JP7639602B2 - Packaging box and opening/closing seal structure of packaging box - Google Patents

Description

The present invention relates to a packaging box and a structure for opening and closing the packaging box.

A packaging box of the B-type bottom assembly type having a locking piece protruding from the upper edge of one of the side panels is known and is described in Patent Document 1. This type of packaging box is a type that can prevent the top lid from opening by inserting the locking piece into an insertion hole formed in the edge of the top lid, and is widely used.

The packaging box described in Patent Document 1 further has a second locking piece connected to the tip of the locking piece. When the second locking piece is folded over and inserted into the insertion hole to close the box, the second locking piece opens inside the box and gets caught on the side panel, preventing the locking piece from coming out.
As a result, the packaging box described in Patent Document 1 cannot be opened in any way other than by cutting off a portion of the top lid, making it impossible to tamper with the packaging box.

Patent No. 4238650

The packaging box described in Patent Document 1 cannot be opened once it has been closed without cutting out a part of the packaging box, which places a heavy burden on manufacturers as the packaging box cannot be reused. Therefore, there is a demand for a packaging box and an opening/closing structure for the packaging box that can be resealed even after opening while preventing unauthorized opening.

The problem that the present invention aims to solve is to provide a packaging box and an opening/closing structure for the packaging box that can prevent unauthorized opening and can be resealed even if opened.

In order to solve the above problems, the present invention has the following configurations 1) and 2).
1) A device comprising a main body box and a hook portion;
The main body box includes:
First to fourth side plates forming a rectangular tube;
a cover plate having an opening through which a part of the hook portion can pass, the cover plate being connected to an upper edge of the first side plate and being bent to close an upper opening of the rectangular cylinder;
An insertion piece that is connected to the tip edge of the cover plate and can be folded in half;
A raised portion formed on the insertion piece and capable of being bent inward;
a lock piece including a lock piece base portion formed on an upper edge portion of a third side plate facing the first side plate and capable of being folded outward in a valley direction, an insertion portion connected to a tip of the lock piece base portion and capable of being folded in a mountain direction, and a fold-back portion connected to a tip of the insertion portion and capable of being folded in a mountain direction;
having
With the rising portion folded inwardly of the rectangular tubular body and the locking piece folded outwardly, the cover plate is closed by folding the insertion piece inwardly of the third side plate, and the locking piece is inserted into the third side plate while being folded inwardly of the third side plate. The locking piece is folded inwardly so that the folded back portion overlaps the inserted portion, and is inserted into the opening obtained by folding the rising portion inwardly. The folded back portion naturally returns to its original folding position, thereby making it impossible for the locking piece to be folded outward again.
In the closed state, a passage is formed between the opening and the folded-back portion, allowing the entry of a long plate-like member ,
The hook portion is a packaging box having a shelf extending from the opening toward the folded portion .
2) A structure for opening and closing a packaging box, in which a packaging box having a main box and a hook portion and closed is opened using a long plate-shaped opening tool,
The main body box includes:
First to fourth side plates forming a rectangular tube;
a cover plate having an opening through which a part of the hook portion can pass, the cover plate being connected to an upper edge of the first side plate and being bent to close an upper opening of the rectangular cylinder;
An insertion piece that is connected to the tip edge of the cover plate and can be folded in half;
A raised portion formed on the insertion piece and capable of being bent inward;
a lock piece including a lock piece base portion formed on an upper edge portion of a third side plate facing the first side plate and capable of being folded outward in a valley direction, an insertion portion connected to a tip of the lock piece base portion and capable of being folded in a mountain direction, and a fold-back portion connected to a tip of the insertion portion and capable of being folded in a mountain direction;
having
With the rising portion folded inwardly of the rectangular tubular body and the locking piece folded outwardly, the cover plate is closed by folding the insertion piece inwardly of the third side plate, and the locking piece is inserted into the third side plate while being folded inwardly of the third side plate. The locking piece is folded inwardly so that the folded-back portion overlaps the inserted piece, and is inserted into the opening obtained by folding the rising portion inwardly. The folded-back portion naturally returns to its original folding position, thereby making it impossible for the locking piece to be folded outward again.
The opening tool is inserted through the opening to re-fold the folded-back portion that has naturally returned to its original state,
The hook portion has a shelf plate extending from the opening toward the folded portion and guiding the opening tool inserted from the opening.
This is the structure for opening and closing the packaging box.

