JP4996286B2 - Folding box made of synthetic resin - Google Patents

Description

  The present invention relates to a synthetic resin folding box that can be folded or assembled into a box shape in the same manner as a cardboard folding box.

  Conventionally, Patent Document 1 discloses a bottom lock type cardboard box as a folding box made of cardboard. This is a rectangular shape in plan view in a state in which adjacent side end portions of four side plates opposed to the front, rear, left and right are connected to each other via a fold line so as to be folded into a box shape. A rectangular tubular side wall constituting part that can be folded flatly by being folded into a substantially parallelogram shape so that the corners of the diagonal part of the other part become acute and the corners of the other pair of diagonal parts become obtuse, A bottom plate component part consisting of four bottom pieces that are foldably extended from each lower side of each of the four side plates via a fold line so as to overlap the inner surface of each side plate, and a fold line from each upper side of each of the four side plates A pair of diagonal parts that are folded so as to have an acute angle when folded into the substantially parallelogram shape. On both sides of the corner The overlapping piece is attached to one side portion of the bottom piece that is continuous from one side plate of the two side plates via an inclined folding line that is inclined at an acute angle with respect to the lower side of the both side plates in a plan view in a state assembled in a box shape. The overlapping piece is overlapped and fixed with an adhesive or a stopper in a state where it overlaps with the bottom piece that is extended from the lower side of the other adjacent side plate through the bottom piece connecting hinge part, and has a substantially parallelogram shape. The two bottom pieces adjacent to each other at the corners of the pair of diagonal portions that are folded so as to have an obtuse angle when folded are in a free state with no connection. In the corrugated cardboard box, the folding line is obtained by folding the corrugated cardboard for constituting the corrugated cardboard box into a mountain or a valley.

  This bottom lock type corrugated cardboard box is overlapped and fixed with adhesives and stoppers in the state where the overlapping piece overlaps the adjacent bottom piece when assembled from the folded state to the box shape, so the inner surface side of each side plate in the folded state Each of the bottom pieces folded and stored so as to overlap with each other is automatically rotated so that the bottom piece connection hinge part gradually falls with respect to the inner surface of each side plate so that the four side plates are rectangular or square in plan view. When assembled in such a manner, each bottom piece falls at a right angle with respect to each side plate to automatically form the bottom of the box. In a state assembled in this box shape, the stored items are stored in a cardboard box, and the four lid pieces are brought down and closed. In this case, after the pair of opposing short-side lid pieces are first tilted, the pair of opposing long-side lid pieces are collapsed and placed on the short-side lid piece that has been tilted first. In the state, the upper opening of the cardboard box is closed.

  In addition, when the rectangular tubular side wall structure composed of the four side plates is folded so as to be a substantially parallelogram from the state of being assembled into a box shape, the adhesive or stopper is used in a state where the overlapping piece overlaps the adjacent bottom piece. Since it is overlapped and fixed by the tool, it automatically rotates so that each bottom piece rises around the bottom piece connecting hinge part so that each bottom piece approaches the inner surface side of each side plate. It is folded flat so as to overlap the inner surface.

  In this folded state, two bottom pieces overlap each other between the two side plates, resulting in an overlap margin. Here, it is not possible to absorb the overlap margin by simply bending at the fold line portion connecting the side edges of the two side plates that overlap each other through the two bottom pieces, but in the conventional example, the material is cardboard The cardboard is crushed and deformed at the fold line portion connecting the side edges of the two side plates according to the characteristics, so that the overlap is absorbed.

  However, the cardboard box of the above-mentioned conventional example is weak and easily torn, and it is easily soiled, and when it is soiled, it is difficult to remove the dirt and cannot be washed. For these reasons, the cardboard box is used only once in a normal use form. This is not preferable from the viewpoint of resource saving. Even if the cardboard box is reused, the strength is weak as described above, it is easy to get dirty, and once it gets dirty, it is hard to remove and cannot be cleaned, so it can be reused only 3-5 times at most.

  For this reason, Patent Document 2 proposes to use synthetic resin instead of corrugated cardboard to solve the drawbacks of the corrugated cardboard folding box configured as described above.

  By the way, when the folding box is made of synthetic resin, the folding line portion connecting the side edges of the two side plates is crushed and deformed like a cardboard product, so that two sheets are folded between the two side plates in the folded state. It is not possible to absorb the overlap allowance that is overlapped by the bottom piece of. For this reason, in the conventional example shown in Patent Document 2, as shown in FIG. 15, the thin side plate coupling in which the side end portions of the four side plates 1 facing each other in the front, rear, left, and right sides are V-shaped. When the bottom piece 4 is connected to the hinge part 2 through the thin bottom piece connecting hinge part 5 having a V shape from the lower side of each side plate 1 and further folded into a substantially parallelogram shape. Four side plates 1 are folded into a substantially parallelogram at the end of one side plate 1a of the two side plates 1a and 1b on both sides of the corner of the pair of diagonal portions that are folded so as to have an acute angle. In addition, the overlapping margin absorbing protrusions 8 corresponding to the overlapping thickness are provided in a folded state in which the bottom pieces 4 are overlapped with the inner surfaces of the side plates 1.

  However, when each bottom piece 4 is folded so as to be along the inner surface of each side plate 1, the protruding length from the inner surface of the side plate 1 of the overlapping allowance absorbing projection 8 is folded and the plurality of bottom pieces 4 partially overlap. Since the protruding length is the same as the overlapping thickness of the portions, a gap S is generated in a portion other than the portion where the plurality of bottom pieces 4 between the side plates 1 facing each other in a flat folded state are partially overlapped. In a portion where the bottom piece 4 on the inner surface of 1 does not overlap, a gap S corresponding to the protruding length of the overlap allowance absorbing protrusion 8 is generated between the side plates 1. Therefore, when folding boxes that are folded flat are stacked up and down in multiple stages, the side plate 1 bends downward due to the load from above at the location where the gap S between the side plates 1 is generated. There is a risk of cargo collapse.

