Arrows for blowguns and their manufacturing method

Abstract

To provide a dart for a blowpipe capable of replacing a vane and a manufacturing method of the same.SOLUTION: In a dart for a blowpipe having a pin 2, a vane 6, a shaft 3, a coupling member 4 and a tubular member 5, a first dart unit Ua is configured by fixing the vane 6, the tubular member 5 and the coupling member 4 integrally, a second dart unit Ub is configured by fixing the shaft 3 and the pin 2 integrally, and the first dart unit Ua and the second dart unit Ub can be coupled and divided. According to the configuration, when the vane 6 breaks, only the first dart unit Ua needs to be replaced, thus it is economical and when the dart 1 gets dirty, only the first dart unit Ua needs to be disposed and replaced with new one, thus the dart 1 can be always used in a clean condition and it is hygienic.SELECTED DRAWING: Figure 16

Description

[Technical Field]

[0001] The present invention relates to an arrow used in a blowgun and a method for manufacturing the same. [Background technology]

[0002] Regarding arrows used in blowguns, for example, as shown in Patent Document 1, there are known arrows that have a pin consisting of a tip portion with a teardrop-shaped or bullet-shaped longitudinal cross section and a cylindrical portion extending rearward from the tip portion, and a feather (film) that is formed in a cone shape and has the cylindrical portion of the pin inserted and fixed to the tip portion.

[0003] In the above arrow, the pin functions as a weight, and the feathers receive the breath that is blown onto the arrow when it is fired from the firing tube, giving the arrow thrust, and also function to stabilize the arrow's flight posture when it is fired and flying towards the target.

[0004] Whether played competitively or individually, blowguns are basically played by firing an arrow from a nozzle at a target placed a predetermined distance away, and competing for points based on where the arrow pierces the concentric scoring circle drawn on the target.

[0005] A problem with blowgun play is damage or dirt to the feathers at the rear of the arrows. Arrows are shot sequentially toward the target, and when they do, for example, the pin of a subsequent arrow collides with the feather at the rear of the "leading arrow" that hit the target first, causing damage or dirt to the feathers of the "leading arrow." Furthermore, because the feathers of the arrows are soft, made by wrapping film around a truncated cone, they can easily be damaged by accident even during normal handling.

[0006] On the other hand, the pin portion of the arrow is made of, for example, metal or hard resin, which is relatively strong and unlikely to break, and can be easily cleaned if it becomes dirty. Therefore, if damage or dirt to the feather portion of the arrow can be dealt with by simply replacing the feather portion, it would be economical and desirable.

[0007] However, as shown in Patent Document 1, conventional arrows have a structure in which the pin and feathers are glued together and cannot be separated for reuse. Therefore, if the feathers are damaged or soiled, the entire arrow must be replaced with a new one, which is extremely uneconomical. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2020-91095 Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, the present invention has been made with the objective of providing a blowgun arrow with replaceable feathers and a method for manufacturing the same. [Means for solving the problem]

[0010] The present invention employs the following configuration as a specific means for solving the above problems.

[0011] "The first invention of this application" The blowgun arrow according to the first invention of the present application comprises a pin consisting of a tip portion and a fixing portion extending from the rear of the tip portion, a vane formed by wrapping film in a truncated cone shape, a rod-shaped shaft of a predetermined length having an axial hole at its front end on its axis and a female screw hole or male screw shaft at its rear end, a connecting member of a rod-shaped body of a predetermined length having a male screw shaft or female screw hole at its front end on its axis and a cylindrical portion at its rear end, and a tubular body of a predetermined length having an inner peripheral surface that serves as a receiving hole for the cylindrical portion of the connecting member, and the tubular member is placed on the inner surface of the truncated portion of the vane, and the cylindrical portion of the connecting member is inserted into the receiving hole of the tubular member, a rear end of the cylindrical portion protruding rearward beyond the rear end of the tubular member to form an annular groove formed by the outer circumferential surface of the cylindrical portion, the rear end of the tubular member, and the inner circumferential surface of the blade; and an adhesive is pooled in the annular groove and hardened, The first arrow unit is formed by fixing and integrating the blade, the tubular member and the connecting member, and the second arrow unit is formed by inserting the fixing portion of the pin into the axial hole of the shaft and fixing and integrating the shaft and the pin, and the first arrow unit and the second arrow unit can be connected and separated by screwing or unscrewing the female screw hole or male screw shaft of the shaft on the second arrow unit side into the male screw shaft or female screw hole of the connecting member on the first arrow unit side.