According to one aspect of the present invention, it is possible to obtain the effect of preventing unauthorized opening and being able to reseal even if opened.

FIG. 1 is a plan view of a first half 1A of a main box 1 constituting a packaging box 91 which is an example of a packaging box according to an embodiment of the present invention. FIG. 2 is a plan view of the second half 1B of the main box 1. FIG. FIG. 3 is a development view of the hook portion 3 constituting the packaging box 91. As shown in FIG. FIG. 4 is a perspective view showing the configuration of the packaging box 91. As shown in FIG. FIG. 5 is a first diagram showing a procedure for assembling the packaging box 91. As shown in FIG. FIG. 6 is a second diagram showing the procedure for assembling the packaging box 91. As shown in FIG. FIG. 7 is a perspective view showing the packaging box 91 in a closed state. FIG. 8 is a cross-sectional view taken along the line S8-S8 in FIG. FIG. 9 is an enlarged view of part A in FIG. FIG. 10 is an enlarged view of part B in FIG. FIG. 11 is a plan view showing an opening jig 71 used when opening the packaging box 91. As shown in FIG. FIG. 12 is a first diagram showing a procedure for opening a closed packaging box 91 using an opening tool 71. FIG. 13 is a second diagram showing the procedure for opening the closed packaging box 91 using the opening tool 71. FIG. 14 is a third diagram showing the procedure for opening the closed packaging box 91 using the opening tool 71. FIG. 15 is a development view of a hook portion 5 which is a modification of the hook portion 3. As shown in FIG. FIG. 16 is a perspective view of the hook portion 5 in use. FIG. 17 is an enlarged view of a portion of a packaging box 91A of a modified example using a hook portion 5, which corresponds to portion A in FIG. FIG. 18 is an enlarged view of a portion of the packaging box 91A corresponding to portion B in FIG. FIG. 19 is a first diagram showing the procedure for opening the packaging box 91A. FIG. 20 is a second diagram showing the procedure for opening the packaging box 91A. FIG. 21 is a perspective view showing an operation of opening a packaging box 91 using an opening jig 71A which is a first modified example of the opening jig 71. As shown in FIG. FIG. 22 is a perspective view showing an operation of opening the packaging box 91 using an opening jig 71B which is the second modified example of the opening jig 71. As shown in FIG.

The packaging box and the opening/closing sealing structure of the packaging box according to the embodiment of the present invention will be described with reference to an example packaging box 91 and its opening/closing sealing structure 91K. As shown in FIG. 7, the packaging box 91 is composed of a main box 1 and a hook portion 3.
The main box 1 is configured by connecting a first half 1A and a second half 1B.
Fig. 1 is a development view of the first half 1A, and Fig. 2 is a development view of the second half 1B. Fig. 3 is a development view of the hook portion 3. For ease of explanation, the up, down, left and right directions are defined by the directions of the arrows shown in each figure.
The first half 1A, the second half 1B and the hook portion 3 are formed from corrugated cardboard or paperboard.

As shown in FIG. 1, the first half 1A has a first side plate 11, a second side plate 12, a first overlap portion 111, a part of the bottom assembly portion 15, a cover plate 16, and a first side flap 17.
A first overlap portion 111 extends from the left side of the first side plate 11 via a mountain fold m1.
The first side plate 11 and the second side plate 12 on the right side are connected via a mountain fold m2.
The bottom assembly 15 has a first bottom plate 151 connected below the first side plate 11 via a mountain fold m3, and a second bottom plate 152 connected below the second side plate 12 via a mountain fold m4.

