JP2644688B2 - Golf swing diagnostic machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top plate on which a subject is to be placed and which is disposed below the periphery of the top plate to support the top plate.
A plurality of load cells, a load measuring table for measuring a load of the subject during a swing from a detection output of the load cell, a calculating means for determining a load center position of the subject from an output of the load measuring table, and the load center. The present invention relates to a golf swing diagnostic machine provided with a display device for displaying a position in a two-dimensional plane.

[0002]

2. Description of the Related Art It is well known that the form is important for a golf swing, but the movement of the center of load, that is, the so-called weight shift, is also an important factor. Conventionally, the display panel of the display device is configured such that a standard pattern on which the locus of the load center position used for comparison is drawn or pasted can be inserted, and the locus of the subject's load center position is displayed on the display plate of the display device. It was configured to display. Then, the standard pattern is inserted or affixed to the display board, the locus of the load center position by the test of the subject is displayed on the display board, and the two are compared to diagnose the quality of the swing. See, for example, JP-A-50-26571.

[0003]

As a result of research, the weight shift during a golf swing has been researched. From the address to the backswing, the load center position shifts linearly from the center of both feet to the right foot. From the downswing to the impact, the load center position moves toward the left foot while slightly hung on the toe rather than at the time of address, so that the trajectory of the load center position expands forward, and later the load center position moves backward again It has been found that the load center position at the moment of impact should be on the line connecting the centers of the left and right feet on the leftmost side of the trajectory. In particular, the load center position at the moment of impact is an important indicator of the swing quality. Therefore, the load center position at the moment of impact when the subject performs a trial is determined by the standard load center set as a standard pattern such as an ideal load center locus.
If it can be compared with the trajectory, it will be extremely effective in diagnosing the quality of the swing. However, since the subject cannot observe the display device at the moment of the impact, the conventional golf swing diagnostic device specifies the load center position at the moment of the impact on the locus of the subject's load center position displayed on the display panel. Can not do it. Therefore, in the conventional golf swing diagnostic machine, the load center position at the moment of impact when the subject performs a trial cannot be compared with the standard load center locus . Accordingly, an object of the present invention is to provide a golf swing diagnostic apparatus that can compare a load center position at the moment of impact when a subject performs a trial with a standard load center locus .

[0004]

A first characteristic configuration of the golf swing diagnostic apparatus according to the present invention is a standard pattern.
Storage means for storing data of standard load center trajectory set Te, head detector is provided for detecting the impact point, the display device, the stored in the storage means
The configuration is such that the standard load center locus and the load center position at the time of impact detected by the head detector are displayed.

[0005] A second characteristic configuration is that the calculating means uses the data on the stance and the foot length of the subject to calculate the standard load.
It is configured to correct the heart trajectory .

A third characteristic configuration is that the display device is configured to superimpose and display the position of the subject's foot obtained by allowing the subject to take a posture on the load measuring table. .

[0007]

The operation of the first characteristic configuration is as follows. The subject holding the golf club stands almost at the center of the load measuring table, and hits the golf ball set on the tee in front of the table. At this time, the time of impact is automatically detected by the head detector, the load center position at the time of impact is calculated by the calculating means, and the result is calculated as CR.
2 such as T, liquid crystal display or plasma display
It is displayed on the dimensional display device. At this time, the display device
A standard putter such as an ideal load center locus stored in the storage means together with the load center position at the time of impact
The standard load center locus set as the load is displayed on the display device.

The center of the load on the subject is obtained by the calculation means as follows. That is, since at least three load cells installed at the corners of the load measuring table are fulcrums of the top plate, when a load is on the top plate, the center of gravity of the load is apportioned by the distance between the fulcrums. The load is applied to each load cell. Therefore, the load of the subject can be directly calculated by using the output of the load cell in which the load of the table itself is corrected in advance, and if the respective detected outputs are proportionally distributed in reverse, the load center position is obtained in a form projected on a horizontal plane. . For example, when the load cell is installed at the four corners of a square table, the position of the center of gravity projected on the table is given by performing a simple proportional operation using the respective outputs. Further, since the installation position of the load cell is not at the exact symmetric position, the initial load applied to each load cell is different, and if the degree of output change is different when the load is applied, an output compensation value given in advance, By adjusting the weight coefficient value, the projection position of the correct center of gravity can be obtained. Since this calculation is extremely easy for the machine calculation means provided in the calculation means, even when the subject moves on a table, the calculation result can be obtained almost in real time. Here, the load cell is a converter for measuring a force or a load, the output of which is an electric signal, and those having various principles have been put to practical use.

