TW201524557A - Badminton shuttlecock - Google Patents

Abstract

A badminton shuttlecock (1) that can be manufactured by using simple manufacturing steps and that has high durability is provided with the following: a base body; and a plurality of shuttlecock feathers which are fixed to the base body. The base body has an end part and a reinforcement member (2c) disposed on a portion of the surface of the end part. The reinforcement member (2c) has formed therein a plurality of fixing holes (63) into which a shaft (7) of the shuttlecock feather is inserted and fixed. A first region of the inner circumferential surface of the fixing hole (63) is formed so as to follow a first portion of the surface of the shaft (7) of the shuttlecock feather, and so as to come into contact with the first portion of the surface of the shaft (7) of the shuttlecock feather.

Description

Badminton skirt

The present invention relates to a badminton skirt, and more particularly to a badminton skirt that exhibits high durability.

In the past, as a badminton skirt, it is known that a feather of a waterfowl (natural skirt) is used for feathers, and a feather (manual skirt) artificially manufactured by using a nylon resin or the like is used. Further, in the artificial ball skirt, a feather-shaped one-piece molded product composed of a resin or the like is formed, and a plurality of artificial feathers independent of a natural spherical skirt are used.

In either of the natural spherical skirts and the artificial spherical skirts, the feathers or artificial feathers (hereinafter also referred to as feathers) of the ring-shaped waterfowl are fixed to the hemispherical base body (for example, refer to Japanese Patent Laid-Open No. 56- Bulletin No. 28778).

Japanese Laid-Open Patent Publication No. 56-28778 discloses a ball skirt in which a foamed material layer and a circular plate are connected to a hemispherical cork, and the ball skirt is feathered through a hole formed in the circular plate. The end of the shaft is fixed in a state in which the foamed material layer is buried. In Japanese Laid-Open Patent Publication No. 56-28778, a cork having a cork and a skirt for a skirt has been placed in a molding die through a circular plate passing through a hole, and the resin is foamed in a region between the circular plate and the cork. A layer of foamed material is formed which is fixed to the end of the shaft of the feather for the skirt.

[Prior patent documents]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 56-28778

In the ball skirt disclosed in Japanese Laid-Open Patent Publication No. SHO 56-28778, the shaft of the feather for the skirt is fixed by the circular plate and the foam material layer, so that high durability can be obtained. However, in the above-described process of the ball skirt, it is necessary to arrange the shaft of the ball skirt with the feather through the circular plate, and then arrange the composite element of the disk and the skirt with feathers in the forming mold, and the resin is foamed. The steps have the problem of manpower and expense in their manufacture.

The present invention has been made in order to solve the problems as described above, and an object of the present invention is to provide a badminton skirt which can be manufactured by a simple process and exhibits high durability.

The badminton skirt according to the present invention comprises: a base body; and a plurality of ball skirt feathers fixed to the base body. The base body includes: a front end portion; and a reinforcing member disposed on a portion of a surface of the front end portion. In the reinforcing member, a plurality of fixing holes for inserting and fixing the shaft of the feather for the skirt are formed. The first field of the inner peripheral surface of the fixing hole is formed along the first portion of the surface of the shaft of the feather for the skirt, and is in contact with the first portion of the surface of the shaft of the feather for the skirt.

According to the present invention, it is possible to obtain a durable structure in which the shaft of the skirt is firmly fixed to the base body with a simple structure, and the flying characteristics are stable. Ball skirt for badminton.

1‧‧‧Badminton skirt

2‧‧‧Base body

2a‧‧‧Underground

2b‧‧‧ base of the base

2c‧‧‧ reinforcing members

2d‧‧‧cover film

3‧‧‧Artificial feathers

4‧‧‧Fixed wire members

5‧‧‧Feather

7‧‧‧Axis

7a‧‧‧Part 1

7b‧‧‧Part 2

7c‧‧‧Part 3

7d‧‧‧Part 4

8‧‧‧bone shaft

10‧‧‧Fixed shaft

12‧‧‧Internal components

13‧‧‧External components

14‧‧‧Intermediate components

15‧‧‧ midline

17‧‧‧1st side

18‧‧‧2nd side

63‧‧‧Fixed holes

63a‧‧‧1st field

63b‧‧‧2nd field

63c‧‧‧ field

63d‧‧‧3rd field

63e‧‧‧4th field

Fig. 1 is a schematic side view showing a badminton skirt according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing an artificial feather of a badminton skirt shown in Fig. 1.

Fig. 3 is a schematic enlarged cross-sectional view showing the base body of the badminton skirt shown in Fig. 1.

Fig. 4 is a schematic top view of the badminton skirt shown in Fig. 1 as seen from the direction IV indicated by the arrow in Fig. 3.

Fig. 5 is a schematic cross-sectional view of the line segment V-V of Fig. 1.

Fig. 6 is an enlarged cross-sectional schematic view showing a fixing hole formed in the base body shown in Fig. 5, that is, an enlarged cross-sectional view of a region VI surrounded by a broken line in Fig. 5.

Fig. 7 is a schematic view for explaining a second modification of the badminton skirt shown in Fig. 1.

Fig. 8 is a schematic view for explaining a third modification of the badminton skirt shown in Fig. 1.

Fig. 9 is a schematic view for explaining a fourth modification of the badminton skirt shown in Fig. 1.

Fig. 10 is a schematic view for explaining a fifth modification of the badminton skirt shown in Fig. 1.

Hereinafter, embodiments of the present invention will be described based on the drawings. In addition, In the following drawings, the same reference numerals will be given to the same or corresponding parts, and the description will not be repeated.

