Torsion-resistant through-TPU sole for children's sports shoes

Abstract

The application relates to the technical field of shoes, in particular to a torsion-resistant outsole for children's sports shoes with a flexible through-type TPU, which comprises a main outsole body and a through-type support bone body. The main outsole body is made of an elastomer material, and the through-type support bone body is made of a hard support material and has greater rigidity. The through-type support bone body is arranged in the arch area along the length direction of the main outsole body in a one-piece structure and comprises a front end part, a middle part and a rear end part. The front end part is provided with a first support part for enhancing the lateral support force of the forefoot, and the rear end part is provided with a second support part for converting the impact force into forward kinetic energy. The bottom of the main outsole body is provided with a zigzag part and an anti-skid layer. The application has the effects of conforming to the arch curve of children, enhancing the stable torsion-resistant performance, reducing the sports burden, recycling the kinetic energy and increasing the grip force.

Description

Technical Field

[0001] This application relates to the field of footwear technology, and more particularly to a flexible, through-type TPU anti-torsion outsole for children's sports shoes. Background Technology

[0002] Children's foot bones and muscles are still developing, and their daily running and jumping movements are frequent and subject to complex forces. As the outsole, which is the ground contact and load-bearing structure, its performance is directly related to foot development and sports safety.

[0003] Currently, most children's athletic shoe outsoles utilize a one-piece molding process with rubber or EVA, with some incorporating TPU support plates in the arch and heel to enhance local rigidity. However, the inventors discovered in practical applications that these partially inlaid structures only achieve single-point rigidity enhancement; the support plates lack mechanical connection and cannot form a continuous, full-length force transmission path. When children run or jump laterally, the forefoot, arch, and heel bear force independently, leading to uneven foot stress and an increased risk of ankle sprains. Simultaneously, the interface between the partially inlaid TPU and the main sole experiences concentrated stress during repeated bending, making them prone to detachment and separation after prolonged use. Furthermore, increasing the overall rigidity of the outsole to compensate for insufficient local support increases forefoot bending resistance, restricting the natural movement of children's feet. Summary of the Invention

[0004] In order to improve the problems of children's sports shoe outsoles that only partially embed TPU structures, resulting in the inability to form full-length mechanical transmission, poor support coordination, uneven foot force during exercise leading to sprains, and loose bonding between TPU and the main body of the sole, this application provides a torsional outsole for children's sports shoes with flexible, through-type TPU.

[0005] This application provides a flexible, through-type TPU anti-torsion outsole for children's sports shoes, employing the following technical solution: A flexible, through-type TPU anti-torsion outsole for children's sports shoes includes an outsole body and a through-type support bone. The outsole body has a forefoot area, an arch area, and a heel area. The outsole body is made of a first material, and the through-type support bone is made of a second material, the second material having a higher rigidity than the first material. The through-type support bone extends along the length of the outsole body and is disposed on the arch area of ​​the outsole body. The through-type support bone is a one-piece molded structure. The through-type support bone includes a front end located in the forefoot area, a middle part located in the arch area, and a rear end located in the heel area. The front end extends with a first support portion, which is flush with the bottom of the forefoot area, to enhance lateral support force in the forefoot. The rear end extends with a second support portion, which is located between the bottom and top of the heel area in the height direction of the heel area, to convert impact force into forward kinetic energy.

[0006] By adopting the above technical solution, a through-type support bone is installed along the length of the outsole body in the arch area, allowing the one-piece through-type support bone to extend to both the forefoot and heel areas, forming a full-length mechanical transmission skeleton within the outsole body. The front end extends to form a first support section, flush with the bottom of the forefoot area, providing lateral support to the forefoot during exercise and preventing excessive forefoot deformation. The rear end extends to form a second support section, located between the bottom and top of the heel area in the height direction. When the child's heel strikes the ground, the second support section undergoes elastic deformation, converting some of the impact force into forward kinetic energy. Through the linkage between forefoot stabilization and heel energy recovery, a synergistic support system is formed, ensuring even force distribution on the child's foot during exercise, effectively reducing the risk of ankle sprains and strains. Simultaneously, the one-piece molded structure eliminates the risk of detachment caused by partial inlays.

[0007] Optionally, the first material is an elastomer material, and the second material is a rigid support material.

[0008] By adopting the above technical solutions, the main body of the outsole uses an elastomer material to provide lightweight cushioning and a comfortable feel, while the through-type support bone uses a rigid support material to provide structural rigidity and torsional support. The two form a soft and hard synergistic mechanical system through the difference in rigidity, which takes into account both cushioning performance and support stability without excessively increasing the weight of the outsole.

[0009] Optionally, the cross-section of the through-type support bone is I-shaped to simultaneously improve longitudinal bending resistance and lateral torsional resistance.

