Plate for shoe sole, shoe sole and shoe

Abstract

The utility model discloses a plate for a sole, which comprises a plate body, an area of the plate body corresponding to a metatarsophalangeal joint of a foot sinks downwards to form a concave structure, the section of the concave structure in a foot width direction at least comprises an arch with an upward arch opening, and an area of the plate body corresponding to a forefoot of the foot is provided with at least one stress release groove. The utility model further discloses a sole with the plate and a shoe with the plate. Energy release of a forefoot transverse arch area is improved through the downward-concave structure of the plate, the force feedback efficiency in the movement process is improved, overall acting force transmission of the plate can be cut off by arranging the stress release grooves when the foot falls on the ground, on one hand, acting force is concentrated on the metatarsophalangeal joint of the forefoot, the plate is compressed to generate deformation, and on the other hand, the stress release grooves are formed; on the other hand, the flexible bending performance of the sole can be kept, and the wearing comfort of the shoe is improved.

Description

Technical Field

[0001] This utility model relates to the field of footwear technology, and in particular to a board, sole, and shoe for shoe soles. Background Technology

[0002] To enhance the overall performance of athletic shoes, a special plate is often cleverly embedded in the sole. These plates come in various types, such as carbon fiber plates, thermoplastic polyurethane (TPU) plates, and nylon plates. The main function of this plate is to improve the support and stability of the sole, distribute the pressure and impact during exercise, reduce sole deformation and wear, and also improve comfort and support. Furthermore, the plate's elasticity and resilience help athletes better control the direction and force of their movements, improving stability, reaction speed, and balance, thus leading to better performance in competitive sports.

[0003] Currently, these specially made boards generally adopt a flat plate structure, such as flat carbon fiber boards. Although flat carbon fiber boards can provide a certain degree of support and stability, they have limited performance in terms of energy feedback. They cannot effectively capture and convert the reaction force from the ground, resulting in less energy being fed back to the wearer and poor performance in terms of force feedback efficiency. In view of this, this case was developed. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a plate, sole, and shoe for shoe soles, which improves force feedback efficiency during exercise by enhancing energy release in the forefoot transverse arch area.

[0005] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0006] This utility model discloses a plate for shoe soles, which includes a 3D structured plate body. The plate body is recessed downward in the area corresponding to the metatarsophalangeal joint of the foot to form a concave structure. The cross-section of the concave structure in the foot width direction includes at least one arch shape with the arch facing upward.

[0007] Preferably, the curvature of the concave structure gradually decreases from its middle forward and / or from its middle backward. This makes the cross-section of the concave structure in the foot-length direction a downward-concave arc or bow shape, which can store energy and release it when the foot swings forward, thereby propelling the wearer forward and providing better propulsion during the push-off phase. Furthermore, it can better guide the force transmission of the foot, allowing the wearer to exert force more smoothly during exercise, reducing energy loss and improving exercise efficiency.

[0008] Preferably, the area of ​​the plate corresponding to the toe bones of the foot curves forward along the length of the foot, which helps to improve the wearer's toe bone extension force, increase propulsion, reduce energy loss, and achieve better extension efficiency.

[0009] Preferably, the concave structure extends forward to completely or partially cover the area of ​​the plate corresponding to the metatarsal bones of the foot, and / or the concave structure extends backward to completely or partially cover the area of ​​the plate corresponding to the metatarsal bones of the foot. Expanding the front and rear coverage of the concave structure can, on the one hand, increase the force-bearing area of ​​the plate and improve energy storage to further enhance energy release in the forefoot transverse arch area, and on the other hand, improve the comfort of movement.

[0010] As an improvement of this utility model, the concave structure includes a concave portion and wing-support portions extending outward from both the inner and outer sides of the concave portion. The wing-support portions can, on the one hand, increase the contact area between the concave structure and the foot (indirect contact), providing a certain degree of support and improving the comfort of stepping on the foot; on the other hand, they can ensure that the concave structure can expand outward when deformed under pressure, ensuring the effectiveness of the elastic potential energy stored in the concave structure under pressure deformation.

[0011] Preferably, the wing support portion gradually transitions outward to a straight line from its connection with the recessed portion.

[0012] Preferably, the width of the recessed portion accounts for 45% to 90% of the width of the recessed structure.

[0013] As an improvement of this utility model, at least one stress relief groove is provided in the area of ​​the forefoot corresponding to the plate body.

[0014] Preferably, at least one stress relief groove is provided on the inner side of the area corresponding to the forefoot of the foot of the plate, and / or at least one stress relief groove is provided on the outer side of the area corresponding to the forefoot of the foot of the plate.

[0015] Preferably, the stress relief groove extends inward from the edge of the plate.

[0016] Preferably, the stress relief groove extends inward to a depth of one-third of the plate width in the foot-width direction. This balances the overall rigidity and deformation capacity of the plate.

