JP2008120423A - Packaging box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing box that is closed easily, maintains the firmly closed state of top plate flaps, and obtains a satisfactory appearance. <P>SOLUTION: The first top plate flaps 10 and second top plate flaps 11 are formed on the upper edges of the side plates 5 and 6 forming a body. Slits 12 are formed in the first top plate flaps 10. Each of the slits 12 has a recess 13. Each of the second top plate flaps 11 has an approximately trapezoidal shape and is provided with insert portions 14, which are inserted in the slits of the corresponding first top plate flap 10. Each of the insert portions 14 is provided with a projection 15 that is locked in the corresponding recess 13 at the initial stage of inclination of the top plate flaps 10 and 11 in the opened direction, with the insert portions 14 inserted in the slits 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging box in which an upper portion of a rectangular tube-shaped body portion is closed by four top plate flaps, and in a closed state, a central portion of the upper portion of the body portion is opened.

  2. Description of the Related Art Conventionally, a corrugated cardboard packaging box including a rectangular tube-shaped body portion formed by four standing side plates and four top plate flaps connected to each other at the upper edge of each side plate via a crease line. Are known. This type of packaging box is often used for packaging vegetables with a relatively long length, and the center of the upper part of the trunk is opened with the top flap closed, so the state of the contents Can be easily confirmed from the outside.

  In this type of packaging box, each top plate flap is closed horizontally by folding it along the fold line of the upper edge of each side plate. At this time, in order to maintain the closed state by each top plate flap In addition, the overlapping portions of the top plate flaps located at the four corners are fastened using a connecting tool such as a staple or an adhesive tape. However, it is troublesome to separate the connecting tools such as staples and adhesive tapes when recycling the cardboard forming the packaging box.

  Therefore, in recent years, a so-called forward-folding lid that can be closed by sequentially folding the top plate flaps is sometimes employed (see, for example, Patent Document 1). The forward folding lid with the top plate flap first bends one of the top plate flaps first, then sequentially folds from the adjacent top plate flaps, the last folded top plate flap and the first folded top plate Swap the direction of polymerization with the flaps up and down.

As described above, the lid by forward folding is advantageous for recycling and the like because the folded state of each top plate flap is maintained without using a connecting tool such as staples or adhesive tape.
JP 2002-166930 A (FIG. 3)

  However, in the case where the body portion is closed by the forward folding of each top plate flap, when the contents accommodated in the body portion are raised, the top side of the overlapped portion of each top plate flap is Not only is the corner portion positioned floating, the top plate flap may be damaged by being caught outside, but it is not preferable in terms of appearance. In addition, since this type of packaging box is closed and the center of the upper part of the trunk is open, it is closed with a finger inserted from the center of the opened upper part of the trunk when transporting etc. There is a case where an operation such as placing the hand on the top plate flap and lifting it is performed, and this also has a disadvantage that each top plate flap jumps up and is inadvertently opened without maintaining the closed state.

  The present invention eliminates such inconveniences, and the present invention provides a packaging box that can easily perform a lid closing operation and can firmly maintain a lid closing state by a top plate flap, and can obtain a good appearance. Objective.

  In order to achieve such an object, the present invention includes a rectangular tube-shaped body portion formed by four standing rectangular side plates and an upper edge of a pair of side plates opposed to each other via a crease line. A pair of first top plate flaps, and a pair of second top plate flaps connected to each other on the upper edges of the pair of side plates opposite to each other via a crease line. When folded horizontally along the crease line of the upper edge of the side plate, the first top plate flaps cover the upper part of the body with a gap between each other, and both the second top plate flaps are folded at the upper edge of the side plate. When folded horizontally along the line of sight and superposed on both first top plate flaps, the second top plate flaps cover the top of the body part with a gap therebetween, and the upper center part of the body part is opened. In the packaging box that is closed in a closed state, the first top plate flap is formed in a rectangular shape, from its tip A pair of slits that incline in directions away from each other toward the base end on the plate side are provided, and the second top plate flap is formed in a substantially trapezoidal shape that becomes gradually narrower from the base end on the side plate side toward the tip. And an insertion piece that protrudes from both ends of the first top plate flap and is inserted into each slit of the first top plate flap. The slit of the first top plate flap extends outward from the base end of the side plate side of the slit. A notched recess is formed, and the first top plate flap and the second top plate flap are opened at the base end portion of the insertion piece of the second top plate flap with the insertion piece inserted into the slit. When tilting in the direction, at the initial stage of tilting, a convex portion is formed that is locked to the concave portion of the slit and restricts the insertion piece from coming out of the slit.

