Multi-stage Linked, Composite-Locked Zero-Protrusion Flat / High Heel Shoe with Mechanical Conversion and Midsole Reset

Abstract

The present invention relates to the field of footwear design and provides a zero-outer flat heel with multi-stage linkage and a complex locking mechanism, as well as a mechanical conversion and mid-low resetting system. To address the problems of low high-heel conversion efficiency, insufficient mid-low support, and protruding appearance in existing technologies, the present invention implements precise conversion between high heels and flat heels through a fixed frame assembly, realizes efficient conversion through multi-stage linkage, and ensures stability through a complex locking design. The zero-outer retractable heel maintains a flat appearance in flat heel mode. The mechanical conversion system automatically slides the mid-low resetting system through the linkage of an S-shaped connecting rod and a connecting block to adjust the foot support shape; in high heel mode, it forms a biomimetic arch, and in flat heel mode, it adaptively flattens. The present invention significantly improves conversion efficiency, foot comfort, and aesthetic appearance, and thoroughly resolves the support issues of traditional dual-purpose footwear.

Description

Technology Field This invention relates to the field of shoe design and manufacturing technology, and specifically to a flat-heel / high-heel switching shoe without external protrusions based on a multi-stage interlocking mechanism and a composite locking structure, as well as a mechanical switching system and a mid-low resetting system. The present invention aims to improve shoe mode switching efficiency, wearing comfort, and appearance completeness by implementing seamless switching between high-heel and flat-heel modes through a mechanical switching system and by having a mid-low resetting system automatically express the foot support area, and corresponds to the fusion application of shoe structural design and mechanical interlocking technology. Background Technology With the recent continuous evolution of fashion and functional requirements, the footwear design industry is placing a higher demand for innovation in high heels and everyday shoes. Traditional high heels feature fixed heel heights and shapes, which can cause foot health issues when worn for extended periods. While traditional everyday shoes are preferred for their improved comfort, they lack the fashion sense and visual enhancement of high heels. Consequently, there is a market demand for footwear products that combine the fashionability and visual benefits of high heels with the comfort of everyday shoes. In existing technologies, there have been attempts to implement a transition between high heels and everyday shoes through adjustable heel heights or detectable heels. For example, Korean Patent Document KR10-2024-0104813 discloses a heel module equipped with a sliding sensor; however, while this design considered the midsole issue, it fails to provide sufficient support by simply designing the midsole to be in a moving state. Korean Patent Document KR10-2018-0109595 discloses a design that separates the sole by pulling a lever; while this allows for quick and convenient replacement of the sole and heel, it does not solve the midsole support problem. Korean Patent Document KR10-2018-0099169 discloses a design that switches the heel via a sole zipper; however, this design creates a vibration space during storage, which detracts from the shoe's exterior lines. These existing technologies are lacking in terms of manipulation efficiency, biomechanical support, and structural encapsulation: Traditional designs rely on multiple operations or external setting components, making step switching cumbersome and inconvenient; The lack of dynamic linkage between midsole support and heel height changes results in uneven pressure on the foot; Locking mechanisms easily malfunction and experience performance degradation in hot and humid environments; In addition, a gap is created in the center or parts are exposed to the outside, detracting from the aesthetic appearance. Therefore, improved measures are needed to enhance the transition efficiency, wearing comfort, and appearance defects of the shoes. Prior art literature Patent Publication No. 10-2024-0104813 Patent Publication No. 10-2018-0109595 Patent Publication No. 10-2018-0099169 The problem to be solved This invention aims to solve the technical challenges of existing shoe conversion technologies. First, traditional high-heel and everyday shoe designs suffer from low operational efficiency and are time-consuming and inconvenient because they require manual adjustment of multiple conversion stages. Second, the midsole support does not adjust dynamically according to changes in shoe height, leading to uneven pressure on the foot and reduced wearing comfort. Additionally, when the heel is stowed, gaps may form or components may be exposed, detracting from the aesthetic appeal. To address these issues, this invention aims to realize a shoe design with superior appearance, comfort, and aesthetics by overcoming operational complexity, insufficient support, efficiency defects, and aesthetic problems through multi-stage interlocking, enhanced stability via complex locking, and automatic adjustment of the foot support via a midsole reset system. means of solving the problem To solve the above technical problem, the present invention provides a zero-outer flat high-heel conversion shoe based on multi-stage interlocking and complex locking fixation, and a mechanical conversion and midsole resetting system. This system implements seamless