TWM449135U - Improved box bottom structure - Google Patents

Description

Improved structure at the bottom of the box

The present invention relates to a structure for improving the bottom of the box, and particularly relates to a structure for improving the bottom of the box which is structurally stable, non-deformable, and has anti-collision protection effect, and is effective for protecting the contents.

However, with the rise of global environmental awareness, various plastic packaging materials that cause environmental pollution have gradually disappeared. Most of the market uses reusable recycled cartons as packaging equipment for various items, especially cakes, cakes or The food gift box is packed in a beautifully used carton, but the traditional carton containing these cakes, cakes or foods, as shown in the first and second figures, is the habit of the traditional carton (1a). Knowing that the structural strength of the bottom (10a) of the box bottom is not good, the conventional wall surface (11a) around the bottom of the box (10a) is rather thin, and often accidentally colliding or crushing will cause the cake, cake or food in the box to be pressed.垮, the occurrence of collapse affects the appearance of the beautiful shape, and the conventional box bottom (10a) structure is not stable, and there is no buffer protection effect, so that it is easy to cause the bottom of the box when taking, transporting or stacking each other ( The conventional wall surface (11a) of 10a) is deformed in a slanted manner and is pressed inwardly, which not only cannot be closed and closed with the cover body, but also severely crushes various cakes, cakes or foods contained therein, and affects the original delicate and beautiful design appearance. Caused impossible Therefore, in order to protect the food inside the box, some manufacturers further add a plastic inner box at the bottom of the box to strengthen the bottom protection structure, which not only increases the packaging cost, but also causes permanent pollution to the environment; It is known from the above that these shortcomings not only cause problems in the packaging and transportation of various cakes, cakes or foods, but also cause great inconvenience and trouble to users. At the same time, they are also long-term defects that cannot be broken by this related industry; In view of this, how can we develop a box bottom that is structurally stable, not easily deformed, and has a cushioning effect, so that the various cakes, cakes or foods contained therein can be taken or taken. During the delivery process, even when stacked, it can be effectively protected. The purpose of the carton packaging is to protect the contents. It is the technology and subject that all users and related operators are eager to break through and develop.

In view of the above-mentioned traditional carton box bottom, the creator still has many problems and cannot break through. The creator has started research and active research and development and creation, in order to break through the limitations of existing technical functions. After years of professional experience and experience in this industry, I created the creation of this case.

The main purpose of the present invention is to provide a modified structure of the bottom of the box. The bottom of the box is cut by at least one of the shape line marks at the support plate extending from the inner wall surface, and the folding line is pressed downward. Forming a convex abutting piece, the apex piece is inserted into a buffer gap formed between each outer wall surface and the inner wall surface, thereby strengthening the structure of the buffer gap of each wall surface, not only can the bottom structure of the box be stable and not easily deformed. It has deeper anti-collision buffering effect and will not tilt inward, so as to effectively protect the best condition of the food or contents contained in the box, and improve the practicality and utilization value of the packaging carton.

The secondary purpose of the present invention is to provide a modified structure of the bottom of the box, wherein each outer wall surface and the inner wall surface of the bottom of the box are connected by a top surface, which not only can prevent the collision cushioning effect of each wall surface of the box bottom. It is not easy to be deformed, and it can greatly improve the pressure stacking of the whole package carton and improve the superiority of the carton.

