footwear

Abstract

To provide footwear which can be put on while standing without bending over or sitting down, and without using a shoehorn or hands. [Solution] This footwear has a heel portion, and is characterized in that a cross section cut horizontally to wrap around the heel is formed in a semicircular arc, and comprises a first core material arranged in the heel portion inside the upper, and a second core material arranged above the first core material.

Description

[Technical field]

[0001] The present invention relates to footwear having two types of core material. [Background technology]

[0002] When wearing traditional footwear with a heel, such as sneakers or business shoes, if you put them on without using a shoehorn or the like, the heel of the shoe may be crushed or may be damaged by being hit against the heel.

[0003] Therefore, in order to avoid crushing the heels, it is necessary to use a shoehorn or your hands when putting on shoes, but this requires bending or sitting down every time to put on shoes, which is troublesome.

[0004] Meanwhile, footwear that can be put on without using hands or a shoehorn has been proposed (for example, Patent Document 1). The footwear in Patent Document 1 is characterized in that a protruding piece extending diagonally upward and backward is formed at the upper end of the heel, and the protruding piece is equipped with one moon-shaped core that includes a moon-shaped core extension extended from a moon-shaped core provided in the heel as a core.

[0005] Specifically, the footwear of Patent Document 1 is a short shoe 11a having a heel 14 at its rear end, and a hard protrusion 16 is formed at the top end of the heel 14, extending diagonally upward and backward. The protrusion 16 is provided with a moon-shaped core extension 17b extending from a moon-shaped core 17 provided at the heel 14 as a core to obtain hardness. The height of the tip of the protrusion 16 is made higher than the height of the front end of the shoe opening 15. The protrusion 16 is also curved with a concave inner side in cross section, and the contour shape of the tip 16a of the protrusion 16 is rounded to increase strength and soften the impact on the heel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2022-139151 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the footwear of Patent Document 1, the core and the protruding piece are one continuous core material, so the range of motion of the core to fall backward is limited. Also, because the above-mentioned structure firmly fixes the crescent-shaped core to the heel, it allows almost no movement, so the heel has no flexibility when walking, making it uncomfortable.

[0008] In view of the above, the present invention aims to solve the problems of the conventional technology. Specifically, the present invention aims to provide footwear that combines two core materials to provide flexibility above the heel, allowing the wearer to put on the shoes while standing without bending or sitting down, without using a shoehorn or hands, and that is easier to put on and take off than conventional footwear, fits the foot well when worn, and is easy to walk in. [Means for solving the problem]

[0009] Footwear according to one embodiment of the present invention is characterized in that the heel portion has a semicircular cross section cut horizontally to wrap around the heel, the first core material is arranged inside the upper, and a second core material is arranged above the first core material, and the upper part of the heel portion extends at a diagonal rearward angle relative to the vertical.

[0010] According to this configuration, the upper part of the heel is inclined diagonally backward from the vertical direction, and the core material is arranged up to the upper part of the heel, so that the heel does not twist when wearing, and can be worn smoothly. In addition, since it is composed of two core materials, the upper second core material and the lower first core material, the heel does not become too stiff as in the case of a single core material, and it has flexibility, so it is easier to put on and take off than conventionally. In addition, even when wearing the footwear, since the core material is composed of two, the heel does not become too stiff as in the case of a single core material, so it is easy to walk without interference when walking.

[0011] This footwear is also characterized in that a lower part of the second core is arranged to overlap the first core. With this configuration, the lower part of the second core overlaps the first core, resulting in a seamless connection with no gaps, ensuring a certain level of strength overall and allowing the upper second core part to be flexible. In addition, the lower part of the second core overlaps the first core, preventing the end surfaces of the first and second cores from interfering with the foot, which could occur if the first and second cores were completely separated.

[0012] This footwear is also characterized in that a lower portion of the second core is bonded to the first core. This configuration allows the core to be made into a single piece, improving the stability of the heel. In addition, since only a lower portion of the second core is bonded to the first core and the upper portion is not bonded, the flexibility of the second core can be maintained.

