JPS6217100Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tennis practice device, and more specifically, it provides a tennis practice device that can adjust the bounce angle and has at least two or more planes with different angles to the ground surface. .

Simple tools and devices used for basic tennis practice include those that hit a ball fixed to a heavy cone with rubber strings, and those that hit a ball against a board made to stand on its own with support members. Stroke machines and the like that hit the ball according to a pre-programmed sequence have been put into practical use.

You can practice using the above-mentioned board, that is, the practice board, by hitting the ball with your own racket and hitting the board again as the ball bounces off the board, but depending on the gender and age of the person practicing, it may be difficult to practice. If someone who is not good enough hits the same practice board, they will not only be unable to master the basics of hitting against the wall, which is the original purpose of the board, but also end up hurting their wrists on a board that is designed for people with strength. There are many cases.

In other words, as shown in Figure 1a, in the case of a strong person, especially an adult male, the distance _l1 from the practice board TB to the stance position of the person practicing is large, so the ball bounces off the practice board TB. The ball that comes to the ground has plenty of space, making it possible to practice repeatedly, but as shown in Figure 1b, people who lack strength, especially women and children, inevitably have a small distance _l2 from their stance position to the practice board. The ball hits the practice board and bounces weakly, and the bounce position is forward, so there is no margin and the correct follow-through is not possible, which not only makes the practice less effective, but also causes the ball to bounce before the back swing is sufficient. position, which results in wrist injury.

Here, in the case of the practice board TB that is perpendicular to the ground as shown in Figure 2a, in the case where the entire surface is slightly inclined backwards as shown in Figure 2b, and in the case of the practice board TB as shown in Figure 2c. Similarly, if the slope of the front surface is even greater, if you hit a ball with the same force against the same position on the practice board, the rebound point will be BP ₁ to _{BP 3} .
The distance from the practice board TB increases in this order.
In other words, even people with insufficient strength can practice hitting the ball from the same position as people with strength, but three or more types of practice boards must be prepared, and the same type of board can be used by multiple people. had the disadvantage of requiring a waiting time. Also, Utsukai Showa 50-127562
As shown in the publication, the two sides of the folding plate made of an appropriate material are fitted with approximately U-shaped mounting brackets on both sides of the folding point to make both plates flat or one of the plates slightly forward or slightly forward. A tennis practice board has been disclosed that is tilted backwards and is attached from both sides by changing the shape of the board surface, and is held upright so that the support shaft provided on the mounting bracket can be rotated by the support leg. In order to change the angle of the counterboard, the length of the wire or rope must be changed, which requires changing the knot of the rope and adjusting the mounting hardware each time, which is cumbersome and unusable. There are serious drawbacks.

As mentioned above, this idea was aimed at solving the shortcomings of conventional practice boards, and its feature is that one side of the board, which has a flat surface, is bent inward at a certain angle. A practice board, means for rotatably pivoting the practice board to a support, and a rotation mechanism capable of rotating the practice board via the pivoting means and maintaining the state after rotation. The present invention provides a tennis practice device which is equipped with the above-mentioned practice board and is capable of varying the angle formed between one surface of the practice board and the ground surface. An embodiment of this invention shown in the drawings will be described in detail below.

As shown in Fig. 3 a, b and Fig. 4 a, b, one side of the board 2, which has a flat surface and is made of a rigid material and has a certain size of 300 x 300 cm, has a central part. A certain angle on one side (10 as an example)
゜) A support shaft 4 is fixed to the other side of the front folded part of the bent practice board 1 with a pair of fixing members 3, and an anchor bolt 6 is attached to the practice court 5 whose ground surface is leveled with concrete or asphalt. The support shaft is installed horizontally via a bearing member between a pair of supports 7 whose height is approximately half the height of the training board set upright, and one end of the support shaft is mounted as shown in FIGS. 5a and 5b. A worm gear 9 is fixed with a key pin 8 to the worm gear, and a worm 10, which is rotatably supported by a gear housing 11 which also serves as a bearing member and can be rotated by a handle 12 at one end, is meshed with the worm gear. A rotating mechanism 13 that can maintain a moving state is installed. still,
This practice device can be used with two units side by side, for example 600
In order to construct a wall surface of x300cm, the rotation mechanism is provided on the left and right sides, and the end of the support shaft 7 on the side where the mechanism is not attached is prevented from protruding outward from the plate member 1. .

