JP5413981B2 - Folding container - Google Patents

Description

  According to the present invention, a pair of first side walls are rotatably connected to one opposing side of the rectangular bottom wall, and a pair of second side walls are rotatably connected to the remaining opposing sides. Further, the present invention relates to a folding container that is overlaid on a bottom wall in the order of the second side wall and is in a folded state, while being in an assembled state by standing in the order of the second and first side walls.

  Conventionally, in this type of folding container, a self-supporting engagement mechanism for holding the second side wall in an upright state before the first side wall is raised in order to smoothly perform the assembly work from the folded state. And the bottom wall. Specifically, in this type of folding container, a plurality of hinge arms hang down from the lower surfaces of the first and second side walls, and the support protruding wall protrudes upward from the entire outer edge of the bottom wall. Yes. In addition, a plurality of hinge recesses opened on the upper surface and the inner side surface are formed on the support projecting wall, and the lower ends of the hinge arms are rotatably connected to the hinge recesses. Then, a configuration in which the engaging protrusion protruding from the upper surface of the supporting protrusion wall is engaged with the engaging recess on the lower surface of the second side wall to make the second side wall self-supporting, and the engagement provided on the bottom surface of the engaging recess There has been known one provided with a mechanism for allowing a protrusion to engage and disengage with an engagement recess at the tip of a hinge arm on a second side wall (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2002-337777 (FIGS. 6, 11, 13, and 14)

  However, in the above-described conventional folding container having an engagement protrusion protruding from the upper surface of the support protrusion wall, the engagement protrusion is crushed when the folding container is stacked in a folded state. There was concern about the situation where the resultant strength weakened. Further, in the case where the bottom surface of the hinge recess has an engagement protrusion, if the distance from the hinge arm rotation center to the engagement protrusion is sufficiently secured, the interference between the hinge arm rotation area and the inner surface of the hinge recess is sufficient. On the other hand, if the distance from the pivot center of the hinge arm to the engagement recess at the tip is not sufficiently secured, it is difficult to secure a sufficient engagement force between the engagement recess and the engagement protrusion. . As a result, in the conventional one, the case where the self-supporting side wall is not stable may occur.

  This invention is made | formed in view of the said situation, and aims at provision of the folding container which can stabilize the self-supporting of a side wall conventionally.

In order to achieve the above object, a folding container according to the invention of claim 1 includes a rectangular bottom wall and a pair of first side walls disposed on a pair of opposite sides of the outer edge of the bottom wall. And a pair of second side walls disposed on the opposite pair of opposite sides as separate parts, and a support projecting wall projecting upward from the entire outer edge of the bottom wall, from each of the first and second side walls. Lower ends of a plurality of hanging hinge arms are rotatably connected to a plurality of hinge recesses opened to the upper surface and the inner surface of the support protrusion wall, and are arranged on the bottom wall in the order of the first and second side walls. While overlapping and folding, the second and first side walls stand in the order of assembly, and the pair of first side walls are sandwiched between the pair of second side walls, and the second side wall falls inward. Is prevented, and the engagement mechanism between the side portion of the first side wall and the inner surface of the second side wall prevents the first side wall from falling down and is assembled. In the folding container to be held, the second side wall includes at least one hinge arm side surface and the inner side surface of the hinge recess facing the side surface of the hinge arm in the direction of the pivot axis of the hinge arm. When the two side walls are erected, a pair of standing concavo-convex engaging portions are provided to engage with each other from the direction of the pivot axis of the hinge arm to hold the second side wall in an upright posture, and the side surface of the hinge arm and the hinge When one of the inner side surfaces of the recess is supported by one of the raised and recessed engaging portions and the second side wall is folded, the pair of raised and recessed portions are elastically deformed in the direction of the pivot axis of the hinge arm. It is characterized in that it is provided with an elastic support part that allows the engagement of the joint part to be released.

