CN211410926U - Tennis fixed point swing training device - Google Patents

Tennis fixed point swing training device Download PDF

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Publication number
CN211410926U
CN211410926U CN201922351815.5U CN201922351815U CN211410926U CN 211410926 U CN211410926 U CN 211410926U CN 201922351815 U CN201922351815 U CN 201922351815U CN 211410926 U CN211410926 U CN 211410926U
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China
Prior art keywords
tennis
ball
ball feeding
sliding block
supporting
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Expired - Fee Related
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CN201922351815.5U
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Chinese (zh)
Inventor
何心秋
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Individual
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Individual
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Priority to CN201922351815.5U priority Critical patent/CN211410926U/en
Application granted granted Critical
Publication of CN211410926U publication Critical patent/CN211410926U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a tennis fixed-point swing training device, which comprises a lifting adjusting part, wherein a supporting rod is vertically arranged at the top of the lifting adjusting part, a ball inlet passage is wound on the supporting rod, a supporting seat is obliquely arranged on the lifting adjusting part, a ball feeding guide pipeline and a guide arm are arranged on the supporting seat, a sliding block and a chain driving mechanism are arranged on the guide arm, the chain driving mechanism drives the sliding block to move up and down on the guide arm, the top of the sliding block is hinged with an elastic ball pushing piece, the side wall of the sliding block is provided with a tennis supporting plate, the ball feeding guide pipeline comprises a first ball feeding plate with an arc-shaped cross section and a second ball feeding plate with an arc-shaped cross section, the top parts of the first ball feeding plate and the second ball feeding plate are connected through an arc-shaped connecting plate, a ball outlet of the ball inlet passage is aligned with the bottom of the first ball feeding plate, the utility model discloses can train tennis's the action of waving better.

