JP2003052879A - Tennis training machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tennis training machine for effectively training tennis by self-training. SOLUTION: The purpose is attained by the tennis training machine that a shaft 1 rotatably journaling a ball 2 on the tip, and having the preset length for installing a restoring weight 3 on the rear end is inserted and arranged so as to freely advance, retreat, and rotate between a preset interval of upper and lower rollers of a roller shaft guide 6 having respectively idly rotatably a plurality of rollers above and below at the preset interval in an installing body 4, and the roller shaft guide 6 is journaled and arranged in an upper part of a stand 7 for freely adjusting the height so as to be freely rotatable at a preset angle by a support shaft 8.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] In relation to a tennis practice machine where you can learn by yourself, you can adjust the height of the ball, check the swing form of the ball, practice correct hitting, and quickly hit the ball hard, If you hit it lightly, it will be slow and it will automatically return to the original position, so you can practice hitting back continuously, you can also practice split step batting method that you step on and hit the opponent's ball, and you have the ball rotatable Therefore, you can practice how to hit the ball that does not rotate (flat) and how to hit it to rotate in the desired direction (spin, slice, etc.) by visually observing the rotation of the ball. We provide a tennis training machine that allows you to practice various exercises according to the practice from beginners to advanced players by yourself in a small space.

[0002]

[Problems with the conventional method] The task of improving tennis practice is to look at the ball, hit the correct swing form, hit the racket at the correct position (sweet spot), and strengthen the ball to the place where you think. Also, if you hit it weakly, the ball you hit will immediately come back by the opponent, but how quickly you hit it back, how to practice continuous hitting back, how to hit the ball is flat (no rotation) ), Spin, slice, etc. to rotate the ball in the desired direction, but how to practice it, there are still many challenges from beginners to intermediate and advanced players. However, no tennis practice machine has been provided that can effectively perform the exercises correctly corresponding to those tasks by self-study.

For example, there is a practice tool in which a rubber band is attached to the ball.
Also, since it has to be picked up for each shot, it is extremely inefficient, and of course, it cannot be practiced for a correct swing and cannot be practiced for continuous hitting back.

There is also a training machine in which a ball is mounted on an elastic support such as a coil spring standing upright on a base, and when the ball is hit, the elasticity of the support causes the ball to return to its original position. If you hit it hard, the elastic pillar, that is, the ball will continue to shake for a while, and the recovery stabilization time will vary depending on the strength and weakness of the hit, so continuous striking practice and the opponent hitting the ball hit by us It is not possible to practice split step striking that assumes. Furthermore, since the ball does not rotate, the results of practice such as flattening, spinning, and slicing cannot be confirmed, making it unsuitable.

[0005]

Therefore, according to the present invention, the ball at the tip of the shaft is set to a desired height by adjusting the height of the stand, and the ball is swung fast and weakly by the action of the shaft and the roller shaft guide. It allows you to automatically and slowly return to the original position so that you can practice continuous hitting back and practice a split-step batting method where you hit the opponent's ball one step back to hit it, and the shaft is rotatable. By rotatably attaching the ball to the tip, practice how to hit flat, spin, slice, etc., and see the rotation of the ball and its slow speed so that you can see the effect of the hit well. The tennis practice machine of the present invention has solved the above conventional problems.

[0006]

That is, according to the present invention, a shaft of a set length having a ball rotatably supported at its tip and a restoring weight attached to its rear end, and a plurality of rollers mounted on a mounting body and having a plurality of rollers arranged at upper and lower intervals. In each of the roller shaft guides provided for free rotation, the roller shaft guides are installed so that they can be moved forward, backward, and rotatably within the set intervals of the upper and lower rollers.
With a tennis training machine that has a support shaft on the top of a stand that is adjustable in height so that it can rotate freely at a set angle.
It is a solution to the problem.

[0007]

EXAMPLES Next, examples of the present invention will be described. (Figure 1
(Fig. 8) A shaft 1 of a set length having a ball 2 rotatably supported at the front end and a restoring weight 3 mounted at the rear end thereof, and a plurality of rollers 5a, 5b mounted on a mounting body 4 at predetermined intervals. A stand provided with the roller shaft guide 6 which is freely rotatable and which is inserted through the roller shaft guide 6 so that the roller shaft guide 6 can be moved forward, backward, and rotatably within a set interval between the upper and lower rollers 5a and 5b, and the roller shaft guide 6 is adjustable in height. A tennis training machine is provided on the upper part of 7 by a supporting shaft 8 so as to be rotatable by a set angle.

In the above tennis training machine, the shaft 1
Is attached to the tip of pipe material, rod material, etc. with a set length of circular cross section,
For example, a two-branch bracket 9 is fixed, a ball 2 is rotatably mounted on a shaft 10 which is mounted between the two forks, and a weight 3 at the rear end restores the shaft 1 to its original position at all times. Is attached.

The roller shaft guide 6 includes a plurality of rollers 5a and 5a mounted on a mounting body 4 having, for example, a casing or plate shape.
b is provided to be freely rotatable at upper and lower set intervals, and the shaft 1 is inserted between the set intervals of the upper and lower rollers 5a and 5b so as to be forward, backward and rotatable.