  In addition, when the protruding length from the inner surface of the side plate 1 of the overlap allowance absorbing protrusion 8 is slightly longer than the protruding length that is the same as the overlapping thickness of the portion where the plurality of bottom pieces 4 partially overlap in the folded state, it is folded flat. Even in the portion where the plurality of bottom pieces 4 between the side plates 1 facing each other partially overlap, a gap is generated between the side plate 1 and the bottom piece 4, and the side plate 1 bends downward due to a load from above. There is a risk of cargo collapse.

  In particular, the hinge part of the corner that is folded so that it becomes obtuse when folded into a substantially parallelogram shape is most likely to bend downward, and when it is stacked in multiple stages up and down in the folded state, it tends to collapse There is.

Furthermore, in any of the above-mentioned bottom lock type cardboard or synthetic resin folding boxes, when an external force is applied to the side plates in the state of being assembled into a box shape in the form of a plane rectangle, the adjacent side plates form each other. There was a problem that the angle could not be maintained at right angles, and the box shape was deformed.
JP-A-8-169436 JP-A-8-282648

  The present invention was invented in view of the above-described conventional problems, and is made of a synthetic resin, so that the strength is strong, the dirt is easily removed, it can be washed, and can be reused any number of times. Even if it is made of resin, it can be folded flat like a cardboard folding box, and even if it is folded flat and stacked in multiple stages up and down, there is a gap between the side plates facing up and down The side plate can be reliably prevented from bending downward due to the load from above, the load can be prevented from collapsing with a simple configuration, and the box shape can be maintained in a state assembled in a box shape. It is an object of the present invention to provide a synthetic resin folding box that is strong, easy to clean, can be cleaned, and can be reused any number of times.

In order to solve the above-mentioned problems, the synthetic resin folding box according to the present invention has the side plate connecting hinges 2 foldably connect adjacent side end portions of the four side plates 1 facing front, rear, left and right respectively. In a state of being assembled into a box shape, it is rectangular or square in plan view, and when folded, the corners of a pair of diagonal parts become acute angles and the corners of the other pair of diagonal parts become obtuse angles so that they are obtuse angles. The bottom piece 4 is foldably extended from the lower side of each of the four side plates 1 via the bottom piece connecting hinges 5 and is foldable. A bottom plate configuration in which each bottom piece 4 is folded so as to overlap the inner surface of each side plate 1 in a state and the bottom pieces overlap each other to form a box-shaped bottom in a state in which the rectangular tubular side wall constituting portion 3 is assembled in a box shape. Part 6 and In the synthetic resin folding box 7 provided, one of the two side plates 1 on both sides of the corners of a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. In the folded state in which the four side plates 1 are flatly folded at the end of the side plate 1 and each bottom piece is overlapped with the inner surface of each side plate 1, the overlap allowance absorbing protrusion 8 corresponding to the overlap thickness is projected, Side plate coupling hinges of at least one side plate 1 of side plates 1 adjacent to each other through side plate coupling hinges 2 at the corners of a pair of diagonal portions that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape. In the vicinity of the portion 2, a spacing holding projection 13 for holding the spacing between the side plates 1 facing each other in the folded state of the folding box 7 is projected from the side plate 1, and the spacing holding projection 13 is assembled in a box shape. Side plate connecting hub Are those which form an angle of the side plate 1 adjacent to each other via the di-2 is held so as not smaller than 90 °, spacing holding the side plates 1 one of the side plates 1 adjacent through side plate connecting hinge part 2 In addition to projecting the projecting portion 13, a fitting recess 40 into which the spacing holding projecting portion 13 is fitted in the state of being assembled in a box shape on the inner surface portion of the other side plate 1 is provided. .

  Thus, since it is the synthetic resin folding box 7, it is stronger than the corrugated cardboard folding box 7, is easy to remove dirt, can be washed, can be reused any number of times, and is made of synthetic resin. Despite being the folding box 7, one side plate 1 of the two side plates 1 on both sides of the corners of a pair of diagonal portions that are folded so as to have an acute angle when folded into a substantially parallelogram shape. Since the four side plates 1 are flatly folded at the end of each of the two side plates 1 and the bottom pieces overlap each other on the inner surface of each side plate 1, the overlap margin absorbing projections 8 corresponding to the overlap thickness are projected. The overlapping of the bottom pieces 4 folded so as to be interposed between the opposing side plates 1 when the folding pieces 7 made of synthetic resin are folded so that the bottom pieces 4 overlap the inner surfaces of the side plates 1 by the overlapping margin absorbing projections 8. It is possible to absorb the cost and make sure the synthetic resin The folding box 7 can be folded, and when each bottom piece 4 is folded so as to be along the inner surface of each side plate 1, a gap is formed between the opposing side plates 1 in a flat folded state, and the side plate is formed in this portion. 1 is bent, but in the present invention, as described above, the interval holding projection 13 is provided protruding from the side plate 1 for holding the interval between the side plates 1 facing each other in the folded state of the folding box 7. Therefore, it is possible to prevent the side plate 1 from being bent in the vicinity of the side plate connecting hinge portion 2 at the corner portion which becomes obtuse in the folded state, and is stable so that no load collapse occurs even when stacked in a multi-stage vertically in the folded state. Furthermore, in addition to this, the angle formed by the side plates 1 adjacent to each other via the side plate connecting hinge portion 2 by the spacing holding projection 13 in a state assembled in a box shape is smaller than 90 °. So that the corners of the pair of diagonal parts that are folded so as to have an obtuse angle when folded are not smaller than 90 ° when assembled in a box shape. 13, the corners can be held at a right angle, and the box shape can be maintained even if an external force is applied to the side plate 1.

In addition, since the interval holding projection 13 is fitted into the recessed portion 40 in the state of being assembled into a box shape, the interval holding projection 13 jumps out of the box shape and obstructs when the stored items are taken in and out. There is no such thing as. Further, by fitting the spacing holding projections 13 into the fitting recesses 40, the adjacent side plates 1 can be held at right angles with a more accurate positional relationship in a state assembled in a box shape.

