WO2018194011A1 - Shuttlecock - Google Patents

Abstract

The present invention is a shuttlecock provided with a base part and a skirt part provided to an end surface of the base part, wherein the skirt part has: a plurality of feather shafts that are placed side by side in an annular shape on the end surface, one end in the axial direction of each of the feather shafts being fixed to the end surface; and a plurality of ribs that connect adjacent feather shafts to each other. All of the ribs in a range between a predetermined position and the other end of the feather shafts are provided obliquely to the feather shafts.

Description

Shuttlecock

The present invention relates to a shuttlecock.

For badminton shuttlecocks, we used waterfowl feathers (natural feathers) for feathers (natural shuttlecocks), and artificial feathers made of nylon resin, etc. (artificial shuttles) Cook).

Also known as artificial shuttlecocks are those that mimic natural feathers and those that have wings (hereinafter also referred to as skirts) configured in the shape of a cross. However, such an artificial shuttlecock does not have a characteristic flight trajectory like a natural shuttlecock. One reason for this is that the number of revolutions during flight is less than that of a natural shuttlecock.

Therefore, for example, in Patent Document 1, in the lattice-shaped artificial shuttlecock, the rotational speed is improved by changing the opening ratio of the skirt portion according to the position in the circumferential direction.

Japanese Patent No. 4392454

However, in the above-described shuttlecock, there is a possibility that the flight distance and the deceleration characteristic may be deteriorated due to increase in weight or aerodynamic characteristics, and the design property may be deteriorated. As described above, there is a possibility of adversely affecting characteristics other than the rotational speed.

The present invention has been made in view of such circumstances, and an object of the present invention is to improve the rotational speed without affecting other characteristics.

A main invention for achieving the above object is a shuttlecock comprising a base portion and a skirt portion provided on an end surface of the base portion, wherein the skirt portion is a plurality of annularly arranged on the end surface. Each of which has a plurality of wing shafts, one end of which is fixed to the end face, and a plurality of ribs connecting the adjacent wing shafts, and a predetermined position of the wing shaft. The shuttlecock is characterized in that all the ribs in the range between the other end are provided obliquely with respect to the wing shaft.

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, the rotational speed during flight can be improved.

It is a side view of the shuttlecock 1 of this embodiment. It is the perspective view of the shuttlecock 1 seen from the front. It is the perspective view of the shuttlecock 1 seen from back. It is a front view of the shuttlecock 1 seen from the front. It is a side view of the shuttlecock 100 of a comparative example. It is the perspective view of the shuttlecock 100 seen from the front. It is the perspective view of the shuttlecock 100 seen from back. It is a front view of the shuttlecock 100 seen from the front. It is a side view of the shuttlecock 1 of Example 3. It is a side view of the shuttlecock 1 of Example 4. It is the perspective view of the shuttlecock 1 of Example 4 seen from the front. It is the perspective view of the shuttlecock 1 of Example 4 seen from back. It is a front view of the shuttlecock 1 of Example 4 seen from the front.

=== 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 an end surface of the base portion, wherein the skirt portion is a plurality of wing shafts arranged in an annular shape on the end surface, each of which is an axial direction A plurality of wing shafts, one end of which is fixed to the end face, and a plurality of ribs connecting the adjacent wing shafts, and the rib in a range between a predetermined position of the wing shaft and the other end The shuttlecock is characterized in that it is all provided obliquely with respect to the wing shaft.
According to such a shuttlecock, it is possible to improve the rotational speed during flight.

In this shuttlecock, the first blade portion and the second blade portion having an opening ratio smaller than that of the first blade portion are alternately arranged in the circumferential direction of the skirt portion using the ribs in the range. It is desirable to be formed with.
According to such a shuttlecock, the rotation speed can be further improved.

In this shuttlecock, the nth rib (n is a natural number) from the other end in the region on one side of the skirt portion in the circumferential direction with respect to the wing shaft, and the circumferential direction with respect to the wing shaft It is desirable that the n-th rib from the other end in the other region is connected to a different position in the axial direction of the wing shaft.
According to such a shuttlecock, the number of rotations can be improved and breakage can be suppressed.

In this shuttlecock, it is desirable that the nth rib in the one side region is continuous with the ribs other than the nth in the other side region via the blade shaft.
According to such a shuttlecock, the strength can be increased and the productivity of the mold can be improved.

