Lunch box

Abstract

The utility model relates to the technical field of meal boxes, in particular to a meal box which comprises a box body, a box cover and a connecting edge used for connecting the box body and the box cover, an inserting tongue is arranged on the box cover, a buckling edge is arranged on the box body, and a clamping hole matched with the inserting tongue is formed in the buckling edge. A protruding part is arranged on the side, located on the outward side of the clamping hole, of the buckling edge in the opening direction of the box body in a protruding mode, the two ends of the protruding part extend to the two ends of the clamping hole, and when the box cover is buckled on the box body, the protruding part can abut against the edge of the box cover. According to the lunch box, the protruding parts are arranged on the buckling edges, the buckling edges are reinforced through the protruding parts, and the strength of the area is guaranteed; the two ends of the protruding part extend to the two ends of the clamping hole, and the design can prevent the buckling edge from generating attractive force concentration in the two end areas of the clamping hole to cause breakage. The protruding part can abut against the edge of the box cover after the whole lunch box is buckled so as to increase the deformation quantity of the inserting tongue, the pre-bent inserting tongue can increase the clamping force of matching of the inserting tongue and the clamping hole, and then the buckling stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of lunch box technology, specifically to a lunch box. Background Technology

[0002] Traditional disposable lunch boxes are typically molded in one piece during the thermoforming process, with tongues and snap-fit ​​holes for easy closure during use. However, current tongue and snap-fit ​​designs are often simplistic, making the boxes prone to popping open after food is added, potentially contaminating the food. Furthermore, the snap-fit ​​areas on existing boxes are prone to becoming weak points, making them susceptible to breakage and detachment during use.

[0003] To address this issue, patent CN204812523U discloses a disposable lunch box with a locking mechanism. This mechanism securely locks the lid to the body, preventing it from opening regardless of the amount of food inside, and also provides dust protection. This solution uses multiple limiting blocks on the latch to prevent it from detaching from the locking hole. While these limiting blocks reduce the risk of the latch detaching, the U-shaped locking hole makes it more prone to breakage during use, thus failing to solve the problem of breakage in the locking hole area. Furthermore, the relatively small size of the limiting blocks requires high-quality molding, especially considering the grooves formed under the latch, resulting in high manufacturing costs due to the numerous structures on the latch. Utility Model Content

[0004] In order to overcome one of the shortcomings of the existing technology, the purpose of this utility model is to provide a lunch box with a simple structure, a stable fastening, and a chain that is not prone to breakage in the area around the buckle hole.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A lunch box includes a box body, a box lid, and a connecting edge for connecting the box body and the box lid. The box lid is provided with a tongue, and the box body is provided with a fastening edge. The fastening edge is provided with a locking hole that mates with the tongue. On the side of the fastening edge located outward of the locking hole, a protrusion is provided along the opening direction of the box body. The two ends of the protrusion extend to the two ends of the locking hole. When the box lid is fastened to the box body, the protrusion can abut against the edge of the box lid.

[0007] Furthermore, the protrusion is arc-shaped and its two ends are positioned on the outer sides of the two ends of the card hole.

[0008] Furthermore, at least a portion of the periphery of the protrusion is tangent to the edge of the card hole.

[0009] Furthermore, both ends of the card hole are tangent to the periphery of the protrusion.

[0010] Furthermore, the area enclosed by the fastening edge between the edge of the card hole and the periphery of the protrusion forms a deformation zone, and the back side of the deformation zone smoothly transitions to the back side of the protrusion.

[0011] Furthermore, the length of the protrusion is greater than the length of the card hole.

[0012] Furthermore, both the lid and the body of the box have outwardly extending fitting edges, and the fitting edges on the body of the box are smoothly connected and transitioned to the fastening edges.

[0013] Furthermore, the fit of the lid on both sides of the tongue gradually indents inward along the direction close to the tongue.

[0014] Furthermore, the height of the protrusion is greater than the thickness of the box body and the lid.