In addition, another synthetic resin folding box according to the present invention has a box shape in which the side edge portions of the four side plates 1 facing each other in the front, rear, left, and right directions are connected to each other by the side plate connecting hinge portion 2 so as to be freely foldable. When assembled, it is rectangular or square in plan view, and when folded, it is folded into a substantially parallelogram shape so that the corners of a pair of diagonal parts are acute and the corners of the other pair of diagonal parts are obtuse. The bottom piece 4 is foldably extended from the lower side of each of the four side plates 1 via the bottom piece connecting hinges 5 and can be folded in a flat state. A bottom plate component 6 that is folded so that the bottom piece 4 overlaps the inner surface of each side plate 1 and the bottom pieces overlap with each other to form a box-shaped bottom in a state where the rectangular tubular side wall component 3 is assembled in a box shape; Synthetic tree with The end of one side plate 1 of two side plates 1 on both sides of a corner of a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape in the made folding box 7 In the folded state in which the four side plates 1 are folded flat and each bottom piece overlaps the inner surface of each side plate 1, the overlap allowance absorbing protrusion 8 corresponding to the overlap thickness is projected and formed in the substantially parallelogram shape. At the corners of a pair of diagonal portions that are folded so as to have an obtuse angle when folded into a side plate, the side plate connecting hinge portion 2 is adjacent to the side plate connecting hinge portion 2 of at least one of the side plates 1 adjacent thereto. In the folded state of the folding box 7, the spacing holding projection 13 for projecting the spacing between the side plates 1 facing each other is projected from the side plate 1, and the spacing holding projection 13 is assembled in a box shape. Via side plate connecting hinge 2 Angle between adjacent side plates 1 each other is intended to hold the not less than 90 °, folding box folding interval retaining projection 13 in a state of opposing side plates 1 of the inner surface portion spacing the holding projection 13 on the A tip fitting portion 41 into which the protruding tip portion is fitted is provided .

Thus, since it is the synthetic resin folding box 7, it is stronger than the corrugated cardboard folding box 7, is easy to remove dirt, can be washed, can be reused any number of times, and is made of synthetic resin. Despite being the folding box 7, one side plate 1 of the two side plates 1 on both sides of the corners of a pair of diagonal portions that are folded so as to have an acute angle when folded into a substantially parallelogram shape. Since the four side plates 1 are flatly folded at the end of each of the two side plates 1 and the bottom pieces overlap each other on the inner surface of each side plate 1, the overlap margin absorbing projections 8 corresponding to the overlap thickness are projected. The overlapping of the bottom pieces 4 folded so as to be interposed between the opposing side plates 1 when the folding pieces 7 made of synthetic resin are folded so that the bottom pieces 4 overlap the inner surfaces of the side plates 1 by the overlapping margin absorbing projections 8. It is possible to absorb the cost and make sure the synthetic resin The folding box 7 can be folded, and when each bottom piece 4 is folded so as to be along the inner surface of each side plate 1, a gap is formed between the opposing side plates 1 in a flat folded state, and the side plate is formed in this portion. 1 is bent, but in the present invention, as described above, the interval holding projection 13 is provided protruding from the side plate 1 for holding the interval between the side plates 1 facing each other in the folded state of the folding box 7. Therefore, it is possible to prevent the side plate 1 from being bent in the vicinity of the side plate connecting hinge portion 2 at the corner portion which becomes obtuse in the folded state, and is stable so that no load collapse occurs even when stacked in a multi-stage vertically in the folded state. Furthermore, in addition to this, the angle formed by the side plates 1 adjacent to each other via the side plate connecting hinge portion 2 by the spacing holding projection 13 in a state assembled in a box shape is smaller than 90 °. So that the corners of the pair of diagonal parts that are folded so as to have an obtuse angle when folded are not smaller than 90 ° when assembled in a box shape. 13, the corners can be held at a right angle, and the box shape can be maintained even if an external force is applied to the side plate 1. In addition, in the folded state, the protruding tip portion of the spacing holding projection 13 is fitted into the tip fitting portion 41 and prevents the protruding tip portion of the spacing holding projection 13 from sliding against the inner surface of the opposing side plate 1. Thus, in the folded state, it is possible to prevent the side plate 1 from being bent by the spacing holding projection 13 in a state where the opposing side plates maintain an accurate positional relationship.

  Since the present invention is a folding box made of synthetic resin, it is strong, easy to remove dirt, can be washed, can be reused any number of times, and is a folding box made of synthetic resin. Since the projection for absorption is provided, it can be folded flat so that the bottom piece overlaps the inside of the side plate like the bottom lock type cardboard folding box, and it is folded flat like this Even when stacked in multiple stages up and down in the state, even when the bottom piece between the side plates facing up and down does not overlap and a gap is generated, the side plate can be reliably prevented from bending downward due to the load from above, It is possible to prevent the load from collapsing with a simple configuration, and it is possible to keep the box shape so as not to be deformed in the assembled state.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  As shown in FIGS. 1 to 6, the folding box 7 made of a synthetic resin of the present invention comprises at least a square tubular side wall constituting portion 3 made of a synthetic resin and a bottom plate constituting portion 6 made of a synthetic resin.

  The square tubular side wall constituting portion 3 is configured by connecting adjacent side end portions of the four side plates 1 facing front, rear, left and right so as to be foldable by a side plate connecting hinge portion 2. The component 3 is rectangular or square in plan view when assembled in a box shape, and when folded, as shown in FIG. 10, the corners of a pair of diagonal portions are acute and the corners of the other pair of diagonal portions. After being folded into a substantially parallelogram shape so that the part has an obtuse angle, it can be folded flat as shown in FIGS. In the embodiment shown in the accompanying drawings, an example of a rectangular shape in plan view when assembled in a box shape is shown, but a square shape in plan view in a state assembled in a box shape may be used.

