JPH0741490Y2 - Ball game practice equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a ball training device, and more particularly, to a flight provided with a ball and a frame that supports and fixes the flight distance of the ball via an elastic body. And a restrictor, the elastic body,
The present invention relates to a ball game practice tool including a frame fixing portion fixed to the frame, and a ball fixing portion connected to the frame fixing portion for fixing the ball to the other end.

[Conventional technology]

Conventionally, rubber has been generally used as an elastic body in this type of ball game practice tool, for example, a tennis practice tool.

Then, by impacting the ball fixed to one end of the elastic body, the elastic force of the rubber elastically causes the ball to fly forward, and then the contracting force of the rubber causes the ball to fall to the floor and impact the ball again. I practiced by repeating the action of doing. In this case, a method has also been used in which a reflector is provided on the front surface in the flight direction of the ball and the repulsion of the ball from the reflector is used.

[Problems to be solved by the device]

In the above-mentioned conventional technical training tool, regardless of whether the rubber used is natural rubber or synthetic rubber, the stretching / contracting action depends only on the elastic force of the rubber, and the stretching action of the rubber itself. Had a strong effect on the movement of the ball.

In other words, the ball's motion in the free state, which is not affected by the elastic body at all, has the maximum initial velocity at the time of impact, and the velocity fluctuates gradually while being influenced by air resistance and gravity. The same applies when the opponent returns the ball.

However, in a state where the elastic body is connected, the ball after impact flies up to the middle while being mainly affected by the air resistance and gravity, and when the elastic body expands, the air bank resistance and In addition to the influence of gravity, the elastic body gradually increases in elastic resistance as the elastic body stretches, and flies while being rapidly decelerated. Then, when the ball returns, the elastic return force of the elastic body acts more strongly by overcoming the flight resistance due to the influence of air resistance and gravity.

The movement of the ball when returning due to the action of this elastic return force is different from the movement of the ball in the completely free state described above, and becomes different. In other words, the speed at which the ball starts to return (initial speed) is low, and then the ball is returned to the player side while being rapidly accelerated by the acceleration due to the elastic return force of the elastic body.

Therefore, the movement of the ball with respect to the hitting position of the player is significantly different from the actual movement of the ball, and even if the hitting movement is repeatedly practiced with the ball having such movement, the movement of the ball is different from the actual movement of the ball. Was completely different and was unsuitable for hands-on practice.

Therefore, in order to solve the problems of the above-described conventional technology, the present invention minimizes the influence of the elastic body on the movement of the ball and causes the ball to fly with a movement in a state close to natural,
It is an object of the present invention to provide a ball game practice tool that facilitates repeated practice with a ball that behaves similarly to an actual ball.

[Means for Solving the Problems]

The technical means of the present invention taken to achieve the above object are:
A frame, which is provided with a ball and a flight restricting device that restricts a flight range of the ball, is fixed to a predetermined position of the flight restricting device, and the frame and the ball are connected to determine a flight distance of the ball. In a ball game practice tool configured with an elastic body to be regulated, at least a part of the elastic body regulates an extension range of the rubber thread within a length range before a rubber thread having a predetermined length and the rubber thread is fully extended. A plurality of combination strings configured by combining the restraint strings with each other are connected in the string length direction, and each combination string connected in the string length direction has a different elastic return force. It is set to.

The elastic body of the flight restrictor has one end side connected to a frame fixing portion whose both ends are fixed to the frame in a direction substantially along the flight direction of the ball, and an intermediate portion of the frame fixing portion. It is preferable that the other end side is composed of a ball fixing part connected to the ball, the frame is held in the air, and the ball fixing part hangs the ball in the air.

Further, a downward displacement restricting tool is provided on the frame portion between the fixed ends of the frame and the frame fixing portion of the elastic body and the connection portion of the frame fixing portion and the ball fixing portion of the elastic body, It is preferable that the elastic body is configured to restrict downward movement of the frame fixing portion.