In this shuttlecock, it is desirable that a rib having a width larger than each rib in the range is provided obliquely with respect to the blade axis on the one end side than the range.
According to such a shuttlecock, it can be made easy to recognize that the rib is inclined with respect to the wing shaft, and the rotational speed can be further improved.

In this shuttlecock, it is desirable that the rib closest to the base portion is orthogonal to the wing shaft.
According to such a shuttlecock, the weight can be reduced, and each wing shaft is hardly twisted.

In such a shuttlecock, it is preferable that the predetermined position is a midpoint of the wing shaft.

Such a shuttlecock can improve the rotational speed.

=== Embodiment ===
<Structure of shuttlecock of this embodiment>
The structure of the shuttlecock 1 of this embodiment is demonstrated referring drawings. In the following description, the side where the base portion 2 of the shuttlecock 1 is provided is the front side, and the opposite side is the rear side. FIG. 1 is a side view of the shuttlecock 1 of the present embodiment. FIG. 2 is a perspective view of the shuttlecock 1 viewed from the front. FIG. 3 is a perspective view of the shuttlecock 1 viewed from the rear. FIG. 4 is a front view of the shuttlecock 1 as viewed from the front.

The shuttlecock 1 is an artificial shuttlecock and includes a base portion 2 and a skirt portion 10.

The base part 2 is constituted by covering a thin skin on a cork base, for example. The base portion 2 has a hemispherical shape with a front portion of 25 mm to 28 mm in diameter, and has a flat end surface 2A at the rear end. In this embodiment, the cork of the base portion 2 is not a natural cork but a cork formed by solidifying cork particles.

The skirt portion 10 is made of plastic (for example, nylon resin), and is provided so as to spread rearward from the end surface 2A of the base portion 2 (so that the diameter increases). The skirt portion 10 of the present embodiment includes a wing shaft 11, a horizontal rib 12 (corresponding to a rib), a vertical rib 13, and a vertical rib 14.

The wing shaft 11 is a linear member constituting the skirt portion 10, and a plurality (16 in the present embodiment) are provided on the end surface 2 </ b> A of the base portion 2 so as to be arranged in an annular shape. Each of these wing shafts 11 has a front end (corresponding to one end) in the axial direction fixed to the end surface 2A of the base portion 2, and approaches the rear end as it moves away from the base portion 2 (end surface 2A). The distance between each other increases.

The horizontal rib 12 is a part that connects adjacent wing shafts 11. In the present embodiment, the lateral rib 12 includes a lateral rib 12A, a lateral rib 12B, and a lateral rib 12C.

A plurality of the lateral ribs 12A are provided on the rear end (corresponding to the other end) side of the axial center of the wing shaft 11 (point C shown in FIG. 1). In other words, a plurality of the lateral ribs 12A are provided in a range between the midpoint and the rear end of the wing shaft 11. The plurality of lateral ribs 12 </ b> A are provided side by side in the axial direction of the blade shaft 11. Further, as shown in FIGS. 1 to 4 (particularly FIG. 1), the plurality of lateral ribs 12A are all provided obliquely with respect to the blade shaft 11. Since the portion of the skirt portion 10 behind the point C is a portion that is particularly susceptible to air when the shuttlecock 1 flies, the plurality of horizontal ribs 12A are arranged on the wing shaft as in the present embodiment. By arranging it obliquely with respect to 11, the shuttlecock 1 is easily rotated during flight. As a result, the number of revolutions can be improved (see examples described later). Further, since the horizontal rib 12A is oblique to the blade shaft 11, the n-th (n is a natural number) horizontal ribs 12A from the rear end are not continuous in the region sandwiching the blade shaft 11. For example, with respect to the central wing shaft 11 in FIG. 1, the rearmost (first from the rear end) lateral rib 12A in the region on the right side (one side in the circumferential direction) in the drawing, The rearmost lateral rib 12 </ b> A of the other side region is connected to a different position in the axial direction of the wing shaft 11. However, the rearmost lateral rib 12A in the right region of the figure is continuous with the third lateral rib 12A from the rear end of the left region of the figure. As described above, it is desirable that the lateral rib 12 </ b> A is continuous through the wing shaft 11. As a result, the strength can be increased and the productivity of the mold can be improved.

