TWI543802B - Badminton with artificial feathers, badminton and its manufacturing methods - Google Patents

Description

Artificial feather for badminton, badminton shuttlecock and manufacturing method thereof

The present invention relates to an artificial feather for badminton, a badminton shuttlecock, and a manufacturing method thereof. More specifically, it relates to an artificial feather for badminton, a badminton shuttlecock, and a manufacturing method thereof, which have superior flying characteristics and durability.

Previously, badminton badminton players were known to have feathers using seabird feathers (natural badminton) and feathers (artificial badminton) artificially made of nylon resin. Moreover, natural badminton is very hard to obtain natural feathers of a certain quality, so the use of natural feather badminton is higher. In addition, in recent years, the supply of waterfowl feathers has changed in food conditions, or because of the popularity of avian flu, a large number of waterfowls have been culled, thereby reducing the supply of waterfowl feathers and increasing the price of natural badminton. For this reason, it is proposed to use an artificial feather badminton which is inexpensive and stable in quality (see, for example, Patent Document 1 (JP-A-54-136060)-Patent Document 3 (Japanese Patent Publication No. Sho 36-20919)).

Patent Document 1 discloses a thin-walled sheet projecting from the side of an artificial feather shaft (a slightly rectangular cross section) formed by injection molding a soft resin material in order to improve the flying characteristics of the artificial shuttlecock. In the patent document 2 (Japanese Unexamined Patent No. Hei. No. 2-29974), a feather shaft of an artificial feather formed of a synthetic resin such as a polyamide resin is disclosed, and a rotational force is generated when the shuttlecock flies, and the shaft is deformed. Profile shape In the shape, the long axis of the diamond is inclined to the circumference of the artificial feather. Further, Patent Document 3 discloses that a plurality of feather shafts having a rectangular cross section are formed in a ring shape, and a plurality of feather shafts having a rectangular cross section are formed in a ring shape, and the root portion of the feather shaft is integrally formed with a circular substrate, and is also formed at a central portion of the feather shaft. Artificial feathers of artificial badminton that are connected to each other by a ring-shaped reinforcing material. In the patent document 4 (JP-A-2008-206970), the artificial feather of the artificial shuttlecock is opened, and the non-woven layout of the feather is embedded in the inside of the shaft made of resin.

[First technical literature] [Patent Literature]

[Patent Document 1] Japanese Unexamined Publication No. Hei 54-136060

[Patent Document 2] Japanese Real Fair 2-29974

[Patent Document 3] Japanese Shigongzhao No. 36-20919

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2008-206970

However, in the artificial shuttlecocks shown in the above Patent Documents 1 to 4, the artificial feathers are not as strong as natural feathers. In addition, in order to satisfy the badminton specifications or the required flying characteristics (the same flying characteristics as natural badminton), it is difficult to implement measures to increase the strength of the artificial feather shaft. That is, when the thickness of the artificial feather shaft is separately increased in order to increase the strength, the overall quality of the badminton will increase, and as a result, the flying characteristics of the artificial badminton are difficult to be the same as the flying characteristics of the natural badminton.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an artificial feather for badminton, a shuttlecock for badminton, and a method for manufacturing the same, which have high durability and which have high durability.

The inventors conducted research on materials constituting artificial feathers for shuttlecocks, and completed the present invention.

That is, artificial feathers for badminton, such as when the ball is made by a racket, a large impact is applied to the artificial feathers of the shuttlecock, so that the shaft of the artificial feather is easily broken. However, as described above, it is not possible to take measures to increase the axial thickness in order to increase the strength of the shaft. Here, the inventor's goal is not to place a high-rigidity shaft that does not deform even if subjected to the impact, and to review the impact even if the shaft is temporarily deformed by the impact of the racket, it will return to the original shape (ie, bear The impact is elastically deformed, and after the deformation, the possibility of returning to the axis of the original shape is restored.

Moreover, when a variety of materials are tried to review the shaft, it is known that the resin which is stretched in one axial direction (for example, PET which is extended in one axial direction at a magnification of 2 times or more (preferably 4 times or more) is poly(p-phenylene). Formic acid) resin, when the material is a shaft, the strain range of the elastic deformation in the resin extending in one axial direction is wider than that of the usual material, so the shaft is temporarily suspended due to the impact of the ball. Sexual deformation, the new knowledge of the axis almost returning to its original shape after deformation. According to this new knowledge, the artificial feather for badminton of the present invention has a feather portion and a shaft connected to the feather portion. The cross-sectional shape perpendicular to the plane in which the aforementioned axis extends (longitudinal direction) is rectangular, and the shaft includes a material extending in one axial direction.

In this way, the shaft contains material that extends along an axial direction, so even if When the badminton artificial feather badminton is hit by a racquet, the artificial feather shaft is temporarily deformed by the impact of the tapping, and then returns to the original shape without bending. Moreover, by utilizing the characteristics of the material extending along one axial direction (the elastically deformable strain range is wider than that of the conventional resin material), the cross-sectional shape of the shaft itself can be made rectangular, and the mass of the set shaft is Close to the feathers of natural badminton. Therefore, the quality of the artificial feather for badminton can be made almost the same as that of the natural badminton feather, and the durability of the tapping for the racquet is improved as compared with the prior artificial feather.

The badminton shuttlecock of the present invention includes: a base body having a hemispherical shape; and the artificial feather for badminton connected to the base body. In this way, it is possible to realize the artificial badminton 1 which has the same flying characteristics as the natural badminton using natural feathers and has sufficient durability.

A method of manufacturing an artificial feather for a shuttlecock according to the present invention includes the steps of preparing a shaft and the step of connecting the feather to the shaft. The step of preparing the shaft includes the steps of extending the material forming body in an axial direction (preferably, drawing and stretching) at a magnification of 2 times or more, forming the extending sheet, and cutting the shaft from the extending sheet. In this way, the artificial feather 3 for badminton of the present invention can be manufactured. Moreover, the magnification (stretching ratio) of the axial extension is preferably 4 times or more. Further, as the material constituting the shaft, for example, polyterephthalic acid, PBT (polyterephthalic acid), polynaphthalene dicarboxylic acid, polytrimethylene terephthalate, polyglycolic acid, poly(L-lactic acid), poly ( 3-hydroxybutyrate), poly(3-hydroxybutyrate/polyhydroxyvalerate), poly(ε-caprolactone), polysuccinic acid, polybutylene succinate, polybutylene Butylene glycol adipic acid, polybutyl succinate Glycol ester/lactic acid, polybutylene succinate/carbonate, polybutylene succinate/ethylene terephthalate, polyadipate/ethylene terephthalate, Thermoplastic polyester resin such as dimethyl reanalate/ethylene terephthalate, polybutylene succinate/adipic acid/ethylene terephthalate, ethylene, propylene An α-olefin such as 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene or 4-methyl-1-pentene, or a polymer of two or more kinds thereof. Further, when the stretch ratio is a thermoplastic polyester resin, it is 2 times or more and 10 times or less, preferably 42 times or more and 8 times or less (more preferably about 6 times). Further, when the α-olefin is used alone or in combination of two or more kinds, the stretching ratio may be 15 times or more. Further, in the case of a thermoplastic polyester resin, it is preferred that the glass transition temperature of the material (measured by viscoelastic properties) is ±20 ° C, and after stretching and stretching, and then at a temperature higher than the stretching temperature, It is preferably carried out in an axial direction (for example, a roller extension) at a temperature of from 120 ° C to 230 ° C and at a magnification of from 1.1 to 3 times. Further, the so-called stretch ratio is the cross-sectional area of the sheet before stretching, and is divided by the cross-sectional area of the sheet after the extension.