  Further, as shown in FIGS. 4 and 7, the bottom piece 4 is integrally extended from the lower sides of the four front and rear side plates 1 through the bottom piece connecting hinge portion 5, and the bottom plate 4 is formed by the four bottom pieces 4. A configuration unit 6 is configured. Each bottom piece 4 is rotated at the bottom piece connecting hinge part 5 so as to approach the inner surface side of the side plate 1 when the rectangular tubular side wall constituting part 3 is folded into a substantially parallelogram shape. 3, the side plate 1 is folded so as to overlap the inner surface.

  The rectangular tubular side wall constituting part 3 can be folded flatly after being folded into a substantially parallelogram shape from a state of being assembled into a rectangular shape or a square shape (that is, in a rectangular tubular shape) in plan view as described above. In this case, as shown in FIG. 10, the two side plates 1 (1a, 1b) on both sides of the corners of the pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape described above. One side plate 1a is integrated with the side plate 1a at right angles to the side plate 1a as shown in FIGS. 1 to 3 on the inner surface side of the end portion (the end portion on the corner side that is folded so as to have an acute angle). In addition, a projecting piece that becomes the overlapping margin absorbing projection 8 is erected along the height direction of the side plate 1.

  The overlapping margin absorbing protrusion 8 is set to a length corresponding to the overlapping thickness in a folded state in which the four side plates 1 are folded into a substantially parallelogram and each bottom piece 4 overlaps the inner surface of each side plate 1. It is.

  Further, as will be described later, a corner portion formed by the upper end portion of the side plate 1a and the upper end portion of the overlapping margin absorbing projection 8 is integrally connected by a corner connecting portion 30, and the upper surface of the corner connecting portion 30 is described later. It is a support part for mounting a part of the lid piece 15 with the lid piece 15 closed. The corner connecting portion 30 has a substantially right triangle shape in plan view and extends to the tip of the overlapping margin absorbing projection 8.

  At least one of the side plates 1 adjacent to each other through the side plate connecting hinge portion 2 at the corners of the pair of diagonal portions that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape (in the accompanying drawings). In the embodiment, the spacing holding projection 13 protrudes at the end of the inner side of the side plate 1b) on the side plate connecting hinge portion 2 side and at the position where the bottom piece 4 does not exist between the side plates 1 facing each other in the folded state of the folding box 7. It is.

The spacing holding projection 13 projecting from the side edge of the inner surface of the side plate 1 (in the embodiment, the side plate 1b) is along the longitudinal direction (vertical direction) of the side plate connecting hinge portion 2 and to the inner surface of the side plate 1. It has a shape of a right-angled protrusion .

  Further, the side plate coupling hinges on the inner surface of one of the side plates 1 adjacent to each other through the side plate coupling hinges 2 at the corners of a pair of diagonal portions that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape. An interval holding projection 13 is provided at the end of the portion 2 side, but the end of the inner surface of the other side plate 1 (the side plate 1a in the embodiment shown in the accompanying drawings) on the side plate connecting hinge portion 2 side. As shown in FIG. 2 (b), a fitting recess 40 into which the spacing holding projection 13 is fitted in the state of being assembled in a box shape is provided.

  Further, a tip fitting portion 41 into which the protruding tip portion of the spacing holding projection 13 is fitted into the inner surface portion of another side plate 1 facing the protruding tip portion of the spacing holding projection 13 in the folded state of the folding box. Is provided. The tip fitting portion 41 is configured by forming a fitting interval between the paired ribs 41a in the embodiment of FIGS.

  Moreover, the to-be-stopped part 36 is provided in the upper end part of the side plate 1b.

  One side plate 1 of two side plates 1a and 1b on both sides of a corner of a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape (the long side in the attached drawings) One side portion of the bottom piece 4 (hereinafter referred to as the bottom piece 4a) continuously extending from the side plate 1a) has an acute angle (implemented) with respect to the lower sides of the both side plates 1a and 1b in a plan view when assembled in a box shape. The overlapping piece 11 protrudes through an inclined hinge portion 9 inclined at 45 ° in the form.

  Then, as shown in FIG. 11, the overlapping piece 11 is slidably coupled to the bottom piece 4 (hereinafter referred to as the bottom piece 4b) that is led out from the lower side of the other adjacent side plate 1b through the bottom piece connecting hinge portion 5 in an overlapping state. It is slidably coupled by means 17.

  Further, the two bottom pieces 4 adjacent to each other at the corners of the pair of diagonal parts that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape are not connected to each other and are in a free relationship with each other. Yes.

  Further, a lid piece 15 is continuously foldably connected to the upper side of the one or more side plates 1 via a lid piece connecting hinge portion 10.

In the embodiment shown in the accompanying drawings, the upper ends of the pair of side plates 1a (in the figure, the side plates 1a on the long side) on which the overlap allowance absorbing projections 8 are provided, out of the two pairs of opposing side plates 1 of the four side plates 1 A pair of lid pieces 15a having the same length as that of the upper end edge are continuously foldably connected to the edges via the lid piece connecting hinge portion 10, and the other pair of members not projecting the overlap allowance absorbing projection portion 8 are provided. A lid piece 15b having a length equal to the length of the upper edge is extended to the upper edge of the side plate 1b via the lid piece connecting hinge 10 so as to be foldable.

  One half of the leading edge of the pair of lid pieces 15a is provided with a mounting concave portion 32 whose upper surface is paragraphed, and the other half of the leading edge is provided with a loading projection piece 33 whose lower face is paragraphed, The mounting recess 32 provided on one lid piece 15a faces the mounting projection 33 provided on the other lid piece 15a, and the mounting projection 33 provided on one lid piece 15a is the other. The lid pieces 15a are positioned so as to face the mounting recesses 32a. When the pair of lid pieces 15a are tilted sideways and the upper opening is closed, the opposed lid pieces 15 are placed on each other. The mounting projection piece 33 overlaps the mounting recess 32. A band 34 made of a soft synthetic resin is integrally projected from one side of the pair of lid pieces 15a, and a stopper 35 made of a hard synthetic resin is integrally formed at the tip of the band 34. It is configured.

