JP6161381B2 - Artificial feather for shuttlecock and shuttlecock for badminton - Google Patents

Description

  The present invention relates to a shuttlecock artificial feather and a badminton shuttlecock.

  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, a shuttlecock using artificial blades of inexpensive and stable quality has been proposed.

  For example, Japanese Patent Laid-Open No. 2012-24157 (Patent Document 1) discloses an artificial feather for a shuttlecock. This artificial feather for shuttlecock has a feather part and a feather shaft part, imitating natural feathers. In the wing shaft portion, the outer shell portion made of a hard material having a relatively high specific gravity relative to the core portion covers the side surface of the core portion made of a soft material having a relatively low specific gravity.

JP 2012-24157 A

  There is a need for an artificial shuttlecock that has the same flight performance as a natural shuttlecock. And the artificial shuttlecock provided with the high durability which can suppress the fall of flight performance with respect to the repeatedly applied impact is calculated | required. Furthermore, an artificial shuttlecock having a hit feeling equivalent to that of a natural shuttlecock is desired.

  However, in the artificial feather for a shuttlecock described in the above publication, the cross section of the wing shaft part composed of the core part and the outer shell part is trapezoidal. Therefore, since the sectional secondary moment of the cross section of the wing shaft portion is small, the bending rigidity of the wing shaft portion is lowered. When the bending rigidity of the wing shaft portion is low, the shuttlecock is greatly deformed when the shuttlecock is hit, and the flight performance of the shuttlecock is reduced. For this reason, the durability of this shuttlecock is insufficient.

  Further, if the elastic modulus of the material of the wing shaft portion is increased in order to increase the bending rigidity of the wing shaft portion, the material becomes hard, and thus the wing shaft portion may be broken. And if a wing shaft part breaks, the flight performance of a shuttlecock will fall. Therefore, even if the elastic modulus of the material of the wing shaft portion is simply increased in order to increase the bending rigidity of the wing shaft portion, the durability of the shuttlecock is insufficient.

  Further, when the elastic modulus of the material of the wing shaft portion is increased, the material becomes hard, so that there is a problem that the hit feeling when hitting the shuttlecock is bad.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an artificial feather for shuttlecock and a shuttlecock for badminton that have high durability and excellent feel.

  The artificial feather for a shuttlecock according to the present invention includes a wing portion and a shaft connected to the wing portion. The shaft includes an inner surface, an outer surface facing the inner surface, a first side surface connecting one end of the inner surface and one end of the outer surface, and a second side surface connecting the other end of the inner surface and the other end of the outer surface. It is out. A part of at least one of the first and second side surfaces has a recess extending in the extending direction of the shaft.

  According to the artificial feather for a shuttlecock of the present invention, at least one part of at least one of the first and second side surfaces has the recessed portion extending in the extending direction of the shaft, and therefore the cross section 2 including the recessed portion. The next moment can be increased. The flight performance and durability of the badminton shuttlecock are greatly influenced by the bending rigidity obtained by multiplying the shaft cross-sectional moment of the artificial cock for the shuttlecock and the elastic modulus. As described above, in the artificial feather for a shuttlecock according to the present invention, since the secondary moment of inertia of the shaft can be increased, the bending rigidity of the shaft can be increased. Therefore, since the deformation of the shaft of the artificial feather for shuttlecock when a hit is applied to the badminton shuttlecock, it is possible to suppress a decrease in the flight performance of the badminton shuttlecock. That is, the deceleration performance and flight trajectory close to those of the natural shuttlecock can be maintained. Therefore, durability of the badminton shuttlecock can be improved.

  In addition, when the bending rigidity of the shaft is increased, the secondary moment of inertia of the shaft can be increased, so that it is not necessary to increase the elastic modulus of the material of the shaft. That is, the shaft can be formed of a material having a small elastic modulus. A badminton shuttlecock having a shaft formed of a soft material having a small elastic modulus can provide a mild feeling upon hitting. And the hit feeling at the time of hitting the shuttlecock for badminton can be improved by providing the axis | shaft which has high bending rigidity while being formed with a soft material.

