JP2020033042A - Folding container - Google Patents

Abstract

To provide a folding container capable of performing assembly work stably.SOLUTION: In a folding container 10, a joining projection part 14 and a joining hole 23 are provided on the side closer to the rotation center of a first side wall 11 and a second side wall 21 than an elastic piece 15 (that is, on the lower side). Then, before the second side wall 21 comes into contact with a locking protrusion part 16 of the elastic piece 15, the joining protrusion part 14 starts to be inserted in the joining hole 23 and they are engaged with each other, and the first side wall 11 is restricted to be inclined to the outside. Thus, assembly work of the folding container 10 can be stabilized.SELECTED DRAWING: Figure 16

Description

  The present disclosure relates to a folding container in which a pair of first side walls facing each other and a pair of remaining second side walls are rotatably connected to an outer edge of a base member having a planar quadrilateral shape.

  As a folding container of this type, when the second side wall is erected in a state where the first side wall is erected, the lock portion provided on the first side wall is pushed by the second side wall and elastically deforms, and the second side wall passes by. There is known a device that restricts the lock portion from elastically returning and the second side wall falling inward (for example, see Patent Document 1).

JP-A-2002-154536 (paragraph [0017] and FIG. 7)

  However, in this type of folding container, when the second side wall is erected in a state where the first side wall is erected, the first side wall may be inclined outward, which may cause a problem that it is difficult to assemble. On the other hand, there is a demand for the development of a foldable container capable of stably assembling.

  According to a first aspect of the present invention, a side wall is rotatably connected to each outer edge of a base member having a planar shape, and a pair of first side walls facing each other among the side walls. An assembled state in which a pair of second side walls is erected after the side wall is erected, and a folded state in which the second side wall is laid on the base member and the first side wall is laid on the second side wall. A foldable container that can be changed to a tatami state, wherein when the second side wall is erected, a lock portion provided on one of the first and second side walls includes the first and second side walls. The other side wall of the second side wall is pushed and elastically deformed, and when the other side wall passes by the lock part, the lock part elastically returns and the first side wall and the second side wall are erected. In the folding container, the first side wall and the second side wall An engagement portion that engages with each other in the assembled state to regulate the movement of the first side wall in the rotation direction. When the side wall is raised, the lock portion and the other side wall are engaged with each other before they come into contact with each other.

  In the invention according to claim 2, the second engaging portion provided on the second side wall of the engaging portion is formed in the thickness direction inward from a horizontal end of the second side wall. The first engagement portion provided on the first side wall of the engagement portion protrudes from the first side wall toward the second side wall, and is received by the second engagement portion. The folding container according to claim 1, wherein

  The invention according to claim 3 is the folding container according to claim 2, wherein the first engagement portion extends horizontally or substantially horizontally toward the second side wall and then bends downward.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the engaging portion is disposed below a half of a height of the first side wall and the second side wall. It is a foldable container.

  In the folding container according to the first aspect, before the lock portion provided on one side wall and the other side wall come into contact with each other, the engagement portion engages and regulates the movement of the first side wall in the rotation direction. Therefore, when the second side wall is erected in a state where the first side wall is erected, inclination of the first side wall to the outside is restricted, and the assembling work can be stabilized.

  In the folding container according to the second aspect, since the second engaging portion is cut out over the entire thickness of the second side wall, the first engaging portion is located inside the first side wall in the horizontal direction. Can be arranged. Accordingly, the first engagement portion and the second engagement portion engage at an earlier stage, so that the assembling work can be further stabilized.

  In the folding container according to the third aspect, since the second engaging portion is bent downward, the first engaging portion and the second engaging portion can be engaged at an earlier stage.

  In the folding container according to the fourth aspect, since the engaging portion is disposed below the half height of the first side wall and the second side wall, the engaging portion is engaged earlier than in the case where the engaging portion is disposed above. The joint can be engaged.

