JP2020085437A - Dart for blowgun - Google Patents

Abstract

To provide a dart for a blowgun allowing high hit probability.SOLUTION: A dart comprises: a pin 1 of which a diameter of a cross section of a circular column part 3 is formed to be smaller than a maximum diameter of a cross section of a tip part 2 of a tear-drop shape; and a film 4 wound in a truncated conical shape, wherein the circular column part 3 of the pin 1 is inserted into and fixed to a truncated part 4a of the film 4, and the pin 1 has not only a length from a front end of the tear-drop shape forming the tip part 2 to an ideal point tip 2c of which a ratio to a maximum diameter of the cross section of the tear-drop shape is 216 to 272% but a length from the front end of the tear-drop shape to a position of the maximum diameter of the cross section of the tear-drop shape of which a ratio to the length from a front end of the tear-drop shape forming the tip part to an ideal point tip 2c is 14.7 to 23.1%. In accordance with an above-mentioned configuration, hit probability to a target is improved, as suppressing its vibration during flight.SELECTED DRAWING: Figure 2

Description

The present invention relates to an arrow used for a blowing arrow.

Regarding an arrow used for a blowing arrow, for example, as shown in Patent Document 1, a columnar pin that serves as a weight, and a substantially cone whose tip is fixed to the pin with the entire pin housed inside An arrow consisting of a shaped film has been proposed.

Further, in Patent Document 2, as a modification of the arrow described in Patent Document 1, in a pin including a tip portion and a columnar portion extending rearward from the tip portion, the tip portion is spherical or long. It is proposed that the directional cross section is formed into an elliptical shape (bale shape).

Utility model registration No. 3051432 Japanese Patent No. 4910074

However, in the case where the tip of the pin is formed in a spherical shape or has an elliptical (bale-shaped) cross section in the longitudinal direction, the air resistance during flight of the arrow is relatively large, However, the accuracy of hitting the arrow is reduced, which is a problem that cannot be overlooked by the competitors of the Fukiya competition, where the points are closely contested.

Therefore, in view of the above problems, the present invention has been made for the purpose of providing an arrow for a blowing arrow that can obtain a high hit rate.

In the present invention, the following configuration is adopted as a specific means for solving such a problem.

In the first invention of the present application, a teardrop-shaped tip portion having a dome shape in the front portion and a substantially conical shape in the rear portion, and a columnar portion extending to the rear portion of the tip portion, which is an arrow for blowing an arrow. And a pin formed such that the diameter of the cross section of the columnar portion is smaller than the maximum value of the diameter of the cross section of the tip portion, and a film wound in a truncated cone shape. The cylindrical portion of the pin is inserted into and fixed to the head, and the pin has the length from the teardrop-shaped front end forming the tip portion to the imaginary tip in the front-back direction. The ratio of the diameter of the cross section of the shape to the maximum value is 216-272%, and the length of the tear from the front end of the tear drop shape to the position where the diameter of the cross section of the tear drop shape is the maximum. The ratio of the length from the front end of the drop shape to the virtual tip is 14.7 to 23.1%.

In a second invention of the present application, the blower arrow according to the first invention, wherein the length of the film wound in the truncated cone shape in the front-rear direction is 200 mm±5 mm, and the film. The outer diameter of the rear end is 13.0 mm ± 0.2 mm.

In a third invention of the present application, the blower arrow according to the first invention, wherein the length of the film wound in the truncated cone shape in the front-rear direction is 205 mm±5 mm, and the film. The outer diameter of the rear end is 13.3 mm ± 0.2 mm.

(A) According to the first invention of the present application, the following effects can be obtained.
(A-1) Since the tip of the pin has a teardrop shape, for example, the air resistance during flight of the arrow is higher than that of a conventional arrow having a spherical or elliptical (bale-shaped) tip in the longitudinal cross section. In addition, since the center of gravity of the arrow is closer to the front of the arrow, blurring in the vertical and horizontal directions during flight of the arrow is suppressed, and the trajectory of the arrow approaches a straight line. Hit rate improves.