The embodiment of the ball skirt of the present invention will be described with reference to Figs. 1 to 6 . state. Referring to Figures 1 to 6, the ball skirt 1 of the present invention mainly comprises: a hemispherical base body 2; an artificial feather 3 for a plurality of ball skirts is connected to a fixing surface portion of the base body 2; The member 4 is for fixing a plurality of artificial feathers 3 to each other; and a center line 15. A plurality of (for example, 15) artificial feathers 3 are attached to the fixing surface portion of the base body 2, and are arranged in an annular shape along the outer circumference of the fixing surface portion. Further, a plurality of artificial feathers 3 are fixed to each other by the fixing linear members 4. The plurality of artificial feathers 3 are arranged to gradually increase in distance from each other away from the base body 2 (ie, the inner diameter of the cylindrical portion formed by the plurality of artificial feathers 3 becomes larger as being away from the base body 2) . In the plurality of artificial feathers 3, a center line 15 for maintaining the laminated state of the artificial feathers 3 is disposed. The center line 15 functions as a stagger preventing member for maintaining the laminated state of the plurality of artificial feathers 3 (predetermining the positional relationship of the plurality of artificial feathers 3).

That is, the center line 15 surrounds the axis 7 of the artificial feather 3, and Further, in a portion where the adjacent artificial feathers 3 are in the laminated state, the feather portions 5 of the adjacent artificial feathers 3 are disposed to face each other (that is, between the stacked feather portions 5). In this way, in the portion where the feathers 5 are stacked, since the center line 15 passes between the stacked feather portions 5, it is possible to suppress the order of the layers of the feathers 5 from being replaced in the use of the skirt 1 (for example, by the impact of the racket) The problem of collision and the replacement of the layers of the plume 5 occurs.

The above-mentioned midline 15 is as shown in Figs. 1 and 4, and will be arranged. The plurality of artificial feathers 3 arranged in a ring shape are disposed on the circumference in such a manner that they are fixed to each other. Further, the center line 15 is, for example, an operator who sews using a needle or the like, whereby the arrangement as shown in Figs. 1 and 4 can be employed. In this way, by suppressing the occurrence of the problem of replacing the layered order of the feathers 5 in the use of the ball skirt 1, it is possible to obtain the ball skirt 1 which exhibits excellent durability.

In addition, the line 15 disposed on the circumference is one of the sewing starting points The end is connected to the other end of the sewing end point, and the excess line portion is cut off and removed in the vicinity of the knotted eye. In the knotted eye, it is preferred to form the protective layer on the surface by applying an adhesive or the like. By forming such a protective layer, when the racquet hits the ball skirt 1, the knotted eye can be prevented from being loosened.

In addition, the center line 15 can use any material such as cotton flower or resin. However, it is preferred to use a polyester thread. Further, in order to avoid affecting the center of gravity of the skirt 1 as much as possible, the center line 15 is preferably as light as possible. For example, as the thread to be used, a cord made of polyester No. 30 can also be used. In this case, the mass of the wire used as the center line 15 is about 0.02 g. If it is this level of quality, although it has a slight influence on the position of the center of gravity of the skirt 1, it can be considered that there is almost no influence on the flying characteristics. Further, regarding the arrangement of the center line 15, the distance from the base body 2 can be arbitrarily set.

Referring to Fig. 2, the artificial feather of the ball skirt 1 shown in Fig. 1 is constructed. The hair 3 has a feather portion 5 and a shaft 7 connected to the feather portion 5. The shaft 7 is composed of a 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 at a substantially central portion of the feather portion 5. The feather shaft portion 8 and the fixed shaft portion 10 are arranged to extend on the same line, and constitute a continuous shaft 7.

As the material of the shaft 7, for example, nylon can be used. Use nylon 12, Nylon 11, nylon 10, nylon 610, nylon 612 and nylon 1010 are preferred. In order to increase the strength of the shaft 7, potassium titanate whiskers, glass fibers, and the like may be added to the nylon. Further, as the material of the shaft 7, polycarbonate, polypropylene, or polyethylene can also be used.

The cross-sectional shape of the shaft 7 of the artificial feather 3 (the cross-sectional shape in the direction perpendicular to the direction in which the shaft 7 extends) may take any shape, and for example, a rectangular shape may be employed as shown in Figs. 5 and 6.

Referring to Fig. 2, the feather portion 5 has a foam layer and a shaft fixing layer disposed to sandwich the fixed shaft portion 10, and an adhesive layer for fixing the foam layer and the shaft fixing layer to each other. That is, in the feather portion 5, the foam layer and the shaft fixing layer are laminated so as to sandwich the shaft at the fixed shaft portion 10. Further, the feather portion 5 extends in the direction along the short side of the shaft 7 shown in Fig. 5. Further, in the feather portion 5, in order to connect the foam layer and the shaft fixing layer to each other, and to fix and fix the shaft portion 10 and the foam layer and the shaft fixing layer, the adhesive layer is disposed. Further, from the viewpoint of the difference, in the feather portion 5, the adhesive layer is laminated on the foam layer located on the outer peripheral side in the case where the ball skirt 1 is formed. On the adhesive layer, the fixed shaft portion is disposed at a substantially central portion of the adhesive layer and the foam layer. Further, the other adhesive layer is disposed to extend from the fixed shaft portion 10 to the adhesive layer. Further, the shaft fixing layer is disposed on the other adhesive layer.

