Moon-shaped core, footwear

Abstract

To provide footwear that is easy for anyone to wear. [Solution] A moon-shaped core 113 including a rear end 123 corresponding to the position of the heel of the foot of the person wearing the footwear, a protruding portion 120 protruding rearward and diagonally upward from above the rear end, a first side portion 121 located on the arch side of the foot of the person wearing the footwear, and a second side portion 122 located on the opposite side of the arch of the foot of the person wearing the footwear, wherein the rear end, first side portion, and second side portion are arranged in a roughly J-shape as a whole in a planar view, the first side portion is configured to be 30% to 40% of the total length of the main body portion in the front-to-back direction in a planar view, and the second side portion is configured to be 20% to 25% of the total length of the main body portion in a planar view, and the first side portion is configured to be in a sloped shape such that the height between the first side portion and the sole portion gradually decreases as the upper end portion moves from the protruding portion to the front of the main body portion.

Description

[Technical Field]

[0001] The present disclosure relates to footwear, particularly low boots, and lunula cores for use in footwear. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2022-139151 (Patent Document 1) describes footwear that has a heel at the rear end of the upper, and a hard protrusion that extends upward and diagonally backward from the top end of the heel. This conventional footwear has a protrusion that guides the heel of the foot into the footwear, allowing it to be put on correctly without using hands or a shoehorn.

[0003] However, for example, people with weak muscles (children, elderly people, etc.) or those with a disease or disability in some part of the legs (e.g., the knees) tend to collapse onto the inside of each foot (arch side) when trying to put on footwear. This is because, while standing, the center of gravity is usually along the centerline of the body. When stepping on the ground to put on shoes, the weight shifts to the center of gravity located along the centerline of the body, making it easier to lean onto the inside of the foot (arch side). As a result, when trying to put on such footwear, there is no way to support the heel of the footwear by adjusting the angle slightly inward, as is the case when using one's hands or a shoehorn, and the foot is likely to crush the arch side of the footwear. Furthermore, similar inconveniences can occur in people other than those with weak muscles, so eliminating the above-mentioned inconveniences would make it possible to create footwear that is easy for everyone to wear. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-139151 Summary of the Invention [Problem to be solved by the invention]

[0005] One of the objects of a specific embodiment of the present disclosure is to provide footwear that overcomes the above-mentioned disadvantages and is easy to wear for anyone. Another object of a specific embodiment of the present disclosure is to provide a crescent-shaped core that is suitable for constructing such footwear. [Means for solving the problem]

[0006] [1] The crescent-shaped core according to one embodiment of the present disclosure is A crescent-shaped core incorporated in a footwear having a sole portion and a main body portion, a rear end portion corresponding to the heel position of a person wearing the footwear; a protruding portion protruding rearward and obliquely upward from above the rear end portion; A first side portion that is positioned on the arch side of the foot of a person wearing the footwear; a second side portion disposed opposite the arch of the foot of the person wearing the footwear; Including, the rear end portion, the first side portion, and the second side portion are arranged in a substantially J-shape as a whole in a plan view, the first side portion is configured to have a length of 30% to 40% of the total length of the main body portion in the front-rear direction in a plan view, the second side portion is configured to have a length of 20% to 25% of the total length of the main body portion in a plan view, The first side portion has an upper end portion configured in a slope shape such that the height between the first side portion and the sole portion gradually decreases as the upper end portion moves from the protrusion toward the front side of the main body portion. It is a moon-shaped core. [2] Footwear according to one embodiment of the present disclosure includes: The sole portion and the main body portion provided on the sole portion to cover the wearer's foot are provided with: The moon-shaped core [1] is built into the main body. It is footwear.