Particularly, in the first invention of the present application, the teardrop shape having a length from the front end of the teardrop shape forming the tip portion of the pin to an imaginary tip (hereinafter also referred to as “teardrop length”). To the maximum value of the diameter of the cross section (hereinafter also referred to as "the thickest part diameter") and the position at which the diameter of the teardrop-shaped cross section in the front-back direction of the pin becomes maximum (hereinafter, "the thickest part"). (Also referred to as “position”) within a specific range so that the shape of the teardrop forming the tip portion has a shape with less air resistance, and the position of the center of gravity is appropriately set to the front side. Therefore, the blurring of the arrow during flight can be further reduced and the trajectory of the arrow can be made closer to a straight line, so that the accuracy of hitting the arrow can be further increased.

The "teardrop shape" has a "dome shape" at the front portion and a "substantially conical shape" at the rear portion. This "teardrop shape" is said to have lower resistance to air and water than spherical or elliptical shapes, and is often used as the shape of airships and submarines. In addition, in the present invention, the “substantially conical” includes a so-called “conical” having a curved generatrix and a linear generatrix.

The front end of the pin has a dome shape at the front and a substantially conical shape at the rear, and the columnar part has its front end connected to a side surface of the substantially conical shape forming the rear part of the tip. Therefore, the teardrop-shaped apex (rear end) forming the tip portion is at a position buried (hidden) in the front end of the columnar portion and does not actually exist, and therefore, in the present invention, FIGS. 2 and 4 to 8 are used. As shown by imaginary lines, the teardrop-shaped apex is virtually recognized and the position is specified.

(A-2) In the first invention of the present application, the ratio of the length from the front end of the teardrop shape to the position of the thickest portion to the teardrop length is 14.7 to 23.1%, that is, the thickest Since the part position is relatively forward, the inclination angle of the surface between the front end of the tear drop shape and the thickest part position is relatively large. Therefore, at the time of a blowgun competition, there is a so-called "double" state in which the later fired arrows hit repeatedly from the back of the arrow that was stabbed first, and the tip of the rear arrow is the front arrow. When hitting the rear of the pin, the collision angle is large and it collides in a more vertical state, so the tip of the rear arrow can be held properly behind the pin of the front arrow. , Which has the effect of making it difficult for the "plucking arrow" to occur.

Here, when two arrows are overlapped and held in the “double” state, the score of the target score area where the preceding front arrow is stuck is also the score of the rear arrow. It is generally a desirable situation for competition because it is applied and added. On the other hand, a “repelled arrow” is a situation in which the rear arrow hits the front of the front arrow, but was hit by the rear arrow and did not become a “double”. In this case, the rear arrow The firing of the arrow is invalid and must be fired again, which is not desirable in competition.

(B) According to the second invention of the present application, the following effects can be obtained.
At present, in blowgun competitions that are widely practiced in Japan, the inner diameter of the injection cylinder used to fire the blowgun is mainly 13.0 mm. Therefore, the outer diameter at the rear end in the front-rear direction of the film wound in the shape of a truncated cone is normally set to about 13.0 mm, which is the same as the inner diameter of the injection tube, in order to efficiently receive the exhaled air of the athlete. Adjusted.

Therefore, as in the second invention of the present application, if the outer diameter of the trailing end of the film wound in a truncated cone shape is set to 13.0 mm ± 0.2 mm, the arrow can be used as it is for competition. It is convenient for athletes to do so.
Further, when the outer diameter of the rear end of the film is set to 13.0 mm±0.2 mm and the length in the front-rear direction of the film is set to 200 m±5 mm, the flight attitude of the arrow Z can be stabilized. Therefore, it is preferable.

(C) According to the third invention of the present application, the following effects can be obtained.
In the third invention of the present application, the length of the film wound in the truncated cone shape in the front-rear direction is 205 mm±5 mm, and the outer diameter of the rear end of the film is 13.3 mm±0.2 mm.

At present, in the blow-ball competition that is widely practiced in Japan, the inner diameter of the injection cylinder is mainly 13.0 mm as described above, so the outer diameter of the rear end of the film in the truncated cone shape of the arrow The inner diameter of the injection cylinder is usually set to about 13.0 mm. However, in order to adjust the outer diameter of the trailing edge of the frusto-conical film to be slightly larger or smaller according to the athlete's preference, the athlete himself must adjust the trailing edge of the frusto-conical film by several millimeters. It is being cut. Therefore, the truncated cone film of the arrow may be made slightly longer in the front-rear direction after manufacturing (at the time of sale), and the outer diameter of the rear end may be made slightly larger than 13.0 mm. good.