  In the embodiment shown in the accompanying drawings, the synthetic resin folding box 7 having the above-described configuration is formed by combining and combining two half-body boxes 12 as shown in FIGS. 13 and 14 formed by integral molding of synthetic resin. It is.

  As shown in the developed views of FIGS. 13 and 14, the box half body 12 connects the side ends of a pair of adjacent side plates 1 a and 1 b with side plate connecting hinges 2 (hereinafter referred to as side plate connecting hinges 2 a). The overlapping margin absorbing protrusion 8 is projected along the side end of the side plate 1a toward the inner surface at the side end of the one side plate 1a not connected by the side plate connecting hinge portion 2a. The corner portion formed by the upper end of the absorbing projection 8 and the upper end of the side plate 1a is integrally connected by the corner connecting portion 30, and further, on the side end of the other side plate 1b that is not connected by the side plate connecting hinge portion 2a. Another side plate connecting hinge part 2 (hereinafter referred to as side plate connecting hinge part 2b) is provided, and a connecting part 18 is provided at the tip of the side plate connecting hinge part 2b, and as shown in FIG. The end on the side plate connecting hinge 2a side of the upper end of the inner surface of the other side plate 1b Projecting the distance holding projections 13, recesses 40 fitting on the end of the side plate connecting hinge part 2a of the upper end portion of the inner surface of the side plate 1a is are recessed.

  Further, the bottom pieces 4a and 4b are continuously led out from the lower sides of the pair of adjacent side plates 1a and 1b through the bottom piece connecting hinges 5, respectively, and the other adjacent one of the bottom pieces 4a and 4b. Overlapping pieces 11 are continuously provided via an inclined hinge portion 9 that is inclined at an acute angle (45 ° in the embodiment) with respect to the bottom piece connecting hinge portion 5 that continues to the bottom piece 4a at the side end opposite to the bottom piece 4b. It is composed of that. In the accompanying drawings, a lid piece 15 is continuously provided on the upper side of the side plate 1 via a lid piece connecting hinge portion 10. The box half body 12 having the above configuration is integrally formed by two-color injection molding of synthetic resin. The side plate 1, the bottom piece 4, the overlapping piece 11, the lid piece 15, the overlapping margin absorbing protrusion 8, and the corner connecting portion 30. The protrusion 13 for holding the gap and the stopper 35 are hard resins such as PP (polypropylene), PE (polyethylene), HDPE (high density polyethylene), PC (polycarbonate), PVC (vinyl chloride resin), ABS resin, and the like. Further, the side plate 1 and the side plate 1, the side plate 1 and the bottom piece 4, the bottom piece 4 and the overlapping piece 11, and the side plate 1 and the lid piece 15 are the side plate connecting hinge portions 2a and 2b, the bottom piece connecting hinge portion 5, respectively. Although it is connected integrally by the inclination hinge part 9 and the lid piece connection hinge part 10 so that folding is possible, these side plate connection hinge parts 2a and 2b, the bottom piece connection hinge part 5, the inclination hinge part 9, and the lid piece connection hinge part 10 Some or all, the strip 34 e.g., TPE (elastomer), LDPE (low density polyethylene), are molded by a soft resin such as EVA (ethylene-vinyl acetate).

Using the two box halves 12 integrally molded of synthetic resin as described above, the other box half 12 is provided on the overlapping margin absorbing protrusion 8 provided at the side end of one side plate 1a of the one box half 12. A connecting portion 18 provided at the tip of another side plate connecting hinge portion 2b provided at the side end of the other side plate 1b of the body 12 is overlapped and connected by the connecting means 16, and similarly the other box half body 12 is overlapped. A connecting portion 18 provided at the tip of the side plate connecting hinge portion 2b of one box half 12 is overlapped and connected to the energy absorbing projection 8. As a result, the two side plate connecting hinge portions 2a are positioned at a pair of diagonal portions and the other two side plate connecting hinge portions 2b are positioned at the other pair of diagonal portions. The side wall connecting hinge part 2b is formed into a square, and the side plate connecting hinge part 2b has an acute angle, and the side plate connecting hinge part 2a has an obtuse angle and is folded into a substantially parallelogram.

  In addition, the overlapping piece 11 of one box half 12 and the bottom piece 4b of the other box half 12 not overlapping the overlapping piece 11 overlap each other and are slidably coupled in an overlapping state by the slide coupling means 17. Similarly, the overlapping piece 11 of the other box half 12 and the bottom piece 4b of the other box half 12 not overlapping the overlapping piece 11 overlap each other and are slidable in an overlapping state by the slide coupling means 17. Join. That is, when the two box halves 12 are combined as described above to form the folding box 7, the corners of a pair of diagonal parts that are folded so as to have an acute angle when folded into a substantially parallelogram shape. The two bottom pieces 4a and 4b adjacent to each other are connected to be slidable through the inclined hinge portion 9 and the overlapping piece 11. Further, the bottom pieces 4 that are integrally formed at the time of forming the box halves 12 are not connected to each other and are in a free relationship with each other. That is, when the two box halves 12 are combined as described above to form the folding box 7, the corners of a pair of diagonal parts that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape. The two bottom pieces 4 adjacent to each other in FIG. In this way, the bottom plate constituting portion 6 is configured to be foldable via the bottom piece connecting hinge portion 5 so that the four bottom pieces 4 overlap the inner surfaces of the side plates 1.

  Thus, the synthetic resin folding box 7 can be formed by combining and bonding the two box halves 12. In the present embodiment, the two box halves 12 to be combined have the same shape, and can be molded by a common molding die.