[0007] According to the above configuration, it is possible to provide footwear that is easy to wear for anyone, and also to provide a crescent-shaped core that is suitable for constructing the footwear. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1(A) is a left side view of a footwear according to one embodiment, and FIG. 1(B) is a right side view of the footwear according to one embodiment. [Figure 2] FIG. 2(A) is a plan view of the footwear of one embodiment, and FIG. 2(B) is a rear view of the footwear of one embodiment. [Figure 3] FIG. 3 is a perspective view of the inner part as seen from the right side. [Figure 4] FIG. 4 is a plan view of the inner part as seen from above. [Figure 5] FIG. 5 is a diagram schematically showing the slope shape of the upper end portion of the inner part. [Figure 6] FIG. 6 is a diagram schematically showing the positional relationship between the ankle of the left foot and the inner part. [Figure 7] FIG. 7 is a perspective view of a crescent-shaped core according to one embodiment, seen from the right side. [Figure 8] FIG. 8 is a plan view of the crescent-shaped core of one embodiment as seen from above. [Figure 9] FIG. 9 is a cross-sectional view of the portion from the protruding portion to the rear end portion of the crescent-shaped core. [Figure 10] FIG. 10 is a perspective view showing the configuration of a crescent-shaped core according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, footwear (shoes) according to an embodiment and a crescent-shaped core suitable for use therein will be described with reference to the drawings. Note that the following will describe footwear for the left foot and the crescent-shaped core used therein. Footwear for the right foot, etc., has a structure symmetrical to that of footwear for the left foot, etc., which will be described below, so detailed description will be omitted.

[0010] Fig. 1(A) is a left side view of a footwear according to one embodiment, Fig. 1(B) is a right side view of the footwear according to one embodiment, Fig. 2(A) is a plan view of the footwear according to one embodiment, and Fig. 2(B) is a rear view of the footwear according to one embodiment.

[0011] The footwear of this embodiment shown in the drawings includes a sole portion 11 and a main portion 10 provided thereon. The main portion 10 has a total length L of, for example, about 20 to 30 cm to suit the size of the foot, and is configured to cover the entire foot of the wearer (i.e., the toes, instep, sides of the foot, etc.). The main portion 10 has an opening 10a at the rear end for inserting the foot. The sole portion 11 is provided at the bottom of the main portion 10. The sole portion 11 is a portion for supporting the sole of the foot.

[0012] The main body 10 has a protrusion (main body protrusion) 12 at the top of its rear end. The protrusion 12 protrudes rearward and diagonally upward from the main body 10. This protrusion 12 is designed to allow the heel of the left foot to be inserted smoothly into the footwear without the need for a hand or shoehorn. For this reason, the protrusion 12 and the heel portion 12a of the main body 10 that supports the protrusion 12 have a certain degree of hardness so that they do not lose their shape when the heel of the foot is inserted. The protrusion 12 is a part that comes into contact with the heel of the wearer's foot when putting on the footwear, making it easier for the heel to slide into the footwear.

[0013] The main body 10 includes inner parts 13 arranged from the heel portion 12a to the front of the main body 10 on both sides. The inner parts 13 are formed, for example, using a core material arranged inside the inner fabric that covers the inside of the main body 10 and a flexible cushioning material that covers the core material, and are arranged inside the main body 10. In each drawing, patterns are added to make it easier to see the range within the main body 10 where the inner parts 13 are arranged.

[0014] Fig. 3 is a perspective view of inner part 13 as seen from the right side, and Fig. 4 is a plan view of inner part 13 as seen from above. Inner part 13 is provided inside main body part 10 as an integral part, but here, only the portion corresponding to inner part 13 is shown to make it easier to understand the structure of inner part 13. Inner part 13 includes protruding part 20, inner first side part 21, inner second side part 22, and inner rear end part 23. Inner part 13 is made of a material (soft elastic material) that has a certain degree of flexibility, and can flexibly contract to a certain degree according to the shape of the left foot when the left foot is placed inside the footwear (i.e., when the footwear is worn).

[0015] The protrusion 20 is a part that constitutes the protrusion 12 of the main body 10, and protrudes diagonally upward and rearward from the main body 10. The upper end position of the protrusion 20 is substantially the same as the upper end position of the protrusion 12 (see FIG. 1(A) etc.).

[0016] The inner first side portion 21 is a portion of the main body portion 10 that is placed on the arch side of the left foot. The inner second side portion 22 is a portion of the main body portion 10 that is placed on the opposite side of the arch side of the left foot.

