JP2014074527A - Arrowhead and arrow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new arrowhead which can be easily attached to/detached from a body part of an arrow and which reduces a burden imposed on the body part in attachment/detachment or during a competition, and the arrow to which the arrowhead is attached.SOLUTION: An arrowhead, which enables an arrowhead base 2 and an arrowhead body 3 to be connected together, is used as an arrowhead 1. The arrowhead base 2 is inserted into a body part 11 of an arrow and fixed in the state of being internally fitted into the tip of the body part 11. Additionally, the arrowhead body 3 is connected to the arrowhead base 2 so that the arrowhead 1 can be attached to the tip of the body part 11.

Description

  The present invention relates to an arrowhead mounted on the tip of an arrow fired by a bow, and an arrow formed by mounting the arrowhead.

  A bow and arrow, which uses the elasticity of a bow to launch an arrow as a flying object, was originally developed as a hunting tool or a combat weapon. It is used as a competition tool for competing to shoot more accurately. The use of the bow and arrow in this competition has been developed mainly in the West as “archery” and has now been adopted as an official Olympic event. On the other hand, in Japan, it is called “Yudo (or Japanese archery)” and is familiar as one of the traditional Japanese martial arts alongside judo and kendo.

  By the way, the arrow used in the archery has an arrowhead (尻) attached to the tip of a rod-like body portion called “箆 (no)” and an arrowhead attached to the end, and a plurality of arrows along the body portion. A structure in which a plurality of arrow blades are attached (an arrow used in the archery has a structure substantially similar to an arrow used in the archery, and a portion corresponding to the body portion is a shaft. The portion corresponding to the arrowhead is referred to as a point, the portion corresponding to the arrowhead is knocked, and the portion corresponding to the arrow feather is referred to as Vain).

  Conventionally, the body portion has been made of bamboo, but recently, it has become common to process geralumin or carbon fiber reinforced plastic into a pipe shape.

  The arrowhead is a part that counts on the bowstring, and was formed by cutting in the end of the body part in the old days. At present, a part called “cage” formed of beast horn or plastic is attached to the end of the body part to form the arrowhead.

  The arrow feathers are made by splitting the wings of various birds such as eagle, falcon, swan, turkey, chicken, duck, etc. in the vertical half. It is attached to the peripheral wall. In “archery” as a competition, three arrowheads are conveniently attached with a phase difference of 120 degrees. Since the bird wings have two sides, if you divide the bird wings to make an arrow feather, you can create two types of arrow feathers with different bending directions. When the end of the arrow (the arrowhead side) is viewed, the three arrow feathers are all turned counterclockwise. Otoya is the one whose direction is all clockwise. During the flight, the arrow rotates clockwise and the Oya rotates counterclockwise.

  The arrowhead is a metal fitting that is attached to the front end of the body part in order to increase the penetrating force of the arrow and protect the body part. The arrowhead is roughly divided into two types: an exterior type that covers the front end of the body part, and an internal type that is inserted at the front end of the body part. Yajiri is the mainstream.

  This exterior-type arrowhead has a structure that is sharpened toward one end and provided with a cylindrical concave hole having a certain depth on the other end side. When mounting the exterior arrowhead to the front end of the body part, the opening of the recessed hole is applied to the front end of the body part, and then the arrowhead is struck against the ground so that the front end of the body part is recessed. Do it by pushing it into the hole.

  Recently, the exterior-type arrowhead can be quickly attached to the body part, and is difficult to remove easily after attachment, with respect to the inner wall of the recessed hole from the opening end to the bottom part. A taper process that gradually decreases the inner diameter has been developed (see, for example, Patent Document 1 below).

JP 2009-41896 A

  By the way, the arrowhead also plays a role as a weight for maintaining the balance (flying posture) of the flying arrows, depending on the physique and physical strength of the athlete (shooter), the distance to the target, the strength of the wind, etc. It is preferred to use arrowheads with different weights.

  On the other hand, since the arrowhead existing at the tip of the arrow is worn or chipped by repeated piercing, if the wear or chipping occurs at the arrowhead, the balance of the arrows is out of order. Therefore, it is necessary to replace the arrowhead with a new one at a certain frequency of use.

  However, the exterior arrowhead mounted by pushing the front end of the body portion into the concave hole damages the front end of the body portion every time it is replaced. Damage or breakage may occur. In addition, the arrow with the external arrowhead attached has the strongest stress on the portion where the other end edge of the arrowhead (opening edge of the recessed hole) is located in the body portion at the moment of being pierced. Therefore, there is a tendency that cracks and cracks of the body portion are likely to occur at such sites during competition.

  Since the arrowhead itself is premised on replacement at a certain frequency of use, it is commercially available at a low price. However, the body is often relatively expensive. Therefore, the damage of the trunk portion gives a considerable financial burden to the player.