Therefore, as in the third invention of the present application, after manufacturing the arrow, the length of the truncated cone-shaped film in the front-rear direction is made longer than in use, and the outer diameter of the rear end is made larger than in use. By doing so, the athlete can adjust the outer diameter of the rear end of the frustoconical film according to his/her preference, so that the arrow according to the athlete's preference can be provided.

1 is an overall perspective view of an arrow for a blowing arrow according to a first embodiment of the present invention. FIG. 2 is an enlarged side view of a pin portion of the arrow shown in FIG. 1. It is an enlarged view of the A section of FIG. It is a side view of the arrow pin part which concerns on the 2nd Example of this invention. It is a side view of the arrow pin part which concerns on the 3rd Example of this invention. It is a side view of the pin part of the arrow which concerns on a 1st comparative example. It is a side view of the pin part of the arrow concerning the 2nd comparative example. It is a side view of the pin part of the arrow concerning the 3rd comparative example. It is a front view of the target of Fukiya. It is a perspective view of a blower injection cylinder and an arrow. It is a side view of the arrow pin which concerns on the prior art in which the longitudinal cross section of the front-end|tip part was formed in elliptical shape (bale shape).

"First Example"
1 to 3 show an arrow Z for a blowing arrow according to the first embodiment of the present invention. This arrow Z comprises a pin 1 and a film 4.
In addition, the arrow of "Sample 1" in the "launch test 1" and the arrow of "Sample 7" in the "launch test 2" described later correspond to the present embodiment.

"Pin 1 structure, etc."
As shown in FIGS. 1 and 2, the pin 1 has a teardrop-shaped tip portion 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a rear portion 2b from the rear portion 2b. It is a rod-shaped body having a predetermined length (20 mm in this embodiment) configured with the extending cylindrical portion 3, and the diameter (1.45 mm in this embodiment) of the cross section of the cylindrical portion 3 is the tip portion 2. Is set smaller than the maximum value (3 mm in this embodiment) of the diameter of the cross section.

Further, in the pin 1 of this embodiment, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 11.78 mm, and the dimension from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b (tip portion length ) Is 5 mm, and the diameter of the rear part 2b of the tip part 2 is 1.6 mm. Further, since the dimension (tear drop length) from the end face of the front part 2a of the tip part 2 to the teardrop-shaped tip 2c (above-mentioned virtual point) is set to 6.752 mm, the diameter of the thickest part of the tear drop length (3 mm The ratio (6.752/3) to () is 225.1%. Further, the length from the end face of the teardrop-shaped front portion 2a to the position where the diameter of the cross section of the teardrop-shaped portion is maximum (the thickest portion position) is 1 mm. The ratio (1/6.752) of the length from the end face of the part 2a to the thickest part position to the teardrop length is 14.81%, and the thickest part position is located in front of the teardrop shape. Is.

The pin 1 is preferably made of metal, stone, glass or the like in order to secure the mass and hardness necessary for the weight. As the metal, iron, brass, copper, stainless steel or the like, and those having their surfaces plated as necessary can be used. Further, the pin 1 can be integrally manufactured by cutting the whole of it from a cylindrical material with a lathe or the like, but it is manufactured by connecting the tip portion 2 and the cylindrical portion 3 separately and then joining them together. You may.

"Structure of film 4"
When the arrow Z is ejected from the injection cylinder 5 (see FIG. 10), the film 4 receives the exhaled air and gives thrust to the arrow Z, and when the arrow Z is ejected and flies toward the target. Has a function of stabilizing its flight attitude, and is formed by winding a film material having a predetermined shape around a jig to form a truncated cone shape with an open top. Then, as shown in FIGS. 1 to 3, the film 4 covers the entire cylindrical portion 3 from the side of the tapered portion 4a and the rear portion 3b of the cylindrical portion 3 of the pin 1 with respect to the pin 1. The arrow head Z is integrated with the pin 1 by being inserted and fixed to the front portion 3a of the columnar portion 3 with an adhesive, thereby forming the arrow Z.