  According to a second aspect of the present invention, in the folding container according to the first aspect, each hinge arm that does not have the raised and recessed engaging portion hinges a plurality of arm-constituting projecting pieces suspended from the first or second side wall. An arm main body arranged oppositely in the direction of the axis of rotation of the arm and communicated by a connecting wall; and a pair of hinge shaft protrusions protruding in opposite directions from both side surfaces of the tip of the arm main body, Each hinge recess that does not have a raised / recessed engaging portion has a shape in which the inner surface opening that opens on the inner surface of the support projection wall is narrower than the upper surface opening and is arranged at the center of the upper surface opening, A pair of in-hole locking projections protrude in the thickness direction of the support projection wall from both side portions of the side surface sandwiching the inner side surface opening, and a pair is formed on the lower surface of the pair of in-hole locking projections. The lower end of the hinge arm is under the hinge recess. The hinge recess having a raised and recessed engaging portion that is pivotally connected to the opening portion is arranged with the inner side surface opening close to one end portion in the width direction of the upper surface opening, and the opening edge of one side portion of the inner side surface opening One of the upright engaging recesses having a sliding contact flat surface that is flush with the depth of the supporting protrusion wall in the thickness direction or a position closer to the back, and a part of the sliding contact flat surface is depressed. The hinge arm with a raised and recessed engaging portion is provided as an uneven engaging portion, and further has a structure with an in-hole engaging protrusion on the opposite side of the sliding contact flat surface across the inner surface opening. A hinge shaft protrusion is provided only on one side of the arm body, and a part of the arm component protrusion on the other side of the arm body is separated into a cantilever shape to provide an elastic piece as an elastic support part. The other side of the upright engaging projection that protrudes from the tip of the piece and can be engaged with the upright engaging recess Characterized in place with a standing concavo-convex engaging section.

  The invention according to claim 3 is characterized in that, in the folding container according to claim 2, the standing engagement recess has a groove shape extending in the vertical direction and having an upper end opened to the upper surface of the support protruding wall. Have.

  According to a fourth aspect of the present invention, in the folding container according to any one of the first to third aspects, at least three or more hinge arms are provided on each second side wall, and the plurality of hinges are provided. Only the hinge arm located at the center of the arms has a feature in that the raised and recessed engaging portions are provided.

[Invention of Claim 1]
In the folding container according to claim 1, when the second side wall is erected from the folded state, the pair of erected concave / convex engaging portions engages with each other between the hinge arm and the hinge concave portion, and the second side wall is in the upright state. And is independent. Here, in the present invention, since the pair of standing concavo-convex engaging portions are arranged on the side surface of the hinge arm and the inner side surface of the hinge recess facing each other in the rotation axis direction of the hinge arm, the folding container is There is no possibility that the raised / recessed engaging portion protrudes upward as in the conventional case when folded, and the raised / recessed engaging portion is crushed by contact with another folding container and the engaging force is weakened. Also disappear. In addition, the distance from the pivot center of the hinge arm to the standing concave / convex engaging portion can be secured larger than the conventional one having a portion corresponding to the standing concave / convex engaging portion on the bottom surface of the hinge concave portion. It becomes possible to increase the engaging force between the concave and convex engaging portions. Thereby, the self-supporting of the second side wall that is raised first when the folded state is changed to the assembled state is more stable than before.

[Invention of claim 2]
According to the configuration of the folding container of claim 2, the hinge arm and the hinge recess having the standing concave / convex engaging portion are connected to one end portion in the width direction of the normal hinge arm and the hinge concave portion having no standing concave / convex engaging portion. Since the structure is changed, the design is facilitated. In addition, the hinge arm having the raised and recessed engaging portion has a hinge shaft protrusion and is pivotally supported by the hinge recessed portion like the normal hinge arm. The engagement and disengagement operations between the engaging portions are also stabilized.

[Invention of claim 3]
The standing engagement concave part of the folding container according to claim 3 has a groove shape extending in the vertical direction and the upper end part is open to the upper surface of the support projecting wall. The structure of the resin mold is simplified and the mold production cost is reduced.