[0017] Preferably, the stress relief groove is located in the area of ​​the plate corresponding to the metatarsophalangeal joint of the foot and / or the area corresponding to the metatarsal bones of the foot.

[0018] Preferably, the stress relief groove is straight, V-shaped, or arc-shaped.

[0019] Preferably, the width of the stress relief groove is 1 to 5 mm.

[0020] As an improvement of this utility model, the thickness of the recessed structure is greater than the thickness of other parts of the plate.

[0021] Preferably, the concave structure extends rearward to completely or partially cover the area of ​​the plate corresponding to the metatarsal bones of the foot, and the concave structure is thickest in the area corresponding to the second to third metatarsal bones of the foot, so that the concave structure can withstand greater pressure, thereby improving the service life and safety of the plate.

[0022] Preferably, the thickness of the concave structure gradually decreases from the second metatarsal bone to the first metatarsal bone, and gradually decreases from the third metatarsal bone to the fifth metatarsal bone, in order to optimize the stress distribution, making the overall structure of the concave structure more reasonable and efficient, and reducing the overall weight of the plate while maintaining the strength and stability of the concave structure.

[0023] Preferably, the thickness of the recessed structure can be selected from 1.0 to 1.8 mm, and more preferably from 1.0 to 1.5 mm.

[0024] This utility model also discloses a shoe sole using the above-mentioned plate, the shoe sole including a midsole and the above-mentioned plate embedded in the midsole.

[0025] Furthermore, the maximum depth of the recessed structure accounts for 38% to 86% of the thickness of the midsole.

[0026] Furthermore, the maximum depth of the recessed structure is 10-30 mm, and the thickness of the midsole is 13-35 mm.

[0027] Furthermore, the distance between the concave structure and the upper surface of the midsole accounts for 7% to 30% of the midsole thickness, and the distance between the concave structure and the lower surface of the midsole accounts for 7% to 30% of the midsole thickness. This ensures full utilization of the plate's rebound performance without excessively restricting the cushioning and rebound performance of the midsole, as well as the comfort of wearing the shoe.

[0028] This utility model also discloses a shoe using the above-mentioned sole.

[0029] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0030] (1) The plate of this utility model is recessed downward at least in the area corresponding to the metatarsophalangeal joint of the foot to form a concave structure. The arch of the concave structure faces upward and is opposite to the forefoot transverse arch with the arch facing downward. During movement, the forefoot transverse arch is compressed downward by the force applied by body weight and extension. The concave structure can deform and compress synchronously to absorb and disperse the applied force, thereby supporting the forefoot transverse arch, cushioning, and reducing the pressure on the forefoot transverse arch. At the same time, through the deformation of the concave structure in the vertical direction (i.e., the thickness direction), additional rebound feedback can be generated, realizing the utilization of energy at the metatarsophalangeal joint, improving the energy release in the forefoot transverse arch area, and improving the overall force feedback efficiency of the sole.

[0031] (2) The plate of this utility model is provided with stress relief grooves. When the foot lands, the stress relief grooves can cut off the force transmission of the plate as a whole. On the one hand, the force is concentrated on the metatarsophalangeal joint of the forefoot and the plate is compressed to produce deformation. On the other hand, it can maintain the flexible bending performance of the sole and improve the comfort of wearing the shoe.

[0032] (3) The thickness of the concave structure of this utility model is greater than the thickness of other parts of the plate. Increasing the thickness of the concave structure can enhance the rigidity of the concave structure, increase the stress of the concave structure, enable the concave structure to store more elastic potential energy, and at the same time improve the continuity of function and the durability of structure.

[0033] (4) By setting a plate inside the midsole of the shoe sole, the concave structure of the plate can store elastic potential energy as the forefoot transverse arch is compressed and deformed after the forefoot touches the ground and before it leaves the ground. During the process of leaving the ground, the stored elastic potential energy is released to provide rebound force feedback to the foot, realize the utilization of energy at the metatarsophalangeal joint, improve the energy release in the forefoot transverse arch area, and improve the overall force feedback efficiency of the shoe sole.

[0034] (5) In the sole of this utility model, the maximum depth of the concave structure accounts for 38% to 86% of the thickness of the midsole, so that the shoe can provide sufficient support and stability while maintaining lightness and flexibility, and ensure that the rebound performance of the plate is fully utilized, thereby improving running efficiency and speed. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the plate in Example 1.

[0036] Figure 2 for Figure 1 A side view diagram.

[0037] Figure 3 for Figure 1 A top-down view.

[0038] Figure 4 for Figure 3 Schematic diagram of sectional view AA.

[0039] Figure 5 for Figure 3 Schematic diagram of the BB section.

[0040] Figure 6 for Figure 3 Schematic diagram of the CC section.

