JP2003240630A - Gravicoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure easily and accurately which position on the ground contact face of a foot or a shoe is the position of the center of gravity of a subject. <P>SOLUTION: In this gravicoder, two or more load sensors L<SB>1</SB>, L<SB>2</SB>, R<SB>1</SB>, R<SB>2</SB>working as load detectors 2 for measuring the position of the center of gravity are arranged respectively on the tiptoe side and the heel side between a step 3 for loading thereon both feet and a base plate 4. The load sensors L<SB>1</SB>, R<SB>1</SB>arranged at least either of the tiptoe side and the heel side are positioned adjustably in the front-to-back direction so that the front-to-back sensor intervals agree with the sizes of the feet or the shoes. The gravicoder is also equipped with an operation device 15 for calculating the front-to-back position of the center of gravity based on the detected load by the load sensors L<SB>1</SB>, R<SB>1</SB>arranged on the tiptoe side and the detected load by the load sensors L<SB>2</SB>, R<SB>2</SB>arranged on the heel side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center of gravity for measuring where the center of gravity is located on the ground contact surface of a foot or shoe.

[0002]

2. Description of the Related Art It is said that, ideally, the center of gravity before and after standing of a person is 47% from the heel to the toe direction. The position of the center of gravity is one of the most important factors when playing competitions and sports, and in particular, skis slide freely on the snow surface by manipulating a ski through ski boots by moving the center of gravity. Therefore, if the shift of the center of gravity cannot be accurately transmitted to the ski, the ski cannot be skied well.

For this reason, skis and ski boots have
The ideal load point (center of gravity) for exhibiting its performance is marked. If it is worn out of this load point, it will not slip easily and will adversely affect the competition results, as well as cause accidents and injuries.

Therefore, in order for athletes to exert their abilities to the fullest and for beginners to enjoy skiing more safely, it is necessary to match the centers of gravity of the ski boots and skis. This adjustment involves adjusting the binding. Can be done easily.

However, whether or not the center of gravity of a person coincides with the load point of the ski boot is measured at the laboratory level, but not at a general ski equipment store. There wasn't.

As a device for easily measuring such a center of gravity, a center of gravity meter as shown in FIG. 6 has been proposed (Japanese Unexamined Patent Publication No. Hei 3)
(See Japanese Patent Publication No. 244438). The center of gravity 31 includes three load sensors S arranged at the apexes of a triangular step 32.
_The position of the center of gravity is measured based on the detected loads P _{1 to} P ₃ of _{1 to} S ₃ , and the XY coordinate with the position of the load sensor S ₁ as the origin is assumed, and the position of the center of gravity (Gx, Gy) corresponds to the weight. It is assumed that the concentrated load of
The position of the center of gravity is calculated by the following formula from the balance of the moments in the directions. _{Gx = (P 2 -P 3)} x 0 / W .................. (1) Gy = (P 2 + P 3) y 0 / W .................. (2) x 0: the load sensor from the origin Distance in the X direction to S ₂ and S ₃ , y ₀ : Distance from the origin to the load sensors S ₂ and S _{3 in} the Y direction. Can be calculated relatively easily.

[0007]

However, since the position of the center of gravity that can be obtained by the above method is merely the XY coordinates virtual on the step, where the center of gravity is located on the ground contact surface of the foot or shoe. It was extremely difficult to judge whether there was something. In addition, the pedestal 3 along the Y-axis of the XY coordinates
If the center line is drawn at 2, the left and right standing positions can be made substantially constant with respect to the load sensors S _{1 to} S ₃ , but the standing position in the front-rear direction depends on the size of the foot or shoe or the step 32. Since it changes depending on the position at which the load is applied, if these changes, the detection load of each of the sensors S _{1 to} S ₃ will be different, and it has been difficult to grasp the accurate position of the center of gravity.

FIG. 7 shows the Y direction in the conventional center of gravity measurement.
It is explanatory drawing which shows the model of load distribution. The weight of your feet and shoes
The center of gravity of the sole is assumed, assuming a distributed load that acts on the entire ground contact surface.
Assuming that the table is at the position of g% from the heel to the toe,
Sensor S₁The distance from the toe to d₁, Foot or shoe size
Is df, the load sensor S from the heel_TwoAnd S_ThreeDistance to d
_TwoThen, the load sensor S_TwoAnd S_ThreeDetection load P_Two,
P_ThreeIs the sum of P_Two+ P_Three= (W / y₀) [D₁+ Df (100-g) / 100] ... (3) The Y-direction center of gravity position Gy is Gy = (P_Two+ P_Three) Y₀/ W = D₁+ Df (100-g) / 100 (4) It is represented by.

