JPH0355077A - Sole pressure detector - Google Patents

Abstract

PURPOSE:To provide a calculating means for calculating and outputting information associated with testee's gravity of center from the detecting output of a load cell and a movable sole pressure detector capable of grasping two- dimensionally and indicating the movement of the testee's center of gravity in the front, rear, right and left directions by indicating said information and measuring loads applied respectively to left and right feet. CONSTITUTION:A sole pressure detector has a footprint member 1 used to be attached to the lower surface of shoes or the like. The detecting information obtained from said detector to be applied to the left and right feet is sent through an A/D converter to a calculating means incorporated in a personal computer 2. This information, after calculation, is indicated on an indicating means such as CRT display 3, printer 4 or the like as desired data so that a trainee can see this indication and know the distributional situation of loads applied respectively to his own feet and the situation of load movement. The detected values of a pair of third load cells, i.e. CR3r, CR3l, CL3r, CL3l are respectively added to be detected as loads applied to the rear portions of feet so that the distributional condition in the front and rear of respective feet can be shown by % indication.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for detecting the load applied to the sole of a practitioner's foot in an arbitrary exercise posture, which is used to improve the practitioner's skills in the practice of various sports. Regarding plantar pressure detection devices. (Conventional technology) For various sports. The position of the athlete's center of gravity at each stage of an attempt has a close relationship with the result of the attempt, and is a very important factor in improving the athlete's skill.

For example, when practicing a golf swing, the subject's center of gravity shifts almost to the foot on the side of the golf ball at the time of impact, and the load due to changes in the acceleration of the object on the measurement system due to the movement of hitting the club down and the entire body weight is calculated. It is best that the entire weight you apply is on that foot. Furthermore, in skis and other equipment that change the direction of movement by shifting body weight, it is important for the athlete to perceive and memorize how the load is applied to the sole of the foot depending on the practitioner's posture. It will help you improve your skills.

In addition, practitioners can quantitatively know the state of their center of gravity movement when they are doing well, and when they fall into a slump, they can remember the state when they were doing well and understand the cause of the slump by comparing quantitative data. , By solving this problem, it may become easier to escape from the slump. Now, let's take golf as an example of a sports event. Conventionally, such golf swing training machines have been equipped with a load measurement system on which both feet are placed separately, on which the practitioner stands and performs a trial move. A device was known that could determine the state of weight movement based on the results. Here, the results of the trials were configured to either output the load from both the left and right feet as is, or display the distribution ratio of the load on the left and right sides. However, the detection target was limited to one-dimensional data in the left and right directions of the practitioner's body. In addition, these devices are relatively large, and their measurements are limited to quasi-static movements in which the practitioner's position does not change significantly. This means that it cannot be applied to activities that involve In addition, during swings in golf, batting, etc., the load generated on both feet changes depending on the stance, but until now there has been no device that takes this condition into consideration and detects the absolute value of the load and information on the movement of the center of gravity for each player. ．． On the other hand, shoes that measure plantar pressure have been developed for use in walking training for people with disabilities, but these require complicated equipment and are highly specialized and advanced, making them difficult to use on a daily basis. It was not intended for. (Problems to be Solved by the Invention) In view of the above-mentioned current situation, it is an object of the present invention to have a simple structure, to be easily attached to the sole of a practitioner's foot such as shoes, to be movable, and to be able to be used for both the left and right feet. Measure the load applied to each of the
The object of this invention is to obtain a plantar pressure detection device that can two-dimensionally capture the movement of the practitioner's center of gravity and display it in the front, back, left, and right directions of the body. A further objective is to obtain the above-mentioned load conditions on each foot in relation to stance settings. (Means for Solving the Problems) The first invention of the present application for solving the above problems has a sole pressure detecting device having a pair of upper and lower foot-shaped hard members, and between the members, a pair of left and right foot last members having load cells arranged at at least three points that can represent the left and right parts; a calculation means for calculating and outputting the subject's center of gravity related information from the detection output of the load cells; In the first invention, the information related to the center of gravity of the subject is displayed on each of the left and right foot last members. The absolute value of the applied load and the distribution ratio of the left and right loads to the sum of the left and right loads, the distribution ratio of the individual loads applied to the left and right foot last members in the subject's front and back direction within the member, This can be the distribution ratio of the inside and outside of the test subject's foot within the last member for each individual load applied to the last member.