By the way, the standard load used for comparison is
The shape of the heart trajectory varies depending on the swing conditions. According to the second feature configuration, the standard load center trajectory stored in the storage means is corrected by the arithmetic means so as to conform to the subject's swing conditions using the subject's stance and foot length data. You. By the way, the standard load center trajectory used for comparison is generally similar to the reference shape by fully deforming the reference shape so as to fit the full stance in the lateral direction and the full width of the center of gravity when the center of gravity is applied in the front direction. It can be adequately adapted to the subject's swing conditions.

According to a third feature configuration, the display device includes:
The positions of the feet of the subject obtained by making the subject take a posture on the load measuring table are displayed in an overlapping manner. If the subject takes a stance on the load measuring table and stands as if to deposit weight on each foot as it is, the position where the subject stands is determined, and from the position of the center of gravity when the subject leans forward and backward Since the foot length is known, the position of the foot can be displayed on the display device in an overlapping manner.

[0011]

Therefore, the subject cannot observe the display device at the moment of impact, but according to the first characteristic configuration, the display device displays the load center position at the time of impact and the standard load center locus. After the swing, the subject, after the swing, based on the display result of the display device, the load center position at the time of impact in his or her swing, the standard
Compare with the load center locus to judge the quality of your swing.
Can be specified. Further, according to the second characteristic configuration,
There is no need to prepare many standard load center trajectories .
The standard load center trajectory can now be adapted to the swing conditions to be tried easily. By the way, conventionally, it is necessary to prepare a standard pattern according to various swing conditions, and the preparation work is complicated.Moreover, each time a subject performs a trial under different swing conditions, a standard pattern corresponding to the swing condition is created. It is necessary to insert or attach to the display board, which is troublesome. According to the third characteristic configuration, it is possible to evaluate the positional relationship between the positions of both feet when the subject actually takes the posture of the swing, the standard load center locus, and the load center position at the time of impact. The quality of the swing can be accurately determined.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a golf swing practice machine according to the present invention will be described in detail with reference to the drawings showing embodiments. FIG. 1 is a plan view showing an arrangement relationship between a load measuring table and a head detector in one embodiment of the present invention, and FIG. 2 is an elevation view thereof. FIG. 3 is a drawing showing a display example of the display device of the present invention. FIG. 4 is a configuration example of a golf swing diagnostic device, and FIG. 5 is a signal block diagram thereof.

In the present invention, a tea stand 25 is provided in front of the load measuring table 1. The load measuring table 1 has 4
A top plate 11 having four corners supported by load cells 12, 13, 14, 15 is provided. At the position where the golf ball is set on the tee stand 25, a light receiver 21A is provided on the near side of the club head passage, and a corresponding light projector 21B is provided on the other side, and the passage of the club head is detected and the moment of impact is detected. And a head detector 2 having an impact detector 21 for detection.

The subject has a club and the load measuring table 1
Above, stand almost in the center of the top plate 11 and take a stance. Load cells 12, 13, 14, 1 at four corners of load measuring table 1.
5, the outputs W1, W2 and 5 are obtained because the top plate load is offset in advance by zero adjustment in the load converter 16.
The total WT of W3 and W4 is the weight of the subject on the top board 11. Further, at this time, the output ratio of each load cell differs depending on the relationship between the position where the load is applied and the installation position of the load cells 12, 13, 14, and 15. By calculating backward from this, the position where the position of the load center of gravity is projected on the horizontal plane is obtained. I understand. The four load cells 12, 13, 14,
If 15 is located exactly at the four corners of the square,
The left-right component X and the front-rear component Y of the barycentric position expressed with the load cell 12 at the upper left corner in the drawing and the interval between the load cells as a unit are as follows: X = (W2 + W3) / WT Y = (W3 + W4) / WT Can be obtained from Load cells 12, 13, 1
Even when the arrangement of 4 and 15 is not square, the position of the center of gravity can be calculated by introducing a geometrically determined correction coefficient unique to each arrangement. In addition,
It is clear that it is only necessary to measure the load at three places on the plane to calculate the position of the center of gravity, so if three load cells are installed, it is necessary to add it, but the calculation for the calculation is complicated. I hate to be.

