Packaging box assembly and packaging set

By designing a detachable packaging box assembly, a multi-functional conversion from storage to gaming is achieved, solving the problem that the packaging box cannot be used again, and improving user experience and environmental protection.

CN223291481UActive Publication Date: 2025-09-02SHENZHEN HELLO TECH ENERGY CO LTD
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Patent Information

Application Number
CN202422836989.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-20
Publication Date
2025-09-02
Estimated Expiration
2034-11-20

AI Technical Summary

Technical Problem

Existing packaging boxes are usually discarded as domestic waste after use, and fail to achieve secondary use, which is not conducive to environmental protection.

Method used

A detachable packaging box assembly is designed, with storage and gaming state. The box can be detached to form a hollow structure for use in a hut or pet activity box. The inner support can be detached into an interactive toy. The box can be pieced together into a pet park.

Benefits of technology

The secondary use of packaging boxes is realized, improving user experience and fun, and promoting environmental protection.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of packaging, and discloses a packaging box assembly and a packaging suite, the packaging box assembly comprises a box body and a cover body which are enclosed by a plurality of paperboards, an accommodating cavity is arranged in the box body, and a plurality of detachable parts are arranged on the box body; in the storage state, the cover body is buckled on the box body to seal the accommodating cavity; in a game state, the detachable part is separated from the box body, so that a plurality of hollow parts are formed on the outer wall of the box body, the box body forms a cabin or a pet activity box, and the hollow parts form a door, window and hole form. The packaging box assembly has the storage state for containing products and the game state for games, interestingness is high, user experience is good, secondary use of the packaging box assembly is achieved, and environmental protection is facilitated.
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Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a packaging box assembly and a packaging set. Background Art

[0002] Energy storage power supplies are widely used in scenarios such as home emergencies, outdoor travel, and disaster prevention and preparedness.

[0003] In the prior art, energy storage power supplies are typically packaged in boxes, which protect the power supply and facilitate transportation. However, after the user removes the power supply from the box, the box is discarded as household waste and is typically not reused, which is not environmentally friendly.

[0004] Therefore, there is an urgent need for a packaging box assembly and a packaging set to solve the above technical problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a packaging box assembly and a packaging set, which has both a storage state for accommodating products and a gaming state for use in games, is highly interesting, provides a good user experience, and realizes the secondary use of the packaging box assembly, which is beneficial to environmental protection.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Provided is a packaging box assembly, comprising a box body and a cover body formed by enclosing a plurality of paperboards, wherein a receiving cavity is provided in the box body, and a plurality of detachable parts are provided on the top of the box body;

[0008] In the storage state, the cover is buckled onto the box to close the accommodating cavity;

[0009] In the game state, the detachable part is separated from the box body, so that the outer wall of the box body forms a plurality of hollow parts. The box body constitutes a small house or a pet activity box, and the hollow parts constitute doors, windows and holes.

[0010] Preferably, the cover body includes two oppositely arranged first folding covers and two oppositely arranged second folding covers; in the storage state, the two first folding covers are buckled on top of the two second folding covers; in the game state, the two first folding covers are tilted and placed on the two second folding covers to form a slanted top.

[0011] Preferably, the second folding cover is configured as an isosceles triangle or an isosceles trapezoidal structure. In a gaming state, the two first folding covers respectively rest against two oblique sides of the second folding cover.

[0012] Preferably, one end of the first folding cover is connected to an inserting plate, and the second folding cover is provided with a slot. In the storage state, the inserting plate is inserted into the slot to connect the first folding cover and the second folding cover to each other.

[0013] Preferably, the box body includes a bottom plate and four side plates respectively connected to the sides of the bottom plate;

[0014] The detachable portion is provided on at least part of the side panels; or

[0015] The detachable portion is provided on the bottom plate and at least a portion of the side plate.

[0016] Preferably, the lower ends of the side panels are rotatably connected to the sides of the bottom panel, and the packaging box assembly also has an unfolded state;

[0017] In the unfolded state, the side panels are separated from each other and are flatly unfolded relative to the bottom panel.

[0018] Preferably, the packaging box assembly further comprises an inner tray. In the storage state, the inner tray is arranged in the accommodating cavity for cushioning the vertical impact suffered by the contained goods. A plurality of modeling cards are provided on the inner tray. In the game state, the modeling cards are detached from the inner tray to form a plurality of interactive toys.

[0019] Preferably, the inner support includes a base plate made of cardboard, the base plate has at least two tear lines, the tear lines separate the base plate into at least two modeling cards, the modeling cards have a snap-fitting portion, and the two modeling cards can be snap-fitted together through the snap-fitting portion to assemble into the interactive toy.

