A portable flip-flop / sandal

Abstract

This utility model discloses a portable sandal / slipper combo shoe, comprising a sole plate, a front loop, and a rear loop. The rear loop has an inner loop body and an outer loop body, both of which are arc-shaped. The rear end of the sole plate, the inner loop body, and the outer loop body are sequentially fitted together from the inside out. There is a gap between the inner loop body and the sole plate, and between the outer loop body and the inner loop body. The sole plate has a protruding connecting block with a folding structure. The outer loop body and the front loop are connected together through the connecting structure, or the inner loop body and the front loop are connected together through the connecting structure. Compared with existing technologies, it can be freely switched between sandals and slippers, offering dual functionality and convenient switching operation, making it easy for users to carry when going out. In addition, the new connector facilitates the connection between the outer loop and the front shoe loop, and the outer loop and the front shoe loop will not move during use, ensuring comfortable wear.

Description

Technical Field

[0001] This utility model relates to the field of footwear, and in particular to a portable sandal / slipper combo shoe. Background Technology

[0002] Traditional slippers have a sole and a strapped upper. Because the strapped upper protrudes above the sole, it takes up space when carried and can easily become brittle, making it inconvenient to carry. This often forces people to use disposable slippers when traveling, causing inconvenience. To address this, the applicant has developed a portable slipper, such as the adjustable portable slipper announced on June 9, 2020 (CN210696173U). This slipper includes an elastic sole plate that conforms to the shape of the human foot. The sole plate is divided into a forefoot section and a heel section. The forefoot section has a front arc-shaped shoe loop at its front end, with both ends of the loop fixedly connected to the left and right sides of the forefoot section. The heel section has a rear shoe loop at its rear end, with both ends fixedly connected to the left and right sides of the heel section. The top surface of the rear shoe loop has a common... Multiple adjustment grooves extending left and right on the same side are spaced apart on the rear shoe strap in a front-to-back direction. Each adjustment groove is located on the inside of the foot, with its left and right ends extending to the edge of the rear shoe strap. The adjustment groove is an inclined groove with a high and a low end, with the high end of the inclined groove close to the heel section. The adjustment groove is V-shaped. The system also includes a connector that connects the center of the upward-folded front arc-shaped shoe strap to the center of the upward-folded rear shoe strap. The connection between the front arc-shaped shoe strap and the rear shoe strap forms the upper of the slipper. With this structure, the slippers can be used by connecting the front and rear shoe straps to form a pair of slippers. When not in use, the front arc-shaped shoe strap, the rear shoe strap, and the sole plate are on the same plane, making the entire slipper a single, easy-to-carry structure. However, slippers of this type cannot be used as sandals, and their single function means that people need to carry both a pair of sandals and a pair of slippers when going out, increasing the burden of carrying them.

[0003] In view of the above-mentioned problems, the inventors of this invention came into being. Summary of the Invention

[0004] The purpose of this invention is to provide a portable slipper / sandwich shoe to solve the problem that slippers in the prior art cannot be used as sandals and have limited functionality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A portable flip-flop / sandal includes a sole plate, a front loop, and a rear loop. The front loop is connected to the left and right sides of the front end of the sole plate, and the rear loop is connected to the left and right sides of the rear end of the sole plate. The front and rear loops are connected together by a connecting structure. The rear loop has an inner loop body and an outer loop body, both of which are arc-shaped. The rear end of the sole plate, the inner loop body, and the outer loop body are sequentially nested from the inside to the outside. There is a gap between the inner loop body and the sole plate, and between the outer loop body and the inner loop body. The left and right side walls of the rear end of the sole plate are respectively provided with connecting blocks in front of the rear loop. The two ends of the outer loop body and the inner loop body are integrally formed and connected to the two connecting blocks. The connecting blocks are provided with a rear folding structure for easy folding.

[0007] The outer loop and the front shoe loop are connected together by the aforementioned connecting structure, or the inner loop and the front shoe loop are connected together by the aforementioned connecting structure.

