WO2018194010A1

WO2018194010A1 - Shuttlecock

Info

Publication number: WO2018194010A1
Application number: PCT/JP2018/015649
Authority: WO
Inventors: 史倫大西
Original assignee: ヨネックス株式会社
Priority date: 2017-04-17
Filing date: 2018-04-16
Publication date: 2018-10-25
Also published as: JP2018175525A; TW201838693A

Abstract

The present invention is a shuttlecock provided with a base part and a skirt part provided to the base part. The base part has: a curved surface section comprising a curved surface; and a foundation section that has a cylindrical shape connected to the curved surface section, wherein the skirt part is fixed to an end surface on the opposite side of the curved surface section. The radius of curvature of the curved surface section is greater than the radius of the foundation section.

Description

Shuttlecock

The present invention relates to a shuttlecock.

As a base material (core material) of a shuttlecock for badminton, for example, in Patent Document 1, granular cork (cork particles) obtained by pulverizing natural cork and an adhesive are mixed, and the cork particles are bonded with an adhesive. . Since the end material of cork is used, it can be manufactured at a lower cost and more stably than natural cork.

In Patent Document 2, a foaming agent is filled between cork particles. Filling the foaming agent increases the hardness and can improve the hitting performance (hit feel and hitting sound).

Japanese Utility Model Publication No. 7-21077 Japanese Patent Laying-Open No. 2015-181657

In the case of Patent Document 1, the base portion (cork) can be manufactured at a relatively low cost. However, when used for a long time, there is a problem that the adhesive between the particles peels off and the shape collapses. Further, even in Patent Document 2, when the impact is repeated after being used for a long time, there is a problem that the base portion is cracked or deformed and cannot be hit at the target location. In particular, in an artificial shuttlecock in which the skirt portion is made of plastic, it has been required to improve the durability of the base portion so that the base portion does not break before the skirt portion breaks.

The present invention has been made in view of such circumstances, and an object of the present invention is to improve durability.

A main invention for achieving the above object is a shuttlecock including a base portion and a skirt portion provided on the base portion, wherein the base portion is a curved surface portion formed of a curved surface, and the curved surface portion. A base having a continuous cylindrical shape, and a base on which the skirt is fixed to an end surface opposite to the curved surface, and a radius of curvature of the curved surface is larger than a radius of the base It is a shuttlecock characterized by.

Other characteristics of the present invention will be clarified by the description of the present specification and drawings.

According to the shuttlecock of the present invention, durability can be improved.

It is a perspective view of the shuttlecock 1 seen from the base part 2 side. FIG. 3 is a perspective view of the shuttlecock 1 viewed from the skirt portion 10 side. 3A and 3B are illustrations of permanent distortion of the base portion 2. FIG. It is a conceptual sectional view for explaining the composition of base part 2 of this embodiment. It is a figure which shows the shape and evaluation result of each sample. It is a figure which shows the relationship between curvature radius R1 and the frequency | count until breakage of the base part 2. FIG.

=== Overview ===
At least the following matters will become clear from the description of the present specification and the drawings.

A shuttlecock comprising a base portion and a skirt portion provided on the base portion, wherein the base portion is a curved surface portion formed of a curved surface, and a cylindrical base portion continuous with the curved surface portion, A shuttlecock having a base portion to which the skirt portion is fixed to an end surface opposite to the curved surface portion, and having a radius of curvature of the curved surface portion larger than a radius of the base portion is apparent.
According to such a shuttlecock, the number of shots until the base portion is damaged can be increased, and the durability can be improved.

In such a shuttlecock, the radius of curvature is preferably larger than 14 mm.
According to such a shuttlecock, durability can be improved reliably.

In such a shuttlecock, it is desirable that the skirt portion is formed of an artificial material.
According to such a shuttlecock, the base portion can be prevented from being damaged before the skirt portion is damaged, which is more effective.

In such a shuttlecock, it is preferable that the base portion is formed by solidifying cork particles.
According to such a shuttlecock, it is possible to improve the hitting performance.

=== Embodiment ===
<Basic structure of shuttlecock>
FIGS. 1 and 2 are external views for explaining the basic structure of a shuttlecock 1 (artificial shuttlecock) including a skirt portion 10 formed of artificial feathers 4. FIG. 1 is a perspective view of the shuttlecock 1 as seen from the base portion 2 side. FIG. 2 is a perspective view of the shuttlecock 1 viewed from the skirt portion 10 side. In the following description, the side of the shuttlecock 1 where the base portion 2 is provided is the front side, and the opposite side (the skirt portion 10 side) is the rear side.

