Assembly-type packaging box

Abstract

An assembly-type packaging box is configured by erecting a front and rear panel along valley fold lines respectively in front of and behind a bottom panel; then folding outer panels, upper-edge panels, and inner panels, such that rear folding tabs extending from a side of the rear panel are folded in between the outer and inner panel. This allows the upper-edge panels to form a frame having a predetermined width at an opening portion. Folding protrusions, which fix positions of the upper-edge panels forming the frame by abutting on the rear folding tabs folded in between each of the outer panels and each of the inner panels, are formed on sides of the inner panels. With this configuration, the box allows to prevent displacement of the upper-edge panel forming the frame and generation of a gap caused by the displacement of the upper-edge panel.

Claims

1. An assembly-type packaging box, comprising: a bottom panel, a front panel and a rear panel erecting along valley fold lines respectively in front of and behind the bottom panel, and outer panels, upper-edge panels, and inner panels which are sequentially connected to right and left of the bottom panel across valley fold lines, and which are sequentially folded such that a rear folding tab extending from a side of the rear panel is folded in between the outer panel and the inner panel and the upper-edge panels form a frame having a predetermined width at an opening portion, front folding tabs extending from sides of the front panel, each being folded in between the outer panel and the inner panel, the front folding tab and the rear folding tab being connected between the outer panel and the inner panel, an top panel and a front cover panel connected to the rear panel across valley fold lines, and front-panel inserting tabs connected to sides of the front cover panel across valley fold lines, each being inserted between the outer panel and the front folding tab, wherein folding protrusions, each fixing a position of the upper-edge panel by abutting on the rear folding tab folded in between the outer panel and the inner panel, are formed only on rear sides of the inner panels.

2. The assembly-type packaging box according to claim 1, wherein top inserting tabs are connected to sides of the top panel across valley fold lines, and the top-panel inserting tabs are positioned along inner side surfaces of the inner panels, respectively.

3. The assembly-type packaging box according to claim 1, wherein locking protrusions formed on edge sides of the inner panels are respectively locked with locking holes formed on the bottom panel.

4. The assembly-type packaging box according to claim 1, wherein the folding protrusion is formed in an arc shape.

5. The assembly-type packaging box according to claim 1, wherein the folding protrusion is formed at a position adjacent to the upper-edge panel.

6. The assembly-type packaging box according to claim 1, wherein the folding protrusions are not formed on sides that the front folding tabs are present.

7. The assembly-type packaging box according to claim 6, wherein each of the folding protrusions has an arc shape, and an outermost part of the arc shape abuts on the rear folding tab.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 is a plan view of a development sheet in a state where an assembly-type packaging box is developed in a first embodiment according to the present invention;

(2) FIG. 2 is a perspective view of the development sheet illustrated in FIG. 1;

(3) FIG. 3 is a perspective view illustrating a state where a front panel, a rear panel, and right and left folding tabs are folded in the first embodiment;

(4) FIG. 4 is a perspective view illustrating a process of forming a frame using upper-edge panels on the right and left in the first embodiment;

(5) FIG. 5 is a perspective view illustrating a state where a packaging box is assembled in the first embodiment;

(6) FIG. 6 is an enlarged cross-sectional view of a folding protrusion portion as seen in a direction of an arrow A from a cut portion indicated by a chain line in FIG. 5;

(7) FIG. 7 is an enlarged cross-sectional view of the folding protrusion portion as seen in a direction of an arrow B from the cut portion indicated by the chain line in FIG. 5;

(8) FIG. 8 is a plan view of a development sheet in a state where an assembly-type packaging box is developed in a second embodiment;

(9) FIG. 9 is a perspective view of the development sheet illustrated in FIG. 8;

(10) FIG. 10 is a perspective view illustrating a process of forming a frame using right and left upper-edge panels in the second embodiment;

(11) FIG. 11 is a perspective view illustrating a process of forming a frame using a front upper-edge panel in the second embodiment;

(12) FIG. 12 is a perspective view illustrating a state where a packaging box is assembled in the second embodiment;

