WO2022039443A1

WO2022039443A1 - Structure of tennis practice frame

Info

Publication number: WO2022039443A1
Application number: PCT/KR2021/010757
Authority: WO
Inventors: 강일석; 강찬
Original assignee: 강일석
Priority date: 2020-08-19
Filing date: 2021-08-12
Publication date: 2022-02-24
Also published as: US20230149790A1

Abstract

The present invention relates to a giyeok-shaped tennis practice frame provided to be much taller than the height of a person from the ground or a wall-attachable tennis practice frame provided on a bracket (101) provided at a certain point of a house or a building, which is much higher than the height of the person. In the formation of the tennis practice frame, the characteristics of connection strings (200, 210) that suspend a ball are most important apart from a basic frame. A technique for a tennis practice frame, in which deep concerns about the characteristics of ball connection strings pervade, has not been disclosed yet. In addition, for ball connection strings to normally function, a weight may be mostly mandatory for the ball connection strings. The tennis practice frame according to the present invention is a practice frame with which a trainee performs tennis practice while repetitively hitting a ball falling in front of the trainee along a circumferential curve by means of gravity after flying along a circumferential orbit around a weight (300) at the end of a horizontal pole as the center thereof, that is, toward the sky in front of the trainee, when the trainee hits the ball with a racket.

Description

Tennis practice table structure

The present invention relates to a structure of a tennis practice table that is installed much higher than a person's height.

The present invention is a tennis practice table in which the vertical support 120, which is a pipe-shaped metal structure 100, and the horizontal pole 130 extending horizontally from the vicinity of the upper end of the vertical support are formed in a "L" shape as a whole together with the vertical support. The basic frame 100 or the base of a tennis practice table in which a bracket 101 is installed at a certain height on the wall 400 of a house or building, and a cross pole 130 mounted on the bracket in the horizontal direction with the ground is formed together with the bracket In the frame 100,

It is a technology related to a tennis practice table that can practice tennis by striking a ball 220 hanging from a string from the end 131 of the cross bar of the frame down, and it is a technology focusing on the installation structure of the ball connection string in particular.

Taking advantage of the popularity of tennis, a tennis practice device that can be practiced by a trainee alone has been developed in various forms, and as in the present invention, it can be used as a non-motorized tennis practice device,

go. Tennis practice machine (Announcement date: 1980.08.05.)

~ Hit the ball in the center of 2 poles, adjust the height of the ball by adjusting the pole up and down

me. Multifunctional exercise exercise machine (registration date 2001.01.31.)

~ Hit the ball with a connecting string at the end of the cross pole tied to the vertical pole in the shape of an “A”, install a shield net behind the ball to return to the hitting origin after hitting the ball The structure according to the present invention is similar in appearance to the structure in a state in which a rotating reel capable of pulling or slowing the end is installed on a vertical pole, and the shield net is excluded.

all. Tennis hitting method training device (registration date 2001.11.29.)

~ Hit the ball bound to the upper part of the elastic pole or tied to the center of the vertical upper/lower connection string, without adjusting the height of the ball

La. Portable tennis practice device (Registration Date 2012.03.16.)

~ If you hit the ball connected to the waiter with an elastic connecting string, the ball is hit by the elastic force of the connecting string, and the speed of the ball is controlled by the length of the connecting string.

mind. Table tennis and t-ball exercise equipment that can be played alone (published on June 16, 2015)

~ Bonding elastic vertical poles and horizontal poles in a “L” shape, hitting the ball hanging on the connecting string connected to the end of the horizontal pole, adjusting the height of the ball by adjusting the height of the vertical pole, although it is a technique limited to table tennis and t-ball There is a similarity in appearance with the technology of the invention.

bar. Striking device for games (published on October 22, 2015)

~ Bind the vertical pole and the horizontal pole in a “L” shape, hit the ball temporarily attached to the connecting string connected to the end of the horizontal pole, adjust the height of the ball by adjusting the height of the vertical pole or the horizontal angle of the horizontal pole, hit the ball and blow it Although it is a sending technique, there is a similarity in appearance to the technique of the present invention.

Conventional techniques such as these have been developed and demonstrated, and each of these techniques has contributed to the development of tennis skills while having unique advantages.

Among the six prior art available for non-motorized tennis practice devices listed above,

"go. Tennis Practice Machine (Announcement Date: 1980.08.05.)”

"all. Tennis hitting method training device (Registration Date 2001.11.29.)”

"La. Portable tennis practice device (Registration Date 2012.03.16.)”