[0010] By adopting the above technical solution, the I-shaped cross-section of the through-type support frame is composed of the upper flange, the lower flange and the web connecting the two to form a bending mechanical structure. Combined with the deformation basis provided by the elastic material of the outsole body, the through-type support frame has excellent longitudinal bending stiffness and transverse torsional stiffness with the same amount of material, and significantly improves the bending and torsional performance of the outsole without increasing the amount of material.

[0011] Optionally, the middle part of the through-type support bone is provided with an arc-shaped part facing the arch of the foot, and a through part is provided on the arc-shaped part. The arc-shaped part and the through part cooperate to fit the curve of the child's arch and provide appropriate support.

[0012] By adopting the above technical solution, the arc-shaped part conforms to the physiological curve of the child's arch to provide uniform support, while the whole part reserves space for deformation avoidance for the arch muscles. The two work together to form a shape-conforming support structure, which provides appropriate support to relieve arch fatigue and avoids restricting the natural development of the arch due to excessive rigidity.

[0013] Optionally, the bottom of the outsole body is provided with multiple bends at intervals along the length direction. The bends are located in the forefoot area to reduce the movement burden when the forefoot of a child bends.

[0014] By adopting the above technical solution, multiple flexural sections form a pre-set bending line on the bottom of the outsole, guiding the outsole to bend in a predetermined position, so that the bending position matches the natural bending point of the metatarsophalangeal joint of the child's foot, reducing the bending resistance of the forefoot and reducing the extra work burden on the foot muscles during the child's exercise.

[0015] Optionally, the first support portion on the front end extends to the metatarsophalangeal joint flexion position in the forefoot area; the second support portion extends along the rear end in a direction away from the arch area, and one end of the second support portion away from the arch area extends to the upper middle part of the heel area.

[0016] By adopting the above technical solution, the first support part provides lateral support at the metatarsophalangeal joint flexion position to enhance forefoot stability without interfering with the natural flexion of the foot. The second support part transmits the landing impact force forward along the support bone body in the upper middle part of the heel area to convert it into forward kinetic energy. The through-type support bone body forms a full-foot mechanical transmission path from the metatarsophalangeal joint to the upper middle part of the heel.

[0017] Optionally, the thickness of the first support portion is less than the thickness of the second support portion.

[0018] By adopting the above technical solution, the thinner first support part in the forefoot area reduces interference with the bending of the metatarsophalangeal joint to ensure the flexibility of children's natural foot movements, while the thicker second support part in the heel area generates greater elastic deformation upon landing to store more impact energy and release it as forward kinetic energy when pushing off the ground.

[0019] Optionally, the first support portion includes wing-shaped support pieces that extend outward from both sides of the front end portion.

[0020] By adopting the above technical solution, the wing-shaped support plate extends from the front end to both sides to expand the coverage of lateral support for the forefoot. When children exercise, it simultaneously restrains the lateral displacement of the forefoot from both sides, reducing the risk of excessive inversion or eversion of the foot.

[0021] Optionally, the second support portion includes wing-shaped support pieces that extend outward from both sides of the rear end portion.

[0022] By adopting the above technical solution, the wing-shaped support plate extends from the rear end to both sides to expand the force-bearing area and elastic deformation space of the heel area. When the child's heel hits the ground, the wing-shaped plates on both sides undergo elastic deformation at the same time to absorb more impact energy. When the deformation recovers, the elastic potential energy is released along the length of the outsole to drive the foot to roll forward.

[0023] Optionally, the through-type support bone and the main body of the outsole are provided with a concave-convex interlocking structure on their mating surfaces; the edges of the through-type support bone are provided with a rounded corner structure.

[0024] By adopting the above technical solutions, the interlocking structure forms a mechanical interlock at the joint surface to compensate for the insufficient strength of the adhesive bond. Even if the adhesive layer ages, the structural integrity can still be maintained by the mechanical interlock. The rounded corner structure eliminates the sharp edges of the supporting bone to improve the safety of children wearing it, while reducing stress concentration points to reduce the risk of cracks in the supporting bone during long-term bending.