  The overlapping margin absorbing protrusion 8 and the connecting portion 18 provided at the tip of the side plate connecting hinge portion 2b are connected by the connecting means 16 as described above. In this case, the overlapping margin absorbing portion made of a hard synthetic resin is used. The connecting portion 18 connected to the protrusion 8 in an overlapping manner may be made of a soft synthetic resin in the same manner as the side plate connecting hinge portion 2b of soft synthetic resin, but the tip of the side plate connecting hinge portion 2b of soft synthetic resin. A hard synthetic resin connecting portion 18 may be provided in the portion (in the embodiment shown in the accompanying drawings, a hard synthetic resin connecting portion 18 is provided, and the inner surface of the soft portion at the tip of the soft synthetic resin side plate connecting hinge portion 2b is provided. Alternatively, an example in which a hard synthetic resin connection 18 is overlapped and integrated on the outer surface is shown).

  Although there is no limitation in particular as the connection means 16, For example, the connection by adhesion | attachment, welding, or engagement, the connection by a fixing tool etc. can be mentioned. In the case of coupling by engagement, for example, as shown in FIGS. 13 and 14, an engagement portion 16 a is provided on the overlapping allowance absorption projection 8 and the engaged portion 16 b is disposed on the side plate coupling hinge portion 2 b (connection portion 18) side. It is also possible to provide the engaging portion 16a with the engaged portion 16b.

  Further, the slide coupling means 17 that slidably couples the overlapping piece 11 and the bottom piece 4b in an overlapping state, for example, as shown in FIG. 11, projects a slide projection 19 on one of the overlapping piece 11 or the bottom piece 4b, On the other side, a slide hole 20 larger than the slide protrusion 19 into which the slide protrusion 19 is slidably inserted is formed, and a retaining portion 20 a for preventing the slide protrusion 19 from coming out of the slide hole 20 is provided in the slide hole 20. It is configured.

  The folding box 7 made of synthetic resin having the above-described configuration has four bottom pieces in a state in which the rectangular tubular side wall constituting portion 3 composed of the four side plates 1 is assembled so as to be rectangular or square in plan view (that is, in a rectangular tubular shape). 4a and 4b form a rectangular cylindrical bottom at a right angle to each side plate 1 while the overlapping piece 11 and the bottom piece 4b are slidably overlapped and assembled, and a box having an open top is assembled.

  In the state assembled in the box shape as described above, various stored items are stored in the folding box 7 made of synthetic resin, and then the pair of opposed lower cover pieces 15b are oriented sideways with respect to the upper opening. Next, the pair of upper cover pieces 15a are moved down and placed on the lower cover pieces 15b, respectively, and the upper opening of the folding box 7 is closed by the pair of cover pieces 15a as shown in FIG.

  In this case, in the corner portion of the folding box 7, the base portion at the end portion of the upper cover piece 15 a integrally connects the corner portion formed by the upper end of the overlapping margin absorbing projection 8 and the upper end of the side plate 1 a. It is placed on the support part on the upper surface of the part 30.

  Thereafter, the stopper 35 is locked to the to-be-stopped portion 36. In this case, since the band member 34 is formed of a soft synthetic resin, the band member 34 has flexibility and a certain degree of elasticity (stretchability). Therefore, the band member 34 is bent and pulled downward. The stopper 35 provided on the lid 15a side can be easily engaged with the stopper 36 provided on the side plate 1b side and the belt can be easily locked by engaging the stopper 35 with the stopper 36 in the stretched state. Since it is stopped in the stretched state using the elasticity of the material 34, the locked state is securely held. To release the lock, the band 35 is further extended by picking the stopper 35 with a finger and pulling it downward, so that the stopper 35 is released from the locked portion 36, so that the lock can be released. it can.

  In the state assembled in the box shape as described above, the spacing holding projection 13 is fitted into the fitting recess 40 as shown in FIG. Since the angle formed between the adjacent side plates 1 through the connecting hinge portion 2 is held so as not to be smaller than 90 °, the corner portions of the pair of diagonal portions that are folded so as to become an obtuse angle when folded, When assembled in a box shape, the corners can be held at right angles by being held by the spacing projection 13 so as not to be smaller than 90 °, and the box shape is maintained even when an external force is applied to the side plate 1. It has become so.

  Here, as in the embodiment shown in the accompanying drawings, in the state assembled in a box shape, the spacing holding projection 13 is configured to be fitted into the fitting recess 40, so that the spacing holding projection 13 is box-shaped. The side plates adjacent to each other in the state of being assembled into a box shape by protruding into the interior of the box and not interfering with putting in and out the storage, and by fitting the spacing holding projection 13 into the fitting recess 40 One can be held at a right angle with a more accurate positional relationship.

  As described above, the folding box 7 is transported and stored in a box shape, storing the stored items therein, and closing the upper opening with the lid piece 15. Here, assembling into a box shape as described above, the folding boxes 7 are stacked in multiple upper and lower stages for transport and storage. Here, when the folding boxes 7 whose upper openings are closed with the lid pieces 15 are stacked in a vertical direction in a state of being assembled in a box shape and containing the stored items therein, the corners of the lower folding box 7 are viewed from above. The load concentrates and the load is transmitted downward from the corner portion. In the present invention, as described above, the upper end of the overlap allowance absorbing protrusion 8 and the overlap allowance absorbing protrusion 8 are provided. The corner portion formed with the upper end of the side plate 1 projecting is integrally connected by the corner connecting portion 30, and the upper surface of the corner connecting portion 30 is assembled in a box shape and the lid piece 15 is closed. Therefore, the lid piece 15 is reliably supported at the corner and is not bent so as to sink downward. Thereby, even if the folding boxes 7 are stacked up and down in multiple stages, they can be stably stacked without collapsing.

  At the time of non-use without storing the contents, the rectangular tubular side wall constituting portion 3 formed of the four side plates 1 as shown in FIGS. 4, 5, 6, and 7 is in an assembled state that is rectangular or square in plan view. As shown in FIGS. 10 and 10, the rectangular side wall constituting portion 3 composed of the four side plates 1 is folded so as to be a substantially parallelogram, whereby the opposing side plates 1 are substantially parallel as shown in FIGS. 1 and 3. In addition, the bottom piece 4 can be folded in a flat state along the inner surface of the side plate 1. In this case, the overlap margin between the side plates 1 facing each other in the folded state and the bottom piece 4 overlapped along the inner surface of each side plate 1 can be absorbed by the overlap margin absorbing protrusion 8 and can be folded without difficulty.

