JP4927915B2 - Stick shuriken - Google Patents

Description

The present invention relates to a rod and shuriken.

Due to physical structural problems, the range of hits by manual throwing (hereinafter also referred to as throwing) using the direct hitting method of a conventional sword shuriken (hereinafter referred to as a sword) is limited to four and a half (about 8m). The rate was generally low, close to 0%.

Moreover, even in throwing to the target in two and a half (about 4.5m) in normal practice, it takes a great deal of skill, and in order to seek competitiveness, it will be interested in throwing by competing a wide range of individual abilities of both young and old. There was no conditioning.

The problem with the physical structure mentioned here is that the conventional sword places the center of gravity closer to the center of the sword, so it rotates around the flight direction, and because it does not have a structure that actively seeks snapping to the sword, it goes straight to the sword There is no rifle swiveling for sex, and it means that the sword does not stab and stab at the target.

On the other hand, in this sword, the center of gravity (G) or the center of gravity (G) marker 4 is the length from the position of the center of gravity (g) or the center of gravity (g) of the marker 5 to the end of the shaft 2-2. The distance from the same position to the sword's center of gravity (G) or the marker 4 of the center of gravity (G) is within a numerical range of 17 to 23 as a ratio, and Since the surface of the shaft (anti-slip) 2-1 has unevenness, graininess, or embossed patterns to make it easier to snap, the rifle's radio effect makes the sword forward straight forward with no forward / backward rotation. Increased long-range hit accuracy.

Here, in the sword gripping posture shown in FIGS. 5 and 6, the sword center line 11 is formed by gripping the sword and has a posture inclined at about 20 ° with the direction line 12 that imagines the flight direction. The throwing is derived from the structure of the main sword where the back of the hand seen in Fig. 7 swings downward.

As an explanation of the manner in which the sword snaps when throwing, the middle of the belly 7 of the first joint of the index finger and the belly 8 of the second joint of the middle finger is the center of gravity (G) or center of gravity (G) of the sword The third joint of the thumb becomes the fulcrum of the marker 4 and the swinging motion (Fig. 7 ⇒ Movements of the hands (i), (b), (c)) moves away at a moment of about 1/50 second. The abdomen 10 of the back side and the abdomen 9 of the first joint of the thumb are the sword tail, and at the same time, the abdomen 7 of the index finger is rubbed against the shaft surface (non-slip) 2-1, and the direction of travel ⇒ It is assumed that a rifle swiveling with a rotational moment (c) is produced toward the mark (b).

Traditionally, the sword is a ninja martial art, and the striking method and the structure of the sword are concealed, and the techniques are not in the public domain.In practice, the sword is used with the left hand because of the strategy of handling the sword with the right hand or the martial arts strategy. It was in the hands of the hand-kneaded hands, and has become a foothold of modern development as a sporting event.

In this regard, this sword is a more modern and orthodox sporting competition with a long range and high accuracy. Here, kinetic energy and hit results are measured in terms of range and accuracy. Since it can compete, it has a scientific nature that can be introduced to school physical education under the rules, and it is a sport that entrusts a reasonable high degree of physicality and spirituality. On the other hand, it has an economic aspect, it can be enjoyed in a relatively small place at any time and anywhere, can always challenge to record, and has a search for as far as acquaintance in terms of sports culture And

This is because this sword has an extremely wide range of sports characteristics and can be operated and operated as a sport in the world, contributing to the advancement of physical education in the future and aiming for the Olympic events. Suppose you want to get.

The rod 1 made of heavy metal and the cylindrical shaft 2 made of light material are combined or integrally formed with screws at the joint 3 so that the center of gravity (G) or the marker 4 of the center of gravity (G) is only at the cutting edge of the rod. The length from the position of the marker 5 of the center of gravity (g) or the center of gravity (g) to the end 2-2 of the shaft is 100, and the distance from the same position to the marker 4 of the center of gravity (G) or the center of gravity (G) is A rod shuriken with a non-slip on the handle portion 1-2 of the heel and the surface 2-1 of the shaft in the specified numerical range of 17 to 23 as a ratio.
In order to increase the range and increase the accuracy, this sword is made of a heavy metal material such as iron, zinc and brass, and a cylindrical shape made of a relatively light material such as bamboo, duralumin, synthetic resin and glass fiber. The shaft 2 is combined with a screw at the joint 3 or bonded with an adhesive or integrally formed, and the position of the sword's center of gravity (G) or the marker 4 of the center of gravity (G) The length from the center 5 (g) of the 1-1 or the marker 5 of the center of gravity (g) to the shaft end 2-2 is 100, and from the same position to the marker 4 of the center of gravity (G) or the center of gravity (G) The distance is within the range of a numerical value that allows for the occurrence of a difference in the specified initial speed from 17 to 23 as a ratio.
As an anti-slip material, it is preferable to use unevenness, graininess, or a texture pattern.

By the way, if the center of gravity is arranged at a distance of 23 or more in comparison with the direction of the sword tail 2-2, the sword will rotate and you will not be able to see the target even if you get enough initial speed.

