CN108992870B - Practice ball device for assisting in judging flapping motion direction - Google Patents
Practice ball device for assisting in judging flapping motion direction Download PDFInfo
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- CN108992870B CN108992870B CN201810749066.9A CN201810749066A CN108992870B CN 108992870 B CN108992870 B CN 108992870B CN 201810749066 A CN201810749066 A CN 201810749066A CN 108992870 B CN108992870 B CN 108992870B
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- 230000033001 locomotion Effects 0.000 title claims abstract description 24
- 210000000707 wrist Anatomy 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 101100010303 Drosophila melanogaster PolG1 gene Proteins 0.000 claims 1
- 101150078890 POLG gene Proteins 0.000 claims 1
- 238000010009 beating Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 229920001875 Ebonite Polymers 0.000 description 2
- 210000000887 face Anatomy 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 230000004973 motor coordination Effects 0.000 description 2
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004641 brain development Effects 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 210000004247 hand Anatomy 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000036630 mental development Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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- 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
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Abstract
An exercise ball device for assisting in judging a flapping motion direction comprises an exercise ball and an external wrist guard, wherein the exercise ball comprises a ball shell and an internal light ball, the internal light ball comprises a light ball shell and a light ball body, the light ball body is arranged in the light ball shell, the ball shell is fixedly connected with the light ball shell, the light ball body comprises a lens cover, a circuit board, a light ball counterweight base and a magnet slot, the circuit board is arranged on the light ball counterweight base, five direction indicating signs are arranged on the circuit board, and light-emitting devices are arranged in the five direction indicating signs; the five direction indicators are distributed in a cross-shaped frame; four magnet slots are formed in the photosphere counterweight base and are respectively arranged below the four direction indicators, and magnets are arranged in the magnet slots; the lens cover is arranged above the circuit board and is close to the inner surface of the photosphere shell; a magnet is arranged in the external wrist guard. The invention has simple structure and low realization cost, and can realize the control of the ball motion direction by the user selecting the beating part.
Description
Technical Field
The invention relates to the field of sports equipment, in particular to a ball training device for assisting in judging a flapping motion direction.
Background
More and more toys are used in new times, and many children like playing ball games. When a ball is placed in front of a child, the child can touch and play the ball with the small foot. The ball sports not only accord with the physiological and psychological characteristics of children, but also have more benefits on the physical and mental development of the children. The ball game promotes the hand-eye coordination of children: the playing methods of ball games are various, such as dribbling, kicking, catching and shooting, and each playing method is to enable the whole body of a child to exercise, so that the whole body exercise is achieved, and more importantly, the hands and eyes are coordinated, so that the body building and brain development promoting effects are achieved. Ball games promote the development of child's motor coordination ability: when playing the ball, the user needs to run, jump and clap, and the repeated actions can help the child to develop the motor skills and improve the motor coordination ability of the child. Ball games can improve the judgment ability of children: when a child wants to play a good ball game, the child must judge the moving direction of the good ball and clearly see where the opponent kicks the ball, so that the child quickly makes a response, and can continue playing only by receiving the ball, and the child can be greatly helped in judging the ability of the head and mind of the child by repeating the steps for many times, and the judgment ability of the child is improved.
Most of the existing balls do not have a direction indicating function, and a user cannot control the movement direction of the ball according to the flapping part. For many novices and children, the movement direction of the ball after falling to the ground is difficult to judge, sometimes the ball is shot away, so that the ball is not transported continuously, and even accidents may occur in the ball picking process. And when a plurality of people play the ball, the ball can be hit by other people. Therefore, it is of great significance to develop a practice ball that can assist in determining the direction of a flapping motion.
