CN109966721A - A kind of basketball pass, which is received, uses training device - Google Patents
A kind of basketball pass, which is received, uses training device Download PDFInfo
- Publication number
- CN109966721A CN109966721A CN201910299591.XA CN201910299591A CN109966721A CN 109966721 A CN109966721 A CN 109966721A CN 201910299591 A CN201910299591 A CN 201910299591A CN 109966721 A CN109966721 A CN 109966721A
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- service
- temporary storage
- training
- storage cavity
- basketball
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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
- A63B69/00—Training appliances or apparatus for special sports
- A63B69/0071—Training appliances or apparatus for special sports for basketball
-
- 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
- A63B69/40—Stationarily-arranged devices for projecting balls or other bodies
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Housing For Livestock And Birds (AREA)
Abstract
The invention discloses a kind of basketball pass to receive with training device, relates generally to athletic training field.Including training stand, storage ball cabin is equipped in training stand, the side in storage ball cabin is communicated with out bulb, the bottom of bulb is communicated with temporary storage cavity out, it is only capable of accommodating a basketball simultaneously in temporary storage cavity, the upper and lower opening of temporary storage cavity, lifting platform is slidably connected along short transverse in temporary storage cavity, the bottom of lifting platform is equipped with the first driving device of driving lifting of lifting table, the top of temporary storage cavity is equipped with service platform, platform of serving a ball is equipped with ball mouth, ball mouth is connected with temporary storage cavity, service mouth is provided on the side wall of training stand, striking plate is slidably connected on training stand, striking plate is located at the top of service platform, the second driving device that driving striking plate is struck is connected on striking plate.The beneficial effects of the present invention are: it can continuously and automatically serve a ball, and enhance the dynamics of service, keep the randomness in service direction stronger, be conducive to cager's efficient training for a long time.
Description
Technical field
The present invention relates to athletic training field, specifically a kind of basketball pass, which is received, uses training device.
Background technique
In existing basketball training, phase interpass can generally receive between team member, or coach etc. other people serve a ball, team member
It is responsible for pass of receiving, such training method is a very powerful labor intensity to the people of service, and is served a ball for a long time
It will lead to and be short of physical strength, the dynamics and direction transformation for the ball for being connected to team member are all beaten less than trained requirement, and basketball team is unfavorable for
The normal orderly progress of member's training also has and proposes improved training device of receiving of passing for this, can serve a ball automatically, but this
The direction of a little improved device services is single, and service is discontinuous, and the dynamics of service and direction all cannot be guaranteed, and be unfavorable for basketball
Team member carries out effective training for a long time.
Summary of the invention
The purpose of the present invention is to provide a kind of basketball pass to receive with training device, it can continuously and automatically be sent out
Ball enhances the dynamics of service, keeps the randomness in service direction stronger, is conducive to cager's efficient training for a long time.
The present invention to achieve the above object, is achieved through the following technical solutions:
A kind of basketball pass is received with training device, including training stand, is equipped with storage ball cabin, the storage ball in the training stand
The side in cabin is communicated with out bulb, and the bottom of the bulb out is communicated with temporary storage cavity, is only capable of accommodating one simultaneously in the temporary storage cavity
A basketball, the upper and lower opening of the temporary storage cavity, the temporary storage cavity is interior to slidably connect lifting platform, the lifting platform along short transverse
Bottom be equipped with driving lifting of lifting table first driving device；
The top of the temporary storage cavity is equipped with service platform, and the service platform is equipped with ball mouth, the ball mouth and temporary storage cavity
It is connected, service mouth is provided on the side wall of the training stand, is flushed at the top of the bottom of the service mouth and service platform, the instruction
Practice and slidably connect striking plate on frame, the striking plate is located at the top of service platform, and driving batting is connected on the striking plate
The second driving device that plate is struck.