Further, since the shaft is cut out from the stretched sheet as described above, the manufacturing process is easy and the cost is lower than when the shaft is formed by the injection molding method using a mold or the like.

The method for manufacturing a badminton shuttlecock according to the present invention includes the steps of preparing a hemispherical base body, the method of manufacturing the artificial feather for badminton, the step of manufacturing artificial feathers for badminton, and connecting artificial feathers for badminton to the base The steps of the ontology. In this way, the badminton shuttlecock 1 of the present invention can be manufactured.

When the present invention is used, it is possible to obtain an artificial feather for badminton and a badminton shuttlecock which have high durability while suppressing deterioration of flying characteristics.

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 the description thereof is not repeated.

An embodiment of the shuttlecock of the present invention will be described with reference to Figs. 1 to 3 .

Referring to Figs. 1 to 3, the shuttlecock 1 of the present invention has a hemispherical base body 2, and a plurality of badminton artificial feathers 3 attached to the surface of the base body 2 and having a substantially flat fixing surface portion. The fixing string member 14 for fixing the plurality of artificial feathers 3 and the line 15 for maintaining the three-layer state of the plurality of artificial feathers are mutually fixed. The plurality of artificial feathers 3 (for example, 16) are arranged in an annular shape along the outer peripheral portion of the fixing surface portion in the surface portion for fixing the base body 2. Further, the plurality of artificial feathers 3 are fixed to each other by the string members 14. The plurality of artificial feathers 3 are arranged so as to be apart from the base body 2, and the greater the distance from each other (the larger the inner diameter of the cylindrical body formed by the plurality of artificial feathers 3, the larger the distance from the base body 2).

In the surface portion for fixing the base body 2, a plurality of insertion holes arranged in an annular shape are formed in advance along the outer circumference. The artificial feather 3 shaft 7 (see FIG. 4) is inserted into the insertion hole and integrated with the base body 2. At this time, as shown in Fig. 2, the surface in the width direction of the outer circumference of the artificial feather 3 axis 7 (the long side in the cross section of the shaft 7 in Fig. 2) is from the center point 12 of the surface for fixing the base body 2, as opposed to The radiation directions indicated by the arrows 13 intersect. also, The plurality of axes 7 are the same in the outer circumferential width direction of the cross-sectional shape, and are all the same in the intersecting direction with respect to the radial direction.

The center line 15 serves as a fixing member for maintaining the three-layered state of the plurality of artificial feathers. That is, as described below, the center line 15 is configured to limit the positional relationship of the plurality of artificial feathers 3.

Next, an embodiment of the artificial feather for badminton according to the present invention will be described with reference to Figs. 4 to 11 .

Referring to Figs. 4 to 11 , the artificial feather 3 of the shuttlecock 1 shown in Figs. 1 to 3 is composed of a feather portion 5 and a shaft 7 connected to the feather portion 5. The shaft 7 is constituted by a feather shaft portion 8 that is disposed to protrude from the feather portion 5, and a fixed shaft portion 10 that is connected to the feather portion 5 in a schematic central portion of the feather portion 5. The feather shaft portion 8 and the fixed shaft portion 10 are arranged to extend in the same straight line to constitute a continuous shaft 7. As shown in Figs. 5 and 6, the cross-sectional shape of the shaft 7 in the direction in which the vertical axis 7 extends is rectangular (more specifically, rectangular). Further, as shown in Figs. 5 and 6, in the cross-sectional shape of the shaft 7, the feather portion 5 and the shaft 7 are connected so that the feather portion 5 has a relatively large area of the main surface (the feather shown in Fig. 4) The surface of the portion 5, or the upper surface of the feather portion 5 shown in Fig. 6, intersects (for example, vertically intersects) the surface in the width direction of the outer circumference of the shaft 7. In other words, the surface in the width direction of the shaft 7 is a surface (the two side faces facing each other) extending in the direction intersecting the main surface of the feather portion 5 on the surface of the shaft 7. Further, in the surface of the shaft 7, the other faces of the two widthwise faces are joined (or, in the surface of the shaft 7, the two faces extending in the direction of the main surface of the feather 5), which is called thickness The direction of the direction.

In the cross-sectional shape of the shaft 7, the length W of the outer circumferential width direction surface (see FIG. 5) is gradually reduced from the root portion (the end portion connected to the side of the base body 2) toward the tip end portion. The length T of the outer peripheral thickness direction surface in the cross-sectional shape of the shaft 7 (see Fig. 5) is constant over the entire length of the shaft 7. Moreover, as can be seen from Fig. 7 or Fig. 9, the shaft 7 has a shape that is turned back toward the side when viewed from the side surface side (the side of the cross-sectional shape other than the circumferential width direction). The artificial feather is connected to the base body 2, so that in the shuttlecock 1, the distance between the artificial feathers 3 which are arranged in an annular shape is gradually widened from the base body 2 (the shaft 7 is widened outward), and the shaft 7 is turned upside down. The direction (the convex protruding direction formed by the reverse rotation of the shaft 7) faces the inner peripheral side of the shuttlecock.

Further, the shaft 7 is stretched in an axial direction (roller extension) at a higher temperature (for example, about 170 ° C) at a ratio of about 1.2 times, for example, at a magnification of about 5 times in the vicinity of the glass transition temperature, Further, polyterephthalic acid is formed after heat treatment at a predetermined temperature, and its extending direction is along the extending direction of the shaft 7. Here, the direction in which the shaft 7 extends is defined as follows. In other words, in the side surface viewed from the width direction side of the cross-sectional shape of the shaft 7, the midpoint of the line ab connecting the tip end upper end corner a and the lower end corner b is regarded as a point e. In addition, the curved surface of the upper surface of the shaft 7 in Fig. 9 is considered to be a curve extending from the root side of the shaft 7 (upper curve), and the curved surface of the lower surface of the shaft 7 is considered to be a curve extending on the root side of the shaft 7 (lower portion) curve). Further, the line parallel to the line ab (the line on the root side) is considered to be the root side of the shaft 7. Further, the intersection of the root side line and the upper curve is regarded as a point c, and the intersection of the root side line and the lower curve is regarded as a point d. Moreover, the center (midpoint) of the line cd is regarded as the point f. Moreover, the position of the root side line is from the aforementioned point e and point f The distance between the two is determined by the design length of the shaft 7. In Fig. 9, the root side of the shaft 7 is a wedge-shaped portion having a side surface height as the end portion is closer to the end portion, and the wedge-shaped tip corner portion coincides with the aforementioned point f. Further, the straight line connecting the point e and the point f is the extending direction of the shaft 7.

