JP2011160827A - Insole of multi-layer structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem that a conventional insole is configured to have a shape suitable to a particular part of the sole or to have a material specialized for a specific purpose and the conventional insole therefore is not suit each part of the sole having difference in a rugged shape of the sole, intensity of impact from the ground, load distribution by body weight, degree of fatigue, or the like. <P>SOLUTION: The insole is made of: first layers 0101a, 0101b, and 0101c using an elastic material relatively hard compared to upper layers; and second layers 0102a, 0102b, and 0102c using an elastic material relatively soft compared to the first layers 0101a, 0101b, and 0101c which are lower layers. The first layers 0101a, 0101b, and 0101c are structured in such a way that the entire circumference of the outer edge corresponding to the peripheral part of the sole is higher than a sock lining part corresponding to the center of the sole. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an insole for a shoe having a three-dimensional structure in which the thickness of each layer is adjusted according to each part of the corresponding sole, and has an uneven three-dimensional shape.

  Various types of materials, shapes, and three-dimensional structures that have been conventionally used to reduce the burden on the foot during walking, to make it comfortable to wear, to maintain the ideal shape of the foot skeleton, and to prevent lateral movement of the heel Shoe insoles and insoles (hereinafter both referred to as “insoles”) have been proposed.

  For example, there is an insole made of a material such as a sponge having a cushioning property or rubber having elasticity for the purpose of absorbing an impact on the sole. The insole is suitable for a case where the impact is to be reduced in a portion where the impact received from the ground is very large, such as a sole of the sole or a ball portion of the sole. In addition, for the purpose of reducing fatigue, there is an insole having a three-dimensional shape having a convex portion corresponding to the shape of three arches of a sole (so-called lateral arch, inner longitudinal arch, and outer longitudinal arch). The insole is suitable for the purpose of maintaining the shape of the sole arch and distributing the load on the sole over the entire sole to reduce fatigue.

  However, these insoles are effective when used only for a specific purpose in a specific part of the sole, but the material, shape, and three-dimensional structure suitable for each part of the sole are determined. It is not configured to be suitable for the entire back. In other words, when it is configured in a shape suitable for a specific part of the sole, or when it is configured with a material specialized only for a specific purpose, such a configuration may cause inconvenience.

  For example, in the case of an insole made of a material having a soft cushioning property for absorbing the impact, there is a problem that even if the impact is alleviated, the wrinkles are not stable because they are soft, and the wrinkles are likely to sway sideways. FIG. 12 shows a conceptual diagram of the lateral shake of the heel (1201) on the insole (1202) when viewed from the heel side. In such a case, an excessive load is applied to the feet and ankles, and further to the knees and lower back, which may cause colic, Achilles tendonitis, knee pain, and lower back pain. Moreover, since it is a soft material, the wear of the part which is easily subjected to a load due to the body weight is earlier than the other part, and the entire insole is deformed.

  Furthermore, in the case of an insole made of a soft material and having a three-dimensional shape having convex portions corresponding to the sole arch shape, the three-dimensional shape having the convex portions is adversely affected by deformation and wear. An example is shown in FIG. (A) of FIG. 13 shows the figure where the insole which has uneven | corrugated solid shape respond | corresponds to a sole appropriately, (b) shows the figure where the deformed and worn insole respond | corresponds to a sole. In these drawings, the foot is seen from the side, and the insole shows a partial cross section.

  The insole (1301a) shown in FIG. 13 (a) is configured such that a portion (1302a) corresponding to the arch of the sole and a portion (1303a) corresponding to the heel are thicker than the other portions. The part corresponding to the arch is to keep the sole arch shape, the part corresponding to the heel is the part that lands first when walking, and prevents wobble of the heel when landing, and also absorbs shocks . And as shown to Fig.13 (a), when the uneven | corrugated three-dimensional shape of an insole respond | corresponds to each part of a sole appropriately, the effect which an insole has is exhibited to the maximum.

  The insole (1301b) in FIG. 13 (b) is deformed and worn, such that the position of the part (1302b) corresponding to the arch moves with use, and the part (1303b) corresponding to the heel is crushed so that the thickness is almost eliminated. Insole is shown. If the insole thus deformed and worn is continuously used, not only the effect of the insole is not exhibited, but also the foot sole may be adversely affected.