Description

Tennis fixed point swing training device
Technical Field
The utility model relates to the technical field of sports equipment, especially a tennis fixed point is waved and is clapped trainer.
Background
Along with the continuous improvement of people's standard of living, more and more people realize the importance that possesses good physical quality, just strengthen various sports and take exercise slowly, consequently various ball sports articles for use have more and more wide markets, under the background of tennis vigorous development, more and more people begin to like this sports, not only have professional training team member also have many amateur fan to carry out tennis training at ordinary times, in order to alleviate the training person ball, just one person just can follow exerciser service robot to practice relatively and pick up the ball, effectively improve the competition level, reach the exercise purpose. However, in the existing tennis fixed-point trainer, only one upright is provided with a supporting arm which is made of elastic material, and an elastic ball is arranged on the supporting arm; this kind of traditional training ware, not only hardly carry out the training of waving of various angles, can't play the elastic ball moreover, just so do not know to wave whether the posture of clapping is correct, and the training need play the tennis promptly normally, just knows oneself and waves dynamics, angle, the posture of clapping and whether correct, will observe the condition of falling to the ground of tennis after playing, just can adjust oneself and wave the posture better.
Disclosure of Invention
In order to overcome the problems, the utility model aims to provide a tennis fixed point swing training device, which can better train tennis swing actions and can observe the landing condition of tennis after swing.
The utility model discloses a following scheme realizes: a tennis fixed-point swing training device comprises a lifting adjusting portion, wherein a supporting rod is vertically arranged at the top of the lifting adjusting portion, a ball feeding channel is wound on the supporting rod, a supporting seat is obliquely arranged on the lifting adjusting portion, a ball feeding guide pipeline and a guide arm are arranged on the supporting seat, the ball feeding guide pipeline and the guide arm are arranged in front of and behind, a sliding block and a chain driving mechanism are arranged on the guide arm, the sliding block is driven by the chain driving mechanism to move up and down on the guide arm, an elastic ball pushing piece is hinged to the top of the sliding block, a tennis supporting plate is arranged on the side wall of the sliding block, the ball feeding guide pipeline comprises a first ball feeding plate with an arc-shaped cross section and a second ball feeding plate with an arc-shaped cross section, and the tops of the first ball feeding plate and the second ball feeding plate are connected through an arc-shaped connecting plate, the tennis ball pushing device comprises a first tennis ball feeding plate, a sliding block, an elastic tennis ball pushing piece, a tennis ball pushing piece and a tennis ball pushing piece, wherein a ball outlet of the tennis ball feeding channel is aligned with the bottom of a channel of the first tennis ball feeding plate, the sliding block moves downwards on a guide arm, the tennis ball supporting plate can be just positioned in the channel of the first tennis ball feeding plate, the sliding block moves upwards on the guide arm, the elastic tennis ball pushing piece can be just positioned in the channel of the second tennis ball feeding plate, and the tennis ball supporting plate and the elastic tennis ball pushing piece can respectively lift tennis balls in the channel of the first tennis ball feeding plate and tennis balls at the top of the channel of the second tennis ball.
Furthermore, a controller is arranged on the back of the guide arm, a first contact switch is arranged at the top of the guide arm, a second contact switch is arranged at the bottom of a channel of the first ball feeding plate, a third contact switch is arranged at the bottom of the supporting seat, the third contact switch is positioned between the ball feeding guide pipeline and the guide arm, and the third contact switch corresponds to the sliding block; the first contact switch, the second contact switch, the third contact switch and a driving motor of the chain driving mechanism are all connected with the controller; after the elastic ball ejecting piece is contacted with the first contact switch, the controller starts the driving motor, the driving motor drives the sliding block on the chain to move downwards, after the sliding block touches the third contact switch, the controller closes the driving motor, after tennis enters the first ball feeding plate channel from the ball inlet channel and touches the second contact switch, the controller starts the driving motor, and the driving motor drives the sliding block on the chain to move upwards.
Furthermore, the lifting adjusting part comprises a hollow frame body and a box body, an electric push rod is arranged in the hollow frame body, the box body is nested in the hollow frame body, the electric push rod is connected with the bottom of the box body, a bottom plate is arranged at the top of the box body, and the supporting rod and the supporting seat are arranged on the bottom plate.
