JP6395596B2 - Box container and sheet-like member for box container - Google Patents

Description

  The present invention relates to an assembly-type box container and a sheet-like member assembled to the box container.

  Various box containers have been proposed that are assembled by appropriately folding paper or the like punched into a predetermined shape.

  For example, in Patent Document 1, a floor wall defined by a first fold line pair parallel to each other with a distance L1 and a second fold line pair parallel to each other with a distance L2 and a first fold line pair are provided. There is disclosed a packaging box having a first pair of sidewalls that are continuous via a second pair of sidewalls that are continuous via a second pair of fold lines. The packaging box described in Patent Document 1 includes a pair of lid-stopping flaps that continue to each of the second side wall pair via a fifth fold line pair, and a sixth side wall pair. And two pairs of insert flaps continuous through a pair of folding lines.

  Further, in Patent Document 1, two pairs of cuts provided in an intermediate portion in the vicinity of both end portions of the fifth fold line pair and projections provided on each side edge portion of two pairs of intermediate flaps are mutually connected. It is described that a second locking means for engaging and preventing the opening of the second pair of side walls is provided.

JP 2000-53119 A

  In the packaging box described in Patent Document 1, when the cut and the protrusion are engaged, the tip of the protrusion comes into contact with the lid stopper flap and receives a strong force from the lid stopper flap. As a result, in the packaging box described in Patent Document 1, when engaging the notch and the protrusion, the protrusion is likely to be bent because the protrusion is bent or the protrusion is bent.

  In the packaging box described in Patent Document 1, it is considered structurally difficult to engage the notch and the protrusion so as not to receive or weaken a strong force from the lid flap. Even if this is possible, there is a high possibility that it will be very time-consuming. Also, if the protrusion becomes fragile, it is usually very difficult to insert the protrusion into the notch.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a box container that can be easily assembled.

In order to achieve the above object, a box container according to the present invention comprises:
A bottom having a continuous first side and a second side;
A first side wall and a second side wall that extend upward from each of the first side and the second side, thereby adjacent to each other;
A first side flap connected to one side end of the first side wall and facing the inner surface of the second side wall;
A first locking piece extending from the first side flap and protruding upward from the upper end of the second side wall;
A first upper flap connected to the second side wall and extending above the first side flap;
The first upper flap is
A first locking slit into which the first locking piece is inserted, thereby locking the first locking piece;
Have a before Symbol first flexible portion formed by notches connected to the first locking piece said first locking slit extending in pairs in the width or spacing,
The first locking slit has a width wider than the width of the first locking piece,
The first flexible portion protrudes from the tip and closes a part of the first locking slit, whereby the first locking piece is the first side wall portion and the second side wall portion. And a protrusion for restricting movement in a direction in which they are separated from each other .

According to the present invention, the first flexible portion is formed in the first upper flap by a notch that extends in pairs at intervals equal to or larger than the width of the first locking piece and is connected to the first locking slit. Has been. Since each of the pair of cuts is connected to the first locking slit, one end of the first flexible portion located between the cuts is a free end that is movable with respect to the upper flap. And the other is a fixed end fixed to the upper flap.

  Therefore, when the operator who assembles the box container bends the first upper flap inward while bringing the first locking piece into contact with the first flexible portion, the first flexible portion is It bends by the force received from the locking piece. As a result, the force received by the first locking piece from the first flexible portion when the first locking piece is inserted into the first locking slit is formed by the first flexible portion on the upper flap. If not, the force that the first locking piece receives from the first upper flap is smaller. As a result, the first locking piece can be prevented from becoming fragile when the first locking piece is inserted into the first locking slit.

  Further, the first locking piece is pushed toward the first locking slit by the reaction force from the first flexible portion that is bent when inserted into the first locking slit. Therefore, when the first locking piece is inserted into the first locking slit, the first flexible portion can move the first locking piece to the first locking slit.

  In this way, the first flexible portion prevents the first locking piece from becoming brittle when the first locking piece is inserted into the first locking slit, and the first The locking piece can be moved to the first locking slit. Therefore, the box container can be easily assembled.

It is a perspective view in the state where the lid of the box container concerning one embodiment of the present invention was closed. It is a perspective view in the state where the lid of the box container concerning one embodiment was opened. It is an expansion perspective view of the vicinity of the locking piece and locking slit which concern on one embodiment. It is a figure which shows an example of the blank for assembling the box container which concerns on one Embodiment. It is a figure which shows the 1st state in the middle of assembling the box container which concerns on one embodiment. It is a figure which shows the 2nd state in the middle of assembling the box container which concerns on one embodiment. It is the figure which looked at the box container in the 2nd state from the left. It is a figure which shows the process of inserting a latching piece in a latching slit in the middle of assembling the box container which concerns on one embodiment. It is a perspective view in the state where the lid of the box container concerning modification 2 was opened. It is a figure which shows an example of the blank for assembling the box container which concerns on the modification 2. As shown in FIG. It is a perspective view in the state where the lid of the box container concerning modification 3 was opened. It is a figure which shows an example of the blank for assembling the box container which concerns on the modification 3. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are denoted by the same reference symbols throughout the drawings. The terms before, after, left, right, top, and bottom used in the description of the embodiments are used to indicate directions and are not intended to limit the present invention.

  A box container 100 according to an embodiment of the present invention is generally a rectangular parallelepiped as shown in a perspective view with the lid portion 116 of FIG. 1 closed and a perspective view with the lid portion 116 of FIG. 2 opened. This is a box-shaped container. In FIG. 2, a part of the lid 116 is cut away.

  The box container 100 is assembled by bending a sheet-like member. Generally, the bottom container 101, the side walls 102 to 105, the side flaps 106 to 109, the locking pieces 110 to 113, and the upper flap 114 are assembled. , 115, a lid portion 116, and a lid stopper flap 117. The box container 100 according to the present embodiment is configured symmetrically with respect to the left and right, that is, symmetrically with respect to the plane defined in the front-rear direction and the up-down direction (front-rear-upper-lower plane).

  When the box container 100 shown in FIG. 1 is viewed from above, the bottom 101 has a front side (front side), a left side (left side), a rear side (rear side), and a right side (right side). And a rectangle having four sides at the outer edge. Therefore, the bottom 101 according to the present embodiment has four sets of continuous sides (front side and left side, left side and rear side, rear side and right side, right side and front side).