  The present invention has been completed in view of the above technical problem, and is easy to attach and detach to and from the body of the arrow, and is a novel design that reduces the burden imposed on the body during attachment and detachment and during competitions. An object is to provide an arrowhead and an arrow to which the arrowhead is attached.

  In order to solve the above technical problem, the arrowhead of the present invention is an arrowhead attached to the tip of a pipe-shaped body part of an arrow fired by a bow, and is provided with a columnar insertion part at one end. And a base-side member provided at the other end of the arrowhead base, wherein the arrowhead base and the arrowhead main body are provided at the other end of the arrowhead base. It is made connectable by engagement between a joint portion and a main body side engaging portion provided at the other end of the arrowhead main body, and the arrowhead base is inserted into the body portion from the fitting insertion portion side. In a state where a part or all of the insertion part is internally provided at the front end of the body part, the outer peripheral surface of the insertion part provided at the front end of the body part is in contact with the inner peripheral surface of the body part. In this state, it is fixed to the body part, and the base side engaging part and the main body side engaging part are engaged. It is in, by the arrowhead body is connected to the arrowhead base, characterized in that intended to be attached to the distal end of the body portion (hereinafter, referred to as "the present invention arrowhead".).

  In the arrowhead of the present invention, the base side engaging portion is a male screw or a female screw, and the main body side engaging portion is a female screw or a male screw that can be screwed to the base side engaging portion. Is a preferred embodiment.

  In the arrowhead of the present invention, the other end of the arrowhead main body is further provided with a cylindrical skirt portion having a virtual extension line of the axis of the arrowhead main body as an axis, and is attached to the tip of the trunk portion. In this state, a part or all of the skirt portion is externally attached to the front end of the body portion, and the inner peripheral surface of the skirt portion externally attached to the front end of the body portion is the outer peripheral surface of the body portion. What is fixed to the front end of the body portion in a state of being in contact with is a preferable aspect.

  The arrowhead of the present invention further comprises a weight member, and the weight member and the arrowhead base are an insertion portion side engagement portion provided at a free end of the insertion portion, and the weight member. What became possible to connect by engagement with the weight member side 1st engaging part provided in the end of this is a preferable aspect.

  The arrowhead of the present invention comprises a plurality of the weight members, wherein one weight member and the other weight member are a weight member side first engagement portion provided at one end of the one weight member, and the other What became possible to connect by engagement with the weight member side 2nd engaging part provided in the other end of this weight member becomes a preferable aspect.

  In the present invention arrowhead, a preferred embodiment is one in which one or more spiral grooves are provided along the outer peripheral surface of the arrowhead main body.

  In the present invention, a preferred embodiment is one in which the spiral groove is provided in three rows with a phase difference of 120 degrees.

  In the present invention arrowhead, a preferred embodiment is one in which the spiral angle of the spiral groove is within a range of 20 ± 5 degrees.

  The arrow of the present invention is characterized in that the arrowhead of the present invention is mounted.

  According to the present invention, the arrow can be easily attached to and detached from the body part, and the burden applied to the body part during attachment and detachment or during competition is reduced.

FIG. 1 (a) is a perspective view showing the arrowhead of the present invention according to Embodiment 1, and FIG. 1 (b) is a plan view showing the arrow of the present invention to which the arrowhead of the present invention is attached. 1 (c) is an enlarged cross-sectional view of the tip end portion (AA portion) of the arrow of the present invention. FIG. 2A is a perspective view showing a state in which the arrowhead base in the arrowhead of the present invention is inserted into the body part, and FIG. 2B is a state in which the arrowhead base is fixed to the body part. FIG. 2C is a perspective view showing a state in which the arrowhead main body and the arrowhead base in the arrowhead of the present invention are connected to each other. FIG. 3A is a perspective view showing the arrowhead of the present invention according to Embodiment 2, and FIG. 3B is a plan view showing the arrow of the present invention to which the arrowhead of the present invention is attached. 3 (c) is an enlarged cross-sectional view of the tip portion (AA portion) of the arrow of the present invention. FIG. 4A is a perspective view showing a state in which the arrowhead base and the weight member in the arrowhead of the present invention are connected, and FIG. 4B shows the body of the arrowhead base to which the weight member is connected. It is a perspective view which shows a mode that it inserts into a part, and FIG.4 (c) is a perspective view which shows a mode that the arrowhead main body and the arrowhead base in the said arrowhead of this invention are connected. FIG. 5A is a perspective view showing the arrowhead of the present invention according to Embodiment 3, and FIG. 5B is a plan view showing the arrow of the present invention to which the arrowhead of the present invention is attached. 5 (c) is an enlarged cross-sectional view of the tip portion (AA portion) of the arrow of the present invention. FIG. 6 is a plan view of the arrow of the present invention as viewed from the tip side.