Further, the first driving device includes first motor, turntable, the first fixing axle, first connecting rod, and described
One motor is fixed on the bottom in training stand, and the turntable is fixed on the output shaft of first motor, and first fixing axle is solid
Be scheduled on the position that turntable leans on proximal edge, one end of the first connecting rod is hinged on the bottom of lifting platform, the first connecting rod it is another
Outer one end and the first fixing axle are rotatablely connected.
Further, second driving device include the second motor, first gear, second gear, shaft, fixed link,
Second fixing axle, second connecting rod, second motor are fixed on the side wall of storage ball out of my cabin, and the shaft is rotatably connected on training
On frame, the first gear is fixed in shaft, and the second gear is fixed on the output shaft of the second motor, first tooth
Wheel is engaged with second gear, and the fixed link is fixed on one end of shaft, and the second fixing axle setting is at separate turn of fixed link
One end of axis, one end of the second connecting rod and striking plate are hinged, and the other end of the second connecting rod and the second fixing axle turn
Dynamic connection.
Further, the fixed link is two, and two fixed links are separately fixed at the both ends of shaft.
Further, the monosymmetric of service platform is equipped with baffle.
Further, the service platform is obliquely installed, and the service mouth is close to service lower one end of platform.
Further, the bottom of the training stand is equipped with traveling wheel.
The prior art is compared, the beneficial effects of the present invention are:
1. present invention setting storage ball cabin, temporary storage cavity on training stand, by going out bulb between the storage ball cabin and temporary storage cavity
It is connected, only needs for sufficient amount of basketball to be placed in training in storage ball cabin, the basketball of bottom can be by goes out bulb certainly
It is dynamic to enter in temporary storage cavity, it falls on the lifting platform in temporary storage cavity, the lifting of lifting platform is driven by first driving device, it can be with
Basketball is sent on service platform, is then issued by service mouth, and so on serve a ball, realize basketball continue it is automatic
Service, does not need waste of manpower, greatly reduces the labor intensity of service, and training is enable to continue more long.
It is locating after each basketball enters service platform from ball mouth 2. the temporary storage cavity is only capable of accommodating a basketball simultaneously
Position is all not exactly the same, can there is subtle difference, these differences can become larger after striking plate wherein basketball, leads to basket
Direction when ball is issued from service mouth is full of more randomnesss, keeps the direction change of service more, and dynamics can also generate difference,
The variation of such basketball service is more, is conducive to training of the cager to pass of receiving.
Detailed description of the invention
Attached drawing 1 is schematic perspective view of the invention.
Attached drawing 2 is front view of the invention.
Attached drawing 3 is the cross-sectional view in the direction A in attached drawing 2 of the invention.
Attached drawing 4 is the cross-sectional view in the direction B in attached drawing 3 of the invention.
Attached drawing 5 is inside schematic perspective view of the invention.
Attached drawing 6 is the top view of internal structure of the invention.
Label shown in attached drawing:
1, training stand；2, ball cabin is stored up；3, go out bulb；4, temporary storage cavity；5, lifting platform；6, service platform；7, ball mouth；8, it serves a ball
Mouthful；9, striking plate；10, first motor；11, turntable；12, the first fixing axle；13, first connecting rod；14, the second motor；15, first
Gear；16, second gear；17, shaft；18, fixed link；19, the second fixing axle；20, second connecting rod；21, baffle；22, it walks
Wheel.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within range defined herein.
