JP2014043251A - Box body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box body that can prevent weight increase thereof and further increase allowable carrying capacity.SOLUTION: In the box body 10, first and second lateral edge reinforcement ribs 32 and 33 are arranged together on a lateral edge of each first lateral wall 30 so that buckling strength of each first lateral wall 30 is intensively enhanced at both lateral edges comprising a lateral wall engagement part 33K. A group of engagement protrusions 62 protruding from lateral part protrusion walls 54 and 54 on both sides of a second lateral wall 50 engage unevenly in a lateral engagement groove 34M composed of the first and second lateral edge reinforcement ribs 32 and 33 and a groove bottom wall 34 so that buckling strength of the second lateral wall 50 is intensively enhanced at both lateral edges comprising a lateral wall engagement part 59. This prevents engagement of the lateral wall engagement parts 33K and 59 from being carelessly detached, suppresses weight increase of the box body 10 itself accompanying the increase in strength and can further increase allowable carrying capacity of the box body 10.

Description

  In the present invention, a pair of first side walls and a remaining pair of second side walls that are opposed to each other are pivotally connected to the bottom base, and a pair of first side walls and a pair of second side walls are arranged in this order. Side wall locking provided in the side edges of the first side wall and the second side wall in the assembled state by standing up in the order of a pair of second side walls and a pair of first side walls The present invention relates to a box body in which a first side wall is locked in an upright state by engagement between portions.

  Conventionally, as this type of foldable box, one that is used as a storage box or one that is used as an exhibition stand with a lid attached or upside down is known (for example, Patent Document 1). reference).

Utility registration No. 3167129 (FIGS. 1, 2 and 9)

  By the way, in a foldable box, when a load exceeding the allowable load weight is received from above, the first side wall and the second side wall are buckled and deformed, and the engagement between the side wall locking portions is released, and the first side wall falls down. This can happen. On the other hand, in order to increase the allowable load weight, it is conceivable to increase the number of the plurality of vertical ribs distributed in the lateral direction of the first side wall and the second side wall, but simply increase the number of the vertical ribs. It is not preferable that the weight of the box itself is significantly increased.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a box that can suppress an increase in the weight of the box itself and increase the allowable load weight as compared with the conventional box.

  In order to achieve the above object, the box according to the invention of claim 1 has a rectangular parallelepiped shape whose upper surface is open, and a pair of first side walls facing each other and a remaining pair of second side walls in the rectangular parallelepiped. Are pivotally connected to the outer edge of the bottom base including the bottom wall, and the pair of first side walls are folded on the bottom wall, and then the pair of second side walls are on the first side wall. Folded into a folded state, a pair of second side walls were raised, then a pair of first side walls were raised to an assembled state, and provided on each side edge of the first side wall and the second side wall. A box body in which the first side wall is locked in an upright state by engagement between the side wall locking portions, and is used as an exhibition stand with a lid attached or upside down, or as a storage box In the box used, it is arranged side by side for each side edge of each first side wall, and extends over the entire top and bottom of each first side wall. A pair of vertically long pairs that extend parallel to each other and are in a state of being stretched against the load that the box receives from above between the lid and other side wall tip abutment that abuts against the tip of the first side wall and the bottom base The side wall engaging groove formed by closing the inner surface side of the first side wall in the whole or a part of the pair of vertically long flat plate walls with the groove bottom wall, and both side portions of the second side wall on the first side wall side It has a feature in that it includes a side protruding wall bent at a right angle to the inner surface and an engaging protrusion protruding from the inner surface front edge of the side protruding wall and engaging with the side engaging groove.

  According to a second aspect of the present invention, in the box according to the first aspect, the first lateral rib extends across the entire lateral direction of the inner side surface of the first side wall, and both ends communicate with each other between a pair of longitudinal flat plate walls. It has the feature in having provided.

  The invention according to claim 3 is the box according to claim 1 or 2, wherein the engaging protrusion is divided into a plurality of parts by a protrusion dividing groove extending in the vertical direction and provided in the middle in the vertical direction. Between the vertically long flat plate walls, there is a feature that a first lateral rib that is received in the projecting part dividing groove is provided.

  According to a fourth aspect of the present invention, in the box according to any one of the first to third aspects, the upper end position of the inner side surface of the second side wall extends laterally, and both end portions thereof are side projecting walls. A second lateral rib connected is provided, and the positions of both ends of the second lateral rib in the longitudinal direction are protruded toward the first side walls to serve as side wall locking portions of the second side walls. The vertically flat plate wall on the second side wall is used as a side wall locking portion for the first side wall, the side wall locking portion for the second side wall is orthogonal to the inner side surface of the second side wall, and the side wall locking portion for the first side wall It is characterized in that an engaging surface to be engaged and a guide slope that is disposed on the opposite side of the engaging surface and is inclined with respect to the inner surface of the second side wall are provided.

[Invention of Claim 1]
When the box body of claim 1 receives a load from above in the assembled state, the vertically long flat plate wall provided at the side edge of each first side wall is between the lid body and other side wall tip abutting objects and the bottom base. It becomes a tension state. Since such a vertically long flat plate wall is arranged in a pair for each side edge portion of each first side wall in the box body of the present invention, the buckling strength of each first side wall has a side wall locking. The emphasis is on the side edges with the part. Further, the buckling strength of the second side wall is increased by a side protruding wall formed by bending both sides thereof at a right angle. The engaging protrusion protruding from the side protruding wall is concavo-convexly engaged with the side engaging groove including the pair of vertically long flat plate walls and the groove bottom wall on the first side wall, thereby reinforcing the side protruding wall. As a result, the buckling strength of the second side wall is also intensively increased at the side edges provided with the side wall locking portions. As a result, the engagement between the side wall locking portions is unlikely to be inadvertently disengaged, and an increase in the weight of the box itself accompanying an increase in strength can be suppressed, and the allowable load weight can be increased as compared with the prior art.

[Invention of claim 2]
In the box of claim 2, the horizontal deformation of the first side wall is suppressed by the first horizontal rib extending over the entire lateral direction of the inner side surface of the first side wall, and both end portions of the first side rib are Since the pair of vertically long flat walls communicates with each other, the pair of vertically long flat walls reinforce each other and the buckling strength increases.

[Invention of claim 3]
According to the third aspect of the present invention, since the first lateral rib communicates between the pair of vertically long flat plate walls, the pair of vertically long flat plate walls reinforce each other to increase the buckling strength. Here, the first horizontal rib may be unevenly distributed on the back side between the pair of vertically long flat plate walls, and the engaging protrusion may be unevenly fitted on the front side of the first horizontal rib. In the box body, since the projecting part dividing groove for receiving the first lateral rib is provided in the engaging projecting part, the first lateral rib is arranged in the entire depth direction between the pair of vertically long flat plate walls. The reinforcement of the pair of vertically long flat walls by the lateral ribs can be enhanced.

[Invention of claim 4]
In the box according to the fourth aspect, the horizontal deformation of the second side wall is suppressed and the side protruding wall is reinforced by the second lateral rib. In addition, the side wall locking portions of the second side walls are formed by projecting the positions of both ends of the second lateral rib in the longitudinal direction toward the first side walls, and the side wall locking portions of the second side walls are formed on the first side walls. The first side wall can be locked in an upright state by engaging with a vertically long flat plate wall as the side wall locking portion. In the process of raising the first side wall, the side wall engaging portion of the first side wall and the second side wall are engaged with each other by bringing the side wall engaging portion of the first side wall into sliding contact with the guide slope provided on the side wall engaging portion of the second side wall. The stop portions can be easily engaged with each other.