[0020] Preferably, the shape of the hollow portion is at least one of a star shape, a window pane shape, a petal shape, a pet paw shape and a pet face shape.

[0021] A packaging set is also provided, comprising at least two packaging box assemblies as described above. In the game state, at least two of the packaging box assemblies can be assembled to form a pet park, and the hollow portions on the adjacent surfaces of two adjacent boxes are connected.

[0022] Beneficial effects of the utility model:

[0023] The packaging box assembly provided by the present invention has a storage state and a game state: in the storage state, the cover body can close the accommodating cavity, and at this time the box body can be used as a storage box to package and store the product, thereby protecting the product and facilitating the transportation of the product; when the product is taken out of the box body, the packaging box assembly can be switched to the game state, and the detachable part is separated from the outer wall of the box body to form a hollow part to constitute a door, window, and hole structure for children or pets to play, making the packaging box assembly more interesting, providing a better user experience, and realizing the secondary use of the packaging box assembly, which is beneficial to environmental protection.

[0024] The packaging set provided by the present invention includes at least two packaging box assemblies. In the game state, at least two packaging box assemblies are assembled to form a larger and more complex pet park structure. Adjacent boxes are connected to each other through hollow parts for pets to pass through, thereby realizing the reuse of the packaging box assemblies and further improving the fun. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the packaging box assembly provided by the present invention in a storage state;

[0026] Figure 2 This is a diagram of the packaging box assembly provided by the present invention in a gaming state. Figure 1 ;

[0027] Figure 3 This is a diagram of the packaging box assembly provided by the present invention in a gaming state. Figure 2 ;

[0028] Figure 4 This is a schematic structural diagram of various hollow portions on the first side panel provided by the present invention;

[0029] Figure 5 This is a schematic structural diagram of various hollow portions on the second side panel provided by the present invention;

[0030] Figure 6 This is a schematic diagram of the state of the box provided by the utility model when it is in the spread state Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the state of the box provided by the utility model when it is in the spread state Figure 2 ;

[0032] Figure 8 This is a schematic structural diagram of the upper inner support and the lower inner support provided by the utility model;

[0033] Figure 9 This is a structural diagram of the interactive toy provided by the utility model;

[0034] Figure 10It is a structural schematic diagram of the packaging set provided by the utility model in a gaming state.

[0035] In the picture:

[0036] 10. Removable portion; 20. Hollow portion; 21. First hollow portion; 22. Second hollow portion; 23. Third hollow portion;

[0037] 100, box body; 110, bottom plate; 120, first side plate; 121, side inserting tongue; 130, second side plate; 131, inner folding portion; 132, side connecting groove;

[0038] 200, cover body; 210, first folding cover; 211, inserting plate; 212, top inserting tongue; 220, second folding cover; 221, bevel; 222, slot; 223, top slot;

[0039] 300, upper inner support; 310, modeling card; 400, lower inner support; 410, limit slot; 500, interactive toy. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0041] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] like Figures 1-10 As shown, this embodiment provides a packaging box assembly for accommodating and packaging goods. In this embodiment, the packaging box assembly is used to package an energy storage power supply, which is a cabinet-type structure and is placed vertically within the packaging box assembly. The packaging box assembly includes a box body 100 formed by a plurality of cardboard panels, a cover 200, and an inner support. The box body 100 has a cavity for accommodating the energy storage power supply. The inner support is located within the box body 100 to provide vertical cushioning for the energy storage power supply.

[0045] Further, such as Figures 1-10 As shown, the box body 100 has several detachable parts 10 on it, and the packaging box assembly has a storage state and a game state that can be switched between each other. In the storage state, the cover body 200 is buckled on the box body 100 to close the accommodating cavity. In the game state, the detachable part 10 is separated from the box body 100, so that the outer wall of the box body 100 forms several hollow parts 20. The box body 100 constitutes a small house or a pet activity box, and the hollow parts 20 constitute doors, windows, and holes.

[0046] Specifically, if Figures 1-10 As shown, the packaging box assembly provided in this embodiment has a storage state and a game state: in the storage state, the cover 200 can close the accommodating cavity. At this time, the box body 100 can be used as a storage box to package and store the product, thereby protecting the product and facilitating product transportation; when the product is taken out of the box body 100, the packaging box assembly can be switched to a game state, and the detachable part 10 is separated from the outer wall of the box body 100 to form a hollow part 20 to constitute a door, window, and hole structure for children or pets to play with, making the packaging box assembly more interesting, the user experience better, and realizing the secondary use of the packaging box assembly, which is beneficial to environmental protection.