(13) FIG. 13 is a plan view of a development sheet illustrating a state where a conventional packaging box in developed; and

(14) FIG. 14 is a perspective view illustrating a state where a packaging box is assembled using the development sheet illustrated in FIG. 13.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(15) A first embodiment of an assembly-type packaging box according to the present invention will be described with reference to FIGS. 1 to 7. FIGS. 1 and 2 illustrate a development sheet 1 of an assembly-type packaging box in a front view and a perspective view, and the development sheet 1 illustrated in this example is formed by performing punching on a tab of synthetic paper. Further, the broken lines expressed in FIGS. 1 and 2 all indicate valley fold lines of 90 degrees.

(16) Incidentally, a difference between the development sheet 1 illustrated in FIGS. 1 and 2 and a development sheet 10 illustrated in FIG. 13, which has already been described, is that folding protrusions 20b and 23b each of which is formed in an arc shape are added on sides of a left inner panel 20 and a right inner panel 23 of the development sheet 1 illustrated in FIGS. 1 and 2.

(17) Hereinafter, a packaging box using the development sheet 1 illustrated in FIGS. 1 and 2 will be described according to an assembling sequence illustrated in FIGS. 3 to 5.

(18) First, a front panel 12 and a rear panel 13 are folded in the state of being erected with a rectangular-shaped bottom panel 11 of the development sheet 1 as the center as illustrated in FIG. 3. Further, each of left- and right-front folding tabs 14 and 15 connected to the front panel 12 is folded along valley fold lines, and each of left- and right-rear folding tabs 16 and 17 connected to the rear panel 13 is folded along valley fold lines in the same manner.

(19) Accordingly, slit portions of connecting slits 14a and 15a formed on the left- and right-front folding tabs 14 and 15 are directed downward. Accordingly, slit portions of connecting slits 16a and 17a formed on the left- and right-rear folding tabs 16 and 17 are directed upward.

(20) Consequently, the connecting slit 14a of the left-front folding tab 14 and the connecting slit 16a of the left-rear folding tab 16 are inserted to each other so as to vertically intersect each other, whereby it is possible to connect both the folding tabs. Similarly, the connecting slit 15a of the right front folding tab 15 and the connecting slit 17a of the right rear folding tab 17 are inserted to each other so as to vertically intersect each other, whereby it is possible to connect both the folding tabs. FIG. 3 illustrates a state where the front, rear, left- and right-folding tabs 14, 16, 15 and 17 are connected.

(21) Subsequently, a left outer panel 18, a left upper-edge panel 19, and the left inner panel 20 are folded in order to insert a left locking protrusion 20a formed on the left inner panel 20 into a left locking hole 11a formed in the bottom panel 11 as illustrated in FIG. 4. Accordingly, the left outer panel 18, the left upper-edge panel 19, and the left inner panel 20 cover the left-front folding tab 14 and the left-rear folding tab 16 in the state of being connected to each other, and the left upper-edge panel 19 is formed as a frame on the left side of the box so as to be positioned in a frame shape.

(22) At this time, the left folding protrusion 20b formed on the side of the left inner panel 20 is disposed by being folded inward so as to be positioned directly below the left upper-edge panel 19. The left folding protrusion 20b is formed in an arc shape across a valley fold line at a position approaching (adjacent) to the left upper-edge panel 19 on a side facing the rear side of the left inner panel 20.

(23) Similarly, a right outer panel 21, a right upper-edge panel 22, and the right inner panel 23 are folded in order to insert a right locking protrusion 23a formed on the right inner panel 23 into a right locking hole 11b formed in the bottom panel 11.

(24) Accordingly, the right outer panel 21, the right upper-edge panel 22, and the right inner panel 23 cover the right front folding tab 15 and the right rear folding tab 17 in the state of being connected to each other, and the right upper-edge panel 22 is formed as a frame on the right side of the box so as to be positioned in a frame shape.