  Hereinafter, although an embodiment of the present invention is described based on a drawing, the present invention is not limited to this embodiment.

<Embodiment 1>
[Invention Yajiri 1]
FIG. 1A shows an embodiment of the arrowhead 1 of the present invention. As shown in FIGS. 1B and 1C, the present invention arrowhead 1 is attached to the tip of a pipe-shaped body portion 11 in the arrow 10 of the present invention, and includes an arrowhead base 2 and an arrowhead main body 3. And.

  The arrowhead base 2 is provided with a columnar insertion portion 21 at one end and a base side engaging portion 22 at the other end. The outer diameter (D1) of the fitting part 21 is the same as or slightly smaller than the inner diameter of the body part 11. The length (L1) of the insertion portion 21 is 6.5 mm. The base side engaging portion 22 is a male screw having a constant shaft diameter (φ1), and the shaft center thereof is provided at a position coincident with the shaft center of the fitting insertion portion 21. The arrowhead base 2 is made of brass, and is integrally formed with the base-side engaging portion 22 provided directly on the end surface of the fitting insertion portion 21.

  The arrowhead main body 3 is sharpened toward one end, and a main body side engaging portion 32 is provided at the other end. In the present embodiment, the arrowhead body 3 is made of brass, and is the thickest part so that the tip of the body 11 can be protected when attached to the tip of the body 11 in the arrow 10 of the present invention. The outer diameter (D2) on the (other end side) is the same as or slightly larger than the outer diameter of the body portion 11. The main body side engaging portion 32 is a female screw having a constant nominal diameter (φ2), and its axial center is provided at a position that coincides with the axial center of the arrowhead main body 3.

  The base side engaging portion 22 and the main body side engaging portion 32 can be engaged (screwed) with each other. Therefore, the arrowhead base 2 and the arrowhead main body 3 are connected to the base. The side engaging portion 22 and the main body side engaging portion 32 can be connected by engagement.

[Arrow 10 of the present invention]
The arrow 10 of the present invention shown in FIG. 1 (b) has the present invention arrowhead 1 attached to the tip of the body part 11 and an arrowhead 12 attached to the end, and a plurality of sheets along the body part 11. It has a structure with an arrow 13 attached.

  In mounting the arrowhead 1 of the present invention on the tip of the body part 11, the arrowhead base 2 in the arrowhead 1 of the present invention is fixed to the body part 11, and the arrowhead base 2 and the arrowhead are fixed. The main body 3 is connected.

  In fixing the arrowhead base 2 to the body portion 11, as shown in FIG. 2A, the arrowhead base 2 is moved toward the distal end of the body portion 11 and the fitting insertion portion 21. Insert from the side. In the present embodiment, the fitting insertion portion 21 is inserted into the trunk portion 11 until the end surface of the fitting insertion portion 21 is flush with the leading edge of the trunk portion 11. Accordingly, the state in which the fitting insertion portion 21 is internally provided at the front end of the body portion 11, and the outer peripheral surface of the fitting insertion portion 21 provided at the front end of the body portion 11 is the inner peripheral surface of the body portion 11. The arrowhead base 2 is fixed with respect to the body part 11 in a state in contact with (see FIG. 2B).

  Next, in connecting the arrowhead base 2 fixed to the body part 11 and the arrowhead main body 3, the base provided on the arrowhead base 2 as shown in FIG. The side engaging portion 22 and the main body side engaging portion 32 provided on the arrowhead main body 3 are engaged (screwed together). Thereby, the arrowhead main body 3 is fastened to the arrowhead base 2 fixed to the trunk portion 11.

  The arrow 10 of the present invention created by such a process does not give particularly excessive stress deformation to the body part 11 when the arrowhead base 2 is fixed to the body part 11. In addition, when the arrowhead base 2 and the arrowhead main body 3 are connected to each other, stress is not applied to the body portion 11 to the extent that it can be said at all.

  In the arrow 10 of the present invention, most of the stress generated at the moment of being pierced by a bow is a portion that connects the arrowhead base 2 and the arrowhead main body (in this embodiment, a male Since the stress applied to the body part 11 is reduced as much as possible by being applied to the base side engaging part 22) formed as a screw, the body part 11 is damaged such as cracks and chips. Is unlikely to occur.

  Further, when the arrowhead main body 2 forming the outer shell of the present invention arrowhead 1 is worn or chipped, only the arrowhead main body 2 may be replaced with a new one. Since it is only necessary to connect the base 2 and the arrowhead body 3, it can be performed very quickly. Even at the time of this replacement work, no stress is applied to the body portion 11 as much as possible.

