slippers

Abstract

To provide slippers that fit the unevenness of the sole of the foot, are hard to slip off, support rolling during walking, and improve walking posture. [Solution] The sole part 2 supports the sole of the foot and has a protuberance 21 on the surface that the sole comes into contact with, in the area corresponding to the arch of the foot, and a depression 22 on the area that the heel comes into contact with, and an upper part 1 that forms an arch-shaped space that covers the instep, provided in front of the sole part, and the sole part is provided with a core material made of a hard material with unevenness on the surface that matches the unevenness of the sole of the foot.

Description

[Technical Field]

[0001] This invention relates to slippers that fit the shape of the sole of the foot, envelop the entire foot, and are comfortable to wear, and also have the effect of correcting posture when walking. [Background technology]

[0002] Slippers are footwear consisting of an upper part that covers the instep and a sole part on which the foot rests. They are easy to put on as the instep is inserted into the upper part and the heel and ankle are not secured. Although they are easy to put on, their structure means that the feet tend to slip out of the slippers when walking. Slippers are used in many situations in daily life due to their ease and speed of putting on, but there are concerns that wearing them for long periods of time may have a negative impact on the feet and posture. If you walk carefully to prevent your slippers from slipping off, unnatural pressure is applied to the toes, which can easily disrupt your walking posture balance.

[0003] Walking ability is generally evaluated based on speed, endurance, stability, etc. Normal walking involves the heel touching the ground, the center of pressure passing through the outside of the foot, and then turning inward after the entire sole of the foot has touched the ground, and finally pushing off with the forefoot. The sole of the foot is planted evenly on the floor or ground, the pelvis is properly placed on top of that, the spine is straightened on top of that, and the neck and head are also placed on top of that. When the forefoot steps out and touches the ground, the center of gravity shifts from the center of the heel along the outside of the sole, then rolls to the base of the middle toe, and the toes touch the ground. The center of gravity then shifts from the base of the big toe to a movement that grips the ground with all of the toes. Once the center of gravity is on the base of the big toe, the toes kick off the ground. This type of foot movement is called "sole rolling."

[0004] Slippers are footwear that intentionally do not have a heel fixing function, so when walking, people unconsciously adopt a walking style that prevents them from slipping off.Footwear that does not have a heel fixing function, such as slippers and sandals, inhibits the natural rolling when walking, making it difficult to adopt a normal walking posture.

[0005] The footwear of Patent Document 1 has a structure in which a rubber belt is provided in a position hidden inside the upper part, and the instep is fixed inside the upper part. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3220159 Summary of the Invention [Problem to be solved by the invention]

[0007] These footwear have a rubber belt inside the upper that secures the top of the foot, which makes it a little easier to slip off the slippers, but the heel is not secured and the sole does not fit snugly to the bottom of the foot, so it is not possible to completely eliminate the discomfort of walking in them.

[0008] Therefore, this invention provides slippers that have a sole that fits snugly to the unevenness of the sole of the foot and a sloped bottom that makes kicking off and landing smooth, thereby wrapping the foot three-dimensionally and supporting rolling when walking. [Means for solving the problem]

[0009] The slippers of this invention have a sole part that supports the sole of the foot and has a protrusion on the surface that the sole comes into contact with, corresponding to the arch of the foot, and a depression in the part that comes into contact with the heel, and an upper part that forms an arch-shaped space that covers the instep, located in front of the sole part, and are characterized by having a core material inside the sole part that is made of a material harder than the outer material of the sole part and has a surface with unevenness that matches the unevenness of the sole of the foot.

[0010] According to this invention, the sole part supports the sole of the foot and has a protrusion on the surface that the sole comes into contact with, corresponding to the arch of the foot, and a depression in the part that comes into contact with the heel.The sole part is equipped with a core material made of a harder material than the outer material of the sole part, with unevenness on the surface that matches the unevenness of the sole of the foot.This completely encases the sole of the foot and provides firm support to prevent the slippers from slipping when walking, allowing you to maintain correct walking posture, does not hinder rolling when walking, and makes it possible to provide slippers that are easy to walk in for long periods of time without getting tired.

[0011] The slippers of the present invention are also characterized by having a slope on the heel side of the bottom surface of the sole portion that comes into contact with the floor.

