Multi-stage linkage and composite locking zero-convex flat and high heel conversion shoe and mechanical conversion and midsole reset system of multi-stage linkage and composite locking zero-convex flat and high heel conversion shoe

Abstract

The invention relates to the field of shoe design, and provides a multi-stage linkage and composite locking zero-outward-convex flat and high heel conversion shoe and a mechanical conversion and insole reset system of the multi-stage linkage and composite locking zero-outward-convex flat and high heel conversion shoe. In order to solve the problems that in the prior art, high heel switching efficiency is low, insole supporting is insufficient, and the appearance is abrupt, accurate switching between a high heel and a flat heel is achieved through the fixing frame assembly, efficient switching is achieved through multi-stage linkage, and stability is ensured through the composite locking design. The zero-convex storage heel keeps flat in appearance in a flat heel mode; the mechanical conversion system is in linkage with a connecting block through an S-shaped connecting rod to drive the insole reset system to slide automatically, the foot supporting form is adjusted, a bionic foot arch is formed in a high heel mode, and self-adaptive flattening is achieved in a flat heel mode. According to the dual-purpose shoe, the switching efficiency, the foot comfort and the appearance attractiveness are remarkably improved, and the supporting problem of traditional dual-purpose shoes is thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shoe design and manufacturing, and particularly relates to a zero-outward convex high-flat shoe based on multi-stage linkage and composite locking, and its mechanical conversion and midsole reset system. The invention realizes seamless switching between high and flat heel modes through a mechanical conversion system, and uses the midsole reset system to automatically represent foot support, aiming to improve the switching efficiency, wearing comfort and appearance of shoes, and belongs to the cross-application of shoe structure design and mechanical linkage technology. Background Art

[0002] Recently, with the continuous development of fashion and functional requirements, the shoe design field has put forward higher requirements for the innovation of high heels and flat shoes. The heel height and shape of traditional high heels are fixed, and long-term wearing may cause unhealthy foot problems.

[0003] Traditional flat shoes are favored for improving comfort, but lack the fashion sense and visual enhancement effect of high heels. Therefore, there is a need in the market for a shoe product that can balance the fashionability and visual advantages of high heels and the comfort of flat shoes.

[0004] In the prior art, there have been some attempts to achieve the conversion between high heels and flat shoes by adjusting the heel height or perceiving the heel. For example: Chinese Patent Document CN202220871879 discloses a folding high heel. The design of a strong magnet cooperating with a clamping groove and the structure of an internal guiding hemisphere cooperating with a lifting groove make the folding heel fold smoothly, but this design does not solve the problem of midsole support. These prior arts have deficiencies in operation efficiency, biomechanical support and structural encapsulation: traditional designs rely on multiple operations or external setting components, resulting in inconvenient step switching and operation; there is a lack of dynamic power between midsole support and heel height change, causing foot pressure imbalance; the locking mechanism is prone to failure and weakening in a hot and humid environment; space or components are exposed during the process, affecting the appearance aesthetics.

[0005] Therefore, an improved solution is needed to improve the switching efficiency, wearing comfort and appearance defects of shoes. Summary of the Invention

[0006] (I) Technical Problems to be Solved The present invention aims to solve the technical problems in the existing shoe conversion technology.

[0007] First of all, the operation efficiency of traditional high heels and flat designs is low, relying on multiple switching steps for manual adjustment, with long operation time and inconvenience.

[0008] Secondly, the midsole support cannot dynamically cooperate with the shoe height change, resulting in foot pressure imbalance and affecting wearing comfort.

[0009] In addition, there is often space or exposed parts when the heel is received, which destroys the streamlined appearance.

[0010] To this end, the present invention improves efficiency through multi-stage linkage, enhances stability through composite locking, and automatically generates foot support through the midsole reset system, aiming to overcome the problems of operational complexity, insufficient support, high efficiency defects and impossibility of realization, thereby achieving a shoe design with good appearance, comfort and beauty. (II) Technical solution In view of the above technical issues, the present invention provides a zero-external-convex flat-high-heel conversion shoe based on multi-stage linkage and locking composite fixing and a mechanical conversion and midsole resetting system thereof.

