Vibration reduction weight for a Japanese longbow, Japanese longbow, and method for reducing vibration of a Japanese longbow

Abstract

To provide a vibration reduction weight or the like for a Japanese bow capable of reducing vibration in shooting the Japanese bow.SOLUTION: A vibration reduction weight 1 for a Japanese bow comprises resin material including metal powder and has flexibility. The vibration reduction weight 1 for the Japanese bow can be attached to a grip part 7 or arrow slide binding 8 of the Japanese bow 5. In addition, the metal powder is preferably powder of the metal with a specific gravity equal to or greater than 6 g / cm3, in particular powder of tungsten. Further, the resin material can be rubber material. Further, the shape of the vibration reduction weight can be rod-like or sheet-like.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration reduction weight for a Japanese bow, a Japanese bow, and a method for reducing vibration of a Japanese bow. Specifically, the present invention relates to a vibration reduction weight for a Japanese bow that reduces vibration of the Japanese bow when shooting an arrow by being attached to the Japanese bow, a Japanese bow equipped with this vibration reduction weight for a Japanese bow, and a method for reducing vibration of a Japanese bow.

Background Art

[0002] A bow is a weapon for holding and shooting an arrow, and is also used in martial arts and competitions such as kendo and archery. Bows can be broadly classified into Japanese bows and Western bows. A Japanese bow is a long bow used in Japanese kendo and archery. In order to transmit the energy of the bow to the arrow, strings are stretched at both the upper and lower ends of the bow.

[0003] When shooting an arrow using a bow, in the case of a Japanese bow, the archer holds the bow handle (yuzuka) of the Japanese bow with the left hand, hooks the middle string (nakajikake) provided on the string onto the notch cut at the rear end of the arrow, and holds the string and the arrow with the right hand (mete) that inserts the yugake. In this state, the archer and the mete pull down significantly from above and draw the bow greatly until the mete reaches around the right shoulder. Then, with the aim fixed, the string and the arrow are released from the mete, and the arrow is fired. At this time, the fired arrow will fly while being in close contact with or touching the fingers of the archer who is holding the bow for some time. At this time, due to the recoil from firing the arrow, the bow vibrates, so the archer cannot stabilize, and as a result, the arrow flight may be adversely affected (the aim may not be fixed).

[0004] A similar phenomenon can also occur in Western bows such as archery. However, archery is equipped with a vibration reduction device called a stabilizer, which makes it easier to achieve the desired arrow flight. Such a stabilizer is, for example, a rod that extends greatly forward or a horn shape that protrudes left and right, and is very conspicuous in appearance and is the most characteristic feature of an archery bow. And there is a rod-shaped stabilizer that extends significantly forward, which suppresses the left-right movement (torque) and the up-down inclination (pitching) of the entire bow, and there is an angular stabilizer that protrudes left and right, which mainly suppresses the rotation (rolling) around the pusher axis.

[0005] For example, Patent Document 1 below discloses an archery equipped with a long stabilizer G that extends significantly forward and a short stabilizer S1.

[0006] However, in the case of a Japanese bow, it is not possible to attach a large and conspicuous stabilizer like that of archery. Therefore, for the purpose of reducing the vibration when shooting an arrow as much as possible, etc., it has been an old practice to hold the part that can be a vibration node with the archer's hand and shoot the arrow. Specifically, among the parts that can be vibration nodes, namely, the part approximately 1 / 3 of the length of the Japanese bow from the upper end in the vertical direction and the part approximately 2 / 3 of the length of the Japanese bow from the upper end in the vertical direction, the archer holds the part approximately 2 / 3 of the length of the Japanese bow from the upper end in the vertical direction and shoots the arrow. By such a method, the vibration transmitted from the bow to the archer has been weakened to some extent.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Thus, in the Japanese bow, it has been an old practice for the archer to hold the part approximately 2 / 3 of the length of the Japanese bow from the upper end in the vertical direction and shoot the arrow. However, other than this, no method for reducing vibration has been carried out.