That is, the Y-direction center of gravity position G on the step 32
Since y varies depending on the distance d ₁ that varies depending on the standing position, the size df of the foot or shoe that differs depending on the individual, and the center of gravity position g from the heel, the load detected by the load sensors S _{1 to} S ₃ does not necessarily vary from the heel. It does not reflect only the gravity center position g.

This is because most of the conventional center-of-gravity measurements detect the amount of sway of the center of gravity to detect a bad posture, poor physical condition, nervous disorder,
Since it is intended to judge the modulation of the balance function, the imbalance of muscle strength, the mental load, the influence of the drug, the digestive system abnormality, etc. based on the sway of the center of gravity, it is sufficient if it can be represented by the XY coordinates on the step 32. This is because it is not necessary to know which position on the ground contact surface of the foot or shoe has the center of gravity.

Therefore, it is a technical object of the present invention to make it possible to easily and accurately measure the position of the center of gravity of the subject on the ground contact surface of the foot or shoe.

[0012]

In order to solve this problem, the present invention relates to a center of gravity meter for measuring the position of the center of gravity based on the detected load of a load detector arranged between a step on which both feet are placed and a base plate. , The load detector is composed of two or more load sensors arranged on the toe side and the heel side, respectively,
At least one of the toe side and heel side load sensors is arranged so that the front and rear position can be adjusted, and the front and rear based on the load detected by the load sensor arranged on the toe side and the load detected by the load sensor arranged on the heel side. Is provided with an arithmetic unit for calculating the position of the center of gravity of the.

According to the present invention, the load detectors are arranged on the toe side and the heel side, for example, the toe side load sensor is arranged so that the front and rear position can be adjusted, and the heel side load sensor is arranged at the fixed position. Has been done. Here, the load sensor on the toe side is moved according to the size of the foot or shoe, the front and rear sensor intervals are made equal to the size of the foot or shoe, and the position of the toe and heel is adjusted to the position of each load sensor. If both feet are placed on the step, the positional relationship between the standing position and each load sensor is always constant regardless of the size of the foot or the shoe.

Then, both feet are placed on the step, and the front and rear center of gravity positions are calculated based on the load detected by the load sensor arranged on the toe side and the load detected by the load sensor arranged on the heel side. Since the size of is equal to the front and rear sensor spacing, for example, when the size of the foot or shoe is 100%,
It is possible to accurately detect, without error, what percentage of the center of gravity is in the direction from the heel toward the toe. Here, the weight can be calculated based on the total value of the detected loads of the load sensors as in the invention of claim 6.

According to the second aspect of the present invention, by providing a scale indicating the front and rear sensor intervals on the toe side and the heel side, the position of the load sensor can be easily adjusted by matching the interval of the load sensor with the size of the foot or shoe. Can be adjusted.

According to the third aspect of the present invention, if a total of four load sensors are provided, one on each of the left and right sides, based on the detected loads of the left and right pair of front and rear load sensors and the detected loads of the right and left pair of front and rear load sensors. The left and right center of gravity positions can be detected.

If the step is separated into the left foot mounting base and the right foot mounting base as in the fourth aspect of the invention, the left foot mounting base and the right foot mounting base are respectively supported by the front and rear load sensors. Therefore, the weight and the position of the center of gravity can be accurately detected without arranging all the four load sensors at exactly the same height.

Furthermore, if the step is separated into a left foot mounting base and a right foot mounting base, the left foot and the right foot can be respectively detected based on the outputs of the left and right front and rear load sensors as in the invention of claim 5. The front and rear centroid positions can be calculated individually.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a perspective view showing an example of a center of gravity meter according to the present invention, FIG. 2 is an explanatory view showing a load distribution model at the time of measurement, FIG. 3 is an explanatory view showing an example of display contents, and FIG. 4 is a calculation processing procedure. The flowchart shown in FIG. 5 is an explanatory view showing another embodiment.

The center of gravity meter 1 of this example comprises a center of gravity meter body 1A having a weight detector 2, and a calculation section 1B for calculating and displaying the center of gravity position and weight based on the load detected by the weight detector 2.

