JPH0347527Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a shoe insole, and more specifically, the present invention relates to an insole suitable for correcting the arch of the sole of the foot.

(Prior Art) The insole of a shoe is mainly composed of an elastic material such as plastic foam, and is used to reduce shocks and vibrations applied to the foot during walking and walking. The phenomenon conventionally used for insole is the cushioning action of an elastic material, but since it is not sufficient to absorb the shock transmitted from a person's feet to knees, further to the lower back and head, the applicant has developed a material such as elastic polyurethane. A shoe insole in which a viscoelastic material such as viscoelastic polyurethane is integrally chemically bonded to a part of the elastic material has been proposed (Utility Model Publication No. 62-75704).
issue). The areas where this type of viscoelastic material is used are:
These are the midfoot and heel, where shocks are most likely to be applied.

In addition to the midfoot and heel, there is an arch in the sole of the human foot.
There is a vertical arch in the arch of the foot. Recently, as the heels of ordinary shoes have become higher, more and more people are suffering from lowered arches, which causes fatigue and sluggishness in the feet. Although the conventional insoles described above are very suitable for gymnastics and other sports, no consideration has been given to these problems, and in fact, even when using the conventional insoles, this problem does not occur. is not resolved.

(Purpose of the invention) The purpose of the invention is to prevent fatigue and sluggishness caused by the decline of the arch by preventing the decline of the arch, and to correct the same.

(Summary of the invention) The present invention is a shoe consisting of a sheet part made of an elastic material such as elastic polyurethane, and a part made of a viscoelastic material such as viscoelastic polyurethane connected to the lower side or inside of the sheet part. In the insole, a portion of viscoelastic polyurethane is used in a vertical axis arch portion and/or a horizontal axis arch portion, and the elastic polyurethane swells upward in the arch portion due to the presence of the viscoelastic polyurethane. We provide shoe insoles that

According to the insole of the present invention, it is possible to prevent or correct foot fatigue and sluggishness even in shoes whose structure places some stress on the arch.

(Specific Description of the Invention) The present invention will be described in detail below with reference to the drawings, but first the elastic body and viscoelastic body used in these examples will be explained.

The elastic body that can be used in the present invention is preferably polyurethane foam or other elastic foam. Since such an elastic body is well known as a cushion material, it will not be specifically explained. However, a particularly suitable elastic body is an elastic polyurethane, and one that chemically bonds with the viscoelastic body during molding and foaming is particularly preferred.

The viscoelastic body that can be used in the present invention is a conventionally known viscoelastic body such as viscoelastic polyurethane.
No. 194913 and other publications describe viscoelastic polyurethanes that can recover their original shape. Among these, particularly suitable ones are:
Polyoxyalkylene glycol with a molecular weight of about 1500 to 6000, a small amount of polyol with a molecular weight of 500 or less,
It is a polymer with polyisocyanates, which has the remarkable feature of completely recovering its original shape within 1 second after removal of external pressure. A product that meets these conditions is commercially available from Sanshin Kosan Co., Ltd. under the trade name Sorbothane. Other viscoelastic materials include ethylene-propylene-diene copolymers (dienes include ethylidene, norbornene, cyclopentadiene, 1,4-hexadiene, etc.), nitrile rubber,
mixture of halogenated butyl rubber and nitrile rubber,
Butyl rubber, silicone rubber, styrene-butadiene rubber, polyether-based polyurethane, etc. may also be used. When a viscoelastic material, particularly a viscoelastic polyurethane, is selected to have an appropriate hardness, when a force is gently applied to the arch from the sole side due to the weight of the shoe, a large amount of resistance is generated despite the soft contact. Therefore, the necessary supporting force can be applied to the arch portion without the effect of a stiff spring. On the other hand, in the case of a sudden impact, at the beginning when the force starts to be applied, the action of a relatively weak spring causes plastic deformation while creating cushioning properties. Because of this, energy is absorbed by shear friction, and strong repulsive force does not return to the arch, making viscoelastic polyurethane ideal in this respect as well.

A particularly suitable combination of an elastic body and a viscoelastic body is the above-mentioned elastic polyurethane and viscoelastic polyurethane.

The elastic body and the viscoelastic body may be bonded together with an adhesive, but preferably they are strongly bonded chemically. Chemical bonding here means that the active groups of those molecules bond directly to the bond, not by adhesive bonding. As an example of the latter, as described in Japanese Utility Model Application Publication No. 62-75704, one has an excess of isocyanate groups and the other has an excess of active hydrogen groups, and the two are allowed to react with each other during molding. In a preferred example, a viscoelastic polyurethane having an excess of one group is preformed into a predetermined shape, and this is placed in a predetermined position in a mold to form a preform capable of forming an elastic polyurethane foam having an excess of the other group. Manufactured by casting a polymer onto or around it. In a most preferred example, a polyoxyalkylene glycol with a molecular weight of about 1500 to 6000, a small amount of a polyol with a molecular weight of 500 or less, and an aromatic polyisocyanate are used.
The viscoelastic polyurethane molding obtained by reacting with NCO/OH in an amount less than 1 is reacted with an isocyanate-excess foaming polyurethane prepolymer.