  On the other hand, in the arrowhead base 2, when the base side engaging portion 22 is broken or the like is broken, it is necessary to replace the damaged arrowhead base 2, Since it is only necessary to pull out the damaged arrowhead base 2 from the body 11 and insert and fix the new arrowhead base 2, it can be performed very quickly. Even during the replacement work, excessive deformation stress is not applied to the body portion 11.

  In addition, the arrowhead 1 of the present invention has a state in which the fitting insertion portion 21 formed in a columnar shape is provided at the tip of the body portion 11 and the insertion insertion portion 21 provided at the tip of the body portion 11. In the state where the outer peripheral surface is in contact with the inner peripheral surface of the body part 11, the arrowhead base 2 is fixed to the body part 11, and the arrowhead body 2 is fixed to the arrowhead base 2. Since it is connected to each other, the axial center of the body portion 11 and the arrowhead of the present invention, which are very difficult to achieve with a conventional exterior arrowhead mounted by being forcedly pushed into the tip of the body portion, The coincidence (centering) of the axis 1 (the center of the arrowhead base 2 and the axis of the arrowhead main body 3) can be easily realized with considerable accuracy.

  In the present embodiment, the outer diameter (D1) of the insertion part 21 in the arrowhead body 2 is the same as or slightly smaller than the inner diameter of the body part 11. The outer diameter (D1) is preferably 0.9 to 1 times (preferably 0.95 to 0.99 times) the inner diameter of the body portion 11.

  In the present embodiment, the length (L1) of the insertion portion 21 in the arrowhead body 2 is 6.5 mm, but the length (L1) of the insertion portion 21 is particularly limited. It is not something. The length (L1) of the insertion part 21 is preferably 3 to 20 mm (more preferably 5 to 10 mm).

  Furthermore, in the present embodiment, when the fitting insertion portion 21 is internally provided at the front end of the body portion 11, the body portion is moved to a position where the end surface of the fitting insertion portion 21 is flush with the front end surface of the body portion 11. 11, the insertion part 21 is inserted, but the end surface of the insertion part 21 protrudes from the front end surface of the body part 11, or the end surface of the insertion part 21 is the end part of the body part 11. It is good also as a state which exists in the position deeper than the front end surface. The insertion depth of the fitting insertion part 21 into the body part 11 is preferably 3 to 20 mm (more preferably 5 to 10 mm).

  By the way, in this embodiment, in fixing the arrowhead base 2 to the body part 11, the use of an adhesive or an adhesive was not mentioned. In order to more securely fix the body part 11, it is preferable to interpose an adhesive or an adhesive between the outer peripheral surface of the fitting part 21 and the inner peripheral surface of the body part 11. That is, in the present invention, the “contact state” does not mean only a state in which the outer peripheral surface of the fitting portion 21 and the inner peripheral surface of the body portion 11 are in direct surface contact, The state where the outer peripheral surface of the fitting part 21 and the inner peripheral surface of the body part 11 are close to each other and an adhesive or an adhesive is interposed between the inner peripheral surface of the body part 11 is also included. At this time, one or more outer peripheral surfaces of the insertion portion 21 are arranged on the outer peripheral surface of the insertion portion 21 so that an adhesive or an adhesive is easily interposed between the outer peripheral surface of the insertion portion 21 and the inner peripheral surface of the body portion 11. A concave groove or a concave hole may be provided. In addition, as said adhesive agent or adhesive, it is preferable to use the hot-melt type thing which has a property which recovers fluidity | liquidity by heating. If a hot-melt adhesive or pressure-sensitive adhesive is used, only the portion of the body portion 11 in which the arrowhead base 2 is installed is heated from the outer peripheral surface side during the replacement operation, and the arrowhead base is removed from the body portion 11. The table 2 can be easily extracted.

  In the present embodiment, the base side engaging portion 22 of the arrowhead base 2 is a male screw, and the main body side engaging portion 22 of the arrowhead main body 3 is a female screw. Alternatively, the base side engaging portion 22 may be a female screw, and the main body side engaging portion 22 may be a male screw. In addition, in the case of selecting one by screwing a male screw and a female screw as a means for connecting the arrowhead base 2 and the arrowhead main body 3, the moment when the arrow 10 of the present invention is pierced, Since the load is most applied to the shaft portion of the male screw, the shaft diameter of the male screw is preferably as large as possible. Specifically, the shaft diameter of the male screw is 0.3 to 0.9 times (more preferably 0.5 times or more) the outer diameter (D1) of the fitting insertion portion 21. preferable.

  Of course, in the present invention, the means for connecting the arrowhead base 2 and the arrowhead main body 3 is not necessarily limited to screwing between a male screw and a female screw. For example, the base-side engaging portion 22 in the arrowhead base 2 is a claw, and the body-side engaging portion 22 in the arrowhead main body 3 is a receiving portion that can lock the claw, and the claw is the receiving portion. The arrowhead base 2 and the arrowhead main body 3 may be connected to each other by being engaged with each other.