[0012] "Second invention of the present application" The second invention of the present application is characterized in that, in the blowgun arrow of the first invention, the outer surface of the tubular member is a tapered surface having a gradient that approximately matches the expansion angle of the blades.

[0014] "The first part of the original vow 3 The Invention of The first part of this application 3 In the present invention, the first or second In the arrow for a blowgun according to the invention, the fixing portion of the pin is formed in a cylindrical shape, and a male screw is provided on part or the entire outer surface of the fixing portion.

[0015] "The first part of the original vow 4 The Invention of The first part of this application 4 In the method for manufacturing an arrow according to the present invention, the first to the second methods are 3A method for manufacturing an arrow for a blowgun according to any one of the above-mentioned inventions, comprising: a first step of inserting a tubular member of a predetermined length into a parallel shaft portion of a jig, the parallel shaft portion being formed by extending coaxially from the small diameter end of the tapered shaft portion; a second step of wrapping a film around the outer circumferential surface of the tapered shaft portion of the jig so as to enclose the tubular member, thereby forming a truncated cone-shaped blade; and a second step of removing the jig from the tubular member and blade side, after which an adhesive is applied to the blade from the truncated side. a fourth step of inserting the cylindrical portion of the connecting member into the inner periphery of the tubular member from the front end side thereof and fixing the feathers, the tubular member and the connecting member with the adhesive to obtain a first arrow unit; a fifth step of fixing the fixing portion of the pin to the axial hole on the front end side of the shaft to obtain a second arrow unit; and a sixth step of coaxially connecting the front end of the connecting member on the first arrow unit side to the rear end of the shaft on the second arrow unit side to obtain an arrow for a blowgun. [Effects of the Invention]

[0016] (a) The blowgun arrow according to the first invention of the present application provides the following effects. (a-1) Since blowgun arrows have a separate structure consisting of a first arrow unit including the feathers and a second arrow unit including the pin, if a feather is damaged, only the first arrow unit needs to be replaced. This is more economical than, for example, the conventional method of replacing the entire arrow including the feathers, and the effect is particularly noticeable when using a large number of arrows, such as in tournament play.

[0017] (a-2) When the arrow becomes dirty, the pins and shafts belonging to the second arrow unit are made of hard materials such as resin or metal and are not easily damaged, so they can be washed and reused. Therefore, it is sufficient to discard only the first arrow unit, which contains the feathers that are difficult to wash and reuse, and replace it with a new one. As a result, it is more economical than discarding and replacing the entire arrow, and by discarding and replacing the first arrow unit, the arrow can always be used in a clean condition, making it hygienic.

[0018] (a-3) The pin, shaft, connecting member, tubular member, and feathers that make up the arrow are integrated on approximately the same axis, and since the connecting member and the feathers are fixed via the tubular member, the central axis of the connecting member and the central axis of the feathers can be made to approximately overlap, so that the center of gravity of the arrow is located on the central axis of the arrow.As a result, the arrow's vertical and horizontal fluctuations during flight can be suppressed, and the arrow's flight trajectory can be made as close to a straight line as possible, thereby increasing the probability of hitting the target.

[0019] (a-4) By making the rear end of the cylindrical portion of the connecting member protrude further rearward than the rear end of the tubular member, an annular groove is formed by the outer circumferential surface of the cylindrical portion of the connecting member, the rear end of the tubular member, and the inner circumferential surface of the blade, and adhesive is accumulated in the annular groove and hardened, so that the connecting member, the tubular member, and the blade can be fixed together with greater strength. Therefore, for example, when screwing or unscrewing the first arrow unit Ua and the second arrow unit Ub of the arrow, if the fingers hold the area near the cut end of the feather tightly, a large force may be applied to the feather, causing the inner surface of the feather to peel off from the outer surface of the tubular member. However, according to the first invention, the strength of the bond between the inner surface of the feather and the outer surface of the tubular member can be significantly increased, thereby preventing the problem of the inner surface of the feather peeling off from the outer surface of the tubular member.

[0020] (b) According to the blowgun arrow of the second invention of the present application, by making the outer surface of the tubular member a tapered surface with a gradient that approximately matches the expansion angle of the feathers, the central axis of the connecting member and the central axis of the feathers can be more precisely aligned, thereby further enhancing the effect described in (a-3) above.