This training device has the above-mentioned configuration, and by turning the handle 12, the lower end 1a of the training device 1 is perpendicular to the court surface, as shown in FIGS. 3a and 3b.
Alternatively, as shown in FIGS. 4a and 4b, the upper end 1b of the practice board 1 is used so as to be at right angles to the court surface.

FIGS. 6a and 6b show practice devices A and B with different states of the practice board 1, both of which use the upper end side 1b to receive a lobbing ball from an opponent, that is, a ball with a high spring, or a high ball, and to send it back to the opponent. When practicing returning a mountain-like ball like a lobbing ball, it is especially suitable for people with weak strength, and the 6th
In Figure 6, the ball is rotated clockwise by 10 degrees and the upper surface is perpendicular to the court surface, so if the ball is hit with the same force, the ball will bounce back, whereas in the case of Figure 6, the ball is tilted forward, so the ball will bounce back and the force will be smaller. Become a strong person.

Figures 7a and b show strokes using the lower end 1a with the practice board 1 in the same state as in Figures 6a and b.
By returning a smash or low volley, the results shown in FIGS. 7a and b are the same as those of FIGS. 6b and a.

If two training devices are installed side by side and one of them is set as shown in Figure 6a and the other is set as shown in Figure 6b, a strong person and a weak person can practice at the same time. obtain. In addition, although we have shown an example of practice board 1 being rotated by the bending angle of 10 degrees, it is also interesting to use it by rotating it up to about 20 degrees. By creating small irregularities on the surface, you can get a highly unusual return ball, and you can practice advanced practice by incorporating darts, backswings, and side-to-side movements.

As described above, this invention includes a practice board in which one side of a board having a flat surface is bent inward at a certain angle, a means for rotatably pivoting the practice board to a post, and The practice board is provided with a rotation mechanism that can rotate the practice board through the attachment means and maintain the state after rotation, and the angle formed between one surface of the practice board and the ground surface can be varied. strong person,
Even weak people can practice repeatedly in a certain stance position, and they can learn advanced techniques by using a specific surface of the practice board and the angle between that surface and the court surface, and the structure is simple. have

[Brief explanation of the drawing]

Figures 1 a, b and 2 a to c are diagrams for explaining the practice situation on a conventional practice board;
Figures a, b to 7 a, b all show one embodiment of this invention, and Figures 3 a, b and 4
Figures a and b are front and side views of the practice device with the angle of the practice board changed, Figure 5a is a cross-sectional view of the rotation mechanism taken along line A-A in Figure 5b, and Figure 5b is a cross-sectional view of the rotating mechanism. A sectional view taken along the line BB in FIG. 5a, FIGS. 6a and 6b, and FIGS. 7a and 7b are views for explaining an example of the use of this device. 1... Practice board, 2... Board material, 3... Fixed member,
4... Support shaft, 5... Practice coat, 6... Anchor bolt, 7... Support, 8... Key pin, 9... Worm gear, 10... Worm, 11... Gear casing, 12... Handle, A, B...Practice equipment.

Claims (1)

[Scope of utility model registration request] A support shaft 4 is attached to the other side of the training board 1, which has a flat surface and is made of a rigid material and is bent at a certain angle to one side at the center, via a pair of fixing members 3. is fixed, and the support shaft 4 is horizontally installed via a bearing member between a pair of supports 7 having a height of about half the height of the practice board 1 which is erected on the practice court 5 via anchor bolts 6, A worm gear 9 is fixed to one end of the support shaft 4 with a key pin 8, and a worm 10 is engaged with the worm gear 9, which is rotatably supported by a gear housing 11 that also serves as a bearing member and can be rotated by a handle 12 at one end. 1. A tennis practice device comprising a rotation mechanism 13 that rotates and maintains the rotation state.