Since the three techniques of the present invention have little structural similarity to the technique of the present invention, they are excluded from the discussion for now.

In the remaining three technologies, not the three technologies that are out of the discussion,

"me. The multifunctional exercise exercise machine (registration date 2001.01.31.)” has similarities with the practice table of the present invention in appearance without a shield, but it is different from the exercise table of the present invention in terms of structure as well as function, in particular. There is a big difference, and the key points are as follows.

First of all, there is a stark difference about the ball connection string. As will be described later, in the present invention, the ball connecting string is divided into a front end connecting string 200 and a rear end connecting string 210, and it is a very important issue with respect to its specifications and materials. In particular, in the rear end connection string 210, the ball 220 flies to a trajectory 230 of a certain distance in the air in front of the trainee by hitting the ball, and then repeatedly strikes the ball coming back in front of the trainee while repeatedly hitting it. The material and performance are treated as the most sensitive and important in the practice table in honing the feeling of hitting the ball.

In order to feel the impact on the ball as in real life, the flight trajectory 230 of the ball should be as large as possible so that the horizontal angle of the ball flying in front of the trainee should be as small as possible. In order to do this, the ground height of the cross pole 130 of the practice table should be as high as possible, so the connecting string 210 at the rear end of the wing should also be lengthened. Such a rear end connecting string 210 should be light, as will be described later, and must have an equal level of flexibility and stretchability.

On the other hand, the front end connection string 200, in that it should be a performance and material that requires more tensile force and durability than lightness, "B. There are professional concerns that are difficult to find in the ball ties applied to the “multifunctional exercise trainer”.

Also, “I. Multifunctional exercise exercise machine (registration date 2001.01.31.)”, but in the present invention, as mentioned above, the weight 300, which plays an important role above all else, is connected to the front end of the end guide ring 131 of the cross bar. There is a big difference in its structure, such as being attached to the string 200 . The function or role of the weight 300 will be described later.

Next, in terms of function, “I. Multifunctional exercise exercise machine (registration date 2001.01.31.)” provides a technique of continuously hitting the ball with a certain time difference, such as in a stationary state, whereas the practice stand according to the present invention is more than anything, it is different from a different flight trajectory each time towards the trainee. There is a fundamental difference in functionality in that it provides a technique to hit the flying ball with different distances and different speeds each time (because the maximum reaching point of the hitting ball is different).

That is, according to the direction of the flying ball, in the present invention, it is necessary to quickly secure the hitting position according to the direction of the flying ball and to practice the optimal hitting technique such as whether to hit with a forehand drive or a backhand slice, as in real life, "I. Multifunctional exercise exercise machine (registration date 2001.01.31.)” is lacking.

On the other hand, “No. Table tennis and t-ball exercise equipment that can be played alone (published on June 16, 2015)” or “Bar. The game striking device (published on October 22, 2015)” is also similar in overall appearance to the practice table in the present invention in that it has a structure to hit a ball suspended from a vertical pole, a cross pole, and the end of the cross pole, but its function The difference in structure with the above-mentioned “B. In the same context as in the content of “Multifunctional Exercise Exerciser (Registration Date 2001.01.31.)”, there is a significant difference in the function and structure of the exercise table of the present invention. A detailed description thereof will be omitted.

As for the tennis practice device, the ball should be a ball that actually flies a flying distance with a certain trajectory to the trainee rather than a stationary ball. In addition to being able to feel it, it is a functional aspect that allows you to practice tennis without much effort, even if you do not have to go to the tennis court, in the yard of the house or on the practice table installed in the vacant lot near the house,

It should be able to maintain stability semi-permanently even in the worst weather conditions such as typhoons, the pitch of the ball to be hit should not be distorted or too difficult, and the trainee should not be burdened with installing or removing the training machine whenever he/she wants to practice. Structural aspects, particularly those that make practice easy and safe, should be carefully considered.