  When closing the upper part of the trunk with each top plate flap in the packaging box of the present invention, first, a pair of opposed first top plate flaps are folded horizontally inward through the crease line of the upper edge of the side plate. The first top plate flaps bent horizontally cover the upper portion of the trunk with a gap between them. Next, the pair of opposing second top plate flaps are bent horizontally inward through the crease line on the upper edge of the side plate. At this time, a part of each second top plate flap is superposed on each of the first top plate flaps adjacent to both sides of the second top plate flap so as to cover the upper part of the trunk part with a gap therebetween. Accordingly, the first top plate flap and the second top plate flap extend along the side plates to the upper portion of the trunk portion, and the upper central portion of the trunk portion is opened.

  Subsequently, when the second top plate flap is further pushed down and tilted inward of the trunk portion, the first top plate flap superposed on the lower side is also pushed down and tilted inward of the trunk portion, whereby the second top plate flap is tilted. The front end of the insertion piece of the plate flap is inserted into the position of the slit of the first top plate flap. Here, when the pressing force of the second top plate flap is released, each top plate flap returns to the horizontal state by the restoring elasticity at the crease line of the upper edge of each side plate. Thereby, the insertion piece of the second top plate flap is further inserted deeply into the slit of the first top plate flap. In this state, when a pushing force is applied to the first top plate flap or the second top plate flap to tilt in the lid opening direction, at the initial stage of tilting, the slit formed in the slit of the first top plate flap. The said convex part formed in the base end of the insertion piece of a 2nd top plate flap is latched by a recessed part. When the convex portion of the insertion piece is locked to the concave portion of the slit, the movement of the insertion piece in the direction of coming out of the slit is restricted, and inadvertent opening can be prevented.

  As described above, according to the packaging box of the present invention, the second top plate flap is pushed down and tilted inward with the first top plate flap so that the tip of the insertion piece corresponds to the position of the slit. Can be inserted into the slit, and by simply releasing the second top plate flap, the insertion amount of the insertion piece deepens into the slit, and the convex portion of the insertion piece engages with the concave portion of the slit. Can be performed very easily.

  And, for example, even if the operation of holding and lifting any top plate flap is performed by inserting a finger from the open center part of the upper part of the trunk surrounded by each top plate flap, The convex portion of the insertion piece is locked to the concave portion of the slit to prevent an inadvertent opening, and the mutual connection state of the first top plate flap and the second top plate flap can be reliably maintained. it can.

  In addition, both side corners of the first top plate flap are concealed under the second top plate flap, and the insertion pieces of the second top plate flap are passed through the slits of the first top plate flap. Since only the side edges of the second top plate flap formed in a trapezoidal shape are exposed at the corners of the top surface, they are hidden in the lower side of the top surface, so in the overlapping portion of the first top plate flap and the second top plate flap No lifting occurs at all, and a closed state with a good appearance can be formed.

  An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory perspective view showing the packaging box of the present embodiment, FIG. 2 is a development view of the packaging box of the present embodiment, FIG. 3 is an explanatory view showing an enlarged main part of FIG. 2, and FIG. FIG. 4B is an explanatory view showing a closing operation of the packaging box of this embodiment, and FIG. 5 is an explanatory view showing an enlarged main part of the packaging box of this embodiment.

  As shown in FIG. 1, the packaging box 1 of the present embodiment includes a rectangular tube-shaped body portion 2, a top portion 3 that closes the upper end of the body portion 2, and a bottom portion that closes the lower end of the body portion 2. 4 is formed in a rectangular parallelepiped shape, and the center part of the top part 3 is opened in a closed state and has a shape suitable for packaging vegetables and the like.