Further, the direction in which the material constituting the shaft 7 extends is along the extending direction of the shaft 7, and it is preferable that the extending direction is parallel to the extending direction of the shaft 7. Further, the direction in which the material of the shaft 7 extends may be intersected at an angle of ±15 degrees or less with respect to the direction in which the shaft 7 extends. Further, the angle of intersection is preferably 10 degrees or less, and more preferably 5 degrees or less.

Moreover, the design length of the shaft 7 (the line ef length in Fig. 9) may be 76 mm to 79 mm. It is based on the competition specifications of the Japan Badminton Association, which specifies that the length of the tip-to-seat upper surface (to the base body fixing surface) is the length of the feather, which must be 62 mm to 70 mm. For example, the upper surface of the feather tip to the seat is 63 mm to 65 mm, and when the portion where the root of the shaft 7 is inserted into the insertion hole of the base body 2 (buried portion) is 13 mm to 14 mm, as described above, the design length of the shaft 7 is 76 mm. ~79mm.

Further, the curved surface radius of curvature of the upper surface and the lower surface of the shaft 7 shown in Fig. 9 can be 600 mm or more, preferably 800 mm or more. The reason is that when the radius of curvature of the curved surface of the upper surface and the lower surface is too small, in the material extending along one axial direction, the orientation structure of the molecular orientation by the extension is cut at the upper surface and the lower surface, so the shaft 7 The strength is lowered and it is easy to plastically deform. Moreover, the radius of curvature of the upper surface and the radius of curvature of the lower surface may be different values or the same value.

Moreover, the side shape of the shaft 7, as shown in Fig. 9, can be used as From the side view, it is a shape other than anti-warping. For example, as shown in Fig. 10, the shaft 7 may be formed in a straight line without being tilted up when viewed from the side of the shaft 7. In this case, for the point a, the point b, and the point e, the same definition as the point a, the point b, and the point e in the axis 7 shown in Fig. 9 can be used. In addition, the upper surface of the shaft 7 in Fig. 10 is straight, and a straight line (upper straight line) extending on the side of the shaft 7 is considered, and the lower surface of the shaft 7 is straight, and is considered to be a straight line extending on the root side of the shaft 7 (lower part) straight line). Further, a line (root side line) parallel to the aforementioned line ab is considered to be the root side of the shaft 7. Further, the intersection of the root side line and the upper curve is regarded as a point c, and the intersection of the root side line and the lower curve is regarded as a point d. Moreover, the center (midpoint) of the line cd is regarded as the point f. Further, the position of the root side line is determined by the distance between the point e and the point f being the design length of the shaft 7. In Fig. 10, similarly to Fig. 9, the root side of the shaft 7 is a wedge-shaped portion having a smaller side surface height as the end portion is closer to the end portion, and the wedge-shaped tip corner portion coincides with the aforementioned point f. Further, a straight line connecting the point e and the point f (the center line of the shaft 7) is the extending direction of the shaft 7. Further, with respect to such a shaft 7, the direction in which the material constituting the shaft 7 extends is preferably along the extending direction of the aforementioned shaft 7.

The shaft 7 composed of such a material extending in one axial direction has different values in terms of tensile strength, tensile modulus, and the like in different directions. That is, when the axial direction of the shaft 7 is extended along the direction in which the material extends in an axial direction, the tensile strength and the tensile modulus in the direction of the direction in which the vertical axis 7 extends, the tensile strength in the direction in which the shaft 7 is elongated The tensile modulus is, for example, three times or more (in the case of a more detailed description, the tensile modulus is 3 to 7 times and the tensile strength is 5 to 10 times), which is a very large value. Moreover, when the material of the shaft 7 is used to extend polyterephthalic acid along an axial direction, it is measured by its viscoelastic properties. The glass transition temperature obtained is much larger than the usual glass transition temperature of polyphthalic acid (75 ° C), reaching about 130 ° C.

Moreover, whether the shaft 7 is made of an axially extending material can be compared by measuring the characteristic values of tensile modulus, tensile strength and coefficient of linear expansion, etc., and comparing the same material and not extending (no extension material). And judge. For example, regarding the material constituting the shaft 7 to be inspected, when the value satisfying the tensile modulus is 1.5 times or more of the tensile modulus of the non-extension material, and the value of the tensile strength is 1.5 times or more the tensile strength of the non-extension material. Further, when the coefficient of linear expansion is not more than 0.5 times the coefficient of linear expansion of the material to be stretched, it is judged that the material constituting the shaft 7 is a material extending in one axial direction, and the shaft 7 is equivalent to the badminton which constitutes the present invention. Axis 7.

The feather portion 5, as shown in Figs. 6 and 7, is a foam layer 92 and a shaft fixing layer 91 which are disposed by sandwiching the fixed shaft portion 10, and for fixing the foam layer 92 and the shaft fixing layer 91 to each other. The layers 93, 94 are formed next. That is, in the feather portion 5, the foam layer 92 and the shaft fixing layer 91 are laminated by sandwiching the fixed shaft portion 10. Further, in the feather portion 5, the foam layer 92 and the shaft fixing layer 91 are connected to each other, and the fixed shaft portion 10, the foam layer 92, and the shaft fixing layer 91 are joined and fixed, and the back layers 93, 94 are disposed. Further, from the viewpoint of the different viewpoints, in the case of forming the shuttlecock 1 in the feather portion 5, the adhesive layer 92 is laminated on the outer peripheral side foam layer 92. On the above-mentioned adhesive layer 93, the fixed shaft portion 10 is disposed at a substantially central portion of the adhesive layer 93 and the foam layer 92. Moreover, the other side of the back layer 94 is configured to extend from the aforementioned fixed shaft portion 10 to the adhesive layer 93. Further, a shaft fixing layer 91 is disposed on the adhesive layer 94.

As can be seen from Fig. 7, in the artificial feather 3, the shaft 7 is turned toward the side of the foam layer 92 (i.e., the outer peripheral side of the shuttlecock 1). From the different viewpoints, the reverse warping of the shaft 7 protrudes toward the side of the shaft fixing layer 91. In addition, in the seventh drawing, the artificial feather 3 is turned toward the foam layer 92 side in the extending direction of the shaft 7, but may be in a direction intersecting the direction in which the shaft 7 extends (for example, the vertical axis 7 is extended). Further, in the direction (width direction) along the surface of the feather portion 5, the feather portion 5 is turned up toward the side of the foam layer 92 (that is, the anti-warpage state in which the feather portion 5 protrudes toward the side of the shaft fixing layer 91). In this case, the artificial feather 3 may be reversely warped in the direction in which the shaft 7 is extended, and the feather portion 5 may be reversed in the direction intersecting the direction in which the shaft 7 extends, and any of the above-described reverse warping may be performed alone. Such a warpage about the shaft 7 is known from the following manufacturing method. When the shaft 7 is cut out from the sheet material as a material, cutting processing (for example, laser processing or punching processing) is performed, so that the shaft 7 is formed. Anti-warping shape. Further, after the cutting process, heat treatment may be performed to form a reverse warping shape. Further, the feather portion 5 may be subjected to heat treatment to the constituent material of the feather portion 5, or the constituent material of the feather portion 5 may be formed in a reverse-warping state from the beginning, and the reverse warping shape may be realized by a conventionally known method.

