JP2022174545A - Japanese sandals - Google Patents

Abstract

To provide Japanese sandals that can alleviate the deformation of feet of the person who puts on it, by promoting the movement of the toes.SOLUTION: Japanese sandal 1 has a base 10, and a clog thong 40 with a maetsubo (center strap) 41 like a band having a width in a longitudinal direction of the base. The base is a molding made of synthetic resin. A first cover 17 covering the top face of the base and a second cover 20 further covering a partial area of the top face of the first cover are provided. The second cover 20 has a predetermined thickness to form a level difference 24 with the surface of the first cover at a front side edge 22 along a foot breadth direction. The front side edge has a V shape along a line connecting dent between balls and roots of all toes of a sole. The V shape has its apex located closer to a little finger than a position of insertion into the base of the maetsubo (center strap). An edge side line 23 on a thumb side extends from the apex to the back of the insertion position of the maetsubo (center strap).SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a sandal that can be expected to have the effect of promoting toe exercise just by wearing it and eliminating the collapse of the foot shape that causes poor physical condition.

In recent years, foot health has been attracting attention as a factor that affects mental and physical health. Stress is applied to the muscles of the knees, hips, back, shoulders and neck due to the uneven center of gravity caused by the collapse of the foot shape and the posture of the feet, which leads to physical and mental disorders such as joint pain, stiff shoulders, and headaches.

One of the main causes of the collapse of the foot shape is pressure on the toes due to continuous wearing of tight shoes such as high heels and tapered leather shoes. Compression of the toes results in deformities of the toes such as thumb valgus, pinky varus, and floating toes. Due to these deformations of the toes, it is impossible to firmly step on the ground with all the toes, and the user walks with the center of gravity biased toward the heel.

The body naturally tries to correct this bias in the center of gravity, and the posture deteriorates, such as walking with bent knees as if taking a forward leaning posture, or a stooped back with a rounded back. When this deteriorating posture becomes a habit, stress builds up on the joints and muscles throughout the body, resulting in the aforementioned discomfort.

Therefore, various types of footwear that can be used on a daily basis have been developed for the purpose of eliminating the collapse of the shape of the foot so that the whole toe can step firmly on the ground and the body can be supported by the entire sole. Among them, the first thing that is being considered is a form that allows the space between the fingers to be widened. In particular, sandals-type footwear is considered preferable for countermeasures against bunions.

The general structure of a sandal is that the upper surface of a pedestal with a foot-shaped outline is covered with a decorative sheet to form a surface called 'ten' on which the sole of the foot rests, and a V-shaped thong is inserted. there is The thong is composed of a front tsubo sandwiched between the big toe and the second toe at the front end, and two horizontal thongs extending rearward on both left and right sides from the front tsubo and applied to the instep. Therefore, just by wearing the sandals, the front tsubo between the thumb and the second finger exerts the function of separating the fingers. In addition, all fingers can be moved freely without being pressed from the outside to the inside.

Some sandals are based on sandals having such thongs, and are further equipped with a mechanism to widen the space between fingers. For example, Japanese Patent Laid-Open No. 2002-100001 discloses a toe-pressing surface that is provided with a ridge that is inserted into the middle of each toe to expand the skeleton into a fan shape. In addition, there is also considered acupuncture zori, which aims to promote health by promoting blood circulation and acupressure by providing a large number of protrusions on the base surface of the sandals to stimulate pressure points on the soles of the feet (see, for example, Patent Document 2). ).

Japanese Utility Model Laid-Open No. 02-96902 JP-A-2000-287701

However, simply widening the space between the toes or wearing sandals with a pressure point function only temporarily promotes blood circulation and provides a sense of release between the toes. In order to sustainably eliminate the discomfort, it is necessary to exercise the toes in a positive manner so as to fundamentally eliminate the collapse of the foot shape. For example, it is a repetitive and frequent Gooper movement in which all toes are gripped tightly or loosened and spread apart.

SUMMARY OF THE INVENTION An object of the present invention is to provide sandals that promote toe movement and that can eliminate the collapse of the shape of the foot just by wearing it.