[0013] This footwear is also characterized in that the second core is narrower at the bottom than at the top. This configuration minimizes the area where the foot touches the core when walking, improving comfort when walking. Also, by configuring the second core to be narrower at the bottom than at the top, the flexibility of the second core can be maintained even when the bottom is bonded to the first core.

[0014] In addition, this footwear is characterized in that the second core material has a shape resembling a cone-shaped mortar cut in the height direction, with the upper end of the roughly fan-shaped fan spreading upward being rounded into a convex arc shape toward the rear. With this configuration, the second core material functions as a shoehorn, making it easy to insert the foot.

[0015] This footwear is also characterized in that the second core is formed to be thinner than the first core. With this configuration, the strength of the heel and the shoe is ensured by making the first core thicker, and the flexibility of the second core is ensured by making the second core thinner. This makes it possible to balance the flexibility of the second core toward the rear and the strength of the first core to support the sole and core, making it easier to put on and take off and ensuring stability when walking.

[0016] This footwear is also characterized in that the thickness of the first core is in the range of 0.2mm to 2.0mm, the thickness of the second core is in the range of 0.2mm to 2.0mm, and the thickness of the first core is greater than the thickness of the second core. With this configuration, a balance can be achieved between the rearward flexibility of the second core and the strength of the first core to support the sole and core, making it easy to put on and take off, and the core has the strength to hold the heel when walking, making it easier to walk.

[0017] This footwear is also characterized in that the first core and the second core are made of a resin material made by solidifying hot melt resin. With this configuration, the first core is shaped to follow the curve of the heel, and the second core is shaped like a shoehorn. With this configuration, the footwear is easy to put on and take off, and the heel is held in place along the foot, making it easy to walk. Also, because it is made of resin, it can be made lighter.

[0018] This footwear is also characterized in that the first core material is a counter. With this configuration, the lower first core material serves as a counter, which has the strength to hold the heel firmly, ensuring the strength of the heel and shoe, while also making walking easier.

[0019] This footwear is also characterized in that the cushioning material is contained inside the opening, and the height of the cushioning material is higher at the rear side of the opening than at the sides of the opening. This configuration allows the foot to be inserted smoothly into the shoe, and the elasticity of the sponge member improves the feel of the opening. In addition, the cushioning material is configured to be higher at the rear side of the opening, i.e., the heel side, so that the foot is less likely to slip off after wearing the footwear, making it easy to put on but difficult to take off.

[0020] This footwear is also characterized in that a cushioning material is contained inside the opening, and the cushioning material is arranged only on the rear side of the opening. With this configuration, for example in the case of pumps, the cushioning material is not provided on the sides of the opening, but only on the rear side, resulting in a clean and elegant design for the opening, and the cushioning material on the rear side makes the pumps easier to put on with less friction, and they are less likely to slip off after being put on.

[0021] This footwear is also characterized in that the inner surface of the upper is made of a material that is more slippery than the outer surface, allowing the foot to be inserted smoothly into the footwear.

[0022] The footwear further includes a tongue, one side of which is sewn to the upper. With this configuration, the tongue is sewn to the upper, so that the tongue does not slip when the foot is put in, allowing the footwear to be put on without using hands. Also, with one side of the tongue sewn, the front opening through which shoelaces and the like are arranged is not simply restricted and can be easily opened, making the footwear easy to put on.

[0023] This footwear is also characterized in that the tongue is switched halfway between the front and rear of the footwear, with the rear side inclined more vertically than the front side. With this configuration, the rear side of the tongue, i.e., the opening side, is more upright than the front side, so the foot can be smoothly inserted into the footwear without the tongue sagging and blocking the opening. Also, even after wearing the footwear, the rear side of the tongue is upright, so it is less likely to interfere with the foot when walking.

[0024] In addition, this footwear is characterized in that the tongue is switched by sewing the border between the rear side and the front side. With this configuration, the tongue can be fixed without causing discomfort to the foot. Therefore, the footwear is easy to put on and take off, and comfortable to walk in.

[0025] The footwear further includes shoelaces, which are rubber shoelaces. With this configuration, there is no need to tie the shoelaces when putting on or taking off the shoes, and the shoes can be put on or taken off without using hands. Also, the rubber moves to widen the gap for the foot, making it easy to put on the shoes.