[Invention of claim 4]
In the folding container according to claim 4, since the hinge arm having the standing uneven engaging portion is arranged at the center of the plurality of hinge arms, it has the standing uneven engaging portion as compared with the case where the hinge arm is arranged at a position other than the center. The distance from the hinge arm to the other most distant hinge arm is reduced. Thereby, the dispersion | variation in the engagement depth of the standing uneven | corrugated engagement parts resulting from the dispersion | variation in the dimension of a 2nd side wall and a bottom wall can be suppressed.

The perspective view of the assembly state of the folding container which concerns on 1st Embodiment of this invention A perspective view of the folded state of the folding container The perspective view in the middle of rotation of the 1st side wall of a folding container Perspective view of first side wall Perspective view of second side wall Perspective view of hinge arm Bottom wall perspective view Partially enlarged perspective view of bottom wall Flat section of hinge recess and hinge arm Perspective view with part of the folding container broken Perspective view with part of the folding container broken The perspective view of the hinge arm which concerns on the modification of this invention

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the folding container 10 according to the present embodiment has a pair of first side walls 11, 11 having a lower end pivoted on a pair of short sides of an outer edge of a rectangular bottom wall 30. The lower end portions of the pair of second side walls 21 and 21 are rotatably coupled to the pair of long side portions. Then, as shown in FIG. 2, the pair of first side walls 11, 11 are overlaid on the bottom wall 30, and then the pair of second side walls 21, 21 are overlaid on them so as to be folded. Can do. As shown in FIG. 3, when the pair of first side walls 11, 11 are raised after the pair of second side walls 21, 21 are raised, the assembled state shown in FIG. 1 is obtained. In the assembled state, the pair of first side walls 11, 11 are sandwiched between the pair of second side walls 21, 21 to prevent the second side walls 21, 21 from falling down and The engagement mechanism 50 (see FIG. 4) between the side portion and the inner surface 21N of the second side wall 21 prevents the first side wall 11 from falling down, and thereby the folding container 10 is held in the assembled state.

  Specifically, as shown in FIG. 5A, the second side wall 21 has a structure in which outer surface ribs 21L protrude from the outer surface of the side wall body 21S. Further, as shown in FIG. 5B, a pair of side protruding walls 40, 40 are bent at right angles from both ends in the longitudinal direction of the second side wall 21, and the side protruding walls 40 are first to third. Side engaging holes 41, 42, 43 are formed side by side. Further, slide engagement holes 46 are formed in the inner surface 21N of the second side wall 21 at positions adjacent to the first side engagement holes 41, respectively.

  As shown in FIG. 4, the first side wall 11 has a structure in which outer surface ribs 11L protrude from the outer surface of the side wall body 11S. In addition, a pair of side depressions 11K and 11K are formed on the outer surface of the first side wall 11 by depression of both sides, and the first to third side engagement protrusions 61, 62 and 63 are arranged in the vertical direction. When the folding container 10 is in the assembled state, as shown in FIG. 1, the side protruding wall 40 is accommodated in the side depressed portion 11 </ b> K, and the first to third side engaging holes 41, 42, 43 are inserted. The first to third side engaging protrusions 61, 62, 63 (see FIG. 4) engage with each other, and the first and second side walls 11, 21 are coupled.

  As shown in FIG. 4, a guide hole 65 is formed at the upper end of the first side wall 11 so as to penetrate the outer rib 11L in the left-right direction. A pair of slide engagement bars 67, 67 are arranged symmetrically and inserted through the guide hole 65. In addition, a cover 68 is attached to the center of the upper surface of the first side wall 11, and inside the cover 68, a slide disk 70 is accommodated on the slide engagement bars 67, 67 so as to be movable up and down. Yes. The slide board 70 is urged upward by a pair of elastic legs 72, 72 provided at the lower end. Further, a pair of cam projections 71, 71 formed to protrude from the slide disc 70 are engaged with cam grooves 69, 69 formed in the pair of slide engagement bars 67, 67. Normally, the tip ends of the pair of slide engagement bars 67, 67 protrude from both side surfaces of the first side wall 11, and when the slide plate 70 is pressed through the operation opening 11M on the upper surface of the first side wall 11, The pair of slide engagement bars 67 and 67 slide so as to retract into the guide hole 65 from both side surfaces of the first side wall 11.

