JP2022007872A - Sandal and aid - Google Patents

Abstract

To provide a footwear capable of achieving the improvement of toe gripping force in a daily life.SOLUTION: A sandal comprises a sole 2 and a belt fixing the foot. A sole surface coming in contact with the sole is disposed with a toe root contact part 23 protruding from the other parts. In the toe root contact part 23, a three-toe root contact region with which the roots of three toes of a second toe, a third toe and a fourth toe contact is higher than a big toe root contact region, and a tiptoe side of the toe root contact part 23 is retreated to a heel side from a sole tip so that the toes are bent and pushed into a heel direction.SELECTED DRAWING: Figure 4

Description

Patent Law Article 30, Paragraph 2 Application Applicable Reiwa September 24, 2 Announced through the website https: // www. chounai-kankyo. com / 2020/09/24 /% e8% b6% b3% e6% 8c% 87% e6% 8f% a1% e5% 8a% 9b% e3% 82% b5% e3% 3% 9d% e3% 83% bc % E3% 83% 88% e3% 82% b5% e3% 83% b3% e3% 83% 80% e3% 83% ab% e3% 80% 8c% e9% b7% b2ega-toes% e3% 80% 8d -% E4% bb% a4% e5% 92% 8c% ef% bc% 92% e5% b9% b4% ef% bc% 91% ef% bc% 90 / https: // www. youtube. com / watch? v = ACDokgMJO1I

The present invention relates to sandals and assistive devices thereof that can improve the gripping force of the toes.

The toe gripping function that bends the toes to the heel side has the effect of increasing the friction between the sole and the ground and improving the support of the body, so it plays an important role in the equilibrium function and prevents the elderly from falling. Is also said to have an effect. Therefore, in order to realize a healthy and high-quality life and acquire higher athletic ability, it is important to carry out daily training to improve the gripping force of the toes.

As a training method for improving the gripping force of the toes, a method of gripping or pulling a towel or the like with the toes has been conventionally known. In addition, as a device for improving the toe gripping force, a toe exercise training device (see Patent Document 1) that rotates a roller using the toes and a toe having a toe grip portion on a base. A gripping muscle strength training machine (see Patent Document 2) is also known.

Japanese Unexamined Patent Publication No. 2000-210393 Japanese Unexamined Patent Publication No. 2008-68052

However, these training instruments are only for the purpose of improving the gripping force of the toes, and it is necessary to set a special time for training and to concentrate on training for a certain period of time. Must be. Therefore, there is a problem that the conventional training equipment for improving the toe gripping force is not easy and it is difficult to perform training on a daily basis.

Therefore, in order to solve the problems of the prior art, the present inventors have made diligent studies for the purpose of developing footwear that can improve the toe gripping force in daily life.

As a result of diligent studies to solve the above problems, the present inventors provided a raised portion having a specific shape on the sole surface of the sandal, and brought the base of the toe into contact with the raised portion. It was found that the gripping force of the toes can be easily improved in daily life by bending and stretching the toes. The present invention has been proposed based on these findings, and specifically has the following configuration.

[1] Sandals with a sole and a belt to fix the foot.
On the surface of the sole where the sole of the foot comes into contact, a toe base contact portion that is raised more than other parts is provided.
In the toe base contact portion, the three-finger base contact region where the bases of the index finger, the middle finger, and the ring finger abut is higher than the thumb base contact region.
The toe side of the toe base contact part is a sandal characterized in that the toe is retracted to the heel side from the tip of the sole so that the toe can be bent and pushed in the heel direction.
[2] The region where the toe base contact portion and the region where the toe abuts when the toe is bent and pushed in the heel direction are made of a material softer than the other regions of the sole. [1] Sandals listed in.
[3] On the toe side of the toe base contact portion, the notch for accommodating the bent thumb is cut out to the heel side more than the notch for accommodating the other bent finger. The sandals according to [1] or [2].
[4] The toe base contact portion has a structure in which a contact second layer smaller than the contact first layer is laminated on the contact first layer, and the contact first layer. The sandal according to any one of [1] to [3], wherein the base of the thumb abuts on the exposed surface of the sandal, and the base of the three fingers abuts on the surface of the contact second layer.
[5] The ground side of the sole is composed of a base layer, a heel side covering layer is formed on the heel side, a toe side covering layer is formed on the toe side, and the toe side covering layer is further formed on the base layer. The sandal according to any one of [1] to [4], wherein the toe root contact portion is formed on the toe side region of the side covering layer and the heel side covering layer.
[6] The sandal according to [5], wherein the surface of the base layer is exposed on the toe side of the toe base contact portion.
[7] The sandal according to [5] or [6], wherein the heel-side covering layer has a two-layer laminated structure.
[8] The base layer and the heel side covering layer are formed of a hard material, and the toe base contact portion and the toe side covering layer are formed of a material softer than the hard material. [5] ] To the sandal according to any one of [7].
[9] The sandal according to any one of [1] to [8], wherein the front belt for positioning the instep of the base of the toe and the posterior belt for positioning the ankle are fixed to the sole.
[10] The sandal according to [9], wherein both ends of the rear belt are fixed to the left and right side surfaces of the sole, and the rising angle of the belt with respect to the bottom surface of the sole is within the range of 40 to 60 °.
[11] An auxiliary tool consisting of a bottom portion, an inner side wall portion, and an outer side wall portion, wherein the thickness of the bottom portion at the boundary with the outer side wall portion is larger than the thickness of the bottom portion at the boundary with the inner side wall portion. The item according to any one of [1] to [10], wherein the ground contact surface of the sole is fitted so as to be in contact with the upper surface of the bottom of the auxiliary tool on the toe side from the midpoint between the toe and the heel of the sandal. Sandals.
[12] For footwear, which is composed of a bottom portion, an inner side wall portion, and an outer side wall portion, and the thickness of the bottom portion at the boundary with the outer side wall portion is larger than the thickness of the bottom portion at the boundary with the inner side wall portion. Auxiliary tool for fitting.

According to the sandals of the present invention, it is possible to effectively improve the toe gripping force in daily life.