The perspective view of the display stand which consists of a box and lid concerning one embodiment of the present invention Perspective view of the top side of the lid Perspective view of the bottom side of the lid Top side perspective view of bottom base Bottom side perspective view of bottom base Partially enlarged perspective view of the bottom surface side of the bottom base The inner surface side perspective view of the 1st support protrusion of a bottom base The outer surface side perspective view of the 1st support protrusion of a bottom base The inner surface side perspective view of the 2nd support protrusion of a bottom base The outer surface side perspective view of the 2nd support protrusion of a bottom base The perspective view of the inner surface side of the first side wall Perspective view of outer surface side of first side wall Partially enlarged perspective view of the outer surface side of the first side wall Partially enlarged perspective view of the inner surface side of the first side wall The perspective view of the state which assembled | attached the bottom part base, the 1st side wall, and the 2nd side wall. The perspective view of the rotation support part of a 1st side wall and a 2nd side wall Perspective view of the inner surface side of the second side wall Perspective view of the outer surface side of the second side wall Partially enlarged perspective view of the inner surface side of the second side wall The perspective view of the engaging part of a 1st side wall and a 2nd side wall Upper perspective view of first and second side walls engaged with each other Partially broken perspective view of first and second side walls engaged with each other Perspective view of box with one first side wall in the middle of rotation Partially broken perspective view of a box with one first side wall folded A perspective view of a box with both first side walls folded and both second side walls standing. Partially cutaway perspective view of box with both first side walls folded Side sectional view of the box with both first side walls folded A perspective view of a folded box The perspective view of the state which attached the lid to the box in the assembled state Lower perspective view of a state in which a lid is fitted to the upper ends of the first and second side walls A perspective view of a state in which a lid is attached to a folded box The perspective view of the state which connected two boxes with one lid The perspective view of the state which connected two boxes with two lids Perspective view of a group of exhibition stands connected in a predetermined manner

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the box 10 according to the present embodiment has a rectangular parallelepiped shape whose upper surface is open, and is used as an exhibition stand 90 with the upper surface opening closed by a flat rectangular parallelepiped lid 70 whose lower surface is open. Is done.

  As shown in FIG. 2, the lid body 70 includes a plurality of rectangular protrusions 28 arranged in a matrix on a horizontal and rectangular main plate 71, and the lid side wall 75 is suspended from the outer edge of the main plate 71. It is prepared. The square protrusion 28 is formed by partially bulging the main plate 71 upward, and has a square planar shape and a horizontal upper surface. Further, the outer side surfaces of the square projections 28 arranged on the outer edge side of the main flat plate 71 are shifted uniformly inward from the outer side surface of the lid side wall 75, whereby the square projections 28 group on the upper surface of the main flat plate 71. A frame-like outer edge surface 26 is formed on the outer portion. Further, the planar shape of the lid 70 is a rectangle having a vertical / horizontal ratio of 2: 1, and the upper surface of the lid between the columns of the square protrusions 28 group and between the rows of the square protrusions 28 group. The groove 27 is arranged in seven partition positions that divide the longitudinal direction of the planar shape of the lid 70 into eight equal parts and three partition positions that divide the short direction into four equal parts.

  As shown in FIG. 3, a lid lower surface rib 80 is provided on the lower surface of the main flat plate 71. The lid lower surface rib 80 protrudes from the back of the lid upper surface groove 27 of the main flat plate 71 and has a lattice shape as a whole, and the lower surface of the lid lower surface rib 80 is flush with the lid side wall 75. Further, the rotation restricting protrusions 29 are formed to project at the four corners of the lower surfaces of the two half-covers 70H, 70H obtained by dividing the lid 70 in the center in the longitudinal direction. Each rotation restricting protrusion 29 has a rectangular tube shape and is disposed at the center of the rectangular protrusion 28. As shown in FIG. 2, a projecting wall back groove 29 </ b> M is formed on the upper surface of the upper surface wall 28 </ b> A of the square projecting portion 28 by recessing the position directly behind the rotation restricting projecting portion 29 into a groove shape. .

  As shown in FIG. 1, the planar shape of the box 10 is the same rectangle as the planar shape of the lid 70, and the aspect ratio is 2: 1. The box 10 includes a pair of first side walls 30 and 30 disposed on the long side portion of the rectangular shape of the plane, a pair of second side walls 50 and 50 disposed on the short side portion, and The bottom side base 11 is configured to rotatably support the lower end portions of the first side walls 30 and 30 and the second side walls 50 and 50.

  The bottom base 11, the first and second side walls 30, 50, and the lid 70 described above are all molded products of resin.

  As shown in FIG. 4, the bottom base 11 includes a rectangular bottom wall 12 positioned at the bottom of the box body 10, and a pair of first support protrusions 13 from the long side portion of the outer edge of the bottom wall 12, 13 protrudes upward, and a pair of second support protrusions 14 and 14 protrude upward from the short side portion of the outer edge of the bottom wall 12.

  As shown in FIG. 5, the first and second support protrusions 13 and 14 both have a groove-shaped structure with an open bottom surface. Specifically, the first support protrusion 13 includes a first inner wall 13A formed by bending the outer edge of the bottom wall 12 at a right angle upward, and a first outer wall 13B opposed to the first inner wall 13A from the outside. And the first upper connecting wall 13C that communicates between the upper ends thereof, and the second support protrusion 14 similarly includes the second inner side wall 14A, the second outer side wall 14B, and the second upper connecting wall 14C. Consists of. The first and second inner walls 13A, 13A, 14A, and 14A constitute a base inner frame wall 16 having a frame structure, and the first and second outer walls 13B, 13B, 14B, and 14B are framed. A base outer frame wall 15 having a shape structure is formed.

  As shown in FIG. 27, the lower surface 15C of the base outer frame wall 15 is positioned below the lower surface of the bottom wall 12, and a portion of the base outer frame wall 15 that protrudes below the bottom wall 12 is a lower surface fitting protrusion. It is a wall 15K. Further, as shown in FIG. 5, the bottom surface of the bottom wall 12 has a position that bisects the overall length in the short direction in the planar shape of the bottom base 11 (also the planar shape of the box 10), and the longitudinal direction A bottom plate lower surface rib 12L is formed so as to protrude into a position that divides the entire length into four parts, and between the base inner frame wall 16 and the base outer frame wall 15 on an extension line of each bottom plate lower surface rib 12L. A partitioning rib 15M for communication is provided. The lower surfaces of the partition rib 15M and the bottom plate lower surface rib 12L are flush with the lower surface 15C of the base outer frame wall 15.

  As shown in FIG. 5, 1 is communicated between the base outer frame wall 15 and the base inner frame wall 16 at the approximate center of each portion partitioned by the partition rib 15M in the outer edge portion of the lower surface of the bottom base 11. Paired communication ribs 15L are provided. The base outer frame wall 15 and the base inner frame wall 16 are also connected by an extension rib 15N formed by extending the second inner side wall 14A of the second support protrusion 14. The lower surfaces of the communication ribs 15L and the extension ribs 15N are flush with the lower surface of the bottom wall 12 and are located above the lower surface 15C of the base outer frame wall 15 as shown in FIG. As shown in FIG. 4, the upper surface of the bottom wall 12 is divided into a position where the overall length in the short direction in the planar shape of the bottom base 11 is divided into 4 equal parts and a position where the entire length in the longitudinal direction is equally divided into 8 parts. Each of the bottom plate upper surface ribs 12M is formed so as to protrude, and the entire bottom plate upper surface ribs 12M have a lattice shape.