[0011] The system achieves seamless switching of heel height through purely mechanical design, which mainly includes multi-layer linkage transmission mechanism, composite locking components, midsole dynamic modification system and zero convex receiving design.

[0012] Multi-stage linkage transmission mechanism: four-link design and spring loading, heel rotation switching is achieved through a single trigger, and the auxiliary compensation shaft and double-link system of the mechanism ensure stable motion trajectory and eliminate offset.

[0013] Composite locking assembly: Utilizes a dual latch structure and gear transmission optimization design, combined with self-locking and elastic preload, to provide multi-dimensional stability in high heel mode, while reducing operating force for increased convenience.

[0014] Midsole Dynamic Cage System: Through multi-level linkage and coordination of gradient materials, it dynamically adjusts arch support and balances foot pressure distribution in high-heel and flat modes.

[0015] Zero-convex storage design: The deep-matched embedded groove and sealed protection mechanism are used to completely store the heel into the sole, achieving a flat appearance in the folded state and reliability in hot and humid environments.

[0016] The above devices jointly solve the contradiction between operating efficiency, biomechanical performance and structural packaging, and improve the switching efficiency, wearing comfort and appearance of footwear.

[0017] (III) Beneficial effects The present invention realizes efficient and stable seamless compound switching of the heel through multi-stage linkage and composite locking design, significantly improves operating efficiency and convenience, and completely solves the problem of long traditional switching action.

[0018] The locking system combines button latching and self-locking mechanisms to enhance stability and interaction in heel-height mode, maintaining long-term reliability in complex environments.

[0019] The midsole reset system automatically slides into position, dynamically adjusts the foot shape, forms a bionic arch in high-heel mode, and adaptively flattens in flat-heel mode, optimizing foot pressure distribution and improving wearing comfort.

[0020] The zero-outward convex storage design ensures a flat appearance in the folded state, overcoming the defect of the abrupt appearance in the traditional technology.

[0021] The present invention takes into account the switching efficiency, biomechanical support, shape and aesthetics, comprehensively improving the functions of shoes and the user experience. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall appearance of the present invention in the high-heel mode, showing the overall structure of the shoe body main body and the assembly relationship of the main components.

[0023] Figure 2 Schematic diagram of the internal structure of the zero-outward convex storage heel Figure 3 It is a side view of the present invention in the flat-heel mode Figure 4 It is a sectional view of the present invention with the zero-outward convex storage heel opened, showing the connection state of the high-heel storage and the fixing frame assembly Figure 5 It is a side view of the present invention in the high-heel mode Figure 6 It is an exploded schematic diagram of the fixing frame assembly, showing the internal structure and linkage relationship of the fixing frame assembly.

[0024] Figure 7 It is a partial enlarged view of the composite locking system, showing the locking state in the high-heel mode.

[0025] Figure 8 It is a partial enlarged view of the deformation disassembly mode of the composite locking system, showing that heels of different shapes can be disassembled and installed in the high-heel mode Figure 9 It is a front bottom view of the midsole dynamic reset system in the high-heel mode, showing the static form of the midsole. Figure 10 It is a front bottom view of the midsole dynamic reset system in the flat-heel mode, showing the flattened state of the midsole dynamic reset system in the flat-heel mode.

[0026] Figure 11 : Schematic diagram of the regional structure of the shoe outsole Figure 12 : Detail drawing of the elastic design of the forefoot shock absorption area Figure 13 : Schematic diagram of another detachable heel system, showing the structure of another detachable heel system and its cooperation relationship with the midsole reset system.