[0017] The inner rear end portion 23 is a portion that is disposed on the rear end side of the main body portion 10. The inner rear end portion 23 is configured to bulge out toward the rear of the main body portion 10 so as to encase the heel of the left foot.

[0018] These inner first side portion 21, inner second side portion 22, and inner rear end portion 23 are integrally formed as shown in the figure, and are configured to form a roughly J-shape as a whole in a plan view (see FIG. 4). The inner first side portion 21 is a portion that comes into contact with the side surface of the arch of the left foot and supports that side. The inner second side portion 22 is a portion that comes into contact with the side surface opposite the arch of the left foot and supports that side. The rear end portion 23 is a portion that comes into contact with the heel of the left foot and supports the heel. As shown in FIGS. 3 and 4 above, the inner first side portion 21, inner second side portion 22, and rear end portion 23 have a certain thickness and are configured to bulge toward the inside of the footwear.

[0019] The length L1 (see FIG. 2(A)) of the inner first side portion 21 is configured to be approximately one-third of the total length L of the main body portion 10. More specifically, the length L1 of the inner first side portion 21 is preferably configured to be 30% to 40% (0.3L≦L1≦0.4L) of the total length L of the main body portion 10. This allows the inner first side portion 21 to support the portion of the foot skeleton from the calcaneus to the metatarsal (first metatarsal), thereby providing more support for the arch side, where the left foot tends to collapse, and thereby making it easier to insert the foot.

[0020] The length L2 (see FIG. 2(A)) of the inner second side portion 22 is configured to be approximately 1 / 4 of the total length L of the main body portion 10. More specifically, the length L2 of the inner second side portion 22 is preferably configured to be 20% to 25% of the total length L of the main body portion 10 (0.2L≦L2≦0.25L). This improves the hold from the heel to the arch side and the opposite side, and allows for smooth insertion of the left foot.

[0021] As shown in FIGS. 1(B) and 3, the upper end portion of the inner first side portion 21 is configured to have a sloped shape in which the height gradually decreases from the protruding portion 20 toward the position where the sole portion 11 is present. In this embodiment, the upper end portion of the inner first side portion 21 is configured to have a first portion 21a, in which the degree of change in distance from the sole portion 11 is relatively small, and a second portion 21b, in which the degree of change in distance from the sole portion 11 is relatively large. FIG. 5(A) is a diagram schematically showing the sloped shapes of the upper end portions of the first portion 21a and the second portion 21b. In the example shown in FIG. 5(A), for ease of understanding, the boundary between the first portion 21a and the second portion 21b and the boundary between the first portion 21a and the protruding portion 20 are indicated by dotted lines.

[0022] The degree of change in distance here refers to the magnitude of the change in distance between the upper end portion and the sole portion 11 per unit distance on the longitudinal axis of the main body portion 10 (the X-axis in FIG. 5(A), etc.), where a small amount of change corresponds to a "small degree of change," and a large amount of change corresponds to a "large degree of change." In the example shown in FIG. 5(A), the curve showing the outline of the upper end portion of the first portion 21a has a gentler slope with respect to the X-axis as it moves leftward in the figure (i.e., forward of the main body portion 10), while the curve showing the outline of the upper end portion of the second portion 21b has a steeper slope with respect to the X-axis as it moves leftward in the figure (i.e., forward of the main body portion 10).

[0023] In this way, by configuring the upper end portion of the inner first side portion 21 so that the height gradually decreases from the protruding portion 10 toward the sole portion 11, it is possible to ensure the function of suppressing deformation of the main body portion 10 by the heel of the left foot when inserting the left foot to put on the footwear, and also to allow the arch of the left foot to smoothly enter the inside of the main body portion 10 without being obstructed much by the inner first side portion 21. Furthermore, as a result of the smooth insertion of the left foot, it is also possible to obtain the effect of being able to further reduce the height of the protruding portion 20.