Further, two strip-shaped guide grooves are formed in the front side face and the rear side face of the box body, two strip-shaped guide columns are arranged on the front inner side wall and the rear inner side wall of the hollow frame body, and the strip-shaped guide columns are located in the strip-shaped guide grooves.
Further, the chain driving mechanism comprises a driving motor, a first gear, a second gear, a chain, an upper positioning seat, a lower positioning seat and a guide rod; the drive motor and the lower positioning seat are arranged on the supporting seat side by side, the first gear and the upper positioning seat are arranged on the guide arm side by side, the second gear is arranged on a rotating shaft of the drive motor, the chain is arranged between the first gear and the second gear, the guide rod is fixed between the upper positioning seat and the lower positioning seat, the sliding block is sleeved on the guide rod, the sliding block is connected with the chain, and the chain can drive the sliding block to move up and down on the guide rod.
Furthermore, the elastic ball-ejecting piece comprises a hinge part and a support piece, the hinge part is arranged on the sliding block, the support piece is connected with the hinge part, a support column is arranged on the support piece, an elastic piece is connected onto the support column, and a fixing ring for placing a tennis ball is arranged on the elastic piece.
Further, the elastic piece is an elastic steel wire rope.
Furthermore, an opening is formed in the bottom of the first ball feeding plate, an elastic ejector rod is arranged on the supporting seat and penetrates through the opening, and the elastic ejector rod faces a ball outlet of the ball inlet channel.
Further, a battery is arranged in the box body and provides power for the controller and the driving motor.
Furthermore, the goal lane is spiral.
The beneficial effects of the utility model reside in that: the utility model can put a plurality of tennis balls into the ball inlet channel at one time, after the tennis balls fall into the channel of the first ball feeding plate, the sliding block drives the tennis supporting plate and the elastic ball jacking piece to perform rising motion, when the tennis supporting plate rises, the tennis supporting plate jacks up the tennis ball II in the channel of the first ball feeding plate, and the elastic ball jacking piece jacks up the tennis ball I at the top of the channel of the second ball feeding plate; therefore, the first ball feeding plate and the second ball feeding plate are obliquely arranged, so that a tennis second on the first ball feeding plate can slide to the top of the second ball feeding plate along with the arc-shaped connecting plate, after the tennis first is arranged on the elastic ball supporting piece, a tennis player can perform a swing operation, after the swing, the elastic ball supporting piece touches the first contact switch, the elastic ball supporting piece resets, the driving motor drives the sliding block to move downwards, the tennis supporting plate supports a tennis third ball, the elastic ball supporting piece supports the tennis second ball, the swing operation is repeated, the tennis is automatically supported to perform fixed-point swing training, the swing action of the tennis can be better trained, the falling condition of the swung tennis can be observed, and the player can know whether the swing strength, angle and posture are correct or not, so that the swing posture of the player can be better adjusted.
Drawings
Fig. 1 is a schematic structural diagram of a first usage state of the present invention.
Fig. 2 is a schematic structural diagram of the second usage state of the present invention.
Fig. 3 is a schematic structural view of the ball feeding guide pipeline and the guide arm of the present invention disposed on the support seat.
Fig. 4 is an inner side view of the guide arm of the present invention disposed on the supporting seat.
Fig. 5 is a schematic structural view of the ball feeding guide pipeline of the present invention disposed on the supporting seat.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 to 5, a fixed-point swing training device for tennis balls of the present invention is shown in fig. 1 and 2, and includes a lifting adjusting portion 1, a supporting rod 2 is vertically disposed on the top of the lifting adjusting portion 1, a goal lane 3 is wound on the supporting rod 2, a supporting seat 4 is further obliquely disposed on the lifting adjusting portion 1, and the lifting adjusting portion can adjust the height of the whole device, so that the device can adapt to tennis players with different heights to swing the racket; as shown in fig. 3, a ball feeding guide duct 5 and a guide arm 6 are arranged on the support seat 4, the ball feeding guide duct 5 and the guide arm 6 are arranged in front of and behind each other, a sliding block 7 and a chain driving mechanism 8 are arranged on the guide arm 6, the chain driving mechanism 8 drives the sliding block 7 to move up and down on the guide arm 6, an elastic ball ejecting member 9 is hinged to the top of the sliding block 7, and the elastic ball ejecting member 9 can eject a tennis ball at the top of the second ball feeding plate channel, so that the tennis player can practice the racket training after the tennis ball is placed at a certain height; a tennis supporting plate 10 is arranged on the side wall of the sliding block 7, and the tennis supporting plate 10 