In order to achieve the above object, the sandals according to the invention of claim 1 include a pedestal, a front mounting hole formed in the front part of the pedestal, and a front end of the front tsubo inserted and fixed on the pedestal. Each end of two horizontal straps extending rearward on both left and right sides from the front base is inserted into and fixed to two rear mounting holes formed near the left and right edges of the rear part of the base. A sandal having a belt-like thong having a width in the front-rear direction,
The pedestal is a molded article made of synthetic resin, and is provided with a first covering member that covers the upper surface of the pedestal and a second covering member that further covers a partial region of the upper surface of the first covering member. and
The second covering member has a predetermined thickness that forms a step with respect to the surface of the first covering member on the front edge extending in the lateral width direction of the foot,
The front side edge has a dogleg shape along a line connecting the depressions between the pads of all the toes and the base of the sole, and the top of the dogleg is inserted into the pedestal of the front tsubo. The edge line on the thumb side extends from the top to the rear of the front tsubo.

The sandals according to the invention of claim 2 are characterized in that, in the sandals according to claim 1, the thickness of the front edge forming the step of the second covering member is 2 mm to 10 mm. It is.

The sandals according to the invention of claim 3 are the sandals according to claim 1 or 2, wherein the pedestal is provided with a mountain-shaped protrusion over an area where the roots of the second to fourth toes of the sole abut. There is.

The sandals according to the invention of claim 4 are the sandals according to any one of claims 1 to 3, wherein the two horizontal straps of the thong have a band shape with a width, and the thumb The width of the side cord is maximized at the base of the thumb, and the maximum width is larger than the width of the little finger side cord at the symmetrical position.

In the sandals according to the present invention, the gap between the big toe and the second toe is widened just by wearing the sandals, and when stepping out, all the toes are naturally caught in the step formed by the thickness of the front side edge of the second covering member. Since the goo state of gripping and grasping is obtained, the gooper movement of the toes is easily promoted just by walking, and as a result, the muscles of the toes are strengthened, and there is an effect that the collapse of the foot shape can be resolved. Therefore, the effect of being able to eliminate various mental and physical disorders caused by the collapse of the footprint can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic overall configuration diagram of a sandal for left foot as one embodiment of the present invention, (a) is a side view on the thumb side, (b) is a perspective view in which (a) is slightly tilted, and (c) is on the toe side. (d) is a state diagram when the sandals of (c) are worn. FIG. 1 is a side view of the little finger side part of the sandals of FIG. 1, (a) is an enlarged side view of the toe part, and (b) is a schematic enlarged view of the toe part showing only the pedestal in the AA partial cross section of FIG. 1 (c). is. FIG. 2 is a schematic overall configuration diagram of the sandals of FIG. 1 seen from the little finger side, (a) is a perspective view, and (b) is a state diagram when the sandals of (a) are put on and stepped on.

In the sandals according to the present invention, a pedestal and two front attachment holes formed in the front part of the pedestal are fixed by inserting the tip of the front tsubo and are formed near the left and right edges of the rear part of the pedestal. each end of two horizontal straps extending rearward on both left and right sides from the front base is inserted into and fixed to the rear attachment hole, and the front base is a belt-shaped strap having a width in the front-rear direction of the base; wherein the pedestal is a molded product made of synthetic resin, and includes a first covering member that covers the upper surface of the pedestal, and a second covering member that further covers a partial region of the upper surface of the first covering member 2 covering members are provided, and the second covering member has a predetermined thickness that forms a step with respect to the surface of the first covering member on the front side edge extending in the lateral width direction of the foot, The front side edge has a dogleg shape along a line connecting the depressions between the pads of all the toes and the base of the sole, and the top of the dogleg is inserted into the pedestal of the front tsubo. The edge line on the thumb side extends from the apex to the rear of the front ridge position.

With the above structure, just by putting on the sandals of the present invention, first, the front tsubo is sandwiched between the big toe and the second toe in a natural state, thereby widening the space between the toes. Moreover, since the front tsubo is band-shaped with a width in the front-rear direction, it urges the fingers in the direction of separating them from each other along the length of the fingers, so that it acts effectively in the direction of resisting the valgus of the thumb. do. Hallux valgus is a state in which the MTP joint (consisting of the distal metatarsal bone and the proximal proximal phalanx) at the base of the big toe protrudes outward, and the fingertip is bent toward the little finger so as to overlap the second toe. Therefore, the toe tip of the big toe continues to receive the biasing force in the direction away from the second toe, which promotes elimination of the hallux valgus.