In the basic frame 100 of the tennis practice table, the vertical support 120, which is a pipe-type metal structure in which the lower base part 121 is firmly fixed to the ground or the ground 500, a concrete structure, etc. is extended from the lower base part 121, In the basic frame 100 of the tennis practice table, which becomes a central axis extending in the sky direction, and a cross pole 130 extending horizontally from a certain point at the upper end of the vertical support is mounted,

Alternatively, the basic frame of the training table, which is formed by fixing the bracket 101 to a vertical wall of a house or building, and then horizontally extending horizontally with the ground on the bracket 130 is mounted. should be

As the installation structure of the ball connecting string installed on the basic frame, the weight 300 directly below the guide ring 131 at the end of the cross pole from the roller 140 installed on the vertical support or at the height of a person's chest of a house or building mainly As a connecting string connected to the ball, the front end connecting string 200 of a material having greater durability and tensile force than the rear end connecting string 210 ; It is a ball connecting string that is bound to the weight 300 bound to the front end connecting string 200 and hanging the ball 220 down, and the rear end of the material having greater light weight and flexibility than the front end connecting string 200 . Connection string 210; Tennis ball (220) hanging from the rear end of the connecting string; A function of providing a load to the front end connecting string so that the natural fall of the front end connecting string 200 is possible. A weight that is bound to the end of the front end connecting string 200 for multiple purposes, such as a tangling prevention function of the connecting string 200, and a stopper function of the front end connecting string 200 when the front end connecting string 200 is lifted ( 300) can solve the above problem as a structure of a tennis practice table, characterized in that it includes

In the tennis practice table according to the present invention, when a trainee strikes a ball with a racket under a cross pole, the ball flies in a circumferential orbit with the weight 300 at the end of the cross pole as the centripetal point, that is, in the direction of the sky in front of the trainee, and then again by gravity It is a practice table where tennis practice is performed while repeatedly hitting a ball that falls in front of a trainee along the same circumferential curve 230 .

This training table is installed only once, so there is no need for the cumbersome work of installing and disassembling the training table every time a trainee wants to practice hitting. Also, there is no need to go through the trouble of picking up the ball again after batting practice, and it is a big advantage that you can continue semi-permanent tennis batting practice whenever you have time.

In addition, it is natural that even children who have never played tennis will be interested in hitting the ball hanging on the practice table with a racquet. It is difficult to hit a ball that is bounded on a tennis court, but the ball of this practice device is not that difficult. Through this practice table, you can easily become familiar with various types of balls and develop motor nerves from a young age.

Also, for elementary and intermediate tennis trainees, in order to effectively hit a ball that repeatedly flies a flying distance of an appropriate trajectory toward their body, they instantly decide what position and where to hit and where to hit the ball with what posture and hitting technique. It is very effective in honing the practical skills to hit accurately.

Of course, the speed, flight trajectory, and ball rotation angle of the ball flying in front of the trainee are very different from the ball of the practice table flying in front of the trainee. You will be able to demonstrate your skills enough for any pitched ball.

1 is an overall conceptual view as an embodiment of a tennis practice table in which the basic frame according to the present invention is a "L"-shaped metal structure. The lower base 121 of the training stand is fixed to the reinforced concrete structure of the ground 500, and the vertical support 120 extending in the sky direction extending to the lower base 121 of the same is curved in the horizontal direction from the upper end of the vertical support. The cross pole 130 and the roller 140 installed on the vertical support, the

ball connecting strings

200 and 210 and the weight 300, and the ball 220 and the ball trajectory 230 are shown.

2 is an overall conceptual diagram as an embodiment of a tennis practice table in which the basic frame according to the present invention is composed of a bracket 101 fixed to the wall of a house or building and a cross pole 130 mounted on the bracket. The bracket is formed of a combination of three characters: a vertical support part 410, a horizontal support part 420, and a reinforcing support 430, and the rear end of the cross pole 130 is bound to the horizontal support part 420 and extends in the horizontal direction with the ground. The cross pole 130, the roller 140 installed on the wall, the

ball connecting strings

200 and 210, the weight 300, and the ball 220 are shown.

3 is a cross-sectional view of a tennis ball 220 according to an embodiment of the present invention. The outer peripheral surface of the ball is fibrous felt (221 felt), a core made of natural rubber (222 core) on the inside of the copper felt, the inner space of the ball 223 in a state in which compressed air has escaped inside the core, and the inside of the ball at one point on the outer peripheral surface of the ball ( A small hole 226 passing through 223 , a hook string 225 , and a locking rod 224 are shown.

When the basic frame of the tennis practice table is made of a “L”-shaped metal structure, a vertical support 120 is provided first. As an overall strong metal pipe-type pole, stainless steel or aluminum alloy material can be used.

The copper metal pipe-type vertical support 120 has an extruded circular or polygonal shape, with a maximum inner diameter of 8.2 and an outer diameter of 10 (cm). And, for transportation to the installation site or for overseas delivery, it is possible to divide the upper and lower parts of about 4 nodes with means that can be disassembled and combined for overseas delivery, and the front end of the vertical support 120 is tied at the height of the person's chest. An action roller 140 is laid.

The vertical support 120 extends in the sky direction from the lower base 121 made of reinforced concrete or the like on the ground or the ground, and when the trainee hits the ball, the horizontal pole 130 that has to withstand the tension is shaken by stars. It must be able to support the ball without twisting during batting practice so that it can fly freely.

In the case of forming a basic frame of a tennis practice table by using the wall 400 of a house or building as a vertical support to mount the cross pole 130, first, the bracket 101 must be installed on a certain wall surface that is significantly higher than a person's height. The bracket 101 should be at a level that can sufficiently secure the support force that can withstand the strong tension caused by the blow of the ball by fixing the bracket and the cross pole to the wall, that is, the vertical support force, the horizontal support force, and the reinforcement support force. .

The material of the bracket 101 may be a metal material, and its shape may vary. However, when the trainee hits the ball, the cross pole 130 must be firmly fixed to the wall surface 400 so that there is no shaking. When the brackets and rails do not shake, the ball can fly smoothly without twisting during hitting practice.

On the other hand, a guide ring 411 for passing the front end connecting string is installed at a certain point below the bracket so that the front end connecting string 200 to be described later can be connected to the wall roller 140 down from the end of the cross pole through the bracket side. A roller 140 for manipulating the front end connection strap is installed at the height of a person's chest below the bracket.

Next, the horizontal pole 130 is installed on the upper end of the vertical support 120 or the bracket 101 . The cross pole is made in a straight line length of about 2 m so that there is no hindrance to the trainee wielding the racquet and practicing striking under it, and is formed in a form that is gradually narrowed from the upper end of the vertical support 120 to the guide ring 131 at the end of the cross pole. In this way, the formative beauty of the training table is emphasized within the range of maintaining the safety and stability of the training table, and the effect of the load and wind on the upper part of the training table is minimized.

At the end of the pole, a guide ring 131 with an inner diameter of 1.5 and an outer diameter of 3 (cm) that the front end connecting string 200 can penetrate and the weight 300 cannot penetrate is installed, and the ground height of the pole is 7~ to be 8 m. The reason that the rail of the practice table is installed so high is that the flight trajectory 230 of the ball is maximized to some extent when hitting the ball to minimize the horizontal angle of the ball at the ball striking point, so that the This is to make them as similar as possible so that the trainees can practice hitting realistically. The ground height may be more than 10m, but the higher the height, the greater the influence of the wind on the connecting string 210, so it often interferes with practice, and the lower the lower, the less the feeling of hitting.

Next, the vertical support 120 or the vertical wall surface 400 of a house, etc., the roller 140 to be installed at the height of a person's chest can be both electric and fully manual. In addition, it is possible to drive the roller using a digital signal of an application installed on the trainee's smart phone.

Next, the ball connection strings (200, 210) are installed on the practice table.

The front end connecting string 200 bound to the roller 140 penetrates the inside of the vertical support 120 and the cross pole 130, or climbs up the wall 400 of the house, and the bracket guide ring 411. After passing through the cross-pole end guide ring 131 is bound to the weight (300).

The front end connecting string 200 is made of a stainless wire with an outer diameter of 2.5 mm and 20 m in length that is as strong and somewhat flexible as possible because it does not directly affect the flight of the ball, and the weight 300 is the roller 140 A function of providing a load to the connecting string at the front end so that the front end connecting string 200 can naturally fall toward the ground by the load of the weight in the state in which the weight is released. For the purpose of a stopper function that prevents passage of the guide ring 131, etc., it is laid with one 150 g of steel beads coated with a silicone film and surface fluorescence for impact prevention.

Next, the rear end connecting string 210 is bound downward to the weight 300 . The ball 220 is bound to the rear end of the connecting string. The weight 300 becomes the dividing point and the connection point between the front end connection string 200 and the rear end connection string 210, and when the weight is wound around the roller and the weight is in close contact with the cross pole end guide ring 131, the weight ( The front end connecting string 200 by the load of 300) and the ball 220, and the rear end connecting string 210 by the load of the ball 220 maintain a taut state.

The material and specifications of the connecting

straps

200 and 210 will be further explained. The front end connecting string 200 and the rear end connecting string 210 are different in material and standard. The material and specifications of the connecting string are as sensitive and important as the safety of the tennis practice table as a whole, and are related to the purpose of laying weights.

