Lid closing structure

Abstract

To provide a lid closing structure capable of providing user convenience.SOLUTION: A lid forming flap 21 includes a lid surface 22 that closes an opening 2, and a covering piece 23 that covers at least a part of the outside of a peripheral wall surface 11 when the lid surface 22 closes the opening 2. A hole 15 or a slit is formed in the peripheral wall surface 11. An insertion piece 25 is formed by the slit in the covering piece 23. When the lid forming flap 21 is closed, at least a part of the outside of the peripheral wall surface 11 is covered with the covering piece 23. An insertion piece 25 is folded inside the box, thus the insertion piece 25 is inserted into and engaged with the hole 15 or the slit of the peripheral wall surface 11, and the lid forming flap 21 is fixed to the peripheral wall surface 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lid closing structure for closing a lid in a box such as a cardboard box.

Background Art

[0002] Conventionally, cardboard boxes have been widely used as packaging boxes. As such a cardboard box, a so-called A-type cardboard box in which flaps are extended on the length surface and the width surface forming the peripheral surface is common. In the A-type cardboard box, an upper lid and a bottom plate are formed by upper and lower flaps. As a method of sealing the upper lid and the bottom plate with the flaps, stapling or sticking an adhesive tape is generally performed.

[0003] Further, Patent Document 1 describes a cardboard case in which a fitting piece provided on a flap constituting an upper lid is engaged with a fitting notch for sealing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described sealing method using staples or adhesive tapes, corresponding tools must be prepared, and in most cases, the tools are not present at hand in a large work site. Therefore, it is necessary to go far to get the tools, and the sealing work has been extremely troublesome. In particular, in the case of stapling, it is a work that is burdensome for the elderly, and there are problems such as damaging the stored items and having to remove them for separation after use.

[0006] In addition, in the cardboard case described in Patent Document 1, since the flaps constituting the upper lid are sealed by inserting fitting pieces or the like at a plurality of locations, the operation of closing the upper lid requires time and effort. Further, since the fitting pieces or the like are inserted into the unstable flaps for sealing, the closing strength cannot be said to be sufficient.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a lid closing structure that can facilitate the use of the box.

Means for Solving the Problems

[0008] The lid closing structure of the present invention forms a peripheral surface of a box shape with a plate-like portion surrounding a space, forms an opening inside one side of the peripheral surface, and extends a flap to form a lid forming flap on a part of one side of the peripheral surface. In the box, the lid forming flap has a lid surface that closes the opening, and when the lid surface closes the opening, it has a covering piece that covers at least a part of the outside of the peripheral surface. A hole or a cut is formed in the peripheral surface, and an insertion piece is formed in the covering piece by the cut. When closing the lid forming flap, at least a part of the outside of the peripheral surface is covered with the covering piece, and the insertion piece is folded toward the inside of the box, so that the insertion piece is inserted into the hole or the cut in the peripheral surface and meshes therewith, and the lid forming flap is fixed to the peripheral surface.

[0009] In addition, the lid closing structure of the present invention includes a box body that forms a first peripheral surface with a plate-shaped portion surrounding a space, forms an opening inside one side of the first peripheral surface, and forms a closing surface on the other side of the first peripheral surface, and a lid body that forms a second peripheral surface with a plate-shaped portion surrounding the first peripheral surface of the box body in a state of being attached to the box body, forms an opening into which one side of the first peripheral surface of the box body is inserted inside one side of the second peripheral surface, and forms a closing surface that closes the opening of the box body in a state of being attached to the box body. In the box, a hole or a notch is formed on the first peripheral surface of the box body, an insertion piece is formed on the second peripheral surface of the lid body by a notch, and when the lid body is closed on the box body, the first side of the box body is inserted into the opening of the lid body, and the insertion piece is folded toward the inside of the box body, so that the insertion piece is inserted into the hole or the notch on the first peripheral surface of the box body and engages therewith, thereby fixing the lid body to the box body.

[0010] The insertion piece is formed of a connection portion on the proximal end side connected to the second peripheral surface of the lid body and a wing portion having a portion larger than the connection portion.