  For example, the front side, the left side, the back side, and the right side according to the present embodiment can be considered to correspond to the first side, the second side, the third side, and the fourth side, respectively. The bottom 101 is not limited to a rectangle or a rectangle. The bottom 101 may have a shape having at least one set of continuous sides (first side and second side).

  The side walls 102 to 105 are respectively connected to the front side, the left side, the rear side, and the right side of the bottom 101 and extend upward from each of the front side, the left side, the rear side, and the right side of the bottom portion 101. Thereby, the upper ends of the side wall portions 102 to 105 form openings at the top.

  In the present embodiment, the side walls 102 to 105 are generally rectangular when viewed from the normal direction. The front side wall 102 and the left side wall 103 extend upward adjacent to each other from the front side and the left side, which are continuous sides of the bottom 101. Similarly, the left side wall portion 103 and the rear side wall portion 104, the rear side wall portion 104 and the right side wall portion 105, and the right side wall portion 105 and the front side wall portion 102 have continuous sides. Each of (left side and rear side, rear side and right side, right side and front side) is adjacent to each other and extends upward.

  Therefore, in the side wall parts 102 to 105 according to the present embodiment, the front side wall part 102 and the rear side wall part 104 are opposed to each other, and the left side wall part 103 and the right side wall part 103 are opposed to each other. 105 and a pair are opposed to each other.

  For example, the front side wall portion 102, the left side wall portion 103, the rear side wall portion 104, and the right side wall portion 105 according to the present embodiment are respectively a first side wall portion and a second side wall portion. It can be considered that this corresponds to the third side wall and the fourth side wall.

  The side flaps 106 to 109 are connected to the front side wall part 102 or the rear side wall part 104 which is one of the adjacent side wall parts 102 and 103, 103 and 104, 104 and 105, 105 and 102. ing. Further, the side flaps 106 to 109 are the left side wall part 103 or the right side wall part which is the other side wall part of the adjacent side wall parts 102 and 103, 103 and 104, 104 and 105, 105 and 102. It faces the inner surface of 105.

  Specifically, the left front side flap 106 is a left side end (left end) of left and right side ends of the front side wall 102 (one of the adjacent side walls 102 and 103). ) And extends backward from the left end. The outer surface (main surface facing left) of the two main surfaces of the side flap 106 is the inner surface of the left side wall portion 103 (the other side wall portion of the adjacent side wall portions 102 and 103). It faces the main surface facing to the right.

  Here, the front side wall portion 102 and the left side wall portion 103 are connected to continuous sides of the bottom portion 101 and extend upward adjacent to each other, and the left front side flap 106 is formed of the front side wall portion. 102 is connected to the left end. Therefore, the outer surface of the left front side flap 106 and the inner surface of the left side wall portion 103 are generally in contact with each other, or a part or all of each is positioned with a slight gap. The clearance may be, for example, as long as an object accommodated in the box container 100 does not go outside.

  The left rear side flap 107 is connected to the left side end (left end) of the left and right side ends of the rear side wall portion 104 (one of the adjacent side wall portions 103 and 104). It extends forward from its left end. The outer surface (main surface facing left) of the two main surfaces of the side flap 107 is the inner surface of the left side wall portion 103 (the other side wall portion of the adjacent side wall portions 103 and 104). It faces the main surface facing to the right.

  The outer surface of the left rear side flap 107 and the inner surface of the left side wall 103 are generally the same as the outer surface of the left front side flap 106 and the inner surface of the left side wall 103 described above. Or a part or all of each is positioned with a slight gap.

  The right front side flap 108 and the right rear side flap 109 are configured such that the left front side flap 106 and the left rear side flap 107 described above are symmetrically arranged with respect to the front-rear-upper and lower surfaces, respectively. Is provided. That is, the right front side flap 108 has a configuration in which the left and right sides are substantially interchanged in the description of the left front side flap 106 described above. In addition, in the description regarding the right rear side flap 109 and the left rear side flap 107 described above, a configuration in which the left and right sides are substantially interchanged is provided.

  In addition, for example, the left front side flap 106, the left rear side flap 107, the right front side flap 108, and the right rear side flap 109 according to the present embodiment are respectively the first side side flap. It can be considered to correspond to a flap, a second side flap, a third side flap, and a fourth side flap.

  The locking pieces 110 to 113 are extended upward from the upper ends of the side flaps 106 to 109, respectively. The left front locking piece 110 and the left rear locking piece 111 protrude upward from the upper end of the left side wall portion 103 opposed to the side flaps 106, 107. The right front locking piece 112 and the right rear locking piece 113 protrude upward from the upper end of the right side wall portion 105 in contact with the side flaps 108, 109 respectively extending.

  In the present embodiment, an example in which one locking piece 112, 113 is provided on each of the side flaps 108, 109 will be described. However, the locking pieces 112, 113 are provided on the side flaps 108, 109. One or more may be provided for each. For example, two or more locking pieces 112 and 113 may be provided on each of the side flaps 108 and 109.

  Specifically, the left front locking piece 110 is a small rectangular piece as viewed from the left, protruding upward including the rear end of the upper end of the left front side flap 106. The left rear locking piece 111 is a small rectangular piece that protrudes upward including the front end of the upper end of the left rear side flap 107 as viewed from the left.

  Both the left front locking piece 110 and the left rear locking piece 111 are rectangular as described above. Therefore, in the left front locking piece 110, the front side end (front end) is formed perpendicular to the upper end of the left front side flap 106 from which the left front locking piece 110 is extended. . Further, in the left rear locking piece 111, the rear side end (rear end) is formed perpendicular to the upper end of the left rear side flap 107 on which the left rear locking piece 111 is extended. Yes.

  Here, the front end of the left front locking piece 110 and the rear end of the left rear locking piece 111 are respectively the front and rear side ends of the locking pieces 110, 111, respectively. It is a side end close to the side wall portions 102 and 104 to which the extended side flaps 106 and 107 are connected.

  The right front locking piece 112 and the right rear locking piece 113 are configured such that the left front locking piece 110 and the left rear locking piece 111 are arranged symmetrically with respect to the front-rear and top-bottom surfaces, respectively. Is provided. That is, the right front locking piece 112 has a configuration in which the left and right sides are substantially interchanged in the description of the left front locking piece 110. In addition, the left and right engaging pieces 113 and the left rear engaging piece 111 described above have a configuration in which the left and right sides are substantially interchanged.

  Note that, for example, the left front locking piece 110, the left rear locking piece 111, the right front locking piece 112, and the right rear locking piece 113 according to the present embodiment are respectively the first locking pieces. It can be considered to correspond to a piece, a second locking piece, a third locking piece, and a fourth locking piece.