[0025] In summary, this application has the following beneficial effects: 1. The through-type support bone is set along the length of the outsole body in the arch area, and the one-piece molded through-type support bone extends to the forefoot area and the heel area respectively, forming a full-length mechanical transmission skeleton in the outsole body. This solves the problems of children's sports shoes outsoles that only partially embed TPU structures, resulting in the inability to form full-length mechanical transmission, poor support coordination, uneven foot force during exercise, easy sprains, and loose bonding between TPU and the outsole body, which are easy to fall off. This makes the feet of children's feet evenly stressed during exercise, effectively reducing the risk of sprains and twists. At the same time, the one-piece molded structure eliminates the risk of falling off caused by partial embedding. 2. The front end extends to provide a first support part that is flush with the bottom of the forefoot area, providing lateral support to the forefoot during the child's exercise and preventing excessive deformation of the forefoot; the rear end extends to provide a second support part, which is located between the bottom and top of the heel area in the height direction of the heel area. When the child's heel hits the ground, the second support part undergoes elastic deformation, converting part of the impact force into forward kinetic energy. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the outsole side view structure according to an embodiment of this application; Figure 2 This is a top view of the base structure of an embodiment of this application; Figure 3 This is a schematic diagram of the exploded structure of the base plate according to an embodiment of this application; Figure 4 This is a schematic diagram of the isometric structure of the base of an embodiment of this application; Figure 5 This is a schematic diagram of another isometric structure of the base of an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures: 1. Outsole body; 11. Forefoot area; 12. Arch area; 13. Heel area; 14. Twist section; 15. Annular groove; 16. First reinforcing rib; 17. Second reinforcing rib; 2. Through-type support bone; 21. Front end; 22. Middle section; 221. Arc-shaped section; 222. Through section; 23. Rear end; 24. First support section; 241. First wing-shaped support plate; 25. Second support section; 251. Second wing-shaped support plate; 3. Interlocking structure; 4. Rounded corner structure; 5. Anti-slip layer; 51. Circular protrusion; 52. Wavy groove; 53. Serrated protrusion; 54. Open arc-shaped groove. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] This application discloses a flexible, through-type TPU outsole for children's sports shoes to improve the problems in related technologies where the outsole of children's sports shoes only partially embeds TPU structures, resulting in the inability to form full-length mechanical transmission, poor support coordination, uneven foot force during exercise leading to ankle sprains, and the TPU not being tightly bonded to the main body of the sole and easily falling off.

[0030] See Figure 1 and Figure 2 A flexible, through-type TPU anti-torsion outsole for children's sports shoes includes an outsole body 1 and a through-type support bone 2. The outsole body 1 has a forefoot area 11, an arch area 12, and a heel area 13. The outsole body 1 is made of a first material, and the through-type support bone 2 is made of a second material, the second material being more rigid than the first material. The through-type support bone 2 is disposed along the length of the outsole body 1 and extends through the arch area 12 of the outsole body 1. The through-type support bone 2 is a one-piece molded structure. The through-type support bone 2 includes a front end 21 located in the forefoot area 11, a middle part 22 located in the arch area 12, and a rear end 23 located in the heel area 13. The front end 21 extends with a first support part 24, which is flush with the bottom of the forefoot area 11, to enhance the lateral support force of the forefoot. The rear end 23 extends to provide a second support 25, and the second support 25 is located between the bottom and top of the heel area 13 in the height direction of the heel area 13, for converting the impact force into forward kinetic energy.

[0031] See Figure 1 and Figure 2A through-type support bone 2 runs along the length of the outsole body 1 and is installed on the arch area 12. The integrally molded through-type support bone 2 extends to the forefoot area 11 and the heel area 13, forming a full-length mechanical transmission skeleton within the outsole body 1. The front end 21 extends to provide a first support part 24, flush with the bottom of the forefoot area 11, providing lateral support to the forefoot during exercise and preventing excessive forefoot deformation. The rear end 23 extends to provide a second support part 25, located away from the bottom of the heel area 13. When the child's heel strikes the ground, the second support part 25 undergoes elastic deformation, converting some of the impact force into forward kinetic energy. Through the linkage of the through-type support bone 2 with forefoot stabilization and heel energy recovery, a synergistic support system is formed, ensuring even force distribution on the child's foot during exercise, effectively reducing the risk of ankle sprains and strains. Simultaneously, the integrally molded structure eliminates the risk of detachment caused by partial inlays.

[0032] See Figure 1 and Figure 2 Specifically, the first material is an elastomer, and the second material is a rigid support material. This creates a composite structure at the material level, where the outsole body 1 and the through-type support bone 2 form an elastic matrix and a rigid skeleton. This improves upon the technical problems in related technologies where children's sports shoe outsoles using a single material cannot simultaneously provide cushioning and support performance, or where unreasonable material combinations lead to excessive weight or rigidity that affects children's foot development. The outsole body 1 provides lightweight cushioning and a comfortable feel to suit children's foot development needs, while the through-type support bone 2 provides structural rigidity and torsional support to ensure sports safety. The two materials, through the rigidity difference between the elastomer and the rigid support material, form a synergistic mechanical system, achieving both cushioning performance and support stability without excessively increasing the outsole weight.

[0033] In one embodiment, the elastomer material is high-density EVA (ethylene-vinyl acetate copolymer), and the rigid support material is TPU (thermoplastic polyurethane elastomer rubber). The outsole body 1 uses an elastomer material to provide lightweight cushioning and a comfortable feel, while the through-type support bone 2 uses a rigid support material to provide structural rigidity and torsional support. The two form a synergistic mechanical system through their difference in rigidity.