  The above-described engagement mechanism 50 (see FIG. 4) includes the above-described pair of slide engagement bars 67 and 67, the slide disc 70, and the slide engagement hole 46 of the second side wall 21 described above. . When the folding container 10 is in the assembled state, the tip end portions of the slide engagement bars 67 and 67 engage with the slide engagement holes 46 and 46 to prevent the first side wall 11 from falling down. .

  Next, the detailed structure of the connection part of the 1st and 2nd side walls 11 and 21 and the bottom wall 30 is demonstrated below. As shown in FIG. 7, the bottom wall 30 includes a pair of first support protrusion walls 31, 31 protruding upward from a pair of short side outer edges and a pair of long side outer edges. A pair of second support projecting walls 32, 32 projecting upward is provided.

  Each first support protruding wall 31 is formed with hinge recesses 33 at both ends and the center in the longitudinal direction. As shown in an enlarged view in FIG. 8, these hinge recesses 33 include an upper surface opening 33 </ b> A opened on the upper surface of the first support protruding wall 31, and an inner side surface opening 33 </ b> B opened on the inner side surface of the first support protruding wall 31. have. The inner side surface opening 33B is narrower than the upper surface opening 33A and is located in the center of the upper surface opening 33A in the width direction. A pair of in-hole locking projections 34, 34 project in the wall thickness direction of the first support projection wall 31 from both side portions of the inside surface of the hinge recess 33 with the inner side opening 33 </ b> B interposed therebetween. ing. These in-hole locking projections 34 are formed from the upper end of the hinge recess 33 to the middle position in the vertical direction, and have a triangular shape with a vertex on the lower end side.

  As shown in FIG. 7, each of the second support protrusion walls 32 also has a plurality of (for example, four) hinge recesses 33 similar to those of the first side wall 11 symmetric to the longitudinal direction of each second support protrusion wall 32. It is arranged and provided. Then, at the center in the longitudinal direction of the second support projecting wall 32, a hinge recess 35 having a partly different shape from that of the other hinge recess 33 (hereinafter referred to as “self-supporting hinge recess 33” is distinguished from the other hinge recess 33. 35 ”). Specifically, as shown in FIG. 8, the inner surface opening 35B of the self-supporting hinge recess 35 is disposed close to one end portion in the width direction of the upper surface opening 35A, and the opening edge of one side portion of the inner surface opening 35B. A flat slidable contact surface 36 (corresponding to the “inner side surface of the hinge recess” in the present invention) that is flush with the second support protrusion wall 32 from the depth direction in the thickness direction is formed. Further, on the opposite side of the self-standing hinge recess 35 from the sliding contact flat surface 36 across the inner side surface opening 35 </ b> B, an in-hole locking projection 34 similar to the other hinge recess 33 is provided. Here, when the inner surface facing the inner surface opening 35B in the thickness direction of the second support projection wall 32 in the self-supporting hinge recess 35 is referred to as a main inner surface 35Z, the sliding inner surface 35Z is included in the sliding contact flat surface 36. A standing engagement groove 37 is formed along the side edge. The standing engagement groove 37 corresponds to the “standing standing concave and convex engaging portion” and the “standing standing concave and concave portion” of the present invention, and has a square groove shape extending over the entire vertical direction of the self-standing hinge concave portion 35. One inner side surface of the engaging groove 37 is flush with the main inner side surface 35Z.