Full-open H07-039507 Full open H06-0777506 Real opening H06-081305

  In recent years, an insole having a multilayer structure having a lower layer made of a relatively hard material and an upper layer made of a relatively soft material has been developed. For example, different materials are laminated and the entire insole has a two-layer structure (Patent Documents 1 and 2), and the lower layer is composed of two different materials on the toe side front part and the heel side rear part of the sole. Is made of a single material and has a two-layer structure (Patent Document 3). These insoles are supposed to prevent deformation and wear of the insole as well as effects such as shock absorption, comfortable wearing, fatigue reduction, and walking stability.

  However, each layer constituting these insoles has a uniform thickness, and the sole has different uneven shapes on the sole, the magnitude of impact received from the ground, the load distribution due to weight, the degree of fatigue, etc. The thickness distribution of each layer was not suitable for each part. Therefore, even if the structure is appropriate for the part with the foot, it is not necessarily the appropriate structure for the other part of the foot, and it may cause instability or fatigue. Existed.

  Therefore, in order to solve the above problems, the present invention has the following structure.

  (1) The present invention includes a first layer that uses an elastic material that is relatively hard compared to the upper layer, a second layer that uses an elastic material that is relatively soft compared to the first layer that is the lower layer, The first layer provides an insole in which the entire circumference of the outer edge corresponding to the periphery of the sole is higher than the foot support corresponding to the center of the sole.

  (2) In the above (1), the combination of the relatively hard material and the relatively soft material is a combination of cork rubber and foamed rubber, or a combination of urethane resin and urethane resin. The described insole is provided.

  (3) The present invention provides the insole according to the above (1) or (2) in which all or a part of the foot receiving portion corresponding to the central portion of the sole of the first layer is an opening.

  (4) In the present invention, the second layer is configured such that the thickness gradually increases so as to reduce the impact on the foot from the outer edge portion to the foot support portion. An insole according to any one of the above is provided.

  (5) In the present invention, the second layer is configured to be relatively thicker than its peripheral portion in order to form an arch convex portion corresponding to the arch of the sole. An insole according to any one of the above is provided.

  (6) The present invention provides the insole according to any one of (1) to (5) above, which has a third layer made of a breathable sponge as an upper layer of the second layer.

  (7) The present invention provides the insole according to any one of (1) to (6), further including an uppermost layer made of a breathable material.

  According to the insole of the present invention, it is possible to prevent lateral movement of the heel and increase walking stability.

Conceptual diagram of Embodiment 1 for right foot Cross-sectional view of embodiment 2 for right foot Cross-sectional view of Embodiment 2 for right foot and left foot Cross-sectional view of embodiment 2 for right foot Conceptual diagram showing the three arches on the right foot sole Right foot skeleton as seen from the sole Conceptual diagram of Embodiment 2 for right foot Conceptual diagram of Embodiment 2 for right foot Conceptual diagram of Embodiment 2 for right foot Cross-sectional view of the insole of Embodiment 2 for the right foot cut at 1 cm intervals Average load distribution of right foot during walking Conceptual diagram showing the side shake of a shark Partial sectional conceptual diagram of an insole according to the prior art

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this invention should not be limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof. The first embodiment will be described mainly with respect to claims 1 and 2. The second embodiment will be described mainly with respect to claims 3 to 5. The third embodiment will be described mainly with respect to claims 6 and 7.
<< Embodiment 1 >>
<Embodiment 1: Overview>

  This embodiment includes a first layer that uses an elastic material that is relatively hard compared to the upper layer, and a second layer that uses an elastic material that is relatively soft compared to the first layer that is the lower layer. In the insole, the first layer is configured such that the entire circumference of the outer edge corresponding to the peripheral edge of the sole is higher than the foot support corresponding to the central part of the sole.

The combination of the relatively hard material and the relatively soft material is either a combination of cork rubber and foamed rubber, or a combination of urethane resin and urethane resin. To do.
<Embodiment 1: Configuration>

  FIG. 1 is a conceptual diagram for the right foot of this embodiment. (A) is a perspective view, (b) is a sectional view (longitudinal sectional view) of a line connecting A and A ′ of (a), and (c) is a sectional view of a line connecting B and B ′ of (a) ( (Cross-sectional view). The same applies to FIGS. 7 to 9 below.

