JP4634876B2 - 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 form 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 formed of synthetic resin, the folding line portion that connects 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 cannot be said that the overlap margin overlapped by the bottom piece is not absorbed. 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 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 particular, when stacking up and down in a folded state in a folded state, the load from above is concentrated on the overlapping margin absorbing protrusion 8 portion, but when stacked in a shifted state as shown in FIG. 16, the upper folding box A load transmitted downward from the overlapping margin absorbing protrusion 8 is applied to the side plate 1 immediately above the portion having the gap S between the side plates 1 of the lower folding box. There is a problem that the portion 1 is greatly bent downward, and the load collapses more easily.
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. Although 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 steps 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, and it can be prevented from collapsing with a simple structure, and it is strong, easy to remove dirt, and can be washed many times. It is an object of the present invention to provide a synthetic resin folding box that can be reused.

  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, An interval holding projection 13 is provided to protrude from the side plate 1 so as to hold the interval between the side plates 1 facing each other in the folded state at a 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 characterized by this.

  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 along the inner surface of each side plate 1, there is a gap in the portion where the bottom piece 4 between the opposing side plates 1 does not exist in a flat folded state. S occurs and the side plate 1 tends to bend in this portion, but in the present invention, the side plate facing in the folded state 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 as described above. Since the interval holding projection 13 for holding the interval between the side plates 1 protrudes from the side plate 1, it is possible to prevent the side plate 1 from bending at a portion where the bottom piece 4 between the side plates 1 does not exist, and in particular, it is folded flat. When the folded folding boxes are stacked up and down in multiple stages, the side plate 1 does not bend downward due to a load from above even in a place where the bottom piece 4 between the side plates 1 does not exist, and is folded flat. Collapsing be stacked in multiple stages in the vertical can be stacked stably so as not to generate in it state.

  In addition, it is preferable that the spacing holding projection 13 is positioned in the vicinity of the overlapping margin absorbing projection 8 in a folded state.

  When stacked up and down in a folded state, the load from above is concentrated on the overlapping portion absorbing projection 8 and transmitted downward, but the folding box 7 in the flat folded state is displaced. When stacked, the overlap allowance absorbing protrusion 8 of the lower folding box 7 is not located directly below the overlap allowance absorbing protrusion 8. However, since the spacing holding projection 13 is located in the vicinity of the overlap allowance absorbing projection 8 in the folded state as described above, it is transmitted from the overlap allowance absorbing projection 8 of the upper folding box 7 in a concentrated manner. Can be supported by the spacing-holding projection 13 of the lower folding box 7, and the side plate 1 is prevented from bending in this portion, and the load collapses even if they are stacked slightly shifted when stacked in the upper and lower stages. Can be prevented.

  Further, it is preferable that the interval holding projections 13 are provided so as to protrude from the opposite side plates 1 facing each other in the folded state, and the protruding tip portions of the both interval holding projections 13 are in contact with each other in the folded state.

  By adopting such a configuration, when the protruding length of the spacing holding projection 13 from the side plate 1 is folded, the protruding length is ½ of the gap between the opposing side plates 1. It is possible to shorten the distance between the projections 13 for keeping the distance as much as possible when assembling into a box shape and taking in and out the stored items.

  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 in the vertical direction, it is possible to reliably prevent the side plate from bending downward due to a load from above even in a place where the bottom piece does not overlap between the side plates facing vertically. Therefore, it is possible to prevent the cargo from collapsing with a simple configuration.

  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.

  An interval holding projection 13 is provided on the inner surface of the side plate 1, and the protruding position of the interval holding projection 13 on the side plate 1 is such that a bottom piece 4 to be described later overlaps along the inner surface of the side plate 1. Is folded from the inner surface of the side plate 1 so that the spacing holding projection 13 is positioned in the gap S portion where the bottom piece 4 does not exist between the opposing side plates 1.

  In the embodiment shown in the accompanying drawings, it is configured such that the interval holding projections 13 project from the opposite side plates 1 facing each other in the folded state, and the protruding tip portions of the both interval holding projections 13 abut in the folded state. is there. In addition, the gap-holding protrusion 13 is in the vicinity of the overlap allowance absorbing protrusion 8, specifically, the upper end portion of the overlap allowance absorbing protrusion 8 (the upper opening side of the folding box 7 of the overlap allowance absorbing protrusion 8). It is provided on the inner surface of both side plates 1 in the vicinity of the upper end).

