Method for improving sole force feedback efficiency

Abstract

The invention discloses a method for improving sole force feedback efficiency, which is characterized in that a plate is arranged in a midsole of a sole, the plate comprises a plate body, an area of the plate body corresponding to a foot metatarsophalangeal joint is sunken downwards to form a sunken structure, and the section of the sunken structure in the foot width direction at least comprises an arch with an upward arch opening. The downward-concave structure can be compressed and deformed along with the transverse arch of the forefoot and store elastic potential energy after the forefoot touches the ground and before the forefoot pedals away from the ground, and in the process of stepping away from the ground, the stored elastic potential energy is released, and resilience force feedback is provided for the foot. According to the method for improving the force feedback efficiency of the shoe sole, energy at the metatarsophalangeal joints is utilized, energy release of a forefoot transverse arch area is improved, and the overall force feedback efficiency of the shoe sole is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of footwear products, and in particular to a method for improving the force feedback efficiency of a shoe sole. Background Art

[0002] In order to improve the overall performance of sports shoes, a special plate is usually cleverly embedded in the sole. There are various types of plates, such as carbon plates, thermoplastic polyurethane (TPU) plates, nylon plates, etc. The main function of this plate is to improve the support and stability of the sole, disperse the pressure and impact during exercise, reduce the deformation and wear of the sole, and also improve the comfort and support of the sole. In addition, the elasticity and toughness of the plate can help athletes better control the direction and strength of movement, and can also improve the stability, reaction speed and sense of balance of movement, so as to achieve better performance in sports competitions.

[0003] At present, this kind of special board generally adopts a flat plate structure, such as a flat carbon board. Although the flat carbon board can provide certain support and stability, it has limited performance in energy feedback. It cannot effectively capture and transform the reaction force from the ground, resulting in less energy fed back to the wearer and poor performance in force feedback efficiency. In view of this, this case was created. Summary of the invention

[0004] In response to the above problems, one of the objects of the present invention is to provide a plate, a sole and a shoe for the sole, so as to improve the force feedback efficiency during exercise by enhancing the energy release in the transverse arch area of ​​the forefoot; the second object of the present invention is to provide a method for improving the force feedback efficiency of the sole.

[0005] In order to achieve the above object, the technical solution proposed by the present invention is: The present invention discloses a plate for a shoe sole, which comprises a plate body with a 3D structure. The plate body is concave downward in an area corresponding to a metatarsophalangeal joint of a foot to form a concave structure. The cross section of the concave structure in the direction of foot width comprises at least one arch with an arch opening facing upward.

[0006] Preferably, the curvature of the concave structure gradually decreases from the middle to the front, and / or from the middle to the back, so that the cross-section of the concave structure in the direction of the length of the foot is an arc or bow shape that is concave downward, which can store energy and release it when the foot swings forward, thereby pushing the wearer forward and providing better propulsion during the extension phase. In addition, it can better guide the mechanical transmission of the foot, so that the wearer can exert force more smoothly during exercise, which is conducive to reducing energy loss and improving exercise efficiency.

[0007] Preferably, the area of ​​the plate corresponding to the phalanges of the foot is tilted forward along the length of the foot, which helps to improve the wearer's phalanges' pushing and extending force, increase propulsion force, reduce energy loss, and achieve better pushing and extending efficiency.

[0008] Preferably, the concave structure extends forward to completely or partially cover the area of ​​the board body corresponding to the phalanges of the foot, and / or the concave structure extends backward to completely or partially cover the area of ​​the board body 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 board body and increase the energy storage to further enhance the energy release in the forefoot transverse arch area, and on the other hand, improve the comfort of exercise.

[0009] As an improvement of the present invention, the concave structure includes a concave portion and wing support portions extending outward from the inner and outer sides of the concave portion. The wing support portions can increase the contact area between the concave structure and the foot (non-direct contact), play a certain supporting role, and improve the comfort of foot stepping. On the other hand, they can ensure that the concave structure can be expanded outward when it is compressed and deformed, thereby ensuring the effectiveness of storing elastic potential energy of the concave structure when it is compressed and deformed.

[0010] Preferably, the wing support portion gradually transitions outwards to be straight from the connection between the wing support portion and the concave portion.

[0011] Preferably, the width of the concave portion accounts for 45% to 90% of the width of the concave structure.

[0012] As an improvement of the present invention, at least one stress release groove is provided in the area of ​​the plate corresponding to the forefoot of the foot.

[0013] Preferably, at least one stress relief groove is provided on the inner side of the plate body corresponding to the forefoot of the foot, and / or at least one stress relief groove is provided on the outer side of the plate body corresponding to the forefoot of the foot.

[0014] Preferably, the stress release groove is extended inward from the edge of the plate body.

[0015] Preferably, the depth of the stress release groove extending inwardly in the foot width direction accounts for one third of the width of the board body, so as to balance the overall rigidity and deformation capacity of the board body.