  As shown in FIG. 2, the packaging box 1 has four side plates, that is, a pair of first side plates 5 and a pair of second side plates 6 alternately connected to each other via a trunk fold line a. ing. Each of the side plates 5 and 6 is bent along a trunk crease line a, and then an adhesive piece 7 connected to the edge of one second side plate 6 is bonded to the end of one first side plate 5. As a result, the body 2 (see FIG. 1) is formed. Further, a first bottom plate flap 8 is connected to the lower end edge of each first side plate 5 and a second bottom plate flap 9 is connected to the lower end edge of each second side plate 6 via bottom fold lines b and c, respectively. Yes. The bottom plate flaps 8 and 9 are bent horizontally along the bottom fold lines b and c to form the bottom 4 (see FIG. 1).

  Next, the structure of the top part 3 of the present embodiment according to the present invention will be described in detail. As shown in FIG. 2, a first top plate flap 10 is connected to the upper end edge of each first side plate 5 via a first top fold line d, and each second side plate 6 is similarly configured. The second top plate flap 11 is continuously provided through the second top fold line e.

  The first top plate flap 10 includes a pair of slits 12 that are inclined at an angle of about 45 ° in a direction away from each other toward the base end on the first side plate 5 side from the distal end. Further, as shown in FIG. 3, each slit 12 is formed with a recess 13 that is notched outward from its base end.

  As shown in FIG. 2, the second top plate flap 11 has a substantially trapezoidal shape in which both side edges are inclined at an angle of about 45 ° so that the width gradually becomes narrower from the proximal end on the second side plate 6 side toward the distal end. Is formed. The second top plate flap 11 is formed with an insertion piece 14 that protrudes from both ends of the second top plate flap 11 and can be inserted into each slit 12 of the first top plate flap 10. Further, as shown in FIG. 3, a convex portion 15 is formed at the base end portion of each insertion piece 14 so as to protrude in a direction along both inclined side edges of the second top plate flap 11. The convex portion 15 is provided at a position where the convex portion 15 is engaged with the concave portion 13 of the slit 12 when the insertion piece 14 of the second top plate flap 11 is inserted into the slit 12 of the first top plate flap 10.

  Next, the closing operation of the packaging box 1 having the above configuration will be described. The packaging box 1 of the present embodiment connects the edge of one second side plate 6 and the end of one first side plate 5 by the adhesive piece 7 to form each cylindrical body 2, and the bottom In a state where 4 is not formed (a state where it is not closed by the first bottom plate flap 8 and the second bottom plate flap 9), a lid closing operation is performed prior to storing contents such as vegetables.

  First, as shown in FIG. 4A, the first top plate flap 10 is bent inward along the first top fold line d so as to be perpendicular to the first side plate 5. Next, the second top plate flap 11 is bent inward along the second top fold line e so as to be perpendicular to the second side plate 6. Thereby, the lower surfaces on both sides of the second top plate flap 11 are superposed on the upper surfaces on both sides of the first top plate flap 10.

  Subsequently, the second top plate flap 11 is further pushed down so as to have an acute angle with respect to the second side plate 6, and is inclined inwardly of the trunk portion 2 through the second top fold line e. Along with this, the first top plate flap 10 is inclined inwardly of the trunk portion 2 through the first top fold line d by the pressing force of the second top plate flap 11. As a result, as shown in FIG. 4B, the tip of each insertion piece 14 is inserted into the corresponding slit 12.

  Next, in a state where the tip of each insertion piece 14 is inserted into the slit 12, the second top plate flap 11 is released from being pushed down. As a result, as shown in FIG. 1, the second top plate flap 11 and the first top plate flap 10 both return horizontally due to the restoring elasticity at the second top fold line e and the first top fold line d, The insertion piece 14 is completely inserted into the slit 12. Thus, the packaging box 1 of this embodiment can perform the lid | cover operation very easily, and can close a lid | cover rapidly.