In addition, since the toe length of an individual differs depending on the foot size, the effective minimum width of the front tsubo between the big toe and the second toe also differs. On the other hand, for sandals products, for example, it is normal to classify foot sizes according to foot size, such as S, M, L, and LL. It is preferable to set the width substantially in the range of 10 mm to 20 mm. In addition, by inclining the front tsubo backwards with respect to the pedestal surface, the biasing area of the thumb and the second finger in the separating direction increases along the inclination of the crotch of the fingers, and the action of spreading the thumb outward is enhanced. effectively exerted. The rear inclination angle of the front tsubo with respect to the pedestal surface is preferably in the range of 45 degrees to 65 degrees corresponding to the inclination of the crotch. Outside this range, it does not follow the inclination of the crotch of the fingers, and if the inclination is too strong, the insertion of the front tsubo between the fingers is hindered, making it difficult to wear. becomes smaller and the effect of the biasing force is reduced.

In addition, the front tsubo needs to have a certain thickness in order to effectively exert the urging force in the separating direction against the thumb and the second finger. Preferably, it ranges from 5 mm to 8 mm at its maximum thickness. If the thickness is less than this lower limit, the gap between the fingers is small and the biasing force is less likely to occur. On the other hand, if the thickness is more than the upper limit, the crotch of the finger spreads too much, and depending on the case, pain may be felt, making it difficult to continue wearing. Even if the thickness of the front tsubo is relatively large, by including a cushioning material inside the front tsubo, it is possible to alleviate irritation to the crotch of the fingers and make it easier to continue wearing the sandals of the present invention.

Furthermore, in the present invention, the front edge of the second covering member further provided on the upper surface of the first covering member covering the upper surface of the pedestal is, depending on the thickness, between the belly and root of all the toes of the sole. Since the step is formed in a dogleg shape along the line that connects the indentations, if you step on your toes while wearing sandals, the rear part of all toes including the big toe will naturally catch on the step. It becomes a goo action that grabs the edge, and while walking with the shoes on, the gooper movement is naturally encouraged and repeated.

In the present invention, the dogleg-shaped front edge forming the step is positioned such that the top of the edge line is located on the little finger side from the insertion position of the front tsubo, and the edge line on the thumb side is located from the top to the insertion of the front tsubo. It extends to the rear of the toe position and is positioned so that the thumb can reliably grasp the step with a goo action, so the muscles of all toes are strengthened and the collapse of the entire foot shape is easily resolved. As for the position of the edge line on the thumb side, we aim to be able to accommodate the thumbs of almost all people.

In particular, the length of the big toe varies from person to person, and even if the size of the foot is the same, it is not exactly the same. It turned out that it is good to set so that the step comes closer. Specifically, the distance from the center position of the edge line on the thumb side of the dogleg-shaped front edge to the front edge of the base is 18 to 18 to the maximum length of the sandals in the front-rear direction, which corresponds to the total length of the foot. A range of 22% is preferred, and a more average range of 19-20% is preferred.

Moreover, the thickness of the front side edge forming the step is preferably in the range of 2 mm to 10 mm, where the fingertip can easily get caught. If the thickness is less than this lower limit, the catching is insufficient and there is little difference in the presence or absence of steps. If it exceeds 10 mm and is too thick, the steps may be too high and it may become difficult to walk.

In addition, the sandals of the present invention are desired to be lightweight so that they can be used frequently in daily life other than when going to work or school. Among various types of conventional sandals, lightweight ones use cork cut products or molded products made of synthetic resin such as polyurethane (PU) or ethylene vinyl acetate (EVA) resin as bases. Also in the sandals of the present invention, it is preferable to employ a lightweight material for the pedestal. Among them, the EVA resin is preferable because it is lighter in weight and does not deteriorate with age due to hydrolysis unlike polyurethane. Also, EVA may be blended with other resins to improve wear resistance and durability.

In addition, the pedestal can be integrally molded into any shape if it is a thermoplastic material that can be molded by a mold, including EVA. For example, it is easy to integrally form non-slip projections and grooves on the bottom surface of the pedestal, which is the bottom surface of the sandals. In addition, molds can be used to create curvilinear cross-sectional shapes in which the thickness changes continuously over the entire length, such as by curving the toe of the pedestal or hollowing out the center.