[0008] The outer loop body is provided with an outward folding structure that makes it easy to fold upwards.

[0009] The aforementioned inner loop body is provided with an inward folding structure that makes it easy to fold upwards.

[0010] The rear end of the aforementioned connecting block has a folding gap with the sole plate, and the folding gap is located in front of and connected to the gap between the sole plate and the inner loop.

[0011] The aforementioned connection structure is a hollow fastener. The fastener has a locking structure in which the front shoe loop, outer loop, and inner loop can be respectively inserted. The front end of the fastener is provided with a front limiting structure that restricts the front shoe loop from moving back and forth and from falling out of the fastener. The rear end of the fastener is provided with a rear limiting structure that restricts the outer loop from moving back and forth and from falling out of the fastener.

[0012] Both ends of the aforementioned inner loop body have a recessed inner V-shaped groove on the top and bottom surfaces that penetrates the inner and outer sides of the inner loop body. The two inner V-shaped grooves constitute the inner folding structure. Both ends of the aforementioned outer loop body have a recessed outer V-shaped groove on the top and bottom surfaces that penetrates the inner and outer sides of the outer loop body. The two outer V-shaped grooves constitute the outer folding structure.

[0013] The top surface of the aforementioned outer loop body is provided with at least one rear V-shaped through groove behind the outer V-shaped through groove.

[0014] The outer wall of the connecting block is a concave arc surface that curves inward. The outer wall of the front end of the connecting block smoothly transitions with the outer wall of the sole plate. The outer wall of the rear end of the connecting block smoothly transitions with the outer wall of the end of the outer loop. The top surface of the inner loop and the top surface of the outer loop are lower than the top surface of the sole plate. The rear end of the top surface of the connecting block has a downward sloping surface and an upward sloping surface behind the downward sloping surface. The downward sloping surface and the upward sloping surface are connected by an arc surface. The downward sloping surface, the arc surface, and the upward sloping surface form a bending groove. The upward sloping surface smoothly transitions with the top surface of the inner loop and the top surface of the outer loop. The bottom surface of the connecting block is recessed with an arc-shaped through groove that runs through the inside and outside direction. The highest point of the arc-shaped through groove is behind the lowest point of the bending groove. The bending groove and the arc-shaped through groove constitute the aforementioned back folding structure.

[0015] The aforementioned front shoe loop has a front break at the connector to separate the front shoe loop into two loops, and a front cylindrical rod for connecting the two loops is located at the front break. The front end of the fastener has the aforementioned front limiting structure to restrict the front cylindrical rod from moving back and forth and to disengage from the fastener. The aforementioned rear shoe loop has a rear block protruding rearward at the connector. The rear side of the rear block has a strip-shaped through groove that extends vertically and horizontally. The rear block has a rear cylindrical rod integrally formed at this strip-shaped through groove to close the groove opening. The rear end of the fastener has the aforementioned rear limiting structure to restrict the rear cylindrical rod from moving back and forth and to disengage from the fastener.

[0016] The aforementioned connector has an upper top plate, the front end of which is integrally formed with a downwardly curved front arc plate. The rear side of the front arc plate is recessed forward to form a front concave cavity. The rear end of the upper top plate is integrally formed with a downwardly curved rear arc plate. The free end of the rear arc plate extends forward and upward at an angle, and the free end of the rear arc plate is integrally formed with a forwardly extending lower straight portion. The distance between the lower straight portion and the upper top plate is smaller than the outer diameter of the rear cylindrical rod. The lower straight portion constitutes the rear limiting structure. The front end of the lower straight portion is integrally formed with a downwardly inclined convex arc portion. There is an interlocking gap between the convex arc portion and the rear end of the front arc plate. The width of the interlocking gap is smaller than the outer diameter of the front cylindrical rod and the rear cylindrical rod. This interlocking gap and the convex arc portion constitute the bayonet structure. The front concave cavity and the convex arc portion constitute the front limiting structure.