In addition, although the horizontal rib 12A of this embodiment is provided in the rear side from the midpoint of the wing shaft 11, it is not restricted to this, You may provide the horizontal rib 12A in the front side from the midpoint. Specifically, the number of rotations can be improved by providing a plurality of lateral ribs 12A in the range from the rear end to about 2/3 of the length of the blade shaft 11.

The horizontal rib 12B is provided at a position closer to the base portion 2 than the plurality of horizontal ribs 12A (frontward from the point C). The horizontal rib 12B is also provided obliquely with respect to the blade shaft 11 in the same manner as the horizontal rib 12A. The lateral rib 12B is formed thicker than the lateral rib 12A. Thereby, it can emphasize (make it easy to recognize) that it is diagonal with respect to the wing shaft 11, and can further improve the rotation speed.

The horizontal rib 12C is provided at a position closest to the base portion 2 (that is, before the plurality of horizontal ribs 12A and the horizontal ribs 12B). The lateral ribs 12 </ b> C are provided so as to be orthogonal to the wing shaft 11. That is, as shown in FIG. 4, the lateral rib 12 </ b> C is formed in an annular shape, and connects the wing shafts 11 while being orthogonal to the wing shaft 11. Thereby, since the length of a rib becomes short compared with the case where the horizontal rib 12C is provided diagonally, weight reduction can be achieved. Further, the rigidity of the shuttlecock 1 can be further increased, and the wing shafts 11 can be made difficult to twist.

The vertical ribs 13 are provided between the adjacent wing shafts 11 (for example, at an intermediate position) substantially parallel to the wing shaft 11. Further, the vertical rib 13 is provided so as to intersect with the plurality of horizontal ribs 12A.

A plurality (two in this embodiment) of the vertical ribs 14 are provided between the adjacent horizontal ribs 12A so as to intersect the horizontal ribs 12A.

Moreover, the 1st blade | wing part H1 and the 2nd blade | wing part H2 are formed in the skirt part 10 by each rib mentioned above.

The first blade portion H1 includes a blade shaft 11, a plurality of ribs 12A, and a vertical rib 13.

On the other hand, in addition to the structure of the 1st blade | wing part H1, the 2nd blade | wing part H2 is comprised by the vertical rib 14 being provided. That is, the 2nd blade | wing part H2 is an area | region (area | region where the density of a rib is large) with many ribs rather than the 1st blade | wing part H1. 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. The boundary (boundary) between the first blade portion H1 and the second blade portion H2 is between the blade shaft 11 and the adjacent blade shaft 11 (vertical rib 13). By forming such a dense and dense region of the blades in the skirt portion 10, the rotational speed can be improved as compared with the case where the entire configuration is uniform (when the aperture ratio is the same).

In the outer peripheral shape of the skirt portion 10 (see FIG. 4), the boundary between the vertical ribs 13 is at the bottom of the valley retracted to the central axis side (inside) of the shuttlecock 1, and the boundary between the wing shafts 11 is outward. Located at the top of the protruding mountain. Further, in the shape of the rear end portion of the skirt portion 10 (see FIG. 1), the boundary of the wing shaft 11 is the bottom of the valley on the base portion 2 side (the top portion of the mountain on the opposite side in the circumferential direction) and is adjacent. There is no part which becomes a trough on the base part 2 side between the wing shafts 11 (the position of the vertical ribs 13 and the like). In this case, since stress is dispersed, durability is improved.

<< Example >>
The skirt part 10 of the shuttlecock 1 of this embodiment was created with a 3D printer, and the rotation speed was measured. Further, as a comparative example, a conventional structure having a lattice-shaped skirt portion (a skirt portion 110 of a shuttlecock 100 described later) was created, and the rotational speed was compared with that of the present embodiment.

<Configuration of Shuttlecock 100 of Comparative Example>
A shuttlecock 100 of a comparative example will be described with reference to the drawings. Again, the side on which the base portion 2 is provided is the front side, and the opposite side is the rear side.

FIG. 5 is a side view of the shuttlecock 100 of the comparative example. FIG. 6 is a perspective view of the shuttlecock 100 as seen from the front. FIG. 7 is a perspective view of the shuttlecock 100 viewed from the rear. FIG. 8 is a front view of the shuttlecock 100 as viewed from the front.

The shuttlecock 100 of the comparative example includes a base portion 2 and a skirt portion 110. Since the base part 2 is the same as that of the above-mentioned embodiment, description is abbreviate | omitted.