The cover plate 16 is connected to the upper side of the first side plate 11 via a mountain crease m5, and the first side flap 17 is connected to the upper side of the second side plate 12 via a mountain crease m6.
The cover plate 16 has a slit 16a extending laterally in the center.
The cover plate 16 has an insertion piece 161 connected to its upper edge via a crease m7.
More specifically, the left and right ends of the insertion piece 161 are connected to the upper edge of the cover plate 16 via mountain folds m7a, m7b, and the central portion is separated from the cover plate 16 by a notch 163 formed therein.
The upper left and right ends of the insertion piece 161 are connected via mountain creases m8a and m8b at the left-right center of the cutout portion 163, and the other portion is cut and separated to form a concave-shaped raised portion 162. In other words, the raised portion 162 can be bent toward the inside of the main box 1 from the mountain creases m8a and m8b.

The first side flap 17 has a slit 17a cut downward from the center of the left and right sides of the upper edge. When the first side flap 17 is folded inward to close the cover plate 16 when the main box 1 is closed, the slit 17a overlaps with the slit 16a to form a communication hole.

As shown in FIG. 2, the second half 1B has a third side plate 13, a fourth side plate 14, a second overlap portion 131, a part of the bottom assembly portion 15, an inner flap 18, and a second side flap 19.
A second overlap portion 131 extends from the left side of the third side plate 13 via a mountain fold m9.
The third side plate 13 and the fourth side plate 14 on the right side are connected via a mountain fold m10.
The bottom assembly 15 has a third bottom plate 153 connected below the third side plate 13 via a mountain fold m11, and a fourth bottom plate 154 connected below the fourth side plate 14 via a mountain fold m12.

The inner flap 18 is connected to the upper side of the third side panel 13 via a mountain crease m13, and the second side flap 19 is connected to the upper side of the fourth side panel 14 via a mountain crease m14.
The inner flap 18 has a slit 18a extending left and right in the center. The mountain crease m13 is made up of mountain creases m13a and m13b separated to the left and right.
A lock piece base 181 is formed that can be bent up, spanning from the upper part of the third side panel 13 to the lower part of the inner flap 18, leaving a part connected by the valley fold mt1. Above the lock piece base 181, an insertion part 182 and a folded-back part 183 are separated from the inner flap 18 and connected in this order.

Specifically, the lock piece base 181 is formed as a rectangular portion so as to be able to be raised in a direction rising from the plane of the paper in Fig. 2 by a valley fold mt1. An insertion portion 182 is formed above the lock piece base 181 and connected thereto via a mountain fold m15a. A folded-back portion 183 is formed above the insertion portion 182 and connected thereto via a mountain fold m15b.
A notch 184 is formed at the edge connecting the third side panel 13 and the inner flap 18, spanning the opening obtained by bending the lock piece base 181. The insertion piece 161 of the first half 1A can be inserted into the notch 184.
The connected lock piece base portion 181, the insertion portion 182, and the folded portion 183 constitute the lock piece 18L.

The second side flap 19 has a slit 19a cut downward from the center of the left and right sides of the upper edge. When the second side flap 19 is folded inward to close the cover plate 16 when the main box 1 is closed, the slit 19a overlaps with the slit 16a to form a communication hole.

As shown in FIG. 3, the hook portion 3 is formed in a shape symmetrical up and down with respect to the mountain fold m31.
The hook portion 3 has a first hook base 31 and a second hook base 32 which are identical in shape and connected by a mountain fold m31.
The first hook base 31 has a hook hole 31a extending laterally at the vertical center, and a hook portion 31b carved into the hook hole 31a at the horizontal center on the side of the mountain crease m31.

A first shoulder 314 and a second shoulder 315 are formed on the left and right ends of the lower part of the first hook base 31, protruding leftward and rightward, respectively.
A rectangular notch 312 is formed in the center of the lower edge of the first hook base 31 toward the hook hole 31a.
On both the left and right sides of the notch 312, a first flange 311 and a second flange 313 are formed by the notches 31c and 31d formed in the first hook base 31, and are foldably connected to the first hook base 31 via valley folds mt2a and mt2b.