The stand 7 includes, for example, a telescopic pipe type in which a small-diameter corner or round pipe is telescopically inserted into a large-diameter corner or round pipe, and other height adjusting means 11, and a roller shaft is provided on the upper portion thereof. A guide 6 is provided so as to be pivotally supported by a support shaft 8 so as to be rotatable by a set angle, and a roller shaft guide 6 by a stand 7 is provided.
Is set to a position where the center of gravity of the roller shaft guide 6 and the shaft 1 as a whole is deviated to the ball 2 side of the shaft 1, so that the weight of the roller shaft guide 6 tilts and the weight of the shaft 1 decreases. The ball 2 is automatically returned to the original position P by the movement. In addition,
The stand (the expansion pipe part of it) does not rotate.

Roller 5 of roller shaft guide 6
The shape of a and 5b is, for example, a drum shape (illustrated example), a groove shape, or a flanged shape, and the shaft 1 that is inserted through the upper and lower rollers 5a and 5b so as to move forward, backward, and rotatably is external force. It is formed in a shape that does not come off.

When the ball 2 is hit with a racket, the shaft 1 moves forward and backward, the roller shaft guide 6 rotates, etc., and the shaft 1 and the roller shaft guide 6, and the roller shaft guide 6 and the stand 7 collide with each other. For example, cushion rubbers 12, 13, 14 and the like are provided at the positions where the shock absorbers are provided so as to buffer shocks and prevent noise generation.

When not in use, for example, the roller shaft guide 6 is rotated about the support shaft 8 to a position parallel to the stand 7, so that the stand 7, the roller shaft guide 6 and the shaft 1 are parallel to each other. It is designed to stand up and be stored.

[0014]

When the ball 2 in the original position P (the state shown in FIG. 1) is hit, the ball 2 and the shaft 1 are moved forward by the impact, and the cushion rubber 12 of the shaft 1 at the front part of the ball 2 is guided by the roller shaft guide 6. The collision is stopped at the front end (state of FIG. 6), the shaft 1 and the ball 2 immediately return to their original position P by their own weight, and the elastic force of the cushion rubber 12 synergizes. (Return to Figure 1)

When the ball 2 is struck by the flat striking method in which the ball 2 is in the axial direction of the shaft 1 or the ball 2 does not rotate, regardless of the strength or weakness of the striking, the action of straight advance or retreat is mainly performed as described above.

In particular, when the ball is hit with a strong force, or when the ball is hit with a hitting method that causes rotation (spin, slice),
Since a force is applied to the ball not only in the forward direction but also upward or downward, the ball and shaft advance and the cushion rubber collides with the front end of the roller shaft guide.
When the roller shaft guide rotates a set (forward) angle about the support shaft and collides with the stopper and stops (state of FIG. 7), the center of gravity of the entire shaft 2 and the roller shaft guide 6 becomes the support shaft 8. Since the roller shaft guide 6 and the shaft 1 are self-weighted, the roller shaft guide 6 is restored and rotated, and the shaft 1 is also restored and retracted, so that the ball 2 is in the original position. Return to P.

When the ball 2 is hit, the ball 2 rotatably mounted on the tip of the shaft 1 around the shaft 10 rotates about the shaft 10. At the same time, the shaft 1 also rotates between the rollers 5a and 5b of the roller shaft guide 6. Since it is freely inserted, it rotates. However, if the shaft 1 stops rotating at an arbitrary position (angle), the workability is bad. Therefore, the restoring weight 3 attached to the rear end of the shaft 1 automatically restores the original position. , Its original position is, for example, the original position P of the ball in FIG. 1, that is, the axis 1 of the ball 2.
0 is a substantially horizontal position.

At the end of practice or when not in use, the roller shaft guide 6 is rotated about the support shaft 8 to a position parallel to the stand 7 so that the stand 7 is parallel to the roller shaft guide 6 and the shaft 1. Store upright. (State of FIG. 8)

[0019]

[Effect] When practiced by having a coach or the like throw the ball out at a tennis school, unless the coach is a good coach, the ball cannot be struck at a certain place at a certain height or under other conditions, and the ball is too high. However, it is difficult to practice effectively, and it is not possible to improve on hitting a ball such as a height that is not particularly good, but the present invention is the height of the stand. Since the height of the ball can be adjusted up and down by adjusting the height, you can practice, for example, adjusting the ball to a height that you are not good at and then slowly hitting it many times to remember its feeling.

As described above, since the ball can always be positioned at the adjusted target position, when practicing strokes, volleys, etc., the ball should be carefully looked at and hit, the form should be held slowly, and the bad habits of the hands and feet should be avoided. You can fix it, check it for yourself, and practice repeatedly by hitting it. Therefore, it is possible to correctly practice how to look at the ball and hit it correctly (sweet spot), which is the basis of tennis practice.

According to the present invention, if the ball is hit hard, the ball returns quickly, and if the ball is hit weakly, the ball slowly returns. Therefore, the beginner can practice hitting the ball slowly and returning by adjusting the form, and Intermediate and advanced players can continuously practice to hit a ball that strongly hits and returns quickly, for example, by hitting a split step and hitting it back.