[0027] In the figure:

[100] Shoe body main body;

[110] - Zero outward convex receiving heel;

[111] - Through hole;

[112] - Zero outward convex heel internal storage groove;

[113] - Zero outward convex receiving heel card slot;

[120] - High heel; [120-1] - Shoe heel rubber pad; [120-3] Replaceable high heel style 1; [120-4] Replaceable high heel style 2;

[130] - Gradient linkage shoe sole; [131-1] - Rubber silicone material; [131-2] - Memory foam layer;

[132] - Rear heel support area, carbon fiber rubber material;

[140] - Fixed buckle;

[200] - Fixed frame assembly; [120-2] - Rubber pad;

[210] - Arc-shaped sliding groove;

[220] - Fixed groove;

[230] - Extension part;

[240] - Transmission block;

[250] - Fixed gear;

[260] - Moving gear;

[270] - S-shaped connecting rod;

[280] - Latch;

[281] - Spring;

[282] - Circular fixing pin;

[283] - Locking mechanism block; [283-1] Locking mechanism block deformed spiral (may also be any disassembly device);

[300] Shoe sole (another group of detachable high heels); [300-A] Front section of the shoe; [300-B] Middle section of the shoe; [300-C] Rear section of the shoe;

[310] High heel;

[320] Hinge mechanism (supports the folding and unfolding of the high heel part

[310] );

[330] Triangular support: (forms a triangular structure with the hinge mechanism

[320] and the high heel part

[310] in high heel mode to provide additional support);

[400] - Midsole; [400-1] - Support track (embedded in the midsole structure

[400] and used as the sliding track for 271);

[410] - Midsole support plate;

[420] - Midsole buckle (locks and releases the

[410] mechanism). Detailed implementation mode

[0028] This specific mode details an implementation method of a zero-outward-convex flat-high heel conversion shoe and a mechanical conversion and midsole reset system based on multi-stage linkage and composite locking. It realizes the description switching between high heels and flat forms through pure mechanical design. The main shoes include a body main body, a fixed frame assembly, and a direct linkage shoe sole, aiming to improve operation efficiency, foot comfort, and appearance aesthetics. The structure, function, and operation principle of each part are described as follows.

[0029] Shoe body main body

[100] Figure 1This is an exemplary configuration of the zero-outward-protrusion flat-to-high heel conversion shoe with multi-stage linkage and composite locking, as well as its mechanical conversion and midsole reset system of the present invention, aiming to help understand the features and functions of the present invention. The present invention is not limited to the shown architecture or configuration, and various alternative architectures and configurations can be adopted. The features and functions described in different exemplary embodiments can be used alone or in combination for other embodiments of the present invention, not limited to the specific embodiments described.

[0030] As Figure 1 shown, the shoe body main body

[100] includes a shoe outsole

[130] , a high heel

[120] , a zero-outward-protrusion storage heel

[110] , and a fixing frame assembly

[200] . The shoe outsole

[130] is the sole basic structure, integrating slightly functions and linkage mechanisms, and is made of special elastic rubber. The high heel

[120] is made of aluminum alloy (the height can be switched to 50mm, 70mm or 90mm), and all the hardware components at the bottom are made of the same material to ensure light weight, rapidity, wear resistance and abrasion resistance.

[0031] As Figure 2 shown, the zero-outward-protrusion storage heel

[110] is a groove-shaped structure with a storage groove

[112] inside for storing the high heel

[120] ; a through hole

[111] is provided at its bottom for the lower end of the high heel

[120] to penetrate through. As Figure 4 shown, a fixing frame assembly

[200] and a fixing buckle

[140] are fixed on the lower surface of the shoe outsole

[130] . The fixing frame assembly

[200] is a key mechanical component of the composite locking system, designed as a rectangular boss structure. As an independent mechanical component, it integrates guiding, locking and high-heel switching support functions, is made of aluminum alloy, and its surface is anodized to achieve light weight and withstand the dynamic screws during the switching process, providing excellent wear resistance and corrosion resistance.

[0032] The fixing buckle

[140] is a small locking tolerance structure of a composite material of an inverted triangular column and a cylinder, positioning the rectangle of the shoe outsole

[130] and the fixing frame assembly

[200] , and enhancing the clamping tightness. When in use, the zero-outward-protrusion storage heel

[110] is pushed upward, and the fixing buckle

[140] is inserted into the card slot

[113] of the zero-outward-protrusion storage heel

[110] , and tight clamping is achieved through the geometric constraint of the card slot of the inverted triangular column and the friction force of the cylinder, ensuring that the zero-outward-protrusion storage heel

[110] is quickly fixed to the shoe outsole

[130] .