[0016] Preferably, the stress release groove is located in a region of the plate corresponding to a metatarsophalangeal joint of the foot and / or a region corresponding to a metatarsal bone of the foot.

[0017] Preferably, the stress release groove is linear, V-shaped or arc-shaped.

[0018] Preferably, the width of the stress release groove is 1 to 5 mm.

[0019] As an improvement of the present invention, the thickness of the concave structure is greater than the thickness of other parts of the plate body.

[0020] Preferably, the concave structure is thickest in the area corresponding to the second metatarsal bone to the third metatarsal bone of the foot, so that the concave structure can withstand greater pressure, thereby improving the service life and safety of the board.

[0021] Preferably, the thickness of the concave structure gradually decreases from the second metatarsal to the first metatarsal, and gradually decreases from the third metatarsal to the fifth metatarsal, so as to optimize the distribution of stress, make the overall structure of the concave structure more reasonable and efficient, and reduce the overall weight of the board while maintaining the strength and stability of the concave structure.

[0022] Preferably, the thickness of the concave structure may be 1.0 to 1.8 mm, preferably 1.0 to 1.5 mm.

[0023] The invention also discloses a shoe sole adopting the plate, wherein the shoe sole comprises a midsole and the plate embedded in the midsole.

[0024] Furthermore, the maximum depth of the concave structure accounts for 38% to 86% of the thickness of the midsole.

[0025] Furthermore, the maximum depth of the concave structure is between 10 and 30 mm, and the thickness of the midsole is between 13 and 35 mm.

[0026] Furthermore, the distance between the concave structure and the upper surface of the midsole accounts for 7% to 30% of the thickness of the midsole, and the distance between the concave structure and the lower surface of the midsole accounts for 7% to 30% of the thickness of the midsole. While ensuring full use of the rebound performance of the board, it will not excessively limit the cushioning and rebound performance of the midsole, as well as the comfort of the sole.

[0027] The invention also discloses a pair of shoes using the sole.

[0028] The present invention discloses a method for improving the force feedback efficiency of the sole by using the above-mentioned plate. The above-mentioned plate is arranged on the sole, and the concave structure of the plate can be compressed and deformed with the transverse arch of the forefoot after the forefoot touches the ground and before it pushes off the ground, thereby storing elastic potential energy. In the process of pushing off the ground, the stored elastic potential energy is released to provide resilience feedback to the foot.

[0029] By adopting the above technical solution, the beneficial effects of the present invention are as follows: (1) The plate body of the present invention is at least concave in the area corresponding to the metatarsophalangeal joint of the foot to form a concave structure, and the arch mouth of the concave structure faces upward, opposite to the transverse arch of the forefoot with the arch mouth facing downward. During exercise, the transverse arch of the forefoot is compressed downward by the body weight and the force applied by pushing and stretching. The concave structure can deform and compress synchronously to absorb and disperse the applied force, thereby achieving the effect of supporting the transverse arch of the forefoot, absorbing shock, and reducing the pressure on the transverse arch of the forefoot. At the same time, through the deformation of the concave structure in the vertical direction (that is, the thickness direction), additional rebound feedback can be generated, thereby realizing the utilization of energy at the metatarsophalangeal joint, enhancing the energy release in the forefoot transverse arch area, and improving the overall force feedback efficiency of the sole.

[0030] (2) The board body of the present invention is provided with a stress release groove, which can cut off the force transmission of the entire board when the foot lands on the ground. On the one hand, it concentrates the force on the metatarsophalangeal joint of the forefoot and compresses the board to produce deformation. On the other hand, it can maintain the flexible bending performance of the sole and improve the wearing comfort of the shoe.

[0031] (3) The thickness of the concave structure of the present invention is greater than the thickness of other parts of the plate body. Increasing the thickness of the concave structure can enhance the rigidity of the concave structure, enhance 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 durability of the structure.

[0032] (4) In the sole of the present invention, 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, ensuring that the rebound performance of the board can be fully utilized, thereby improving running efficiency and speed.

[0033] (5) The present invention arranges a plate inside the midsole of the sole. The concave structure of the plate can be compressed and deformed with the transverse arch of the forefoot after the forefoot touches the ground and before it pushes off the ground, thereby storing elastic potential energy. During the process of pushing off the ground, the elastic potential energy stored in the plate is released to provide rebound force feedback to the foot, thereby realizing the utilization of energy at the metatarsophalangeal joint, enhancing the energy release in the transverse arch area of ​​the forefoot, and improving the overall force feedback efficiency of the sole. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the plate of Example 1.

[0035] Figure 2 for Figure 1 Schematic side view of .

[0036] Figure 3 for Figure 1 Schematic top view of .

[0037] Figure 4 for Figure 3 AA section diagram.

[0038] Figure 5 for Figure 3 Schematic diagram of the BB cross-section.