It is a top view which shows the 1st Embodiment of the sandal of this invention. It is a perspective view seen from the left side surface of the sandal shown in FIG. It is a top view which shows the sole of the sandal for the left foot among the sandals shown in FIG. It is a perspective view from the left side which shows the sole of the sandal for a left foot among the sandals shown in FIG. 1. It is a schematic diagram for demonstrating each part of the sole. It is a figure which shows the state which the toe was bent by wearing the sandal shown in FIG. It is a perspective view seen from the front. It is a figure which shows the state which extended the toe while wearing the sandal shown in FIG. 1, (a) is the perspective view seen from the left side surface, (b) is the perspective view seen from the front. It is a top view which shows one Embodiment of the auxiliary tool of this invention. It is the figure which fitted the auxiliary tool to the sandal. (A) is a perspective view seen from the front, and (b) is a perspective view seen from the left side surface. It is a perspective view which shows the toe grip strength measurement board which came into contact with a grip strength meter.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments and specific examples, but the present invention is not limited to such embodiments. In addition, the numerical range represented by using "-" in this specification means the range including the numerical values before and after "-" as the lower limit value and the upper limit value.

The sandal of the present invention is a sandal having a sole and a belt for fixing the foot, and the surface of the sole to which the sole of the foot abuts is provided with a toe base contact portion that is raised more than other parts. In the toe base contact area, the three-finger base contact area where the bases of the three fingers, the index finger, the middle finger, and the medicinal finger abut, is higher than the thumb base contact area. The toe side of the foot is characterized in that it is retracted from the tip of the sole so that the toes can be bent and pushed in the direction of the heel.
Since the sandal of the present invention is provided with the toe base contact portion as described above on the sole surface, when the sandal is worn, the toe base abuts on the toe base contact portion, and the foot is in this state. By bending the finger and pushing it toward the heel, the toe naturally grips the contact portion at the base of the toe. By repeatedly performing such a toe bending motion and training to extend the toes, it is possible to effectively improve the toe gripping force. Further, since the sandals of the present invention are footwear, they can walk while wearing them, and can also perform other work. Furthermore, it is possible to perform toe bending motion and toe extension training in parallel while walking or other work, and even if the training is interrupted while walking or other work. , Training can be resumed immediately without any special preparation. Therefore, according to the present invention, it is possible to easily improve the toe gripping force in daily life.
Hereinafter, specific embodiments of the sandals of the present invention will be described.

<First Embodiment>
The first embodiment of the sandals of the present invention will be described with reference to FIGS. 1 to 5. 1 is a plan view showing the sandals of the first embodiment, FIG. 2 is a perspective view seen from the left side of the sandals shown in FIG. 1, FIG. 3 is a plan view showing the sole of the sandals for the left foot, and FIG. 4 is the sandals for the left foot. A perspective view showing the sole from the left side, and FIG. 5 is a schematic view for explaining each part of the sole.
As shown in FIG. 5, the sole of a human foot is divided into toes, the base of the toes, the midfoot and the heel. In the following description, each area of the sole corresponding to each of these parts while wearing sandals is referred to as a "toe area", a "toe base area", a "midfoot area", and a "heel area", respectively. , The area that combines the midfoot area and the heel area is called the "midfoot heel area". In addition, the side of the sandal that contacts the ground (ground side) is the "lower side", the opposite side is the "upper side", the toe side is the "front side" or "front side", and the "heel side" is the "rear side". The side surface will be described as the “back surface”, and the upper surface will be described as the “front surface”.

As shown in FIG. 1, the sandal 1 of the first embodiment is composed of symmetrical left foot sandals 1L and right foot sandals 1R, and each sandal 1L and 1R has a sole 2 and a belt 3, respectively. ing. In the following description, only the sandals 1L for the left foot may be illustrated and described, but the sandals 1R for the right foot are the same members as the sandals 1L for the left foot except that the left and right sides of the plane shape are reversed. It shall be composed of.

As shown in FIG. 4, the sole 2 has a base layer 21, a covering layer 22, and a toe root contact portion 23 in this order from the ground contact side, and the interfaces of the respective portions are joined and integrated. .. The method of joining the interfaces is not particularly limited, but for example, bonding with an adhesive can be used. The adhesive may be any of a solvent-based adhesive, a hot-melt type adhesive, a chemical reaction type adhesive, an electron beam curable type adhesive and the like.

The base layer 21 constitutes the sole of the shoe, and is formed in the shape of a plate having a substantially foot shape in a plan view as shown in FIG. As the planar shape of the base layer 21, the shape normally used as the sole of sandals can be adopted, and the surface on the ground side thereof may be provided with grooves or irregularities for preventing slipping.
The base layer 21 is preferably made of a hard material from the viewpoint of preventing wear due to friction with the ground. As used herein, the term "hard material" means a material that is harder than the material that constitutes the toe root contact portion. Specific examples of the hard material include resins such as EVA resin (ethylene-vinyl acetate copolymer). These hard materials may be used alone or in combination of two or more.
The thickness of the base layer 21 can be selected from, for example, a range of 5 to 30 mm, preferably from a range of 6 to 20 mm, and more preferably from a range of 7 to 15 mm. If the base layer is too thin, the strength will be insufficient, and if it is too thick, it will be difficult to walk, and depending on the conditions of use, it may cause a fall.
The vertical and horizontal lengths of the base layer 21 can be appropriately selected according to the dimensions of the user's feet, and are preferably one size larger than the dimensions of the user's feet. Specifically, it is preferably about 1 to 5 cm longer in the vertical direction and about 1 to 3 cm longer in the horizontal direction than the size of the sole of the user. For example, the vertical length of the base layer 21 may be selected from the range of 20 to 35 cm, and the horizontal length of the base layer 21 may be selected from the range of 7 to 15 cm. Here, the vertical lengths of the sole, the sole 2, and the parts 21, 22, and 23 constituting the sole 2 are the maximum lengths of the base layer 21 in the long axis direction (X direction in FIG. 4). The length or width in the lateral direction means the maximum length in the direction orthogonal to the long axis direction of the base layer 21.

