Cup cover
By designing a ring-shaped buckle structure and an inner and outer misaligned reinforcing component on the inner wall of the polygonal cup lid, the problem of the cup lid being soft and difficult to open is solved, making the cup lid easier to open while being less prone to deformation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA YILI IND GROUP CO LTD
- Filing Date
- 2025-04-11
- Publication Date
- 2026-04-17
AI Technical Summary
Existing cup lids are soft and difficult to open, especially square cup lids, which are prone to deformation and difficult to open.
Design a polygonal cup lid with an inner wall featuring a ring-shaped snap-fit structure, including a first snap-fit structure and a second snap-fit structure. The first snap-fit structure protrudes less than the second snap-fit structure. A reinforcing component with an inner and outer misalignment is provided on the top of the lid to enhance its strength.
Through the design of the ring-shaped buckle structure and reinforced components, the cup lid is not easily deformed when opened, making it easy to open and solving the problem of existing cup lids being soft and difficult to open.
Smart Images
Figure CN224131750U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cup lids, and more particularly to a cup lid. Background Technology
[0002] Currently, most cup-type products come with a lid, which is attached to the cup. The lid serves two main purposes: firstly, the cavity inside the lid can hold utensils such as spoons; secondly, when food cannot be finished at once, the lid can be placed on top of the cup to prevent dust accumulation. However, the presence of lids also brings some problems for manufacturers and consumers. Some square lids are too soft and easily deformed, and the presence of four corners makes them particularly difficult to open. When trying to open one corner, the other three corners are often firmly stuck, making it very difficult to open. Utility Model Content
[0003] The purpose of this invention is to provide a cup lid that solves the problems of existing cup lids being soft and difficult to open.
[0004] The purpose of this utility model is achieved as follows: a cup lid includes a polygonal lid body that is closed at the top and open at the bottom. An annular buckle structure protrudes inward on the inner sidewall of the polygonal lid body. The annular buckle structure includes multiple first buckle structures and multiple second buckle structures. The multiple first buckle structures are respectively set at multiple corner positions of the polygonal lid body. The second buckle structures are connected between two adjacent first buckle structures, and the height of the first buckle structure protruding from the inner sidewall of the polygonal lid body is less than the height of the second buckle structure protruding from the inner sidewall of the polygonal lid body. The center of the top wall of the polygonal lid body is recessed downward to form a recessed structure, and the outer ring of the top wall of the polygonal lid body is recessed upward to form an outer ring protrusion structure surrounding the outer periphery of the recessed structure. The outer ring protrusion structure includes multiple sets of reinforcing components. Each set of reinforcing components includes a first protrusion and a second protrusion. At least a portion of the second protrusion surrounds at least a portion of the first protrusion.
[0005] In a preferred embodiment of this utility model, the height of the first snap-fit structure protruding from the inner wall of the polygonal cover is 0.1-0.5mm, and the height of the second snap-fit structure protruding from the inner wall of the polygonal cover is 0.5-1mm.
[0006] In a preferred embodiment of the present invention, both the first snap-fit structure and the second snap-fit structure are protruding ridges, and the outer surface of the protruding ridge includes a top sloping transition arc surface, a connecting surface and a bottom sloping transition arc surface connected in sequence.
[0007] In a preferred embodiment of the present invention, the connecting surface in the second snap-fit structure is an arc-shaped connecting surface, and the thickness of the second snap-fit structure along the axial direction of the polygonal cover gradually decreases from the inner sidewall of the polygonal cover inward.
[0008] In a preferred embodiment of the present invention, the top surfaces of the first protrusion and the second protrusion are both arc surfaces, and the height of the top surfaces of the first protrusion and the second protrusion relative to the plane where the bottom opening of the polygonal cover is located gradually decreases from one end to the other.
[0009] In a preferred embodiment of this utility model, multiple sets of reinforcing components are arranged sequentially along the circumference of the outer ring protrusion structure. The number of sets of reinforcing components is the same as the number of sides of the polygonal cover. The first end of the first protrusion and the first end of the second protrusion of each set of reinforcing components are respectively located at two adjacent corners of the polygonal cover. The first end of the first protrusion of each set of reinforcing components is connected to the first end of the second protrusion of the adjacent reinforcing component at the corresponding corner of the polygonal cover. The second end of the first protrusion of each set of reinforcing components extends to a position close to the first end of the second protrusion, and the second end of the second protrusion extends to a position close to the first end of the first protrusion.