1 is a perspective view of a folding container according to the present disclosure. Perspective view of a folded container in a folded state Perspective view of the lower side of the folding container Partial enlarged perspective view of the bottom wall A partially enlarged perspective view of a folded container in a folded state. A partially enlarged perspective view of a folding container in which only the second side wall is folded. Partially enlarged perspective view of the first side wall Perspective view of a folding container in which only the second side wall is folded. Perspective view of a folding container with the flap standing upright Partially enlarged perspective view with the flap in a horizontal position Partially enlarged perspective view of a folding container Partially enlarged perspective view of a folding container with a flap standing upright. Partially enlarged side sectional view of a folding container Partially enlarged perspective view of the first side wall Partially enlarged perspective view of the second side wall Partially enlarged side sectional view of a folding container in a state in which the second side wall is being raised. Partially enlarged cross-sectional view of a folding container in a state where a first side wall is overlaid on a bottom wall. Partially enlarged perspective view of a folding container according to a modification.

[First Embodiment]
Hereinafter, an embodiment of the folding container 10 shown in FIGS. 1 to 17 will be described. As shown in FIG. 1, the folded container 10 of the present embodiment has a rectangular parallelepiped shape with a rectangular planar shape and an open upper surface, and an assembled state in which the side walls 11 and 21 connected to the bottom wall 30 stand upright. The state can be changed to a folded state (see FIG. 2) in which the first and second parts 11 and 21 are folded so as to overlap the bottom wall 30. Hereinafter, the short direction of the bottom wall 30 is referred to as a first horizontal direction H1, and the long direction is referred to as a second horizontal direction H2.

  A pair of long-side banks 31, 31 and a pair of short-side banks 32, 32 project from the four outer edges of the bottom wall 30, respectively. As shown in FIG. 3, the bottom wall 30 is provided with a lower surface protruding portion 39 formed by extending ribs in a lattice pattern on substantially the entire inner portion of the bank portion 31 and the bank portion 32. 32 project below the lower surface. Also, a first lower surface groove 35A extending in the first horizontal direction H1 and a second lower surface groove 35B extending in the second horizontal direction H2 are formed so as to divide the lower surface protrusion 39 into four equal parts. When small containers (not shown) each having a size obtained by dividing the folding container 10 of the present embodiment into four equal parts are arranged in two rows and two columns, and the folding container 10 of the present embodiment is placed thereon, A quarter of the lower projection 39 is fitted into the upper opening of the container.

  The back side of the first lower surface groove 35A is a central bank 33 protruding from the upper surface of the bottom wall 30, as shown in FIG. The central bank portion 33 has a structure in which a flat plate portion 33S above the lower surface projection 39 of the bottom wall 30 is raised, has a horizontal surface 33A at a top portion, and has gentle slopes 33B, 33B on both sides thereof. . As shown in FIG. 3, the flat plate portion 33S is recessed upward in the first lower surface groove 35A, and a plurality of ribs 35C are formed therein. It is flush.

  As shown in FIG. 1, a pair of first side walls 11, 11 on the long side of the side walls 11, 21 are hinged to a pair of bank portions 31, 31 on the long side, and a pair of first side walls 31, 31 on the short side. The pair of second side walls 21 and 21 are hinged to the pair of short side bank portions 32 and 32.

  The hinge connecting portion between the side walls 11, 21 and the bank portions 31, 32 has, for example, the following structure. That is, as shown in FIGS. 1 and 4, a plurality of recesses 60 having openings on the upper surface and the inner surface are formed in the bank portions 31 and 32. Further, a part of the opening of the concave portion 60 on the upper surface forms a wide portion, and the opening other than the wide portion is narrower than the inside of the concave portion 60.

  On the other hand, a plurality of hinge arms 61 corresponding to the plurality of recesses 60 hang down from the lower surfaces of the side walls 11 and 21, as shown in FIGS. Each hinge arm 61 is provided with hinge protrusions 61A, 61A protruding from both sides from the lower end. The hinge projections 61A, 61A are received in the recess 60 from the wide portion of the opening of the recess 60, and are engaged with the opening edges from the inside. As a result, the side walls 11 and 21 are positioned between the upright postures standing on the bank portions 31 and 32 as shown in FIG. 1 and the folded postures stacked on the bottom wall 30 as shown in FIG. And the rotation outward from the standing posture is restricted.