[0041] Figure 7 for Figure 3 Schematic diagram of the cross-section of DD.

[0042] Figure 8 for Figure 3Schematic diagram of the EE section.

[0043] Figure 9 This is a simplified diagram illustrating the principle of the board in Example 1.

[0044] Figure 10 This is a three-dimensional structural diagram of a plate according to another preferred embodiment of the present invention.

[0045] Figure 11 for Figure 10 Schematic diagram of sectional view AA.

[0046] Figure 12 This is a three-dimensional structural diagram of a plate according to another preferred embodiment of the present invention.

[0047] Figure 13 for Figure 12 A side view diagram.

[0048] Figure 14 This is a three-dimensional structural diagram of the plate in Example 2.

[0049] Figure 15 for Figure 14 A top-down view.

[0050] Figures 16-19 This is a top view of a plate according to another preferred embodiment of the present invention.

[0051] Figure 20 This is a cross-sectional view of the plate in the foot length direction of Embodiment 3.

[0052] Figure 21 This is a cross-sectional view of the area of ​​the plate corresponding to the metatarsal bones of the foot in the foot width direction of Embodiment 3.

[0053] Figure 22 This is a top view of the midsole of Example 4.

[0054] Figure 23 for Figure 14 Schematic diagram of sectional view AA.

[0055] Figure 24 for Figure 14 Schematic diagram of the BB section.

[0056] Figure 25 This is a clustered bar graph showing the single-step step length of the experimental and control examples in Example 5.

[0057] Figure 26 This is a clustered bar graph showing the single-step time of the experimental and control examples in Example 5.

[0058] Figure 27 This is a stacked bar chart showing the percentage of support time and levitation time for the experimental and control examples in Example 5.

[0059] The components are: 1. Plate; 11. Region corresponding to the phalanges of the foot; 12. Region corresponding to the metatarsophalangeal joint of the foot; 13. Region corresponding to the metatarsals of the foot; 14. Region corresponding to the midfoot of the foot; 15. Region corresponding to the hindfoot of the foot; 2. Concave structure; 21. Concave part; 22. Wing support part; 3. Stress relief groove; 4. Midsole. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0061] In the following description, the terms indicating direction such as foot length, foot width, front, back, inner side, and outer side are observed from the wearer's perspective. For example, front refers to the direction of the toes, back refers to the direction of the heel, inner side refers to the inner side of the foot (the side of the first toe) in the direction of foot width, and outer side refers to the outer side of the foot (the side of the fifth toe) in the direction of foot width.

[0062] The foot comprises the forefoot, midfoot, and hindfoot. Based on functional anatomical analysis of the foot during movement, the forefoot contains two major structures: the transverse arch and the metatarsophalangeal joints. The transverse arch is formed by the first to fifth metatarsal heads. In walking, running, jumping, and changing direction, the transverse arch is a crucial weight-bearing and force transmission area. The metatarsophalangeal joints are formed by the five metatarsal heads and the base of the proximal phalanges. For rapid push-off movements such as running and jumping, the final action occurs at the metatarsophalangeal joints. Research indicates that during the braking phase of movement, the transverse arch absorbs and withstands the impact of ground reaction forces; during the push-off phase, forces generated by the hip, knee, and ankle are transmitted from the hindfoot to the transverse arch region and released there, propelling the body off the ground.

[0063] Most existing shoe soles focus only on the support and stability of the sole and the force exerted by the foot, with little research on utilizing the energy at the metatarsophalangeal joint through the materials and structure of athletic shoes to improve the energy release of the forefoot transverse arch. This invention addresses this issue, resulting in a plate, sole, and shoe that utilize energy from the metatarsophalangeal joint to enhance the energy release of the forefoot transverse arch, as well as a method for improving the force feedback efficiency of the sole.

[0064] Example 1

[0065] Figure 1 The board for the left foot is shown, while the board for the right foot is symmetrical to it. The board for the right foot is not shown.

[0066] The boards are mainly made of fiber-reinforced resin, such as T700 carbon fiber boards and T800 carbon fiber boards. The fibers used to reinforce the resin include carbon fiber, glass fiber, aromatic polyamide fiber, ultra-high molecular weight polyethylene fiber, modified polyphenylene ether fiber, boron fiber, etc.

[0067] like Figure 3 The diagram illustrates the positional relationship between the plate and the wearer's foot in this embodiment. The plate in this embodiment is a full-length plate; in other embodiments, it could be a partial carbon plate or a half-length carbon plate covering only the metatarsophalangeal joint. In this embodiment, the plate covers the entire sole of the foot from toe to heel, and includes a plate body 1 with a 3D structure. The plate body 1 has a region corresponding to the forefoot, a region 14 corresponding to the midfoot, and a region 15 corresponding to the hindfoot. The region corresponding to the forefoot is further divided into a region 11 corresponding to the phalanges and a region 13 corresponding to the metatarsals. Because the metatarsophalangeal joint is formed by the metatarsal head and the base of the proximal phalanx, the region 12 of the plate body 1 corresponding to the metatarsophalangeal joint is located at the junction of the region 11 corresponding to the phalanges and the region 13 corresponding to the metatarsals, and partially overlaps with both.