The covering layer 22 is configured by joining and integrating the toe-side covering layer 22a arranged on the toe side and the heel-side covering layer 22b arranged on the heel side, and is joined to the surface of the base layer 21. The covering layer 22 is formed to have substantially the same planar shape and width as the base layer 21 as a whole, except that the tip surface of the toe-side covering layer 22a recedes toward the heel side from the tip surface of the base layer 21. There is. In other words, the surface of the base layer 21 is an exposed surface in which the region near the tip is exposed from the covering layer 22, and the rear side thereof is completely covered with the covering layer 22. A base surface layer 21a for preventing slipping may be formed on at least the exposed surface of the base layer 21. The base surface layer 21a is preferably formed of a soft material that is softer than the hard material used for the base layer 21. For a description of the soft material that can be used for the base surface layer 21a, a preferable range, and a specific example, the description of the soft material that can be used for the toe base contact portion 23, which will be described later, can be referred to. The thickness of the base surface layer 21a can be selected from the range of, for example, 1 to 4 mm.

The toe-side covering layer 22a has a shorter length in the vertical direction (X direction in FIG. 4) than the contact first layer 23a of the toe root contact portion 23 described later in a plan view, and the contact first. It is formed in a plate shape having substantially the same tip surface shape and width as the first layer 23a, and the tip surface is substantially flush with the tip surface of the contact first layer 23a, and the left and right end faces thereof are the contact first layer. It is arranged between the base layer 21 and the toe base contact portion 23 so as to be substantially flush with the left and right end faces of the 23a and the left and right end faces of the base layer 21.
The toe-side covering layer 22a serves as a base for gaining the height of the toe base contact portion 23. The toe-side covering layer 22a is preferably made of a soft material that is softer than the hard material used for the base layer 21. As a result, the force applied downward from the base of the toe is dispersed along with the rotational movement of the toe (the bending and stretching motion of the toe), and the toe can be smoothly rotated. It also makes it possible to walk smoothly while wearing sandals. For the description of the soft material that can be used for the toe-side covering layer 22a, the preferable range, and specific examples, the description of the soft material that can be used for the toe base contact portion 23 can be referred to.
The thickness of the toe-side covering layer 22a can be selected from, for example, a range of 10 to 40 mm, preferably from a range of 12 to 35 mm, and more preferably from a range of 15 to 30 mm.

The heel-side covering layer 22b is formed in a plate shape having substantially the same planar shape and size as the midfoot heel region of the base layer 21 in a plan view, and its left and right end faces and rear end faces are left and right of the base layer 21. It is laminated on the base layer 21 so as to be substantially flush with the end face and the rear end face of the above. The heel-side covering layer 22b is a midfoot heel contact surface in which the midfoot and the heel of the sole of the foot are in contact with the surface of the sandal while the user is wearing the sandals. Further, in the sandals of the first embodiment, the heel side covering layer 22b has two layers (heel side first layer 22c, heel side second layer 22d) having substantially the same planar shape and size in a plan view. The back surface of the heel-side first layer 22c is joined to the surface of the base layer 21, and the surface of the heel-side second layer 22d is the midfoot heel contact surface. Since the heel-side covering layer 22b has a two-layer structure, the height of the heel contact surface of the midfoot is higher than that of the single-layer structure, and as a result, the contact second layer surface (three-finger root contact area) described later is used. ) And the height difference between the surface of the base layer can be earned. As a result, even when the size of the foot is large, the toes can be smoothly rotated without the toes hitting the base layer 21.
The heel-side covering layer 22b (heel-side first layer 22c and heel-side second layer 22d) is preferably made of a hard material. As a result, when the toes are bent toward the heel to grip the toe base contact portion 23, the relative position of the heel with respect to the toe base contact portion 23 is suppressed from shifting, and the toe base contact portion 23 is moved. Can be gripped strongly. For the description of the hard material that can be used for the heel side covering layer 22b, the preferable range, and specific examples, the description of the hard material that can be used for the base layer 21 can be referred to. The heel-side first layer 22c and the heel-side second layer 22d may be made of the same material or may be made of different materials. Further, the heel-side second layer 22d may have a covering surface layer 22e on its surface to prevent slipping. That is, the heel-side second layer 22d may be composed of a hard layer made of a hard material and a coating surface layer 22e provided on the hard layer. The coating surface layer 22e is preferably formed of a soft soft material. For a description of the soft material that can be used for the coating surface layer, a preferable range, and a specific example, the description of the soft material that can be used for the toe base contact portion 23, which will be described later, can be referred to.

The thickness of the heel-side first layer 22c and the heel-side second layer 22d can be selected from the range of, for example, 5 to 30 mm. The thicknesses of the heel-side first layer 22c and the heel-side second layer 22d may be the same or different from each other, but the thickness of the heel-side first layer 22c is the heel-side second layer 22d. It is preferably thicker than the thickness. Specifically, the thickness of the heel-side first layer 22c may be selected from the range of 5 to 30 mm, preferably from the range of 7 to 25 mm, and preferably from the range of 10 to 20 mm. More preferred. Further, the thickness of the heel-side second layer 22d may be selected from the range of 5 to 24 mm, preferably from the range of 5 to 20 mm, and more preferably from the range of 5 to 15 mm. When the heel-side second layer 22d has a surface layer, the thickness of the surface layer can be selected from the range of, for example, 1 to 4 mm. The total thickness of the heel-side first layer 22c and the heel-side second layer 22d may be 10 to 40 mm, preferably 12 to 35 mm, and more preferably 15 to 30 mm.
The thickness of the toe-side covering layer 22a and the thickness of the heel-side covering layer 22b (total thickness of the heel-side first layer 22c and the heel-side second layer 22d) may be the same or different from each other. , It is preferable that they are substantially the same because a coating layer surface without steps can be obtained.

In the toe root contact portion 23, the contact first layer 23a laminated directly above the toe side of the covering layer 22 and the contact second layer 23b laminated on the contact first layer 23a are joined and integrated. As a whole, it has a shape that is raised from the surface of the covering layer 22. As described above, since the sandal of the present invention has a raised shape on the toe side, it can easily take a shape gripped by the toes regardless of the shape of the arch of the foot (vertical arch).

