JP3010578B2 - Running shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A running shoe according to the present invention has been proposed for the purpose of improving the reuse of kinetic energy at the time of landing during running.

[0002]

2. Description of the Related Art In the field of running shoes, attention has conventionally been given to the impact mitigation and the improvement of rebound resilience at the time of landing during running of running shoes, and mid soles having various shock absorbing structures have been proposed. I have.

[0003] For example, Japanese Patent Publication No. Hei 6-93844 discloses that the stomach portion and the heel portion of the midsole or one of them has a JIS rebound resilience of 70% or more and a JIS A hardness of 20 to 40. A midsole equipped with an elastic unit made of a highly resilient elastomeric alloy having characteristic values is disclosed.

[0004]

However, including the above-mentioned examples, the point of view of the conventional shoes is to reduce the impact at the time of landing during running and to improve the rebound resilience accompanying this. It is aimed at selecting such a material, and lacks a positive idea of using the energy possessed by the body wearing the shoe when the shoe lands for the next step.

When analyzing the movement of the feet during running,
For example, the right foot lands on the ground, lowers the hips, raises the left foot at the same time, quickly kicks the right foot diagonally backward to lift the body and move forward.

[0006] Since the gravity of the earth is constantly acting on the body, at the next moment, the body is dropped in a parabolic manner .

Next, the left foot catches the falling body with the ground, and at the same time, lowers the hips by bending the knees for the next step, and simultaneously raises the right foot and quickly kicks the left foot diagonally backward to lift the body. Advance at the same time.

Thereafter, the running is continued by repeating the movement of the left foot and the right foot.

Considering the energy involved in the above-mentioned running motion, the energy stored in the muscles is converted into kinetic energy by bending the knee of the right foot and then immediately extending the kinetic energy. Becomes potential energy, and when landing, becomes kinetic energy again and is applied to the left foot.

The left foot bends the knee to brake the left foot muscle and protect the body so that the applied kinetic energy does not apply a large impact to the body, and to obtain the energy of the next step.

[0011] That is, the running action is performed by the interaction between the generation of energy by the stepping foot muscle and the braking of the landing foot muscle.

However, if the kinetic energy for landing can be stored in the structure of the shoe, it can be reused for the next step, without straining the leg muscles and reducing fatigue. You can run easily.

It is taught in physics that energy is the amount of work, the product of the force on a mass and the distance of the mass moving in the direction of the force.

Therefore, when using the midsole of a shoe as an energy storage mechanism, it is necessary to set both the elasticity and the displacement of the midsole to values suitable for running. In the present invention, this is proposed for this purpose. It is a thing.

[0015]

In order to achieve the above object, a running shoe according to the present invention is provided in order from a toe.
In addition, the main section, the step section, and the heel section
The dosole touches the upper sole under the upper and the ground
It has a shoe sole sandwiched between the lower sole and the main part of the tread, which temporarily stores kinetic energy when it lands.
Since then reused in the next step, in the 20mm to 40mm thickness of the right and left sides of its recess is formed as the junction surface of the Rowasoru becomes deeper from the left and right sides toward the center, Elasticity is 25g per 1mm thickness displacement
from f (g) / cm ² to the polymeric material of 100 gf / cm ^2, wherein the formed Turkey.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a side view of a running shoe 10 according to the present invention.
It comprises a midsole 13 and a lower sole 14.

The upper 11 covers the upper of the shoe wearer's foot, fixes the shoe to the foot, and protects the foot from the external environment.

The upper sole 12 has a role of contacting the sole of the foot and transmitting a static load due to the weight of the wearer and a dynamic load due to the movement of the wearer to the midsole 13.

The midsole 13 transmits the static load transmitted from the upper sole to the lower sole, converts the energy due to the dynamic load transmitted from the upper sole into elastic strain, and temporarily stores it as elastic strain energy. Later, it has a function to utilize this energy for the next step.

The lower sole 14 is attached to the lower side of the mid sole with a substantially uniform thickness, transmits a static load transmitted from the mid sole to the ground, and widely disperses uneven ground pressure due to unevenness of the ground. It also serves to prevent wear of the back of the shoe due to contact with the ground and to prevent the shoe from slipping on the ground.

The midsole 13 has a thickness of 20 mm to 40 m at the right and left sides of the center line 20 at a position behind the toe portion 13 a of the main portion 21 of the shoe.
m thick portion 13b and a thickness of approximately 0 m along the center line 20
and a thin portion 13c having a thickness of 10 to 10 mm.
/ Cm ² to 100 gf / cm ² of foamed synthetic resin, sponge, rubber, polyurethane and other elastic polymeric materials.

The thick portion 13b has a width of 10 mm to 20 mm inward from the left edge 13d and the right edge 13e of the shoe.
mm, the plane is substantially flat, and the thin section 13c following this plane is continuously connected by an inclined surface 13f.