Here, as the material constituting the foam layer 92, for example, a resin foam can be used, and more specifically, a polyethylene foam can be used. Further, as the shaft fixing layer 91, a resin foam can also be used. Further, as the shaft fixing layer 91, for example, a film made of a resin or the like, or an arbitrary material such as a non-woven fabric can be used in addition to the polyethylene foam.

Further, as the adhesive layers 93 and 94, for example, a double-sided tape can be used. In the artificial feather 3 shown in Figs. 4 to 7, the foam layer 92 and the shaft fixing layer 91 uses a polyethylene foam. The direction in which the polyethylene foam is extruded is preferably in the direction of the arrow 95 shown in Figs. 4 and 6. In this case, the shaft 7 and the feather portion 5 are then fixed so as to cross the direction in which the polyethylene foam is indicated by the arrow 95, so that the feather portion 5 can be reduced in the direction along the extension direction of the shaft 7. The probability of occurrence.

Next, the configuration of the center line 15 will be specifically described with reference to FIG.

As shown in Fig. 11, the center line 15 is arranged to surround the periphery of the artificial feather 3 axis 7, while being partially in the laminated state of the feathers 5 in the adjacent artificial feathers 3, by adjoining the feathers 5 of the artificial feathers 3 to each other. The opposite direction (that is, through the 5 layers of the plume). In this way, in the portion where the plume 5 is laminated, the center line 15 passes through the stacked feather portions 5, so that it is possible to suppress the order of the plume 5 from being replaced in the use of the shuttlecock 1 (for example, tapping with a racket) The impact of the impact, the order of the plume 5 will be replaced).

The center line 15, as shown in Figs. 1 and 3, is disposed on the circumference such that the plurality of artificial feathers 3 arranged in an annular shape are all fixed to each other. Further, the center line 15 can be arranged, for example, by the operator using a needle or the like, and can be arranged as shown in FIGS. 1 and 3. As a result, it is possible to suppress the stacking order of the feathers 5 and to cause a problem of replacement in the use of the shuttlecock, whereby the shuttlecock 1 having excellent durability can be obtained.

Further, the center line 15 is disposed on the circumference, and the other end portion of the one end portion where the sewing is started and the end portion of the sewing is joined, and the remaining line is cut and removed in the vicinity of the joint. The bonding portion is preferably formed with a protective layer on the surface by applying an adhesive or the like. By forming such a protective layer, when the badminton 1 is tapped by the racket, the joint can be prevented from being untied.

Further, although any material such as cotton or resin can be used for the center line 15, it is preferable to use a polyester thread. In addition, the center line 15 is such that it does not exert an influence on the center of gravity of the shuttlecock 1 and is preferably used as light as possible. For example, a 30 gauge polyester thread can be used. In this case, the center line 15 uses a wire mass of about 0.02 grams. When the quality is to this extent, it will affect the position of the center of gravity of the shuttlecock 1 slightly, but it does not affect the flying characteristics. Further, regarding the arrangement of the center line 15, the distance from the base body 2 can be arbitrarily set.

Next, a method of manufacturing the shuttlecock 1 and the artificial feather 3 for the badminton shown in Figs. 1 to 3 will be described with reference to Figs. 12 to 15 .

First, a method of manufacturing the artificial feather 3 for badminton according to the present invention will be described with reference to Fig. 12. As shown in Fig. 12, in the manufacturing method of the artificial feather 3, the constituent material preparation step (S10) is first carried out. 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 Fig. 6 and Fig. 7, and the subsequent layers 93, 94 are prepared. double-sided tape. Further, the planar shape of the sheet member and the double-sided tape may be any shape as long as it is larger than the size of the feather portion 5 shown in Fig. 4 . It is necessary to form a sheet-like member of the foam layer 92, and for example, a polyethylene foam (sheet-shaped polyethylene foam) and a material having a thickness of 1.0 mm and a basis weight of 24 g/m ^{2 can} be used. Further, it is necessary to form the sheet-like material member of the shaft fixing layer 91, and for example, a polyethylene foam and a material having a thickness of 0.5 mm and a basis weight of 20 g/m ^{2 can} be used. Further, the double-sided tape which becomes the adhesive layers 93 and 94 may have a basis weight of 10 g/m ² .

Moreover, as shown in Fig. 13, the manufacturing step of the shaft 7 is first performed in the base material preparation step (S11). In this step (S11), first prepare to make The material of the shaft 7 (for example, a resin material) is formed into a sheet-shaped raw material molded body. As the material constituting the raw material molded body, although polyterephthalic acid (PET) can be used, other materials (for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octyl) can also be used. An α-olefin such as an alkene, a 1-decene or a 4-methyl-1-pentene or a polymer of two or more kinds thereof. Further, a method of forming a sheet-like raw material molded body can be used, and a well-known method can be used. For example, an extrusion molding method can be used. Further, the thickness of the raw material molded body may be, for example, 2 mm to 5 mm.

Next, the prepared raw material formed body is stretched in one axial direction to form an extended sheet as a base material. The stretching ratio along one axial direction is, for example, 2 times or more, preferably 4 times or more. Further, in the method of extending in one axial direction, although any well-known method can be used, it is also possible to use, for example, a drawing extension method of pulling a sheet between a predetermined interval roller, and sandwiching between two pairs of pinch rollers having different rotational speeds. In the raw material molded body, the so-called roller stretching method of stretching the raw material molded body along one axis (the direction connecting the lines of the two pairs of pinch rollers) is applied by the rotation of the pinch roller. Further, at this time, the raw material molded body may be heated. In this way, an extended sheet extending in one axial direction can be obtained. The obtained stretched sheet is preferably heat treated at a predetermined temperature.

Next, a processing step (S12) is performed. In this step (S12), the shaft 7 is cut out from the extended sheet. Specifically, the shaft 7 may be cut out from the stretched sheet by, for example, a laser processing machine, or any other method may be used. As a result, the shaft 7 constituting the artificial feather 3 can be obtained.

Here, as shown in Fig. 14, when the shaft 7 is cut out from the extending sheet 20, it is preferable to have the upper portion of the shaft 7 (see Fig. 9) and the lower curve (see Fig. 9) having the same radius of curvature. . As a result, as shown in Figure 14, The sheet 20 can be cut out from the stretched sheet 20 in a state where the plurality of shafts 7 are spread without a gap. As a result, the self-extending sheet 20 can be cut out of the shaft 7 without waste. Further, at this time, the direction in which the shaft 7 extends is preferably extended in the direction in which the sheet extends in the direction indicated by the arrow 24 in Fig. 14.