  By the way, in this embodiment, in producing the arrow 10 of the present invention, after the arrowhead base 2 is fixed to the body part 11, the arrowhead base 2 fixed to the body part 11, and Although the arrowhead main body 3 is connected, the arrowhead base 2 and the arrowhead main body 3 may be connected in advance and the arrowhead base 2 may be fixed to the body portion 11 in advance.

  Furthermore, in this embodiment, brass is used as the material of the present invention arrowhead 1 (the arrowhead base 2 and the arrowhead body 3), but the material of the present invention arrowhead 1 is not particularly limited. The present invention arrowhead 1 can be manufactured based on a material appropriately selected from various materials such as plastic and ceramic in addition to a metal material.

  In particular, for the arrowhead body 3 that can be easily replaced, various types of materials made of different materials such as iron, aluminum, tungsten, titanium, nickel, lead, copper, or alloys are prepared. If this is the case, it is possible to select the one having the most suitable weight from the various arrowhead main bodies 3 according to the distance to the target, the strength of the wind, and the like, and to quickly replace and use them.

  In addition, in the arrow 10 of the present invention, it is preferable to form a metal as a material for the body portion 11. In the present invention arrowhead 1, the dimensions of each part are determined according to the inner diameter dimension and the outer diameter dimension of the body part 11, and it is desirable that the dimensions of the body part 11 have considerable accuracy. . Therefore, in the arrow 10 of the present invention, it is preferable that the body portion 11 is made of a metal that can easily realize an accurate dimension as a material. As the metal, it is preferable to use a light metal such as aluminum or an aluminum alloy.

  In addition, in this embodiment, the thing for archery is illustrated about the arrow 10 of this invention, However, The thing used for the arrow 10 of this invention when this invention arrowhead 1 is mounted | worn is a thing for archery For example, an archery arrow may be used.

<Embodiment 2>
[Invention Yajiri 1]
FIG. 3 (a) shows another embodiment of the arrowhead 1 of the present invention. As shown in FIGS. 3B and 3C, the present invention arrowhead 1 is attached to the tip of the pipe-shaped body portion 11 of the arrow 10 of the present invention, and includes an arrowhead base 2 and an arrowhead main body 3. And a weight member 4. In the present embodiment, the arrowhead base 2, the arrowhead main body 3, and the weight member 4 are all made of an aluminum alloy.

  In the present embodiment, the arrowhead base 2 includes a flange portion 23 interposed between the fitting insertion portion 21 and the base-side engaging portion 22, and a free end of the fitting insertion portion 21. The end of the second embodiment) is provided with a notch groove 24 and a fitting insertion portion side engagement portion 25 in an end portion 211 opposite to the side on which the base side engagement portion 22 exists. Unlike the base 2, it is common in other points.

  The flange portion 23 has a disk shape, and an outer diameter (D3) thereof is set to be larger than the inner diameter of the body portion 11 and equal to or smaller than the outer diameter of the body portion 11. The

  The notch groove 24 is a concave groove having a constant width provided so as to pass through the center of the circular free end surface of the fitting insertion portion 21.

  The fitting insertion portion side engaging portion 25 is a female screw, and is provided at a position where the axial center thereof coincides with the axial center of the fitting insertion portion 21.

  The arrowhead body 3 in this embodiment differs from the arrowhead body 3 of the first embodiment in that the skirt portion 33 is provided, and is common in other respects.

  The skirt portion 33 has a cylindrical shape, the virtual extension line (X) of the axial center of the arrowhead main body 3 is aligned with the axial center, and the peripheral wall thereof is the outer peripheral wall of the arrowhead main body 3. It is arranged in the state extended along. The inner diameter (D4) of the skirt portion 33 is set to be the same as or slightly larger than the outer diameter of the body portion 11 (1.0 to 1.1 times (preferably 1.0 to 1.05 times)). Is done.

  The present invention arrowhead 1 in this embodiment further includes the weight member 4 in addition to the arrowhead base 2 and the arrowhead main body 3.

  The weight member 4 has a cylindrical outer shell shape. A weight member side first engagement portion 41 is provided at one end, and a weight member side second engagement portion 42 is provided at the other end. ing. A cylindrical outer shell shape of the weight member is set to be narrower than the fitting insertion portion 21 of the arrowhead base 2.

  In the present embodiment, the weight member side first engaging portion 41 is a male screw, and the axis thereof is provided at a position that coincides with the cylindrical outer shell axis of the weight member 4. . On the other hand, the weight member side second engaging portion 42 is formed as a female screw, and its axial center is provided at a position that coincides with the cylindrical outer shell axial center of the weight member 4.