In this embodiment, the length of the film 4 wound in the truncated cone shape in the front-rear direction is set to 200 mm, and the outer diameter of the rear end 4b of the film 4 is set to 13.0 mm. The outer diameter of the rear end 4b of the film 4 is set to 13.0 mm in correspondence with the inner diameter of the injection cylinder 5 for firing the arrow Z which is normally set to 13.0 mm in the blowing arrow competition. It is a thing. Further, the total length of the film 4 is set to 200 mm because it is set as an optimum dimension for stabilizing the flight attitude of the arrow Z.

When manufacturing and selling the film 4 in such a size, the athlete can use the outer diameter of the rear end of the film 4 for the competition as it is without adjusting the outside diameter. In another embodiment, the length of the film 4 in the front-rear direction may be 205 mm±5 mm, and the outer diameter of the rear end 4b of the film 4 may be 13.3 mm±0.2 mm. In this case, the athlete can adjust the outer diameter of the rear end by laterally cutting a predetermined position of the rear portion 4b of the film 4 according to his/her preference.

As the material of the film 4, various resins, paper, non-woven fabric and the like can be adopted, but it is preferable that the film 4 is lightweight and has a certain degree of rigidity and flexibility. Further, since the arrow is fired by the exhalation of the athlete, it is desirable that the film 4 has water resistance enough not to be deformed or damaged even when saliva is attached to the film 4. From this point of view, in this embodiment, the film 4 is formed by using oriented polypropylene having a thickness of 40 μm.

"Second Example"
FIG. 4 shows an arrow Z for a blowing arrow according to the second embodiment of the present invention. The arrow Z is configured to include the pin 1 and the film 4, but since the film 4 is the same as the film 4 in the first embodiment, description thereof is omitted here, and only the pin 1 is described. The structure and the like will be described.
In addition, the arrow of "Sample 2" in the "launch test 1" described later corresponds to this embodiment.

"Pin 1 structure, etc."
As shown in FIG. 4, the pin 1 has a teardrop-shaped tip 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a cylindrical portion extending rearward from the rear portion 2b of the tip portion 2. 3 is a rod-shaped body having a predetermined length (20 mm in this embodiment), and the diameter of the cross section of the cylindrical portion 3 (1.45 mm in this embodiment) is the cross section of the tip portion 2. Is set smaller than the maximum value (3 mm in this embodiment) of the diameter.

In the pin 1 of this embodiment, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 16.8 mm, and the dimension (tip portion length) from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b is set. The diameter of the rear portion 2b of the tip portion 2 is 6 mm and the diameter of the rear portion 2b is 1.6 mm.
Further, since the dimension (tear drop length) from the end surface of the front part 2a of the tip part 2 to the tear drop-shaped tip 2c is set to 8.141 mm, the ratio of the tear drop length to the thickest part diameter (3 mm) (8. 141/3) is 271.4%. Since such a ratio is larger than that of the first embodiment (225.1%), the teardrop shape is long and slim in the front-rear direction.

Further, in the pin 1 of this embodiment, the length from the end face of the teardrop-shaped front portion 2a to the position where the diameter of the teardrop-shaped cross section is the largest (the thickest portion position) is 1.2 mm. Therefore, the ratio (1.2/8.141) of the length from the end face of the teardrop-shaped front part 2a to the thickest portion position to the teardrop length is 14.74%, and the thickest portion position is It is located closer to the front of the teardrop shape than in the case of the first embodiment.

"Third Example"
FIG. 5 shows an arrow Z for a blowing arrow according to the third embodiment of the present invention. The arrow Z is configured to include the pin 1 and the film 4, but since the film 4 is the same as the film 4 in the first embodiment, description thereof is omitted here, and only the pin 1 is described. The structure and the like will be described.
In addition, the arrow of "Sample 3" in the "launch test 1" described later corresponds to this embodiment.

"Pin 1 structure, etc."
As shown in FIG. 5, the pin 1 has a teardrop-shaped tip portion 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a cylindrical portion extending rearward from the rear portion 2b of the tip portion 2. 3 is a rod-shaped body having a predetermined length (20 mm in this embodiment), and the diameter of the cross section of the cylindrical portion 3 (1.45 mm in this embodiment) is the cross section of the tip portion 2. Is set smaller than the maximum value (3 mm in this embodiment) of the diameter.