As described above, the present invention enables continuous ball-hit practice. Therefore, if the player is accustomed to this training machine, he / she can carry out continuous correct form practice and practice to accelerate the movement of the body.

When the ball is hit or hit back, the ball is hit so as not to rotate (flat), and the ball is hit so as to add rotation such as spin and slice.
Since the present invention includes the ball and the shaft rotatably,
If you practice the above ball, the ball will not rotate, or sooner
You can spin slowly and visually check the results of your practice.

In particular, when the ball is struck or the ball is struck hard to rotate, the ball and the shaft move forward at a tremendous speed, collide strongly with the roller shaft guide, and retreat and restore at a tremendous speed, which may be dangerous. In consideration of this, the present invention prepares for that, and in such a case, after the roller shaft guide rotates forward with the shaft by a set angle to absorb and absorb the shock, the roller shaft guide and the shaft restore by their own weight. So the ball has the feature of not slowly returning and dangerous.

As described above, according to the present invention, the position of the ball and the extremely short distance of the ball (shaft) (example, 50 to 60 cm) can be applied to a situation similar to hitting a ball on a tennis court.
It is realized during forward, backward, and rotation between the positions), and the moving dimension of the shaft can be short, so a full swing is performed in an extremely narrow space, for example, a space of 6 tatami mats, and a split step is performed. There is a feature that you can practice enough.

Further, since the roller shaft guide and the shaft can be erected in parallel with the stand so as to be rotated and housed, there is an advantage that the roller shaft guide and the shaft are not bulky and are convenient when not in use or during transportation.

[Brief description of drawings]

FIG. 1 is a front perspective view of a machine of the present invention.

FIG. 2 is a partially omitted front view of a shaft having a ball at a front end and a restoring weight at a rear end.

FIG. 3 is a plan view of FIG.

FIG. 4 is a partially cutaway front view of the roller shaft guide.

5 is a partially cutaway plan view of FIG.

FIG. 6 is a front view showing an operation when the ball of FIG. 1 is hit.

FIG. 7 is a front view showing the operation when the ball of FIG. 1 is particularly strongly hit or rotated.

FIG. 8 is a front view showing a case where a roller shaft guide and a shaft are stored upright in parallel with a stand.

[Explanation of symbols]

Original position of P-ball 1 shaft Two balls 3 Restoration weight 4 mounting body 5a, 5b roller 6 Roller shaft guide 7 stand 8 spindles 9 2 fork bracket 10 axes 11 Height adjustment means 12, 13, 14 cushion rubber 15 stopper

Claims (7)

[Claims] 1. A shaft of a set length having a ball rotatably supported at the front end and a restoring weight mounted at the rear end, and a plurality of rollers mounted on a mounting body, each roller being vertically rotatable at predetermined intervals. The roller shaft guide is installed so that it can move forward, backward, and rotatably within the set interval of the upper and lower rollers, and the roller shaft guide is rotated at a set angle with a support shaft on the upper part of the height adjustable stand. A tennis practice machine that is freely pivoted. 2. A shaft has a bifurcated bracket fixed to the tip of a pipe material, a rod material or the like having a set circular cross section, and a ball rotatably mounted on a shaft mounted between the two forks. The tennis training machine according to claim 1, further comprising a restoring weight attached to a rear end of the shaft to restore the shaft to the original position by the weight of the weight. 3. The roller shaft guide comprises a plurality of rollers mounted on a casing or a plate-shaped mounting body so as to be freely rotatable at upper and lower set intervals, and the shaft is provided between the set intervals of the upper and lower rollers. The tennis training machine according to claim 1, wherein the tennis training machine is provided so that it can be moved forward, backward, and freely rotated. 4. The stand is provided with a telescopic pipe type in which a small-diameter corner or round pipe is telescopically inserted into a large-diameter corner or round pipe, and other height adjusting means, and a roller shaft guide is provided on the upper portion thereof. It is equipped with a support shaft so that it can be rotated by a set angle, and the center of gravity of the roller shaft guide and the shaft is eccentric to the ball side of the shaft. Set it to where it is,
The tennis practice machine according to claim 1, wherein the ball is automatically returned to the original position by tilting the roller shaft guide by its own weight and moving the shaft by its own weight. 5. The roller of the roller shaft guide has a drum shape, a groove shape, a collar shape, or the like, and the shaft inserted through the roller shaft guide so as to move forward, backward, and rotatably within a set interval does not come off due to an external force. The tennis training machine according to claim 1, which is formed in a shape. 6. A cushion rubber at a position where the shaft and the roller shaft guide, the roller shaft guide and the stand and the like collide with each other due to the forward and backward movements of the shaft when the ball is hit with a racket and the rotation of the roller shaft guide. The tennis practice machine according to claim 1, further comprising: a shock absorber and a noise generator. 7. When not in use, the roller shaft guide is rotated about the support shaft to a position parallel to the stand so that the stand, the roller shaft guide and the shaft are housed in a parallel state. The tennis training machine according to claim 1.