[0009] The present invention has been made in view of the above matters, and an object thereof is to provide a vibration reduction weight for a Japanese bow, a Japanese bow, and a method for reducing vibration of a Japanese bow, which can reduce vibration when shooting an arrow with a Japanese bow.

Means for Solving the Problems

[0010] In order to solve the above problems, a vibration reduction weight for a Japanese bow is made of a resin material containing metal powder and has flexibility.

[0011] By attaching this vibration reduction weight for a Japanese bow to a predetermined position of the Japanese bow, vibration when shooting an arrow can be reduced. Further, since the vibration reduction weight for a Japanese bow has flexibility, it is difficult to inhibit the bending of the Japanese bow. Furthermore, since the vibration reduction weight for a Japanese bow is made of a resin material containing metal powder, it is easy to form into an arbitrary shape while ensuring the weight as a weight.

[0012] It can be a vibration reduction weight for a Japanese bow that is attached to the grip portion or the arrow rest of the Japanese bow.

[0013] This vibration reduction weight for a Japanese bow can further reduce vibration when shooting an arrow. The grip portion of the Japanese bow is provided at a portion approximately two-thirds of the length of the Japanese bow from the upper end in the vertical direction of the Japanese bow, which is a node of vibration (usually, a grip leather is wound around this portion to form the grip portion). By attaching a vibration reduction weight to this portion, the node of vibration becomes more stable, and vibration when shooting an arrow can be further reduced. Further, when a vibration reduction weight is attached to the arrow rest adjacent to the upper side of the grip portion, the same operational effects can be expected. It is also possible to attach vibration reduction weights to both the arrow rest and the grip portion. The vibration reduction weight for a Japanese bow can be attached, for example, to the back side of the grip portion (grip leather), that is, between the grip portion (grip leather) and the Japanese bow, or to the back side of the arrow rest, that is, between the arrow rest and the Japanese bow. The mounting position of the vibration reduction weight for the Japanese bow is preferably at the portion from 8 / 15 to 12 / 15 of the length of the Japanese bow from the upper end in the vertical direction of the Japanese bow, and more preferably at the portion from 9 / 15 to 11 / 15 of the length of the Japanese bow from the upper end in the vertical direction of the Japanese bow. The length of the Japanese bow is the length along the Japanese bow.

[0014] The specific gravity is 5 g / cm 3 or more, and it can also be used as the vibration reduction weight for the Japanese bow.

[0015] This vibration reduction weight for the Japanese bow is heavy and can further reduce the vibration when shooting an arrow. The specific gravity of the vibration reduction weight for the Japanese bow is preferably 8 g / cm 3 or more, more preferably 10 g / cm 3 or more, and most preferably 11 g / cm 3 or more. The upper limit of the specific gravity of the vibration reduction weight for the Japanese bow is not particularly limited. However, the specific gravity of gold is 19.32 g / cm 3 and the specific gravity of tungsten is 19.3 g / cm 3 . Considering that metal powders with such specific gravities are dispersed in the resin material, usually it is 18 g / cm 3 or less, generally 18 g / cm 3 or less, and usually 15 g / cm 3 or less.

[0016] It is also preferable that the metal powder is the powder of a metal with a specific gravity of 6 g / cm 3 or more and be used as the vibration reduction weight for the Japanese bow.

[0017] This vibration reduction weight for the Japanese bow is likely to become heavy by using high specific gravity metal powders.

[0018] It is also preferable that the metal powder is all or part of the powder of tungsten and be used as the vibration reduction weight for the Japanese bow.

[0019] The specific gravity of tungsten is 19.3 g / cm 3While having a high specific gravity close to that of gold, it is inexpensive compared to gold. Therefore, this vibration-reducing weight for a Japanese bow is heavy and relatively inexpensive.