In the pin 1 of this embodiment, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 9.1 mm, and the dimension (tip portion length) from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b is set. The diameter of the rear portion 2b of the tip portion 2 is 5 mm and the diameter of the rear portion 2b is 1.6 mm.
Further, since the dimension (tear drop length) from the end face of the front part 2a of the tip part 2 to the tear drop-shaped tip 2c is 6.505 mm, the ratio of the tear drop length to the thickest part diameter (3 mm) (6. 505/3) is 216.8%. Since such a ratio is slightly smaller than that of the first embodiment (225.1%), it is a teardrop shape with a slightly dull shape.

Further, in the pin 1 of this embodiment, the length from the end face of the teardrop-shaped front portion 2a to the position where the diameter of the teardrop-shaped cross section is the maximum (the thickest portion position) is 1.5 mm. Therefore, the ratio (1.5/6.505) of the length from the end face of the teardrop-shaped front portion 2a to the thickest portion position to the teardrop length is 23.06%, and the thickest portion position is It is located closer to the rear of the teardrop shape than in the first and second embodiments.

"First Comparative Example"
FIG. 6 shows an arrow Z for a blowing arrow according to the first comparative example. The arrow Z is configured to include the pin 1 and the film 4, but since the film 4 is the same as the film 4 in the first embodiment, description thereof is omitted here, and only the pin 1 is described. The structure and the like will be described.
The arrow of "Sample 4" in "Launch Test 1" described later corresponds to this comparative example.

"Pin 1 structure, etc."
As shown in FIG. 6, the pin 1 has a teardrop-shaped tip 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a cylindrical portion extending rearward from the rear portion 2b of the tip portion 2. 3 is a rod-shaped body having a predetermined length (20 mm in this comparative example), and the diameter of the cross section of the cylindrical portion 3 (1.45 mm in this comparative example) is the cross section of the tip portion 2. Is set smaller than the maximum value (3 mm in this comparative example).

In the pin 1 of this comparative example, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 14.81 mm, and the dimension (tip portion length) from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b is set. The diameter of the rear portion 2b of the tip portion 2 is 5 mm and the diameter of the rear portion 2b is 1.6 mm.
Further, since the dimension (tear drop length) from the end surface of the front part 2a of the tip part 2 to the tear drop-shaped tip 2c is 6.996 mm, the ratio of the tear drop length to the thickest part diameter (3 mm) (6. 996/3) is 233.2%. Since this ratio is slightly larger than that in the first embodiment (225.1%), the shape is a slightly slim teardrop shape.

Furthermore, in the pin 1 of this comparative example, the length from the end surface of the teardrop-shaped front portion 2a to the position where the diameter of the teardrop-shaped cross section is the largest (the thickest portion position) is 0.5 mm. Therefore, the ratio (0.5/6.996) of the length from the end face of the teardrop-shaped front part 2a to the position of the thickest part to the length of the teardrop is 7.15%, and the position of the thickest part is It is located closer to the front of the teardrop shape than in the case of each of the above embodiments. Therefore, the dome shape of the front portion 2a of the tip portion 2 is considerably flat.

"Second Comparative Example"
FIG. 7 shows an arrow Z for a blowing arrow according to the second comparative example. The arrow Z is configured to include the pin 1 and the film 4, but since the film 4 is the same as the film 4 in the first embodiment, description thereof is omitted here, and only the pin 1 is described. The structure and the like will be described.
In addition, the arrow of "Sample 5" in the "launch test 1" described later corresponds to this comparative example.

"Pin 1 structure, etc."
As shown in FIG. 7, the pin 1 has a teardrop-shaped tip 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a cylindrical portion extending rearward from the rear portion 2b of the tip portion 2. 3 is a rod-shaped body having a predetermined length (20 mm in this comparative example), and the diameter of the cross section of the cylindrical portion 3 (1.45 mm in this comparative example) is the cross section of the tip portion 2. Is set smaller than the maximum value (3 mm in this comparative example).