Furthermore, if the pedestal is provided with a mountain-shaped projection over the area where the roots of the second to fourth toes of the sole abut, the mountain-shaped projection can be formed even after the first covering member and the second covering member are overlapped. part appears on the top. This convex portion pushes up the roots of the second to fourth toes on the sole in a slightly mountain-like shape, making it easier to maintain the arch along the left-right width direction of the foot. This lateral arch, together with the arch of the foot in the front and back direction, is necessary for the spring action that generates the power when stepping out, the cushion action that absorbs the impact at the time of landing, and the stability action when standing on one foot. However, it is believed that even in the spread-leg state with the arch crushed, a twisting force is likely to be applied to the base of the big toe, and bunions are likely to occur.

In addition, the thong has two horizontal thongs on the big toe side and a horizontal thong on the little finger side that extend backward from the front tsubo in an inverted V shape and hang over the instep of the foot. In order to make it easier to wear and walk on a daily basis, the horizontal cord is not a thin string, but has a certain width so that it gently hits the instep.

In addition, it is preferable that the lateral strap on the thumb side is wider than the lateral strap on the little finger side so that the MTP joint portion protruding outside the base of the thumb can be covered. In the state of bunions, when wearing general sandals, the thin horizontal strap hits the protruding part at the base of the thumb and causes pain. is avoided. In addition, it is possible to painlessly support the urging of the thumb away from the second finger to the outside.

Specifically, for example, the horizontal strap on the little finger side has a width of about 1.5 to 2.5 cm, and the horizontal strap on the thumb side has a shape that maximizes the width of the part that hits the base of the thumb. , a maximum width of about 3 to 5 cm. Alternatively, the width is about 1.2 to 3 times the width of the little-finger-side horizontal cord that is symmetrical to the maximum width position of the thumb-side horizontal cord.

Moreover, it is desirable that the horizontal cord has a cushioning property. For example, by inserting a cushioning material such as a polyurethane foam into a cloth having a predetermined outer shape, folding the fabric, and sewing the ends together, a lateral strap having a cushioning property can be easily produced. It is possible to form the front tsubo by integrally forming the tip portion to be the front tsubo with the horizontal cord and sewing the tip portions of the left and right horizontal cords together. In this case, there is no need to prepare a separate member for the front tsubo, and when the fabric is cut, the width and inclination of the portion corresponding to the front tsubo can be arbitrarily determined.

In addition, in the construction of the sandals of the present invention, it is the second covering member that actually comes into direct contact with the sole of the foot. For example, first of all, it is preferable to eliminate the discomfort caused by the wetness of the soles of the feet. Therefore, tatami facing sheets made of natural or artificial rush materials are suitable. Rush has a humidity control function, a moisturizing function, and a heat insulating function. The unique scent of natural rush gives a sense of cleanliness and coolness.

As a method of providing such a tatami facing sheet as a second covering member on top of the first covering member, sewing may be used in addition to sticking with an adhesive or the like. However, in order to prevent the edges of the tatami facing sheet from coming into direct contact with the soles of the feet, the edge of the tatami facing sheet is covered with a different hem cloth around the entire circumference of the tatami facing sheet, similar to sewing through the edge of the tatami facing. and sew it to the pedestal.

As for the first covering member, since the surface of the first covering member is substantially only touched by the pad of the toe protruding from the second covering member, it is not particularly limited as long as it has a moderately smooth surface. not something. However, since it is desired to have relatively high mechanical strength, resistance to tearing, low cost, and easy molding, for example, synthetic resin materials such as polypropylene and polyester are suitable. The attachment to the upper surface of the pedestal may be performed by adhesion using an adhesive or fusion, or by sewing as in the case of the second covering member.

A sandal according to one embodiment of the present invention is shown in FIGS. 1-3. Here, for the sake of simplicity of explanation, the sandals for the left foot, which are bilaterally symmetrical, will be described as an example, and illustration and description of the sandals for the right foot will be omitted. Figure 1 (a) is a side view of the thumb side, (b) is a perspective view slightly tilted from (a), (c) is a perspective view from the toe side, and (d) is the sandal shown in (c). It is a state diagram when worn. FIG. 2(a) is an enlarged side view of the toe portion on the little finger side, and FIG. 2(b) is a schematic enlarged view of the toe portion showing only the pedestal in the AA partial cross section of FIG. 1(c). FIG. 3(a) is an overall perspective view seen from the little finger side, and FIG. 3(b) is a state diagram when the sandals of FIG. 3(a) are put on and stepped on.