[0010] In a preferred embodiment of the present invention, the width of the first protrusion gradually decreases from its first end to its second end, and the width of the second protrusion gradually decreases from its first end to its second end.
[0011] In a preferred embodiment of the present invention, a plurality of rib structures are provided circumferentially on the inner sidewall of the polygonal cover and above the annular buckle structure, and the rib structures are connected to the top inner wall of the polygonal cover.
[0012] In a preferred embodiment of this utility model, the sidewall of the polygonal lid includes an upper sidewall, an upper transition sidewall, a middle sidewall, a lower transition sidewall, and a lower sidewall connected sequentially from its top to its bottom, with the diameters of the upper sidewall, the middle sidewall, and the lower sidewall increasing sequentially; an annular snap-fit structure is formed on the middle sidewall, or the upper and lower parts of the annular snap-fit structure are formed on the middle sidewall and the lower transition sidewall, respectively; when the lid and the cup body are assembled, the rim of the cup body can be snapped between the annular snap-fit structure and the upper transition sidewall.
[0013] In a preferred embodiment of this utility model, the polygonal cover is a square cover.
[0014] As described above, the cup lid of this invention, through the design of the annular snap-fit structure on the inner wall, ensures that the protrusion of the first snap-fit structure at each corner of the polygonal cup lid is less than the protrusion of the second snap-fit structure at other locations. This facilitates the cup rim disengaging from one corner of the lid when opening. Simultaneously, the staggered arrangement of the first and second protrusions in the outer ring of the top of the polygonal lid strengthens the overall strength of the lid, making it less prone to deformation. Consequently, after the cup rim disengages from one corner, the upward force on the remaining cup rims will also disengage from the annular snap-fit structure, making it relatively easier to open. This solves the problems of existing cup lids being soft and difficult to open. Attached Figure Description
[0015] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:
[0016] Figure 1 Schematic diagram of the structure of the cup lid provided by this utility model Figure 1 .
[0017] Figure 2 Schematic diagram of the structure of the cup lid provided by this utility model Figure 2 .
[0018] Figure 3 for Figure 2 Top view.
[0019] Figure 4 This is a schematic diagram of the cup.
[0020] Figure 5 A schematic diagram of the cup lid and cup body after being fastened together according to this utility model. Figure 1 .
[0021] Figure 6 for Figure 5 A magnified view of a portion of the image.
[0022] Figure 7 A schematic diagram of the cup lid and cup body after being fastened together according to this utility model. Figure 2 .
[0023] Figure 8 A cross-sectional view of the cup lid and cup body after they are fastened together at the second snap-fit structure, provided by this utility model.
[0024] Figure 9 for Figure 8 A magnified view of a portion of the image.
[0025] Figure 10 A cross-sectional view of the cup lid and cup body after they are fastened together at the first snap-fit structure, as provided by this utility model.
[0026] Explanation of icon numbers:
[0027] 100. Cup lid;
[0028] 1. Polygonal cover; 11. Upper sidewall; 12. Upper transition sidewall; 13. Middle sidewall; 14. Lower transition sidewall; 15. Lower sidewall;
[0029] 2. Ring-shaped buckle structure; 21. First buckle structure; 22. Second buckle structure; 23. Top sloping transition arc surface; 24. Connecting surface; 25. Bottom sloping transition arc surface;
[0030] 3. Recessed structure;
[0031] 4. Outer ring protrusion structure; 41. Reinforcing component; 411. First protrusion; 412. Second protrusion;
[0032] 5. Rib structure;
[0033] 200. Cup body; 201. Cup rim. Detailed Implementation
[0034] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.