[0068] The area of ​​the plate 1 corresponding to the forefoot is the area that overlaps with the wearer's forefoot in the thickness direction of the plate 1. Correspondingly, the areas 11 corresponding to the phalanges, 12 corresponding to the metatarsophalangeal joints, 13 corresponding to the metatarsals, 14 corresponding to the midfoot, and 15 corresponding to the hindfoot are the areas that overlap with the wearer's phalanges, metatarsophalangeal joints, metatarsals, midfoot, and hindfoot, respectively.

[0069] In this embodiment, the plate 1 is recessed downwards in the region 12 corresponding to the metatarsophalangeal joint of the foot to form a concave structure 2. The cross-section of the concave structure 2 in the foot width direction includes an arch shape with the arch facing upwards.

[0070] Figure 5 This is a cross-sectional view of the area 12 of the plate body corresponding to the metatarsophalangeal joint in the foot width direction. The dotted lines represent the five metatarsal bones of the foot. The forefoot transverse arch is formed by the heads of the first to fifth metatarsal bones. Under non-weight-bearing conditions, the first and fifth metatarsal heads are in contact with the ground through soft tissue, while the second to fourth metatarsal heads are off the ground, with the second metatarsal head being the highest. The center line shows the shape of the forefoot transverse arch, which is an arch with the arch opening facing downwards in the foot width direction. The concave structure 2 of this invention has its arch opening facing upwards, opposite to the forefoot transverse arch. During movement, the forefoot transverse arch is compressed downwards by the force applied by body weight and push-off. The concave structure 2 deforms and compresses synchronously, absorbing and dispersing the applied force, thus achieving the effect of supporting the forefoot transverse arch, cushioning, and reducing the pressure on the forefoot transverse arch.

[0071] Reference Figure 9In the diagram, the convex arc represents the transverse arch of the forefoot, and the concave arc represents concave structure 2. During movement, after the forefoot lands, it begins to compress concave structure 2. At maximum pressure, concave structure 2 deforms to its maximum, and a portion of the ground reaction force is converted into elastic potential energy. As the forefoot begins to push off the ground, the pressure applied to concave structure 2 gradually decreases, and concave structure 2 gradually returns to its original shape, releasing its stored elastic potential energy and providing feedback to the foot. When the toes leave the ground, concave structure 2 returns to its original shape. It can be understood that as long as the inner and outer sides of concave structure 2 (i.e., the first toe side and the fifth toe side) are first contacted and pressed down, the energy feedback rate can be improved. Therefore, provided that the middle of concave structure 2 is lower than the sides, the cross-section of concave structure 2 in the foot width direction can also include two or more arches, such as... Figure 10 and Figure 11 As shown.

[0072] It can be seen that by deforming the concave structure 2 in the vertical direction (that is, the thickness direction), additional rebound feedback can be generated, realizing the utilization of energy at the metatarsophalangeal joint, improving the energy release in the forefoot transverse arch area, and improving the overall feedback efficiency of the sole.

[0073] In addition, the plate of this utility model also has the following technical effects:

[0074] 1. Dynamic fit for improved comfort: The force feedback function senses the pressure distribution during foot movement and dynamically adjusts the support and cushioning of the sole, making the shoe fit the foot shape better and reducing friction and discomfort.

[0075] 2. Reduce sports injuries: Force feedback function can monitor and adjust the sole's absorption and rebound of impact in real time, reducing excessive load on joints and muscles and lowering the risk of sports injuries.

[0076] 3. Optimize gait: By providing feedback on foot pressure distribution, it helps correct poor gait, such as inversion or supination, promotes a natural gait, and reduces the negative impact of long-term exercise on the body.

[0077] 4. Improve exercise efficiency: Good force feedback can effectively store and release energy, reduce energy loss, improve athletic performance, and reduce fatigue.

[0078] 5. Prevention of chronic injuries: By continuously optimizing gait and reducing impact, force feedback helps prevent chronic injuries caused by improper long-term exercise, such as plantar fasciitis and knee arthritis.

[0079] 6. Promotes recovery: Some force feedback systems can also provide massage or micro-vibration after exercise, promoting blood circulation and accelerating muscle recovery.

[0080] The force feedback function of the plate not only improves the comfort of athletic shoes, but also significantly improves athletic health by optimizing gait, reducing injury, and increasing efficiency.