(25) At this time, similarly, the right folding protrusion 23b formed on the side of the right inner panel 23 is disposed by being folded inward so as to be positioned directly below the right upper-edge panel 22. Incidentally, the right folding protrusion 23b is formed in an arc shape across a valley fold line at a position approaching (adjacent) to the right upper-edge panel 22 at a side facing the rear side of the right inner panel 23.

(26) Although the example shown in FIG. 4 illustrates the right outer panel 21, the right upper-edge panel 22, and the right inner panel 23 are folded beforehand, it is obvious that there is no problem even if the folding order of the right and left is reversed.

(27) Further, a left top-panel inserting tab 25 and a right top-panel inserting tab 26 are folded with respect to the top panel 24 to fold the top panel 24 with respect to the rear panel 13, whereby the left top-panel inserting tab 25 and the right top-panel inserting tab 26 are accommodated in a box. That is, the left top-panel inserting tab 25 is turned into the state of being in contact with the left inner panel 20, and the right top-panel inserting tab 26 is turned into the state of being in contact with the right inner panel 23.

(28) Accordingly, the left upper-edge panel 19 and the right upper-edge panel 22 are turned into the state of being positioned on both the right and left sides of the closed top panel 24, respectively, in a frame shape.

(29) Subsequently, each of the left front-panel inserting tab 28 and the right front-panel inserting tab 29 is folded with respect to the front cover panel 27, and the left front-panel inserting tab 28 is inserted into a gap between the left outer panel 18 and the left-front folding tab 14. Similarly, the right front-panel inserting tab 29 is inserted into a gap between the right outer panel 21 and the right front folding tab 15, whereby it is possible to assemble the cuboid-shaped packaging box 1A illustrated in FIG. 5.

(30) FIGS. 6 and 7 illustrate the action of the left folding protrusion 20b formed on the side of the left inner panel 20.

(31) As described above, the left folding protrusion 20b constitutes the arc-shaped small protrusion and is folded along the valley fold line directly below the left upper-edge panel 19, and an arc-shaped distal end portion thereof abuts on the left-rear folding tab 16. In addition, the abutment position of the left folding protrusion 20b on the left-rear folding tab 16 is the position approaching to the rear panel 13 (the position adjacent to the top panel 24 of the rear panel 13, that is, a position at a left upper corner of the rear panel 13 in FIGS. 3 and 4, thus, movement of the left-rear folding tab 16 in a width direction (movement toward the outside of the box) is effectively prevented.

(32) Thus, the left inner panel 20 in which the left folding protrusion 20b is formed and the left upper-edge panel 19 connected thereto are prevented from being displaced toward the outside of the box. As a result, the generation of the gap between the left upper-edge panel 19 and the top panel 24 forming the frame is prevented.

(33) Although the description has been given regarding the action of the left folding protrusion 20b, the right folding protrusion 23b is at a laterally symmetric position with the left folding protrusion 20b, and accordingly, the same action and effect may be obtained with the right folding protrusion 23b.

(34) That is, the abutment position of the right folding protrusion 23b on the right rear folding tab 17 is the position approaching to the rear panel 13 (the position adjacent to the top panel 24 of the rear panel 13, that is, a position at a right upper corner of the rear panel 13 in FIGS. 3 and 4), thus, movement of the right rear folding tab 17 in a width direction (movement toward the outside of the box) is effectively prevented.

(35) FIGS. 8 to 12 illustrate a second embodiment of the assembly-type packaging box.

(36) Although the cuboid-shaped packaging box that is long in the width direction is formed in the above-described first embodiment, the packaging box formed in a cuboid shape that is long in the depth direction is formed in the second embodiment.

(37) Further, the second embodiment is configured such that a frame is also formed by an upper-edge panel at an opening portion on a front surface side of a box in addition to right and left frames formed by an upper-edge panel at right and left opening portions of the box.

(38) FIGS. 8 and 9 illustrate a development sheet 2 of the assembly-type packaging box in a front view and a perspective view, and the development sheet 2 illustrated in this example is formed by performing punching on a tab of synthetic paper. Further, broken lines denoted by reference numerals 39 and 40 among broken lines expressed in FIGS. 8 and 9 are mountain fold lines of 90 degrees, and the other broken lines without reference numerals indicate valley fold lines of 90 degrees.