Disclosure of Invention
The invention aims to solve the technical problem of providing a practice ball device which has simple structure and low cost and can realize auxiliary judgment of the flapping motion direction by controlling the motion direction of a ball by selecting a flapping part by a user.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an exercise ball device for assisting in judging a flapping motion direction comprises an exercise ball and an external wrist guard, wherein the exercise ball comprises a ball shell and an internal light ball, the internal light ball comprises a light ball shell and a light ball body, the light ball body is arranged in the light ball shell, the ball shell is fixedly connected with the light ball shell, the light ball body comprises a lens cover, a circuit board, a light ball counterweight base and a magnet slot, the circuit board is arranged on the light ball counterweight base, five direction indicating signs are arranged on the circuit board, and light-emitting devices are arranged in the five direction indicating signs; the five direction indicators are distributed in a cross-shaped frame, four of the five direction indicators are positioned at four end points of the cross-shaped frame, and the other direction indicator is positioned at the center of the cross-shaped frame; four magnet slots are formed in the photosphere counterweight base and are respectively arranged below the four direction indicators, and magnets are arranged in the magnet slots; the lens cover is arranged above the circuit board and is close to the inner surface of the photosphere shell; a magnet is arranged in the external wrist guard.
Furthermore, the light ball shell and the ball body shell are transparent shells.
Furthermore, a battery jar is arranged on the photosphere counterweight base and can be arranged at the center of the photosphere counterweight base, a battery is arranged in the battery jar, and the battery is electrically connected with the circuit board.
Further, five direction indicator include four arrow point indicators and a circular indicator, and four arrow point indicators are located four endpoints of cross frame, and circular indicator is located the center of cross frame, and four arrow point indicator's arrow all dorsad the center of cross frame, and the light that four arrow point indicators sent passes through lens hood and enlargies on the projection to the spheroid shell behind the photosphere casing.
Further, the lens cover is fixedly connected with the photosphere counterweight base through a support.
Furthermore, the sphere shell is fixedly connected with the photosphere shell through a fixing rod, one end of the fixing rod is fixedly connected with the sphere shell, and the other end of the fixing rod is fixedly connected with the photosphere shell. The number of the fixed rods can be more than three, and each fixed rod is arranged in the sphere shell. The fixed rod may be a hard rubber rod. The fixed rod can be replaced by a supporting seat and the like, one end of the supporting seat is fixedly connected with the sphere shell, and the other end of the supporting seat is fixedly connected with the photosphere shell.
Further, the light emitting devices in the five direction indicators can be diodes or bulbs.
Further, if the distance from the center line of the direction indicator to the center line of the lens cover is u, the distance from the center line of the lens cover to the spherical shell is v, and the focal length of the lens cover is f, f < u <2f, v >2 f. By sizing u, v and f, the size of the arrow and the circular spot projected onto the sphere shell can be achieved.
Further, still install the oscillator on the circuit board, the one end of oscillator is connected to the positive terminal of battery after all parallelly connected with the negative pole end of the luminescent device in five direction indicators, and the other end of oscillator links to each other with the grid of N channel triode, and the drain of N channel triode passes through resistance and links to each other with the positive terminal of luminescent device, and the source of N channel triode connects to the negative pole end of battery, still has parallelly connected electric capacity between the negative pole end of battery and the other end of oscillator. Under the effect of oscillator, when the exercise ball receives external force, N channel triode control circuit switches on, and five luminescent device all give out light, when the exercise ball does not receive external force, still can postpone the time of putting out of luminescent device under the effect of electric capacity.
The built-in photosphere provides the selection of direction of motion for the bobble, and under the effect of photosphere counter weight base, five direction indicators all can remain the level always, can not rotate along with the rotation of spheroid shell. The external wrist band not only can play the effect of protection user's wrist, under the effect of the magnet suction in magnet and the magnet groove on the photosphere counter weight base in the external wrist band, can also make one of them directional user of four arrow indicator, ensure that one of them arrow indicator and user's arm form collinear gesture, realize the directional accuracy of arrow indicator at the in-process of ball motion.