  A cutout groove 43 is provided on the other end surface of the weight member 4. The notch groove 43 is a concave groove having a constant width provided so as to pass through the center of the other end surface of the circular shape of the weight member 4.

  The fitting portion side engaging portion 25 and the weight member side first engaging portion 41 can be engaged (screwed) with each other. Therefore, the arrowhead base 2 and the weight member 4 are The engagement is possible by engagement between the fitting insertion portion side engaging portion 25 and the weight member side first engaging portion 41. Of course, the arrowhead base 2 and the arrowhead main body 3 are connectable by engagement (screwing) of the base side engaging portion 22 and the main body side engaging portion 32.

[Arrow 10 of the present invention]
The arrow 10 of the present invention shown in FIG. 3B has the arrowhead 1 attached to the tip of the body part 11 and an arrowhead 12 attached to the end, and a plurality of sheets along the body part 11. It has a structure with an arrow 13 attached.

  In mounting the arrowhead 1 of the present invention on the tip of the body portion 11, the arrowhead base 2 and the weight member 4 in the arrowhead 1 of the present invention are connected to each other, and the arrowhead base is connected to the body portion 11. 2 is fixed, and the arrowhead base 2 fixed to the body portion 11 and the arrowhead main body 3 are connected.

  When connecting the arrowhead base 2 and the weight member 4, as shown in FIG. 4A, the fitting insertion portion side engaging portion 25 provided on the arrowhead base 2 and the weight member 4 is engaged (screwed) with the weight member side first engaging portion 41 provided on the base plate 4. In this embodiment, at the time of this work, the weight member 4 can be rotated by applying the tip of a flathead screwdriver to the notch groove 43 provided at the other end of the weight member 4 ( The notch groove 24 provided in the arrowhead base 2 is also provided so that it can be rotated by a flat-blade screwdriver).

  In fixing the arrowhead base 2 to which the weight member 4 is connected to the body portion 11, the arrowhead base 2 is attached to the tip of the body portion 11 as shown in FIG. 4 (b). The weight member 4 is inserted from the side of the fitting insertion portion 21 with the weight member 4 first. In the present embodiment, the fitting insertion portion 21 is inserted until the flange portion 23 provided on the arrowhead base 2 contacts the tip of the body portion 11. Accordingly, the state in which the fitting insertion portion 21 is internally provided at the front end of the body portion 11, and the outer peripheral surface of the fitting insertion portion 21 provided at the front end of the body portion 11 is the inner peripheral surface of the body portion 11. The arrowhead base 2 is fixed with respect to the body part 11 in a state in contact with the body part 11.

  Next, in connecting the arrowhead base 2 fixed to the body part 11 and the arrowhead main body 3, the base provided on the arrowhead base 2 as shown in FIG. The side engaging portion 22 and the main body side engaging portion 32 provided on the arrowhead main body 3 are engaged (screwed together). Thereby, the arrowhead main body 3 is fastened to the arrowhead base 2 fixed to the trunk portion 11.

  As shown in FIG. 3C, when the arrowhead base 2 and the arrowhead body 3 are connected, a part (or all) of the skirt portion 33 provided on the arrowhead body 3 is A state where the outer peripheral surface of the body part 11 is in contact with the outer peripheral surface of the body part 11, and a state where the inner peripheral surface of the skirt part 33 is mounted on the front end of the body part 11.

  The arrow 10 of the present invention created in such a process is such that the outer peripheral surface of the fitting insertion portion 21 of the arrowhead base 2 is in contact with the inner peripheral surface of the trunk portion 11, while the outer periphery of the trunk portion 11 is The inner peripheral surface of the skirt portion 33 of the arrowhead body 3 is in contact with the surface, and the front end of the body portion 11 is protected from both the inner peripheral surface side and the outer peripheral surface side. Therefore, the arrow 10 of the present invention according to the present embodiment has a very high physical strength against the load received when it is pierced.

  In addition, since the arrowhead 1 of the present invention is provided with the flange portion 23 in the arrowhead base 2, when the arrowhead base 2 is fixed to the body portion 11, positioning of the insertion depth is determined. Has been made very easy.

  Furthermore, since the present invention arrowhead 1 can be connected to the weight member 4 with respect to the arrowhead base 2, the weight of the present arrowhead 1 is adjusted by attaching and detaching the weight member 4. It is possible. The weight member 4 is engaged (screwed) with the weight member-side first coupling portion 41 at the other end so that the other weight member 4 can be connected to the one weight member 4. A weight member-side second engagement portion 42 that is made possible is provided. Thus, by changing the number of weight members 4 connected to the arrowhead base 2, the weight balance of the arrow 10 of the present invention is appropriately adjusted according to the distance to the target and the strength of the wind. Will be able to.