[0039] Figure 6 for Figure 3 Schematic diagram of CC section view.

[0040] Figure 7 for Figure 3 DD cross-sectional view diagram.

[0041] Figure 8 for Figure 3 EE cross-sectional view diagram.

[0042] Fig. 9 This is a simplified diagram illustrating the principle of the board of Example 1.

[0043] Fig.10 It is a schematic diagram of the three-dimensional structure of a plate according to another preferred embodiment of the present invention.

[0044] Fig.11 for Fig.10 AA section diagram.

[0045] Fig.12 It is a schematic diagram of the three-dimensional structure of a plate according to another preferred embodiment of the present invention.

[0046] Fig.13 for Fig.12 Schematic side view of .

[0047] Fig.14 It is a schematic diagram of the three-dimensional structure of the plate of the second embodiment.

[0048] Fig.15 for Fig.14 Schematic top view of .

[0049] Figure 16 to Figure 19 It is a schematic top view of a plate according to another preferred embodiment of the present invention.

[0050] Fig. 20 It is a schematic cross-sectional view of the plate of Example 3 in the direction of the foot length.

[0051] Fig.21 Schematic cross-sectional view of the area of ​​the plate body corresponding to the metatarsal bones of the foot in the width direction of the foot in Example 3.

[0052] Fig. 22 It is a top view schematic diagram of the midsole of the fourth embodiment.

[0053] Fig.23 for Fig. 22 AA section diagram.

[0054] Fig.24 for Fig. 22 Schematic diagram of the BB cross-section.

[0055] Fig.25 It is a clustered column chart of the single-step lengths of the experimental example and the control example of Example 5.

[0056] Fig.26 It is a clustered bar chart of the single-step time of the experimental example and the control example of Example 5.

[0057] Fig. 27 It is a stacked bar chart of the proportion of support time and air time of the experimental example and the control example of Example 5.

[0058] Among them: 1. Plate body; 11. Area corresponding to the toes of the foot; 12. Area corresponding to the metatarsophalangeal joints of the foot; 13. Area corresponding to the metatarsal bones of the foot; 14. Area corresponding to the midfoot of the foot; 15. Area corresponding to the hindfoot of the foot; 2. Concave structure; 21. Concave part; 22. Wing support part; 3. Stress relief groove; 4. Midsole. DETAILED DESCRIPTION

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0060] In the following description, terms indicating directions such as foot length direction, foot width direction, front, back, medial side, and lateral side are observed from the wearer's perspective. For example, front refers to the toe direction, back refers to the heel direction, medial side refers to the inner side of the foot in the foot width direction (the first toe side of the foot), and lateral side refers to the outer side of the foot in the foot width direction (the fifth toe side of the foot).

[0061] The foot consists of the forefoot, midfoot and hindfoot. According to the functional anatomical analysis of the foot during movement, the forefoot consists of two important structures of the foot: the transverse arch of the forefoot and the metatarsophalangeal joint. The transverse arch of the forefoot is composed of the first to fifth metatarsal heads. In walking, running, jumping and changing direction, the transverse arch of the forefoot is an important load-bearing area and force transmission area of ​​the human body. The metatarsophalangeal joint is composed of five metatarsal heads and the base of the phalanges of their proximal segments. For foot flexion movements such as running and jumping that quickly push off the ground, the movement must eventually occur at the metatarsophalangeal joint. According to relevant research results, during the braking phase of the movement, the transverse arch of the forefoot bears and absorbs the impact of the ground reaction force; during the extension phase of the movement, the force generated by the hip, knee and ankle can be transmitted from the hindfoot to the transverse arch area of ​​the forefoot and released in this area, prompting the body to push off the ground.

[0062] Most of the existing soles only focus on the support stability performance of the soles and the force of the soles, and there are few studies on the technology of utilizing the energy at the metatarsophalangeal joints through the materials and structures of sports shoes to enhance the energy release of the forefoot transverse arch. The present invention studies this and obtains a plate, a sole and a shoe that utilizes the energy at the metatarsophalangeal joints of the foot to enhance the energy release of the forefoot transverse arch, as well as a method for improving the force feedback efficiency of the soles.

[0063] Embodiment 1 Figure 1 The plate for the left foot is shown, and the plate for the right foot is symmetrical with the left and right thereof, and the plate for the right foot is not shown.

[0064] The board can be made of fiber reinforced resin, such as T700 carbon board and T800 carbon board. Fibers used for fiber reinforced resin include carbon fiber, glass fiber, aromatic polyamide fiber, ultra-high molecular weight polyethylene fiber, modified polyphenylene ether fiber, boron fiber, etc.