[0017] By adopting the above technical solution, this utility model provides a portable sandal / slipper combo. Because the rear strap is composed of an inner strap and an outer strap, and the connecting block of the sole plate has a folding-back structure, when the outer or inner strap is folded forward and pulled to connect with the front strap, the inner or outer strap also folds upward at a certain angle. Thus, when worn, the outer strap and front strap function as the upper of the sandal, and the inner strap functions as the rear strap. Alternatively, the inner loop and the front loop can be positioned on the instep, similar to the upper of a sandal, while the outer loop can be positioned on the back loop. Furthermore, the outer and inner loops can be placed together on the instep, allowing the sandal to be used as a slipper, enabling free switching between sandals and slippers. This dual-function design is convenient and easy to carry. Additionally, the new connector allows for easy connection between the outer loop and the front loop, ensuring they remain stationary during use and providing comfortable wear. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model when used as a sandal;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention, omitting the connecting parts;

[0020] Figure 3 This is a perspective view of the connector in this utility model. Detailed Implementation

[0021] This utility model relates to a portable dual-purpose sandal / slipper, such as... Figure 1-3 As shown, the shoe includes a sole plate 1, a front shoe loop 2, and a rear shoe loop 3. The front shoe loop 2 is connected to the left and right sides of the front end of the sole plate 1. Specifically, the front shoe loop 2 is an arc-shaped band corresponding to the toe contour of the sole plate 1. The front shoe loop 2 is located outside the front end of the sole plate 1. There is a gap of 100 between the front shoe loop 2 and the outer side wall of the front end of the sole plate 1. The left and right outer side walls of the front end of the sole plate 1 are provided with forward protrusions 11 extending along the arc direction of the sole plate 1. The left and right ends of the front shoe loop 2 are integrally formed with the forward protrusions 11. The outer side walls of the front shoe loop 2, the outer side walls of the forward protrusions 11, and the outer side walls of the sole plate 1 are smoothly transitioned and matched. That is, the width of the forward protrusions 11 in the left and right directions gradually decreases from front to right, approaching 0.

[0022] The front shoe strap 2 is provided with a folding structure that allows it to be easily folded upwards. Specifically, the front top surface of the front protrusion 11 has an upper groove 111 that extends downwards to the top surface of the end of the front shoe strap 2, and the front bottom surface of the front protrusion 11 has a lower groove 112 that extends upwards to the bottom surface of the end of the front shoe strap. The upper groove 111 and the lower groove are arc-shaped V-grooves that penetrate the inner and outer sides (i.e., the left and right sides) of the front protrusion 11. The highest point of the lower groove 112 is located in front of the lowest point of the upper groove 111. The upper groove 111 and the lower groove 112 constitute the folding structure of the front shoe strap 2. In application, when the front shoe strap 2 is folded upwards and backwards, the lower groove 112 and the upper groove 111 make the folding of the front shoe strap 2 smoother, preventing the front shoe strap 2 from stretching and making it less likely to break between the front shoe strap 2 and the sole plate.

[0023] The rear shoe loop 3 is connected to the left and right sides of the rear end of the sole plate 1. The front shoe loop 2 and the rear shoe loop 3, which are folded upwards, are connected together by a connecting structure. The rear shoe loop 3 has an inner loop body 31 and an outer loop body 32. The rear end of the sole plate 1, the inner loop body 31, and the outer loop body 32 are sequentially nested from the inside to the outside. Specifically, both the outer loop body 32 and the inner loop body 31 are arc-shaped bands. The arc contour of this arc-shaped band is consistent with the shape of the sole plate 1. The rear end contours match, the inner loop 31 is located outside the rear end of the sole plate 1, and the two ends of the inner loop 31 are located outside the left and right sides of the rear end of the sole plate 1. There is a gap of 200 between the inner loop 31 and the outer side wall of the sole plate 1. The outer loop 32 is located behind the inner loop 31, and the two ends of the outer loop 32 are located outside the two ends of the inner loop 31. There is a gap of 300 between the outer loop 32 and the inner loop 31.