  In addition, as shown in FIG. 4 and FIG. 5, the bank 31 on the long side has a stepped structure having a step surface 31 </ b> D on the inner surface, and correspondingly, the lower surface of the first side wall 11 is It has a stepped structure having a projecting wall 11U protruding from the entire inner edge portion (see FIGS. 6 and 7). As shown in FIG. 6, when the first side wall 11 is in the upright posture, the upper and lower steps of the stepped structure of the first side wall 11 become the upper and lower steps of the stepped structure of the bank 31. Abut.

  As shown in FIG. 1, in the assembled state, the pair of second side walls 21 and 21 are located between the pair of first side walls 11 and 11. This restricts the first side walls 11, 11 from falling inward on the second side walls 21, 21. Further, the bank 31 on the long side is higher than the bank 32 on the short side by the thickness of the second side wall 21. As a result, as shown in FIG. 8, the pair of second side walls 21 and 21 can be folded first, and the pair of first side walls 11 and 11 can be folded over the second side walls 21 and 21. (See FIG. 2).

  As shown in FIG. 1, in order to increase the strength of the folded container 10 in the assembled state, the first flaps 40, 40 are hinged to the upper edges of the first side walls 11, 11, and the second side walls 21 are provided. , 21 are hinged to the second flaps 50, 50, and these flaps 40, 50 are rotatable between a horizontal posture shown in FIG. 1 and an upright posture shown in FIG. Has become. The structure of the hinge connection between the side walls 11, 21 and the flaps 40, 50 is substantially the same as the structure of the hinge connection between the side walls 11, 21 and the bank portions 31, 32.

  As shown in FIG. 9, the flaps 40 and 50 have a strip shape extending along the upper edges of the side walls 11 and 21. Reinforcing ribs 40L and 50L are stretched around the inner surfaces 40N and 50N, and the outer surfaces are formed. 40G and 50G are flat.

  As shown in FIGS. 1 and 10, the side surfaces 49, 49, which are end faces in the longitudinal direction of the first flap 40, are adjacent to the inner surfaces of the second side walls 21, 21 when the first flap 40 is in the horizontal posture. Further, side wall engaging protrusions 43, 43 project from side surfaces 49, 49 of the first flap 40, and side wall engaging recesses 24, 24 for receiving the side wall engaging protrusions 43, 43 are formed on each second side wall 21. Is formed.

  At both ends in the longitudinal direction of the second flap 50, there are provided horizontal adjacent portions 58 that are horizontally adjacent to the distal end surface 40 </ b> S of the first flap 40. Further, a part of the distal end surface 40S of the first flap 40 is a horizontal adjacent portion 48 adjacent to the horizontal adjacent portion 58 of the second flap 50. Then, the flap engaging protrusions 51, 51 protrude from the horizontal adjacent portion 58 of the second flap 50, and flap engaging holes 41, 41 for receiving the flap engaging protrusions 51, 51 are formed in the first flap 40. ing.

  As a result, when the first flap 40 and the second flap 50 are both in a horizontal posture, the first flap 40 and the second side wall 21 restrict the movement of each other in both the first horizontal direction H1 and the second horizontal direction H2. At the same time, both the first flap 40 and the second flap 50 are restricted from moving in both the first horizontal direction H1 and the second horizontal direction H2, so that the first side wall 11 and the second side wall 21 are deformed in and out. Can be prevented.

  As shown in FIG. 9, handle holes 11A, 11A are formed through the first side wall 11 at two locations in the lateral direction, and a handle hole 21A is formed at the center in the lateral direction of the second side wall 21. ing. A handle portion 31A is formed in the bank portion 31 directly below the handle holes 11A, 11A in the first side wall 11.

  As shown in FIGS. 8 and 11, side projecting walls 13 protrude from both sides of the inner surface of the first side wall 11 toward the second side wall 21, overlap the outer surface of the second side wall 21, and form the second side wall. It restricts outward deformation and tilting of 21.

  In detail, as shown in FIG. 11, on both sides of the first side wall 11, the whole of the first side wall 11 is bent at a right angle to the second side wall 21 side and slightly protrudes toward the second side wall 21 side. A ridge 19 is formed. Both ends of the bank 31 are bent at right angles to the bank 32 and project toward the bank 32 to support the side ridges 19 from below. A locking projection 19T is formed on the lower surface of the side ridge 19 so as to engage with the upper surface concave portion 31T formed on the upper surface of the bank portion 31 so that the first side wall 11 is locked in the upright posture. It has become. As shown in FIG. 12, the lower third of the inner corners of the side protrusions 19 in the second horizontal direction H <b> 2 are chamfered inclined portions 19 </ b> K. Is guided so that the second side wall 21 fits between the pair of first side walls 11 and 11.

