Crescent-shaped core, footwear
Patent Information
- Application Number
- JP2025146116
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-09-03
- Publication Date
- 2026-09-07
Smart Images
Figure 2026142507000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to footwear (particularly short boots) and to a counterpuff used in footwear.
Background Art
[0002] Japanese Unexamined Patent Publication No. 2022-139151 (Patent Document 1) describes footwear having a heel portion at the rear end of an upper, wherein a hard protruding piece extending obliquely upward and rearward is formed at the upper end of the heel portion. In this conventional footwear, the protruding piece guides the heel of a foot into the footwear, so that the footwear can be put on correctly without using a hand or a shoehorn.
[0003] By the way, for example, in a person with weak muscle strength (such as a child, an elderly person, etc.) or a person having a disease or disorder in any part of a leg (such as a knee, etc.), when the person tries to put on the footwear, the foot is prone to falling toward the medial side (the arch side) of each foot. This is because when a person is normally standing, the center line of the body serves as the center of gravity, and when the person performs an action such as stepping on the ground to put on shoes, the body weight shifts toward the center of gravity located on the center line of the body, which makes the foot prone to tilting toward the medial side (the arch side) of the foot. For this reason, when trying to put on the footwear as described above, since there is no accompanying action of delicately adjusting the angle of the heel part of the footwear inward to support it as when using a hand or a shoehorn, a situation where the arch side of the footwear is crushed by the foot is prone to occur. Moreover, since the same inconvenience can occur even in a person who does not have weak muscle strength, it is considered that if the above-described inconvenience is eliminated, footwear that is easy to put on for anyone can be realized.
Prior Art Literature
Patent Literature
[0004]
Patent Document 1
Summary of the Invention
Problem to be Solved by the Invention
[0005] One of the purposes of the specific embodiments of this disclosure is to eliminate the above-mentioned inconveniences and provide footwear that is easy for anyone to wear. Another purpose of the specific embodiments of this disclosure is to provide a crescent-shaped core suitable for constructing said footwear. [Means for solving the problem]
[0006] [1] A crescent-shaped lead in one aspect relating to this disclosure is In footwear comprising a sole and a main body, a crescent-shaped core is embedded in the main body, The rear end of the footwear corresponds to the position of the heel of the person wearing the footwear, A protruding portion that extends from above the aforementioned rear end toward the rear and diagonally upward, The first side portion is positioned on the arch side of the foot of the person wearing the footwear, The second side portion is positioned on the side opposite to the arch of the foot of the person wearing the footwear, Includes, The rear end, the first side portion, and the second side portion are arranged in a substantially J-shape when viewed from above. The first side portion is configured to have a length of 30% to 40% of the total length of the main body in the front-rear direction when viewed from above. 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 is configured in a slope shape such that the height between it and the sole portion gradually decreases as its upper end portion moves from the protruding portion toward the front of the main body portion. It has a crescent-shaped lead. [2] Footwear in one aspect relating to the present disclosure is It comprises a sole portion and a main body portion that is provided on the sole portion and covers the wearer's foot, The crescent-shaped lead [1] is housed in the main body. It is footwear.
[0007] According to the above configuration, it is possible to provide footwear that is easy for anyone to wear. Furthermore, it is possible to provide a crescent-shaped core suitable for constructing such footwear. [Brief explanation of the drawing]
[0008] [Figure 1] Figure 1(A) is a left side view of footwear according to one embodiment, and Figure 1(B) is a right side view of footwear according to one embodiment. [Figure 2] Figure 2(A) is a top view of footwear according to one embodiment, and Figure 2(B) is a rear view of footwear according to one embodiment. [Figure 3] Figure 3 is a perspective view of the inner section from the right side. [Figure 4] Figure 4 is a plan view of the inner section as seen from above. [Figure 5] Figure 5 schematically shows the slope shape of the upper end portion of the inner section. [Figure 6] Figure 6 schematically shows the positional relationship between the left ankle and the inner part of the shoe. [Figure 7] Figure 7 is a perspective view of a crescent-shaped core of one embodiment, seen from the right side. [Figure 8] Figure 8 is a plan view of a crescent-shaped core of one embodiment, viewed from above. [Figure 9] Figure 9 is a cross-sectional view of the portion of the crescent-shaped core from the protruding part to the rear end. [Figure 10] Figure 10 is a perspective view showing the configuration of a crescent-shaped core in another embodiment. [Modes for carrying out the invention]
[0009] The following describes the footwear (shoes) of the embodiment and the crescent-shaped core suitable for use therein, with reference to the drawings. The following description focuses on footwear for the left foot and the crescent-shaped core used therein. Detailed descriptions of footwear for the right foot, etc., are omitted because they have a symmetrical structure to the left footwear, etc., described below.
