Footwear

Abstract

To provide footwear capable of being put on without a crouching or sitting motion and without use of a shoehorn or a hand in a user's standing state.SOLUTION: Footwear has a heel part. A cross-section, which is cut in a horizontal direction so as to wrap a heel, is formed in a semicircular arc shape. The footwear comprises a first core material that is arranged in the heel part within an upper, and a second core material that is arranged above the first core material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

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

[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 protrusion extending upward and diagonally backward is formed at the top end of the heel, and the protrusion is equipped with a crescent-shaped core that includes a crescent-shaped core extension extending from a crescent-shaped core provided in the heel.

[0005] Specifically, the footwear of Patent Document 1 is a low shoe 11a having a heel 14 at the rear end, with a hard protrusion 16 extending diagonally upward and rearward at the top end of the heel 14. The protrusion 16 is provided with a crescent-shaped core extension 17b extending from a crescent-shaped core 17 provided in the heel 14 as a core to provide 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 has a curved shape with a concave inner side in cross section, and the contours of the tip 16a of the protrusion 16 are rounded to increase strength and soften the impact on the heel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese 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 protrusion are one continuous piece of core material, so the range of movement of the core to tilt backward is limited. Also, because the above structure firmly fixes the crescent-shaped core to the heel, allowing almost no movement, the heel has no flexibility and is uncomfortable when walking, etc.

[0008] The present invention has been made in view of the above points, and aims to solve the problems of the prior art. Specifically, the object of the present invention is to provide footwear that combines two core materials to provide flexibility above the heel, allowing the wearer to put on shoes while standing without bending over or sitting, without using a shoehorn or their 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 aspect of the present invention is characterized in that the heel portion has a cross section cut horizontally in the shape of a semicircular arc to encase the heel, the foot comprises a first core material arranged inside the upper, and a second core material arranged above the first core material, and the upper part of the heel portion extends at an angle diagonally backward from the vertical direction.

[0010] With this configuration, the upper part of the heel is tilted diagonally backward rather than vertically, and the core is arranged up to the upper part of the heel, so the heel does not twist when put on, allowing for smooth putting on. Also, because it is composed of two cores, the upper second core and the lower first core, the heel is not too stiff as with a single core, and it is flexible, making it easier to put on and take off than conventional shoes. Furthermore, even when wearing the footwear, the two cores do not make the heel too stiff as with a single core, making it less likely to interfere with walking and making it easier to walk.

[0011] This footwear is also characterized in that a lower portion of the second core overlaps the first core. With this configuration, the lower portion of the second core overlaps the first core, creating a seamless connection without gaps, ensuring a consistent strength throughout and providing flexibility to the upper portion of the second core. Furthermore, the lower portion of the second core overlaps the first core, preventing the edges of the first and second cores from interfering with the foot, which can occur if the two cores are 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 for a continuous core, improving the stability of the heel. Furthermore, by bonding only a lower portion of the second core to the first core and not the upper portion, the flexibility of the second core can be maintained.

[0013] This footwear is also characterized in that the second core is configured to be narrower at the bottom than at the top. This configuration minimizes the area where the foot comes into contact with the core while walking, improving comfort when walking. Furthermore, 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] The footwear is also characterized in that the second core has a shape resembling a mortar cut in the height direction, with the upper end of the roughly fan-shaped part expanding upward being rounded to form a convex arc shape that points backward. With this configuration, the second core acts as a shoehorn, making it easy to insert your foot.

[0015] This footwear is also characterized in that the second core is thinner than the first core. With this configuration, the first core is thicker, ensuring the strength of the heel and the shoe, while the second core is thinner, ensuring the flexibility of the second core. This achieves a balance between the rearward flexibility of the second core 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 0.2 mm to 2.0 mm, the thickness of the second core is in the range of 0.2 mm to 2.0 mm, and the thickness of the first core is greater than the thickness of the second core. This configuration achieves a balance 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 formed from 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. This configuration makes it easy to put on and take off, and holds the heel in place along the foot, making walking easier. Furthermore, because it is made from resin, it can be made lightweight.

[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, providing the strength to firmly hold the heel, ensuring the strength of the heel and shoe, while also making walking easier.