Of the present invention is that a kind of basketball pass is received with training device, and main structure includes training stand 1, the training stand
1 is a rectangular box, and the top opening of the training stand 1, opening setting cover board, the training stand 1 is interior to be equipped with storage ball cabin
2, the storage ball cabin 2 passes through bolt or is weldingly fixed on the inside of training stand 1, and the storage ball cabin 2 is used to store training
Basketball, use by multiple basketballs be placed on storage ball cabin 2 it is spare, it is described storage ball cabin 2 side be communicated with out bulb 3, specifically
It is described go out bulb 3 be provided on bottom or the one side that is connected with bottom in storage ball cabin 2, most basketball can be made to weigh
Into bulb 3 is gone out under the action of power, the bulb 3 out is obliquely installed, and top is connected with storage ball cabin 2, the bulb 3 out
Pipe diameter size can guarantee on the cross section of bulb 3 out in this way between the diameter of one or two basketball while only exist one
The bottom of a basketball, the bulb 3 out is communicated with temporary storage cavity 4, and the temporary storage cavity 4 is fixed on training stand by welding or bolt
On side wall in 1, the temporary storage cavity 4 is used for temporary storage basketball, and basketball enters temporary storage cavity along bulb 3 out from storage ball cabin 2
4, be only capable of accommodating a basketball simultaneously in the temporary storage cavity 4, the size of temporary storage cavity 4 between one or two basketball diameter, this
The setting of sample can make only to exist simultaneously a basketball in temporary storage cavity 4, and subsequent basketball is stand-by in bulb 3 out, only when temporary
The basketball that basketball in chamber 4 goes out in bulb 3 after issuing just will continue to fall in temporary storage cavity 4, guarantee only to emit a basketball every time,
The upper and lower opening of the temporary storage cavity 4, the temporary storage cavity 4 is interior to slidably connect lifting platform 5 along short transverse, specifically in temporary storage cavity
Sliding slot is set on 4 inner sidewall, sliding block is set on the side wall of the lifting platform 5, the sliding block is slidably connected in sliding slot and realizes
The height size of oscilaltion of the lifting platform 5 in temporary storage cavity 4, the lifting platform 5 itself will guarantee the bottom of lifting platform 5 always
Lower section in bulb 3 out, the top of lifting platform 5 can reach the top open part of temporary storage cavity 4, and a side is arranged in such size
Face can be such that the basketball gone out in bulb 3 in the lifting process of lifting platform 5 does not fall into temporary storage cavity 4, and only lifting platform 5 is located at most
Basketball just enters temporary storage cavity 4 when lower, and the top that the basketball on lifting platform 5 on the other hand can be allow to reach temporary storage cavity 4 is opened
At mouthful, hence into the subsequent service stage, the bottom of the lifting platform 5 is equipped with the first driving dress that driving lifting platform 5 is gone up and down
Set, the first driving device can drive lifting platform to be gone up and down, and then make basketball one by one sequentially enter temporary storage cavity 4
It is interior, it is then successively sent out out of temporary storage cavity 4 by lifting platform 5, into the subsequent service stage, service can be made successively to carry out, protected
The secondary sequence for demonstrate,proving service, is conducive to the orderly efficient training of cager；
The top of the temporary storage cavity 4 is equipped with service platform 6, and the sidewall weld or bolt of the service platform 6 and training stand 1 are solid
Fixed, the service platform 6 is equipped with ball mouth 7, and the ball mouth 7 is connected with temporary storage cavity 4, the size of the ball mouth 7 with it is temporary
The top opening size for depositing chamber 4 is identical, guarantees that service platform 6 can be entered from ball mouth 7 after basketball is sent out of temporary storage cavity 4,
Service mouth 8 is provided on the side wall of the training stand 1, the bottom of the service mouth 8 is flushed with the top of service platform 6, can make basket
It is smoothly issued along service mouth 8 on the spontaneous billiard table 6 of ball, slidably connects striking plate 9 on the training stand 1, the specific training
Sliding rail or slideway are provided on frame 1, the striking plate 9 is vertically arranged, and both ends are slidably connected on sliding rail or slideway, can be with
Making striking plate 9 along sliding rail, perhaps the sliding of slideway level is to achieve the purpose that continuous opposite service mouth 8 is close or separate, institute
The top that striking plate 9 is located at service platform 6 is stated, the basketball on service platform 6 can be struck, the power of service is provided, it is described
The second driving device that driving striking plate 9 is struck is connected on striking plate 9, second driving device can be constant
Driving striking plate 9 along sliding rail or slideway linear reciprocating motion, with the power to the basketball on each service platform 6 to serve a ball,
Because the bottom size of temporary storage cavity 4, between one or two basketball diameter, basketball enters service platform from ball mouth 7
All there is tiny difference in the position after 6, such difference becomes larger after basketball is by the impact campaign of striking plate 9, arrives
The dynamics and angle of each basketball transmitting are varied when at up to service mouth 8, the basketball that cager each in this way is connected to
Direction and dynamics are all different, are repeated continuously biography and connect such basketball and help to receive to pass and are effectively trained, described
First driving device is matched with the revolving speed of the second driving device, guarantees that lifting platform 5 is rising to when highest point the striking plate 9 just
The position for reaching ball mouth 7 well strikes basketball.