The sandals 1 according to the present embodiment are based on a base 10 made of non-foamed EVA, and include an upwardly warped toe portion 11 and a heel portion 12 with chamfered edges. A locking projection 14 and a groove 15 are formed. Furthermore, the upper surface has a gentle concave shape from the toe to the heel, and a mountain-like convex portion 16 is provided over the area where the roots of the second to fourth toes are in contact. The pedestal 10 having such a shape can be easily manufactured as an integrally molded product, for example, by injection molding a thermoplastic material into a mold, or by pressurizing and heating a pellet-like material in a mold.

The upper surface of the pedestal 10 is covered with a first covering member 17 made of, for example, a plastic sheet with relatively low water absorption such as polypropylene or polyester. The mounting of the first covering member 17 on the surface of the pedestal is accomplished by sewing via another hem cloth 18 edging the entire circumference.

On the front (top) surface of the pedestal 10 to which the first covering member 17 is attached, a front attachment hole 30 is formed at a position near the thumb from the center of the front portion for attaching the thong 40. Two rear mounting holes (31, 32) are formed near the edge.

A second covering member 20 is further mounted on the upper surface of the first covering member 17 to cover a partial area thereof. The front attachment hole 30 and the rear attachment holes (31, 32) are set so as to be located outside the area of the second covering member 20. As shown in FIG. The second covering member 20 is a tatami facing sheet made of a natural rush member or an artificial rush member such as Japanese paper. sewn on.

A front edge 22 of the second covering member 20 extending in the foot width direction has a thickness of 2 to 10 mm and forms a step 24 with respect to the surface of the first covering member 17 . This front side edge 22 is doglegged along the line connecting the depressions between the pads and bases of all the toes on the sole. An edge line 23 extends from the top of the dogleg to the rear of the front attachment hole 30 for the front tsubo. Specifically, the distance Y from the central position of the edge line 23 on the thumb side to the front end of the base is 19 to 20% of the maximum total length X of the sandals corresponding to the size of the foot.

Here, the case of the S-size sandals 1 having the maximum total length X=23 cm will be exemplified as this embodiment. In this sandal 1, the distance Y is 45 mm, which is about 19.6% of the total length X. The sandals 1 are set so that when the toes goo on most S-sized feet, the big toes can surely grasp the step 24 of the edge line 23 on the big toe side with the pads of the toes.

Also, in the front mounting hole 30 and the left and right rear mounting holes (31, 32) formed in the region of the first covering member 17, the tip of the front tsubo 41 of the thong 40 and the left and right sides rearward from the front tsubo 41 are provided, respectively. Each end of the extending horizontal strap 42 on the little finger side and horizontal strap 43 on the thumb side is inserted and fixed.

The thong 40 in this embodiment is composed of two horizontal thong base materials. That is, each of the horizontal cords (42, 43) is provided with an extending portion at the front end thereof, and the extending portions are sewn together to form the front tsubo 41. As shown in FIG. Therefore, in the thong 40, the front tsubo 41 and each of the lateral thongs (42, 43) are continuous. Each of the two horizontal cord base materials is formed into a belt shape having a predetermined width by folding a sheet of cloth, inserting a cushioning material such as polyurethane, and sewing the ends together. As the fabric, a wide variety of commonly used fabrics such as polyester, cotton, and mixed fabrics thereof can be widely used.

In this embodiment, the horizontal cord 42 on the little finger side has a gentle curve from the front end to the rear end so that the center is slightly wider. The width of the front and rear ends of the S-size sandals 1 was about 15 mm, and the width of the central part was about 25 mm. Similarly, the horizontal strap 43 on the thumb side is also formed in a belt shape by folding a piece of fabric, inserting a cushioning material into the folded fabric, and sewing the fabric together. The horizontal straps (42, 43) having a certain degree of width and cushioning properties are gentle on the instep and easy to wear on a daily basis.