[0019] This footwear is also characterized by a cushioning material contained within the opening, with the height of the cushioning material being higher at the rear 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. Furthermore, the higher cushioning material at the rear of the opening, i.e., on the heel side, makes it difficult for the foot to slip off after wearing the footwear, resulting in footwear that is easy to put on but difficult to take off.

[0020] This footwear is also characterized in that cushioning material is contained inside the opening, and that the cushioning material is arranged only on the rear side of the opening. With this configuration, in the case of pumps, for example, the cushioning material is not arranged on the sides of the opening, but only on the rear side, which gives the opening a clean and elegant design, 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] The 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 it does not slip when putting your foot in, allowing you to put on the shoes without using your hands. Also, because one side of the tongue is sewn, the front opening through which shoelaces and the like are arranged is not simply restricted when putting on the footwear, making it easy to open.

[0023] This footwear is also characterized by the tongue being switched midway 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 tongue does not sag and block the opening, allowing the foot to be inserted smoothly into the footwear. Furthermore, even after putting on the footwear, the upright rear side of the tongue is less likely to interfere with the foot when walking.

[0024] The footwear is also characterized in that the tongue is switched by stitching the boundary between the rear and front sides. This configuration allows the tongue to be fixed without causing discomfort to the foot. This makes the footwear easy to put on and take off, and comfortable to walk in.

[0025] This footwear also includes shoelaces, which are made of rubber. This configuration eliminates the need to tie shoelaces when putting on or taking off the shoes, allowing you to put them on or take them off without using your hands. The movement of the rubber also widens the gap for your foot, making it easier to put on.

[0026] This footwear is also characterized by a slit formed on the side of the upper that continues from the opening, and a rubber material that biases the slit in the direction of closing the slit, which widens the gap for inserting the foot, making it easier to put on.

[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 in the opening part where the rubber belt or rubber cord is arranged. With this configuration, the sides of the opening are stretchable, widening the gap for inserting the foot and making it easier to put on. Furthermore, once the footwear is put on, the foot is less likely to slip off, making it easy to put on and difficult to take off. [Effects 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 explanation of the drawings]

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

[0030] Below, a footwear 10 according to one embodiment of the present invention will be described in detail. However, the present invention is not limited to this embodiment. Furthermore, the components in the following embodiment include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configuration can be made without departing from the spirit 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 second core separated from each other, and Fig. 3(b) is a side view of the overlapping first core and second core. Fig. 4 shows the overlapping first core and second core, with (a) a rear view, (b) a central cross-sectional view, and (c) a cross-sectional view.

[0032] As shown in FIG. 1, footwear 10 according to one embodiment of the present invention comprises an outsole 30 that constitutes the sole of a shoe, and an upper 20 that covers 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 so that it naturally steps 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 on the sole are not important.

[0034] The upper 20 includes an upper body 21 that covers the forefoot, 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 arranged to close an opening 23 that extends from the opening 24 to the approximate center forward in the width direction. The tongue 22 has a lower tongue section 22a extending from the front end to a sewn-on turn-over section 22c, and an upper tongue section 22b extending from the turn-over section 22c to the top end of the tongue (see FIG. 2). The sewn-on turn-over section prevents the tongue 22 from sagging and closing the opening. Furthermore, because the upper tongue section 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 be sewn to the upper body 21 on one side, so that the tongue 22 is easy to open without restricting the opening of the opening 23 and the opening of the shoe opening 24, making it easy to put on. 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 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 50 is made of rubber so that the opening 23 widens when the foot is put in. The lace 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 accommodated in the part in front of the opening 24, and the part behind the opening 24, i.e., the heel part 40, supports the heel of the person's foot.

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

[0041] Additionally, 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] In one example of this embodiment, the first core 60 is 1.2 mm thick and the second core 70 is 0.8 mm thick, with the second core 70 being thinner than the first core 60. This configuration allows the second core to flex rearward, while the thinner first core 60 has the strength to support the heel and core.

[0043] Note that the above is an 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, while the shoehorn-like shape of the second core 70 makes it easier to insert the foot. Furthermore, because the first core 60 and the second core 70 are made of resin, they can be made lightweight. However, the first core 60 and the second core 70 may be made of a material other than resin.