can support tennis balls in the first tennis feeding plate channel; as shown in fig. 5, the ball feeding guide duct 5 comprises a first ball feeding plate 51 with an arc-shaped cross section and a second ball feeding plate 52 with an arc-shaped cross section, the tops of the first ball feeding plate 51 and the second ball feeding plate 52 are connected by an arc-shaped connecting plate 53, the ball outlet 31 of the ball feeding duct 3 is aligned with the bottom of the channel of the first ball feeding plate 51, the ball bearing plate 10 can be just positioned in the channel of the first ball feeding plate 51 when the sliding block 7 moves downwards on the guide arm 6, the elastic ball jacking member 9 can be just positioned in the channel of the second ball feeding plate 52 when the sliding block 7 moves upwards on the guide arm 6, and the ball bearing plate 10 and the elastic ball jacking member 9 can respectively jack up a ball in the channel of the first ball feeding plate 51 and a ball at the top of the channel of the second ball feeding plate 52 as the sliding block 7 moves upwards, because the first ball feeding plate 51 and the second ball feeding plate 52 are obliquely arranged (see fig. 3), when the first ball feeding plate is obliquely arranged, the top of the first ball feeding plate is higher than that of the second ball feeding plate, so that after the tennis ball in the first ball feeding plate is supported to the top of the first ball feeding plate by the tennis ball supporting plate, the tennis ball can slide to the top of the second ball feeding plate from the arc connecting plate 53 due to the gravity of the tennis ball supporting plate; the tennis ball on the top of the second ball feeding plate is jacked up by the elastic ball jacking piece 9, so that a tennis player can hit the jacked tennis ball, and the tennis ball in the ball inlet channel automatically falls on the top of the second ball feeding plate to prepare for next hitting.
In the present invention, a controller 61 is disposed on the back of the guide arm 6, a first contact switch 62 is disposed on the top of the guide arm 6, a second contact switch 63 is disposed on the bottom of the channel of the first ball feeding plate, a third contact switch 64 is disposed on the bottom of the support seat, the third contact switch 64 is located between the ball feeding guide pipe 5 and the guide arm 6, and the third contact switch 64 corresponds to the position of the sliding block 7; the first contact switch 62, the second contact switch 63, the third contact switch 64 and the driving motor 81 of the chain driving mechanism 8 are all connected with the controller 61; after the elastic ball ejecting piece 9 is contacted with the first contact switch 62, the controller 61 starts the driving motor 81, the driving motor 81 drives the sliding block 7 on the chain to move downwards, after the sliding block 7 touches the third contact switch 64, the controller 61 closes the driving motor, after tennis enters the first ball feeding plate 51 channel from the ball inlet channel and touches the second contact switch 63, the controller 61 starts the driving motor, and the driving motor drives the sliding block 7 on the chain to move upwards; the controller adopts stm32 series processors, and can be processors of other models in practical application; the controller, the first contact switch, the second contact switch and the third contact switch can well control the forward rotation and the reverse rotation of the driving motor and the running stopping time, thereby realizing the ball supporting operation of the tennis supporting plate 10 and the ball ejecting operation of the elastic ball ejecting piece 9.
The lifting adjusting part 1 comprises a hollow frame body 11 and a box body 12, an electric push rod 13 is arranged in the hollow frame body 11, the box body 12 is nested in the hollow frame body 11, the electric push rod 13 is connected with the bottom of the box body 12, a bottom plate 14 is arranged at the top of the box body 12, and the supporting rod 2 and the supporting seat 4 are arranged on the bottom plate 14. The model of the electric push rod is SXL LA 001. Therefore, the electric push rod can push the box body to lift up and down in the hollow frame.
In order to enable the box body to be capable of lifting up and down in the hollow frame body 11 better, two strip-shaped guide grooves 121 are formed in the front side surface and the rear side surface of the box body 12, two strip-shaped guide columns (not shown) are arranged on the front inner side wall and the rear inner side wall of the hollow frame body, and the strip-shaped guide columns are located in the strip-shaped guide grooves 121.
As shown in fig. 4, the chain driving mechanism 8 includes a driving motor 81, a first gear 82, a second gear 83, a chain 84, an upper positioning seat 85, a lower positioning seat 86, and a guide rod 87; drive motor 81 and lower positioning seat 86 set up side by side on supporting seat 4, first gear 82 and last positioning seat 85 set up side by side on guide arm 6, second gear 83 sets up in drive motor 81's pivot, chain 84 set up in between first gear 82 and the second gear 83, guide bar 87 is fixed in between last positioning seat 85 and the lower positioning seat 86, sliding block 7 cover on guide bar 87, sliding block 7 with chain 84 connects, chain 84 can drive sliding block 7 and reciprocate at guide bar 87. This sliding block can be through a connecting rod and chain fixed connection, and when driving motor drive chain moved like this, the chain can drive the sliding block and move on guide bar 87.