conversion of shoe heel height through a purely mechanical design and mainly includes a multi-stage interlocking electric mechanism, a complex locking fixation component, a midsole dynamic modification system, and a zero-outer storage design. Multi-stage interlocking electric motor: It implements shoe heel rotation switching with a single trigger through a cross-section interlocking design and spring weighting, and combines a mechanism sub-compensation axis and a double interlocking system to ensure the stability of the motion trajectory and eliminate deviations. Composite locking fixing component: Utilizing a double latch structure and a gear drive optimization design, it combines a lock and elastic preload to provide multidimensional stability in high-heel mode while simultaneously reducing operating force to enhance convenience. Midsole Dynamic Support System: Through the harmony of multi-stage interlocking and inclined materials, it dynamically adjusts the arch support in high-heel and normal modes to balance pressure distribution on the foot. Zero Outer Storage Design: Adopting a deep-matching internal groove and a sealing protection mechanism, the shoe heel is completely stored within the sole, realizing a flat appearance when folded and reliability in hot and humid environments. The above device resolves the contradictions of operation efficiency, biomechanical performance, and structural encapsulation, thereby improving the transition efficiency, wear comfort, and aesthetic appearance of the shoe. Effects of the invention The present invention realizes efficient and stable seamless transition of the shoe heel through a multi-stage interlocking and complex locking design, significantly improves operational efficiency and convenience, and thoroughly solves the problem of long transition movements in traditional methods. The locking system combines a button latch and a lock mechanism to enhance stability and interaction in high-heel mode, ensuring long-term reliability even in complex environments. The midsole reset system adjusts the dynamic foot shape through automatic sliding positioning; in high-heel mode, it forms a biomimetic arch, while in normal mode, it adaptively flattens to optimize foot pressure distribution, thereby improving wearing comfort. The zero outer storage design ensures a flat exterior when folded, overcoming the exterior protrusion defects of traditional technology. The present invention comprehensively improves the function and user experience of shoes by combining conversion efficiency, biomechanical support, form, and aesthetics. Brief explanation of the drawing FIG. 1 is a schematic diagram showing the overall appearance in the high-heeled mode of the present invention, showing the overall structure of the shoe body and the assembly relationship of the main parts. Figure 2 is a schematic diagram showing the internal structure of a zero outer storage heel. FIG. 3 is a side view of the flat shoe mode of the present invention. FIG. 4 is a cross-sectional view of the open-ended storage heel of the present invention, showing the storage and connection state of the high heel and the fixed frame assembly. FIG. 5 is a side view of the high-end mode of the present invention. FIG. 6 is an exploded schematic diagram of a fixed frame assembly, showing the internal structure and interlocking relationships of the fixed frame assembly. Figure 7 is a partial enlarged view of a complex locking system, showing the locking state in high-pressure mode. FIG. 8 is a partial enlarged view of the modified detachment mode of the composite locking system, showing that various shapes of bends can be detached and installed in the bend mode. Fig. 9 is a front view from below of the midsole dynamic reset system in high-grip mode, showing the static form of the midsole. FIG. 10 is a front view of the midsole dynamic reset system in flat mode seen from below, showing the unfolded state of the midsole dynamic reset system in flat mode. Figure 11 is a schematic diagram showing the structure of the shoe sole by zone. FIG. 12 is a drawing showing the elastic design details of the front window buffer zone. Figure 13 is a schematic diagram of another detachable heel system, showing the structure of the other detachable heel system and the cooperative relationship with the midsole reset system. Specific details for implementing the invention This specific method details the implementation of a zero-outer flat high-heel conversion system based on multi-stage linkage and complex locking fastening, as well as a mechanical conversion and midsole reset system. It achieves the conversion between high-heel and flat forms through purely mechanical design, and aims to improve operational efficiency, foot comfort, and aesthetic appearance by primarily including the shoe body, fixed frame assembly, and direct-linking outsole. The structure, function, and operating principles of each part are explained below. FIG. 1 illustrates an exemplary configuration of the zero outer flat high heel conversion shoe and its mechanical conversion and midsole resetting system based on multi-stage interlocking and complex locking fixation according to the present invention, and helps in understanding the features and functions of the present invention. The present invention is not limited to the structures or configurations illustrated and may be implemented with various alternative structures and configurations. The features and functions described in different exemplary embodiments may be used alone or in combination in other embodiments of the present invention and are not limited to specific embodiments. As shown in FIG. 1, the shoe body

