Badminton practice ball and badminton racket set

Abstract

To provide a practice ball for a badminton racket that enables a person to practice badminton by himself. [Solution] A practice ball (3) for a badminton racket is suitable for receiving an impact force from a badminton racket (4) and bouncing off a wall surface (5) extending along the height direction (Z). The ball has an elastic body formed in a spherical shape so as to have properties determined by design parameters, which include the material, diameter, weight, density, and restitution coefficient. The material is a foam material, the diameter is within the range of 4.5 cm to 7.5 cm, the weight is within the range of 3 g to 7 g, the density is within the range of 10 kg / m3 to 35 kg / m3, and the restitution coefficient is within the range of 0.45 to 0.65.

Description

[Technical Field]

[0001] The present invention relates to ball game equipment, and more particularly to a practice ball for a badminton racket and a badminton racket set including the practice ball for the badminton racket. [Background technology]

[0002] Ball games require sufficient endurance, explosive power, and technique, so in order to improve their skills, players from beginners to professionals need to practice repeatedly in addition to receiving guidance from a coach.

[0003] As shown in FIG. 1, conventional badminton equipment used in badminton includes a racket 11, a badminton shuttlecock 12 having a head 121 made of cork and a number of feathers 122 attached to the head 121 and extending outward.

[0004] As shown in the figure, when a player swings a racket 11 to hit the head 121 of a badminton shuttlecock 12 so that the shuttlecock 12 hits the wall 2, the racket 11 hits the wall 2, and after bouncing a little, it immediately falls to the ground.

[0005] In other words, with the structure of the Badminton Shuttle 12, badminton practice is not possible without someone to hit the shuttle back to, making it difficult to practice badminton alone. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, the present invention aims to provide a badminton racket practice ball that allows one person to practice badminton alone, and a badminton racket set that includes this badminton racket practice ball. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a practice ball for a badminton racket that is adapted to receive a striking force from the badminton racket, collide with a wall extending along a height direction, and rebound, The elastic body has a spherical shape and is formed to have properties determined by design parameters, the design parameters including material, diameter, weight, density, and coefficient of restitution, the material being a foam material, the diameter being in the range of 4.5 cm to 7.5 cm, the weight being in the range of 3 g to 7 g, and the density being 10 kg / m 3 ~35kg / m 3 and the restitution coefficient is within a range of 0.45 to 0.65.

[0008] The present invention also provides a badminton racket set comprising the above-mentioned badminton racket practice ball and a badminton racket, the badminton racket having a grip and a shaft extending in a predetermined length direction, A badminton racket set is also provided, which includes an annular frame attached to the end of the shaft opposite the grip, and strings stretched across the frame to form an imaginary plane along the length direction and a width direction perpendicular to the length direction as a hitting surface. [Effects of the Invention]

[0009] The practice ball for badminton rackets of the present invention, which has the above-mentioned configuration, has an elastic body formed in a spherical shape, so that when the practice ball hits a wall due to the player's swing, it will bounce back to the player. Furthermore, since the practice ball of the present invention, which is formed in a spherical shape rather than a shuttlecock, can be hit at any angle, the player can repeatedly hit the practice ball of the present invention against the wall, allowing the player to practice badminton by facing the wall even by themselves. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing a conventional badminton implement. [Figure 2] 1 is an explanatory diagram showing a badminton racket set according to the present invention, which includes a badminton racket practice ball and a badminton racket according to the present invention; [Figure 3] 1 is a top view showing a badminton racket set according to the present invention; FIG. [Figure 4] 1 is an explanatory diagram showing the performance of a practice ball for a badminton racket according to the present invention. [Figure 5] 1 is a cross-sectional view showing the moment when a practice ball for a badminton racket of the present invention hits a wall surface. [Figure 6] 1 is a cross-sectional view showing a practice ball for a badminton racket of the present invention bouncing off a wall. DETAILED DESCRIPTION OF THE INVENTION

[0011] In order to more clearly explain the objectives, technical means, and advantages of the embodiments of the present invention, the following will clearly and completely describe the technical means in the embodiments of the present invention in combination with the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. Generally, the components of the embodiments of the present invention depicted and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided below in the accompanying drawings does not constitute any limitation on the protection scope of the present invention, but merely represents selected embodiments of the present invention.

[0012] 2 to 4 show an embodiment of the badminton racket set of the present invention. As shown in the figures, the badminton racket set of the present invention comprises a badminton racket practice ball 3 of the present invention and a badminton racket 4.

[0013] The practice ball 3 for a badminton racket of the present invention includes an elastic body 31. The elastic body 31 is formed in a spherical shape so as to have properties determined by design parameters (control factors).

[0014] In this embodiment, the design parameters include material, diameter, weight, density, and restitution coefficient, where the material is foam, the diameter is in the range of 4.5 cm to 7.5 cm, the weight is in the range of 3 g to 7 g, and the density is 10 kg / m 3 ~35kg / m 3 The coefficient of restitution is in the range of 0.45 to 0.65.