In the pin 1 of this comparative example, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 7.7 mm, and the dimension (tip portion length) from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b is set. The diameter of the rear portion 2b of the tip portion 2 is 4 mm, and the diameter of the rear portion 2b is 1.6 mm.
Further, since the dimension (tear drop length) from the end surface of the front part 2a of the tip part 2 to the tear drop-shaped tip 2c is 5.354 mm, the ratio of the tear drop length to the thickest part diameter (3 mm) (5. 354/3) is 178.5%. Since such a ratio is smaller than that in each of the above-described examples, it is in a teardrop shape having a relatively dangling shape.

Further, in the pin 1 of this comparative example, the length from the end face of the teardrop-shaped front portion 2a to the position where the diameter of the teardrop-shaped cross section is maximum (the thickest portion position) is 0.8 mm. Therefore, the ratio (0.8/5.354) of the length from the end face of the teardrop-shaped front portion 2a to the thickest portion position to the teardrop length is 14.94%, and the thickest portion position is The positions are approximately the same as in the first and second embodiments.

"Third Comparative Example"
FIG. 8 shows an arrow Z for a blowing arrow according to the third comparative example. The arrow Z is configured to include the pin 1 and the film 4, but since the film 4 is the same as the film 4 in the first embodiment, description thereof is omitted here, and only the pin 1 is described. The structure and the like will be described.
In addition, the arrow of "Sample 6" in the "launch test 1" described later corresponds to this comparative example.

"Pin 1 structure, etc."
As shown in FIG. 8, the pin 1 has a teardrop-shaped tip portion 2 having a dome-shaped front portion 2a and a substantially conical rear portion 2b, and a cylindrical portion extending rearward from the rear portion 2b of the tip portion 2. 3 is a rod-shaped body having a predetermined length (20 mm in this comparative example), and the diameter of the cross section of the cylindrical portion 3 (1.45 mm in this comparative example) is the cross section of the tip portion 2. Is set smaller than the maximum value (3 mm in this comparative example).

In the pin 1 of this comparative example, the radius of curvature of the substantially conical generatrix forming the rear portion 2b of the tip portion 2 is 6.78 mm, and the dimension (tip portion length) from the end surface of the front portion 2a of the tip portion 2 to the rear portion 2b is set. The diameter of the rear portion 2b of the tip portion 2 is 5 mm and the diameter of the rear portion 2b is 1.6 mm.
Further, since the dimension (tear drop length) from the end face of the front part 2a of the tip part 2 to the tear drop-shaped tip 2c is 6.253 mm, the ratio of the tear drop length to the thickest part diameter (3 mm) (6. 263/3) is 208.4%. Since such a ratio is smaller than that in the first and third embodiments, it has a teardrop shape with a slightly dull shape.

Further, in the pin 1 of this comparative example, the length from the end face of the teardrop-shaped front portion 2a to the position where the diameter of the teardrop-shaped cross section is maximum (the thickest portion position) is 2 mm, Therefore, the ratio of the length from the end face of the teardrop-shaped front portion 2a to the position of the thickest portion to the length of the teardrop (2/6.253) is 31.98%, and the position of the thickest portion is the above-mentioned respective examples. Compared to, it is closer to the rear side.

"Arrow firing test, test results and consideration"
(1) Launch test 1
(1-1) Sample The arrows Z made up of the pin 1 and the film 4 shown in the first to third embodiments are referred to as "sample 1" to "sample 3", respectively, and the first to third comparisons are made. Arrows Z respectively shown in the examples are “Sample 4” to “Sample 6”, respectively, and further, arrows having a conventional structure in which the tip end portion of the pin is spherical (except for the shape of the tip end portion of the pin, all of the above-mentioned Examples Was used as "Sample X" and tested on each of all seven of these samples.

(1-2) Test Equipment The injection cylinder 5 that fires the arrow Z (see FIG. 10) is made of tubular glass fiber having a length of 120 cm and an inner diameter of 13.0 mm. The arrow Z is inserted and arranged inside the injection cylinder 5, and the arrow is fired by blowing a strong breath from the rear of the arrow Z.

As shown in FIG. 9, in the target 6 used for the test, four concentric scoring areas are displayed. The scoring areas are a 7-point area (diameter 6 cm) and a 5-point area (in order from the inside). The diameter is 12 cm, the area is 3 points (diameter 18 cm), and the area is 1 point (diameter 24 cm). The target 6 is composed of a cover 61 on which the score area is displayed and a pedestal 62 made of foamed polyethylene to which the cover 61 is attached. The arrow Z hitting the target 6 pierces the target 6 and It is possible to maintain the condition.