  The first support protrusion 13 extends so as to communicate between the second inner side walls 14A and 14A of both the second support protrusions 14 and 14, and the first support protrusion 13 has a longitudinal center portion thereof, A central support protrusion 17 is formed by projecting a part of the first support protrusion 13 upward to the same height as the second support protrusion 14. In addition, the entire portion of the first support protrusion 13 excluding the center support protrusion 17 has a uniform height lower than that of the second support protrusion 14, and a corner where the upper surface 13J and the inner surface 13E intersect each other. A chamfered slope 13D is formed as a whole. Further, the first side wall 30 is rotatably supported at both sides of the first support protrusion 13 adjacent to the center support protrusion 17 and at positions near both ends of the second support protrusions 14 and 14. A hinge recess 19 is provided.

  As shown in FIG. 7, the hinge recess 19 opens from a position near the outer surface 13F on the upper surface 13J of the first support protrusion 13 to an intermediate position in the vertical direction of the inner surface 13E. Moreover, a part of opening of the hinge recessed part 19 is extended in the step shape on both sides by the upper surface 13J, and becomes the pin introduction holes 19H and 19H.

  A first outer wall 13B of the first support protrusion 13 is disposed on the innermost surface of the hinge recess 19 farthest from the inner surface 13E of the first support protrusion 13, and the lowermost portion of the hinge recess 19 is The first inner wall 13 </ b> A is closed by a recess bottom wall 19 </ b> A that communicates between the lower end opening edge of the hinge recess 19 and the back surface on the first outer wall 13 </ b> B side. Further, both inner side surfaces of the hinge recess 19 are recessed sidewalls 19B (see FIG. 7) that connect between both side edges of the opening of the hinge recess 19 and the inner surface of the first outer wall 13B and the upper surface of the recess bottom wall 19A. Is closed at one side wall 19B only). In each recess side wall 19B, pin engaging grooves 19J are formed by recessing the lower positions of the pin introduction holes 19H into groove shapes. In addition, a pair of locking projections 19C and 19C projecting so as to approach each other from a pair of opposed surfaces in the pin engagement groove 19J are provided at the upper end portion of the pin engagement groove 19J. Both the locking projections 19C and 19C are provided with substantially horizontal locking surfaces 19D and 19D at the lower end portion, and introduction slopes 19E and 19E inclined at an upper end portion so as to be separated from each other upward. ing.

  As shown in FIG. 4, the central support protrusion 17 extends in the longitudinal direction of the first support protrusion 13 with a length of about 1.5 times the square partitioned by the above-described bottom plate upper surface rib 12M in a lattice shape. Yes. Further, as shown in FIG. 7, both side end surfaces 17T and 17T of the central support protrusion 17 facing the longitudinal direction of the first support protrusion 13 stand upright from the upper surface 13J of the first support protrusion 13. Yes. Furthermore, the inner side surface 17E of the central support protrusion 17 is flush with the inner side surface 13E of the first support protrusion 13 only at the upper edge. Further, the inner side surface 17E of the central support protrusion 17 is bulged so that the entire portion excluding the upper edge portion is shifted inward from the inner side surface 13E of the first support protrusion 13, and an inner side bulge portion 18 is formed. Is formed. Further, a chamfered slope 18D is formed at the upper end of the inner side bulging portion 18 so as to be gradually inclined outward toward the upper side. Further, a chamfered slope 17D is formed on the entire upper corner of the central support protrusion 17 at the entire corner where the upper surface 17J and the inner surface 17E intersect.

  As shown in FIG. 8, the outer surface 17 </ b> F of the central support protrusion 17 is flush with the outer surface 13 </ b> F of the entire first support protrusion 13. Further, a horizontal step surface 20 is formed at a position near the upper end of the outer side surface 17F of the central support protrusion 17. The upper portion of the central support protrusion 17 above the horizontal step surface 20 is a support upper surface protrusion 22 that can be received inside the lid body 70. Further, a rib receiving groove 23 is formed at the center in the longitudinal direction of the central support protrusion 17 so as to divide the support upper surface protrusion 22 into two.

  As shown in FIG. 9, the second support protrusion 14 extends over the entire short direction of the planar shape of the bottom base 11, and the side end surfaces 14T and 14T of the second support protrusion 14 are both first support. The protrusions 13 and 13 are flush with the outer surfaces 13F and 13F. A chamfered slope 14D is formed at the upper end of the second support protrusion 14 over the entire corner where the upper surface 14J and the inner surface 14E intersect. Further, a pair of hinge recesses 19, 19 having the same structure as the hinge recess 19 of the first support protrusion 13 are provided at positions near both ends in the longitudinal direction of the second support protrusion 14. The hinge recesses 19 and 19 of the second support protrusions 14 are disposed at a position higher than the hinge recess 19 of the first support protrusion 13.

  As shown in FIG. 10, the same horizontal step surface 20 as the horizontal step surface 20 of the central support protrusion 17 is formed at a position near the upper end of the outer surface 14F and the side end surfaces 14T, 14T of the second support protrusion 14, An upper portion of the second support protrusion 14 above the horizontal stepped surface 20 is also the above-described support upper surface protrusion 22. The horizontal step surface 20 of the central support protrusion 17 and the horizontal step surface 20 of the second support protrusion 14 are flush with each other, and outside the both side portions of the support upper surface protrusion 22 of the second support protrusion 14. The side surface 21 and the outer surface 21 (see FIG. 8) of the support upper surface protrusion 22 of the central support protrusion 17 are flush with each other.

  As shown in FIG. 9, the second support protrusion 14 is formed with three rib receiving grooves 23 that are the same as the rib receiving grooves 23 of the center support protrusion 17 described above so that the support upper surface protrusion 22 is divided into four parts. Has been. The rib receiving grooves 23 are arranged at three partition positions that divide the entire length of the second support protrusion 14 into four equal parts. The rib receiving grooves 23, 23 at both ends of the three rib receiving grooves 23 are located in the center in the width direction of both hinge recesses 19, 19 in the second support protrusion 14.

  Next, the first side wall 30 will be described. As shown in FIG. 11, the first side wall 30 has a horizontally long rectangular main plate wall 31, and has a structure including a central rectangular recess 30 </ b> A by cutting the center of the lower end of the main plate wall 31 into a rectangle. ing. Further, the lower edge reinforcing rib 36 protrudes inward from the lower edge portion of the main plate wall 31, and the upper edge reinforcing rib 37 protrudes inward from the upper edge portion of the main plate wall 31. The 1 side edge reinforcement ribs 32 and 32 protrude inward. Note that the protruding amounts of the lower edge reinforcing rib 36, the upper edge reinforcing rib 37, and the first side edge reinforcing rib 32 from the main plate wall 31 are the same.

  A plurality of hinge protrusions 39 corresponding to the plurality of hinge recesses 19 in the first support protrusion 13 of the bottom base 11 are provided on the lower surface of the lower edge reinforcing rib 36. As shown in FIG. 14, the hinge protrusion 39 has a structure in which the rotation pins 39S and 39S protrude in opposite directions from both side surfaces of the pin support protrusion 39C protruding from the lower surface of the lower edge reinforcing rib 36. Yes. Then, the rotation pins 39S and 39S are pushed into the pin introduction holes 19H and 19H of the hinge recess 19 shown in FIG. 19J, 19J is retained within. More specifically, as shown in FIG. 14, the pin support protrusion 39 </ b> C projects a pair of pin support protrusions 39 </ b> B and 39 </ b> B that protrude from the lower surface of the lower edge reinforcing rib 36 and face each other in the lateral direction of the first side wall 30. A connecting wall 39A is provided between the outer edges located on the first outer wall 13B side and the recess bottom wall 19A side in the hinge recess 19 in the standing state of the first side wall 30 of the pin support projecting pieces 39B, 39B. It has a contact structure. Further, the rotation pins 39S and 39S are formed in a columnar shape and are arranged at positions closer to the lower ends on the outer surfaces of the respective pin support protrusions 39B and 39B, and are arranged coaxially. Then, as the rotating pins 39S and 39S are engaged with the pin engaging grooves 19J and 19J as described above, the first side wall 30 rotates with respect to the bottom base 11 around the rotating pins 39S and 39S. It can change to the standing state which stood on the 1st support protrusion 13 as shown in FIG. 16, and the folding state piled up on the bottom wall 12 as shown in FIG. Moreover, when the 1st side wall 30 will be in an upright state, as shown in FIG. 15, it will be in the state by which the center support protrusion 17 was fitted by 30 A of center rectangular recessed parts.