The second hook base 32 has a hook hole 32a extending left and right formed in the vertical center, and a hook portion 32b carved into the left and right center of the hook hole 32a on the side of the mountain crease m31.
A third shoulder 324 and a fourth shoulder 325 are formed on the left and right ends of the upper part of the second hook base 32, protruding leftward and rightward, respectively.
The second hook base 32 has an upper edge at its center portion cut into a rectangular shape to form a notch 322 extending toward the hook hole 32a.
On both the left and right sides of the notch 322, a third flange 321 and a fourth flange 323 are formed by the notches 32c and 32d formed in the second hook base 32, and are foldably connected to the second hook base 32 via valley folds mt3a and mt3b.

The first half 1A and the second half 1B are attached by gluing the first overlap portion 111 of the first half 1A to the inside of the right edge of the fourth side plate 14 of the second half 1B, and gluing the second overlap portion 131 of the second half 1B to the inside of the right edge of the second side plate 12 of the first half 1A. This forms a rectangular cylinder from the first side plate 11 to the fourth side plate 14. The cover plate 16 is a member that closes the upper opening of this rectangular cylinder. The first side plate 11 and the third side plate 13 are located opposite each other.
The first to fourth bottom plates 151 to 154 are combined to form the bottom assembly 15, thereby forming the main box 1 as shown in FIG.
In addition, the hook portion 3 is folded at mountain crease m31 to overlap the first hook base 31 and the second hook base 32, and the first flange 311 and the second flange 313, and the third flange 321 and the fourth flange 323 are folded in a valley fold at approximately right angles to the overlapping first hook base 31 and second hook base 32, to be in a usable form.

As shown in Figures 4 and 5, the packaging box 91 is assembled by opening the cover plate 16, the first side flap 17, the second side flap 19, and the inner flap 18 of the main box 1 and placing the hook portion 3 above the main box 1.
First, the first side flap 17 and the second side flap 19 are folded inward so as to close the upper opening of the rectangular cylinder. At this time, the overlapping portions of the first hook base 31 and the second hook base 32 of the hook portion 3 enter the slits 17a of the first side flap 17 and the slits 19a of the second side flap 19.
The first side flap 17 is located above the first flange 311 and the third flange 321 , and the second side flap 19 is located above the second flange 313 and the fourth flange 323 .
On the other hand, the first shoulder 314 and the third shoulder 324, and the second shoulder 315 and the fourth shoulder 325 of the hook portion 3 are caught on the undersides of the first side flap 17 and the second side flap 19, respectively, and cannot be pulled out upward.

Next, as shown in Figs. 5 and 6, the inner flap 18 is closed, and then the cover plate 16 is closed.
When the inner flap 18 is closed, the first hook base 31 and the second hook base 32 of the hook portion 3 are passed through the slit 18a.
Furthermore, the lock piece base 181 is bent outwardly of the rectangular cylinder, and the cover plate 16 is closed. At this time, the first hook base 31 and the second hook base 32 are passed through the slits 16a of the cover plate 16.

The insertion piece 161 of the cover plate 16 is inserted into a notch 184 (see also FIG. 2) formed in the edge connecting the third side plate 13 and the inner flap 18. At that time, as shown in FIG. 5, the raised portion 162 is raised so that the bending angle θa is about 60°.
As a result, an opening K2 is formed in the upper part of the third side plate 13 at the center in the left-right direction, as shown in FIG.

When the cover plate 16 is closed, the insertion portion 182 is inserted into the opening K2 in a state where the folded portion 183 is folded back in a mountain fold and overlapped.
As a result, the packaging box 91 is closed as shown in FIG.

Figures 8 to 10 are diagrams showing the internal state of the closed packaging box 91. Figure 8 is a cross-sectional view taken along the line S8-S8 in Figure 7. Figure 9 is an enlarged view of part A in Figure 8, and Figure 10 is an enlarged view of part B in Figure 8.