  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 coupling hinge portion 2 (hereinafter referred to as a side plate coupling hinge portion 2b) is provided, a connecting portion 18 is provided at the tip of the side plate coupling hinge portion 2b, and an upper end portion of the inner surface of one side plate 1a is provided. In the vicinity of the overlap allowance absorbing protrusion 8 and on the inner surface of the other side plate 1b In the vicinity of the side plate connecting hinge portion 2b, a spacing holding projection 13 is provided to project from the lower side of each of the adjacent pair of side plates 1a, 1b via the bottom piece connecting hinge portion 5, respectively. Further, of the two adjacent bottom pieces 4a and 4b, an acute angle (with respect to the bottom piece connecting hinge portion 5 connecting the bottom piece 4a to the side end opposite to the other bottom piece 4b adjacent to one bottom piece 4a ( In the embodiment, the overlapping piece 11 is arranged continuously through an inclined hinge portion 9 inclined at 45 °. 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 can be slid freely in the 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 the 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.

  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 through the bottom piece connecting hinge portion 5 and folded, the bottom piece 4 is overlapped with the inner surface of the side plate 1. In general, the area of 41 bottom pieces is smaller than the area of the above, and therefore the folding box 7 made of synthetic resin is folded flatly so as to overlap the bottom piece 4 along the inner surface of the side plate 1 as described above. In this case, there are 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 the gap S is generated between the side plates 1 facing each other in a flat folded state. In the present invention, the side plate 1 tries to bend in the portion where the gap S is generated. In the folded state, as shown in FIG. 2, the side plate 1 is opposed in the gap S portion where the bottom piece 4 between the opposed side plates 1 does not exist. Inner surface of the side plate 1 The projecting tips of the spacing holding projections 13 projecting from each other come into contact with each other to maintain the spacing between the opposing side plates 1 in this portion and prevent the side plate 1 from bending at the portion where the bottom piece 4 between the side plates 1 does not exist. It is supposed to be. Thereby, even if the folding boxes in a flat folded state are stacked up and down in multiple stages, a gap S is formed in the spacing holding projection 13 at a location where the bottom piece 4 between the side plates 1 does not exist as shown in FIG. The side plates 1 that face each other are kept spaced apart, and the side plates 1 do not bend downward, and can be stably stacked so that they do not collapse even if they are folded flat and stacked in multiple stages. it can.

  Here, when folded up and down in multiple stages, the load from above is concentrated on the overlap allowance absorbing protrusion 8 and transmitted downward, but as shown in FIG. When the folded folding boxes 7 are shifted and stacked, the overlapping allowance absorbing protrusions 8 of the lower folding box 7 are not positioned directly below the overlapping allowance absorbing protrusions 8, and a smooth load is transmitted downward. However, the side plate 1 is easily bent. In the present invention, as shown in FIG. 12 (a), the spacing holding projection 13 is positioned in the vicinity of the overlap absorption projection 8 in the folded state. Even when the folding boxes 7 in a flat folded state are displaced and stacked as in b), in the lower folding box 7 near the lower portion of the overlapping margin absorbing protrusion 8 of the upper folding box 7. Hold between opposing side plates 1 The spacing holding projection 13 is present, and the load transmitted in a concentrated manner from the overlapping margin absorbing projection 8 of the upper folding box 7 is supported by the spacing holding projection 13 of the lower folding box 7. Thus, it is possible to prevent the side plate 1 from being bent at this portion, and to prevent the load from collapsing even if the plates are stacked slightly deviated when stacked in the upper and lower stages.

  Further, by providing the spacing holding projections 13 on the opposing side plates 1 respectively, 1 / of the gap between the opposing side plates 1 when the protruding length of the spacing holding projection 13 from the side plate 1 is folded. The projecting length of 2 can be shortened, and the projecting length can be shortened so that the spacing-holding projection 13 can be prevented from interfering as much as possible when assembling into a box shape and taking in and out the stored items.