The body of gravity center 1A comprises a load detector 2 sandwiched between a base 3 and a step 3 on which both feet are placed.
The guide cylinder 6 arranged on the back surface of the step 3 is externally fitted to the guide column 5 standing on the base plate 4, and the step 3
Is displaced only in the vertical direction with respect to the base plate 4. The load detector 2 includes a total of four load sensors L ₁ , L ₂ , R ₁ and R ₂ arranged in pairs on the toe side and the heel side, respectively, and an infrared ray calculating unit 1B for detecting the respective detected loads. A transmitter 7 for wireless transmission is provided.

A pair of load sensors L ₁ and R ₁ arranged on the toe side are attached to a sensor holder 9 whose position is adjusted back and forth by an adjusting screw 8 and a pair of load sensors L ₂ and R on the heel side. ₂ is arranged in a fixed position.

The step 3 has front and rear loads on the toe side and the heel side.
Sensor L₁, R₁And L _Two, R_TwoThe sensor interval of
A scale 10 is provided and the scale 10 is graduated.
An index 11 pointing to is formed on the sensor holder 9
There is. As a result, the sensor holder 9 is fixed by the adjusting screw 8.
If you move it back and forth, the sensor interval will be adjusted by the scale 10.
Can be read and the index 11 is on the foot or foot of the subject
If you adjust the position to indicate the size of your shoes,
Sensor L₁, R₁And L_Two, R_TwoThe sensor interval is
Matches the size of the shoe.

Further, on the step 3 there are left and right load sensors L.
₁And L_Two, R₁And R _TwoCenter of the center of
Line 12 is drawn back and forth, with feet on the heel side
The pad plate 13 for determining the position to be set is provided, and the pad plate 1
When the rear end of the heel is brought into contact with the load sensor L_Two, R_Two
The heel is positioned at the mounting position of.

Therefore, if the heels of both feet are placed on the step plate 3 with the heels of both feet being in contact with the foot plate 13 with the front and rear sensor intervals adjusted to the size of the foot, as shown in FIG. The load sensors L ₁ , R ₁ and L ₂ , R ₂ are always arranged at positions corresponding to the tip of the toe and the rear end of the heel, regardless of the size of the load.

The calculation unit 1B includes load sensors L ₁ , L ₂ , transmitted from the transmitter 7 arranged in the center of gravity meter body 1A.
A receiver 14 that receives the detection loads of R ₁ and R ₂ , a calculation device 15 that calculates the weight and the center of gravity position based on the detection loads, and a liquid crystal display 16 that displays the calculation results.
Is equipped with. In this example, the center of gravity position is the front and rear center of gravity position Gy in which the distance from the heel to the toe direction is displayed in%,
The deviation amount (rightward +) from the center line 12 is represented by the left and right center of gravity position Gx displayed in mm.

At this time, the load distribution in the y-axis direction is shown in FIG.
As shown in (a), 100% from heel to toe
The center of gravity Gy when the load sensor L₁, L_Two,
R ₁, R_TwoIt is directly reflected in the detected load of. In addition,
If both feet are placed with the center line 12 in between,
The load distribution is as shown in Fig. 2 (b).
The degree of unbalance is the load sensor L₁, L_Two, R₁, R
_TwoIt is reflected in the detection load of.

At this time, the load sensors L ₁ , L ₂ ,
Assuming that the detected loads of R ₁ and R ₂ are m ₁ , m ₂ , n ₁ and n ₂ , respectively, the weight W, the front and rear center of gravity position Gy, and the left and right center of gravity position Gx
Are respectively calculated by the following equations. W = m ₁ + m ₂ + n ₁ + n ₂ [kg] Gy = {(m ₁ + n ₁ ) / W} × 100 [%] Gx = p {(m ₁ + m ₂ ) − (n ₁ + n ₂ )} / ( Two
W) [mm] where p: left and right sensor spacing [mm]

FIG. 3 shows an example of a display screen of the liquid crystal display 16, in which a weight display section 17 is formed on the upper side and a center of gravity position display section 18 is formed on the lower side. The weight display unit 17 displays the calculated weight W as a numerical value. The center-of-gravity position display unit 18
A graph display unit 19 that displays the foot and the center of gravity position by coordinate points (Gx, Gy), and the front and rear center of gravity position Gy and the left and right center of gravity position Gx
Is provided with numerical value display sections 20 and 21 for numerically displaying.
The graph display unit 19 displays XY coordinate axes 19x and 19y whose origin is the ideal center-of-gravity position, and left and right foot figures 19f. This X coordinate axis 19x is Gy
= 47%, and Y coordinate axis 19y is center line 1
Matches 2.