[0026] This footwear is also characterized in that a slit is formed on the side of the upper that continues from the opening, and a rubber material that biases the slit in a direction to close is provided on the inner surface of the upper. With this configuration, the gap for inserting the foot is widened, making it easier to put on the foot.

[0027] This footwear is also characterized in that a rubber belt or rubber cord is arranged inside the upper at a position on the side of the opening, and gathers are formed at the opening where the rubber belt or rubber cord is arranged. With this configuration, the sides of the opening stretch, widening the gap for inserting the foot and making it easy to put the foot on. In addition, after putting on the footwear, the foot is less likely to slip off, making the footwear easy to put on and difficult to take off. Effect of the Invention

[0028] According to the footwear of the present invention, shoes can be put on smoothly while standing, without bending over or sitting, and without using a shoehorn or hands. [Brief description of the drawings]

[0029] [Figure 1] 1 is a side view of footwear according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective view of a tongue portion of footwear 10. FIG. [Diagram 3] Side view (a) of the first core material and the second core material separated, and (b) of the overlapping side view. [Figure 4] Rear view (a), central cross-sectional view (b), and cross-sectional view (c) of the overlapping first and second core materials. [Diagram 5] FIG. 2 is a diagram showing a foot being inserted into the footwear 10 according to the first embodiment of the present invention. [Figure 6]FIG. 4 is a side view of footwear 100 according to a second embodiment of the present invention. [Figure 7] FIG. 2 is a side view of footwear 200 according to a third embodiment of the present invention. [Figure 8] FIG. 11 is a side view of footwear 300 according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] A footwear 10 according to one embodiment of the present invention will be described in detail below. Note that the present invention is not limited to this embodiment. Furthermore, the components in the following embodiment include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same. Furthermore, the configurations described below can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the configuration can be made without departing from the gist of the present invention.

[0031] First Embodiment Fig. 1 is a side view of footwear 10 according to a first embodiment of the present invention. Fig. 2 is a perspective view of the tongue portion of footwear 10. Fig. 3(a) is a side view of the first core and the second core separated from each other, and Fig. 3(b) is a side view of the overlapping first core and the second core. Fig. 4 shows the overlapping first core and the second core, with (a) being a rear view, (b) being a central cross-sectional view, and (c) being a cross-sectional view.

[0032] As shown in FIG. 1, footwear 10 according to one embodiment of the present invention comprises an outsole 30 constituting the sole of a shoe, and an upper 20 covering the instep of the foot, with the upper 20 having a heel portion 40 at its rear end that covers the area around the heel.

[0033] In this embodiment, the outsole 30 is made of, for example, a relatively hard rubber material, and has a rolling sole that supports the foot to naturally step forward. The outsole 30 may be made of any material other than rubber, such as leather or sponge. The thickness of the outsole and the pattern of the sole are not important.

[0034] The upper 20 includes an upper body 21 that covers the forefoot, a part of the midfoot, and the heel of the user. The design and material of the upper body 21 are not important.

[0035] The upper 20 also includes a tongue 22. The tongue 22 is disposed so as to close an opening 23 that is closed from the opening 24 to the front of the approximate center in the width direction. The tongue 22 has a tongue lower portion 22a that extends from the front end to a cut-back portion 22c that is made by sewing, and a tongue upper portion 22b that extends from the cut-back portion 22c to the top end of the tongue (see FIG. 2). The presence of the cut-back portion that is made by sewing prevents the tongue 22 from sagging and closing the opening. In addition, since the tongue upper portion 22b is upright, it is less likely to interfere with the foot when walking.

[0036] In this embodiment, the tongue lower part 22a and the tongue upper part 22b are configured to have one side sewn to the upper body 21, so that the tongue 22 is easy to open without restricting the opening 23 and the opening 24, making it easy to wear. Note that the tongue 22 can also be configured to be sewn to the upper body 21 on both sides with some room to spare, or to be made of a stretch material and bonded to the upper body 21 on both sides.

[0037] The upper 20 has a lace part 50 that connects the opening 23 of the upper body 21 so as to cover the tongue lower part 22a and the tongue upper part 22b. In this embodiment, the lace part 50 is made of rubber so that the opening 23 widens when the foot is put in. The lace part 50 may be made of, for example, cotton, polyester, linen, acrylic, silicone, suede, or ribbon.

