Glue-free mortise lock paper box

Abstract

A glue-free mortise lock paper box comprises a bottom plate and four side plates connected with the bottom plate in a folding line mode, the four side plates comprise the two first side plates arranged oppositely and the two second side plates arranged oppositely, and the two side edges of each first side plate are connected with a first folding piece in the direction of the adjacent second side plate in a folding line mode. The two side edges of the second side plate are connected with second folding pieces in a folding line mode in the direction of the adjacent first side plate, the first folding pieces and the second folding pieces are connected through folding lines, the second folding pieces further extend to form clamping pieces in the outer side area of the folding lines, and two clamping openings are correspondingly formed in the first side plate. The first folding piece and the second folding piece are folded along the folding line and then located on the outer side of the side plate, and the clamping piece is inserted into the clamping opening to be positioned after the second folding piece is bent towards the first side plate. The outer side of the folding line extends towards the top edge of the second folding piece to form a folding line, and the clamping piece is located on the top edge of the second folding piece and located outside the folding line. The folding packaging box is simple in structure and easy and fast to fold and package.

Description

Technical Field

[0001] This utility model relates to the field of paper packaging box technology, and in particular to a glue-free interlocking paper box. Background Technology

[0002] Compared to ordinary plastic bags, cardboard boxes have a fixed-shape cavity, which can more completely store items that are easily deformed by pressure, such as cakes, bread, French fries, and fried chicken. They are frequently used in the food delivery industry.

[0003] Many existing paper packaging boxes are stacked together before use, which is inconvenient for handling and transportation due to the limited number of stacked boxes. Although there are methods that involve directly folding the cardboard, many side panels of the box need to be glued and fixed in place for shaping, which increases the process and reduces operational efficiency. Even if glue is not needed, the side panels of the box usually require multiple folding tabs to connect two adjacent side panels when folding and fixing them, and then the folding tabs (which can be folded inward or outward) are fixed. The folding tabs can be fixed by inserting snap-fit ​​tabs into corresponding snap-fit ​​interfaces (using tongue-and-loop snap-fit). Many existing packaging boxes have complex side panel and folding tab designs when folded and fixed, requiring multiple folding steps. Furthermore, the operation of the snap-fit ​​tabs is not smooth when inserting them into the corresponding slots. For example, the tabs cannot be folded smoothly (requiring pressure), easily causing bending and deformation. Directly inserting the snap-fit ​​tabs into the slots can easily cause them to break through, and the inward insertion can tear or damage the fit between the snap-fit ​​tab and the slot. For disposable boxes, if the snap-fit ​​tabs cannot be securely fastened after insertion, it will affect the normal use of the box. Therefore, this easily leads to defective products during packaging operations, and the overall folding efficiency of the packaging box is low, affecting packaging efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a glue-free interlocking cardboard box, which has a simple structure, is easy and quick to fold and package, and can ensure packaging quality.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A glue-free interlocking cardboard box includes a square base plate and four side plates connected to the base plate by fold lines. The four side plates include two opposing first side plates and two opposing second side plates. The base plate, the two first side plates, and the two second side plates form a cavity. First folds are connected to the two sides of the first side plates along fold lines towards the adjacent second side plates. Second folds are connected to the two sides of the second side plates along fold lines towards the adjacent first side plates. The first and second folds are connected by a bifold line, and the second fold, after being folded along the bifold line, covers the outside of the first fold. The second fold piece is located outside the side panel after being folded along the fold line when the adjacent first and second side panels are folded upright relative to the bottom plate. A snap-fit ​​piece extends from the area outside the fold line of the second fold piece. The first side panel is provided with two snap-fit ​​interfaces for the snap-fit ​​piece to be inserted and snapped in. The snap-fit ​​piece is inserted into the snap-fit ​​interface for positioning after the second fold piece is bent toward the first side panel. The top edge of the second fold piece is flush with the top edge of the second side panel. In the second fold piece, a pressing fold line is formed by extending toward the top edge of the second fold piece from the outside of the fold line. The snap-fit ​​piece is located on the top edge of the second fold piece and outside the pressing fold line.

[0007] Furthermore, the outer endpoint of the fold line continues to extend outward to form an outer extension line, and the outer extension line extends towards the top edge of the second fold to form a pressing fold line.