[0033] As Figure 3 shown, in the flat heel mode, the high heel

[120] is parallel to the lower surface of the shoe outsole

[130] and is received in the zero-outward-protrusion storage heel

[110] ; As Figure 5 In the high heel mode, the high heel

[120] is perpendicular to the lower surface of the shoe outsole

[130] , and the lower end penetrates through the through hole

[111] to form a support.

[0034] As Figure 6 shown, the upper end of the fixing frame assembly

[200] is fixed to the lower surface of the shoe outsole

[130] , designed as a rectangular boss structure, which is used to support the shape switching of the high heel

[120] , and ensure the stability of the high heel mode and the accuracy of switching through the composite latch locking system. The fixing frame assembly

[200] includes the following main components: Extension part

[230] : The wall thickness is 1.5 ± 0.1 mm, with stress dispersion ribs built-in to enhance the structural strength.

[0035] Arc-shaped chute

[210] : The radius of curvature is R15 mm, and the surface is coated with a PTFE coating to reduce the frictional resistance.

[0036] Rotating block

[240] : Made of aluminum alloy 6061-T6, the assembly clearance is ≤ 0.05 mm, and the surface is anodized to improve wear resistance.

[0037] The rotating block

[240] is installed in the arc-shaped chute

[210] through a rotating shaft. One end of the rotating shaft is fixedly connected to the moving gear

[260] . Fixed gears

[250] are rotatably arranged on both side walls of the fixing frame

[200] . The end of the rotating block

[240] is connected to the high heel

[120] . Through the meshing transmission of the fixed gear

[250] and the moving gear

[260] , and the track restriction of the arc-shaped chute

[210] , the accurate positioning and switching of the high heel

[120] between the horizontal (flat heel) and vertical (high heel) states are realized.

[0038] As Figure 7 shown, the composite latch locking system adopts a double insurance design to ensure the multi-dimensional stability of the high heel

[120] in the vertical state. The main latch mechanism includes the following components: Latch

[280] : Made of aluminum alloy 6061-T6, with a thickness of 1.2 mm and a strong structure. Spring

[281] : The spring constant k = 0.6 N·mm / °, and the pre-tightening angle is 15° ± 1°, providing stable elastic force. Locking mechanism block

[283] : Used to hold the high heel

[120] in the high heel position, and the combination method with the high heel

[120] can be combined embedding or detachable (such as screw disassembly as Figure 8 shown) to meet different design requirements.

[0039] Circular fixing pin

[282] : Joined by the top of the locking mechanism

[283] to restrict the backward rotation of the high heel

[120] and prevent accidental unlocking.

[0040] Locking process: In high - heel mode, the latch

[280] is wedged into the groove on the locking mechanism block

[283] of the high - heel

[120] under the action of the spring

[281] , providing a reliable normal binding force (≥800N) using the wedge - locking principle. The circular fixing pin

[282] engages with the top of the locking mechanism

[283] , further restricting the rotation of the high - heel

[120] to ensure a stable locked state. The spring

[281] forces the latch

[280] to go as deep as possible into the groove, preventing any wobbling or swinging of the high - heel

[120] .

[0041] In flat - sole mode, the latch

[280] acts as a stopper, using the elastic force of the spring

[281] to hold it in the flat - sole position, preventing the high - heel

[120] from vibrating or shifting.

[0042] Release mechanism: To release the locked state, the user pushes the latch

[280] to move it out of the wedged position, the spring

[281] is released, the latch

[280] exits the groove, and the high - heel

[120] can rotate freely.