[0038] In the upper 20 of this embodiment, the tongue lower portion 22a, the tongue upper portion 22b, and the upper body 21 are all made of the same material, but this is not limiting and each may be made of a different material.

[0039] The upper 20 has an opening 24 through which the foot is inserted, the forefoot is contained in the portion forward of the opening 24, and the rear portion of the opening 24, i.e., the heel portion 40, supports the heel of the person's foot.

[0040] In the upper 20 of this embodiment, the material on the inside is made of a material that is more slippery than the material on the outside, allowing the foot to be inserted into the footwear 10 smoothly.

[0041] Furthermore, the heel portion 40 of the upper body 21 contains the first core material 60 and the second core material 70, so that the heel portion 40 does not need to be crushed and the shoes can be put on smoothly without using the hands.

[0042] As one example of this embodiment, the first core material 60 is configured to have a thickness of 1.2 mm, and the second core material 70 is configured to have a thickness of 0.8 mm, with the second core material 70 being thinner than the first core material 60. This configuration allows the second core material to flex rearward, while the thinner first core material 60 has the strength to support the heel portion and the core material.

[0043] Note that the above is just one example of this embodiment, and the thickness of the first core material 60 is in the range of 0.2 mm to 2.0 mm, preferably 0.4 mm to 1.5 mm, and the thickness of the second core material 70 is in the range of 0.2 mm to 2.0 mm, preferably 0.4 mm to 1.5 mm, and the second core material 70 is thinner than the first core material 60.

[0044] As shown in FIG. 3(a), the first core 60 and the second core 70 are formed by solidifying a hot melt resin material and shaping the first core 60 to fit the curve of the heel portion 40. The curved shape of the first core 60 firmly holds the heel and stabilizes walking, and the shape of the second core 70 resembles a shoehorn, making it easier to insert the foot. In addition, since the first core 60 and the second core 70 are made of resin, they can be made lightweight. Note that the material of the first core 60 and the second core 70 may be a material other than resin.

[0045] As shown in FIG. 3(a), the first core material 60 is a counter that is cut horizontally to have a semicircular cross section so as to encase the heel, and is firmly attached to the outsole 30, providing the strength to hold the heel firmly, ensuring the strength of the heel portion 40 and the entire footwear, while also making walking easier.

[0046] The second core 70 is roughly fan-shaped and extends upward, with the top end rounded to form a convex arc shape that projects backward, like a cone cut in the height direction, and extends at an angle obliquely backward rather than vertically. This makes it easier to insert your feet.

[0047] In addition, the second core material 70 is narrower at the bottom than at the top, which minimizes the area where the foot comes into contact with the core material when walking, improving comfort when walking.

[0048] As shown in FIG. 3(b), the heel portion 40 is composed of two core materials, an upper first core material 60 and a lower second core material 70. This means that the heel portion is not too stiff as in the case of a single core material, and is flexible, making it easier to put on and take off than before. Even when wearing footwear, the sole is less likely to interfere with walking, making it easier to walk.

[0049] In addition, by bonding the upper part of the first core material 60 and the lower part of the second core material 70 to the heel part 40 so that they overlap, a single core material is formed without gaps, ensuring a certain level of strength as a whole and a certain level of stability in the heel part, while providing a certain level of flexibility to the upper part of the second core material because only a portion of the lower part of the second core material 70 is bonded. In addition, it is possible to prevent the upper end of the first core material 60 or the lower end of the second core material 70 from interfering with the foot, which can occur if the first core material 60 and the second core material 70 are completely separated.

[0050] As shown in FIG. 4(a), in this embodiment, the first core 60 and the second core 70 have a symmetrical shape with the highest part being located in the center in the width direction of the heel part.

[0051] 4(b), in this embodiment, the first core material 60 is bonded to the outside (rear side) and the second core material 70 is bonded to the inside (front side). Note that the first core material 60 may be bonded to the inside and the second core material 70 to the outside.

[0052] FIG. 4(c) is a diagram of second core material 70 viewed from above in the BB cross section of FIG. 4(b), and the part of second core material 70 that bulges most is substantially semicircular.

