JP2001018952A - Corrugated cardboard box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relatively simply structured corrugate cardboard box which offers the most suitable closing lock force. SOLUTION: This relates to a corrugated cardboard box 1. Each right and left pair inside flap 26, 28 is provided with a pair of right and left slits 29 corresponding to a pair of front and back outside flaps 25, 27. The outside flaps 25, 27 are provided with a pair of right and left fitting pieces 30 to be inserted and fitted in the slits 29 corresponding when the outside flaps 25, 27 are folded on the flaps 26, 28. The fitting pieces 30 are provided with a hook part 33 having a draw-in gradient (a tapered face) for the slits 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cardboard box for packaging, and more particularly to a structure of a cardboard box capable of improving the lock strength of a lid closed by a flap.

[0002]

2. Description of the Related Art Today, cardboard boxes that are light and easy to recycle are often used to protect and transport various commodities. FIG. 11 shows an example of a conventional cardboard box. FIG.
One corrugated cardboard box 51 is of a rectangular tube type, has flaps (54a, 54b) integrally with the side plate 53 of the body 52, and the flaps (54a, 54b) are border lines with the side plate 53. This is a structure that is folded at a portion 55 and used as an upper lid or a bottom lid. The flaps include a pair of left and right inner flaps 54a, 54a and a pair of front and rear outer flaps 54a.
b and 54b form an upper or bottom lid.

A pair of left and right inner flaps 54a, 54a are elongated in the left and right direction at positions corresponding to the pair of front and rear outer flaps 54b, 54b.
A pair of left and right slits 57 each penetrating therethrough are provided. On the other hand, when the outer flaps 54b, 54b are folded over the pair of left and right inner flaps 54a, 54a, the pair of left and right outer flaps 54b, 54b are inserted and engaged with the pair of left and right slits 57, respectively. A pair of engagement pieces 58 are provided. The engagement piece 58
Are formed with substantially the same width from the root to the tip.
Therefore, in the inserted state, the device is simply inserted, and there is no particular means for positively engaging and stopping the device in the removal direction.

Next, the operation of closing the flaps (54a, 54b) and forming the upper lid in the conventional cardboard box 51 will be described. First, the pair of left and right inner flaps 54a, 54a are bent inward to a position substantially perpendicular to the side plate 53 at the ruled line 55, and the pair of left and right inner flaps 54a, 54a are folded together. Then, the pair of left and right inner flaps 5
4a, 54a, a pair of front and rear outer flaps 54b, 5
4b is bent inward at the portion of the ruled line 55 so that the pair of front and rear outer flaps 54b, 54b abut each other. In addition, the outer flaps 54b, 54b
When folding the outer flaps 54b, 54
b, while bending a part of the engagement piece 58,
Insert into 7. Further, the engagement piece 58 inserted and engaged in the slit 57 in this manner is prevented from coming off by the return force due to the bending. Thus, the folded state of the flaps 54a and 54b is maintained, and this serves as a lid. FIG.
1 shows a state in which the outer flap 54b on one side of the pair of front and rear outer flaps 54b, 54b has already been folded by inserting the engagement piece 58 into the slit 57, and the outer flap 54b on the other side has not been folded. ing.

[0005]

However, in the structure of the conventional cardboard box, the force by which the engaging piece 58 is inserted into and held in the slit 57 depends on the bending force of the engaging piece 58. For this reason, there were the following problems. First
In addition, since the insertion state is held by the bending force of the engagement piece 58, the holding force is limited, and each of the flaps 54a, 54
When a force in the opening direction is applied to the inner side or the outer side by receiving a shock to the inner side or the outer side, the engaging piece 58 is easily pulled out of the slit 57,
Poor holding force (locking force). For this reason, the outer flap 54
It is necessary to use a means such as a tape extending over the boundary between the outer flap 54b and the outer flap 54b to assist, and the workability is poor and the cost is increased. Second,
Due to holding by bending, deterioration is remarkable by repetition,
Repetition was limited. In addition, in the case where a tape seal is used in combination to compensate for a decrease in the holding force due to deterioration, a trace of peeling off the tape remains, the appearance is reduced, and the reuse is restricted.