The front and rear ends of the horizontal cord 43 on the thumb side have the same width as the horizontal cord 42 on the little finger side. The width is 1.5 times or more the width d. In the S size sandals 1 here, the width d of the horizontal strap 42 on the little finger side was set to about 20 mm, whereas the maximum width D of the horizontal strap 43 on the thumb side was set to about 35 mm. Since the wide part of the horizontal strap 43 on the thumb side touches the root part of the thumb so as to cover the base part of the thumb, even if the thumb is a hallux valgus, it touches so as to wrap the projecting part and is easy to wear without feeling pain. Further, the front base 41 can support the thumb to resist the valgus and be urged in the direction away from the second finger.

The front tsubo 41 of the thong 40 is formed by stitching together the extending portions from the front ends of the two horizontal thongs (42, 43) as described above, and both portions have a cushioning material inside. Even if the thickness of the front base 41 is relatively large, the thumb and the second finger can be biased away from each other without making the fingers feel pain. Furthermore, the front tsubo 41 has a belt-like width in the front-rear direction of the pedestal and is inclined rearward. The second finger can be spread well. In the S-size sandals 1 of this embodiment, the front tsubo 41 has a maximum thickness of about 5 mm, a width of 10 to 15 mm, and a rear inclination angle α from the base surface of 55 degrees.

In addition, since the pedestal 10 is provided with a mountain-shaped convex portion 16 over the area where the roots of the second to fourth toes of the sole abut, the first covering member 17 and the second covering member 20 overlap each other. The convex portion 16 appears even in the folded state. The convex portion 16 tends to keep the arch of the sole in the right and left width direction. In the collapsed state of the arch, the torsional force on the base of the thumb, which can aggravate the bunion, can be avoided.

When the sandals 1 of this embodiment having the above structure are put on, the space between the thumb and the second finger is widened. Then, as shown in FIG. 3(b), when you are about to take a step at the beginning of walking, if you bend the instep upward while holding your fingertips firmly, the pads of all toes will be on the front edge of the second covering member 20. It catches on the step 24 of 22 and naturally makes a goo motion of gripping this step 24, and only by continuing walking promotes gooper motion and can be easily repeated.

In the above examples, an example of S-size sandals was shown, but the material of each part is not limited to this, and can be selected as appropriate. As for the numerical value setting, for example, if the product is prepared by setting the numerical value according to the conditions according to the size of M, L, LL, etc., the effect of the present invention can be applied to people with various foot sizes. is exhibited.

1: sandals 10: pedestal 11: toe portion 12: heel portion 13: bottom surface 14: protrusion 15: groove 16: convex portion 17: first covering member 18: edge cloth 20: second covering member 21: edge cloth 22 : Front side edge 23: Thumb side edge line 24: Step 30: Front attachment holes 31, 32: Rear attachment hole 40: Nose strap 41: Front tsubo 42: Little finger side side strap 43: Thumb side side strap

Claims (4)

A base and a front mounting hole formed in the front part of the base are fixed by inserting the tip of the front base. each end of two horizontal straps extending rearward on both left and right sides from the pedestal is inserted and fixed; ,
The pedestal is a molded article made of synthetic resin, and is provided with a first covering member that covers the upper surface of the pedestal and a second covering member that further covers a partial region of the upper surface of the first covering member. and
The second covering member has a predetermined thickness that forms a step with respect to the surface of the first covering member on the front edge extending in the lateral width direction of the foot,
The front side edge has a dogleg shape along a line connecting the depressions between the pads of all the toes and the base of the sole, and the top of the dogleg is inserted into the pedestal of the front tsubo. A sandal, characterized in that it is located on the little finger side of the raised position, and the edge line on the thumb side extends from the top portion to the rear of the raised position of the front tsubo. 2. The sandal according to claim 1, wherein the thickness of the edge forming the step of the second covering member is 2 mm to 10 mm. 3. The sandal according to claim 1, wherein the pedestal is provided with a mountain-shaped protrusion over a region where the roots of the second to fourth toes of the sole abut. The two horizontal straps of the strap have a band shape with a width, the width of the horizontal strap on the thumb side is maximized at the base of the thumb, and the maximum width is at a symmetrical position. 4. The sandal according to any one of claims 1 to 3, wherein the width of the horizontal strap on the little finger side is larger than that of the horizontal strap.

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