  In the box 10 of the present embodiment, chamfered slopes 13D and 17D are formed at the inner edge corners of the upper end portions of the first support protrusion 13 and the center support protrusion 17 in the bottom base 11, so that the rotation pin The first side wall 30 can be smoothly rotated while the 39S is positioned at a substantially constant position in the pin engaging groove 19J.

  As shown in FIG. 11, both end portions of the lower edge reinforcing rib 36 and the upper edge reinforcing rib 37 intersect with the first side edge reinforcing ribs 32, 32, and further on both sides of the first side edge reinforcing ribs 32, 32. It extends to the direction. Further, on both sides of the first side edge reinforcing ribs 32, 32, there are second side edge reinforcing ribs 33, 33 that communicate between the lower edge reinforcing rib 36 and the top edge of the upper edge reinforcing rib 37. In this embodiment, the first and second side edge reinforcing ribs 32 and 33 are the “longitudinal flat plate wall” of the present invention.

  On the inner surface of the main plate wall 31, a plurality of lateral ribs 35 (corresponding to the “first lateral ribs” of the present invention) extending in the lateral direction at a plurality of locations between the lower edge reinforcing ribs 36 and the upper edge reinforcing ribs 37. Is provided. Further, except for the following central lateral rib 35B which is a part of the lateral rib 35, the protruding amount of the lateral rib 35 from the main plate wall 31 is smaller than the protruding amount of the lower edge reinforcing rib 36 and the like from the main plate wall 31. . Further, like the lower edge reinforcing rib 36 and the upper edge reinforcing rib 37, the lateral rib 35 intersects with the first side edge reinforcing ribs 32, 32 and further extends to both sides, and the tips thereof are as shown in FIG. Are connected to the second side edge reinforcing ribs 33, 33.

  As shown in FIG. 11, among the plurality of horizontal ribs 35, the lowermost horizontal rib 35 (hereinafter referred to as “lowermost horizontal rib 35” as appropriate) is on the extension line of the upper edge of the central rectangular recess 30A. The middle portion in the longitudinal direction is a central lateral rib 35B whose projection from the main plate wall 31 is the same size as the lower edge reinforcing rib 36 and the like. The central lateral rib 35B extends longer on both sides than the lateral width of the central rectangular recess 30A, and at the intermediate portion of the central lateral rib 35B, a part of the central lateral rib 35B is cut off to a position closer to the main plate wall 31. 35C is formed. Further, the central lateral rib 35B of the portion where the manual feed portion 35C is formed has a smaller amount of protrusion from the main plate wall 31 than the other portions.

  As shown in FIG. 14, the first and second side edge reinforcing ribs 32 and 33 intersect with the upper edge reinforcing rib 37 and extend further upward. And the upper end part of the 1st and 2nd side edge reinforcement ribs 32 and 33 is connected by the block upper surface wall 41A of the below-mentioned corner fitting block 41 with which the both ends of the upper surface of the upper edge reinforcement rib 37 were equipped. ing. Further, in the region sandwiched between the first and second side edge reinforcing ribs 32 and 33 from the left and right direction, the portion sandwiched from the upper and lower direction by the upper edge reinforcing rib 37 and the lowermost lateral rib 35 includes the first A groove bottom wall 34 is provided between the first side wall 30 and the second side edge reinforcing ribs 32, 33. The groove bottom wall 34 is closed from the inner side surface side of the first side wall 30, and the groove bottom wall 34 and the first and second side edge reinforcing ribs are provided. The side engaging grooves 34 </ b> M according to the present invention are configured by 32 and 33.

  As shown in FIG. 13, on the outer surface side of the first side wall 30, the upper side portion of the outward leading end surface 33 </ b> C of the second side edge reinforcing rib 33 above the lowermost lateral rib 35 is first from the outer surface of the main plate wall 31. It is arranged slightly shifted on the inner surface side of the side wall 30. In addition, the upper portion of the outward leading end surface 33C of the second side edge reinforcing rib 33 from the position near the upper end is further shifted slightly toward the inner side surface of the first side wall 30, and the upper edge reinforcing rib is adjusted accordingly. 37, the outer edge of the portion sandwiched between the first and second side edge reinforcing ribs 32 and 33 is also shifted to a position that is flush with the outward leading end surface 33C of the upper end of the second side edge reinforcing rib 33. Has been. A portion surrounded by the first and second side edge reinforcing ribs 32, 33, the upper edge reinforcing rib 37, and the block upper surface wall 41A at the upper end portion of the first side wall 30 is defined by the block sub front wall 41D. The side wall 30 is closed from the outer surface side.

  Further, on the lower side of the lowermost lateral rib 35 in the first side wall 30, a main plate protruding wall 31D is formed by extending a part of the main plate wall 31 further to the side than the first side edge reinforcing rib 32, The main plate protruding wall 31 </ b> D closes the space between the first and second side edge reinforcing ribs 32 and 33 from the outer surface side of the first side wall 30. Further, the lowermost horizontal rib 35 in the group of horizontal ribs 35 has a portion sandwiched between the second side edge reinforcing rib 33 and the first side edge reinforcing rib 32 as compared to the same portion of the other side rib 35. It protrudes outward and is connected to the upper edge of the main plate protruding wall 31D.

  As shown in FIG. 11, the inner surface of the main plate wall 31 extends in the vertical direction at a plurality of locations between the pair of first side edge reinforcing ribs 32, 32, and has a lower edge reinforcing rib 36 and an upper edge reinforcing rib 37. A plurality of vertical ribs 38 communicating with each other are provided. These vertical ribs 38 are arranged at two partition positions adjacent to the center and two partition positions at both ends among seven partition positions that divide the longitudinal direction of the planar shape of the box 10 into eight equal parts. . As a result, as shown in FIG. 15, these vertical ribs 38 are bottom plate upper surface ribs 12M1, 12M1 adjacent to the center bottom plate upper surface rib 12M among the seven bottom plate upper surface ribs 12M aligned in the longitudinal direction of the bottom base 11, and The arrangement corresponds to the bottom plate upper surface ribs 12M2 and 12M2 at both ends (only one bottom plate upper surface rib 12M2 is shown in FIG. 15).

  In addition, regarding the two vertical ribs 38 and 38 closer to the center in the group of the vertical ribs 38, the lower portion of the lowermost horizontal rib 35 protrudes greatly from the first side wall 30 as compared with the upper portion, and the proximal end reinforcing ribs. 38B and 38B. Further, the protruding amount of the base end reinforcing ribs 38 </ b> B and 38 </ b> B from the first side wall 30 is the same as the protruding amount of the lower edge reinforcing rib 36. On the other hand, the protruding amount of the entire vertical rib 38 group other than the base end reinforcing rib 38B from the first side wall 30 is the same as the protruding amount of the lateral rib 35. In addition, a range between the two vertical ribs 38, 38 near the center of the lowermost horizontal rib 35 is the above-described central horizontal rib 35B. Further, a pair of proximal reinforcing ribs 38C and 38C having the same size as the proximal reinforcing ribs 38B and 38B protrudes inward from both inner edges in the central rectangular recess 30A, and their upper end portions are located in the center lateral direction. It is connected to the rib 35B.