Effect of the Invention

[0011] According to the present invention, the convenience of the user can be achieved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0013] <First Embodiment> FIG. 1 is a first explanatory view showing a lid closing structure according to a first embodiment of the present invention. FIG. 2(a) is a second explanatory view showing a lid closing structure according to a first embodiment of the present invention.

[0014] In FIG. 1(a), the cardboard box 1 to which the lid closing structure of the first embodiment is applied is formed by bending cardboard and is composed of peripheral wall surfaces 11 to 14 that form a box-shaped peripheral surface. The peripheral wall surfaces 11 to 14 are shaped to surround the front, rear, left, and right of the space by bending and pasting with paste margin pieces.

[0015] An opening 2 is formed on one side of the peripheral wall surfaces 11 to 14. The other side of the peripheral wall surfaces 11 to 14 is closed by a bottom surface 3. The bottom surface 3 is formed by fitting bottom surface pieces extending from the other side of the peripheral wall surfaces 11 to 14 to each other.

[0016] A lid forming flap 21 is extended on one side of the peripheral wall surface 12 that is a part of one side of the peripheral surface.

[0017] The lid forming flap 21 has a lid surface 22 that closes the opening 2 and an overhanging piece 23 that extends from the lid surface 22 toward the tip and covers the upper part outside the peripheral wall surface 11 when the lid surface 22 closes the opening 2. The boundary between the lid surface 22 and the overhanging piece 23 is bent toward the peripheral wall surface 11 side by a bending line 24.

[0018] A trapezoidal hole 15 is formed near one side of the peripheral wall surface 11. The short side of the trapezoidal hole 15 faces one side direction of the peripheral wall surface 11.

[0019] An insertion piece 25 formed by a cut is formed at the position of the overhanging piece 23 corresponding to the trapezoidal hole 15.

[0020] The insertion piece 25 is formed of a connection part 26 on the proximal end side that connects to the overhanging piece 23 and a wing part 27 having an equal-sized part wider than the connection part 26.

[0021] On one side of the peripheral wall surface 13, a short flap 16 that supports the lid surface 22 when closing the opening 2 is extended.

[0022] On one side of the peripheral wall surface 14, a short flap 17 that supports the lid surface 22 when closing the opening 2 is extended.

[0023] When closing the lid forming flap 21, the opening 2 is covered with the lid surface 22, and by making the folding line 24 a mountain fold, as shown in Fig. 1(b), the covering piece 23 covers the outer upper part of the peripheral wall surface 11.

[0024] After that, as shown in Fig. 1(c), using the index finger 4 of the operator, the insertion piece 25 of the covering piece 23 is pushed, and the insertion piece 25 is folded toward the inside of the cardboard box 1, so that, as shown in Fig. 2(a), the insertion piece 25 is inserted into the trapezoidal hole 15 of the peripheral wall surface 11 and meshes, and the lid forming flap 21 is fixed to the peripheral wall surface 11.

[0025] In this way, after closing the opening 2 with the lid forming flap 21 (after closing the lid), the cardboard box 1 can be locked by simply pushing the insertion piece 25 (specific part) inward with a finger.

[0026] Therefore, it can be locked without using an adhesive (glue) or an adhesive tape (sticky tape).

[0027] By varying the shapes of the insertion piece 25 of the covering piece 23 and the trapezoidal hole 15 of the peripheral wall surface 11, various lid locking structures can be achieved.

[0028] Depending on the shapes of the insertion piece 25 of the covering piece 23 and the hole 15 of the peripheral wall surface 11, it can also be structured so that it cannot be opened without breaking a break line or the like. Therefore, if it is applied to a delivery cardboard box or a mail - order cardboard box, security during transportation can be ensured.

[0029] If the lid locking structure is made into a shape different from the above, the lock can also be unlocked, so as a reusable specification, it is possible to avoid being used up only once.

[0030] As a developed view of the cardboard box 1, since no new protruding parts or additional items are added, the conventional paper formwork can be used as it is, and it can function only by processing "holes" and "cuts".