The working principle is as follows: the user wears external wrist band on the wrist, and the one side that has magnet is with user's palm coplanar, and when the user patted the bobble, the exercise ball received external force, and under the effect of oscillator, N channel triode control circuit switched on, and five luminescent device are all luminous. The light rays emitted by the circular indicator positioned at the center of the cross-shaped frame are amplified by the lens cover, pass through the photosphere shell and then are projected onto the sphere shell, and a circular light spot is formed on the sphere shell. Light rays emitted by four arrow indicators positioned at four endpoints of the cross-shaped frame are amplified by the lens cover and projected onto the spherical shell after passing through the photosphere shell, arrows are formed on the spherical shell, and the four arrows on the spherical shell all face to the direction of the circular light spot. The user needs to move the ball to which side, and only needs to pat the corresponding arrow and the circular light spot on the ball body shell. If the ball needs to move to the left, only the arrow towards the left above the ball shell needs to be beaten; when the ball needs to move rightwards, only the arrow head towards the right above the ball body shell needs to be patted; when the ball needs to move forwards, only the arrow which faces forwards above the ball body shell needs to be beaten; when the ball needs to move backwards, only the arrow towards the back above the ball body shell needs to be flapped; when the ball needs to move in place, only the circular light spot on the shell of the ball body needs to be flapped.
The invention has simple structure and low realization cost, can realize the control of the movement direction of the ball by the user selecting the flapping part, is particularly suitable for children, is favorable for reducing the danger caused by uncontrollable playing of the ball and reducing the injury or loss; meanwhile, the enthusiasm of children in movement can be effectively improved.
Drawings
FIG. 1 is a schematic view of an external structure of a practice ball of the practice ball apparatus for assisting in determining a direction of a flapping motion according to the present invention;
FIG. 2 is a view A-A of the exercise ball of FIG. 1;
FIG. 3 is a view B-B of the practice ball of FIG. 2;
FIG. 4 is a schematic view of the external structure of the light ball body of the practice ball;
FIG. 5 is a view B-B of the light ball body of FIG. 4;
FIG. 6 is a perspective view of the light ball body shown in FIG. 4;
FIG. 7 is a schematic view showing the arrangement of four arrow indicators and one circular indicator;
FIG. 8 is a perspective view of four arrow indicators and a circular indicator on the housing of a sphere;
FIG. 9 is a schematic view of the imaging principle of the lens housing;
fig. 10 is a schematic diagram of a circuit structure on a circuit board.
In the figure: 1-practice ball; 2-spherical shell; 3-built-in photosphere; 4-light ball housing; 5-light ball body; 6-circuit board; 7-light ball counterweight base; 8-magnet slot; 9-1-arrow indicator; 9-2-circular indicator; 10-light emitting device; 11-lens cover; 12-battery jar; 13-the stent; 14-fixed bar; 15-an oscillator; 16-capacitance; 17-N channel triode; 18-arrow head; 19-circular spot.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Referring to fig. 1-7, an exercise ball device for assisting in judging a flapping motion direction comprises an exercise ball 1 and an external wrist protector (not shown in the figure), wherein the exercise ball 1 comprises a ball shell 2 and an internal light ball 3, the internal light ball 3 comprises a light ball shell 4 and a light ball body 5, the light ball body 5 is arranged in the light ball shell 4, the ball shell 2 is fixedly connected with the light ball shell 4, the light ball body 5 comprises a lens cover 11, a circuit board 6, a light ball counterweight base 7 and a magnet slot 8, the circuit board 6 is arranged on the light ball counterweight base 7, five direction indicators are arranged on the circuit board 6, and light-emitting devices 10 are arranged in the five direction indicators; the five direction indicators are distributed in a cross-shaped frame, four of the five direction indicators are positioned at four end points of the cross-shaped frame, and the other direction indicator is positioned at the center of the cross-shaped frame; four magnet slots 8 are formed in the photosphere counterweight base 7, the four magnet slots 8 are respectively arranged below the four direction indicators, and magnets (not shown in the figure) are arranged in the magnet slots 8; the lens cover 11 is arranged above the circuit board 6, and the lens cover 11 is closely adjacent to the inner surface of the photosphere shell 4; a magnet (not shown in the figure) is arranged in the external wrist guard. The lens cover 11 is fixedly connected with the photosphere counterweight base 7 through a bracket 13. The light ball shell 4 and the ball body shell 2 are transparent shells. The photosphere counterweight base 7 is also provided with a battery groove 12, the battery groove 12 can be arranged at the center of the photosphere counterweight base 7, and a battery is arranged in the battery groove 12 and is electrically connected with the circuit board 6. The sphere shell 2 is fixedly connected with the light sphere shell 4 through a fixing rod 14, one end of the fixing rod 14 is fixedly connected with the sphere shell 2, and the other end of the fixing rod 14 is fixedly connected with the light sphere shell 4. In this embodiment, the fixed rod 14 may be a hard rubber rod. The fixing rod can be replaced by a supporting seat and the like.