The present invention has been made in view of the above background. An object of the present invention is to provide a cardboard box which has a relatively simple structure and an optimum closed locking force can be obtained by eliminating the above problems. Still other objects will be sequentially clarified in the contents described below.

[0007]

In order to achieve the above object, according to the present invention, a pair of left and right inner flaps and a pair of front and rear outer flaps are integrally formed on one end of a body formed in a rectangular tube shape. The pair of left and right inner flaps is folded so as to abut each other, and the pair of front and rear outer flaps is folded from above, and an opening at one end side of the body is closed by the inner flap and the outer flap. In the cardboard box, the left and right inner flaps are provided with a pair of left and right slits corresponding to the pair of front and rear outer flaps, and the pair of front and rear outer flaps is provided with the pair of left and right inner flaps. Forming a pair of left and right engagement pieces that are respectively inserted and engaged with the corresponding slits when folded up, and the engagement pieces are drawn inward of the slits; Force has a catch portion with invocation gradient is generated, in which a structure.

According to this configuration, since the engaging piece is provided with the catching portion having the attraction gradient, when the engaging piece is inserted into the slit, it is guided by the attraction gradient and securely inserted to a predetermined position. be able to. Thus, it is possible to eliminate a problem that the insertion is incomplete and the engagement strength does not reach the design value. In addition, when the inner and outer flaps try to rotate inward or outward, the inner surface of the slit comes into pressure contact with the hooked portion as the inner and outer flaps rotate, and the engaging piece is hard to come off from the slit. Locking force (retaining force)
Is obtained. Furthermore, since the bending force of the flap is not used, deterioration due to repetition is less likely to occur, and the retaining force does not decrease even after repeated use.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment,
Although it is a preferred specific example of the present invention and has various technically preferred limitations, it does not limit the technical scope of the present invention.

(First Embodiment) FIGS. 1 to 3 show a cardboard box according to a first embodiment of the present invention. FIG. 1 is an external perspective view showing a state in which the upper lid is being closed. 2 is a perspective view showing a state in which a part of the cardboard box in FIG. 1 is cut away and the product is stored, and FIG. 3 is a developed view of the cardboard box shown in FIGS. 1 and 2. In FIG. 1 to FIG. 3, a cardboard box 1 is an integrated product formed by press molding, and is sequentially connected via three ruled lines 2, 3, 4 that are easily bent. It has two side surfaces 6, a third side surface 7 and a fourth side surface 8, and a margin 10 connected to a side end of the first side surface 5 through a ruled line 9 which is also easily bent. Have. Then, the side portions 5, 6, 7, 8 and the margin 10 are connected to the ruled lines 2, 3,
By valley-folding at 4 and 9 and fixing the glue margin 10 to the inner surface of the fourth side surface portion 8 by gluing or the like, a body portion 11 having a rectangular solid rectangular tube shape is formed as shown in FIGS. Is done.

As shown on the right side of FIG. 3, the lower end of each of the side portions 5, 6, 7, and 8 has first and second ruled lines 12, 13, 14, and 15 which are easily bent. A lower surface flap 16, a second lower surface flap 17, a third lower surface flap 18, and a fourth lower surface flap 19 are provided. Of these lower flaps 16, 17, 18, 19, the lower flaps 17, 19 form left and right lower inner flaps, and the lower flaps 16, 18 form front and rear lower outer flaps. Then, the ruled lines 13 and 15 are arranged such that the pair of left and right inner flaps 17 and 19 abut each other.
Is bent inward by approximately 90 degrees at the portion, and a pair of lower outer flaps 16 and 18 from front and rear are respectively ruled from above on the ruled line 1
2 and 14, the inside of each lower outer flap 16, 18
When folded so that comrades can butt each other, the torso 1
The opening on the lower surface side of 1 can be closed. Further, in this embodiment, after the opening on the lower surface side of the body portion 11 is closed by the lower surface flaps 16, 17, 18, and 19 in this manner, the opening is sealed with an adhesive or a fastener, an adhesive tape, or the like. Locked.