[0024] In particular, by providing the first portion 21a, in which the degree of change in distance from the sole portion 11 is relatively small, and the second portion 21b, in which the degree of change in distance from the sole portion 11 is relatively large, the first portion 21a can provide more support to the arch side when the left foot begins to be inserted into the main body portion 10, and once the left foot has entered the main body portion 10 to a certain extent, the contact area of ​​the second portion 21b with the arch side is reduced, so that the movement of the left foot into the main body portion 10 is not hindered. This makes the action of inserting the left foot into the main body portion 10, i.e., the action of putting on footwear, smoother. Furthermore, since the height of the protrusion 20 can be reduced accordingly, it becomes possible to increase the degree of freedom in the design of the protrusion above the heel in footwear that does not require the use of hands or a shoehorn.

[0025] Furthermore, by using the first portion 21a and the second portion 21b shown in FIG. 5(A), as shown in the schematic diagram of FIG. 6, it becomes easier to ensure that the first portion 21a and the second portion 21b are large enough to smoothly insert the left foot 30 while preventing discomfort caused by the inner portion 13 contacting the ankle 31 of the left foot 30 when the left foot 30 is inserted into the main body portion 10. As shown by the dotted line in FIG. 6, the height of the upper end portion of the inner portion 13 can be appropriately set depending on the function and design of the footwear. As shown in FIG. 5(B), the slope shape of the upper end portion of the inner first side portion 21 may be curved, such as an arc. In this case, although the slope shape of the upper end portion is an upwardly convex curved shape in the illustrated example, the slope shape of the upper end portion may also be a downwardly convex curved shape. Furthermore, as shown in FIG. 5(C), the upper end portion of the inner first side portion 21 may change into a linear shape. On the other hand, the upper end portion of the inner first side portion 21 may be configured to have three or more portions. That is, the inner first side portion 21 may have any slope shape as long as the height of the upper end portion thereof gradually decreases toward the sole portion 11.

[0026] 1(A) and 3, the inner second side portion 22 has an upper end portion configured in a slope shape in which the height gradually decreases from the protrusion 20 toward the sole portion 11. In this embodiment, the upper end portion of the inner second side portion 22 is configured to have a first portion 22a in which the change in distance from the sole portion 11 is relatively small, and a second portion 22b in which the change in distance from the sole portion 11 is relatively large. In other words, the first portion 22a has a relatively small inclination with respect to the sole portion 11, and the second portion 22b has a relatively large inclination with respect to the sole portion 11.

[0027] In this way, by configuring the upper end portion of the inner second side portion 22 so that its height gradually decreases from the protrusion 20 toward the sole portion 11, it is possible to ensure the function of suppressing deformation of the main body portion 10 caused by the heel of the left foot when inserting the left foot to put on the footwear, and also to allow the portion of the left foot opposite the arch to smoothly enter the inside of the main body portion 10 without being obstructed much by the inner first side portion 21.

[0028] The upper end portion of the inner second side portion 22 does not necessarily have to be configured to have two portions as described above, and the upper end portion of the inner second side portion 22 may change linearly. On the other hand, the upper end portion of the inner second side portion 22 may be configured to have three or more portions. In other words, it is sufficient that the height of the upper end portion of the inner second side portion 22 gradually decreases toward the sole portion 11.

[0029] Next, a crescent-shaped core (core material) suitable for constructing the footwear of the above-described embodiment will be described in detail. Specifically, an embodiment of a crescent-shaped core suitable for constructing the inner part 13 of the footwear of the above-described embodiment will be described. In this specification, the term "crescent-shaped core" refers to a core material that is built into the interior of the main body part 10 of the footwear (the space into which the foot is inserted) between the inner fabric (inner skin) and the outer fabric (outer skin), and is arranged along each of the left and right sides from the heel. Because it is a core material, it does not come into direct contact with the wearer's foot.

[0030] FIG. 7 is a perspective view of a crescent-shaped core of one embodiment, viewed from the right side. FIG. 8 is a plan view of the crescent-shaped core of one embodiment, viewed from above. As shown in each figure, the crescent-shaped core 113 of this embodiment has a shape similar to the inner part 13 described above. As an example, by constructing footwear using this crescent-shaped core 113 as a core material, an inner part 13 that reflects the shape of this crescent-shaped core 113 can be constructed inside the main body part 10.