[0035] like Figures 1 to 10 As shown, this embodiment provides a cup lid 100, including a polygonal lid 1 that is closed at the top and open at the bottom. An annular buckle structure 2 is provided protruding inward on the inner sidewall of the polygonal lid 1. The annular buckle structure 2 includes multiple first buckle structures 21 and multiple second buckle structures 22. The multiple first buckle structures 21 are respectively set at multiple corner positions of the polygonal lid 1. The second buckle structures 22 are connected between two adjacent first buckle structures 21. The height of the first buckle structure 21 protruding from the inner sidewall of the polygonal lid 1 is less than the height of the second buckle structure 22 protruding from the inner sidewall of the polygonal lid 1. The top wall center of the polygonal lid 1 is recessed downward to form a recessed structure 3. The outer ring of the top wall of the polygonal lid 1 is recessed upward to form an outer ring protrusion structure 4 surrounding the outer periphery of the recessed structure 3. The outer ring protrusion structure 4 includes multiple sets of reinforcing components 41. Each set of reinforcing components 41 includes a first protrusion 411 and a second protrusion 412. At least a portion of the second protrusion 412 surrounds at least a portion of the first protrusion 411.
[0036] The polygonal lid 1 is a hollow structure with an open bottom, enclosed by a top wall and side walls. The side walls are formed by multiple sidewall surfaces, and their outer contours are polygonal. The entire polygonal lid 1 has a polygonal cross-section along its axial direction; this polygon can be an equilateral triangle, square, rectangle, etc. The recessed structure 3 formed by the top outer wall of the polygonal lid 1 constitutes a groove, and the bottom of this groove is also polygonal. The recessed structure 3 also increases the strength of the lid 100. The annular snap-fit structure 2 is a solid convex ring formed by the inward protrusion of the inner surface of the side wall of the polygonal lid 1, with the degree of protrusion at each corner of the polygonal lid 1 being less than the degree of protrusion at other locations.
[0037] The outer ring protrusion structure 4 formed by the top outer wall of the polygonal cover 1 is annular. Multiple sets of reinforcing components 41 are arranged sequentially along the circumference of the outer ring protrusion structure 4. The first protrusion 411 and the second protrusion 412 are both protrusion structures formed by the upward indentation of part of the top wall of the polygonal cover 1. The first protrusion 411 and the second protrusion 412 are both elongated protrusion structures, and their length directions are roughly along the circumference of the outer ring protrusion structure 4. The first protrusion 411 is arranged close to the recessed structure 3, and part of the outer wall of the first protrusion 411 constitutes part of the groove sidewall of the recessed structure 3. The second protrusion 412 can be entirely surrounding the outer periphery of the first protrusion 411, or a part of the second protrusion 412 can surround part of the outer periphery of the first protrusion 411 (e.g., Figure 1 As shown, the first protrusion 411 and the second protrusion 412 form an inner and outer misaligned structure along the line connecting the center of the recessed structure 3 to the corresponding side groove wall, and the two are arranged side by side in this line direction.
[0038] Taking the polygonal lid 1 as an example of a square lid, this square lid has four corner positions. In use, when the lid 100 is fastened to the cup body 200, the rim 201 of the cup body 200 is engaged with the upper part of the annular snap-fit structure 2. When opening the lid, consumers generally start from the four corners. Because the protrusion of the first snap-fit structure 21 at the four corners is small, and the interference fit with the rim 201 is small, it is easy to open one corner with relatively little force. Since the first protrusion 411 and the second protrusion 412 in the outer ring protrusion structure 4 at the top of the polygonal lid 1 are staggered, the strength of the entire upper part of the lid 100 is increased, making the lid 100 less prone to deformation when opened. Because the lid 100 is less prone to deformation, after one corner of the lid 100 is opened, the rims 201 at the remaining positions will disengage from the annular snap-fit structure 2 under the action of force. Compared to lids without a misalignment structure, the cup lid 100 is too soft. After one corner is opened, the lid deforms, and the rim 201 of the cup is not easy to disengage from the latch, making the lid difficult to open.
[0039] Therefore, in this embodiment, the cup lid 100, through the design of the annular snap-fit structure 2 on the inner wall, ensures that the protrusion of the first snap-fit structure 21 at each corner of the polygonal cup lid 100 is less than the protrusion of the second snap-fit structure 22 at other positions. This facilitates the cup rim 201 of the cup body 200 disengaging from one corner of the cup lid 100 when opening. Simultaneously, by arranging the first protrusion 411 and the second protrusion 412 in the outer ring protrusion structure 4 at the top of the polygonal lid 1 in a staggered manner, the overall strength of the cup lid 100 is enhanced, making it less prone to deformation. Consequently, after the cup rim 201 disengages from one corner of the cup lid 100, the upward force on the cup rims 201 at other positions will also disengage from the annular snap-fit structure 2, making it relatively easier to open. This solves the problem of existing cup lids 100 being soft and difficult to open.