8 and 9 , the upper end of the opening of the notch 312 of the hook portion 3 is located above the upper surface 16b of the cover plate 16. The notch 312 also communicates with the slit 18a of the inner flap 18 and the slit 16a of the cover plate 16 to form an opening K1 that spans the hook portion 3 and the cover plate 16.
As shown in Figures 8 and 10 , after entering the interior of the main box 1, the folded-back portion 183 opens so that the angle it forms with the insertion portion 182 becomes larger in an attempt to naturally return to the shape it was in before being folded, and abuts against the raised portion 162 of the cover plate 16.
10 in an attempt to open the sealed package, the folded-back portion 183 moves in the direction of the dashed arrow DR2 and comes into contact with the abutment portion 161b. Therefore, the locking piece base 181 is prohibited from being pulled out to the right, resulting in a sealed package that cannot be opened.
That is, the packaging box 91 is difficult to open in its original state, and therefore tamper-evident opening is prevented.

The packaging box 91 can be opened non-destructively using an opening tool 71 shown in FIG.
The opening jig 71 is a long thin plate member made of metal or hard resin.
The length L71 of the opening jig 71 is preferably equal to or greater than half the length L91 (see FIG. 7) in the depth direction (front-rear direction) of the packaging box 91. The width W71 is shorter (narrower) than the width W312 (see FIG. 3) of the notch 312 of the hook portion 3.

12, a person who opens the packaging box 91 inserts the opening tool 71 from the rear side of the packaging box 91 into the opening K1 that straddles the hook portion 3 and the cover plate 16 of the packaging box 91 (see arrow DR3). Then, the opening tool 71 is pushed in so that the tip portion 71a of the opening tool 71 advances along the underside 18c of the inner flap 18 as far as possible.
As shown in Figures 9 and 10, the packaging box 91 has a passage R between an opening K1 including a slit 16a through which a part of the hook portion 3 passes and the folded-back portion 183, which allows the entry of a thin plate-like member.

When the opening jig 71 is further advanced, it reaches the vicinity of the folded-back portion 183 as shown in FIG.
8, the distance in the front-rear direction between the folded-back apex 183a, which is the folded-back position of the folded-back portion 183, and the outer surface 11a of the first side plate 11 is defined as La. The distance in the front-rear direction between the tip 162a of the rising portion 162 and the outer surface 11a of the first side plate 11 is defined as Lb.

The opener further presses opening jig 71 into the area ARa of folded portion 183, indicated by the dashed dotted line from tip 162a of rising portion 162 toward folded top 183a (see arrow DR4).
As a result, the folded-back portion 183 is lifted by the opening jig 71 which is pushed in as indicated by the arrow DR5 in FIG. 14 (see the arrow DR6).
Since the folded portion 183 is raised, when the opener pulls the lock piece base 181 outward from the packaging box 91 (see arrow DR7), the folded portion 183 passes through the opening K2 (see arrow DR8), opening the inner flap 18 and the cover plate 16, thereby enabling the packaging box 91 to be opened.

As described above, the packaging box 91 and its opening/closing sealing structure 91K cannot be opened non-destructively from the state in which they are closed, but they can be opened non-destructively using the opening tool 71.
That is, the packaging box 91 is not broken, cut, or otherwise damaged when opened. Therefore, the packaging box 91 can be reused and resealed after being opened using the opening tool 71.

The embodiment described above is not limited to the configuration, and may be modified without departing from the spirit of the present invention.

FIG. 15 is a development view showing a hook portion 5 which is a modification of the hook portion 3, and FIG. 16 is a perspective view showing the hook portion 5 in use.
As shown in FIG. 15, the hook portion 5 is formed in an asymmetric shape in the up-down direction with respect to the mountain fold m51.

The hook portion 5 has a first hook base 51 and a second hook base 52 connected by a mountain fold m51.
The first hook base 51 has a hook hole 51a extending left and right at the center in the up-down direction, and a hook portion 51b hollowed out toward the mountain crease m51 at the center position in the left-right direction of the hook hole 51a.
A first shoulder 514 and a second shoulder 515 are formed on the left and right ends of the lower part of the first hook base 51, protruding leftward and rightward, respectively.