In the artificial feather 3, it is also possible to face the side of the foam layer (that is, on the outer peripheral side of the skirt 1), and the shaft 7 is in a state of being warped. From the viewpoint of the difference, the shaft 7 is in a state of being warped so as to be convex on the side of the shaft fixing layer. Further, the feather portion 5 may be on the foam layer side in a direction in which the extending direction of the shaft 7 intersects (for example, a width direction perpendicular to the extending direction of the shaft 7 and along the surface of the feather portion 5). a state in which the outer side of the ball skirt 1 is warped (that is, the feather portion 5 is on the side of the shaft fixing layer) Become a state of convex warping). In this case, the state in which the artificial feather 3 is warped in the extending direction of the shaft 7 may be simultaneously caused by the state in which the feather portion 5 is warped in the direction in which the feather portion 5 extends in the direction in which the shaft 7 extends, or only one of them may be used. occur. Such warpage can be realized by a conventionally known method such as heat treatment of the constituent material of the shaft 7 or the feather portion 5 or forming a material of the shaft 7 or the feather portion 5 from the state of being warped first.

Here, as a material constituting the foam layer, for example, a tree can be used. A foam of a fat, more specifically, for example, a polyethylene foam. Further, as the shaft fixing layer, a resin foam can be used in the same manner. In addition, as the shaft fixing layer, for example, a foam composed of a resin or the like, or a material such as a non-woven fabric can be used in addition to the polyethylene foam.

Further, as the adhesive layer, for example, a double-sided tape can be used. In labor Feather 3, as the foam layer and the shaft fixing layer, a polyethylene foam can be used, but the extrusion direction of the polyethylene foam is in the direction perpendicular to the extending direction of the second figure and the shaft 7 (in Fig. 2) The left and right direction is preferred. In this case, since the shaft 7 and the feather portion 5 are connected and fixed so as to intersect the extrusion direction of the polyethylene foam constituting the feather portion 5, the direction in which the feather portion 5 extends along the shaft 7 can be reduced. The probability of a bad direction of splitting.

The base body 2 constituting the ball skirt 1 is as shown in Fig. 3 In the following configuration, the base lower layer 2a and the base intermediate layer 2b are laminated, and the outer periphery of the layers is covered by the cover film 2d, and the reinforcing member 2c is laminated to cover the base intermediate layer 2b and the cover film 2d. The base lower layer 2a may also be constructed of a natural material such as cork. The lower layer 2a of the base is known from Fig. 3 and has a hemispherical shape. In a manner of laminating on the lower layer 2a of the base (to be level with the lower layer 2a of the base) The way in which the surface portion of the tan is connected) is to configure the base intermediate layer 2b. The base intermediate layer 2b is, for example, cylindrical. As the material constituting the base intermediate layer 2b, any material may be used, but a material having elasticity is preferable. Further, as the material constituting the base intermediate layer 2b, for example, an artificial material such as a resin material (artificial softwood) can be used, and a foamed resin can be preferably used. However, it is also possible to use natural cork instead of artificial cork in the intermediate layer 2b of the base. From the above, the base lower portion 2a and the base intermediate layer 2b constitute the front end portion of the base body 2.

The reinforcing member 2c is disposed so as to be laminated on the front end portion. Reinforce The shape of the member 2c is, for example, a disk shape. As the material of the reinforcing member 2c, any material such as a resin can be used. The hardness of the reinforcing member 2c may be, for example, higher than the hardness of the material constituting the base intermediate layer 2b. Further, the hardness of the lower layer 2a of the base may be higher than the hardness of the material constituting the intermediate layer 2b of the base. The hardness of the reinforcing member 2c may be higher than the hardness of the lower layer 2a of the base. The base lower layer 2a, the base intermediate layer 2b, and the reinforcing member 2c are connected and fixed to each other by using an adhesive or the like. Further, the cover film 2d is disposed so as to cover the outer periphery of the base lower layer 2a and the base intermediate layer 2b. As the material of the cover film 2d, any material can be used, and for example, synthetic leather can be used.

In the reinforcing member 2c, a plurality of fixing holes 63 for inserting and fixing the shaft 7 of the artificial feather 3 along the outer circumference as shown in Fig. 5 are arranged in an annular shape. The shaft 7 of the artificial feather 3 is inserted and fixed so that the reinforcing member 2c is penetrated through the fixing hole 63 and reaches the inside of the base intermediate layer 2b.

Shaft 7 (feather shaft portion 8) of the line width t ₁ t and at its root (the side closer to the fixed shaft portion 10) has a width of between ₂ difference in width of the distal portion (away from the stationary side shaft portion 10 of) of The width t ₁ is narrower than the width t ₂ . That is, the shaft 7 (the feather shaft portion 8) has a tapered shape. At this time, the diameter of the start of the fixing hole 63 (the diameter before being inserted into the shaft 7) is set to be wider than the width t _{1 of the} shaft 7 and narrower than the width t ₂ .

Since the diameter of the start of the fixing hole 63 is wider than the width t _{1 of the} shaft 7, the shaft 7 can be easily inserted into the fixing hole 63. Further, since the diameter of the initial opening of the fixing hole 63 is narrower than the width t ₂ , the inner circumference of the fixing hole 63 is formed by inserting the shaft 7 of the artificial feather 3 into the fixing hole 63 as shown in Figs. 5 and 6 . The surface (side wall) is locally deformed along the outer peripheral shape of the shaft 7 (i.e., deformed by the outer peripheral surface of the shaft 7 pressing the inner peripheral surface of the fixing hole 63). As a result, the first field 63a and the second field 63b on the inner circumferential surface of the fixing hole 63 are deformed along the first portion 7a and the second portion 7b on the surface of the shaft 7. Then, the first portion 7a of the shaft 7 is in close contact with the first field 63a of the fixing hole 63 (the first portion 7a of the shaft 7 is pressed against the first field 63a), and the shaft 7 is connected to the reinforcing member 2c. fixed. Further, in the same manner, the second portion 7b of the shaft 7 is in close contact with the second field 63b of the fixing hole 63, and the shaft 7 is connected and fixed to the reinforcing member 2c.

