JP4666140B2 - Cardboard sheet folding lock - Google Patents

Description

  The present invention relates to a folding lock that holds a cardboard sheet, which is a paper container material, such as a lid of a gift packaging box or a personal box, in a folded and stacked state.

  When the used gift box is discarded, the dismantled body box and lid may be folded in two to reduce the volume for the purpose of volume reduction. At this time, a lock as shown in FIG. 7 is used as a lock for preventing the return of the fold due to the repulsion of the thick paper.

  This lock is provided with a trapezoidal trapezoidal lock piece 51 formed at the edge of the overlapping cardboard sheet 50 by cutting, and the lock pieces 51 and 51 are bent in the same direction so that one lock piece 51 is pulled out. The overlapping state of the two sheets 50 and 50 is maintained by the friction between the side edge of this and the side edge of the other lock piece 51.

  However, in the lock as described above, when the repulsion of the cardboard sheet is large, the lock piece may be bent back and the lock may be released. The repulsive force of the sheet varies depending on the position of the sheet. In many cases, the sheet folded in two is larger at a position near the sheet edge than at a position near the center.

  Therefore, the present invention is intended to provide a lock that can reliably hold folded cardboard sheets in a stacked state.

  As conventional techniques for the same purpose, those shown in Patent Documents 1 and 2 below have been proposed. However, as shown in Patent Document 1, it is necessary to provide a lock piece sandwiched between two cut lines at the edge of the sheet and to make the two cut lines forming the lock piece obliquely inclined in the same direction. There is. Also, in the device shown in Patent Document 2, it is necessary to provide a lock piece with a drum-shaped cut line with a central portion confined at the edge of the sheet. As described above, the lock pieces in both of the above-mentioned documents have the cut positions of the lock pieces specified only at the end of the sheet, and it is necessary to make two cut lines diagonally or There were restrictions such as cutting the eye line into a drum shape.

In addition to the above, in the conventional device in which a lock piece is provided at the end of the sheet as shown in FIG. 7, there is an accident such as a hand touching and bending the lock piece during normal use as a packaging box. Prone to occur. Furthermore, since the lock piece is at the end of the seat, there is a problem that even if a small force is applied, the lock piece is broken or bent.
Japanese Patent No. 3606031 JP 2002-2111539 A

In order to solve the above-mentioned problem, the first of the present invention is to provide a pair of locking tongues where the cardboard sheets are folded and overlapped, and hold the overlapping state of the sheets by engaging both locking tongues with each other. In the folding lock to
The locking tongue has a shape in which one end portion is continuous with the sheet via a crease line and the remaining side portion is surrounded by a geometric cut line, and both locking tongue pieces are When the two locking tongues are folded in the same direction by folding the seats in the same direction, the sides of one locking tongue are connected to the other locking tongue. It is a cardboard sheet folding lock characterized by being locked on the edge of a hole that has been removed.

  According to a second aspect of the present invention, the cardboard sheet is a box blank sheet, and a crease line is provided at a position where the blank sheet is folded in two. The cardboard according to the first invention This is a folding lock for the seat.

  According to a third aspect of the present invention, the box blank sheet is a corrugated cardboard sheet, and a crease line is provided in the same direction as the flute direction (corrugation) of the corrugated cardboard. A cardboard sheet folding lock.

  According to a fourth aspect of the present invention, a locking tongue piece is provided at a position facing each other across the fold line for making the two fold, and at a non-end edge portion in the seat surface. A cardboard sheet folding lock according to any one of the third inventions.

  In the folding lock of the present invention, when the locking tongue piece is cut, there is no positional restriction as in the prior art, and it is not necessary to form a locking tongue piece sandwiched between two cut lines. . In addition, when used as a gift box, the hand does not touch and break the locking tongue, and it is resistant to loads, so accidents are unlikely to occur. In this way, handling during normal use as a box is easy, and when discarding after use, folds of cardboard sheets that have been disassembled and folded are stacked to prevent folds from returning due to repulsion of cardboard. Can be retained. Further, this lock has no directionality and can be locked from any direction.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 2 shows a gift packaging box provided with a folding lock according to the present invention. This packaging box is made of a corrugated cardboard sheet, and is composed of a body box 1 for storing merchandise and a lid 2 for covering it.

  The lid 2 is composed of the blank sheet shown in FIG. 1, and this blank sheet has side plates 4, 4 on the two sides of one pair among the peripheral sides of the rectangular substrate 3 to be the lid plate, and the other pair. The end plates 5 and 5 are connected to the two sides, and the joining flaps 6a and 6b are connected to the side edges of the side plate 4 respectively. As described above, the lid 2 has a structure in which four corners are bonded by the joining flaps 6a and 6b using an adhesive.

  The opposing two side plates are formed with a crease line or a perforation line or a half cut line for folding the lid at the time of disposal at the center, and the crease line 7 is used as an axis of symmetry at both ends of the side plate 4. A similar crease line 8 inclined at 45 degrees is provided. The rectangular substrate 3 serving as a cover plate is provided with a folding fold line 7 b on the extension of the fold line 7. The crease line 7b may be provided so as to cross the substrate 3, but due to the strength of the lid and the problem of aesthetics, it is necessary to provide the minimum necessary length as a guide at the time of bending from both sides of the substrate. More desirable. These crease lines 7 and 7b are preferably provided in the same direction as the flute direction (step) of the corrugated cardboard. When the material is cardboard, it is preferably provided in the same direction as the paper making direction. By providing in these directions, it becomes easy to bend and a lid with little repulsion can be obtained.