[0031] In addition, in the first embodiment shown in FIG. 1, the hole 15 in the peripheral wall surface 11 is used as the insertion portion into which the wing portion 27 of the insertion piece 25 is inserted. However, as the insertion portion, a cut having a shape close to the inner periphery of the hole 15 may be formed in the peripheral wall surface 11.

[0032] Also, the shapes of the insertion piece 25 and the hole 15 are not limited to the shapes shown in FIG. 1, and various shapes such as an ellipse, a square, and a trapezoid are applicable.

[0033] <Configuration and Effects of the First Embodiment> Summarizing the configuration and effects of the first embodiment, the lid closing structure of the first embodiment forms a box-shaped peripheral surface with plate-like portions (peripheral wall surfaces 11 to 14) surrounding a space, forms an opening 2 inside one side of the peripheral surface, and extends a flap on a part (peripheral wall surface 12) of one side of the peripheral surface to form a lid-forming flap 21. In the box (cardboard box 1), the lid-forming flap 21 has a lid surface 22 for closing the opening 2 and a covering piece 23 for covering at least a part of the outside of the peripheral surface when the lid surface 22 closes the opening 2. A hole 15 or a cut is formed in the peripheral surface, an insertion piece 25 formed by a cut is formed in the covering piece 23, and when closing the lid-forming flap 21, at least a part of the outside of the peripheral surface is covered with the covering piece 23, and the insertion piece 25 is folded toward the inside of the box, so that the insertion piece 25 is inserted into the hole 15 or the cut in the peripheral surface and engages therewith, and the lid-forming flap is fixed to the peripheral surface. This is the feature.

[0034] Since it has such a configuration, when closing the lid-forming flap 21, the lid-closing structure of the first embodiment only needs to cover at least a part of the outer side of the peripheral surface with the covering piece 23 and fold the insertion piece 25 toward the inside of the box. Therefore, the labor and time required for closing the lid-forming flap 21 can be reduced. In addition, the lid-forming flap 21 is fixed to the peripheral surface of the box (corrugated box 1) by the hole 15 formed in the peripheral surface and the insertion piece 25 formed in the covering piece 23, so the closing strength is improved. As a result, a lid-closing structure that can facilitate the use of the box can be provided.

[0035] <Second Embodiment> Figure 2(b) is an explanatory diagram showing the lid-closing structure according to the second embodiment of the present invention.

[0036] In Figure 2(b), the corrugated box 101 to which the lid-closing structure of the second embodiment is applied includes a box body 102 and a lid body 103.

[0037] The box body 102 is formed by folding corrugated cardboard and has peripheral wall surfaces 211 to 214 that form a box-shaped peripheral surface. The peripheral wall surfaces 211 to 214 are shaped to surround the front, rear, left, and right of the space by folding and pasting with paste margin pieces.

[0038] An opening 201 is formed on one side of the peripheral wall surfaces 211 to 214. The other side of the peripheral wall surfaces 211 to 214 is closed by a bottom surface 202. The bottom surface 202 is formed by fitting bottom surface pieces extending from the other side of the peripheral wall surfaces 211 to 214 together.

[0039] The lid body 103 is formed by folding corrugated cardboard and consists of a lid surface 301 and peripheral wall surfaces 311 to 314 that form a box-shaped peripheral surface. The lid surface 301 and the peripheral wall surfaces 311 to 314 are shaped to surround the top and front, rear, left, and right of the space by folding and pasting with paste margin pieces.

[0040] An opening 302 is formed on one side of the peripheral wall surfaces 311 to 314. The other side of the peripheral wall surfaces 311 to 314 is closed by the lid surface 301. One side of the peripheral wall surfaces 211 to 214 of the box body 102 is inserted into the opening 302 of the lid body 103.

[0041] A trapezoidal hole 215 is formed near one side of the peripheral wall surface 211 of the box body 102. The short side of the trapezoidal hole 215 faces one side direction of the peripheral wall surface 211.

[0042] An insertion piece 315 formed by a cut is formed at the position of the peripheral wall surface 311 of the lid body 103 corresponding to the trapezoidal hole 215.