The contact first layer 23a is specifically joined to a portion extending over the surface of the toe-side covering layer 22a and the surface of the heel-side second layer 22d on the toe-side portion. As shown in FIG. 3, the contact first layer 23a recedes toward the heel side from the left and right side surfaces of the base layer 21 and the toe side covering layer 22a and the left and right side surfaces flush with each other, and the tip surface 21f of the base layer 21. It is formed in a plate shape having a front end surface 23f and a rear end surface 23e along the boundary line between the toe root region and the midfoot region. The tip surface 23f of the first contact layer 23a is composed of a substantially arcuate curved surface protruding toward the tip side and a notched surface 23d formed by cutting out a portion corresponding to the tip of the thumb from the curved surface. The notched surface 23d has a shape that is largely cut toward the heel side of the curved surface having a substantially arc shape.
The thickness of the contact first layer 23a can be selected from, for example, a range of 5 to 20 mm, preferably from a range of 6 to 18 mm, and more preferably from a range of 7 to 15 mm.

The contact second layer 23b is joined to the surface of the contact first layer 23a. The contact second layer 23b has a left side surface retracted to the right side of the left side surface of the contact first layer 23a, a right side surface retracted to the left side of the right side surface of the contact first layer 23a, and a contact first. It has a front end surface that is flush with the front end surface 23f of the layer 23a, and a rear end surface that recedes toward the toe side from the rear end surface 23e of the contact first layer 23a. It is formed in the shape of a plate with a small length.
The thickness of the contact second layer 23b can be selected from, for example, a range of 5 to 20 mm, preferably from a range of 6 to 18 mm, and more preferably from a range of 7 to 15 mm.

The total thickness of the contact first layer 23a and the contact second layer 23b may be 10 to 40 mm, preferably 12 to 35 mm, more preferably 15 to 30 mm, and 15 to 25 mm. It is more preferable to have. The ratio of the thickness of the contact second layer 23b to the total thickness of the contact first layer 23a and the contact second layer 23b [(thickness of the contact second layer / total thickness) × 100 (%)] is It may be 20 to 80%, preferably 30 to 70%, and more preferably 40 to 60%.
The height difference between the surface of the base layer and the surface of the contact second layer (total thickness of the toe-side covering layer 22a, the contact first layer 23a, and the contact second layer 23b) may be 20 to 70 mm. It is preferably 30 to 60 mm, more preferably 35 to 55 mm.

In the toe root contact portion 23 composed of the contact first layer 23a and the contact second layer 23b, the left side surface of the contact second layer 23b recedes to the right side of the left side surface of the contact first layer 23a. Since the right side surface of the contact second layer 23b is retracted to the left side of the right side surface of the contact first layer 23a, spaces are formed on the left and right sides of the contact second layer 23b. Therefore, when the base of the toe is brought into contact with the toe base contact portion 23, in the left foot sandal 1L, the bases of the index finger, the middle finger, and the ring finger come into contact with the surface of the contact second layer 23b. The base of the little finger is accommodated in the space on the left side of the contact second layer 23b and is located lower than the base of the three fingers. Further, the base of the thumb is accommodated in the space on the right side of the contact second layer 23b and abuts on the surface of the contact first layer 23a exposed from the contact second layer 23b. On the other hand, in the sandals 1R for the right foot, the roots of the index finger, the middle finger and the ring finger are in contact with the surface of the contact second layer 23b, and the base of the little finger is housed in the space on the right side of the contact second layer 23b. It will be lower than the base of the finger. Further, the base of the thumb is accommodated in the space on the left side of the contact second layer 23b and abuts on the surface of the contact first layer 23a exposed from the contact second layer 23b.
As described above, in the sandal of the present embodiment, the contact second layer 23b is formed in the shape and size as described above, so that the surface of the contact second layer 23b is the index finger, the middle finger and the ring finger. It functions as a three-finger root contact area where the three-finger base abuts. Further, in the sandals 1L for the left foot, the surface of the first layer 23a exposed on the right side of the second layer 23b of contact functions as a thumb-based contact area, and in the sandals 1R for the right foot, the surface of the second layer 23b of contact functions. The surface of the contact first layer 23a exposed on the left side functions as the thumb root contact area. As a result, when the base of the toe is brought into contact with the toe base contact portion 23, the shape can be matched with the lateral arch of the sole of the foot, and the toe base contact portion 23 is firmly gripped by the toes. can do.
Further, since the tip surfaces of the contact first layer 23a and the contact second layer 23b are recessed from the tip surface 21f of the base layer 21, the contact front of the contact first layer 23a and the contact second layer 23b. Space is formed in. Therefore, when the base of the toe is brought into contact with the base of the toe contact portion 23 and the toe is rotated (bent and stretched), the tip of the toe is somewhere other than the base of the toe contact portion 23. The toes can be rotated smoothly without hitting. In particular, since the notched surface 23d is formed, the thumb is exactly accommodated in the space formed by the notched surface 23d, and the thumb can be smoothly rotated together with the three fingers. As a result, the toe gripping function can be efficiently trained.
Further, since the rear end surface of the contact second layer 23b is retracted toward the toe side from the rear end surface 23e of the contact first layer 23a, the surface of the rear portion of the contact first layer 23a is further reduced. It is exposed to form a stepped surface that is lower in height than the surface of the contact second layer 23b. As a result, when the base of the toe is brought into contact with the toe base contact portion 23, the inclination of the base of the toe becomes gentle, and the burden on the base of the toe can be reduced.