  As shown in FIG. 4, a plurality of hinge arms 22 are provided on the lower surface of the first side wall 11 at a position facing the hinge recess 33 of the first support protruding wall 31. As shown in FIG. 5A, a plurality of hinge arms 22 are also provided on the lower surface of the second side wall 21 at a position facing the hinge recess 33 of the second support protruding wall 32. As shown in FIG. 6A, each hinge arm 22 of the second side wall 21 rotates a plurality of (for example, three) arm constituting projecting pieces 28 protruding from the lower surface of the second side wall 21. The arm main body 22H is configured to be opposed to each other in the axial direction and communicated by the connecting wall 27, and a pair of hinge shaft protrusions 23 and 23 protruding in opposite directions from both side surfaces of the tip end portion of the arm main body 22H. It becomes.

  As shown in FIG. 6B, the connecting wall 27 is flush with the inner surface 21N of the second side wall 21 and extends downward along the arm-constituting projection 28 group (see FIG. 6A). The arm-shaped projecting pieces 28 are bent along the lower surface. Here, assuming that the side of the arm main body 22H having the connecting wall 27 flush with the inner surface 21N of the second side wall 21 is called the rear side and the opposite side is called the front side, the hinge shaft protrusion 23 is shown in FIG. As shown in FIG. 5, the arm body 22 </ b> H is formed in a range extending from the front end position to the rear end position of the lower edge of the arm main body 22 </ b> H, and protrudes to the side, and is bent upward at the rear end position. As shown in FIG. 4, the hinge arm 22 provided on the first side wall 11 has the same structure as the hinge arm 22 on the second side wall 21.

  On the lower surface of the second side wall 21, a position facing the self-supporting hinge recess 35 is a hinge arm 29 having a partly different shape from the other hinge arm 22 (hereinafter referred to as “ A self-supporting hinge arm 29 "). As shown in FIG. 6A, the arm main body 29 </ b> H of the self-supporting hinge arm 29 includes an arm-constituting projecting piece group 28 and a communication wall 27, as with the normal hinge arm 22. Further, the arm constituting protrusions 28, 28 on both sides of the group of arm constituting protrusions 28 are provided with plate thickness portions 28A, 28A at the base end portion on the second side wall 21 side, and bulge outward, and each plate thickness. The lower end portion of the portion 28A is an inclined surface located in the middle in the up-down direction of each arm constituting protrusion 28.

  A hinge shaft protrusion 23 similar to the hinge arm 22 is provided at the lower end of one side surface of the self-supporting hinge arm 29, and the other side surface of the self-supporting hinge arm 29 (the “side surface of the hinge arm” of the present invention). A slidable contact protrusion 26 is provided in place of the hinge shaft protrusion 23 at the lower end portion (corresponding). Here, regarding the arm main body 29H of the self-supporting hinge arm 29, similarly to the other hinge arms 22, if the connecting wall 27 side is referred to as the rear and the opposite side is referred to as the front, It is arrange | positioned at the rear-end part in the lower edge part of 29H. Further, as shown in FIG. 9A, the sliding contact projection 26 has both protrusions from the arm main body 29H extremely smaller than the hinge shaft projection 23, and the tip of the sliding contact projection 26 is It is a flat surface parallel to the side surface of the arm body 29H.

  As shown in FIG. 6 (A), the arm-constituting projection 28 having the sliding contact projection 26 of the self-supporting hinge arm 29 has slits 22S and 22S formed at the upper end portion and the middle portion in the vertical direction. ing. The slit 22S at the upper end is formed so as to separate a part of the arm component protrusion 28 from the lower surface of the second side wall 21, and extends from the front end of the arm body 29H to a position near the rear end. Further, the slit 22S in the middle portion in the vertical direction is positioned below the plate thickness portion 28A and extends in parallel with the same length as the slit 22S in the upper end portion. As a result, a portion of the arm constituting protrusion 28 sandwiched between the slits 22S and 22S is cut into a cantilever shape, and the elastic piece 24 as the “elastic support portion” of the present invention is formed.

