Forefoot flexing stiffness adaptive sole and adaptive running shoe

Abstract

The present application provides an adaptive shoe sole and adaptive running shoes which can provide the best forefoot bending stiffness according to the needs of the wearer in different states, the adaptive running shoes comprising a shoe sole body and an upper arranged on the shoe sole body, and further comprising an adaptive structure capable of automatically adjusting the resistance bending force generated to the forefoot bending of the wearer to achieve the best forefoot bending stiffness, the adaptive structure being an adaptive resistance bending force structure layer arranged in the forefoot of the shoe sole body and an external shell, and a cavity for wrapping and sealing the adaptive resistance bending force structure layer is arranged in the external shell.

Description

Technical Field

[0001] This invention relates to the field of footwear technology, and in particular to an adaptive forefoot flexural stiffness sole and an adaptive running shoe. Background Technology

[0002] Traditional running shoes have very low forefoot flexural stiffness, as shown in the attached image. Figure 1 As shown, during the landing phase of running, the maximum flexion angle of the metatarsophalangeal joint is similar to that of the bare foot, which is not conducive to the work of the plantar flexor muscles and tendons, resulting in weak tendon energy feedback. Scientific research has found that increasing the forefoot flexion stiffness can optimize the working conditions of the plantar flexor muscles and tendons, increase tendon energy feedback, and enhance the stiffness of the metatarsophalangeal (MTP) joint, reducing negative work and increasing positive work, thereby saving energy consumption and improving running performance. Therefore, to compensate for the above shortcomings, existing running shoes embed carbon plates in the midsole, also known as carbon plate running shoes. Carbon plate running shoes can greatly improve... The flexion stiffness of the forefoot reduces the flexion angle of the metatarsophalangeal joint, thus straightening it. However, the flexion stiffness of the forefoot is not always better the greater it is; it is related to factors such as the wearer's weight, running speed, and the strength-length relationship of the plantar flexors. In other words, different wearers require different optimal forefoot flexion stiffness under the same exercise conditions, and the same wearer also requires different optimal forefoot flexion stiffness under different exercise conditions. Current carbon plate running shoes cannot meet the varying needs of wearers for forefoot flexion stiffness. Summary of the Invention

[0003] Therefore, in response to the above problems, the present invention proposes an adaptive sole and adaptive running shoes that can automatically adjust the flexural force of the forefoot of the wearer according to the wearer's needs in different states to achieve the optimal forefoot flexural stiffness.

[0004] To achieve the above objectives, the technical solution of the present invention is to provide an adaptive forefoot flexural stiffness sole, including a sole body and an adaptive structure that can automatically adjust to generate anti-flexural force on the forefoot of the wearer's foot as the wearer runs and lands, thereby achieving optimal forefoot flexural stiffness. The adaptive structure consists of an adaptive anti-flexural force structure layer and an outer shell disposed on the forefoot part of the sole body, and the outer shell is provided with a cavity for enclosing and sealing the adaptive anti-flexural force structure layer.

[0005] A further improvement is that a rigid sheet is disposed within the cavity, the rigid sheet being wavy in shape with grooves, and the adaptive anti-flexural structure layer covering the rigid sheet.

[0006] A further improvement is that the cavity is wavy with grooves.

[0007] A further improvement is that the material of the adaptive anti-flexural structure layer is polyborosiloxane (PBDMS).

[0008] An adaptive forefoot flexural stiffness running shoe includes a sole body and an upper disposed on the sole body. It also includes an adaptive structure that can automatically adjust to generate anti-flexural force on the forefoot of the wearer's foot to achieve optimal forefoot flexural stiffness as the wearer lands while running. The adaptive structure consists of an adaptive anti-flexural force structure layer disposed on the forefoot of the sole body and an outer shell. The outer shell has a cavity for enclosing and sealing the adaptive anti-flexural force structure layer.

[0009] A further improvement is that a rigid sheet is disposed within the cavity, the rigid sheet being wavy in shape with grooves, and the adaptive anti-flexural structure layer covering the rigid sheet.

[0010] A further improvement is that the cavity is wavy with grooves.

[0011] A further improvement is that the material of the adaptive anti-flexural structure layer is polyborosiloxane (PBDMS).

[0012] A further improvement is that the material of the outer shell includes any one or more of PVC, YPU, PU, ​​TPEE, and nylon elastomer mixed in any proportion.

[0013] A further improvement is that the material of the hard sheet is either carbon fiber or TPU.

[0014] The advantages and beneficial effects of the present invention are as follows: The sole body of the present invention is provided with an adaptive anti-flexural structure layer. Compared with the existing carbon plate running shoes, which provide unchanging bending stiffness for the forefoot, the running shoes provided by the present invention can provide adaptive forefoot bending stiffness according to the wearer's movement changes, so that the wearer can have better athletic performance and a more comfortable wearing experience.