Furthermore, it is convenient to provide a front reflector which is arranged at a front position in the flight direction of the ball so as to reflect the flying ball.

Furthermore, it is more convenient if a floor reflector for a bound ball is provided on the floor surface.

[Action]

The effect of taking the above technical means is as follows.

Since the ball-practice practice tool of the present invention has the above-described structure, when the elastic body of the portion directly connected to the ball expands as the ball flies, a rubber thread of a predetermined length and the rubber thread are Of the combination cords configured by combining a restraint cord that restricts the extension range of the rubber thread in the length range before the extension, the combination cord of the portion in which the elastic return force of the rubber thread is set to the weakest, The ball will first be stretched in the flight direction.

In the combination string, the fibers covering the rubber thread before the rubber thread of the core is fully stretched restrain the extension of the rubber thread of the part constituting the combination string, and therefore the rubber of the part The yarn does not extend any further, and the stretching action due to the flight of the ball acts as an action force for stretching the next combination string. Next, the part of the combination string in which the elastic return force is set to be weak is stretched, and the combination string is sequentially stretched in order of strength of the elastic return force.

In this way, when the flight range of the ball is set within the allowable range and the elasticity of the rubber thread acts as the elastic resistance for obtaining the return ball according to the strength of the hit ball, only one type of elastic return The range in which the elastic restoring force of the elastic body acts can be set extremely wide compared to the case where a rubber thread having a force is used, and the movement of the ball when the elastic body extends can fly in a more free state. It can be an exercise close to.

In other words, the rubber thread used to obtain the elastic resistance necessary for setting the flight distance has one kind of elastic coefficient, with the allowable flight distance of the ball at the expected strength of the hit ball being constant. In the case of the rubber thread, the range from the start of the stretching action accompanying the flight of the ball to the rubber thread to the reaching of the stretching limit position is naturally determined to be a fixed range. as,
A combination string is formed by a combination of a rubber thread that forms a part of the elastic body and a restraining string that restricts the extension range of the rubber thread to a predetermined range before it is fully extended, and the combination string in the string length direction. Since multiple sets are connected and the elastic return force is set differently for each combination string, it is possible to set the rubber thread with a weak elastic return force to start giving resistance from the early flight range of the ball. . Therefore, the rate of change of the flight speed of the ball becomes smaller, and the flight speed becomes closer to that in the free state.

When the elastic body contracts, even if the elastic body is apparently fully extended, it does not limit the flight range of the ball when all the rubber threads are fully extended. The flight range of the ball is limited by the resultant force with the rubber thread. In this state, even if the restraining string of the combination string constituting the elastic string is applied with uniform tension over its entire range, even tension is applied over its entire range with the rubber thread portion. Instead, the tension of the rubber thread is different for each combination cord unit.

Therefore, at the time of contraction, it can be said that all the rubber threads tend to contract, and the rubber thread having a strong elastic return force tends to contract earlier than the rubber thread having a weak elastic return force. . In other words, the tensile force of the strong rubber thread that contracts first acts on the rubber thread where the elastic return force is weak, and the contraction is limited. become. As a result, the elastic restoring force of the elastic body applied to the ball can avoid the sudden acceleration of the ball as in the case of using one rubber thread.

[Effect of device]

 The effects obtained by adopting the above configuration are as follows.

That is, by adopting the above configuration, it is possible to limit the flight range of the ball by the elastic body while maintaining the state of the movement of the ball as close as possible to the movement in the free state, so that in a limited space. , You can practice by repeatedly using a ball that moves in a state close to the actual movement of the ball.

Further, the frame of the flight restrictor is held in the air, the frame fixing portion of the elastic body is fixed to the frame in a state substantially along the flight direction of the ball, and the ball fixing portion of the ball is fixed. It is convenient to use it as a tennis practice tool when it is hung in the air because the ball does not roll down on the floor or the ground.