  From the front end of the elastic piece 24, a standing engagement protrusion 25 is formed so as to protrude laterally. Specifically, the standing engagement protrusion 25 corresponds to the “standing protrusion-engagement engaging portion” and the “standing engagement protrusion” of the present invention, and is disposed at the upper end of the distal end portion of the elastic piece 24. Further, the standing engagement protrusion 25 has a ridge line portion 25A extending in the vertical direction, and includes guide slopes 25B and 25B on the front side and the rear side of the ridge line portion 25A. The width of the standing engagement protrusion 25 is substantially the same as that of the above-described standing engagement groove 37.

  The description regarding the structure of the folding container 10 which concerns on this embodiment is above. Next, the effect of this folding container 10 is demonstrated. In order to change the folding container 10 from the assembled state (see FIG. 1) to the folded state (see FIG. 2), the slide disc 70 is pushed down and the slide engagement bars 67 and 67 are pulled out from the slide engagement holes 46 and 46, The first side wall 11 is brought down on the bottom wall 30. Next, the pair of second side walls 21, 21 are brought down and overlapped on the first side walls 11, 11. Thereby, the folding container 10 will be in a folding state.

  Here, in the folding container 10 of this embodiment, since the standing engagement protrusion 25 of the hinge arm 29 for self-supporting is arranged on the side surface of the arm main body 29H, it stands up like before when it is in the folded state. The engagement protrusion 25 does not protrude upward. Further, as shown in FIG. 2, the self-standing hinge arm 29 is positioned below the upper surface of the second support projecting wall 32 in the folded state, and the standing engagement projecting portion 25 is connected to the inner surface of the second support projecting wall 32. It arrange | positions between the lower surfaces of the 2nd side wall 21, and is protected (refer FIG. 10). As a result, there is no fear of a situation in which the standing engagement protrusion 25 is crushed by contact with another folding container and the engagement force is weakened as in the prior art.

  In order to change the folding container 10 from the folded state (see FIG. 2) to the assembled state (see FIG. 1), first, the pair of second side walls 21, 21 are raised before the first side walls 11, 11. At this time, the second side wall 21 rotates around an imaginary rotation shaft in the vicinity of the hinge shaft protrusion 23 so that the hinge shaft protrusion 23 sinks below the in-hole engagement protrusion 34 and is locked to its lower surface. (See FIG. 9B). Further, the lower surface of the second side wall 21 is placed on the upper surface of the first support protruding wall 31 so that the second side wall 21 stands up from the first support protruding wall 31. When the first support protrusion wall 31 is in the standing posture, the standing engagement protrusion 25 of the self-standing hinge arm 29 is engaged with the standing engagement groove 37 of the self-standing hinge recess 35 as shown in FIG. To do. Specifically, as shown in FIG. 10, the guide inclined surface 25 </ b> B (see FIG. 6A) of the standing engagement protrusion 25 is formed on the self-standing hinge recess 35 in the middle of raising the second side wall 21 from the tilted posture. The standing engagement protrusion 25 slidably contacts the opening edge and rides on the slidable contact flat surface 36 (see FIG. 8), so that the elastic piece 24 is deformed. Further, when the second side wall 21 is raised, the ridge line portion 25A of the standing engagement protrusion 25 is slidably contacted on the sliding contact flat surface 36, and the second side wall 21 is just in the standing posture. By the elastic restoration, the standing engagement protrusion 25 engages with the standing engagement groove 37 in a concave-convex manner (see FIG. 11), and the second side wall 21 is held in a standing posture to stand on its own, or the second side wall 21 stands on its own. It is assisted by the concavo-convex engagement between the engagement protrusion 25 and the standing engagement groove 37.