[0008] Furthermore, the fold line is formed by extending from the outer end of the fold line towards the top edge of the second fold.

[0009] Furthermore, the snap-fit ​​piece is a tongue that can be bent and connected to the second fold piece. The tongue has wing-shaped ear pieces on both sides of the connection end. After being guided by the pressure fold line, the second fold piece drives the ear piece on the side of the snap-fit ​​piece closest to the pressure fold line to snap into the snap-fit ​​interface for positioning.

[0010] Furthermore, the end of the card interface closest to both sides of the first side plate is the first end. The side of the first side plate is located inside the first end, the fold line is located inside the fold line, and the card ear is located outside the fold line. When the card contact piece is inserted into the card interface, the fold line is located inside the first end of the card interface, and the card ear on the side of the card contact piece closest to the fold line is inserted into the first end of the card interface first.

[0011] Furthermore, the first fold forms a triangle, and the second fold forms a trapezoid or triangle. The second fold is bent towards the first side panel and then attached to the outside of the first side panel, with the first fold located between the first side panel and the second fold.

[0012] Furthermore, the second fold is divided into an inner part and an outer part along the fold line. The fold line is located in the inner part, which forms a trapezoid and covers the first fold. The snap-fit ​​piece is located at the top of the outer part.

[0013] Furthermore, the inner ends of the first and second side plates are connected to the bottom plate by fold lines, and the outer ends of the first and second side plates are respectively connected to the top plate by fold lines.

[0014] Furthermore, the snap-fit ​​piece is a tongue that can be bent and connected to the second fold piece. The tongue forms wing-shaped latches on both sides of the connection end. The snap-fit ​​interface is located on the fold line between the first side plate and the top plate. Both sides of the snap-fit ​​interface extend into the first and second top plates to form a wire opening.

[0015] Furthermore, the outer ends of the two first side plates are respectively connected by fold lines to a first top plate and a second top plate. A hook is protruding on the first top plate, and an insertion slot is provided on the second top plate. When the cardboard box is folded into shape, the hook is inserted into the insertion slot and limited when the second top plate covers the first top plate.

[0016] Furthermore, the outer ends of the two second side panels are respectively connected to a third top plate by fold lines. The third top plate is located at the bottom of the first and second top plates when the cardboard box is folded and formed.

[0017] With the above structure, the cardboard box of this utility model has the following advantages:

[0018] 1. The cardboard boxes can be stacked directly before folding, making them easy to store, preserve, and transport;

[0019] 2. The cardboard box can be folded and formed without glue, the overall structure is simple, and the packaging process is simplified. The operation is continuous, which greatly improves packaging efficiency.

[0020] 3. A pressure crease has been added to the second fold, which can form a certain directional force to guide and buffer the action. When the snap-fit ​​is engaged, it first snaps into one end before completing the engagement, avoiding breaking the snap-fit ​​interface. The second fold is not easily deformed, and the snap-fit ​​operation is quick, efficient and not easily broken. The operator can smoothly and quickly insert the snap-fit ​​into the snap-fit ​​interface for positioning. The operation can be completed in one go, which improves packaging efficiency and ensures packaging quality. Attached Figure Description

[0021] Figure 1 This is a plan view of the present invention.

[0022] Figure 2 This is a three-dimensional schematic diagram of the present invention after folding and forming;

[0023] Figure 3 This is a three-dimensional schematic diagram of the present invention after folding and forming (each top plate is open);

[0024] Figure 4 This is a schematic diagram of the folding and forming process of this utility model (a schematic diagram of the first inner fold piece and the second inner fold piece being inserted and positioned into the first side plate after being folded together). Detailed Implementation

[0025] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0026] Combination Figures 1 to 4 As shown, this utility model discloses a glue-free interlocking cardboard box. The cardboard box includes a square base plate 1 and four side plates connected to the base plate by fold lines. The four side plates include two first side plates 2 and two second side plates 3 arranged opposite each other. The base plate 1, the two first side plates 2, and the two second side plates 3 can be fixed together to form a cavity. Adjacent first side plates 2 and second side plates 3 can be connected and positioned by folding tabs. The two sides of the first side plate 2 are connected to the adjacent second side plate 3 by fold lines, and the two sides of the second side plate 3 are connected to the adjacent first side plate 2 by fold lines. The first folding tab 41 and the second folding tab 42 are connected by fold lines 43. After the second folding tab 42 is folded along the fold line 43, it can cover the outside of the first folding tab 41. The second folding tab 42 also extends a snap-fit ​​tab 44 in the area outside the fold line 43. The first side plate 2 is provided with two snap-fit ​​interfaces 21 for the snap-fit ​​tab 44 to be inserted and snapped in.