[0034] In other embodiments, the elastomer material can also be a foamed elastomer material such as Phylon (secondary foamed EVA), PU (polyurethane), or MD (polydimethylformamide), as long as the material can provide shock absorption and has a low density, it can be used as the first material. The rigid support material can also be a nylon, glass fiber reinforced plastic, or carbon fiber composite material, as long as the rigidity of the material is greater than that of the elastomer material and it can provide structural support, it can be used as the second material.

[0035] See Figure 1 and Figure 2Specifically, the bottom of the outsole body 1 has multiple bends 14 spaced along its length. These bends 14 are located in the forefoot area 11 and are used to reduce the stress on the child's forefoot during movement. The bottom of the outsole body 1 has an anti-slip layer 5, which is fixedly connected to the outsole body 1 by adhesive. The anti-slip layer 5 increases the grip of the outsole bottom. The bends 14 are located on the anti-slip layer 5.

[0036] In one embodiment, the number of bends 14 is three, and the three bends 14 are arranged at intervals along the length of the outsole body 1. The bends 14 are arc-shaped grooves, and the width of the arc-shaped grooves is adapted to the bending area of ​​the forefoot of a child's foot. The multiple bends 14 guide the outsole to bend in a predetermined position, so that the bending position matches the natural bending point of the metatarsophalangeal joint of the child's foot, thereby reducing the bending resistance of the forefoot.

[0037] In other embodiments, the number of bends 14 may be two or four, and the bends 14 may be V-shaped grooves or rectangular grooves, as long as the bends 14 can form a pre-set bending line at the bottom of the base.

[0038] See Figure 1 and Figure 2 In one embodiment, the anti-slip layer 5 is a rubber sheet with wear resistance and elasticity, which is glued and fixed to the bottom of the outsole body 1.

[0039] See Figure 1 and Figure 2 In one embodiment, the rubber sheet is provided with a plurality of circular protrusions 51 and a plurality of wavy grooves 52 on the part corresponding to the forefoot area 11. The circular protrusions 51 and the wavy grooves 52 are arranged in an array to provide uniform grip in all directions.

[0040] See Figure 1 and Figure 2 In one embodiment, the rubber sheet is provided with a plurality of serrated protrusions 53 and a plurality of wavy grooves 52 corresponding to the heel area 13. The plurality of serrated protrusions 53 and the plurality of wavy grooves 52 are symmetrically distributed about the central axis of the length direction of the outsole body 1 and are arranged in an array along the length direction of the outsole body 1 to provide directional anti-slip capability.

[0041] In other embodiments, an arc-shaped groove is also provided at the bottom of the outsole body 1 corresponding to the arc-shaped groove on the anti-slip layer 5. The arc-shaped groove on the anti-slip layer 5 and the arc-shaped groove on the outsole body 1 are opposite to each other in the height direction and are interconnected. Together, they form a bend 14 that runs through the anti-slip layer 5 and the outsole body 1. This is used to make the anti-slip layer 5 and the outsole body 1 bend synchronously at the bend 14 when the forefoot of the child bends, so as to adapt to the bending angle requirements under different exercise intensities.

[0042] See Figure 1 and Figure 2 The forefoot area 11 of the outsole body 1 has multiple first reinforcing ribs 16 protruding outwards from its sidewall. The first reinforcing ribs 16 extend along the height direction of the outsole body 1 to provide lateral torsional support when the forefoot of a child's foot bends and to provide elastic recovery force when the bend returns to its original position. The heel area 13 of the outsole body 1 has multiple second reinforcing ribs 17 protruding outwards from its sidewall. The second reinforcing ribs 17 are triangular, with the base of the triangle located near the bottom of the outsole body 1 and the apex of the triangle extending towards the top of the outsole body 1. These ribs enhance the torsional stiffness of the heel area 13 when the child's heel strikes the ground and provide elastic recovery force after impact.

[0043] In other embodiments, the first reinforcing rib 16 may also extend along the length of the outsole body 1 or be distributed in a grid pattern, as long as the first reinforcing rib 16 can provide lateral torsional support when the forefoot is bent. The second reinforcing rib 17 may also be trapezoidal or arc-shaped, as long as the width of the second reinforcing rib 17 gradually decreases from the bottom to the top of the outsole body 1.

[0044] See Figure 1 and Figure 2 Furthermore, the anti-slip layer 5 has a through-hole arc-shaped groove 54, which is opened along the length of the outsole body 1 and passes through the forefoot area 11, the arch area 12 and the heel area 13.

[0045] See Figure 1 and Figure 2 Specifically, the open arc-shaped groove 54 extends along the length of the outsole body 1 through the forefoot area 11, the arch area 12, and the heel area 13, creating two independent anti-slip zones on the bottom of the outsole body 1 with the anti-slip layer 5. The open arc-shaped groove 54 corresponds to the bend in the flexure section 14, preventing the anti-slip layer 5 from continuously covering the bend and thus eliminating its constraint on the forefoot bending, ensuring that the drag-reducing function of the bend in the flexure section 14 is not weakened by the anti-slip layer 5. Simultaneously, a portion of the second support part 25 of the through-type support bone 2 is exposed at the corresponding position in the heel area 13, providing space for the second support part 25 to undergo elastic deformation upon landing, ensuring the normal functioning of the kinetic energy recovery function.