  The insole of this embodiment has a two-layer structure including a first layer (0101a, 0101b, 0101c) constituting the lower layer of FIG. 1 and a second layer (0102a, 0102b, 0102c) constituting the upper layer. In addition, as shown in (a) to (c), in the first layer (0101a, 0101b, 0101c), the entire outer edge part circumference (0103a, 0103b, 0103c) corresponding to the peripheral part of the sole is the central part of the sole It is comprised higher than the foot support part (0104a, 0104b, 0104c) corresponding to.

  The “insole” of the present invention includes both so-called insole and insole. In this specification, “insole” refers to a part of footwear that is a finished product, and is assembled in the footwear manufacturing process and cannot be removed.

    On the other hand, in this specification, “insole” means an item that can be attached as one part of footwear in the production process of footwear, or an item that can be attached and removed later as an additional part to the finished footwear. Say.

    In other words, the “insole” of the present invention may be sold as an “insole” as an integral part of footwear, or as an “insole” attached to the footwear or sold separately from the footwear. There is also.

  The “first layer” (0101a, 0101b, 0101c) refers to a layer using an elastic material that is relatively hard compared to the upper layer. The “second layer” (0102a, 0102b, 0102c) refers to a layer using an elastic material that is relatively soft compared to the first layer, which is a lower layer. That is, the “first layer” is the lower layer, and the “second layer” is the upper layer. Here, the “lower layer” is a layer closer to the ground in use, and the “upper layer” is a layer closer to the sole of the foot.

    Examples of the elastic material that is relatively hard compared to the upper layer used in the first layer include urethane foam, non-foam urethane resin, silicon resin, and styrene resin. It may be gel-like. When using urethane foam or non-foam urethane resin, it is generally lighter compared to using silicone resin, styrene resin, or foamed rubber as described later. Can be made lightweight. The hardness of the first layer is preferably in the range of A19 to 65 / S (a value when measured with a type A durometer in accordance with JISK6253. The same applies when the hardness is shown in the following description). . If it is smaller than this hardness range, it is too soft and lacks walking stability and shape retention. Conversely, if it is larger than this hardness range, it is too hard and lacks cushioning properties.

    Examples of the elastic material that is relatively soft compared to the first layer, which is the lower layer, used for the second layer include urethane foam, non-foam urethane resin, silicone resin, and styrene resin. It may be gel-like. When using urethane foam or non-foam urethane resin, it is generally lighter compared to using silicone resin, styrene resin, or foamed rubber as described later. Can be made lightweight. When the same material as the first layer is used, the first layer and the second layer are likely to adhere to each other in the manufacturing process in which the first layer and the second layer are overlapped and combined. The hardness of the second layer is preferably in the range of A10-40 / S. If it is smaller than this hardness range, walking stability and shape retention are lacking. Conversely, if it is larger than this hardness range, it is too hard and lacks cushioning properties. The average hardness difference between the first layer and the second layer may be about A10-30 / S, preferably about A20 / S. This is a numerical value obtained from a rule of thumb.

  In this way, the first layer is made of a material harder than the second layer, and conversely, the second layer is made of a softer material than the first layer, so that the second layer mainly absorbs the impact on the sole. While the cushioning effect is achieved and the comfortable wearing comfort is realized, the first layer has the effect of preventing the stability of the foot, particularly the lateral movement of the heel and enhancing the shape retention of the entire insole.

  “The first layer is configured such that the entire circumference of the outer edge corresponding to the periphery of the sole is higher than the foot support corresponding to the center of the sole” means that the first layer corresponding to the periphery of the sole It means that it is comprised so that the outer periphery whole periphery of a layer may come to a position higher than the footrest part corresponding to the center part of a sole.

  The meanings of “relatively hard” and “relatively soft” in the above are intended to include the case where the average values of the hardness of each layer are compared. This is because the hardness of each layer is not made uniform, but the hardness may be distributed according to the location. That is, even if the first layer is relatively hard as a whole and the second layer is relatively soft as a whole, the softest part of the first layer is more rigid than the hardness of the hardest part of the second layer. It is because it may not be hard. This can occur when trying to optimize the insole's foot stiffness in parts. Therefore, in such a case, the average value is compared as described above. Even if it compares by an average value, the meaning of this invention is not impaired. For example, the so-called stepping portion may be designed so that the thickness of the entire layer is thin, while the hardness of the second layer is relatively harder than the average hardness of the same layer only in the thinly designed portion. . This part of the second layer may soften the softest part of the first layer, for example the so-called “step part” depending on the design, but the hardness may be relatively harder than the “step part”. is there.