[0027] Combination Figure 2 , Figure 4 As shown, when the cardboard box is folded into shape, the first fold piece 41 and the second fold piece 42 are folded along the fold line 43 when the adjacent first side plate 2 and second side plate 3 are folded upright relative to the bottom plate 1, and are located on the outside of the side plate (refer to...). Figure 4 At this time, the first fold 41 and the second fold 42 are folded out on the outside of each side panel, and the snap-fit ​​piece 44 can be inserted into the snap-fit ​​interface 21 after the second fold 42 is bent towards the first side panel 2 for positioning. The four corners of the box can be inserted and positioned after the first fold 41 and the second fold 42 are folded in half, so that the adjacent two side panels can be quickly folded and formed without the need for glue.

[0028] Furthermore, during the folding and shaping of the cardboard box, after each side panel is folded upright, to ensure smoother insertion and positioning of the snap-fit ​​tab 44 during the insertion and positioning process of the first and second folded pieces, and to avoid jamming during insertion and deformation or tearing damage during bending of the folded pieces, in this invention, the top edge of the second folded piece 42 is flush with the top edge of the second side panel 3. In the second folded piece, a folding line 45 extends from the outer side of the fold line 43 towards the top edge of the second folded piece 42. The folding line 45 forms a crease line perpendicular to the point where force is applied to the inner side of the snap-fit ​​tab 44. The snap-fit ​​tab 45 is located on the top edge of the second folded piece 42 and outside the folding line. In this embodiment, the folding line 45 extends from the outer end of the fold line 43 towards the top edge of the second folded piece 42, and the snap-fit ​​tab 44 is located on the top edge of the second folded piece and outside the folding line 45.

[0029] like Figure 4 As shown, after folding the first flap 41 and the second flap 42 together, the first flap 41 is located inside the second flap 42. When the snap-fit ​​piece 44 is pressed into the snap-fit ​​interface 21, the second flap is not easily deformed due to the directional force guidance and buffering effect of the fold line 45, which enhances its resistance to compression deformation. During operation, the fingers can push the second flap 42 inward and press the snap-fit ​​piece 44, which can be guided into the snap-fit ​​interface 21. This allows the operator to smoothly and quickly insert the snap-fit ​​piece 44 into the snap-fit ​​interface 21 for positioning, completing the positioning and shaping action after folding, improving assembly smoothness, increasing packaging efficiency, and ensuring packaging quality.

[0030] In the second fold 42, an outer extension line 421 can be formed by extending outward from the outer end of the fold line 43. The outer extension line 421 forms the side of the second fold 42 outside the fold line 43. A pressing fold line 45 can be formed by extending along the outer extension line 421 towards the top edge of the second fold 42. In this embodiment, the first fold 41 forms a triangle, and the second fold 42 can form a trapezoid or a triangle. In this embodiment, the second fold 42 forms a trapezoid. After the second fold 42 is bent towards the first side plate 2, it adheres to the outside of the first side plate 2. At this time, the first fold 41 is located between the first side plate 2 and the second fold 42. In this embodiment, one end of the pressing fold line 45 is located at the outer end of the fold line 43. The second fold 42 can be divided into an inner part A and an outer part B along the pressing fold line 45. The fold line 43 is located at the bottom of the inner part A. The inner part A can form a trapezoid and cover the first fold 41. The snap-fit ​​piece 44 can be located at the top of the outer part B.

[0031] The cardboard box may also have a top cover to close the opening of the box cavity. The inner ends of the first side plate 2 and the second side plate 3 are connected to the bottom plate by fold lines, and the outer ends of the first side plate 2 and the second side plate 3 are respectively connected to the top plate by fold lines. In this embodiment, the outer ends of the two first side plates 1 are respectively connected to the first top plate 51 and the second top plate 52 by fold lines. A hook 53 is protruding on the outer side of the first top plate 51, and an insertion slot 521 is provided on the second top plate 52. The insertion slot 521 can be formed directly by cutting an opening line. When the cardboard box is folded into shape, such as Figure 2 As shown, the latch 53 can be inserted into the socket 521 and limited when the second top plate 52 covers the first top plate 51. The latch 53 can be formed in the shape of an eagle hook or a wing, and the barb 531 formed at the end of the latch 53 is stopped in the socket 521.