  As shown in FIG. 12, a rib back groove is formed on the outer surface of the main plate wall 31 in the first side wall 30 by recessing the positions directly behind the lateral ribs 35, the longitudinal ribs 38, and the base end reinforcing ribs 38C (see FIG. 11). 30M is formed. By forming the rib back groove 30M, distortion due to sink marks due to the lateral rib 35 and the like at the time of resin molding of the first side wall 30 becomes inconspicuous.

  As shown in FIG. 11, a pair of corner fitting blocks 41, 41 are provided at both ends in the longitudinal direction on the upper surface of the upper edge reinforcing rib 37, and between the corner fitting blocks 41, 41. A plurality of (for example, six) fitting blocks 40 are provided. Each of the corner fitting block 41 and the fitting block 40 has a horizontally long box shape structure in which the inner side surface of the first side wall 30 is opened.

  Specifically, the fitting block 40 stands between the upper edge portions of the pair of quadrangular block side walls 40B and 40B that stand up from the upper edge reinforcing rib 37 and face each other in the lateral direction of the first side wall 30. The block is closed by the upper surface wall 40A, and the block side walls 40B and 40B are closed by the block front wall 40C (see FIG. 12) between the edges on the outer surface side of the first side wall 30.

  Further, as shown in FIG. 14, the corner fitting block 41 has one end in the lateral direction constituted by the upper end portion of the second side edge reinforcing rib 33, and the other end in the lateral direction is a block of the fitting block 40. The block side wall 41B has the same shape as the side wall 40B. Further, the upper surface of the corner fitting block 41 is configured by a block upper surface wall 41A disposed on an extension line of the block upper surface wall 40A in the fitting block 40, and the block upper surface wall 41A is an end portion of the upper edge reinforcing rib 37. Similar to the shape, the second side edge reinforcing rib 33 side is narrower. The block upper surface wall 41 </ b> A blocks the block side wall 41 </ b> B and the upper edge portion of the second side edge reinforcing rib 33. Moreover, the upper end part of the 1st side edge reinforcement rib 32 is connected to the boundary position which becomes narrow in the longitudinal direction of the block upper surface wall 41A. Further, on the outer surface side of the first side wall 30, the space between the first side edge reinforcing rib 32 and the second side edge reinforcing rib 33 is closed by the block sub front wall 41D as described above, and on the opposite side. The first side edge reinforcing rib 32 and the block side wall 41B are closed by a block front wall 41C disposed on the extension line of the block front wall 40C in the fitting block 40.

  Dividing grooves 24 are formed between the adjacent fitting blocks 40, 40 and between the fitting block 40 and the corner fitting block 41, respectively. The plurality of dividing grooves 24 are arranged at seven partition positions that divide the planar shape of the box 10 into eight equal parts in the vertical direction. As a result, as shown in FIG. The arrangement corresponds to seven bottom plate upper surface ribs 12M arranged in the longitudinal direction.

  As shown in FIG. 13, the block front walls 40 </ b> C and 41 </ b> C of the fitting block 40 and the corner fitting block 41 are displaced from the inner side with respect to the outer surface of the main plate wall 31. A step horizontal surface 25 is formed outside the fitting block 40 and the corner fitting block 41. The step horizontal surface 25 has substantially the same depth as the horizontal step surface 20 in the bottom base 11 described above. Further, the level difference plane 25 and the bottom surface of the dividing groove 24 are flush with each other.

  Next, the second side wall 50 will be described. As shown in FIG. 17, the second side wall 50 has a main plate wall 51 having an oblong rectangular shape as a whole, and a pair of side protruding walls formed by bending both side portions of the main plate wall 51 at right angles to the bottom base 11 side. 54, 54 is provided. Further, a lower edge reinforcing rib 52 protrudes inward from the lower edge portion of the main plate wall 51, and an upper edge reinforcing rib 53 (corresponding to the “second lateral rib” of the present invention) from the upper edge portion of the main plate wall 51. Projects inward. The protruding amount of the lower edge reinforcing rib 52 and the upper edge reinforcing rib 53 from the main plate wall 51 is the same, and is smaller than the protruding amount of the side protruding wall 54 from the main plate wall 51.

  On the lower surface of the lower edge reinforcing rib 52, a pair of hinge protrusions 39 having the same structure as the hinge protrusion 39 of the first side wall 30 described above is formed as a pair of hinge recesses in the second support protrusion 14 of the bottom base 11. 19 is provided at a position corresponding to 19. Then, the rotation pins 39S and 39S of each hinge protrusion 39 are engaged with the pin engagement grooves 19J and 19J in the respective hinge recesses 19 of the second support protrusion 14 so that the rotation pins 39S and 39S are the center. The second side wall 50 rotates relative to the bottom base 11 and rises on the second support protrusion 14 as shown in FIG. 16, and on the first side walls 30 and 30 as shown in FIG. It can be changed to the folded state overlaid on.

  In the box 10 of the present embodiment, the chamfered slope 14D is formed at the inner edge corner of the upper end portion of the second support protrusion 14 in the bottom base 11, so that the rotation pin 39S is placed in the pin engagement groove 19J. The second side wall 50 can be smoothly rotated while being in a substantially constant position.

  On the upper surface of the upper edge reinforcing rib 53, a plurality of (for example, four) fitting blocks 56 are provided side by side in the longitudinal direction. Each fitting block 56 has the same structure and the same size as each fitting block 40 of the first side wall 30. That is, each fitting block 56 closes the upper surface side and the outer surface side between the pair of block side walls 56B, 56B raised from the upper edge reinforcing rib 53 by the block upper surface wall 56A and the block front wall 56C. It has a horizontally long box-shaped structure in which the inner side surface of the second side wall 50 is open. Further, between the adjacent fitting blocks 56, 56, the same dividing groove 24 as the dividing groove 24 between the adjacent fitting blocks 40, 40 of the first side wall 30 is formed, respectively. The dividing grooves 24 are arranged at three partition positions that divide the short-side direction of the planar shape of the box 10 into four equal parts.

  As shown in FIG. 18, the block front wall 56 </ b> C of the fitting block 56 is displaced from the inside of the outer surface of the main plate wall 51, and the first upper surface of the upper edge reinforcing rib 53 has a first outside the fitting block 56. A step horizontal plane 25 identical to the step horizontal plane 25 of the side wall 30 is formed. Further, a corner projecting piece 57 extending from one block side wall 56B of each fitting block 56 disposed on the side projecting wall 54 side is provided above the side projecting wall 54. The outer surfaces of the corner projecting pieces 57 and the block side wall 56B are flush with each other and are shifted from the inner side with respect to the outer surfaces of the side projecting walls 54. As a result, a step horizontal surface 25 is also formed on the side protruding wall 54, and the step horizontal surface 25 on the side protruding wall 54 and the step horizontal surface 25 on the upper edge reinforcing rib 53 are connected in a flush manner. .

  As shown in FIG. 17, a plurality of (for example, three) engaging protrusions 62 are provided on the inner surface of the side protrusion wall 54 along the tip edge thereof, and the adjacent engaging protrusions 62, Between 62, it is the protrusion division | segmentation groove | channel 62M. Each engaging protrusion 62 has a vertically long box-like structure, and one surface thereof is open in the same direction as the fitting block 56 described above. Specifically, the engagement protrusion 62 stands up from the inner surface of the side protrusion wall 54 and closes the tip of the pair of protrusion side walls 62B, 62B facing each other in the vertical direction with the protrusion tip wall 62A. At the same time, the main plate wall 51 side between the projecting side walls 62B and 62B is closed by the projecting front wall 62C. In addition, among the plurality of engaging protrusions 62, the lowermost engaging protrusion 62 is shorter in the vertical direction than the other engaging protrusions 62. Further, the corners where the protrusion side wall 62B and the protrusion tip wall 62A intersect among the engagement protrusions 62 are all provided with inclined surfaces except for the lower end part of the lowest engagement protrusion 62. It is chamfered. Further, as shown in FIG. 19, the corners where the protrusion tip wall 62A and the protrusion front wall 62C intersect are all chamfered so as to have an inclined surface. Note that the engaging protrusions 62 group is disposed away from the tip of the lower edge reinforcing rib 52 toward the tip of the side protrusion wall 54.