[0015] Furthermore, the cross-section of the connecting edge is W-shaped.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model discloses an improved lunchbox based on existing lunchboxes. A raised portion is provided on the side of the fastening edge facing outwards from the latch hole, protruding along the opening direction of the box body. This raised portion strengthens the fastening edge, ensuring the strength of this area. Simultaneously, both ends of the raised portion extend to the ends of the latch hole. This design prevents stress concentration at the ends of the latch edge, thus avoiding breakage. Furthermore, the raised portion also presses against the edge of the lid after the entire lunchbox is fastened, increasing the deformation of the latch. The pre-bent latch increases the locking force between the latch and the latch hole, thereby increasing the stability of the fastening and preventing the lid and box body from loosening.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure in the open state of an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure in the snap-fit ​​state of an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the tongue and the locking hole in an embodiment of the present invention;

[0022] Figure 4This is a schematic diagram of the structure in the snap-fit ​​state of another embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] Reference Figures 1 to 4 The lunch box shown includes a box body 10, a box lid 20, and a connecting edge 30 for connecting the box body 10 and the box lid 20. The box lid 20 is provided with a tongue 21, and the box body 10 is provided with a fastening edge 11. The fastening edge 11 is provided with a locking hole 12 that mates with the tongue 21. The fastening edge 11 has a protruding part 13 on the side of the locking hole 12 that protrudes outward along the opening direction of the box body 10. The two ends of the protruding part 13 extend to the two ends of the locking hole 12. When the box lid 20 is fastened to the box body 10, the protruding part 13 can abut against the edge of the box lid 20.

[0025] The box body 10, lid 20, and connecting edge 30 are integrally thermoformed, and can be obtained by thermoforming materials such as pulp and polyethylene. In this application, the protrusion 13 is also formed together with other components during the thermoforming process. The width of the outward end of the tongue 21 is smaller than the width of its root. This is mainly to prevent the tongue 21 from breaking and to enhance its strength, so as to provide strong deformation force to facilitate the fastening of the box body 10 and the lid 20. In order to provide a restoring force, the cross-section of the connecting edge 30 is W-shaped. This design allows the connecting edge 30 to provide an upward force after the box body 10 and the lid 20 are fastened, so that the tongue 21 can be firmly fastened to the locking hole 12.

[0026] This lunchbox is an improvement on existing lunchboxes. A protrusion 13 is provided on the side of the fastening edge 11 facing outwards from the latch hole 12, along the opening direction of the box body 10. The protrusion 13 strengthens the fastening edge 11, ensuring the strength of this area. Simultaneously, both ends of the protrusion 13 extend to both ends of the latch hole 12. This design prevents the fastening edge 11 from experiencing concentrated force at both ends of the latch hole 12, thus avoiding breakage. Furthermore, the protrusion 13 can press against the edge of the lid 20 after the entire lunchbox is fastened, increasing the deformation of the latch 21. The pre-bent latch 21 increases the locking force between the latch 21 and the latch hole 12, thereby increasing the stability of the fastening and preventing the lid 20 and the box body 10 from loosening.

[0027] In one of the improved embodiments described above, to facilitate product molding and reduce the complexity of the molding die, the protrusion 13 is arc-shaped with both ends positioned on the outer sides of the two ends of the latch hole 12. The arc-shaped design, to a certain extent, strengthens the fastening edge 11 more easily than a traditional single-direction reinforcement structure, while its continuous structural design ensures aesthetics. Furthermore, in the above embodiment, the arc-shaped protrusion 13 can abut against a larger area when the lid 20 is fastened to the box body 10, causing a larger area of ​​the lid 20 to deform and ensuring the stability of the fastening.

[0028] It should be noted that the protrusion design of the protrusion 13 allows the lid 20 to deform in the area around the tongue 21, providing a more secure fit between the tongue 21 and the slot 12 compared to traditional lunch boxes, thus providing a higher locking force.