[0065] like Figure 3 The figure shows the positional relationship between the plate of this embodiment and the foot of the wearer. The plate of this embodiment is a full-palm plate. In other embodiments, it can also be a partial carbon plate or a half-palm carbon plate that only covers the metatarsophalangeal joint. In this embodiment, the plate covers the entire sole from the toe to the heel, and includes a plate body 1 with a 3D structure. The plate body 1 has an area corresponding to the forefoot of the foot, an area 14 corresponding to the midfoot of the foot, and an area 15 corresponding to the hindfoot of the foot, wherein the area corresponding to the forefoot of the foot is divided into an area 11 corresponding to the phalanges of the foot and an area 13 corresponding to the metatarsal bones of the foot. Because the metatarsophalangeal joint is composed of the metatarsal head and the base of the phalanges of the proximal segment thereof, the area 12 of the plate body 1 corresponding to the metatarsophalangeal joint of the foot is located at the junction of the area 11 corresponding to the phalanges of the foot and the area 13 corresponding to the metatarsal bones of the foot and partially overlaps with the two.

[0066] The area of ​​the plate body 1 corresponding to the forefoot of the foot is the area that overlaps with the forefoot of the wearer in the thickness direction of the plate body 1. Correspondingly, the area 11 of the plate body 1 corresponding to the phalanges of the foot, the area 12 corresponding to the metatarsophalangeal joints of the foot, the area 13 corresponding to the metatarsal bones of the foot, the area 14 corresponding to the midfoot of the foot and the area 15 corresponding to the hindfoot of the foot are the areas that overlap with the phalanges, metatarsophalangeal joints, metatarsal bones, midfoot and hindfoot of the wearer respectively.

[0067] The plate body 1 of this embodiment is concave downward in the area 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 width direction of the foot includes an arch shape with the arch opening facing upward.

[0068] Figure 5It is a schematic cross-sectional view of the area 12 of the plate body 1 corresponding to the metatarsophalangeal joint of the foot in the width direction of the foot. The dotted line part is the five metatarsal bones of the foot. The transverse arch of the forefoot is composed of the first to fifth metatarsal heads. In the non-weight-bearing condition, the first and fifth metatarsal heads are in contact with the ground through soft tissues, while the second to fourth metatarsal heads are off the ground, and the second metatarsal head is the highest from the ground. The center line shows the shape of the transverse arch of the forefoot. The transverse arch of the forefoot is in the shape of an arch with the mouth facing downward in the width direction of the foot, while the concave structure 2 of the present invention has the mouth facing upward, opposite to the transverse arch of the forefoot. During exercise, the transverse arch of the forefoot is compressed downward by the body weight and the force applied by pushing and stretching, and the concave structure 2 is deformed and compressed synchronously to absorb and disperse the applied force, thereby achieving the effect of supporting the transverse arch of the forefoot, absorbing shock, and reducing the pressure on the transverse arch of the forefoot.

[0069] Reference Fig. 9 In the figure, the convex arc line represents the transverse arch of the forefoot, and the concave arc line represents the concave structure 2. During the movement, the concave structure 2 begins to be compressed after the forefoot touches the ground. When the pressure is maximum, the concave structure 2 is compressed and deformed to the maximum, and a part of the reaction force of the ground is converted into the elastic potential energy of the concave structure 2. When the forefoot begins to push off the ground, the pressure applied by the foot to the concave structure 2 gradually decreases, and the concave structure 2 gradually returns to its original state, releasing its stored elastic potential energy and giving rebound feedback to the foot. When the toes leave the ground, the concave structure 2 returns to its original state. It can be understood that as long as the inner and outer sides of the concave structure 2 (i.e., the first toe side and the fifth toe side) are contacted and pressed down first, the effect of improving the energy feedback rate can be achieved. Therefore, under the premise of ensuring that the concave structure 2 is low in the middle and high on both sides, the cross-section of the concave structure 2 in the foot width direction can also include two or more arches, such as Fig.10 and Fig.11 shown.

[0070] It can be seen that through the deformation of the concave structure 2 in the vertical direction (that is, the thickness direction), additional rebound feedback can be generated, thereby realizing the utilization of energy at the metatarsophalangeal joint, enhancing the energy release in the forefoot transverse arch area, and improving the overall feedback efficiency of the sole.

[0071] In addition, the board of the present invention also has the following technical effects: 1. Dynamic fit to improve wearing comfort: The force feedback function dynamically adjusts the support and cushioning of the sole by sensing the pressure distribution when the foot moves, making the shoe fit the foot shape better and reducing friction and discomfort.

[0072] 2. Reduce sports injuries: The force feedback function can monitor and adjust the sole's absorption and rebound of impact in real time, reduce excessive load on joints and muscles, and reduce the risk of sports injuries.

[0073] 3. Optimize gait: By feeding back the pressure distribution of the foot, it helps correct bad gait, such as inversion or eversion, promotes a natural gait, and reduces the negative effects of long-term exercise on the body.

[0074] 4. Improve exercise efficiency: Good force feedback can effectively store and release energy, reduce energy loss, improve exercise performance, and reduce fatigue.