[0012] According to this invention, the sole part supports the sole of the foot and has a protrusion on the surface that the sole comes into contact with in the area corresponding to the arch of the foot, and a depression in the area that comes into contact with the heel.The sole part is equipped with a core material made of a hard material with unevenness on the surface that matches the unevenness of the sole of the foot.This completely encases the sole of the foot and provides firm support to prevent the slippers from slipping when walking, allowing you to maintain correct walking posture, does not hinder rolling when walking, and makes it easy to walk for long periods of time without getting tired.

[0013] The slippers of the present invention are also characterized by having a slope on the toe side of the bottom surface of the sole that comes into contact with the floor.

[0014] This invention provides slippers that completely encase the soles of the feet and provide firm support to prevent the slippers from slipping off while walking. It allows you to maintain a correct walking posture, does not impede rolling while walking, and makes it easy to walk for long periods without getting tired.

[0015] The slippers of the present invention are characterized by having a slope on the heel side of the bottom surface of the core material.

[0016] According to this invention, a heel slope is provided on the heel side of the bottom surface of the core material, which allows the wearer to maintain a correct walking posture, does not hinder rolling while walking, and provides slippers that do not tire the wearer even when walking for long periods of time.

[0017] The core material of the slippers of the present invention is characterized by a hardness of 60 to 75. The hardness is measured using a hardness tester conforming to the JIS S6050 standard.

[0018] According to this invention, the core material has just the right amount of hardness, making the slippers sturdy enough to withstand the weight of the slippers, and also has some elasticity, so it can completely wrap around the soles of the feet and provide firm support.

[0019] The slippers of the present invention are also characterized by having a plurality of curved grooves on the bottom surface of the core material.

[0020] According to this invention, the weight load on the core material 3 is distributed, making the core material 3 less likely to break, and making the slippers 100 sturdy. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a plan view showing a right foot wearing slippers 100 according to a first embodiment of the present invention. [Figure 2] 1 is a bottom view showing the stone foot of the slipper 100 according to the first embodiment of the present invention. [Figure 3] 1 is a left side view showing a right foot wearing slippers 100 according to a first embodiment of the present invention. [Figure 4] 1 is a right side view showing a right foot wearing slippers 100 according to a first embodiment of the present invention. [Figure 5] 1 is a perspective view showing a right foot wearing a slipper 100 according to a first embodiment of the present invention. [Figure 6] 1 is a bottom view of the core 3 of the right foot of the slipper 100 according to the first embodiment of the present invention. FIG. [Figure 7]1 is a plan view of the core 3 for the right foot of the slipper 100 according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a reference perspective view for explaining the core 3 of the right foot of the slipper 100 according to the first embodiment of the present invention. [Figure 9] FIG. 2 is a reference perspective view for explaining the core 3 of the right foot of the slipper 100 according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a reference perspective view for explaining the core 3 of the right foot of the slipper 100 according to the first embodiment of the present invention. [Figure 11] 1 is a reference diagram for explaining how to use the slipper 100 according to the first embodiment of the present invention. [Figure 12] 1 is a table showing the number and details of subjects in verification experiment 1 of embodiment 1 of the present invention. [Figure 13] 1 shows data of all subjects in verification experiment 1 of embodiment 1 of the present invention. [Figure 14] 1 shows data of a male subject in verification experiment 1 of embodiment 1 of the present invention. [Figure 15] 1 shows data of a female subject in verification experiment 1 of embodiment 1 of the present invention. [Figure 16] 10 is a plan view showing a right foot wearing a slipper 200 according to a second embodiment of the present invention. FIG. [Figure 17] 10 is a bottom view showing the stone foot of a slipper 200 according to a second embodiment of the present invention. FIG. [Figure 18] 10 is a left side view showing a right foot wearing slippers 200 according to a second embodiment of the present invention. FIG. [Figure 19] 10 is a right side view showing a right foot wearing slippers 200 according to a second embodiment of the present invention. FIG. [Figure 20] FIG. 10 is a perspective view showing a right foot wearing a slipper 200 according to a second embodiment of the present invention. [Figure 21] 10 is a reference left side view of the sole 4 of the slipper 200 according to the second embodiment of the present invention. FIG. [Figure 22] 10 is a reference bottom view of the sole 4 of the slipper 200 according to the second embodiment of the present invention. FIG. [Figure 23] 10 is a reference right side view of the sole 4 of the slipper 200 according to the second embodiment of the present invention. FIG. [Figure 24] 10 is a bottom view showing the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention. FIG. [Figure 25] 10 is a plan view showing the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention. FIG. [Figure 26] FIG. 10 is a reference perspective view for explaining the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention. [Figure 27] FIG. 10 is a reference perspective view for explaining the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention. [Figure 28] FIG. 10 is a reference perspective view for explaining the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention. [Figure 29] 10 is a reference diagram for explaining how to use the slipper 200 according to the second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the best mode for carrying out the invention will be described with reference to the accompanying drawings.