Preferably, the first driving device includes first motor 10, turntable 11, the first fixing axle 12, first connecting rod 13,
10 bolt of first motor is fixed on the bottom in training stand 1, passes through bolt at the center of the turntable 11 or welding is solid
It is scheduled on the output shaft of first motor 10, the plane of rotor disc of the turntable 11 is at vertical direction, the rotation of the first motor 10
Can drive turntable 11 along the center of circle rotate, first fixing axle 12 be fixed on turntable 11 lean on proximal edge position, described first
One end of connecting rod 13 is hinged on the bottom of lifting platform 5 by articulated shaft, and the other end of the first connecting rod 13 is fixed with first
Axis 12 is rotatablely connected by bearing, drives the first fixing axle 12 to rotate around the center of circle of turntable 11 when the turntable 11 rotation,
Height where first fixing axle 12 back and forth changes between highs and lows, drives the height of the first connecting rod 13
Degree constantly variation, makes the oscilaltion in temporary storage cavity 4 of lifting platform 5, when the first fixing axle 12 is in the highest point of turntable 11
When, the top of the lifting platform 5 reaches the top open part of temporary storage cavity 4, and the bottom of the lifting platform 5 is lower than the bottom for going out bulb 3
Portion guarantees that the basketball gone out in bulb 3 during lifting platform 5 is gone up and down is stopped by lifting platform 5 without falling into temporary storage cavity 4,
With the continuous rotation of turntable 11, the lifting platform 5 up and down motion reciprocal in temporary storage cavity 4, not by the basketball on lifting platform 5
It is sent on service platform 6 disconnectedly, uses more efficient, effect is more preferable.
Preferably, second driving device includes the second motor 14, first gear 15, second gear 16, shaft 17, consolidates
Fixed pole 18, the second fixing axle 19, second connecting rod 20, second motor 14 are fixed or are welded by motor mounting rack bolt solid
It is scheduled on the side wall outside storage ball cabin 2, the shaft 17 is rotatably connected on training stand 1 by bearing, and the first gear 15 is welded
It connects and is fixed in shaft 17, the second gear 16 is weldingly fixed on the output shaft of the second motor 14, the first gear 15
Engaged with second gear 16, can drive the rotation of shaft 17 by the rotation of the second motor 14, the welding of fixed link 18 or
Person's bolt is fixed on one end of shaft 17, and the welding of the second fixing axle 19 or bolt are fixed on fixed link 18 far from shaft 17
One end, one end of the second connecting rod 20 and striking plate 9 are hinged by articulated shaft, the other end of the second connecting rod 20 with
Second fixing axle 19 is rotatablely connected by bearing, when shaft 17 rotates, drives the second fixing axle 19 in the fixed link 18
Axis along shaft 17 rotates, and the horizontal distance of the fixed link 18 shaft 17 opposite with the hinged one end of striking plate 9 constantly becomes
Change, and then striking plate 9 is pushed to do reciprocal close or separate movement with respect to ball mouth 7, i.e., it is sustainable duplicate to service platform 6
On basketball struck.
Preferably, the fixed link 18 is two, and two fixed links 18 are respectively welded or bolt is fixed on shaft 17
Both ends, the corresponding fixed link 18, the second fixing axle 19, second connecting rod 20 are two, and such setting can make pair
The driving of striking plate 9 is more stable, slides striking plate 9 along training stand 1 more stable and accurate, in the fortune of striking plate 9
It will not shift in dynamic process, guarantee to provide sufficiently exact impact force to basketball.