  Then, a pushing force is applied to the first top plate flap 10 or the second top plate flap 11 in a state where the insertion piece 14 is completely inserted into the slit 12, and the first top plate flap 10 and the second top plate flap 11 are applied. As shown in FIG. 5, the convex portion 15 of the insertion piece 14 is locked to the concave portion 13 of the slit 12 at the initial stage of the tilting. As a result, the insertion piece 14 is prevented from coming out of the slit 12, and tilting of the first top plate flap 10 and the second top plate flap 11 in the opening direction can be prevented.

  Thereafter, the contents are stored in the body 2 with the top 3 closed. That is, although not shown, the body 2 with the top 3 closed is turned upside down, and contents such as vegetables are introduced from the opened bottom side, and the bottom plate flaps 8 and 9 are connected to the bottom fold line b, The bottom 4 (see FIG. 1) is formed by being folded horizontally along c. Then, the bottom plate flaps 8 and 9 are sealed with staples or adhesive tape, the body portion 2 is inverted, and the top portion 3 is directed upward, whereby the contents storage operation is completed.

  The packaging box 1 of the present embodiment is not only connected to each other with the insertion piece 14 of the second top plate flap 11 inserted into the slit 12 of the first top plate flap 10 in the closed state as described above. Even if a force in the opening direction is applied to the top plate flaps 10 and 11, the convex portion 15 of the insertion piece 14 is locked to the concave portion 13 of the slit 12, thereby preventing inadvertent opening. Thus, the closed state can be firmly maintained.

  Moreover, as shown in FIG. 1, at the four corners where the second top plate flap 11 overlaps on the first top plate flap 10, both end corners of the first top plate flap 10 are not exposed, and the second Since the insertion piece 14 of the top plate flap 11 is also hidden under the first top plate flap 10 through the slit 12, only the both end edges inclined to the trapezoidal shape of the second top plate flap 11 are exposed. The top portion 3 formed by the top plate flaps 10 and 11 is substantially flat and has a good appearance.

An explanatory perspective view showing a packaging box of one embodiment of the present invention. The expanded view of the packaging box of this embodiment. Explanatory drawing which expands and shows the principal part of FIG. Explanatory drawing which shows the lid closing operation | work of the packaging box of this embodiment. Explanatory drawing which expands and shows the principal part of the packaging box of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Packaging box, 2 ... Body part, 5, 6 ... Side plate, 10 ... 1st top plate flap, 11 ... 2nd top plate flap, 12 ... Slit, 13 ... Recessed part, 14 ... Insertion piece, 15 ... Convex part .

Claims (1)

A square cylindrical body formed by four rectangular side plates that stand, and a pair of first top plate flaps that are connected to the upper edges of the pair of side plates facing each other via a crease line; A pair of second top plate flaps connected to each other on the upper edges of the pair of side plates opposed to each other via a crease line, and both the first top plate flaps horizontally along the fold line on the upper edge of the side plate When bent, the first top flaps cover the upper portion of the body with a gap therebetween, and both the second top flaps are folded horizontally along the crease line of the upper edge of the side plate. In the packaging box which is closed when the second top plate flap is overlapped with the plate flap and the upper part of the trunk part is opened with the gap between each other, the upper central part of the trunk part is opened,
The first top plate flap is formed in a rectangular shape, and includes a pair of slits that are inclined in directions away from each other toward the base end on the side plate side,
The second top plate flap is formed in a substantially trapezoidal shape that becomes gradually narrower from the base end on the side plate side toward the front end, protrudes from the front end to both sides, and is inserted into each slit of the first top plate flap. With a piece,
The slit of the first top plate flap is formed with a recess notched outward from the base end on the side plate side of the slit,
When the first top plate flap and the second top plate flap are tilted in the opening direction in a state where the insertion piece is inserted into the slit, the tilting of the second top plate flap is tilted in the opening direction. A packaging box, characterized in that, initially, a convex portion is formed that is engaged with the concave portion of the slit to restrict the insertion piece from coming out of the slit.

Images