[0010] Figure 1(A) is a left side view of footwear according to one embodiment, and Figure 1(B) is a right side view of footwear according to one embodiment. Figure 2(A) is a top view of footwear according to one embodiment, and Figure 2(B) is a rear view of footwear according to one embodiment.
[0011] The footwear of the present embodiment shown in each drawing is configured to include a sole portion 11 and a main body portion 10 provided thereon. The main body portion 10 has a total length L of, for example, about 20 to 30 cm according to the size of the foot, and is configured to cover the entire foot of the wearer (i.e., the toe, instep, side of the foot, etc.). The main body portion 10 has an opening 10a on the rear end side for inserting a foot. The sole portion 11 is provided at a lower portion of the main body portion 10. The sole portion 11 is a portion for supporting the sole of the foot.
[0012] The main body portion 10 has a protruding portion (main body protruding portion) 12 on an upper portion of a rear end side thereof. The protruding portion 12 protrudes rearward of the main body portion 10 and in an obliquely upward direction. The protruding portion 12 is a portion that allows the heel to smoothly enter the footwear without using a hand or a shoehorn when inserting the left foot into the footwear. For this reason, the protruding portion 12 and the heel portion 12a, which is a portion of the main body portion 10 that supports the protruding portion 12, have a certain degree of hardness so that the shape does not collapse much even when the heel of the foot is inserted. The protruding portion 12 is a portion that comes into contact with the heel of the wearer's foot during a wearing operation and functions to make it easier for the heel to slide into the footwear.
[0013] The main body portion 10 includes inner portions 13 arranged so as to extend from the heel portion 12a to the front of the main body portion 10 on the left and right respectively. The inner portion 13 is configured using, for example, a core material disposed inside an inner fabric covering the inner side of the main body portion 10 and a flexible cushion material provided covering the core material, and is provided inside the main body portion 10. In each drawing, a pattern is added to make it easy to understand the range where the inner portion 13 is provided inside the main body portion 10.
[0014] FIG. 3 is a perspective view of the inner portion 13 as viewed from the right side, and FIG. 4 is a plan view of the inner portion 13 as viewed from the upper side. The inner portion 13 is provided integrally with and inside the main body portion 10, but for ease of understanding the structure of the inner portion 13, only the portion corresponding to the inner portion 13 is extracted and shown herein. The inner portion 13 includes a protruding portion 20, a first inner side portion 21, a second inner side portion 22, and an inner rear end portion 23. The inner portion 13 is formed of a material having a certain degree of flexibility (a soft elastic material), and can contract flexibly to a certain extent according to the shape of the left foot when the left foot is put into the footwear (i.e., when the footwear is worn).
[0015] The protruding portion 20 is a portion that constitutes the protruding portion 12 of the aforementioned main body portion 10, and protrudes rearward and obliquely upward from the main body portion 10. The upper end position of the protruding portion 20 is substantially equal to the upper end position of the protruding portion 12 (see FIG. 1(A) and the like).
[0016] The first inner side portion 21 is a portion disposed at a section of the main body portion 10 that corresponds to the arch side of the left foot. The second inner side portion 22 is a portion disposed at a section of the main body portion 10 that is opposite to the arch side of the left foot.