On the other hand, if the center of gravity is placed at a distance of 17 or less in the direction of Samurai 1, the center of the sword tail will not be able to be seen in the same way as throwing a hammer with a distinctive pattern. In addition, it has a structure that makes it easy to apply a snap by providing a non-slip, and causes a rifle swivel to seek straightness by its radio effect.

In addition, from observation of high-speed video images, a rifle turn number of 11 turns / 12 meters was found. The calculated number of revolutions is contrary to the conventional no-rotation or quarter-rotation seen in the past.

This sword raised the hit rate of conventional swords by 250% and showed the motto of this sword as “a sword that flies well and sticks properly”.

In addition, in the figure of gripping the sword called “grabbing method” in FIG. 8, the sword tail is sandwiched between the first joint of the thumb, the index finger and the second and third joints of the middle finger, and is thrown by throwing the upper hand. Suppose that you can achieve a range of up to 43.7m, and have a variety of competitive tastes, and your records will be permanently rewritten and updated according to your abilities.

Outline drawing of the entire sword Front view Rear view A-A cross section Top view of throwing hand Bottom view of throwing hand The figure which displays the rifle swivel of the center of gravity marker 5 which shows the center-of-gravity G of the step order of the hand to shake down, i, b, c Illustration of gripping a sword, called the “grabbing method” Positioning of the center of gravity (g) 5 of only the edge portion 1-1 of the heel A sketch of a sword with a flat-cut tip

The overall length of the sword is obtained from the standard palm hand size of men and women, but here it is 21 cm to 23 cm, the length of the plastic cylindrical shaft as the part is 9 cm to 16 cm, and It is realistic in each range of 6 cm to 12 cm in length, 0.7 cm to 1.1 cm in diameter, and 40 g to 60 g in weight.

In the embodiment, the shaft 2 of the cylindrical body made of ABS resin joined to the iron rod 1 having a thickness of 10 mmπ, a weight of 45 g and a length of 10 cm is 12 cm in length, 10 mmπ in thickness, 22 cm in total length, and has a total weight. It becomes a 50g sword. In this case, the position of the center of gravity of the sword is in the range of the numerical value that is measured and specified to 4.5 cm. In the case of the throwing by a person who is proficient in the direct hitting method, the accuracy is 95% at a range of 12 meters in this case. The longest hit range exceeded 27m.

Here, the center of gravity (g) or the marker 5 of the center of gravity (g) of the tip of the heel can be calculated and marked in the case of a regular cone, but in practice, the surface of the sword tip 1-1 of the heel or Since the peaks 1-4 have many free lines, the same method is cut and an actual measurement method is used in which the marker 5 of the center of gravity (g) is marked.

In addition, the spear sword with a flat tip shown in FIG. 10 is related to the new sword law that came into effect on June 1, 2009, and the tip of the sword has been changed to a hemisphere or a flat 1-3 from the standpoint of compliance with laws of public order and morals. In this case, it is emphasized that if the position of the center of gravity (G) of the sword is specified according to the present plan and a non-slip is provided, an extremely good range and accuracy can be maintained regardless of the shape.

In addition, since the body of the sword is cylindrical, a cap is attached to the sword tail, or it is integrally formed by insert molding of the metal part of the heel, and the shape of the shaft tail 2-2 is closed to avoid a sword. .

The product of the present invention, which is simple in structure and economically mass-produced, can be offered at a low price as a promising competition equipment for the formation of modern physical education as a sport, and contributes greatly to the industry and the physical education education industry that support modern sports. Can be

1 鏃 1-1 鏃 cut-off portion 1-2 柄 handle portion 1-3 鏃 柄 handle portion surface 1-4 鏃 cut-off portion (free line)
1-5 Flat heel tip 2 Shaft 2-1 Shaft surface (non-slip)
2-2 End of shaft 3 Joint 3-1 Joint 4 Center of gravity (G) of shuriken 5 or center of gravity (G) marker 5 Center of gravity (g) of cutting edge portion or marker 6 of center of gravity (g) Part 7 that is embedded and cannot be seen The center of the finger joint of the first joint of the index finger
8 Middle abdominal finger abdomen 9 Thumb first abdominal finger abdomen 10 Meat hill hitting the back of the third joint of the thumb 11 Direction line 12 Center line

Claims (1)

The rod 1 made of heavy metal and the cylindrical shaft 2 made of light material are combined or integrally formed with screws at the joint 3 so that the center of gravity (G) or the marker 4 of the center of gravity (G) is only at the cutting edge of the rod. The length from the position of the marker 5 of the center of gravity (g) or the center of gravity (g) to the end 2-2 of the shaft is 100, and the distance from the same position to the marker 4 of the center of gravity (G) or the center of gravity (G) of the sword is A rod shuriken with a non-slip on the handle portion 1-2 of the heel and the surface 2-1 of the shaft in the specified numerical range of 17 to 23 as a ratio.

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