As for the preferable range of the lateral length (width) of the contact first layer 23a, the preferable range of the lateral length of the base layer 21 can be referred to. 3 Width of finger root contact area (surface of contact second layer 23b) W1 and width of thumb contact area (exposed surface of contact first layer 23a exposed on the right or left side of contact second layer 23b) The ratio of W2 (W1: W2) may be 1.2: 1 to 2.5: 1, preferably 1.4: 1 to 2: 1. The ratio (W1: W3) of the width W1 of the three-finger root contact region (the surface of the contact second layer 23b) and the width W3 of the exposed surface opposite to the thumb contact region of the contact first layer 23a is. It may be 3: 1 to 6: 1, preferably 3.5: 1 to 5: 1.
The maximum distance d between the tip surface of the base layer 21 and the tip surface of the contact first layer 23a can be selected from, for example, a range of 15 to 40 mm, and is preferably selected from a range of 20 to 35 mm.
Further, the angle θ1 formed by the tip surface 23f of the toe base contact portion 23 and the surface of the contact second layer 23b is shown to be about 90 ° in FIG. 4, but may be 45 to 120 °. , 60 to 110 °, more preferably 75 to 100 °. That is, the tip surface 23f of the toe base contact portion 23 may be orthogonal to the surface of the contact second layer 23b, or may be inclined at an obtuse or acute angle with respect to this surface.

As the material of the toe base contact portion 23 (contact first layer 23a and contact second layer 23b), it is preferable to use a soft material softer than the hard material used for the base layer 21, and it is used for the base layer 21. It is more preferable to use a soft material that is softer than a hard material and has elasticity. By forming the contact first layer 23a, the contact second layer 23b, and the toe side covering layer 22a with a soft material, the base of the toe is brought into contact with the toe base contact portion 23 to bring the toe into contact. When bent to the heel side, the toe side covering layer 22a, the contact first layer 23a and the contact second layer 23b follow the shape of the toe and the base of the toe to some extent, and the toe touches the base of the toe. The shape of gripping the portion can be easily taken. Further, by forming the toe side covering layer 22a, the contact first layer 23a and the contact second layer 23b with a soft material having elasticity, the base of the toe is brought into contact with the toe base contact portion 23. When the toe is bent toward the foot, these layers follow the shape of the toe and the base of the toe to some extent, and the toe can easily hold the contact portion of the base of the toe. At the same time, an appropriate repulsive force is applied to the toes, and the toe gripping force can be effectively improved.
Further, for the toe base contact portion 23, it is preferable to use a material having a displacement of 3 to 6 cm during 40% compression, and it is also possible to use a material having a displacement of 3.5 to 5.5 cm during 40% compression. More preferred. Here, "40% compression displacement" means a 40% compression displacement measured according to the provisions of JIS K 6400-2 (2012).
Further, the slope of the relationship diagram (load / displacement diagram) showing the load (M) on the horizontal axis and the elongation (mm) on the vertical axis of the toe base contact portion 23 is 0.75 ± 20%. It is also preferable to use a material, it is more preferable to use a material having an inclination of 0.75 ± 10%, and it is preferable to use a material having an inclination in a preferable range and a compression displacement of 40% in the above-mentioned preferable range. More preferred.
Specific examples of the material that can be used for the toe base contact portion 23 include a foam (EP sponge) that is a mixture of EVA resin and propylene rubber.
The present invention also includes a base layer 21 and a heel-side first layer 22c in the first embodiment integrally formed as a continuous member without an interface, and the contact first layer 23a and the contact second layer are included. Some include 23b integrally formed as a continuous member without an interface, and some include a toe-side covering layer 22a and a contact first layer 23a integrally formed as a continuous member without an interface. The side covering layer 22a, the contact first layer 23a, and the contact second layer 23b are integrally formed as a continuous member without an interface.

The belt 3 is composed of a front belt 31 and a rear belt 32, and is attached to the side surface (sole side surface) of the sole 2, respectively. The front belt 31 has a role of positioning the instep of the base of the toes, and the rear belt 32 has a role of positioning the ankle.
Specifically, the left end of the front belt 31 is attached to a portion of the side surface of the sole located on the left side of the toe base contact portion 23, and the right end of the front belt 31 is of the side surface of the sole. , It is attached to a portion located on the right side of the toe base contact portion 23, and is configured to cover the instep of the toe base with the belt 31 tightened. Further, in the present embodiment, each end of the front belt 31 is attached to the side surface of the sole by being inserted between the heel side first layer 22c and the heel side second layer 22d and adhered to each interface. However, the mounting method of each end is not limited to this.
On the other hand, the rear belt 32 has a belt fixing portion 32a attached to the side surface of the sole and a belt portion 32b continuous with the belt fixing portion 32a. The belt fixing portion 32a is attached to a portion of the side surface of the sole that is around the heel region. In the present embodiment, the belt fixing portion 32a is attached to the side surface of the sole by inserting the lower end portion between the heel side first layer 22c and the heel side second layer 22d and adhering to each interface. The method of attaching the belt fixing portion 32a is not limited to this. The height position of the upper end edge of the belt fixing portion 32a may be lower or higher than the surface of the heel side covering layer 22b, but if it is high, the upper end edge has a rounded shape and the upper end thereof. The height difference between the edge and the surface of the heel-side covering layer is preferably 2 cm or less, and more preferably 1.5 cm or less. This makes it easy to put on and take off the sandals. Further, it is preferable that the belt portion 32b is provided diagonally so that the rising angle θ2 with respect to the bottom surface (ground plane) of the sole 2 is within the range of 40 to 60 °. As a result, the ankle to which the rear belt 32 is attached is prevented from being displaced back and forth and up and down in the belt, and the shape in which the toe base contact portion 23 is gripped by the toes can be stably maintained.
The materials of the front belt 31 and the rear belt 32 are not particularly limited, and can be appropriately selected from natural leather and synthetic leather that are usually used as materials for sandals and shoes, and elastic materials such as rubber can be used. May be good.
Further, in the present embodiment, the fastener 33 is attached in the middle of the front belt 31 and the belt portion 32b, and the belts 31 and 32b can be freely removed and the belts 31 and 32b can be tightened by operating the fastener 33. You can do it. As the fastener, a fastener usually used for sandals, sneakers and the like can be appropriately selected and adopted, and a fastener having a length adjusting function is preferable. Examples of the fastener having a length adjusting function include a buckle shown in FIGS. 1 and 2 and a hook-and-loop fastener. Further, the belt may be an adjust type belt using an elastic material such as rubber or tightening with a string. In the case of an adjust type belt, the entire instep may be tightened, but it is preferable that the toe side is open so that the toes can be freely bent and stretched.
In such sandals having a front belt 31 and a rear belt 32, by wearing the sandals and tightening each belt, the front belt 31 covers the instep and the rear belt 32 is attached around the ankle to cover the heel side. The surface of the layer 22b and the surface of the toe base contact portion 23 are held in a state of being in contact with a predetermined position on the sole of the foot. That is, it is held so that the foot does not come off the sandal. Further, from this state, when the toe is bent toward the heel and the toe base contact portion 23 is gripped by the toe, the front belt 31 acts to suppress the swelling of the instep. , The base of the toe is prevented from floating from the toe base contact portion 23. As a result, the toe base contact portion 23 can be firmly gripped with the toes. However, it is preferable that the attachment position and dimensions of the front belt are designed so that the belt 31 covers the posterior side of the metatarsophalangeal joint (base of the thumb) of the thumb with the belt tightened. In other words, it is preferable that the anterior belt 31 is designed so that the metatarsophalangeal joint (the base of the thumb) of the thumb comes out in front of the anterior belt 31. Since the base of the thumb rises greatly when the toe base contact portion 23 is gripped with the toes, the toe base contact portion 23 can be firmly gripped by not pressing it with the belt.
Further, the sandals of the present embodiment have two belts, a front belt 31 and a rear belt 32, but the number of belts is not limited to two and may be three or more.

