A symmetrical lid-type integrated two-box box

Through the design of a symmetrical cover-type two-box box, the combination structure of isosceles triangle and rectangular plate is used to solve the multi-function packaging needs of small households, and it realizes convenient product classification storage and carrying. It is suitable for small-volume products and has shelves. Display effect.

CN110254886BActive Publication Date: 2024-12-13GUANGDONG HONGCHENGHONG COLOR PRINTING CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN201910522065.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-06-17
Publication Date
2024-12-13
Estimated Expiration
2039-06-17

AI Technical Summary

Technical Problem

Existing packaging designs are difficult to meet the multi-functional needs of small households, especially to provide convenient product classification storage and carrying solutions while saving time and improving efficiency.

Method used

A symmetrical cover-type one-piece two-box box is designed, adopting a combined structure of isosceles triangles and rectangular plates. It forms a multi-purpose combination form through folding and bonding, and has an independent box structure for easy display and carrying.

Benefits of technology

It realizes a multi-purpose combination of the same product, meets consumers' needs for ease of storage and portability, and has shelf display effect. It is suitable for small-volume products such as snacks and nuts, and can be easily made into storage boxes.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN110254886B_ABST
    Figure CN110254886B_ABST
Patent Text Reader

Abstract

The present invention discloses a symmetrical lid-type integrated two-box box, comprising two isosceles triangle inner bottom plates, four isosceles triangle outer bottom plates, two rectangular connecting plates, four rectangular inner side plates and four rectangular outer side plates, wherein one short side of the two rectangular connecting plates is overlapped and connected, the bottom side of the isosceles triangle inner bottom plate is overlapped and connected with one long side of the rectangular connecting plate; one waist of the isosceles triangle inner bottom plate is overlapped and connected with one long side of a rectangular inner side plate, one short side of the rectangular inner side plate is overlapped and connected with one short side of another rectangular inner side plate; the other short side of the rectangular connecting plate is overlapped and connected with one short side of a rectangular outer side plate. The symmetrical lid-type integrated two-box box of the present invention has a certain shelf display, has a certain aesthetic feeling when the lid is opened, and has a wide range of uses.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The invention relates to a symmetrical cover-type integrated two-box box. Background Art

[0002] With the development of modern family population structure downsizing and the accelerated pace of life, people's consumption concepts have changed accordingly. The change in consumption patterns naturally leads to the change of packaging design based on human needs. In order to meet the habit of small families to consume once without surplus and people's requirements to save time and improve efficiency, the design of one-piece two-box box will be launched against this background. One-piece two-box box is a structural design for the collection and subpackaging of goods. While saving a certain amount of packaging costs for manufacturers, it also brings convenience to consumers in the process of using products, allowing goods to be stored in categories and convenient for consumers to use. At the same time, it can also be used as a storage and carrying container for goods so that the packaging can be reused. Summary of the invention

[0003] The purpose of the present invention is to provide a symmetrical lid-type integrated two-box box. The present invention has a certain shelf display, and has a certain aesthetic feeling when the lid is opened. It has a wide range of uses. It can be applied to small-volume objects of various shapes, for example, it can be used to package snacks with independent small packages. Nuts, candies. Since it can be formed with one piece of paper, it is relatively convenient to make and can be placed at home as a storage box.

[0004] In order to achieve the above object, the technical solution of the present invention is:

[0005] A symmetrical lid-type integrated two-box box, comprising 2 isosceles triangle inner bottom plates, 4 isosceles triangle outer bottom plates, 2 rectangular connecting plates, 4 rectangular inner side plates and 4 rectangular outer side plates, wherein the 2 isosceles triangle inner bottom plates and the 4 isosceles triangle outer bottom plates are of equal size; the 2 rectangular connecting plates are of equal size; the 4 rectangular inner side plates and the 4 rectangular outer side plates are of equal size; one of the short sides of the 2 rectangular connecting plates is overlapped and connected, the bottom side of the isosceles triangle inner bottom plate and one of the long sides of the rectangular connecting plate are overlapped and connected; the isosceles triangle inner bottom plate and the 4 isosceles triangle outer side plates ... One waist of the bottom plate is overlapped and connected with one of the long sides of a rectangular inner plate, and one of the short sides of the rectangular inner plate is overlapped and connected with one of the short sides of another rectangular inner plate; the other short side of the rectangular connecting plate is overlapped and connected with one of the short sides of a rectangular outer plate, and the other short side of the rectangular outer plate is overlapped and connected with one of the short sides of another rectangular outer plate; one of the long sides of the rectangular outer plate is overlapped and connected with the bottom side of an isosceles triangle outer bottom plate; and the adjacent isosceles triangle outer bottom plates are located on different sides of the rectangular outer plate.