  In the above shuttlecock artificial feather, at least one of the first and second side surfaces has a recess extending in the extending direction of the shaft. Thereby, the cross-sectional secondary moment of the cross section of the shaft in the extending direction of the shaft can be increased.

  In the artificial feather for shuttlecock described above, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft is at least partially I-shaped. Since the I-shaped cross-sectional shape has a large cross-sectional secondary moment, the cross-sectional secondary moment of the shaft can be increased. Thereby, the bending rigidity of the shaft can be increased without increasing the elastic modulus of the material of the shaft. Further, since the cross-sectional shape is an I-shape, the section modulus is larger and the bending strength is greater than the H-shape having the same cross-sectional area. Thereby, breakage of the shaft can be suppressed.

  In the artificial feather for a shuttlecock described above, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft is a U-shape. The U-shaped cross-sectional shape has a larger cross-sectional secondary moment than the rectangular cross-sectional shape, so that the cross-sectional secondary moment of the shaft can be increased. Thereby, the bending rigidity of the shaft can be increased without increasing the elastic modulus of the material of the shaft. Further, since the cross-sectional shape is a U-shape, the cross-section coefficient is larger and the bending strength is larger than a rectangular cross-sectional shape having the same cross-sectional area. Thereby, breakage of the shaft can be suppressed.

  A badminton shuttlecock 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, an artificial shuttlecock having high durability and excellent hit feeling can be realized.

  As described above, according to the shuttlecock artificial feather and the badminton shuttlecock of the present invention, it is possible to provide high durability and excellent feel.

It is a schematic side view of the shuttlecock for badminton in one embodiment of the present invention. It is a schematic top view of the shuttlecock for badminton in one embodiment of the present invention. It is a schematic side view of the artificial feather for shuttlecock which comprises the shuttlecock for badminton in one embodiment of this invention. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which follows the VI-VI line of FIG. It is a fragmentary sectional view which shows roughly the structure of the part by which the middle thread of the shuttlecock for badminton in one embodiment of this invention is arrange | positioned. It is a flowchart which shows schematically the manufacturing method of the artificial feather | wing for shuttlecocks in one embodiment of this invention. It is a flowchart which shows roughly the manufacturing process of the axis | shaft included in the structural material preparation process shown in FIG. It is a flowchart which shows roughly the manufacturing method of the shuttlecock for badminton in one embodiment of this invention. It is a schematic sectional drawing of the artificial feather for shuttlecocks which comprises the shuttlecock for badmintons in the comparative example 1. It is a schematic sectional drawing of the artificial feather for shuttlecocks which comprises the shuttlecock for badmintons in the comparative example 2. It is a schematic sectional drawing of the artificial feather for shuttlecocks which comprises the shuttlecock for badmintons in the comparative example 3. It is a schematic sectional drawing of the shuttlecock artificial feather | wing which comprises the shuttlecock for badminton in one embodiment of this invention. It is a schematic sectional drawing of the shuttlecock artificial feather which comprises the shuttlecock for badminton in the modification of one embodiment of 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.

  First, a configuration of a badminton shuttlecock in an embodiment of the present invention will be described.

  1 and 2, a badminton shuttlecock (badminton shuttlecock) 1 includes a hemispherical base body 2 and a fixing surface portion 2a whose surface is formed substantially flat in the base body 2. A plurality of shuttlecock artificial feathers (shuttlecock artificial feathers) 3, a fixing string member 4 for fixing the artificial feathers 3 to each other, and a laminated state of the artificial feathers 3 are maintained. And a middle thread 15 for The plurality of artificial feathers 3 (for example, 15 pieces) are arranged in an annular shape along the outer peripheral portion of the fixing surface portion 2 a in the fixing surface portion 2 a of the base body 2. The plurality of artificial feathers 3 are fixed to each other by a fixing string-like member 4. 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, the configuration of the shuttlecock artificial feather constituting the badminton shuttlecock in one embodiment of the present invention will be described in detail.

  Referring to FIG. 3, the artificial feather 3 constituting the shuttlecock 1 shown in FIGS. 1 and 2 has a wing part 5 and a shaft 7 connected to the wing part 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.