Further, the material constituting the reinforcing member 2c and the material constituting the shaft 7 The difference in hardness between the materials is preferable, and the material is preferably selected in such a manner that the hardness of the material constituting the reinforcing member 2c is lower than the hardness of the material constituting the shaft 7. However, depending on the conditions of use, the material may be selected such that the hardness of the material constituting the reinforcing member 2c and the hardness of the material constituting the shaft 7 are higher. Here, the hardness means, for example, JIS K7215 hardness meter D hardness.

As shown in Fig. 5 and Fig. 6, in order to show the fixing holes in a shallow manner The cross-sectional shape of the shaft 63 and the shaft 7 is such that the first field 63a (see Fig. 6) of the fixing hole 63 and the first portion 7a (see Fig. 6) of the shaft 7 are in close contact with each other. Also, solid The second field 63b of the fixed hole 63 is also in a state of being in close contact with the second portion 7b of the shaft 7.

Moreover, the shaft 7 inserted through the fixing hole 63 of the reinforcing member 2c The front end portion is configured to be immersed inside the base intermediate layer 2b. As a result, the shaft 7 is in a state of being connected and fixed to the base intermediate layer 2b and the reinforcing member 2c of the base body 2. Further, in order to make the base intermediate layer 2b continuous with the fixing hole 63, it is preferable to form an insertion hole extending from the uppermost surface of the base intermediate layer 2b (the surface in contact with the reinforcing member 2c) to the inside thereof. Thereby, since the front end portion of the shaft 7 inserted through the fixing hole 63 of the reinforcing member 2c is inserted into the insertion hole inside the base intermediate layer 2b, the shaft 7 is attached (it is assumed that there is no insertion hole inside the base intermediate layer 2b). In contrast, the case is smoothly inserted into the interior of the base intermediate layer 2b.

The shaft 7 of the artificial feather 3 of the artificial resin material is generally inferior to the material to which the softwood or the like is in contact. Therefore, in order to improve the adhesion, the reinforcing member 2c is placed on the base intermediate layer 2b into which the shaft 7 is inserted. The fixing hole 63 of the reinforcing member 2c has a smaller initial diameter than the width t ₂ of the shaft 7, because the inner peripheral side surface of the fixing hole 63 is partially pressed and deformed along the outer peripheral shape of the shaft 7 due to the insertion of the shaft 7, Therefore, the shaft 7 into which the fixing hole 63 of the reinforcing member 2c is inserted is firmly fixed to the reinforcing member 2c.

The fixing hole is pressed into the inside of the base intermediate layer 2b by pressing the shaft 7 The inner peripheral surface of 63 is widened, and since the surface is firmly fixed to the shaft 7, the shaft 7 is firmly fixed to the base intermediate layer 2b. In order to further improve the adhesion between the base intermediate layer 2b and the shaft 7, the base intermediate layer 2b is made of an elastic material, and the insertion hole inside the base intermediate layer 2b is preferably a small diameter to which the shaft 7 is pressed.

As shown above, the fixing hole 63 and the base of the reinforcing member 2c are borrowed The insertion hole inside the intermediate layer 2b, the shaft 7 can be fixed to be in close contact with the base body 2 without using an adhesive. Therefore, the manufacturing manpower and the cost are reduced, and the badminton skirt which exhibits high durability can be provided by a simple process. Further, by improving the adhesion between the base intermediate layer 2b and the shaft 7, deformation of the entire feather can be suppressed. It can provide a badminton skirt with high stability of flying characteristics.

For example, as shown in Figures 3 and 4, the shaft 7 is attached to the base. The uppermost portion of the body 2 extends in an oblique direction, and its extending direction is different from each other between the plurality of support shafts 7. Further, each artificial feather 3 is fixed in a bundle by a position fixing member (fixing linear member 4). Therefore, for example, even if the force is applied to the one shaft 7 in the direction of being separated from the base intermediate layer 2b, since the other shafts 7 bundled with the shaft 7 extend in a direction different from the shaft 7, the shafts are The directional force in which the base intermediate layer 2b is detached is not applied to the other shaft 7. Therefore, in the present embodiment, the shaft 7 can be closely attached to the base body 2 without using an adhesive, and the reliability is high.

In addition, the natural cork is easy to crack when the shaft 7 is inserted here. However, artificial cork is difficult to crack. Therefore, the material constituting the intermediate layer 2b of the base is preferably an artificial material, but a natural material can also be used as the material constituting the intermediate layer 2b of the base.

A method of manufacturing the ball skirt 1 shown in Figs. 1 to 6 will be described.

First, a method of manufacturing the artificial feather 3 constituting the skirt will be described. In the method of manufacturing the artificial feather 3, first, a constituent material preparation step (S10) is carried out. In this step (S10), the material constituting the shaft 7 and the feather portion 5 of the artificial feather 3 (for example, a sheet-like material constituting the foam layer and the shaft fixing layer, and a double-sided tape which can be an adhesive layer) is prepared. Further, the planar shape of the material of the feather portion 5 (for example, 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. 2 . As the sheet-like member which can be a foam layer, for example, a polyethylene foam (a foam of polyethylene and formed into a sheet) can be used, and the thickness is 1.0 mm, and the weight per unit area is 24 g/m ² . material. Moreover, as a sheet-like member which can be a shaft fixing layer, for example, a polyethylene foam, a material having a thickness of 0.5 mm and a weight per unit area of 20 g/m ^{2 can} be used. Moreover, the weight per unit area of the double-sided tape which becomes an adhesive layer can be 10 g/m<^2> .