Preferably, the monosymmetric of the service platform 6 is equipped with baffle 21, and the baffle 21 is the elastic plate of arc shape,
The baffle 21 is bent to the direction of service mouth 8, can generate the impact force of elasticity to basketball when basketball touches baffle 21,
Increase the dynamics of basketball service, and the motion profile of basketball is made to maintain the direction of service mouth 8, keeps service more accurate.
Preferably, the service platform 6 is obliquely installed, and the service mouth 8 is close to service lower one end of platform 6, the ball out
The vertical position of mouth 7 is higher than service mouth 8, and such basketball keeps in mind the service fortune of mouth 8 under gravity after coming out from ball mouth 7
It is dynamic, the dynamics of service is further increased, keeps the training strength of service higher.
Preferably, the bottom of the training stand 1 is equipped with traveling wheel 22, facilitates the position of adjusting training frame 1, adapts it to
Property is stronger.
Working principle: before training, multiple basketballs are placed in storage ball cabin 2, basketball enters under gravity
Bulb 3 out enter in temporary storage cavity 4 from bulb 3 out, are only capable of accommodating a basketball simultaneously in temporary storage cavity 4, subsequent basketball is by front
Basketball be blocked in out spare in bulb 3, while starting first driving device, the second driving device, the first driving device
It is matched with the revolving speed of the second driving device, the lifting platform 5 rises under the driving of first driving device, by basketball thereon
Service platform 6 is sent into from ball mouth 7, the striking plate 9 hits basketball along training stand 1 under the driving of the second driving device
It beats, initial position is returned to after the completion of impact, the basketball moves under the impact of striking plate 9 towards the direction of service mouth 8, from hair
Ball mouth 8 issues, and cager receives from the direction outside service mouth 8, under then lifting platform 5 is under the driving of first driving device
Drop, the basketball in bulb 3 enters on the lifting platform 5 in temporary storage cavity 4 out, then repeats the above process, because of the size of temporary storage cavity 4
Greater than the size of a basketball, therefore position after each basketball enters service platform 6 from ball mouth 7 is there are tiny difference,
Such difference becomes larger after basketball is by the impact campaign of striking plate 9, each basketball transmitting when reaching at service mouth 8
Dynamics and angle are all varied, and the direction for the basketball that cager each in this way is connected to and dynamics are different, are repeated continuously
Biography, which connects such basketball and helps to receive to pass, is effectively trained, and is not needed additional personnel's training mate, is reduced labour
Intensity keeps training more efficient.
Claims (7)
1. a kind of basketball pass is received with training device, it is characterised in that:
Including training stand (1), storage ball cabin (2) is equipped in the training stand (1), the side of storage ball cabin (2) is communicated with out ball
It manages (3), the bottom of bulb (3) out is communicated with temporary storage cavity (4), it is only capable of accommodating a basketball simultaneously in the temporary storage cavity (4),
The upper and lower opening of the temporary storage cavity (4), the temporary storage cavity (4) is interior to slidably connect lifting platform (5), the lifting along short transverse
The bottom of platform (5) is equipped with the first driving device of driving lifting platform (5) lifting；
The top of the temporary storage cavity (4) is equipped with service platform (6), and the service platform (6) is equipped with ball mouth (7), the ball mouth
(7) be connected with temporary storage cavity (4), be provided on the side wall of the training stand (1) service mouth (8), it is described service mouth (8) bottom with
It flushes at the top of service platform (6), is slidably connected striking plate (9) on the training stand (1), the striking plate (9) is located at service
The top of platform (6) is connected with the second driving device that driving striking plate (9) is struck on the striking plate (9).
2. a kind of basketball pass is received with training device according to claim 1, it is characterised in that:
The first driving device includes first motor (10), turntable (11), the first fixing axle (12), first connecting rod (13), institute
The bottom that first motor (10) is fixed in training stand (1) is stated, the turntable (11) is fixed on the output shaft of first motor (10)
On, first fixing axle (12) is fixed on the position that turntable (11) lean on proximal edge, and one end of the first connecting rod (13) is hinged
In the bottom of lifting platform (5), the other end of the first connecting rod (13) and the first fixing axle (12) are rotatablely connected.