  Nylon can be used as the material of the shaft 7, and nylon 12, nylon 11, nylon 10, nylon 610, nylon 612, and nylon 1010 are preferable. For fiber reinforcement, potassium titanate whisker, glass or the like can be added to nylon. Further, polycarbonate, polypropylene, and polyethylene can also be used as the material of the shaft 7.

  The specific gravity of the material of the shaft 7 is preferably 1.3 or less, and more preferably 1.2 or less. Further, the flexural modulus of the material of the shaft 7 is preferably 2000 MPa or more and 6000 MPa or less, and more preferably 3000 MPa or more and 5000 MPa or less.

  With reference to FIGS. 3 and 4, the shaft 7 has an inner member 12, an outer member 13, and an intermediate member 14. The inner member 12 and the outer member 13 are disposed in the inner and outer directions in FIG. 4 with the intermediate member 14 interposed therebetween. The inner member 12 and the outer member 13 are disposed so as to be substantially orthogonal to the intermediate member 14. In the cross-sectional shape, the inner member 12 and the outer member 13 each extend so as to protrude from the intermediate member 14 in the left-right direction of FIG. The inner member 12 and the outer member 13 have substantially the same width. In the left-right direction of FIG. 4, the intermediate member 14 is disposed approximately at the center of the inner member 12 and the outer member 13. The inner member 12, the outer member 13, and the intermediate member 14 have substantially the same thickness. Each of the inner member 12 and the outer member 13 has a taper formed so that the thickness increases in the cross-sectional shape from both ends toward the center. In addition, a round shape is provided at a connection portion between each of the inner member 12 and the outer member 13 and the intermediate member 14.

  The shaft 7 has an inner surface 7 a at the upper end of the inner member 12 and an outer surface 7 b at the lower end of the outer member 13. The outer surface 7b faces the inner surface 7a. Each of the inner surface 7a and the outer surface 7b has one end and the other end in the left-right direction of FIG. That is, in the left-right direction in FIG. 4, one end of the inner surface 7a and one end of the outer surface 7b are arranged on the same side, and the other end of the inner surface 7a and the other end of the outer surface 7b are arranged on the opposite side of the one end. Yes.

  The shaft 7 has a first side surface 7c that connects one end of the inner surface 7a and one end of the outer surface 7b, and a second side surface 7d that connects the other end of the inner surface 7a and the other end of the outer surface 7b. ing. Both the first side surface 7 c and the second side surface 7 d have a recess 11 extending in the extending direction of the shaft 7. The recess 11 is formed by the outer surface of the inner member 12, the side surface of the intermediate member 14, and the inner surface of the outer member 13. The recessed part 11 is arrange | positioned in the center of the direction where the inner surface 7a and the outer surface 7b oppose. The recess 11 is formed in at least a part of the shaft 7 in the extending direction of the shaft 7. In the present embodiment, the recess 11 is continuously formed in the extending direction of the shaft 7 from near or near the front end of the shaft 7 to near or near the rear end.

  As shown in FIG. 4, in one embodiment of the present invention, the cross-sectional shape in a direction substantially perpendicular to the extending direction of the shaft 7 is an I-shape. That is, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft 7 is an I-shape.

  In the artificial feather 3 according to the embodiment of the present invention described above, both the first side surface 7c and the second side surface 7d have the recesses 11, but the first side surface 7c and the second side surface are provided. It is only necessary that at least one of 7d has a recess 11 extending in the extending direction of the shaft 7. That is, both the first side surface 7 c and the second side surface 7 d may have the recess 11, and one of the first side surface 7 c or the second side surface 7 d may have the recess 11. When one of the first side surface 7c and the second side surface 7d has the recess 11, the intermediate member 14 is disposed at one end or the other end of the inner surface 7a and the outer surface 7b of the shaft 7. That is, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft 7 is a U-shape. In this cross-sectional shape, the concave portion 11 is formed on one of the first side surface 7c and the second side surface 7d by the outer surface of the inner member 12, the side surface of the intermediate member 14, and the inner surface of the outer member 13, and the first side surface 7c. Alternatively, the other of the second side surfaces 7 d is formed by the side surface of the inner member 12, the side surface of the intermediate member 14, and the side surface of the outer member 13.