In short, the tread main portion 21 of the midsole 13 is provided with a concave portion whose bottom surface becomes deeper from the left and right sides toward the center, that is, a concave concave portion below.

The heel portion 23 of the midsole has a substantially uniform thickness of about 5 mm to 10 mm in order to provide stability to the foot of the shoe wearer when landing, and is made of JIS. The hardness is about A80.

The tread portion 22 may be any structure that smoothly connects the tread main portion 21 and the heel portion 23. The material is the same as the tread main portion, and the thick portion 13b of the tread main portion is used.
Is thinner than

When the shoe constructed as described above stands upright in a state of rest with two feet, as shown in FIG. 4, the midsole 13 and the tread main portion 21 are compressed in the thickness direction, and are substantially It has the same thickness as the heel 23.

When standing upright with two feet, it is known that approximately one half of the weight of the shoe wearer rests on the tread main part and the other half rests on the heel part. .

Therefore, when a load equal to one half of the body weight is applied to the tread main part 21, the distortion in the thickness direction becomes a difference between the thickness of the tread main part and the thickness of the heel part. By setting the elasticity of the material, the state shown in FIG. 4 can be obtained.

When the shoe wearer stands upright in the state shown in FIG. 4, the upright stability of the wearer is mainly determined by the heel portion 23.
Is obtained by the reaction force received from the ground.

That is, the heel has a lower elasticity and a higher hardness than the main part of the heel. Therefore, the instability with respect to the upright caused by the elasticity of the stepping main portion is compensated by the stability of the heel portion, and the wearer can stably stand upright.

Next, the operation of the shoe when the wearer of the shoe runs will be described.

In running, the wearer of the shoe jumps upward from the ground and once leaves the ground,
As shown in FIG. 6, the main part of the foot is trampled and lands first.

In other words, the wearer once obtains the energy of the position and then lands in place of the kinetic energy.

This kinetic energy compresses the tread main portion 21 of the midsole and is temporarily stored as elastic strain energy, and the main tread acts to release the elastic strain energy upon completion of landing.

The main portion of the midsole tread according to the present invention has a thickness much larger than that of the conventional running shoes, and the thick portion 13b has a thickness of 20 mm to 40 mm.

When kinetic energy is stored as elastic energy, considering the midsole as one spring,
According to the physics, the energy storage amount is a product (multiplied value) of a spring constant (a force required for distorting a unit length) and a distortion amount.

[0038] and has a main portion 21 the value of the displacement 1mm per 25 gf / cm ² to 100 gf / cm ² in the thickness direction treading of the midsole of the present invention.

When the contact area of the tread main portion 21 of the midsole is 60 cm ² and the displacement is 20 mm,
The stored energy is 300 kgf-mm to 1200 kg as shown by E ₁ and E ₂ in Equations 1 and 2, respectively.
−mm.

[0040]

(Equation 1)

[0041]

(Equation 2)

This value is the potential energy when a human having a weight of 60 kgf jumps upward by 5 mm to 20 mm.
It is equivalent to having the ability as a spring to absorb the energy of the position when jumped up.

Therefore, according to the shoe of the present invention, when jumping, most of the energy given to the body by the step-side foot muscles is temporarily applied to the midsole portion of the shoe worn on the landing-side foot. Since the energy is released after being stored as strain energy, the burden on the leg muscles required for the next step is reduced.

Next, the stability of the shoe of the present invention will be described.

As described above, the shoes of the present invention are:
It has a much thicker midsole tread main part than conventional shoes, and has great elasticity.

Therefore, there is an element that makes the body unstable at the time of landing when running.

For example, as shown in FIG. 7, there is a possibility that the foot jumps upward and then lands on the left while tilting to the left.

As a countermeasure in this case, the shoe of the present invention has a thin portion 1 at the center of the tread main portion of the midsole.
3c is formed so that the left and right thick portions 13b always contact the ground before the center thin portion 13c at the time of landing.

FIG. 7 is a cross-sectional view showing a case where the landing is performed by inclining leftward. The left thick portion 13b first comes into contact with the ground and receives a reaction force F from the ground.

This reaction force F acts greatly in the direction in which the shoe is corrected in the vertical direction. The same effect is applied to the case where the shoe is sloping to the right and corrects the shoe vertically.

This correction torque is applied to the thick portion 13b and the center line 2
It is equal to the product of the distance 1 to 0 multiplied by the reaction force F, and is similar to the operation of correcting the inclination of a ship by using buoyancy when the ship is just tilted on the water.

If the thin portion 13c is not formed at the center, if the ground is uneven and the center of the shoe just hits the convex portion of the ground when the shoe lands, FIG. As shown, a reaction force is received from the ground near the center of the shoe, and the shoe is tilted to the right or left, and the foot of the shoe wearer becomes unstable.