  Next, the first side walls 11 and 11 are raised up by releasing the hands from the second side walls 21 and 21 that are self-supporting. Here, in the present embodiment, the standing engagement protrusion 25 and the standing engagement groove 37 are formed on the side surface of the hinge arm 29 and the inner side surface of the hinge recess 35 that face each other in the rotation axis direction of the hinge arms 22 and 29. The distance from the pivot center of the hinge arms 22 and 29 to the standing engagement projection 25 compared to the conventional one having a portion corresponding to the standing engagement projection 25 on the bottom surface of the hinge recess 33 because it is arranged. Thus, the engagement force between the standing engagement protrusion 25 and the standing engagement groove 37 can be increased. In addition, since the deformation direction of the elastic piece 24 that supports the standing engagement protrusion 25 is oriented in a direction orthogonal to the rotation direction of the second side wall 21, the portion corresponding to the elastic piece 24 is the second side wall 21. An engagement force higher than that of the conventional one that is deformed in the same direction as the rotation direction can be obtained. Thereby, the self-supporting of the second side wall 21 is stabilized, and the situation where the second side walls 21 and 21 interfere with the first side wall 11 during the standing operation of the first side wall 11 is prevented, and the working efficiency is improved. Then, the folding container 10 is in an assembled state with the first side walls 11 and 11 in an upright posture.

  As described above, in the folding container 10 of the present embodiment, when the folded state is changed to the assembled state, the self-standing of the second side wall 21 that is raised first is more stable than before. In addition, since the self-supporting hinge arm 29 and the self-supporting hinge recess 35 have a structure in which only one end of the normal hinge arm and the hinge recess is changed, the design is easy. Moreover, the self-supporting hinge arm 29 also has a hinge shaft projection 23 and is pivotally supported by the hinge recess 33 in the same manner as the normal hinge arm 22, so that the rotation operation is stable, and as a result stands upright. The engagement and disengagement operations between the concave and convex engaging portions are also stabilized. Further, the side surface of the self-supporting hinge arm 29 that does not have the hinge shaft protrusion 23 is provided with the sliding contact protrusion 26 that protrudes from the entire side surface, so that the frictional resistance during rotation of the second side wall 21 is provided. Is reduced by the slidable contact projection 26 and the play of the second side wall 21 in the direction of the rotation axis can be suppressed.

  Further, since the standing engagement groove 37 extends in the vertical direction and the upper end portion is open to the upper surface of the second support projecting wall 32 (see FIG. 11), the bottom wall 30 is formed by a resin mold. The structure of the part of the mold where the standing engagement groove 37 is formed is simplified, and the mold production cost can be reduced.

  Furthermore, since the self-supporting hinge arm 29 is arranged at the center of the second side wall 21, the distance from the self-supporting hinge arm 29 to the other farthest hinge arm 22 is larger than when the self-supporting hinge arm 29 is arranged at a position other than the center. Get smaller. Thereby, the dispersion | variation in the mutual engagement depth of the standing engagement protrusion 25 and the standing engagement groove 37 resulting from the dispersion | variation in the dimension of the 2nd side wall 21 and the bottom wall 30 can be suppressed.

[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 above-described embodiment, the plate thickness portion 28A is provided at the base end portion of the arm body 29H of the self-supporting hinge arm 29, but the self-supporting hinge shown in FIGS. 12 (A) and 12 (B). Unlike the arm 29V, the plate thickness portion 28A may not be provided, and the side surface of the arm main body 29H may be provided.

(2) In the above-described embodiment, the standing engagement protrusion (standing engagement protrusion 25) of the present invention is formed on the self-standing hinge arm 29 side, while the standing engagement recess (standing) is formed on the inner surface of the self-standing hinge recess 35. The engagement groove 37) is formed, but conversely, the engagement engagement recess may be formed on the self-standing hinge arm side, while the standing engagement protrusion may be formed in the self-supporting hinge recess.

(3) In the above-described embodiment, one self-supporting hinge arm 29 is provided for each of the second side walls 21, but a plurality of self-supporting hinge arms may be provided on each second side wall.

