WO2011021512A1

WO2011021512A1 - Artificial feather for shuttlecock, badminton shuttle cock, and method for manufacturing the artificial feather and the badminton shuttlecock

Info

Publication number: WO2011021512A1
Application number: PCT/JP2010/063313
Authority: WO
Inventors: 吉田　聡; 小川　雅央; 隆外村
Original assignee: 美津濃株式会社
Priority date: 2009-08-18
Filing date: 2010-08-05
Publication date: 2011-02-24
Also published as: JP5170459B2; JP2011036591A; EP2462997A4; KR20120043105A; CN102625724A; EP2462997A1

Abstract

Provided are: an artificial feather for a shuttlecock, having excellent flight performance and high durability; a badminton shuttle cock; and a method for manufacturing the artificial feather and the badminton shuttlecock. An artificial feather for a shuttlecock is provided with a vane section and a shaft which is connected to the vane section. A cross-section along a plane perpendicular to the direction in which the shaft extends has a cross-like or T-like shape. Thin-walled sections (14) which form the cross-section having the cross-like or T-like shape and have a smaller thickness than the body section (13) are formed integrally with the body section (13) so as to protrude from the side surfaces thereof.

Description

Artificial feather for shuttlecock, shuttlecock for badminton, and manufacturing method thereof

The present invention relates to an artificial feather for shuttlecock, a shuttlecock for badminton, and a method for producing them, and more specifically, an artificial feather for shuttlecock, a shuttlecock for badminton, and their production having excellent flight characteristics and durability. Regarding the method.

Conventionally, as badminton shuttlecocks, there are known shuttlecocks that use waterfowl blades (natural shuttlecocks) and artificially manufactured blades made of nylon resin (artificial shuttlecocks). Yes. A natural shuttlecock is more expensive than a shuttlecock using artificial feathers because it takes time to obtain a certain quality of such natural feathers. In addition, the supply of waterfowl feathers has been drastically reduced in recent years due to changes in the food situation of waterfowl feather supply countries and the large-scale disposal of waterfowl caused by the bird flu epidemic. It has become a thing. Therefore, shuttlecocks using artificial blades of inexpensive and stable quality have been proposed (for example, Japanese Utility Model Publication No. 54-136060 (Patent Document 1), Japanese Utility Model Publication No. 2-29974 (Patent Document 2)). And Japanese Patent Application Laid-Open No. 2008-206970 (Patent Document 3)).

Patent Document 1 discloses that a thin piece is disposed so as to protrude from a side surface of an artificial blade shaft (a shaft having a substantially rectangular cross section) in order to improve the flight characteristics of the artificial shuttlecock. Moreover, in patent document 2, in order to generate the rotational force at the time of flight of a shuttlecock about the axis | shaft of the shuttlecock of an artificial shuttlecock, it is set as the rhombus shape which deform | transformed the cross-sectional shape of the said axis | shaft, An arrangement that is inclined with respect to the circumference of the arrangement is disclosed. Moreover, in patent document 3, the structure which makes the state which partially embed | buried the nonwoven fabric used as a blade | wing with respect to the artificial blade | wing of an artificial shuttlecock is disclosed.

Japanese Utility Model Publication No. 54-136060 Japanese Utility Model Publication No. 2-29974 JP 2008-206970 A

However, in the artificial shuttlecock shown in Patent Documents 1 to 3, the strength of the artificial feather was still insufficient with respect to the natural feather. On the other hand, the shaft shape of the artificial feather has a great influence on the flight characteristics (especially the rotation characteristics at the time of flight) of the shuttlecock, so that the shape needs to be determined in consideration of the flight characteristics. In order to improve the strength, simply increasing the shaft thickness of the artificial feather increases the overall mass of the shuttlecock, resulting in the flight characteristics of the artificial shuttlecock equivalent to those of a natural shuttlecock. It was difficult to do.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide artificial feathers for shuttlecocks, shuttlecocks for badminton, and the like that have excellent flight characteristics and high durability. It is to provide a manufacturing method.

The artificial feather for a shuttlecock according to the present invention includes a wing part and a shaft connected to the wing part. The cross-sectional shape in a plane perpendicular to the extending direction of the shaft is a cross shape or a T shape. A thin-walled portion that is thinner than the main body that forms a cross-shaped or T-shaped cross-sectional shape on the shaft is formed integrally with the main body so as to protrude from the side surface of the main body.

In this way, by setting the cross-sectional shape of the shaft to a cross shape or a T-shape, it is possible to increase the shaft rigidity while suppressing an increase in the total mass of the shaft. Furthermore, the air resistance of the artificial feather for controlling the flight characteristics of the shuttlecock can be appropriately adjusted by forming the thin portion so as to protrude from the side surface of the main body portion of the shaft. And since such a thin part can make thickness thinner than a main-body part, the increase in the mass of a shaft can be suppressed. As a result, an artificial feather that constitutes an artificial shuttlecock with excellent flight characteristics is realized by improving the rigidity of the artificial feather shaft and adjusting the air resistance of the artificial feather while suppressing an increase in the mass of the artificial feather. it can.

A shuttlecock for badminton according to the present invention includes a hemispherical base body and the artificial feather for the shuttlecock connected to the base body. In this way, it is possible to realize an artificial shuttlecock having flying characteristics equivalent to those of a natural shuttlecock using natural blades and sufficient durability.