  As shown in FIG. 17, a pair of vertical ribs 58, 58 and a pair of horizontal ribs 55, 55 project from the inner surface of the main plate wall 51. The pair of vertical ribs 58 and 58 are disposed at two partition positions other than the center among the three partition positions that divide the short direction in the planar shape of the box 10 into four equal parts. As a result, as shown in FIG. 15, among the three bottom plate upper surface ribs 12M arranged in the short direction of the bottom base 11, the arrangement corresponds to the bottom plate upper surface ribs 12M3 on both sides of the central bottom plate upper surface rib 12M. These vertical ribs 58 extend in the vertical direction and communicate between the lower edge reinforcing rib 52 and the upper edge reinforcing rib 53. Further, the protruding amount of the vertical rib 58 from the main plate wall 51 is smaller than the protruding amounts of the lower edge reinforcing rib 52 and the upper edge reinforcing rib 53.

  Further, the pair of lateral ribs 55, 55 are disposed at the same height as the projecting part dividing grooves 62M, 62M in the vertical direction of the second side wall 50 and extend in the horizontal direction. 54 and 54 are in communication. And the side protrusions 60 and 60 which protruded to the engagement protrusion 62 side are provided in the both ends of the horizontal rib 55 (In FIG. 17, only the side protrusion 60 of the one end side of the horizontal rib 55 is shown. It is shown).

  As shown in FIG. 19, the side protrusion 60 rises from the protruding end wall 62 </ b> A of the engaging protrusion 62 from the laterally central position of the second side wall 50, and goes toward the side protruding wall 54. An inclined guide surface 60A that gradually protrudes toward the engaging protrusion 62 side, and a protruding flat surface 60B that extends in parallel with the main plate wall 51 from the position near the side protrusion wall 54 to the side protrusion wall 54 in the side protrusion 60. Is provided. Further, the protruding flat surface 60B of the side protrusion 60 is disposed at the same position as the tip of the lower edge reinforcing rib 52 in the inner and outer directions of the second side wall 50, and the main plate wall 51 from the protrusion front wall 62C of the engaging protrusion 62. Located apart on the side. As shown in FIG. 17, the protruding amount from the main plate wall 51 of the portion other than the side protruding portion 60 in the horizontal rib 55 is the same as the protruding amount of the vertical rib 58.

  A pair of side wall locking portions 59, 59 are provided at positions closer to both ends of the tip portion of the upper edge reinforcing rib 53. As shown in FIG. 19, each side wall locking portion 59 has a part of the upper edge reinforcing rib 53 protruding so that the entire side wall locking portion 59 is separated from the main plate wall 51 by the protruding flat surface 60 </ b> B of the side protrusion 60. Located on the far side. Further, the side wall locking portion 59 has a guide inclined surface 59A that is inclined in the same manner as the inclined guide surface 60A near the lateral center of the second side wall 50, and is orthogonal to the tip surface of the upper edge reinforcing rib 53 on the opposite side. Further, a front end surface 59C parallel to the main plate wall 51 is formed between the guide slope 59A and the engagement surface 59B. The engagement surface 59B is positioned slightly closer to the lateral center of the second side wall 50 than the protrusion tip wall 62A of the engagement protrusion 62. In the present embodiment, the upper end portion of the second side edge reinforcing rib 33 on the first side wall 30 is a side wall locking portion 33K (see FIG. 21) as an engagement partner with the side wall locking portion 59.

  As shown in FIG. 18, on the outer surface of the main plate wall 51 in the second side wall 50, like the first side wall 30, the positions directly behind the horizontal ribs 55 and the vertical ribs 58 are recessed in a groove shape to form rib back grooves. 50M is formed. At the center of the upper end portion of the outer surface of the second side wall 50, a bag-like manual feed portion 50 </ b> H is formed in which a part of the main plate wall 51 is bulged inward and opened on the outer surface of the main plate wall 51.

  The description regarding the structure of the box 10 of this embodiment is above. Next, the effect of the box 10 will be described. The box 10 can be folded or assembled as follows. As shown in FIG. 1, in order to fold the box 10 in an assembled state, as shown in FIGS. 23 and 24, first, one of the first side walls 30 is tilted inward to Then, as shown in FIGS. 25 and 26, the other first side wall 30 is folded inward and is superimposed on one first side wall 30.

  Then, as shown in FIG. 27, with respect to the first side wall 30 folded first, the rotation pin 39S moves to the lower end portion of the pin engagement groove 19J, and the pin support protrusion 39C becomes the recess bottom of the hinge recess 19 By contacting the wall 19A, the base end portion of the first side wall 30 on the rotation center side is held at a position spaced above the bottom wall 12, while the tip end portion on the side away from the rotation center is the bottom wall. 12 abuts. That is, the first side wall 30 that is folded first is in a folded state in a tilted posture in which the tip end portion is located below the base end portion and the tip end is lowered.

  On the other hand, with respect to the first side wall 30 folded later, the rotating pin 39S is held at a position near the upper end of the pin engaging groove 19J by contacting the first side wall 30 folded first. Then, the first side wall 30 folded later is placed in a folded state with an inclined posture with its tip raised, and is arranged at a position translated from the first side wall 30 folded first. In addition, a part of the upper first side wall 30 protrudes upward from the first support protrusion 13.

  Next, the pair of second side walls 50, 50 are folded so as to fall inward. Then, as shown in FIG. 28, each 2nd side wall 50 is settled between the center support protrusion 17 and the 2nd support protrusion 14, and the front end surface in the side part protrusion walls 54 and 54 of each 2nd side wall 50 is. The abutting surfaces 13J and 13J of the first support protrusions 13 and 13 are brought into contact with each other, and the entire box 10 is folded. In this folded state, the portion of the first side wall 30 that protrudes upward from the first support protrusion 13 fits between the side protrusion walls 54, 54 of each second side wall 50. Further, the outer surface of the main plate wall 51 in the second side wall 50 is disposed at a position substantially equivalent to the horizontal step surface 20 of the bottom base 11.

  As shown in FIG. 31, the lid 10 is fitted with the lid side wall 75 of the lid 70 on the outside of the support upper surface protrusion 22 group at the upper end of the bottom base 11 with respect to the folded box 10. Can be combined. At this time, the lid lower surface rib 80 of the lid body 70 is received in the rib receiving groove 23 of the bottom base 11. Further, the total height of the display stand 90 formed by combining the folded box 10 and the lid 70 is exactly the total height of the display stand 90 formed by combining the assembled box 10 and the cover 70. / 3 times the height.

  In order to put the folded box 10 into the assembled state, an operation reverse to the above-described operation is performed. That is, the pair of second side walls 50 and 50 are rotated and raised. Then, the pin support protrusion 39C of the hinge protrusion 39 on the second side wall 50 is positioned in contact with the inner surface of the second outer wall 14B (see FIG. 9) in the hinge recess 19 of the second support protrusion 14. The lower surface of the lower edge reinforcing rib 52 on the side wall 50 comes into contact with the upper surface 14J of the second support protrusion 14 so that the second side wall 50 stands up on the second support protrusion 14.

  As shown in FIG. 25, when both the second side walls 50 and 50 are in an upright state, the pair of first side walls 30 and 30 that are folded in an overlapping manner are rotated in order from the top. In order to raise the first side wall 30 on the upper side, for example, a part of the first side wall 30 protruding above the first support protrusion 13 of the bottom base 11 (for example, the fitting block 40 or the like) is placed. Wake up. On the other hand, since there is only a slight gap between the tip portion of the lower first side wall 30 and the inner side surface 13E of the first support protrusion 13, it is difficult to insert a hand there (FIG. 27). reference).