FIG. 4 is a flow chart showing the processing procedure of the arithmetic unit 15. When a switch (not shown) is turned on, execution of the process is started. First, at step STP1, 0 is performed based on the load detected by each load sensor L ₁ , L ₂ , R ₁ , R _2.
Match the points. In this process, the detected load when no load is applied to the step 3 is regarded as 0, and the measurement error is offset.

When the process of step STP1 is completed, the process proceeds to step STP2 and the weight display of the liquid crystal display 16 is set to "0.0", indicating that the preparation for measurement is completed.

Then, in step STP3, the load sensors L ₁ , L ₂ , R ₁ , R are placed on the step 3 by placing both feet on them.
_It waits until the detected load from ₂ is input, and when input, the process proceeds to step STP4 to calculate the weight W, the front-rear center of gravity position Gy, and the left-right center of gravity position Gx by the above formula.

Next, in step STP5, the calculation results of the weight W, the front-rear center-of-gravity position Gy, and the left-right center-of-gravity position Gx are displayed on the liquid crystal display 16 as shown in FIG. 3, and the process ends.

The above is one example of the configuration of the present invention, and its operation will be described below. For example, when trying to measure the position of the center of gravity, the toe-side load sensor L ₁ is adjusted by the adjusting screw 8 so that the front and rear sensor intervals are equal to the size of the foot or shoe.
And R ₁ are moved back and forth. Then, the switch (not shown) is turned on, and the weight value “0.
When "0" is displayed, both feet are aligned and placed on the platform 3 such that the center line 12 is sandwiched by both feet and the left and right heels are brought into contact with the backing plate 13.

At this time, the load sensors L ₁ , L ₂ , R ₁ ,
Since the distance before and after R ₂ is equal to the size of the foot or shoe, the weight is always the load sensors L ₁ and R ₁ on the toe side to the load sensors L ₂ and R on the heel side regardless of the size of the foot or shoe. _It acts as a distributed load up to ₂ . Therefore, the load distribution in the y-axis direction is as shown in FIG. 2 (a), and the center of gravity Gy is 100% from the heel to the toe detected by the load sensors L ₁ , L ₂ , R ₁ , and R ₂ . It is directly reflected in the load.

Since both feet are placed with the center line 12 sandwiched therebetween, the weight is always measured by the left and right load sensors L ₁ ,
It acts as a distributed load on the left-right symmetric region with the center line 12 that is the center of L ₂ and R ₁ and R ₂ interposed therebetween. Therefore, the load distribution in the x-axis direction is as shown in FIG. 2B, and the degree of unbalance between the left and right loads is the load sensor L.
It is reflected in the detection load of ₁ , L ₂ , R ₁ , and R ₂ .

Therefore, each load sensor L ₁ , L ₂ , R
₁ , based on the detected load of R ₂ , the weight W in the calculation unit 1B,
The center of gravity positions Gy and Gx are accurately calculated, and the calculation result is displayed on the liquid crystal display 16.

When the inner is adjusted so that the load point (center of gravity point) of the ski boot and its own center of gravity position coincide, the load sensor L ₁ on the toe side is adjusted by the adjusting screw 8 according to the size of the ski boot. And R ₁ are moved back and forth, and the boots are put on the step pedestal 3 to measure the front and rear center of gravity positions. And the load point (center of gravity) of the ski boots is
For example, in the case of being designed at a position of 50% from the heel side, the inner may be adjusted so that the position of the center of gravity measured with the ski boots displayed is 50%.

The step 3 has load sensors L ₁ , L ₂ and R.
₁ and R ₂ will support four points. However, in the case of four-point support, precision is required for surfacing, so as shown in FIG. Alternatively, the left foot placement table 3L and the right foot placement table 3R may be individually formed.

In this case, the left foot placing table 3L and the right foot placing table
3R is front and rear load sensor L₁, L_TwoAnd R₁, R_TwoSupport
Since it is a two-point support that is held, surfacing accuracy is not required.
Yes. In addition, one of the left foot mounting base 3L and the right foot mounting base 3R
Left because the applied load does not affect the other
Front and rear load sensors L on the right and left sides₁, L_TwoAnd R ₁,
R_TwoFor each of the left and right feet based on the output of
The rear center of gravity positions GLy and GRy are individually calculated according to the following equations.
You can GLy = {(m₁) / (M₁+ M_Two)} × 100
[%] GRy = {(n₁) / (N₁+ N_Two)} × 100
[%]

In this way, if the step 3 is separated into the left foot mounting base 3L and the right foot mounting base 3R, the left foot front and rear center of gravity position GLy.
Also, the front and rear center of gravity GRy of the right foot can be calculated individually, and a display field may be separately provided in the liquid crystal display 16 to display the calculation result.