[0021] (c) The first part of this application 3 According to the blowgun arrow of the invention, the fixing portion of the pin is formed cylindrically, and a male screw is provided on part or the entire outer surface of the fixing portion, so that when the fixing portion is inserted into the axial hole of the shaft and fixed, the fixing portion can be screwed into the axial hole and the male screw fitted into the inner surface of the axial hole, thereby making it possible to fix with greater strength.

[0022] (d) The first part of this application 4 According to the method for manufacturing an arrow for a blowgun according to the present invention, the first arrow unit including the feathers and the second arrow unit including the pin are manufactured in separate steps, and then the first arrow unit and the second arrow unit are assembled to obtain the desired arrow for a blowgun. Therefore, compared to the case where the desired arrow for a blowgun is obtained through successive steps, the process management of the work is easier, and for example, the first to second arrow units of the present invention can be easily managed. 3 The arrows for blowguns according to the present invention can be efficiently manufactured. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is an overall perspective view of an arrow for a blowgun according to the present invention. [Figure 2] FIG. 2 is an explanatory diagram of a first structural example of a pin. [Figure 3] FIG. 10 is an explanatory diagram of a second structural example of the pin. [Figure 4] FIG. 2 is a diagram illustrating the structure of a shaft. [Figure 5] FIG. [Figure 6] 3A and 3B are explanatory diagrams of a first structural example of a tubular member. [Figure 7] FIG. 10 is an explanatory diagram of a second structural example of the tubular member. [Figure 8] FIG. 2 is an explanatory diagram of the first step in the method for manufacturing an arrow according to the present invention. [Figure 9] FIG. 10 is an explanatory diagram of the second step. [Figure 10] FIG. 10 is an explanatory diagram of the third step. [Figure 11] FIG. 10 is an explanatory diagram of the fourth step. [Figure 12] FIG. 10 is an explanatory diagram of the fifth step. [Figure 13] FIG. 10 is an explanatory diagram of a first example of the sixth step. [Figure 14] FIG. 1 is a structural explanatory diagram of a jig used in manufacturing arrows. [Figure 15] FIG. 10 is an explanatory diagram of a third structural example of the pin. [Figure 16] FIG. 10 is an explanatory diagram of a second example of the sixth step. DETAILED DESCRIPTION OF THE INVENTION

[0024] Fig. 1 shows an arrow 1 according to an embodiment of the present invention. This arrow 1 is composed of a pin 2, a shaft 3, a connecting member 4, a tubular member 5 (see Fig. 6), and feathers 6. The specific structure of each of these components and a method for manufacturing an arrow using these components will be explained below.

[0025] A: Structure of each component A-1: Pin 2 2 shows the pin 2. This pin 2 is provided at the tip of the arrow 1 and functions as a weight, and is a rod-like body of a predetermined length (10 mm in this embodiment) composed of a teardrop-shaped tip portion 2a and a cylindrical fixed portion 2b extending rearward from the rear of the tip portion 2a, and the diameter of the cross section of the fixed portion 2b (1.45 mm in this embodiment) is set smaller than the maximum value of the diameter of the cross section of the tip portion 2a (3.4 mm in this embodiment).

[0026] The shape of the tip 2a of the pin 2 may be teardrop-shaped as described above, or may be bullet-shaped as in the pin 2 shown in Figure 3. Furthermore, other than these, it is also possible to set the tip 2a to various shapes, such as a sphere, a bale, or an ellipse in cross section in the longitudinal direction.

[0027] On the other hand, the fixing portion 2b of the pin 2 is generally formed in a cylindrical shape as shown in Figures 2 and 3, but is not limited to this and can be appropriately set as needed, for example, in a triangular prism, a square prism, a cone, a triangular pyramid, a square pyramid, or the like.

[0028] 15, the fixing portion 2b may be formed in a cylindrical shape and further provided with a male thread 2c on a part or the entire outer circumferential surface of the fixing portion 2b. In this case, as will be described later, when the fixing portion 2b is inserted into the axial hole 3c of the shaft 3 and fixed, the fixing portion 2b can be screwed into the axial hole 3c and the male thread 2c fitted into the inner circumferential surface of the axial hole 3c, thereby achieving greater fixing strength.