[0081] The specific extent of the concave structure 2 can be adjusted according to actual needs. For example, the concave structure 2 can extend forward to partially / completely cover the area 11 of the plate body 1 corresponding to the metatarsal bones of the foot, and extend backward to partially / completely cover the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot. Figure 12 and Figure 13 As shown, the concave structure 2 of the plate 1 extends forward to partially cover the area 11 corresponding to the metatarsal bones of the foot, and extends backward to completely cover the area 13 corresponding to the metatarsal bones of the foot. Expanding the front and rear coverage of the concave structure 2 can increase the force-bearing area of ​​the plate 1, improve energy storage, and further enhance energy release in the forefoot transverse arch area. On the other hand, it can improve the comfort of movement.

[0082] Reference Figures 1 to 8 In this embodiment, the concave structure 2 completely covers the area 11 of the plate body 1 corresponding to the metatarsal bones of the foot in the forward direction, and completely covers the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot in the rear direction. That is, the concave structure 2 in this embodiment is formed by the entire area of ​​the plate body 1 corresponding to the forefoot being concave downward.

[0083] Combination Figures 2-8 In this embodiment, the curvature of the concave structure 2 gradually decreases from the middle part forward and also gradually decreases from the middle part backward, so that the cross-section of the concave structure 2 in the foot length direction is a downward concave arc or bow shape, which is beneficial to improve the deformation capacity of the concave structure 2, increase the lever arm effect on the metatarsophalangeal joint, and match the gait, improving the smoothness, comfort and efficiency of running or walking.

[0084] like Figure 2 and Figure 8 As shown, in this embodiment, the area 11 of the plate body 1 corresponding to the phalanges of the foot curves forward along the length of the foot, which helps to improve the wearer's phalangeal extension force, increase propulsion, reduce energy loss, and achieve better push-off efficiency. The forward curve of the area 11 of the plate body 1 corresponding to the phalanges of the foot, combined with the concave shape of the concave structure 2 in the length of the foot, makes the bottom of the plate roughly shovel-shaped in the length of the foot. This reduces the bending of the metatarsophalangeal joints in the length of the foot, thereby reducing kinetic energy loss, increasing push-off momentum, increasing forward propulsion, and ensuring stability and efficiency in the transition from landing to push-off.

[0085] In other preferred embodiments of this utility model, the region 11 of the plate body 1 corresponding to the toe bones of the foot may also be parallel to the horizontal plane.

[0086] Reference Figure 6The concave structure 2 in this embodiment includes a concave portion 21 located in the middle in the foot width direction and wing support portions 22 extending outward from the inner and outer sides of the concave portion 21, respectively. The wing support portions can increase the contact area (not direct contact) between the concave structure 2 and the foot, providing a certain support and improving the comfort of stepping on the foot. On the other hand, they can ensure that the concave structure 2 can expand outward when deformed under pressure, ensuring the effectiveness of the elastic potential energy stored by the concave structure 2 under pressure deformation.

[0087] The concave portion 21 smoothly transitions to the inner and outer wing support portions 22 on both sides to reduce stress concentration at the connection between the concave portion 21 and the wing support portions 22, thereby enhancing the structural strength of the concave structure 2. The wing support portions 22 may extend outward from their connection with the concave portion 21 in an arc or a straight line. Preferably, the wing support portions 22 gradually taper outward to be parallel to the horizontal plane or slightly upturned relative to the horizontal plane to improve wearing comfort.

[0088] In this embodiment, the width L of the recessed portion 21 accounts for 45% to 90% of the width S of the recessed structure 2, preferably 50% to 70%.

[0089] With the concave depth of the concave structure 2 remaining constant, the smaller the L / S ratio, the steeper the curvature of the concave structure 2, the stronger its stiffness, and the smaller the deformation under the same pressure. This design is suitable for people with greater impact, such as adults. Conversely, the larger the L / S ratio, the gentler the curvature of the concave structure 2, the smaller its stiffness, and the greater the deformation under the same pressure. This design is suitable for people with less impact, such as children.

[0090] It is understood that in other preferred embodiments of this utility model, the recessed structure 2 may also omit the wing support portion 22.

[0091] Example 2

[0092] Reference Figure 14 and Figure 15 This embodiment is an improvement on the first embodiment. In this embodiment, two stress relief grooves 3 are provided in the area of ​​the forefoot corresponding to the plate 1. The two stress relief grooves 3 are located on the inner and outer sides of the area 13 of the metatarsal bone of the foot corresponding to the plate 1, respectively. The stress relief grooves 3 extend inward from the edge of the plate 1.