[0023] (Embodiment 1) Fig. 1 is a plan view showing the right foot of the slipper 100 according to the first embodiment of the present invention, Fig. 2 is a bottom view, Fig. 3 is a left side view showing the right foot of the slipper 100 according to the first embodiment of the present invention, Fig. 4 is a right side view, Fig. 5 is a perspective view showing the right foot of the slipper 100 according to the first embodiment of the present invention.

[0024] As shown in Figure 1, the slipper 100 of the first embodiment of the present invention mainly comprises a sole 2 on which the sole of the foot rests and an upper 1 that wraps around the top of the foot. As shown in Figure 2, the underside of the sole 3, i.e., the bottom surface that comes into contact with the floor, is gourd-shaped with a narrowed center and a thick fabric. Because the slipper 100 of the first embodiment of the present invention has a thick fabric on the bottom surface, it is quiet when walking and has less impact when landing, making it a slipper 1 that allows for comfortable walking.

[0025] The sole 3 contains a core 3 made of a hard material. The core 3 (described later) has an uneven surface that fits the shape of the sole of the foot, and the surface of the sole also has unevenness that matches the shape of the core 3.

[0026] 1 to 5 show a right foot wearing slippers 100 according to a first embodiment of the present invention. As shown in Fig. 3 and Fig. 4, the right foot wearing slippers 100 according to the first embodiment of the present invention has a thicker central portion of the sole 2 on the left side view, i.e., the side facing the medial side of the foot, compared to the right side view, i.e., the side facing the lateral side of the foot. Because the sole 3 is thicker in the central portion on the side facing the medial side of the foot, when worn, the arch of the sole fits into the uneven surface of the sole 3, providing a comfortable fit and support that envelops the entire foot.

[0027] 3, the slipper 100 has a slope on the toe side, with the tip of the toe rising upward in a side view. The angle b between the floor surface and the toe side edge is preferably between 10 and 20 degrees. With the toe side rising upward, the movement of pushing off the floor with the front toes when walking can be performed smoothly and naturally.

[0028] Furthermore, the slipper 100 also has a slope on the side edge of the heel, and as shown in Figure 3, the tip on the heel side is raised in a side view. The angle a between the floor surface and the side tip is preferably between 10 and 20 degrees, the same as the angle on the toe side. Although the angles are similar, as shown in Figure 4, the area of ​​the slope on the heel side is smaller than that of the slope on the side of the toe. The slope on the side edge of the heel allows the foot to land smoothly and without impact when it strikes the ground after pushing off without interfering with the rolling motion during walking.

[0029] As shown in FIG. 5 , the upper surface of the sole 2 is provided with unevenness from the inside to the center that follows the arch of the foot, forming an arch ridge 21. The arch ridge 21 is a ridge with its peak at the center of the sole. The ridge line of the arch ridge 21 on the upper surface of the sole 2 gently rises from the end that contacts the side surface on the big toe side to the center, and then descends sharply from the central portion to the end that contacts the side surface on the little toe side, which descends to a lower point than the end that contacts the side surface on the big toe side. Therefore, the side surface on the big toe side, i.e., the side surface shown in the left side view of the right foot of the slipper 100, is thicker in the central portion of the sole 2 than the side surface on the little toe side, i.e., the side surface shown in the right side view of the right foot of the slipper 100.