[0100] It includes a shoe sole

[0130] , a high heel

[0120] , a zero outer storage heel

[0110] , and a fixed frame assembly

[0200] . The shoe sole

[0130] is the basic structure of the shoe sole, integrates functions, combines with an interlocking mechanism, and is made of special elastic rubber. The high heel

[0120] is made of aluminum alloy (switchable to heights of 50mm, 70mm, or 90mm), and all metal parts of the sole are made of the same material to ensure lightweight, wear resistance, and durability. As shown in FIG. 2, the zero outer storage heel

[0110] has a groove structure and has a storage groove

[0112] inside to store a high heel

[0120] . There is a through hole

[0111] at the bottom so that the bottom of the high heel

[0120] passes through. As shown in FIG. 6, the lower surface of the shoe sole

[0130] has a fixed frame assembly

[0200] and a fixed clip

[0140] . The fixed frame assembly

[0200] is a core mechanical component of the composite locking system and is designed with a rectangular protruding structure to integrate guiding, locking, and high-low switching support functions as an independent mechanical component. It is made of aluminum alloy and has an anodized surface to achieve lightweighting, withstand dynamic loads during the switching process, and provide excellent wear resistance and corrosion resistance. The fixing card

[0140] is a small locking tolerance structure of an inverted triangular prism and a cylindrical composite material, which positions the rectangular parts of the shoe sole

[0130] and the fixing frame assembly

[0200] and reinforces the rigidity of the card joint. When in use, if the zero outer storage heel

[0110] is pushed upward, the fixing card

[0140] is inserted into the card groove

[0113] of the zero outer storage heel

[0110] , and a tight connection is achieved through the geometric constraint of the groove of the inverted triangular prism and the friction of the cylinder, thereby quickly fixing the zero outer storage heel

[0110] to the shoe sole

[0130] . As shown in FIG. 3, in flat mode, the high heel

[0120] is embedded in the zero outer storage heel

[0110] parallel to the lower surface of the shoe sole

[0130] . ​​As shown in FIG. 5, in high heel mode, the high heel

[0120] is perpendicular to the lower surface of the shoe sole

[0130] , and the bottom forms a support structure through the through hole

[0111] . As illustrated in FIG. 6, the upper part of the fixed frame assembly

[0200] is fixed to the lower surface of the shoe sole

[0130] and is designed with a rectangular protruding structure to support the shape change of the high heel

[0120] and ensure the stability of the high heel mode and the precision of the change through a complex latch locking system. The fixed frame assembly

[0200] includes the following main parts: Extension

[0230] : Wall thickness 1.5±0.1mm, with internal stress-distributing ribs to enhance structural strength. Arc-shaped slide groove

[0210] : Radius of curvature R15mm, surface is PTFE coated to reduce frictional resistance. Rotating block

[0240] : Made of aluminum alloy 6061-T6, assembly gap ≤0.05mm, surface anodized to improve wear resistance. The rotating block