[0093] The number and location of stress relief grooves 3 can be adjusted according to actual needs, such as... Figure 16 As shown, four stress relief grooves 3 are provided in the area of ​​the forefoot corresponding to the plate 1, such as... Figure 17 As shown, the stress relief groove 3 is located in the middle of plate 1, as... Figure 18As shown, the stress relief groove 3 is provided in the region 12 of the plate body 1 corresponding to the metatarsophalangeal joint of the foot. Of course, the stress relief groove 3 can also be provided at the junction of the region 12 of the plate body 1 corresponding to the metatarsophalangeal joint of the foot and the region 13 corresponding to the metatarsal bone of the foot, or it can traverse the two regions mentioned above, such as extending inward from the edge of the region 13 of the plate body 1 corresponding to the metatarsal bone of the foot to the region 12 corresponding to the metatarsophalangeal joint of the foot.

[0094] The stress relief groove 3 can interrupt the overall force transmission of the plate when the foot lands. On the one hand, it concentrates the force on the metatarsophalangeal joint of the forefoot and compresses the plate to produce deformation. On the other hand, it can maintain the flexible bending performance of the sole and improve the comfort of wearing the shoe.

[0095] To balance the overall rigidity and deformation capacity of the plate 1, the depth b of the stress relief groove 3 extending inward in the foot width direction (which is the orthographic projection of the stress relief groove 3 in the foot width direction) is preferably one-third of the width c of the plate 1.

[0096] The shape of the stress relief groove 3 is not limited, such as the straight shape in this embodiment. Figure 18 The V-shape shown Figure 19 The arc shape shown is an example.

[0097] The width d of the stress relief groove 3 is preferably 1 to 5 mm.

[0098] Example 3

[0099] This embodiment limits the thickness of plate 1 based on embodiment 1. Specifically, as follows... Figure 20 As shown, the thickness e of the recessed structure 2 is greater than the thickness of other parts of the plate 1.

[0100] Increasing the thickness of the concave structure 2 can enhance its rigidity and stress, enabling it to store more elastic potential energy.

[0101] The thickness of the recessed structure 2 can be selected from 1.0 to 1.8 mm, preferably 1.0 to 1.5 mm.

[0102] The thickness of plate 1 at various points can be set according to the following scheme, along the length direction:

[0103] ① Front end of plate 1: 1.0mm, deepest part of recessed structure 2: 1.2mm, rear end of plate 1: 0.8~1.0mm;

[0104] ② Front end of plate 1: 1.5mm, deepest part of recessed structure 2: 1.8mm, rear end of plate 1: 1.2mm;

[0105] ③ The front end of plate 1 is 1.2mm, the deepest part of the recessed structure 2 is 1.5mm, and the rear part is 1.0mm.

[0106] Reference Figure 21 , Figure 21 This is a cross-sectional view of the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot in the foot width direction. The dotted lines represent the five metatarsal bones of the foot, arranged from right to left, from the first to the fifth metatarsal bones. The forefoot transverse arch is formed by the heads of the first to fifth metatarsal bones. In the forefoot transverse arch, the first and fifth metatarsal heads are in contact with the ground through soft tissue, while the second to fourth metatarsal heads are off the ground, with the second metatarsal head being the highest. The deepest part of the concave structure 2 in this embodiment corresponds to the area of ​​the second and third metatarsal bones. When the concave structure 2 is subjected to external force, the deepest part is often the area of ​​stress concentration. Increasing the thickness of this area can enhance the overall structural strength of the concave structure 2, enabling it to withstand greater pressure, thereby improving the service life and safety of the plate. Increasing the thickness of the deepest part of the concave structure 2 allows this area to better store energy when subjected to force and release this energy rapidly when pushing off the ground, thereby improving the energy release in the forefoot transverse arch area. Therefore, the region 16 corresponding to the second to third metatarsal bones of the foot in the concave structure 2 is the thickest.

[0107] The thickness 'e' of the concave structure 2 gradually decreases from the second metatarsal bone towards the first metatarsal bone, and gradually decreases from the third metatarsal bone towards the fifth metatarsal bone. When the concave structure 2 is compressed, the stress in the foot width direction is distributed along the arc-shaped cross-section of the concave structure 2. The gradual decrease in thickness from the deepest point of the concave structure 2 towards both the inner and outer sides optimizes the stress distribution, making the overall structure of the concave structure 2 more rational and efficient. The design of the concave structure 2 gradually decreasing in thickness from the deepest point towards both the inner and outer sides also improves the rebound performance. The inner and outer sides of the concave structure 2 can rebound better, release the stored energy, and transfer the energy more effectively to the foot, improving the foot's rebound feedback.

[0108] Furthermore, gradually decreasing the thickness from the deepest point towards both sides can reduce the overall weight of the plate while maintaining the strength and stability of the recessed structure 2.

[0109] Example 4

[0110] Figure 22 The sole of the left foot is shown, while the sole of the right foot is symmetrical to it. The sole of the right foot is not shown.