[0043] The insertion piece 315 is formed by a connection portion 316 on the proximal end side connected to the peripheral wall surface 311 of the lid body 103 and a wing portion 317 having an equal-sized portion wider than the connection portion 316.

[0044] When closing the lid body 103, by inserting one side of the peripheral wall surfaces 211 to 214 of the box body 102 into the opening 302 of the lid body 103, the opening 201 of the box body 102 is covered with the lid surface 301, and the peripheral wall surfaces 311 to 314 of the lid body 103 cover the upper portions of the peripheral wall surfaces 211 to 214 of the box body 102. After that, using the index finger of the operator, press with the insertion piece 315 on the peripheral wall surface 311 of the lid body 103 and fold the insertion piece 315 toward the inside of the cardboard box 1, so that the insertion piece 315 is inserted into the trapezoidal hole 215 on the peripheral wall surface 211 and meshes, and the lid body 103 is fixed to the peripheral wall surface 211.

[0045] In this way, after closing the opening 201 of the box body 102 with the lid body 103 (after closing the lid), the cardboard box 1 can be closed (locked) only by pushing the insertion piece 315 (specific part) inward with a finger.

[0046] Therefore, it can be closed (locked) without using an adhesive (glue) or an adhesive tape (sticky tape). Due to the variations in the shapes of the insertion piece 315 on the peripheral wall surface 311 of the lid body 103 and the trapezoidal hole 215 on the peripheral wall surface 211 of the box body 102, various lid closing structures (locking mechanisms) can be obtained.

[0047] Depending on the shapes of the insertion piece 315 on the peripheral wall surface 311 of the lid body 103 and the trapezoidal hole 215 on the peripheral wall surface 211 of the box body 102, it is also possible to adopt a structure that cannot be opened without breaking a broken line or the like. Therefore, if it is applied to a delivery cardboard box or a mail-order corrugated box, etc., security during transportation can be ensured.

[0048] If the lid closing structure (locking mechanism) is made into a shape different from the above, the lock can also be unlocked. Therefore, as a reuse specification, it is also possible to avoid single-use exhaustion.

[0049] As a development view of the corrugated box 1, since no new protrusion or addition is made, the conventional paper mold can be used as it is, and it can function only by processing "holes" and "cuts".

[0050] In addition, in the second embodiment shown in Fig. 2(a), the hole 215 in the peripheral wall surface 211 is used as the insertion portion into which the wing portion 317 of the insertion piece 315 is inserted. However, as the insertion portion, a cut having a shape close to the inner circumference of the hole 215 may be formed in the peripheral wall surface 211.

[0051] Also, the shapes of the insertion piece 315 and the hole 215 are not limited to the shapes shown in Fig. 2(a), and various shapes such as an ellipse, a square, and a trapezoid are applicable.

[0052] <Configuration and Effects of the Second Embodiment> The configuration and effects of the second embodiment will be described together. The lid closing structure of the second embodiment forms a first peripheral surface with a plate-shaped portion (peripheral wall surfaces 211 to 214) surrounding a space, forms an opening 201 inside one side of the first peripheral surface, and forms a closing surface (bottom surface 202) on the other side of the first peripheral surface. A box body 102, and a plate-shaped portion (peripheral wall surfaces 311 to 314) that forms a second peripheral surface and surrounds the first peripheral surface of the box body 102 in a state of being attached to the box body 102. An opening 302 into which one side of the first peripheral surface of the box body 102 is inserted is formed inside one side of the second peripheral surface, and a closing surface (lid surface 301) that closes the opening 201 of the box body 102 in a state of being attached to the box body 102. In a box (corrugated box 1) including a lid body 103, a hole 215 or a notch is formed in the first peripheral surface of the box body 102, and an insertion piece 315 formed by a notch is formed in the second peripheral surface of the lid body 103. When closing the lid body 103 on the box body 102, insert the first side of the box body 102 into the opening 302 of the lid body 103, and fold the insertion piece 315 toward the inside of the box body 102, so that the insertion piece 315 is inserted into the hole 215 or the notch on the first peripheral surface of the box body 102 and meshes, and the lid body 103 is fixed to the box body 102. It is characterized by that.