  Here, in the bottom lock type folding box 7 in which the bottom piece 4 is continuously extended to the lower end of the side plate 1 via the bottom piece connecting hinge portion 5 and the bottom piece 4 is superimposed on the inner surface of the side plate 1 when folded, Generally, the area of one piece of the bottom piece 4 is smaller than the area of one piece. Therefore, the folding piece 7 made of synthetic resin is overlapped along the inner surface of the side plate 1 as described above. When folded flat, between the side plates 1 facing each other in a flat folded state, a portion where the bottom piece 4 overlaps along the inner surface of the side plate 1 and a portion where the bottom piece 4 does not exist between the side plates 1 and a gap S is generated. However, in the present invention, the side plate 1 is bent at an obtuse angle in the folded state in the folded state as shown in FIG. Near the hinge part 2 and side plate In the gap S portion where the bottom piece 4 does not exist, the protruding tip portion of the spacing holding projection 13 abuts against the inner surface of another side plate 1 facing this, and the side plate connection at the corner that becomes an obtuse angle in the folded state The space | interval between the side plates 1 which opposes the hinge part 2 part vicinity is maintained, and the bending of the side plate 1 in this part is prevented. Therefore, even if it is folded flat and stacked in multiple stages up and down, it can be stably stacked so that no load collapse occurs.

  In this folded state of the folding box, as shown in FIG. 2 (a), the protruding tip of the spacing holding projection 13 is fitted into a tip fitting portion 41 formed on the inner surface of another side plate 1 that faces. Thus, in the folded state, the protruding tip of the spacing holding projection 13 is prevented from sliding with respect to the inner surface of the opposing side plate 1, and in the folded state, the opposing side plate maintains an accurate positional relationship. The side plate 1 can be prevented from being bent by the spacing holding projection 13.

  Further, since the folding box 7 of the present invention is made of synthetic resin, it is strong, durable, resistant to dirt, and can be cleaned, so that it can be reused many times and is economical and saves resources. Will be able to.

Further, when the rectangular tubular side wall constituting portion 3 composed of the four side plates 1 is assembled so as to be rectangular or square in a plan view or is folded into a substantially parallelogram, in the present invention, a substantially parallelogram shape is used. To one side portion of the bottom piece 4a that is continuous from one side plate 1a of the two side plates 1a, 1b on both sides of the corners of the pair of diagonal portions that are folded to have an acute angle when folded into The overlapping piece 11 protrudes through the inclined hinge part 9 inclined at an acute angle with respect to the both side plates 1 in the state of being assembled in a box shape, and the overlapping piece 11 is connected to the bottom piece connecting hinge part from the lower side of the other adjacent side plate 1b. 5 is slidably coupled to the bottom piece 4b that is continuously extended through 5 so that the square cylindrical side wall constituting portion 3 formed of the four side plates 1 is rectangular or square in plan view, Fold into shape At this time, the overlapping piece 11 slides while keeping the overlapping state with respect to the bottom piece 4b, so that the bottom piece 4a rotates with respect to the side plate 1a via the bottom piece connecting hinge portion 5 and overlaps with the side plate 1a. Is rotated through the inclined hinge portion 9, and at the same time, the bottom piece 4b is rotated relative to the side plate 1b via the bottom piece connecting hinge portion 5 while sliding in an overlapping state with respect to the overlapping piece 11. The box-shaped side wall constituting portion 3 made of the side plate 1 is made to be rectangular or square in plan view, and the four bottom pieces 4 are automatically rotated while the bottom plate constituting portion 6 made of the four bottom pieces 4 is used to rotate the box. Each bottom piece 4 is automatically formed on each side plate 1 by automatically and smoothly forming the bottom, or by folding the square tubular side wall constituting portion 3 composed of the four side plates 1 into a substantially parallelogram. Folds smoothly along the inner surface It is possible, we can solve the problem that can not be folded in folding box made of synthetic resin having a overlapping margin absorbing projection 8.

  The folding box 7 made of the synthetic resin of the present invention is such that a part or all of the side plate connecting hinge part 2, the bottom piece connecting hinge part 5, the inclined hinge part 9, and the lid piece connecting hinge part 10 are made of a soft synthetic resin. And stacked in a box shape, stacked in a substantially parallelogram shape, transported on a conveyor, or assembled in a box shape on a floor, conveyor, truck bed, or other When placed on a placing portion such as a synthetic resin folding box 7 or the like, the hinge portion made of a soft synthetic resin comes into contact with the placing portion, and the hinge portion exhibits a non-slip function. Can be prevented from slipping or slipping, and when an impact is applied, a hinge portion made of a soft resin acts to cushion the impact. In this case, if the outer surface of the hinge portion made of the soft synthetic resin is configured to protrude slightly outward from the outer surfaces of the side plate 1, the bottom piece 4, the overlapping piece 11, and the lid piece 15, a more anti-slip effect can be exhibited.

  In the embodiment shown in the attached drawings, an example in which two synthetic resin parts (that is, two box halves 12) are combined and combined to form a synthetic resin folding box 7 is shown. The folding box 7 made of synthetic resin may be formed by combining and combining three or more parts. Alternatively, the entire folding box 7 may be formed from one part made of synthetic resin and assembled.

  By the way, in embodiment shown in an accompanying drawing, although the side plate connection hinge part 2, the bottom piece connection hinge part 5, the inclination hinge part 9, and the lid piece connection hinge part 10 formed the part or all with soft synthetic resin, the example was shown. The side plate 1 and the bottom piece are formed as a thin hinge portion made of the same hard synthetic resin as the side plate 1, the bottom piece 4, the overlapping piece 11, and the like. You may form integrally with 4 grade | etc.,.