[0047] In this embodiment, if Figure 2 As shown, the box 100 forms a small house for children to play in the play state. Specifically, the cover 200 includes two first folding covers 210 and two second folding covers 220 arranged opposite to each other. In the storage state, the two first folding covers 210 are buckled on top of the two second folding covers 220. In the play state, the two first folding covers 210 are tilted and placed on the two second folding covers 220 to form a sloping roof, making the shape of the box 100 similar to a sloping roof house, thereby increasing the fun. Of course, as Figure 3 As shown, the box 100 can also constitute a pet activity box in the game state. The first folding cover 210 and the second folding cover 220 do not need to form a sloping roof structure. The box 100 is used horizontally, and hollow parts 20 for pets to pass through are opened on at least two outer walls of the box 100.

[0048] For example, Figure 6 and Figure 7 As shown, the second folding cover 220 is set to an isosceles triangle or an isosceles trapezoidal structure. In the game state, the two first folding covers 210 are respectively against the two oblique sides 221 of the second folding cover 220, and the oblique sides 221 are set at an angle to the horizontal plane. Therefore, the first folding covers 210 against the oblique sides 221 are also set at an angle to the horizontal plane. The two symmetrically inclined first folding covers 210 form an oblique top.

[0049] For example, Figure 6 and Figure 7 As shown, one end of the first flap 210 is connected to an insert plate 211, and the second flap 220 is provided with a slot 222. In the stowed state, the insert plate 211 is inserted into the slot 222, thereby connecting the first and second flaps 210 and 220. One end of the first flap 210 is rotatably connected to the case 100, and the insert plate 211 is rotatably mounted on the other end of the first flap 210. One end of the second flap 220 is rotatably connected to the case 100, and the slot 222 extends through the second flap 220 along a straight line perpendicular to the rotational direction. In the stowed state, the insert plate 211 and the slot 222 extend in the same direction. The insert plate 211 is inserted into the slot 222, connecting the first folding cover 210 and the second folding cover 220 to form a top cover that closes the upper opening of the box body 100. In this embodiment, the second folding cover 220 is configured as an isosceles trapezoidal structure. In the play state, the top edge is arranged horizontally, the insert plate 211 is disengaged from the slot 222, and the insert plate 211 abuts against the top of the second folding cover 220 to form the top of the sloping roof. Preferably, an upper insert tongue can be provided on the top edge, and a corresponding limiting hole is provided on the insert plate 211. The upper insert tongue is inserted into the limiting hole to improve the structural stability of the sloping roof structure.

[0050] For example, Figure 1 As shown, one end of the slot 222 passes through the top edge of the second folding cover 220, and the other end of the slot 222 penetrates the side wall of the box body 100 to form a limit end. In the storage state, the inserting plate 211 is inserted into and abuts against the limit end, and the limit end limits the insertion depth of the inserting plate 211, thereby keeping the first folding cover 210 in a horizontal position.

[0051] For example, Figure 1As shown, in the storage state, the two slots 222 extend along the same horizontal straight line, and each plug board 211 can be inserted into the two slots 222 at the same time. That is, the plug board 211 on each first folding cover 210 is inserted into the slots 222 on the two second folding covers 220 at the same time, so that each first folding cover 210 is connected to the two second folding covers 220 at the same time, thereby improving the connection reliability.

[0052] For example, Figure 6 and Figure 7 As shown, each second folding cover 220 is provided with a slot 222 , and the slot width of the slot 222 is equal to twice the thickness of the inserting plate 211 . In the storage state, the two inserting plates 211 are inserted into the same two slots 222 at the same time.

[0053] For example, Figure 6 and Figure 7 As shown, top insertion tongues 212 are provided on both sides of the first folding cover 210, and at least two top slots 223 are provided on the second folding cover 220. In the stowed state, the top insertion tongues 212 on both sides of the first folding cover 210 are respectively inserted into the top slots 223 of the two second folding covers 220, thereby connecting the first folding cover 210 with the two second folding covers 220, thereby strengthening the connection strength between the first folding cover 210 and the second folding cover 220.

[0054] For example, Figure 4-Figure 7 As shown, the box 100 includes a bottom panel 110 and four side panels connected to the sides of the bottom panel 110. Removable portions 10 are provided on at least some of the side panels, or on the bottom panel 110 and at least some of the side panels. Specifically, when the box 100 is a small room in the gaming state, the removable portions 10 are provided on at least some of the side panels, and the hollow portions 20 serve as the doors and windows of the small room. When the box 100 is a pet activity box in the gaming state, the removable portions 10 are provided on the bottom panel 110 and at least some of the side panels, and the hollow portions 20 serve as holes in the pet activity box for the pet to pass through.