A pair of cutouts 51e, 51f extending vertically and spaced apart from each other and a pair of cutouts 51g, 51h extending horizontally form an inverted T-shaped shelf board 541 at the center of the lower edge of the first hook base 51. The upper end of the shelf board 541 in FIG. 15 is connected to the first hook base 51 by a valley fold mt52.
A rectangular opening 512 that is long in the left-right direction is formed above the valley fold mt52 in the first hook base 51.

15, arm pieces 543 and 544 are formed on the lower portion of the shelf board 541, extending leftward and rightward, respectively.
On the left and right sides of the shelf board 541, a first flange 511 and a second flange 513 are formed which are connected to the lower part of the first hook base 51 via valley folds mt5a, mt5b so as to be valley foldable.

The lower edges of the first flange 511 and the second flange 513 are formed with slits 511a and 513a, respectively, that are cut upward.
Slits 543a and 544a are formed in the arm pieces 543 and 544 at positions that are on the left and right outer sides of the slits 511a and 513a.
The arm pieces 543, 544 have valley folds mt5c, mt5d formed at the connection with the shelf board 541, and mountain folds m5a, m5b formed on the outside of these.
As a result, as shown in FIG. 16, the arm piece 543 is assembled by bending the valley fold mt5c and the mountain fold m5a in a stepped manner and engaging the slit 543a with the slit 511a.
Similarly, the arm piece 544 is assembled by bending the arm piece 544 in a step at the valley fold mt5d and the mountain fold m5b to engage the slit 544a with the slit 513a.
In this manner, the shelf board 541 is connected to the first flange 511 and the second flange 513 to maintain its posture and position.

The second hook base 52 has a hook hole 52a extending left and right in the center in the up-down direction, and a hook portion 52b hollowed out toward the mountain crease m51 in the center position in the left-right direction of the hook hole 52a.
A third shoulder 524 and a fourth shoulder 525 are formed on the left and right ends of the upper part of the second hook base 52, protruding leftward and rightward, respectively.

The center of the upper edge of the second hook base 52 is cut into a rectangular shape toward the hook hole 52a to form a notch 522. The center of the lower edge of the notch 522 is cut further downward to form a recess 522a.
Cutouts 52c and 52d are formed on both the left and right sides of the cutout 522 in the second hook base 32, forming a third flange 521 and a fourth flange 523 which are foldably connected to the second hook base 52 via valley folds mt5e and mt5f.

Using the hook portion 5 and the main box 1 of this modified example, a packaging box 91A is assembled in the same manner as the packaging box 91.
17 and 18 are views corresponding to an enlarged view of a portion A and an enlarged view of a portion B of the packaging box 91A in FIG. 8, respectively.

As shown in Figures 17 and 18, a shelf board 541 is disposed below the inner flap 18, on the forward side of the packaging box 91A from the opening K1. The shelf board 541 extends to the vicinity of the folded portion 183.

The packaging box 91A can be opened in the same manner as the packaging box 91, using an opening tool 71 shown in FIG.
19, a person who opens the packaging box 91A inserts the opening jig 71 from the rear side toward the front into the opening K1 that straddles the hook portion 5 and the cover plate 16 of the packaging box 91A. At this time, the tip portion 71a of the opening jig 71 hits the shelf plate 541, so the opener does not need to be concerned about the insertion angle of the opening jig 71, and can simply push the opening jig 71 in so that the tip portion 71a slides on the shelf plate 541.

When the opening jig 71 is further pushed in, the tip portion 71a is guided by the shelf plate 541 and reaches the vicinity of the folded portion 183, as shown in FIG.
When opening jig 71 is further pushed in (see arrow DR9), tip portion 71a guided by shelf board 541 hits folded portion 183 and pushes folded portion 183 upward (see arrow DR10).
Thereafter, in the same manner as with the packaging box 91, the packaging box 91A can be opened by removing the lock piece base portion 181.

As described above, the packaging box 91A using the hook portion 5 allows the opener to easily open the box without having to worry about the insertion angle or amount of the opening jig 71.
The packaging box 91A does not require destructive actions such as breaking or cutting when it is opened using the opening jig 71. Therefore, the packaging box 91A can be reused and resealed after being opened using the opening jig 71.