The method for manufacturing an artificial feather for a shuttlecock according to the present invention includes a step of preparing a shaft and a step of connecting a wing portion to the shaft. The step of preparing the shaft includes a step of preparing a mold for molding a shaft whose cross-sectional shape in a plane perpendicular to the extending direction of the shaft is a cross shape or a T shape, and the mold is used. Forming a shaft by performing injection molding or injection compression molding. In the step of preparing the mold, a gap is formed in the mold to form a thin part protruding from the side surface of the main body part that is thinner than the main body part that forms a cross-shaped or T-shaped cross-sectional shape on the shaft. ing. In the step of forming the shaft, the shaft in which the thin portion protrudes from the side surface of the main body portion is formed by performing injection molding or injection compression molding. In this way, the shuttlecock artificial feather according to the present invention can be manufactured.

A badminton shuttlecock manufacturing method according to the present invention includes a step of preparing a hemispherical base body, a step of manufacturing shuttlecock artificial feathers using the shuttlecock artificial feather manufacturing method, and a base body Connecting a shuttlecock artificial feather. In this way, the badminton shuttlecock according to the present invention can be manufactured.

According to the present invention, it is possible to obtain an artificial feather for shuttlecock and a shuttlecock for badminton that have excellent flight characteristics and high durability.

It is a side surface schematic diagram which shows embodiment of the shuttlecock by this invention. FIG. 2 is a schematic top view of the shuttlecock shown in FIG. 1. FIG. 3 is a schematic plan view showing an embodiment of an artificial feather for a shuttlecock according to the present invention, which constitutes the shuttlecock 1 shown in FIGS. 1 and 2. FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 3. FIG. 4 is a schematic cross-sectional view taken along line VI-VI in FIG. 3. FIG. 3 is a partial cross-sectional schematic diagram showing a configuration of a portion where a middle thread of the shuttlecock shown in FIGS. 1 and 2 is arranged. FIG. 6 is a flowchart for explaining a method of manufacturing the artificial feather shown in FIGS. 3 to 5. FIG. It is a flowchart for demonstrating the formation process of the axis | shaft included in the structural material preparation process (S10) shown in FIG. It is a flowchart for demonstrating the manufacturing method of the shuttlecock 1 shown in FIG. 1 and FIG. It is a cross-sectional schematic diagram which shows the 1st modification of the artificial feather | wing which comprises embodiment of the shuttlecock by this invention. It is a cross-sectional schematic diagram which shows the 2nd modification of the artificial feather | wing which comprises embodiment of the shuttlecock by this invention. It is a cross-sectional schematic diagram which shows the 3rd modification of the artificial feather | wing which comprises embodiment of the shuttlecock by this invention. It is a cross-sectional schematic diagram which shows the 4th modification of the artificial feather | wing which comprises embodiment of the shuttlecock by this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

An embodiment of a shuttlecock according to the present invention will be described with reference to FIGS.
1 and 2, a shuttlecock 1 according to the present invention includes a hemispherical base body 2 and a plurality of fixing surfaces connected to a fixing surface portion having a substantially flat surface in the base body 2. An artificial feather 3 for the shuttlecock, a fixing string-like member for fixing the plurality of artificial feathers 3 to each other, and a middle thread 15 for maintaining the laminated state of the plurality of artificial feathers 3. The plurality (for example, 16 pieces) of artificial feathers 3 are arranged in an annular shape along the outer peripheral portion of the fixing surface portion in the fixing surface portion of the base body 2. The plurality of artificial feathers 3 are fixed to each other by a string-like member. The plurality of artificial feathers 3 are arranged such that the distance between them increases as the distance from the base body 2 increases (the inner diameter of the cylindrical body formed by the plurality of artificial feathers 3 increases as the distance from the base body 2 increases). Has been.

The middle thread 15 acts as a fixing member for maintaining the laminated state of the plurality of artificial feathers 3. That is, the middle thread 15 is disposed so as to define the positional relationship between the plurality of artificial feathers 3 as will be described later.

Next, an embodiment of the artificial feather for a shuttlecock according to the present invention will be described with reference to FIGS.

Referring to FIGS. 3 to 6, the artificial feather 3 constituting the shuttlecock 1 shown in FIGS. 1 and 2 includes a wing portion 5 and a shaft 7 connected to the wing portion 5. The shaft 7 includes a wing shaft portion 8 arranged so as to protrude from the wing portion 5, and a fixed shaft portion 10 connected to the wing portion 5 at a substantially central portion of the wing portion 5. The wing shaft portion 8 and the fixed shaft portion 10 are arranged so as to extend in the same line, and constitute one continuous shaft 7. As shown in FIGS. 4 and 5, the shaft 7 has a cross-shaped cross section in a direction substantially perpendicular to the extending direction of the shaft 7. That is, as shown in FIGS. 4 and 5, in the cross-sectional shape of the shaft 7, a relatively thick thickness from the central shaft portion 11 to the vertical direction in FIG. And a thick rib portion 12a having a thickness in the circumferential direction of the concentric circle.

Further, the thin rib portion having a relatively thin thickness (the thickness in the vertical direction in FIG. 4 (or in the circumferential direction of a concentric circle with the central shaft portion 11 as the center)) in the left-right direction in FIG. 4 from the central shaft portion 11. 12b is formed to protrude. The two thick rib portions 12a are formed so as to extend from the central shaft portion 11 in opposite directions. The two thin rib portions 12b are also formed so as to extend from the central shaft portion 11 in opposite directions. The thin rib portion 12b is formed so as to extend in a direction intersecting with the extending direction of the thick rib portion 12a (more specifically, a direction orthogonal). The rib part 12 is comprised from the thick rib part 12a and the thin rib part 12b. Further, the main body 13 of the shaft 7 is constituted by the plurality of rib portions 12 and the central shaft portion 11. The cross-sectional shape of the main body 13 is a so-called cross shape.