[0029] The pin 2 is preferably made of metal, stone, glass, etc., in order to ensure the mass and hardness required for a weight. Metals that can be used include iron, brass, copper, stainless steel, aluminum, etc., and if necessary, these metals may be plated on their surfaces. In this embodiment, tinplate, which is iron with a tin-plated surface, is used.

[0030] A-2: Shaft 3 4, the shaft 3 is a rod-like body of a predetermined length, and its outer circumferential surface is a tapered surface with a gradient (for example, about 1.7°) that roughly matches the expansion angle of the blades 6 described below. An axial hole 3c extending along the central axis of the shaft 3 is formed in the tip end 3a on the small diameter side of the shaft 3. The fixing portion 2b of the pin 2 is inserted into this axial hole 3c and fixed with an adhesive.

[0031] Also, as shown in Figure 15, when a male thread 2c is provided on the outer peripheral surface of the fixing portion 2b of the pin 2, a female thread may be formed on the inner peripheral surface of the axial hole 3c of the shaft 3 to thread onto the male thread 2c of the pin 2. As will be described in detail later, the fixing portion 2b of the pin 2 is inserted into the shaft hole 3c of the shaft 3 and fixed to integrate the shaft 3 and the pin 2, thereby forming the second arrow unit Ub.

[0032] On the other hand, a female screw hole 3d extending on the central axis of the shaft 3 is formed in the rear end portion 3b on the large diameter side of the shaft 3. A male screw shaft 4a of a connecting member 4 described later is screwed into this female screw hole 3d. This connecting member 4 constitutes the first arrow unit Ua together with a tubular member 5 and a blade 6, as described later. Therefore, by screwing the male screw shaft 4a of the connecting member 4 into the female screw hole 3d of the shaft 3, the first arrow unit Ua and the second arrow unit Ub are coaxially connected, and the arrow 1 is formed.

[0033] The shaft 3 is made from various resin materials and metal materials, but in this embodiment in particular, the shaft 3 is made from ABS resin, taking into consideration that it has an excellent balance of various mechanical properties and an aesthetically pleasing surface.

[0034] A-3: Connecting member 4 As shown in Fig. 5, the connecting member 4 is composed of a rod-shaped body in which an externally threaded shaft 4a, a flange 4b, and a cylindrical portion 4c are coaxially connected, and the externally threaded shaft 4a is threadedly engaged with the internally threaded hole 3d of the shaft 3, as described above. The cylindrical portion 4c is fitted into a receiving hole 5d of a tubular member 5, which will be described later (see Fig. 11). The diameter of the flange 4b ​​is set to be slightly larger than the diameter of one end 5a on the small diameter side of the tubular member 5, which will be described later. This is because, when the cylindrical portion 4c is fitted into the receiving hole 5d of the tubular member 5, as shown in Fig. 11, the flange 4b ​​closes the open end of the truncated portion 6a of the blade 6, which is positioned to extend axially outward from one end 5a of the tubular member 5.

[0035] It is desirable that the length of the cylindrical portion 4c of the connecting member 4 be such that, when the first arrow unit Ua of the arrow 1 is manufactured, the rear end portion 4d of the cylindrical portion 4c protrudes slightly rearward from the rear end portion (other end portion 5b) of the tubular member 5, as shown in Figure 16. In this case, an annular groove portion 14 is formed by the outer surface of the cylindrical portion 4c of the connecting member 4, the rear end portion (other end portion 5b) of the tubular member 5, and the inner surface of the blade 6, and by collecting and hardening adhesive 8 in this annular groove portion 14, the connecting member 4, the tubular member 5, and the blade 6 can be fixed with greater strength. In this embodiment, the length of the portion of the cylindrical portion 4c of the connecting member 4 that protrudes from the other end 5b of the tubular member 5, i.e., the distance between the rear end 4d of the cylindrical portion 4c and the other end 5b of the tubular member 5, is approximately 0.5 mm to 2.5 mm.

[0036] The connecting member 4 is made of various metal materials or resin materials, but in this embodiment, tinplate, which is iron with a tin-plated surface, is used.

[0037] A-4: Tubular member 5 6, the tubular member 5 is constituted by a hollow tube of a predetermined length, and its outer peripheral surface 5c is a tapered surface having a gradient (for example, about 1.7°) that substantially matches the expansion angle of the blades 6 described later, and the truncated portions 6a of the blades 6 described later are attached and fixed to this surface over substantially the entire area from one end 5a on the small diameter side to the other end 5b on the large diameter side (see FIG. 10). The inner peripheral surface of this tubular member 5 is formed as a receiving hole 5d, into which the cylindrical portion 4c of the connecting member 4 is fitted.