  The upper flaps 114 and 115 are connected to the left side wall part 103 or the right side wall part 105 which is the other side wall part of the adjacent side wall parts 102 and 103, 103 and 104, 104 and 105, and 105 and 102. doing.

  The left upper flap 114 extends above the left front side flap 106 and the left rear side flap 107. The right upper flap 115 is provided to extend above the right front side flap 108 and the right rear side flap 109. For example, the left upper flap 114 and the right upper flap 115 according to the present embodiment can be considered to correspond to a first upper flap and a second upper flap, respectively.

  Specifically, the left upper flap 114 has two locking slits 118 and 119 and two flexible portions 122 and 123, and the right upper flap 115 has two locking slits 120 and 121. And two flexible parts 124 and 125.

  The locking slits 118 to 121 are holes provided in association with the locking pieces 110 to 113 so that the locking pieces 110 to 113 are inserted, respectively, and are generally rectangular when viewed from above.

  The widths of the locking slits 118 to 121 are wider than the widths of the locking pieces 110 to 113 to be inserted, respectively, and have a gap in the width direction in a state where the locking pieces 110 to 113 are inserted.

  For example, the width of the locking slit 118 corresponds to a length obtained by adding 2 to 3 times the height of the locking piece 110 to the width of the locking piece 110 to be inserted. In this case, the gap that the locking slit 118 has in the width direction with the locking piece 110 inserted is two to three times the height of the locking piece 110. Here, the height of the locking piece 110 corresponds to a length in which the inserted locking piece 110 protrudes upward from the upper end of the side flap 106. The same may be said of the width | variety of the latching slits 111-113.

  The length of each of the locking slits 118 to 121 in the thickness direction is larger than the thickness of the locking pieces 110 to 113, respectively. For example, the length of the locking slit 118 in the thickness direction is about twice the thickness of the locking piece 110. The same applies to the lengths of the locking slits 119 to 121 in the thickness direction.

  Here, the width | variety of the latching slits 118-121 means the length of the longitudinal direction of the latching slits 118-121, respectively, and is the length of the front-back direction in this Embodiment. The length in the thickness direction of the locking slits 118 to 121 means the length in the short direction of the locking slits 118 to 121, and is the length in the left-right direction in the present embodiment.

  Further, the width of the locking pieces 110 to 113 is the direction corresponding to the direction in which the locking pieces 110 to 113 project (upward) and the thickness direction (the thickness of the sheet-like member that is the material of the box container 100). In the present embodiment, it means the length in the direction perpendicular to the left-right direction), and in this embodiment, it is the length in the front-rear direction.

  The locking pieces 110 to 113 inserted into the locking slits 118 to 121 are limited in the range of movement in the front / rear and left / right directions by the portion surrounding the locking slits 118 to 121, and as a result, Locked in.

  More specifically, the portion surrounding each of the left front locking slit 118 and the left rear locking slit 119 is the left upper flap 114 on the right side, the front side, and the rear side, and the left side is the left side. This is the side wall portion 103. The part surrounding each of the right front locking slit 120 and the right rear locking slit 121 is the left upper flap 115 on the left, the front, and the rear, and the right side wall 105. It is.

  For example, the left front locking slit 118, the left rear locking slit 119, the right front locking slit 120, and the right rear locking slit 121 according to the present embodiment are respectively the first locking. It can be considered to correspond to a slit, a second locking slit, a third locking slit, and a fourth locking slit.

  The flexible portions 122 and 123 extend in pairs in the direction intersecting the left side wall portion 103, respectively, and are respectively formed in the locking slits 118 and 119 at intervals greater than the width of the locking pieces 110 and 111. Formed by connecting cuts. The flexible portions 124 and 125 extend in pairs in the direction intersecting the right side wall portion 105, respectively, and are respectively formed in the locking slits 120 and 121 at intervals greater than the width of the locking pieces 112 and 113. Formed by connecting cuts.

  In the present embodiment, the notches forming each of the left front flexible portions 122 extend in parallel in pairs on the left and right sides, and are connected to both ends of the locking slit 118 in the width direction. The flexible parts 123 to 125 are similarly configured.

  As a result, the left front flexible portion 122 and the left rear flexible portion 123 are fixed ends supported by the right end portion being fixed, and the left end portion (tip portion) is a free end. The right front flexible portion 124 and the right rear flexible portion 125 are fixed ends supported by the left end portion being fixed, and the right end portion (tip portion) is a free end. Therefore, each of the flexible portions 122 to 125 can be easily bent so as to change the position of the tip portion in the vertical direction.

  The flexible portions 122 to 125 have protrusions 126 to 129 that block at least a part of gaps in the width direction of the locking slits 118 to 121 in a state where the locking pieces 110 to 113 are inserted, respectively.

  Specifically, the left front protrusion 126 and the left rear protrusion 127 are respectively the end (front end) near the front side wall 102 and the rear side wall 104 of the front ends of the flexible parts 123 and 124. It protrudes including the end (rear end) close to.

  As a result, the left front protrusion 126 is connected to the left side wall 103 to which the left upper flap 114 having the left front protrusion 126 is connected, and the front side wall 102 associated with the left front protrusion 126. The movement of the left front locking piece 110 in the direction in which the two are separated is restricted. The left rear protrusion 127 includes a left side wall 103 connected to a left upper flap 114 having a left rear protrusion 127, and a rear side wall 104 associated with the left rear protrusion 127. Restricts the movement of the left rear locking piece 111 in the direction of separating.

  Here, the left front protrusion 126 and the front side wall 102 are a left front side flap in which a locking piece 110 that is locked by a locking slit 118 that is closed by the left front protrusion 126 is extended. It is related as a side wall part to which 106 connects. Further, the left rear protrusion 127 and the rear side wall 104 have a left front side flap 106 in which a locking piece 111 locked by a locking slit 119 closed by the left rear protrusion 127 is extended. Are connected as side wall portions to be connected.

  The right front projecting portion 128 and the right rear projecting portion 129 each have a configuration in which the left front projecting portion 126 and the left rear projecting portion 127 are arranged symmetrically with respect to the front-rear and top-bottom surfaces. In other words, the right front protrusion 128 has a configuration in which the left and right are substantially interchanged in the description of the left front protrusion 126 described above. In addition, in the description regarding the right rear protrusion 129 and the left rear protrusion 127 described above, a configuration in which the left and right are substantially interchanged is provided.