  The side protruding wall 13 is formed from the upper end of the side protruding ridge 19 to a position closer to the center in the vertical direction, and further protrudes from the side protruding ridge 19 toward the second side wall 21. As shown in FIG. 10, the side protruding wall 13 is slightly thinner than the side protruding ridge 19, is disposed near the outer surface of the side protruding ridge 19, and is flush with the side protruding ridge 19. Having. As shown in FIG. 11, a reinforcing rib 21L is formed on an outer surface of the second side wall 21 so as to avoid upper portions of both side edges of the second side wall 21, and upper portions of the both side edges are formed by reinforcing ribs. The longitudinal plate portions 21E, 21E having no 21L are provided.

  At the upper end and the lower end of the side protruding wall 13, rectangular engagement holes 13A, 13A are formed. Then, the engagement projections 22 having a rectangular cross section projecting from the outer surface of the vertically long plate portion 21E of the second side wall 21 are fitted into the engagement holes 13A, 13A to prevent the first side walls 11, 11 from being deformed in and out. Regulating. As shown in FIG. 6, a guide surface 22 </ b> A is formed at the tip of the engagement protrusion 22 by chamfering a corner on a side away from the first side wall 11.

  As shown in FIG. 6, an elastic piece 15 is formed on a side portion of the first side wall 11 by separating a part of the first side wall 11 into a cantilever shape by a slit 12S. The elastic piece 15 extends in the up-down direction and the upper end side is a free end. In addition, a locking projection 16 projects from the upper end of the elastic piece 15 toward the inside of the folding container 10. The locking projection 16 is tapered toward the front and has inclined surfaces 16A on both sides. When the second side walls 21 and 21 are raised from the state where the pair of first side walls 11 and 11 are in the upright posture, the second side wall 21 slides against the inclined surface 16 </ b> A of the locking projection 16 and elastically moves. The piece 15 is bent outward, and the elastic piece 15 is elastically restored when the second side wall 21 overlaps the side protruding wall 13, and the locking protrusion 16 engages with the inner surface of the second side wall 21 as shown in FIG. Combine. Thereby, the second side wall 21 is fitted between the locking protrusion 16 and the side protrusion wall 13, and the movement of the second side wall 21 in and out is restricted.

  The outer inclined surface 16A of the two inclined surfaces 16A is steeper than the inner inclined surface 16A, so that the second side wall 21 is hardly inclined inward. Further, the surface of the locking projection 16 facing the side protruding wall 13 may be a surface parallel to the side protruding wall 13 instead of the inclined surface 16A.

  Here, when raising the second side walls 21 and 21 from the state where the pair of first side walls 11 and 11 are in the upright posture as shown in FIG. 4, for example, the elastic pieces 15 are not sufficiently elastically deformed. Due to the sliding contact between the second side wall 21 and the inclined surface 16 </ b> A of the locking projection 16, the first side wall 11 may be pushed outward from the standing posture and may be inclined. Then, a situation may occur in which the engaging protrusion 22 is not fitted into the engaging hole 13A and the folding container 10 cannot be brought into the assembled state. It is also conceivable that the first side wall 11 tends to be inclined outward on the bank 31 due to aging or the like, and the folding container 10 cannot be put into an assembled state.

  On the other hand, in the folding container 10 of this embodiment, as shown in FIG. 12, the elastic piece 15 is connected to the side closer to the rotation center of the first side wall 11 and the second side wall 21 (that is, the lower side). The protrusion 14 and the coupling hole 23 are provided. Hereinafter, the connection protrusions 14 and the connection holes 23 will be described in detail.

  As shown in FIG. 14, the connecting protrusion 14 is formed by making the front end of the prism projecting from the position below the side protrusion wall 13 toward the second side wall 21 side of the side protrusion 19 of the first side wall 11 at a right angle downward. It is bent and the whole is L-shaped. Further, the coupling protrusion 14 has a thickness that is substantially half the length of the side protrusion 19 in the second horizontal direction H <b> 2, and the inner side surface 14 </ b> S of the folding container 10 It is flush with the side surface 19A.