Further, a thin portion 14 is formed at the outer peripheral end of the thin rib portion 12b as shown in FIGS. 4 and 5 (that is, protruding from the side wall of the main body portion 13). The thickness of the thin portion 14 is further thinner than the thickness of the thin rib portion 12b. The thin portion 14 is formed integrally with the thin rib portion 12b. Further, the thin portion 14 is formed so that the surface of the thin portion 14 is substantially flush with the side surface (upper side surface in FIG. 4) of the thin rib portion 12b. The thickness of the thin portion 14 can be set to, for example, 0.03 mm to 0.1 mm, and more preferably 0.04 mm to 0.07 mm. The widths W1 and W3 of the thin portion 14 can be set to, for example, 0.1 mm or more and 0.5 mm or less, more preferably 0.2 mm or more and 0.3 mm or less.

Thus, by making the cross-sectional shape of the main body 13 of the shaft 7 substantially cross-shaped, the rigidity of the shaft 7 can be increased while suppressing an increase in the total mass of the shaft 7. Further, by forming the thin portion 14 so as to protrude from the side surface of the main body portion 13 of the shaft 7, the air resistance of the artificial feather 3 for controlling the flight characteristics of the shuttlecock 1 can be adjusted as appropriate. And since such a thin part 14 is made thinner than the main-body part 13, the increase in the mass of the axis | shaft 7 can be suppressed. As a result, the shuttlecock 1 having excellent flight characteristics is configured by improving the rigidity of the shaft 7 of the artificial feather 3 and adjusting the air resistance of the artificial feather 3 while suppressing an increase in the mass of the artificial feather 3. The artificial feather 3 can be realized.

The width W of the shaft 7 in the direction in which the thin rib portion 12b extends (left and right direction in FIG. 4) is the sum of the widths W1 and W2 of the thin portion 14 and the width W3 of the main body portion 13. The width W of the shaft 7 is larger than the width (height) T of the shaft 7 in the direction in which the thick rib portion 12a extends (the vertical direction in FIG. 4).

4, the width W1 of one (left side) thin portion 14 and the width W2 of the other (right side) thin portion 14 may be the same value, or may be different values. Moreover, although the thin part 14 may be formed in the full length of the axis | shaft 7, it is preferable to be formed in the wing shaft part 8 which is a part exposed to the exterior at least. The thin portion 14 may be formed only on one side, or may be formed partially (for example, intermittently) in the extending direction of the shaft 7 instead of the entire length of the shaft 7.

As shown in FIG. 5 and FIG. 6, the wing portion 5 includes a foam layer 92 and a shaft fixing layer 91 arranged so as to sandwich the fixing shaft portion 10, and these foam layer 92 and shaft fixing layer 91 are mutually connected. It consists of

adhesive layers

93 and 94 for fixing. That is, in the wing part 5, the foam layer 92 and the shaft fixing layer 91 are laminated so as to sandwich the fixed shaft part 10. Further, in the wing portion 5, the

adhesive layers

93 and 94 are connected to connect the foam layer 92 and the shaft fixing layer 91 to each other and connect and fix the fixed shaft portion 10 to the foam layer 92 and the shaft fixing layer 91. Is arranged. From a different point of view, in the wing portion 5, the adhesive layer 93 is laminated on the foam layer 92 located on the outer peripheral side when the shuttlecock 1 is configured. On the adhesive layer 93, the fixing shaft portion 10 is disposed so as to be located at a substantially central portion of the adhesive layer 93 and the foam layer 92. The other adhesive layer 94 is arranged so as to extend from the fixed shaft portion 10 to the adhesive layer 93. A shaft fixing layer 91 is disposed on the adhesive layer 94.

As can be seen from FIG. 6, in the artificial feather 3, the shaft 7 is warped toward the foam layer 92 side (that is, the outer peripheral side of the shuttlecock 1). From a different point of view, the shaft 7 is warped so as to be convex toward the shaft fixing layer 91 side. 6 shows a state in which the artificial feather 3 is warped toward the foam layer 92 in the extending direction of the shaft 7, the direction intersecting the extending direction of the shaft 7 (for example, the extending of the shaft 7). In a direction perpendicular to the direction and along the surface of the wing part 5, the wing part 5 is warped toward the foam layer 92 (that is, the wing part 5 protrudes toward the shaft fixing layer 91). It may be warped so that In this case, the state in which the artificial feather 3 is warped in the extending direction of the shaft 7 and the state in which the wing portion 5 is warped in the direction intersecting with the extending direction of the shaft 7 are simultaneously generated. Alternatively, only one of the warpages may occur. Such warping is realized by a conventionally well-known method such as applying heat treatment to the constituent material of the shaft 7 and the wing portion 5 or forming the constituent material of the shaft 7 and the wing portion 5 in a warped state from the beginning. be able to.

Here, as a material constituting the foam layer 92, for example, a resin foam, more specifically, a polyethylene foam (polyethylene foam) can be used. Similarly, a resin foam can be used for the shaft fixing layer 91. For the shaft fixing layer 91, any material such as a film made of a resin or a non-woven fabric can be used other than polyethylene foam, for example.