[0240] is installed in the arc-shaped slide groove

[0210] via a rotating shaft, a moving gear

[0260] is fixed to one end of the rotating shaft, and a fixed gear

[0250] is rotatably installed on both side walls of the fixed frame

[0200] . The end of the rotating block

[0240] is connected to the high heel

[0120] , and through the interlocking transmission of the fixed gear

[0250] and the moving gear

[0260] and the track limitation of the arc-shaped slide groove

[0210] , the high heel

[0120] realizes precise position adjustment and switching between horizontal (flat) and vertical (high heel) states. As illustrated in FIG. 7, the composite latch locking system adopts a double insurance design to ensure that the high heel

[0120] has multidimensional stability in the vertical position. The main latch mechanism includes the following parts: Latch

[0280] : Made of aluminum alloy 6061-T6, thickness 1.2mm, robust structure. Spring

[0281] : Spring constant k=0.6N·mm / °, preload angle 15°±1°, provides stable elasticity. Locking mechanism block

[0283] : Holds the high heel

[0120] in the high heel position, and the method of connection with the high heel

[0120] can be combined built-in or detachable (e.g., spiral detachable) to adapt to various design requirements. Circular fixing pin

[0282] : Joined to the top of the locking mechanism

[0283] to restrict rearward rotation of the high heel

[0120] and prevent accidental release. Locking process: In the high-heel mode, the latch

[0280] is fitted into the groove of the locking mechanism block

[0283] of the high-heel

[0120] by the action of the spring

[0281] , providing a reliable normal restraining force (≥800N) using the wedge locking principle. The circular fixing pin

[0282] is attached to the top of the locking mechanism

[0283] to further restrict the rotation of the high-heel

[0120] and maintain the locked state stably. The spring

[0281] prevents the high-heel

[0120] from shaking or wobbling by ensuring that the latch

[0280] goes as deep into the groove as possible. Flat mode: The latch

[0280] is a stop part that is held in a normal position using the elasticity of the spring

[0281] to prevent shaking or movement of the high heel

[0120] . Normal mode: The latch

[0280] is a stop part that is held in a normal position using the elasticity of the spring

[0281] to prevent shaking or movement of the high heel

[0120] . Release mechanism: To unlock the lock, the user pushes the latch

[0280] out of the wedge position, and when the spring

[0281] is released, the latch

[0280] comes out of the groove and the high heel

[0120] can rotate freely. Additional stability design: As shown in FIG. 4, the internal cavity of the fixed frame

[0200] has a fixed groove

[0220] , and the bottom of the rotating block

[0240] has a rubber pad [120-2] (made of an elastic material, matching the material of the shoe sole

[0130] ) which is fitted into the fixed groove

[0220] to form a zero-gap coupling, thereby enhancing friction and practicality in normal conditions. In addition, the power transmission mechanism ensures power transmission efficiency ≥92% by optimizing the meshing angle and gear contour through the inclined gear group

[0250] /

[0260] , and the high heel

[0120] follows a preset trajectory in normal conditions. Connection method between the high heel

[0120] and the locking mechanism block

[0283] : The high heel

[0120] can be connected to the locking mechanism block

[0283] in the following two ways, and the user can select as needed: Screw connection: As shown in FIG. 8, the high heel

[0120] is fixed to the locking mechanism block

[0283] with a screw, making replacement or adjustment easy. The high heel

[0120] is fixed to the locking mechanism block

[0283] with an M6 screw, ensuring connection strength with a screw depth ≥8 mm. Card insertion: As shown in FIG. 7, the high heel

[0120] is inserted into the locking mechanism block

[0283] with a card, and with a card tolerance ≤0.02mm, it provides quick installation and removal functions, ensuring higher support and stability. Both methods are possible; the screw connection is suitable for cases where the high heel

[0120] needs to be replaced frequently, while the card insertion emphasizes structural stability. In flat mode, the latch

[0280] touches the bottom of the high heel

[0120] to prevent vertical movement or rotation, ensuring stability in the normal state. As illustrated in FIGS. 9 and 10, the midsole dynamic reset system realizes precise shape control of the high-heeled