[0020] The metal powder is a powder of a metal with a specific gravity of 6 g / cm 3 or more, and it is also preferable that the resin material is a rubber-based material to be used as the vibration-reducing weight for a Japanese bow.

[0021] This vibration-reducing weight for a Japanese bow can achieve both weight and flexibility.

[0022] It can also be a vibration-reducing weight for a Japanese bow that is rod-shaped.

[0023] This vibration-reducing weight for a Japanese bow can be attached and used along the vertical direction of the Japanese bow. For example, a rod-shaped vibration-reducing weight can be installed at the position where the grip leather forming the grip part is wound, and then the grip leather can be wound from above. The vibration-reducing weight for a Japanese bow is preferably rod-shaped with a length of 5 to 15 cm and a width of 1 to 3 cm.

[0024] It can also be a vibration-reducing weight for a Japanese bow that is sheet-shaped.

[0025] This vibration-reducing weight for a Japanese bow can be wound around the Japanese bow and used. For example, a sheet-shaped vibration-reducing weight can be wound around the Japanese bow and installed at the position where the arrow rest is formed, and then the cane can be wound from above to form the arrow rest.

[0026] It can also be a vibration-reducing weight for a Japanese bow with a weight of 20 to 100 g.

[0027] This vibration-reducing weight for a Japanese bow can further reduce the vibration when shooting an arrow. The weight of the vibration-reducing weight for a Japanese bow is preferably 30 to 80 g, more preferably 40 to 60 g, and most preferably 45 to 55 g.

[0028] The above problem can also be solved by a Japanese longbow equipped with a vibration reduction weight for any of these Japanese longbows.

[0029] Furthermore, the above problem can also be solved by a method for reducing vibration of a Japanese longbow, in which a vibration reduction weight for a Japanese longbow made of a resin material containing metal powder and having flexibility is attached to the grip portion or the arrow rest of the Japanese longbow. In this method, the vibration reduction weight for a Japanese longbow described in any of the above can be used.

Advantages of the Invention

[0030] According to the present invention, it is possible to provide a vibration reduction weight for a Japanese longbow, a Japanese longbow, and a method for reducing vibration of a Japanese longbow, which can reduce vibration when shooting an arrow with a Japanese longbow.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0032] Hereinafter, a vibration reduction weight for a Japanese bow and the like will be exemplified and described with reference to the drawings. The vibration reduction weight for a Japanese bow is made of a resin material containing metal powder and has flexibility. Hereinafter, each element and the like will be exemplified and described, but the present invention is not limited to the following description. First, the metal powder will be exemplified and described. In this specification, the vibration reduction weight for a Japanese bow may be simply abbreviated as "vibration reduction weight".

[0033] 1. Metal powder The metal powder imparts weight as a weight to the vibration reduction weights 1, 2, and 2'. The type of metal used for the metal powder is not particularly limited as long as it has a certain specific gravity. However, the specific gravity of the metal used for the metal powder is preferably 6 g / cm 3 or more. Examples of such metals include gold, bismuth, cobalt, chromium, copper, iron, manganese, molybdenum, niobium, nickel, lead, platinum, selenium, tin, tantalum, titanium, vanadium, tungsten, zinc, zirconium, their oxides, alloys, compounds, and the like. Among them, tungsten is preferable because of its high specific gravity of 19.3 g / cm 3 . Also, the metal used for the metal powder includes alloys, oxides, and the like. A plurality of types of metal powder can be mixed and used.

[0034] The size of the metal powder is not particularly limited either. For example, those of so-called nano size to several mm can be used. The size (average particle diameter) of the metal powder is preferably 1 μm to 1 mm, more preferably 5 μm to 500 μm, and most preferably 10 μm to 100 μm. When tungsten is used for the metal powder, its average particle diameter is preferably 1 to 50 μm, more preferably 1.5 to 10 μm, and most preferably 2 to 5 μm. Such tungsten powder can be produced by hydrogen reduction of an oxide or the like.