[0075] 5. Prevent chronic injuries: By continuously optimizing gait and reducing impact, the force feedback function helps prevent chronic injuries caused by long-term improper exercise, such as plantar fasciitis, knee arthritis, etc.

[0076] 6. Promote recovery: Some force feedback systems can also provide massage or micro-vibration after exercise to promote blood circulation and accelerate muscle recovery.

[0077] The force feedback function of the plate not only improves the comfort of sports shoes, but also significantly improves sports health by optimizing gait, reducing injuries and improving efficiency.

[0078] The specific range of the concave structure 2 can be adjusted according to actual needs, for example, the concave structure 2 extends forward to partially / completely cover the area 11 of the plate body 1 corresponding to the phalanges of the foot, and extends backward to partially / completely cover the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot. Fig.12 and Fig.13 As shown, the concave structure 2 of the board body 1 extends forward to partially cover the area 11 of the board body 1 corresponding to the phalanges of the foot, and extends backward to completely cover the area 13 of the board body 1 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 board body 1, increase the energy storage, and further enhance the energy release in the forefoot transverse arch area, and can also improve the comfort of exercise.

[0079] Reference Figures 1 to 8 The concave structure 2 of this embodiment completely covers the area 11 of the plate body 1 corresponding to the phalanges of the foot forward, and completely covers the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot backward, that is, the concave structure 2 of this embodiment is formed by the overall downward depression of the area of ​​the plate body 1 corresponding to the forefoot of the foot.

[0080] Combination Figure 2 to Figure 8 The curvature of the concave structure 2 of this embodiment gradually decreases from the middle to the front, and also gradually decreases from the middle to the back, so that the cross-section of the concave structure 2 in the foot length direction is an arc or bow shape that is concave downward, which is beneficial to improving the deformation ability of the concave structure 2, increasing the force arm effect on the metatarsophalangeal joint, and can match the gait, thereby improving the smoothness, comfort and efficiency of the running or walking process.

[0081] like Figure 2 and Figure 8As shown, the area 11 of the plate body 1 corresponding to the phalanges of the foot in this embodiment is tilted forward along the direction of the foot length, which helps to improve the wearer's phalanges to push and stretch, increase propulsion, reduce energy loss, and achieve better pushing and stretching efficiency. The forward tilting of the area 11 of the plate body 1 corresponding to the phalanges of the foot is combined with the concave shape of the concave structure 2 in the direction of the foot length, so that the bottom of the plate is roughly shovel-shaped in the direction of the foot length, which can reduce the bending of the metatarsophalangeal joint of the foot in the direction of the foot length, thereby reducing the loss of sports energy, improving the impulse of pushing on the ground, increasing the forward propulsion force, and ensuring the stability and efficiency of the transition from landing to pushing on the ground.

[0082] In other preferred embodiments of the present invention, the area 11 of the plate body 1 corresponding to the phalanges of the foot may also be parallel to the horizontal plane.

[0083] Reference Figure 6 The concave structure 2 of 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. The wing support portions can increase the contact area between the concave structure 2 and the foot (non-direct contact), play a certain supporting role, and improve the comfort of foot stepping. On the other hand, they can ensure that the concave structure 2 can be expanded outward when it is compressed and deformed, ensuring the effectiveness of the storage of elastic potential energy of the concave structure 2 when it is compressed and deformed.

[0084] The concave portion 21 is connected to the wing support portions 22 on both sides thereof in a smooth transition to reduce stress concentration at the connection between the concave portion 21 and the wing support portions 22, and enhance the structural strength of the concave structure 2. The wing support portions 22 may extend outward in an arc or a straight line from the connection between the concave portion 21 and the wing support portions 22. The wing support portions 22 preferably gradually change outward to be parallel to the horizontal plane or slightly tilted upward relative to the horizontal plane to improve wearing comfort.

[0085] In this embodiment, the width L of the concave portion 21 accounts for 45% to 90% of the width S of the concave structure 2 , and preferably 50% to 70%.

[0086] On the premise that the concave depth of the concave structure 2 remains unchanged, the smaller the L / S, the steeper the curvature of the concave structure 2, the stronger its rigidity, and the smaller the deformation under the same pressure. This solution is suitable for people with greater impact force, such as adults; the larger the L / S, the gentler the curvature of the concave structure 2, the smaller its rigidity, and the larger the deformation under the same pressure. This solution is suitable for people with less impact force, such as children.

[0087] It can be understood that in other preferred embodiments of the present invention, the concave structure 2 may also eliminate the wing support portion 22 .

[0088] Embodiment 2 Reference Fig.14 and Fig.15This embodiment is improved on the basis of the first embodiment. The plate body 1 of this embodiment is provided with two stress release grooves 3 in the area corresponding to the forefoot of the foot. The two stress release grooves 3 are respectively located on the inner and outer sides of the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot. The stress release grooves 3 extend inward from the edge of the plate body 1.

