JPH11151102A - Layered insole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a layered insole whose fit is improved by improving the structure of the shank part of the insole so that a user hardly gets tired from walking on the shoe. SOLUTION: This layered insole consists of a bottom layer 1, a middle layer 2 which is layered on the bottom layer 1 and an upper layer 3 which is layered on the middle layer 2. The Young's madulus or the hardness of the middle layer 2 is lower than that of the bottom layer 1, and the upper layer 3 is to be in contact with the sole of a foot. The upper surface 10 of the bottom layer 1 and the upper surface 20 of the middle layer 2 are curved to rise upward on the inner shank part 4. The upper surface 10 of the bottom layer 1 is formed to be a curved plane suitable for the shape of the sole of a foot when deformed by load on the inner shank part 4. And the upper surface 20 of the middle layer 2 is formed to be a curved plane suitable for the shape of the sole of a foot before deformed on the inner shank part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe insole, and more particularly to a laminated insole.

[0002]

2. Description of the Related Art Insole functions include contact with the sole inside the shoe, preventing slippage of the foot, preventing loss of power, and finally absorbing the impact on the foot. Shock absorbing function. In order to exhibit these functions and the like, there is known a laminated insole in which a relatively soft middle layer is laminated below an upper layer such as a cotton cloth, and further, a relatively hard lower layer is laminated (for example, Japanese Utility Model Publication No. 59-59). -23528).

[0003]

By the way, in the insole,
In addition to a flat flat insole, there is a molded insole in which the surface of a tread portion of the insole rises along the shape of the sole. Since such a molded insole fits the sole of the foot, the fit is good. However, despite the fact that the shape of the sole changes with a change in load during walking or the like, an insole in which the change in the shape of the sole is sufficiently considered has not been proposed. In particular, despite the fact that the deformation of the arch of the tread portion is closely related to muscle fatigue, there is no insole that fully takes into account the deformation of the arch.

Accordingly, an object of the present invention is to pay attention to the point that the shape of the arch of the sole, particularly the step portion, changes according to the load state, and to devise the structure of the step portion of the insole to improve the fit. An object of the present invention is to provide a laminated insole which can improve the feeling and is hard to be tired.

[0005]

Prior to describing the configuration of the present invention for achieving the above object, the principle of the present invention will be described. The inventor measured the height of the rough surface of the scaphoid bone B in FIG. 3 from the ground in the load standing position and examined how the load deforms the foot. As shown in FIG. In addition, it was confirmed that the arch A in FIG. 3 became flatter as the load increased. During walking, the load state and the no-load state occur alternately and continuously, and with the change in load,
The arch A of the tread portion is repeatedly deformed. Due to the deformation of the arch A, the impact during walking is reduced, and the burden on the body is reduced. When the arch A of the foot is deformed,
The ligaments and sole muscles act as resistance. Here, the muscles of the sole can adjust the tension according to the magnitude of the load (load), but are more likely to be fatigued than the ligaments, and the feeling of fatigue of the lower leg and feet due to walking is excessive in the arch A. It is considered that the muscle of the sole becomes fatigued by the deformation. Therefore, it is presumed that if the shape of the arch is held by the insole so that the arch is not deformed more than necessary, the load on the muscles of the sole is reduced and fatigue becomes less likely.

[0006]

That is, the laminating insole of the present invention comprises a laminating middle layer having a lower Young's modulus or hardness than the lower layer on the lower layer, and further contacting the back of the foot on the middle layer. The upper layer is laminated, and the upper surface of the lower layer and the upper surface of the middle layer are laminated insoles curved so as to rise upward in the inner tread portion, and the upper surface of the lower layer in the inner tread portion has a sole shape deformed by load. The upper surface of the middle layer in the inner tread portion is set to a curved surface along the shape of the sole before deformation.

According to the present invention, when a foot arch is deformed to some extent due to an impact at the time of landing during walking or running, the deformed sole contacts the upper surface of the hard lower layer, thereby supporting the arch. Therefore, the extension of the sole muscle can be prevented from becoming excessive. On the other hand, even in a no-load state where the foot floats in the air during walking, the upper surface of the middle layer follows the shape of the sole before deformation, so the foot is in contact with the surface of the insole, so the fit is also good. good.

In the present invention, the reason why the "Young's modulus or hardness" is specified is that it is sometimes difficult to measure either the Young's modulus or the hardness due to the relationship between the shape and structure of the insole and the measuring instrument. Therefore, if the middle layer is smaller in at least one of Young's modulus and hardness than the lower layer, it is included in the scope of the present invention.

In the present invention, as the "sole shape", a foot which satisfies standard foot conditions among a large number of subjects is selected, and an average sole shape obtained by synthesizing the foot shape is adopted. Can be. Further, “deformed by a load” may mean, for example, a state in which the user is deformed by applying a load of about twice the weight in a standing position.

In the first aspect of the present invention, it is difficult to determine immediately from the structure of the insole whether or not the insole is included in the scope of the present invention. In addition, it must be understood that if the upper surface of the middle layer has larger undulations than the upper surface of the lower layer in the inner tread portion, it is included in the scope of the present invention.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2,
This insole is a so-called cup inner sole type,
As shown in FIGS. 1B to 1G, a lower layer 1, an intermediate layer 2, and an upper layer 3 are laminated.