(1-3) Test Method The test was performed by the test executor standing at a position 10 m away from the target and shooting an arrow toward the target. The test executor is one man who is fully familiar with the Fukiya competition.
The test executor performed 5 sets of 30 arrows and 210 points as a perfect score for each sample, and the total number of arrows was 150 and 1050 points.

(2) Test result 1
Test result 1 of launch test 1 is shown in "Table 1" below.

The meanings of the terms in Table 1 are as follows.
"Tear drop length (mm)"... The length from the end face of the tear drop-shaped front portion 2a forming the tip portion 2 of the pin 1 to the virtual tip 2c (design value).
“Tear drop length/diameter of thickest part (%)”: The ratio of tear drop length to the diameter of the thickest part (design value).
"Position of the thickest part (%)" ··· About the position where the diameter of the teardrop-shaped cross section forming the tip 2 in the front-back direction of the pin 1 is the maximum, the front portion 2a of the tip 2 at that position The distance from the end face (design value) is expressed as a ratio to the tear drop length.
“Total pin length (mm)” ··· The total length of pin 1 in the front-rear direction (design value).
"Tip length (mm)"-The length of the tip 2 of the pin 1 in the front-rear direction (design value).
“Pin mass (g)”: This is the average value of the masses (measured values) of the 50 pins 1 arbitrarily selected.
“Arrow mass (g)”: The total mass of the arrow including the pin 1 and the film 4 and the adhesive that bonds the pin 1 and the film 4. It is the average value of the mass (measured value) of five arbitrarily selected samples from the samples of the arrows used in the test.
"Average score"... It is the average score per set when 5 sets of 1 set (maximum 210 points) are performed.
"Evaluation"-The evaluation of a sample whose average score has increased by 1 or more and less than 4 points from the average score of the competition using the conventional sample X is B (good), and the evaluation of the sample which has increased 4 or more points. It was set to A (best).

(3) Consideration on test result 1 (3-1) When the tip 2 of the pin 1 has a teardrop shape (samples 1 to 6) and the tip 2 has a spherical structure (sample X) It can be seen that the average score increases by 1 or more (evaluation A and B).

(3-2) When "tear drop length/diameter of thickest part" is approximately 216 to 272% and "position of thickest part" is approximately 14.7 to 23.1% (Sample 1 2, 3), the average point is increased by 4 points or more as compared with the case of the conventional structure in which the tip 2 of the pin 1 is spherical (Sample X) (Evaluation A).

(3-3) In Sample 4, the "position of the thickest part" was 7.15%, which was the most forward position among Samples 1 to 6, and therefore the dome shape of the front part 2a of the tip part 2 was considerably large. It is flat. Therefore, it is considered that due to the influence of air resistance during flight, although the average point reached the evaluation B (good) at 196.8, it did not reach the evaluation A (best).

(3-4) Sample 5 had a "tear drop length/the diameter of the thickest part" of 178.5%, and the tip 2 had the most dull tear drop shape among samples 1 to 6. .. Therefore, it is considered that, due to the influence of air resistance during flight, the average score reached B evaluation (good) at 196.4, but did not reach evaluation A (best).

(3-5) In Sample 6, the "position of the thickest portion" was 31.98%, which was the most rearward position among Samples 1 to 6 and the barycentric position of the arrow was also rearward. Therefore, while the arrows fluctuated slightly in the vertical and horizontal directions, the average score was 195.2 and B evaluation (good) was reached, but evaluation A (best) was not reached.

(3-6) Sample 4, in which the masses of both pin 1 and arrow Z are the second largest after sample 2, has the fourth highest average point. Further, the sample 6 having the fourth largest mass of the arrow Z has a lower average point than the sample 3 having the smaller mass of the arrow Z.

From the above (3-7), it can be seen that the influence of the mass of the pin 1 and the arrow Z on the height of the average point is small. That is, it can be said that the shape of the teardrop shape specified by "teardrop length/diameter of thickest portion" and "position of thickest portion" has a large effect on the height of the average point.