  As shown in FIGS. 12 and 15, the coupling hole 23 penetrates the side edge of the second side wall 21 and has an L-shape corresponding to the coupling protrusion 14 when viewed from the penetrating direction. A reinforcing rib 21L protrudes from the opening edge of the coupling hole 23. Further, a reinforcing rib 21L along a vertical side below the opening on the side surface of the second side wall 21 of the coupling hole 23 has a guide surface 23G inclined toward the side away from the first side wall 11 from the distal end toward the proximal end. Are formed.

  The coupling protrusions 14 and the coupling holes 23 are used to raise the second side walls 21 and 21 from a state in which the pair of first side walls 11 and 11 are in an upright posture as shown in FIG. 16 (see FIG. 4). Before the second side walls 21 and 21 come into contact with the locking projection 16 of the elastic piece 15, the coupling projection 14 is arranged to be inserted into the coupling hole 23 and engaged therewith. This restricts the first side wall 11 from tilting outward when the second side wall 21 is raised, so that the engagement protrusion 22 can be easily fitted into the engagement hole 13A, and the folding container 10 is assembled. Work can be stabilized. Further, even if the first side wall 11 is inclined outward before the coupling protrusion 14 starts to be inserted into the coupling hole 23, the hanging portion 14 </ b> A at the tip of the coupling protrusion 14 slides on the guide surface 23 </ b> G of the coupling hole 23. The connecting protrusions 14 are guided into the connecting holes 23 in contact with each other, and the inclination of the first side wall 11 is corrected. In the present embodiment, the coupling protrusions 14 and the coupling holes 23 are arranged such that the engagement portions are located below the half height of the first side wall 11 and the second side wall 21, but this is not restrictive. Not something.

  As shown in FIG. 6 and FIG. 17, the bank portion 32 is formed with protrusions 32 </ b> B and 32 </ b> C for receiving the side protrusions 13 and the coupling protrusions 14. In the folded posture, the side protruding walls 13 and the connecting protruding portions 14 are received by the protruding portion receiving portions 32B and 32C, and the side protruding ridges 19 overlap the upper surface of the bank portion 32, as shown in FIG.

  The description of the configuration of the folding container 10 of the present embodiment is as described above. Next, the operation and effect of the folding container 10 will be described.

  When folding the folding container 10, as shown in FIG. 9, the flaps 40 and 50 are in an upright posture, and the locking projections 16 and 16 are pushed outward from inside the folding container 10 to push the second side wall 21. You only have to push inward. Then, as shown in FIG. 8, the second side wall 21 is overlaid on the bottom wall 30. In addition, since the inclined surface 16 </ b> A is also formed on the outer side of the locking protrusion 16, the second side wall 21 can also be folded by strongly pressing the second side wall 21 inward.

  When the pair of second side walls 21 and 21 are overlaid on the bottom wall 30, the first side walls 11 and 11 are pushed inward. Then, as shown in FIG. 2, the first side walls 11, 11 are overlaid on the second side walls 21, 21, and the entire folding container 10 is in a folded state. In the folded state of the folding container 10, the pair of bank portions 31, 31 project above the first side walls 11, 11, and another folding portion is provided between the bank portions 31, 31. The lower surface projections 39 (see FIG. 3) of the tatami container 10 are fitted to each other, so that the foldable containers 10, 10 can be stacked.

  In order to put the folded container 10 in the folded state into the assembled state, the above operation is performed in reverse. That is, first, the first side walls 11, 11 are set in the upright posture, and then the second side wall 21 is rotated so as to be raised. At this time, the second side wall 21 may be shifted toward one of the pair of first side walls 11, 11, but is corrected by the inclined portion 19 </ b> K. Then, when the second side wall 21 approaches the standing posture, as shown in FIG. 16, after the coupling projection 14 starts to be inserted into the coupling hole 23, the second side wall 21 is inclined inside the locking projection 16. It comes into sliding contact with the surface 16 </ b> A and moves toward the side protruding wall 13 of the first side wall 11 while elastically deforming the elastic piece 15. When the second side wall 21 passes through the elastic piece 15, the elastic piece 15 is elastically restored, and the second side wall 21 is sandwiched between the side protruding wall 13 and the locking protruding portion 16, and is held in the upright posture. Then, the engaging projection 22 is fitted into the engaging hole 13A, and the folding container 10 is in an assembled state.