  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.

  By the way, in the embodiment shown in the accompanying drawings, in the state assembled in a box shape, the bottom of the folding box 7 can be seen only from the two bottom pieces 4a as seen from the top opening of the folding box 7, as shown in FIG. It is configured.

  That is, the bottom piece 4a that is connected to the lower side of one side plate 1a of the side plates 1a and 1b on both sides of the corner that is folded so as to have an obtuse angle when folded is shown in FIGS. As shown, it is composed of a right-angled trapezoidal piece portion 21 having a right-angled trapezoidal shape that continues along the bottom piece connecting hinge portion 5 and a stepped overlapping piece portion 22 having a substantially parallelogram shape.

  The right-angle trapezoid piece 21 has a right-angle trapezoidal shape, and its lower base (that is, the lower bottom of the right-angle trapezoid) is along the bottom piece connecting hinge part 5. An end on the corner side which is located at an end on the corner side which is folded so as to have an obtuse angle on the lower side of the side plate 1a and which is folded so that a vertical side of the right-angled trapezoidal piece 21 becomes an obtuse angle on the lower side of the side plate 1a And the length of the vertical side is set equal to the length of the lower side of the other side plate 1b of the side plates 1a and 1b on both sides of the corner. The other end of the lower base of the right trapezoid piece 21 (that is, the point where the lower base of the right trapezoid and the oblique side intersect) is the side plate 1a from the other end of the side plate 1a (in the embodiment, the end on the overlapping margin absorbing projection 8 side). It is located on one end side with a predetermined deviation. Further, the hypotenuse of the right-angled trapezoidal piece portion 21 is inclined by 45 ° with respect to the lower base.

  A stepped overlapping piece 22 is integrally connected from the oblique side of the right-angled trapezoidal piece 21, and the stepped overlapping piece 22 has a substantially parallelogram shape with one side sandwiching an obtuse angle of the substantially parallelogram. A stepped overlapping piece 22 having a substantially parallelogram-like shape is continuously extended from the end of the oblique side of the right-angle trapezoidal piece 21 on the bottom piece connecting hinge 5 side to the half of the total length. The other side across the obtuse angle of the substantially parallelogram is foldably connected to the side plate 1a via the bottom piece connecting hinge portion 5. The upper surface of the stepped overlapping piece portion 22 is stepped downward from the upper surface of the right-angle trapezoidal piece portion 21.

  Overlapping pieces 11 having a right isosceles triangle shape are projected from the hypotenuse opposite to the hypotenuse of the right-angle trapezoidal piece portion 21 of the stepped duplication piece portion 22 through the inclined hinge portion 9.

  Of the two sides sandwiching the right angle of the overlapping piece 11 having a right isosceles triangle shape, one side is a bottom piece connecting hinge portion 5 of a stepped overlapping piece portion 22 having a substantially parallelogram shape in an unfolded state as shown in FIGS. In addition, the other side of the two sides sandwiching the right angle of the overlapping piece 11 having a right isosceles triangle shape is unfolded and the overlapping margin absorbing protrusion 8 is in a developed state. It is set so as to be substantially in a straight line with the inner surface of the plate in plan view.

  The lower surface side of the right-angle trapezoidal piece portion 21 is a groove portion 25 as shown in FIG. 14, a portion of the groove portion 25 is a deep groove portion 26 having a deep depth, and the remaining portion of the groove portion 25 is deep. A shallow shallow groove portion 27 is formed. In the embodiment, the bottom rib 28 protrudes from the upper bottom portion of the groove portion 25 on the lower surface of the right-angle trapezoidal piece portion 21, whereby the shallow groove portion having a shallow depth at which the tip of the bottom rib 28 becomes the bottom. 27, and the lower opening of the deep groove portion 26 is continuous with the lower opening of the shallow groove portion 27.

  The depth of the shallow groove portion 27 is the same as or approximately equal to the thickness of the bottom piece 4b, and the depth of the deep groove portion 26 is equal to or substantially equal to the sum of the thickness of the bottom piece 4b and the thickness of the overlapping piece 11. Further, the depth of the deep groove portion 26 is the same as or substantially equal to the thickness of the stepped overlap piece portion 22.