  The “periphery of the sole” refers to the outer periphery of the entire sole from the toes of the foot to the heel and from the little toe of the foot to the thumb. Further, the “corresponding to the peripheral edge” portion refers to this “along the peripheral edge” portion. That is, “the entire outer edge portion corresponding to the peripheral edge portion of the sole” means the entire portion along the outer peripheral edge portion.

  Further, the “center part of the sole” means an inner portion of the “periphery peripheral part”, and particularly the center periphery. In other words, the “foot receiving portion corresponding to the central portion of the sole” refers to a portion of the insole that is inside the periphery of the sole and closer to the center. It can be said that the “foot support portion corresponding to the center of the sole” is an insole region where the sole directly contacts. However, an area corresponding to a soil arch is also included in this footrest.

  For example, in FIG. 1A, the entire circumference (0103a) of the outer edge portion of the first layer (0101a) is positioned higher than the foot support portion (0104a). Similarly, in FIGS. 1B and 1C, the outer peripheries (0103b and 0103c) of the first layer (0101b and 0101c) are positioned higher than the footrests (0104b and 0104c), respectively. It is configured.

  The first layer is configured such that the entire outer edge portion corresponding to the peripheral edge portion of the sole is higher than the foot support portion corresponding to the central portion of the sole. The structure is such that the two layers are wrapped not only from the bottom but also from the entire side surface, preventing lateral movement of the heel and the like, and increasing walking stability.

    The combination of the relatively hard material used for the “first layer” (0101a, 0101b, 0101c) and the relatively soft material used for the “second layer” (0102a, 0102b, 0102c) And a combination of foam rubber and a combination of urethane resin and urethane resin.

  “Cork rubber” refers to a product in which cork particles are dispersed in rubber. For example, foam rubber is suitable. This is because it is light and has an appropriate hardness. Here, the rubber foam is not limited to what is generally referred to as rubber, but includes rubber that is not generally referred to as rubber but acts as a cork binder.

  Cork alone has problems in durability, shape retention, etc. due to its structure, but durability, shape retention, etc. can be improved by using cork rubber. Furthermore, if you use cork rubber, you can make it feel barefoot when you walk.

    Further, by adjusting the compounding ratio of cork, the weight, hardness, durability, shape retention, degree of touch transmission when walking, etc. can be appropriately determined. In the case of using a rubber which is usually said to be a rubber foam, the cork content is preferably about 20% to 40% by weight. If it is smaller than this, the weight of the foamed rubber material is preferential, and if the foamed rubber is a material heavier than cork, it becomes too heavy or too close to the hardness of the rubber. If it is larger than this, the properties of cork will be remarkably manifested, making it brittle as a material, and tending to tear or break. Such cork rubber exhibits a suitable balance of hardness, durability, shape retention, and degree of touch when walking. In other cases, when using the above-mentioned adhesive, the cork blending ratio is about 50% to 90% by weight. If it is smaller than this, the properties of the adhesive will appear remarkably, and it may become too hard. On the other hand, if it is larger than this, the properties of the cork will remarkably appear and become brittle as a material, and it will easily tear or break. Or, the connection between corks becomes weak, and the same result is obtained.

  In addition, at the time of vulcanization molding, a gauze-like cloth or the like (typically cotton gauze) may be laminated and integrated on one side or both sides of the cork rubber, and this may be used as the first layer. For example, the cork rubber and the gauze-like cloth are integrated by, for example, arranging a gauze-like cloth on one or both sides at the time of vulcanization molding of the cork rubber, and heating and compressing this to integrate the cork rubber and the gauze-like cloth. Thus, the cork rubber which integrated the gauze-like cloth is more durable and less likely to break.

The foam rubber used for the second layer will be described. Here, “foam rubber” generally refers to rubber having foamability. The foamed rubber used in the second layer is preferably SBR (styrene butadiene rubber). It is lightweight and has excellent elasticity, and it is comfortable to wear without being deformed even when used for a long time with moderate hardness. In particular, because of its elasticity, it has a function of absorbing impacts from the ground.
<Embodiment 1: Effect>

According to the insole of the present embodiment, it is possible to prevent lateral movement of the heel and increase walking stability.
<< Embodiment 2 >>
<Embodiment 2: Overview>

  In the present embodiment, an insole in which the first layer in the first embodiment has an opening in the whole or a part of the foot receiving portion corresponding to the center of the sole is described.