[0046] In one embodiment, there is one open arc-shaped groove 54, which is located at the middle 22 of the width direction of the main body 1. The width of the open arc-shaped groove 54 is 3mm to 5mm. The open arc-shaped groove 54 is used to expose a part of the main body 1 and the through support bone 2.

[0047] In other embodiments, the number of open arc grooves 54 can also be two, with the two open arc grooves 54 located on both sides of the width direction of the main body 1. The width of the open arc grooves 54 can also be 2mm to 6mm, as long as the open arc grooves 54 can make the anti-slip layer 5 form a break at the bending line.

[0048] In other embodiments, the anti-slip layer 5 can also be an anti-slip texture directly formed on the bottom of the outsole body 1, which can be formed by molding or etching. The protrusions in the forefoot area 11 can also be hexagonal or triangular, and the protrusions in the heel area 13 can also be herringbone-shaped, as long as the protrusions in the forefoot area 11 and the heel area 13 have different shapes and can respectively meet the grip requirements of different stages of movement. The anti-slip layer 5 forms a high-friction coefficient contact surface on the bottom of the outsole to improve the grip between the outsole and the ground, providing stable push-off support and emergency stop anti-slip protection when children run and jump.

[0049] See Figure 1 and Figure 2 Specifically, the cross-section of the through-type support rib 2 is I-shaped, which is used to simultaneously enhance longitudinal bending resistance and lateral torsional resistance. The I-shaped cross-section consists of an upper flange, a lower flange, and a web connecting the two, forming a bending-resistant mechanical structure.

[0050] In one embodiment, the I-shaped cross-section of the through-type support rib 2 is integrally formed by injection molding. The I-shaped cross-section enables the through-type support rib 2 to have excellent longitudinal bending stiffness and lateral torsional stiffness with the same amount of material, so that the outsole can effectively resist bending deformation in the front-to-back direction and torsional deformation in the left-to-right direction when children are exercising.

[0051] In other embodiments, the cross-section of the through-type support rib 2 may also be T-shaped or U-shaped, as long as the cross-sectional shape can provide both longitudinal bending resistance and lateral torsional resistance.

[0052] See Figure 1 and Figure 2 Specifically, the middle part 22 of the through-type support bone 2 is provided with an arc-shaped part 221 facing the arch of the foot. The arc-shaped part 221 has a through part 222. The arc-shaped part 221 and the through part 222 cooperate to fit the curve of the child's arch and provide appropriate support.

[0053] In one embodiment, the arc-shaped portion 221 is specifically an arc-shaped protrusion formed by the central portion 22 protruding towards the arch of the foot, with a protrusion height of 2mm to 3mm. The through portion 222 is specifically an elliptical perforated hole, the long axis of which extends along the length of the outsole body 1. The arc-shaped protrusion conforms to the physiological curve of a child's arch and provides uniform support, while the elliptical perforated hole provides space for arch muscle activity. Together, they form a contoured support structure that provides appropriate support to relieve arch fatigue while avoiding excessive rigidity that could restrict the natural development of the arch.

[0054] In other embodiments, the height of the arc-shaped protrusion can also be 1.5mm to 4mm, and the through portion 222 can also be a circular hollow hole, a waist-shaped hollow hole or a diamond-shaped hollow hole, as long as the through portion 222 can reserve space for deformation avoidance for foot arch muscle activity.

[0055] See Figure 1 and Figure 2 Specifically, the first support portion 24 on the anterior end 21 extends to the metatarsophalangeal joint flexion position of the forefoot region 11. The second support portion 25 extends along the posterior end 23 in a direction away from the arch region 12, and the end of the second support portion 25 away from the arch region 12 extends to the upper middle part of the heel region 13.

[0056] In one embodiment, the front end of the first support portion 24 extends to the metatarsophalangeal joint flexion position of the forefoot area 11 of the outsole body 1, and the upper end of the second support portion 25 extends to the area between the middle 22 and the top of the heel area 13 in the height direction. The first support portion 24 provides lateral support at the metatarsophalangeal joint flexion position to enhance forefoot stability without interfering with the natural flexion of the foot, and the second support portion 25 transmits the landing impact force forward along the supporting bone in the upper part of the heel area 13 to convert it into forward kinetic energy.

[0057] In other embodiments, the first support 24 may extend to a certain distance in front of or behind the metatarsophalangeal joint flexion position of the forefoot area 11, and the second support 25 may extend to the top of the heel area 13, as long as the extension positions of the first support 24 and the second support 25 can match the mechanical transmission path with the biomechanical characteristics of children's foot movement.