[0015] Furthermore, the adaptive anti-flexural structure layer in this invention is made of polyborosiloxane PBDMS, and the adaptive anti-flexural structure layer is made into a wave shape by means of cavity shape or rigid plate shape. The wave-shaped polyborosiloxane PBDMS realizes the strain of flexural force, realizes the response to bending and torsion movements, and instantaneous force change, providing the best bending stiffness for the forefoot, reducing the contraction speed of the calf triceps, thereby achieving the effect of saving energy consumption and improving the running performance of the wearer. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating the flexed position of the foot inside a traditional running shoe when running.

[0017] Figure 2A comparison diagram of the forces experienced by ordinary shoe a and shoe b with increased forefoot flexural stiffness at the same speed.

[0018] Figure 3 This is a schematic diagram of the decomposed structure of the adaptive structure in Embodiment 1 of the present invention.

[0019] Figure 4 This is a schematic diagram of the forces acting on the adaptive structure in Embodiment 1 of the present invention.

[0020] Figure 5 Force diagram of the adaptive structure in Embodiment 2 of the present invention

[0021] Figure 6 A schematic diagram of the metatarsophalangeal joint. Implementation

[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention. Example

[0023] like Figure 3 , Figure 4 As shown, the forefoot flexural stiffness adaptive running shoe includes a sole body (not shown in the figure) and an upper (not shown in the figure) disposed on the sole body. It also includes an adaptive structure 1 that automatically adjusts to generate anti-flexural force against the forefoot flexion as the wearer lands while running, thereby achieving optimal forefoot flexural stiffness. The adaptive structure 1 is disposed in the forefoot portion of the sole body and consists of an outer shell 2 made of PVC and an adaptive anti-flexural force structure layer 3. The outer shell 2 contains a cavity 4, with protrusions 5 located at both the top and bottom of the cavity 4. The upper and lower protrusions 5 are staggered, forming a wave-like pattern with grooves within the cavity 4. The adaptive anti-flexural force structure layer 3 is made of polyborosiloxane (PBDM), a rheologically active polymer smart material. S, because polyborosiloxane (PBDMS) exhibits a fluid dynamic at low strain rates, during fabrication, the fluid PBDMS is injected to fill the cavity 4, forming the adaptive flexural strength-resistant structural layer 3. The injection port is then sealed, allowing the cavity 4 to enclose and seal the adaptive flexural strength-resistant structural layer 3. The adaptive flexural strength-resistant structural layer 3 naturally forms a wave shape following the shape of the cavity 4. Since PBDMS is only sensitive to positive compressive stress, as the deflection angle increases, the positive pressure on a non-wave-shaped structure decreases, preventing the PBDMS from hardening and achieving the adaptive effect. However, the wave-shaped structure, even with a larger deflection angle, always maintains positive pressure, allowing the PBDMS to exert its compressive stress-sensitive properties and thus achieve self-adaptation.

[0024] For the reasons mentioned above, the wave-shaped polyborosiloxane (PBDMS) can adapt to flexural forces and respond to bending and torsional movements, exhibiting characteristics of instantaneous force changes. Therefore, when the wearer uses the running shoes provided by this invention, the deformation rate of the adaptive structure 1 located in the forefoot of the running shoe accelerates with the foot landing action within a short time period. Under high strain rate, the wave-shaped adaptive anti-flexural structure layer 3 made of PBDMS quickly hardens, providing anti-flexural force for forefoot bending, thereby providing optimal bending stiffness for the forefoot. (Reference) Figure 2 In scenario b, the lever arm of the ankle joint increases, which slows down the angular velocity of plantar flexion and reduces the contraction speed of the calf triceps, thereby conserving energy. (See reference...) Figure 6 A comparison of MTP (metatarsophalangeal joint) biomechanical parameters between ordinary shoes (control, blue line) and shoes with increased forefoot flexion stiffness (stiff, red line). The vertical axis represents joint power (watts / kg), and the horizontal axis represents the gait cycle from foot strike to re-strike. Wearing shoes with increased forefoot flexion stiffness can reduce the joint extension angle, decrease joint angular velocity, maintain joint torque, reduce joint negative work, and increase joint positive work (the area enclosed by joint power and the horizontal axis; below the horizontal axis represents negative work, and above it represents positive work).

[0025] Furthermore, since the process of the adaptive anti-flexural structure layer 3 changing from a fluid dynamic to a solid state is generated along with the wearer's movement, compared with the existing carbon plate running shoes whose forefoot flexural stiffness is not changeable, the running shoes provided by this invention can provide adaptive forefoot flexural stiffness according to the wearer's movement changes, so that the wearer can have better athletic performance and a more comfortable wearing experience. Example