  For example, the left front flexible part 122, the left rear flexible part 123, the right front flexible part 124, and the right rear flexible part 125 according to the present embodiment are each a first flexible part. It can be considered that it corresponds to a part, a second flexible part, a third flexible part, and a fourth flexible part.

  The lid portion 116 is connected to the upper end of at least one side wall portion 104 among the plurality of side wall portions 102 to 105. The cover part 116 closes the upper part of the opening formed by the upper ends of the plurality of side wall parts 102 to 105. For example, in order to assemble the box container 100 from a single punched sheet-like member, the lid portion 116 is desirably connected to the upper end of the side wall portion to which the upper flaps 114 and 115 are not connected. Connect to the upper end of the rear side wall 104.

  The lid stopper flap 117 is extended from the tip of the lid portion 116. The lid stopper flap 117 has an insertion piece 130 formed by cutting so as to swing back and forth about the left and right axes.

  In the present embodiment, the insertion piece 130 is formed by a notch that extends to the left and right at the approximate center in the left-right direction, and a notch that extends downward from the both ends of the notch so as to increase the distance between the left and right sides. .

  The front side wall part 102 which is a side wall part facing the rear side wall part 104 to which the lid part 116 is connected has an insertion port 131 into which the insertion piece 130 is inserted and locked. The insertion slot 131 according to the present embodiment is formed by a cut extending substantially to the left and right. As a result, an opening extending substantially to the left and right can be formed in the front side wall portion 102, so that the insertion piece 130 is locked to the insertion opening 131 by inserting the insertion piece 130 into the opening of the insertion opening 131. Is done.

  The lid flap 117 is provided with a crease passing through the lower end of the cut extending downward, whereby the lid flap 117 can be easily swung. In addition, the front side wall 102 is provided with a notch extending downward while tilting toward the center from both ends of the left and right notches, and a fold line connecting the lower ends of the notches. Thereby, the opening of the insertion port 131 can be easily opened. Accordingly, the insertion piece 130 can be easily inserted into the insertion port 131.

  So far, the configuration of the box container 100 according to the embodiment of the present invention has been described. From here, an example of an assembly method of the box container 100 according to the present embodiment will be described.

  The box container 100 according to the present embodiment is assembled by, for example, bending a blank 132 punched out in a shape as shown in FIG. 4 according to a predetermined procedure.

  The blank 132 is paper punched into a predetermined shape, and film adhesion, coating, and the like may be appropriately applied. For example, PET (polyethylene terephthalate) may be laminated to paper, and aluminum may be deposited on PET with a thickness of about 50 to 150 mm. From the viewpoint of ease of assembly such as folding and locking, strength of the assembled box container 100, and the like, for example, paper of about 260 to 270 g / m 2 is suitably employed. By providing a vapor deposition layer of aluminum or the like on the inner surface of the box container, for example, when food is placed in the box container 100 and heated in a microwave oven, the food inside can be burnt.

  In addition, the member assembled to the box container 100 should just be a sheet-like thing, For example, it is good also considering resin as the main material.

  The blank 132 is preferably provided with a fold so that it can be easily folded at a predetermined location. In FIG. 4, a fold provided by a linear press is represented by a thin line, and a fold provided by a notch provided by a broken line is represented by a dotted line. In addition, how to make a crease is not limited to this, and a half cut or the like may be employed as appropriate.

  The blank 132 is bent at each side of the bottom 101 extending left and right so that each of the front side wall 102 and the rear side wall 104 rises upward with respect to the bottom 101.

  The blank 132 is bent at each side end of the front side wall portion 102 on the left and right so that each of the left front side flap 106 and the right front side flap 108 faces rearward. Further, the blank 132 is bent at each side end of the rear side wall portion 104 on the left and right so that the left rear side flap 107 and the right rear side flap 109 are directed forward. As a result, the blank 132 is in the first state shown in FIG.

  The blank 132 is bent at each side extending in the front-rear direction of the bottom 101 so that each of the left side wall 103 and the right side wall 105 is raised upward with respect to the bottom 101. As a result, the blank 132 is in the second state shown in FIG. As shown in the figure, in the second state, a box-like box container 100 in which an internal space is substantially formed by the bottom portion 101 and the four side wall portions 102 to 105 is formed.

  Here, FIG. 7 is the figure which looked at the box container 100 of the 2nd state shown in FIG. 6 from the left. In the present embodiment, the widths of the locking slits 118 and 119 correspond to the widths of the flexible portions 122 and 123. As shown in the figure, the widths of the locking slits 118 and 119 are the locking pieces 110 and 111, respectively. Wider than the width of. That is, the locking slits 118 and 119 have a gap in the width direction in a state where the locking pieces 110 and 111 are inserted as described above. By providing this gap, the locking pieces 110 and 111 are inserted into the locking slits 118 and 119 even if the front and rear positions of the locking pieces 110 and 111 are not accurately fixed to the positions shown in FIG. be able to. Therefore, the box container 100 can be easily assembled.

  In the box container 100 in the second state, the right side wall portion 105, the right upper flap 115, the right front side flap 108 and the locking piece 112, the right rear side flap 109 and the locking piece. The positional relationship such as 113 is substantially symmetric with respect to FIG.

  The left upper flap 114 of the box container 100 in the second state shown in FIG. 6 is folded inside the box container 100 with the upper end of the left side wall 103 as a fold. Specifically, the left upper flap 114 has a boundary with the left side wall portion 103 so as to sandwich the left front and left rear side flaps 106 and 107 between the left side wall portion 103, that is, The left side wall 103 is bent at the upper end.

  As a result, the left front and left rear locking slits 118 and 119 are formed, and the locking pieces 110 and 111 are inserted into the formed locking slits 118 and 119, respectively.

  Further, by positioning the front and rear positions of the locking pieces 110 and 111 at the positions shown in FIG. 7, the left and right movements of the locking pieces 110 and 111, the rearward movement of the left front locking piece 110, The forward movement of the left rear locking piece 111 is locked at a portion surrounding the locking slits 118 and 119. At the same time, the forward movement of the left front locking piece 110 is limited by the left front protrusion 126, and the rear movement of the left rear locking piece 111 is limited by the left rear protrusion 127. .

  Here, with reference to FIGS. 8A to 8E, a process of inserting the left front locking piece 110 into the left front locking slit 118 will be described. The left rear locking piece 111 is also inserted into the left rear locking slit 119 at substantially the same time as the left front locking piece 110, as indicated by reference numerals in parentheses in the following description.