  Further, the side plate connecting hinge portion 2, the bottom piece connecting hinge portion 5, the inclined hinge portion 9, the lid piece connecting hinge portion 10 and the like are connected to the side plate 1, the bottom piece 4, the overlapping piece 11, the side plate connecting hinge portion 2, the bottom piece connecting hinge portion 5, the inclined portion. The hinge portion 9 and the lid piece connecting hinge portion 10 are formed separately without being integrally formed, and overlap with the side plates 1, the side plate 1 and the bottom piece 4, and the bottom piece 4 by the connecting means through the separate hinge portions. The pieces 11 may be connected in a foldable manner. In this case, each hinge part may be made of synthetic resin or metal.

It is a perspective view of the folded state of the synthetic resin folding box of this invention. (A) is the expanded sectional view which fractured | ruptured the AA line | wire of FIG. 1 same as the above, (b) is the state where the space | interval holding | maintenance protrusion was fitted in the recessed part in the state assembled in the box shape. It is a principal part expansion perspective view shown. (A) is sectional drawing of the BB line of FIG. 1 same as the above, (b) is a principal part expanded sectional view of (a). It is the perspective view seen from the downward direction of the state which assembled the folding box made from a synthetic resin same as the above in the box shape. It is the perspective view seen from the upper direction of the state which assembled the folding box made from a synthetic resin same as the above in the box shape. It is a plane sectional view of the state assembled in the box shape same as the above. It is a bottom view of the state assembled in the box shape same as the above. It is sectional drawing of CC line of FIG. 6 same as the above. It is sectional drawing of the DD line of FIG. 6 same as the above. It is the perspective view seen from the lower part which shows the state in the middle of folding same as the above. The part which connected the overlap piece and the bottom piece with the slide coupling | bonding means same as the above is shown, (a) is sectional drawing, (b) is the perspective view which fractured | ruptured partially. (A) It is sectional drawing of the state which piled up the upper and lower multistage in the state which folded the synthetic resin folding box same as the above, (b) is an example in which the upper and lower synthetic resin folding boxes were stacked up and down It is sectional drawing shown. (A) is the perspective view seen from the top which shows the expansion | deployment state of a box half body same as the above, (b) is an expansion perspective view of the X section of (a). It is the perspective view seen from the bottom which shows the unfolded state of a box half body same as the above. A prior art example is shown, (a) is a developed view, and (b) is a sectional view in a folded state. It is explanatory drawing which shows the problem of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side plate 2 Side plate connection hinge part 3 Square cylindrical side wall structure part 4 Bottom piece 5 Bottom piece connection hinge part 6 Bottom plate structure part 7 Folding box 8 Overlapping allowance absorption protrusion 13 Spacing part protrusion

Claims (2)

A pair of pairs of side plates, which are adjacent to each other in the front, rear, left, and right sides, are adjacent to each other in a box shape with the side plate connecting hinges connected to each other so as to be foldable and assembled into a box shape. Square tubular side wall components that can be folded flatly after being folded into a substantially parallelogram shape so that the corners of the corners are acute and the corners of the other pair of diagonals are obtuse, and four The bottom piece is foldably extended from each lower side of each side plate via a bottom piece connecting hinge part, and in the folded state, each bottom piece is folded so as to overlap the inner surface of each side plate, and the rectangular tubular side wall component is box-shaped In the folding box made of synthetic resin, with the bottom plate component part that the bottom pieces overlap each other in the assembled state to form a box-shaped bottom,
The four side plates are flattened at the end of one of the two side plates on both sides of the corners of the pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. Folding projections for overlapping allowance absorption corresponding to the above overlapping thickness in a folded state where each bottom piece is folded and overlapped with the inner surface of each side plate,
Near the side plate coupling hinge portion of at least one of the side plates adjacent to each other through the side plate coupling hinge portion at the corners of the pair of diagonal portions that are folded so as to have an obtuse angle when folded into the substantially parallelogram shape. In the folded state of the folding box, a spacing holding projection for projecting the spacing between the side plates facing each other is projected from the side plate, and in the state assembled in a box shape, the side plate connecting hinge portion is formed by the spacing holding projection. Is held so that the angle formed between the side plates adjacent to each other does not become smaller than 90 ° ,
A projection for holding a space is provided on one side plate of adjacent side plates via a side plate connecting hinge, and a projection for holding a space is fitted on the inner surface of the other side plate in a state of being assembled in a box shape. A synthetic resin folding box characterized in that a concave portion is provided . A pair of pairs of side plates, which are adjacent to each other in the front, rear, left, and right sides, are adjacent to each other in a box shape with the side plate connecting hinges connected to each other so as to be foldable and assembled into a box shape. Square tubular side wall components that can be folded flatly after being folded into a substantially parallelogram shape so that the corners of the corners are acute and the corners of the other pair of diagonals are obtuse, and four The bottom piece is foldably extended from each lower side of each side plate via a bottom piece connecting hinge part, and in the folded state, each bottom piece is folded so as to overlap the inner surface of each side plate, and the rectangular tubular side wall component is box-shaped In the folding box made of synthetic resin, with the bottom plate component part that the bottom pieces overlap each other in the assembled state to form a box-shaped bottom,
The four side plates are flattened at the end of one of the two side plates on both sides of the corners of the pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. Folding projections for overlapping allowance absorption corresponding to the above overlapping thickness in a folded state where each bottom piece is folded and overlapped with the inner surface of each side plate,
Near the side plate coupling hinge portion of at least one of the side plates adjacent to each other through the side plate coupling hinge portion at the corners of the pair of diagonal portions that are folded so as to have an obtuse angle when folded into the substantially parallelogram shape. In the folded state of the folding box, a spacing holding projection for projecting the spacing between the side plates facing each other is projected from the side plate, and in the state assembled in a box shape, the side plate connecting hinge portion is formed by the spacing holding projection. Is held so that the angle formed between the side plates adjacent to each other does not become smaller than 90 °,
Folding Folding box folding space holding projections while the synthetic resin you characterized by comprising providing a portion fitted tip protrusion tips of spacing projections on the inner surface of the side plate that faces is fitted Box .

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