[0038] In this embodiment, the outer circumferential surface 5c of the tubular member 5 is a tapered surface, but this is not limited to this, and in other embodiments, the tubular member 5 may be configured as a straight tube whose outer circumferential surface 5c is a parallel surface, as shown in Fig. 7. The tubular member 5 may be made of various metal materials or resin materials, but in this embodiment, it is made of aluminum.

[0039] A-5: Feather 6 The feathers 6 receive the breath blown onto the arrow 1 when the arrow 1 is fired from the firing tube (not shown) to give it thrust, and also function to stabilize the flight posture of the arrow 1 when it is fired and flies towards the target.A film of a predetermined shape is wrapped around a jig 10 (see Figure 14) described later and the tubular member 5, and formed into a truncated cone shape with an open top.

[0040] In this embodiment, the axial length of the blade 6 is set to approximately 200 mm, the outer diameter of the rear end 6b of the blade 6 is set to approximately 13.0 mm, and the outer diameter of the front end, i.e., the truncated head 6a, is set to approximately 3 mm (see Figure 1). Furthermore, various resins, papers, nonwoven fabrics, etc. can be used as the material for the film that makes up these feathers 6, but it is desirable that it be lightweight and have a certain degree of rigidity and flexibility. Furthermore, because the arrow is shot using the breath of the athlete, it is desirable that feathers 6 have water resistance to the extent that they will not deform or break even if saliva adheres to them. From this perspective, in this embodiment, feathers 6 are made from oriented polypropylene with a thickness of 40 μm.

[0041] A-6: Jig 10 The jig 10 is used together with the tubular member 5 in the process of forming the blades 6, and as shown in Figure 14, is configured with a tapered shaft 11 of a predetermined length and a small-diameter straight-shaft tip shaft 12 that extends coaxially and continues from the small-diameter end 11a of the tapered shaft 11.

[0042] The gradient of the tapered shaft 11 is set to an angle that approximately matches the gradient of the blade 6 to be formed, and in this embodiment is set to "approximately 1.7°." In this embodiment, the outer diameter of the small-diameter end 11a of the tapered shaft 11 is set to approximately 3 mm, the outer diameter of the large-diameter end 11b is set to approximately 13 mm, and the shaft length is set to 180 mm. Furthermore, the outer diameter of the tip shaft 12 is set to a size that allows it to be inserted into the receiving hole 5d of the tubular member 5, and is set to 1.45 mm in this embodiment. The axial length of the tip shaft 12 is set in accordance with the axial length of the tubular member 5, and is set to approximately 16 mm in this embodiment.

[0043] B: Manufacturing method of arrow 1 The method for manufacturing this arrow 1 comprises six steps, from step 1 to step 6. Each of these steps will be explained below in order.

[0044] B-1: First step 8, this first step is a step in which the tubular member 5 is fitted onto the tip shaft 12 of the jig 10 to prepare for the forming operation of the blade 6. Here, the tubular member 5 is fitted onto the tip shaft 12 of the jig 10 from the other end 5b side with a larger diameter, and is held in a state in which the end face of the other end 5b abuts against the end face 11c of the tapered shaft 11. In this held state, the outer circumferential surface of the tubular member 5 and the outer circumferential surface of the tapered shaft 11 form substantially the same tapered surface.

[0045] B-2: Second step 9, the second step is a step of forming the blade 6 using a film. First, the blade 6 having a truncated cone shape is formed by winding a film across the outer circumferential surface of the tubular member 5, which is inserted and held on the tip shaft 12 of the jig 10, and the outer circumferential surface of the tapered shaft 11 of the jig 10. In this case, the front end of the film is set to protrude axially forward by a predetermined distance beyond the end face of one end 5a of the tubular member 5. Therefore, at the tip end of the formed blade 6, i.e., inside the truncated head 6a, there is formed a space 13 which is partitioned by the inner surface of the truncated head 6a and the end face of one end 5a of the tubular member 5 and which is open outward in the axial direction.