When the subject swings and moves on the load measuring table 1, each load cell output fluctuates accordingly. Each output W1, W2, W3, W4 is a load converter 16 provided with a measuring bridge circuit and an A / D converter, calculates a load measurement value compensating for the weight of the top plate 11, digitally converts and outputs, These are sequentially taken into the arithmetic unit 3 via the I / O interface 32. The center of gravity X, Y of the subject can be tracked by the arithmetic processing means 31 in the arithmetic unit 3 while calculating according to the above equation. The result is displayed on the two-dimensional screen display device 4 via the I / O interface 32 as needed, so that the subject can see the result during the swing. The control console 34 is used for management of operation programs and setting of measurement parameters.

FIG. 3 shows an example in which the current position of the center of gravity is superimposed on a plane projection view of a typical center of gravity locus. The positions of the left foot LF and the right foot RF are indicated by dotted lines. The foot position is
It can be determined very easily if it corresponds to the position drawn in advance on the top plate 11, but it is determined from the load measurement result when the subject deposits weight on only one leg at the position where the subject actually took the stance. You can also.

When analyzing from the results of the attempts of many players, the locus of the center of gravity when a preferable swing is performed is as follows.
When the stance is initially taken, the center of gravity is almost at the midpoint A between the right and left feet, and when the backswing starts, it moves almost linearly toward the right foot RF, and reaches around the inside of the right foot RF. Is the rightmost end B, and then enters the downswing. During the downswing, the center of gravity is slightly applied to the toe, and the locus of the center of gravity draws a gentle arc forward while moving to the left. This arc has the shape which is most inflated at the front position C of the body, returns again toward the front as the club head approaches the tee position, and at the leftmost end D of the arc, around the center of the left foot LF, the left and right feet. Reach the line connecting.
It is preferable to make an impact here. In the follow swing after the impact, the center of gravity trajectory ends with a natural small circle drawn inward and backward of the left foot LF.

The above is a typical locus of center of gravity. Even when clubs and flight distances are different, there is no significant change in the basic pattern. If the X direction of the standard pattern is extended to the stance width DS and the Y direction is extended to almost half of the foot length W, the ideal pattern almost matches this, regardless of the club difference. Here, the foot length W is the difference between the position of the center of gravity in the front-rear direction when the weight is hung forward and the weight is hung rearward in the posture in which the stance is taken. Therefore, the standard load the standard pattern
The center locus is stored in the internal storage means 33 or the external storage device 35, read out as necessary, corrected with the data of the subject's stance width DS and foot height W, and displayed on the display device 4. If the position of the center of gravity P is drawn on top of this, it is possible to clearly know the defect of the own swing posture and correct it.

Although the subject cannot observe the display device 4 at the moment of the impact, the impact detector 21 installed at the tee position detects the moment when the head has passed or the ball has disappeared, so that the moment of the impact is detected. The subject is automatically detected, and the center of gravity position I at this time is displayed on the display device 4 and is kept displayed until reset, so that the subject can judge pass / fail after seeing this after the swing. I can do it. When a switch 23 is provided at an appropriate position on the head detector 2 and the reset instruction signal is transmitted by touching with the club head,
This is convenient because the subject can operate without changing the stance posture.