In order to achieve the above object, the present invention provides a modified bottom structure, wherein the bottom of the box is folded into a three-dimensional state by an integrally formed cardboard, and a plurality of walls folded by the cardboard define an accommodating space, and the bottom of the box has a bottom plate. The outer sides of the bottom plate may be bent inwardly by a fold line in advance and adhered to the suitable section to form a bottom plate flange respectively; and the bottom plate flanges of the two outer sides of the bottom plate respectively extend left and right outer wall faces respectively , using left and right outside The fold line between each outer wall surface of the wall surface and the bottom plate flange is bent inwardly and upwardly, so that the left and right outer wall surfaces form an upright outer wall surface of a predetermined height, each of the outer wall surfaces being a top surface and the inner surface thereof The wall surfaces are connected to each other; the left and right sides of each of the top faces each have a fold line, and the left and right inner wall faces are respectively vertically bent by the fold lines of the left and right sides of the top face respectively. a buffer gap is formed between the inner wall surface and the left inner and outer wall surfaces, and a buffer gap is formed between the right inner and outer wall surfaces; wherein the upper and lower ends of the bottom plate respectively extend an upper and lower outer wall surface, wherein the upper and lower outer wall surfaces respectively Each of the outer wall surfaces of the lower outer wall surface and the bottom plate has a fold line, and the fold line is bent inwardly and upwardly, so that the upper and lower outer wall surfaces form an upright outer wall surface of a predetermined height, each of the outer wall surfaces A top surface is connected to the inner wall surface thereof; each of the upper and lower sides of each top surface has a fold line respectively, and the upper and lower inner wall surfaces are respectively bent by the fold lines of the upper and lower sides of the top surface That is, the erected inner wall a buffering gap is formed between the inner and outer wall surfaces, and a buffering gap is formed between the inner and outer wall surfaces; and each of the inner wall surfaces is connected with a supporting plate opposite to one side end of the top surface portion; Each support plate has a fold line between the inner wall surface and the inner wall surface thereof, and each inner wall surface is cut at least one 线 word line mark adjacent to the support plate, and the fold line is bent and pressed downward to form a convex shape. The top sheet is inserted into the top sheet; the top sheet is inserted into the buffer gap formed between the outer wall surface and the inner wall surface, and is pressed against the bottom plate at the same time as the support plate, and the protruding end of the top sheet is also abutted. The structure is formed on the inner side of the outer wall surface to strengthen the buffer gap of each wall surface. The present invention further provides a modified bottom structure, which is folded into a three-dimensional state by integrally formed cardboard and folded by cardboard. The plurality of walls define an accommodating space, and the bottom of the box has a bottom plate, and the outer sides of the bottom plate can be bent inwardly by a fold line in advance and adhered to the suitable section to form a bottom plate flange respectively; Floor flange Extending either right or left outer wall surfaces by the left fold line between the outer wall surface of the bottom plate of each outer wall surface of the right flange bent inward and upward to enabling the left and right outer walls The surface forms an upright outer wall surface of a predetermined height, wherein each of the outer wall surfaces is connected to a inner wall surface thereof by a top surface portion; and each of the left and right sides of each of the top surface portions has a fold line respectively, and the top surface thereof has its own left side, After the fold lines on the right side are respectively bent, the left and right inner wall surfaces are respectively upright and the inner wall surface is formed downward, and a buffer gap is formed between the left inner and outer wall surfaces, and a buffer is formed between the right inner and outer wall surfaces. a gap; wherein the upper and lower ends of the bottom plate respectively have an upper and lower outer wall surface, and each outer wall surface of the upper and lower outer wall surfaces has a fold line between the bottom plate and the bottom plate, and the fold line is bent upward and upward And erecting the upper and lower outer wall surfaces to form an upright outer wall surface of a predetermined height, wherein each of the outer wall surfaces is connected to the inner wall surface by a top surface portion; and the upper and lower sides of each of the top surface portions respectively have a fold line, After the fold lines of the upper and lower sides of the top surface are respectively bent, the upper and lower inner wall surfaces are respectively upright and the inner wall surface is formed downward, and a buffer gap is formed between the upper inner and outer wall surfaces, and the inner and outer surfaces are formed. a buffer room is also formed between the walls Each of the inner wall surfaces is respectively connected with a support plate at a side end of one of the top surface portions thereof; wherein: each of the support plates has a fold line between the inner wall surface and the inner wall surface thereof, and each inner wall surface is adjacent to the support thereof The plate is cut by at least one 线 word line mark, and the folding line is bent and folded downward to form a convex apex piece; the apex piece is inserted between the outer wall surface and the inner wall surface. Forming a buffer gap and pressing against the support plate at the same time against the bottom plate, and the protruding end of the abutting piece also abuts against the inner side of the outer wall surface thereof, thereby reinforcing the structure of the buffer gap of each wall surface; The top surface portion is maintained at a predetermined height from the bottom plate by a predetermined height of the inner and outer wall surfaces; wherein the fold lines on the left and right sides of the top surface portion have a predetermined separation distance; wherein the fold lines on the upper and lower sides of the top surface portion have a predetermined distance; wherein the left and right outer wall surfaces respectively have a first ear portion extending; the left and right outer wall surfaces respectively have a second ear portion extending at a lower end thereof; wherein the left and right inner wall surfaces respectively extend a third portion respectively Ear Left and right lower ends of the inner wall surface extends a fourth ear; ear portion of the first and the third lines were left ear and right sides bent and formed between the coating on the outer wall surface and inner wall surface In the buffer gap; wherein the second ear portion and the fourth ear portion are respectively bent to the left and right sides and are wrapped in a buffer gap formed between the lower outer wall surface and the lower inner wall surface, so that the bottom of the box is The wall faces are further engaged with each other; by the above-mentioned technical means, the bottom of the present invention is formed by inserting the abutting piece against the inner wall surface and abutting between the outer wall surface and the inner wall surface. In the buffer gap, not only can the structure of the buffer gap of each wall surface be strengthened, but also the bottom structure of the box can be stabilized and not easily deformed, and the effect of protecting the contents of the box can be achieved.