[0031] In detail, the crescent-shaped core 113 has a protruding portion 120, a first side portion 121, a second side portion 122, and a rear end portion 123. The crescent-shaped core 113 is made of a flexible material (soft elastic material) such as synthetic resin, and can flexibly deform to a certain extent in accordance with the load and shape of the left foot when the left foot is placed inside the footwear (i.e., when the footwear is worn).

[0032] The protruding portion 120 is a portion that constitutes the protruding portion 12 of the main body portion 10 described above, and protrudes rearward and diagonally upward above the rear end portion 123. This protruding portion 120 is also a portion that constitutes the protruding portion 20 of the inner portion 13.

[0033] The first side portion 121 is a portion of the main body portion 10 that is arranged on the arch side of the left foot. The first side portion 121 is a portion that is mainly used to form the inner first side portion 21 of the inner portion 13. The second side portion 122 is a portion that is arranged on the side of the main body portion 10 that is opposite the arch side of the left foot. The second side portion 122 is a portion that is mainly used to form the inner second side portion 22 of the inner portion 13.

[0034] These first side portion 121, second side portion 122, and rear end portion 123 are integrally formed as shown in the figure, and are configured to have a generally J-shape in a plan view as a whole (see FIG. 8), and are configured to have a certain degree of flexibility as a whole. The first side portion 121 is a portion located on the side surface of the arch of the left foot. The second side portion 122 is a portion located on the side surface opposite the arch of the left foot. The rear end portion 123 is a portion located on the heel side of the left foot. As shown in the above-mentioned FIGS. 7 and 8, the first side portion 121, second side portion 122, and rear end portion 123 are made of synthetic resin or the like so as to have a thickness of, for example, about several millimeters.

[0035] The first side portion 121 is configured such that the length L11 (see FIG. 8) determined along the front-rear direction of the main body portion 10 is approximately one-third of the total length L (see FIG. 2(A)) of the main body portion 10. More specifically, the length L1 of the first side portion 121 is preferably configured to be 30% to 40% (0.3L≦L11≦0.4L) of the total length L of the main body portion 10. This allows the inner first side portion 21 of the inner part 13 to be configured to support the part of the foot skeleton from the calcaneus to the metatarsal (first metatarsal), thereby providing more support for the arch side where the left foot tends to fall, and thereby making it easier to insert the foot.

[0036] The second side portion 122 is configured such that the length L21, determined along the front-to-rear direction of the main body portion 10, is approximately ¼ of the total length L (see FIG. 2(A)) of the main body portion 10. More specifically, the length L2 of the second side portion 122 is preferably configured to be 20% to 25% of the total length L of the main body portion 10 (0.2L≦L21≦0.25L). This allows for the configuration of the inner second side portion 22 of the inner part 13, which improves the hold from the heel to the arch side and the opposite side, and allows for smooth insertion of the left foot.

[0037] 7, the upper end portion of the first side portion 121 is configured to have a slope shape in which the height gradually decreases from the protrusion 120 toward the position where the sole portion 11 is present. In this embodiment, the upper end portion of the first side portion 121 is configured to have a first portion 121a in which the degree of change in the distance from the sole portion 11 is relatively small, and a second portion 121b in which the degree of change in the distance from the sole portion 11 is relatively large. The concept of "degree of change in distance" here is the same as that explained above.

[0038] 7 and the like shows a crescent-shaped core 113 corresponding to the sloped shape shown in Fig. 5(A) as a preferred example, but the crescent-shaped core 113 may be configured to correspond to the sloped shapes shown in Fig. 5(B) or 5(C), or the upper end portion of the first side portion 121 may be configured to have three or more sections. In other words, the sloped shape of the first side portion 121 may be any shape as long as the height of its upper end portion gradually decreases toward the sole portion 11.