[0015] As a specific example, the elastic body 31 is made of a single piece of polyurethane foam material, and is adapted to receive the impact force from the badminton racket 4, collide with the wall surface 5 extending along the height direction Z, and rebound.

[0016] The diameter of the elastic body 31 is preferably in the range of 5 cm to 7.2 cm. In particular, the range of 5 cm to 7 cm, 5.5 cm to 6.5 cm, or 6.6 cm to 7.2 cm is preferable, for example, 7 cm. Of course, the diameter of the elastic body 31 can be set to 4.6 cm, 4.7 cm, 4.8 cm, 4.9 cm, 5.1 cm, 5.2 cm, 5.3 cm, 5.4 cm, 6 cm, 6.1 cm, 6.2 cm, 6.3 cm, 6.4 cm, 6.7 cm, 6.8 cm, 6.9 cm, 7.1 cm, 7.3 cm, or 7.4 cm.

[0017] The weight of the elastic body 31 is within the range of 3 g to 7 g, but is preferably set to 3 g, 4 g, 5 g, 6 g, or 7 g, and specifically, for example, 5 g is preferable.

[0018] The density of the elastic body 31 is 10 kg / m 3 ~35kg / m 3 Within this range, 15 kg / m 3 ~25kg / m 3 and 19 kg / m 3 ~21 kg / m 3 More preferably, the range is 20 kg / m 3 The resilience coefficient of the elastic body 31 is preferably within the range of 0.45 to 0.65, and more specifically, 0.58, for example.

[0019] By setting the parameters of the elastic body 31 in this way, the first bounce height H1, which is the height of the first bounce after the elastic body 31 free-falls from a drop height H0, which is 100 cm in the height direction Z, and contacts the badminton court ground 6, which is paved with polyvinyl chloride (PVC), can be set to a range of 15 cm to 25 cm. The second bounce height H2, which is the height of the second bounce after the elastic body 31 falls from the first bounce height H1 to the ground 6, can be set to a range of 4 cm to 10 cm. It is preferable to set the design parameters so that the first bounce height H1 is in the range of 18 cm to 22 cm and the second bounce height H2 is in the range of 6.5 cm to 7.5 cm. For example, it is preferable to set the first bounce height H1 to 20 cm and the second bounce height H2 to 7 cm.

[0020] The badminton racket 4 includes a shaft 41 having a grip and extending in a predetermined length direction X, an annular frame 42 attached to the end of the shaft 41 opposite the grip, and strings 43 stretched across the frame 42 to form a ball-striking surface 40 on an imaginary plane along the length direction X and a width direction Y perpendicular to the length direction X. The frame 42 is configured so that its maximum length (maximum frame length L1), which corresponds to the distance between its two ends in the length direction X, is 27 cm or less, and its maximum width (maximum frame width W), which corresponds to the distance between its two ends in the width direction Y, is 22 cm or less. The distance between the two ends of the badminton racket 4 in the length direction X, including the shaft 41 and frame 42 (the racket length), is preferably set to 70 cm or less. It is also preferable that the maximum frame length L1 is 25 cm or less, and the maximum frame width W is 20 cm or less. Furthermore, it is preferable that the racket length L2 is 68 cm or less.

[0021] 2, 3, 5, and 6, the badminton racket 4 configured as described above can be operated by a player to change between a striking state and a non-striking state. In the striking state, the strings 43 come into contact with the practice ball 3, and a striking force is applied to the practice ball 3. In the non-striking state, the strings 43 are not in contact with the practice ball 3.

[0022] In this way, when a player swings the badminton racket 4 and strikes the practice ball 3 with a force of substantially 20.4 N, the elastic body 31 strikes the wall 5 with a force of substantially 10.4 N at a speed of substantially 11.1 m / s. The time during which the elastic body 31 contacts the wall 5 is substantially 0.0089 seconds. The elastic body 31 then bounces away from the wall 5, allowing the player to hit the rebounded elastic body 31, i.e., the practice ball 3. Thus, by using the practice ball 3 of the present invention, it is possible to practice hitting the practice ball 3 with a racket against the wall 5, even without a practice partner. The striking force substantially imparted to the practice ball 3 may be 17 N to 23 N. In this case, the elastic body 31 strikes the wall 5 with a force of substantially 8 N to 12 N at a speed of substantially 8 m / s to 14 m / s. In this case, the time that elastic body 31 contacts wall surface 5 is substantially 0.01 to 0.006 seconds. Generally, in badminton, the ball speed during a smash is 70 to 90 km / h, which is 19.4 to 25 m / s, and the ball speed during a serve is slower. Thus, practice ball 3 according to the present invention can achieve a ball speed during impact that is close to that of a regular badminton shuttlecock.