Next, a training method for improving the toe gripping force using the sandals of the first embodiment will be described with reference to FIGS. 6 and 7.
The user who performs the training first puts the base of the toe on the toe base contact portion 23, puts the midfoot part of the sole and the heel on the heel side covering layer 22b, and puts the front side belt 31 and the rear side belt 32. Tighten. As a result, the sandals are attached to the foot, and the base of the toe comes into contact with the toe base contact portion 23. Specifically, the base of the index finger, the middle finger and the ring finger abuts on the surface of the contact second layer 23b, and the base of the thumb hits the surface of the first layer 23a exposed on the side of the contact second layer 23b. Contact. Next, as shown in FIGS. 6A and 6B, the toes are bent toward the heel. As a result, the three fingers of the index finger, middle finger and ring finger abut on the arcuate tip surface 23f of the toe base contact portion 23, the thumb abuts on the notch surface 23d, and the toe base contact portion with the toes. It becomes a shape that grips. Subsequently, as shown in FIGS. 7A and 7B, the toes are fully extended to widen the distance between the toes. By repeatedly performing such training to bend and stretch the toes, it is possible to effectively improve the toe gripping force. At this time, the user may interrupt the training and walk while wearing the sandals, or may perform other work. Training may also be resumed after walking or working. As described above, the training using the sandals of the present invention can be easily performed in daily life because the movements and work other than the training can be performed while wearing the sandals, and the training is continuously performed. It has the advantage of being easy.

In order to evaluate the effect of the sandals of the first embodiment as described above, a test was conducted in which a 54-year-old healthy man wore sandals and performed a toe gripping motion 200 times / day for 20 consecutive days. rice field. The dimensions of each part of the sandals used in the test are as follows.
Base layer 21: EVA resin (thickness 10 mm, length 26 cm in the vertical direction)
Base surface layer 21a: EP sponge (thickness 2 mm)
Toe side coating layer 22a: EP sponge (thickness 28 mm)
Heel side first layer 22c: EVA resin (thickness 18 mm, length 19 cm in the vertical direction)
Heel side second layer 22d: EVA resin (thickness 8 mm, length 19 cm in the vertical direction)
Coating surface layer 22e: EP sponge (thickness 2 mm, length 19 cm in the vertical direction)
Contact first layer 23a: EP sponge (thickness 10 mm)
Contact second layer 23b: EP sponge (thickness 10 mm)
Front belt 31: Synthetic leather (thickness 2 mm)
Rear belt 32: Synthetic leather (thickness 2 mm)
The difference in height between the ground surface and the surface of the coated surface layer is 3.8 cm, the difference in height between the surface of the coated surface layer and the surface of the contact second layer is 2 cm, and the height of the surface of the base surface layer and the surface of the contact second layer. The difference is 4.8 cm.
As a result of the test, the toe gripping force improved from 17.5 kg to 19.5 kg for the right foot and from 22.0 kg to 24.0 kg for the left foot. From this, it was confirmed that the toe gripping force was effectively improved by bending and stretching the toes by wearing the sandals of the present invention.

<Second Embodiment>
The sandals of the second embodiment are configured in the same manner as the first embodiment except that the heel side covering layer is composed of one layer. For the material of the heel-side coating layer and the configuration of each part other than the heel-side coating layer, the corresponding description of the first embodiment can be referred to.
Regarding the preferable range of the thickness of the heel-side coating layer and the toe-side coating layer used in the present embodiment, the preferred range of the thickness of the heel-side second layer 22d used in the first embodiment, or the heel-side first layer 22c. And the preferred range of the total thickness of the heel side second layer 22d can be referred to.
The second embodiment can also obtain the same effects as those of the first embodiment. Further, in the sandals of the second embodiment, in particular, since the heel-side covering layer has a single-layer structure, an effect that the manufacturing process of the sandals can be simplified can be obtained.

<Third Embodiment>
The sandals of the third embodiment have a single-layer sole layer formed as an integral body in place of the base layer 21, the heel-side first layer 22c and the heel-side second layer 22d, and the toe-side covering layer 22a, It is configured in the same manner as in the first embodiment except that it has a single-layer type toe base contact portion formed as an integral body instead of the contact first layer 23a and the contact second layer 23b.
The single-layer sole layer has a shape and thickness in which the base layer 21, the heel-side first layer 22c, and the heel-side second layer 22d of the first embodiment are combined. For the description of the material that can be used for the single-layer sole layer, the preferable range, and specific examples, the description of the hard material that can be used for the base layer 21 of the first embodiment can be referred to.
The thickness of the single-layer sole layer may be selected from the range of 10 to 60 mm, preferably from the range of 15 to 50 mm, and more preferably from the range of 20 to 45 mm.
The single-layer toe base contact portion has the shape and thickness of the toe-side covering layer 22a, the contact first layer 23a, and the contact second layer 23b of the first embodiment. For the description of the material that can be used for the single-layer toe base contact portion, the preferable range, and specific examples, the description of the soft material that can be used for the toe base contact portion 23 of the first embodiment can be referred to. .. For the preferred range of the thickness of the single-layer toe base contact portion, refer to the preferred range of the total thickness of the toe-side covering layer 22a, the contact first layer 23a, and the contact second layer 23b of the first embodiment. can do.
The same effect as that of the first embodiment can be obtained by the third embodiment as well. Further, in the sandal of the third embodiment, in particular, the sole is formed by the single-layer type sole layer formed as an integral body and the single-layer type toe base contact portion formed as an integral body, so that the sandal has a sole. The effect that the manufacturing process can be further simplified can be obtained.

