JP7085399B2 - Badminton racket - Google Patents

Description

The present invention relates to a badminton racket with a shaft.

In badminton, the player swings the racket and hits the shuttle. For example, as disclosed in Patent Document 1, a badminton racket includes a shaft that connects a grip and an annular frame and extends linearly.

Since the badminton racket demonstrates its performance (control performance and repulsion performance), it is important to adjust the dimension (balance point) from the grip end to the center of gravity in addition to the overall weight. Therefore, it is necessary for a racket maker to prepare rackets of various weights and balance points as a lineup according to the skill level, play style, taste, etc. of the player.

In Patent Document 1, in order to change the weight and balance point of the badminton racket, the cross-sectional shape of the frame and its dimensions are changed.

Japanese Unexamined Patent Publication No. 6-71001

It has been desired that the weight and balance point of the badminton racket can be adjusted at a place different from the shape and cross-sectional structure of the frame, and the degree of freedom of adjustment is further increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a badminton racket capable of increasing the degree of freedom in adjusting the weight and the balance point.

The badminton racket of the present invention is a badminton racket including a frame extending in an annular shape, a grip, and a shaft connecting the frame and the grip, and the shaft excludes a connecting portion with the frame. In the shaft body, both sides in the extending direction are hollow regions, and the other portion is formed including a solid region, and the solid region is formed in a region including a kick point in the bending deformation of the shaft body. It is characterized by that.

According to this configuration, a solid region and a hollow region are formed in the shaft body, so the weight and balance point of the entire racket can be adjusted by changing the length and position of each region in the extending direction of the shaft body. be able to. As a result, the weight and the balance point can be adjusted without changing the structure of the frame or the grip, or in combination with the structural change, and the degree of freedom of the adjustment can be improved. Further, by setting the kick point to the solid region, it is possible to suppress the bending deformation of the shaft at the time of hitting the shuttle, and it is possible to improve the control performance. In addition, the flexural rigidity can be maintained even if the diameter of the shaft is reduced, and the swingability can be improved by reducing the air resistance during swing by reducing the diameter while maintaining the repulsive performance of the shuttle impact. Further, the position of the center of gravity of the shaft itself can be set to the center in the extending direction.

In the present invention, it is preferable that the hollow region is formed in the region of the shaft body embedded in the grip. According to this configuration, in the shaft body, the area embedded in the grip having a relatively low strength requirement can be reduced in weight. Then, by setting the weight of the reduced weight to the solid region in the portion close to the frame, the balance point can be made closer to the tip of the racket.

According to the present invention, since the solid region and the hollow region are formed in the shaft body, the degree of freedom in adjusting the weight and the balance point can be increased.

It is a front view of the racket which concerns on embodiment of this invention. 2A is a cross-sectional view showing an example of a shaft cut along the line AA of FIG. 1, and FIG. 2B is a cross-sectional view showing an example of the shaft and others.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a front view of the badminton racket according to the embodiment. In each of the following figures, some configurations may be omitted for convenience of explanation.

As shown in FIG. 1, the badminton racket (hereinafter referred to as “racket”) 10 includes a grip 11 gripped by a player, a shaft 12 having one end connected to the grip 11 and extending in a linear direction, and a shaft 12. A frame 13 forming an elliptical ring connected to the other end side of the frame 13 is provided. A string 14 is stretched inside the frame 13, and the string 14 forms a ball striking surface 15 on which the shuttle is hit.

Unless otherwise specified in the scope of claims and the description of the present specification, as shown by an arrow in FIG. 1, the side of the longitudinal direction of the racket 10 where the frame 13 is located is the tip end side, and the grip 11 is used. The side to be located is the rear end side. Further, the direction orthogonal to the striking surface 15 is defined as the front and back directions, and the direction orthogonal to the longitudinal direction on the striking surface 15 (that is, on the plane along the striking surface 15) is defined as the left-right direction.

The grip 11 and the shaft 12 are connected to each other in a state where the shaft 12 is inserted (embedded) by a predetermined length into the grip 11 and fixed by adhesion or the like.

The frame 13 is formed of a hollow body having a predetermined wall thickness, and various shapes such as a circular shape, an elliptical shape, and a square shape can be adopted as the cross-sectional shape thereof. The frame 13 is formed by utilizing internal pressure molding due to expansion of a medium such as air. It is exemplified that the inside of the frame 13 is filled with a predetermined foaming material, but the filling of the foaming material may be omitted in a part or all of the frame 13. In the racket 10, the frame 13 and the shaft 12 are connected by a T-shaped joint 16 built therein.

FIG. 2A is a cross-sectional view showing an example of a shaft cut along the line AA of FIG. As shown in FIG. 2A, the shaft 12 is composed of a connecting portion 21 with a frame 13 (see FIG. 1) into which a part of the joint 16 is inserted, and a shaft body 22 forming a region excluding the connecting portion 21. To. In the shaft main body 22, hollow regions 23 and 24 are formed on both sides in the extending direction as a part, and a solid region 25 is formed in the center in the extending direction which is the other portion.

The lengths and positions of the hollow regions 23 and 24 and the solid region 25 in the extending direction of the shaft main body 22 can be variously changed, and FIG. 2A illustrates an example thereof. In FIG. 2A, the hollow region 23 on the grip 11 side is formed in a region embedded in the grip 11 of the shaft main body 22.

By the way, in the racket 10, when the shuttle is hit, the shaft 12 bends and deforms, and the position where the shaft 12 bends most in this deformation is set as the kick point KP, and the shuttle can be hit back by locally bending such a position. .. In FIG. 2A, the solid region 25 is formed in the region including the kick point KP.