For the

adhesive layers

93 and 94, for example, double-sided tape can be used. In the artificial feather 3 shown in FIGS. 3 to 6, polyethylene foam is used as the foam layer 92 and the shaft fixing layer 91. The extrusion direction of the polyethylene foam is preferably the direction shown by the arrow 95 in FIGS. In this case, since the shaft 7 is connected and fixed to the wing portion 5 so as to intersect the extrusion direction of the polyethylene foam indicated by the arrow 95, the wing portion 5 is torn in the direction along the extending direction of the shaft 7. Defect occurrence probability can be reduced.

Next, the arrangement of the middle thread 15 will be specifically described with reference to FIG.
As shown in FIG. 7, the middle thread 15 circulates around the shaft 7 of the artificial feather 3 and is a portion of the wing portion 5 in a state of being stacked on the adjacent artificial feather 3. The wings 5 are arranged so as to pass through regions facing each other (that is, pass between the stacked wings 5). Since the middle thread 15 passes between the stacked wings 5 at the portion where the wings 5 are stacked in this way, the stacking order of the wings 5 is changed during use of the shuttlecock 1 (for example, hitting with a racket) The occurrence of such a problem that the stacking order of the wings 5 is changed by the impact of the above can be suppressed.

1 and 2, the above-described middle thread 15 is arranged on the circumference so as to fix all of the plurality of artificial feathers 3 arranged in an annular shape to each other. The intermediate thread 15 can be arranged as shown in FIGS. 1 and 2, for example, by an operator sewing it with a needle or the like. In this way, it is possible to obtain the shuttlecock 1 exhibiting excellent durability by suppressing the occurrence of the problem that the stacking order of the wing parts 5 changes during use of the shuttlecock 1.

The middle thread 15 arranged on the circumference is connected to one end at the start of sewing and the other end at the end of sewing, and the remaining thread is cut and removed near the knot. It is preferable to form a protective layer on the surface of the knot by applying an adhesive or the like. By forming such a protective layer, it is possible to prevent the knot from being broken when the shuttlecock 1 is hit with a racket.

Further, although any material such as cotton or resin can be used for the middle thread 15, it is preferable to use a polyester thread. Further, it is preferable to use a middle thread 15 that is as light as possible so as not to affect the center of gravity of the shuttlecock 1 as much as possible. For example, as a yarn to be used, a 50th polyester yarn may be used. In this case, the mass of the yarn used as the middle yarn 15 is about 0.02 g. This mass is considered to have little influence on the flight characteristics although there is some influence on the position of the center of gravity of the shuttlecock 1. Moreover, about the arrangement | positioning of the middle thread | yarn 15, the distance from the base main body 2 can be set arbitrarily.

Next, a method for manufacturing the shuttlecock 1 and the artificial feather 3 for the shuttlecock shown in FIGS. 1 and 2 will be described with reference to FIGS.

First, with reference to FIG. 8, the manufacturing method of the artificial feather | wing 3 for shuttlecocks according to this invention is demonstrated. As shown in FIG. 8, in the method for manufacturing the artificial feather 3, first, the component material preparation step (S <b> 10) is performed. In this step (S10), the shaft 7 constituting the artificial feather 3, the sheet material constituting the foam layer 92 and the shaft fixing layer 91 shown in FIGS. 5 and 6, the double-sided tape to be the

adhesive layers

93 and 94 Prepare. In addition, if the planar shape of these sheet-like members and double-sided tape is larger than the size of the wing | blade part 5 shown in FIG. 3, it can be made into arbitrary shapes. As the sheet-like member to be the foam layer 92, for example, a polyethylene foam (a polyethylene foam and formed into a sheet) having a thickness of 1.0 mm and a basis weight of 24 g / m ^{2 is} used. Can be used. Moreover, as a sheet-like member which should become the axis | shaft fixed layer 91, it is a polyethylene foam and can use material with thickness of 0.5 mm and a fabric weight of 20 g / m < ² >. Further, the basis weight of the double-sided tape to be the

adhesive layers

93 and 94 can be 10 g / m ² .

In addition, as a manufacturing process of the shaft 7 described above, as shown in FIG. 9, first, a mold preparation process (S11) is performed. In this step (S11), a mold for forming the shaft 7 is prepared, for example, by injection molding or injection compression molding. The mold prepared here is, for example, a mold divided into an upper mold and a lower mold, and concave portions corresponding to the shape of the shaft 7 are formed on the mold surfaces facing each other. In addition, the concave portion includes a gap for forming a thin portion 14 in a portion where the main body portion 13 of the shaft 7 is formed and an outer peripheral portion of the portion where the main body portion 13 is formed.

Next, a molding step (S12) is performed. In this step (S12), first, the mold prepared as described above is set in an apparatus such as an injection molding machine for injecting resin into the inside (concave portion) of the mold (mold setting step). Next, a resin injection step is performed. That is, the resin is injected from the resin injection port provided in the mold into the recess inside the mold. As the resin, for example, a thermoplastic resin can be used. As a result, a shaft is formed inside the mold. Since the gap for forming the thin portion 14 is formed in the recess of the mold as described above, the thin portion 14 protruding from the side surface is formed on the obtained shaft 7. In this way, the molding step (S12) is performed. Thereafter, the shaft 7 is taken out from the inside of the mold. As a result, the shaft 7 constituting the artificial feather 3 can be obtained.