  Then, the folding box 7 is assembled into a box shape, and the oblique sides of the two right-angle trapezoidal pieces 21 are brought into contact with or close to each other as described above so that the upper surfaces of the two right-angled trapezoidal pieces 21 are continuously flush with each other. In a state in which the bottom surface when viewed from the upper opening is formed, another deepening portion 26 facing the bottom piece 4a is formed in the deep groove portion 26 on the back surface of one right-angled trapezoidal piece portion 21, as shown in FIGS. The stepped overlapping piece 22, the inclined hinge portion 9, and the overlapping piece 11 of the bottom piece 4 a are fitted to overlap the lower surface side of the right-angled trapezoidal piece portion 21, and the overlapping pieces 11 of the shallow groove portion 27 and the deep groove portion 26 are fitted. It fits in the lower surface side of the overlapping piece 11 of a part, and overlaps the lower surface side of the right-angled trapezoidal piece part 21 and the lower surface side of the overlapping piece 11. Both the upper and lower surfaces of the bottom of the box are flush with each other, and in particular, the upper surface of the bottom of the box has two right-angle trapezoidal pieces 21 with the oblique sides of the two right-angled trapezoidal pieces 21 in contact with or close to each other. Since the upper surface of the box is formed so as to be flush with each other, the bottom when the inner surface of the box is viewed is beautiful, and it does not get caught when a stored item is put in.

  And in the state which assembled the folding box 7 in the box shape, since the columnar protrusion part used as the overlap allowance absorption protrusion 8 is provided in the corner part of a pair of diagonal part, this overlap allowance absorption protrusion 8 and Due to the presence of the columnar protrusions, the rectangular tubular shape of the rectangular tubular side wall constituting portion 3 that is formed into a rectangular tubular shape is difficult to be collapsed, and at the same time, the overlapping pieces 11 that continue from the bottom piece 4a through the inclined hinge portion 9. And the other bottom piece 4b are slidably connected in an overlapping state, so that the bottom pieces 4a and 4b are side plates 1a and 1b, respectively, as long as the square tubular side wall constituting portion 3 formed of the four side plates 1 is a square tubular shape. The bottom pieces 4a and 4b are not opened and the bottom of the box does not come off.

  Therefore, the stored items can be easily taken in and out in a state where the folding box 7 is assembled in a box shape.

  In the embodiment shown in the accompanying drawings, the upper cover pieces 15a, 15a are foldably connected to the upper end edges of the pair of side plates 1a, 1a facing each other among the four side plates 1, and the other pair of side plates 1b. 1b, the lower lid pieces 15b, 15b are connected in a foldable manner, and the upper lid piece 15a is supported by overlapping the lower lid piece 15b, and the upper lid pieces 15a, 15a The example in which the base portion of the side end portion is placed and supported on the support portion on the upper surface of the corner connecting portion 30 has been shown, but the upper end edges of the pair of side plates 1a and 1a facing each other among the four side plates 1 are shown. Only the cover piece 15 may be foldably connected, and the base portion of the cover piece 15 may be placed on and supported by the support portion on the upper surface of the corner connecting portion 30.

  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. You may connect the piece 11 so that folding is possible respectively. 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. It is the expanded sectional view in which the AA line of Drawing 1 same as the above was fractured. (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 ends in the state which folded the synthetic resin folding box same as the above, (b) is the example where the upper and lower synthetic resin folding boxes shifted up and down and were stacked FIG. It is the perspective view seen from the top which shows the expansion | deployment state of a box half body same as the above. 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 (3)

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,
In the folded state of the folding box, a spacing holding projection is provided to project from the side plate so as to hold the interval between the side plates facing each other in the folded state at a position where there is no bottom piece between the side plates facing each other. Folding box made of synthetic resin.   2. The synthetic resin folding box according to claim 1, wherein the spacing holding projection is positioned in the vicinity of the overlapping margin absorbing projection in the folded state. 2. The structure according to claim 1, wherein the gap holding projections are provided so as to protrude from both side plates facing each other in the folded state, and the protruding tip portions of both the gap holding projections are in contact with each other in the folded state. A folding box made of synthetic resin according to claim 2.

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