JP3047519U - Badminton racket - Google Patents

Abstract

(57) Abstract: A racket having a double kick point is formed by forming a first bending point (4) and a second bending point (5) at a center portion and a tip portion of a shaft portion (3). Provided is a badminton racket that can easily return a hit ball and can respond to a quick shuttlecock movement. A first bent portion having a smaller diameter than other portions is provided at a position closer to a frame portion than a longitudinal center portion of a shaft portion, and a longitudinal center portion of the shaft portion. Since the second bending portion 4 also has the brace, the shaft portion bends with just enough force to return the wrist, and the bounce can be easily returned by the reaction, and the badminton racket can respond quickly to the movement of the shuttlecock. I will provide a.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to rackets used in badminton competitions. In particular, it relates to a badminton racket having two so-called double kick points and having a so-called double kick point.

[0002]

[Prior art]

 In a conventional badminton racket, the thickness of a shaft portion is generally uniform, and one bending point called a kick point exists substantially at the center of the shaft. As a badminton racket having a shaft portion having such a uniform thickness, Japanese Utility Model Publication No. 3-42946, Japanese Utility Model Publication No. 4-40687, and Japanese Patent Application Laid-Open No. H6-190086 have been proposed. As another proposal, it has been proposed to provide a plurality of constricted portions in a shaft portion (Japanese Utility Model Laid-Open No. 5-68561).

[0003]

[Problems to be solved by the invention]

 However, the conventional badminton racket has a problem that it is difficult to increase rigidity and that the shaft portion as a whole hardly bends because there is only one bending point substantially at the center of the shaft. If the shaft is difficult to bend, there is a problem that the response will be delayed when cutting or pushing the shuttlecock flying close to the net. Also, with the recent speed-up of play, the racket frame has been delayed from the quick movement of the shuttlecock, and it has become unable to respond. On the other hand, there is also a strong demand for the development of a racket that is capable of hitting a shuttlecock with greater resilience and higher speed.

An object of the present invention is to provide a badminton racket capable of responding to a rapid movement of a fast rock due to speed-up without delay.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a badminton racket of the present invention is a badminton racket including at least a frame portion, a shaft portion, and a grip portion, the badminton racket being located closer to the frame portion than a longitudinal center portion of the shaft portion. There is a first bent portion having a diameter smaller than that of the other portion, and a second bent portion is also provided at a central portion in a longitudinal direction of the shaft portion.

In the racket, it is preferable that a diameter of the first bent portion is smaller than a diameter of another shaft portion by 0.5% or more. In the racket, the length of the first bent portion is preferably in a range of 10 to 30 mm.

[0007] In the racket, the joint contact portion between the frame portion and the shaft portion is reinforced to prevent torque so that the average diameter of the shaft portion is 50% or more, and the frame portion follows the rotational direction when hitting a ball. Is preferred.

In the racket, it is preferable that the shape of the shaft portion excluding the first bending portion is a tapered shape with a tapered tip or a straight shape with a constant diameter when viewed from the grip portion. Further, in the racket, it is preferable that the shaft portion is made of a reinforced fiber reinforced resin. Further, in the racket, it is preferable that the shaft portion has a hollow pipe shape.

[0009] The badminton racket of the present invention described above is easy to bend, and the bending point can be located closer to the frame than the center of the shaft. Furthermore, kick points can be present at at least two places in the frame portion. Hereinafter, having two kick points is referred to as a double kick point. The connection between the shaft and the frame is reinforced thicker than the thinnest part of the shaft, so that high durability can be maintained.

Next, the kick point will be described. Normally, the kick point is located at the center of the shaft. In the case of a single kick point, it was too late to move the shuttlecock quickly and could not cope. The racket of the present invention has another kick point, a so-called double kick point, and has two or more kick points, making it possible to respond quickly to the movement of the shuttlecock. This position is located closer to the frame than the center of the shaft, preferably near the frame.

[0011]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view of a badminton racket according to one embodiment of the present invention, and FIG. 2 is a sectional view of a shaft portion and a frame portion of a badminton racket according to another embodiment. 1 and 2, reference numeral 1 denotes a badminton racket, which comprises a frame 6, a shaft 3, and a grip 2. In the embodiment of FIG. 1, the diameter of the shaft portion 3 is substantially uniform, and 5 is a first bending point of a portion closer to the frame portion than the center portion of the shaft portion. Reference numeral 4 denotes a second bending point substantially at the center of the shaft portion. When actually hitting a shot with a racket, both the first bending point 5 and the second bending point 4 are formed. That is, the double kick point was confirmed. Reference numeral 7 denotes a string (gut), and reference numeral 8 denotes a reinforcing portion integrally fixing the tip of the shaft portion 3 to the frame portion 6. The reinforcing portion 8 is 50% or more thicker than the average diameter of the shaft portion.

In the embodiment shown in FIG. 2, the outer diameter of the shaft portion near the grip portion 2 is large, and the outer diameter of the shaft portion near the frame portion 6 is relatively larger than that of the shaft portion near the grip portion 2. It has a thin tapered shape. The connection between the shaft 3 and the frame 6 is thicker than the thinnest part of the shaft. Reference numeral 4 denotes a first bending point substantially at the center of the shaft portion. Reference numeral 5 denotes a second bending point in a portion closer to the frame portion than the center portion of the shaft portion. When the player actually hits the shuttlecock with the racket, both the first bending point 5 and the second bending point 4 are formed as described above. That is, the double kick point was confirmed. Reference numeral 7 denotes a string (gut), and reference numeral 8 denotes a reinforcing portion integrally fixing the tip of the shaft portion 3 to the frame portion 6. The reinforcing portion 8 is 50% or more thicker than the average diameter of the shaft portion. When actually hitting the shuttlecock with the racket shown in Fig. 1 and Fig. 2, it was confirmed that the torque was reduced, a high-repulsion hit was possible even in the off-spot, and the sweet spot was expanded.