  In addition, an insole in which the second layer is configured to gradually increase in thickness so as to reduce the impact on the foot from the outer edge portion to the foot receiving portion will be described.

In addition, an insole in which the second layer is configured to be relatively thicker than its peripheral portion in order to form the arch convex portion corresponding to the arch shape of the sole will be described.
<Embodiment 2: Configuration>

  “The entire first foot support portion is open” means that the foot support portion of the insole has no first layer and is composed of only the second layer. In addition, “a part of the foot support part of the first layer is an opening” means that there is no first layer in a part of the foot support part of the insole, and the part is composed only of the second layer. It means being.

  FIG. 2 shows an example of a cross-sectional view of the right foot insole viewed from the heel side. (A) shows the insole in which all the foot support parts (0201a) of the first layer are opened. The outer edge portions (0202a, 0203a) have a layer structure of the first layer and the second layer (a structure that hardly overlaps the upper and lower sides is also referred to as a layer structure), but the entire foot support (0201a) is the first layer. It consists of only two layers. When the first layer is made of cork rubber, which is relatively hard, even if the foot support is composed of only the second layer, which is relatively softer than the first layer, it prevents the lateral movement of the heel and the shape of the insole. Demonstrates holding function. Further, (b) to (d) show insoles in which a part of the foot support portions (0201b, 0201c, 0201d) of the first layer is opened. The outer edge portions (0202b, 0203b, 0202c, 0203c, 0202d, 0203d) and a part of the foot support portion have a layer structure including a first layer and a second layer. When the second layer is made of a relatively soft foamed rubber, the outer edge of the first layer is thickened to prevent lateral wrinkling of the heel and maintain the shape of the insole.

  In addition, as shown in (d), the thickness and cross-sectional shape of the first layer and the second layer may be asymmetrical. In (d), the portion corresponding to the inside of the foot (left side in the figure) is thicker than the portion corresponding to the outside of the foot (right side in the figure).

  In addition, the portion corresponding to the outside of the foot (right side in the figure) is thicker than the second layer, and in the portion corresponding to the inside (left side in the figure), the thickness of the first layer and the second layer is Almost the same or the first layer is thicker. As will be described later, this increases the thickness of the relatively soft second layer compared to the outer second layer in order to maintain the inner vertical arch shape and absorb individual differences in the vertical arch height.

  Further, depending on the part of the foot, the insole may be configured by combining these (a) to (d). Furthermore, the first layer is configured in a ladder shape or a grid pattern between the portion corresponding to the inside of the foot and the portion corresponding to the outside to reduce the weight and prevent the insole from being flattened. Good. In such a case, it is possible to adopt a configuration that is lightweight and appropriately prevents lateral shaking.

  In contrast to FIG. 2D, the portion corresponding to the outside of the foot (0301, 0304) may be configured to be thicker than the portion corresponding to the inside of the foot (0302, 0303) as shown in FIG. In the case of a leg with troubles of O-legs or knee osteoarthritis, an abnormal load is applied to the outside of the knee joint and heel. In such a case, by using an insole as shown in FIG. 3, the knee joint alignment is guided inward to reduce the load on the knee joint. Here, the outer side of the heel has a larger load during walking than the inner side of the heel, so the second layer (0305) having a cushion function is thickened, and further, the knee joint alignment is guided to the inside. The first layer (0306) is also thick. As a result, it is possible to reduce the load on the leg having the trouble of the O leg or the knee osteoarthritis.

  In addition, regarding the presence or absence of the opening of the first layer of these insoles and the degree of opening, the thickness and shape of the first layer and the second layer, each part of one insole, for example, a toe part, an arch part, It is preferable that the heel portions are different from each other. This is because, as described above, the uneven shape of the sole, the magnitude of impact received from the ground, the load distribution due to body weight, the degree of fatigue, and the like are different in each part of the sole. For example, since the heel portion receives a very large impact on the inner side and the outer side without unevenness, it is generally preferable that the central portion of both the first layer and the second layer is made thicker to the same extent. However, specifically, for example, it is conceivable to design in accordance with the expected weight of a person who uses footwear. It is conceivable to increase the ratio of the thickness of the cushion layer (second layer) as the weight increases. It is also possible to design according to the purpose of using footwear. For example, if the footwear is intended for exercise, the impact will increase, so the ratio of the first layer to the second layer should be in the range of 1: 1 to 1: 2. For example, for exercise for which the impact is large, the thickness of the second layer may be adjusted in the above range in accordance with the type of exercise and the magnitude of the impact associated therewith. Further, in the case of a use application that requires a small amount of exercise, the ratio is about 2: 1 to 1: 1, and the user can walk comfortably by adjusting the thickness of the second layer in accordance with the small amount of exercise.