[0053] The insertion piece 315 is characterized in that it is formed by a connection portion 316 on the proximal end side connected to the second peripheral surface of the lid body 103 and a wing portion 317 having a portion larger than the connection portion 316.

[0054] Due to having such a configuration, when closing the lid body 103, the lid closing structure of the second embodiment only needs to attach the lid body 103 to the box body 102 and fold the insertion piece 315 toward the inside of the box. Therefore, the labor and time in the operation of closing the lid body 103 can be reduced, and the lid body 103 is fixed to the peripheral surface of the box (corrugated box 1) by the hole 215 formed in the peripheral wall surface 211 of the box body 102 and the insertion piece 315 formed in the peripheral wall surface 311 of the lid body 103, so the closing strength is improved. Thereby, a lid closing structure that can facilitate the use of the box can be provided.

[0055] <Third Embodiment> FIG. 3 is an explanatory view showing a lid closing structure according to the third embodiment of the present invention.

[0056] In the third embodiment, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted.

[0057] In FIG. 3, the cardboard box 401 to which the lid closing structure of the third embodiment is applied is formed by bending cardboard, and includes peripheral wall surfaces 411, 12 to 14 that form a box-shaped peripheral surface.

[0058] An opening 2 is formed on one side of the peripheral wall surfaces 411, 12 to 14. The other side of the peripheral wall surfaces 411, 12 to 14 is closed by a bottom surface 403. The bottom surface 403 is formed by fitting bottom pieces extending from the other side of the peripheral wall surfaces 411, 12 to 14 to each other.

[0059] A lid forming flap 421 is extended on one side of the peripheral wall surface 12 that is a part of one side of the peripheral surface.

[0060] The lid forming flap 421 has a lid surface 22 that closes the opening 2, and an overlying piece 423 that extends from the lid surface 22 toward the tip and covers the entire outside of the peripheral wall surface 411 when the lid surface 22 closes the opening 2. Therefore, the lid forming flap 421 extends the overlying piece 423 (covering flap) following the lid surface 22 so as to reach the bottom surface 403. The boundary between the lid surface 22 and the overlying piece 423 is bent toward the peripheral wall surface 411 side by a bending line 424.

[0061] Band portions 433 are formed on the peripheral wall surface 411 and the bottom surface 403 by two cuts 431, 432 that cross the bending line 404 therebetween.

[0062] The band portion 433 is composed of a band portion 433a on the bottom surface 403 side and a band portion 433b on the peripheral wall surface 411 side. The band portion 433a on the bottom surface 403 side has the cuts 431 and 432 being straight and parallel, and the width is constant toward the peripheral wall surface 12 side (rear). The band portion 433b on the peripheral wall surface 411 side has the cuts 431 and 432 being straight, and at the portion of the peripheral wall surface 411, it is a cut in the shape of the hole 15 of the first embodiment described with reference to FIG. 1.

[0063] A plurality of lateral cuts 434 are formed in the band portion 433 so that it can easily bend into the box by an external force.

[0064] At the position of the covering piece 423 corresponding to the band portion 433b on the peripheral wall surface 411 side, an insertion piece 425 formed by a cut is provided.

[0065] The insertion piece 425 is formed by a connecting portion 426 on the proximal end side connected to the covering piece 423 and a wing portion 427 having an equal-sized portion wider than the connecting portion 426.

[0066] When closing the lid-forming flap 421, a valley fold is made between the peripheral wall surface 12 and the lid surface 22 to close the opening 2 with the lid surface 22, the folding line 424 is made into a valley fold, and the entire outer side of the peripheral wall surface 411 is covered with the covering piece 423.

[0067] After that, by pressing the insertion piece 425 with a finger and folding the insertion piece 425 toward the inside of the cardboard box 401, the band portion 433 bends toward the inside and outside of the box, and both sides of the wing portion 427 of the insertion piece 425 are inserted into the openings formed on both sides of the band portion 433 by the cuts 431 and 432 and engage with each other, fixing the lid-forming flap 421 to the peripheral wall surface 411.