EXAMPLE Referring to FIG. In this example, both the horizontal axis arch and the vertical axis arch are simultaneously supported by the viscoelastic body according to the present invention, but only one may be used depending on the wearer or depending on the condition. .

FIG. 1 is a view of the insole 1 seen from the bottom, and FIG. 2 is a sectional view taken along the line C-C' in FIG. The insole 1 includes a foamed elastic body, for example, an elastic polyurethane portion 2, which is formed into the same shape as in a normal state and has a substantially constant thickness;
It consists of a viscoelastic body, for example viscoelastic polyurethane parts 3 and 4, which are integrally bonded to the bottom surface thereof. The viscoelastic body part 3 is arranged in the horizontal arch part, and the viscoelastic body part 4 is arranged in the vertical arch part. It should be noted that these are completely different from the viscoelastic body arrangement proposed in the prior art. That is, conventionally, viscoelastic materials have been placed in the midfoot region 6 and heel region 7, which are subjected to impact when walking, but this method does nothing to prevent arch deterioration or alleviate symptoms caused by a deteriorated arch region. It is not possible to fulfill the role of In contrast, in the present invention, the arch is located at the part that contacts the midfoot and/or at the arch.

3 and 4 show preferred shapes of the viscoelastic body part 3, which is arranged in the transverse arch part, among the viscoelastic body parts.
This part is located at a substantially central position close to the midfoot part 6, and has a substantially omusubi shape. As shown in FIG. 4, the upper surface is formed into a chevron shape, and as shown in FIG. 2, the surface side (the part that contacts the sole of the foot) is covered with polyurethane foam, forming a protrusion 5. . Note that this horizontal arch portion may have another shape, for example, a flat and circular shape.

5 and 6 show a preferred shape of the viscoelastic body portion 4 disposed in the vertical arch portion of the viscoelastic body, which is approximately elliptical. As shown in the figure, the vertical arch portion is a long and narrow portion of the arch portion that is in contact with the inside. This viscoelastic body part 4 also has an upper surface covered with the elastic body 2 to form a protruding part, as in FIG. Note that this vertical arch portion may be flat and elliptical.

FIG. 7 shows a modification of the present invention, in which the bottom surfaces of the viscoelastic bodies 3 and/or 4 are covered with the foamed elastic body 2.

(Operations and Effects) As configured as described above, the shoe insole of the present invention exhibits predetermined operations and effects. A predetermined supporting effect acts on the sole of the wearer's foot at the portion where the viscoelastic body is fixed. Since the viscoelastic body deforms easily in the initial stage, it does not cause discomfort when walking, but unlike the elastic body 2, it generates sufficient load supporting force at a certain pressure or more. Furthermore, even if it is once deformed, it can recover its original shape within a short period of time, so it can work well not only when standing still but also when walking.

According to the insole of the present invention, it is possible to prevent or correct foot fatigue and sluggishness even in shoes whose structure places some stress on the arch.

[Brief explanation of the drawing]

Figure 1 is a bottom view of the insole of the present invention, Figure 2 is a sectional view taken along line C-C', Figure 3 is a plan view of the viscoelastic body for the transverse arch, and Figure 4 is a cross-sectional view of the insole of the present invention. -A' sectional view, Figure 5 is a plan view of the viscoelastic body part for the vertical arch part,
FIG. 6 is a sectional view taken along the line B-B', and FIG. 7 is a sectional view similar to FIG. 2 of another example.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sheet portion made of an elastic material such as elastic polyurethane, and a portion made of a viscoelastic material such as viscoelastic polyurethane bonded to the lower side or inside of the sheet portion. In the shoe insole comprising: a viscoelastic polyurethane portion is used in a longitudinal arch portion and/or a transverse arch portion, and the elastic polyurethane bulges upward in the arch portion due to the presence of the viscoelastic polyurethane. A shoe insole featuring: (2) The elastic body is foamed elastic polyurethane,
The viscoelastic body is a viscoelastic polyurethane obtained by polymerizing a polyoxyalkylene glycol with a molecular weight of about 1500 to 6000, a small amount of a polyol with a molecular weight of 500 or less, and a polyisocyanate, and both polyurethanes are chemically bonded. Shoe insoles as described in section.