<Auxiliary tool>
The present invention also provides an auxiliary tool for fitting to footwear, which comprises a bottom, an inner side wall portion and an outer side wall portion. This auxiliary tool is characterized in that the thickness of the bottom at the boundary with the outer side wall is larger than the thickness of the bottom at the boundary with the inner side wall. This auxiliary tool is fitted so that the ground contact surface of the sole of the footwear is in contact with the upper surface of the bottom of the auxiliary tool. By fitting, the footwear is fitted between the inner side wall portion and the outer side wall portion of the auxiliary tool, and the footwear and the auxiliary tool are integrated.

FIG. 8 is a side view of a preferred embodiment of the auxiliary tool of the present invention. The inner side wall portion 42 is continuously formed on the inside of the bottom portion 41, and the outer side wall portion 43 is continuously formed on the outside of the bottom portion 41. The bottom portion 41, the inner side wall portion 42, and the outer side wall portion 43 are preferably integrally molded of the same material.
As shown in FIG. 8, the thickness d5 of the bottom at the boundary between the bottom 41 and the outer side wall 43 is larger than the thickness d4 of the bottom at the boundary between the bottom 41 and the inner side wall 42. As a result, when the auxiliary tool is fitted to the footwear, it is possible to make an inclination that raises the outside of the footwear and lowers the inside of the footwear. The magnitude relationship between the thickness of the bottom portion is the thickness of the bottom region up to 2 cm inward from the boundary with the outer side wall portion 43 and the thickness of the bottom region up to 2 cm outward from the boundary with the inner side wall portion 42. It is preferable that it is also established in the meantime. Further, the thickness of the bottom portion 41 preferably decreases from the boundary of the outer side wall portion 43 toward the boundary of the inner side wall portion 42, and more preferably the inclination thereof is constant. As a result, when the auxiliary tool is fitted to the footwear, the inclination of raising the outside and lowering the inside of the footwear can be stably maintained even during walking. The angle of inclination from the outside to the inside of the bottom surface 41 of the auxiliary tool (the angle formed by the bottom surface of the bottom surface and the ground when the top surface of the bottom surface is installed parallel to the ground) θ3 is preferably 3 ° or more, and 15 ° or less. Is preferable. In the case of an auxiliary tool for fitting to the sandals of the present invention, θ3 is more preferably 4 ° or more, further preferably 5 ° or more, further preferably 10 ° or less, still more preferably 7 ° or less. By adjusting the angle to a preferable range, the toes can be gripped without impairing the stability of walking.

The thickness d5 of the bottom portion at the boundary between the bottom portion 41 and the outer side wall portion 43 is preferably 2 cm or more, and more preferably 3 cm or more. Further, it is preferably 10 cm or less, more preferably 7 cm or less, and further preferably 4 cm or less. The thickness d4 of the bottom portion at the boundary between the bottom portion 41 and the inner side wall portion 42 is preferably 1 cm or more, and more preferably 2 cm or more. Further, it is preferably 9 cm or less, more preferably 6 cm or less, and further preferably 3 cm or less. By properly determining the thickness of the bottom, the toes can be reasonably higher than the heel when the footwear is fitted with assistive devices.

The thickness of the inner side wall portion 42 in the direction from the inside to the outside and the thickness of the outer side wall portion 43 in the direction from the inside to the outside are preferably 1 cm or more at the tip portion, and more preferably 2 cm or more. preferable. Further, it is preferably 5 cm or less, and more preferably 3 cm or less. By appropriately determining the thickness, the footwear can be firmly fixed to the auxiliary tool and can be easily attached and detached. The auxiliary tool of the present invention may be adhered and fixed to the footwear with an adhesive or the like. Further, a belt connecting the inner side wall portion 42 and the outer side wall portion 43 may be provided, or the footwear may be more firmly fixed with a string.

As shown in FIG. 8, it is preferable that the tip of the inner side wall portion 42 extends outward rather than rising, and the tip thereof is formed so as to enter the spatial region on the bottom portion, and the outer side wall portion is also formed. It is preferable that the tip of the portion 43 extends inward rather than rising, and the tip is formed so as to enter the space region on the bottom. By adopting such an aspect, the footwear and the auxiliary tool can be firmly fixed when the footwear is fitted, and the auxiliary tool can be made difficult to come off from the footwear when walking. The angle θ4 formed by the upper surface of the bottom and the outer side surface of the inner side wall portion and the angle θ5 formed by the upper surface of the bottom portion and the inner side surface of the outer side wall portion are preferably 85 ° or less, and preferably 80 ° or less. Is more preferable, and it is further preferable that the temperature is 75 ° or less. Further, θ4 and θ5 are preferably 55 ° or more, more preferably 60 ° or more, and further preferably 65 ° or more, respectively.

The horizontal length of the auxiliary tool (depth in FIG. 8, length in the direction from the heel direction to the toe direction) is preferably 3 cm or more, and more preferably 4 cm or more. Further, it is preferably 10 cm or less, and more preferably 7 cm or less. By making it an appropriate length, it is possible to make it easier to walk when walking and to prevent the auxiliary tool from coming off the footwear.

The material of the auxiliary tool is not particularly limited as long as it can be fitted into the footwear and can be maintained so that the auxiliary tool does not come off from the footwear after the fitting. In a preferred embodiment, a material having a hardness of 15 or more and 25 or less can be used. As a result, it is easy to attach / detach to / from footwear, and it is possible to prevent it from coming off during use. Examples of such materials include rubber and foam rubber. As the foam rubber, for example, ethylene propylene foam rubber can be preferably used.