Next, a bonding step (S20) is performed as shown in FIG. In this step (S20), a double-sided tape to be the adhesive layer 93 is stuck on the main surface of the sheet-like member to be the foam layer 92. Then, the fixing shaft portion 10 of the shaft 7 is disposed on the double-sided tape. Further, a sheet-like member to be the shaft fixing layer 91 in which a double-sided tape to be the adhesive layer 94 is attached to the surface facing the fixing shaft portion 10 is laminated and bonded. As a result, it is possible to obtain a structure in which the fixed shaft portion 10 of the shaft 7 is sandwiched and fixed between the sheet-like member to be the foam layer 92 and the sheet-like member to be the shaft fixing layer 91.

Next, a post-processing step (S30) is performed. Specifically, an unnecessary portion (that is, a region other than the portion to be the wing portion 5) of the laminated sheet-like member to be the wing portion 5 is cut and removed. As a result, the artificial feather 3 as shown in FIGS. 3 to 6 can be obtained. Then, the artificial feather 3 is subjected to a heat treatment such as applying heat from the foam layer 92 side to shrink the foam layer 92 or the like. As a result, a state in which the shaft 7 and the wing part 5 are warped as shown in FIG. 6 can be realized. In addition, in order to implement | achieve the state which the axis | shaft 7 and the wing | blade part 5 curved as shown in FIG. 6, you may use another method. For example, a method of using a shaft 7 that is warped from the beginning may be employed.

Next, a method for manufacturing the shuttlecock 1 shown in FIGS. 1 and 2 will be described with reference to FIG. As shown in FIG. 10, a preparatory process (S100) is first implemented. In this preparation step (S100), constituent members of the shuttlecock 1 such as the base body 2 (tip member) of the shuttlecock 1 and the artificial feather 3 described above are prepared.

The base body 2 can be produced by any known method. For example, a natural material such as cork can be used as a material to be the base body 2. Further, an artificial resin or the like may be used as the material of the base body 2. When an artificial resin is used as the material of the base body 2, the base body 2 can be formed using any conventionally known processing method. For example, first, a block of a material to be the base body 2 is prepared, and a rough shape is formed by cutting. At this time, processing is performed in consideration of the height of the hemispherical portion of the tip portion. And you may use the method of forming the insertion hole for inserting the artificial feather | wing 3 further by cutting. Moreover, when using the artificial resin mentioned above, an ionomer resin foam, EVA (ethylene vinyl acetate copolymer), polyurethane, PVC (polyvinyl chloride), polyethylene, a polypropylene etc. can be used, for example. Moreover, as a manufacturing method of the artificial feather 3, the manufacturing method shown in FIG. 8 mentioned above can be used.

Next, an assembly process (S200) is performed. In the assembly step (S200), the roots of the shafts 7 of the plurality of artificial feathers 3 described above are inserted and fixed in the insertion holes in the fixing surface portion of the base body. Further, the plurality of artificial feathers 3 are fixed to each other by a string-like member. Further, the sewing is performed so that the middle thread 15 for maintaining the overlapping state of the wings is arranged as shown in FIG. In this way, the shuttlecock 1 shown in FIGS. 1 and 2 can be manufactured. The fixing member that fixes the plurality of artificial feathers 3 to each other is not limited to the string-like member as described above, and any member such as a ring-like member may be used.

Also, as the material of the fixing member, for example, any material such as resin or fiber can be used. For example, an aramid fiber or glass fiber may be used as the string-like member, and the aramid fiber or glass fiber may be impregnated with a resin (for example, a thermosetting resin), and the resin may be cured to form a FRP fixing member. . By using FRP in this way, the strength and rigidity of the fixing member can be improved. Moreover, as a thermosetting resin, an epoxy resin and a phenol resin can be used, for example. If a thermosetting resin is used for FRP in this way, when a heating process is performed in the process for fixing the fixing member to the shaft 7, the fixing member can be easily made FRP with the thermosetting resin at the same time. Can be done.

Referring to FIGS. 10 to 14, first to fourth modifications of the artificial feather constituting the embodiment of the shuttlecock according to the present invention will be described. 10 to 14 correspond to FIG. 4, respectively.

11 has basically the same structure as the artificial feather 3 shown in FIGS. 3 to 6, but the cross-sectional shape of the main body 13 of the shaft 7 is different. Specifically, the main body portion 13 of the shaft 7 shown in FIG. 11 has two thin rib portions 12b extending from the central shaft portion 11 in the left-right direction, while the thick rib is formed only on one side from the lower side of the central shaft portion 11. The part 12a extends. In addition, the thin part 14 is formed in the outer peripheral edge part of the thin rib part 12b. The effect similar to that of the artificial feather 3 shown in FIGS. 3 to 6 can also be obtained by using the artificial feather using the shaft whose main body section 13 has a so-called T-shaped cross section.

The artificial feather having the shaft shown in FIG. 12 basically has the same structure as the artificial feather 3 shown in FIG. 11, but is above the central shaft portion 11 (perpendicular to the direction in which the thin rib portion 12b extends). The protrusion 16 is different in that it extends in the direction or the direction opposite to the direction in which the thick rib portion 12a extends. By forming the protruding portion 16 included in such a rib portion 12, the same effect as that obtained by the artificial feather using the shaft shown in FIG. 11 can be obtained, and the vertical direction (thick rib portion in FIG. 12) can be obtained. 12a and the direction in which the protrusion 16 extends), the rigidity of the shaft 7 can be further increased.