The skirt portion 110 of the comparative example has a wing shaft 111, a horizontal rib 112, and a vertical rib 113.

As with the wing shaft 11 of the present embodiment (shuttle cock 1), a plurality (16 in this case) of wing shafts 111 are provided so as to be arranged in an annular shape on the end surface 2A of the base portion 2. 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 112 is a part that connects adjacent wing shafts 111. In this comparative example, the horizontal ribs 112 are provided at a position closer to the base portion 2 than the plurality of horizontal ribs 112A provided on the rear end side of the axial center of the blade shaft 111 and the plurality of horizontal ribs 112A. It has the horizontal rib 112B.

A plurality of vertical ribs 113 are provided between adjacent wing shafts 111. The plurality of vertical ribs 113 are orthogonal to the plurality of horizontal ribs 112A. A plurality of vertical ribs 113 and a plurality of horizontal ribs 112A intersect in a cross shape and are formed in a lattice shape.

The first blade portion H11 and the second blade portion H12 are formed in the skirt portion 110 of the comparative example by these ribs. The second blade portion H12 is an area where the number of vertical ribs 113 is larger (that is, at a narrower interval) than the first blade portion H11 and the density of the ribs is large. In other words, the opening ratio of the second blade portion H12 is smaller than that of the first blade portion H11.

The first blade portion H11 and the second blade portion H12 are alternately arranged in the circumferential direction of the skirt portion 110. The boundary (boundary) between the first blade portion H11 and the second blade portion H12 is between the blade shaft 111 and the adjacent blade shaft 111 (vertical rib 113).

In the outer peripheral shape of the skirt portion 110 of the comparative example (see FIG. 8), the boundary between the adjacent wing shafts 111 (vertical ribs 113) is the bottom of the valley that is retracted to the central axis side (inner side) of the shuttlecock 100. The boundary of the wing shaft 111 is at the top of the mountain protruding outward. Further, in the shape of the rear end portion of the skirt portion 10 (see FIG. 5), the boundary between the adjacent wing shafts 111 is at the bottom of the valley retracted toward the base portion 2, and the boundary between the wing shafts 111 is the base portion 2. It is at the top of the mountain that protrudes to the side away from (the rear side).

That is, in the case of the shuttlecock 100 of the comparative example, the boundary between the adjacent wing shafts 11 is a valley on the base part 2 side (front side), and also on the central axis side (inside) of the shuttlecock 1. It has become. In this case, stress concentrates on the part, and breakage tends to occur. In addition, by making a cut at the end (rear end) of the skirt portion 110, the area ratio of the density can be further adjusted. However, in this case as well, stress concentrates on the cut portion, and it is more likely to break. . If the rear end portion of the skirt portion 110 is broken or scattered due to breakage, the intended function (function of improving the rotational speed) is lost.

On the other hand, in the shuttlecock 1 of the present embodiment, as described above, the boundary between the first blade portion H1 and the second blade portion H2 is at the top of the mountain (wing shaft 11) protruding outward, and this portion is A valley is formed on the base 2 side. That is, between adjacent wing shafts 11 (such as the position of the vertical ribs 13), there is no valley on the base portion 2 side, and when viewed from the side as shown in FIG. The shaft 11 is connected substantially linearly in an oblique direction. For this reason, as described above, the n-th (n is a natural number) lateral ribs 12A from the rear end in the region sandwiching the blade shaft 11 are not continuous. By adopting such a configuration, it is possible to suppress the concentration of stress on the portion between the adjacent wing shafts 11 and to make it less likely to break (suppress breakage) than the shuttlecock 100 of the comparative example. it can.

<Configuration of Shuttlecock 1 of Example>
As examples, shuttlecocks 1 of Examples 1 to 4 below were prepared.

Example 1 is a shuttlecock 1 shown in FIGS.

In Example 2, one longitudinal rib 14 is formed on the second blade part H2 of the shuttlecock 1 of Example 1 (see the second blade part H2 in FIG. 9). That is, the difference in aperture ratio between the first blade portion H1 and the second blade portion H2 is larger than that in the first embodiment.

Example 3 is obtained by changing the shape of the lateral rib 12B in the shuttlecock 1 of Example 2.