  Yet another design factor is to design these proportions according to the length of time the footwear is worn with the insole, such as whether it is for a long standing job or a slipper that is only used for a short time. it can. For long standing work, the impact of the sole and insole is not expected to be large, so the entire insole surface is relatively thin with a cushioning second layer and the first layer is relatively It is preferable to make it thick. Moreover, it can also design according to the user age of the footwear which wears an insole. For example, it may be determined appropriately according to whether it is for the elderly or for children. Since it may be difficult for the elderly to balance the body, it is conceivable to make the first layer relatively thick and the second layer relatively thin to assist walking as firmly as possible.

  FIG. 4 shows an example of an insole in which the second layer is configured so that the thickness gradually increases so as to reduce the impact on the foot from the outer edge portion to the foot receiving portion. When only the thickness of the second layer is viewed, the thickness increases from the outer edge portion to the foot support portion (from 0401a to 0403a). This is because the foot receiving portion receives a larger impact from the ground than the outer edge portion, and accordingly, the second layer serving as a cushion for reducing the impact is made thicker. Moreover, it is because it is more effective to make the outer edge part of the 1st layer which plays the role which prevents a horizontal shake and hold | maintain a shape thicker than a foot support part. In addition, as shown to (b), the 2nd layer may be comprised from the middle from the outer edge part to the footrest part. Further, (c) shows an example in which a first layer having a hardness sufficient for preventing wrinkles of the heel and for maintaining the shape of the insole is opened. Moreover, as long as it is comprised so that thickness may become thick gradually from an outer edge part to the said foot support part, as shown in FIG.2 (d), left-right asymmetric may be sufficient.

  Further, the arch-corresponding portion of the second layer may be configured to be relatively thicker than its peripheral portion in order to form the arch convex portion corresponding to the arch shape of the sole. Here, the “foot arch” means three arches, a lateral arch, an inner longitudinal arch, and an outer longitudinal arch. FIG. 5 shows a conceptual diagram of the arch of the right foot. (A) is a conceptual diagram seen from the back of the foot, and (b) is a side view seen from the inside of the foot. The “lateral arch” is an arch that connects the first metatarsal head (0501) of the foot bone to the fifth metatarsal head (0502). The transverse arch-corresponding portion of the second layer is provided in a thin bone portion (diaphragm portion) slightly closer to the heel than the transverse arch corresponding to the arch shape. The “inner longitudinal arch” is an arch that connects the first metatarsal head (0501) and the ribs (0503). The inner longitudinal arch corresponding portion of the second layer is provided in a corresponding portion between the heel and the first metatarsal head corresponding to the arch shape. The “lateral longitudinal arch” is an arch that connects the fifth metatarsal head (0502) and the rib (0503). The outer longitudinal arch corresponding part of the second layer is provided in a corresponding part between the heel and the fifth metatarsal base corresponding to the arch shape.

  In other words, “to make the arch convex part corresponding to the arch shape of the sole relatively thicker than its peripheral part” means that the part surrounded by the three arches rises from its periphery. This is to make the second layer thick. More specifically, convex shapes corresponding to the following three arch shapes are connected by smooth curves. FIG. 6 shows a right foot skeleton as seen from the sole.

  The convex shape corresponding to the transverse arch (0601) has a width from the second metatarsal (0605) to the fourth metatarsal (0607), and the length is the second metatarsal (0605) / third metatarsal. A drop-shaped convex shape (0616) connected by a smooth curved surface corresponding to the degree of bone (0606). More specifically, the width is 25 to 45 mm, the length is 45 to 65 mm, and the height is 6 to 14 mm.

  The convex shape corresponding to the medial longitudinal arch (0602) has a width from the inside of the first wedge bone (0609) to the outside of the third wedge bone (0611), and the length from the vicinity of the first metatarsal head (0615). This is a leaf-shaped convex shape (0617) connected by a smooth curved surface corresponding to the vicinity of the radius distance projection (0614) of the radius (0613). More specifically, the width is 10 to 40 mm, the length is 85 to 115 mm, and the height is 10 to 16 mm.