A downward displacement restricting member is provided at the frame portion between the fixed end of the frame and the frame fixing portion of the elastic body and the connection portion of the frame fixing portion and the ball fixing portion of the elastic body, If the downward movement of the frame fixing part of the body is regulated, even if the elastic body expands and contracts by hitting hard, the elastic body moves downward when the ball is suspended. The displacement can be relatively small. Therefore, the size of the training tool is not increased, and the height is not increased, that is, the fixed position between the elastic body and the frame does not become high, and the ball after hitting returns to the original hanging position. Easier, and repeated striking becomes easier.

If a front reflector is placed in front of the ball in the flight direction so as to reflect the flying ball, the repulsive force of the reflector can be used, which makes it easier to practice repeatedly and repeatedly. It's convenient to be able to practice.

Furthermore, if a floor reflector for a bound ball is provided on the floor, it is possible to select and use a reflector having various reflecting surfaces on the surface, so that the landed ball is repelled by the ground and returns to near the player's position. The ball that was full of changes returned when
It becomes possible to practice more realistic repeated hitting.

〔Example〕

An embodiment of a ball training device according to the present invention will be described in detail with reference to the drawings, using a ball training device as a tennis training device as an example.

1 and 2 show a schematic structure of a ball practice tool, and FIG. 3 shows an enlarged structure of a ball fixing portion (3) of an elastic body (A).

This ball game practice tool includes a ground support tool (6) which is a flight control tool for suspending and arranging the ball (4) at a predetermined position, and a front reflector (12) which reflects the hit ball (4) to the player side. , And a floor reflector (11) for changing the angle of the ball once dropped from the front reflector (12) to the floor to repel it.

The ground support tool (6) supports the frame (1) arranged in the front-rear direction, and attaches a weight to an L-shaped post (9) having the center and the tip of the frame (1) fixed. It consists of an installation leg (7) that can be placed. The upper part of the installation leg (7) is formed in a pipe shape into which the lower end of the L-shaped post (9) can be vertically slidably inserted, and the height of the L-shaped post (9) can be increased. The position can be determined by a fixture (8).

The frame (1) has a pipe shape and elastic bodies (A) are fixed to both ends thereof. The elastic body (A) is composed of a frame connecting portion (2) and a ball fixing portion (3) on the frame (1), and both are connected by a detachable connector (13). The parallel elastic body portion (2) has a pair of ring-shaped downward displacement restricting devices ( The downward hanging of the ball is restricted by 5).

The ball fixing portion (3) of the elastic body (A) is
As shown in the figure, it consists of a flat rubber tape part connected to the connector (13), and this flat rubber tape part bundles 36 combination strings in which rubber threads are covered with a restraining string in parallel. , A combination cord unit configured in a flat plate shape, a combination cord unit configured in a flat plate shape by bundling 24 combination cords connected in parallel to the lower end of the combination cord unit, and 12 units connected to the lower end of the combination cord unit. It is composed of a combination string unit in which the combination strings are bundled in parallel and configured in a flat plate shape, and a ball (4) is hung at the tip portion thereof.

Since the combination cord unit forming the ball fixing portion (3) of the elastic body (A) is made of such a combination,
Before the rubber thread forming the core is fully stretched, the restraining force of the fiber covering the rubber thread acts to suppress the expansion of the elastic body (A) within a certain range, and in addition, each part is bundled. The strength of the contraction force in the extension range is set by the difference in the configuration of the combination string unit.

That is, the ball fixing portion (3) of the elastic body (A) is composed of a rubber thread of a predetermined length and a restraint string that restricts the extension range of the rubber thread within the length range before the rubber thread is fully extended. It is configured by connecting a plurality of combination strings configured by combinations in the string length direction. The respective combined strings connected in the string length direction are set to have different elastic return forces in the string length direction due to the difference in the number of bundles of the combined string unit as described above.

It should be noted that various combinations can be considered for the configuration of the bundled combination string unit, and the essential point is that one or more bundled combinations are made up of different combinations.