  Fig.8 (a) is sectional drawing in the II line of the box container 100 of the 2nd state shown in FIG. A force in the direction indicated by the arrow in FIG. 8A is applied to the left upper flap 114. As a result, as shown in FIG. 8B, the upper flap 114 on the left side is tilted to the right, and the flexible portion 122 (123) is pushed by the locking piece 110 (111) to bend upward. The stop piece 110 (111) and the side flap 106 (107) on which the stop piece 110 (111) extends are bent rightward by a reaction force from the flexible portion 122 (123).

  Further, when a force in the direction indicated by the arrow in FIG. 8B is applied to the left upper flap 114, the flexible portion 122 (123) is moved to the locking piece 110 (see FIG. 8C). 111) and is greatly bent upward, and the rightward bending of the locking piece 110 (111) and the side flap 106 (107) on which the locking piece 110 is extended is also increased.

  At this time, as shown in FIG. 7, the upper end of the left side wall portion 103 includes two concavo-convex portions composed of a portion recessed downward and a portion protruding upward. When the left upper flap 114 faces rightward, the concavo-convex portions become locking slits 118 and 119 of the left upper flap 114, respectively. At the same time, the recessed portion at the upper end of the left side wall 103 is continuously connected to the distal ends of the flexible portions 122 and 123 as projecting portions 126 and 127 having complementary shapes.

  Further, since the bending of the flexible portion 122 (123) is large, the reaction force from the flexible portion 122 (123) pushes the locking piece 110 (111) to the left. Therefore, the flexible portion 122 (123) moves the locking piece 110 (111) to the locking slit 118 (119). Thus, the locking piece 110 (111) is easily guided to the locking slit 118 (119). Since the flexible portion 122 (123) is bent, the force applied to the locking piece 110 (111) from the flexible portion 122 (123) is weakened, and thus the locking portion 110 (111) is weakened by bending. Is unlikely.

  Then, as shown in FIG. 8D, when the left upper flap 114 is largely bent inward, the locking piece 110 (111) is inserted into the locking slit 118 (119). At this time, the force applied to the flexible portion 122 (123) that is greatly bent is suddenly lost and returns to a substantially flat state, so that a sound of clicking the flexible portion 122 (123) to be assembled, a click feeling, and the like are generated. Thereby, the operator who assembles the box container 100 knows that the locking piece 110 (111) is inserted into the locking slit 118 (119).

  Here, the width of the locking slit 118 (119) is wider than the width of the locking piece 110 (111) as described above. Therefore, for example, even if the locking piece 110 and the locking piece 110 are separated from each other in the front-rear direction from the completed position (for example, see FIG. 3), the locking pieces 110 and the locking slits 119 respectively. Inserted. Thereby, the locking piece 110 (111) can be easily inserted into the locking slit 118 (119).

  Each of the locking piece 110 and the locking piece 111 is preferably inserted into the locking slit 118 and the locking slit 119, and then the position of the locking piece 110 and the locking piece 111 in the front-rear direction is adjusted. . Specifically, the locking piece 110 may be adjusted so as to be positioned behind the protrusion 126 in the locking slit 118. The locking piece 111 may be adjusted so as to be positioned in front of the protrusion 127 in the locking slit 119.

  The locking piece 110 and the locking piece 111 are connected to the left front side flap 106 and the left rear side flap 107, respectively. Therefore, the front-rear direction positions of the locking piece 110 and the locking piece 111 can be easily adjusted by adjusting the distance between the front side wall portion 102 and the rear side wall portion 104.

  As shown in FIG. 8E, the position of the left upper flap 114 is corrected so that the left upper flap 114 faces substantially rightward. Thus, the process of inserting the left front locking piece 110 into the left front locking slit 118 ends.

  In addition, the process of inserting the locking pieces 110 and 111 into the locking slits 118 and 119 may be appropriately changed according to, for example, the strength of the blank 132 and the size of the box container 100. For example, the left front locking piece 110 and the left rear locking piece 111 may be sequentially inserted into the left front locking slit 118 and the left rear locking slit 119, respectively.

  Subsequently, the upper flap 115 on the right side of the box container 100 is moved to the right side toward the inner side of the box container 100 so as to sandwich the right front and right rear side flaps 108 and 109 between the right side wall portion 105. The side wall portion 105 is bent with the upper end as a fold. As a result, the right front and right rear locking pieces 113 are inserted into the right front and right rear locking slits 121, respectively. Details of this step are the steps of bending the left side wall 103 at the upper end and inserting the left front and left rear locking pieces 110 and 111 into the left front and left rear locking slits 118 and 119, respectively. In the above description, the left and right are generally interchanged.

  Then, by positioning the front and rear positions of the locking pieces 112 and 113 at a predetermined position (a position corresponding to the left and right symmetry of FIG. 7), the left and right movements of the locking pieces 112 and 113, The movement of the right front locking piece 112 to the rear and the movement of the right rear locking piece 113 to the front are locked by a portion surrounding the locking slits 120 and 121. At the same time, the forward movement of the right front locking piece 112 is restricted by the right front protrusion 128, and the rearward movement of the right rear locking piece 113 is restricted by the right rear protrusion 129. .

  The box container 100 is bent at the upper end of the rear side wall portion 104 so that the lid portion 116 closes the opening formed at the upper ends of the plurality of side wall portions 102 to 105. The box container 100 is folded at the front end of the lid portion 116 so that the lid stopper flap 117 is positioned in front of the front side wall portion. The insertion piece 130 is inserted into the insertion port 131, and the insertion piece 130 is locked to the insertion port 131. Thereby, the lid 116 is locked so as not to open, and the box container 100 is completed.

  According to this Embodiment, the flexible parts 122-125 are provided in the box container 100. FIG. Therefore, as described above, when the locking pieces 110 to 113 are inserted into the locking slits 118 to 121, the locking pieces 110 to 113 are prevented from becoming fragile, and the locking pieces 110 to 113 are engaged. It can be moved to the stop slits 118-121. Therefore, the box container 100 can be easily assembled.

  In the box container 100 according to the present embodiment, the locking pieces 110 to 113 are locked by the locking slits 118 to 121, so that the adjacent side wall portions 102 and 103, 103 and 104, 104 and 105, 105 and 102 are locked so as not to be separated from each other. Therefore, even if a force is applied from the inside, the adjacent side wall portions 102 and 103, 103 and 104, 104 and 105, 105 and 102 are difficult to open. Accordingly, it is possible to obtain the box container 100 having a high strength.