  In the artificial feather 3 according to the embodiment of the present invention, the inner member 12 and the outer member 13 have substantially the same width in the left-right direction in FIG. The width of the external material 13 may be different from each other. In this case, it is preferable that the width of the outer member 13 arranged on the outer peripheral side of the fixing surface portion 2a of the base body 2 is larger than the inner member 12 arranged on the inner peripheral side.

  Referring to FIGS. 5 and 6, the wing part 5 includes a foam layer 92 and a shaft fixing layer 91 arranged so as to sandwich the fixed shaft part 10, and the foam layer 92 and the shaft fixing layer 91 are connected to each other. It has adhesive layers 93 and 94 for fixing. That is, in the wing portion 5, the foam layer 92 and the shaft fixing layer 91 are laminated so as to sandwich the inner surface 7 a and the outer surface 7 b in the direction in which the inner surface 7 a and the outer surface 7 b of the shaft 7 face each other in the fixed shaft portion 10. . And the wing | blade part 5 is extended in the direction in alignment with the inner surface 7a and the outer surface 7b. 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 shown in 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, resin foam, more specifically, 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.

  As the adhesive layers 93 and 94, for example, a double-sided tape can be used. In the artificial feather 3, 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 laminated wings 5 at the portion where the wings 5 are laminated in this way, the 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.

  As shown in FIGS. 1 and 2, the above-described middle thread 15 is arranged on the circumference so as to fix all 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.

  Moreover, although the arbitrary materials, such as cotton and resin, can be used for the middle thread 15, it is preferable to use the thread | yarn made from polyester. 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 30th 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 of 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 of one embodiment of this invention is demonstrated. As shown in FIG. 8, in the method for manufacturing the artificial feather 3, first, a component material preparing 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 (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, the material which is a polyethylene foam, thickness is 0.5 mm, and a fabric weight is 20 g / m < ² > can be used. Further, the basis weight of the double-sided tape to be the adhesive layers 93 and 94 can be 10 g / m ² .

  Moreover, as a manufacturing process of the axis | shaft 7 mentioned above, as shown in FIG. 9, first, a metal mold | die preparation process (S11) is implemented. 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.

  Next, a forming 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 such as nylon can be used. As a result, a shaft is formed inside the mold. 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.

  As a manufacturing method of the base body 2, any conventionally known method can be used. 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 2a of the base body 2. An adhesive is applied around the insertion hole in the fixing surface portion 2a to firmly fix the shaft 7 and the base body 2. As the adhesive, nitrified cotton, epoxy resin, EVA emulsion or the like can be used according to the material of the base body. Further, the plurality of artificial feathers 3 are fixed to each other by a fixing string-like member 4. Further, sewing is performed so that the middle thread 15 for maintaining the overlapping state of the wings 5 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.

  Moreover, as a material of the said fixing member, arbitrary materials, such as resin and a fiber, can be used, for example. 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.

Next, with reference to FIGS. 11 to 15, the operation and effect of the present embodiment will be described in comparison with a comparative example. 11 to 15 respectively correspond to FIG. 11 to 13 show a cross section of the shaft 7 of the shuttlecock artificial feather 3 in Comparative Examples 1 to 3. FIG. 14 and 15 show a section of the shaft 7 of the shuttlecock artificial feather 3 according to the embodiment of the present invention. In FIG. 14, the shape of the cross section of the shaft 7 is shown in a simplified manner. The cross-sectional areas of the shaft 7 shown in FIGS. 11 to 15 are all equal. This cross-sectional area is, for example, 2.25 mm ² .

The shaft 7 of the artificial feather 3 of Comparative Example 1 shown in FIG. 11 has a square cross section. The total width b of this cross section is 1.5 mm, and the total height d is 1.5 mm. The sectional moment of inertia of this section is 0.42 mm ⁴ and the section modulus is 0.56 mm ³ .

The shaft 7 of the artificial feather 3 of the comparative example 2 shown in FIG. 12 has a cross-shaped cross section. The total width b of this cross section is 2.5 mm, and the total height d is 2.5 mm. In the drawing, the width t of the portion extending in the vertical direction is 0.5 mm, and the height s of the portion extending in the left-right direction is 0.5 mm. The sectional moment of inertia of this section is 0.67 mm ⁴ and the section modulus is 0.54 mm ³ .