(4) Launch test 2
(4-1) Sample The arrow Z consisting of the pin 1 and the film 4 shown in the first embodiment is used as "Sample 7", and the longitudinal section of the tip portion shown in FIG. Tests were carried out using a pin having a conventional structure, and using an arrow similar to the arrow Z in the above-described first embodiment as a "sample Y" except for the pin.

(4-2) Test Equipment As described in (1-2) above, the same test equipment as in the launch test 1 was used.

(4-3) Test method As described in (4-3) above, the same test method as in the firing test 1 was used.

(5) Test result 2
Test result 2 of launch test 2 is shown in "Table 2" below.

The meanings of the terms in Table 2 are as follows.
"Tear drop length (mm)"... The length from the end face of the tear drop-shaped front portion 2a forming the tip portion 2 of the pin 1 to the virtual tip 2c (design value).
“Tear drop length/diameter of thickest part (%)”: The ratio of tear drop length to the diameter of the thickest part (design value).
“Position of thickest part (%)” ··· For the position where the diameter of the teardrop-shaped cross section forming the tip 2 in the front-back direction of the pin 1 is the maximum, the front portion 2a of the tip 2 at that position The distance from the end face (design value) is expressed as a ratio to the tear drop length.
“Pin total length (mm)”: Total length of pin 1 in the front-rear direction (design value).
"Tip length (mm)"-The length of the tip 2 of the pin 1 in the front-rear direction (design value).
“Pin mass (g)”: This is the average value of the masses (measured values) of the 30 pins 1 selected arbitrarily.
"Arrow mass (g)"-It is the mass of the entire arrow including the pin 1 and the film 4, and the adhesive for bonding the pin 1 and the film 4. It is the average value of the masses (measured values) of eight samples arbitrarily selected from the samples of the arrows used in the test.
“Average point” ··· This is the average point per set when 5 sets (1 point out of 210 points) are performed.

(6) Consideration on test result 2 (6-1) When the tip 2 of the pin 1 has a teardrop shape (Sample 7), the case where the tip 2 has a bale shape has a conventional structure (Sample Y). Also, it can be seen that the average score increases by 3.2 points. This result shows that if the tip 2 of the pin 1 is shaped like a teardrop, the air resistance during flight of the arrow will be reduced and the center of gravity of the arrow will be closer to the front than the shape of a bale. It is thought that this is because the vertical and horizontal blurring was suppressed, and the hit rate to the target high score area was improved.

(6-2) Although the arrow of sample 7 used in firing test 2 has the same design form as the arrow of sample 1 used in firing test 1, the average point of sample 7 of test result 2 (196 .4 points) is 3.6 points lower than the average point (200 points) of Sample 1 of Test Result 1. It is considered that this is mainly due to the difference in skill of the test executor during each test.

The blowing arrow according to the present invention is used in the fields of entertainment and sports such as blowing competition.

1 ・・Pin 2 ・・Tip 3 ・・Cylinder 4 ・・Film 5 ・・Injection tube 6 ・・Target Z ・・Arrow

Claims (3)

The front part has a teardrop-shaped tip part having a dome shape and the rear part has a substantially conical shape, and a columnar part extending to the rear part of the tip part. A pin formed to be smaller than the maximum diameter of the cross section of
It consists of a film that is rolled into a frustoconical shape,
The cylindrical part of the pin is inserted and fixed to the head of the film,
In the anteroposterior direction of the pin, the ratio of the length from the front end of the teardrop shape forming the tip to the imaginary tip to the maximum value of the diameter of the cross section of the teardrop shape is 216 to 272%. And the ratio of the length from the front end of the teardrop shape to the position where the diameter of the cross section of the teardrop shape is maximum to the length from the front end of the teardrop shape to the virtual tip. An arrow for blowgun, characterized in that it is 14.7 to 23.1%. The length in the front-rear direction of the truncated conical film is 200 mm±5 mm, and the outer diameter of the rear end of the film is 13.0 mm±0.2 mm. The arrow for the blowgun according to 1. The length of the film wound in the shape of a truncated cone in the front-rear direction is 205 mm±5 mm, and the outer diameter of the rear end of the film is 13.3 mm±0.2 mm. The arrow for the blowgun according to 1.

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