[0017] The inner rear end portion 23 is a portion disposed on the rear end side of the main body portion 10. The inner rear end portion 23 is configured to bulge toward the rear of the main body portion 10 so as to wrap around 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 constructed as shown in the figure, and are configured to be roughly J-shaped in plan view (see Figure 4). The inner first side portion 21 is the part that contacts and supports the side of the arch of the left foot. The inner second side portion 22 is the part that contacts and supports the side of the left foot opposite to the arch of the foot. The rear end portion 23 is the part that contacts and supports the heel of the left foot. As shown in Figures 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 inward towards the inside of the footwear.
[0019] The inner first side portion 21 has a length L1 (see Figure 2(A)) that is approximately 1 / 3 the total length L of the main body portion 10. More specifically, it is preferable that the length L1 of the inner first side portion 21 be 30% to 40% of the total length L of the main body portion 10 (0.3L ≤ L1 ≤ 0.4L). This allows the inner first side portion 21 to support the portion of the foot's skeleton from the calcaneus to the metatarsal bone (first metatarsal bone), thus providing more support to the arch side of the left foot, which is prone to collapsing, and thereby allowing for smoother insertion of the foot.
[0020] The inner second side portion 22 has a length L2 (see Figure 2(A)) that is approximately 1 / 4 the total length L of the main body portion 10. More specifically, it is preferable that the length L2 of the inner second side portion 22 be 20% to 25% of the total length L of the main body portion 10 (0.2L ≤ L2 ≤ 0.25L). This enhances the hold from the heel to the arch and the opposite side, and allows for smooth insertion of the left foot.
[0021] As shown in Figures 1(B) and 3, the inner first side portion 21 is configured with a slope shape at its upper end, where the height gradually decreases from the protruding portion 20 towards the position where the sole portion 11 is located. In this embodiment, the upper end portion of the inner first side portion 21 is configured to have a first portion 21a where the degree of change in distance from the sole portion 11 is relatively small, and a second portion 21b where the degree of change in distance from the sole portion 11 is relatively large. Figure 5(A) is a schematic diagram showing the slope shapes of the upper ends of the first portion 21a and the second portion 21b. In the example shown in Figure 5(A), 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 for ease of understanding.
[0022] The degree of change in distance referred to here is the magnitude of the change in distance between the upper end portion and the sole portion 11 per unit distance along the front-to-back axis of the main body portion 10 (the X-axis in Figure 5(A), etc.) (the change in length along the Y-axis in Figure 5(A), etc.). A small change corresponds to a "small degree of change," and a large change corresponds to a "large degree of change." In the example shown in Figure 5(A), the curve showing the contour of the upper end portion of the first part 21a has a gentler slope with respect to the X-axis as it moves to the left in the figure (i.e., towards the front of the main body portion 10), while the curve showing the contour of the upper end portion of the second part 21b has a steeper slope with respect to the X-axis as it moves to the left in the figure (i.e., towards the front of the main body portion 10).
[0023] In this way, by configuring the upper end portion of the inner first side portion 21 to gradually decrease in height from the protruding portion 10 towards the sole portion 11, it is possible to ensure that deformation of the main body portion 10 by the heel of the left foot is suppressed when inserting the left foot to put on the footwear, and the arch of the left foot can smoothly enter the main body portion 10 without being significantly obstructed by the inner first side portion 21. Furthermore, as a result of smoother insertion of the left foot, it is also possible to further reduce the height of the protruding portion 20.
[0024] In particular, by providing a first part 21a, which has a relatively small degree of change in distance from the sole part 11, and a second part 21b, which has a relatively large degree of change in distance from the sole part 11, it becomes possible to provide more support to the arch side by the first part 21a when inserting the left foot into the main body 10, and after the left foot has entered the main body 10 to some extent, the contact area with the arch side by the second part 21b decreases, so as not to hinder the movement of the left foot into the main body 10. Therefore, the action of inserting the left foot into the main body 10, that is, the action of putting on footwear, becomes smoother. In addition, the height of the protrusion 20 can be made lower, which increases the design freedom regarding the protrusion above the heel of footwear that does not require the use of hands or a shoehorn.