Further, as the process of the shaft 7 described above, any method can be used. For example, first, a mold preparing step (S11) is carried out. At this step (S11), a mold for forming the shaft 7 by, for example, injection molding or injection compression molding is prepared. Here, as the prepared mold, 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 surface of the mold facing each other.

Next, a forming step (S12) is carried out. In this step (S12), first, The mold prepared as described above is placed in a device (mold setting step) for injecting resin into the inside (recess) of a mold such as an injection molding machine. Then, a resin injection step is performed. That is, the resin is injected into the concave portion inside the mold from the injection port of the resin provided in the mold. As the resin, a thermoplastic resin such as nylon can be used. As a result, the shaft is formed inside the mold. In this way, the forming step (S12) is carried out. Then, 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. In this step (S20), it will be The double-sided tape which becomes an adhesive layer adheres to the main surface of the sheet-like member which can become a foam layer. Then, the fixed shaft portion 10 of the shaft 7 is disposed on the double-sided tape Above. Further, from this, a sheet-like member which can be a shaft fixing layer, which is adhered to another double-sided tape which can be an adhesive layer, is laminated and adhered to a surface facing the fixed shaft portion 10. As a result, a structure in which the sheet-like member which can be a foam layer and the sheet-like member which can be a shaft-fixing layer are sandwiched and fixed to the fixed shaft portion 10 of the shaft 7 can be obtained.

Next, a post-processing step (S30) is performed. Specifically, the cut is The unnecessary portion (that is, the region other than the portion of the feather portion 5) that can be placed in the layered portion of the feather portion 5 can be obtained. As a result, the artificial feather 3 as shown in Fig. 2 can be obtained. Then, the artificial feather 3 is subjected to heat treatment such as heating from the side of the foam layer to shrink the foam layer or the like. As a result, the state in which the shaft 7 and the feather portion 5 are warped can be achieved. Further, in order to achieve the state in which the shaft 7 and the feather portion 5 are warped, other methods may be used. For example, a method of using the shaft 7 of the warped shape from the beginning may also be employed.

Next, a method of manufacturing the base body 2 constituting the ball skirt will be described. In the method of manufacturing the base body 2, a constituent material preparation step (S15) is performed. In this step (S15), the base lower layer 2a, the base intermediate layer 2b, the reinforcing member 2c, and the cover film 2d constituting the base body 2 are separately prepared.

Next, an assembly step (S25) is performed. In this step (S25), already The state in which the above-described plate-like base lower layer 2a and the base intermediate layer 2b are laminated is fixed to each other by an adhesive or the like. The fixed base intermediate layer 2b is cut into a cylindrical shape, and the base lower layer 2a is ground into a hemispherical shape.

Next, to cover the base lower layer 2a and the base intermediate layer 2b The cover film 2d is formed in a circumferential manner. The cover film 2d overflowed (projected) on the upper side of the base intermediate layer 2b (the side on which the reinforcing member 2c is laminated) is cut. Then, the flakes The reinforcing member 2c is cut into a disk shape. Here, the reinforcing member 2c is cut into a disk shape having a diameter having a circular diameter of the base intermediate layer 2b in which the reinforcing member 2c is laminated and a sum of twice the thickness of the cover film 2d in plan view. Then, the cut reinforcing member 2c is laminated to contact the upper surfaces of the base intermediate layer 2b and the cover film 2d by using an adhesive or the like. Further, as a method of connecting the base lower layer 2a, the base intermediate layer 2b, and the reinforcing member 2c, any other method may be used.

As a method of forming the cover film 2d, any conventionally known one can be used. The method of meaning. In this way, the base body 2 can be obtained. Further, as the material of the lower layer 2a of the base, natural cork can be used. Further, in the case of using a synthetic resin as the material of the base intermediate layer 2b, for example, an ionic polymer resin foam, or EVA (ethylene/vinyl acetate copolymer), polyurethane, PVC (polyvinyl chloride), or poly can be used. Ethylene, polypropylene, etc. Further, as the material of the reinforcing member 2c, for example, polyethylene (PE), polypropylene (PP), nylon, polyethylene terephthalate (PET), ABS resin, or a foam of these resins (for example, poly Acrylic foam, etc.). Moreover, the thickness of the reinforcing member 2c can be, for example, 0.5 mm or more and 2 mm or less, and more preferably 0.7 mm or more and 1.5 mm or less.

Next, the manufacturer of the ball skirt 1 shown in Figs. 1 to 6 will be described. law. In the method of manufacturing the ball skirt 1, first, a preparation step (S100) is carried out. In this preparation step (S100), the base member 2 of the skirt 1 and the constituent members of the ball skirt 1 such as the above-described artificial feather 3 are prepared.