[0040] In an optional embodiment, the first snap-fit structure 21 protrudes from the inner wall of the polygonal lid 1 by 0.1-0.5 mm, and the second snap-fit structure 22 protrudes from the inner wall of the polygonal lid 1 by 0.5-1 mm, to ensure that the lid 100 securely holds the cup 200 in place and prevents the cup 200 from falling off. Of course, the specific protrusion height depends on actual needs.
[0041] In some embodiments, refer to Figure 2 , Figure 9 and Figure 10 Both the first snap-fit structure 21 and the second snap-fit structure 22 are protruding ridges, and the outer surface of the protruding ridge includes a top sloping transition arc surface 23, a connecting surface 24 and a bottom sloping transition arc surface 25 connected in sequence.
[0042] The top sloping transition arc surface 23 faces the top inner wall of the polygonal cover 1, while the bottom sloping transition arc surface 25 faces away from the top inner wall of the polygonal cover 1. The top sloping transition arc surface 23 is inclined from the outside of the side wall of the polygonal cover 1 towards the bottom of the hollow inner cavity, while the bottom sloping transition arc surface 25 is inclined from the outside of the side wall of the polygonal cover 1 towards the top of the hollow inner cavity. The first snap-fit structure 21 and the second snap-fit structure 22 are connected by the transition arc surface.
[0043] The design of the convex ridge adopts the transition of the upper and lower arc surfaces, which can ensure that when the lid is closed, the cup edge 201 can easily slide along the arc surface below the convex ridge (i.e., the bottom sloping transition arc surface 25) to the top of the convex ridge to close the lid, and when the lid is opened, the cup edge 201 slides along the arc surface above the convex ridge (i.e., the top sloping transition arc surface 23) to the bottom of the convex ridge to open the lid.
[0044] Optionally, the connecting surface 24 in the second snap-fit structure 22 is an arc-shaped connecting surface, and the thickness of the second snap-fit structure 22 along the axial direction of the polygonal cover 1 gradually decreases from the inner sidewall of the polygonal cover 1 inwards. (Refer to...) Figure 8 and Figure 9 The second snap-fit structure 22 has a longitudinal section along the axial direction of the polygonal lid 1 that is roughly a triangle with an arc at the tip. This allows the lid 100 to better hold the cup body 200 after it is snapped together with the cup body 200, and also facilitates the operation of snapping on and off the lid.
[0045] Optionally, the first snap-fit structure 21 has a small protrusion, the connecting surface 24 of the first snap-fit structure 21 can be an arc surface or a plane, and the thickness of the first snap-fit structure 21 along the axial direction of the polygonal cover 1 can be a uniform thickness.
[0046] Furthermore, the first protrusion 411 and the second protrusion 412 can be designed as flush structures or as non-flush structures. For example, in some optional embodiments, the top surfaces of the first protrusion 411 and the second protrusion 412 are both planar, forming a flush structure. In some optional embodiments, the top surfaces of the first protrusion 411 and the second protrusion 412 are both irregular curved surfaces.
[0047] In some preferred embodiments, refer to Figure 1 The top surfaces of the first protrusion 411 and the second protrusion 412 are both arc surfaces, and the height of the top surfaces of the first protrusion 411 and the second protrusion 412 relative to the plane where the bottom opening of the polygonal cover 1 is located gradually decreases from one end to the other.
[0048] In this embodiment, the first protrusion 411 and the second protrusion 412 in each set of reinforcing components 41 are non-flush structures, and the top surfaces of the first protrusion 411 and the second protrusion 412 both form a transition arc surface from top to bottom, which is a curved surface structure; refer to Figure 1 Viewed from the side of the polygonal lid 1, the first protrusion 411 and the second protrusion 412 are staggered vertically. Due to the internal and external staggered structure and the vertical staggered structure formed by the first protrusion 411 and the second protrusion 412 in each set of reinforcing components 41, as well as the curved surface structure, the strength of the upper part of the cup lid 100 can be significantly improved, making the cup lid 100 less prone to deformation when opened.