[0045] As shown in Figure 3(a), the first core material 60 is a counter whose cross section when cut horizontally is formed in a semicircular arc shape so as to encase the heel, and is firmly bonded 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 has a roughly fan-shaped configuration that spreads upward, but the top end is rounded to form a convex arc that projects backward, like a mortar cut in the height direction, and extends at an angle obliquely backward rather than vertically, making it easier to insert your feet.

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

[0048] As shown in Figure 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 prevents the heel portion from becoming too stiff as with a single core material, and provides flexibility, making it easier to put on and take off than conventional shoes. Even when wearing footwear, it is less likely to interfere with walking, making it easier to walk.

[0049] Furthermore, by bonding the upper part of the first core 60 and the lower part of the second core 70 to the heel portion 40 so that they overlap, a continuous core is formed without any gaps, ensuring a certain level of strength as a whole and a certain level of stability in the heel portion, while only a portion of the lower part of the second core 70 is bonded, allowing a certain level of flexibility to be imparted to the upper part of the second core. This also prevents the upper end of the first core 60 or the lower end of the second core 70 from interfering with the foot, which can occur if the first core 60 and the second core 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 located at the center in the width direction of the heel portion.

[0051] 4(b), in this embodiment, the first core 60 is bonded to the outside (rear side) and the second core 70 is bonded to the inside (front side). Alternatively, the first core 60 may be bonded to the inside and the second core 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 most bulging part of second core material 70 is substantially semicircular.

[0053] 1 and 4, the footwear 10 of this embodiment includes a cushioning material 80 around the periphery of the opening 24, through which the user inserts their foot. This allows the foot to be inserted smoothly into the footwear. The elasticity of the cushioning material 80 also provides a comfortable fit. In this embodiment, the material included around the periphery of the opening 24 is sponge, but any material with cushioning properties may be used; it 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] The footwear 10 of the first embodiment has been described as a sneaker with shoelaces, but 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 first embodiment described above, sneakers with laces are used as an example, but the present invention is not limited to sneakers and can also be applied to loafers, business shoes, etc. In the following, the same components as in the first embodiment are given the same reference numerals, and the description will mainly focus 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 according to the second embodiment has a loafer shape, but may also 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 the rear end that covers the heel area.

[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 it fits the foot better 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 multiple materials to improve durability, comfort, and appearance. For example, natural leather, synthetic leather, synthetic fiber, etc. may be used.

[0061] Upper 120 has strap 125 on the instep. The outer side of strap 125 is made of the same artificial leather as upper body 121, and rubber material is arranged on the inner side. This allows the rubber material to expand when putting your foot in, reducing the feeling of pressure on your foot.

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

[0063] The upper 120 of this embodiment has a straight cut at the opening 124, which allows the foot to slip in smoothly. Additionally, stretchable rubber can be applied to the periphery of the opening 124 to make it even easier to put on.

[0064] The toe portion of the upper 120 of this embodiment is stitched. The stitching may be horizontal, U-shaped, W-shaped, or decorative, such as holes or jewels. The shape of the toe portion 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 rubber, leather, or sponge. The thickness of the outsole, the pattern on the sole, and whether or not it has a heel are not important.

[0066] The footwear 100 also includes an insole 131. The insole 131 has 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] Furthermore, the insole 131 is made of a material that has a certain degree of slipperiness, which makes it easy to put on. On the other hand, if the 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, with the forefoot contained in the portion forward of the opening 124, and the portion behind the opening 124, i.e., the heel portion 140, supporting 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 interior of the upper along the opening 124, and gathered portions 150 are formed on both sides of the opening 124. The gathered portions 150 are stretchable due to the inner rubber material 151. Therefore, the stretchability of the gathers 150 causes the gathers to contract after the foot is put in, improving the fit. This makes it easier to walk after putting on the footwear, as the foot is less likely to slip out of the footwear.