[0030] The right slipper 100 is shaped to fit the shape of the sole of the right foot, and by providing a protrusion along the sole, it is possible to create a slipper 100 that provides a comfortable supportive feeling that wraps around the entire foot. The left slipper 100 is shaped to fit the sole of the left foot, and is shaped to snugly wrap around both feet.

[0031] Fig. 6 is a bottom view of the right foot core 3 of the slipper 100 according to the first embodiment of the present invention, and Fig. 7 is a plan view. Figs. 8 to 10 are reference perspective views for explaining the right foot core 3 of the slipper 100 according to the first embodiment of the present invention.

[0032] The slipper 100 of the first embodiment of the present invention has a core 3 enclosed within a sole 2. The sole 2 has a core 3 made of a hard material inside, which is then wrapped around a cushioning layer or fabric, which is then sewn or glued together. The core 3 is made of a high-hardness EVA material. EVA material, also known as EVA resin, is an abbreviation for ethylene-vinyl acetate copolymer resin. It is lightweight, flexible, resilient, durable, and tear-resistant, making it ideal for cushioning. EVA materials come in a variety of hardnesses, from soft to hard, but the core 3 of the slipper 100 of the first embodiment of the present invention uses a relatively hard EVA material. The core 3 is made of a harder material than the outer material of the sole 2, and has a surface that comes into contact with the sole of the foot and has a texture that matches the contours of the sole.

[0033] The hardness of the EVA material of the core 3 is preferably between 60 and 75, with the optimum being between 65 and 70. The hardness is measured using a hardness tester conforming to JIS S6050. In Example 1 of the present invention, the hardness of the core material of the sole of a typical slipper, measured using a Teclock GS-701N rubber and plastic hardness tester, is approximately 50 to 60. Therefore, the hardness of the core 3 of the slipper 100 of the present invention is harder than that of the core material of a typical slipper. If the hardness of the core 3 is too low, it will be easily crushed and deformed by the weight load on the slipper 100, and if the hardness is too high, it will crack or break when subjected to a strong impact. Therefore, the hardness of the core 3 is set to a level that fully utilizes the functionality of the slipper 100 of the present invention.

[0034] The top surface of core material 3, i.e., the surface closest to the surface that comes into contact with the sole of the foot, is provided with ridges and depressions that follow the unevenness of the sole of the foot, and the bottom surface of core material 3, i.e., the surface closest to the floor, is provided with curved grooves 31 and a heel slope 34. The unevenness of the surface of core material 3 closest to the surface that comes into contact with the sole of the foot forms the unevenness of the top surface of sole 2, forming a shape that fits the sole of the foot. The grooves 31 and heel slope 34 are provided on the surface of core material 3 closest to the floor, supporting the function of the bottom surface of the sole.

[0035] As shown in FIG. 6, the bottom surface of the core 3 is provided with a partially curved groove 31 extending from the center upward. The groove 31 is a curved groove extending from one end to the other in the longitudinal direction of the slipper 100, and is a narrow groove with a curved shape that curves upward, i.e., toward the toe. By providing the curved groove 31 on the bottom surface of the core 3, the weight load on the core 3 is distributed, making the core 3 less likely to break, resulting in a sturdy slipper 100. The heel edge of the core 3 is provided with a slope, forming a heel slope 34. By providing the heel slope 34 on the core 3, the heel of the sole 3 containing the core 3 also has a heel slope 27 formed at the heel edge, just like the core 3. When walking in slippers, the side of the heel touches the ground when the foot pushes off and lands, but the heel slope 27 on the heel side makes the landing smooth and natural, does not hinder rolling when walking, and allows the user to maintain a correct walking posture.

[0036] As shown in Figure 7, the top surface of core material 3, i.e., the surface closest to the sole of the foot, has a protrusion in the area corresponding to the arch of the foot, forming arch protrusion 33, and also has a thin protrusion in the area corresponding to the base of the toes, forming toe arch protrusion 32. The arch protrusion 33 and toe arch protrusion 32 provide slippers that fit snugly to the contours of the sole of the foot, providing a comfortable fit, and because they snugly encase the foot, there is no need to strain when walking to prevent the slippers from slipping off, and you can walk naturally with a relaxed stance, which does not hinder rolling while walking and allows you to maintain a correct walking posture.