In order to enable the review board to further understand the structure, features and functions of the present work, the preferred embodiment is described in detail with reference to the drawings.

The following is a special structure of the present invention: Please refer to the third, fourth, fifth, sixth, and seventh figures. The third figure of the preferred embodiment of the present invention is the bottom of the box (1). Schematic diagram of the unfolded state of the internal structure, the bottom of the three-dimensional box (1) is defined by the cardboard integrally formed by the third figure in a three-dimensional state and defined by a plurality of walls folded by the cardboard to define an accommodating space (100). The space (100) can provide foods or other items such as various cakes, cakes, etc., and the bottom (1) of the box has a bottom plate (10), and the outer sides of the bottom plate (10) can be bent inward by the fold line (F1). Folding a suitable section and using the adhesive technology to closely fit the suitable section to form a bottom plate flange (101), respectively, thereby strengthening the strength of the bottom plate (10); wherein the bottom plate flanges (101) on both outer sides of the bottom plate (10) respectively The left outer wall surface (11) and the right outer wall surface (13) are extended to the inner side by a fold line (F2) between each outer wall surface of the left and right outer wall surfaces (11), (13) and the bottom plate flange (101). And bending upwards, so that the left and right outer wall surfaces (11), (13) form an upright outer wall surface of a predetermined height, and the left and right outer wall surfaces (11), (13) upper end points Extending a first ear portion (111), (131), and a second ear portion (112), (132) extending from the lower end (as shown in the third figure); wherein the left outer wall surface (11) has a left end end Top face (110) and left inner wall (12) connected, the right end of the right outer wall surface (13) is connected to the right inner wall surface (14) by the top surface portion (130); the left and right sides of each of the top surface portions (110), (130) are There are fold lines (F3) and (F4), respectively, and the fold line (F3) and the fold line (F4) have predetermined separation distances, by each of the top faces (110), (130) of their respective left and right sides. After the folding lines (F3) and (F4) are respectively bent, the left and right inner wall surfaces (12) and (14) are upright and the inner wall surface is downward, and between the left outer wall surface (11) and the left inner wall surface (12). A buffer gap (1100) is formed, and a buffer gap (1300) is also formed between the right outer wall surface (13) and the right inner wall surface (14) (as shown in the seventh and sixth figures); wherein, the left and right sides are The upper ends of the wall surfaces (12) and (14) respectively extend a third ear portion (121) and (141), and the lower ends respectively extend a fourth ear portion (122) and (142) (as shown in the third figure); The left inner wall surface (12) is connected with a left support plate (123) opposite to one side end of the top surface portion (110), and a fold line (F5) is formed between the left support plate (123) and the left inner wall surface (12), and The left inner wall surface (12) is cut at least adjacent to the left support plate (123) with at least one 线 line mark, and the folding line (F5) The bending and downward pressing action forms a convex abutting piece (20), and the abutting piece (20) is inserted between the left outer wall surface (11) and the left inner wall surface (12). The buffer gap (1100) is pressed against the bottom plate (10) at the same time as the left support plate (123), and the protruding end (21) of the top plate (20) also abuts against the left outer wall surface (11). On the inner side, the structure of the reinforced buffer gap (1100) is not inclined inward to achieve a cushioning effect wall, and the food or article contained in the accommodating space (100) of the bottom box (10) is surely protected; The right inner wall surface (14) is connected with a right support plate (143) opposite to one side end of the top surface portion (130), and a fold line (F5) is also disposed between the right inner support plate (143) and the right inner wall surface (14). And on the right inner wall surface (14) adjacent to the right support plate (143), at least one 线 word line mark is also cut, and the folding line (F5) is bent and pressed downward, and the embossed apex is also formed. (20) The apex sheet (20) is also inserted into a buffer gap formed between the right outer wall surface (13) and the right inner wall surface (14). (1300), and is pressed against the bottom plate (10) at the same time as the right support plate (143), and the protruding end (21) of the abutting piece (20) also abuts against the right outer wall surface (13) On the inner side, the structure of the reinforcing buffer gap (1300) is also achieved without tilting inward; the upper and lower ends of the creation bottom plate (10) respectively have an upper