Next, as shown in Fig. 12, a bonding step (S20) is carried out. In this step (S20), the double-sided tape which must be the adhesive layer 93 is adhered to the main surface of the sheet-like member which must be the foam layer 92. Further, on the double-sided tape, the fixed shaft portion 10 of the shaft 7 is disposed. Then, on the surface facing the fixed shaft portion 10, the sheet-like member which is required to be the shaft fixing layer 91 is laminated and placed, and the double-sided tape which must be the adhesive layer 94 is attached to the shaft fixing layer 91. As a result, it is possible to obtain a structure in which the sheet-like member which is required to be the foam layer 92 and the sheet-like member which must be the shaft-fixing layer 91, and the fixing shaft 7 is fixed to the shaft portion 10.

Next, a post-processing step (S30) is performed. Specifically, it is necessary to cut and remove an unnecessary portion of the sheet member that must be the feather portion 5 and to be stacked (that is, it must be a region other than the portion of the feather portion 5). As a result, the artificial feathers 3 shown in Figs. 4 to 7 can be obtained.

Further, here, as shown in Fig. 14, by forming the shaft 7 along the initial state, the artificial feather 3 along the state shown in Fig. 7 can be obtained, but other methods can be used to realize the artificial Feather 3 anti-warping. For example, the artificial feather 3 may be subjected to heat treatment such as applying heat or the like from the side of the foam layer 92, whereby the foam layer 92 and the like are shrunk. As a result, as shown in Fig. 7, the state in which the feather portion 5 is reversed can be achieved.

Next, referring to Fig. 15, the badminton shown in Figs. 1 to 3 will be described. The manufacturing method of 1. As shown in Fig. 15, the preparation step (S100) is first carried out. In this step (S100), the base body 2 (tip member) of the shuttlecock 1 and the shuttlecock 1 constituent member such as the artificial feather 3 are prepared.

As a method of manufacturing the base body 2, any well-known method can be used. For example, it is necessary to use the material of the base body 2, and natural materials such as cork can be used. Further, an artificial resin may be used as the material of the base body 2. When the material of the base body 2 is made of an artificial resin, the base body 2 can be formed using any well-known processing method. For example, first, a block which is a material of the base body 2 is prepared, and is cut into a rough shape. At this time, the height of the hemispherical portion of the tip portion is added for processing. Further, a method of inserting an insertion hole for the artificial feather 3 may be formed by a cutting process. Further, when the above artificial resin is used, for example, an ionic polymer resin foam, EVA (ethylene vinyl acetate copolymer), polyurethane, PVC (polyvinyl chloride), polyethylene, polypropylene or the like can be used. Further, as a method of manufacturing the artificial feather 3, the manufacturing method shown in Fig. 12 described above can be used.

Next, the assembly step (S200) is performed. In the grouping step (S200), seven shafts of the plurality of artificial feathers 3 are inserted and fixed in advance in the insertion hole provided in the surface portion for fixing the base body. Moreover, the plurality of artificial feathers 3 are fixed to each other by a rope member. Further, the thread 15 for maintaining the plume overlap state is sewn so that it becomes the arrangement shown in Fig. 11. In this way, the shuttlecock 1 shown in Figs. 1 to 3 can be manufactured. Further, the fixing members for fixing the plurality of artificial feathers 3 to each other are not limited to the above-described string members, and any members such as an annular member may be used.

Further, as the material of the fixing member, any material such as a resin or a fiber can be used. For example, an aramid fiber or a glass fiber may be used as the string member, and the aramid fiber or the glass fiber may be impregnated with a resin (for example, a thermosetting resin) to harden the resin, whereby the FRP-formed fixing member. In this way, by FRP, the strength or rigidity of the fixing member is improved. Further, as the thermosetting resin, for example, an epoxy resin or a phenol resin can be used. When the thermosetting resin is used for the FRP, the fixing member can be easily used by the thermosetting resin when the heating step or the like is performed in the process for fixing the fixing member to the shaft 7. FRP.

Next, a modification of the artificial feather constituting the embodiment of the shuttlecock of the present invention will be described with reference to Figs. 16 and 17 . Moreover, Fig. 16 corresponds to Fig. 6.

The artificial feather shown in Fig. 16 basically has the same structure as the artificial feather 3 shown in Figs. 4 to 7, but the configuration of the shaft 7 is different. Specifically, the fixed shaft portion 10 of the shaft shown in Fig. 16 is composed of a shaft main body portion 32 made of an extended sheet and an auxiliary member 31 fixed to the shaft main body portion 32. Further, the entire shaft including the fixed shaft portion 10 has a laminated structure composed of two layers of the shaft main body portion 32 and the auxiliary member 31. The auxiliary member 31 may use a material having a lower density than the shaft body portion 32, and for example, a foamed resin sheet may be used. As the foamed resin sheet, for example, a sheet in which polyterephthalic acid is foamed 4 times can be used. The foamed resin sheet may have a specific gravity of, for example, 0.35.

In this way, the increase in the shaft mass can be suppressed as compared with the case where the shaft 7 is formed only by the extending sheet, and the rigidity of the shaft can be improved. As a result, the durability of the artificial feather 3 can be improved. Moreover, the width of the shaft 7 (along the picture in Figure 16) Since the width of the feather portion 5 in the width direction of the feather portion 5 is widened, the air resistance of the shaft 7 is also increased, and the rotational force of the badminton can be increased, and the effect of hitting the ball or the hitting sound can be obtained.

Here, the width of the shaft main body portion 32 in the configuration shown in Fig. 16 may be, for example, 0.2 mm to 0.5 mm. Further, the width of the auxiliary member 31 may be, for example, 0.8 mm to 2.0 mm.

The manufacturing method of the artificial feather 3 including the shaft 7 of the above-described laminated structure is basically the same as the manufacturing method shown in Figs. 12 and 13, but the base material preparation step (S11) shown in Fig. 13 is a part. Different. That is, after the extending sheet 20 extending in one axial direction is obtained, the auxiliary member 21 shown in Fig. 17 is fixed on the surface of the extending sheet 20. In this manner, the auxiliary member 21 is formed by laminating the sheet 22 as a laminate laminated on the surface of the extended sheet 20, and in the processing step (S12), the shaft 7 is cut out, whereby the Fig. 16 can be obtained. The axis of the cross-sectional shape. Further, by using the shaft, a modification of the artificial feather 3 of the present invention and a shuttlecock using the artificial feather 3 can be obtained by the manufacturing methods shown in Figs. 12 and 15.

Further, the laminated structure of the auxiliary member 31 and the shaft main body portion 32 is not limited to the configuration shown in Fig. 16, and a multilayer structure (three-layer structure) in which the auxiliary member 31 is sandwiched by the two shaft main body portions 32 may be employed. Or conversely, the multi-layered construction of the shaft body portion 32 is clamped by the two auxiliary members 31. Further, two or more plural auxiliary members 31 and two or more plural shaft main body portions 32 may be laminated to constitute the shaft 7.