[0120] and flat modes through aluminum alloy mechanical interlocking and inclined materials. The system includes a midsole structure

[0400] , a midsole support track [400-1] (embedded in the midsole structure

[0400] and acting as a slide track for the 271 connecting block), a midsole support plate

[0410] , a midsole card

[0420] (locking and unlocking

[0410] mechanism), an S-shaped connecting rod

[0270] and a connecting block

[0271] , and triggers the dynamic equipment through root rotation of the fixed frame assembly

[0200] . The interlocking mechanism drives the sliding part of the midsole structure

[0400] using an S-shaped connecting rod

[0270] and a connecting block

[0271] . A track sized to the

[0271] connecting block is embedded in the back of the midsole structure

[0400] to provide rigid support, and the connecting block

[0271] slides along the support track [400-1]. The specific operating principle is as follows: Heel mode (Fig. 9): When the heel

[0120] is rotated 90° from the root, the S-shaped connecting rod

[0270] is triggered, causing the connecting block

[0271] to slide smoothly along the midsole structure

[0400] under the action of gravity (the sliding distance is defined by the shoe size, e.g., 10mm for size 36, approximately 15mm for size 42). After the connecting block

[0271] slides stably along the internal support track [400-1] for the corresponding distance, the midsole card

[0420] is synchronously moved backward to lock with the support plate

[0410] , forming a biomimetic arch structure. The support plate

[0410] acts as a reinforcing bracket to work in conjunction with the fatigue material to distribute pressure and increase sole pressure by 28%. The sponge cushioning structure and invisible support in the middle of the shoe sole further enhance stability, and the 57° triangular dynamic structure when unfolded strengthens lateral stability by 2.3 times. Flat mode (Fig. 10): When the base of the high-heeled shoe

[0120] is rotated in the opposite direction, the S-shaped connecting rod

[0270] pushes the connecting block

[0271] forward, and the connecting block

[0271] slides stably forward by the corresponding distance within the support track [400-1], then touches the support plate

[0410] , opens the midsole card slot

[0420] , moves it forward, and releases the locking state with the support plate

[0410] to release the midsole fixing width. The front sole supercritical rubber

[0131] (repulsion force ≥70%) and memory foam layer [131-2] adaptively unfold to provide a natural bending angle of 110°, and achieve zero outer storage (thickness 12mm) in the folded state. This system drives the sliding part of the midsole structure

[0400] through mechanical interlocking of the S-shaped connecting rod

[0270] and the connecting block

[0271] , and combines a lightweight design for heavy loads with a biomechanical perspective of the inclined material to realize a technical balance of precise control of shape transformation and industrial aesthetics. As shown in FIG. 11, the inclined interlocking shoe sole

[0130] is divided into a front cushioning zone

[0131] and a heel support zone

[0132] . Front cushioning zone

[0131] : The front cushioning zone is composed of elastic material [131-1] rubber silicone material and a memory foam layer [131-2], and adopts high-elasticity polyurethane rubber (rebound force ≥60%, shock absorption rate 65%) to provide a soft and elastic fit. Heel support zone

[0132] : Adopts a skeletal structure made of carbon fiber reinforced rubber composite material (carbon fiber content 50%, pressure resistance ≥120MPa) to ensure support and stability in high-heel mode. High-heel state (Fig. 4 → Fig. 5): The user presses the release button to unlock the fixing card

[0140] and releases the fixed state of the zero outer storage heel

[0110] . Manually rotate the high-heel

[0120] to a vertical position so that the bottom penetrates the through hole

[0111] . The fixing card

[0140] is re-inserted into the card slot to be fixed, and the midsole structure

[0400] moves backward to lock, forming a foot support to increase stability in high-heel mode and complete the mode transition. Normal state (Fig. 4 → Fig. 3): The high heel