On the other hand, as shown on the left side of FIG. 3, the upper ends of the side surfaces 5, 6, 7, and 8 are provided with first and second ruled lines 21, 22, 23, and 24 which are easily bent. The upper surface flap 25, the second upper surface flap 26, the third upper surface flap 27, and the fourth upper surface flap 28 are connected. Of these upper flaps 25, 26, 27, 28, the upper flaps 26, 28 form left and right upper inner flaps, and the upper flaps 25, 27 form front and rear upper outer flaps. Therefore, in the following description, the upper surface flap 2
6 and 28 are referred to as inner flaps 26 and 28, respectively, and the top flaps 25 and 27 are referred to as outer flaps 25 and 27, respectively.

A further explanation will be given. A pair of left and right inner flaps 2
A pair of left and right slits 29 is provided in each of the positions 6 and 28 at positions corresponding to the pair of front and rear outer flaps 25 and 27 so as to be elongated in the left and right direction.

On the other hand, a pair of front and rear outer flaps 2
5 and 27 have a pair of left and right engagement pieces 30 that can be inserted and engaged with a pair of left and right slits 29 when the outer flaps 25 and 27 are folded over the pair of left and right inner flaps 26 and 28, respectively. It is provided and has a pressing piece 31 provided between a pair of left and right engaging pieces 30. Further, the engaging piece 30 is not formed with the same size from the root portion to the tip portion, and a substantially middle portion on one side of the engaging piece 30 has a maximum protrusion amount S2 (see FIG. 3). An engaging portion 33 is provided. This catching portion 33 is provided on one edge of the engagement piece 30 (the inner flap 2).
6 and 28 are provided in a state where tapered surfaces 32a and 32b for the inclining gradient are attached along the folded state (the edge located on the border side between the flaps). The tapered surface 32 a is formed at one side edge of the engagement piece 30, and is formed so as to gradually increase the width of the engagement piece 30 from the distal end to almost halfway of the engagement piece 30. On the other hand, the tapered surface 32b is located on one side edge of the engagement piece 30 and extends from the vertex of the tapered surface 32a to the vicinity of the root of the engagement piece 30.
0 is formed so as to gradually narrow the width, and has a steeper gradient than the tapered surface 30a. The other side of the engaging piece 30 (the side opposite to the hooking portion 33) is slightly cut from the tip of the engaging piece 30 to the vicinity of the root thereof, and the linear cutouts 30a correspond to the outer flaps 25 and 27. It is a step inside from the line where it does. Note that the relationship between the engagement piece 30 and the slit 29 is such that when the engagement piece 30 is inserted into the slit 29 up to a substantially root portion, only the portion indicated by reference numeral S2 in FIG. , 28 are substantially equal to the minimum width S5 between the left and right slits 29 and the maximum width S1 ( 3) is formed substantially equal to or smaller than the left and right width S3 of the slit 29. Further, the engagement piece 30 is inserted into the slit 29 up to the root portion in the engagement piece 30, and the hooking portion 33 is attached to the inner flaps 26 and 2.
In the state where the hook 8 is engaged with the hook 8, a play corresponding to the cutout portion 30 a is provided on the opposite side of the hook portion 33. Further, the outer flaps 25 and 27 are provided with ruled lines 34 which are formed in a substantially intermediate portion between the respective engagement pieces 30 and the corresponding ruled lines 21 and 23 and which are processed to be easily bent in a state extending in the left-right direction.

Next, an operation (work procedure) of closing the upper surface of the body 11 by closing the flaps 25, 26, 27, 28 will be described. The flaps 25, 26, 27, 28
The lower side of the body 11 is the lower flaps 16, 17, 18, 19
Then, as shown in FIG. 2, the cushion 35 and the product 36 are put in the body 11 and then closed. Then, first, the pair of left and right inner flaps 26 and 28 are
The inner side flaps 26 and 28 are folded inward at positions 2 and 24 to a position substantially perpendicular to the second side surface portion 6 and the fourth side surface portion 8, respectively.

Next, a pair of front and rear outer flaps 25, 2 are placed on the folded left and right inner flaps 26, 28 from above.
7 is bent inward at the portions of the ruled lines 21 and 23, and at the time of this bending, as shown in FIG.
The pair of front and rear outer flaps 25 and 27 are folded in half at the ruled line 34 so that the engagement piece 30 can be inserted into the slit 29.