[0037] As shown in Figure 8, the core material 3 has a three-dimensional curve, with the toe side and the heel side both rising upward. The core material 3 is made of a hard material such as resin and is enclosed in the sole 2 of the slipper 100, preventing the slipper 100 from losing its shape and enabling the slipper 100 to provide firm support for the foot even when weight is applied.

[0038] As shown in Figure 9, the angle a formed between the heel slope 34 and the floor and the angle b formed between the toe side and the floor are preferably between 10 and 30 degrees, and the area of ​​the slope on the toe side is larger than the area of ​​the heel slope. As shown in Figure 10, the heel slope 34 is formed by shaving off the tip of the heel of the core material 3 at an angle.

[0039] 11 is a reference diagram for explaining how to use the slipper 100 according to the first embodiment of the present invention. The slipper 100 does not hinder rolling while walking and supports a correct walking posture.

[0040] (Verification experiment 1) The results of verification experiment 1, which compared the slipper 100 of the present invention with a regular flat-soled slipper, are described below.

[0041] (Verification method for Verification Experiment 1) Subjects: 31 healthy individuals (16 men, 15 women) Measurement time: 1 hour from 7:30 to 18:30 Measurement equipment: Gait analysis device and software AYUMI EYE Measuring equipment manufacturer: Waseda Elderly Health Foundation Co., Ltd. Measurement equipment performance: Parameter display of scored propulsion (walking speed, stride length), balance (RMS: Root Mean Square "square root of left and right acceleration"), rhythm (walking cycle variance), and actual measured values ​​of walking speed (m / s), stride length (cm), and walking cycle variance (seconds) can be measured.

[0042] In verification experiment 1, participants were asked to wear regular slippers and then the slippers 100 of the present invention, and walked 10 meters with each. As shown in Figure 12, there were 31 subjects in verification experiment 1, consisting of 17 men and 14 women. The evaluation items included walking ability (total ability, propulsion, balance, rhythm score, stride length cm, walking speed m / s, walking cycle seconds, and RMS (Root Mean Square)).

[0043] For statistical analysis, a paired t-test was performed on the average walking ability measurement results when wearing regular slippers and when wearing the slipper 100 of this invention. All statistical processing was performed using the statistical analysis software SPSS Statistic24 (International Business Machines Corporation, Illinois, USA), with a statistical significance level of 5%. In addition, video of the subjects' walking state was taken from the side, focusing on the feet. The characteristics of the walking form at maximum walking when wearing regular slippers and when wearing the slipper 100 of this invention were compared.

[0044] (Results of Verification Experiment 1) As shown in Figure 13, the walking measurements showed that walking time when wearing the inventive slippers 100 was reduced by an average of -0.2 seconds compared to when wearing regular slippers, and walking speed (m / s) increased by an average of 3.9 m / s. Stride length significantly increased by 2.9 cm (p=0.011). Gait cycle was reduced by an average of -0.01 seconds, but no significant difference was observed. Furthermore, the "total score" of walking performance when wearing the inventive slippers 100, calculated by AYUMI EYE, was significantly higher by 3.1 points (p<0.001), "propulsion force" was also significantly higher by 3.1 points (p<0.001), and "RMS" significantly increased by 0.14 points (p=0.001). "Rhythm" during walking was 4.1 points higher, but no significant difference was observed. Meanwhile, "balance" was significantly lower by an average of -2.0 points (p=0.002). As shown in Figure 14, for men only, the "propulsion force" score was significantly higher by an average of 3.9 points, and for women only, stride length increased significantly by 4.8 cm (p=0.016). Furthermore, as shown in Figure 15, for women only, the "total score," "propulsion force," and "RMS" scores were also significantly higher. For women only, the "balance" score was significantly lower by -2.8 points (p=0.01), as with the overall group. Furthermore, when comparing overall stride length, stride length was significantly wider when wearing the slippers 100 of the present invention compared to regular slippers.

[0045] (Verification experiment 2) In addition, a comparison was made by taking videos of the walking state when wearing regular slippers and when wearing the slippers 100 of the present invention. From the videos taken, it was found that when wearing the slippers 100 of the present invention, rolling and foot tilting were more pronounced.