FIG. 21 is a perspective view showing an operation of opening a packaging box 91 (91A) using an opening jig 71A which is a first modified example of the opening jig 71. As shown in FIG.
The opening jig 71A has a visible mark 71Ab at a distance Lc from the tip 71Aa. The distance Lc is determined by the following equation with respect to the distances La and Lb shown in FIG.
Distance La<distance Lc<distance Lb
It is set to satisfy the following.

As a result, the opener inserts the opening tool 71A into the inside through the opening K1, aligns the mark 71Ab with the position of the outer surface 11a of the first side panel 11, and then lifts the tip 71Aa side. This causes the tip 71Aa to be lifted exactly in a position where it abuts the folded-back portion 183, allowing the folded-back portion 183 to be lifted more reliably to open the packaging box 91 (91A).

FIG. 22 is a perspective view showing an operation of opening the packaging box 91 (91A) using an opening jig 71B which is the second modified example of the opening jig 71. As shown in FIG.
The opening jig 71B has a flange 71Bb extending vertically from a tip 71Ba at a distance Lc. The distance Lc is determined by the following equation with respect to the distances La and Lb shown in FIG.
Distance La<distance Lc<distance Lb
It is set to satisfy the following.

The opener then inserts the opening tool 71B from the opening K1 into the inside until the flange 71Bb touches the outer surface 11a of the first side panel 11, and then lifts the tip 71Ba side. This causes the tip 71Ba to be lifted just in a position where it abuts the folded-back portion 183, allowing the folded-back portion 183 to be lifted more reliably to open the packaging box 91 (91A).

The opener simply needs to insert the flange 71Bb until it touches the first side panel 11.
The packaging box 91 (91A) can be opened more easily.
In either case, after the folded-back portion 183 is pulled out, the opening jig 71 (71A, 71B) can be pulled out from the opening K1 and used for the next opening operation.

It is preferable that the opening K1 and the folded-back portion 183 have the following relationship.
In the direction in which the upper edge of the third side panel extends (the left-right direction), the opening K1 is located at a position corresponding to the folded-back portion 183. More specifically, in the left-right direction when viewed from the front, the opening K1 is formed at a position where at least a part of its left-right width overlaps with the folded-back portion 183.
In this case, the left-right width of the opening K1 is smaller than the left-right width of the folded-back portion 183, and the opening K1 is preferably formed at a position such that its entire left-right width is included in the folded-back portion 183 in the left-right direction.
According to these, the opener only needs to insert the opening jig 71 straight, and the opening jig 71 is naturally guided to the folded-back portion 183. Therefore, the opener can easily open the packaging box 91.

1 Main body box 1A First half 1B Second half 11 First side plate 11a Outer surface 111 First overlap portion 12 Second side plate 13 Third side plate 131 Second overlap portion 14 Fourth side plate 15 Bottom assembly portion 151 First bottom plate 152 Second bottom plate 153 Third bottom plate 154 Fourth bottom plate 16 Cover plate 16a Slit 16b Top surface 161 Insert piece 161b Abutment portion 162 Rising portion 162a Tip portion 163 Cut portion 17 First side flap 17a Slit 18 Inner flap 18a Slit 18c Bottom surface 18L Lock piece 181 Lock piece base portion 182 Insertion portion 183 Folded portion 183a Folded top portion 184 Cut portion 19 Second side flap 19a Slit 3, 5 Hook portion 31 First hook base 31a Hook hole 31b Hooking portion 31c, 31d Cut 311 First flange 312 Cut 313 Second flange 314 First shoulder 315 Second shoulder 32 Second hook base 32a Hook hole 32b Hooking portion 32c, 32d Cut 321 Third flange 322 Cut 323 Fourth flange 324 Third shoulder 325 Fourth shoulder 51 First hook base 51a, 52a Hook hole 51b, 52b Hooking portion 51e, 51d, 51g, 51h Cut 511 First flange 511a, 513a Slit 512 Opening 513 Second flange 514 First shoulder 515 Second shoulder 52 Second hook base 52c, 52d Cut 521 Third flange 522 Cutout portion 522a Recess 523 Fourth flange 524 Third shoulder portion 525 Fourth shoulder portion 541 Shelf board 543, 544 Arm piece portion 543a, 544a Slit 71, 71A, 71B Opening jig 71a, 71Aa Tip portion 71Ab Mark 71Bb Flange portion 91, 91A Packaging box 91K Opening and closing seal structure ARa Range K1, K2 Openings La, Lb, Lc Distance L71, L91 Length m1, m2, m3, m4, m5, m6, m7, m7a, m7b, m8a, m8b, m9, m10, m11, m12, m13, m13a, m13b, m14, m151, m15b, m31, m51, m5a, m5b Mountain folds mt1, mt2a, mt2b, mt3a, mt3b, mt52, mt5a, mt5b, mt5c, mt5d, mt5e, mt5f Valley folds R Passages W71, W312 Width θa Folding angle