[0043] Additional stability design: As Figure 6 shown, the inner cavity of the fixing frame

[200] is provided with a fixing groove

[220] . The lower end of the rotating block

[240] is equipped with a rubber pad [120 - 2] (made of elastic material, the same as the material of the shoe sole

[130] ), which is embedded in the fixing groove

[220] to form a zero - clearance fit, enhancing the friction and practicality in the flat - heel state. In addition, the transmission mechanism optimizes the meshing angle and tooth profile through the helical gear set

[250] /

[260] to ensure that the power transmission efficiency ≥92%, guiding the high - heel

[120] to seamlessly switch to the flat - sole state along the preset trajectory. The high - heel

[120] can be connected to the locking mechanism block

[283] in the following two ways, and the user can choose according to needs: (1) Threaded connection: As Figure 8 shown, the high - heel

[120] is fixed to the locking mechanism block

[283] by threads, which is convenient for replacement or adjustment. The high - heel

[120] is fixed to the locking mechanism block

[283] by M6 threads, and the thread depth ≥8mm to ensure the connection strength; (2) Snap - in embedding: As Figure 7 shown, the high - heel

[120] is snap - in embedded into the locking mechanism block

[283] , and the snap - in tolerance ≤0.02mm, providing a quick installation and disassembly function, ensuring higher support and stability.

[0044] Both methods are acceptable. Threaded connection is suitable for scenarios where the high - heel

[120] needs to be replaced frequently, while snap - in embedding emphasizes more on structural stability. In flat - sole mode, the latch

[280] abuts against the bottom of the high - heel

[120] , preventing it from moving up and down or rotating, thus ensuring the stability of the flat - sole state.

[0045] As Figure 9 and Figure 10As shown, the midsole dynamic reset system realizes precise shape control of high heel

[120] and flat heel modes through aluminum alloy mechanical linkage and gradient material. The system includes a midsole structure

[400] , a midsole support track [400-1] (embedded in the midsole structure

[400] , as a sliding track for the 271 connecting block to slide), a midsole support plate

[410] , a midsole buckle

[420] (locking and releasing

[410] mechanism), an S-shaped connecting rod

[270] and a connecting block

[271] , and triggers the dynamic equipment through the root rotation of the fixed frame assembly

[200] . The linkage mechanism is composed of an S-shaped connecting rod

[270] and a connecting block

[271] that drives the sliding part of the midsole structure

[400] . The back of the midsole structure

[400] is embedded with a track that matches the size of the 271 connecting block to provide rigid support, and the connecting block

[271] slides along the support track [400-1]. The specific working principle is as follows: High heel mode ( Figure 9 ): The heel

[120] rotates 90° at the root, and the S-shaped connecting rod

[270] is triggered, pushing the connecting block

[271] to drive the midsole structure

[400] to slide smoothly under the action of gravity (the sliding distance is defined according to the shoe size, such as 10mm for size 36 and about 15mm for size 42). After the connecting block

[271] slides stably and smoothly on the inner support track [400-1] for a corresponding distance, it drives the midsole buckle

[420] to move backward synchronously and lock with the support plate

[410] to form a bionic arch bridge structure. The support plate

[410] acts as a reinforced bracket and cooperates with fatigue materials to achieve pressure dispersion, and the pressure on the sole of the foot increases by 28%.

[0046] The sponge shock-absorbing structure and invisible support in the middle of the sole further enhance stability. When unfolded, the 57° triangular mechanical structure enhances lateral stability by 2.3 times.

[0047] Flat heel mode ( Figure 10 ): The base of the high heel

[120] rotates in the opposite direction, and the S-shaped connecting rod

[270] pushes the connecting block

[271] to slide forward. After the connecting block

[271] slides forward stably for a corresponding distance in the support track [400-1], it presses against the support plate

[410] , drives the midsole slot

[420] to open and move forward, releases the locking state with the support plate

[410] , and releases the fixed width of the midsole. The forefoot supercritical rubber glue

[131] (rebound rate ≥ 70%) and the memory foam layer [131-2] are adaptively flattened to provide a natural flexion angle of 110°, and realize zero convex storage in the folded state (thickness 12mm).

[0048] The system drives the sliding part of the midsole structure

[400] through the mechanical linkage of the S-shaped connecting rod

[270] and the connecting block

[271] , combining the heavy-duty lightweight design and the biomechanical vision of the gradient material to achieve a technical balance between precise control of morphological switching and industrial aesthetics.