[0025] Furthermore, by using the first part 21a and the second part 21b shown in Figure 5(A), as schematically shown in Figure 6, it becomes easier to ensure that the respective sizes of the first part 21a and the second part 21b are sufficient to allow for smooth insertion of the left foot, while preventing discomfort caused by the inner part 13 hitting the ankle 31 of the left foot 30 when the left foot 30 is inserted into the main body 10. As illustrated by the dotted line in Figure 6, the height of the upper end portion of the inner part 13 can be appropriately set according to the function and design of the footwear. Note that, as illustrated in Figure 5(B), the slope shape of the upper end portion of the inner first side portion 21 may be a curved shape 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 be a downwardly convex curved shape. Also, as illustrated in Figure 5(C), the upper end portion of the inner first side portion 21 may change to a straight line. On the other hand, the upper end portion of the inner first side portion 21 may be configured to have three or more parts. In other words, the inner first side portion 21 can have any slope shape as long as its upper end portion gradually decreases in height towards the sole portion 11.
[0026] As shown in Figures 1(A) and 3, the inner second side portion 22 is configured in a slope shape at its upper end, where the height gradually decreases from the protruding portion 20 towards 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 where the change in distance from the sole portion 11 is relatively small, and a second portion 22b where 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 to gradually decrease in height from the protruding portion 20 towards the sole portion 11, it is possible to ensure that deformation of the main body portion 10 by the heel of the left foot is suppressed when inserting the left foot to put on the footwear, and the part of the left foot opposite the arch can smoothly enter the main body portion 10 without being greatly obstructed by the inner first side portion 21.
[0028] Furthermore, the upper end portion of the inner second side portion 22 does not necessarily have to be configured to have the two parts described above, and the upper end portion of the inner second side portion 22 may change in a straight line. On the other hand, the upper end portion of the inner second side portion 22 may be configured to have three or more parts. That is, the upper end portion of the inner second side portion 22 should gradually decrease in height towards the sole portion 11.
[0029] Next, a suitable crescent-shaped core (core material) 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, "crescent-shaped core" refers to a core material that is embedded inside the main body 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 positioned along the left and right sides from the heel. As it is a core material, it does not come into direct contact with the wearer's foot.
[0030] Figure 7 is a perspective view of the crescent-shaped core of one embodiment, viewed from the right side. Figure 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. For example, by using this crescent-shaped core 113 as a core material to construct footwear, an inner part 13 that reflects the shape of this crescent-shaped core 113 can be constructed inside the main body 10.
[0031] In detail, the crescent-shaped core 113 comprises 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 deform to a certain extent flexibly according to the load on the left foot and the 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 part that constitutes the protruding portion 12 of the main body portion 10 described above, and protrudes rearward and diagonally upward from above the rear end portion 123. This protruding portion 120 is also a part that constitutes the protruding portion 20 of the inner portion 13.
[0033] The first side portion 121 is the portion of the main body 10 that is located on the arch side of the left foot. The first side portion 121 mainly constitutes the inner first side portion 21 of the inner portion 13. The second side portion 122 is the portion of the main body 10 that is located on the side opposite to the arch side of the left foot. The second side portion 122 mainly constitutes the inner second side portion 22 of the inner portion 13.
[0034] The first side portion 121, the second side portion 122, and the rear end portion 123 are integrally constructed as shown in the figure, and the overall structure is roughly J-shaped in plan view (see Figure 8), and is configured to have a certain degree of flexibility as a whole. The first side portion 121 is the part located on the arch side of the left foot. The second side portion 122 is the part located on the side opposite to the arch side of the left foot. The rear end portion 123 is the part located on the heel side of the left foot. As shown in Figures 7 and 8 above, the first side portion 121, the second side portion 122, and the rear end portion 123 are constructed using synthetic resin or the like, for example, with a thickness of several millimeters.
[0035] The first side portion 121 is configured such that its length L11 (see Figure 8), determined along the front-to-back direction of the main body portion 10, is approximately 1 / 3 of the total length L of the main body portion 10 (see Figure 2(A)). More specifically, it is preferable that the length L1 of the first side portion 121 be 30% to 40% of the total length L of the main body portion 10 (0.3L ≤ L11 ≤ 0.4L). This allows for the configuration of the inner first side portion 21 of the inner portion 13, which can support the part of the foot skeleton from the calcaneus to the metatarsal bone (first metatarsal bone), thereby providing more support to the arch side of the foot, which is prone to collapsing, and thus allowing for smoother insertion of the foot.