However, in the shoe of the present invention, since the thin portion 13c is formed at the center of the main portion of the midsole stepping portion, as shown in FIG. , And receives a reaction force from the left and right ends of the ground, so that the landing can be performed stably.

Next, a comparison test between the shoe according to the present invention and a commercially available shoe conventionally used will be described with reference to Table 1.

The data relating to the shoes of the present invention used in the test are as follows. Kind of elastic polymer material: Foamed polyurethane Thickness of left and right sides of main part of tread: 30 mm Maximum depth of recess: 20 mm Elasticity of midsole: 50 g per 1 mm of displacement in thickness direction
f / cm ²

As a conventional commercially available shoe, the thickness of the main part of the midsole to be treaded is 6 mm and the J
Those having an IS.A hardness of 80 were used for the test.

[0057]

[Table 1]

In the test (1), on a flat ground,
With the body bent and standing still, mark the back end of the heel of the shoe on the ground, then jump as far as possible and mark the back end of the heel after landing on the ground. The jump distance is determined by adjusting the difference between the positions of the marks before and after the jump.

The test (1) was performed four times, and the average value is shown in Table 1.

In a test using commercially available shoes, 1
A jump distance of 600 mm was obtained, and a test using a shoe of the invention resulted in a jump distance of 1750 mm.

The difference between the two is 150 mm, which indicates that the use of the shoe of the present invention has increased the jump distance by about 9%.

In the test (2), the right hand was extended upright on a flat ground, and the position of the fingertip of the right hand was marked on the side of the upright pillar. Thereafter, the user jumps as high as possible, marks the fingertip of the right hand on the pillar at the highest position, and measures the height difference between the marks before and after the jump to determine the jump distance.

The test (2) was performed four times, and the approximate values of the average values are shown in the table.

In a test using commercially available shoes, 2
A jump distance of 25 mm was obtained and a jump distance of 260 mm was obtained in tests using the shoes of the invention.

The difference between the two is 35 mm, and it can be seen that according to the present invention, the jump distance was increased by about 18%.

In the test (3), the number of steps and the time required for running on a horizontal ground at a distance of about 25 m by a so-called jogging running method were obtained.

The test (3) was performed four times, and the average value is shown in Table 1.

In the test using commercially available shoes, 3
In contrast to the test using the shoes of the present invention, which took 15 seconds in 5 steps, it took 14 seconds in 32 steps. In the case of using the shoes of the present invention, the number of steps was reduced by 3 steps and the time was 1 hour. It turns out that it takes less seconds. These values correspond to an approximately 9% reduction in steps and an approximately 7% reduction in time.

This test result shows that while running the same distance,
Wearing the shoes of the present invention reduces the number of steps,
Therefore, it means that the vehicle can travel comfortably with little fatigue on the body.

[0070]

By wearing the running shoes of the present invention described above, most of the potential energy possessed by the body when jumping during running can be converted into kinetic energy upon landing and reused. This has the effect that the vehicle can run more easily than when wearing conventional shoes.

[Brief description of the drawings]

FIG. 1 is a side view of a shoe according to the present invention.

FIG. 2 is a bottom view of the midsole taken out of the shoe of the present invention.

FIG. 3 is a transverse sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a side view when the shoe of the present invention is worn and upright.

FIG. 5 is a transverse sectional view taken along line VV of FIG. 4;

FIG. 6 is a diagram showing a state in which the player jumps and lands while wearing the shoes of the present invention.

FIG. 7 is a cross-sectional view of a main portion of a stomping part when the user jumps while wearing the shoes of the present invention and lands on the left side.

FIG. 8 is a cross-sectional view of a main portion of a tread when the user jumps while wearing shoes in which a thin portion is not formed and lands on an uneven ground.

FIG. 9 is a cross-sectional view of a main portion of a stepping when the user jumps while wearing the shoes of the present invention and lands on an uneven ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shoes 11 Upper cloth 12 Upper sole 13 Midsole 13b Thick part 13c Thin part 14 Lower sole 21 Depressed main part 22 Stepping part 23 Heel part

Claims (1)

(57) [Claims] 1. A stepping main part and a stepping step in order from a toe.
A midsole with a continuous section and a heel section
Sandwiched between the upper sole and the lower sole in contact with the ground
It has soles and the main part of the stomping is
Temporarily store dynamic energy and reuse it for the next step
To therefore, is 20mm to 40mm thickness of the right and left side portions
In, a concave portion is formed as the junction surface of the Rowasoru becomes deeper from the left and right sides toward the center, the elastic thickness direction of displacement 1mm per 25 gf (gram) / cm ² to the 100 gf / cm ² higher Running shoes that from molecular material characterized and formed Turkey.