The elastic ball-ejecting member 9 includes a hinge portion 91 and a supporting sheet 92, the hinge portion 91 is disposed on the sliding block 7, the supporting sheet 92 is connected to the hinge portion 91, a supporting post 93 is disposed on the supporting sheet 92, an elastic member 94 is connected to the supporting post 93, a fixing ring 95 for placing a tennis ball is disposed on the elastic member 94, wherein there are at least two supporting posts, and preferably three supporting posts. Preferably, the elastic member 94 is an elastic steel wire rope. Therefore, when a tennis player swings to beat and hit tennis on the elastic piece, the swinging effect of the tennis player cannot be influenced, and the elastic piece cannot be damaged.
An opening 511 is formed at the bottom of the first ball feeding plate 51, an elastic ejector rod 15 is arranged on the support seat 4, the elastic ejector rod 15 penetrates through the opening 511, and the elastic ejector rod 15 faces the ball outlet of the ball inlet lane 3. The elastic ejector rod 15 is used for limiting a plurality of tennis balls in the goal lane to roll onto the first ball feeding plate 51 at the same time, only after the tennis ball supporting plate 10 presses down the elastic ejector rod 15, the tennis balls in the goal lane can roll onto the tennis ball supporting plate in the first ball feeding plate channel, at this time, the tennis balls touch the second contact switch, the controller can control the driving motor to lift the sliding block, at this time, the tennis ball supporting plate does not press the elastic ejector rod any more, the elastic ejector rod performs reset operation, the tennis balls in the goal lane are limited to roll onto the first ball feeding plate 51, a battery (not shown in the figure) is arranged in the box body 12, and the battery provides power for the controller and the driving motor.
Wherein, the goal lane 3 is spiral; therefore, a plurality of tennis balls can be buffered in the spiral goal lane, so that a player can swing a plurality of tennis balls at one time without picking up the tennis balls all the time.
The working principle of the utility model is as follows: first, a first tennis ball 16 is placed at the top of the channel of the second ball feeding plate 52, a plurality of tennis balls are placed in the ball inlet channel 3, the elastic element on the elastic ball ejecting element 9 is firstly contacted with the first contact switch for the first time, at the moment, the controller 61 starts the driving motor 81, the driving motor 81 drives the sliding block 7 on the chain to move downwards, at the moment, the elastic ball ejecting element 9 is positioned in the channel of the second ball feeding plate 52 and moves downwards, the elastic ball ejecting element 9 is positioned below the first tennis ball 16, after the sliding block 7 is contacted with the third contact switch 64, the driving motor is closed by the controller 61, after the elastic ejector rod 15 is pressed by the tennis supporting plate 10, the second tennis ball 17 in the ball inlet channel rolls into the tennis ball supporting plate positioned in the channel of the first ball feeding plate, at the moment, the second tennis ball 17 is contacted with the second contact switch, the controller controls the driving motor to lift the sliding block, at the moment, the tennis supporting plate is not pressed by the elastic ejector rod, the elastic mandril performs reset operation to limit the tennis balls in the goal lane from rolling onto the first ball feeding plate 51; after the sliding block is lifted, the tennis ball supporting plate 10 will slowly support the second tennis ball 17 in the first ball feeding plate channel, meanwhile, the elastic ball jacking piece 9 will jack up the first tennis ball 16 positioned at the top of the second ball feeding plate 52 channel, and after the sliding block is lifted again, the tennis ball supporting plate 10 will support the second tennis ball 17 to the top of the first ball feeding plate channel (it should be noted here that the tennis ball supporting plate is only used to assist the tennis ball to be lifted in the first ball feeding plate channel, and after the tennis ball supporting plate reaches a certain height, the tennis ball supporting plate will leave the first ball feeding plate channel, and the tennis ball supporting plate will not continue to support the tennis ball), and the second tennis ball will slide down to the top of the second ball feeding plate channel from the arc-shaped connecting plate 53 due to its own gravity; and the first tennis ball on the top of the second ball feeding plate is jacked up by the elastic ball jacking piece 9 in advance, so that a tennis player can hit the jacked first tennis ball, after hitting, the first tennis ball is touched by the elastic ball jacking piece 9, the first contact switch is touched, the operations are repeated, the tennis ball is automatically held up to perform fixed-point swing training, the device can better train the swing action of tennis, and the falling condition of the tennis ball after swing can be observed, so that the player can know whether the swing strength, angle and posture are correct, and can better adjust the swing posture of the player.
The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.