[0049] Furthermore, the distribution positions of the two ends of the first protrusion 411 and the second protrusion 412 can be designed according to actual needs. For example, in a specific embodiment, referring to... Figure 1Multiple sets of reinforcing components 41 are arranged sequentially along the circumference of the outer ring protrusion structure 4. The number of sets of reinforcing components 41 is the same as the number of sides of the polygonal lid 1. The first end of the first protrusion 411 and the first end of the second protrusion 412 of each set of reinforcing components 41 are respectively located at two adjacent corners of the polygonal lid 1. The first end of the first protrusion 411 of each set of reinforcing components 41 is connected to the first end of the second protrusion 412 of the adjacent reinforcing component 41 at the corresponding corner of the polygonal lid 1. The second end of the first protrusion 411 of each set of reinforcing components 41 extends to a position close to the first end of the second protrusion 412, and the second end of the second protrusion 412 extends to a position close to the first end of the first protrusion 411. In this embodiment, optionally, the width of the first protrusion 411 gradually decreases from its first end to its second end, and the width of the second protrusion 412 gradually decreases from its first end to its second end, which can make the cup lid 100 more aesthetically pleasing.
[0050] Furthermore, refer to Figure 2 On the inner wall of the polygonal cover 1 and above the annular buckle structure 2, a plurality of rib structures 5 are provided at circumferential intervals. The rib structures 5 are connected to the top inner wall of the polygonal cover 1.
[0051] The rib structure 5 can abut against the top outer wall of the polygonal lid 1 of another cup lid 100, that is, against the top surface of the outer ring protrusion structure 4. The rib structure 5 can be, for example, a rectangular plate, and is connected to both the side walls and the top wall of the polygonal lid 1. The specific number of rib structures 5 can be designed according to actual needs.
[0052] When multiple cup lids 100 are stacked with their bottom openings facing downwards, the rib structure 5 of the upper cup lid 100 can overlap the top surface of the lower cup lid 100 (that is, overlap the first protrusion 411 or the second protrusion 412 of the lower cup lid 100), ensuring that the stacking height of the lids is consistent and facilitating automated lid closing on the equipment. At the same time, the rib structure 5 also ensures that there is a certain gap between the cup lids 100 after multiple cup lids 100 are stacked, preventing them from locking together. The rib structure 5 also increases the strength of the cup lids 100 to a certain extent, making them less prone to deformation.
[0053] Furthermore, refer to Figure 6 as well as Figures 8 to 10 The sidewalls of the polygonal cover 1 include an upper sidewall 11, an upper transition sidewall 12, a middle sidewall 13, a lower transition sidewall 14, and a lower sidewall 15 connected sequentially from its top to its bottom, with the diameters of the upper sidewall 11, middle sidewall 13, and lower sidewall 15 increasing sequentially; an annular snap-fit structure 2 is formed on the middle sidewall 13, or the upper and lower parts of the annular snap-fit structure 2 are formed on the middle sidewall 13 and the lower transition sidewall 14, respectively (e.g., Figures 8 to 10When the lid 100 and the cup body 200 are assembled, the rim 201 of the cup body 200 can be engaged between the annular snap-fit structure 2 and the upper transition sidewall 12.
[0054] Both the upper transition sidewall 12 and the lower transition sidewall 14 are inclined surfaces. Generally, the diameter of the upper sidewall 11 gradually increases from top to bottom, while the middle sidewall 13 is a cylindrical surface. The diameter of the lower sidewall gradually increases from top to bottom, which makes it easier to close and open the lid.
[0055] In actual use, the lid 100 can be placed on a cup body 200. The sidewall at the top opening of the cup body 200 extends outward to form an enlarged rim 201. The rim 201 has a ring-shaped planar structure. The rim 201 can be flush with the end face of the top opening of the cup body 200, or it can be spaced apart from the end face of the top opening (e.g., Figure 4 (As shown). When assembling the lid 100 and the cup body 200, refer to... Figures 8 to 10 The rim 201 can be engaged in the area between the annular snap-fit structure 2 and the upper transition sidewall 12 to stably limit the rim 201 of the cup body 200.
[0056] The entire cup lid 100 can be applied to food packaging, such as any food dustproof cup lid 100.