Although there is a part which is partially overlapped with the above embodiment, the characteristic configuration of the present application is as follows.

The artificial feather 3 for badminton of the present invention has a feather portion 5 and a shaft 7 connected to the feather portion 5. As shown in Fig. 5, the cross-sectional shape in the plane in which the vertical axis 7 is extended is rectangular, and the shaft 7 includes a material extending in one axial direction.

In this way, the shaft 7 includes the material extending in one axial direction, so even if the badminton artificial feather 3 is used, when the racket is hit by the racket, the shaft 7 of the artificial feather 3 is temporarily made by the impact of the tapping. After deformation, return to the original shape without bending. Moreover, by utilizing the characteristics of the material extending along one axial direction (the elastically deformable strain range is wider than that of the conventional resin material), the cross-sectional shape of the shaft 7 itself can be made rectangular, and the quality of the shaft 7 can be made. Can be set to be close to the feathers of natural badminton. Therefore, the quality of the artificial feather 3 for badminton can be made substantially the same as that of the natural badminton feather, and the durability against the tapping by the racket can be further improved than the artificial feather of the prior art.

In the aforementioned artificial feather 3 for badminton, the direction in which the shaft 7 is extended (in the direction of the line ef in FIG. 9 or FIG. 10) may also be an arrow extending along an axial direction (arrow of FIG. 14) The direction shown by direction 24). In this case, when the extending direction of the shaft 7 is along the extending direction of the material, the durability against the bending of the shaft 7 can be surely improved. In particular, when the direction in which the shaft 7 is extended is parallel to the direction in which the material extends, the durability of the shaft 7 can be maximized.

Further, here, the direction in which the shaft 7 is extended is a direction along the extending direction, meaning that the angle of intersection of the extending direction of the shaft 7 with the extending direction is less than 15 degrees. Further, it is preferable that the angle of intersection of the extending direction of the shaft 7 and the extending direction is less than 10 degrees, and the angle of intersection is preferably less than 5 degrees.

In the artificial feather 3 for badminton, in the end portion (root portion) on the opposite side to the portion where the feather portion 5 of the shaft 7 is connected, the cross-sectional shape of the shaft 7 may be a rectangle as shown in Fig. 5, or may be used as a rectangle. The width direction surface of the surface extending in the direction of the intersection main surface constitutes the long side of the rectangle, and the surface of the main surface bod 7 has a relatively large area in the feather portion 5 (Fig. 4) Show the face of the feathers 5). Here, the main surface of the feather portion 5 may be defined as the surface of the feather portion 5 on the outer circumferential side (or the inner circumferential side) of the shuttlecock 1 using the shuttlecock artificial feather 3.

In this case, when the shuttlecock 1 is struck by the racquet, the impact from the outer peripheral side is applied to the thickness direction side of the cross section of the shaft 7 (that is, the short side of the cross-sectional shape (rectangular shape)). On the shaft. That is, the impact is applied along the direction of the width direction of the cross-sectional shape of the shaft 7 (for example, the long side in the vicinity of the root of the shaft 7), and therefore, the thickness direction direction (the short side of the rectangle) along the cross-sectional shape of the shaft 7 In contrast to the case where the direction is applied, the shaft 7 can withstand a greater impact value. As a result, the artificial feather 3 for badminton (and the shuttlecock 1 using the artificial feather 3 for badminton) which is excellent in durability can be realized.

The badminton shuttlecock 1 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, it is possible to achieve the deterioration of the flying characteristics, including the same flying characteristics as the natural badminton using natural feathers, and the artificial badminton 1 having sufficient durability.

In the badminton shuttlecock 1 described above, the end portion (root portion) on the opposite side to the portion connected to the feather portion 5 of the artificial feather 3 axis 7 of the shuttlecock, the shaft The cross-sectional shape of 7 may be a rectangle as shown in Fig. 5, or may be a widthwise direction of a surface extending in a direction intersecting the main surface, and constitute a long side of the rectangle, and the main surface is in the surface of the shaft 7 The face of the feather 5 having a relatively large area. Further, the base body 2 and the artificial feather 3 for badminton may be connected so that the surface of the shaft 7 in the width direction is radiated from the center point 12 of the badminton artificial feather 3 to the outer side along the base body 2. (direction shown by arrow 13 in Fig. 2). Further, the surface in the width direction of the shaft 7 includes a direction in which the width direction surface extends in the radial direction, a case where the radiation direction is parallel, and a direction in which the width direction direction is extended and the radiation direction intersect at a certain angle. Here, the angle of intersection between the direction in which the width direction is extended and the direction of radiation is, for example, less than 45 degrees, preferably less than 30 degrees.

In this case, from the outer peripheral side of the shuttlecock 1, when the impact caused by the tapping by the racquet is applied to the artificial feather 3, the shaft 7 receives the impact from the direction along the width direction of the cross-sectional shape of the shaft 7. Therefore, when the shaft 7 receives the impact from the direction along the width direction of the cross-sectional shape of the shaft 7, the shaft 7 can withstand the impact unless it is relatively strong. Therefore, the durability of the shuttlecock 1 can be surely improved.

For example, the base body 2 and the artificial feather 3 for badminton may be connected such that the width direction surface of the cross-sectional shape of the shaft 7 is parallel to the radial direction. In this case, it is possible to increase the direction in which the shaft 7 is parallel to the width direction surface in the cross-sectional shape of the shaft 7, and to withstand the impact of the impact by the tapping of the racket, so that the artificial feather 3 for badminton can be withstood. The impact is the biggest.

In the badminton shuttlecock 1 described above, the base body 2 may be connected to The artificial feather 3 for badminton causes the width direction surface of the shaft 7 to intersect the radial direction. In this case, the width direction of the outer circumference of the shaft 7 is inclined toward the radial direction, so that the stable swirling airflow during the flying of the shuttlecock can be formed around the shaft 7. Further, regarding the axis 7 of the plurality of artificial feathers 3, the direction of intersection of the radial directions is preferably the same direction.

The manufacturing method of the artificial feather 3 for badminton of the present invention has a step of preparing the shaft 7 (constituting material preparation step (S10)), and a step of connecting the feather portion to the shaft 7 (bonding step (S20)). The step (S10) of preparing the shaft 7 includes a step (base material preparation step (S11)) of stretching the raw material forming material in an axial direction at a magnification of 10 times or more to form the extended sheet 20; and a step (processing step ( S12)), the shaft 7 is cut out from the extension sheet 20. In this way, the artificial feather 3 for badminton of the present invention can be manufactured. Moreover, the magnification in the one axial direction is preferably more than 2 times. Further, as the material constituting the shaft, a thermoplastic polyester resin such as polyethylene terephthalate (PET) or ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, or 1 may be used. An a-olefin such as a terpene or a 4-methyl-1-pentene or a polymer of two or more kinds.