FIG. 9 is a side view of the shuttlecock 1 according to the third embodiment. In the third embodiment, one vertical rib 14 is formed more than in FIG. 1 (second embodiment), and a horizontal rib 12B ′ is formed. The lateral rib 12B ′ is configured by adding a film having a width that increases in a curved manner as the distance from the base portion 2 increases on the rear side of the lateral rib 12B.

In Example 4, ribs (vertical ribs 14) are respectively added to the first blade portion H1 and the second blade portion H2 of the shuttlecock 1 of Embodiment 3 (FIG. 9).

FIG. 10 is a side view of the shuttlecock 1 of the fourth embodiment. FIG. 11 is a perspective view of the shuttlecock 1 according to the fourth embodiment as viewed from the front. FIG. 12 is a perspective view of the shuttlecock 1 of the fourth embodiment viewed from the rear. FIG. 13 is a front view of the shuttlecock 1 according to the fourth embodiment as viewed from the front.

<Measurement method of rotation speed>
The number of revolutions was measured when the front side of each shuttle was directed vertically downward and the shuttle floated by applying a wind of 5 to 10 m / s from below. In addition, the rotation speed of each shuttle was measured in a state where the base portion 2 was not provided.

<Measurement results>
Table 1 shows the measurement results of the rotational speeds of the comparative example and the example.

　表１より、前述の実施形態のシャトルコック１（実施例１）では、比較例のシャトルコック１００に比べて回転数が４０％以上向上している。

From Table 1, in the shuttlecock 1 (Example 1) of above-mentioned embodiment, the rotation speed is improving 40% or more compared with the shuttlecock 100 of the comparative example.

Further, in Example 2 where the difference in density (difference in aperture ratio) was increased, the rotational speed was further improved, and in Example 3 where the shape of the lateral rib 12B was changed, the rotational speed was further improved. In Example 4, the rotational speed was almost the same as in Example 3.

From the above results, it can be confirmed that the rotational speed can be improved more than the lattice-shaped one (comparative example) by providing all of the plurality of lateral ribs 12A obliquely with respect to the blade shaft 11 as in the first to fourth embodiments. It was.

=== 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.

DESCRIPTION OF SYMBOLS 1 Shuttle cock 2 Base part 2A End surface 10 Skirt part 11 Wing shaft 12, 12A, 12B, 12B ', 12C Horizontal rib (rib)
13 Longitudinal rib 14 Longitudinal rib 100 Shuttle cock 110 Skirt portion 111 Blade shaft 112, 112A, 112B Horizontal rib 113 Vertical rib H1 First blade portion H2 Second blade portion H11 First blade portion H12 Second blade portion

Claims (7)

A base part;
A skirt portion provided on an end surface of the base portion;
A shuttlecock equipped with
The skirt part is
A plurality of wing shafts arranged in an annular shape on the end surface, each having a plurality of wing shafts having one axial end fixed to the end surface;
A plurality of ribs connecting adjacent wing shafts;
Have
All the ribs in a range between the predetermined position of the wing shaft and the other end are provided obliquely with respect to the wing shaft.
A shuttlecock characterized by that. The shuttlecock according to claim 1,
Using each rib in the range, the first blade portion and the second blade portion having an opening ratio smaller than that of the first blade portion are alternately arranged in the circumferential direction of the skirt portion.
A shuttlecock characterized by that. The shuttlecock according to claim 1 or 2,
The nth rib (n is a natural number) from the other end in the region on the one side in the circumferential direction of the skirt portion with respect to the wing shaft;
The n-th rib from the other end in the region on the other side in the circumferential direction with respect to the wing shaft is connected to a different position in the axial direction of the wing shaft,
A shuttlecock characterized by that. The shuttlecock according to claim 3,
The n-th rib in the one-side region is continuous with the ribs other than the n-th in the other-side region via the wing shaft,
A shuttlecock characterized by that. The shuttlecock according to any one of claims 1 to 4,
On the one end side of the range, a rib having a width larger than each rib of the range is provided obliquely with respect to the wing shaft.
A shuttlecock characterized by that. The shuttlecock according to any one of claims 1 to 5,
The rib closest to the base portion is orthogonal to the wing shaft,
A shuttlecock characterized by that. The shuttlecock according to any one of claims 1 to 6,
The predetermined position is a midpoint of the wing shaft,
A shuttlecock characterized by that.

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