The artificial feather provided with the shaft shown in FIG. 13 basically has the same structure as the artificial feather 3 shown in FIGS. 3 to 6, but two thin-walled portions 14 formed on both sides of the body portion 13 of the shaft 7. The widths W1 and W2 are different from the artificial feathers shown in FIGS. Specifically, the width W1 of the thin portion 14 formed on the left side of the main body 13 of the shaft 7 shown in FIG. 13 is wider than the width W2 of the thin portion 14 formed on the right side of the drawing. Yes. In this way, the same effect as the artificial feather 3 shown in FIGS. 3 to 6 can be obtained, and the difference in air resistance between the right side and the left side of the shaft 7 when viewed from the central shaft portion 11 of the shaft can be obtained. Since it can be provided, the variation of the air resistance pattern in the artificial feather can be enriched. For this reason, in the shuttlecock using the artificial feather 3, the control range of the flight characteristics can be further widened.

The artificial feather having the shaft shown in FIG. 14 basically has the same structure as the artificial feather 3 shown in FIGS. 3 to 6, but two thin-walled portions 14 formed on both sides of the main body portion 13 of the shaft 7. Is different from the artificial feather shown in FIGS. Specifically, the thin portion 14 formed on the side surface of the main body portion 13 of the shaft 7 shown in FIG. 14 is flush with the side surface of the thin rib portion 12b (the flat side surface of the thin rib portion 12b in FIG. 14). Not arranged to compose. The thin wall portion 14 of the shaft shown in FIG. 14 is disposed at a position where it is connected to the side surface of the thin rib portion 12b via a step. Even with such a configuration, the same type of effect as the artificial feather 3 shown in FIGS. 3 to 6 can be obtained.

Although there are portions that partially overlap the above-described embodiment, the characteristic configurations of the present invention are listed below.

The shuttlecock artificial feather 3 according to the present invention includes a wing portion 5 and a shaft 7 connected to the wing portion 5. A cross-sectional shape (see, for example, FIG. 4) in a plane perpendicular to the extending direction of the shaft 7 is a cross shape (see FIG. 4) or a T shape (see FIG. 11). A thin-walled portion 14 that is thinner than the main body 13 that forms a cross-shaped or T-shaped cross-section on the shaft 7 is formed integrally with the main body 13 so as to protrude from the side surface of the main body 13.

In this way, the rigidity of the shaft 7 can be increased while suppressing the increase in the total mass of the shaft 7 by making the cross-sectional shape of the shaft 7 a cross shape or a T-shape. Furthermore, by forming the thin portion 14 so as to protrude from the side surface of the main body portion 13 of the shaft 7, the air resistance of the artificial feather 3 for controlling the flight characteristics of the shuttlecock 1 can be adjusted as appropriate. And since such a thin part 14 can make thickness thinner than the main-body part 13, the increase in the mass of the axis | shaft 7 can be suppressed. As a result, the artificial shuttlecock 1 having excellent flight characteristics is formed by improving the rigidity of the shaft 7 of the artificial feather 3 and adjusting the air resistance of the artificial feather 3 while suppressing an increase in the mass of the artificial feather 3. The artificial feather 3 can be realized.

In the shuttlecock artificial feather 3, the main body 13 may include a central shaft portion 11 and a plurality of rib portions 12 protruding from the side surface of the central shaft portion 11. The plurality of rib portions 12 are thick rib portions 12a that are relatively thick in a direction perpendicular to the radial direction from the central shaft portion 11 to the outside in a plane perpendicular to the extending direction of the shaft 7. The thin rib portion 12b having a relatively small thickness may be included. The thin portion 14 may be formed so as to protrude from the outer peripheral side surface of the thin rib portion 12b.

In this case, the rigidity of the shaft 7 in the protruding direction of the thick rib portion 12a can be particularly improved. Further, since the thin rib portion 12b of the main body portion 13 of the shaft 7 is disposed in the direction in which the thin portion 14 protrudes (left and right direction in FIG. 4), the thickness of all the rib portions 12 included in the main body portion 13 is disposed. The thickness of the shaft 7 can be reduced as compared with the case where the thickness of the shaft 7 is uniformly increased. For this reason, the width | variety (width | variety W in FIG. 4) in the direction in which the thin part 14 protrudes (direction where the thin rib part 12b protrudes) can fully be enlarged, restrict | limiting the mass of the axis | shaft 7 to a predetermined range. .

In the shuttlecock artificial feather 3, as shown in FIG. 4, the thin portion 14 may be formed so as to protrude along the surface extending in the radial direction in the thin rib portion 12b.

In this case, from the viewpoint of a resistor against air, the thin portion 14 and the thin rib portion 12b can be regarded as a continuous integral resistor. Moreover, when forming the thin part 14, compared with the case where the thin part 14 is formed so as not to follow the surface of the thin rib part 12b, for example, the shaft 7 having the thin part 14 can be easily formed using a mold. Can be formed.

In the shuttlecock artificial feather 3, the total width W of the main body portion 13 and the thin portion 14 along the protruding direction of the thin rib portion 12b in the plane perpendicular to the extending direction of the shaft 7 is the thick rib. It may be larger than the width (height T in FIG. 4) of the main body 13 along the protruding direction of the portion 12a.

In this case, the air resistance of the shaft 7 is increased in a direction different from the protruding direction of the thick rib portion 12a (that is, the direction in which the rigidity of the shaft 7 is relatively high) (that is, the protruding direction of the thin rib portion 12b). Thus, the substantial width W of the shaft 7 for generating the air resistance can be ensured widely. Further, when the shaft having the same diameter as the width W in the protruding direction of the thin rib portion 12b is used, or when the thickness of the thin rib portion 12b is set to be equal to the thickness of the thick rib portion 12a, the shaft 7 Increase in mass can be suppressed.