The base portion 2 is formed by covering the periphery of a pressed cork or plastic cork base with a thin skin (for example, artificial leather). The base portion 2 includes a curved surface portion 21 (having a hemispherical shape here) located on the front side of the base portion 2 and a cylindrical base portion 22 continuous to the rear side of the curved surface portion 21. It is configured. A flat end surface 2A is formed at the rear end of the base portion 22, and the front end (one end of the artificial feather 4) of the skirt portion 10 is fixed to the end surface 2A. The diameter of the base portion 2 is defined as 25 to 28 mm (radius 12.5 to 14 mm) by BWF (Badminton World Federation). The configuration (shape) of the base portion 2 of this embodiment will be described later.

The skirt portion 10 is provided on the rear side of the base portion 2 and is formed of plastic (for example, nylon resin). The skirt portion 10 of the present embodiment has a wing shaft 11, a horizontal rib 12, and a vertical rib 13.

The plurality of wing shafts 11 (16 in this case) are provided on the end surface 2A of the base portion 2 so as to be arranged in an annular shape. Each of these wing shafts 111 has its front end in the axial direction fixed to the end surface 2A of the base portion 2, and the distance from each other increases as the distance from the base portion 2 (end surface 2A) increases.

The horizontal rib 12 is a part that connects adjacent wing shafts 11. In this comparative example, the horizontal rib 12 is provided at a position closer to the base portion 2 than the plurality of horizontal ribs 12A provided on the rear end side of the axial center of the blade shaft 11 and the plurality of horizontal ribs 12A. It has the horizontal rib 12B.

A plurality of vertical ribs 13 are provided between adjacent wing shafts 11. Further, the plurality of vertical ribs 13 and the plurality of horizontal ribs 12A intersect in a cross shape and are formed in a lattice shape.

The first blade portion H1 and the second blade portion H2 are formed in the skirt portion 10 by these ribs. The second blade portion H2 is a region where the number of vertical ribs 13 is larger than that of the first blade portion H1 (that is, at a narrow interval), and the density of the ribs is large. In other words, the second blade portion H2 has a smaller aperture ratio than the first blade portion H1.

The first blade portion H1 and the second blade portion H2 are alternately arranged in the circumferential direction of the skirt portion 10. By adopting such a shape, the rotational speed can be improved.

<About permanent strain>
3A and 3B are explanatory diagrams of the permanent strain of the base portion 2.

The pressed cork used as the core material of the base part of the shuttlecock is obtained by bonding (hardening) granular cork (cork particles) obtained by pulverizing natural cork with an adhesive. Since a natural cork mill is used, it can be manufactured at a lower cost than a natural cork cut, but the adhesive between particles may be peeled off by hitting, and the shape may be destroyed.

In order to solve this problem, a foaming agent is filled between the cork particles in the base portion 2 of the present embodiment. Thereby, a hit feeling and a hitting sound can be improved, and distortion in the base portion 2 is less likely to occur during hitting.

However, even in this case, when used for a long time, the base portion 2 is deformed from the state shown in FIG. 3A to the shape shown in FIG. 3B and is not restored to the shape shown in FIG. Permanent distortion occurs. When such a strain occurs, the base portion 2 is broken or cannot be hit at the target location.

Therefore, in this embodiment, the durability is improved by changing the shape of the base portion 2. In addition, as shown to FIG. 3A, let the curvature radius of the surface of the curved surface part 21 of the base part 2 be R1. Further, the radius of the circle of the cylindrical base portion 22 is R2. The curved surface portion 21 of the normal base portion 2 (FIG. 3A) is hemispherical, and the radius of curvature R1 and the radius R2 are equal (for example, 13 mm). Further, the height of the base portion 22 (the length in the central axis direction of the cylinder) is constant (for example, 10 mm).

<Base part of this embodiment>
FIG. 4 is a conceptual cross-sectional view for explaining the configuration of the base portion 2 of the present embodiment.

In the base portion 2 of the present embodiment, as shown in FIG. 4, the curvature radius R1 of the curved surface portion 21 is larger than the radius R2 of the base portion 22 (R1> R2). In this case, as compared with the complete hemispherical shape of FIG. 3A, the front end is slightly sharpened (projected forward).

By adopting such a shape, even if it is repeatedly hit and deformed, it approaches a hemispherical shape as shown in FIG. 3A. Therefore, it becomes harder to break than the case of the shape of FIG. 3A from the beginning, and durability can be improved.