[0032] A third top plate 54 can be connected to the outer ends of the two second side plates 3 by fold lines. When the cardboard box is folded and formed, the third top plate 54 is located at the bottom of the first top plate 51 and the second top plate 52, further sealing the upper opening of the box. Of course, it is also possible to connect the first top plate 51 and the second top plate 52 to the outer ends of the second side plates 3, and connect the third top plate 54 to the outer ends of the first side plates 2, depending on the shape of the cardboard box.

[0033] In this embodiment, the snap-fit ​​piece 44 is a tongue that can be bent and connected to the second fold piece. The tongue has wing-shaped latches 441 on both sides of the connecting end. The snap-fit ​​interface 21 can be located on the fold line between the first side plate 2 and the top plate. In this embodiment, it is located on the fold line between the first side plate 2 and the first top plate 51 or the second top plate 52. The two sides of the snap-fit ​​interface 21 can extend into the first top plate 51 and the second top plate 52 to form a cutout 211, so that when the latches 441 are snapped into the snap-fit ​​interface 21, a buffer is formed to prevent breakage.

[0034] When the card connector 44 is inserted into the card interface 21 and positioned, the second fold 42 can be guided by the fold line 45 to drive the ear 441 on the side of the card connector 44 near the fold line 45 to be inserted into the card interface 21 for positioning. The end of the card interface 21 near the two sides of the first side plate 2 is defined as the first end 21a. The side of the first side plate is located inside the first end 21a. The fold line 43 is located inside the fold line 45, and the ear 441 is located outside the fold line 45. When the card connector 44 is inserted into the card interface 21, the fold line 45 is located inside the first end 21a of the card interface, and the ear 441 on the side of the card connector 44 near the fold line 45 can be inserted into the first end 21a of the card interface 21 first.

[0035] Furthermore, the cardboard box of this utility model is also made of cardboard in one piece, that is, the bottom plate 1, the two first side plates 2, the two second side plates 3, the first top plate 51, the second top plate 52, the third top plate 54, and the first folding piece 41 and the second folding piece 42 form a single piece of cardboard. The cardboard can be directly stacked before the box is folded, which is convenient for storage and transportation.

[0036] When the packaging box of this utility model is folded and formed, in the flat cardboard, the two first side panels 2 and the two second side panels 3 are folded up against the bottom plate 1 in sequence to form an enclosed cavity. Then, at both ends of the first side panel 2, the first fold piece 41 and the second fold piece 42 are folded along the fold line 43 and located on the outside of the side panel when the adjacent first side panels 2 and second side panels 3 are folded up against the bottom plate 1. Then, the outer part B of the second fold piece 42 can be pinched with two fingers and folded outward along the pressing fold line 45 (e.g., Figure 4(In the direction of arrow a1); then bend the second fold 42 together with the first fold 41 toward the first side plate 2. At this time, both hands can be used at the same time. One hand presses the inside of the second fold A, and the fingers of the other hand pinch the snap-fit ​​piece 44, causing the snap-fit ​​piece 44 to snap into the snap-fit ​​ear 441 near the end of the fold line 45, which is first inserted into the first end 21a of the snap-fit ​​interface 21 (as shown by the arrow a1 in the middle). Figure 4 In the direction of arrow a2, the second fold 42, after being folded, can better guide the snap-fit ​​piece 44 to insert into the first end 21a. Then, the other end of the snap-fit ​​piece 44 can be fully inserted into the card slot 21 to complete the engagement. This completes the positioning of the snap-fit ​​pieces 44 on the second fold 42 into their corresponding card slots 21, thus completing the folding and insertion positioning at one corner of the box. This insertion method avoids the snap-fit ​​piece 44 breaking through the card slot 21 and prevents tearing damage to the fit between the snap-fit ​​piece 44 and the card slot 21 during direct insertion. For disposable boxes, this greatly ensures packaging efficiency and packaging yield. Finally, following the same method, the four corners of the box can be positioned after folding the first fold 41 and the second fold 42, allowing adjacent side panels to be quickly folded without the need for adhesive. After folding each side panel, the contents can be placed into the inner cavity of the box, and finally, the top cover can be closed. Therefore, the folding and forming of cardboard boxes allows for continuous operation by the operator, which simplifies packaging processes, greatly improves packaging efficiency, and ensures quality while preventing defective products.