Next, an assembly step (S200) is performed. In the assembly step (S200), the root portion of the shaft 7 of the plurality of artificial feathers 3 described above is inserted into the fixing hole 63 of the reinforcing member 2c including the fixing surface portion of the base body 2. At this time, the width of the initial fixing hole 63 is set to be narrower than the width t _{2 of the} shaft 7 (refer to FIG. 2), and the material constituting the shaft 7 is formed by the material constituting the reinforcing member 2c in advance. The material is selected in such a manner that the hardness differs (for example, the hardness of the material constituting the reinforcing member 2c is lower than the hardness of the material constituting the shaft 7), and the inside of the hole 63 is fixed by inserting the shaft 7 into the fixing hole 63. The circumferential surface is locally deformed (the fixing hole 63 is partially enlarged along the shape of the shaft 7). As a result, a part of the surface of the shaft 7 is fixed in a state of being in close contact with the reinforcing member 2c.

Moreover, at this time, in the base intermediate layer 2b of the base body 2, It is preferable to form the insertion hole in such a manner as to be continuous with the fixing hole 63 of the reinforcing member 2c in advance. In this manner, the insertion hole is enlarged by the shaft 7 by inserting the root of the shaft 7 passing through the fixing hole 63 of the reinforcing member 2c into the insertion hole of the base intermediate layer 2b. As a result, since the root portion of the shaft 7 is in a state of being in close contact with the inner peripheral surface of the insertion hole of the base intermediate layer 2b, the shaft 7 can be fixed to the base intermediate layer 2b.

According to the above, as described above, the shaft 7 is fixed to the base body 2 by a simple process without using an adhesive.

Further, the plurality of artificial feathers 3 are fixed to each other by the fixing linear member 4. Further, a center line 15 for maintaining the overlapping state of the feathers 5 is provided in the feather portion 5. In this way, the ball skirt 1 shown in Figs. 1 to 6 can be manufactured. Further, the fixing member that fixes the plurality of artificial feathers 3 to each other is not limited to the linear member as described above, and any member such as an annular member may be used.

Further, as the material of the fixing member, any material such as resin or fiber can be used. For example, as the linear member, a polyamide resin or a glass fiber may be used, and a resin (for example, a thermosetting resin) may be immersed in the amide fiber or the glass fiber, and a fixing member which is FRP-cured by curing the resin may be used. By FRP in this way can increase the strength or rigidity of the fixing member. 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 in this manner, and the heating step for fixing the fixing member and the shaft 7 is performed, the FRP of the fixing member can be easily performed by the thermosetting resin.

In addition, in the above ball skirt 1, according to the axis of artificial feather 3 7 The case where the cross-sectional shape is a rectangle is described, but the cross-sectional shape of the shaft 7 may be any shape other than the above-described rectangle. For example, as shown in Fig. 7, the shaft 7 may have a cross section of an I shape.

Referring to Fig. 7, the ball skirt 1 shown in Figs. 1 to 6 will be described. The first modification. In addition, Fig. 7 corresponds to Fig. 6 and shows a connecting portion between the shaft of the artificial feather 3 and the fixing hole 63 of the reinforcing member 2c which constitute the fourth modification of the ball skirt 1 shown in Figs. 1 to 6 . The shaft 7 shown in Fig. 7 constitutes the shaft 7 of the artificial feather of the first modification of the ball skirt 1 shown in Figs. 1 to 6 . The skirt having the shaft 7 shown in Fig. 7 basically has the same structure as the skirt 1 shown in Figs. 1 to 6, but the shape of the shaft 7 of the artificial feather 3 and the first to sixth The skirts shown in the picture are different.

The shaft 7 of Fig. 7 includes a rectangular inner member 12 and a rectangular outer member 13 which are arranged to be arranged in a cross-sectional shape thereof, and an intermediate member 14 which is disposed to connect between the inner member 12 and the outer member 13. Here, the angle of the section of the shaft 7 in the direction perpendicular to the extending direction is processed into a rounded corner. Further, the thickness of the inner member 12 and the outer member 13 at both end portions in the respective extending directions is thinner than the thickness at the central portion. Using the shaft 7 of such a cross-sectional shape, the outer diameter of the starting hole 63 is also made larger than the maximum width of the shaft 7 in the cross section. As shown in Fig. 7, the first portion 7a and the second portion 7b of the shaft 7 partially press and deform the inner peripheral surface of the fixing hole 63, and are respectively the first inner peripheral surface of the fixing hole. The field 63a and the second field 63b are fixed in contact with each other. As a result, the same effects as the ball skirts shown in Figs. 1 to 6 can be obtained.

Regarding the skirt of the artificial feather 3 using the shaft 7 having the sectional shape of Fig. 7, the shaft of the artificial feather 3 can be similar to the skirt of the artificial feather 3 using the shaft 7 having the sectional shape of Fig. 6 It is fixed to the reinforcing member 2c. In other words, the first field 63a of the fixing hole 63 is deformed so as to be in contact with the first portion 7a of the shaft 7, and is in close contact with the first portion 7a. In the same manner, the second field 63b of the fixing hole 63 is deformed so as to be in contact with the second portion 7b of the shaft 7, and is in close contact with the second portion 7b of the shaft 7. As a result, the shaft 7 of the artificial feather 3 can be connected and fixed to the reinforcing member 2c of the base body 2.

Further, the shaft 7 shown in Fig. 7 has a concave portion extending in the extending direction of the shaft 7 on the first side surface 17 of the intermediate member 14 and the second side surface 18 on the side opposite to the first side surface 17. This recess is composed of 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. This concave portion may be formed by at least a part of the shaft of the extending direction of the shaft 7. Further, the recess is continuously formed from the vicinity of the front end of the shaft 7 or the front end to the vicinity of the rear end in the extending direction of the shaft 7.