[0006] The isosceles triangle inner bottom plate includes a first isosceles triangle inner bottom plate and a second isosceles triangle inner bottom plate; the isosceles triangle outer bottom plate includes a first isosceles triangle outer bottom plate, a second isosceles triangle outer bottom plate, a third isosceles triangle outer bottom plate and a fourth isosceles triangle outer bottom plate; the rectangular connecting plate includes a first rectangular connecting plate and a second rectangular connecting plate; the rectangular inner side plate includes a first rectangular inner side plate and a second rectangular inner side plate; the rectangular outer side plate includes a first rectangular outer side plate and a second rectangular outer side plate; the bottom side of the first isosceles triangle inner bottom plate overlaps and is connected with one long side of the first rectangular connecting plate and is pressed There is a first crease line; one short side of the first rectangular connecting plate is overlapped and connected with one short side of the second rectangular connecting plate and a second crease line is pressed; one long side of the second rectangular connecting plate is overlapped and connected with the bottom side of the second isosceles triangle inner bottom plate and a first crease line is pressed; one waist on the first isosceles triangle inner bottom plate and one waist on the second isosceles triangle inner bottom plate are respectively overlapped and connected with one long side of a first rectangular inner side plate and a third crease line is pressed, one short side of the first rectangular inner side plate is overlapped and connected with one short side of the second rectangular inner side plate and a fourth crease line is pressed, and the first The first rectangular inner side plate connected to the isosceles triangle inner bottom plate and the first rectangular inner side plate connected to the second isosceles triangle inner bottom plate are located on different sides; the second rectangular inner side plate connected to the first rectangular inner side plate on the first isosceles triangle inner bottom plate and the second rectangular inner side plate connected to the first rectangular inner side plate on the second isosceles triangle inner bottom plate are also located on different sides; the other short side of the first rectangular connecting plate is connected to and overlaps with a short side of a first rectangular outer side plate and is pressed with a fifth fold line; the other short side of the second rectangular connecting plate is also connected to and overlaps with a short side of a first rectangular outer side plate and is pressed with a fifth fold line; One of the long sides of the first rectangular outer panel connected to the first rectangular connecting panel overlaps and is connected to a waist of the second isosceles triangle outer bottom panel and is pressed with a sixth folding line; one of the long sides of the first rectangular outer panel connected to the second rectangular connecting panel overlaps and is connected to a waist of the third isosceles triangle outer bottom panel and is pressed with a sixth folding line; one of the long sides of one of the second rectangular outer panels overlaps and is connected to a waist of the first isosceles triangle outer bottom panel and is pressed with a seventh folding line; one of the long sides of another second rectangular outer panel overlaps and is connected to a waist of the fourth isosceles triangle outer bottom panel and is pressed with a seventh folding line;

[0007] The other short side of the first rectangular inner side panel overlaps and is connected to the bottom side of an isosceles trapezoidal bonding panel and is pressed with an eighth fold line; the one long side and the other short side of the second rectangular inner side panel overlap and are connected to the bottom side of an isosceles trapezoidal bonding panel and are pressed with an eighth fold line; the other waist of the first isosceles triangle outer bottom panel, the other waist of the second isosceles triangle outer bottom panel, the other waist of the third isosceles triangle outer bottom panel and the other waist of the fourth isosceles triangle outer bottom panel overlap and are connected to the bottom side of an isosceles trapezoidal bonding panel and are pressed with an eighth fold line;

[0008] A tongue insertion opening is provided at a middle position on a first fold line where the bottom side of the first isosceles triangle inner bottom plate overlaps with one long side of the first rectangular connecting plate; a rectangular tongue for inserting into the tongue insertion opening is provided at a middle position on a first fold line where the bottom side of the second isosceles triangle inner bottom plate overlaps with one long side of the second rectangular connecting plate, the rectangular tongue has a middle position of the first fold line as one of its long sides, the length of the long side of the rectangular tongue matches the length of the tongue insertion opening, and tongue insertion opening lines are provided with the two ends of the long side of the rectangular tongue as starting points, so that the tongue insertion opening line and the long side of the rectangular tongue at the middle position of the first fold line surround the rectangular tongue.