In the above description, the case where only the toe side load sensors L ₁ and R ₁ are positionally adjustable has been described, but the present embodiment is not limited to this, and the heel side load sensors L ₂ and R 1 are not limited to this. _The position of ₂ can be adjusted, or the positions of both can be adjusted. Further, the case where the backing plate 13 is fixedly provided on the heel side has been described, but on the toe side where the position-adjustable load sensors L ₁ and R ₁ are arranged, the load sensors L ₁ and R ₁ are integrally formed. You may provide so that it may move back and forth.

Although the load detector 2 has four load sensors L ₁ , L ₂ , R ₁ and R ₂ as described above, the present invention is not limited to this, and the contact of a foot or shoe is not limited to this. If only the front and rear center of gravity positions on the ground are required,
It suffices if two load sensors are arranged, one on the toe side and one on the heel side.

[0044]

As described above, according to the present invention, at least the load sensor disposed on one of the toe side and the heel side is disposed so that the front and rear position can be adjusted. And the size of shoes, and put both feet on the step with the position of the toes and heel aligned with the position of each load sensor, the front and rear load sensor detection results are 100% from the heel to the toe. The position of the center of gravity is reflected as it is, and it is possible to accurately detect where the position of the center of gravity is on the ground contact surface of the foot or shoe regardless of the standing position and the size of the foot or shoe.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a center of gravity meter according to the present invention.

FIG. 2 is an explanatory diagram showing a load distribution model during measurement.

FIG. 3 is an explanatory diagram showing an example of display contents.

FIG. 4 is a flowchart showing a calculation processing procedure.

FIG. 5 is an explanatory diagram showing another embodiment.

FIG. 6 is an explanatory view showing a conventional device.

FIG. 7 is an explanatory diagram showing a conventional load distribution model.

[Explanation of symbols]

1 --- Center of gravity 1A-Main body of center-of-gravity 1B-Computing unit 2 --- Weight detector 3-Step 4 ...- Base plates L ₁ , L ₂ , R ₁ , R ₂ ... Load sensor 10 … Scale 15 ………… Calculator

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuharu Wada             1-5-30-206 Takaido Nishi, Suginami-ku, Tokyo (72) Inventor Yoichi Ina             87, 1 Horinouchi-cho, Minami-ku, Yokohama-shi, Kanagawa F-term (reference) 2F051 AA18 AA19 BA08                 4C038 VA04 VA11 VB15 VC20

Claims (6)

[Claims] 1. A center of gravity meter for measuring the position of the center of gravity based on the load detected by a load detector (2) arranged between a step (3) on which both feet are placed and a base plate (4), wherein the load detector (2) ) Is composed of two or more load sensors (L ₁ , L ₂ , R ₁ , R ₂ ) arranged on each of the toe side and the heel side, and at least _one of the load sensors (L ₁ , L ₂ , R ₁ , R ₂ ) is attached to the toe side and the heel side. ₁ and R ₁ ) are arranged so that the front and rear positions can be adjusted, and the load detected by the load sensor (L ₁ , R ₁ ) arranged on the toe side and the load sensor (L ₂ , R ₂ ) arranged on the heel side A center of gravity meter, comprising a calculation device (15) for calculating the front and rear center of gravity positions based on the detected load. 2. The center of gravity meter according to claim 1, wherein the step (3) is provided with a scale (10) indicating a distance between the front and rear load sensors on the toe side and the heel side. 3. The load detector (2) comprises a pair of left and right load sensors (L ₁ , L ₁ ) on each of the toe side and the heel side.
₂ , R ₁ , R ₂ ), based on the detection load of the left and right pair of front and rear load sensors (L ₁ , L ₂ ) and the load of the right and front pair of load sensors (R ₁ , R ₂ ). The center of gravity meter according to claim 1 or 2, further comprising an arithmetic unit (15) for calculating the left and right center of gravity positions. 4. The center of gravity according to claim 3, wherein the step (3) is separated into a left foot rest (3L) and a right foot rest (3R). 5. A calculation for individually calculating the front and rear center of gravity positions of each of the left and right feet based on the detected loads of the left and right front and rear load sensors (L ₁ , L ₂ , R ₁ , R ₂ ). Center of gravity according to claim 4, comprising a device (15). 6. The load sensors (L ₁ , L ₂ , R ₁ , R)
₂ ) A calculation device that calculates the weight by the total of the detected loads (1
The gravity center according to any one of claims 1 to 5, further comprising 5).