[0120] is parallel to the lower surface of the shoe sole

[0130] and is embedded in the zero outer storage heel

[0110] . The fixing card

[0140] is inserted into the card groove of the zero outer storage heel

[0110] and is fixed by geometric constraint and friction. The midsole structure

[0400] naturally unfolds due to the action of the front sole cushioning area

[0131] to provide soft foot support, and the transition process takes about 3 seconds. As illustrated in FIG. 13, the present invention provides a different detachable heel system and, in cooperation with a midsole reset system, realizes an integrated transition between high heel and flat modes. The shoe sole

[0300] includes a shoe front [300-A], a shoe midsole [300-B], and a shoe rear [300-C]. A high heel part

[0310] is connected to the shoe sole

[0300] via a hinge mechanism

[0320] and can be folded or detached. The user can press the release button of the hinge mechanism

[0320] to unfold the high heel part

[0310] and fold it into the shoe middle [300-B] to convert it into a normal shoe. During the folding process, the triangular support part

[0330] supports a stable triangular structure. In an alternative embodiment, the high heel part

[0310] is completely detachable. In high heel mode, the high heel part

[0310] supports the rear end of the shoe [300-C], and in flat mode, the high heel part

[0310] can be removed or placed on the shoe suspension [300-B]. Triangular support part

[0330] : Located at the rear of the shoe's rear end [300-C], it forms a triangular support structure with the hinge mechanism

[0320] when the high heel part

[0310] is locked in the high heel mode, thereby reinforcing the stability of the shoe. Midsole reset system: Includes an S-shaped connecting rod

[0270] , a connecting block

[0271] , and a midsole structure

[0400] . When the high heel part

[0310] is unfolded vertically, the S-shaped connecting rod

[0270] slides the midsole structure

[0400] backward through the connecting block

[0271] to form an arch support, and when the high heel part

[0310] is folded horizontally or separated, the S-shaped connecting rod

[0270] slides the midsole structure

[0400] forward to adaptively flatten it. Therefore, in cooperation with other detachable heel systems, the midsole reset system realizes automatic adjustment of the midsole structure

[0400] in high heel and flat modes, embodying design versatility and wide applicability. Definition of Terms Terms and formats used in the text should be considered open and non-restrictive unless explicitly stated otherwise. For example, "include" means "include but not limited thereto"; "text" is used to provide exemplary instances of discussion items and to view lists; modifiers such as "general," "traditional," "standard," and "known" do not limit the described items to a specific time or available technology, but include technologies known now or in the future. Items connected by "and" or "or" should be interpreted as "and / or" unless explicitly stated otherwise. Singular numerical items, elements, or components include plural forms unless explicitly designated as singular. Terms such as "multiple," "at least," and "but not limited thereto" do not require a stricter scope than when these terms are absent. Explanation of the symbols

[0100] - Shoe body

[0110] - Zero external protrusion accommodating heel

[0111] - Tonggong

[0112] - Zero external protruding heel internal storage groove

[0113] - Zero external protrusion acceptance heel card slot

[0120] - High heels [120-1] - Heel rubber pad [120-3] - Replaceable high heel style 1 [120-4] - Replaceable high heel styles 2

[0130] - Inclined shoe sole [131-1] - Rubber silicone material [131-2] - Memory foam layer

[0132] - Heel support area, carbon fiber rubber material

[0140] - Fixing buckle

[0200] - Fixed frame assembly [120-2] - Rubber pad

[0210] - Arc-shaped slide home

[0220] - Fixed groove

[0230] - Extension

[0240] - Electric block

[0250] - Fixed gear

[0260] - Moving gear

[0270] - S-shaped connecting rod

[0280] - Latch

[0281] - Spring

[0282] - Circular fixing pin

[0283] - Locking mechanism block [283-1] - Locking mechanism block deformation spiral (or may be any detachable device)

[0300] - Shoe sole [300-A] - Front part of the shoe [300-B] - Middle part of the shoe [300-C] - Back of the shoe

[0310] - High heels

[0320] - Hinge mechanism (supports folding and unfolding of the high heel part

[0310] )

[0330] - Triangular support (in high heel mode, it forms a triangular structure with the hinge mechanism

[0320] and high heel part

[0310] to provide additional support)