Further, since the shaft is cut out from the stretched sheet as described above, the manufacturing process is easier and less expensive than in the case of forming a shaft by using an injection molding method or the like.

The method for manufacturing a badminton shuttlecock according to the present invention includes: a step (preparation step (S100)) for preparing a hemispherical base body; a step (preparation step (S100)), using the above-described badminton artificial feather manufacturing method for manufacturing a shuttlecock Artificial feathers; and steps (assembly steps (S200)), connecting badminton artificial feathers to the base body. In this way, we can make this The badminton shuttlecock 1 of the invention is used.

Next, in order to confirm the effects of the artificial feathers and badminton for badminton of the present invention, the following experiment was conducted.

(Experiment 1)

First, regarding the relationship between the angle of intersection of the extending direction of the extending sheet and the direction in which the shaft 7 extends, and the strength of the shaft, the investigation is as follows. Specifically, the self-extending sheet is cut out from the test piece extending in a direction having a predetermined crossing angle with respect to the extending direction, and the mechanical properties of each test piece (specifically, tensile modulus, maximum stress, maximum strain) are measured. .

(prepared experimental film)

The extended sheet is a PET super-extension sheet (trade name: DUORA) manufactured by Sekisui Chemical Industry Co., Ltd. The thickness of the super-extension sheet was 700 μm. From the aforementioned extended sheet, as shown in Fig. 18, the test piece 41 is cut out, and the test piece 41 has a central axis 42 which intersects with the extending direction of the sheet with respect to the arrow 24 and intersects at an intersection angle θ. The plane dimensions of the test piece were 175 mm in length and 10 mm in width. Moreover, the intersection angle θ has four levels of 0 degrees, 15 degrees, 30 degrees, and 45 degrees, and each intersection angle is prepared for five.

(experimental content)

The experimental machine was subjected to a tensile test using Shimadzu AUTOGRAPH AG-10TB, and the tensile modulus, maximum stress, and maximum strain of each test piece were measured. Moreover, the ambient gas system temperature was measured at 23 ° C and the humidity was 50%. Further, the measurement speed was 10 mm/min, and the distance between the chucks of the fixed test piece was 115 mm.

(result)

For the tensile modulus, for each level of the intersection angle θ, compare five The average elastic modulus of each of the experimental sheets was 9.0 GPa, 7.0 GPa, 4.3 GPa, and 3.2 GPa at various levels of the cross angles of 0, 15, 30, and 45 degrees. Further, for the maximum stress, the maximum stress is 402 MPa, 189 MPa, 112 MPa, and 88 MPa in each of the cross angles of 0 degrees, 15 degrees, 30 degrees, and 45 degrees. Moreover, for the maximum strain, the maximum strain system is also 16.6%, 9.9%, 7.1%, and 5.8% in the cross angles of 0 degrees, 15 degrees, 30 degrees, and 45 degrees.

As a result, it is understood that the smaller the cross angle θ, the larger the tensile modulus, the maximum stress, and the maximum strain.

(Experiment 2)

The relationship between the extending direction of the extended sheet and the bending elastic modulus is investigated as follows.

(prepared experimental film)

The stretched sheet was prepared to have a PET super-extension sheet having the same thickness of 700 μm as the above Experiment 1. The test piece was made into two kinds of test pieces having a rectangular planar shape. Specifically, the two kinds of experimental sheets are experimental pieces (experimental piece B) in which the direction between the rectangular fulcrums is extended along the direction in which the extending sheet extends (experimental piece A) and the direction between the rectangular fulcrums extends vertically. Five experimental pieces were produced for the experimental piece A and the experimental piece B, respectively. Further, the dimensions of the planar shape of each test piece were 20 mm in the direction between the fulcrums and 25 mm in the short side.

(experimental content)

The experimental machine used Shimadzu AUTOGRAPH AG-10TB for bending experiments. Moreover, the bending elastic modulus was measured by this experiment. A schematic diagram for explaining the bending experiment is shown in Figs. 19 and 20. Moreover, the measured atmosphere The system temperature was 23 ° C and the humidity was 50%. Further, the measurement speed was 1 mm/min, and the distance between the support members 52 supporting the test piece was 16 mm.

As shown in Fig. 19, the test piece A was used as the test piece 51, and the test piece 51 was supported by the two support members 52, and the bending test piece 51 was processed from the upper surface of the test piece 51 by the pressing member 53. In this case, the test piece A is subjected to bending processing in the direction of the vertical extension direction. Further, regarding the test piece B, as shown in Fig. 20, a bending test was carried out under the same conditions as those of the experiment piece A shown in Fig. 19. In this case, the test piece B is subjected to bending processing in the direction along the extending direction.

(result)

The flexural modulus of the test piece A, the average of the five test pieces was 13.8 GPa. In addition, the flexural modulus of the test piece B, the average of the five test pieces was 3.3 GPa. As a result, it can be seen that the person who bends in the direction of the orthogonal extension direction has a higher bending modulus than the one that bends in the direction of extension.

(Experiment 3)

A badminton that uses an axis extending at an angle different from the direction in which the extension of the sheet extends is used to make a plurality of types of badminton.

(prepared experimental film)

Using the stretched sheet used in Experiment 1, a plurality of types of shafts having different angles of intersection with the direction in which the shaft was extended were produced. Specifically, the five axes of the intersection angles of 0 degrees, 5 degrees, 10 degrees, 15 degrees, and 30 degrees are produced. Further, in order to accurately measure the influence of the inclination of the shaft, the feather shaft is linear as shown in Fig. 10, and the width of the tip end side is the length (the length W of the width direction surface: that is, the tenth The distance between the ab of the figure is 0.64 mm, and the width of the side side (between cd in Fig. 10) is 2.25 mm. Further, the length T of the thickness direction surface in the axial section is 0.7 mm.

Further, the material of the shaft fixing layer 91 constituting the feather portion 3 of the artificial feather 3 was made of a polyethylene foam having a thickness of 0.5 mm and a basis weight of 20 g/m ² . Further, the material of the foam layer 92 was a polyethylene foam having a thickness of 1.0 mm and a basis weight of 24 g/m ² . Further, the subsequent layers 93, 94 use double-sided tape. The characteristics of the double-sided tape were as follows: a thickness of 10 μm and a basis weight of 10 g/m ² . Further, using such artificial feathers, the shuttlecocks shown in Figs. 1 to 3 are prepared. Moreover, five badmintons are prepared for each of the above-mentioned intersection angles.

(experimental content)

Use the prepared badminton to perform high-profile and killing experiments. Moreover, the so-called ball adjustment system from the center of the badminton court to the rear, vigorously hit the badminton to the back of the opponent's court. Moreover, in the so-called high-profile ball system, the badminton is hit high and the opponent moves to the rear. Here, there is also a DORIBUNN player in the ball adjustment. The so-called DORIBUNN ball is relatively low-pressure hitting the badminton, so that the badminton passes the aggressive ball on the opponent's head. Moreover, the above-mentioned killing system is the most aggressive play for hitting the badminton with an acute angle to the opponent.