[0089] The number and position of the stress release grooves 3 can be adjusted according to actual needs, such as Fig.16 As shown, the plate body 1 is provided with four stress release grooves 3 in the area corresponding to the forefoot of the foot. Fig.17 As shown, the stress release groove 3 is located in the middle of the plate body 1. Fig.18 As shown, the stress relief groove 3 is provided in the area 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 area 12 of the plate body 1 corresponding to the metatarsophalangeal joint of the foot and the area 13 corresponding to the metatarsal bones of the foot, or it can cross the two aforementioned areas, such as extending inward from the edge of the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot to the area 12 corresponding to the metatarsophalangeal joint of the foot.

[0090] The stress release groove 3 can cut off the force transmission of the entire board when the foot lands on the ground. On the one hand, it can concentrate the force on the metatarsophalangeal joint of the forefoot and compress the board to produce deformation. On the other hand, it can maintain the flexible bending performance of the sole and improve the wearing comfort of the shoe.

[0091] In order to balance the overall rigidity and deformation capacity of the plate body 1 , the depth b of the stress release groove 3 extending inwardly in the foot width direction (being the orthographic projection of the stress release groove 3 in the foot width direction) preferably accounts for one third of the width c of the plate body 1 .

[0092] The shape of the stress release groove 3 is not limited, such as the straight line, Fig.18 The V-shaped Fig.19 The arc shown, etc.

[0093] The width d of the stress release groove 3 is preferably 1 to 5 mm.

[0094] Embodiment 3 This embodiment limits the thickness of the plate body 1 on the basis of the first embodiment. Fig. 20 As shown, the thickness e of the concave structure 2 is greater than the thickness of other parts of the plate body 1 .

[0095] Increasing the thickness of the concave structure 2 can enhance the rigidity of the concave structure 2 , enhance the stress of the concave structure 2 , and enable the concave structure 2 to store more elastic potential energy.

[0096] The thickness of the concave structure 2 can be selected to be 1.0-1.8 mm, preferably 1.0-1.5 mm.

[0097] The thickness of the plate 1 at various locations can be set according to the following scheme, in the direction of the foot length: ① The front end of the plate body 1: 1.0mm, the deepest part of the concave structure 2: 1.2mm, the rear of the plate body 1: 0.8~1.0mm; ② Front end of plate 1: 1.5mm, deepest part of concave structure 2: 1.8mm, rear of plate 1: 1.2mm; ③ The front end of the plate body 1 is 1.2mm, the deepest part of the concave structure 2 is 1.5mm, and the back is 1.0mm.

[0098] Reference Fig.21 , Fig.21 It is a schematic cross-sectional view of the area 13 of the plate body 1 corresponding to the metatarsal bones of the foot in the direction of the foot width. The dotted line part is the five metatarsal bones of the foot. The first to fifth metatarsal bones are arranged in sequence from right to left. The forefoot transverse arch is composed of the first to fifth metatarsal heads. 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, and the second metatarsal head is the highest from the ground. The deepest part of the concave structure 2 of this embodiment corresponds to the second metatarsal and third metatarsal areas. 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, so that it can withstand greater pressure, thereby improving the service life and safety of the board. The increase in the deepest thickness of the concave structure 2 can enable this area to better store energy when subjected to force, and quickly release this energy when pushing off the ground, thereby improving the energy release of the forefoot transverse arch area. Therefore, the thickness of the region 16 of the concave structure 2 corresponding to the second metatarsal bone to the third metatarsal bone of the foot is the thickest.

[0099] The thickness e of the concave structure 2 gradually decreases from the second metatarsal to the first metatarsal, and gradually decreases from the third metatarsal to the fifth metatarsal. When the concave structure 2 is compressed, in the width direction of the foot, the stress will be distributed along the arched cross-sectional shape of the concave structure 2. Gradually reducing the thickness from the deepest part of the concave structure 2 to the inner and outer sides can optimize the distribution of stress, making the overall structure of the concave structure 2 more reasonable and efficient. The design of the concave structure 2 gradually reducing the thickness from the deepest part to the inner and outer sides can also improve the rebound performance. The inner and outer sides of the concave structure 2 can rebound better, release the stored energy, and transfer the energy to the foot more effectively, improving the foot rebound feedback.

[0100] In addition, by gradually reducing the thickness from the deepest part to both sides, the overall weight of the board can be reduced while maintaining the strength and stability of the concave structure 2. Embodiment 4 Fig. 22 The sole for the left foot is shown, and the sole for the right foot is symmetrical with the left and right sole, which is not shown.

[0101] like Figures 22-24As shown, the sole of this embodiment includes a midsole 4 and a plate embedded in the midsole 4, and the plate is the plate described in any one of the above-mentioned embodiments one to three.