[0036] The second side portion 122 is configured such that its length L21, determined along the front-to-back direction of the main body portion 10, is approximately 1 / 4 of the total length L of the main body portion 10 (see Figure 2(A)). More specifically, it is preferable that the length L2 of the second side portion 122 be 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 portion 13, which enhances the hold from the heel to the arch and the opposite side, and enables smooth insertion of the left foot.
[0037] As shown in Figure 7, the first side portion 121 is configured in a slope shape at its upper end, where the height gradually decreases from the protruding portion 120 towards the position where the sole portion 11 is located. In this embodiment, the upper end portion of the first side portion 121 is configured to have a first portion 121a where the degree of change in distance from the sole portion 11 is relatively small, and a second portion 121b where the degree of change in distance from the sole portion 11 is relatively large. The concept of "degree of change in distance" here is the same as described above.
[0038] In Figure 7, etc., a crescent-shaped core 113 corresponding to the slope shape shown in Figure 5(A) is shown as a preferred example. However, the crescent-shaped core 113 may be configured to correspond to the slope shapes shown in Figure 5(B) and Figure 5(C), or the upper end portion of the first side portion 121 may be configured to have three or more parts. In other words, the slope shape of the first side portion 121 can be any shape as long as its upper end portion gradually decreases in height toward the sole portion 11.
[0039] As shown in Figure 7, the second side portion 122 is configured in a slope shape at its upper end, where the height gradually decreases from the protruding portion 120 towards 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, where the degree of change in distance from the sole portion 11 is relatively small, and a second portion 122b, where the degree of change in 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] Furthermore, the upper end portion of the second side portion 122 does not necessarily have to be configured to have the two parts described above; the upper end portion of the second side portion 122 may change in a straight line. On the other hand, the upper end portion of the second side portion 122 may be configured to have three or more parts. That is, the upper end portion of the second side portion 122 should gradually decrease in height towards the sole portion 11.
[0041] Figure 9 is a cross-sectional view of the portion of the crescent-shaped core from the protruding portion 120 to the rear end portion 123. The cross-section shown in Figure 9 corresponds to the cross-section in the direction of line AA shown in Figure 8. The portion from the protruding portion 120 to the rear end portion 123 has three parts 141, 142, and 143, which are divided based on the vertical direction of the footwear. To distinguish each part, below they will be referred to as the upper part 141, the middle part 142, and the lower part 143, in order from the part that is relatively higher.
[0042] In the illustrated example, the upper portion 141, the middle portion 142, and the lower portion 143 each have heights that are approximately three equal parts of the height of the rear end portion 123 in the vertical direction relative to the main body portion 10, but the division of each portion is not limited to this. In this specification, a certain range including the central position (the position half the height) in the height direction of the rear end portion 123 is defined as the middle portion 142, the portion above that is defined as the upper portion 142, and the portion below is defined as the lower portion 143.
[0043] As shown in the figure, the crescent-shaped core 113, including the upper part 141, the middle part 142, and the lower part 143, is integrally molded using synthetic resin or the like. The upper part 141 consists of a protruding part 120 that extends diagonally upward from the rear of the main body part 10, and a part that connects this protruding part 120 to the middle part 142. The middle part 142 and the lower part 143 together form a concave structure. This concave structure is a part that is convex at the rear and concave at the front, relative to the main body part 10, and is a part that forms the part of the inner part 13 that wraps around the wearer's heel.
[0044] In the crescent-shaped core 113 of this embodiment, the thickness of the upper portion 141, the middle portion 142, and the lower portion 143 is not necessarily uniform, and the thickness differs depending on the part. Specifically, as described above, the footwear of this embodiment aims to provide footwear that is easy for anyone to wear regardless of muscle strength. In particular, for people with 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 maintain their shape compared to other parts when inserting the heel into the main body portion 10. On the other hand, the upper portion 141, which includes the protruding portion 120, is a part that performs the function of sliding the heel into the main body portion 10 in the initial movement of the wearer putting on the footwear, so it is preferable to have low rigidity so that it is somewhat easily deformed.