Subsequently, as shown in FIG. 5, the engaging piece 30 is inserted into the slit 29 while raising the ruled line 34. When the engagement piece 30 is inserted, the engagement piece 30 is provided with a hook portion 33, and the front and rear side surfaces of the hook portion 33 are formed by tapered surfaces 32a and 32b, and the tapered surfaces 32a and 32b are formed. When the engagement piece 30 is inserted into the slit 29, the tapered surface 32a first comes into contact with the inner surface of the slit 29, and when the engagement piece 30 is further pushed in, the tapered surface 32 is formed.
a is pressed into the corresponding edge of the slit 29, and at the same time, the tapered surface 32b engages with the corresponding edge of the slit 29. In this engagement process, a force that is pulled inward, that is, inward of the slit 29, is generated by the tapered shape of the tapered surface 32b and is attracted, and can be easily and reliably inserted almost to the final position. When inserted, as shown in FIG.
3 protrudes from the corresponding inner flaps 26, 28 on the rear surface side and is engaged and closed and locked.

When the flaps (25 to 28) try to rotate inward or outward due to an impact or the like, the engagement piece 30 locked and locked in this manner is moved toward the catching portion 33 with the rotation. Since the inner surface of the slit 29 is brought into pressure contact with the slit 29, the engagement force is strengthened, and a reliable locking force is obtained.This will be further described with reference to FIGS. There is an allowance (play) between the inner surface 29a of the end portion and the hook portion 33. The product 36 protected by the cushion material 35
When the force B is applied from the side, the force C is applied via the cushion material 35.
Works to push up the inner flaps 26 and 28. Then
The inner flaps 26 and 28 bend, and the catching portion 33 and the inner surface 29a of the end of the slit 29 come into contact with each other. 33
And the end inner surface 29a are converted into directions in which they abut each other. As a result, the locking force is increased, and the engagement piece 30 is prevented from coming out of the slit 29.

Therefore, in the structure of the cardboard box 1 according to the first embodiment, the engaging piece 30 is provided with the catching portion 33 having the attraction gradient (tapered surfaces 32a, 32b). When it is inserted into the device, it can be smoothly inserted to a predetermined position by being guided by the attraction gradient (tapered surface 32a). Thus, it is possible to eliminate a problem that the insertion is incomplete and the engagement strength does not reach the design value. Also,
Since the catching portion 33 has the notched portion and the notch portion 30a formed by the tapered surfaces 32a and 32b, when the flaps 25, 26, 27 and 28 try to rotate inward or outward, the catching portion 33 catches with the rotation. The inner surface of the slit 29 is brought into pressure contact with the portion 33, and a reliable locking force is obtained. Further, in this structure, a bending force is not used as in the related art, so that deterioration due to repetition is reduced, and a strong closing lock force is maintained even after repeated use.

(Second Embodiment) Next, a cardboard box according to a second embodiment of the present invention will be described with reference to FIGS. The configuration of the second embodiment is such that the pressing piece 31 of the cardboard box 1 having the configuration shown in FIGS. 1 to 8 is eliminated, and a ruled line 34 formed so as to be easily bent is provided at the base of the engaging piece 30. Since other configurations are the same as those in FIGS. 1 to 8, the same members and portions will be described with the same reference numerals. 9 and FIG.
When the inner flaps 26 and 28 are folded inward and then the outer flaps 25 and 27 are folded from above and the engagement piece 30 is inserted into the slit 29, the ruled line 34 is once bent to prepare for insertion. Then, the engagement piece 30 is inserted into the slit 29 in the manner described above.

Therefore, in the cardboard box 1 of this embodiment, when the outer flaps 26 and 28 are bent at the ruled lines 34 before the engagement pieces 30 are inserted into the slits 29, only the roots of the engagement pieces 30 are bent. Since it suffices to be bent, the bending is simplified. After the insertion, the catch 33 is engaged with the inner surface of the end of the slit 29 and is securely closed and locked in the same manner as in the structure of the first embodiment.

In each of the above embodiments, the case where the structure of the present invention is applied only to the upper flaps (25, 26, 27, 28) has been described.
6, 17, 18, 19) may have the same structure as the upper surface side. In the present invention, the shapes of the slit 29 and the engagement piece 30 can be modified based on this.