[0102] The sole of this embodiment can be made by a conventional "sandwich-type" midsole process, in which the midsole 4 includes an upper midsole 4, a plate and a lower midsole 4, the lower surface of the upper midsole 4 is adapted to the shape of the upper surface of the plate, the upper surface of the lower midsole 4 is adapted to the shape of the lower surface of the plate, and the upper midsole 4, the plate and the lower midsole 4 are bonded together by glue. In addition, an integrated midsole process can also be used, in which the plates are directly "bonded" together during the foaming process of the midsole 4, so as to reduce the influence of glue on the material properties of the midsole 4 in the conventional "sandwich-type" midsole 4 process, which is conducive to improving the overall performance and stability of the sole.

[0103] The midsole 4 materials are diverse. The common midsole 4 materials on the market are EVA (ethylene-vinyl acetate), TPU (thermoplastic polyurethane), PEBA (polyether block amide), etc. The performance of the midsole 4 depends not only on the material itself, but also on the foaming process, such as the supercritical foaming process. The foaming process is to form tiny pores inside the material through chemical reactions or physical methods to improve the material's resilience and shock-absorbing effect, thereby improving the overall performance of the sole.

[0104] The ratio between the depth of the concave structure 2 of the board and the thickness of the midsole 4 has an important influence on the performance and wearing experience of the sole. If the depth of the concave structure 2 is too deep and the midsole 4 is too thin, the foot may be subjected to excessive impact and discomfort; if the midsole 4 is too thick and the depth of the concave structure 3 is too shallow, the support and stability of the shoe may be weakened. The depth of the concave structure 2 of the board and the thickness of the midsole 4 need to work together to give full play to the performance of the board and midsole 4 materials.

[0105] Reference Fig.23 , the maximum depth h of the concave structure 2 of this embodiment accounts for 38% to 86% of the thickness a of the midsole 4. A reasonable ratio of the depth of the concave part 2 to the thickness of the midsole 4 can make the sole remain light and flexible while providing sufficient support and stability, ensuring that the rebound performance of the board is fully utilized, thereby improving running efficiency and speed.

[0106] The maximum depth h of the concave structure 2 is 10-30 mm. The thickness a of the midsole 4 is 13-35 mm, preferably 18-35 mm.

[0107] In addition, the placement of the board also has an important impact on the performance and comfort of the sole. If the distance between the concave structure 2 and the upper surface of the midsole 4 is too large, the deformation ability of the concave structure 2 will be weakened, and the rebound force from the board may be absorbed by the upper midsole, thereby reducing its rebound performance; if the distance between the concave structure 2 and the upper surface of the midsole 4 is too small, it may not provide sufficient shock absorption effect, and the hard texture of the board may be directly transmitted to the sole of the foot, resulting in poor wearing comfort.

[0108] The moderate distance between the concave structure 2 and the upper surface of the midsole 4 can ensure that the board rebounds fully when bent, while providing sufficient cushioning effect, reducing the impact on the foot during exercise and improving the comfort of exercise.

[0109] The distance between the concave structure 2 and the upper surface of the midsole 4 accounts for 7% to 30% of the thickness of the midsole, and the distance between the concave structure 2 and the lower surface of the midsole 4 accounts for 7% to 30% of the thickness of the midsole. This ratio can ensure that the rebound performance of the board is fully utilized without excessively limiting the cushioning and rebound performance of the midsole, as well as the comfort of the sole. Preferably, the concave structure 2 is placed in the middle of the thickness direction of the midsole 4 to help disperse the impact force generated during exercise, reduce the degree of wear of the midsole 4 material, and thus extend the service life of the shoe.

[0110] The performance test of the sole of this embodiment is carried out, and the shape of the tested board is the same as Fig.12 As shown, the thickness of the concave structure is consistent with the thickness of other positions of the plate: Functional verification index: Assuming that other factors remain unchanged, the mechanical propulsion performance of the sole is evaluated by the support time and air time during the movement of wearing the sole. Generally, at the same speed, the shorter the support time and the less active force time, the more effort is saved. The better the mechanical propulsion performance, the faster the step frequency and the larger the step length.

[0111] The support time is the time from the foot touching the ground to the toe leaving the ground, and the flight time is the time from the toe leaving the ground to the other foot touching the ground. The units of the support time and the flight time are milliseconds.

[0112] The experimental data are as follows: Experimental example 1: h=13mm, a=17mm.

[0113]

[0114] Experimental example 2: h=5mm, a=13mm.

[0115]

[0116] Experimental example 3: h=30mm, a=35mm.

[0117]

[0118] Embodiment 5 The shoe of this embodiment has the sole of the fourth embodiment, and it has the same advantages as above. The shoe can be used as a shoe for running, rope skipping, basketball, etc., regardless of the purpose of the shoe.