[0111] like Figures 22-24 As shown, the sole of this embodiment includes a midsole 4 and a plate embedded in the midsole 4. The plate is any one of the plates described in embodiments one to three above. The concave structure 2 of the plate can store elastic potential energy by compressing and deforming the transverse arch of the forefoot after the forefoot touches the ground and before it leaves the ground. During the process of leaving the ground, it releases the stored elastic potential energy, providing rebound force feedback to the foot, realizing the utilization of energy at the metatarsophalangeal joint, improving the energy release in the transverse arch area of ​​the forefoot, and improving the overall force feedback efficiency of the sole.

[0112] The sole of this embodiment can be manufactured using a conventional "sandwich" midsole process. In this process, the midsole 4 includes an upper midsole 4, a plate, and a lower midsole 4. The lower surface of the upper midsole 4 is shaped to match the upper surface of the plate, and the upper surface of the lower midsole 4 is shaped to match the lower surface of the plate. The upper midsole 4, plate, and lower midsole 4 are bonded together with adhesive. Alternatively, a one-piece midsole process can be used, where the plate is directly "glued" together during the foaming process of the midsole 4. This reduces the impact of adhesive on the material properties of the midsole 4 in the conventional "sandwich" midsole 4 process, thus improving the overall performance and stability of the sole.

[0113] Midsole 4 materials are diverse. Currently, common midsole 4 materials on the market include EVA (ethylene vinyl acetate), TPU (thermoplastic polyurethane), and PEBA (polyether block amide). The performance of midsole 4 depends not only on the material itself but also on the foaming process, such as supercritical foaming. The foaming process uses chemical reactions or physical methods to create tiny pores inside the material, thereby improving the material's resilience and cushioning effect, and enhancing the overall performance of the sole.

[0114] The ratio of the depth of the concave structure 2 of the plate to the thickness of the midsole 4 has a significant impact on the performance of the sole and the wearing experience. If the depth of the concave structure 2 is too deep and the midsole 4 is too thin, it may lead to excessive impact and discomfort on the foot; conversely, if the midsole 4 is too thick and the depth of the concave structure 3 is too shallow, it may weaken the shoe's support and stability. The depth of the concave structure 2 of the plate and the thickness of the midsole 4 need to work synergistically to fully utilize the performance of the plate and midsole 4 materials.

[0115] Reference Figure 23 In this embodiment, the maximum depth h of the concave structure 2 accounts for 38% to 86% of the thickness a of the midsole 4. A reasonable ratio between the depth of the concave portion 2 and the thickness of the midsole 4 allows the sole to provide sufficient support and stability while maintaining lightness and flexibility, ensuring that the rebound performance of the plate is fully utilized, thereby improving running efficiency and speed.

[0116] The maximum depth h of the recessed structure 2 is 10–30 mm. The thickness a of the midsole 4 is 13–35 mm, preferably 18–35 mm.

[0117] Furthermore, the placement of the plate also significantly impacts the performance and comfort of the sole. If the gap between the concave structure 2 and the upper surface of the midsole 4 is too large, it will weaken the deformation capability of the concave structure 2, and the rebound force from the plate may be absorbed by the upper midsole, thus reducing its rebound performance. If the gap between the concave structure 2 and the upper surface of the midsole 4 is too small, it may not provide sufficient cushioning, and the hard texture of the plate may be directly transmitted to the sole of the foot, resulting in poor wearing comfort.

[0118] The moderate spacing between the concave structure 2 and the upper surface of the midsole 4 ensures that the plate rebounds fully when bent, while providing sufficient cushioning to reduce the impact on the feet during exercise and improve the comfort of exercise.

[0119] The distance between the concave structure 2 and the upper surface of the midsole 4 is 7% to 30% of the midsole thickness, and the distance between the concave structure 2 and the lower surface of the midsole 4 is 7% to 30% of the midsole thickness. This ratio ensures full utilization of the plate's rebound performance without excessively restricting the cushioning and rebound performance of the midsole, as well as the comfort of the shoe. Preferably, the concave structure 2 is centered in the thickness direction of the midsole 4 to help disperse the impact force generated during exercise, reduce the wear and tear on the midsole 4 material, and thus extend the shoe's lifespan.

[0120] The performance of the sole in this embodiment was tested, and the shape of the test plate was the same as that of the sole. Figure 12 As shown, the thickness of the recessed structure is the same as the thickness of other parts of the plate:

[0121] Functional verification metrics: Assuming other factors remain constant, the mechanical propulsion performance of the sole is evaluated by measuring the support time and airtime during movement while wearing the sole. Generally, at the same speed, a shorter support time and less active force exertion indicate greater energy efficiency. Better mechanical propulsion performance results in a faster stride frequency and a longer stride length.

[0122] The support time is the time from when the foot touches the ground to when the toes leave the ground, and the air time is the time from when the toes leave the ground to when the other foot touches the ground. Both support time and air time are measured in milliseconds.

[0123] The experimental data are as follows:

[0124] Experimental Example 1: h=13mm, a=17mm.