[0058] See Figure 1 and Figure 2 Furthermore, the thickness of the first support portion 24 is less than the thickness of the second support portion 25. The thinner first support portion 24 in the forefoot area 11 can reduce interference with the flexion of the metatarsophalangeal joint, thereby ensuring the flexibility of the child's natural foot movement, while the thicker second support portion 25 in the heel area 13 generates greater elastic deformation upon landing to store more impact energy.

[0059] In one embodiment, the thickness of the first support portion 24 is 1.5 mm to 2 mm, and the thickness of the second support portion 25 is 2.5 mm to 3.5 mm.

[0060] In other embodiments, the thickness of the first support portion 24 may be 1 mm to 1.5 mm, and the thickness of the second support portion 25 may be 3 mm to 4 mm, as long as the thickness of the first support portion 24 is less than the thickness of the second support portion 25 and both can respectively meet the needs of forefoot flexibility and heel energy storage.

[0061] See Figure 1 and Figure 3 Specifically, the first support portion 24 includes a first wing-shaped support piece 241, which extends outward from both sides of the front end portion 21.

[0062] In one embodiment, the first wing-shaped support piece 241 is a sheet-like structure that extends symmetrically outward from both sides of the front end portion 21, and the bottom surface of the first wing-shaped support piece 241 is flush with the bottom of the forefoot area 11. The first wing-shaped support piece 241 extends from the front end portion 21 to both sides to expand the lateral support coverage of the forefoot, and simultaneously restrains the lateral displacement of the forefoot from both sides when the child is exercising, reducing the risk of excessive inversion or eversion of the foot.

[0063] In other embodiments, the first wing-shaped support piece 241 may also be an asymmetrical structure, for example, extending only from the inner or outer side, as long as the first wing-shaped support piece 241 can laterally constrain the displacement of the forefoot.

[0064] See Figure 1 and Figure 3 Specifically, the second support portion 25 includes a second wing-shaped support piece 251, which extends outward from both sides of the rear end portion 23.

[0065] In one embodiment, the second wing-shaped support piece 251 is a sheet-like structure that extends symmetrically outward from both sides of the rear end 23, and is located in the upper middle part of the heel area 13. The second wing-shaped support piece 251 extends from the rear end 23 to both sides to expand the force-bearing area and elastic deformation space of the heel area 13. When the child's heel hits the ground, the two wing-shaped pieces on both sides undergo elastic deformation simultaneously to absorb more impact energy. When the deformation recovers, elastic potential energy is released along the length of the outsole to drive the foot to roll forward.

[0066] In other embodiments, the second wing-shaped support piece 251 may also be an asymmetrical structure, for example, extending only from the inner or outer side, as long as the second wing-shaped support piece 251 can expand the force-bearing area and elastic deformation space of the heel region 13.

[0067] See Figure 3 and Figure 4Specifically, the mating surface between the through-type support bone 2 and the main body 1 is provided with a concave-convex interlocking structure 3. The edges of the through-type support bone 2 are provided with rounded corner structures 4.

[0068] In one embodiment, the interlocking structure 3 consists of multiple protrusions and recesses formed on the mating surface of the through-type support bone 2. When the first material, i.e., the outsole body 1, is filled, the multiple protrusions and recesses formed on the outsole body 1 are adapted to match the multiple recesses and protrusions on the through-type support bone 2, achieving a mechanical interlocking by the staggered arrangement of the protrusions and recesses. The interlocking structure 3 forms a mechanical interlock at the mating surface, thereby compensating for insufficient adhesive bonding strength. Even if the adhesive layer ages, the structural integrity can still be maintained by the mechanical interlocking.

[0069] See Figure 3 and Figure 5 In other embodiments, the concave-convex occlusive structure 3 can also be a wavy occlusive surface or a serrated occlusive surface, as long as the concave-convex occlusive structure 3 can form a physical fit at the mating surface.

[0070] In one embodiment, the radius of the rounded corner structure 4 is 0.5 mm to 1 mm. Arranging the rounded corner structure 4 can eliminate the sharp edges of the support bone, thereby improving the safety of children wearing it, while reducing stress concentration points to reduce the risk of cracking of the support bone during long-term bending.

[0071] In other embodiments, the radius of the rounded corner structure 4 can also be 0.3mm to 1.5mm, as long as the rounded corner structure 4 can eliminate the sharp edges of the supporting bone body.

[0072] See Figure 1 and Figure 2 Furthermore, the through-type support bone 2 also passes through the bottom of the arch area 12 of the outsole body 1. An annular groove 15 is formed on the outsole body 1 around the edge of the through-type support bone 2.

