JP2002068165A - Flap lock of corrugated carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking means capable of easily fixing a flap even when contents swell. SOLUTION: A locking piece 8 is provided on one side flap 5 of two flaps 5 and 6 which extend from adjacent side walls 1 and 2, and a through hole 10 is provided on the other side flap 6. Projections 9 are formed on both sides of the locking piece 8, and the inner projection 9 is made difference in grade so as to be apart from the end of a main body of the locking piece 8 more from the outer projection 9. The other side flap 6 is overlaid on one side flap 5, and the locking piece 8 is pulled out from the through hole 10 while folding the both side projections 9. As a result of this, the locking piece 8 is prevented from slipping off the through hole 10 following restore of the projections 9, and the both flaps 5 and 6 are engaged and fixed in a slightly lifted state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cardboard box 2
The present invention relates to a structure in which two flaps are overlapped and fixed.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, short flaps 52, 53 are respectively extended from upper edges of side walls 50, 51 of a wide side and a long side as a cardboard box for storing agricultural products such as cabbage and pumpkin. That is used.

In this cardboard box, after the contents are stored, the flap 52 and the flap 53 are sequentially bent inward and overlapped with each other and fixed with an adhesive tape 54, and an opening remains on the top surface. You can see things.

[0004]

At the site where agricultural products are boxed, there is a demand to fix the overlapped flaps without using an adhesive tape. The contents may swell and a general plug-in lock from above cannot be used.

[0005] Therefore, an object of the present invention is to make it possible to easily fix the flap even when the contents rise.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, of two flaps extending from an adjacent side wall, a locking piece is provided on one flap and a through hole is provided on the other flap. A projection is formed on both sides of the locking piece, a step is formed so that the inner projection is further away from the base end of the locking piece than the outer projection, and the other flap is overlapped with one flap, When the stopper is pulled out from the through hole while bending the protrusions on both sides, the locking piece is prevented from falling out of the through hole with the restoration of the protrusion, so that both flaps are engaged, and the floating of the flap is allowed. It was.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cardboard box blank with a lock according to the invention. In this blank, a pair of width side walls 1 and a long side wall 2 are alternately provided. The side walls 1, 2 have long flaps 3, 4 respectively at the lower edge and short flaps 5, 6 respectively at the upper edge.
Are continuously provided, and a passage piece 7 is provided on an outer edge of one of the side walls 2.

[0010] Of the two flaps 5, a locking piece 8 is formed by cutting one side of one flap 5, and the locking piece 8 is formed around a fold on the tip side of the flap 5 as an axis. It is undulating. Protrusions 9 are provided on both side edges of the locking piece 8, and these projections 9 are provided with steps so that the inner one is farther from the base end of the locking piece 8 than the outer one. . Further, of the two flaps 6, at the end of the flap 6 which is close to the locking piece 8, a through hole 10 of a horizontally long ellipse is provided.
Are formed.

In order to assemble this blank into a box, as shown in FIG. 2, each pair of side walls 1 and 2 is bent into a rectangular tube shape, and a joint piece 7 is attached to the opposite side wall 1. Then, the flaps 3 and 4 on the bottom face are overlapped and bonded.

After the agricultural products are stored in the box, the top flaps 5 and 6 are successively bent inward in the circumferential direction so that the portions where the locks are located are finally overlapped, and overlapped. When the user puts a finger on the center of the tip and pulls out the locking piece 8 from the through hole 10 while bending the protrusion 9, the protrusion 9
Is restored, and the locking piece 8 is prevented from falling out of the through hole 10.

At this time, as shown in FIG. 2 and FIG. 3, the flaps 6 having the through holes 10 are slightly raised, and the projections 9 engage the flaps 5 and 6 with each other, so that the contents can be removed. Even when the swelling occurs, the flaps 5 and 6 are securely fixed, and at this time, the locking pieces 8 do not enter the box, so that the contents are not damaged by the locking pieces 8.

When stacking this cardboard box,
When the lock is located on the back side, the locking piece 8 of the lower cardboard box does not catch on the bottom of the upper cardboard box, thereby preventing damage to the lock.

[0013]

As described above, in the flap lock for a cardboard box according to the present invention, stepped projections are provided on both sides of the locking piece pulled out from the through hole, and both projections are engaged with the projections. Therefore, even when the contents are raised, both flaps can be easily and reliably fixed while allowing the flaps to float.

[Brief description of the drawings]

FIG. 1 shows a blank of a cardboard box provided with a lock according to the present invention.

FIG. 2 is a perspective view showing an assembled locked state of the above.

FIG. 3 is an upper longitudinal sectional side view of the above.

FIG. 4 is a perspective view showing a conventional cardboard box with a flap fixed.

[Explanation of symbols]

 1, 2 Side wall 5, 6 Flap 8 Locking piece 9 Projection 10 Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Osawa 2-3-3 Nishiki, Naka-ku, Nagoya-shi Nagoya Branch of National Agricultural Cooperative Association (72) Inventor Fumio Asada 111 Kasamatsu, Nishiyukicho, Toyohashi-shi Prefectural economy Federation of agricultural cooperatives (72) Inventor Hiroharu Ito 1 Oike, Nakahara-cho, Toyohashi City Inside the Toyohashi Plant of Rengo Co., Ltd. (72) Atsushi Ishikawa 5-14-8 Ryoke, Kawaguchi City Rengo Co., Ltd. F term in the center (reference) 3E060 AA03 AB05 BA08 BC02 DA13 EA06 EA12

Claims (1)

[Claims] An engaging piece (8) is attached to one of the two flaps (5, 6) extending from adjacent side walls (1, 2).
The other flap 6 is provided with a through hole 10, and a projection 9 is formed on both sides of the locking piece 8 so that the inner projection 9 is farther from the base end of the locking piece 8 than the outer projection 9. With a step
One flap 5 is overlapped with the other flap 6 and the locking piece 8
Is pulled out of the through-hole 10 while bending the protrusions 9 on both sides, the locking piece 8 is prevented from falling out of the through-hole 10 as the protrusion 9 is restored, and the flaps of the cardboard box are engaged with the flaps 5 and 6. Lock.