[0009] The beneficial effects of the present invention are as follows: a symmetrical lid-type integrated two-box box of the present invention places the same product quantity in two boxes, or places products of related uses therein, forming a combination of multi-purpose products. It meets the consumer's demand for easy storage and portability of products, and has a certain shelf display effect. When opened, it is symmetrical, and the two boxes are opened in two directions, one on the left and one on the right, and each is independent, with a certain aesthetic feeling, small size, and easy to carry. It can be applied to small-volume products of various shapes, for example, it can be used to package snacks, nuts, and candies with independent small packages. Since it can be formed with one piece of paper, it is more convenient to make and can be placed at home as a storage box. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the development of the present invention;

[0011] Figure 2 It is a schematic diagram showing the present invention after installation. DETAILED DESCRIPTION Example

[0012] like Figure 1 , 2As shown, a symmetrical lid-type integrated two-box box of the present embodiment comprises 2 isosceles triangle inner bottom plates, 4 isosceles triangle outer bottom plates, 2 rectangular connecting plates, 4 rectangular inner side plates and 4 rectangular outer side plates, and the 2 isosceles triangle inner bottom plates and the 4 isosceles triangle outer bottom plates are of equal size; the 2 rectangular connecting plates are of equal size; the 4 rectangular inner side plates and the 4 rectangular outer side plates are of equal size; one of the short sides of the 2 rectangular connecting plates is overlapped and connected, the bottom side of the isosceles triangle inner bottom plate and one of the long sides of the rectangular connecting plate are overlapped and connected; the isosceles triangle inner bottom plate and the rectangular connecting plate are of equal size ... One waist of the triangular inner bottom plate is overlapped and connected with one of the long sides of a rectangular inner side plate, and one of the short sides of the rectangular inner side plate is overlapped and connected with one of the short sides of another rectangular inner side plate; the other short side of the rectangular connecting plate is overlapped and connected with one of the short sides of a rectangular outer side plate, and the other short side of the rectangular outer side plate is overlapped and connected with one of the short sides of another rectangular outer side plate; one of the long sides of the rectangular outer side plate is overlapped and connected with the bottom side of an isosceles triangle outer bottom plate; and the adjacent isosceles triangle outer bottom plates are located on different sides of the rectangular outer side plate.

[0013] The isosceles triangle inner bottom plate includes a first isosceles triangle inner bottom plate 1 and a second isosceles triangle inner bottom plate 2; the isosceles triangle outer bottom plate includes a first isosceles triangle outer bottom plate 3, a second isosceles triangle outer bottom plate 4, a third isosceles triangle outer bottom plate 5 and a fourth isosceles triangle outer bottom plate 6; the rectangular connecting plate includes a first rectangular connecting plate 7 and a second rectangular connecting plate 8; the rectangular inner side plate includes a first rectangular inner side plate 9 and a second rectangular inner side plate 10; the rectangular outer side plate includes a first rectangular outer side plate 11 and a second rectangular outer side plate 12; the bottom side of the first isosceles triangle inner bottom plate 1 overlaps with one long side of the first rectangular connecting plate 7 and is pressed with a first Crease line 13; one short side of the first rectangular connecting plate 7 is overlapped and connected with one short side of the second rectangular connecting plate 8 and a second crease line 14 is pressed; one long side of the second rectangular connecting plate 8 is overlapped and connected with the bottom side of the second isosceles triangle inner bottom plate 2 and a first crease line 13 is pressed; one waist on the first isosceles triangle inner bottom plate 1 and one waist on the second isosceles triangle inner bottom plate 2 are overlapped and connected with one long side of a first rectangular inner side plate 9 and a third crease line 24 is pressed; one short side of the first rectangular inner side plate 9 is overlapped and connected with one short side of the second rectangular inner side plate 10 and a fourth crease line 16 is pressed; and the first isosceles triangle inner bottom plate 1 and the second isosceles triangle inner bottom plate 2 are overlapped and connected with one long side of a first rectangular inner side plate 9 and a third crease line 24 is pressed. The first rectangular inner side plate 9 connected to the angled inner bottom plate 1 and the first rectangular inner side plate 9 connected to the second isosceles triangle inner bottom plate 2 are located on different sides; the second rectangular inner side plate 10 connected to the first rectangular inner side plate 9 on the first isosceles triangle inner bottom plate 1 and the second rectangular inner side plate 10 connected to the first rectangular inner side plate 9 on the second isosceles triangle inner bottom plate 2 are also located on different sides; the other short side of the first rectangular connecting plate 7 is connected to a short side of a first rectangular outer side plate 11 and is pressed with a fifth folding line 17; the other short side of the second rectangular connecting plate 8 is also connected to a short side of a first rectangular outer side plate 11 and is pressed with a fifth folding line 17; the One of the long sides of the first rectangular outer panel 11 connected to the first rectangular connecting panel 7 is connected to a waist of the second isosceles triangle outer bottom panel 4 and is pressed with a sixth folding line 18; one of the long sides of the first rectangular outer panel 11 connected to the second rectangular connecting panel 8 is connected to a waist of the third isosceles triangle outer bottom panel 5 and is pressed with a sixth folding line 18; one of the long sides of one of the second rectangular outer panels 12 is connected to a waist of the first isosceles triangle outer bottom panel 3 and is pressed with a seventh folding line 19; one of the long sides of the other second rectangular outer panel 12 is connected to a waist of the fourth isosceles triangle outer bottom panel 6 and is pressed with a seventh folding line 19;