In the shuttlecock artificial feather 3, the main body portion 13 may include a central shaft portion 11 and a plurality of rib portions 12 protruding from the side surface of the central shaft portion 11. As shown in FIGS. 4, 5, 11 to 13, etc., the thin-walled portion 14 protrudes along a surface extending radially outward from the central shaft portion 11 in at least one of the plurality of rib portions 12. It may be formed.

In this case, the substantial width W of the shaft 7 can be changed by forming the thin portion 14 so as to protrude from at least one of the plurality of rib portions 12. As a result, the air resistance of the artificial feather 3 for controlling the flight characteristics of the shuttlecock 1 can be adjusted as appropriate.

In the shuttlecock artificial feather 3, the total width of the main body portion 13 and the thin portion 14 along the protruding direction of the rib portion 12 in which the thin portion 14 is formed in a plane perpendicular to the extending direction of the shaft 7. W may be larger than the width (height T in FIG. 4) of the main body 13 along the protruding direction of the other ribs 12 where the thin part 14 is not formed.

In this case, in order to increase the air resistance of the shaft 7 in the projecting direction of the rib portion 12 in which the thin-walled portion 14 is formed (for example, the horizontal direction in FIGS. 4 and 11 to 13), the air resistance is generated. A substantial width W of the shaft 7 can be secured.

A badminton shuttlecock 1 according to the present invention includes a hemispherical base body 2 and the shuttlecock artificial feather 3 connected to the base body 2. In this way, it is possible to realize an artificial shuttlecock 1 having a flight characteristic equivalent to that of a natural shuttlecock using natural blades and sufficient durability.

The method for manufacturing an artificial feather for a shuttlecock according to the present invention includes a step of preparing a shaft (S10, S11, S12) and a step of connecting a wing portion to the shaft (S20). The step of preparing the shaft (S10, S11, S12) is a step of preparing a mold for molding a shaft having a cross-shaped or T-shaped cross section in a plane perpendicular to the extending direction of the shaft. (S11) and a step (S12) of forming a shaft by performing injection molding or injection compression molding using the mold. In the step of preparing the mold (S11), the shaft 7 is formed with a thin portion 14 that is thinner than the main body portion 13 that forms a cross-shaped or T-shaped cross section and protrudes from the side surface of the main body portion 13. A gap is formed in the mold. In the step of forming the shaft (S12), the shaft 7 in which the thin portion 14 protrudes from the side surface of the main body portion 13 is formed by performing injection molding or injection compression molding. In this way, the shuttlecock artificial feather 3 according to the present invention can be manufactured.

The badminton shuttlecock manufacturing method according to the present invention includes a step of preparing a hemispherical base body (S100), and a step of manufacturing the shuttlecock artificial feather using the shuttlecock artificial feather manufacturing method ( S100) and a step (S200) of connecting the shuttlecock artificial feather to the base body. In this way, the badminton shuttlecock 1 according to the present invention can be manufactured.

Next, in order to confirm the effect of the shuttlecock artificial feather and the shuttlecock according to the present invention, the following experiment was conducted.

(Experiment contents)
A shuttlecock using artificial feathers according to an embodiment of the present invention and two types of shuttlecocks as comparative examples were prepared, air was blown from below the cylinder by a blower, the shuttlecock was floated and rotated, and contactless rotational speed measurement was performed. The rotational speed (number of rotations) of the shuttlecock was measured using a vessel.

(Prepared sample)
A shuttlecock using the artificial feather 3 shown in FIGS. 3 to 6 was prepared as a sample of the example of the present invention. The width W3 (see FIG. 4) of the body portion 13 of the shaft 7 of the artificial feather 3 is 2.5 mm, the height T is 2.5 mm, and the central portion (in the radial direction viewed from the central shaft portion 11) of the thick rib portion 12a. 4), the thickness of the central portion of the upper thick rib portion 12a in FIG. 4 is 0.8 mm, and the thickness of the central portion of the lower thick rib portion 12a in FIG. 4 is 0.55 mm. The thickness of the thin rib portion 12b was 0.4 mm, and the widths W1 and W2 of the thin wall portion 14 were each 0.3 mm. Moreover, the thickness of the thin part 14 was 0.05 mm.

The shaft fixing layer 91 constituting the wing part 5 of the artificial feather 3 is made of polyethylene foam, and has a thickness of 0.5 mm and a basis weight of 20 g / m ² . The material of the foam layer 92 was polyethylene foam, the thickness was 1.0 mm, and the basis weight was 24 g / m ² . Further, double-sided tape was used as the

adhesive layers

93 and 94. As the characteristics of the double-sided tape, those having a thickness of 10 μm and a basis weight of 10 g / m ² were used. And the shuttlecock of the structure shown in FIG. 1 and FIG. 2 was prepared using such an artificial feather.

Further, as a sample of Comparative Example 1, an artificial feather 3 was manufactured using a processed shaft obtained by scraping the thin portion 14 from a shaft having the same configuration as the shaft used for the sample of the above example. Except for the processed shaft, the configuration was the same as that of the artificial feather 3 used for the sample of the above-described example. And the shuttlecock provided with the structure similar to the sample of an Example was prepared using the artificial feather | wing 3 as such a comparative example.