Further, in the plantar pressure detection device of the present application, this is provided with a distance detection means for detecting the distance between a pair of left and right foot last members, and information related to the center of gravity of the subject is determined as the sum of all loads applied to the foot last members. In addition, it can also be configured to be the position in the front, rear, left, and right directions with respect to the subject under the full load. (Function) According to n4 of the first invention of the present application, the load applied to each of the left and right feet is received by the foot-shaped hard member on the upper surface side. Therefore, load information that is intricately related to the shape of the sole and the load position is represented here as a concentrated load acting on a single point of action on a hard member. The load redistributed to at least three load cells on the lower surface of this member is then detected. Here, since each of the load cells is arranged so as to cover the largest possible surface of the foot, the concentrated load value and its position inside each left and right foot can be determined relatively easily from these detected values. Naturally, the loads on the left and right feet can be obtained separately. These detected values are then sent to the calculation means and processed into weight-related information, and this information is displayed on the display means so that it can be easily checked by the subject. In the above-mentioned plantar pressure detection device, the load on the left and right feet is detected in two dimensions in the front, back, left and right directions of the exerciser, making it possible to do the following. That is, as weight-related information, the detected values in the first invention may be used as they are to output the absolute value and distribution of the load applied to the left and right legs, or the calculation means may perform arithmetic processing to calculate the load in the front-rear direction on each leg. It is possible to obtain the distribution and the load distribution ratio on the outside and inside of the foot. Now, if we consider the concentrated load mentioned above, it is the sum of the loads generated based on the position of the subject's weight and changes in the acceleration of the object above the measurement system. Therefore, for example, golf,
In an event such as baseball, for example, at the time of impact, the entire load is on the left foot, and the total load is slightly decreasing from the maximum load (at this time, the subject's body is trying to extend upward). It is thought that each person has decided on the specific point that is best for the impact inside. It became possible to know this specific point by obtaining the above-mentioned weight-related information. Further, if the plantar pressure detection device is equipped with a distance detection means so as to be able to detect the total sum of all loads applied to the last member and the position of the all loads as information related to the center of gravity of the subject, The load data that was previously detected only within each foot can now be calculated for the subject's position, and changes in load due to the movement of each foot based on stance or the movement of the club during swing can be calculated from the above data. You can know through In other words, it will provide a powerful resource for considering the optimal stance width to obtain the ideal center of gravity movement and impact for the person in question. Furthermore, if the structure is such that information can be processed and stored in real time, changes in the center of gravity during a single attempt can be reliably obtained as two-dimensional movement information. (Effects) By using the plantar pressure detection device as described above, it is possible to obtain more detailed information than conventional methods on the distribution of the load applied to each foot of the subject during exercise and the status of load transfer. can be done. On the other hand, in the above structure, the hard member takes the shape of the foot, so it can be attached to the bottom of the shoe, etc., or integrated with the shoe. Information can be obtained. (Example) Examples of the present invention will be described below with reference to the drawings. FIG. 8 shows an example in which the plantar pressure detection device is used for golf swing analysis.

This figure shows an example of the sole pressure detection device of the present application, which is a removable type that can be attached to shoes or the like.

That is, this sole pressure detection device has a foot-shaped member (1) that is attached to the bottom surface of a shoe, etc., and the detection information obtained from the foot-shaped member (1) for the left and right feet is sent via an A/D converter. After that, the information is sent to the calculation means built into the personal computer (2), and after undergoing calculation processing, this information is displayed as desired data on the CRT display (3).
This is displayed on a display means such as a printer device (4).The display is configured so that the practitioner can see the distribution of the load applied to each foot and the status of the load movement.

The data during one attempt is stored and processed continuously, so it is possible to retrieve the data at any point in time, and it is also possible to display and process all the data at once. It is side by side. For example, as shown in the figure, a head detector (S) may be provided at the ball position to detect the address start time and the impact time to determine the desired time.