  However, the first side wall 30 is folded in an inclined posture with the tip lowered, and the base end side floats from the bottom wall 12, and the central rectangular recess 30 </ b> A is formed on the base end side of the first side wall 30. A finger can be inserted between the bottom wall 12 and the first side wall 30 through the central rectangular recess 30A. Further, the central lateral rib 35B formed at the edge of the central rectangular recess 30A is formed with a manual feed portion 35C by notching a part thereof, whereby the bottom wall 12 and the first side wall 30 are The space between them becomes wider and you can easily insert your fingers there. In addition, it is possible to hook a finger on a portion of the central lateral rib 35B where the protruding amount from the main plate wall 31 is reduced by forming the manual feed portion 35C, and the first side wall 30 can be easily tilted upward. It can be raised until it is in a posture.

  Then, after lifting the fitting block 40 of the first side wall 30 to a position higher than the first support protrusion 13, the first side wall 30 may be raised by placing the hand on the fitting block 40. Then, in the process of raising the first side wall 30, as shown in FIG. 20, the first and second side edge reinforcements of the first side wall 30 are made in order from the lower side of the engaging protrusions 62 of the second side wall 50. While being fitted between the ribs 32 and 33 (see FIG. 22), the lateral rib 35 between the first and second side edge reinforcing ribs 32 and 33 is between the engaging protrusions 62 and 62. It is received in the protrusion dividing groove 62M.

  Here, when the first side wall 30 is raised, for example, the second side wall 50 is slightly tilted inward from the normal standing state, and the engaging protrusions 62 group is reinforced by the first and second side edges. Even if it is not opposed to the opening between the ribs 32 and 33, the side edge portion of the first side wall 30 is brought into a normal standing state by slidingly contacting the inclined guide surface 60 </ b> A of the side protrusion 60 in the second side wall 50. be able to. Then, the second side edge reinforcing rib 33 of the first side wall 30 moves along the protruding flat surface 60B at the tip of the side protrusion 60, and the engaging protrusion 62 group is smoothly uneven in the side engaging groove 34M. Can be engaged.

  Immediately before the first side wall 30 stands upright, the side wall locking part 33K (second side edge) of the first side wall 30 is formed on the guide slope 59A of the side wall locking part 59 (see FIG. 19) of the second side wall 50. The upper end portion of the reinforcing rib 33 is in sliding contact, and a wall portion (for example, the side protruding wall 54) between the side wall locking portion 59 and the engaging protrusion 62 in the second side wall 50 is slightly elastically deformed. Further, when the first side wall 30 is further rotated in the standing direction, the pin support protrusion 39C of the hinge protrusion 39 on the first side wall 30 of the first side wall 30 is similar to the second side wall 50. Positioned in contact with the inner surface of the first outer wall 13B (see FIG. 9) in the hinge recess 19, the lower surface of the lower edge reinforcing rib 36 in the first side wall 30 contacts the upper surface 13J of the first support protrusion 13, The first side wall 30 stands up on the first support protrusion 13. When the first side wall 30 is in the standing state, the side wall locking portion 33K of the first side wall 30 passes through the side wall locking portion 59 of the second side wall 50 and a part of the second side wall 50 that is elastically deformed is As shown in FIG. 21, the engagement surface 59 </ b> B of the side wall locking portion 59 of the second side wall 50 engages with the side wall locking portion 33 </ b> K of the first side wall 30, and the first side wall 30 stands up. It is locked to. Thereby, the whole box 10 will be in an assembly state.

  When the box 10 is in an assembled state, as shown in FIG. 21, the corner protrusions 57 of the second side wall 50 overlap the block sub front wall 41D of the corner fitting block 41 in the first side wall 30, and the corner protrusions 57 The outer surface and the outer surface of the block front wall 41C in the corner fitting block 41 are flush with each other, and all the upper surfaces of the fitting blocks 40 and 56 and the corner fitting block 41 are flush. Further, the distance L1 from the outer surface of one block side wall 41B in the corner fitting block 41 to the outer surface of the block front wall 56C in the fitting block 56 having the corner projecting pieces 57 is the lateral length of each fitting block 40, 56. It becomes the same as the total length in the direction. Further, as shown in FIG. 1, the step horizontal surface 25 of the first side wall 30 and the step horizontal surface 25 of the second side wall 50 are flush with each other. As a result, a frame-like step horizontal surface 25 is formed at a position near the upper end of the entire outer surface of the box 10, and the fitting blocks 40, 56 group and corners are formed inside the frame-like step horizontal surface 25. A frame-shaped fitting wall 10K composed of the fitting block 41 group is formed.

  As shown in FIG. 1, the lid side wall 75 of the lid body 70 can be fitted to the outside of the frame-shaped fitting wall 10K on the upper surface of the box body 10 in the assembled state (see FIG. 30). Then, as shown in FIG. 29, the rotation restricting protrusion 29 group is received inside the frame-shaped fitting wall 10K, and the inward turning of the first and second side walls 30, 50 is restricted. . More specifically, in the present embodiment, the rotation restricting protrusions 29 are arranged at the four corners of each of a pair of square areas formed by dividing the lower surface of the lid body 70 in the longitudinal direction. The rotation restricting protrusions 29 can be disposed opposite to both ends of the second side wall 50 in the horizontal direction, and the first side wall 30 on the long side is paired at the center in addition to the both ends of the horizontal direction. The rotation restricting protrusions 29 and 29 can be arranged to face each other. As a result, inadvertent rotation of the first and second side walls 30 and 50 can be effectively prevented, and with respect to the first side wall 30 on the long side, the lateral central portion is bent and deformed inward. Can also be prevented.

  Further, as shown in FIG. 32, the two box bodies 10 and 10 are arranged so that the long side portions thereof are adjacent to each other so that the overall planar shape is a square, and the two box bodies 10 and 10 are vertically and horizontally. Cover one half of each of the two boxes 10 and 10 with one lid 70 having the opposite, and fit each half of both frame-shaped fitting walls 10K and 10K inside the one lid 70. You can also. Similarly, the remaining half surfaces of the two box bodies 10 and 10 are covered with other lid bodies 70, and the two lid bodies 70 straddle the two box bodies 10 and 10 as shown in FIG. , 70 can be fitted together to connect the display stands 90, 90 together.

  Moreover, when the two lid bodies 70 and 70 are fitted over the two box bodies 10 and 10 in this way, and when the lid body 70 and the box body 10 are fitted in the same vertical and horizontal directions ( 30), the arrangement of the rotation restricting protrusions 29 in each box 10 is the same. As a result, even when the two lid bodies 70, 70 are fitted across the two box bodies 10, 10, the rotation restricting protrusions 29 are used to move the first and second side walls 30, 50 to the inside. While being able to prevent rotation, bending deformation of the central portion of the first side wall 30 on the long side can also be prevented.

  Furthermore, as shown in FIG. 1, the frame-shaped fitting wall 10 </ b> K is divided into N equal parts (specifically, four equal parts) in the short direction of the planar shape of the box 10 among the short side portions thereof. A dividing groove 24 is formed at a partitioning position and a partitioning position that divides the longitudinal direction of the planar shape of the box body 10 in the long side portions of the frame-shaped fitting wall 10K into 2N equal parts (specifically, eight equal parts). Therefore, the lid side wall 75 of the lid body 70 is received in an arbitrary dividing groove 24, and the lid is covered in units of 1 / N (for example, 1/4) of the overall length of the box body 10 in the short direction. The body 70 can be positioned by moving vertically and horizontally with respect to the box 10.