(39) Incidentally, parts having the same functions as the portions illustrated in FIGS. 1 to 7, which have already been described, are denoted by the same reference numerals in FIGS. 8 to 12.

(40) A description will be given according to an assembly sequence illustrated in FIGS. 10 to 12.

(41) As illustrated in FIG. 10, the rear panel 13 is folded into the state of being erected with the rectangular-shaped bottom panel 11 of the development sheet 2 as the center. Further, each of the left and right rear folding tabs 16 and 17 connected to the rear panel 13 is folded across the valley fold line.

(42) Subsequently, the left outer panel 18, the left upper-edge panel 19, and the left inner panel 20 are folded in order. At this time, a front left second folding tab 34 formed on a side of the left inner panel 20 is folded along the mountain fold line 39. Accordingly, the left outer panel 18, the left upper-edge panel 19 and the left inner panel 20 cover the left-rear folding tab 16, and the left upper-edge panel 19 is formed on the left side of the box so as to be positioned in a frame shape.

(43) At this time, the left folding protrusion 20b formed on the side of the left inner panel 20 is disposed by being folded inward so as to be positioned directly below the left upper-edge panel 19. The left folding protrusion 20b is formed in an arc shape across a valley fold line at a position approaching (adjacent) to the left upper-edge panel 19 on a side facing the rear side of the left inner panel 20.

(44) Similarly, the right outer panel 21, the right upper-edge panel 22, and the right inner panel 23 are folded in order. At this time, a front right second folding tab 36 formed on a side of the right inner panel 23 is folded across the mountain fold line 40. Accordingly, the right upper-edge panel 22 is formed on the right side of the box so as to be positioned in a frame shape.

(45) At this time, similarly, the right folding protrusion 23b formed on the side of the right inner panel 23 is disposed by being folded inward so as to be positioned directly below the right upper-edge panel 22. Incidentally, the right folding protrusion 23b is formed in an arc shape across a valley fold line at a position approaching (adjacent) to the right upper-edge panel 22 at a side facing the rear side of the right inner panel 23.

(46) Although the example shown in FIG. 10 illustrates the right outer panel 21, the right upper-edge panel 22, and the right inner panel 23 are folded beforehand, there is no problem even if the folding order of the right and left is reversed.

(47) Subsequently, a front left first folding tab 33 and a front right first folding tab 35 are folded along the valley fold lines so that a state where the front left second folding tab 34 is superimposed on the left first folding tab 33 is formed. In addition, a state where the front right second folding tab 36 is superimposed on the front right first folding tab 35 is formed.

(48) In this state, the front panel 12, the front upper-edge panel 31, and the front inner panel 32 are folded in order. Accordingly, the left and right first folding tabs 33 and 35 and the left and right second folding tabs 34 and 36 are covered by the front panel 12, the front upper-edge panel 31, and the front inner panel 32, and the box is formed such that the front upper-edge panel 31 is positioned in a frame shape at the front side of the box as shown in FIG. 11. Therefore, the packaging box in which the frame having a predetermined width is formed on opening edges on the right and left sides and the front side of the box.

(49) In the state shown in FIG. 11, it is possible to assemble a cuboid-shaped packaging box 2A that is long in the depth direction, shown in FIG. 12, by sequentially folding the top panel 24 and the front cover panel 27 such that a locking tab 37 formed at an end side of the front cover panel 27 is inserted into a locking tab insertion hole 38 formed at a boundary between the bottom panel 11 and the front panel 12.

(50) Incidentally, each action of the left folding protrusion 20b formed on the left inner panel 20 and the right folding protrusion 23b formed on the right inner panel 23 in the second embodiment are the same as those of the first embodiment, which has been described with reference to FIGS. 6 and 7, and it is also possible to obtain the same action and effect in this second embodiment.

(51) Although both the left and right folding protrusions 20b and 23b are formed in the arc shape in the above-described embodiments, any shape such as a trapezoidal shape and a polygonal shape can be adopted for those protrusions.