[0055] For example, Figure 4-Figure 7As shown, the four side panels include two first side panels 120 and two second side panels 130. The two first side panels 120 are respectively connected to two opposite side edges of the bottom panel 110, and the two second side panels 130 are respectively connected to the other two opposite side edges of the bottom panel 110. The first side panel 120 is provided with a first hollow portion 21. In the play mode, the first hollow portion 21 can serve as a window of the cabin or an observation window of the pet activity box. The second side panel 130 is provided with a second hollow portion 22 and a third hollow portion 23. The second hollow portion 22 is larger than the third hollow portion 23, and the bottom end of the second hollow portion 22 is connected to the bottom panel 110 or close to the floor. In the play mode, the second hollow portion 22 can serve as the door of the cabin or a passageway of the pet activity box, and the third hollow portion 23 can serve as another window of the cabin or another observation window of the pet activity box. When the box body 100 is used as a pet activity box in the gaming state, a fourth hollow portion 20 is provided on the bottom plate 110 , and the fourth hollow portion 20 can be used as a passage hole of the pet activity box.

[0056] For example, Figure 4-Figure 7 As shown, the shape of the hollow portion 20 is at least one of a star, a window pane, a petal, a pet's paw, and a pet's face. For example, the shapes of the first hollow portion 21 and the third hollow portion 23 can be selected to be star-shaped, a window pane, a pet's paw, and the shapes of the second hollow portion 22 and the fourth hollow portion 20 can be selected to be arch-shaped or a pet's face such as a cat, dog, or pig.

[0057] For example, Figure 6 and Figure 7 As shown, the lower end of the side panel is rotated to connect to the side of the bottom panel 110, and the packaging box assembly also has an extended state; in the extended state, the multiple side panels are separated from each other, and the multiple side panels are flatly spread out relative to the bottom panel 110. Specifically, when it is necessary to put in or take out the energy storage power supply, the packaging box assembly is switched to the extended state, the plug-in board 211 is disengaged from the slot 222, and the multiple side panels are separated accordingly. The multiple side panels can be flatly spread out in a petal-like manner relative to the bottom panel 110, and the user can directly move the energy storage power supply in or out without lifting the energy storage power supply to a position higher than the height of the side panel. This reduces the lifting height when taking and placing the energy storage power supply, reduces the difficulty of transportation, and can adapt to higher-frequency transportation needs. At the same time, it optimizes the user's unpacking experience. The petal-like unpacking method not only effectively solves the transportation problem, but also greatly enhances the user's sense of surprise and usage experience.

[0058] For example, Figure 6 and Figure 7As shown, one of the two adjacent side panels has an inwardly bendable inner folding portion 131 on its side edge, and a side connection groove 132 on the inner folding portion 131. The other side panel has an inwardly bendable side plug-in tongue 121 on its side edge. In the stowed state, the side plug-in tongue 121 is inserted into the side connection groove 132 to connect the two adjacent side panels, thereby increasing the connection strength between the two adjacent side panels. Specifically, the left and right sides of the first side panel 120 are each provided with a side plug-in tongue 121, and the left and right sides of the second side panel 130 are each provided with an inward folding portion 131. In the stowed state and the play state, the left and right sides of the first side panel 120 are respectively inserted into the side connection grooves 132 on the two inward folding portions 131 via the side plug-in tongue 121, thereby achieving a stable connection between the first side panel 120 and the second side panel 130.

[0059] In this embodiment, if Figure 6 and Figure 7 As shown, two side tongues 121 are provided on each side of the first side panel 120, and the two side tongues 121 are spaced apart in a direction away from the bottom panel 110. Correspondingly, two side connecting grooves 132 are provided on each inner fold portion 131, and the two side connecting grooves 132 are spaced apart in a direction away from the bottom panel 110.

[0060] Illustratively, the box body 100 is an integrally formed structure, and is made of corrugated cardboard, which is cut and folded to form the bottom plate 110, the side plates and the various connection structures mentioned above. The processing and assembly are simple, and the production cost is low.

[0061] For example, Figure 8 As shown, the inner support includes an upper inner support 300 and a lower inner support 400. In the stored state, the upper inner support 300 is located at the top of the energy storage power supply, and the lower inner support 400 is located at the bottom of the energy storage power supply. The upper inner support 300 and the lower inner support 400 cooperate with each other to buffer vertical impacts from both ends.