As described above, the diameter of the base portion 2 is defined as 25 to 28 mm. In other words, the radius R2 is 12.5 to 14 mm. That is, if the curvature radius R1 is larger than 14 mm, the above condition (R1> R2) is surely satisfied.

<< Example >>
A base part 2 having a different shape (curvature radius R1) of the curved surface part 21 was actually created (samples A to D), and the number of times (number of shots) until it was damaged by repeated impacts was evaluated. The same evaluation was performed for natural cork.

FIG. 5 is a diagram showing the shape of each sample and the evaluation results.

<Sample>
Sample A: R1 = 12.2 mm
Sample B: R1 = 13.1 mm (equivalent shape to natural cork)
Sample C: R1 = 13.4 mm
Sample D: R1 = 14.7 mm
Natural cork: R1 = 13.0mm
In addition, the radius R2 of the base part 2 (base part 22) is all 13.0 mm.

From the cross-sectional photograph of each sample in FIG. 5, it can be seen that the shape of the front side of the base portion 2 is changed according to the dimension of the radius of curvature R1. For example, in sample A, the radius of curvature R1 is smaller than the radius R2 (13.0 mm), and the front end is flat. Sample B has a perfect hemispherical shape (having the same shape as natural cork) with almost equal curvature radii R1 and radius R2. In sample C and sample D, the radius of curvature R1 is larger than the radius R2 (13.0 mm). That is, among the above samples, the sample C and the sample D correspond to the present embodiment (R1> R2). The sample D has a radius of curvature R1 larger than that of the sample C, and the front side is sharper.

<Evaluation method>
The number of shots until the base part 2 was damaged was repeatedly counted.

Measured 4 times for each sample (condition).

<Evaluation results>
The evaluation result of each sample is shown in FIG. FIG. 6 is a diagram showing the relationship between the radius of curvature R1 and the number of times until the base portion 2 is broken. The horizontal axis of FIG. 6 indicates the magnitude of the curvature radius R1 of each sample, and the vertical axis indicates the number of shots until the base portion 2 is damaged. In FIG. 6, the evaluation result of each sample is linearly approximated.

5 and 6, it can be seen that there is a correlation between the size of the radius of curvature R1 and the number of shots until failure (that is, durability). Specifically, the larger the radius of curvature R1, the greater the number of shots until breakage (that is, the durability is improved). Therefore, it was confirmed that the durability could be improved over the conventional one (sample B) by making the curvature radius R1 larger than the radius R2. For example, the sample D can improve the durability by 35% compared to the sample B (natural cork equivalent shape).

In the case of natural cork, the characteristic variation is large, but the evaluation results of the natural cork samples in FIGS. 5 and 6 show the best values (maximum values). In this embodiment, in order to make the durability equal to the characteristics of this natural cork, the radius of curvature R1 may be set to 15.4 mm from FIG.

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

<About the skirt>
In the above-described embodiment, the skirt portion 10 is formed in a lattice shape by intersecting the plurality of horizontal ribs 12 </ b> A and the plurality of vertical ribs 13, but is not limited thereto. For example, artificial feathers simulating natural feathers may be arranged on the base portion 2 in an annular shape. Further, for example, the skirt portion may be formed of natural feathers. However, it is more effective when applied to a skirt portion formed of an artificial material (artificial shuttlecock) as in the above-described embodiment.

<About the base>
In the above-described embodiment, the base portion 2 is formed by filling a foaming agent between cork particles. However, the present invention is not limited to this. For example, the base portion 2 may not be filled with a foaming agent. However, it is possible to improve the hitting performance by filling the foaming agent.

DESCRIPTION OF SYMBOLS 1 Shuttlecock 2 Base part 2A End surface 10 Skirt part 11

Wing shaft

12, 12A, 12B Horizontal rib 13 Vertical rib 21 Curved surface part 22 Base H1 1st blade part H2 2nd blade part

Claims

A base part;
A skirt provided on the base,
A shuttlecock comprising:
The base portion is
A curved surface portion comprising a curved surface;
A cylindrical base that is continuous with the curved surface, wherein the skirt is fixed to an end surface opposite to the curved surface;
Have
A radius of curvature of the curved surface portion is larger than a radius of the base portion,
A shuttlecock characterized by that.
The shuttlecock according to claim 1,
The radius of curvature is greater than 14 mm;
A shuttlecock characterized by
The shuttlecock according to claim 1 or 2,
The skirt portion is formed of an artificial material.
A shuttlecock characterized by that.
The shuttlecock according to any one of claims 1 to 3,
The base portion is formed by solidifying cork particles,
A shuttlecock characterized by that.