[0400] - Vocal Ensemble [400-1] - Support track (built into midsole structure

[0400] , serves as the slide track for

[0271] )

[0410] - Vocal support plate

[0420] - Vocaloid Card (Lock and Unlock

[0410] Device)

Claims

Claim 1 A zero-outward-convex flat-high heel conversion shoe based on multi-stage interlocking and complex locking, comprising a shoe sole, a high heel, and a zero-outward-convex storage heel, the features of which are as follows: the lower surface of the shoe sole is provided with a fixed frame assembly and a fixed clip, the fixed frame assembly is formed as a rectangular protruding structure to support the conversion between different forms of the high heel, and the zero-outward-convex storage heel is a groove-shaped structure that stores the high heel in flat heel mode and includes a card slot that engages with the fixed clip; The high heel is connected to a fixed frame assembly via a rotating block, and the rotating block rotates within an arc-shaped sliding groove to switch the high heel between a horizontal state (flat heel mode) and a vertical state (high heel mode); the high heel has any shape or contour and its length can be extended or shortened according to the shoe size, and the connection with the rotating block is either detachable or fixed; the fixed frame assembly includes 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 sole via the connecting block; the convertible shoe includes a midsole structure, and the midsole structure is interlocked via the S-shaped connecting rod and the connecting block, and the midsole structure automatically slides along a support track according to the rotation of the high heel to adaptively meet the foot support requirements of the high heel mode and flat heel mode. Claim 2 The midsole structure used in footwear products is characterized as follows: the midsole structure is linked to the state of the shoe heel through an S-shaped connecting rod and a connecting block, and automatically slides along a support track according to changes in the heel shape; in high heel mode, the midsole structure slides backward to form arch support, and in flat heel mode, it slides forward to provide a natural bending angle; the midsole structure includes a midsole support plate and a midsole card slot, the midsole support plate is embedded within the midsole structure to provide rigid support, and the midsole card slot enables sliding and fixing by fixing or releasing the midsole support plate; the sliding distance of the midsole structure is adjusted according to the shoe size to adapt to high heel and flat heel modes; the midsole structure is manufactured of aluminum alloy, and its surface is anodized to provide lightweight, wear resistance, and corrosion resistance. Claim 3 In the conversion shoe according to claim 1, the fixed frame assembly includes an arc-shaped sliding groove, a fixed gear, and a moving gear, and a 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 engages with the fixed gear to drive the rotation of the high heel. Claim 4 In the conversion shoe according to claim 1, the fixed frame assembly comprises a latch locking member and a spring, wherein the latch locking member is inserted into a groove of the high heel through the force of the spring in an L-shaped structure or other shape to implement a main locking function, and additionally includes a wedge-shaped locking tongue to form a two-stage limiting mechanism. Claim 5 In the convertible shoe according to claim 1, the high heel and the rotating block are combined by a screw-type detachable connection design or designed by an integral fixed connection, and in the case of a detachable connection, the high heel head is replaceable to adapt to heels of various shapes, contours or lengths, and in the case of a fixed connection, structural stability is ensured. Claim 6 In the conversion shoe according to claim 1, the shoe sole comprises a forefoot cushioning zone and a heel support zone, wherein the forefoot cushioning zone is composed of a high-elasticity polyurethane rubber and a memory foam layer to provide soft cushioning and adaptive contact, and the heel support zone is composed of a carbon fiber reinforced rubber composite frame and a honeycomb cushioning rubber to provide high-strength support and cushioning effect and to realize inclined support. Claim 7 In the conversion shoe according to claim 1, the mechanical conversion system is designed as a detachable high heel module, and when the high heel is separated from the shoe sole, an S-shaped connecting rod releases pressure and a connecting block moves forward to slide the midsole structure, thereby converting to a flat heel mode. Claim 8 In the conversion shoe according to claim 1, the zero outer convex storage heel is parallel to the lower surface of the shoe sole in flat heel mode, and the high heel is stored inside to maintain the flatness of the exterior.

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