[0035] The shape of the metal powder is not particularly limited either, and for example, substantially spherical, substantially elliptical, substantially scaly, substantially dendritic, substantially linear, irregular shapes, and the like can be used.

[0036] Various surface treatments may be performed on the surface of the metal powder for the purpose of enhancing its affinity with the resin material, etc.

[0037] 2. Resin material The resin material forms the vibration-reducing weights 1, 2, and 2'. The type of resin material is not particularly limited as long as it can impart flexibility to the vibration-reducing weights. For example, one or more selected from polyurethane, urethane-modified polyester, rubber-modified epoxy resin, urethane-modified epoxy resin, and various rubber-based materials can be mentioned. Moreover, as the rubber-based material, for example, one or more selected from natural rubber, polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, fluororubber, urethane rubber, and silicone rubber can be mentioned. Among them, ethylene-propylene rubber is preferable.

[0038] 3. Vibration-reducing weight The proportion of the metal powder in the vibration-reducing weights 1, 2, and 2' is greatly affected by the specific gravity of the metal powder and the specific gravity of the vibration-reducing weight to be obtained. In addition, it may also be slightly affected by the specific gravity of the resin material and the presence or absence of other components (various fillers and additives, etc.). For example, when using tungsten (specific gravity 19.3 g / cm 3 ) powder as the metal powder and ethylene-propylene rubber (specific gravity 0.86 g / cm 3 ) as the resin material, and aiming to obtain a vibration-reducing weight with a specific gravity of 5 g / cm 3 , the proportion of the metal powder in the vibration-reducing weight is approximately 22.5% by weight. When aiming to obtain a vibration-reducing weight with a specific gravity of 10 g / cm 3 , the proportion of the metal powder in the vibration-reducing weight is approximately 49.6% by weight. When aiming to obtain a vibration-reducing weight with a specific gravity of 15 g / cm 3 , the proportion of the metal powder in the vibration-reducing weight is approximately 76.7% by weight.

[0039] When using tungsten powder (tungsten metal powder) as the metal powder, the proportion of tungsten powder in the vibration reduction weight is preferably 20 to 80% by weight. When the proportion of tungsten powder is 20% by weight or more, sufficient specific gravity can be ensured as the vibration reduction weight. When the proportion of tungsten powder is 80% by weight or less, sufficient flexibility of the vibration reduction weight can be ensured. The proportion of tungsten powder in the vibration reduction weight is more preferably 30 to 70% by weight, and even more preferably 40 to 60% by weight.

[0040] The vibration reduction weights 1, 2, 2' are formed using the metal powder and the resin material as exemplified above. The shape of the vibration reduction weight is not particularly limited, and for example, it can be in the shape of a rod or a sheet. The method of forming such a shape is not particularly limited, and for example, injection molding, extrusion molding, and vacuum molding can be used.

[0041] The rod-shaped vibration reduction weight 1 is illustrated in FIG. 1. This vibration reduction weight 1 is rod-shaped with a length (vertical direction in FIG. 1) of approximately 90 mm and a width of approximately 19 mm, and the cross-section is substantially crescent-shaped. The thickness of this vibration reduction weight 1 is preferably 0.3 to 3 mm, more preferably 0.5 to 2.5 mm, and most preferably 1 to 2 mm. This vibration reduction weight 1 can be attached to the grip portion 7 of the Japanese bow 5, for example, as illustrated in FIGS. 2 and 3. Specifically, the vibration reduction weight 1 can be attached to a portion approximately 2 / 3 from the upper end in the vertical direction of the Japanese bow 5, and the grip leather 71 can be wound around it from above to form the grip portion 7. As a result, the vibration reduction weight 1 is attached to the back side of the grip leather 71, that is, between the grip leather 71 and the Japanese bow 5.