[0068] In this way, the cardboard box 401 can be closed (locked) by simply closing the opening 2 with the lid-forming flap 421 (after closing the lid), covering the entire outer side of the peripheral wall surface 411 with the covering piece 423, and then pushing the insertion piece 425 (specific part) inward with a finger.

[0069] Therefore, the cardboard box 401 can be locked without using adhesives (glue) or adhesive tapes (gum tapes).

[0070] Also, on the peripheral wall surface 411, instead of "holes", two cuts 431 and 432 connected from the bottom surface 403 are provided, and a band portion 433b with an inverted trapezoidal portion is provided. Several horizontal cuts 434 are also made so that it can easily bend inside the box by an external force. When the wing portion 427 of the insertion piece 425 is pushed into such a portion, the band portion 433 partially enters the box while receiving the wing portion 427. Therefore, even when it is locked, for example, by pulling the band portion 433 with the index finger and thumb and pinching the wing portion 427 of the insertion piece 425 with the index finger and thumb and pulling it out from inside the box, the lock can be released. For this reason, the cardboard box 401 can also avoid being used up once as a reusable specification.

[0071] In addition, the shapes of the insertion piece 425 and the band portion 433 are not limited to the shapes shown in FIG. 3, and various shapes such as an ellipse, a square, and a trapezoid are applicable.

[0072] As a developed view of the cardboard box 401, since no new protrusions or additional items are added, the conventional paper mold can be used as it is, and it can function only by processing "holes" and "cuts".

[0073] <Configuration and Effects of the Third Embodiment> Summarizing the configuration and effects of this embodiment, the lid closing structure of the third embodiment forms a box-shaped peripheral surface with plate-shaped portions (peripheral wall surfaces 411, 12 to 14) surrounding a space, forms an opening 2 inside one side of the peripheral surface, and extends a flap on a part (peripheral wall surface 12) of one side of the peripheral surface to form a lid-forming flap 421. In the box (corrugated box 401), the lid-forming flap 421 has a lid surface 422 that closes the opening 2, and a covering piece 423 that covers the outside of the peripheral surface when the lid surface 422 closes the opening 2. On the peripheral wall surface 411 and the bottom surface 403, a band portion 433 is formed by two cuts 431, 432 that cross the folding line 404 in between. The lid-forming flap 421 has an insertion piece 425 formed by a cut at a position in contact with or near the band portion 433 when the outside of the peripheral surface is covered with the covering piece 423. When closing the lid-forming flap 421, the opening 2 is closed with the lid surface 422, the outside of the peripheral surface is covered with the covering piece 423, and the insertion piece 425 is folded toward the inside of the box, so that the band portion 433 bends toward the inside of the box, and both sides of the insertion piece 425 are inserted into and engaged with the openings formed on both sides of the band portion 433, thereby fixing the lid-forming flap 421 to the peripheral surface. This is the feature.

[0074] Due to having such a configuration, when closing the lid-forming flap 421, the lid closing structure of the third embodiment only needs to close the opening 2 with the lid surface 422, cover the outside of the peripheral surface with the covering piece 423, and fold the insertion piece 425 toward the inside of the box. Therefore, the labor and time in the operation of closing the lid-forming flap 421 can be reduced. Also, the front lid-forming flap 421 is fixed to the peripheral surface of the box (corrugated box 401) by the openings formed on both sides of the band portion 433 and the insertion piece 425 formed on the lid-forming flap 421, so the closing strength is improved. Thereby, a lid closing structure that can facilitate the user of the box can be provided.

[0075] <Application Example of the Embodiment> FIG. 4 is an explanatory diagram showing the lid closing structure of an application example of the embodiment of the present invention.

[0076] In the application example of the embodiment, the parts not shown are the same as those in the first embodiment shown in FIG. 1, and will be described with reference to FIG. 1, and some descriptions are omitted.