  In addition, in the present invention arrowhead 1 that can increase and decrease the weight according to the number of connected weight members 4 as in this embodiment, the arrowhead body 3 is made of a light metal such as aluminum or aluminum alloy. It is preferable to form. The reason for this is that the present invention arrowhead 1 in the present embodiment is configured such that the weight balance of the present invention arrow 10 can be appropriately adjusted by the number of connections of the weight members 4. If the weight of the weight member 4 is too large, even if the number of connected weight members 4 is changed, the weight balance of the arrow 10 of the present invention may not be affected. In addition, the arrowhead body 3 is worn or chipped by repeatedly piercing the target. However, if the weight of the arrowhead body 3 is too large, the weight of the arrowhead body 3 is reduced due to wear or chipping. In some cases, the width becomes large, and a desired weight balance cannot be maintained in a short period of time.

  Therefore, in the arrowhead 1 according to the present invention, the weight of which can be increased or decreased depending on the number of connected weight members 4, a light metal such as aluminum is formed as a material for the arrowhead body 3, It is preferable that the weight balance of the arrow 10 of the present invention can be adjusted based on the number of connections, and that the weight balance is not greatly affected by some wear of the arrowhead body 3.

  The rest is the same as that described in the first embodiment, and the description is omitted here to avoid repetition.

<Embodiment 3>
[Invention Yajiri 1]
FIG. 5A shows still another embodiment of the arrowhead 1 of the present invention. As shown in FIGS. 5 (b) and 5 (c), the present invention arrowhead 1 is attached to the tip of the pipe-shaped body portion 11 in the arrow 10 of the present invention, and includes an arrowhead base 2 and an arrowhead main body 3. And a weight member 4.

  The arrowhead base 2 in the present embodiment is the same as the arrowhead base 2 of the second embodiment.

  The arrowhead body 3 in this embodiment is different from the arrowhead body 3 of the second embodiment in that a plurality of spiral grooves 31 are provided along the outer peripheral surface, and is common in other respects.

  The spiral groove 31 is a groove carved so as to draw a spiral from one end of the arrowhead main body 3 toward the other end, and most of the spiral groove 31 is a sharpened portion (tapered portion) of the arrowhead main body 3. Exist. In this embodiment, the spiral groove 31 is provided with three stripes with a phase difference of 120 degrees, and the spiral angle (θ) of each spiral groove 31 is 20 degrees. Further, the twisting direction of the three spiral grooves 31 is clockwise when viewed from one end side of the arrowhead body 3.

  The weight member 4 in the present embodiment is the same as the weight member 4 in the second embodiment.

[Arrow 10 of the present invention]
The arrow 10 of the present invention shown in FIG. 5 (b) has the present invention arrowhead 1 attached to the tip of the body portion 11 and an arrowhead 12 attached to the end, and a plurality of sheets along the body portion 11. It has a structure with an arrow 13 attached.

  In mounting the arrowhead 1 of the present invention on the tip of the body portion 11, a process similar to the process described in the second embodiment may be performed.

  Here, the present invention arrowhead 1 according to the present embodiment receives air resistance along the spiral groove 31 carved in the outer peripheral surface of the arrowhead body 3 when the arrow 10 of the present invention flies, A rotational force with the axis as the center of rotation is applied to the arrow 10 of the present invention. Therefore, it is necessary to select the arrow 13 in the arrow 10 of the present invention that gives the rotation in the same direction as the rotation applied to the arrow 10 of the present invention by the arrowhead 1 of the present invention.

  More specifically, as shown in FIG. 6, in the present embodiment, the spiral groove 31 carved on the outer peripheral surface of the arrowhead body 3 has one end side of the arrowhead body 3 (the arrow 10 of the present invention). Since the twist is imparted in the clockwise direction as viewed from the front end side, it is necessary to select the arrow feather 13 that is curved in this direction (that is, the book) It is necessary to use the arrow 10 of the invention as an arrow.)

  When the arrow 10 of the present invention according to the present embodiment is fired with a bow and the stability at the time of flight and the target accuracy are confirmed, the book according to the second embodiment in which the spiral groove 31 is not engraved. Compared to the arrow 10 of the invention, it has been confirmed that the flight is very stable and the hit rate is considerably improved. For reference, the spiral groove 31 improves the flight stability and accuracy as well as the arrowhead 1 of the present invention including the arrowhead base 2 and the arrowhead main body 3 as well as the related art. It has been confirmed that this is an effect that can occur even when the same spiral groove 31 is engraved with respect to the exterior or interior arrowhead.