(result)

As a result of the above actual experiment, no artificial feather breakage occurred in the shuttlecock in which the cross angle was 0 degree and 5 degree axis. Further, in the shuttlecock in which the cross angle is 10 degrees, the tip end portion of the artificial feather (the portion where the shaft is thin) is broken. Also, in the badminton using a cross angle of 15 degrees, A small number of artificial feathers are damaged. However, in the badminton using the 30 degree axis of intersection, all the artificial feather shafts of the badminton are broken.

In addition, in the badminton using the cross angle of 0 degree and 5 degree axis, the flying characteristics are also closer to the natural badminton.

As a result, from the viewpoint of the durability of the shuttlecock, it is understood that the above-described intersecting angle is preferably 15 degrees or less, and the cross angle is preferably 10 degrees or less. Further, from the viewpoint of good flying characteristics and durability, it is preferable to make the crossing angle 5 degrees or less.

The embodiments and experimental examples disclosed herein are merely illustrative of all points and are not intended to limit the invention. The scope of the present invention is defined by the scope of the invention, and the scope of the invention is to be construed as the scope of the invention.

[Industrial Availability]

The present invention is very suitable for badminton badminton using artificial feathers which can suppress deterioration of flying characteristics and has high durability.

1‧‧‧Badminton

2‧‧‧Base body

3‧‧‧Artificial feathers

5‧‧‧Feather

7‧‧‧Axis

8‧‧‧bone shaft

10‧‧‧Fixed shaft

12‧‧‧ center point

13,24,95‧‧‧ arrows

14‧‧‧Fixed rope components

15‧‧‧ midline

17‧‧‧Axis tip

18‧‧‧ shaft base side end

20‧‧‧Extended sheet

21‧‧‧Auxiliary components

22‧‧‧Laminated sheets

31‧‧‧Auxiliary components

32‧‧‧Axis body

41,51‧‧‧Experimental film

42‧‧‧ center axis

52‧‧‧Support members

53‧‧‧ Pressing members

91‧‧‧Axis fixed layer

92‧‧‧Foam layer

93,94‧‧‧Next layer

Fig. 1 is a side elevational view showing the embodiment of the shuttlecock of the present invention.

Figure 2 is a schematic cross-sectional view taken along line II-II of Figure 1.

Figure 3 is a top plan view of the shuttlecock shown in Figure 1.

Fig. 4 is a plan view showing an embodiment of the artificial feather for badminton of the present invention which constitutes the shuttlecock shown in Figs. 1 to 3;

Fig. 5 is a schematic cross-sectional view taken along line V-V of Fig. 4.

Fig. 6 is a schematic cross-sectional view taken along line VI-VI of Fig. 4.

Fig. 7 is a schematic cross-sectional view taken along line VII-VII of Fig. 4.

Fig. 8 is a perspective view showing the shaft of the artificial feather for badminton shown in Fig. 4.

Figure 9 is a side elevational view of the shaft shown in Figure 8.

Fig. 10 is a side view showing a modification of the shaft shown in Fig. 8.

Fig. 11 is a partial cross-sectional view showing the configuration of a portion in which the center line of the shuttlecock is arranged in Figs. 1 and 2;

Fig. 12 is a flow chart for explaining the artificial feather manufacturing method shown in Figs. 4 to 7 .

Fig. 13 is a flow chart for explaining the shaft forming step included in the constituent material preparation step (S10) shown in Fig. 12.

Fig. 14 is a view for explaining the processing step (S12) shown in Fig. 13.

Fig. 15 is a flow chart for explaining the artificial feather manufacturing method shown in Figs. 1 to 3 .

Fig. 16 is a schematic cross-sectional view showing a first modification of the artificial feather constituting the embodiment of the shuttlecock of the present invention.

Fig. 17 is a schematic cross-sectional view showing a laminated sheet for forming a shaft constituting the artificial feather shown in Fig. 16.

Figure 18 is a schematic view for explaining experimental materials used in the tensile test.

Figure 19 is a schematic diagram for explaining the experimental method of the bending experiment.

Figure 20 is a schematic diagram for explaining the experimental method of the bending experiment.

1‧‧‧Badminton

2‧‧‧Base body

3‧‧‧Artificial feathers

14‧‧‧Fixed rope components

15‧‧‧ midline

Claims (8)

An artificial feather for badminton includes: a feather (5); and a shaft (7) connected to the feather portion (5), and a cross-sectional shape perpendicular to a plane in which the axis (7) extends is rectangular, and the shaft (7) The material comprises a material extending along an axial direction, and the tensile strength and the tensile modulus of the material extending along an axial direction have different values in different directions. The artificial feather for badminton according to claim 1, wherein the shaft (7) extends in a direction along a direction in which the material extends in an axial direction. The artificial feather for badminton according to claim 1 or 2, wherein the shaft (7) is at an end portion opposite to a portion connected to the feather portion (5) of the shaft (7). The cross-sectional shape has a rectangular shape, and a long side of the rectangular shape is formed as a width direction surface of a surface extending in a direction intersecting the main surface, and the main surface is a surface of the shaft (7), and the feather portion (5) The surface with a relatively large area. A badminton shuttlecock comprising: a base body (2) having a hemispherical shape; and an artificial feather (3) for badminton according to claim 1 of the patent scope, connected to the base body (2). The badminton shuttlecock according to the fourth aspect of the invention, wherein the badminton shuttlecock (3) is opposite to a portion of the shaft (7) of the badminton artificial feather (3) that is connected to the feather portion (5) Axis (7) The cross-sectional shape has a rectangular shape, and a long side of the rectangular shape is formed as a width direction surface of a surface extending in a direction intersecting the main surface, and the main surface is a surface of the shaft (7), and the feather portion (5) a surface having a relatively large area, connecting the base body (2) and the artificial feather (3) for badminton such that the surface of the shaft (7) in the width direction is along the base body (2) The center (12) of the surface of the artificial feather (3) for badminton is connected to the outer side in the radial direction. The badminton shuttlecock according to claim 5, wherein the base body (2) is connected to the badminton artificial feather (3) such that the radial direction and the axial direction of the shaft (7) are the same. cross. A manufacturing method for manufacturing an artificial feather for a shuttlecock according to claim 1, comprising: a step (S10) of preparing a shaft (7); and a step (S20) of connecting the feather to the shaft (7) The step (S10) of preparing the shaft (7) includes: a step (S11) of stretching the material forming body in one axial direction by a magnification of 2 times or more to form an extended sheet (20); and the step (S12), The aforementioned extension sheet (20) cuts out the aforementioned shaft (7). A method for manufacturing a badminton badminton comprising: a step of preparing a hemispherical base body; and (S100), using the method for manufacturing an artificial feather for badminton according to claim 7 to manufacture an artificial feather for badminton; Take And step (S200), connecting the artificial feather for badminton to the base body.