[0049] like Figure 11Figure 12 As shown, the gradient linkage shoe outsole

[130] is divided into a forefoot cushioning area

[131] and a heel support area

[132] . The forefoot cushioning area

[131] is divided into a forefoot cushioning area elastic material [131-1] rubber silicone material and a memory foam layer [131-2], and adopts high-elastic polyurethane rubber (rebound rate ≥ 60%, impact absorption rate 65%) to provide a soft and high-elastic wearing experience.

[0050] Heel support area

[132] : A skeleton structure made of carbon fiber reinforced rubber composite material (carbon fiber content 50%, compressive strength ≥ 120 MPa) is used to ensure support and stability in high heel mode.

[0051] High heel status( Figure 4 -- Figure 5 ): The user unlocks the fixing buckle

[140] by pressing the release button, releasing the fixed state of the zero-convex storage heel

[110] . The high heel

[120] is manually rotated to a vertical position, and the lower end passes through the through hole

[111] . The fixing buckle

[140] is re-inserted into the slot for fixing, and the midsole structure

[400] moves backward and locks to form arch support, improve stability in the high heel mode, and complete the mode switching.

[0052] Flat state( Figure 4 --- Figure 3 ): The high heel

[120] is parallel to the lower surface of the outsole

[130] and is received in the zero-convex receiving heel

[110] . The fixing buckle

[140] is embedded in the slot of the zero-convex receiving heel

[110] and is fixed by geometric constraints and friction.

[0053] The midsole structure

[400] naturally flattens under the action of the forefoot cushioning area

[131] to provide soft foot support, and the switching process takes about 3 seconds.

[0054] Similarly, by changing a set of disassembly heel system with midsole reset system, you can also freely use the principle to achieve integrated switching of high heels and midsole. In order to reflect the diversity of design and the wide applicability of the midsole restoration system, another set of descriptions of the disassembly and heel system can be added: Figure 13 As shown, the present invention provides another set of heel removal system, which is used in conjunction with the midsole restoration system to achieve an integrated switch between high heel and flat sole mode. The shoe outsole

[300] includes a shoe front section [300-A], a shoe middle section [300-B] and a shoe rear section [300-C]. The high heel

[310] is connected to the shoe outsole

[300] through a hinge mechanism

[320] and can be folded or removed. The user can press the release button on the hinge mechanism

[320] to fold the high heel

[310] from the unfolded state to the mid-shoe section [300-B] to convert it into a flat shoe. During the folding process, the triangular support member

[330] assists in forming a stable triangular structure.

[0055] In an alternative embodiment, the heel piece

[310] is completely detachable. In the high heel mode, the heel piece

[310] supports the rear section [300-C] of the shoe; in the flat sole mode, the heel piece

[310] can be removed or placed in the middle section [300-B] of the shoe The triangular support member

[330] is located at the rear of the rear section [300-C] of the shoe. When the heel piece

[310] is locked in the high heel mode, it forms a triangular support structure with the hinge mechanism

[320] to enhance the stability of the shoe. The midsole reset system includes an S-shaped connecting rod

[270] , a connecting block

[271] , and a midsole structure

[400] . When the heel piece

[310] is unfolded to a vertical state, the S-shaped connecting rod

[270] drives the midsole structure

[400] to slide backward through the connecting block

[271] to form an arch support; when the heel piece

[310] is folded or disassembled to a horizontal state, the S-shaped connecting rod

[270] pushes the midsole structure

[400] to slide forward to achieve adaptive flattening.

[0056] Similarly, with another set of detachable heel systems, the midsole reset system is equally applicable. Through the linkage of the S-shaped connecting rod

[270] and the heel piece

[310] , it realizes the automatic adjustment of the midsole structure

[400] in the high heel and flat sole modes, reflecting the diversity and wide applicability of the design.

[0057] Term Definitions Unless otherwise clearly stated, the terms and formats used in the text and their variants should be regarded as open rather than restrictive. For example, "including" means "including but not limited to"; "text" is used to provide a sample instance of the item under discussion for viewing or a list; indicator words such as "conventional", "traditional", "standard", "known", etc. do not limit the described item to a specific time period or available technology, and include technologies known now or in the future. Items, elements, or components connected by "and" or "or" should be interpreted as "and / or" unless otherwise clearly stated. Items, elements, or components in the singular form include the plural form unless clearly stated as singular. Words such as "a plurality of", "at least", "but not limited to", etc. do not imply a more compact range in the absence of such.