[0062] For example, Figure 8 and Figure 9 As shown, a plurality of modeling cards 310 are provided on the upper inner support 300. In the game state, the modeling cards 310 are detached from the inner support to form a plurality of interactive toys 500, such as furniture toys, which can be used by users for games to increase the fun.

[0063] For example, Figure 8 and Figure 9 As shown, the upper inner support 300 includes a cardboard substrate having at least two tear lines that separate the substrate into at least two shaped cards 310. The shaped cards 310 have a snap-fitting portion, and two shaped cards 310 can be snap-fitted together to form the interactive toy 500. The snap-fitting portion can be a snap-fitting notch or a snap-fitting protrusion. The two snap-fitting notches can snap together, and the snap-fitting notch and the snap-fitting protrusion can also snap together.

[0064] For example, Figure 8 As shown, the lower inner support 400 can support the energy storage power supply to prevent the energy storage power supply from directly contacting the ground. A limiting groove 410 is provided on the lower inner support 400. The shape of the limiting groove 410 is adapted to the bottom shape of the energy storage power supply. The lower inner support 400 can limit the horizontal position of the energy storage power supply with the bottom embedded in the limiting groove 410.

[0065] For example, the lower inner support 400 and / or the upper inner support 300 are made of honeycomb paperboard, which has an outstanding cushioning effect and is completely degradable. Compared with the cushioning structure using foam material, it is more environmentally friendly.

[0066] For example, Figure 10 As shown, this embodiment also provides a packaging set, which includes at least a packaging box assembly. In the game state, at least two packaging box assemblies can be assembled to form a pet park. The hollow parts 20 on the adjacent surfaces of two adjacent boxes 100 are connected to allow pets to pass through, further improving the fun and enhancing the user's intention to repurchase the product.

[0067] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A packaging box assembly, characterized in that: It comprises a box body and a cover body formed by enclosing a plurality of cardboards, wherein a receiving cavity is provided in the box body and a plurality of detachable parts are provided on the top of the box body; In the storage state, the cover is buckled onto the box to close the accommodating cavity; In the game state, the detachable part is separated from the box body, so that the outer wall of the box body forms a plurality of hollow parts. The box body constitutes a small house or a pet activity box, and the hollow parts constitute doors, windows and holes.

2. The packaging box assembly according to claim 1, characterized in that: The cover body includes two oppositely arranged first folding covers and two oppositely arranged second folding covers; in the storage state, the two first folding covers are buckled on top of the two second folding covers; in the game state, the two first folding covers are tilted and placed on the two second folding covers to form a slanted top.

3. The packaging box assembly according to claim 2, characterized in that: The second folding cover is configured as an isosceles triangle or an isosceles trapezoid structure. In a gaming state, the two first folding covers respectively rest against two oblique sides of the second folding cover.

4. The packaging box assembly according to claim 2, characterized in that: One end of the first folding cover is connected to an inserting plate, and the second folding cover is provided with a slot. In the storage state, the inserting plate is inserted into the slot to connect the first folding cover and the second folding cover to each other.

5. The packaging box assembly according to claim 1, wherein: The box body includes a bottom plate and four side plates respectively connected to four sides of the bottom plate; The detachable portion is provided on at least part of the side panels; or The detachable portion is provided on the bottom plate and at least a portion of the side plate.

6. The packaging box assembly according to claim 5, characterized in that: The lower ends of the side panels are rotatably connected to the sides of the bottom panel, and the packaging box assembly also has an unfolded state; In the unfolded state, the side panels are separated from each other and are flatly unfolded relative to the bottom panel.

7. The packaging box assembly according to any one of claims 1 to 6, characterized in that: The packaging box assembly also includes an inner tray. In the storage state, the inner tray is arranged in the accommodating cavity to cushion the vertical impact of the contained goods. A plurality of modeling cards are provided on the inner tray. In the game state, the modeling cards are detached from the inner tray to form a plurality of interactive toys.

8. The packaging box assembly according to claim 7, characterized in that: The inner support includes a base plate made of cardboard, the base plate has at least two tear lines, the tear lines separate the base plate into at least two modeling cards, the modeling cards have a snapping part, and the two modeling cards can be snapped together by the snapping part to assemble into the interactive toy.

9. The packaging box assembly according to any one of claims 1 to 6, characterized in that: The shape of the hollow portion is at least one of a star shape, a window pane shape, a petal shape, a pet paw shape, and a pet face shape.

10. A packaging set, characterized in that: It comprises at least two packaging box assemblies according to any one of claims 1 to 9. In the game state, at least two of the packaging box assemblies can be assembled to form a pet park, and the hollow parts on the adjacent surfaces of two adjacent boxes are connected.