[0125]

[0126] Experimental Example 2: h=5mm, a=13mm.

[0127]

[0128] Experimental Example 3: h=30mm, a=35mm.

[0129]

[0130] Example 5

[0131] The shoe of this embodiment has the sole of Embodiment Four, which has the same advantages as described above. The shoe can be used for running, skipping rope, basketball, etc., regardless of its intended use.

[0132] The shoe in this embodiment is used as an experimental example (the width S of the concave structure 2 is 100mm, the maximum depth h is 13mm, the width L of the concave portion 21 is 55mm, and the thickness a of the midsole 4 is 17mm; the shape of the test plate is the same). Figure 12 As shown, the thickness of the concave structure is consistent with the thickness of other parts of the plate. A regular flat carbon fiber skateboard shoe (without the concave structure 2 in area 12 corresponding to the metatarsophalangeal joint) was used as a control example. Various sports tests were conducted on the experimental example and the control example. The test results are as follows:

[0133] (1) Running

[0134] Data was collected from 16 people, and the average value of the 16 people was taken. Based on a running speed of 20km / h, the total marathon time was reduced by 167.117s.

[0135] The calculation is based on the following:

[0136]

[0137] The experimental data for the experimental and control cases at different running speeds are as follows:

[0138]

[0139] Figures 25-27 For the charts corresponding to the table above, please refer to the table above and... Figure 25 At a moderate speed, the experimental case showed a single-step length 2 cm (0.76%) longer than the control case, as shown in the table above. Figure 26 At high speeds, the single-step time decreased by 0.005s (1.62%), as shown in the table above. Figure 27 As running speed increased, the proportion of the support phase decreased and the proportion of the airborne phase increased, indicating that the test subjects had a faster stride frequency, longer stride length, and took less time to cover the same distance, demonstrating stronger propulsion performance.

[0140] (2) Basketball

[0141] A vertical jump test was conducted, and the experimental group showed a 2cm increase in single-leg jump and a 4cm increase in double-leg jump compared to the control group.

[0142] (3) Long jump

[0143] The participants wore the shoes of the experimental and control examples and performed a standing long jump test. The dorsiflexion angle of the metatarsophalangeal joint was collected. The larger the dorsiflexion angle, the more negative work was done, indicating greater energy loss; the smaller the dorsiflexion angle, the less negative work was done, indicating less energy loss, indicating more effective use of the impact force.

[0144] The test results showed that the experimental case had a dorsiflexion angle of 13.4°, while the control case had a dorsiflexion angle of 18.6°. This means that the experimental case could save 27.9% of energy.

[0145] Data was collected using the Vicon data acquisition system, and the experimental group's long jump performance improved by 5 cm compared to the control group.

[0146] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims are within the scope of protection of the present invention.

Claims

1. A plate for shoe soles, characterized in that, The plate (1) is recessed downward in the area (12) of the metatarsophalangeal joint of the foot to form a concave structure (2). The cross section of the concave structure (2) in the foot width direction includes at least one arch with the arch facing upward. At least one stress relief groove (3) is provided in the area of ​​the forefoot of the plate (1).

2. The plate for shoe soles according to claim 1, characterized in that, The plate (1) has at least one stress relief groove (3) on the inner side of the area corresponding to the forefoot, and / or the plate (1) has at least one stress relief groove (3) on the outer side of the area corresponding to the forefoot, and the stress relief groove (3) extends inward from the edge of the plate (1).

3. The plate for shoe soles according to claim 2, characterized in that, The stress relief groove (3) extends inward in the foot width direction to a depth of one-third of the width of the plate (1).

4. The plate for shoe soles according to claim 1, characterized in that, The stress relief groove (3) is located in the area (12) of the plate (1) corresponding to the metatarsophalangeal joint of the foot and / or the area (13) corresponding to the metatarsal bones of the foot.

5. The plate for shoe soles according to claim 1, characterized in that, The stress relief groove (3) is straight, V-shaped, or arc-shaped; the width of the stress relief groove (3) is 1-5 mm.

6. The plate for shoe soles according to claim 1, characterized in that, The curvature of the concave structure (2) gradually decreases from its middle part forward and / or from its middle part backward.

7. The plate for shoe soles according to claim 1, characterized in that, The concave structure (2) extends forward to completely or partially cover the area (11) of the plate (1) corresponding to the metatarsal bones of the foot, and / or the concave structure (2) extends backward to completely or partially cover the area (13) of the plate (1) corresponding to the metatarsal bones of the foot.

8. The plate for shoe soles according to claim 1, characterized in that, The plate (1) is raised forward along the length of the foot in the area (11) corresponding to the toe bones of the foot.

9. A shoe sole, characterized in that, A plate for shoe sole as described in any one of claims 1 to 8.

10. A shoe, characterized in that, The shoe has the sole as described in claim 9.

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