Referring to fig. 7, the five direction indicators include four arrow indicators 9-1 and a circular indicator 9-2, the four arrow indicators 9-1 are located at four end points of the cross-shaped frame, the circular indicator 9-2 is located at the center of the cross-shaped frame, the arrows of the four arrow indicators 9-1 all face away from the center of the cross-shaped frame, and light emitted from the four arrow indicators 9-1 is enlarged by the lens cover 11, passes through the photosphere housing 4, and is projected onto the globe housing 2. The light emitting devices 10 in the five direction indicators may be diodes or light bulbs, etc. In this embodiment, a diode is selected.
Referring to fig. 9, if u is the distance from the center line of the direction indicator to the center line of the lens cover, v is the distance from the center line of the lens cover to the globe, and f is the focal length of the lens cover, f < u <2f, v >2 f. By adjusting the size of u, v and f, the size of the arrow and the circular spot projected onto the sphere shell can be adjusted. In fig. 9, the lens cover 11 is indicated by a straight line with a double-headed arrow in order to make the schematic view clearer.
Referring to fig. 10, an oscillator 15 is further mounted on the circuit board, one end of the oscillator 15 is connected to the positive terminal of the battery after being connected in parallel with the negative terminals of the light emitting devices 10 in the five direction indicators, the other end of the oscillator 15 is connected to the gate of the N-channel triode 17, the drain of the N-channel triode 17 is connected to the positive terminal of the light emitting device 10 through a resistor, the source of the N-channel triode 17 is connected to the negative terminal of the battery, and a capacitor 16 is further connected in parallel between the negative terminal of the battery and the other end of the oscillator 15. Under the action of the oscillator 15, when the training ball 1 is subjected to external force, the control circuit of the N-channel triode 17 is conducted, all the five light-emitting devices 10 emit light, and when the training ball 1 is not subjected to the external force, the extinguishing time of the light-emitting devices 10 can be delayed under the action of the capacitor 16.
The built-in photosphere 3 provides the selection of motion direction for the bobble, and under the effect of photosphere counter weight base 7, five direction indicators can all keep the level, can not rotate along with the rotation of spheroid shell 2. The external wrist guard not only can play a role in protecting the wrist of a user, but also can enable one of the four arrow indicators 9-1 to point to the user under the action of the magnet in the external wrist guard and the magnet attraction force in the magnet groove 8 on the photosphere counterweight base 7, so that a collinear posture is formed between one of the arrow indicators 9-1 and the arm of the user, and the pointing accuracy of the arrow indicator in the ball movement process is realized.