[0014] The other short side of the first rectangular inner panel 9 is connected to the bottom side of an isosceles trapezoidal bonding panel 15 and is pressed with an eighth folding line 20; the one long side and the other short side of the second rectangular inner panel 10 are connected to the bottom side of an isosceles trapezoidal bonding panel 15 and are pressed with an eighth folding line 20; the other waist of the first isosceles triangle outer bottom panel 3, the other waist of the second isosceles triangle outer bottom panel 4, the other waist of the third isosceles triangle outer bottom panel 5 and the other waist of the fourth isosceles triangle outer bottom panel 6 are connected to the bottom side of an isosceles trapezoidal bonding panel 15 and are pressed with an eighth folding line 20;

[0015] A tongue opening 21 is provided at the middle position of the first fold line 13 where the bottom side of the first isosceles triangle inner bottom plate 1 overlaps with one long side of the first rectangular connecting plate 7; a rectangular tongue 22 for inserting into the tongue opening 21 is provided at the middle position of the first fold line 13 where the bottom side of the second isosceles triangle inner bottom plate 2 overlaps with one long side of the second rectangular connecting plate 8, the rectangular tongue 22 has the middle position of the first fold line 13 as one of the long sides of the rectangular tongue, the length of the long side of the rectangular tongue matches the length of the tongue opening 21, and tongue opening lines 23 are provided with the two ends of the long side of the rectangular tongue as starting points, so that the tongue opening line 23 and the long side of the rectangular tongue at the middle position of the first fold line 13 surround the rectangular tongue 22.

[0016] First, the first rectangular inner side panel 9 and the second rectangular inner side panel 10 are folded at 90 degrees to the first isosceles triangle inner bottom panel 1 and the second isosceles triangle inner bottom panel 2 connected thereto, respectively, the first rectangular connecting panel 7 is also folded at 90 degrees to the first isosceles triangle inner bottom panel 1, and the second rectangular connecting panel 8 is also folded at 90 degrees to the second isosceles triangle inner bottom panel 2; and the first rectangular inner side panel 9, the second rectangular inner side panel 10, the first isosceles triangle inner bottom panel 1 and the first rectangular connecting panel 7 are surrounded by the isosceles trapezoidal bonding panels 15 connected to each other to form a first rectangular inner box; the first rectangular inner side panel 9, the second rectangular inner side panel 10, the second isosceles triangle inner bottom panel 2 and the second rectangular connecting panel 8 are surrounded by the second rectangular inner box;