  Here, as an example in which a force is applied to the box container 100 from the inside, when bread dough is accommodated in the box container 100 and fermented, when the box container 100 containing the dough is heated in a microwave oven, the bread swells. Cases can be mentioned.

  According to the present embodiment, the protruding portions 126 to 129 are provided in the box container 100. Accordingly, in order to facilitate the insertion of the locking pieces 110 to 113, the locking pieces 110 to 113 move within the locking slits 118 to 121 even if the width of the locking slits 118 to 121 is increased. The range to do can be limited. Therefore, it is possible to prevent the front or rear side walls 102 and 104 from being easily opened when a force from the inside is applied to the front or rear side walls 102 and 104 of the box container 100. Therefore, it is possible to increase the strength of the box container 100 while facilitating the assembly of the box container 100.

  In the embodiment, the front end of the left front locking piece 110, the rear end of the left rear locking piece 111, the front end of the right front locking piece 112, and the rear end of the right rear locking piece 113 are respectively In addition, the locking pieces 110 to 113 are formed perpendicular to the upper ends of the side flaps 106 to 109.

  As a result, the front ends of the left front locking piece 110 and the right front locking piece 112 are each formed at an obtuse angle with respect to the upper ends of the side flaps 106 and 108 (that is, upward while tilting backward). It is difficult to move the locking slits 118 and 120 even when the front side wall 102 receives a force from the inside. Similarly, the rear left engagement piece 111 and the rear end of the right rear engagement piece 113 are each formed at an obtuse angle with respect to the upper ends of the side flaps 107 and 109 (that is, forward). It is more difficult to move the locking slits 119 and 121 even when the rear side wall 104 receives a force from the inside than the case of extending upward while tilting.

  Therefore, the locking by the locking pieces 110 to 113 and the locking slits 118 to 121 is difficult to be released. Thereby, it can prevent opening easily by the force which the box container 100 receives from the inside. Accordingly, it is possible to obtain the box container 100 having a high strength.

  According to the present embodiment, the insertion piece 130 is inserted into the insertion port 131 and locked, and as a result, the lid 116 is locked so as not to open. At this time, since the front and rear side wall portions 102 and 104 are restrained via the lid portion 116, the front and rear side wall portions 102 and 104 are difficult to open even if a force is applied from the inside. Accordingly, it is possible to obtain the box container 100 having a high strength.

  The embodiment of the present invention has been described above. However, the present invention is not limited to this embodiment, and may be modified as follows, for example.

(Modification 1)
For example, in the embodiment, the front end of the left front locking piece 110, the rear end of the left rear locking piece 111, the front end of the right front locking piece 112, and the rear end of the right rear locking piece 113 are In the above description, an example in which the engaging pieces 110 to 113 are formed perpendicular to the upper ends of the side flaps 106 to 109 has been described.

  However, some or all of the front end of the left front locking piece 110, the rear end of the left rear locking piece 111, the front end of the right front locking piece 112, and the rear end of the right rear locking piece 113 are , Respectively, may be formed at an acute angle with respect to the upper ends of the side flaps 106 to 109 on which the locking pieces 110 to 113 are extended. That is, one or both of the front end of the left front locking piece 110 and the front end of the right front locking piece 112 may extend upward while inclining forward. One or both of the rear end of the left rear locking piece 111 and the rear end of the right rear locking piece 113 may extend upward while inclining backward.

  Accordingly, the front ends of the left front locking piece 110 and the right front locking piece 112 are difficult to move through the locking slits 118 and 120 even when the front side wall 102 receives a force from the inside. Further, the rear rear locking piece 111 and the rear end of the right rear locking piece 113 are difficult to move through the locking slits 119 and 121 even when the rear side wall 104 receives a force from the inside. Therefore, the locking by the locking pieces 110 to 113 and the locking slits 118 to 121 is difficult to be released. Therefore, it is possible to prevent the box container 100 from being easily opened by the force received from the inside.

(Modification 2)
For example, as shown in FIG. 9, which is a perspective view with the lid of the box container 200 open, each of the upper flaps 233 and 234 may be provided on the front side wall portion 102, and the upper flaps 214 and 215 may be provided. , 233, 234 may have one locking slit 218-221 and flexible portion 222-225. Further, side flaps 206 and 208 having locking pieces 210 and 212 may be provided on the left and right side wall portions 103 and 105, respectively.

  The locking pieces 210 and 212 are locked by being inserted into the locking slits 218 and 220, respectively. The locking pieces 111 and 113 are locked by being inserted into the locking slits 219 and 221, respectively. Is done. As a result, the adjacent side wall portions 102 and 103, 103 and 104, 104 and 105, 105 and 102 are locked so as not to open. In FIG. 9, a part of the lid part 116 is cut away. An example of the blank 232 for assembling the box container 200 according to this modification is shown in FIG. Also according to this modification, the same effects as those of the embodiment can be obtained.

  In this modification, for example, when viewing the front side wall 102 and the left side wall 103, the left side wall 103 to which the side flaps 206 are connected corresponds to the first side wall, and the upper side It can be considered that the front side wall 102 to which the flap 233 is connected corresponds to the second side wall.

  Further, for example, when the rear side wall 104 and the left side wall 103 are viewed, it can be considered that the rear side wall 104 and the left side wall 103 correspond to the first side wall and the second side wall, respectively. The side wall portion 105 can be considered to correspond to the first side wall portion and the second side wall portion, respectively. When the right side wall portion 105 and the front side wall portion 102 are viewed, It can be considered to correspond to the first side wall and the second side wall.

(Modification 3)
For example, as shown in FIG. 11 which is a perspective view with the lid of the box container 300 opened, two locking pieces are provided in one locking slit 318, 320 provided in each of the upper flaps 314, 315. 310, 311, 312 and 313 may be inserted, and thereby the locking pieces 310, 311, 312 and 313 may be locked.

  Specifically, as shown in FIG. 11, the box container 300 according to the present modification includes a bottom portion 101, side wall portions 102 to 105, an insertion port 131, a lid portion 116, and the like similar to the embodiment. The box container 300 includes side flaps 306 to 309, locking pieces 310 to 313, and upper flaps 314 and 315.

  The side flaps 306 to 309 are connected to the front side wall part 102 or the rear side wall part 104 and facing the inner surface of the side wall part 103 or the right side wall part 105 according to the embodiment. Similar to the side flaps 106-109. In addition, the side flaps 306 to 309 have locking pieces 110 to 113 extending upward from their upper ends in the same manner as the side flaps 106 to 109.