[0073] In one embodiment, an annular groove 15 is formed at the bottom of the arch area 12 of the outsole body 1. The annular groove 15 surrounds the protrusion position of the through-type support bone 2, and the depth of the annular groove 15 is 1mm to 2mm, and the width is 2mm to 3mm. The annular groove 15 is used to form a stress relief ring at the position where the through-type support bone 2 protrudes from the outsole body 1. When the through-type support bone 2 is subjected to bending or torsional loads during a child's exercise, the annular groove 15 provides deformation avoidance space for the outsole body 1 at the protrusion edge, preventing cracks from forming in the outsole body 1 at the protrusion edge due to the inconsistent deformation of the two materials. At the same time, the annular groove 15 also serves to delay the intrusion of external moisture and sand along the protrusion edge into the joint surface between the through-type support bone 2 and the outsole body 1.

[0074] In other embodiments, the depth of the annular groove 15 may be 0.5 mm to 3 mm, and the width may be 1.5 mm to 4 mm, as long as the annular groove 15 can provide stress relief space for the through-hole support bone 2.

[0075] See Figure 1 and Figure 2 In one embodiment, the middle portion 22 of the through-type support bone 2 extends downward from the interior of the arch region 12 to the bottom of the arch region 12, so that the bottom surface of the through-type support bone 2 is exposed on the bottom surface of the arch region 12. The through-type support bone 2 passes through the bottom of the arch region 12, so that the through-type support bone 2 occupies a complete cross section from top to bottom in the height direction of the arch region 12, thereby forming a rigid support area in the arch region 12 that runs through the thickness direction of the outsole body 1. When the arch region 12 is subjected to torsional load during child exercise, the through-type support bone 2 provides direct structural support from the bottom of the arch region 12, distributing the torsional load along the length direction of the through-type support bone 2 to the forefoot region 11 and the heel region 13, avoiding the torsional load from being concentrated on a local area of ​​the arch region 12, which would cause excessive deformation of the outsole body 1. Meanwhile, after the through-type support bone 2 passes through the bottom of the arch area 12, its bottom surface corresponds to the position of the open arc groove 54 of the anti-slip layer 5, so that the bottom of the through-type support bone 2 is exposed through the open arc groove 54. When children exercise, the bottom of the through-type support bone 2 can directly contact or approach the ground, further improving the anti-torsion response speed of the arch area 12.

[0076] In other embodiments, the middle portion 22 of the through-type support bone 2 may only pass through a portion of the bottom of the arch region 12, for example, only through the middle portion 22 of the arch region 12 in the width direction, as long as the through-type support bone 2 can provide anti-torsional support to the arch region 12 from the bottom position of the arch region 12.

[0077] The working principle of the flexible, through-type TPU anti-torsion outsole for children's sports shoes disclosed in this application is as follows: This application constructs a children's sports shoe outsole system with a through-type support bone 2 as the core of whole-foot mechanical transmission and multi-structure collaboration as the guarantee. Through the rigidity difference of materials, mechanical optimization of cross-sectional shape, structural adaptation of zoned functions and the synergistic cooperation of auxiliary structures, the outsole of children's sports shoes achieves the unity of bending flexibility, torsional stability and kinetic energy recovery efficiency.

[0078] When a child exercises wearing this outsole, the impact force generated by the heel striking the ground first acts on the second support part 25. The second support part 25 undergoes elastic deformation to store energy. At the same time, the through-type support bone 2 transmits part of the impact force forward along its length to the arch area 12. The middle part 22 of the arch area 12 provides support by conforming to the arch curve through the arc part 221. The through part 222 reserves space for the movement of the arch muscles, while the part passing through the bottom of the arch area 12 distributes the torsional load to the forefoot area 11 and the heel area 13. When the forefoot area 11 pushes off the ground, the first support part 24 restricts the lateral displacement of the forefoot from both sides, the flexure part 14 guides the outsole to bend in a predetermined position, and the second support part 25 releases the stored elastic potential energy to drive the foot to roll forward, completing the kinetic energy recovery. The above process is repeated in each step of movement, realizing the whole-foot mechanical transmission and energy recycling.

[0079] The through-type support bone 2 runs through the arch area 12 along its length and extends to the forefoot and heel, eliminating the interruption of force transmission caused by local embedding and ensuring even force distribution on the foot; the anterior end 21 is provided with a first wing-shaped support plate 241 that extends to the metatarsophalangeal joint flexion position, laterally restraining forefoot displacement, reducing the risk of ankle sprains, and does not affect natural flexion; the I-shaped cross section, combined with the arc-shaped protrusion, hollow holes, and structure passing through the bottom, improves torsional stiffness, conforms to the arch curve, and leaves room for development; the posterior end 23 is provided with a second wing-shaped support plate 251. Furthermore, its thickness allows it to absorb impact energy upon landing and convert it into forward kinetic energy, reducing exercise fatigue. The forefoot area 11 features multiple arc-shaped grooves to match the bending position with the metatarsophalangeal joint, reducing bending resistance. The mating surface features a concave-convex interlocking structure 3, which uses mechanical interlocking to compensate for insufficient adhesive bonding and extend service life. The support bone edge features a rounded corner structure 4 to prevent scratching children's skin and reduce stress cracks. The rubber anti-slip layer 5, combined with zoned protrusions and open arc-shaped grooves 54, adapts to the grip needs of the forefoot and heel without interfering with bending and kinetic energy recovery.