  Then, if necessary, the flaps 40 and 50 are tilted inward to a horizontal position. When another foldable container 10 is stacked on the foldable container 10 in which the flaps 40 and 50 are in the horizontal posture, the lower surface projection 39 of the upper foldable container 10 is folded down. The container 10 is fitted inside the upper portions of the side walls 11 and 21 protruding above the flaps 40 and 50, and the lateral displacement is regulated.

  As described above, in the conventional folding container, when raising the second side walls 21 and 21 from the state where the pair of first side walls 11 and 11 are in the upright posture, the second side wall 21 is engaged. Due to the sliding contact of the stop projection 16 with the inclined surface 16A, the first side wall 11 may be tilted outward from the standing posture, and a situation may occur in which the folding container 10 cannot be brought into the assembled state.

  On the other hand, in the folding container 10 of the present embodiment, before the second side wall 21 and the locking protrusion 16 come into contact with each other, the connecting protrusion 14 starts to be inserted into the connecting hole 23 and engages with the first side wall 21. Since the inclination of the folding container 10 is restricted, the assembling work of the folding container 10 can be stabilized. Further, since the guide surface 23G is formed in the coupling hole 23, even if the first side wall 11 is inclined outward before the coupling protrusion 14 starts to be inserted into the coupling hole 23, the tip of the coupling protrusion 14 may be formed. The hanging part 14 </ b> A slides on the guide surface 23 </ b> G of the coupling hole 23, and the coupling protrusion 14 is guided into the coupling hole 23, so that the inclination of the first side wall 11 is corrected.

  Further, the coupling hole 23 is formed to penetrate the side edge of the second side wall 21, whereby the coupling protrusion 14 can be arranged more inside the side edge of the first side wall 11. Since the connecting protrusions 14 are inserted into the connecting holes 23 earlier than when the connecting protrusions 14 are arranged outside, the assembling work can be further stabilized. When the depth of the coupling hole 23 and the thickness of the coupling projection 14 are the same, the coupling projection 14 and the inner surface of the coupling hole 23 come into contact with each other during the rotation operation of the second side wall 21 and are rotated by friction. Although it is conceivable that the thickness of the connecting projection 14 is approximately half the depth of the connecting hole 23, such a situation can be prevented.

  Furthermore, since the coupling protrusion 14 and the coupling hole 23 are disposed below the position of half the height of the first side wall 11 and the second side wall 21, the coupling protrusion is faster than when disposed above. The part 14 and the coupling hole 23 can be engaged. Moreover, since the coupling protrusion 14 is bent downward, the coupling protrusion 14 and the coupling hole 23 can be more quickly engaged. If the arrangement of the coupling projections 14 and the coupling holes 23 is too low, the distance between the coupling projections 14 and the coupling holes 23 and the locking projections 16 becomes longer, and the coupling projections 14 and the coupling holes 23 are engaged. Although it is conceivable that the first side wall 11 is inclined outward even though it is formed, in the present embodiment, the coupling protrusion 14 and the coupling hole 23 are closer to the center of the height of the first side wall 11 and the second side wall 21. Such a situation is prevented because it is arranged in a position.

  Further, since the guide surface 22A is formed at the tip of the engagement protrusion 22, the engagement protrusion 22 is formed by the guide surface 22A even if the first side wall 11 is slightly outwardly inclined from the standing posture. The inclination of the first side wall 11 is corrected by being guided by the engagement hole 13A. Further, since the first side wall 11 is held in the upright posture by the engagement between the locking projection 19T and the upper surface recess 31T (see FIG. 8), when the second side walls 21 and 21 are raised, the first side walls 11 and 11 are raised. Does not fall inward, and the second side wall 21 can be easily raised.

[Other embodiments]
(1) In the above embodiment, the planar shape of the folding container 10 is rectangular and the first side wall 11 is longer than the second side wall 21. However, the reverse is also possible, and the planar shape of the folding container 10 may be square. .