[0039] 7, the upper end portion of the second side portion 122 is configured to have a slope shape in which the height gradually decreases from the protrusion 120 toward the sole portion 11. In this embodiment, the upper end portion of the second side portion 122 is configured to have a first portion 122a in which the degree of change in the distance from the sole portion 11 is relatively small, and a second portion 122b in which the degree of change in the distance from the sole portion 11 is relatively large. In other words, the first portion 122a has a relatively small inclination with respect to the sole portion 11, and the second portion 122b has a relatively large inclination with respect to the sole portion 11.

[0040] The upper end portion of the second side portion 122 does not necessarily have to be configured to have two portions as described above, and the upper end portion of the second side portion 122 may change linearly. On the other hand, the upper end portion of the second side portion 122 may be configured to have three or more portions. In other words, it is sufficient that the height of the upper end portion of the second side portion 122 gradually decreases toward the sole portion 11.

[0041] Figure 9 is a cross-sectional view of the portion of the crescent-shaped core from protruding portion 120 to rear end portion 123. The cross-section shown in Figure 9 corresponds to the cross-section along line AA shown in Figure 8. The portion from protruding portion 120 to rear end portion 123 has three portions 141, 142, and 143 that are divided based on the vertical direction of the footwear. To distinguish between the portions, hereinafter they will be referred to as upper portion 141, middle portion 142, and lower portion 143, in order from the portion located relatively higher.

[0042] In the illustrated example, upper portion 141, middle portion 142, and lower portion 143 each have a height that is approximately equal to thirds of the height of rear end portion 123 in the vertical direction relative to main body 10, but the division of each portion is not limited to this. In this specification, a certain range including the central position (half the height position) of rear end portion 123 in the height direction is referred to as middle portion 142, the portion above that is referred to as upper portion 141, and the portion below that is referred to as lower portion 143.

[0043] As shown in the figure, the crescent-shaped core 113, including the upper portion 141, middle portion 142, and lower portion 143, is integrally molded using synthetic resin or the like. The upper portion 141 is configured to include a protruding portion 120 that protrudes diagonally upward and rearward relative to the main body portion 10, and a portion that connects this protruding portion 120 to the middle portion 142. The middle portion 142 and the lower portion 143 together form a concave structure. This concave structure is a portion that is convex rearward and concave frontward relative to the main body portion 10, and is the portion of the inner portion 13 that wraps around the wearer's heel.

[0044] In the crescent-shaped core 113 of this embodiment, the thicknesses of the upper portion 141, the middle portion 142, and the lower portion 143 are not necessarily uniform, but rather vary from portion to portion. Specifically, the footwear of this embodiment is intended to be easy to wear for anyone, regardless of muscle strength, as described above. For people with particularly weak muscles, it is desirable that the middle portion 142 and the lower portion 143 of the rear end portion 123 have high rigidity so that they are less likely to deform and more likely to maintain their shape than other portions when the wearer puts on the main body 10. On the other hand, the upper portion 141, which includes the protrusion 120, functions to slide the heel into the main body 10 during the initial movement of the wearer putting on the footwear, so it is preferable that the rigidity be low so that it can deform to a certain extent.

[0045] There are various ways to achieve the above-described rigidity, but when it is assumed that the entire crescent-shaped core 113 is integrally molded from synthetic resin or the like, it is simpler and preferable to set the level of rigidity (strength) by varying the thickness of each portion. Specifically, it is preferable that the thickness t1 of the crescent-shaped core 113 at a predetermined position in the middle portion 142, for example, at the center position in the height direction of the rear end portion 123 (half the height position), is thicker than the thickness of the upper portion 141 and the thickness of the lower portion 143. This makes it possible to relatively increase the rigidity of the middle portion 142 while relatively decreasing the rigidity of the upper portion 141 in particular.

[0046] In this case, the thickness of the crescent-shaped core 113 may vary, as shown in the figure, so that it becomes continuously thinner from the position of thickness t1 of the middle portion 142 toward each of the upper portion 141 and the lower portion 143. Assuming that the crescent-shaped core 113 is molded as a single piece using synthetic resin or the like, varying the thickness in this way makes molding the crescent-shaped core 113 easier.