and lower outer wall surface (15), (17), Each of the outer wall surfaces (15) and (17) has a fold line (F6) between the outer wall surface and the bottom plate (10), and the fold line (F6) is bent inwardly and upwardly to make the upper, The lower outer wall surfaces (15) and (17) form an upright outer wall surface of a predetermined height, wherein the upper and lower outer wall surfaces (15), (17) and the lower side end are respectively a top surface portion (150), (170) Connected to the upper and lower inner wall surfaces (16) and (18), each of the top and bottom surfaces (150) and (170) has a fold line (F7) and (F8), a fold line (F7) and a fold line. (F8) The two also have a predetermined separation distance, and are respectively bent by the fold lines (F7) and (F8) of the upper and lower sides of each of the top faces (150) and (170), respectively, up and down The inner wall surfaces (16) and (18) are respectively an upright inner wall surface, and the upper outer wall surface (15) and the upper inner wall A buffer gap (1500) is formed between the faces (16), and a buffer gap (1700) is also formed between the lower outer wall surface (17) and the lower inner wall surface (18); the upper inner wall surface (16) is opposite to the top surface portion thereof One end of (150) is connected with an upper support plate (161), a fold line (F9) is formed between the upper support plate (161) and the upper inner wall surface (16), and the upper inner wall surface (16) is adjacent to the upper support plate. (163) cutting at least one inverted crease line mark, matching the folding line (F9) bending and downward pressing action, thereby forming a convex-shaped abutting piece (20), the apex piece (20) Inserted into the buffer gap (1500) formed between the upper outer wall surface (15) and the upper inner wall surface (16), and pressed against the upper support plate (161) against the bottom plate (10) at the same time, and The protruding end (21) of the top piece (20) also abuts against the inner side of the upper outer wall surface (15), so that the structure of the reinforcing buffer gap (1500) does not incline inward; wherein the lower inner wall surface (18) is opposite to One side of the top surface portion (170) is connected with a lower support plate (181), and between the lower support plate (181) and the lower inner wall surface (18) There is also a fold line (F9), and at least one 线 line mark is cut on the lower inner wall surface (18) adjacent to the lower support plate (181), and the folding line (F9) is bent and pressed inwardly, and is also formed. a protruding abutting piece (20), the apex piece (20) is also inserted into a buffer gap (1700) formed between the lower outer wall surface (17) and the lower inner wall surface (18), and the lower support plate (181) simultaneously pressing against the bottom plate (10), and the protruding end (21) of the abutting top piece (20) also abuts against the inner side of the upper outer wall surface (17), which can also strengthen the buffer gap (1700) The structure is not inclined inward; the first ear portions (111), (131) and the third ear portions (121) and (141) of the present invention are bent to the left and right sides, respectively, and are wrapped thereon. In the buffer gap (1500) formed between the outer wall surface (15) and the upper inner wall surface (16), the second ear portions (112), (132) and the fourth ear portions (122) and (142) are also respectively The left and right sides are bent and covered in a buffer gap (1700) formed between the lower outer wall surface (17) and the lower inner wall surface (18), so that the four walls of the bottom of the box (1) are further engaged with each other. Positioning, more stable and not easily deformed; each top face of this creation (110), (130), (150), (170) The bottom plate (10) is also maintained at a predetermined height by a predetermined height of its inner and outer wall surfaces.

According to the above-mentioned creation description, the novelty and progress of the creation structure are that at least one 线-shaped line mark is cut at the inner wall surface of the bottom of the box adjacent to the extending support plate, and the folding line is pressed downward. Forming a convex abutting piece, the apex piece is inserted into a buffer gap formed between each outer wall surface and the inner wall surface, and is pressed against the bottom plate simultaneously with the support plate, and the apex sheet is The protruding end also abuts against the inner side of each outer wall surface, and the structure of the buffer gap of each wall surface is strengthened to achieve an optimum state of being stable without tilting inward, and the food contained in the accommodation space of the bottom of the box is surely protected. Or the contents, improve the superiority and practicability of the carton.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of implementation of the present invention. Any other changes and modifications or equalities made by the same spirit and scope of the present invention. The rows are covered by the scope of the creative protection and the scope of patents.