[0077] In FIG. 4, the cardboard box to which the lid closing structure of the application example of the embodiment is applied is formed by bending cardboard, and includes peripheral wall surfaces 511, 12 to 14 (see FIG. 1) that form the peripheral surface of the box shape.

[0078] Near one side of the peripheral wall surface 511, cuts 515 are formed by the long side, both oblique sides, and both sides of the short side of the trapezoid. The short side of the trapezoid faces one side direction of the peripheral wall surface 511.

[0079] On one side of the peripheral wall surface 12 (see FIG. 1) that forms a part of one side of the peripheral surface, a lid forming flap 521 is extended.

[0080] The lid forming flap 521 has a lid surface 522 that closes the opening 2 (see FIG. 1), and a covering piece 523 that extends from the lid surface 522 toward the tip and covers the upper part outside the peripheral wall surface 511 when the lid surface 522 closes the opening 2. The boundary between the lid surface 522 and the covering piece 523 is bent toward the peripheral wall surface 511 side by a folding line 524.

[0081] At the position of the covering piece 523 corresponding to the trapezoidal cut 515, an insertion piece 525 formed by the cut is formed.

[0082] The insertion piece 525 is formed by a connection part 526 on the base end side that connects to the covering piece 523 and a wing part 527 having an equal-sized part wider than the connection part 526. In addition, in the application example of the embodiment, from both the left and right sides of the connection part 526 toward the folding line 524 on the lid surface 522 side, left and right breaking lines 528L and 528R necessary for opening the lid forming flap 521 are formed. On the folding line 524 side of the lid surface 522, a part 529 serving as a handle whose one end and the other end are connected to the left and right breaking lines 528L and 528R is formed.

[0083] When closing the lid-forming flap 521, the opening 2 (see Fig. 1) is covered with the lid surface 522, and by making the folding line 524 a mountain fold, the covering piece 523 covers the upper outer part of the peripheral wall surface 511.

[0084] After that, using the index finger of the operator, press the insertion piece 525 of the covering piece 523 and fold the insertion piece 525 toward the inside of the cardboard box, so that the insertion piece 525 is inserted into and engaged with the cut 515 formed by the long side and both oblique sides of the trapezoid on the peripheral wall surface 511, and the lid-forming flap 521 is fixed to the peripheral wall surface 511.

[0085] In this way, after closing the opening 2 with the lid-forming flap 521, the cardboard box 1 can be closed only by pushing the insertion piece 525 inward with a finger.

[0086] Due to the variations in the shapes of the insertion piece 525 of the covering piece 523 and the cut 515 formed by the long side and both oblique sides of the trapezoid on the peripheral wall surface 511, various lid-closing structures (locking mechanisms) can be achieved.

[0087] When opening the lid-forming flap 521, pinch the portion 529 with a finger and pull it forward (the front side of the covering piece 523). When the broken lines 528L and 528R are broken, the lid can be opened without pulling out the insertion piece 525.

[0088] As a developed view of the cardboard box 1, since no new protruding parts or additional items are added, the conventional paper mold can be used as it is, and it can function only by processing "holes" and "cuts".

[0089] In addition, in the application example of the embodiment shown in Fig. 4, the cut 515 on the peripheral wall surface 511 is used as the insertion part into which the wing part 527 of the insertion piece 525 is inserted. However, as the insertion part, a hole having a shape close to the cut 515 may be formed on the peripheral wall surface 511.

[0090] Also, the shapes of the insertion piece 525 and the cut 515 are not limited to the shapes shown in Fig. 4, and various shapes such as an ellipse, a square, and a trapezoid are applicable.