  The convex shape corresponding to the lateral longitudinal arch (0603) has a width from the outside of the fifth metatarsal base (0612) to the inside of the fifth metatarsal base (0612) and has a length of the fifth metatarsal base. This is a leaf-shaped convex shape (0618) connected by a smooth curved surface corresponding to the center of the rib (0613) from (0612). More specifically, the width is 5 to 25 mm, the length is 75 to 95 mm, and the height is 9 to 13 mm.

The second layer has a relatively peripheral portion in order to form an arch convex portion corresponding to any one or two of the three arches (0601, 0602, 0603) of the sole. It may be configured thicker.
<Embodiment 2: Effect>

According to the insole of this embodiment, the impact received from the ground is appropriately adjusted by adjusting the thickness of the first layer and the second layer and the three-dimensional convex shape of the entire insole according to each part of the corresponding sole. It is possible to relax, to prevent lateral shaking, and to maintain the shape of the insole.
<< Embodiment 3 >>
<Embodiment 3: Overview>

In this embodiment, an insole having a third layer made of a breathable sponge as an upper layer of the second layer in the insole of the first or second embodiment will be described.
<Embodiment 3: Configuration>

  FIG. 7 shows a conceptual diagram of this embodiment. A third layer (0703a, 0703b, 0703c) is provided on the upper layer of the second layer (0702a, 0702b, 0702c) which is the upper layer of the first layer (0701a, 0701b, 0701c).

  The “third layer” is composed of a breathable sponge material. Here, the “sponge material” is not particularly limited as long as it is made of sponge or a porous structure and has air permeability. Due to the presence of the air-permeable sponge layer, the insole of the present embodiment improves the ventilation of the contact surface, prevents stuffiness, and realizes comfortable comfort.

  In addition, as shown in FIG. 8, the insole of this embodiment is a further upper layer of the first layer (0801a, 0801b, 0801c), the second layer (0802a, 0802b, 0802c), and the third layer (0803a, 0803b, 0803c). May have an uppermost layer (0804a, 0804b, 0804c) made of a material having air permeability. “Top layer” (0804a, 0804b, 0804c) is a layer located on the uppermost surface when the insole is attached to footwear, and is a layer that is assumed to be in direct or indirect contact with the sole. It is. “Indirect contact” means, for example, when the user is wearing socks or the like, the uppermost layer and the sole contact with each other through the socks. The “uppermost layer” is not particularly limited as long as it is a breathable material. However, a bed cloth having moisture absorption / release properties is more preferable in order to prevent the stuffiness and to realize comfortable comfort.

  As shown in FIG. 9, the uppermost layer (0904a, 0904b, 0904c) is the first layer (0901a (not shown), 0901b, 0901c), the second layer (0902a (not shown), 0902b, 0902c). ), The third layer (0903a (not shown), 0903b, 0903c) may be configured to cover the entire side surface. When the insole is used for footwear having a shape that does not cover the heel portion like sandals and covers only the toes, it is preferable in that the layer structure is not visible and the aesthetic appearance of the footwear is not impaired.

The uppermost layer is bonded to other layers by a method that does not impair the breathability of the insole. For example, a mesh-like adhesive sheet (includes a wide network-like structure, including various types such as those similar to the fiber structure of Japanese paper) and a layer immediately below it. Place between and glue. This realizes comfortable comfort without impairing the air permeability of the uppermost layer of the insole and the air permeability of the third layer (sponge layer), for example. The network-like adhesive sheet may realize an adhesive function by heating, pressurizing, or the like. This mesh-like adhesive sheet may be used to bond other layers. An appropriate adhesive may be selected according to the material of the layer to be bonded and the compatibility of the layer to be bonded.
<Embodiment 3: Effect>

  According to the insole of this embodiment, the ventilation of the foot contact surface is improved, and stuffiness is prevented and comfortable comfort is realized. Also, moisture is likely to evaporate when footwear is not worn. Furthermore, the beauty of footwear is not impaired.

As an example of the present invention, an insole constituted by the following Table 1 is shown.

Moreover, the insole comprised by following Table 2 is shown as an insole which uses a urethane as a component.

  Urethane is a foamed product (urethane foam) in both the first layer and the second layer. Polyether-based semi-rigid urethane is a semi-rigid type and has a relatively low density, and polyether-based highly elastic urethane is a soft type and has a relatively high density.