[0026] like Figure 5As shown, the forefoot flexural stiffness adaptive running shoe includes a sole body (not shown in the figure) and an upper (not shown in the figure) disposed on the sole body. It also includes an adaptive structure 1 that automatically adjusts to generate anti-flexural force against the forefoot flexion as the wearer lands while running, thereby achieving optimal forefoot flexural stiffness. The adaptive structure 1 is disposed in the forefoot portion of the sole body and consists of an outer shell 2 made of PVC and an adaptive anti-flexural structure layer 3. The outer shell 2 has a cavity 4, and the cavity 4 contains a rigid sheet 6, which is a carbon fiber plate with a wave-like shape featuring grooves. The adaptive anti-flexural structure layer 3 is made of polyborosiloxane (PBDMS), a rheologically active polymer smart material. Because PBDMS exhibits high resistance to flexural stress at low strain rates... The following describes the process of fabricating a fluid dynamic polyborosiloxane (PBDMS). During fabrication, the fluid dynamic PBDMS is injected into the cavity 4, filling it completely. The injection port is then sealed, sealing the cavity 4. At this point, the PBDMS coats the rigid sheet 6, forming the adaptive flexural strength-resistant structural layer 3. The contact surface between the adaptive flexural strength-resistant structural layer 3 and the rigid sheet 6 naturally forms a wave shape following the shape of the rigid sheet 6. Because PBDMS is only sensitive to positive compressive stress, as the deflection angle increases, the positive pressure on a non-wave-shaped structure decreases, preventing the PBDMS from hardening and achieving the adaptive effect. However, the wave-shaped structure, even with a larger deflection angle, always maintains positive pressure, allowing the PBDMS to exert its compressive stress-sensitive properties and thus achieve self-adaptation.

[0027] For the reasons mentioned above, the wave-shaped polyborosiloxane (PBDMS) can adapt to flexural forces and respond to bending and torsional movements, exhibiting characteristics of instantaneous force changes. Therefore, when the wearer uses the running shoes provided by this invention, the deformation rate of the adaptive structure 1 located in the forefoot of the running shoe accelerates with the foot landing action within a short time period. Under high strain rate, the wave-shaped adaptive anti-flexural structure layer 3 made of PBDMS quickly hardens, providing anti-flexural force for forefoot bending, thereby providing optimal bending stiffness for the forefoot. (Reference) Figure 2 In scenario b, the lever arm of the ankle joint increases, which slows down the angular velocity of plantar flexion and reduces the contraction speed of the calf triceps, thereby conserving energy. (See reference...) Figure 6A comparison of MTP (metatarsophalangeal joint) biomechanical parameters between ordinary shoes (control, blue line) and shoes with increased forefoot flexion stiffness (stiff, red line). The vertical axis represents joint power (watts / kg), and the horizontal axis represents the gait cycle from foot strike to re-strike. Wearing shoes with increased forefoot flexion stiffness can reduce the joint extension angle, decrease joint angular velocity, maintain joint torque, reduce joint negative work, and increase joint positive work (the area enclosed by joint power and the horizontal axis; below the horizontal axis represents negative work, and above it represents positive work).

[0028] Furthermore, since the process of the adaptive anti-flexural structure layer 3 changing from a fluid dynamic to a solid state is generated along with the wearer's movement, compared with the existing carbon plate running shoes whose forefoot flexural stiffness is not changeable, the running shoes provided by this invention can provide adaptive forefoot flexural stiffness according to the wearer's movement changes, so that the wearer can have better athletic performance and a more comfortable wearing experience.

[0029] According to the aforementioned embodiments, the material of the outer shell 2 can also be any one of YPU, PU, ​​TPEE, or nylon elastomer.

[0030] According to the aforementioned embodiments, the material of the hard sheet 6 can also be TPU.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A forefoot flexural stiffness adaptive sole, comprising a sole body, characterized in that: It also includes an adaptive structure that can automatically adjust to generate anti-flexural force on the forefoot of the wearer as they run and land, thereby achieving optimal forefoot flexural stiffness. The adaptive structure consists of an adaptive anti-flexural force structure layer and an outer shell set in the forefoot of the sole body. The outer shell has a cavity for enclosing and sealing the adaptive anti-flexural force structure layer. The cavity is provided with a rigid sheet, which is wavy in shape with grooves, and the adaptive anti-flexural structure layer covers the rigid sheet. The cavity is wavy with grooves.

2. The forefoot flexural stiffness adaptive sole according to claim 1, characterized in that: The adaptive anti-flexural structure layer is made of polyborosiloxane (PBDMS).

3. A forefoot flexural stiffness adaptive running shoe, comprising a sole body and an upper disposed on the sole body, characterized in that: It also includes an adaptive structure that can automatically adjust to generate anti-flexural force on the forefoot of the wearer as they run and land, thereby achieving optimal forefoot flexural stiffness. The adaptive structure consists of an adaptive anti-flexural force structure layer and an outer shell set in the forefoot of the sole body. The outer shell has a cavity for enclosing and sealing the adaptive anti-flexural force structure layer. The cavity is provided with a rigid sheet, which is wavy in shape with grooves, and the adaptive anti-flexural structure layer covers the rigid sheet. The cavity is wavy with grooves.

4. The forefoot flexural stiffness adaptive running shoe according to claim 3, characterized in that: The adaptive anti-flexural structure layer is made of polyborosiloxane (PBDMS).

5. The forefoot flexural stiffness adaptive running shoe according to claim 4, characterized in that: The material of the outer shell includes any one or more of PVC, YPU, PU, ​​TPEE, and nylon elastomer mixed in any proportion.

6. The forefoot flexural stiffness adaptive running shoe according to claim 3, characterized in that: The material of the rigid sheet is either carbon fiber or TPU.

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