[0053] As shown in Figs. 1 and 4, the footwear 10 of this embodiment includes a cushioning material 80 around the periphery of the opening 24 into which the user inserts his or her foot. This allows the foot to be inserted smoothly into the footwear. The elasticity of the cushioning material 80 also improves the feel of the foot. In this embodiment, the material included around the periphery of the opening 24 is sponge, but any material with cushioning properties may be used, and is not limited to sponge.

[0054] In addition, the cushioning material 80 of this embodiment is higher on the rear side than both sides of the opening 24, making the footwear difficult to slip off after being put on, making it easy to put on but difficult to take off.

[0055] Although the footwear 10 of the first embodiment has been described taking sneakers with shoelaces as an example, it may be other sports shoes or other types of footwear.

[0056] <Second embodiment> Next, a second embodiment of the present invention will be described. In the above-mentioned first embodiment, sneakers with laces are used as an example, but the present invention is not limited to sneakers and can be applied to loafers, business shoes, etc. In the following, the same reference numerals are used for the same members as in the first embodiment, and the description will be centered mainly on the differences from the first embodiment.

[0057] 6 is a side view of footwear 100 according to a second embodiment of the present invention. Footwear 100 of the second embodiment has a loafer shape, but may be other footwear such as business shoes, formal shoes, or slip-ons.

[0058] Footwear 100 according to the second embodiment of the present invention includes an outsole 130 that constitutes the sole of a shoe, and an upper 120 that covers the foot. Upper 120 has a heel portion 140 at its rear end that covers the periphery of the heel.

[0059] The upper 120 of the second embodiment includes an upper body 121, the outer side of which is made of, for example, artificial leather so that the upper body 121 fits the foot as it is worn. The material of the upper body 121 may be genuine leather, synthetic leather, natural fiber, synthetic fiber, or the like.

[0060] The material on the inside of the upper body 121 of the second embodiment is a combination of a plurality of materials to improve durability, comfort, and appearance. For example, natural leather, synthetic leather, synthetic fibers, etc. may be used.

[0061] Upper 120 has a strap 125 on the instep. The front side of strap 125 is made of the same artificial leather as upper body 121, and rubber material is arranged on the inside. This allows the rubber material to spread when the foot is put in, reducing the feeling of pressure on the foot.

[0062] The front side of the strap 125 may be made of a different material than the front side of the upper body 121. The design may have two or more straps on the instep, or no straps at all. The straps may also have decorations such as metal fittings, ribbons, embroidery, fringes, and stones.

[0063] In the present embodiment, the upper 120 has an opening 124 formed with a straight cut, which allows the foot to be smoothly put on. Also, the periphery of the opening 124 can be made of elastic rubber to make it even easier to put on.

[0064] The toe part of the upper 120 of this embodiment is stitched. The stitches may be horizontal, U-shaped, or W-shaped, or may have decorations such as holes or jewels. The toe part may be rounded, pointed, or angular.

[0065] The outsole 130 of the footwear 100 of the second embodiment is made of a rubber material to prevent slipping. The outsole 130 may be made of any material other than rubber, such as leather or sponge. In addition, the thickness of the outsole, the pattern on the back, and the presence or absence of a heel are not important.

[0066] The footwear 100 also includes an insole 131. The insole 131 includes a bulge that supports the arch of the foot to reduce foot fatigue when walking. The insole 131 supports walking, and is provided with a cushion to reduce the weight on the sole of the foot.

[0067] Insole 131 is made of a material that has a certain degree of slipperiness. This makes it easy to put on. On the other hand, if insole 131 is too slippery, the foot will slip inside the footwear while walking, making it difficult to walk, so a material with a certain degree of slipperiness is preferable.

[0068] The upper 120 has an opening 124 through which the foot is inserted, the forefoot is contained in the portion forward of the opening 124, and the portion rearward of the opening 124, i.e., a heel portion 140, supports the heel of the person's foot.

[0069] Additionally, two core materials, a first core material 60 and a second core material 70, are combined and enclosed in heel portion 140 of upper 120. By combining the two core materials, first core material 60 and second core material 70, heel portion 140 does not easily break or collapse, and the foot can be smoothly inserted into the footwear, making it easy to wear.