[0045] While various methods can be considered to achieve the rigidity described above, assuming that the entire crescent-shaped core 113 is integrally molded with synthetic resin or the like, it is preferable and simpler to set the level of rigidity (strength) by varying the thickness of each part. Specifically, it is preferable that the thickness t1 at a predetermined position in the intermediate part 142 of the crescent-shaped core 113, for example, at the central position in the height direction of the rear end 123 (at the 1 / 2 height position), is thicker than the thickness of the upper part 141 and the lower part 143. This makes it possible to relatively increase the rigidity of the intermediate part 142 while relatively decreasing the rigidity of the upper part 141 in particular.
[0046] Furthermore, in this case, the thickness of the crescent-shaped core 113 may change so that it continuously decreases from the position of thickness t1 of the intermediate portion 142 toward the upper portion 141 and the lower portion 143, as shown in the figure. Assuming that the crescent-shaped core 113 is integrally molded using synthetic resin or the like, such a change in thickness makes it easier to mold the crescent-shaped core 113.
[0047] More specifically, the thickness t1 of the intermediate portion 142 at a predetermined position is preferably 1.5 times or more than the thickness t2 of the upper portion 141 near the tip (t1 ≥ 1.5 × t2), and more preferably twice or more (t1 ≥ 2 × t2). By making the thickness twice or more, the rigidity can be further increased. The vicinity of the tip refers, for example, to a position about 2 to 5 mm from the tip of the upper portion 141 towards the intermediate portion 142.
[0048] The thickness of the lower portion 143 may be approximately the same as the thickness of the middle portion 142. This increases the overall rigidity of the lower portion 143 and the middle portion 142, thereby suppressing deformation (bending) of the heel portion 12a when the wearer inserts their heel into the main body portion 10, making it easier for people with weak muscles to insert their heels.
[0049] On the other hand, the thickness t1 of the intermediate portion 142 at a predetermined position may be 1.5 times or more (t1 ≥ 1.5 × t3) or 2 times or more (t1 ≥ 2 × t3) the thickness t3 near the tip of the lower portion 143. The vicinity of the tip refers, for example, to a position about 2 to 5 mm from the tip of the lower portion 143 towards the intermediate portion 142. By making the thickness near the tip of the lower portion 143 relatively thinner in this way, the effect of reducing discomfort when the lower portion 143 comes into contact with the wearer's heel through the inner fabric can be obtained.
[0050] Furthermore, although not shown in the figures, it is preferable that the thickness t1 of the intermediate portion 142 at a predetermined position is greater than the thickness of the first side portion 121 and the second side portion 122, respectively. More specifically, it is preferable that the thickness t1 of the intermediate portion 142 at a predetermined position is 1.5 times or more than the thickness of the first side portion 121 and the second side portion 122, and more preferably twice or more. In this case, it is not necessarily assumed that the thickness of the first side portion 121 and the second side portion 122 is uniform regardless of position. It is sufficient that the thickness t1 of the intermediate portion 142 at a predetermined position is greater than the thickness of the first side portion 121 and the second side portion 122 at any position.
[0051] Figure 10 is a perspective view showing the configuration of the crescent-shaped core 113 of another embodiment. Similar to Figure 7 described above, a perspective view of the crescent-shaped core from the right side is shown. The crescent-shaped core 113a shown in Figure 10 has basically the same configuration as the crescent-shaped core 113 of the embodiment described above. For this reason, common reference numerals are used for common components, and detailed explanations of these components are omitted. As shown in Figure 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 inward (see Figure 4) relative to the main body portion 10. In the figure, the shape of the upper edge of the crescent-shaped core 113 of the embodiment shown in Figure 7 is shown by a dotted line for comparison. In the crescent-shaped core 113 shown in Figure 7, the upper edge was almost upward, but in the crescent-shaped core 113a shown in Figure 10, the upper edge widens continuously by curving inward, that is, away from the main body portion 10. This has the effect of making the movement of the wearer when putting their foot into the main body portion 10 smoother.