  Hardness was measured by a method based on JISK6253. When the hardness of the first layer is smaller than the hardness range shown in Tables 1 and 2, it is too soft and lacks walking stability and shape retention. On the contrary, if it is larger than the hardness range of Table 1 and Table 2, it is too hard and lacks cushioning properties. Moreover, when the hardness of the second layer is smaller than the hardness range shown in Tables 1 and 2, walking stability and shape retention are lacking. On the contrary, if it is larger than the hardness range of Table 1 and Table 2, it is too hard and lacks cushioning properties.

  In addition, in the insole comprised by Table 2, the one layer from which hardness differs partially can be comprised by combining several layers which consist of the same or near material at the time of manufacture, and compressing this material.

  Thus, even if a plurality of layers may be combined at the time of manufacturing, if the materials are the same or close, they constitute one layer.

  Next, the first layer and the second layer shown in Table 1 in FIG. 10 are divided into a third layer having a uniform thickness of 1 mm obtained by compressing and densifying urethane foam, and a uniform layer having a uniform thickness. The cross-sectional view seen from the heel side at the time of cut | disconnecting the insole for right feet comprised by the upper layer at about 1 cm space | interval is shown. In the figure, “1” is an end (cross-sectional view) on the toe side, and “24” is an end on the heel side. In addition, “1” in the figure seems to have a thick uppermost layer because the uppermost layer at the back of the cross section is visible, and the thickness of the uppermost layer is the entire insole. It is uniform.

  In FIG. 10, from “9” to “12” in the figure, “10” is the apex, and the central part of the second layer is formed in a convex shape. This is because the arch convex part corresponding to the sole of the sole is configured to be relatively thicker than its peripheral part. Further, the inner side of the second layer is thicker than the outer side of the second layer from “11” to “19” in the figure.

Moreover, the average load distribution of the weight at the time of walking when the footwear on which the insole of FIG. 10 is worn is worn is shown in FIG. 11 (the thing shown in color in FIG. 11 is submitted in the property submission form of the present application: Measurement area in which the foot shape indicated by the bold line in the figure actually placed the foot). FIG. 11 shows the results of measurement using a foot pressure distribution measuring apparatus (F-scan; manufactured by Nitta Corporation). (B) shows the average load distribution when using an insole that forms an arch convex part corresponding to the arch of the sole, and (a) uses a flat insole that does not constitute an arch convex part. The average load distribution is shown. In (b), the load average of the toe part (forefoot part: the area from the toe side to one third of the foot length) is 41% of the body weight, and the arch part (medium foot part: 3 minutes further from the forefoot part to the foot length) The load average of the area up to 1) was 29% of the body weight, and the load average of the heel part (part of the middle leg part and one third of the rest of the leg length) was 30% of the body weight. In (a), the load average of the toe part was 54% of the body weight, the load average of the arch part was 17% of the body weight, and the load average of the heel part was 29% of the body weight. Thereby, (b) is concentrated on the toe portion, whereas (b) is a portion where the weight is averaged during walking is distributed over the entire sole. Therefore, the insole constituting the arch convex part (b) can prevent local load distribution and can further reduce fatigue.

Claims (7)

A first layer using a relatively hard elastic material compared to the upper layer;
A second layer using a relatively soft elastic material compared to the first layer, which is the lower layer,
Consists of
The first layer is an insole in which the entire circumference of the outer edge corresponding to the periphery of the sole is higher than the foot support corresponding to the center of the sole.   The insole according to claim 1, wherein the combination of the relatively hard material and the relatively soft material is a combination of cork rubber and foamed rubber, or a combination of urethane resin and urethane resin.   The insole according to claim 1 or 2, wherein the first layer has an opening in all or part of a foot receiving portion corresponding to a central portion of the sole.   The insole according to any one of claims 1 to 3, wherein the second layer is configured to gradually increase in thickness so as to reduce an impact on the foot from the outer edge portion to the foot support portion.   The insole according to any one of claims 1 to 4, wherein the second layer is configured to be relatively thicker than a peripheral portion thereof so as to form an arch convex portion corresponding to the arch of the sole.   The insole according to any one of claims 1 to 5, further comprising a third layer made of a breathable sponge as an upper layer of the second layer. The insole according to any one of claims 1 to 6, further comprising a top layer made of a breathable material.