3. a kind of basketball pass is received with training device according to claim 1, it is characterised in that:
Second driving device includes the second motor (14), first gear (15), second gear (16), shaft (17), fixes
Bar (18), the second fixing axle (19), second connecting rod (20), second motor (14) are fixed on the side wall of storage ball cabin (2) outside,
The shaft (17) is rotatably connected on training stand (1), and the first gear (15) is fixed on shaft (17), second tooth
Wheel (16) is fixed on the output shaft of the second motor (14), and the first gear (15) is engaged with second gear (16), described solid
Fixed pole (18) is fixed on one end of shaft (17), and the second fixing axle (19) setting is in fixed link (18) far from shaft (17)
One end, hingedly, the other end of the second connecting rod (20) is solid with second for one end and striking plate (9) of the second connecting rod (20)
Dead axle (19) rotation connection.
4. a kind of basketball pass is received with training device according to claim 3, it is characterised in that:
The fixed link (18) is two, and two fixed links (18) are separately fixed at the both ends of shaft (17).
5. a kind of basketball pass is received with training device according to claim 1, it is characterised in that: service platform (6)
It is monosymmetric to be equipped with baffle (21).
6. a kind of basketball pass is received with training device according to claim 1, it is characterised in that: the service platform (6) is inclined
Tiltedly setting, the service mouth (8) is close to service platform (6) lower one end.
7. a kind of basketball pass is received with training device according to claim 1, it is characterised in that: the training stand (1)
Bottom be equipped with traveling wheel (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299591.XA CN109966721A (en) | 2019-04-15 | 2019-04-15 | A kind of basketball pass, which is received, uses training device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299591.XA CN109966721A (en) | 2019-04-15 | 2019-04-15 | A kind of basketball pass, which is received, uses training device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109966721A true CN109966721A (en) | 2019-07-05 |
Family
ID=67084627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910299591.XA Pending CN109966721A (en) | 2019-04-15 | 2019-04-15 | A kind of basketball pass, which is received, uses training device |
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| Country | Link |
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| CN (1) | CN109966721A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548557A (en) * | 2015-01-16 | 2015-04-29 | 上海海事大学 | Automatic serving device and automatic serving method for basketball |
| CN204380206U (en) * | 2015-02-06 | 2015-06-10 | 泰山医学院 | A kind of ball hello ball device |
| CN106621259A (en) * | 2017-01-23 | 2017-05-10 | 许昌学院 | Volleyball training device |
| JP3217166U (en) * | 2018-02-15 | 2018-07-26 | 本多 正治 | Tennis practice device integrating ball launcher and recovery machine |
| CN108553864A (en) * | 2018-03-09 | 2018-09-21 | 南安市创培电子科技有限公司 | A kind of basketball shooting training basketball apparatus for placing |
| CN109045656A (en) * | 2018-10-17 | 2018-12-21 | 张家林 | A kind of tennis service device |
-
2019
- 2019-04-15 CN CN201910299591.XA patent/CN109966721A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548557A (en) * | 2015-01-16 | 2015-04-29 | 上海海事大学 | Automatic serving device and automatic serving method for basketball |
| CN204380206U (en) * | 2015-02-06 | 2015-06-10 | 泰山医学院 | A kind of ball hello ball device |
| CN106621259A (en) * | 2017-01-23 | 2017-05-10 | 许昌学院 | Volleyball training device |
| JP3217166U (en) * | 2018-02-15 | 2018-07-26 | 本多 正治 | Tennis practice device integrating ball launcher and recovery machine |
| CN108553864A (en) * | 2018-03-09 | 2018-09-21 | 南安市创培电子科技有限公司 | A kind of basketball shooting training basketball apparatus for placing |
| CN109045656A (en) * | 2018-10-17 | 2018-12-21 | 张家林 | A kind of tennis service device |
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Application publication date: 20190705 |