A third modification of the ball skirt 1 shown in Figs. 1 to 6 will be described with reference to Fig. 8. Further, Fig. 8 corresponds to Fig. 6. The ball skirt shown in Fig. 8 basically has the same structure as the ball skirt 1 shown in Figs. 1 to 6 , but the cross-sectional shape of the shaft 7 constituting the artificial feather 3 and the first to sixth figures are The ball skirt 1 is different. That is, the cross-sectional shape of the shaft 7 of the artificial feather 3 shown in Fig. 8 The shape is a shape in which one of the squares is removed, and the intermediate member 14 is disposed at an end portion that connects the opposite ends of the inner member 12 and the outer member 13. In the shaft 7 having such a cross-sectional shape, the first field 63a of the fixing hole 63 is also deformed so as to be in close contact with the first portion 7a of the shaft 7, and is in close contact with the first portion 7a. In the same manner, the second field 63b of the fixing hole 63 is deformed so as to be in contact with the second portion 7b of the shaft 7, and is in close contact with the second portion 7b of the shaft 7. As a result, the shaft 7 of the artificial feather 3 can be connected and fixed to the reinforcing member 2c of the base body 2.

Referring to Fig. 9, the ball skirt 1 shown in Figs. 1 to 6 will be described. Fourth modification. In addition, the ninth figure corresponds to the sixth figure. The ball skirt shown in Fig. 9 basically has the same structure as the ball skirt 1 shown in Figs. 1 to 6 , but the cross-sectional shape of the shaft 7 constituting the artificial feather 3 and the first to sixth figures are The ball skirt 1 is different. That is, as shown in Fig. 9, the cross-sectional shape of the shaft 7 of the artificial feather 3 is a cross shape. In the shaft 7 having such a cross-sectional shape, the first portion 7a, the second portion 7b, the third portion 7c, and the fourth portion 7d which protrude outward from the central axis of the shaft 7 become the first field 63a of the fixing hole 63, The second field 63b, the third field 63d, and the fourth field 63e are in close contact with each other. Further, the first field 63a to the fourth field 63e of the fixing hole 63 are pressed by the first portion 7a to the fourth portion 7d of the shaft 7, and the inner circumferential surface of the fixing hole 63 of the reinforcing member 2c is deformed, thereby forming . In this manner, the four position shafts 7 are in close contact with and fixed to the inner circumferential surface of the fixing hole 63, whereby the shaft 7 can be surely fixed to the reinforcing member 2c.

Referring to Fig. 10, the ball skirt shown in Figs. 1 to 6 will be described. In the fifth modification, the tenth figure corresponds to the sixth figure. The ball skirt shown in Fig. 10 basically has the same structure as the ball skirt 1 shown in Figs. 1 to 6 but The cross-sectional shape of the shaft 7 constituting the artificial feather 3 is different from the spherical skirt 1 shown in Figs. 1 to 6 . In other words, as shown in Fig. 10, the cross-sectional shape of the shaft 7 constituting the artificial feather 3 in the fifth modification of the skirt is a rhombic shape, and the first portion 7a located at one end portion in the long axis direction of the rhombus is located and located. The second portion 7b of the other end portion is in a state of being in close contact with the first field 63a and the second field 63b on the inner circumferential surface of the fixing hole 63 of the reinforcing member 2c. The first field 63a and the second field 63b are formed by bending the inner peripheral surface of the fixing hole 63 by the first portion 7a and the second portion 7b of the shaft 7. As a result, the shaft 7 can be fixed to the reinforcing member 2c in which the fixing hole 63 has been formed, similarly to the ball skirt of the present invention shown in Figs. 1 to 6 .

Here, the components which are partially overlapped with the above-described embodiment are listed, and the characteristic configuration of the present invention is exemplified.

The badminton skirt 1 according to the present invention includes a base body 2, and a plurality of feathers for the ball skirt (artificial feathers 3) fixed to the base body 2. The base body 2 includes a front end portion (the base lower layer 2a and the base intermediate layer 2b), and a reinforcing member 2c disposed on a part of the surface of the front end portion. In the reinforcing member 2c, a plurality of fixing holes 63 for inserting and fixing the shaft 7 of the feather for the skirt are formed. The first field 63a of the inner circumferential surface of the fixing hole 63 is formed along the first portion 7a of the surface of the shaft 7 of the feather for the skirt, and the first surface of the shaft 7 of the feather for the skirt Part 7a is in contact.

In this manner, the reinforcing member 2c can be fixed to the shaft 7 for the skirt feather by the first portion 7a of the surface of the shaft 7 for the feather skirt contacting the inner peripheral surface of the fixing hole 63 of the reinforcing member 2c. The structure in which the shaft 7 is brought into contact with the inner peripheral surface of the fixing hole 63 of the reinforcing member 2c in this manner is, for example, a reinforcing member is previously made. The initial size of the fixing hole 63 of 2c is smaller than the sectional shape of the shaft 7, and the fixing hole 63 can be enlarged by pressing the shaft 7 of the ball skirt into the fixing hole 63 (to be along the axis 7) The simple steps of the expansion and deformation of the shape are realized. Therefore, it is not necessary to arrange the resin which is the shaft 7 or the front end portion in the inside of the mold, and to fix the front end portion to the shaft by foaming the resin. Therefore, a badminton skirt for fixing the ball skirt to the reinforcing member 2c (high durability) can be obtained by a simple process. Further, the strength (for example, hardness) of the reinforcing member 2c is preferably higher than the strength (for example, hardness) of the front end portion (the base lower layer 2a and the base intermediate layer 2b). For example, when the front end portion is made of cork or the like, and the shaft 7 is fixed to the reinforcing member 2c as compared with the case where the front end portion is fixed to the shaft 7 for the skirt feather, the fixing portion of the shaft 7 can be attached to the base. The strength of the body 2 remains high. As a result, the durability of the badminton skirt can be further improved.