[0046] (Consideration) In Verification Experiments 1 and 2, the walking conditions when wearing regular slippers and the slipper 100 of the present invention were compared using AYUMI EYE. As a result, it was revealed that the slipper 100 of the present invention allows for a wider stride compared to regular slippers. This is thought to be due to the shape of the sole that supports rolling and swinging, i.e., the raised shape of the heel and toe, which induces a natural gait and draws out the power of the final push-off with the toes. Furthermore, not only does the functional push-off increase the swing of the leg, but the push-off force, which is achieved by effectively using the toes, also accelerates the shift of the center of gravity, effectively affecting the propulsion force when walking.

[0047] On the other hand, the "balance" score calculated by the AYUMI EYE's three-axis (X-axis: front-to-back, Y-axis (left-to-right), Z-axis: up-to-down) accelerometer was low when the slipper 100 of the present invention was worn. This is thought to be due to increased instability on the Y-axis caused by a stronger push-off. Therefore, rather than interpreting this result as a deterioration in gait, it is thought to be due to a change to a more dynamic gait. If functional slippers with these functions can improve gait, it is thought that foot disorders such as hallux valgus and collapsed arches caused by the use of simple footwear such as slippers, as well as back pain and hip joint disorders caused by poor gait, can be prevented. This is thought to have a beneficial effect on foot development, especially during the school-age period, when growth and development is rapid. Furthermore, even for people who wear tight-fitting footwear for long periods of time, it is effective to relax their feet during leisure time. Furthermore, maintaining good foot condition is essential for athletes, and using these slippers as footwear during leisure time can help prevent and alleviate sports injuries.

[0048] In addition, it is expected that daily use of the slippers 100 of this invention will effectively mobilize the muscles in the lower limbs, thereby improving muscle strength, and improving core muscle strength through propulsion. This will provide a good stimulus to the whole body in everyday life, even without exercise or training, and is also expected to have the effect of increasing calories burned and helping people to shape up. This test suggests that the slippers 100 of the present invention can improve stride length and propulsion when walking. It was found that improving walking patterns in daily life is likely to have the functionality to prevent foot disorders and back pain, as well as contribute to improving lower limb and trunk muscle strength.

[0049] (Embodiment 2) Next, slippers 200 according to a second embodiment of the present invention will be described with reference to Figs. 16 to 29. Fig. 16 is a plan view showing the right foot of slippers 200 according to the second embodiment of the present invention, and Fig. 17 is a bottom view. Fig. 18 is a left side view showing the right foot of slippers 200 according to the second embodiment of the present invention, and Fig. 19 is a right side view. Fig. 20 is a perspective view showing the right foot of slippers 200 according to the second embodiment of the present invention.

[0050] As shown in Fig. 16, slippers 200 according to a second embodiment of the present invention mainly comprise a sole 2 on which the sole of the foot rests and an upper 1 that encases the top of the foot. As shown in Fig. 17, the underside of sole 3, i.e., the bottom surface that comes into contact with the floor, is gourd-shaped with a narrowed center and a bottom portion 4 made of elastic EVA material. Bottom portion 4 has a curved groove. Because slippers 200 according to the second embodiment of the present invention have bottom portion 4 made of elastic EVA material on the bottom surface of the slippers, they are less likely to slip when walking, making slippers 200 safer to walk in.

[0051] The sole 3 contains a core 3 made of a hard material. The core 3 (described later) has an uneven surface that fits the shape of the sole of the foot, and the surface of the sole also has unevenness that matches the shape of the core 3.

[0052] 16 to 20 show a right foot wearing slipper 200 according to the second embodiment of the present invention. As shown in Fig. 18 and Fig. 19, the right foot wearing slipper 200 according to the first embodiment of the present invention has a thicker central portion of sole 2 on the left side view, i.e., the side facing the medial side of the foot, compared to the right side view, i.e., the side facing the lateral side of the foot. Because sole 3 is thicker in the central portion on the side facing the medial side of the foot, when worn, the arch of the foot fits into the uneven surface of sole 3, providing a comfortable fit and support that envelops the entire foot.