Claims (10)

1. The utility model provides a tennis fixed point is swung and is clapped trainer which characterized in that: the device comprises a lifting adjusting part, a supporting rod is vertically arranged at the top of the lifting adjusting part, a ball feeding channel is wound on the supporting rod, a supporting seat is obliquely arranged on the lifting adjusting part, a ball feeding guide pipeline and a guide arm are arranged on the supporting seat, the ball feeding guide pipeline and the guide arm are arranged in front and back, a sliding block and a chain driving mechanism are arranged on the guide arm, the chain driving mechanism drives the sliding block to move up and down on the guide arm, an elastic ball pushing piece is hinged to the top of the sliding block, a tennis supporting plate is arranged on the side wall of the sliding block, the ball feeding guide pipeline comprises a first ball feeding plate with an arc-shaped cross section and a second ball feeding plate with an arc-shaped cross section, the top parts of the first ball feeding plate and the second ball feeding plate are connected through an arc-shaped connecting plate, a ball outlet of the ball feeding channel is aligned with the bottom of a channel of the first ball feeding plate, when the sliding block moves downwards on the guide arm, the tennis supporting plate can be just positioned in the channel of the first ball feeding plate, when the sliding block moves upwards on the guide arm, the elastic ball ejecting piece can be just positioned in the channel of the second ball feeding plate, and the tennis supporting plate and the elastic ball ejecting piece can respectively lift the tennis balls in the channels of the first ball feeding plate and lift the tennis balls at the top of the channels of the second ball feeding plate along with the rising of the sliding block.
2. The tennis fixed-point swing training device of claim 1, wherein: the back of the guide arm is provided with a controller, the top of the guide arm is provided with a first contact switch, the bottom of a channel of the first ball feeding plate is provided with a second contact switch, the bottom of the support seat is provided with a third contact switch, the third contact switch is positioned between the ball feeding guide pipeline and the guide arm, and the third contact switch corresponds to the sliding block; the first contact switch, the second contact switch, the third contact switch and a driving motor of the chain driving mechanism are all connected with the controller; after the elastic ball ejecting piece is contacted with the first contact switch, the controller starts the driving motor, the driving motor drives the sliding block on the chain to move downwards, after the sliding block touches the third contact switch, the controller closes the driving motor, after tennis enters the first ball feeding plate channel from the ball inlet channel and touches the second contact switch, the controller starts the driving motor, and the driving motor drives the sliding block on the chain to move upwards.
3. The tennis fixed-point swing training device of claim 1, wherein: the lifting adjusting part comprises a hollow frame body and a box body, an electric push rod is arranged in the hollow frame body, the box body is nested in the hollow frame body, the electric push rod is connected with the bottom of the box body, a bottom plate is arranged at the top of the box body, and the supporting rod and the supporting seat are arranged on the bottom plate.
4. A tennis fixed-point swing training device as defined in claim 3, wherein: two strip-shaped guide grooves are formed in the front side face and the rear side face of the box body, two strip-shaped guide columns are arranged on the front inner side wall and the rear inner side wall of the hollow frame body, and the strip-shaped guide columns are located in the strip-shaped guide grooves.
5. The tennis fixed-point swing training device of claim 1, wherein: the chain driving mechanism comprises a driving motor, a first gear, a second gear, a chain, an upper positioning seat, a lower positioning seat and a guide rod; the drive motor and the lower positioning seat are arranged on the supporting seat side by side, the first gear and the upper positioning seat are arranged on the guide arm side by side, the second gear is arranged on a rotating shaft of the drive motor, the chain is arranged between the first gear and the second gear, the guide rod is fixed between the upper positioning seat and the lower positioning seat, the sliding block is sleeved on the guide rod, the sliding block is connected with the chain, and the chain can drive the sliding block to move up and down on the guide rod.
6. The tennis fixed-point swing training device of claim 1, wherein: the elastic ball-jacking piece comprises a hinged portion and a supporting piece, the hinged portion is arranged on the sliding block, the supporting piece is connected with the hinged portion, a supporting column is arranged on the supporting piece, an elastic piece is connected onto the supporting column, and a fixing ring used for placing a tennis ball is arranged on the elastic piece.
7. The tennis fixed-point swing training device of claim 6, wherein: the elastic piece is an elastic steel wire rope.
8. The tennis fixed-point swing training device of claim 1, wherein: an opening is formed in the bottom of the first ball feeding plate, an elastic ejector rod is arranged on the supporting seat and penetrates through the opening, and the elastic ejector rod faces a ball outlet of the ball inlet channel.
9. A tennis fixed-point swing training device as defined in claim 3, wherein: a battery is arranged in the box body and provides power for the controller and the driving motor.
10. The tennis fixed-point swing training device of claim 1, wherein: the goal lane is spiral.
CN201922351815.5U 2019-12-24 2019-12-24 Tennis fixed point swing training device Expired - Fee Related CN211410926U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922351815.5U CN211410926U (en) 2019-12-24 2019-12-24 Tennis fixed point swing training device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922351815.5U CN211410926U (en) 2019-12-24 2019-12-24 Tennis fixed point swing training device

Publications (1)

Publication Number Publication Date
CN211410926U true CN211410926U (en) 2020-09-04

Family

ID=72283940

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922351815.5U Expired - Fee Related CN211410926U (en) 2019-12-24 2019-12-24 Tennis fixed point swing training device

Country Status (1)

Country Link
CN (1) CN211410926U (en)

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GR01 Patent grant
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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200904

Termination date: 20211224

CF01 Termination of patent right due to non-payment of annual fee