DESCRIPTION OF SYMBOLS 10 Folding container 11 1st side wall 21 2nd side wall 22, 29, 29V Hinge arm 22H, 29H Arm main body 23 Hinge axial protrusion 24 Elastic piece 25 Standing engagement protrusion 26 Sliding contact protrusion 27 Connecting wall 28 Arm structure protrusion Piece 30 Bottom wall 31 1st support protrusion wall 32 2nd support protrusion wall 32, 32 2nd support protrusion wall 33, 35 Hinge recessed part 33A, 35A Top surface opening 33B, 35B Inner side surface opening 34 In-hole engagement protrusion 36 Sliding contact Flat surface 37 Standing engagement groove

Claims (4)

A rectangular bottom wall, a pair of first side walls disposed on a pair of opposing sides of the outer edge of the bottom wall, and a pair of second side walls disposed on the remaining pair of opposing sides. Prepare as a separate part,
A supporting projection wall protrudes upward from the entire outer edge of the bottom wall, and lower ends of a plurality of hinge arms suspended from the first and second side walls open to the upper surface and the inner side surface of the supporting projection wall. A plurality of hinge recesses are pivotally connected to each other and are folded in a state of being overlapped on the bottom wall in the order of the first and second side walls, while standing in the order of the second and first side walls. And the pair of first side walls are sandwiched between the pair of second side walls to prevent the second side walls from falling down, and the side portions of the first side walls and the second side walls In the folding container in which the first sidewall is prevented from falling down by the engagement mechanism between the inner surface of the sidewall and held in the assembled state,
And the side surface of at least one of the hinge arm of the second side wall, on the inner surface of the or the hinge recess facing in the direction of the rotation axis of the hinge arm with respect to the side surface thereof the hinge arm, the second sidewall Providing a pair of raised and recessed engaging portions for holding the second side wall in an upright posture by engaging with each other from the direction of the pivot axis of the hinge arm when standing up;
The pivot axis direction of the hinge arm when one of the side surface of the hinge arm and the inner side surface of the hinge recess supports one of the raised and recessed engaging portions and the second side wall is folded. A folding container comprising an elastic support portion that is elastically deformed to allow disengagement of the pair of raised concavo-convex engagement portions. Each of the hinge arms that do not have the raised and recessed engaging portions has a plurality of arm-constituting projections suspended from the first or second side wall arranged opposite to each other in the direction of the pivot axis of the hinge arm. And a pair of hinge shaft protrusions protruding in opposite directions from both side surfaces of the distal end of the arm body,
Each of the hinge recesses that do not have the standing uneven engagement portion has a shape in which an inner surface opening that is opened on the inner surface of the support projecting wall is narrower than the upper surface opening and is arranged at the center of the upper surface opening, and A pair of in-hole locking protrusions project in the thickness direction of the support protruding wall from both side portions of the inner surface of the hinge recess sandwiching the inner side surface opening, and the pair of in-hole locking By locking the pair of hinge shaft protrusions on the lower surface of the protrusion, the lower end of the hinge arm is rotatably connected to the lower end of the hinge recess,
The hinge recess having the raised and recessed engaging portion is arranged such that the inner side surface opening is brought close to one end portion in the width direction of the upper surface opening, and the support protrusion protrudes from an opening edge of one side portion of the inner side surface opening. One of the above-mentioned standing projections and depressions has a sliding contact flat surface which is flush with the depth direction or depth position in the thickness direction of the wall, and a part of the sliding contact flat surface is depressed. Provided as a joint part, further comprising a structure provided with the in-hole locking protrusion on the opposite side of the sliding contact flat surface across the inner side opening,
The hinge arm having the raised and recessed engaging portion includes the hinge shaft protrusion only on one side surface of the arm main body, and a part of the arm constituting protrusion on the other side surface of the arm main body. It is provided with an elastic piece as the elastic support part by cutting it into a cantilever shape, and further, an upright engaging projection that protrudes from the tip of the elastic piece and engages with the upright engaging recess can be engaged with the upright engaging protrusion. The folding container according to claim 1, wherein the folding container is provided as an engaging portion.   3. The folding container according to claim 2, wherein the standing engagement concave portion has a groove shape extending in a vertical direction and having an upper end opened to an upper surface of the support protruding wall.   Each of the second side walls is provided with at least three or more hinge arms, and only the hinge arm located at the center of the plurality of hinge arms is provided with the raised uneven engagement portion. The folding container according to any one of claims 1 to 3.

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