The auxiliary tool of the present invention can be applied to footwear other than the sandals of the present invention, and can be applied to, for example, slippers and shoes.
When fitting the auxiliary tool to the footwear, as shown in FIG. 9, the auxiliary tool is fitted to the toe side from the midpoint between the toe and the heel of the footwear (sandals). This makes it easier for the body weight to be applied to the inside rather than the outside when the body weight is attached to the foot and walks, and the weight is likely to be applied to the heel side. As a result, it is possible to walk safely in the correct posture while keeping the pelvis in a desired state.

<Measurement of toe grip strength>
The grip strength of the toes can be measured using a commonly used grip strength meter. The grip strength of the toes can be easily measured by setting the grip strength meter 6 as shown in the figure using the toe grip strength measuring board 5 shown in FIG. The toe grip strength measuring board 5 is a dogleg-shaped board, and the end portion of the grip strength meter 6 is brought into contact with the inside thereof as shown in the figure (in the figure, it is brought into contact with the inner side surface on the right side). Then, the grip strength of the toes can be measured by placing both feet on the toe grip strength measuring board 5 and firmly gripping the toes on the grip portion of the grip strength meter 6 toward the toe grip strength measuring board 5. In FIG. 10, the grip strength meter 6 is installed at a position where the grip strength of the toes of the right foot can be measured. However, when the measurement of the right foot is completed, the grip strength meter 6 is moved to the inner side surface on the left side of the toe grip strength measurement board 5. And measure the grip strength of the toes of the left foot. The measurement order of the right foot and the left foot may be reversed. At the time of measurement, the toe grip strength measuring board 5 is held so as not to move by putting the weight on the foot of the person not being measured and putting the weight on the heel of the foot of the person to be measured. Therefore, the width of the toe grip strength measuring board 5 is preferably 8 cm or more, and preferably 20 cm or less. It is preferable that the length of the toe grip strength measuring board 5 is within the range of 30 to 45 cm in order to improve the ease of measurement and the convenience of storage. The thickness of the toe grip strength measuring board 5 is preferably set to ± 0.5 cm in thickness of the grip strength meter 6 in order to make it easier for the toes to grip the grip strength meter 6 at the time of measurement. Usually, it is desirable to make the thickness within the range of 2.5 to 3.5 cm. The material of the toe grip strength measuring board 5 is not particularly limited, but it is preferably made of resin, and for example, ethylene vinyl acetate resin (EVA resin) is preferably used.

Although the sandals of the present invention have a simple structure, they can easily improve the toe gripping force in daily life, and can be used in various facilities such as nursing care facilities and sports gyms as well as in the home. can do. Therefore, the present invention has high industrial applicability.

1 Sandals 1L Sandals for left foot 1R Sandals for right foot 2 Sole 21 Base layer 21a Base surface layer 21f Tip surface 22 Coating layer 22a Toe side coating layer 22b Heel side coating layer 22c Heel side 1st layer 22d Heel side 2nd layer 22e Cover surface Layer 23 Toe root contact part 23a Contact first layer 23b Contact second layer 23e Rear end surface 23f Tip surface 3 Belt 31 Front side belt 32 Rear side belt 32a Belt fixing part 32b Belt part 33 Fastener 4 Auxiliary tool 41 Bottom 42 Inner side wall 43 Outer side wall 5 Toe grip force measurement board 6 Grip force meter

Claims (12)

Sandals with a sole and a belt to secure the foot,
On the surface of the sole where the sole of the foot comes into contact, a toe base contact portion that is raised more than other parts is provided.
In the toe base contact portion, the three-finger base contact region where the bases of the index finger, the middle finger, and the ring finger abut is higher than the thumb base contact region.
The toe side of the toe base contact part is a sandal characterized in that the toe is retracted to the heel side from the tip of the sole so that the toe can be bent and pushed in the heel direction. 1. Sandals. The toe side of the toe base contact portion has a notch for accommodating the bent thumb larger than the notch for accommodating the other bent finger toward the heel side, claim 1. Or the sandals described in 2. The toe root contact portion has a structure in which a contact second layer smaller than the contact first layer is laminated on the contact first layer, and the exposed surface of the contact first layer. The sandal according to any one of claims 1 to 3, wherein the base of the thumb is in contact with the sandal, and the base of the three fingers is in contact with the surface of the second contact layer. The ground side of the sole is composed of a base layer, a heel side covering layer is formed on the heel side, a toe side covering layer is formed on the toe side, and the toe side covering layer is further formed on the base layer. The sandal according to any one of claims 1 to 4, wherein the toe base contact portion is formed on the toe side region of the heel side covering layer. The sandal according to claim 5, wherein the surface of the base layer is exposed on the toe side of the toe base contact portion. The sandal according to claim 5 or 6, wherein the heel-side covering layer has a two-layer laminated structure. Claims 5 to 7 wherein the base layer and the heel side covering layer are formed of a hard material, and the toe base contact portion and the toe side covering layer are formed of a material softer than the hard material. The sandals according to any one of the above items. The sandal according to any one of claims 1 to 8, wherein the anterior belt for positioning the instep of the base of the toe and the posterior belt for positioning the ankle are fixed to the sole. The sandal according to claim 9, wherein both ends of the rear belt are fixed to the left and right side surfaces of the sole, and the rising angle of the belt with respect to the bottom surface of the sole is within the range of 40 to 60 °. Auxiliary tools consisting of a bottom, an inner side wall and an outer side wall, wherein the thickness of the bottom at the boundary with the outer side wall is larger than the thickness of the bottom at the boundary with the inner side wall of the sandal. The sandal according to any one of claims 1 to 10, wherein the contact patch of the sole is fitted on the toe side from the midpoint between the toe and the heel so as to be in contact with the upper surface of the bottom of the auxiliary tool. Fitted into footwear consisting of a bottom, an inner side wall and an outer side wall, wherein the thickness of the bottom at the boundary with the outer side wall is greater than the thickness of the bottom at the boundary with the inner side wall. Auxiliary tool for.

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