[0057] In summary, the cup lid 100 has different degrees of protrusion of the first snap structure 21 and the second snap structure 22 in the annular snap structure 2. At the same time, the first protrusion 411 and the second protrusion 412 in the reinforcing component 41 form an internal and external misalignment to improve the overall strength of the cup body 200, making the lid less prone to deformation. This allows even polygonal cup lids 100, such as square cup lids, to be opened more easily.
[0058] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.
Claims
1. A cup lid, characterized in that, The device includes a polygonal cover that is closed at the top and open at the bottom. An annular buckle structure protrudes inward on the inner wall of the polygonal cover. The annular buckle structure includes multiple first buckle structures and multiple second buckle structures. The multiple first buckle structures are respectively set at multiple corner positions of the polygonal cover. The second buckle structure is connected between two adjacent first buckle structures. The height of the first buckle structure protruding from the inner wall of the polygonal cover is less than the height of the second buckle structure protruding from the inner wall of the polygonal cover. The top wall of the polygonal cover is recessed downward to form a recessed structure, and the outer ring of the top wall of the polygonal cover is recessed upward to form an outer ring protrusion structure surrounding the recessed structure. The outer ring protrusion structure includes multiple sets of reinforcing components, each set of reinforcing components including a first protrusion and a second protrusion, with at least a portion of the second protrusion surrounding at least a portion of the first protrusion.
2. The cup lid as described in claim 1, characterized in that, The first snap-fit structure protrudes from the inner wall of the polygonal cover by 0.1-0.5 mm, and the second snap-fit structure protrudes from the inner wall of the polygonal cover by 0.5-1 mm.
3. The cup lid as described in claim 1, characterized in that, Both the first and second snap-fit structures are protruding ridges, and the outer surface of the protruding ridge includes a top sloping transition arc surface, a connecting surface, and a bottom sloping transition arc surface that are connected in sequence.
4. The cup lid as described in claim 3, characterized in that, The connecting surface in the second snap-fit structure is an arc-shaped connecting surface, and the thickness of the second snap-fit structure along the axial direction of the polygonal cover gradually decreases from the inner sidewall of the polygonal cover inward.
5. The cup lid as described in claim 1, characterized in that, The top surfaces of both the first and second protrusions are curved, and the height of the top surfaces of the first and second protrusions relative to the plane containing the bottom opening of the polygonal cover gradually decreases from one end to the other.
6. The cup lid as described in claim 1, characterized in that, Multiple sets of the reinforcing components are arranged sequentially along the circumference of the outer ring protrusion structure. The number of sets of the reinforcing components is the same as the number of sides of the polygonal cover. The first end of the first protrusion and the first end of the second protrusion of each set of the reinforcing components are respectively located at two adjacent corners of the polygonal cover. The first end of the first protrusion of each set of the reinforcing components is connected to the first end of the second protrusion of the adjacent reinforcing component at the corresponding corner of the polygonal cover. The second end of the first protrusion of each set of the reinforcing components extends to a position close to the first end of the second protrusion, and the second end of the second protrusion extends to a position close to the first end of the first protrusion.
7. The cup lid as described in claim 6, characterized in that, The width of the first protrusion gradually decreases from its first end to its second end, and the width of the second protrusion gradually decreases from its first end to its second end.
8. The cup lid as described in claim 1, characterized in that, On the inner wall of the polygonal cover and above the annular buckle structure, a plurality of rib structures are provided at circumferential intervals, and the rib structures are connected to the top inner wall of the polygonal cover.
9. The cup lid as described in claim 1, characterized in that, The sidewalls of the polygonal lid include an upper sidewall, an upper transition sidewall, a middle sidewall, a lower transition sidewall, and a lower sidewall connected sequentially from top to bottom, with the diameters of the upper sidewall, the middle sidewall, and the lower sidewall increasing sequentially; the annular snap-fit structure is formed on the middle sidewall, or the upper and lower parts of the annular snap-fit structure are formed on the middle sidewall and the lower transition sidewall, respectively; when the lid and the cup body are assembled, the rim of the cup body can be snapped between the annular snap-fit structure and the upper transition sidewall.
10. The cup lid as described in claim 1, characterized in that, The polygonal cover is a square cover.