JP4428808B2 - Cardboard box flap lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure in which two flaps of a cardboard box are overlapped and fixed.
[0002]
[Prior art]
Conventionally, as a cardboard box for storing agricultural products such as cabbage and pumpkin, as shown in FIG. 7, one having extended short flaps 52 and 53 from the upper edge of the side walls 50 and 51 of the wide and long sides is used. ing.
[0003]
In this cardboard box, after the contents are stored, the flap 52 and the flap 53 are sequentially folded inward and overlapped, and fixed with the adhesive tape 54, an opening remains on the top surface, and the contents are confirmed from the opening. it can.
[0004]
[Problems to be solved by the invention]
By the way, at the site where agricultural products are boxed, there is a request to fix the overlapped flaps without using adhesive tape, but when boxed agricultural products such as cabbage are large, the contents may rise, It is not possible to use a plug-in lock from above.
[0005]
Accordingly, an object of the present invention is to make it possible to easily fix a flap even when contents are raised.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention forms a locking piece in one flap of two flaps extending from adjacent side walls, a through hole in the other flap, and the other flap in one flap. When the flaps were stacked and the locking piece was pulled out from the through-hole while bending the protruding parts on both sides, the locking piece was prevented from coming off from the through-hole as the protruding part was restored, and both flaps were fixed. .
[0007]
In this lock, the locking piece is pulled up without being inserted, so that even when the contents are raised, the flap can be easily fixed. At this time, since the locking piece does not enter the box, the contents are not damaged.
[0008]
Further, if a check piece that engages with the locking piece is provided on both side edges of the through hole, the locking piece is prevented from returning, so that it can be reliably locked even if the flap is strongly repelled.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a blank of a cardboard box having a lock according to the first embodiment of the present invention. In this blank, a pair of side walls 1 having a wide surface and a side wall 2 having a long surface are alternately arranged. The side walls 1 and 2 are respectively provided with long flaps 3 and 4 at the lower edge and short flaps 5 and 6 at the upper edge, respectively, and a passage piece 7 is provided at the outer edge of one side wall 2. .
[0010]
A locking piece 8 is formed on one side of each flap 5 toward the tip, and protrusions 9 are provided on both side edges. A crease line 10 is formed at the base end of each protrusion 9 so as to approach each other toward the tip of the locking piece 8. Each flap 6 is formed with an oblong through hole 11 at the end close to the locking piece 8, and check pieces 12 are provided on both side edges thereof. At the base end of the check piece 12, a reverse ruled crease line 13 that facilitates bending only to the surface side is formed.
[0011]
To assemble this blank into a box, as shown in FIG. 2, each pair of side walls 1 and 2 is bent into a square tube shape, the passage piece 7 is attached to the opposite side wall 2, and the bottom flap 3; 4 and paste together.
[0012]
And after storing agricultural products etc. in a box, the flaps 5 and 6 of the top | upper surface are folded inward one by one, it piles up, a finger is put on the front-end | tip center part of the latching piece 8, and a through-hole is bent When the locking piece 8 is pulled out from 11, the protruding portion 9 is restored, the locking piece 8 is prevented from coming off from the through hole 11, and both the flaps 5 and 6 are fixed.
[0013]
In this lock, the locking piece 8 is pulled up without being inserted, so that even when the contents are raised, the flaps 5 and 6 can be easily fixed. At this time, the locking piece 8 does not enter the box. 8 does not damage the contents.
[0014]
When pulling out the locking piece 8 from the through-hole 11, the check piece 12 opens to the surface side to allow the passage of the lock piece 8, and then the check piece 12 is restored and the locking piece 8 returns. Therefore, even if the repulsion of the flaps 5 and 6 is strong, it can be locked securely.
[0015]
Next, the cardboard box provided with the lock according to the second embodiment of the present invention is shown in FIG. In this lock, the protrusion 9 is smaller than that of the first embodiment, and the crease line 10 and the check piece 12 are omitted, but the repulsion of the flaps 5 and 6 is not extremely strong. It can be locked in such a form.
[0016]
In addition, as shown in FIG. 4, if the lock is provided only at one place and the flaps 5 and 6 are sequentially bent in the circumferential direction so that the portion where the lock is located is finally overlapped, the labor of the lock is further reduced. Is done. In addition, you may provide the lock of another form only in one place in this way.
[0017]
Next, a lock according to a third embodiment of the present invention is shown in FIG. In this lock, protrusions 14 are provided on both side edges of the through hole 11, and the locking piece 8 is less likely to come out of the through hole 11 than in the second embodiment.
[0018]
Further, in the lock of the fourth embodiment shown in FIG. 6, the width of the through-hole 11 is reduced toward the distal end side of the locking piece 8, and in this mode as well, the locking is greater than that of the second embodiment. It becomes difficult for the piece 8 to come out of the through hole 11.
[0019]
【The invention's effect】
As described above, in the flap lock of the corrugated cardboard box according to the present invention, when the engaging piece formed on the lower flap among the overlapping flaps is pulled out from the through hole formed on the upper flap, the engaging piece becomes the through hole. Since it is prevented from slipping off, both flaps can be easily locked without damaging the contents with the locking piece even when the contents swell.
[Brief description of the drawings]
FIG. 1 is a view showing a blank of a cardboard box having a lock according to the first embodiment. FIG. 2 is a perspective view showing an assembly lock state of the same. FIG. 3 is a perspective view of a cardboard box having a lock according to the second embodiment. [Fig. 4] Perspective view of the single-lock type cardboard box same as above [Fig. 5] Plan view of the lock of the third embodiment [Fig. 6] Plan view of the lock of the fourth embodiment [Fig. 7] Conventional cardboard The perspective view which shows the flap fixed state of the box 【Explanation of symbols】
1, 2 Side wall 5, 6 Flap 8 Locking piece 9 Protruding part 11 Through hole 12 Check piece

Claims (2)

Of the two flaps 5, 6 extending from the adjacent side walls 1, 2, a locking piece 8 is formed in one flap 5, a through hole 11 is formed in the other flap 6, and the other flap 5 is provided with the other flap 5. When the flap 6 is overlapped and the locking piece 8 is pulled out from the through-hole 11 while bending the protruding portions 9 on both sides, the locking piece 8 is prevented from coming off from the through-hole 11 as the protruding portion 9 is restored. A flap lock of a cardboard box to which 6 is fixed. The flap lock of the cardboard box according to claim 1, wherein a check piece (12) that engages with the locking piece (8) is provided on both side edges of the through hole (11).

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