sword according to the present invention is a bamboo sword in which a buffer member having a length exceeding the second node from the tip is inserted, and the tip of the buffer member is made of soft or flexible rubber or rubber. The cover of the tip of the bamboo sword made of plastic and a short columnar insert are used.The main body is a lightweight core made of a foamed resin such as urethane foam, and these tips and the main body are integrally configured. It is characterized in that it is pressed by the inner projections of the first and second sections.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cushioning member 30 for eliminating such drawbacks (scratch, crack, etc.) of bamboo sword S is shown in FIGS. Based on the results of the survey, the total length was set to be 55 cm or more and extend beyond the second section 14 from the tip 12 of the bamboo sword.
In addition, if it is too long for boys, it is sufficient to cut and use it. The cushioning member 30 includes a distal end portion 31 and a main body portion 32.
It consists of The tip portion 31 has the same shape (length of about 3 cm) and material as the conventional rubber tip 3, and is made of rubber or synthetic resin having elasticity even if it is slightly hard. It is formed of a lightweight foamed resin such as urethane foam resin and styrene foam resin.

The bamboo sword main body 1 is manufactured so as to become thicker as it approaches the third section 15 from the tip 12, and the hollow 1b is the same. Therefore, the cushioning member 30 is entirely hollow 1
The hollow 1b extending from the tip 12 to the second node 14 is filled by increasing the thickness from the tip 31 toward the main body 32 in accordance with the shape of b. Each of the nodes of the splitter 1a constituting the bamboo sword body 1 also has projections on the inside corresponding to the projections on the surface (see FIG. 3). Since 13a and 14a are pressed against the outer periphery of the main body 32 and pressed, they do not jump out.

The tip portion 31 and the main body portion 32 are desirably formed by integral molding as much as possible, but this is because they are separated and do not protrude from the splitter 1a. In use, the integrity may be impaired, for example, by fitting them together with an adhesive. FIG.
Represents a specific shape of the cushioning member 30 of the bamboo sword S according to the present invention, which is changed in shape by using a one-third spherical protruding tip 31a to cover the end of the bamboo sword main body 1 at the tip end portion 31 in common. It is. The tip 31a may be square. a
b denotes a substantially columnar shape, cd denotes a prismatic shape, e denotes a tip portion 31 in a prismatic shape, and a main body portion 32 in a cylindrical shape. As described above, basically, the bd is gradually increased from the distal end portion 31 toward the main body portion 32, but the bd is made to gradually increase in thickness uniformly. A step is formed at the joint of the main body 32.

Since the tip portion 31 is heavy because of the long cushioning member 30, there is a concern that the balance of the bamboo sword may be lost. Since the main body 32 is made of lightweight foamed resin and weighs 8 to 10 g, the total weight of the entire cushioning member 30 is about 10 to 15 g. Even if the total weight of 15 g is concentrated on the tip part, it does not matter much. Even more, since the cushioning member 30 has a length of 50 cm or more, the weight will be distributed to the vicinity of the second section 14 and the conventional product Discomfort and imbalance are less of a problem.

[0019]

As described above, the present invention overcomes the drawbacks of the conventional invention described above, and is lightweight, easy to mount, and firmly fixed so as to satisfy all necessary conditions. Thus, the original purpose of the bamboo sword can be prevented from breaking, breaking, and breaking, and the bamboo sword main body can be prevented from being worn and contribute to improving safety. Moreover,
Since it is long and lightweight, it does not increase the weight of the bamboo sword as a whole,
Since the balance is not lost, it can be used without discomfort.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bamboo sword according to the present invention.

FIG. 2 is a front view of a buffer member inserted into a bamboo sword.

FIG. 3 is a perspective view of a bamboo sword splitter;

FIG. 4 is a perspective view of a bamboo sword main body.

FIG. 5 is a perspective view of a bamboo sword tip.

FIG. 6 is a perspective view showing constituent members of the bamboo sword other than the bamboo sword main body.

FIG. 7 is a front view of a bamboo sword.

FIG. 8 is a sectional view of a main part of a bamboo sword in which a conventional cushioning member is inserted.

FIG. 9 is a perspective view of a main part showing a use state of the bamboo sword of FIG. 8;

FIG. 10 is a perspective view of a buffer member of another bamboo sword.

11 is a cross-sectional view of the mounting state of the cushioning member shown in FIG.

[Explanation of symbols]

 S bamboo sword 1 bamboo sword main body 11 handle bottom 12 tip 13 first section 13a inner projection 14 second section 14a inner projection 15 third section 1a splitter 1b hollow 2 front skin 3 front rubber 4 string 5 middle skin 6 brim 7 flange stop Rubber 8 handle 30 cushioning member 31 tip 31a tip 32 main body

Claims (3)

(57) [Claims] 1. A bamboo sword for inserting a buffer member having a length exceeding a second node from a tip, wherein the tip of the buffer member is
A cover made of soft and flexible rubber or plastic at the tip of a bamboo sword and a short columnar insert, and a main body made of a lightweight core made of foamed resin such as urethane foam. A bamboo sword, wherein the main body is pressed by the inner projections of the first and second sections. 2. The bamboo sword according to claim 1, wherein the tip portion and the main body are integrally formed as a cushioning member. 3. The bamboo sword according to claim 1, wherein the distal end portion and the main body portion are formed separately and integrated so as not to be separated during use by fitting and / or bonding.