[0024] The left and right side walls of the rear end of the sole plate 1 are respectively provided with connecting blocks 12 in front of the rear shoe loop 3. There is a gap of 400 between the rear end of the connecting block 12 and the sole plate 1. The connecting block 12 is provided with a rear folding structure at the gap of 400 between the connecting block and the sole plate to facilitate the upward folding of the connecting block 12. Specifically, the connecting block 12 is a strip-shaped block extending backward. The width of the connecting block in the left and right directions decreases from back to front and approaches 0. The rear end of the connecting block 12 on the left side The connecting block 12 is integrally injection molded with the left end of the inner loop 31 and the left end of the outer loop 32. The rear end of the connecting block 12 on the right side is integrally injection molded with the right end of the inner loop 31 and the right end of the outer loop 32. The outer wall of the connecting block 12 is a concave arc surface. The front outer wall of the connecting block 12 smoothly transitions with the outer wall of the sole plate 1, and the rear outer wall of the connecting block 12 smoothly transitions with the end outer wall of the outer loop 32, making the entire outer contour of the sole a continuous arc. The top surface of the connecting block 12... The rear end has a downwardly sloping surface and an upwardly sloping surface located behind the downwardly sloping surface. The downwardly sloping surface and the upwardly sloping surface are connected by an arc surface. The downwardly sloping surface, the arc surface, and the upwardly sloping surface form a bending groove 121. The upwardly sloping surface smoothly transitions to the top front surface of the inner loop 31 and the top front surface of the outer loop 32. The top surface of the connecting block 12 is lower than the top surface of the sole plate 1, and the bottom surface of the connecting block 12 is on the same plane as the bottom surface of the sole plate 1. The bottom surface of the connecting block 12 has a recessed part that runs through the inside and outside direction. The arc-shaped through groove (not shown in the figure) has its highest point behind the lowest point of the bending groove 121. The bending groove 121 and the arc-shaped through groove form the aforementioned rear-folding structure. In application, the bending groove 121 and the arc-shaped through groove make it easier for the connecting block 12 to bend upwards. Furthermore, by placing the highest point of the arc-shaped through groove behind the lowest point of the bending groove 121, the arc-shaped through groove can be stretched to the maximum extent and evenly when the connecting block 12 is folded, thus preventing the connecting block 12 from breaking and extending its service life.

[0025] The inner loop 31 is provided with an inward folding structure that facilitates upward folding. Specifically, both ends of the inner loop 31 have recessed inner V-shaped grooves 311 that penetrate the inner and outer sides of the inner loop 31, forming the inward folding structure of the inner loop 31. Similarly, the outer loop 32 is provided with an outward folding structure that facilitates upward folding. Both ends of the outer loop 32 have recessed outer V-shaped grooves 321 that penetrate the inner and outer sides of the outer loop 32, forming the outward folding structure of the outer loop 32. During folding, the inner and outer loops utilize their V-shaped grooves to facilitate smooth upward folding. Preferably, the top surface of the outer loop 32 is provided with at least one rear V-shaped through groove 322 behind the outer V-shaped through groove 321. In this embodiment, four rear V-shaped through grooves 322 are provided at one end of the outer loop 32, and only one rear V-shaped through groove 322 is provided at the other end. The multiple V-shaped through grooves 322 arranged at intervals make it easier for the outer loop 32 to fold upward and forward. At the same time, the multiple V-shaped through grooves can make the folded outer loop 32 have a certain curvature, preventing the outer loop 32 from breaking when folded. In this new invention, the inner folding structure can be selected for processing according to the actual style.