Further, the reflecting plate (12) has a plurality of reflecting surfaces so that the reflected ball can be changed. By changing the angles of a plurality of reflecting surfaces, or by changing the number of reflecting surfaces, it is possible to obtain a returning ball with a great variety.

In Figs. 1 and 2, the front reflector (12) is set to 1 in the flight direction.
Although the reflectors are separately provided, another type of reflectors may be provided upright on the left and right sides thereof, and the combination thereof may be various modes.

On the other hand, the floor reflector (11) provided on the floor surface is not always necessary, but if a gentle gradient is provided in the front and rear and in the width direction as shown in Figs. This is convenient when the player repeatedly expects a more realistic return ball that is repulsed from the board (11) and repeatedly hits.
Also for this floor reflector, it is possible to use a plurality of reflectors in combination.

The floor reflector (11) can be made of various materials such as those having different repulsive forces or those having different surface irregularities.

The above reflector may have a structure that can be changed at an arbitrary angle.
For example, an electric motor is attached to each of the combined reflectors, and the attitude of each reflector is changed by the remote controller. At this time, the reflection angle may be calculated in advance using a computer, and the reflection surface of the reflection plate may be controlled according to the calculation result so that the returning position of the reflection sphere can be arbitrarily selected.

In the above embodiment, the flight control tool (6) is a ground support tool standing upright from the ground, but it may be of a type in which the frame is fixed to the ceiling or the like, and the frame part is laid on the ground. But it's okay.

In the above-mentioned embodiment, the case of using it as a tennis practice tool is taken as an example, but the present invention is not limited to this, and it goes without saying that the ball game practice tool according to the present invention can be applied to various ball games.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing one embodiment of a ball game practice tool according to the present invention, FIG. 2 is a schematic overall side view, and FIG. 3 is an enlarged view of a main part of a ball fixing portion of an elastic body. (1) ... frame, (2) ... elastic frame fixing part, (3) ... elastic ball fixing part, (4) ...
Ball, (6) …… Flying control device, (11) …… Floor reflector,
(12) …… Front reflector, (A) …… Elastic body.

Claims (5)

[Scope of utility model registration request] 1. A frame (4) comprising a ball (4) and a flight control tool (6) for controlling the flight range of the ball (1), the flight control tool (6) being fixed in position at a predetermined position ( A ball game practice tool comprising: 1) and an elastic body (A) that connects the frame (1) and the ball (4) to restrict the flight distance of the ball (1). At least a part of the elastic body (A) is a combination string composed of a combination of a rubber thread of a predetermined length and a restraining string for restricting the extension range of the rubber thread within a length range before the rubber thread is fully extended. , A plurality of sets are connected in the string length direction, and further, each combination string connected in the string length direction is set to have different elastic return forces. Ingredient 2. The elastic body (A) of the flight control tool (6) is
A frame fixing portion (2) whose both ends are fixed to the frame (1) in a direction substantially along the flight direction of the ball.
And a ball fixing portion (3) whose one end side is connected to an intermediate portion of the frame fixing portion (2) and the other end side is connected to a ball, and the frame (1) is placed in the air. The ball game practice tool according to claim 1, wherein the ball fixing portion (3) is held in a position so that the ball (4) suspends the ball (4) in the air. 3. A fixed end of the frame (1) and a frame fixing portion (2) of the elastic body, and a connection point of the frame fixing portion (2) and the ball fixing portion (3) of the elastic body (A). 3. The ball game according to claim 2, wherein a downward displacement restricting tool (5) is provided in the frame (1) portion between the two, and restricts downward movement of the frame fixing portion (2) of the elastic body (A). Exercise equipment. 4. The ball practice tool according to any one of claims 1 to 3, further comprising a front reflector (12) arranged at a front position in the flight direction of the ball so as to reflect the flight ball. 5. A floor reflector (11) for a bound ball on the floor.
The ball game practice tool according to any one of claims 1 to 4, further comprising: