WO2022039443A1 - Structure de cadre d'entraînement au tennis - Google Patents

Structure de cadre d'entraînement au tennis Download PDF

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Publication number
WO2022039443A1
WO2022039443A1 PCT/KR2021/010757 KR2021010757W WO2022039443A1 WO 2022039443 A1 WO2022039443 A1 WO 2022039443A1 KR 2021010757 W KR2021010757 W KR 2021010757W WO 2022039443 A1 WO2022039443 A1 WO 2022039443A1
Authority
WO
WIPO (PCT)
Prior art keywords
ball
connecting string
string
tennis
tennis practice
Prior art date
Application number
PCT/KR2021/010757
Other languages
English (en)
Korean (ko)
Inventor
강일석
강찬
Original Assignee
강일석
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2020200003046U external-priority patent/KR200495480Y1/ko
Priority claimed from KR2020200003154U external-priority patent/KR20220000539U/ko
Application filed by 강일석 filed Critical 강일석
Publication of WO2022039443A1 publication Critical patent/WO2022039443A1/fr
Priority to US18/092,245 priority Critical patent/US20230149790A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/38—Training appliances or apparatus for special sports for tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B43/00—Balls with special arrangements
    • A63B43/007—Arrangements on balls for connecting lines or cords
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/0073—Means for releasably holding a ball in position; Balls constrained to move around a fixed point, e.g. by tethering
    • A63B69/0091—Balls fixed to a movable, tiltable or flexible arm
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
    • A63B71/02—Games or sports accessories not covered in groups A63B1/00 - A63B69/00 for large-room or outdoor sporting games
    • A63B71/023—Supports, e.g. poles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B39/00—Hollow non-inflatable balls, i.e. having no valves
    • A63B2039/006—Hollow non-inflatable balls, i.e. having no valves pressurised
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/02—Tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2210/00—Space saving
    • A63B2210/50—Size reducing arrangements for stowing or transport
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/09—Adjustable dimensions
    • A63B2225/093—Height

Definitions

  • 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.
  • 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,
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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”.
  • 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.
  • 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).
  • the ball should be a ball that actually flies a flying distance with a certain trajectory to the trainee rather than a stationary ball.
  • 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,
  • 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,
  • 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,
  • 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.
  • 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
  • Connection string 210 Tennis ball (220) hanging from the rear end of the connecting string;
  • 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
  • the ball 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.
  • FIG. 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.
  • FIG. 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.
  • FIG. 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.
  • a vertical support 120 is provided first.
  • stainless steel or aluminum alloy material can be used as an overall strong metal pipe-type pole.
  • 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.
  • the bracket 101 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a weight 300 is required under the front end connecting string 200 .
  • 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. .
  • 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.
  • 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.
  • 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.
  • 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).
  • 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
  • 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.
  • 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
  • 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.
  • 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.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Tools (AREA)

Abstract

La présente invention concerne un cadre d'entraînement au tennis en forme de "giyeok" prévu pour être beaucoup plus haut que la taille d'une personne à partir du sol ou un cadre d'entraînement au tennis pouvant être fixé à une paroi disposé sur un support (101) disposé à un certain point d'une maison ou d'un bâtiment, qui est bien plus haut que la taille de la personne. Dans la formation du cadre d'entraînement au tennis, les caractéristiques de cordes de raccordement (200, 210) qui suspendent une balle sont plus importantes que pour un cadre de base. Une technique pour un cadre d'entraînement au tennis, dans laquelle de grandes préoccupations concernant les caractéristiques de cordes de raccordement de balle dominent, n'a pas encore été décrite. De plus, pour un fonctionnement normal de cordes de raccordement de balle, un poids peut être essentiellement obligatoire pour les cordes de raccordement de balle. Le cadre d'entraînement au tennis selon la présente invention est un cadre d'entraînement avec lequel un apprenant effectue un entraînement au tennis tout en frappant de manière répétée une balle tombant devant l'apprenant le long d'une courbe circonférentielle au moyen de la gravité après avoir volé le long d'une orbite circonférentielle autour d'un poids (300) à l'extrémité d'un poteau horizontal en tant que centre de celui-ci, c'est-à-dire vers le ciel devant l'apprenant, lorsque l'apprenant frappe la balle avec une raquette.
PCT/KR2021/010757 2020-08-19 2021-08-12 Structure de cadre d'entraînement au tennis WO2022039443A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US18/092,245 US20230149790A1 (en) 2020-08-19 2022-12-31 Structure for tennis practice frame

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR2020200003046U KR200495480Y1 (ko) 2020-08-19 2020-08-19 고수부지용 테니스 연습대
KR20-2020-0003046 2020-08-19
KR20-2020-0003154 2020-08-26
KR2020200003154U KR20220000539U (ko) 2020-08-26 2020-08-26 벽면부착형 테니스 연습대

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/092,245 Continuation-In-Part US20230149790A1 (en) 2020-08-19 2022-12-31 Structure for tennis practice frame

Publications (1)

Publication Number Publication Date
WO2022039443A1 true WO2022039443A1 (fr) 2022-02-24

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PCT/KR2021/010757 WO2022039443A1 (fr) 2020-08-19 2021-08-12 Structure de cadre d'entraînement au tennis

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US (1) US20230149790A1 (fr)
WO (1) WO2022039443A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023230671A1 (fr) * 2022-06-03 2023-12-07 Rebounda Holdings Pty Ltd Dispositif d'entraînement à un sport de balle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150073333A (ko) * 2013-12-23 2015-07-01 서정규 구기 연습기구
KR20170014116A (ko) * 2015-07-29 2017-02-08 홍성주 구기 종목 타격연습기
US20170340939A1 (en) * 2016-05-27 2017-11-30 Samuel Chen Suspended target trampoline game
KR101932902B1 (ko) * 2017-10-17 2019-04-05 연세대학교 원주산학협력단 골반 교정 운동 기구 및 그것의 제어 방법
KR102035710B1 (ko) * 2018-12-10 2019-10-23 문태현 테니스 연습기구

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150073333A (ko) * 2013-12-23 2015-07-01 서정규 구기 연습기구
KR20170014116A (ko) * 2015-07-29 2017-02-08 홍성주 구기 종목 타격연습기
US20170340939A1 (en) * 2016-05-27 2017-11-30 Samuel Chen Suspended target trampoline game
KR101932902B1 (ko) * 2017-10-17 2019-04-05 연세대학교 원주산학협력단 골반 교정 운동 기구 및 그것의 제어 방법
KR102035710B1 (ko) * 2018-12-10 2019-10-23 문태현 테니스 연습기구

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023230671A1 (fr) * 2022-06-03 2023-12-07 Rebounda Holdings Pty Ltd Dispositif d'entraînement à un sport de balle

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