(2) In the above-described embodiment, the “lock portion” in the claims is provided on the first side wall 11 rising first, but may be provided on the second side wall 21 rising later. . For example, as shown in FIG. 18, a lock piece 15W slidable in the first horizontal direction H1 is provided on the second side wall 21W by being urged outward by an elastic portion (not shown), and the first side wall 11W is provided. It may be configured to be received in the receiving hole 11 </ b> X formed in the hole.

(3) The coupling protrusion 14 may not be L-shaped, and may be, for example, a linear shape extending in an oblique direction, or a circular shape. Further, the coupling projection 14 and the coupling hole 23 may have a structure like the engagement projection 22 and the engagement hole 13A.

(4) Further, the configuration may be such that the coupling protrusions 14 are disposed on the second side wall 21 that is raised later, and the coupling holes 23 are disposed on the first side wall 11 that is raised first.

(5) The coupling hole 23 does not have to penetrate the side edge of the second side wall 21.

(6) In the above-described embodiment, the flaps 40 and 50 are provided on the side walls 11 and 21, however, a configuration in which the flaps 40 and 50 are not provided may be employed.

DESCRIPTION OF SYMBOLS 10 Folding container 11 1st side wall 13 Side projection wall 13A Engagement hole 14 Coupling projection (engagement part, 1st engagement part)
15 Elastic piece (lock part)
Reference Signs List 16 locking projection 16A inclined surface 19 side projection 21 second side wall 22 engagement projection 22A guide surface 23 coupling hole (engagement part, second engagement part)
23G Guide surface 30 Bottom wall 31, 32 Embankment

1 is a perspective view of a folding container according to the present disclosure. Perspective view of a folded container in a folded state (A) A perspective view of the lower surface side of the folding container, (B) A partially enlarged perspective view of the lower surface side of the folding container. Partial enlarged perspective view of the bottom wall A partially enlarged perspective view of a folded container in a folded state. A partially enlarged perspective view of a folding container in which only the second side wall is folded. Partially enlarged perspective view of the first side wall Perspective view of a folding container in which only the second side wall is folded. Perspective view of a folding container with the flap standing upright Partially enlarged perspective view with the flap in a horizontal position Partially enlarged perspective view of a folding container Partially enlarged perspective view of a folding container with a flap standing upright. Partially enlarged side sectional view of a folding container Partially enlarged perspective view of the first side wall Partially enlarged perspective view of the second side wall Partially enlarged side sectional view of a folding container in a state in which the second side wall is being raised. Partially enlarged cross-sectional view of a folding container in a state where a first side wall is overlaid on a bottom wall. Partially enlarged perspective view of a folding container according to a modification.

As shown in FIG. 6, an elastic piece 15 is formed on a side portion of the first side wall 11 by separating a part of the first side wall 11 into a cantilever shape by a slit 12S. The elastic piece 15 extends in the up-down direction and the upper end side is a free end. In addition, a locking projection 16 projects from the upper end of the elastic piece 15 toward the inside of the folding container 10. The locking projection 16 is tapered toward the front and has inclined surfaces 16A on both sides. When the second side walls 21 and 21 are raised from the state where the pair of first side walls 11 and 11 are in the upright posture, the second side wall 21 slides against the inclined surface 16 </ b> A of the locking projection 16 and elastically moves. When the second side wall 21 overlaps the side protruding wall 13, the elastic piece 15 elastically returns, and the locking protrusion 16 engages with the inner surface of the second side wall 21 as shown in FIG. Combine. Thereby, the second side wall 21 is fitted between the locking protrusion 16 and the side protrusion wall 13, and the movement of the second side wall 21 in and out is restricted.

Here, when the second side walls 21 and 21 are raised from the state where the pair of first side walls 11 and 11 are in the upright posture as shown in FIG. 8 , for example, the elastic pieces 15 are not sufficiently elastically deformed. Due to the sliding contact between the second side wall 21 and the inclined surface 16 </ b> A of the locking projection 16, the first side wall 11 may be pushed outward from the standing posture and may be inclined. Then, a situation may occur in which the engaging protrusion 22 is not fitted into the engaging hole 13A and the folding container 10 cannot be brought into the assembled state. It is also conceivable that the first side wall 11 tends to be inclined outward on the bank 31 due to aging or the like, and the folding container 10 cannot be put into an assembled state.