  The side flaps 306 to 309 are different in length in the front-rear direction from the side flaps 106 to 109 according to the embodiment, and are viewed from the side (left side or right side) as shown in FIG. The side flaps 306 and the side flaps 307 overlap each other, and the side flaps 308 and the side flaps 309 overlap each other.

  And each of the locking pieces 310-313 protrudes upward from the upper end of the side flaps 306-309 similarly to the locking pieces 110-113 which concern on embodiment. Further, each of the locking pieces 310 to 313 is the same as the locking pieces 110 to 113 according to the embodiment, the rear end of the left front side flap 306, the front of the left rear side flap 307, the right It is provided at a position including the rear end portion of the front side flap 308 and the front end portion of the right rear side flap 309.

  Therefore, the left front locking piece 310 and the left rear locking piece 311 are arranged in parallel to each other, and are at least one when viewed from the side (that is, the normal direction of the left side wall 103, for example). The parts overlap each other. Further, the right front locking piece 312 and the right rear locking piece 313 are arranged in parallel to each other, and are at least one when viewed from the side (for example, the normal direction of the right side wall portion 105). The parts overlap each other.

  The upper flaps 314 and 315 are connected to the left side wall portion 103 and the right side wall portion 105, respectively, similarly to the upper flaps 114 and 115 according to the embodiment. Similar to the upper flap 114 according to the embodiment, the upper flap 314 is provided to extend above the left front side flap 306 and the left rear side flap 307. Similar to the upper flap 115 according to the embodiment, the upper flap 315 extends above the right front side flap 308 and the right rear side flap 309.

  The upper flap 314 includes a locking slit 318, a flexible portion 322, and projecting portions 326 and 327 that are different from the upper flap 114 according to the embodiment. The upper flap 315 also includes a locking slit 320, a flexible portion 324, and projecting portions 328 and 329 that are different from the upper flap 115 according to the embodiment. Since the upper flap 315 is substantially symmetrical with the upper flap 314, the locking slit 318, the flexible portion 322, and the projecting portions 326 and 327 of the upper flap 314 will be described in detail in order to simplify the description. .

  The locking slit 318 is provided in association with the locking pieces 310 and the locking pieces 311 that overlap each other so that the locking pieces 310 and the locking pieces 311 that overlap each other are inserted as described above. It is a hole and is generally rectangular when viewed from above.

  The width of the locking slit 318 is wider than the entire width of the locking pieces 310 and 311 to be inserted, and has a gap in the width direction in a state where the locking pieces 310 and 311 are inserted.

  Here, the overall width of the locking pieces 310 and 311 is the length of the entire left and right of the locking pieces 310 and 311, and the side ends (front end and rear end) of each of the locking pieces 310 and 311. The distance in the front-rear direction between the side end closest to the front side wall 102 and the side end closest to the rear side wall 104.

  For example, the width of the locking slit 318 corresponds to a length obtained by adding two to three times the height of the locking pieces 310 and 311 to the entire width of the locking pieces 310 and 311 to be inserted. Is. In this case, the clearance that the locking slit 318 has in the width direction with the locking pieces 310 and 311 inserted is two to three times the height of the locking pieces 310 and 311 in the front and rear directions.

  The length of the locking slit 318 in the thickness direction is larger than the thickness of the overlapping portion of the locking pieces 310 and 311, and is, for example, about twice the thickness of the overlapping portion of the locking pieces 310 and 311.

  The locking pieces 310 and 311 inserted in the locking slit 318 are restricted in the range of movement in the front / rear and left / right directions by the portion surrounding the locking slit 318, and as a result, are locked in the locking slit 318. . More specifically, the portions surrounding the locking slit 318 are the left upper flap 314 on the right side, the front side, and the rear side, and the left side wall portion 103 on the left side.

  The flexible portions 322 extend in pairs in a direction intersecting the left side wall portion 103, and are formed by notches that connect to the locking slits 318 at intervals greater than the entire width of the locking pieces 310 and 311. It is formed. In this modification, the notches forming each of the flexible portions 322 extend in parallel in pairs on the left and right, and are connected to both ends of the locking slit 318 in the width direction.

  Thereby, the flexible part 322 becomes a fixed end where the right end part is fixed and supported, similarly to the flexible part 122 according to the embodiment, and the left end part (tip part) becomes a free end. Therefore, the flexible portion 122 can be easily bent so as to change the position of the tip portion in the vertical direction.

  The flexible portion 322 has protrusions 326 and 327 that block at least a part of the front and rear gaps of the locking slit 318 in a state where the locking pieces 310 and 311 are inserted.

  Specifically, the left front projecting portion 326 and the left rear projecting portion 327 are close to the front end portion of the flexible portion 322 (front end) and the rear side wall portion 104, respectively. It protrudes including the end (rear end).

  Accordingly, the left front protrusion 326 includes a left side wall 103 connected to a left upper flap 314 having a left front protrusion 326 and a front side wall 102 associated with the left front protrusion 326. The movement of the left front locking piece 310 in the direction in which the two are separated from each other is limited. The left rear protrusion 327 includes a left side wall 103 connected to a left upper flap 314 having a left rear protrusion 327, and a rear side wall 104 associated with the left rear protrusion 327. Restricts the movement of the left rear locking piece 311 in the direction of separating.

  For example, it can be considered that the locking slit 318 according to this modification corresponds to a first locking slit, and the flexible part 322 according to this modification corresponds to a first flexible part.

  An example of the blank 332 for assembling the box container 300 according to this modification is shown in FIG. Also according to this modification, the same effects as those of the embodiment can be obtained.

  Furthermore, according to this modification, two locking pieces 310 and 311 (312 and 313) are inserted into one locking slit 318 (320) and locked. Therefore, the number of locking slits 318 (320) and flexible portions 322 (324) provided in the upper flap 314 (315) can be reduced as compared with the embodiment. As a result, the box container 300 can have a simple configuration. Moreover, it becomes possible to reduce the process of the blank 332 for assembling the box container 300.

  Furthermore, according to this modification, at least a part of the locking pieces 310 and 311 (312 and 313) overlap. Thereby, the strength of the locking pieces 310 and 311 (312 and 313) can be increased. Therefore, even if the flexible portion 322 (324) abuts, the locking pieces 310 and 311 (312 and 313) are bent or bent, so that the locking pieces 310 and 311 (312 and 313) are bent. The possibility of becoming vulnerable can be reduced. Therefore, the box container 300 can be easily assembled.