It can be exemplified that the shaft 12 is mainly formed of a thermosetting fiber reinforced plastic (FRP: Fiber Reinforced Plastics). The fiber reinforced resin is a heat-curable resin such as epoxy or vinyl ester resin mixed with reinforced fibers and semi-cured. The reinforced fibers include carbon fibers, glass fibers, organic fibers, and ceramic fibers. You can select from the above.

In order to form the hollow regions 23 and 24 and the solid region 25 in the shaft 12, it can be exemplified that a filler is provided in the corresponding portion of the solid region 25 with respect to the cylindrical member. The cylindrical member and the filler may be made of the same material, may be made of different materials, and may have the same specific gravity and rigidity or may be different from each other. Further, the hollow regions 23 and 24 are formed by cutting the central axis position on the end side in the extending direction with respect to the solid round shaft-shaped member, and the non-cut portion is formed as the solid region 25. May be good.

The hollow region 24 on the upper side (frame 13 side) in FIG. 2A can be formed so as to be continuously connected to the space in which the joint 16 is inserted in the connecting portion 21.

According to the above embodiment, since the hollow regions 23, 24 and the solid region 25 are formed in the shaft main body 22, the weight and the position of the center of gravity of the shaft 12 itself are changed depending on their lengths and positions, and eventually the entire racket 10 is formed. The weight and balance point can be adjusted. For example, as shown in FIG. 2B, the balance point can be positioned on the tip side by making the hollow region 23 on the grip 11 side longer and the hollow region 24 on the frame 13 side shorter than in FIG. 2A. Thereby, it can be adjusted in the so-called top heavy direction, and the moment of inertia at the time of swing of the racket 10 can be increased to increase the repulsive force at the time of hitting the shuttle.

By forming the shaft 12 in this way, the weight and the balance point can be adjusted without changing the design of the frame 13 and the grip 11, and the weight and the balance point can be adjusted together with the design change of the frame 13 and the grip 11. Can be done. As a result, the degree of freedom in adjusting the weight and the balance point can be improved, and it is possible to facilitate the correspondence to a wide variety of rackets 10.

By the way, in a badminton racket, a conventional metal or FRP shaft is formed hollow. Here, it can be expected that the air resistance of the shaft at the time of swing is reduced and the swingability is improved by making the shaft solid and having a small diameter while ensuring the strength as compared with the conventional structure. However, in this case, the balance point of the racket as a whole is located on the rear end (grip) side, and the function such as repulsion performance may not be sufficient.

Therefore, as in the above embodiment, by forming the hollow regions 23 and 24 and the solid region 25 in the shaft main body 22, the grip 11 side is set as the hollow region 23, and the weight corresponding to the hollow region 23 is the tip side of the shaft main body 22. Can be distributed to. As a result, the position of the center of gravity of the shaft 12 itself can be adjusted to the tip end side, and by extension, the function such as repulsion performance can be improved with the balance point of the entire racket 10 as the tip end side. Moreover, since the kick point KP is in the solid region 25, it is possible to secure the strength against bending deformation at the time of hitting the shaft. Therefore, it is possible to improve the swinging performance by reducing the diameter of the shaft 12 while keeping the position of the balance point and the strength of the shaft 12 good.

Further, as a conventional method of adjusting the weight and the balance point, there is a method of attaching a sheet made of lead or tungsten to the outer surface of the frame. However, when the sheet is attached, the attached portion will protrude outward, and the air resistance during the swing will change, which will affect the swing speed. In addition, the attached sheet may impair the appearance of the sheet, and the sheet may be unintentionally peeled off due to deterioration over time.

In this respect, in the above embodiment, the weight and the balance point can be adjusted by the internal structure of the shaft 12, and it is possible to avoid the air resistance at the time of swing as in the case of the attached sheet. In addition, the appearance of the racket 10 is not affected, and deterioration over time can be suppressed.

The present invention is not limited to the above embodiment, and can be modified in various ways. In the above embodiment, the size, shape, direction, etc. shown in the attached drawings are not limited to this, and can be appropriately changed within the range in which the effects of the present invention are exhibited. In addition, it can be appropriately modified and implemented as long as it does not deviate from the scope of the object of the present invention.

Further, the lengths and positions of the hollow regions 23 and 24 and the solid region 25 in the extending direction of the shaft main body 22 are not limited to the illustrated configuration example, and can be changed in various ways. For example, the hollow regions 23 and 24 having two locations may be formed at three or more locations to form a plurality of solid regions 25, or any one of the hollow regions 23 and 24 may be omitted. Further, although the hollow regions 23 and 24 and the solid region 25 are formed in order to adjust the weight and the balance point, the solid region 25 is partially formed in the portion where the strength is required in the shaft 12, or what is this? On the contrary, the hollow regions 23 and 24 may be partially formed in the portion where the strength is desired to be weakened (the deformation is desired to be increased).

Further, the connection between the shaft 12 and the frame 13 is not limited to the above-mentioned joint, and other connection structures may be adopted as long as they can be played in the same manner as the racket 10 of the above embodiment.

The present invention relates to a badminton racket that can increase the degree of freedom in adjusting the weight and balance point.

10 racket (badminton racket)
11 Grip 12 Shaft 13 Frame 22 Shaft body 23 Hollow area 24 Hollow area 25 Solid area KP kick point

Claims (3)

A badminton racket including a frame extending in an annular shape, a grip, and a shaft connecting the frame and the grip.
The shaft is formed in the shaft body excluding the connecting portion with the frame, with hollow regions on both sides in the extending direction and other portions including a solid region .
The badminton racket is characterized in that the solid region is formed in a region including a kick point in bending deformation of the shaft body . The badminton racket according to claim 1, wherein the hollow region is formed in a region embedded in the grip in the shaft body. The badminton racket according to claim 1 or 2, wherein the hollow region on the grip side is formed longer than the hollow region on the frame side .

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