[0046] B-3: Third step The third step is a step of impregnating the space 13 with adhesive. First, the jig 10 is removed from the state shown in FIG. 9. Then, as shown in FIG. 10, a minute space is formed spanning from the receiving hole 5d of the tubular member 5 to the space 13. Here, adhesive 7 (for example, a liquid instant adhesive) is sucked into the space 13 by capillary action. Then, the adhesive 7 accumulates in the space 13, and at the same time, the adhesive 7 also penetrates and adheres to the receiving hole 5d of the tubular member 5 and the gap between the outer surface of the tubular member 5 and the inner surface of the truncated head 6a of the blade 6 wrapped around it.

[0047] B-4: Fourth step The fourth step is to insert the cylindrical portion 4c of the connecting member 4 into the receiving hole 5d of the tubular member 5 to obtain the first arrow unit Ua. First, as shown in FIG. 11, the cylindrical portion 4c of the connecting member 4 is inserted into the receiving hole 5d of the tubular member 5, pushing aside the adhesive 7 accumulated in the space 13. The insertion is stopped and held in place when the flange 4b ​​of the connecting member 4 abuts against the truncated head 6a of the blade 6. The adhesive 7 accumulated in the space 13 adheres to the cylindrical portion 4c of the connecting member 4, and the adhesive 7 spreads thinly over a wide area of ​​the receiving hole 5d of the tubular member 5, thereby bonding the tubular member 5, the connecting member 4, and the truncated head 6a of the blade 6 together. The first arrow unit Ua is thus formed by bonding the tubular member 5, the connecting member 4, and the truncated head 6a of the blade 6 together.

[0048] In this fourth step, as shown in Figure 16, if the rear end 4d of the cylindrical portion 4c of the connecting member 4 is configured to protrude further rearward than the rear end (other end 5b) of the tubular member 5, an annular groove 14 is formed by the outer surface of the cylindrical portion 4c of the connecting member 4, the other end 5b of the tubular member 5, and the inner surface of the blade 6.By collecting adhesive 8 in this annular groove 14 and allowing it to harden, the connecting member 4, tubular member 5, and blade 6 can be fixed together with even greater strength. The adhesive can be stored in the annular groove 14 by pushing the adhesive 7 stored in the space 13 out to the other end 5b of the tubular member 5 by the rear end 4d of the cylindrical portion 4c of the connecting member 4. Alternatively, the adhesive can be injected into the annular groove 14 from the rear end 6b of the blade 6.

[0049] B-5: Fifth step The fifth step is to form the second arrow unit Ub. First, as shown in Fig. 12, the fixing portion 2b of the pin 2 is inserted into the axial hole 3c of the shaft 3, and then the two are fixed and integrated with an adhesive. In this way, the fixing portion 2b of the pin 2 is inserted into the axial hole 3c of the shaft 3 and fixed and integrated, thereby forming the second arrow unit Ub.

[0050] In this fifth step, as shown in FIG. 15, if a male thread 2c is provided on the outer peripheral surface of the cylindrical fixing portion 2b of the pin 2, the fixing portion 2b can be screwed into the axial hole 3c of the shaft 3 and the male thread 2c can be fitted into the inner peripheral surface of the axial hole 3c. This adds to the strength of the fixation provided by the adhesive, and therefore the pin 2 and the shaft 3 can be fixed together with extremely high strength.

[0051] B-6: Sixth Step The sixth step is a step of forming the arrow 1 using the first arrow unit Ua and the second arrow unit Ub. As shown in Fig. 13, the male screw shaft 4a of the connecting member 4 belonging to the first arrow unit Ua is screwed into the female screw hole 3d of the shaft 3 belonging to the second arrow unit Ub, and the first arrow unit Ua and the second arrow unit Ub are coaxially connected and integrated to obtain the arrow 1. This completes the manufacturing of the arrow 1.

[0052] By releasing the screw connection between the first arrow unit Ua and the second arrow unit Ub, the arrow 1 is separated into the first arrow unit Ua and the second arrow unit Ub.