The shape of the shaft portion (excluding the portion of the first bending point 5) may be substantially uniform in thickness, or may be a tapered shape with a tapered tip as viewed from the grip portion. Further, the diameter of the narrowest portion (the portion corresponding to the bending point 5) of the shaft portion may be a constant straight shape. When the bending point 5 is a straight shape having a constant diameter, the length is preferably in the range of 10 to 30 mm.

Preferably, the shaft portion is made of a reinforced fiber reinforced resin, for example, a carbon fiber reinforced resin, a glass fiber reinforced resin, or a synthetic fiber reinforced resin such as aramid. This is because they are lightweight and have high strength. As the reinforcing fiber reinforced resin, a known method such as a forming method of winding and laminating a prepreg (resin impregnated sheet), a forming method by a filament winding method or the like can be used. Known resins such as thermosetting resins such as polyimide and epoxy, and thermoplastic resins such as nylon and polyester can be used as the resin. The shaft portion 3 is, for example, a hollow pipe having a thickness of about 1 to 2 mm.

As a specific example of the manufacturing method, for example, a normal prepreg laminating method is adopted, in order to form a tapered shape or a thin portion, several upper layers are cut and removed, and this portion is filament-wound. Reinforce. Alternatively, in the filament winding method, it can be formed by setting the winding angle of only this portion, that is, the angle with respect to the shaft axis.

As an example, the length of the shaft portion 3 is 420 mm (the length of the reinforcing portion 8 for fixing the tip of the shaft portion integrally with the frame portion: 25 mm, and the portion inserted into the grip portion 2). : 180 mm. Therefore, the length of the shaft portion 3 which can be determined from the external appearance: 215 mm). The diameter of the shaft portion (straight thickness portion) connected to the grip portion 2 is 7.55 mm, and the diameter of the first bending point 4 (10 mm away from the shaft portion connected to the reinforcing portion 8) The thinnest part was 7.40 mm (about 2% thinner than the thickest part), and the length of the first bending point 4 was 15.0 mm. A prepreg obtained by impregnating a carbon fiber sheet with an epoxy resin was used as a material, and a hollow pipe having a thickness of about 1.5 mm was formed by a lamination method. The frame portion and the grip portion were formed by a known method.

As a result, the obtained racket exhibited good double kick point characteristics, and when the shuttlecock was actually hit, it was possible to respond to the quick movement of the shuttlecock. This was because the shaft flexed just enough to return the wrist, and the ball could be easily returned by the recoil. Of course, the hitting performance and shot feeling were also improved.

[0018]

[Effect of the invention]

 According to the badminton racket of the present invention described above, the following effects can be achieved. (1) Effect of double kick point Improving bending If there are two bending points, for example, the wrist and elbow of the human body, the swing speed will be higher than before, while having the effect of reducing the force compared to the conventional single kick point. Can be exhibited. The control of the shuttlecock becomes easier when the force is reduced. Also, the faster the swing speed, the better the resilience, the sharper the angled shot becomes, and the angle can be made even with smash. Conventionally, as a means for increasing the bending, simply making the shaft thinner has been adopted, but the torque (movement in the rotating direction) has increased, and as a result, the sweet spot has decreased. B. Improved wind breaking performance Although part of the shaft has become thinner, wind breaking performance has been improved and swing speed has been increased. (2) Reinforcing effect of the joint between the shaft and the frame The joint between the shaft and the frame is further strengthened, the torque (movement in the rotating direction) is reduced, and as a result, the sweet spot area is increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of a badminton racket according to an embodiment of the present invention.

FIG. 2 is a sectional view of a shaft portion and a frame portion of the badminton racket according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 badminton racket 2 grip part 3 shaft part 4 second bending point 5 first bending point 6 frame part 7 string (gut) 8 reinforcing part

Claims (5)

[Utility model registration claims] 1. A badminton racket including at least a frame portion, a shaft portion, and a grip portion, wherein the first portion has a diameter smaller than other portions at a position closer to the frame portion than a longitudinal center portion of the shaft portion. A badminton racket having a bent portion and a second bent portion also at a central portion in a longitudinal direction of the shaft portion. 2. The badminton racket according to claim 1, wherein the diameter of the first bent portion is smaller than the diameter of the other shaft portion by 0.5% or more. 3. The length of the first bent portion is 10 to 30 m.
The badminton racket according to claim 1, wherein the range is m. 4. The method according to claim 1, wherein the joint contact portion between the frame portion and the shaft portion is thicker by 50% or more than the average diameter of the shaft portion, and is reinforced to prevent torque so that the frame portion follows the rotation direction when hitting a ball. The badminton racket described. 5. The badminton racket according to claim 1, wherein the shape of the shaft portion excluding the first bent portion is a tapered shape having a tapered tip or a straight shape having a constant diameter when viewed from the grip portion.