The working principle is as follows: the user wears the external wrist band on the wrist, and the one side that has the magnet is with user's palm, and when the user patted the bobble, the exercise ball received external force, and under the effect of oscillator 15, N channel triode 17 control circuit switched on, and five luminescent device 10 are all luminous. The light rays emitted by the circular indicator 9-2 positioned at the center of the cross-shaped frame are amplified by the lens cover 11, pass through the photosphere shell 4 and then are projected on the sphere shell 2, and a circular light spot 19 is formed on the sphere shell 2. The light rays emitted by the four arrow indicators 9-1 at the four end points of the cross-shaped frame are enlarged by the lens cover 11, pass through the light ball housing 4 and are projected onto the ball housing 2, so that the arrows 18 are formed on the ball housing 2, and the four arrows 18 on the ball housing 2 are all oriented to the direction of the circular light spot 19 (see fig. 8). The user needs to move to which side of the sphere just by tapping the corresponding arrow 18 and circular spot 19 on the sphere's outer shell. If the ball needs to move to the left, only the arrow 18 facing to the left above the ball body shell 2 needs to be tapped; when the ball needs to move rightwards, only the arrow 18 facing rightwards above the ball body shell 2 needs to be beaten; when the ball needs to move forwards, only the arrow 18 which faces forwards above the ball body shell 2 needs to be beaten; when the ball needs to move backwards, only the arrow 18 facing backwards above the ball body shell 2 needs to be beaten; when the ball needs to move in place, only the circular light spot 19 on the ball shell 2 needs to be tapped.
Claims (8)
1. An exercise ball device for assisting in judging a flapping motion direction is characterized by comprising an exercise ball and an external wrist guard, wherein the exercise ball comprises a ball shell and an internal light ball, the internal light ball comprises a light ball shell and a light ball body, the light ball body is arranged in the light ball shell, the ball shell is fixedly connected with the light ball shell, the light ball body comprises a lens cover, a circuit board, a light ball counterweight base and a magnet slot, the circuit board is arranged on the light ball counterweight base, five direction indicating signs are arranged on the circuit board, and light-emitting devices are arranged in the five direction indicating signs; the five direction indicators are distributed in a cross-shaped frame, four of the five direction indicators are positioned at four end points of the cross-shaped frame, and the other direction indicator is positioned at the center of the cross-shaped frame; four magnet slots are formed in the photosphere counterweight base and are respectively arranged below the four direction indicators, and magnets are arranged in the magnet slots; under the action of the photosphere counterweight base, the five direction indicators can be kept horizontal all the time and cannot rotate along with the rotation of the spherical shell; the lens cover is arranged above the circuit board and is close to the inner surface of the photosphere shell; a magnet is arranged in the external wrist guard;
the light ball shell and the ball body shell are transparent shells.
2. The device for practicing golfing with assistance in determining a direction of flapwise movement of claim 1 wherein the five direction indicators include four arrow indicators located at the four ends of the cross and one circular indicator located at the center of the cross.
3. The device for practicing racket exercising for assisting in judging flapping directions according to claim 1 or 2, wherein the light ball counter weight base further comprises a battery slot, the battery slot is formed in the center of the light ball counter weight base, a battery is arranged in the battery slot, and the battery is electrically connected with the circuit board.
4. The device for practicing golfing assisted decision on direction of tapping motion as claimed in claim 1 or 2, wherein the lens hood is fixedly connected to the photosphere counterweight base by a support.
5. The device for practicing football with auxiliary judgment on the direction of flapping motion as claimed in claim 1 or 2, wherein the outer sphere shell is fixedly connected with the light sphere shell through a fixing rod, one end of the fixing rod is fixedly connected with the outer sphere shell, and the other end of the fixing rod is fixedly connected with the light sphere shell.
6. The device as claimed in claim 5, wherein the fixing bar is replaced by a support base, one end of the support base is fixed to the ball housing, and the other end of the support base is fixed to the light ball housing.
7. The device for practicing polg exercise for assisting judgment of direction of flapping according to claim 1 or 2, wherein the light emitting devices in the five direction indicators are diodes or light bulbs.