In the badminton skirt, the end portion (root portion) of the feather shaft 7 of the ball skirt may be attached to the inside of the end portion of the base body 2 through the fixing hole 63 of the reinforcing member 2c (the base intermediate layer 2b) The state of the internal) is fixed. In this case, not only the reinforcing member 2c but also the shaft 7 for the skirt feather can be fixed to the front end portion. Therefore, the durability of the skirt 1 can be further improved.

In the badminton skirt, the second field 63b of the inner circumferential surface of the fixing hole 63 may be formed via the center of the shaft 7 so as to face the second portion 7b facing the first portion 7a of the surface of the shaft 7. The second field 63b of the inner circumferential surface of the fixing hole 63 may be in contact with the second portion 7b of the surface of the shaft 7.

In this case, since the second field 63b of the inner circumferential surface of the fixing hole 63 is in contact with and fixed to the second portion 7b of the surface of the shaft 7, the shaft 7 can be more firmly fixed to the reinforcing member 2c.

In the badminton skirt, the cross-sectional shape of the shaft 7 in the direction in which the direction in which the shaft 7 extends may have a long axis as shown in Fig. 6 or Fig. 10. The first portion 7a and the second portion 7b of the surface of the shaft 7 may be formed such that the cross-sectional shape of the shaft 7 is located at both end portions in the direction along the major axis. In this case, at both end portions of the long axis of the cross-sectional shape of the shaft 7, since the surface of the shaft 7 is in contact with and fixed to the inner peripheral surface of the fixing hole 63, the inner peripheral surface of the fixing hole 63 is taken along the axis 7 The direction of the long axis is fixed to sandwich the shaft 7. As a result, the shaft 7 can be more stably fixed to the fixing hole 63 of the reinforcing member 2c.

In the badminton skirt, the hardness of the reinforcing member 2c may be lower than the hardness of the shaft 7. In this case, a fixing hole (starting fixing hole) smaller than the width of the shaft 7 is formed in advance on the reinforcing member 2c, and the fixing hole 63 can be obtained by pressing the skirt 7 into the initial fixing hole with the feather shaft 7. The inner peripheral surface is deformed along the axis 7. As a result, it is possible to fix the state in which the shaft surface is in close contact with the inner circumferential surface of the fixing hole 63.

In the badminton skirt, the front end portion has a first member (base lower layer 2a) and a second member (base intermediate layer 2b). It is also possible that the first member (the lower layer 2a of the base) is composed of a hemispherical natural cork. Alternatively, the second member (base intermediate layer 2b) may be connected to the first member and formed of an elastic body. The second member may be, for example, a block made of a synthetic resin or a foam which foams a synthetic resin.

Further, the badminton ball skirt may further include a position fixing member (fixing linear member 4) for fixing the plurality of ball skirts with the feather shafts 7 to each other. In this case, when the ball skirt 1 is used, since the problem of the relative positional deviation of the shaft 7 of the feather for the skirt can be suppressed, the durability of the skirt can be further improved. In this case, since the shaft 7 of the ball skirt 1 is hard to be detached from the base material, and the rigidity of the entire skirt 1 is improved, deformation can be suppressed, so that the stability of the flying characteristics can be further improved.

In the badminton skirt, the ball skirt (artificial feather 3) may also include the shaft 7 and the feather portion 5. The feather 5 is connected to the shaft 7. The feather portion 5 may have a foam layer and a shaft fixing layer joined to the foam layer via the shaft 7. Alternatively, the foam layer and the shaft fixing layer have the same planar shape. In this case, the ball skirt 1 using the artificial feather 3 can be realized.

It is to be understood that the embodiments disclosed herein are illustrative of all matters and are not intended to be limiting. The scope of the present invention is defined by the scope of the invention, and is intended to

[Industrial Applicability]

The present invention is advantageously applied to a badminton skirt that uses artificial feathers in particular.

2c‧‧‧ reinforcing members

7‧‧‧Axis

63‧‧‧Fixed holes

Claims (6)

A badminton ball skirt comprising: a base body; and a plurality of ball skirt feathers fixed to the base body; the base system comprises: a front end portion; and a reinforcing member disposed on a portion of the surface of the front end portion Forming, in the reinforcing member, a plurality of fixing holes for inserting and fixing the shaft of the feather for the skirt; the first field of the inner peripheral surface of the fixing hole is a surface of the shaft along the feather of the skirt The first portion is formed in a manner that is in contact with the first portion of the surface of the shaft of the skirt for feathers. The badminton skirt according to claim 1, wherein the inner peripheral surface of the fixing hole is formed so as to pass through the center of the shaft and along the second portion facing the first portion of the surface of the shaft. The second field; the second field of the inner peripheral surface of the fixing hole is in contact with the second portion of the surface of the shaft. The badminton skirt according to claim 2, wherein a cross-sectional shape of the shaft in a direction intersecting the extending direction of the shaft has a long axis; the first portion and the second portion of the surface of the shaft The cross-sectional shape of the shaft is located at both ends in the direction along the long axis. The badminton skirt of any one of claims 1 to 3, wherein the reinforcing member has a hardness lower than that of the shaft. A badminton skirt according to any one of claims 1 to 3, The front end portion has a first member formed of a hemispherical natural cork, and a second member connected to the first member and composed of an elastic body. The badminton skirt according to any one of claims 1 to 3, further comprising a position fixing member for fixing the plurality of ball skirts to the shaft of the feather.