[0053] When screwing the first arrow unit Ua and the second arrow unit Ub together or releasing the screwed state, the shaft 3 is usually held with the fingers of either the left or right hand, and the fingers of the other hand hold the vicinity of the cut head 6a of the blade 6, and twist and rotate them in opposite directions. However, when this is done, a large force is applied to the blade 6, which can cause the inner surface of the blade 6 to peel off from the outer surface 5c of the tubular member 5. However, as shown in Figure 16, if the rear end 4d of the cylindrical portion 4c of the connecting member 4 is made to protrude further rearward than the other end 5b of the tubular member 5 to form annular groove 14, and adhesive 8 is allowed to accumulate and harden in this annular groove 14, the strength of the bond between the inner circumferential surface of the blade 6 and the outer circumferential surface 5c of the tubular member 5 can be significantly increased, thereby preventing the problem of the inner circumferential surface of the blade 6 peeling off from the outer circumferential surface 5c of the tubular member 5 as described above. [Industrial Applicability]

[0054] The blowgun arrows according to the present invention are used in entertainment and sports fields such as blowgun competitions. [Explanation of symbols]

[0055] 1 Arrow 2 pins 3 Shaft 3d Female thread hole 4. Connecting member 4a Male threaded shaft 4b Flange 4c Cylindrical section 4d · Rear end 5. Tubular member 5c ···Outer surface 5d ·Hole 6 Feathers 6a · Cutting head 6b · Rear end 7. Adhesive 8. Adhesive 10 Jig 11 Tapered shaft 11a...end 11c...End face 12 ·Tip shaft 13 · Spatial part 14 Annular groove Ua 1st Arrow Unit Ub Second Arrow Unit

Claims

1. a pin having a tip portion and a fixing portion extending rearward from the tip portion; A blade formed by winding a film into a truncated cone shape; a rod-shaped shaft having a predetermined length, the shaft having an axial hole at its front end on its axis center and an internally threaded hole or an externally threaded shaft at its rear end; a connecting member that is a rod-shaped body of a predetermined length, and that has a male screw shaft or a female screw hole at the front end side on its axis center and a cylindrical portion at the rear end side; a tubular member having a predetermined length, the inner circumferential surface of which serves as a receiving hole for the cylindrical portion of the connecting member; The tubular member is disposed on the inner surface side of the truncated portion of the blade, and the cylindrical portion of the connecting member is inserted into the receiving hole of the tubular member so that the rear end of the cylindrical portion protrudes rearward beyond the rear end of the tubular member, thereby forming an annular groove consisting of the outer circumferential surface of the cylindrical portion, the rear end of the tubular member, and the inner circumferential surface of the blade. An adhesive is pooled in the annular groove and hardened to fix and integrate the blade, the tubular member, and the connecting member, thereby forming a first arrow unit. The second arrow unit is configured by inserting the fixing portion of the pin into the axial hole of the shaft, and fixing and integrating the shaft and the pin, The first arrow unit and the second arrow unit can be connected and separated by screwing or unscrewing the male screw shaft or the female screw hole of the connecting member on the first arrow unit side into the female screw hole or the male screw shaft of the shaft on the second arrow unit side.

2. In the blowgun arrow according to claim 1, The arrow for a blowgun is characterized in that the outer surface of the tubular member is a tapered surface having a gradient that approximately matches the expansion angle of the feathers.

3. In the blowgun arrow according to claim 1 or 2, A blowgun arrow characterized in that the fixing portion of the pin is formed in a cylindrical shape and a male screw is provided on part or the entire outer surface of the fixing portion.

4. A method for manufacturing an arrow for a blowgun according to any one of claims 1 to 3, a first step of inserting and holding a tubular member of a predetermined length into a parallel shaft portion of a jig, the parallel shaft portion of the jig including a tapered shaft portion having an outer circumferential surface tapered at a predetermined gradient and a small-diameter end of the tapered shaft portion extending coaxially therefrom; a second step of wrapping a film around the outer peripheral surface of the tapered shaft portion of the jig so as to enclose the tubular member, thereby forming a frusto-conical blade; a third step of impregnating the blade with adhesive from the cut-off portion side of the blade after removing the jig from the tubular member and the blade side; a fourth step of inserting the cylindrical portion of the connecting member into the inner peripheral portion of the tubular member from the front end side thereof, and fixing the blade, the tubular member, and the connecting member together with the adhesive to obtain a first arrow unit; A fifth step of fixing the fixing portion of the pin to the axial hole on the front end side of the shaft to obtain a second arrow unit; A sixth step of coaxially connecting the front end of the connecting member on the first arrow unit side to the rear end of the shaft on the second arrow unit side to obtain an arrow for a blowgun; A method for manufacturing arrows for blowguns, comprising:

Images