[0070] Rubber material 151 is enclosed on both sides of the inside of the upper along the opening 124, and gathers 150 are formed on both sides of the opening 124. The gathers 150 stretch due to the rubber material 151 on the inside. Therefore, the gathers shrink after the foot is put in due to the stretch of the gathers 150, improving the fit. As a result, after putting on the footwear, the feet are less likely to slip off the footwear when walking, making it easier to walk.

[0071] <Third embodiment> Next, a third embodiment of the present invention will be described. In the first embodiment described above, sneakers with laces are used as an example, but the present invention is not limited to lace-up shoes, and can also be applied to slip-on sneakers and the like. In the following, the same reference numerals are used for the same members as in the first embodiment, and the description will be centered mainly on the differences from the first embodiment.

[0072] Fig. 7 is a side view of footwear according to a third embodiment of the present invention. As shown in Fig. 7, footwear 200 is configured without laces 50 or openings 23, unlike footwear 10 of the first embodiment.

[0073] Instead, footwear 200 has slits 225 of a predetermined dimension formed on both sides of upper body 221, continuing from opening 224 and extending forward. Rubber belts 226 are sewn to the inside of upper body 221 at positions corresponding to slits 225 and bias slits 225 in a direction to close them.

[0074] The slits 225 and the rubber belt 226 allow the opening 224 to widen when the footwear 200 is put on, making it easy to put on. After the foot is fully put into the footwear 200, the slits 225 are urged in a closing direction by the rubber belt 226, making it difficult for the footwear to slip off when walking. Even when the footwear 200 is not being put on, the slits 225 are urged in a closing direction by the rubber belt 226, so that the shape of the footwear 200 is stable.

[0075] In addition, when putting on footwear 200, opening 224 is provided by slit 225 and rubber belt 226 as described above, and heel portion 240 of upper body 221 functions like a shoehorn due to first core material 60 and second core material 70 contained therein, making it easy to put on.

[0076] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described. In the first embodiment described above, sneakers with laces are used as an example, but the present invention is not limited to sneakers and can be applied to flat pumps made of artificial leather. In the following, the same reference numerals are used for the same members as in the first embodiment, and the differences from the first embodiment will be mainly described.

[0077] Fig. 8 is a perspective view of footwear according to a fourth embodiment of the present invention. As shown in Fig. 8, footwear 300 is a flat pump, but may be other footwear such as genuine leather formal shoes, flat shoes, pumps, ballet shoes, etc.

[0078] Also, similar to the first and second embodiments, a lower first core material 60 and an upper second core material 70 are provided in the heel portion 340 inside the upper, thereby achieving the same effects as the first and second embodiments.

[0079] Additionally, footwear 300 has rubber material 351 embedded on both sides of the inside of the upper along the opening, and gathers 350 are formed on both sides of the opening. Gathers 350 stretch due to the rubber material 351 on the inside. Therefore, the stretch of gathers 350 causes the gathers to shrink after the foot is put in, improving the fit. This makes it easier to walk after putting on the footwear, as the feet are less likely to slip off the footwear.

[0080] Additionally, cushioning material 341 is contained in heel portion 340 inside the upper. The presence of cushioning material 341 makes the shoes easy to put on, less likely to slip off, and comfortable to the foot. In particular, since the gathers 350 cause the upper part of heel portion 340 to tilt toward the foot, cushioning material 341 provides a comfortable fit and does not cause pain when worn.

[0081] Additionally, footwear 300 has suede portion 342 attached to the inner side of heel portion 340. This suede material provides a good feel on the foot and creates friction, making the footwear less likely to slip off.

[0082] Footwear 300 uses smooth leather on upper surface 320, and includes smooth portion 324 from both ends of gather portion 351 on the inside of the upper to the opening. In this embodiment, inner smooth portion 324 is made of smooth leather that is thinner than the smooth leather on the upper surface side, and is configured to not feel uncomfortable when worn. Furthermore, the presence of smooth portion 324 on the inside of the opening does not impair the formal impression and provides an excellent appearance.