The strictly optimal locus, for example, the locus at which the head speed is maximized, varies somewhat depending on the person and the conditions. For some trajectories during a downswing, it is better to form a wide-base triangle having vertices instead of a gentle arc. Of course, the optimum pattern changes depending on the number of the club that swings and the flight distance to be aimed at. As described above, although the optimum pattern changes depending on the condition depending on the person, the center of gravity trajectory of the person under his / her best swing under certain conditions is reproducible. It is a good indicator to see if you are on a swing. Therefore, when the best swing that the subject wants to try and use as his or her standard is recorded as a center of gravity locus in the storage means such as the internal storage means 33 or the external storage device 35. When measuring and displaying a swing, selecting an appropriate trajectory and displaying it in the same way as above, not only improving the skill of the player, but also adjusting the tone just before playing Become a useful device.

In the above diagnosis, the relationship between the address start point position A and the left and right foot positions RF and LF, the center of gravity movement locus BS of the backswing, and the relationship between the forward displacement H of the center of gravity during the downswing and the foot height W. It has been known that the use of indices such as the center of gravity return width FS of the follow swing and the position of the center of gravity I at the time of impact can well represent the characteristics of the swing. Therefore, the swing may be evaluated using these indices. For example,
When the center of gravity moves to near the outside of the right foot RF and the center of gravity of the backswing moves too long, sway occurs. Therefore, it is necessary to practice to stop inside the foot, and the locus of the center of gravity of both feet RF and LF. When the lateral length of the center of gravity trajectory is small because it is not widened to the left and right at the middle part of, the downswing begins before the weight is shifted to the right in the backswing, and the weight is reduced to the right foot RF even after the impact It is necessary to increase the weight shift a little more because it indicates that the weight remains.

In the above description, the apparatus and the orientation of the body are limited to the left and right, but it goes without saying that the left-handed subject can be used as it is if the head detector 2 is arranged in reverse. Also, in the description of the claims, reference numerals referring to the drawings are appended, which are attached for the purpose of understanding, and do not limit the technical idea of the present invention. Needless to say.

[Brief description of the drawings]

FIG. 1 is a plan view of a golf swing diagnostic device.

FIG. 2 is a side view of a golf swing diagnostic device.

FIG. 3 is a diagram showing a display example of a display device in a golf swing diagnostic machine.

FIG. 4 is a perspective view of a golf swing diagnostic device.

FIG. 5 is a block diagram of a golf swing diagnostic device.

[Explanation of symbols]

Reference Signs List 1 load measuring table 2 head detector 3 calculation means 4 display device 11 top plate 12, 13, 14, 15 load cell 33, 35 storage means DS stance I load center position at impact P load center position W foot length W1, W2 W3, W4 Detection output WT load

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Kimura 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Inside Kubota Technology Development Laboratory Co., Ltd. 1975-26571 (JP, A) 2-82373 (JP, U)

Claims (3)

(57) [Claims] 1. A top plate (11) on which a subject is placed and three or more load cells (12), (13), (13) arranged below the periphery of the top plate (11) and supporting the top plate (11). 1
4) and (15) are installed, and the load cell (1) is installed.
2), (13), (14), and (15) detection outputs (W
1) A load measuring platform (1) for measuring the load (WT) during the swing of the subject from (W2), (W3), and (W4), and the load center position of the subject based on the output of the load measuring platform (1). A golf swing diagnostic machine provided with a calculation means (3) for obtaining (P) and a display device (4) for displaying the load center position (P) in a two-dimensional plane, which is set as a standard pattern. A storage means (33) or (35) for storing data of the standard load center trajectory , and a head detector (2) for detecting a point of impact are provided. The display device (4) is provided with the storage means (33) or (3
A golf swing diagnostic machine configured to display the standard load center locus stored in 5) and the load center position (I) at the time of impact detected by the head detector (2). 2. The method according to claim 1, wherein the calculating means (3) uses the data of the subject's stance (DS) and foot length (W) to calculate the standard load.
The golf swing diagnostic device according to claim 1, wherein the golf swing diagnostic device is configured to correct the center-of-gravity locus . 3. The display device (4) is configured to superimpose and display the position of the subject's foot obtained by allowing the subject to take a posture on the load measuring table (1). 1
Or the golf swing diagnostic device according to 2.