[0047] More specifically, the thickness t1 of the intermediate portion 142 at a predetermined position is preferably at least 1.5 times (t1≧1.5×t2) the thickness t2 of the upper portion 141 near the tip, and more preferably at least twice (t1≧2×t2). By making the thickness at least twice as large, rigidity can be further increased. Note that "near the tip" refers to a position on the intermediate portion 142 side, for example, about 2 to 5 mm from the tip of the upper portion 141.

[0048] The thickness of the lower portion 143 may be approximately the same as the thickness of the middle portion 142. This can increase the overall rigidity of the lower portion 143 and the middle portion 142, thereby suppressing deformation (flexion) of the heel portion 12a when the wearer inserts their heel into the main body portion 10, making it easier for even those with weak muscles to insert their heel.

[0049] On the other hand, thickness t1 at a predetermined position of middle portion 142 may be 1.5 times or more (t1≧1.5×t3) or twice or more (t1≧2×t3) the thickness t3 near the tip of lower portion 143. Note that "near the tip" refers to, for example, a position about 2 to 5 mm toward middle portion 142 from the tip of lower portion 143. When the thickness near the tip of lower portion 143 is made relatively thin in this way, it is possible to obtain the effect of reducing discomfort when lower portion 143 hits the heel of the wearer via the inner fabric.

[0050] Furthermore, although not shown, it is preferable that thickness t1 at a predetermined position of intermediate portion 142 be thicker than the thicknesses of first side portion 121 and second side portion 122. More specifically, thickness t1 at a predetermined position of intermediate portion 142 is preferably at least 1.5 times, and more preferably at least twice, the thickness of each of first side portion 121 and second side portion 122. In this case, it is not necessarily assumed that the thickness of each of first side portion 121 and second side portion 122 is uniform regardless of position. It is sufficient that thickness t1 at a predetermined position of intermediate portion 142 is thicker than the thickness at any position of each of first side portion 121 and second side portion 122.

[0051] FIG. 10 is a perspective view showing the configuration of a crescent-shaped core 113 of another embodiment. Similar to FIG. 7, this is a perspective view of the crescent-shaped core as seen from the right side. The crescent-shaped core 113a shown in FIG. 10 has a configuration essentially similar to that of the crescent-shaped core 113 of the embodiment described above. Therefore, common components are designated by common reference numerals, and detailed descriptions of these components will be omitted. As shown in FIG. 10, the crescent-shaped core 113a may be configured such that the upper edge of the first portion 121a of the first side portion 121 widens toward the inside of the main body portion 10 (see FIG. 4). In the figure, the shape of the upper edge of the crescent-shaped core 113 of the embodiment shown in FIG. 7 is indicated by a dotted line for comparison. While the upper edge of the crescent-shaped core 113 shown in FIG. 7 is generally directed upward, the upper edge of the crescent-shaped core 113a shown in FIG. 10 widens continuously, bending inward, i.e., away from the main body portion 10. This allows the wearer to insert their foot more smoothly into the main body portion 10.

[0052] According to the above-described embodiment, it is possible to provide footwear that is easy to wear for anyone, and also to provide a crescent-shaped core that is suitable for constructing the footwear.

[0053] The present disclosure is not limited to the above-described embodiment, and various modifications can be made within the scope of the present disclosure. For example, the above-described embodiment illustrates footwear having a main body 10 that does not use laces, but the scope of application of the present disclosure is not limited thereto and can be applied to footwear having a main body that uses laces (so-called lace-up shoes) and various other types of footwear having main bodies. Furthermore, in the above-described embodiment, the inner part 13 includes the inner first side part 21 and the inner second side part 22. However, the inner second side part 22 may be omitted, and the inner part 13 may include the inner first side part 21 and the inner rear end part 23.