[0119] The shoe of this embodiment is set as an experimental example (the width S of the concave structure 2 is 100 mm, the maximum depth h is 13 mm, the width L of the concave part 21 is 55 mm, the thickness a of the midsole 4 is 17 mm; the shape of the tested board is the same as Fig.12 As shown, the thickness of the concave structure is consistent with the thickness of other positions of the board body), ordinary flat carbon board shoes (the area 12 of the board corresponding to the metatarsophalangeal joint does not have a concave structure 2) are used as the control example, and various sports tests are performed wearing the experimental example and the control example. The test results are as follows: (1) Running A total of 16 people’s data were collected, and the average value of the 16 people was taken. Calculated at a running speed of 20km / h, the total marathon time was reduced by 167.117s.

[0120] The calculation is based on the following:

[0121] The experimental data of the experimental example and the control example at different running speeds are as follows:

[0122] Figure 25 to Figure 27 For the chart corresponding to the above table, refer to the above table and Fig.25 , medium speed, the experimental example has a single step length of 2cm (0.76%) more than the control example, refer to the above table and Fig.26 , at high speed, the single step time is reduced by 0.005s (1.62%), refer to the above table and Fig. 27 ,With the increasing running speed, the proportion of the support period of the experimental example decreased, and the proportion of the air period increased, indicating that the ,test athletes had faster stride frequency, longer stride length, and less time ,for the same distance, and the propulsion performance of the ,experimental example was stronger.

[0123] (2) Basketball In the height test, the experimental group was 2cm higher than the control group in single-foot hopping and 4cm higher in double-foot hopping.

[0124] (3) Long jump The standing long jump test was performed by wearing the shoes of the experimental example and the control example, and the dorsiflexion angle of the metatarsophalangeal joint of the wearer was collected. The larger the dorsiflexion angle, the more negative work was done, indicating that the energy loss was greater; the smaller the dorsiflexion angle, the less negative work was done, indicating that the energy loss was smaller, indicating that the impact force was used more effectively.

[0125] After testing, the dorsiflexion angle of the experimental example was 13.4°, and the dorsiflexion angle of the control example was 18.6°. That is, the experimental example can save 27.9% of energy.

[0126] After data collection by the vicon data acquisition system, the long jump performance of the experimental example was improved by 5cm compared with the control example.

[0127] Embodiment 6 This embodiment discloses a method for improving the force feedback efficiency of the sole, which includes arranging a plate of any one of the first to third embodiments in the midsole 4 of the sole, such as Fig. 9 As shown, the concave structure 2 of the plate can store elastic potential energy as the transverse arch of the forefoot is compressed and deformed after the forefoot touches the ground and before it pushes off the ground. In the process of pushing off the ground, the elastic potential energy stored is released to provide rebound force feedback to the foot, thereby realizing the utilization of energy at the metatarsophalangeal joint, enhancing the energy release in the transverse arch area of ​​the forefoot, and improving the overall force feedback efficiency of the sole.

[0128] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for improving sole force feedback efficiency, characterized in that: A plate is arranged in the midsole (4) of the sole, the plate comprising a plate body (1), the plate body (1) being concave downwardly in an area (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 direction of the width of the foot comprising at least one arch with the arch mouth facing upwards; The concave structure (2) can store elastic potential energy as the transverse arch of the forefoot is compressed and deformed after the forefoot touches the ground and before it pushes off the ground. In the process of pushing off the ground, the stored elastic potential energy is released to provide rebound force feedback to the foot.

2. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The curvature of the concave structure (2) gradually decreases from the middle portion toward the front, and / or gradually decreases from the middle portion toward the back.

3. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The concave structure (2) extends forward to completely or partially cover the area (11) of the plate body (1) corresponding to the phalanges of the foot, and / or the concave structure (2) extends backward to completely or partially cover the area (13) of the plate body (1) corresponding to the metatarsal bones of the foot.

4. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The area (11) of the plate body (1) corresponding to the phalanges of the foot is tilted forward along the length direction of the foot.

5. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The concave structure (2) comprises: a concave portion (21) and wing support portions (22) extending outwards from inner and outer sides of the concave portion (21) respectively.

6. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The maximum depth of the concave structure 2 is 10 to 30 mm.

7. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The maximum depth of the concave structure (2) accounts for 38% to 86% of the thickness of the midsole (4).

8. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The thickness of the concave structure (2) is greater than the thickness of other parts of the plate body (1).

9. The method for improving sole force feedback efficiency according to claim 1, characterized in that: The plate body (1) is provided with a stress relief groove (3) in an area corresponding to the forefoot of the foot.

10. The method for improving sole force feedback efficiency according to claim 9, characterized in that: At least one stress release groove (3) is provided on the inner side of the plate body (1) corresponding to the forefoot area, and / or at least one stress release groove (3) is provided on the outer side of the plate body (1) corresponding to the forefoot area, and the stress release groove (3) is extended inward from the edge of the plate body (1).

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