The structure of the last member (1) will be explained in more detail below. As shown in Figures 1 and 2, the foot last member (1) of the plantar pressure detection device is a foot last hard member (1) formed into two plate-like lasts such as aluminum or plastic plates.
5) A small load cell (C) is sandwiched between them. Here, the small load cells (C) are arranged at at least three locations representing the front, rear, left and right portions of the foot. In addition, the load cell (
C) An elastic material (7) such as a rubber mat is attached to the mounting surface to cushion the shock, and one end of the foot-shaped rigid member (5) is equipped with a rubber mat to prevent the relative movement of the rigid member (5). The guide member (
8) is provided. (In the figure, this guide member (8)
is provided on the hard member (5) on the lower surface side. ) Now, next we will explain the installation position of the small load cell (C). As shown in Figure 1, the first load cell (
CRI) (CLI) is the head of the first metatarsal bone, the second load cell (CR2) (CL2) is the head of the fifth metatarsal bone, and the third load cell (CR3) (CL3) is the head of the femoral bone. It is configured to be placed in a part of the center. Here, as shown by the virtual line in FIG. 1, the third load cell (CR3
) (CL3) A pair of load cells (CR3r) (CL3r) (CR31) (
CL31) can also be used. When four load cells (C) are used in this way, the behavior of the upper foot-shaped rigid member (5) is stabilized. Here, as shown in FIG. 3, the position of each load cell in the example is set at the center of each foot as the origin, and the coordinate values for the right foot are expressed as shown in Table 1. Table 1 CRI CR2 CR3r CR31Xi-3.
1 2. 7 2. 0 2. OYi 8.0
6.4 -8.8 -8.8 (cm) The coordinates of each load cell (C) above regarding the foot center axis (X, Y) and the load applied to each are (Xi, Yi), Ti
(i=1, 2, 3), the load value (W) as a concentrated load and its action position 1j (Xw
, Yw) can be obtained very easily as follows. Concentrated load value; W = ΣTi (i = 1, 2, 3) Load position ;) Cw = ΣT i * X i / WY w =
ΣT i * Y i / W (i=1,
2, 3) Here, even if four or more load cells (C) are provided, the above relational expression does not change. Next, the method of obtaining the load distribution within each foot, which is the purpose of this application, from the data obtained above is shown below.
As shown in the figure, the distance from the center of each foot to the tip or rear end of each foot is YL, and the distance to the left and right ends is XL. Here, the front and rear load distribution within each foot (Yf%, Yb
%) is obtained by the following formula. Yf %=50*Yw/YL+50 Yb%=100-Yf % Similarly, medial and lateral load distribution within each foot (Xi
%, Xo%〉 can be obtained by the following formula. Xo%=50*Xw
/XL+50 Xi %=100-Xo % Furthermore, instead of using the position of the concentrated load determined as above as data, four load cells (C) are provided as described above, and the first and second load cells ( (CR
The detected values obtained by I
))． The detected values obtained by ((CL3r) (CL31)) are added to detect the load applied to the rear part of the foot, and by displaying this as a percentage, it is also possible to show the front and rear distribution state of each foot. A similar method can be applied to calculate the distribution inside and outside, and in this case, one of the first load cell and the third load cell ((CRI) (CR31)
), (CLI) (CL3r)), the load applied to the inner side of the foot is calculated by one of the second and third load cells ((CR2) (CR3r)), (CL2) (CL3).
1) This is possible by detecting the load applied to the outside of the foot using the detected value. The reason why such a simple processing method can be used is because the distance between the cells is relatively small and the amount of displacement of the hard member 5> is uniform. Next, the output by the display means of the center of gravity related information obtained by the above processing will be explained.

As shown in Fig. 4, the display means displays data at a desired point in time, including the distribution ratio of the load applied to the left and right feet, the distribution ratio of this load in the front-rear direction of each foot, and the distribution ratio of the inner and outer parts of the foot. Displayed along with the display. This allows the practitioner to know at a glance the distribution ratio of the load applied to each foot at a desired point in time. Furthermore, if the Yf% and Xo% values found earlier are further multiplied by a correction coefficient to hypothetically express the appropriate position of the foot as 0% and 100%, the practitioner will be able to intuitively understand the load position. This has the effect of making it easier. Next, as a preferred example of implementation of the present application, as shown in FIG.
) is equipped with a distance detection device (9) as a distance detection means for detecting the distance between them.
9) may be a linear encoder. Now, this distance detection device (9) is capable of detecting the distance between the two foot mold members (1) and the angle from the central axis (X, Y) of each of the foot molds. It has a unique structure. With this structure, center-of-gravity-related information, which until now has been processed separately for the left and right feet, can be analyzed from the relationship with the front, back, left, and right directions of the subject's body.