The coupling protrusions 14 and the coupling holes 23 are used to raise the second side walls 21 and 21 from a state in which the pair of first side walls 11 and 11 are in an upright posture as shown in FIG. 16 (see FIG. 8 ) . Before the second side walls 21 and 21 come into contact with the locking projection 16 of the elastic piece 15, the coupling projection 14 is arranged to be inserted into the coupling hole 23 and engaged therewith. This restricts the first side wall 11 from tilting outward when the second side wall 21 is raised, so that the engagement protrusion 22 can be easily fitted into the engagement hole 13A, and the folding container 10 is assembled. Work can be stabilized. Further, even if the first side wall 11 is inclined outward before the coupling protrusion 14 starts to be inserted into the coupling hole 23, the hanging portion 14 </ b> A at the tip of the coupling protrusion 14 slides on the guide surface 23 </ b> G of the coupling hole 23. The connecting protrusions 14 are guided into the connecting holes 23 in contact with each other, and the inclination of the first side wall 11 is corrected. In the present embodiment, the coupling protrusions 14 and the coupling holes 23 are arranged below the position of half the height of the first side wall 11 and the second side wall 21, but the present invention is not limited to this.

As shown in FIGS. 5 and 6 , the bank portion 32 is formed with protrusions 32 </ b> B and 32 </ b> C for receiving the side protrusions 13 and the coupling protrusions 14. In the folded posture, the side protruding walls 13 and the connecting protruding portions 14 are received by the protruding portion receiving portions 32B and 32C, and the side protruding ridges 19 overlap the upper surface of the bank portion 32, as shown in FIG.

Further, since the guide surface 22A is formed at the tip of the engagement protrusion 22, the engagement protrusion 22 is formed by the guide surface 22A even if the first side wall 11 is slightly outwardly inclined from the standing posture. The inclination of the first side wall 11 is corrected by being guided by the engagement hole 13A. Further, since the first side wall 11 is held in the upright posture by the engagement between the locking projection 19T and the upper surface concave portion 31T (see FIGS. 5 and 7 ), the first side wall 21, 21 is raised when the second side wall 21, 21 is raised. The second side wall 21 can be easily raised without the inside 11 and 11 falling down.

DESCRIPTION OF SYMBOLS 10 Folding container 11 , 11W 1st side wall 13 Side protruding wall 13A Engagement hole 14 Coupling protrusion (engagement part, 1st engagement part)
15 Elastic piece (lock part)
Reference Signs List 16 locking projection 16A inclined surface 19 side projection 21 , 21W second side wall 22 engagement projection 22A guide surface 23 coupling hole (engagement part, second engagement part)
23G Guide surface 30 Bottom wall 31, 32 Embankment

Claims (4)

Side walls are rotatably connected to respective outer edges of the base member having a planar quadrilateral shape, and a pair of first side walls opposed to each other are erected from the side walls, and the other pair of second side walls is erected. A folded container that can be changed into an assembled state, and a folded state in which the second side wall is superimposed on the base member and the first side wall is superimposed on the second side wall,
When the second side wall is raised, a lock portion provided on one of the first and second side walls is elastically deformed by being pushed by the other side wall of the first and second side walls, When the lock portion elastically returns when the other side wall passes by the lock portion, the folding container keeps the first side wall and the second side wall in an upright state,
The first side wall and the second side wall are provided with an engagement portion that engages with each other in the assembled state to regulate a movement of the first side wall in a rotation direction,
When the first side wall is erected and the second side wall is erected, the engaging portions are engaged before the lock portion and the other side wall come into contact with each other. Tatami container. The second engaging portion of the engaging portion, which is provided on the second side wall, is cut out from the horizontal end of the second side wall to the inside in the entire thickness direction. ,
The first engaging portion provided on the first side wall of the engaging portion projects from the first side wall toward the second side wall, and is received by the second engaging portion. Foldable container.   The folding container according to claim 2, wherein the first engagement portion extends horizontally or substantially horizontally toward the second side wall and then bends downward.   4. The folding container according to claim 1, wherein the engaging portion is disposed below a position at a half of the height of the first side wall and the second side wall. 5.

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