[0026] The connecting structure is a hollow fastener 4. The fastener 4 has a locking structure for the front shoe loop 2, inner loop 31, or outer loop 32 to be respectively inserted into it. The front end of the fastener has a front limiting structure that restricts the front shoe loop from moving forward and backward and from exiting the fastener, and the rear end of the fastener has a rear limiting structure that restricts the outer loop from moving forward and backward and from exiting the fastener. Specifically, the front shoe loop 2 has a front break corresponding to the connecting piece, separating the front shoe loop 2 into two loops. The front shoe loop 2 has a front cylindrical rod 21 at the front break for connecting the two loops. The front end of the fastener 4 has... A front limiting structure restricts the front cylindrical rod 21 from moving back and forth and from disengaging from the fastener. The rear shoe loop 32 has a rear block protruding backwards corresponding to the fastener 4. The rear side of the rear block has a strip-shaped through groove 323 that runs vertically through the front and extends horizontally. The rear block has a rear cylindrical rod 324 integrally formed at the location of this strip-shaped through groove 323, which closes the opening of the strip-shaped through groove 323. The lengths of the front cylindrical rod 21 and the rear cylindrical rod 324 are greater than the width of the fastener 4. The rear end of the fastener 4 has a rear limiting structure that restricts the rear cylindrical rod 324 from moving back and forth and from disengaging from the fastener.

[0027] The fastener 4 is an injection-molded part, comprising an upper top plate 41, a front curved plate 42, and a rear curved plate 43. The width of the upper top plate 41 in the left-right direction is less than the length of the front cylindrical rod 21 and the length of the rear cylindrical rod 324. The front curved plate 42 is located in front of the upper top plate 41 and is a forward-convex arc block. The rear side of the front curved plate 42 is recessed forward, i.e., the front curved plate 42 has a C-shaped structure with the opening of the C-shaped structure facing rearward. The upper end of the front curved plate 42 is integrally formed with the front end of the upper top plate 41. The lower end face of 2 is a slightly upward-extending convex arc surface. The rear-bent arc plate 43 is located behind the upper top plate 41. The rear-bent arc plate 43 is a non-closed-loop arc block. The arc of the non-closed-loop arc block is greater than the arc of a semicircle. The opening of the non-closed-loop arc block faces forward. The upper end of the rear-bent arc plate 43 is integrally formed with the rear end of the upper top plate 41. The lower end of the rear-bent arc plate 43 extends forward and upward. The lower end of the rear-bent arc plate 43 has an integrally formed lower straight portion 431 extending forward. The distance between the lower straight portion 431 and the upper top plate 41 is less than that between the rear cylindrical rod 3 and the upper top plate 41. The outer diameter of the lower straight portion 431 is 24. The lower straight portion 431 forms the rear limiting structure. The front end of the lower straight portion 431 is integrally formed with a downwardly inclined convex arc portion 431a. There is a distance 500 between the convex arc portion 431a and the convex arc surface of the front curved plate 42. The width of the distance 500 is smaller than the outer diameter of the front cylindrical rod 21 and the outer diameter of the rear cylindrical rod 324. This distance 500 and the convex arc portion 431a form the bayonet structure. The front concave cavity and the convex arc portion 431a form the front limiting structure. In application, the lower straight portion 431 forms a cantilever arm structure, and... There is a gap between the rear cylindrical rod 324 and the upper top plate, so that when the rear cylindrical rod 324 is inserted from the gap 500, it can push the lower straight part 431 upward and deform it, so that the rear cylindrical rod 324 slides into the front concave cavity, and then moves the rear cylindrical rod 324 into the arc space of the rear curved plate 43. At this time, the lower straight part 431 confines the rear cylindrical rod 324 within the rear curved plate 43. Similarly, when the front cylindrical rod 21 is slid into the front concave cavity from the gap 500, the convex arc part 431a holds the rear side of the front cylindrical rod 21, so that the front cylindrical rod 21 cannot move.