For example, if the material of the rear end connecting string 210 is even a little stiff and inflexible, or if it is not, the string is rather thick, somewhat heavy, or has elasticity like a rubber band, etc., hit the ball with a racket. When applied, the ball 220 does not fly in a normal circumferential orbit. That is, the ball does not extend far, or the ball is twisted in the air, or it fluctuates up and down. In other words, the practice table becomes useless.

Therefore, the rear end connecting string 210 should be thin and light in weight above all else, and should not be easily broken without stretching even under strong tension. That is, when the ball 220 flies in a flexible and stable flight, it must be made of a material and standard with the performance to prevent the ball from running away with minimum resistance. It can come back and normal repeated hitting practice becomes possible.

One of the materials suitable for the above conditions is cotton yarn (cotton thread, about 2.5mmT). The cotton yarn is light, flexible, and strong against UV rays, but it has the disadvantage of receiving some air resistance, but it is relatively easy. However, not only chemical yarns such as PE and silicon yarns, but also cotton yarns and chemical yarns are not suitable because they lack flexibility or have elasticity like rubber bands. The above-mentioned problems or problems caused by sunlight will obviously occur.

However, the problem is, it is difficult to obtain a thin, light and flexible rear end connection string 210 made of a material that does not break even after being exposed to ultraviolet rays for a very long time and will not interfere with hitting practice. That is, the connecting string made of the above cotton braid is a consumable that can be used normally for only a certain period of time, and it is necessary to check the condition of the rear end connecting string 210 and replace it with a new connecting string. There may also be cases where (210) is cut just below a weight that is out of reach.

As such, when the rear end connecting string 210 is cut during ball striking practice and it is necessary to lower the front end connecting string 200 that cannot be reached, the front end connecting string 200 to be located just below the rail guide ring 131 ), if the weight 300 is not provided, it is difficult to lower the front end connecting string 200 down to the guide ring 131 to the height of the chest of the trainee only by the operation of the roller 140 .

On the other hand, in the case of a multi-use facility that anyone can use free of charge as a practice table made of a “L”-shaped metal structure 100 according to the present invention, the rear end connecting string 210 and a ball ( 220), it is preferable that the trainee using this practice table should bring it and connect it to the connecting string 200 at the front end of the training table to practice hitting. At this time, in order to connect the rear end connecting string 210 and the ball 220 brought by the trainee, a weight 300 is required under the front end connecting string 200 .

That is, during the time when the training table is not in use, the front end connecting string 200 or the weight 300 must remain in close contact with the guide ring 131 so that it does not shake in the air, and when the trainee starts hitting practice, By operating the roller 140, the weight 300 is lowered to the height of the trainee's chest, so that he can practice hitting by hanging the connecting string 210 and the ball 220 at the rear end brought by the trainee to the weight. .

At this time, if the weight 300 is not laid at the end of the connecting string 200 at the front end, the connecting string at the time of lowering or ascending control of the connecting string 200 at the front end is connected to the inside of the pipe 100 or the roller of the training stand. In addition to the problem of tangling in (140), it is difficult to identify where the end of the copper is descending, and it will also be difficult to catch by the wind. Even for this reason, it cannot be said that the laying of the weight 300 is necessary.

And, after the trainee has finished practicing, the rear end connection string 210 and the ball 220 are separated and recovered from the weight 300, and then the weight 300 is returned to the original position under the guide ring 131 manually or semi-automatically. It is necessary to be returned to or be automated so that the weight 300 automatically rises and returns after 1 to 2 minutes after the point of descent of the weight 300.

In addition, as the weight, a plurality of the same light weight 300 may be configured, and a plurality of light weights 300 of different materials and different shapes may be configured. For example, it is possible to use a chain with a certain length instead of an iron bead with a single weight. It is a dimension of safety accident prevention by the weight (300).

In addition, the biggest reason for stopping the weight 300 in close contact with the rail guide ring 131 just below the pole guide ring 131 and practicing striking is, as in the reason for installing the cross pole 130 of the training table high, the radius of rotation of the ball. in order not to affect

However, on the other hand, it can be assumed that the front end connecting string 200 is all configured with a chain. At this time, it may not be difficult to place the roller 140 at or near the seat of the guide ring 131 at the end of the cross pole 130 and prevent the chain from getting tangled when winding or unwinding the chain with the copper roller 140 . In addition, the end of the copper does not blow lightly in the wind, so there will be no difficulty for trainees to identify them.