Claims

1. A zero-outward-convex flat-to-high heel conversion shoe with multi-stage linkage and composite locking, characterized in that, Comprising: 1) A shoe outsole, on the lower surface of which there are a fixed frame assembly and a fixed buckle, and the fixed frame assembly is a rectangular convex platform structure; 2) A high heel, which is connected to the fixed frame assembly through a rotating block. The rotating block is installed in the arc-shaped sliding groove of the fixed frame assembly and can drive the high heel to switch between the horizontal state in the flat-heel mode and the vertical state in the high-heel mode. The connection mode between the high heel and the rotating block includes detachable connection or fixed connection; 3) A zero-outward convex storage heel, which is a groove-shaped structure arranged on the lower surface of the shoe outsole and has a storage groove and a card slot. The storage groove is used to store the high heel in the flat-heel mode, and the card slot cooperates with the fixed buckle to fix the zero-outward convex storage heel; 4) A midsole structure, which is arranged inside the shoe outsole and is linked to the fixed frame assembly through an S-shaped connecting rod and a connecting block. One end of the S-shaped connecting rod is connected to the rotating block, and the other end is fixed to the shoe outsole through the connecting block. The midsole structure slides along the support track as the high heel rotates to adapt to the foot support requirements in the high-heel mode and the flat-heel mode.

2. A midsole structure for a footwear product, characterized in that: The midsole structure is linked to the shoe heel state through an S-shaped connecting rod and a connecting block, and the midsole structure slides along the support track. Among them, when the shoe heel is in the high-heel mode, the midsole structure slides backward to form an arch support; when the shoe heel is in the flat-heel mode, the midsole structure slides forward to adaptively flatten.

3. The midsole structure according to claim 2, characterized in that: The midsole structure includes a midsole support plate and a midsole card slot. The midsole support plate is embedded in the midsole structure, and the midsole card slot is used to lock or release the midsole support plate to realize the sliding and fixing of the midsole structure.

4. The midsole structure according to claim 2, characterized in that: The midsole structure slides along the support track, and the sliding distance is 10 mm to 15 mm, and the sliding distance is adjusted according to the shoe size.

5. The midsole structure according to claim 2, characterized in that: The midsole structure is made of aluminum alloy 6061-T6 and its surface is anodized.

6. The convertible shoe according to claim 1, characterized in that: The fixed frame assembly includes an arc-shaped sliding groove, a fixed gear and a moving gear. The rotating block is installed in the arc-shaped sliding groove through a rotating shaft, and the moving gear is fixed to the outer end of the rotating shaft and meshes with the fixed gear to drive the high heel to rotate.

7. The convertible shoe according to claim 1, characterized in that: The fixed frame assembly includes a latch fastener and a spring. The latch fastener is embedded in the groove of the high heel under the action of the spring to form a main latch, and the fixed frame assembly also includes a wedge-shaped locking tongue to form a secondary limiting mechanism.

8. The convertible shoe according to claim 1, characterized in that: The high heel and the rotating block are designed with a threaded connection, and the head of the high heel is replaceable.

9. The convertible shoe according to claim 1, characterized in that: The high heel and the rotating block are fixedly connected by integral molding.

10. The convertible shoe according to claim 1, wherein: The shoe sole includes a forefoot shock-absorbing area and a heel support area. The forefoot shock-absorbing area is made of high-elastic polyurethane rubber and a memory foam layer, and the heel support area is made of a carbon fiber-reinforced rubber composite material skeleton and honeycomb-shaped shock-absorbing rubber.

11. The convertible shoe according to claim 1, wherein: The high heel is of a detachable design. When the high heel is detached from the shoe sole, the S-shaped connecting rod releases pressure and pushes the midsole structure forward through the connecting block.

12. The convertible shoe according to claim 1, wherein: The zero-protrusion storage heel is parallel to the lower surface of the shoe sole in the flat-heel mode, and the high heel is stored in the storage groove.

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