This creation is based on the above characteristics and is a very outstanding and excellent design; it is not found in the publication or public use, and is suitable for the application requirements of the new patent, and is submitted in accordance with the law.

(1a)‧‧‧Traditional cartons

(10a) ‧‧‧Study box bottom

(11a) ‧ ‧ 知知墙

(1) ‧‧‧ bottom

(10) ‧‧‧floor

(100) ‧‧‧ accommodating space

(101)‧‧‧Bottom plate flange

(11) ‧ ‧ left outer wall

(110), (130), (150), (170) ‧ ‧ top face

(1100), (1300), (1500), (1700) ‧ ‧ buffer gap

(111), (131) ‧ ‧ first ear

(112), (132) ‧ ‧ second ear

(12)‧‧‧Left inner wall

(121), (141) ‧ ‧ third ear

(122), (142) ‧ ‧ fourth ear

(123)‧‧‧Left support plate

(13) ‧‧‧Right outer wall

(14) ‧‧‧Right inner wall

(143)‧‧‧Right support plate

(15) ‧‧‧Upper wall

(16) ‧‧‧Upper inner wall

(161) ‧‧‧Upper support plate

(17)‧‧‧ Lower outer wall

(18)‧‧‧Under the inner wall

(181)‧‧‧ Lower support plate

(20) ‧ ‧ 抵 top film

(21) ‧‧‧ protruding end

(3) ‧ ‧ cover

(F1~F9) ‧‧‧ fold line

The first picture is a schematic diagram of the recess of the traditional box bottom.

The second picture is a schematic view of the traditional box bottom recess.

The third figure is a schematic diagram showing the expanded state of the internal structure of the preferred embodiment of the present invention.

The fourth figure is a schematic diagram of the folded state of the preferred embodiment of the present invention.

Fig. 5 is a perspective view showing a preferred embodiment of the present invention and a cover body.

Figure 6 is a cross-sectional view (I) of a preferred embodiment of the present invention.

Figure 7 is a cross-sectional view (2) of a preferred embodiment of the present invention.

(1) ‧‧‧ bottom

(10) ‧‧‧floor

(100) ‧‧‧ accommodating space

(101)‧‧‧Bottom plate flange

(110), (130), (150), (170) ‧ ‧ top face

(11) ‧ ‧ left outer wall

(14) ‧‧‧Right inner wall

(143)‧‧‧Right support plate

(16) ‧‧‧Upper inner wall

(161) ‧‧‧Upper support plate

(17)‧‧‧ Lower outer wall

(20) ‧ ‧ 抵 top film

(3) ‧ ‧ cover

(F2), (F3), (F4), (F7), (F8) ‧ ‧ fold line

Claims (6)