[0042] Next, the sheet-shaped vibration reduction weight 2 is illustrated in FIG. 4. This vibration reduction weight 2 is sheet-shaped with a length of 60 mm and a width of 60 mm. Although the vibration reduction weight 2 illustrated in FIG. 4 is sheet-shaped and has flexibility, for the convenience of explanation, it is shown in an upright state instead of a horizontal state. This vibration reduction weight 2 can be attached to the arrow rest rattan 8 of the Japanese longbow 5, for example, as illustrated in FIGS. 5 and 6. Specifically, a sheet-like vibration reduction weight 2' can be wound around above the grip portion 7 of the Japanese longbow 5, and a rattan 81 of the length for one draw of the bow can be wound around it from above to form the arrow rest rattan 8. As a result, the vibration reduction weight 2' is attached to the back side of the arrow rest rattan 8, that is, between the arrow rest rattan 8 and the Japanese longbow 5. In FIG. 6, the vibration reduction weight 2 is cut along the outer circumference of the Japanese longbow 5 and used as the vibration reduction weight 2'.

[0043] As described above, the present invention has been illustrated and described with reference to specific embodiments. However, the present invention is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art without departing from the scope of the claims attached to the application of the present application.

[0044] For example, the bar-shaped vibration reduction weight illustrated in FIG. 1 has a substantially crescent-shaped cross section, but is not limited thereto and can have any cross-sectional shape. Also, various dimensions such as the length and width of the vibration reduction weight are not particularly limited, but it is preferable to make the vibration reduction weight of high specific gravity without making the length too long. In the example of FIG. 3, the bar-shaped vibration reduction weight is attached to the inside (archer side) of the Japanese longbow, but it is not limited thereto and can also be attached to the outside or both sides.

[0045] For example, as illustrated in FIG. 6, the sheet-like vibration reduction weight is cut into a shape along the outer circumference of the Japanese longbow and wound once above the grip portion of the Japanese longbow, but it is not limited thereto and may be wound multiple times above the grip portion of the Japanese longbow. Also, the long and narrow sheet-like vibration reduction weight may be attached to the inside, outside, and both left and right sides of the Japanese longbow, respectively. The sheet-like vibration reduction weight has the characteristic of being easily cut into any shape.

Explanation of Reference Numerals

[0046] 1 Vibration reduction weight for Japanese longbow (bar-shaped) 2 2' Vibration reduction weight for Japanese longbow (sheet-like) 5 Japanese longbow 6 strings 7 grip part 71 grip leather 8 arrow rest rattan 81 rattan

Claims

1. A vibration reduction weight for a Japanese bow, made of a resin material containing metal powder, having flexibility, and weighing 20 to 100 g.

2. It is attached to the gripping part of the Japanese bow or the arrow rest. The vibration reduction weight for a Japanese bow according to Claim 1.

3. with a specific gravity of 5 g / cm ３ or more The vibration reduction weight for a Japanese bow according to Claim 1 or Claim 2.

4. The metal powder is a powder of a metal with a specific gravity of 6 g / cm ３ or more. The vibration reduction weight for a Japanese bow according to any one of Claims 1 to 3.

5. All or part of the metal powder is tungsten. The vibration reduction weight for a Japanese bow according to any one of Claims 1 to 4.

6. The metal powder is a powder of a metal with a specific gravity of 6 g / cm ３ or more, and The resin material is a rubber-based material. The vibration reduction weight for a Japanese bow according to any one of Claims 1 to 5.

7. It is rod-shaped. The vibration reduction weight for a Japanese bow according to any one of Claims 1 to 6.

8. It is sheet-shaped. The vibration reduction weight for a Japanese bow according to any one of Claims 1 to 6.

9. A Japanese bow equipped with the vibration reduction weight for a Japanese bow according to any one of Claims 1 to 8.

10. A method for reducing vibration of a Japanese bow, which comprises attaching a vibration reduction weight for a Japanese bow, made of a resin material containing metal powder, having flexibility, and weighing 20 to 100 g, to the gripping part or the arrow rest of the Japanese bow.

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