8. The device for practicing football in assisting judgment of a flapping motion direction according to claim 1 or 2, wherein an oscillator is further mounted on the circuit board, one end of the oscillator is connected with the negative ends of the light emitting devices in the five direction indicators in parallel and then connected to the positive end of the battery, the other end of the oscillator is connected with the grid electrode of the N-channel triode, the drain electrode of the N-channel triode is connected with the positive end of the light emitting device through a resistor, the source electrode of the N-channel triode is connected to the negative end of the battery, and a capacitor is further connected between the negative end of the battery and the other end of the oscillator in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749066.9A CN108992870B (en) | 2018-07-10 | 2018-07-10 | Practice ball device for assisting in judging flapping motion direction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749066.9A CN108992870B (en) | 2018-07-10 | 2018-07-10 | Practice ball device for assisting in judging flapping motion direction |
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| Publication Number | Publication Date |
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| CN108992870A CN108992870A (en) | 2018-12-14 |
| CN108992870B true CN108992870B (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810749066.9A Active CN108992870B (en) | 2018-07-10 | 2018-07-10 | Practice ball device for assisting in judging flapping motion direction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261860Y (en) * | 1996-10-09 | 1997-09-10 | 王文卿 | Luminous inflated ball body |
| CN2675194Y (en) * | 2004-01-12 | 2005-02-02 | 郭玲康 | Golf with light function |
| CN101368681A (en) * | 2007-08-17 | 2009-02-18 | 上海市罗星中学 | Low-voltage parallel beam source generation device |
| CN201643599U (en) * | 2010-02-11 | 2010-11-24 | 雷盾体育用品(上海)有限公司 | Table tennis ball for training |
| EP2363180A2 (en) * | 2007-08-17 | 2011-09-07 | adidas International Marketing B.V. | Sports electronic training system with sport ball, and applications thereof |
| GB2485813A (en) * | 2010-11-25 | 2012-05-30 | David Robinson | A ball with markings to indicate where a user should position their hands |
| CN102743842A (en) * | 2011-04-19 | 2012-10-24 | 耐克国际有限公司 | Data display on golf ball outer surface |
| CN203264253U (en) * | 2013-05-07 | 2013-11-06 | 深圳市舞状元科技有限公司 | Dancing blanket with stage effect light |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7691009B2 (en) * | 2003-09-26 | 2010-04-06 | Radar Golf, Inc. | Apparatuses and methods relating to findable balls |
| US20130316856A1 (en) * | 2012-05-25 | 2013-11-28 | Brian L. Jennings | Training football |
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2018
- 2018-07-10 CN CN201810749066.9A patent/CN108992870B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261860Y (en) * | 1996-10-09 | 1997-09-10 | 王文卿 | Luminous inflated ball body |
| CN2675194Y (en) * | 2004-01-12 | 2005-02-02 | 郭玲康 | Golf with light function |
| CN101368681A (en) * | 2007-08-17 | 2009-02-18 | 上海市罗星中学 | Low-voltage parallel beam source generation device |
| EP2363180A2 (en) * | 2007-08-17 | 2011-09-07 | adidas International Marketing B.V. | Sports electronic training system with sport ball, and applications thereof |
| CN201643599U (en) * | 2010-02-11 | 2010-11-24 | 雷盾体育用品(上海)有限公司 | Table tennis ball for training |
| GB2485813A (en) * | 2010-11-25 | 2012-05-30 | David Robinson | A ball with markings to indicate where a user should position their hands |
| CN102743842A (en) * | 2011-04-19 | 2012-10-24 | 耐克国际有限公司 | Data display on golf ball outer surface |
| CN203264253U (en) * | 2013-05-07 | 2013-11-06 | 深圳市舞状元科技有限公司 | Dancing blanket with stage effect light |
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| CN108992870A (en) | 2018-12-14 |
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Application publication date: 20181214 Assignee: Chongqing Qinlang Technology Co.,Ltd. Assignor: XIANGTAN University Contract record no.: X2024980002576 Denomination of invention: A practice ball device that assists in determining the direction of hitting movement Granted publication date: 20200508 License type: Common License Record date: 20240307 Application publication date: 20181214 Assignee: Yuao Holdings Co.,Ltd. Assignor: XIANGTAN University Contract record no.: X2024980002568 Denomination of invention: A practice ball device that assists in determining the direction of hitting movement Granted publication date: 20200508 License type: Common License Record date: 20240307 |