The shaft 7 of the artificial feather 3 of Comparative Example 3 shown in FIG. 13 has an H-shaped cross section. The total width b of this cross section is 2.5 mm, and the total height d is 2.5 mm. In the drawing, the total width t of the portions extending in the vertical direction is 0.5 mm, and the height s of the portion extending in the horizontal direction is 0.5 mm. Accordingly, in the drawing, the width t / 2 of each of the portions extending in the vertical direction is 0.25 mm. The sectional moment of inertia of this section is 0.67 mm ⁴ and the section modulus is 0.54 mm ³ .

The shaft 7 of the artificial feather 3 according to the embodiment of the present invention shown in FIG. 14 has an I-shaped cross section. The total width b of this cross section is 2.5 mm, and the total height d is 2.5 mm. The width t of the intermediate member 14 is 0.5 mm, and the total height s of the inner member 12 and the outer member 13 is 0.5 mm. Accordingly, the height s / 2 of each of the inner member 12 and the outer member 13 is 0.25 mm. Further, the vertical interval h between the inner member 12 and the outer member 13 is 2 mm. The distance c between one end of the inner member 12 and the outer member 13 and one end side of the intermediate member 14 and the distance c between the other end of the inner member 12 and outer member 13 and the other end side of the intermediate member 14 are both 1 mm. The section moment of inertia of this section is 1.92 mm ⁴ and the section modulus is 1.54 mm ³ .

The shaft 7 of the artificial feather 3 according to the modification of the embodiment of the present invention shown in FIG. 15 has a U-shaped cross section. The total width b of this cross section is 2.5 mm, and the total height d is 2.5 mm. The width t of the intermediate member 14 is 0.5 mm, and the total height s of the inner member 12 and the outer member 13 is 0.5 mm. Accordingly, the height s / 2 of each of the inner member 12 and the outer member 13 is 0.25 mm. Further, the vertical interval h between the inner member 12 and the outer member 13 is 2 mm. The section moment of inertia of this section is 1.92 mm ⁴ and the section modulus is 1.54 mm ³ .

  Compared with the shaft 7 of the artificial feather 3 of Comparative Examples 1 to 3 shown in FIGS. 11 to 13, in the shaft 7 of the artificial feather 3 of one embodiment of the present invention and the modification shown in FIGS. 14 and 15, Although the cross-sectional area is the same as those of Comparative Examples 1 to 3, the cross-sectional secondary moment of the cross section of the shaft 7 is increased.

  That is, according to the shuttlecock artificial feather 3 according to the embodiment and the modification of the present invention, at least a part of at least one of the first side surface 7 c and the second side surface 7 d extends in the extending direction of the shaft 7. Since it has the recessed part 11 extended, the cross-sectional secondary moment of the cross section containing the recessed part 11 can be enlarged. The flight performance and durability of the badminton shuttlecock 1 are greatly influenced by the bending rigidity obtained by multiplying the sectional moment of the shaft 7 and the elastic modulus of the artificial feather 3 for shuttlecock. Therefore, the bending rigidity of the shaft 7 can be increased. Accordingly, since the deformation of the shaft 7 of the shuttlecock artificial feather 3 when a hit is applied to the badminton shuttlecock 1, it is possible to suppress a decrease in the flight performance of the badminton shuttlecock 1. . That is, the deceleration performance and flight trajectory close to those of the natural shuttlecock can be maintained. Therefore, the durability of the badminton shuttlecock 1 can be improved.

  Further, when the bending rigidity of the shaft 7 is increased, since the second moment of section of the shaft 7 can be increased, it is not necessary to increase the elastic modulus of the material of the shaft 7. Can be formed. In the badminton shuttlecock 1 having the shaft 7 formed of a soft material having a small elastic modulus, a mild feeling can be obtained upon hitting. And the hit feeling at the time of hitting the shuttlecock 1 for badminton can be improved by providing the axis | shaft 7 which has high bending rigidity while being formed with a soft material.