[0023] In this way, the practice ball for badminton rackets of the present invention has an elastic body 31 formed in a spherical shape, so that when the practice ball 3 hits the wall 5 due to the player's swing, it will bounce back to the player. Furthermore, since the practice ball 3 of the present invention is formed in a spherical shape rather than a shuttlecock, it can be hit at any angle, so the player can also hit the practice ball of the present invention back against the wall, allowing the player to practice badminton by themselves facing the wall.

[0024] Incidentally, if the diameter of the elastic body 31 exceeds 7.5 cm or is less than 4.5 cm, the size will be inappropriate, and in particular, the difference in size from a normal badminton shuttle will be too great, making it unsuitable for getting a feel for actually hitting back a badminton shuttle.

[0025] In addition, the weight of the elastic body 31 exceeds 7 g, or the density is 35 kg / m 3 If the weight of the elastic body 31 is less than 3 g or the density is less than 10 kg / m 3 If it is less than this, the rebound speed tends to be slower, making it less suitable for getting a feel for actually hitting a badminton shuttlecock.

[0026] As described above, the practice ball 3 for badminton rackets of the present invention has a spherical elastic body 31 that simulates the behavior of a badminton shuttlecock, allowing for one-person practice.

[0027] Furthermore, the practice ball 3 for the badminton racket of the present invention is lightweight and can be produced at low cost, so that the practice ball 3 can be provided as a low-cost consumable item for practice.

[0028] The above-described embodiments are illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those skilled in the art may make slight changes or modifications to the above-described embodiments without departing from the spirit and scope of the present invention. Therefore, all changes and modifications made by those skilled in the art without departing from the gist of the present invention should be considered to fall within the scope of protection of the present invention. [Explanation of symbols]

[0029] 3 practice balls 31 Elastic body 4 badminton rackets 40 Ball hitting surface 41 frames 42 Shaft 43 strings 5 Wall 6. Badminton court ground X length direction Y width direction Z height direction L1 Maximum Frame Length L2 Racket length W Maximum frame width H0 Drop height H1 First bounce height H2 Second bounce height

Claims

1. A practice ball for a badminton racket that is adapted to receive a striking force from the badminton racket, collide with a wall extending along a height direction, and rebound, The elastic body has a spherical shape formed to have properties determined by design parameters, the design parameters including material, diameter, weight, density, and coefficient of restitution, the material being a foam material, the diameter being in the range of 4.5 cm to 7.5 cm, the weight being in the range of 3 g to 7 g, and the density being 10 kg / m ３ ~35 kg / m ３ and the restitution coefficient is within a range of 0.45 to 0.

65.

2. 2. The badminton racket practice ball according to claim 1, wherein the elastic body is made of polyurethane foam.

3. 2. The badminton racket practice ball according to claim 1, wherein the diameter of the elastic body is in the range of 5 cm to 7.2 cm.

4. The density of the elastic body is 15 kg / m ３ ~25 kg / m ３ 2. The badminton racket practice ball according to claim 1, wherein the ball has a ball-to-ball ratio of 1:1 or less.

5. The density of the elastic body is 19 kg / m ３ ~21 kg / m ３ 5. The badminton racket practice ball according to claim 4, wherein the ball has a ball-to-ball ratio of 1:1 or less.

6. 2. The practice ball for a badminton racket according to claim 1, wherein the weight of the elastic body is 4 g, 5 g, or 6 g.

7. 2. The practice ball for a badminton racket according to claim 1, wherein the elastic body is configured so that when the impact force is in the range of 17N to 23N, it moves toward the wall surface at a speed in the range of 8m / s to 14m / s, hits the wall surface with a force in the range of 8N to 12N, and the contact time between the elastic body and the wall surface is in the range of 0.01s to 0.006s.

8. 2. The practice ball for a badminton racket according to claim 1, wherein the elastic body is configured so that a first bounce height, which is the height of the first bounce after contacting the ground of a badminton court during a free fall from a height of 100 cm, is within a range of 15 cm to 25 cm, and a second bounce height, which is the height of the second bounce when the elastic body falls from the first bounce height to the ground, is within a range of 4 cm to 10 cm.

9. 9. A badminton racket set comprising the badminton racket practice ball according to any one of claims 1 to 8 and a badminton racket, wherein the badminton racket has a shaft having a grip and extending in a predetermined length direction, an annular frame attached to the end of the shaft opposite the grip, and strings stretched across the frame to form a hitting surface that is an imaginary plane that is aligned along the length direction and a width direction perpendicular to the length direction.

10. the frame of the badminton racket is formed so that a maximum length corresponding to the distance between two ends in the length direction is 27 cm or less, and a maximum width corresponding to the distance between two ends in the width direction is 22 cm or less, 10. The badminton racket set according to claim 9, wherein the distance between two ends of the badminton racket in the length direction including the shaft and the frame is 70 cm or less.

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