[0028] This utility model discloses a portable dual-purpose sandal / slipper. In use, first pull the outer loop 32 forward, and insert the rear cylindrical rod 324 into the fastener 4 through a 500mm gap, placing it within the rear curved plate 43. Then, the lower straight part 431 fixes and limits the rear cylindrical rod 324. Next, pull the front shoe loop 2 backward, and insert the front cylindrical rod 21 into the front concave cavity of the front curved plate 42 through a 500mm gap. The convex arc part 431a supports the rear side of the front cylindrical rod 21, fixing and limiting its position. At this point, the shoe upper assembly is complete. Because when the outer loop 32 is pulled forward… When the outer loop 32 is pulled forward using the bending groove 121 and arc-shaped through groove on the connecting block, the connecting block 12 folds upward. The upward folding of the connecting block 12 causes the inner loop 31 to be driven forward accordingly. When the outer loop 32 is connected to the front loop 2, the inner loop 31 tilts upward at a certain angle. That is, the inner loop 31 can be used as the back strap of the sandal, so that the whole shoe can be used as a sandal. Then, the folding structure of the inner loop 31 can be used to smoothly fold the inner loop 31 forward again. In this way, when wearing the shoe, the inner loop 31 can be placed on the instep of the wearer, so that the shoe can be used as a slipper.

[0029] Compared with the prior art, the portable sandal / slipper of this utility model has the following beneficial effects:

[0030] The entire shoe can be used as a sandal or a slipper, making it a dual-purpose shoe that is flexible in use. It also has a flat shape when carried, making it convenient for users to take out. When switching between sandals and slippers, simply fold the inner loop forward, making the switching operation convenient.

[0031] Second, multiple V-shaped through grooves 322 are provided on the outer loop 32, so that the outer loop 32 can bend more smoothly and has a certain curvature, preventing the outer loop 32 from flipping and breaking.

[0032] Third, by using the lower straight part 431 and the convex arc part 431a, the front cylindrical rod 21 and the rear cylindrical rod 324 can be fixed in the fastener, making it less prone to slippage and improving wearing comfort.

[0033] In this new type of shoe, the inner loop and the front loop can be fastened together by fastener 4, and the rear loop can be pulled back to be used as a sandal loop. Whether the inner loop or the outer loop is used with the fastener, it can achieve the function of switching between slippers and sandals.

[0034] The product form of this utility model is not limited to the illustrations and embodiments in this case. Any appropriate changes or modifications made to it based on similar ideas should be considered as not departing from the patent scope of this utility model.

Claims

1. A portable flip-flop / sandal, comprising a sole plate, a front strap, and a rear strap, wherein the front strap is connected to the left and right sides of the front end of the sole plate, and the rear strap is connected to the left and right sides of the rear end of the sole plate; the upward-folding front and rear straps are connected together by a connecting structure; characterized in that: The rear shoe loop has an inner loop body and an outer loop body. Both the outer loop body and the inner loop body are arc-shaped bands. The rear end of the sole plate, the inner loop body and the outer loop body are sequentially nested from the inside to the outside. There is a gap between the inner loop body and the sole plate and between the outer loop body and the inner loop body. The left and right side walls of the rear end of the sole plate are respectively provided with connecting blocks in front of the rear shoe loop. The two ends of the outer loop body and the inner loop body are integrally formed and connected to the two connecting blocks. The connecting blocks are provided with a rear folding structure for easy folding of the connecting blocks. The outer loop and the front shoe loop are connected together by the aforementioned connecting structure, or the inner loop and the front shoe loop are connected together by the aforementioned connecting structure.

2. The portable sandal-shoe of claim 1, wherein: The outer loop body is provided with an outward folding structure that makes it easy to fold upwards.

3. The portable sandal-shoe of claim 2, wherein: The aforementioned inner loop body is provided with an inward folding structure that makes it easy to fold upwards.

4. The portable sandal-shoe of claim 1, wherein: The rear end of the aforementioned connecting block has a folding gap with the sole plate, and the folding gap is located in front of and connected to the gap between the sole plate and the inner loop.