A modified bottom structure, the bottom of the box is folded into a three-dimensional state by an integrally formed cardboard, and a plurality of walls folded by the cardboard defines an accommodating space, the bottom of the box has a bottom plate, and the outer sides of the bottom plate can be pre-folded by a fold line Inwardly bending a suitable section and pasting the appropriate section to form a bottom plate flange respectively; characterized in that: the bottom plate flanges on both outer sides of the bottom plate respectively have left and right outer wall faces, and each of the left and right outer wall faces is utilized The fold line between the outer wall surface and the bottom plate flange is bent inwardly and upwardly, so that the left and right outer wall surfaces form an upright outer wall surface of a predetermined height, and each of the outer wall surfaces is connected to the inner wall surface by a top surface portion The left and right sides of each of the top faces each have a fold line, and the left and right inner wall faces are respectively upright and the inner wall faces are respectively bent by the fold lines of the left and right sides of the top face respectively. And a buffer gap is formed between the left inner and outer wall surfaces, and a buffer gap is formed between the right inner and outer wall surfaces; wherein the upper and lower ends of the bottom plate respectively extend an upper and lower outer wall surface, and the upper and lower outer wall surfaces Every outside A fold line is formed between the surface and the bottom plate, and the upper and lower outer wall surfaces are formed into an upright outer wall surface of a predetermined height by bending the fold line inwardly and upwardly, and each of the outer wall surfaces is a top surface and a inner surface thereof The wall surfaces are connected; the upper and lower sides of each of the top surfaces respectively have fold lines, and the upper and lower sides are respectively bent by the fold lines of the upper and lower sides of the top surface, respectively The wall surface is an upright inner wall surface, and a buffer gap is formed between the upper inner and outer wall surfaces, and a buffer gap is formed between the lower inner and outer wall surfaces; each inner wall surface is opposite to one of the top surface portions thereof. Each of the side ends is respectively connected with a support plate; wherein each support plate has a fold line between the inner wall surface and the inner wall surface thereof, and each inner wall surface is cut with at least one 线 line mark adjacent to the support plate, and is bent with the fold line And pressing downward to form a convex abutting piece; the apex piece is inserted into a buffer gap formed between the outer wall surface and the inner wall surface, and is pressed against the bottom plate simultaneously with the supporting plate And the protruding end of the top sheet also abuts against the inner side of the outer wall surface, thereby reinforcing the structure of the buffer gap of each wall surface. A modified bottom structure, the bottom of the box is folded into a three-dimensional state by an integrally formed cardboard, and a plurality of walls folded by the cardboard defines an accommodating space, the bottom of the box has a bottom plate, and the outer sides of the bottom plate can be pre-folded by a fold line Inwardly bending a suitable section and pasting the appropriate section to form a bottom plate flange respectively; the bottom plate flanges on both outer sides of the bottom plate respectively have left and right outer wall faces, and each outer wall surface of the left and right outer wall faces is used The fold line between the bottom plate flanges is bent inwardly and upwardly, so that the left and right outer wall faces form an upright outer wall surface of a predetermined height, and each of the outer wall surfaces is connected to the inner wall surface by a top surface portion; The left and right sides of the top surface respectively have fold lines, and the left and right sides of the top face are respectively After the fold lines are respectively bent, the left and right inner wall surfaces are respectively formed into an upright inner wall surface, and a buffer gap is formed between the left inner and outer wall surfaces, and a buffer gap is formed between the right inner and outer wall surfaces; An upper and lower outer wall surface is respectively extended on the upper and lower ends of the bottom plate, and each outer wall surface of the upper and lower outer wall surfaces has a fold line between the bottom plate and the bottom plate, and the fold line is bent upwards and upwards to make the upper line The lower outer wall surface forms an upright outer wall surface of a predetermined height, and each of the outer wall surfaces is connected to the inner wall surface by a top surface portion; the upper and lower sides of each of the top surface portions respectively have a fold line, and the top surface thereof has its own After the fold lines on the upper and lower sides are respectively bent, the upper and lower inner wall surfaces are respectively upright and the inner wall surface is formed downward, and a buffer gap is formed between the upper inner and outer wall surfaces, and between the inner and outer wall surfaces is also Forming a buffer gap; each inner wall surface is opposite to a side end of one of the top surface portions thereof respectively connected with a support plate; wherein: each of the support plates and the inner wall surface thereof has a fold line, and each inner wall surface Upper adjacent to its support plate Cutting at least one 线 word line mark, matching the folding line bending and downward pressing action, thereby forming a convex abutting piece; the apex piece is inserted into a buffer formed between the outer wall surface and the inner wall surface The gap is pressed against the bottom plate at the same time as the support plate, and the protruding end of the top sheet also abuts against the inner side of the outer wall surface, thereby reinforcing the structure of the buffer gap of each wall surface. The improved bottom structure according to the first or second aspect of the patent application, wherein the top surface portion is formed by a predetermined height of the inner and outer wall surfaces. The bottom plate also maintains a predetermined height. The improved bottom structure according to the first or second aspect of the invention, wherein the fold lines on the left and right sides of the top surface have a predetermined distance. The improved bottom structure according to the first or second aspect of the invention, wherein the fold lines on the upper and lower sides of the top surface have a predetermined distance. The improved bottom structure according to the first or the second aspect of the invention, wherein the left and right outer wall surfaces respectively have a first ear portion extending; and the left and right outer wall surfaces respectively extend a second ear portion. Wherein, the left and right inner wall surfaces respectively extend a third ear portion; the left and right inner wall surfaces respectively extend a fourth ear portion; the first ear portion and the third ear portion portion respectively extend to the left and right sides Bending and being wrapped in a buffer gap formed between the upper outer wall surface and the upper inner wall surface; wherein the second ear portion and the fourth ear portion are respectively bent to the left and right sides and covered on the lower outer wall surface In the buffer gap formed between the lower inner wall surface and the bottom wall surface, the four wall surfaces of the bottom of the box are further engaged with each other.