(Modification 4)
For example, the lid 116 may be provided with a tear line extending in the left-right direction. By providing the cut line, the lid 116 can be separated forward and backward without unlocking the insertion piece 130. Therefore, the lid 116 can be easily opened.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

100, 200, 300 Box container 101 Bottom 102-105 Side wall 106-109, 206, 208, 306-309 Side flap 110-113, 210, 212, 310-313 Locking piece 114, 115, 214, 215 233, 234, 314, 315 Upper flap 116 Lid 117 Lid stopper flap 118-121, 218-221, 318, 320 Locking slit 122-125, 222-225, 322, 324 Flexible portion 126-129, 326- 329 Projection part 130 Insertion piece 131 Insertion port 132,232,332 Blank

Claims (8)

A bottom having a continuous first side and a second side;
A first side wall and a second side wall that extend upward from each of the first side and the second side, thereby adjacent to each other;
A first side flap connected to one side end of the first side wall and facing the inner surface of the second side wall;
A first locking piece extending from the first side flap and protruding upward from the upper end of the second side wall;
A first upper flap connected to the second side wall and extending above the first side flap;
The first upper flap is
A first locking slit into which the first locking piece is inserted, thereby locking the first locking piece;
Have a before Symbol first flexible portion formed by notches connected to the first locking piece said first locking slit extending in pairs in the width or spacing,
The first locking slit has a width wider than the width of the first locking piece,
The first flexible portion protrudes from the tip and closes a part of the first locking slit, whereby the first locking piece is the first side wall portion and the second side wall portion. Having protrusions that restrict movement in a direction away from each other,
Box container. Of the side ends of the first locking piece, the side end close to the first side wall is formed at a perpendicular or acute angle with respect to the upper end of the first side flap connected to the side end. The box container according to claim 1 . A plurality of side wall parts including the first side wall part and the second side wall part, connected to the bottom part and forming an opening in the upper part;
A lid portion that is connected to an upper end of the side wall portion facing the first side wall portion and closes the opening;
A lid stopper flap having an insertion piece extending from the tip of the lid portion and formed by cutting;
The first side wall portion of the plurality of side wall portions is formed by cutting, and the insertion piece is further inserted, thereby further including an insertion port for locking the insertion piece. The box container according to 1 or 2 . The bottom portion further includes a third side continuous with the second side,
The box container is
A third sidewall extending upwardly from the third side, thereby adjacent to the second sidewall, and
A second side flap connected to one side end of the third side wall and facing the inner surface of the second side wall;
A second locking piece extending to the second side flap and protruding upward from the upper end of the second side wall portion;
Both the first locking piece and the second locking piece are inserted into the first locking slit, thereby engaging the first locking piece and the second locking piece. Stop,
Said first flexible portion, the first of the side edge, each having between the the locking piece second locking pieces, the nearest side edge to the first side wall portion and the third The box container according to any one of claims 1 to 3 , wherein the box container is formed by a cut connected to the first locking slit at an interval equal to or more than a distance from a side end closest to the side wall. The first locking piece and the second locking piece are arranged in parallel to the second side wall portion, and at least a part thereof overlaps each other when viewed from the normal direction of the second side wall portion. Item 5. A container according to item 4 . The bottom portion is a quadrangle further including a third side connected to the second side, and a fourth side connected to the third side and the first side,
The box container is
A third sidewall extending upwardly from the third side, thereby adjacent to the second sidewall, and
A fourth sidewall extending upward from the fourth side, thereby adjacent to each of the third sidewall and the first sidewall ;
A second side flap connected to one side end of the third side wall and facing the inner surface of the second side wall;
A third side flap connected to the other side end of the first side wall and facing the inner surface of the fourth side wall;
A fourth side flap connected to the other side end of the third side wall and facing the inner surface of the fourth side wall;
A second locking piece extending to the second side flap and protruding upward from the upper end of the second side wall;
A third locking piece extending to the third side flap and protruding upward from the upper end of the fourth side wall;
A fourth locking piece extending to the fourth side flap and protruding upward from the upper end of the fourth side wall;
A second upper flap connected to the fourth side wall and extending above the third side flap and the fourth side flap;
The first upper flap is
A second locking slit into which the second locking piece is inserted, thereby locking the second locking piece;
Further comprising a second flexible portion formed by slits to be connected to said second locking slit in pairs extending in front Symbol width or spacing of the second locking piece,
The second upper flap is
A third locking slit into which the third locking piece is inserted, thereby locking the third locking piece ;
A fourth locking slit into which the fourth locking piece is inserted, thereby locking the fourth locking piece ;
A third flexible portion which is formed by the front Symbol notches connected to the third said extending in pairs in the width or spacing of engaging pieces of the third locking slit,
One of claims 1 and a fourth flexible portion which is formed by the front Symbol notches connected to the fourth said extending in pairs in the width or spacing of locking pieces of the fourth locking slit 3 The box container according to claim 1. The box container according to any one of claims 1 to 6 , wherein a vapor deposition layer is provided on an inner surface side. A bottom having a continuous first side and a second side;
A first side wall and a second side wall connected to each of the first side and the second side;
A first side flap connected to one side end of the first side wall;
The first side flap and the second side are extended at an end portion of the first side flap, and the first side wall portion and the second side wall portion are adjacent to each other. A first locking piece projecting upward from the upper end of the second side wall when bent at each side;
A first upper flap connected to an end portion of the second side wall portion opposite to the second side;
The first upper flap is
The first side wall and the second side wall are bent at each side of the first side and the second side so as to be adjacent to each other, and above the first side flap. When the first upper flap is bent so as to extend, the first locking piece is inserted, thereby locking the first locking piece;
The second side wall portion extends in a pair in a direction intersecting with the end portion to which the first upper flap is connected among the end portions of the second side wall portion, and the first locking piece has a width equal to or larger than the width of the first locking piece. possess a first flexible portion formed by notches connected to one of the locking slit,
The first locking slit has a width wider than the width of the first locking piece,
The first flexible part is bent at each side of the first side and the second side so that the first side wall part and the second side wall part are adjacent to each other; and When the first upper flap is bent so as to extend above the first side flap, it protrudes from the tip and closes a part of the first locking slit, whereby the first locking A protrusion that restricts movement of the piece in a direction in which the first side wall and the second side wall are separated from each other;
A sheet-like member for a box container.

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