[0053] As shown in Fig. 18, in a side view, the slipper 200 has a slope on the toe side, with the tip of the toe rising upward. The heel side also has a slope, with the tip of the heel side rising upward. The angle b formed between the toe side and the floor is preferably between 10 degrees and 30 degrees, and the area of ​​the slope on the toe side is larger than the area of ​​the slope on the heel. With the toe side rising upward, the movement of pushing off the floor with the front toes when walking can be made smooth and natural.

[0054] Furthermore, the slipper 200 also has a slope on the side edge of the heel, and as shown in Figures 18 and 19, the tip on the heel side is raised in side view. The angle a between the floor surface and the side tip of the heel is preferably between 10 and 20 degrees, the same as the angle on the toe side. Although the angles are similar, as shown in Figure 17, the area of ​​the slope on the heel side is smaller than the slope on the side of the toe. The slope on the side edge of the heel does not interfere with the rolling of the foot when pushing off and landing on the ground with the heel, allowing for smooth and shock-free landing.

[0055] As shown in FIG. 20 , the upper surface of the sole 2, i.e., the surface closest to the sole, is provided with concaves and convexes along the arch of the foot from the inside to the center, forming an arch ridge 21. The arch ridge 21 is a ridge with its peak at the center of the sole. The ridge line of the mid-arch portion 21 on the upper surface of the sole 2 gently rises from the edge that contacts the side of the big toe side to the center, and then descends sharply from the central portion to the edge that contacts the side of the little toe side, which edge descends to a lower point than the edge that contacts the side of the big toe side. Therefore, the side of the big toe side, i.e., the side shown in the left side view of the right foot of the slipper 200, is thicker in the central portion of the sole 2 than the side of the little toe side, i.e., the side shown in the right side view of the right foot of the slipper 200.

[0056] The right foot slipper 200 is not symmetrical in shape, but has a protrusion along the sole, which allows the slipper 200 to provide comfortable support that wraps around the entire foot. The left foot slipper 200 has a shape that is a mirror image of the right foot slipper 200, allowing both feet to be snugly wrapped around.

[0057] Fig. 21 is a reference left side view of the sole 4 of the slipper 200 according to the second embodiment of the present invention, Fig. 22 is a reference bottom view, and Fig. 23 is a reference right side view of the sole 4 of the slipper 200 according to the second embodiment of the present invention.

[0058] The sole 4 is made of EVA material. EVA material, also known as EVA resin, is an abbreviation for ethylene-vinyl acetate copolymer resin. It is lightweight, flexible, resilient, strong, and tear-resistant, making it ideal for use as a cushioning material. The sole 4 of the slipper 200 is made of a resilient material, and in addition to EVA material, rubber or resin materials may also be used to provide flexibility.

[0059] Fig. 24 is a bottom view showing the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention, and Fig. 25 is a plan view. Figs. 26 to 28 are reference perspective views for explaining the core 3 of the right foot of the slipper 200 according to the second embodiment of the present invention.

[0060] In the slipper 200 of the second embodiment of the present invention, a core 3 is embedded in the sole 2. The material and hardness of the core 3 are the same as those of the slipper 100 of the first embodiment, and therefore will not be described here. The core 3 is preferably made of an EVA material with a certain degree of hardness, but resin materials, wood, etc. can also be used. The hardness of the core 3 is preferably between 60 and 75, with the optimum being between 65 and 70. The top surface of the core 3, i.e., the surface closest to the sole of the foot, is provided with an indentation that conforms to the sole's response, and the bottom surface of the core 3 is provided with a curved groove 31 and a heel slope 34. The indentations on the top surface of the core 3 form the indentations on the top surface of the sole 2, forming a shape that fits the sole of the foot, while the groove 31 and heel slope 34 on the bottom surface of the core 3 support the function of the bottom surface of the sole.

[0061] As shown in FIG. 24 , a partially curved groove 31 is provided on the bottom surface of the core material 3 from the center upward. The groove 31 is a curved groove extending from one end to the other in the longitudinal direction of the slipper 200, and is a narrow groove with a curved shape that curves upward, i.e., toward the toe. A slope is provided on the heel side edge of the core material 3, forming a heel slope 34. The provision of the heel slope 34 on the core material 3 also forms a slope on the heel of the sole 3 that contains the core material 3. When walking in the slippers, the side of the heel touches the ground when landing after pushing off, but the upward-rising shape of the heel side allows for a smooth and natural landing, does not hinder rolling while walking, and allows for proper walking posture to be maintained.