[0023]

As described above, in the cardboard box of the present invention, as is apparent from the above-described embodiment, the engaging piece is provided with the catching portion having the attraction gradient. At the time of insertion, it can be reliably inserted to a predetermined position by being guided by the inlet gradient, so that problems such as incomplete insertion and the engagement strength not reaching the design value can be eliminated, and at the same time, the outer flap Is rotated inward or outward, the hooked portion comes into pressure contact with the corresponding inner surface of the slit with the rotation, and a reliable locking force is obtained. Furthermore, since a bending force is not used as in the prior art, there is an effect that there is no deterioration due to repetition, and a strong closing lock force can be obtained even after repeated use.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a cardboard box according to a first embodiment of the present invention as viewed in a state where an upper cover is being closed.

FIG. 2 is a perspective view showing a state in which a part of the cardboard box in FIG.

FIG. 3 is a schematic development view of the cardboard box shown in FIGS. 1 and 2;

FIG. 4 is a diagram illustrating a closing operation of an upper lid of a cardboard box according to the first embodiment.

FIG. 5 is a diagram illustrating the closing operation of the upper cover of the cardboard box according to the first embodiment.

FIG. 6 is a view for explaining the closing operation of the upper lid of the cardboard box according to the first embodiment.

FIG. 7 is a diagram illustrating an operation of a main part of the first embodiment.

FIG. 8 is an enlarged view of a portion A in FIG. 7;

FIG. 9 is an external perspective view of a cardboard box according to a second embodiment of the present invention as viewed while the upper lid is being closed.

FIG. 10 is a schematic development view of the cardboard box of FIG. 9;

FIG. 11 is a perspective view showing a conventional example of a cardboard box.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cardboard box, 11 ... Trunk, 12, 13, 14, 15
... Ruled line, 16 ... 1st lower surface flap (outer flap), 17
... 2nd lower surface flap (inner flap), 18 ... 3rd lower surface flap (outer flap), 19 ... 4th lower surface flap (inner flap), 21, 22, 23, 24 ... ruled line, 25 ... first
Upper surface flap (outer flap), 26: second upper surface flap (inner flap), 27 ... third upper surface flap (outer flap), 28 ... fourth upper surface flap (inner flap), 29 ...
Slit, 30 ... engaging piece, 31 ... holding piece, 32a, 3
2b: tapered surface (attraction gradient), 33: hooked portion, 34: ruled line.

Claims (5)

[Claims] 1. A pair of left and right inner flaps and a pair of front and rear outer flaps are provided integrally with the body at one end side of a body formed in the shape of a rectangular tube. In the corrugated cardboard box, the pair of front and rear outer flaps are folded from above and the opening at one end side of the body is closed by the inner flap and the outer flap. A pair of left and right slits are provided corresponding to the pair of front and rear outer flaps, and each of the pair of front and rear outer flaps is inserted into the corresponding slit when the outer flap is folded over the pair of left and right inner flaps. A pair of left and right engaging pieces to be engaged, wherein the engaging pieces have a catching gradient in which a pulling force is generated toward the inside of the slit; Cardboard box, wherein has, that. 2. The pair of front and rear outer flaps straddle the pair of left and right inner flaps between the pair of left and right engaging pieces when the outer flaps are folded over the corresponding inner flaps. The cardboard box according to claim 1, further comprising a pressing piece for pressing a boundary portion between both inner flaps from above. 3. The outer flap is provided with a ruled line for mountain-folding a portion of the engagement piece when inserting and engaging the engagement piece into the slit.
Cardboard box as described in. 4. The engaging piece is provided with a ruled line along a root of the engaging piece for mountain-folding a portion of the engaging piece when the engaging piece is inserted into the slit and engaged. The cardboard box according to claim 1 or 2, wherein 5. A leading end taper surface which is provided along one side edge of the engaging piece and gradually increases the width of the engaging piece from the distal end to almost halfway of the engaging piece. 5. A base tapered surface which gradually narrows the width of the engagement piece from the top of the side tapered surface to the vicinity of the base of the engagement piece.
A cardboard box according to any one of the above.