  Furthermore, when the two lid bodies 70 are stacked, the upper lid body 70 can be fitted to the outside of the square protrusion 28 group of the lower lid body 70, so as shown in FIG. A plurality of bodies 70 can be stacked and used as the display stand 90. In addition, the main flat plate 71 is formed with the lid upper surface groove 27 disposed at the same partitioning position as the dividing groove 24 and the lid lower surface rib 80. Therefore, when the lids 70 and 70 are overlapped with each other, the box 10 As in the case where the lid 70 is stacked on the upper lid 70, the upper lid 70 is moved vertically and horizontally with respect to the lower lid 70 in units of 1 / N of the total length of the lid 70 described above. can do.

  Further, as shown in FIG. 27, a lower surface fitting projection wall 15K protrudes from the lower surface outer edge portion of the box body 10, and the rectangular projection portion 28 of the lid body 70 is fitted inside the lower surface fitting projection wall 15K. You can also When the box body 10 is stacked on the lid body 70, the box body 10 is moved vertically and horizontally with respect to the lower lid body 70 in units of 1 / N of the total length of the box body 10 described above. Can be positioned.

  Now, as shown in FIGS. 29 and 33, when an exhibit is placed on the display stand 90 in which the lid body 70 is assembled to the box 10 in the assembled state, a load is received from the exhibit and the first In addition, the second side walls 30 and 50 are stretched between the lid 70 and the bottom base 11. At this time, the longitudinal ribs 38 extending in the entire longitudinal direction of the first side wall 30 and the vertically long rib groups such as the first and second side edge reinforcing ribs 32 and 33 are also stretched between the lid 70 and the bottom base 11. It becomes a state. The first and second side edge reinforcing ribs 32 and 33 are arranged together on the side edge portions of the first side walls 30, and the vertically long rib groups are densely arranged on both side edge portions of the first side wall 30. Therefore, the buckling strength of each first side wall 30 is intensively enhanced at both side edges provided with the side wall locking portions 33K. Further, the buckling strength of the second side wall 50 is increased by side protruding walls 54, 54 formed by bending both side portions thereof at a right angle. Then, the engaging protrusions 62 group protruding from the side protrusion walls 54, 54 are uneven in the side engaging groove 34 </ b> M composed of the first and second side edge reinforcing ribs 32, 33 and the groove bottom wall 34. Since the side protruding walls 54 and 54 are reinforced by the engagement, the buckling strength of the second side wall 50 is also intensively increased at the side edges provided with the side wall locking portions 59. As a result, the engagement between the side wall locking portions 33K and 59 is difficult to be inadvertently released, and an increase in the weight of the box 10 itself due to the strength increase can be suppressed, and the allowable load weight of the box 10 can be increased as compared with the prior art. it can.

  Further, since both end portions of the lateral rib 35 communicate between the first and second side edge reinforcing ribs 32, 33, the first and second side edge reinforcing ribs 32, 33 reinforce each other, This also increases the buckling strength at both side edges of the first side wall 30. Here, the lateral rib 35 is unevenly distributed on the back side between the first and second side edge reinforcing ribs 32, 33, and the engaging protrusions 62 are unevenly fitted on the front side of the lateral rib 35. However, in the present embodiment, since the projecting portion dividing groove 62M for receiving the lateral rib 35 is provided in the engaging projecting portion 62 group, the lateral rib 35 is formed by the first and second side edge reinforcing ribs 32, 33. It is possible to enhance the reinforcement of the first and second side edge reinforcing ribs 32 and 33 by the lateral rib 35 by being arranged in the entire depth direction between them. Furthermore, in the box body 10 of the present embodiment, the rotation restricting protrusions 29 group provided in the lid body 70 are arranged inside the first and second side walls 30, 50, and the first and second side walls 30. , 50 is regulated so that the allowable load weight of the box body 10 can be increased as compared with the prior art.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) In the said embodiment, although the example which applied this invention to the box 10 used as the display stand 90 by fitting the cover body 70 was shown, it did not fit a cover body and it turned upside down. The present invention may be applied to a box used as an exhibition stand with the bottom base disposed above the first and second side walls and a box used as a storage box.

(2) Although the plurality of engaging protrusions 62 in the box 10 of the above embodiment have a rectangular parallelepiped shape extending in the vertical direction, for example, the plurality of engaging protrusions 62 may be formed in a cubic shape.

(3) Although the side wall locking portions 33K and 59 in the box 10 of the above embodiment are integrally formed with the first and second side walls 30 and 50, they may not be integrally formed. For example, as disclosed in Japanese Patent Application Laid-Open No. 2009-126574, a lock bar is assembled in a movable state on the first side wall, and a tip disposed on the side edge of the first side wall among the lock bars. The portion may be a “side wall locking portion” according to the present invention.

DESCRIPTION OF SYMBOLS 10 Box 11 Bottom base 12 Bottom wall 30 1st side wall 32 1st side edge reinforcement rib (vertically long flat plate wall)
33 Second side edge reinforcement rib (vertical flat plate wall)
33K, 59 Side wall locking portion 35 Horizontal rib (first horizontal rib)
50 Second side wall 51 Main plate wall 53 Upper edge reinforcing rib (second lateral rib)
54 Side Projection Wall 59A Guide Slope 59B Engagement Surface 62 Engagement Projection 62M Projection Dividing Groove 70 Lid 90

Claims (4)

A rectangular parallelepiped shape having an open top surface, a pair of first side walls facing each other and the remaining pair of second side walls in the rectangular parallelepiped are rotatably connected to an outer edge portion of the bottom base including the bottom wall. The pair of first side walls are folded on the bottom wall, and then the pair of second side walls are folded on the first side wall to be folded, while the pair of second side walls are folded. The first pair of first side walls are erected from the first side wall to be in an assembled state, and the first side walls are engaged with each other by engaging the side wall locking portions provided on the side edges of the first side wall and the second side wall. In a box body in which the side wall is locked in an upright state, and used as an exhibition stand with a lid attached or upside down, or a box body used as a storage box,
The lid and other side wall tip abutment arranged side by side for each side edge of each first side wall, extending in parallel across the entire top and bottom of each first side wall and abutting on the tip end of the first side wall A pair of vertically long flat plate walls that are stretched against a load that the box receives from above between an object and the bottom base;
A side engaging groove formed by closing the inner surface side of the first side wall in the whole or a part of the pair of vertically long flat plate walls with a groove bottom wall;
Side protruding walls formed by bending both sides of the second side wall at right angles to the first side wall;
A box body comprising: an engaging protrusion that protrudes from a front end edge of the inner surface of the side protrusion wall and engages with the side engaging groove.   2. The box according to claim 1, further comprising a first lateral rib extending across the entire lateral direction of the inner side surface of the first side wall and having both end portions communicating between the pair of longitudinal flat plate walls. body.   The engaging projection is divided into a plurality of projection dividing grooves extending in the vertical direction and provided in the middle of the vertical direction, and is received in the projection dividing groove between the pair of vertically long flat plate walls. The box according to claim 1, wherein a first lateral rib is provided. A second lateral rib extending in the lateral direction at a position close to the upper end of the inner side surface of the second side wall and having both end portions connected to the side protruding wall is provided, and each position near the both ends in the longitudinal direction of the second lateral rib is provided. While projecting toward the first side wall to serve as the side wall locking portion of the second side wall, the vertical plate wall on the second side wall side of the group of vertical plate walls is locked to the side wall of the first side wall. And
The side wall locking portion of the second side wall is orthogonal to the inner side surface of the second side wall, and engages with the side wall locking portion of the first side wall; The box according to any one of claims 1 to 3, further comprising a guide slope disposed on an opposite side and inclined with respect to an inner surface of the second side wall.

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