[0029] In the above-described improved embodiment, at least a portion of the periphery of the protrusion 13 is tangent to the edge of the slot 12. More specifically, both ends of the slot 12 are tangent to the periphery of the protrusion 13. This design allows the cover 20 of the tongue 21 to engage more closely with the protrusion 13 in the area surrounding the tongue 21 after the tongue 21 is inserted into the slot 12. Since the cover 20 is relatively thinner, only a closer distance can provide a greater deformation force to enhance the frictional force of the engagement between the tongue 21 and the slot 12.

[0030] In order to improve the deformation area 14 formed by the area between the edge of the buckle 11 and the periphery of the protrusion 13, the back side of the deformation area 14 is smoothly transitioned to the back side of the protrusion 13.

[0031] See Figures 2 to 3 In the above embodiments, to ensure a secure and stable fastening of the entire lunchbox, prevent food leakage, and enhance the strength of the lunchbox, both the lid 20 and the body 10 have outwardly extending fitting edges 22. The fitting edges 22 on the body 10 are smoothly connected to the fastening edges 11. When the lid 20 and body 10 are fastened together, the fitting edges 22 on both sides of the latch 21 abut against the protrusion 13 to enhance the deformation force of the latch 21 and its surrounding area, ensuring a stable fastening.

[0032] In the above embodiment, in order to increase the contact area with the fitting edge 22, the length of the protrusion 13 is greater than the length of the card hole 12. Furthermore, to ensure deformation force, the protrusion height of the protrusion 13 is greater than the thickness of the box body 10 and the box cover 20.

[0033] See Figure 4In an improved embodiment, when an excessive pre-deformation force is not required to be applied to the tongue 21, the fitting edge 22 can also directly abut against the side of the protrusion 13, and the gradually increasing side of the protrusion 13 can be used to deform the fitting edge 22, which can also provide a force to the tongue 21.

[0034] Of course, in some improved embodiments, bending does not require the protrusion 13 to provide support for deformation of the fitting edge 22. The fitting edges 22 on both sides of the latch 21 of the lid 20 gradually concave inwards towards the latch 21. This design allows the fitting edges 22 on both sides of the latch 21 to not contact the top of the protrusion 13, but only partially contact the sides of the protrusion 13. In this way, the protrusion 13 only restricts the tendency of the latch 21 to move outwards in the horizontal direction. Combined with the prestress applied by the connecting edge 30, the lid 20 itself can bend upwards and bulge, thereby applying force to both sides in the opposite direction and ensuring the stability of the fastening.

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A lunch box, comprising a box body, a box lid, and a connecting edge for connecting the box body and the box lid, characterized in that, The lid is provided with a tongue, the box body is provided with a fastening edge, the fastening edge is provided with a locking hole that engages with the tongue, and the fastening edge is provided with a protrusion on the side of the locking hole facing outward along the opening direction of the box body. The two ends of the protrusion extend to the two ends of the locking hole. When the lid is fastened to the box body, the protrusion can abut against the edge of the lid.

2. A lunch box according to claim 1, characterized in that: The protrusion is arc-shaped and its two ends are positioned on the outer sides of the two ends of the card hole.

3. A lunch box according to claim 1, characterized in that: At least a portion of the periphery of the protrusion is tangent to the edge of the card hole.

4. A lunch box according to claim 3, characterized in that: Both ends of the card hole are tangent to the periphery of the protrusion.

5. A lunch box according to claim 4, characterized in that: The area enclosed by the fastening edge between the edge of the card hole and the periphery of the protrusion forms a deformation zone, and the back side of the deformation zone smoothly transitions to the back side of the protrusion.

6. A lunch box according to claim 1, characterized in that: The length of the protrusion is greater than the length of the card hole.

7. A lunch box according to any one of claims 1-6, characterized in that: Both the lid and the body of the box have outwardly extending fitting edges, and the fitting edges on the body of the box are smoothly connected and transitioned to the fastening edges.

8. A lunch box according to claim 7, characterized in that: The fit of the lid on both sides of the tongue gradually indents inward along the direction close to the tongue.

9. A lunch box according to any one of claims 1-6, characterized in that: The height of the protrusion is greater than the thickness of the box body and the box lid.

10. A lunch box according to claim 1, characterized in that: The cross-section of the connecting edge is W-shaped.

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