[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 components as those in the first embodiment are given the same reference numerals, and the following description will mainly focus 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 size extending forward from opening 224 formed on both sides of upper body 221. 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] When footwear 200 is put on, slit 225 widens due to slit 225 and rubber belt 226, widening opening 224 and making it easy to put on. After the foot is fully put into footwear 200, slit 225 is urged in a closing direction by rubber belt 226, making it difficult for the footwear to slip off while walking. Even when footwear 200 is not being worn, slit 225 is urged in a closing direction by rubber belt 226, so the shape of footwear 200 is stable.

[0075] Furthermore, when putting on the footwear 200, the opening 224 is opened by the slit 225 and the rubber belt 226, and the heel portion 240 of the upper body 221 functions like a shoehorn due to the first core material 60 and the 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 also be applied to flat pumps made of artificial leather. In the following, the same components as in the first embodiment are given the same reference numerals, and the following description will mainly focus on the differences from the first embodiment.

[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, or ballet shoes.

[0078] Furthermore, similar to the first and second embodiments, the heel portion 340 inside the upper is provided with a lower first core material 60 and an upper second core material 70, 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 interior of the upper along the opening, and gathers 350 are formed on both sides of the opening. Gathers 350 are stretchable due to the rubber material 351 on the inside. Therefore, the stretch of gathers 350 causes the gathers to contract after the foot is put in, improving the fit. This makes it easier to walk after putting on the footwear, as the foot is less likely to slip out of the footwear.

[0080] Additionally, cushioning material 341 is contained within 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, gathered portion 350 causes the upper part of heel portion 340 to tilt toward the foot, so cushioning material 341 provides a comfortable fit and prevents 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 comfortable fit and creates friction, making the shoes less likely to slip off.

[0082] Footwear 300 uses smooth leather for upper surface 320 and includes smooth portion 324 extending from both ends of gathered portion 351 on the inside of the upper to the opening. In this embodiment, smooth portion 324 on the inside is made of thinner smooth leather than the smooth leather on the upper surface, creating a comfortable fit when worn. The presence of smooth portion 324 on the inside of the opening also contributes to a beautiful appearance without compromising the formal look.

[0083] The main part of the inside of the upper, other than the smooth part 324 and the suede part 342, is made of polyester part 323, which uses a polyester material. Polyester part 323 makes the shoe easy to wear, comfortable on the feet, and highly durable. Note that polyester is just one example, and other materials and synthetic fibers may also be used. The other materials mentioned above are also just examples of this embodiment, and other materials may also 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-described embodiment, the upper part of the first core 60 and the lower part of the second core 70 are bonded together so as to overlap, but the upper part of the first core 60 and the lower part of the second core 70 can also be configured so as to overlap but not be bonded together. This non-bonding configuration increases the flexibility of the portion above the heel corresponding to the second core 70. In this case, it is desirable to position the second core 70 on the rear side of the first core 60, and this configuration can prevent the lower part of the second core 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 part 151 Rubber 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 part 340 Heel 341 Cushioning material 342 Suede section 350 Gathered part 351 Rubber material

Claims

1. a first core material 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 disposed above the first core, The upper part of the heel part extends obliquely backward from the vertical direction. footwear.

2. The second core material is arranged so that a lower portion of the second core material overlaps with the first core material. Footwear according to claim 1.

3. A lower portion of the second core material is bonded to the first core material. Footwear according to claim 2.

4. The second core member is configured so that its lower portion is narrower than its upper portion. Footwear according to claim 1.

5. The second core material has a shape resembling a mortar cut in the height direction, in which an upwardly expanding, generally fan-shaped portion is rounded so that the upper end thereof is a convex arc-shaped portion facing backward. Footwear according to claim 4.

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

7. 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 6.

8. 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.

9. The upper part of the heel part extends obliquely backward from the vertical direction. Footwear according to claim 1.

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

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

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

13. The inner surface of the upper is made of a material that is more slippery than the outer surface. Footwear according to claim 1.

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

15. The tongue is switched midway in the front-to-back direction of the footwear, and the rear side is inclined more vertically than the front side. Footwear according to claim 14.

16. The tongue is characterized in that the transition is made by sewing the boundary between the rear side and the front side. Footwear according to claim 15.

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

18. A slit is formed on the side of the upper, continuing 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.

19. A rubber belt or rubber string 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 string is arranged. Footwear according to claim 1.

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