[0017] Then, the first rectangular outer panel 11 and the second rectangular outer panel 12 are folded at a 90-degree angle, and the second isosceles triangle outer bottom panel 4 and the third isosceles triangle outer bottom panel 5 are folded at a 90-degree angle with the first rectangular outer panel 11 connected thereto; the first isosceles triangle outer bottom panel 3 and the fourth isosceles triangle outer bottom panel 6 are folded at a 90-degree angle with the second rectangular outer panel 12 connected thereto, so that the isosceles trapezoidal bonding panels 15 on the second isosceles triangle outer bottom panel 4 and the third isosceles triangle outer bottom panel 5 can just fit with the second rectangular outer bottom panel 12. The side panels 12 are bonded together, and the isosceles trapezoidal bonding panels 15 on the first isosceles triangle outer bottom panel 3 and the fourth isosceles triangle outer bottom panel 6 can just bond with the first rectangular outer side panel 11, so as to form a first isosceles triangle outer box composed of the first isosceles triangle outer bottom panel 3, the second isosceles triangle outer bottom panel 4, the first rectangular outer side panel 11 and the second rectangular outer side panel 12; and a second isosceles triangle outer box composed of the third isosceles triangle outer bottom panel 5, the fourth isosceles triangle outer bottom panel 6, the first rectangular outer side panel 11 and the second rectangular outer side panel 12;

[0018] Then, the first rectangular connecting plate 7 and the second rectangular connecting plate 8 are overlapped back to back and fixed by inserting the rectangular inserting tongue 22 into the inserting tongue opening 21. Then, the first rectangular outer box can be moved to fit outside the first rectangular inner box, and the second rectangular outer box can fit outside the second rectangular inner box to form an integrated structure.

[0019] By moving the first isosceles triangle outer box and the second isosceles triangle outer box, the items in the first isosceles triangle inner box and the second isosceles triangle inner box can be presented in front of the eyes, or the first isosceles triangle inner box and the second isosceles triangle inner box can be moved so that the first isosceles triangle outer box and the second isosceles triangle outer box are located inside the first isosceles triangle outer box and the second isosceles triangle outer box, so that the first isosceles triangle outer box and the second isosceles triangle outer box can act as box covers.

[0020] A symmetrical lid-type integrated two-box box of this embodiment places the same product quantity in two boxes, or places products of related uses therein, forming a combination of multi-purpose products. It meets the consumer's demand for easy storage and portability of products, and has a certain shelf display effect. When opened, it is symmetrical, and the two boxes are opened in two directions, one on the left and one on the right, and each is independent, with a certain aesthetic feeling, small size, and easy to carry. It can be applied to small-volume products of various shapes, for example, it can be used to package snacks, nuts, and candies with independent small packages. Since it can be formed with one piece of paper, it is more convenient to make and can be placed at home as a storage box.