[0080] This application addresses several technical issues: First, the problem of poor support coordination. Local TPU structures cannot achieve full-length mechanical transmission, and forefoot stability and midfoot torsional rigidity are independent. This solution uses a through-type support bone 2 to link the forefoot, arch, and heel areas, forming a full-length coordinated support system. Second, the problem of insufficient energy recovery. Existing children's outsoles lack suitable energy recovery designs. This solution uses the elastic deformation of the second wing-shaped support plate 251 in the heel area 13 to convert landing impact into forward kinetic energy. Furthermore, the structure is compact, with gentle elastic feedback, suitable for children's exercise intensity. Third, the problem of the contradiction between bending and rigidity. The problems include: 1) Overly pursuing torsional rigidity leading to a stiff sole, or excessive flexibility leading to insufficient torsional rigidity. This solution uses an I-shaped cross-section to ensure torsional rigidity, while reducing bending resistance through the bend section 14, achieving a balance between the two. 2) The problem of weak material bonding. TPU is not tightly bonded to the main sole material and is prone to detachment after long-term use. This solution uses a concave-convex interlocking structure 3 to form a mechanical interlock, compensating for insufficient adhesive strength. 3) The problem of interference between anti-slip and function. The continuous coverage of the anti-slip layer 5 restricts forefoot bending and heel elastic deformation. This solution uses an open arc-shaped groove 54 to create a break in the anti-slip layer 5 at the bending line, eliminating interference.

[0081] The through-type support bone 2 forms a full-length mechanical transmission skeleton within the outsole body 1, linking forefoot stability and heel kinetic energy recovery to form a synergistic support system. This ensures even force distribution on the child's foot during exercise, effectively reducing the risk of ankle sprains and strains. At the same time, the one-piece molding structure eliminates the risk of detachment caused by partial inlays. The I-shaped cross-section enhances bending and torsional resistance. The arc-shaped part 221 and the through part 222 conform to the arch curve of the foot to provide appropriate support. The flexural part 14 reduces forefoot bending resistance. The concave-convex interlocking structure 3 and the rounded corner structure 4 enhance the bonding firmness and safety of use. The anti-slip layer 5 improves grip.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A flexible, through-type TPU anti-torsion outsole for children's sports shoes, characterized in that: The system includes a sole body (1) and a through-type support bone (2). The sole body (1) has a forefoot area (11), an arch area (12), and a heel area (13). The sole body (1) is made of a first material, and the through-type support bone (2) is made of a second material, the second material having a higher rigidity than the first material. The through-type support bone (2) is disposed along the length of the sole body (1) on the arch area (12) of the sole body (1). The through-type support bone (2) is a one-piece molded structure. The device includes a front end (21) in the forefoot area (11), a middle part (22) in the arch area (12), and a rear end (23) in the heel area (13). The front end (21) is provided with a first support part (24) and is flush with the bottom of the forefoot area (11) to enhance the lateral support force of the forefoot. The rear end (23) is provided with a second support part (25) and the second support part (25) is located between the bottom and top of the heel area (13) in the height direction of the heel area (13) to convert the impact force into forward kinetic energy.

2. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The first material is an elastomer material, and the second material is a rigid support material.

3. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The cross-section of the through-type support bone (2) is I-shaped, which is used to improve both longitudinal bending resistance and lateral torsional resistance at the same time.

4. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The middle part (22) of the through-type support bone (2) is provided with an arc-shaped part (221) facing the arch of the foot. A through part (222) is provided on the arc-shaped part (221). The arc-shaped part (221) and the through part (222) cooperate to fit the curve of the child's arch and provide appropriate support.

5. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The bottom of the outsole body (1) is provided with multiple bends (14) at intervals along the length direction. The bends (14) are located in the forefoot area (11) to reduce the exercise burden when the forefoot of a child bends.

6. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The first support portion (24) on the front end (21) extends to the metatarsophalangeal joint flexion position of the forefoot area (11); the second support portion (25) extends along the rear end (23) in a direction away from the arch area (12), and one end of the second support portion (25) away from the arch area (12) extends to the upper middle part of the heel area (13).

7. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The thickness of the first support part (24) is less than the thickness of the second support part (25).

8. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The first support portion (24) includes a wing-shaped support piece that extends outward from both sides of the front end portion (21).

9. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 2, characterized in that: The second support portion (25) includes a wing-shaped support piece that extends outward from both sides of the rear end portion (23).

10. The torsional outsole of the children's sports shoe with flexible, through-type TPU as described in claim 1, characterized in that: The through-type support bone (2) and the base body (1) are provided with a concave-convex interlocking structure (3); the edge of the through-type support bone (2) is provided with a rounded corner structure (4).

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