[0037] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A glueless snap-lock carton, the carton comprising a square base panel and four side panels hingedly connected to the base panel, the four side panels comprising two first side panels disposed opposite each other and two second side panels disposed opposite each other, the base panel, the two first side panels and the two second side panels enclosing a chamber therebetween, characterised in that: The first side panel has two fold lines connecting its two sides to the adjacent second side panel, and the second side panel has two fold lines connecting its two sides to the adjacent first side panel. The first and second folds are connected by a fold line, and the second fold covers the outside of the first fold after being folded along the fold line. When the adjacent first and second side panels are folded upright relative to the bottom plate, the first and second folds are located on the outside of the side panels after being folded along the fold line. A snap-fit ​​piece extends from the area outside the fold line of the second fold. The first side panel has two corresponding snap-fit ​​interfaces for the snap-fit ​​piece to be inserted and snapped in. The snap-fit ​​piece is inserted into the snap-fit ​​interfaces after the second fold is bent toward the first side panel and positioned. The top edge of the second fold is flush with the top edge of the second side panel. In the second fold, a pressing fold line extends from the outside of the fold line toward the top edge of the second fold. The snap-fit ​​piece is located on the top edge of the second fold and outside the pressing fold line.

2. A glueless snap-lock carton as claimed in claim 1, wherein: The outer end of the fold line continues to extend outward to form an outer extension line, and the outer extension line extends towards the top edge of the second fold to form a pressing fold line.

3. A glueless snap-lock carton as claimed in claim 1 wherein: The fold line is formed by extending from the outer end of the fold line towards the top edge of the second fold.

4. A glue-free interlocking cardboard box as described in any one of claims 1 to 3, characterized in that: The snap-fit ​​piece is a tongue that can be bent and connected to the second fold piece. The tongue has wing-shaped ear-shaped clips on both sides of the connection end. After being guided by the pressure fold line, the second fold piece drives the ear-shaped clip on the side of the snap-fit ​​piece closest to the pressure fold line to snap into the snap-fit ​​interface for positioning.

5. A glue-free interlocking cardboard box as described in claim 4, characterized in that: The end of the card interface closest to both sides of the first side plate is the first end. The side of the first side plate is located inside the first end. The fold line is located inside the fold line. The card ear is located outside the fold line. When the card contact piece is inserted into the card interface, the fold line is located inside the first end of the card interface. The card ear on the side of the card contact piece closest to the fold line is inserted into the first end of the card interface first.

6. A glue-free interlocking cardboard box as described in claim 2 or 3, characterized in that: The first fold forms a triangle, and the second fold forms a trapezoid or triangle. The second fold is bent toward the first side panel and then attached to the outside of the first side panel, with the first fold located between the first side panel and the second fold.

7. A glue-free interlocking cardboard box as described in claim 3, characterized in that: The second fold is divided into an inner part and an outer part along the fold line. The fold line is located in the inner part, which forms a trapezoid and covers the first fold. The snap-fit ​​piece is located at the top of the outer part.

8. A glue-free interlocking cardboard box as described in claim 1, characterized in that: The inner ends of the first and second side plates are connected to the bottom plate by fold lines, and the outer ends of the first and second side plates are respectively connected to the top plate by fold lines; the card interface is located on the fold line between the first side plate and the top plate, and the two sides of the card interface extend into the first and second top plates to form all openings.

9. A glue-free interlocking cardboard box as described in claim 8, characterized in that: The outer ends of the two first side plates are respectively connected by fold lines to the first top plate and the second top plate. The first top plate has a protruding hook, and the second top plate has an insertion slot. When the cardboard box is folded into shape, the hook is inserted into the insertion slot and limited when the second top plate covers the first top plate.

10. A glue-free interlocking cardboard box as described in claim 9, characterized in that: The outer ends of the two second side panels are respectively connected to the third top panel by fold lines. The third top panel is located at the bottom of the first and second top panels when the cardboard box is folded and formed.

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