[0083] The inside of the upper is mainly made of polyester part 323 using polyester material, except for smooth part 324 and suede part 342. Polyester part 323 makes the shoe comfortable to wear, comfortable on the feet, and highly durable. Note that polyester is only one example, and other materials and other synthetic fibers may be used. The above-mentioned other materials are also only examples of this embodiment, and other materials may be used.

[0084] <5. Other embodiments> As described above, a preferred embodiment of the present invention has been described with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and various modified or altered examples within the scope of the claims also fall within the technical scope of the present invention.

[0085] For example, in the above embodiment, the upper part of the first core material 60 and the lower part of the second core material 70 are bonded so as to overlap each other, but the upper part of the first core material 60 and the lower part of the second core material 70 may be bonded so as to overlap each other without being bonded. By adopting such a non-bonded configuration, the flexibility of the part above the heel corresponding to the second core material 70 is increased. In this case, it is preferable to dispose the second core material 70 on the rear side of the first core material 60, and by adopting such a configuration, it is possible to prevent the lower part of the second core material 70 from interfering with the person's foot. [Explanation of symbols]

[0086] 10. Footwear 20 Upper 21 Upper body 22 Tan 22a Lower Tongue 22b Upper Tongue 22c Turning point 23 Opening 24 Opening 30 Outsole 40 Heel 50 String section 60 First core material 70 Second core material 80 Cushioning material 100 Footwear 120 Upper 121 Upper body 124 Opening 125 Strap 130 Outsole 131 Insole 140 Heel 150 Gathered section 151 Rubber material 200 Footwear 220 Upper 221 Upper body 224 Opening 225 Slit 226 Rubber Belt 240 Heel 300 Footwear 320 Upper body 323 Polyester Section 324 Smooth section 340 Heel 341 Cushioning material 342 Suede section 350 Gathered section 351 Rubber material

Claims

1. A first core material is disposed inside the upper, the first core material having a cross section cut horizontally in a semicircular arc shape in the heel portion so as to wrap around the heel, A second core material is disposed above the first core material, The upper part of the heel portion extends obliquely backward from the vertical direction, The second core material is configured so that the width is narrower at the bottom than at the top, and has a shape resembling a rounded mortar shape cut in the height direction so that the upper end of the fan-shaped fan spreading upward is a convex arc shape toward the rear, Footwear, characterized in that a lower portion of the second core material is arranged so as to overlap the first core material, further forward than the first core material.

2. The second core material is characterized in that a lower part of the second core material is bonded to the first core material. Footwear according to claim 1.

3. The second core material is formed to be thinner than the first core material. Footwear according to claim 1.

4. The thickness of the first core material is in the range of 0.2 mm to 2.0 mm; The thickness of the second core material is in the range of 0.2 mm to 2.0 mm; The thickness of the first core material is greater than the thickness of the second core material. Footwear according to claim 3.

5. The first core material and the second core material are formed of a resin material obtained by solidifying a hot melt resin. Footwear according to claim 1.

6. The first core material is a counter. Footwear according to claim 1.

7. Cushioning material is embedded inside the opening, The height of the cushioning material is higher at the rear side of the opening than at the side of the opening. Footwear according to claim 1.

8. Cushioning material is embedded inside the opening, The cushioning material is disposed only on the rear side of the opening portion. Footwear according to claim 1.

9. The inner surface of the upper It is characterized by being made of a material that is more slippery than the outer surface. Footwear according to claim 1.

10. Further equipped with a tongue, One side of the tongue is sewn to the upper. Footwear according to claim 1.

11. The tongue is switched midway in the front-to-back direction of the footwear, The rear side is inclined more vertically than the front side. Footwear according to claim 10.

12. The tongue is characterized in that the border between the rear side and the front side is sewn. Footwear according to claim 11.

13. Equipped with shoelaces, The shoelace is a rubber shoelace. Footwear according to claim 1.

14. A slit is formed on the side of the upper, leading from the opening. A rubber material that biases the slit in a direction to close the slit is provided on the inner surface of the upper. Footwear according to claim 1.

15. A rubber belt or rubber cord is arranged inside the upper at a side position of the opening, and gathers are formed at the opening part where the rubber belt or rubber cord is arranged. Footwear according to claim 1.

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