JPH0527960Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a tennis training wall that can be used by one person to practice tennis.

[Prior Art] Conventionally, this type of device is as follows.

1 Tennis practice is usually done by two people.

2. Practice against an upright flat wall 5.

3 Hit a ball with a rubber string attached.

[Problems to be solved by the invention] The conventional techniques had the following problems.

1. It is really inconvenient that two people must practice tennis together.

2. The rebound of a return ball when facing an upright flat wall 5 is small. (See Figure 8) 3. For ball hitting balls with rubber strings, practice areas are limited.

4. With the conventional method, the ball quality in cases 2 and 3 is different from that in actual play, so there is little expectation of practical practice effects.

The present application was made in view of the problems of the prior art, and its purpose is to provide a solution to the above-mentioned problems.

Referring to Figure 9, by dealing with a curved surface,
The return ball has a longer distance, which increases the rebound and allows you to practice with a feeling similar to actual combat.

[Means for Solving the Problems] In order to achieve the above object, the present invention is as follows.

That is, in the present application, the vertical wall 3 which is connected to the front end of the bottom part 2 and has an L-shaped cross section is composed of a lower vertical wall part 3A and an upper wall part 3B. The front surface 3B1 is formed into a horizontally curved surface, and the curved surface is formed of a clothoid curve, such as a curved surface formed of a circle, or a curve other than a clothoid curve, and there is a space between both ends of the back surface of the vertical wall body 3 and the upper surface of the bottom portion 2. This tennis training wall is provided with support walls 4 and has connection holes 4A for connecting the support walls 4 in parallel.

[Effect] The device of this invention is used as follows.

1 Connect the tennis training walls in a horizontal line.

2. The front garden will be flattened over a length of approximately 20 meters to create a formal tennis court.

The meaning of this approximately 20m is as follows. Determined from the official standards for tennis stadiums. The maximum distance from the net post to the back wall of the baseline is 20.9 m, and the minimum distance is 18.1 m.

3. The practitioner drives toward the curved part of the wall.

4. The angle of reflection of the ball differs depending on the position of the ball, so a repulsive ball has a variety of directions, unlike when it hits a smooth surface.

Therefore, even if you are practicing alone, you can continue to practice in a way that is no different from practicing with an opponent.

[Example of idea] Examples will be described with reference to the drawings.

1 is the proposed tennis training wall made of concrete.

Reference numeral 2 denotes a plate-shaped bottom section having a rectangular planar shape, and 3 a vertical wall body that is connected to the front end of the bottom section 2 and has an L-shaped cross section, and includes a lower vertical wall section 3A and an upper wall section 3B.
It is composed of.

In this case, the height 3A1 of the lower vertical wall portion 3A is approximately 1 m above the ground.

This height of approximately 1m is assumed to be a well-known net.

The front surface 3B1 of the upper wall portion 3B is formed into a curved surface that faces laterally.

This curved surface is composed of a clothoid curve or a curve other than a clothoid curve, such as a curved surface composed of a circle.

In the illustrated case, the surface is a curved surface composed of a clothoid curve.

That is, FIGS. 3 and 5 show a state where the radius curve becomes smaller as it goes downward, and FIG. 7 shows a state where the radius curve becomes smaller as it goes upward.

Reference numeral 4 denotes a support wall provided between both rear ends of the vertical wall body 3 and the upper surface of the bottom part 2, and this is used for two purposes: to connect the parts of the present application in parallel and to ensure stability after installation. It has a role.

This supporting wall 4 is provided with a connecting hole 4A for connecting adjacent walls.

[Effects of the invention] Since the present invention is configured as described above, it produces the following effects.

1. I can practice tennis by myself.

2. Since the ball is constructed of a curved surface such as a circle, as shown in FIG. 10, the rebounding ball will be in a convergent state, allowing for more reliable practice.

That is, the return ball to the batted ball falls while traveling toward the center area 6 of the curved surface, and after touching the ground,
The ball rebounds toward the batter, but in this case, the position of the point of contact moves back and forth depending on the speed of the ball, but since the returned ball passes through the center area of the curve, the point of contact converges within a certain range. Ru.

Therefore, the batter only needs to move (move) less when hitting the ball again.

It can be said that a clothoid curve is a continuous curve of circles with different radii.

In this case, the center of the circle moves.

The range of the moving center position will be referred to as the central region.

3. In particular, when a curved surface is formed using a clothoid curve, the repulsive return ball can be varied in a variety of ways.

4. The area required for practice is half the area of the prescribed court.

5. If the ball hits the lower vertical wall portion 3A, it is obvious that the ball is out.

6. Since the support wall 4 has connection holes 4A for connecting adjacent walls, a tennis training wall of any width can be formed.

7 The present invention is of a fixed type, and even if there is a step behind the practice surface, it can also be used as a self-supporting retaining wall as shown in Figure 11.

[Brief explanation of the drawing]

Fig. 1 is a front view, Fig. 2 is a rear view, Fig. 3 is a right side view, Fig. 4 is a plan view, Fig. 5 is an end view taken along line A-A, and Fig. 6 is a perspective view of the installed state. FIG. 7 is a right side view of another embodiment, FIG. 8 is a schematic side view explaining the conventional state, FIG. 9 is a schematic side view explaining the state of the present invention, and FIG. 10 is a curved side view. FIG. 11 is a schematic side view illustrating the operation and FIG. 11 is a schematic side view illustrating another state of use. 1... Tennis training wall, 2... Bottom, 3... Vertical wall body, 4... Support wall.

Claims (1)

[Scope of utility model registration request] The vertical wall body 3 which is erected and connected to the front end of the bottom part 2 in an L-shaped cross section is composed of a lower vertical wall body part 3A and an upper wall body part 3B.
1 is composed of a horizontally curved surface, and the curved surface is composed of a clothoid curve such as a curved surface composed of a circle, or a curve other than a clothoid curve. A wall 4 is provided,
A tennis training wall characterized in that a connecting hole 4A for connecting the support walls 4 in parallel is provided.