Claims (2)

The device has a main body box and a hook portion,
The main body box includes:
First to fourth side plates forming a rectangular tube;
a cover plate having an opening through which a part of the hook portion can pass, the cover plate being connected to an upper edge of the first side plate and being bent to close an upper opening of the rectangular cylinder;
An insertion piece that is connected to the tip edge of the cover plate and can be folded in half;
A raised portion formed on the insertion piece and capable of being bent inward;
a lock piece including a lock piece base portion formed on an upper edge portion of a third side plate facing the first side plate and capable of being folded outward in a valley direction, an insertion portion connected to a tip of the lock piece base portion and capable of being folded in a mountain direction, and a fold-back portion connected to a tip of the insertion portion and capable of being folded in a mountain direction;
having
With the rising portion folded inwardly of the rectangular tubular body and the locking piece folded outwardly, the cover plate is closed by folding the insertion piece inwardly of the third side plate, and the locking piece is inserted into the third side plate while being folded inwardly of the third side plate. The locking piece is folded inwardly so that the folded back portion overlaps the inserted portion, and is inserted into the opening obtained by folding the rising portion inwardly. The folded back portion naturally returns to its original folding position, thereby making it impossible for the locking piece to be folded outward again.
In the closed state, a passage is formed between the opening and the folded-back portion, allowing the entry of a long plate-like member ,
The hook portion is a packaging box having a shelf board extending from the opening toward the folded portion . A packaging box opening/closing structure in which a packaging box having a main box and a hook portion and closed is opened using a long plate-shaped opening tool,
The main body box includes:
First to fourth side plates forming a rectangular tube;
a cover plate having an opening through which a part of the hook portion can pass, the cover plate being connected to an upper edge of the first side plate and being bent to close an upper opening of the rectangular cylinder;
An insertion piece that is connected to the tip edge of the cover plate and can be folded in half;
A raised portion formed on the insertion piece and capable of being bent inward;
a lock piece including a lock piece base portion formed on an upper edge portion of a third side plate facing the first side plate and capable of being folded outward in a valley direction, an insertion portion connected to a tip of the lock piece base portion and capable of being folded in a mountain direction, and a fold-back portion connected to a tip of the insertion portion and capable of being folded in a mountain direction;
having
With the rising portion folded inwardly of the rectangular tubular body and the locking piece folded outwardly, the cover plate is closed by folding the insertion piece inwardly of the third side plate, and the locking piece is inserted into the third side plate while being folded inwardly of the third side plate. The locking piece is folded inwardly so that the folded back portion overlaps the inserted portion, and is inserted into the opening obtained by folding the rising portion inwardly. The folded back portion naturally returns to its original folding position, thereby making it impossible for the locking piece to be folded outward again.
The opening tool is inserted through the opening to re-fold the folded-back portion that has naturally returned to its original state,
The hook portion has a shelf plate extending from the opening toward the folded portion and guiding the opening tool inserted from the opening.
Opening and closing structure of packaging box.

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