[0054] Furthermore, in the above embodiment, the thickness was changed to vary the rigidity depending on the position of the crescent-shaped core 113, but differences in rigidity can also be achieved by using different materials for each part, or by providing reinforcing material in parts where it is desired to have relatively higher rigidity, or there are no limitations on the means as long as it is possible to vary the rigidity. [Explanation of symbols]

[0055] 10: Main body 11: Sole 12:Protrusion 13: Inner part 20:Protrusion 21: Inner first side 21a: Part 1 21b:Second part 22: Inner second side 22a: Part 1 22b:Second part 23: Rear end 113, 113a: Moon-shaped core 121: First side 121a: Part 1 121b:Second part 122: Second side 122a: Part 1 122b:Second part 123: Rear end 141: Upper part 142: Middle part 143: Lower part

Claims

1. A crescent-shaped core incorporated in a footwear having a sole portion and a main body portion, a rear end portion corresponding to the heel position of a person wearing the footwear; a protruding portion protruding rearward and obliquely upward from above the rear end portion; a first side portion disposed on the arch side of the foot of a person wearing the footwear; a second side portion disposed opposite the arch of the foot of the wearer of the footwear; Including, the rear end portion, the first side portion, and the second side portion are arranged in a substantially J-shape as a whole in a plan view, the first side portion is configured to have a length of 30% to 40% of the total length of the main body portion in the front-rear direction in a plan view, the second side portion has a length of 20% to 25% of the total length of the main body portion in a plan view, The first side portion is configured to have a slope shape such that the height between the first side portion and the sole portion gradually decreases as the upper end portion thereof moves from the protrusion toward the front side of the main body portion. Moon-shaped core.

2. The second side portion is configured to have a slope shape such that the height between the second side portion and the sole portion gradually decreases as the upper end portion thereof moves from the protrusion toward the front side of the main body portion. The lunar core according to claim 1.

3. the rear end portion is continuously formed having an upper portion, a middle portion, and a lower portion; The thickness of the intermediate portion at a predetermined position is greater than the thickness of the upper portion and / or the lower portion. The lunar core according to claim 1.

4. The rigidity of the middle portion at a predetermined position is higher than the rigidity of the upper portion. The lunar core according to claim 3.

5. The thickness of the middle portion at a predetermined position is 1.5 times or more the thickness of the upper portion near the tip. The lunar core according to claim 3.

6. The thickness of the intermediate portion at a predetermined position is greater than the thickness of the first side portion and / or the second side portion. The lunar core according to claim 3.

7. The first side portion has a shape configured such that an upper edge thereof widens inward relative to the main body portion. The lunar core according to claim 1.

8. The sole portion and the main body portion provided on the sole portion to cover the wearer's foot are provided. The crescent-shaped core according to claim 1 is built into the main body. footwear.

9. The main body portion is a heel portion covering the heel of the wearer's foot; a main body protrusion that protrudes from the heel portion toward the rear and diagonally upward of the main body, and that comes into contact with the heel of the wearer's foot when putting on the footwear, thereby making it easier for the heel to slide into the footwear; an inner part provided inside the main body part, having at least a portion extending from the heel part to the arch side of the wearer's foot and configured in a substantially J-shape in a plan view; It has The inner part is an inner first side portion that is disposed inside the main body portion on the arch side of the wearer's foot and that contacts the arch of the wearer's foot when worn; an inner second side portion that is disposed inside the main body portion on the opposite side of the arch of the wearer's foot in the left-right direction and that contacts the opposite side of the arch of the wearer's foot when worn; an inner rear end portion that is disposed inside the main body portion on the heel side of the wearer's foot and that contacts the heel of the wearer's foot when worn, and that is connected to each of the inner first side portion and the inner second side portion; It has the inner first side portion is configured to have a length of 30% to 40% of the total length of the main body portion in the front-rear direction in a plan view, the inner second side portion is configured to have a length of 20% to 25% of the total length of the main body portion in a plan view, The inner first side portion is configured to have a slope shape such that the height between the upper end portion and the sole portion gradually decreases as the upper end portion moves from the protrusion toward the front side of the main body portion. Footwear according to claim 8.

10. The inner second side portion is configured to have a slope shape such that the height between the upper end portion and the sole portion gradually decreases as the upper end portion moves from the protrusion toward the front side of the main body portion. Footwear according to claim 9.

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