  The above-mentioned side plates 4 and 4 are for locking that holds the overlapping state of the stacked sheets when the sheet is folded in two along the crease line 7 at a position facing the fold line 7 in the center. Tongue pieces 10a and 10b are provided.

The locking tongues 10a and 10b have a shape in which one end portion is continuous with the sheet via the crease line 12, and the remaining side portion is surrounded by the geometrical cut line 11. Each locking tongue is formed at a position where the sheet overlaps when the sheet is folded from the crease line 7, and the illustrated example is provided on the side plate 4, but may be provided on the substrate 3. The position may be anywhere as long as it is a portion that overlaps when the sheet is folded and is a non-end edge portion in the sheet surface.
The locking tongues 10a and 10b are provided at substantially symmetrical positions with the crease line 7 in between, but are not strictly symmetrical. That is, as shown in FIG. 1, the crease lines 12 of both locking tongues facing each other with the crease line 7 in between are in substantially symmetrical positions with respect to the crease line 7, but the shape of the cut line 11 is It is provided in a shape slightly shifted from each other. In other words, the locking tongues are provided so as to be shifted laterally (in the direction of the crease line 7), so that when the locking tongues that fold the sheets are folded in the same direction, The side portion of the locking tongue piece is formed so as to be able to ride on and lock the edge of the hole from which the other locking tongue piece is removed.

  In addition, the shape of both locking tongue pieces 10a and 10b is formed in a substantially U-shape in the illustrated embodiment. However, the shape is not limited to the illustrated shape, and may be formed by a trapezoidal shape, a notch shape, an Ω-shape, a dharma shape, or a U-shaped cut line 11. A straight crease line 12 is formed by connecting both ends of the appropriate cut line 11, and a locking tongue piece 10 a or 10 b is formed on the inner side surrounded by the cut line 11 and the crease line 12.

  In order to assemble the blank sheet of FIG. 1 as a lid, the side plate 4 and the end plate 5 which are adjacent to each other are joined by the joining flaps 6 a and 6 b, and then the side plate 4 and the end plate 5 are erected with respect to the substrate 3. When packing the product, the lid 2 assembled as described above is used by covering the body box 1 storing the product from above.

  In order to fold the lid 2, as shown in FIGS. 3 (a) to 3 (b), the side plate 4 is folded inward along the crease line 8, and the end plate 5 is tilted inward and flattened. As shown in FIGS. 4A to 4B, the lid 2 in a flat state is folded in two along the crease lines 7 and 7b, and the locking tongue pieces 10a and 10b are folded in the same direction.

  As a result, a protruding portion is formed at the side edge of the hole in the one locking tongue piece, and the side portion of the other locking tongue piece is engaged with this protruding portion, and the sheet constituting the lid 2 is overlapped. Locks securely in the tatami state.

  On the other hand, although not shown in the figure, the body box 1 may be a structure of a type in which four corners are bonded with an adhesive, or an assembly type carton, like the lid. In addition to the assembled box as illustrated, the wrap round paper container is also provided with a lock piece similar to the lid, so that when disposing, the disassembled sheets are folded in two and stacked. The locking tongue piece can be engaged and locked.

  Further, in the folding lock of the body box 1 and the lid 2 as described above, since the locking tongue pieces 10a and 10b are similarly locked regardless of the direction, there is no need to be aware of the bending direction. In addition, the lock strength can be adjusted by changing the size of the locking tongues 10a and 10b in accordance with the thickness of the corrugated cardboard sheet.

  FIG. 4 shows a state in which when the lid is discarded, the portion of the substrate 3 is valley-folded and the locking tongue pieces are engaged and locked in a state of being overlapped. If the substrate 3 is folded and locked in this manner, the substrate can be folded into a flat state and is not bulky, which is preferable. However, it is also possible to fold the substrate portion.

It is an expanded view which shows the blank of the lid | cover provided with the folding lock which concerns on this invention. It is a perspective view which shows the state which covered the cover same as the above to the box box. (A)-(B) is a perspective view showing the folded state of the upper lid. (A) shows a state in which the same upper lid is folded in two, and (B) is a perspective view showing a state where the locking tongue piece is pressed and locked. It is an expansion perspective view which shows the state which made the same top lid into a valley fold. It is an expansion perspective view which shows the pushing lock state of the locking tongue piece of FIG. It is a perspective view which shows the conventional lock | rock.

Explanation of symbols

1 Body box 2 Lid 3 Substrate 4 Side plate 5 Tail plate 6a, 6b Joint flap 7, 7b 8 Fold line
10a, 10b Locking tongue 11 Cut line
12 Fold line

Claims (4)

A folding lock that holds a superposed state of a sheet by providing a pair of locking tongues at a place where the cardboard sheets are folded and overlapped, and engaging both locking tongues with each other,
The locking tongue has a shape in which one end portion is continuous with the sheet via a crease line and the remaining side portion is surrounded by a geometric cut line, and both locking tongue pieces are When the two locking tongues are folded in the same direction by folding the seats in the same direction, the sides of one locking tongue are connected to the other locking tongue. A cardboard sheet folding lock characterized by being locked on the edge of a hole that has been removed.   The cardboard sheet folding lock according to claim 1, wherein the cardboard sheet is a box blank sheet, and a fold line is provided at a position where the blank sheet is folded in two.   3. The cardboard sheet folding lock according to claim 2, wherein the box blank sheet is a corrugated cardboard sheet, and a crease line is provided in the same direction as a flute direction (corrugation) of the corrugated cardboard.   4. A locking tongue piece is provided at a position facing each other across a fold line to be folded in two and at a non-end edge portion in the seat surface. A folding lock for cardboard sheets according to crab.

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