Then, by sequentially determining the state of the subject's center of gravity movement, the trajectory of the center of gravity movement (Xw, Yw) during the trial is displayed. An example of this is shown in FIG. Here, the solid line a indicates the positions of the left and right feet, and the solid line indicates the locus of movement of the center of gravity.

Furthermore, in Fig. 7, the load distribution at a desired point during the attempt in Fig. 6 is displayed in the order of the attempt. Here, point A is the address start position, point B is the backswing completion position, and point C is the backswing completion position.
The point is the position where the center of gravity transitions most forward during the downswing, D
The dot indicates the position where the load is most applied to the left foot, and the ■ point indicates the impact position. By the way, the golf swing is I.
Ideally, the point coincides with point D. The state of emphasis movement at each point can be output individually and sequentially as shown in Figure 4, or the state of each point can be output all at once together with the output diagram of the center of gravity movement described above. It is also considered. This is shown in FIG.

In this device, only the last member (1) is attached to the bottom of the shoe like a crampon, as shown in Figure 8, and the calculation means (2), display means (3), and (4) are placed separately. Alternatively, the foot last member (1) may be equipped with a memory to store data during the attempt, and display information related to the center of gravity after the attempt. Furthermore, it is also possible to provide the display device of the device of the present application integrally on the foot last member (1). In this case, the display device may be an elliptical display that emits only the high-pressure parts of the distribution obtained as a result of calculation. Of course, this device may be constructed in the form of a shoe or the like, and the output from the display means may also be expressed as a bar graph or the like instead of numerically as described above. Note that although numbers are written in the claims section of the present invention for convenient comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment according to the present application, and FIG. 1 is a front view of the last member of the sole pressure detection device. FIG. 2 is a surface measurement of the last member. FIG. 3 is a coordinate system of the last member. FIG. 4 is a diagram showing the display state of the display device, FIG. 5 is a diagram of the device equipped with distance detection means, FIG. 6 is a diagram showing the display output of the center of gravity movement trajectory, and FIG. 7 is a diagram showing the display state of the display device. FIG. 8 is a diagram showing an output example in which multiple load distribution states are displayed at the same time.

Claims (1)

[Scope of Claims] 1. A pair of upper and lower foot-shaped hard members (5) (5), and load cells (C ), a pair of left and right foot last members (1), and a calculation means (
2); and display means (3) and (4) for displaying the subject's center of gravity related information output from the calculation means. 2. The plantar pressure detection device according to claim 1, wherein the subject's center of gravity related information includes the absolute value of the load applied to the left and right foot last members, and the load on the left and right with respect to the sum of the left and right loads. Plantar pressure detection device that is a distribution ratio. 3. The sole pressure detection device according to claim 1, wherein the subject's center of gravity related information is a distribution ratio in the subject's front and back direction within the member with respect to individual loads applied to the left and right foot last members. Pressure detection device. 4. The plantar pressure detection device according to claim 1, wherein the subject's center of gravity related information is based on the distribution ratio of the inside and outside of the subject's foot within the member with respect to individual loads applied to the left and right foot last members. A plantar pressure detection device. 5. The plantar pressure detection device according to claim 1, further comprising distance detection means (9) for detecting the distance between the pair of left and right foot last members (1), and information related to the center of gravity of the subject. , a plantar pressure detection device that is the sum of all loads applied to the last member and the position of the full load in the longitudinal and lateral directions with respect to the subject; 6. The plantar pressure detection device according to any one of claims 1 to 5, which is configured to be capable of outputting information related to the center of gravity of the subject at any time when the subject is in a desired exercise posture, and wherein the display means ( 3) The plantar pressure detection device according to (4), wherein information related to the center of gravity of the subject is sequentially displayed at the desired time points. 7. The plantar pressure detection device according to any one of claims 1 to 5, which is configured to be able to output information related to the center of gravity of the subject at any time when the subject is in a desired exercise posture, and the display device ( 3) The plantar pressure detection device according to (4), wherein information related to the center of gravity of the subject is displayed at the same time for all the desired time points. 8. The sole pressure detection device according to claim 1, wherein the last member (1) is attachable to the bottom of a shoe. 9. The sole pressure detecting device according to claim 1, wherein the last member (1) is formed integrally with the sole of a normal shoe. 10. A plantar pressure detection device according to any one of claims 1 to 9, which is used as a golf swing diagnostic device.