[0062] As shown in Figure 25, the upper surface of the core material 3 has a protrusion in the area corresponding to the arch of the foot, forming arch protrusion 33, and also has a thin protrusion in the area corresponding to the base of the toes, forming toe arch protrusion 32. The arch protrusion 33 and toe arch protrusion 32 provide slippers that fit snugly to the contours of the sole of the foot, providing a comfortable fit, and because they snugly encase the foot, there is no need to strain when walking to prevent the slippers from slipping off, and you can walk naturally with a relaxed posture, which does not hinder rolling while walking.

[0063] As shown in FIG. 26, the core 3 has a three-dimensional curve, with the toe and heel sides rising upward. As shown in FIG. 27, the angle a formed between the heel-side slope and the floor is 20 to 30 degrees, and the angle formed between the toe-side slope and the floor is also 20 to 30 degrees. The core 3 is made of a hard material such as resin and is embedded in the sole 2 of the slipper 200 to prevent the slipper 200 from losing its shape. The high hardness of the core 3 allows the slipper 200 to provide firm support for the foot even when weight is applied to the sole 2. As shown in FIG. 28, the heel slope 34 is formed by diagonally scraping off the heel tip of the core 3.

[0064] Figure 29 is a reference diagram for explaining how to use slippers 200 according to the second embodiment of the present invention. Slippers 200 support correct walking posture without interfering with rolling while walking. It is expected that daily use of slippers 100 according to the present invention will effectively mobilize the muscles of the lower limbs, improving muscle strength and improving core muscle strength through propulsion. This will provide a good stimulus to the whole body in daily life, not just exercise or training, and is expected to have the effect of increasing calories burned and helping people to shape up. [Explanation of symbols]

[0065] 100,200 slippers 1 Upper 11 Inner surface of the upper 12 Opening 2 soles 21 Arch ridge 22 Heel dent 23 bottom 24 Waist 25 recess 26 Sole side 3 Core material 31 Groove 32 Toe arch prominence 33 Arch ridge 34 heel slope 4 Bottom 41 Groove H feet

Claims

1. A sole portion that supports the sole of the foot and has a protrusion on the surface that the sole comes into contact with, in a portion corresponding to the arch of the foot, and a depression in a portion that comes into contact with the heel; an upper part that forms an arch-shaped space covering the instep and is provided in front of the sole part; The slippers are characterized in that the sole portion is provided with a core material made of a material harder than the outer material of the sole portion and having a surface with irregularities that match the irregularities of the sole of the foot.

2. A sole portion that supports the sole of the foot and has a protrusion on the surface that the sole comes into contact with, in a portion corresponding to the arch of the foot, and a depression in a portion that comes into contact with the heel; An upper part that forms an arch-shaped space that covers the instep and is provided in front of the sole part; a core material contained in the sole portion and made of a material harder than an outer material of the sole portion, The core material has a surface provided with irregularities that correspond to the irregularities of the sole of the foot, and has a curved groove extending from the center of the bottom surface toward the toe, from one end to the other end in the short direction, The protrusion of the sole part is a protrusion having an apex in the central part of the sole, gently rising from the end in contact with the side surface on the big toe side to the center, and descending smoothly from the central part as an apex to the end in contact with the side surface on the little toe side, the end in contact with the side surface on the little toe side descending to a position lower than the end in contact with the side surface on the big toe side.

3. The slippers according to claim 1 or 2, characterized in that the tip of the heel side of the bottom surface of the sole portion that comes into contact with the floor has a slope, and the tip of the heel side is raised upward, and the angle formed by the floor surface and the tip of the heel side is 10 to 20 degrees.

4. 3. The slippers according to claim 1, wherein a slope is provided on the toe side of the bottom surface of the sole portion that contacts the floor.

5. 3. The slippers according to claim 1, wherein the bottom surface of the core material has a slope on the heel side.

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