Claims

1. A symmetrical lid-type integrated two-box box, characterized in that: It comprises 2 isosceles triangle inner bottom plates, 4 isosceles triangle outer bottom plates, 2 rectangular connecting plates, 4 rectangular inner side plates and 4 rectangular outer side plates, and the 2 isosceles triangle inner bottom plates and the 4 isosceles triangle outer bottom plates are of equal size; the 2 rectangular connecting plates are of equal size; the 4 rectangular inner side plates and the 4 rectangular outer side plates are of equal size; one of the short sides of the 2 rectangular connecting plates is overlapped and connected, the bottom side of the isosceles triangle inner bottom plate is overlapped and connected with one of the long sides of the rectangular connecting plate; one of the waists of the isosceles triangle inner bottom plate is overlapped and connected with one of the long sides of a rectangular inner side plate, and one of the short sides of the rectangular inner side plate is overlapped and connected with another rectangular One of the short sides of the inner side plate is overlapped and connected; the other short side of the rectangular connecting plate is overlapped and connected with one of the short sides of a rectangular outer side plate, and the other short side of the rectangular outer side plate is overlapped and connected with one of the short sides of another rectangular outer side plate; one of the long sides of the rectangular outer side plate is overlapped and connected with the bottom side of an isosceles triangle outer bottom plate; and adjacent isosceles triangle outer bottom plates are located on different sides of the rectangular outer side plate; the isosceles triangle inner bottom plate comprises a first isosceles triangle inner bottom plate (1) and a second isosceles triangle inner bottom plate (2); the isosceles triangle outer bottom plate comprises a first isosceles triangle outer bottom plate (3), a second isosceles triangle outer bottom plate (4), a third isosceles triangle outer bottom plate (5) and A fourth isosceles triangle outer bottom plate (6); the rectangular connecting plate comprises a first rectangular connecting plate (7) and a second rectangular connecting plate (8); the rectangular inner side plate comprises a first rectangular inner side plate (9) and a second rectangular inner side plate (10); the rectangular outer side plate comprises a first rectangular outer side plate (11) and a second rectangular outer side plate (12); the bottom side of the first isosceles triangle inner bottom plate (1) overlaps and is connected to a long side of the first rectangular connecting plate (7) and is pressed with a first folding line (13); a short side of the first rectangular connecting plate (7) overlaps and is connected to a short side of the second rectangular connecting plate (8) and is pressed with a second folding line (14); the second rectangular connecting plate (8) One long side of the first isosceles triangle inner bottom plate (1) is connected to the bottom side of the second isosceles triangle inner bottom plate (2) and a first folding line (13) is pressed; one waist on the first isosceles triangle inner bottom plate (1) and one waist on the second isosceles triangle inner bottom plate (2) are respectively connected to one long side of a first rectangular inner side plate (9) and a third folding line (24) is pressed; one short side of the first rectangular inner side plate (9) is connected to one short side of the second rectangular inner side plate (10) and a fourth folding line (16) is pressed; and the first rectangular inner side plate (9) connected to the first isosceles triangle inner bottom plate (1) and the first rectangular inner side plate (9) connected to the second isosceles triangle inner bottom plate (2) are located on different sides;The second rectangular inner side plate (10) connected to the first rectangular inner side plate (9) on the first isosceles triangle inner bottom plate (1) is also located on different sides from the second rectangular inner side plate (10) connected to the first rectangular inner side plate (9) on the second isosceles triangle inner bottom plate (2); the other short side of the first rectangular connecting plate (7) is overlapped and connected to a short side of a first rectangular outer side plate (11) and a fifth folding line (17) is pressed thereon; the other short side of the second rectangular connecting plate (8) is also overlapped and connected to a short side of a first rectangular outer side plate (11) and a fifth folding line (17) is pressed thereon; the first rectangular outer side plate (11) connected to the first rectangular connecting plate (7) is overlapped and connected to a short side of a first rectangular outer side plate (11) and a fifth folding line (17) is pressed thereon; ) has one long side overlapped with one waist of the second isosceles triangle outer bottom plate (4) and is pressed with a sixth folding line (18); one long side of the first rectangular outer side plate (11) connected to the second rectangular connecting plate (8) is overlapped with one waist of the third isosceles triangle outer bottom plate (5) and is pressed with a sixth folding line (18); one long side of one of the second rectangular outer side plates (12) is overlapped with one waist of the first isosceles triangle outer bottom plate (3) and is pressed with a seventh folding line (19); one long side of another second rectangular outer side plate (12) is overlapped with one waist of the fourth isosceles triangle outer bottom plate (6) and is pressed with a seventh folding line (19); The other short side of the first rectangular inner side plate (9) is overlapped and connected with the bottom side of an isosceles trapezoidal bonding plate (15) and pressed with an eighth folding line (20); the one long side and the other short side of the second rectangular inner side plate (10) are respectively overlapped and connected with the bottom side of an isosceles trapezoidal bonding plate (15) and pressed with an eighth folding line (20); the other waist of the first isosceles triangle outer bottom plate (3), the other waist of the second isosceles triangle outer bottom plate (4), the other waist of the third isosceles triangle outer bottom plate (5) and the other waist of the fourth isosceles triangle outer bottom plate (6) are respectively overlapped and connected with the bottom side of an isosceles trapezoidal bonding plate (15) and pressed with an eighth folding line (20); A tongue insertion opening (21) is provided at the middle position of a first fold line (13) where the bottom side of the first isosceles triangle inner bottom plate (1) overlaps and connects with one long side of the first rectangular connecting plate (7); a rectangular tongue insertion (22) for inserting into the tongue insertion opening (21) is provided at the middle position of a first fold line (13) where the bottom side of the second isosceles triangle inner bottom plate (2) overlaps and connects with one long side of the second rectangular connecting plate (8); the rectangular tongue insertion (22) has the middle position of the first fold line (13) as one of its long sides, the length of the long side of the rectangular tongue insertion matches the length of the tongue insertion opening (21), and a tongue insertion opening line (23) is provided with two ends of the long side of the rectangular tongue insertion as starting points, so that the long sides of the rectangular tongue insertion at the middle position of the tongue insertion opening line (23) and the first fold line (13) surround the rectangular tongue insertion (22).