That is, the connecting string made of a chain performs the original role of the front end connecting string 200 and the function of the weight 300 at the same time complexly, and the weight 300 at this time is the last part of the chain will be

In the case of the front end connecting string 200 made of such a chain, after the trainee lowers the end of the chain connecting string 200 to chest height, the rear end connecting string 210 on which the ball is hung is placed on the last end of the chain. You can do normal tennis hitting practice by hanging, and when hitting practice is finished, manually or semi-automatically or after 1 to 2 minutes after the descent of the chain, the chain connecting string 200 is automatically raised to the roller 140. . The drawing of the front end connecting string 200 made of a chain is omitted.

Next, the ball 220 will be described. Usually, a tennis ball for competition contains felt (felt 221) on the outer peripheral surface, a core made of natural rubber (core 222) on the inside of the felt, and compressed air inside the core. Compressed air is included to improve elasticity in the ground, but compressed air is not required because the ball in the present invention is not a ball bound to the ground. Only the elasticity of the rubber and the elasticity of the racquet is enough for realistic hitting practice.

The ball 220 in the present invention has a length of about 3 to 4 cm through a small hole 226 with a diameter of less than 2 mm drilled from the outer circumferential surface of the ball 221 to the inside 223 of the ball, and the middle point is a ring string 225 ) Insert the locking bar 224 bound by the first end into the inside 223 of the ball, and then pull the other end of the hook string 225 remaining outside the small hole 226 of the ball. 224 is caught on the inner circumferential surface of the core 222 inside the ball, thereby making it impossible for the ball 220 to be separated from the ring string 225 .

The material of the locking bar 224 may be any material that is not easily bent or broken, such as wood, metal, or plastic, and the thickness varies depending on the material, but in the case of wood, it is okay if it is a cylindrical shape of about 5 mm. By connecting one end of the hook string outside the hole to the end of the rear end connecting string 210, the tennis practice table according to the present invention is finally completed.

The description of the ground concrete structure is omitted.

Claims

In creating a basic frame for forming a tennis practice table, the first. The lower base 121 firmly fixed to the ground or the ground 500, a concrete structure, etc., a vertical support 120, a pipe-type metal structure extending from the lower base to the sky to become the central support axis of the training stand, near the upper end of the vertical support at The cross pole 130, which is a pipe-shaped metal structure that is bent or curved and extends horizontally, is the basic frame 100 of the “L”-shaped tennis practice table composed of all these metal structures, or the second. A wall bracket 101 for mounting a cross pole installed at a certain height on the wall of a house or building, a vertical support 410 that is fixed to the vertical wall 400, a horizontal support 420 that mounts a cross pole, a horizontal support and Reinforcing support 430, which binds both sides in the diagonal direction of the vertical wall surface 400 and reinforces the supporting force of the horizontal support part, is formed by a combination of the three characters, and the rear end of the cross pole 130 is on the horizontal support part 420 Tennis practice table basic frames (101, 130) consisting of a cross pole (130) that is bound and extends in the horizontal direction with the ground, the basic frame of the tennis practice table in which one of the two tennis practice table basic frames is selected; In the structure of installing the ball connecting strings 200 and 210 to the selected one basic frame, the weight 300 directly below the guide ring 131 at the end of the cross pole from the roller 140 installed on the basic frame or the wall. ) as a ball connecting string connected to the front end connecting string 200 of a material having greater durability and tensile force than the rear end connecting string 210 ; It is a ball connecting string that is bound to the weight 300 bound to the front end connecting string 200 and hanging the ball 220 down, and the rear end of the material having greater light weight and flexibility than the front end connecting string 200 . connection string 210; Tennis ball (220) hanging from the rear end of the connecting string; A function of providing a load to the front end connecting string so that the natural fall of the front end connecting string 200 is possible. It is characterized by including a weight 300 that is bound to the end of the front end connecting string 200 for multi-purposes such as a tangling prevention function of the front end connecting string, a stopper function of the front end connecting string when the ascending operation of the front end connecting string is operated tennis practice table
In the tennis practice table of claim 1, the middle waist part is bound by the first end of the hook string 225 through a small hole 226 penetrating from one point on the outer peripheral surface of the ball 220 to the inner 223 of the ball 3~ After inserting a 4 cm-long locking rod 224 into the inside 223 of the ball, pull the other end of the loop string 225 remaining outside the hole 226 from the outside of the ball 220 to pull the locking rod 224 ) is caught on the inner circumferential surface of the core 222 from the inside of the ball 223, so that the ball 220 cannot be separated from the ring string 225. tennis practice table.