[0091] <Configuration and Effects of Application Examples of Embodiments> Summarizing the configuration and effects of the application examples of the embodiment, the lid closing structure of the application example of the embodiment forms a box-shaped peripheral surface with plate-shaped portions (peripheral wall surfaces 511, 12 to 14) surrounding a space, forms an opening 2 inside one side of the peripheral surface, and extends a flap on a part (peripheral wall surface 12) of one side of the peripheral surface to form a lid-forming flap 521. In the box (corrugated box), the lid-forming flap 521 has a lid surface 522 that closes the opening 2, and a covering piece 523 that covers at least a part of the outside of the peripheral surface when the lid surface 522 closes the opening 2. A cut 515 or a hole is formed in the peripheral surface, and an insertion piece 525 formed by a cut is formed on the covering piece 523. When closing the lid-forming flap 521, at least a part of the outside of the peripheral surface is covered with the covering piece 523, and the insertion piece 525 is folded toward the inside of the box, so that the insertion piece 525 is inserted into and engaged with the cut 515 or the hole in the peripheral surface, and the lid-forming flap 521 is fixed to the peripheral surface. This is the feature.

[0092] Due to having such a configuration, the lid closing structure of the application example of the embodiment has the same effects as the lid closing structure of the first embodiment shown in FIGS. 1 and 2(a). When opening the lid-forming flap 521, when the portion 529 breaks the break lines 528L and 528R, the lid can be opened without pulling out the insertion piece 525, so that further convenience can be provided to the user.

[0093] The structure, connection of each member, chemical substances, etc. of the present invention can be variously changed without changing the gist of the present invention.

[0094] For example, as the material for forming the box, materials other than corrugated cardboard, such as paper other than corrugated cardboard, plastic, FRP, wood, etc. can be freely selected. As the shape of the box, shapes other than rectangular boxes, such as round boxes, triangular boxes, etc. can be variously applied.

[0095] For example, it is possible to combine two or more members into one, or conversely, to configure and connect one member from two or more other members.

[0096] Also, the above embodiments are merely the best or nearly the best forms currently available, and there are only four of them.

Explanation of Reference Numerals

[0097] Single - wall cardboard box Two openings Three bottom surfaces Index finger Peripheral wall surfaces 11 - 14 Trapezoidal hole Flap Flap Cover - forming flap Cover surface Covering piece Folding line Insertion piece Connection part Wing part Single - wall cardboard box Box body Cover Opening Bottom surface Peripheral wall surfaces 211 - 214 Trapezoidal hole Cover surface Opening Peripheral wall surfaces 311 - 314 Insertion piece Connection part Wing part

Claims

1. In a box having a plate-shaped portion surrounding a space to form a box-shaped peripheral surface, an opening is formed inside one side of the peripheral surface, and a flap is extended to a part of one side of the peripheral surface to form a lid-forming flap, the lid-forming flap has a lid surface for closing the opening and a covering piece for covering at least a part of the outside of the peripheral surface when the lid surface closes the opening, a hole or a cut is formed in the peripheral surface, an insertion piece formed by a cut is formed in the covering piece, when closing the lid-forming flap, at least a part of the outside of the peripheral surface is covered with the covering piece, and the insertion piece is folded toward the inside of the box, so that the insertion piece is inserted into and engaged with the hole or the cut in the peripheral surface to fix the lid-forming flap to the peripheral surface. A lid closing structure characterized by this.

2. A box body having a plate-shaped portion surrounding a space to form a first peripheral surface, an opening is formed inside one side of the first peripheral surface, and a closing surface is formed on the other side of the first peripheral surface, a lid body having a plate-shaped portion surrounding the first peripheral surface of the box body in a state of being attached to the box body to form a second peripheral surface, an opening into which one side of the first peripheral surface of the box body is inserted is formed inside one side of the second peripheral surface, and a closing surface for closing the opening of the box body is formed in a state of being attached to the box body, In a box comprising: a hole or a cut is formed in the first peripheral surface of the box body, an insertion piece formed by a cut is formed in the second peripheral surface of the lid body, when closing the lid body on the box body, the first side of the box body is inserted into the opening of the lid body, and the insertion piece is folded toward the inside of the box body, so that the insertion piece is inserted into and engaged with the hole or the cut in the first peripheral surface of the box body to fix the lid body to the box body. A lid closing structure characterized by this.

3. The lid closing structure according to claim 2, wherein the insertion piece is formed of a connection portion on the proximal end side connected to the second peripheral surface of the lid body and a wing portion having a portion larger than the connection portion.

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