  Further, since the shaft 7 has the recess 11, a space is provided in the shaft 7 by the recess 11. The shaft of the waterfowl blade is formed in a hollow (foamed layer), and the artificial feather 3 for shuttlecock is structurally close to the waterfowl blade, so that the hit feeling can be improved.

  In the shuttlecock artificial feather 3 according to the embodiment of the present invention, at least one of the first side surface 7c and the second side surface 7d has the recess 11 extending in the extending direction of the shaft 7, The cross-sectional secondary moment of the cross section of the shaft 7 in the extending direction of the shaft 7 can be increased.

  In the shuttlecock artificial feather 3 according to the embodiment of the present invention, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft 7 is at least partially I-shaped. Since the I-shaped cross-sectional shape has a large cross-sectional secondary moment, the cross-sectional secondary moment of the shaft 7 can be increased. Thereby, the bending rigidity of the shaft 7 can be increased without increasing the elastic modulus of the material of the shaft 7. Further, since the cross-sectional shape is an I-shape, the section modulus is larger and the bending strength is greater than that of the H-shape. Thereby, breakage of the shaft 7 can be suppressed.

  In the artificial feather 3 for shuttlecock according to a modification of the embodiment of the present invention, the cross-sectional shape in a plane perpendicular to the extending direction of the shaft 7 is a U-shape. Since the U-shaped cross-sectional shape has a large cross-sectional secondary moment, the cross-sectional secondary moment of the shaft 7 can be increased. Thereby, the bending rigidity of the shaft 7 can be increased without increasing the elastic modulus of the material of the shaft 7. Further, since the cross-sectional shape is U-shaped, the cross-section coefficient is larger and the bending strength is larger than the rectangular cross-sectional shape. Thereby, breakage of the shaft 7 can be suppressed.

  A badminton shuttlecock 1 according to an embodiment of the present invention includes a hemispherical base body 2 and the shuttlecock artificial feather 3 connected to the base body 2. In this way, an artificial shuttlecock having high durability and excellent hit feeling can be realized. Further, the bases of the shafts 7 of the plurality of artificial feathers 3 are inserted and fixed in the insertion holes in the fixing surface portion 2 a of the base body 2. Then, in order to firmly fix the shaft 7 in the insertion hole, an adhesive is applied around the insertion hole in the fixing surface portion 2a of the base body 2. Since at least a part of at least one of the first side surface 7c and the second side surface 7d has the recess 11 extending in the extending direction of the shaft 7, an anchor effect is obtained by the adhesive flowing into the recess. Thereby, the shaft 7 can be further firmly fixed to the insertion hole.

  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.

  1 shuttlecock for badminton, 2 base body, 2a fixing surface, 3 artificial feather for shuttlecock, 4 fixing string member, 5 wings, 7 shafts, 7a inner surface, 7b outer surface, 7c first side surface, 7d Second side surface, 8 wing shaft portion, 10 fixing shaft portion, 11 recessed portion, 12 inner member, 13 outer material, 14 intermediate member, 15 middle thread, 91 shaft fixing layer, 92 foam layer, 93, 94 adhesive layer, 95 Arrow.

Claims (5)

Habe,
A shaft connected to the wing,
The shaft connects an inner surface, an outer surface facing the inner surface, a first side surface connecting one end of the inner surface and one end of the outer surface, a second side connecting the other end of the inner surface and the other end of the outer surface. Two sides,
A part of at least one of the first and second side surfaces has a recess extending in the extending direction of the shaft ,
An artificial feather for a shuttlecock, wherein the shaft is provided with a space by the recess .   2. The shuttlecock artificial feather according to claim 1, wherein at least one of the first and second side surfaces has a concave portion extending in an extending direction of the shaft.   The artificial feather for a shuttlecock according to claim 1 or 2, wherein a cross-sectional shape in a plane perpendicular to the extending direction of the shaft is at least partly an I-shape.   The artificial feather for a shuttlecock according to claim 1 or 2, wherein a cross-sectional shape in a plane perpendicular to the extending direction of the shaft is at least partially U-shaped. A hemispherical base body;
The shuttlecock for badminton provided with the artificial feather for shuttlecocks of any one of Claims 1-4 connected to the said base main body.

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