[0052] According to the embodiments described above, it is possible to provide footwear that is easy for anyone to wear. Furthermore, it is possible to provide a crescent-shaped core suitable for constructing such footwear.
[0053] This disclosure is not limited to the embodiments described above, and can be modified and implemented in various ways within the scope of the gist of this disclosure. For example, the above embodiments exemplified a footwear having a main body 10 that does not use laces, but the scope of application of this disclosure is not limited to this, 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 a main body. Also, in the above embodiments, the inner part 13 had an inner first side part 21 and an inner second side part 22, but the inner second side part 22 may be omitted, and the inner part may consist of an inner first side part 21 and an inner rear end part 23.
[0054] Furthermore, in the embodiment described above, the thickness was varied to make the rigidity different at each position of the crescent-shaped core 113, but differences in rigidity can also be obtained by using different materials for each part, or by providing reinforcing material to the part where relatively higher rigidity is desired, or any other means are not limited as long as it is possible to make the rigidity different. [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. In footwear comprising a sole and a main body, a crescent-shaped core is embedded in the main body, The rear end of the footwear corresponds to the position of the heel of the person wearing the footwear, A protruding portion that projects rearward and diagonally upward from above the aforementioned rear end, The first side portion is positioned on the arch side of the foot of the person wearing the footwear, A second side portion is positioned on the side opposite to the arch of the foot of the person wearing the footwear, Includes, The rear end, the first side portion, and the second side portion are arranged in a substantially J-shape when viewed from above. The first side portion is configured to have a length of 30% to 40% of the total length of the main body in the front-rear direction when viewed from above. 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 is configured in a slope shape such that the height between it and the sole portion gradually decreases as its upper end portion moves from the protruding portion toward the front of the main body portion. Crescent-shaped lead.
2. The second side portion is configured in a slope shape such that the height between it and the sole portion gradually decreases as its upper end portion moves from the protruding portion toward the front of the main body portion. The crescent-shaped lead according to claim 1.
3. The aforementioned rear end is continuously molded having an upper portion, an intermediate 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 crescent-shaped lead according to claim 1.
4. The rigidity at a predetermined position in the intermediate portion is higher than the rigidity of the upper portion. The crescent-shaped lead according to claim 3.
5. The thickness of the intermediate portion at a predetermined position is 1.5 times or more the thickness of the upper portion near the tip. The crescent-shaped lead 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 crescent-shaped lead according to claim 3.
7. The first side portion has a shape such that its upper edge widens inward relative to the main body portion. The crescent-shaped lead according to claim 1.
8. It comprises a sole portion and a main body portion that is provided on the sole portion and covers the wearer's foot, The crescent-shaped lead described in claim 1 is incorporated into the main body. footwear.
9. The main body is, The heel portion covers the heel of the wearer's foot, This part is configured to protrude from the heel portion toward the rear and diagonally upward of the main body, and serves the function of making contact with the heel of the wearer's foot during the wearing motion, thereby facilitating the heel to slide into the inside of the footwear. An inner part provided inside the main body, having at least a portion extending from the heel portion towards the arch of the wearer's foot, and configured in a roughly J-shape in plan view, It has, The aforementioned inner part is The first inner side portion is positioned inside the main body on the arch side of the wearer's foot and is the part that comes into contact with the arch of the wearer's foot when worn, The inner second side portion is located inside the main body and is positioned on the side opposite to the arch of the wearer's foot in the left-right direction, and is the part that comes into contact with the side opposite to the arch of the wearer's foot when worn. The inner rear end portion is located inside the main body at the heel side of the wearer's foot and is in contact with the heel of the wearer's foot when worn, and is connected to the first inner side portion and the second inner 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 in the front-rear direction when viewed from above. 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 in a slope shape such that the height between it and the sole portion gradually decreases as its upper end portion moves from the protruding portion toward the front of the main body portion. footwear.
10. The inner second side portion is configured in a slope shape such that the height between it and the sole portion gradually decreases as its upper end portion moves from the protruding portion toward the front of the main body portion. Footwear according to claim 9.