  By the way, in the present embodiment, three spiral grooves 31 are provided for the spiral groove 31 with a phase difference of 120 degrees. However, as the number of the spiral grooves 31 is increased, the arrow 10 according to the present invention is flying. It has been confirmed that the number of rotations increases. However, as in the present embodiment, in the arrow 10 of the present invention to which the three arrow blades 13 are attached, the application of rotational force to the tip of the arrow 10 of the present invention by the spiral groove 31; It is preferable to provide three strips with a phase difference of 120 degrees for the spiral groove 31 so that the rotational force applied to the end of the arrow by the arrow blades 13 is synchronized.

  Further, in this embodiment, a spiral angle of 20 degrees is given to the spiral groove 31, but the spiral angle of the spiral groove 31 is larger when the arrow 10 of the present invention is flying. It has been confirmed that the rotational speed increases. However, as in the present embodiment, in the arrow 10 of the present invention to which the three arrow blades 13 are attached, the application of rotational force to the tip of the arrow 10 of the present invention by the spiral groove 31; It is preferable that the spiral angle of the spiral groove 31 is within a range of 20 ± 5 degrees (preferably 20 ± 3 degrees) so that the application of the rotational force to the arrow end by the arrow 13 is synchronized. .

  In the present embodiment, the spiral groove 31 is twisted in the clockwise direction when viewed from one end side of the arrowhead body 3 (the tip side of the arrow 10 of the present invention). The arrow 13 is selected to be curved in such a direction, and thus the arrow 10 of the present invention is used as the arrow, but the spiral groove 31 is viewed from one end side of the arrowhead body 3. In the case where twist is applied in the counterclockwise direction, the arrow feather 13 that is curved in this direction is selected, and the arrow 10 of the present invention should be used as the second arrow. Needless to say.

  The remainder is the same as the matter described in the first embodiment or the second embodiment, and the description is omitted here to avoid repetition.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

1 Present invention Yajiri (Yajiri)
2 Yajiri base 21 Insertion part 211 Free end 22 Base side engagement part 23 Flange part 24 Notch groove 25 Insertion part side engagement part 3 Arrowhead body 31 Spiral groove 32 Body side engagement part 33 Skirt part 4 Weight Member 41 Weight member side first engagement portion 42 Weight member side second engagement portion 43 Notch groove 10 Arrow 11 Body portion 12 Arrowhead 13 Arrow feather

Claims (9)

An arrowhead attached to the tip of the pipe-shaped body part of the arrow fired by the bow,
Yajiri base provided with a cylindrical fitting insertion part at one end;
Yajiri body sharpened toward one end,
Comprising
The arrowhead base and the arrowhead main body are engaged by a base side engaging portion provided at the other end of the arrowhead base and a main body side engaging portion provided at the other end of the arrowhead base. Become connectable,
The arrowhead base is inserted into the body part from the side of the insertion part, and a part or all of the insertion part is internally provided at the front end of the body part, and is provided at the front end of the body part. In the state where the outer peripheral surface of the inserted insertion portion is in contact with the inner peripheral surface of the body portion, it is fixed to the body portion,
By engaging the base side engaging portion and the main body side engaging portion, and connecting the arrowhead main body to the arrowhead base,
An arrowhead characterized by being attached to the tip of the body part. In the arrowhead according to claim 1,
The base side engaging portion is a male screw or a female screw,
An arrowhead in which the main body side engaging portion is a female screw or a male screw that can be screwed to the base side engaging portion. In the arrowhead according to claim 1 or 2,
The other end of the arrowhead body is further provided with a cylindrical skirt portion arranged with the virtual extension line of the axis of the arrowhead body as the axis,
A state in which a part or all of the skirt portion is externally mounted on the front end of the body portion when mounted on the front end of the body portion, and an inner peripheral surface of the skirt portion externally mounted on the front end of the body portion is An arrowhead fixed to the front end of the body part in a state in contact with the outer peripheral surface of the body part. In the arrowhead according to any one of claims 1 to 3,
Furthermore, comprising a weight member,
The weight member and the arrowhead base are an engagement insertion portion side engagement portion provided at a free end of the insertion insertion portion, and a weight member side first engagement portion provided at one end of the weight member. Arrowheads that can be connected by engagement. In the arrowhead according to claim 4,
Comprising a plurality of weight members,
One weight member and another weight member, a weight member side first engagement portion provided at one end of the one weight member, and a weight member side second engagement provided at the other end of the other weight member Yajiri that can be connected by engaging with the part. In the arrowhead according to any one of claims 1 to 5,
An arrowhead in which one or more spiral grooves are provided along the outer peripheral surface of the arrowhead main body. In the arrowhead according to claim 6,
An arrowhead in which the spiral groove is provided in three strips with a phase difference of 120 degrees. In the arrowhead according to claim 6 or 7,
An arrowhead in which the spiral angle of the spiral groove is within a range of 20 ± 5 degrees.   An arrow comprising the arrowhead according to any one of claims 1 to 8.

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