5. The portable sandal-shoe of claim 1, wherein: The aforementioned connection structure is a hollow fastener. The fastener has a locking structure in which the front shoe loop, outer loop, and inner loop can be respectively inserted. The front end of the fastener is provided with a front limiting structure that restricts the front shoe loop from moving back and forth and from falling out of the fastener. The rear end of the fastener is provided with a rear limiting structure that restricts the outer loop from moving back and forth and from falling out of the fastener.

6. The portable sandal-shoe of claim 3, wherein: Both ends of the aforementioned inner loop body have a recessed inner V-shaped groove on the top and bottom surfaces that penetrates the inner and outer sides of the inner loop body. The two inner V-shaped grooves constitute the inner folding structure. Both ends of the aforementioned outer loop body have a recessed outer V-shaped groove on the top and bottom surfaces that penetrates the inner and outer sides of the outer loop body. The two outer V-shaped grooves constitute the outer folding structure.

7. The portable sandal-shoe according to claim 6, wherein: The top surface of the aforementioned outer loop body is provided with at least one rear V-shaped through groove behind the outer V-shaped through groove.

8. A portable flip-flop / sandwich shoe according to claim 1, characterized in that: The outer wall of the connecting block is a concave arc surface that curves inward. The outer wall of the front end of the connecting block smoothly transitions with the outer wall of the sole plate. The outer wall of the rear end of the connecting block smoothly transitions with the outer wall of the end of the outer loop. The top surface of the inner loop and the top surface of the outer loop are lower than the top surface of the sole plate. The rear end of the top surface of the connecting block has a downward sloping surface and an upward sloping surface behind the downward sloping surface. The downward sloping surface and the upward sloping surface are connected by an arc surface. The downward sloping surface, the arc surface, and the upward sloping surface form a bending groove. The upward sloping surface smoothly transitions with the top surface of the inner loop and the top surface of the outer loop. The bottom surface of the connecting block is recessed with an arc-shaped through groove that runs through the inside and outside direction. The highest point of the arc-shaped through groove is behind the lowest point of the bending groove. The bending groove and the arc-shaped through groove constitute the aforementioned back folding structure.

9. The portable sandal-shoe of claim 5, wherein: The aforementioned front shoe loop has a front break at the connector to separate the front shoe loop into two loops, and a front cylindrical rod for connecting the two loops is located at the front break. The front end of the fastener has the aforementioned front limiting structure to restrict the front cylindrical rod from moving back and forth and to disengage from the fastener. The aforementioned rear shoe loop has a rear block protruding rearward at the connector. The rear side of the rear block has a strip-shaped through groove that extends vertically and horizontally. The rear block has a rear cylindrical rod integrally formed at this strip-shaped through groove to close the groove opening. The rear end of the fastener has the aforementioned rear limiting structure to restrict the rear cylindrical rod from moving back and forth and to disengage from the fastener.

10. The portable sandal-shoe according to claim 9, wherein: The aforementioned connector has an upper top plate, the front end of which is integrally formed with a downwardly curved front arc plate. The rear side of the front arc plate is recessed forward to form a front concave cavity. The rear end of the upper top plate is integrally formed with a downwardly curved rear arc plate. The free end of the rear arc plate extends forward and upward at an angle, and the free end of the rear arc plate is integrally formed with a forwardly extending lower straight portion. The distance between the lower straight portion and the upper top plate is smaller than the outer diameter of the rear cylindrical rod. The lower straight portion constitutes the rear limiting structure. The front end of the lower straight portion is integrally formed with a downwardly inclined convex arc portion. There is an interlocking gap between the convex arc portion and the rear end of the front arc plate. The width of the interlocking gap is smaller than the outer diameter of the front cylindrical rod and the rear cylindrical rod. This interlocking gap and the convex arc portion constitute the bayonet structure. The front concave cavity and the convex arc portion constitute the front limiting structure.

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