Further, as a sample of Comparative Example 2, an artificial feather and a shuttlecock were prepared using a shaft having a configuration in which the thin portion 14 was removed from the shaft used in the sample of the above-described example. In addition, about the axis | shaft prepared here, as a metal mold | die used for injection molding, the metal mold | die of a structure different from the axis | shaft in the artificial feather of an Example (that is, the metal mold | die of the structure which has not formed the clearance gap for the thin part 14) Type).

(result)
About the shuttlecock of each sample, air was flowed from the lower part of the cylinder with a blower at 7 m / second, the shuttlecock was floated and rotated, and the number of revolutions of the shuttlecock was measured using a non-contact revolution meter. For the measurement, five shuttlecocks were prepared for each sample, and the average number of rotations of the five was calculated.

As a result, the average rotational speed of the sample of the example was 477 rpm. The flight trajectory of the shuttlecock was also relatively close to that of the natural shuttlecock.

On the other hand, the average rotational speed of the sample of Comparative Example 1 was 317 rpm, and the average rotational speed of the sample of Comparative Example 2 was 252 rpm. In addition, due to such a difference in the number of revolutions, the trajectory at the time of flight of the shuttlecock of the comparative example was different from the trajectory at the time of flight of the shuttlecock of the example, and different from the trajectory at the time of flight of the natural shuttlecock. . In addition, when the rotational speed was less than 300 rpm, the shuttlecock easily sways during flight, and the trajectory during flight tended to be unstable.

In addition, all the samples showed sufficient durability without any shape collapse during the test.

As a result, it was found that the samples of the examples of the present invention showed sufficient durability and flight characteristics relatively close to those of a natural shuttlecock.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The present invention is advantageously applied to a badminton shuttlecock using artificial feathers having flying characteristics and durability equivalent to those of a badminton shuttlecock using waterfowl feathers.

1 shuttlecock, 2 base body, 3 artificial feather, 5 wings, 7 shafts, 8 wing shafts, 10 fixed shafts, 11 central shafts, 12 ribs, 12a thick ribs, 12b thin ribs, 13 Body part, 14 thin part, 15 middle thread, 16 projecting part, 91 shaft fixing layer, 92 foam layer, 93, 94 adhesive layer, 95 arrows.

Claims

Feather (5),
A shaft (7) connected to the wing (5),
The cross-sectional shape in a plane perpendicular to the extending direction of the axis (7) is a cross shape or a T shape,
The main body so that a thin-walled portion (14) that is thinner than the main body portion (13) constituting the cross-shaped or T-shaped cross-sectional shape on the shaft (7) protrudes from a side surface of the main body portion (13). A shuttlecock artificial feather formed integrally with the portion (13).
The main body (13) includes a central shaft portion (11) and a plurality of rib portions (12) protruding from the side surface of the central shaft portion (11).
The plurality of rib portions (12) have a relative thickness in a direction perpendicular to the radial direction from the central shaft portion (11) to the outside in a plane perpendicular to the extending direction of the shaft (7). A thick rib portion (12a) that is thick and a thin rib portion (12b) that is relatively thin,
The artificial feather for a shuttlecock according to claim 1, wherein the thin portion (14) is formed so as to protrude from an outer peripheral side surface of the thin rib portion (12b).
The shuttlecock artificial feather according to claim 2, wherein the thin wall portion (14) is formed so as to protrude along a surface extending in the radial direction in the thin rib portion (12b).
Total width (W) of the main body portion (13) and the thin portion (14) along the protruding direction of the thin rib portion (12b) in a plane perpendicular to the extending direction of the shaft (7). The artificial feather for a shuttlecock according to claim 2, which is larger than the width of the main body portion (13) along the protruding direction of the thick rib portion (12a).
The main body (13) includes a central shaft portion (11) and a plurality of rib portions (12) protruding from the side surface of the central shaft portion (11).
The thin-walled portion (14) is formed so as to protrude along a surface extending in a radial direction from the central shaft portion (11) outward in at least one of the plurality of rib portions (12). The artificial feather for a shuttlecock according to claim 1,
The main body part (13) and the thin part (14) along the protruding direction of the rib part (12) in which the thin part (14) is formed in a plane perpendicular to the extending direction of the shaft (7). ) And the total width (W) is larger than the width of the main body portion (13) along the protruding direction of the other rib portion (12) where the thin-walled portion (14) is not formed. The artificial feather for a shuttlecock according to claim 5.
A hemispherical base body (2);
The shuttlecock for badminton provided with the artificial feather (3) for shuttlecocks of Claim 1 connected to the said base main body (2).
Preparing the shaft (7) (S10, S11, S12);
Connecting the wings to the shaft (7) (S20),
The step of preparing the shaft (7) (S10, S11, S12)
Preparing a mold for molding a shaft whose cross-sectional shape in a plane perpendicular to the extending direction of the shaft is a cross shape or a T shape (S11);
Forming the shaft by performing injection molding or injection compression molding using the mold (S12),
In the step of preparing the mold (S11), the shaft (7) is thinner than the main body (13) constituting the cross-shaped or T-shaped cross-section, and from the side surface of the main body (13). A gap for forming the protruding thin part (14) is formed in the mold,
In the step of forming the shaft (S12), the shaft (7) in which the thin wall portion (14) protrudes from the side surface of the main body portion (13) is formed by performing the injection molding or the injection compression molding. Manufacturing method of artificial feather for cock.
Preparing a hemispherical base body (2) (S100);
A step (S100) of manufacturing the shuttlecock artificial feather (3) using the shuttlecock artificial feather manufacturing method according to claim 8;
And a step (S200) of connecting the shuttlecock artificial feather (3) to the base body (2).