The lower layer 1 has a large Young's modulus and hardness,
For example, it is formed of a non-foamed resin. As shown in the bottom view of FIG. 1A, the lower layer 1
It has a shank function in addition to the push-up prevention function.

1B to 1G, the middle layer 2
Is made of, for example, EVA foam resin, has a lower Young's modulus and hardness than the lower layer 1, and exhibits a shock absorbing function. The upper layer 3 is formed to have a substantially uniform thickness over the entire surface. For example, a cloth material such as a cotton pile or a cotton coarse weave having excellent hygroscopicity is used.

The upper surfaces 10, 2 of the three layers 1, 2, 3
0 and 30 correspond to FIG. 2 and FIGS.
As shown in FIG. 5, the inner step portion 4 is curved so as to swell upward. The inner tread portion 4 of the middle layer 2 is formed thicker than the portion 4A near the inner tread portion 4 of the middle layer 2,
The upper surface 20 of the middle layer 2 has a larger undulation than the upper surface 10 of the lower layer 1 in the inner tread portion 4. That is, the upper surface 10 of the lower layer 1 in the inner tread portion 4 is set to a curved surface along the average sole shape deformed by the load, while the upper surface 20 of the middle layer 2 in the inner tread portion 4 is set.
Is set to a curved surface along the average sole shape before deformation. The middle layer 2 generally needs to be at least 3.0 mm thick at the thickest portion of the inner tread portion 4 as compared to the portion 4A near the inner tread portion 4.

By the way, in the above embodiment, the laminated insole is formed by three layers 1, 2, and 3. However, in the present invention, four or more layers may be formed. For example, the middle layer 2 may be formed of two layers, or another layer may be interposed between the lower layer 1 and the middle layer 2 or the like. Further, the present invention does not limit the material or material, and the lower layer 1 may be formed of a foamed resin or sponge rubber.

[0016]

As described above, according to the present laminated insole, the upper surface of the lower layer in the inner tread portion is set to a curved surface conforming to the shape of the sole deformed by the load, and the lower layer is formed of the middle layer. Since the Young's modulus or hardness is higher than that of the lower arch, when an impact is applied during walking or running and the arch of the foot is deformed to a certain extent, the arch of the foot is supported by being in contact with the upper surface of the hard lower layer. Therefore, since the extension of the sole muscle can be prevented from becoming excessive, fatigue of the sole muscle can be reduced. on the other hand,
Because the upper surface of the middle layer in the inner tread is set to a curved surface that conforms to the sole shape before deformation, even when there is no load when the foot floats in the air during walking or running, even in the inner tread Since the sole touches the surface of the insole, a sufficient fit can be obtained.

Further, if the hard lower layer is provided only on the tread portion and the rear foot portion as in the invention of claim 4, the forefoot portion of the insole is easily bent when walking or the like. Even if the shank function for suppressing the torsion of the shoe is increased, the above-mentioned flexibility is not reduced. That is, both the flexibility of the insole and the shank function can be improved. Further, the local push-up force from the convex portion of the ground can be dispersed by the hard lower layer, and the impact applied to the heel portion of the foot can be reduced.

[Brief description of the drawings]

FIG. 1 is a bottom view and a cross-sectional view of a laminated insole showing an embodiment of the present invention.

FIG. 2 is a perspective view and a vertical (II-II line) sectional view.

FIG. 3 is a side view showing a foot bone.

FIG. 4 is a graph showing a change in the height of an arch due to a load.

[Explanation of symbols]

 1: Lower layer 10: Upper surface of lower layer 2: Middle layer 20: Upper surface of middle layer 3: Upper layer 4: Inner tread 5: Hind foot

Claims (4)

[Claims] An intermediate layer having a lower Young's modulus or hardness than the lower layer is laminated on the lower layer, and an upper layer in contact with the back surface of the foot is laminated on the intermediate layer, wherein the upper surface of the lower layer and the upper surface of the intermediate layer Is a laminated insole curved so as to bulge upward in the inner tread portion, and the upper surface of the lower layer in the inner tread portion is set to a curved surface along a sole shape deformed by a load; A laminated insole in which the upper surface of the middle layer in the flap is set to a curved surface that follows the shape of the sole before deformation. 2. An intermediate layer having a lower Young's modulus or hardness than the lower layer is laminated on the lower layer, and an upper layer in contact with the back of the foot is laminated on the intermediate layer, wherein the upper surface of the lower layer and the upper surface of the intermediate layer Is a laminated insole that is curved so as to rise upward in the inner tread portion, wherein the upper surface of the middle layer has a larger undulation than the upper surface of the lower layer in the inner tread portion. . 3. The laminated insole according to claim 1, wherein the inner tread portion of the middle layer is formed thicker than a portion near the inner tread portion of the middle layer. 4. The laminated insole according to claim 1, 2 or 3, wherein the lower layer is provided only on the tread portion and the rear foot portion.