JP4758792B2 - 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 corrugated cardboard box composed of four bottom pieces that are foldably extended from the lower sides of each of the four side plates via folding lines so as to overlap the inner surface of each side plate. In a pair of diagonal parts that are folded so as to have an acute angle when folded into a parallelogram shape, it is assembled in a box shape on one side part of a bottom piece that continues from one side plate among two side plates adjacent to both sides. Flat in state The overlapping piece protrudes through an inclined fold line inclined at an acute angle with respect to the lower side of the both side plates as viewed, and the overlapping piece extends from the lower side of the other side plate adjacent to the bottom piece through the bottom piece connecting hinge portion. In the overlapped state, it is overlapped and fixed with adhesives and stoppers, and the two bottom pieces adjacent to each other in the pair of diagonal parts that are folded so as to be obtuse when folded into a substantially parallelogram shape They are free from each other as unconnected. 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 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 assembly box is made 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. 16, the thin side plate connection in which the adjacent side end portions of the four side plates 1 facing each other in the front, rear, left and right directions 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 shape at the end of one side plate 1a out of two side plates 1a and 1b adjacent to both sides in a pair of diagonal portions that are folded to form an acute angle, and each bottom piece. In the folded state where 4 is overlapped with the inner surface of each side plate, an overlap allowance absorbing portion 8 corresponding to the above overlap thickness is provided to cope with this.

  In the conventional example shown in Patent Document 2, a bottom lock type folding box is used. In the developed view of FIG. 16 (a), the side of the bottom piece 4a that continues from the side plate 1a via the bottom piece connecting hinge portion 5 is used. The overlapping piece 11 extending from the end via the inclined hinge portion 9 and the bottom piece 4b extending from the side plate 1b via the bottom piece connecting hinge portion 5 are completely fixed by welding or the like.

  However, the synthetic resin folding box provided with the overlap allowance absorbing portion 8 as in the conventional example shown in the above-mentioned Patent Document 2 is a bottom lock type in which the overlapping piece 11 and the bottom piece 4 are completely fixed. Therefore, from the state assembled in a box shape, it is possible to fold the folds so that the corners of a pair of diagonal parts are acute angles and the corners of the other pair of diagonal parts are obtuse angles. The problem that it cannot be folded and does not function as a folding box occurs.

  Hereinafter, the reason why the overlapping piece 11 and the bottom piece 4b that are completely fixed to each other in the synthetic resin folding box provided with the overlap allowance absorbing portion 8 cannot be folded will be described.

  That is, as shown in FIG. 16 (b), the overlap margin absorbing portion 8 exists in a portion where the side plates 1a, 1b are bent at an acute angle, but each side plate 1a, 1b in the portion where the side plates 1a, 1b are bent at an acute angle. The relationship between the hinge portions 2, 5, 9, the bottom pieces 4a, 4b, and the overlap allowance absorbing portion 8 is as shown in the schematic diagram of FIG. In FIG. 17, a description will be given as a model in which the adjacent bottom pieces 4 a and 4 b are connected via the inclined hinge portion 9 and the overlapping piece 11 is omitted. Further, in the model of FIG. 17, the extension line of the inclined hinge portion 9 is a corner portion in a plan view in a state assembled in a box shape as shown in FIG. 17 (a) (that is, the side plates 1a and 1b are at right angles). Of the side plates 1a and 1b and the lower sides of the side plates 1a and 1b are inclined at 45 ° (that is, the inclined hinge portion 9 has an angle of 2 formed by the side plates 1a and 1b in FIG. 17A). It is assumed that it is located on the equidistant line M1).

  In FIG. 17A, when a line L1 perpendicular to the lower side of the side plate 1a is drawn from an arbitrary point A on one side plate 1a in the drawing, the intersection point where the line L1 intersects the inclined hinge portion 9 is C1, and the other When a line L1 ′ perpendicular to the lower side of the side plate 1b is drawn from an arbitrary point B of the side plate 1b, the intersection point where the line L1 ′ intersects the inclined hinge portion 9 is C2, and the points A and B are respectively shown in FIG. Assuming that the corners D1 are separated from the corner D1 by the same dimension (P1 = P′1 in FIG. 17A), the intersection C1 and the intersection C2 are a specific point C of the inclined hinge portion 9. Are consistent.

  Here, as the angle formed by the side plates 1a and 1b changes gradually from the 90 ° state as shown in FIG. 17A (that is, the side plates 1a and 1b are part of the side plate connecting hinge portion 2). In order for both bottom pieces 4a and 4b, which are folded via the bottom piece connecting hinge part 5 to the side plates 1a and 1b, to be folded via the inclined hinge part 9) The inclined hinge portion 9 must always be positioned on a bisector obtained by dividing the angle α formed by the side plates 1a and 1b into two equal parts.

  Therefore, the side plate 1b is overlapped from the state shown in FIG. 17A and pivoted as shown in FIG. 17B around the side plate connecting hinge 2 at the tip of the marginal absorption portion 8, and both bottom pieces 4a and 4b are inclined hinge portions. When it is assumed that both bottom pieces 4a and 4b can be rotated and folded in a direction overlapping each side plate 1a and 1b around the bottom piece connecting hinge portion 5 while being folded at 9 parts, both side plates 1a and 1b are extended. A bisector that intersects the line α at the point D2 and bisects the angle α formed by the side plates 1a and 1b is indicated by M2 in FIG. 17B, and the inclined hinge portion 9 is on the bisector M2. In this state, the lines L2 and L2 ′ perpendicular to the lower sides of the side plates 1a and 1b are drawn from the points A and B on the paper surface in FIG. Intersects with the inclined hinge portion 9 located on the bisector M2 Intersection C1, C2 is as shown in FIG. 17 (b), the intersection C1, C2 is not match on the inclined hinge 9. However, the intersection points C1 and C2 are originally a specific point C on the inclined hinge portion 9 as described above, and the fact that the intersection points C1 and C2 do not coincide as shown in FIG. 9 proves that it cannot be folded.

  In this way, the folding box provided with the synthetic resin overlapping allowance absorbing portion 8 shown in Patent Document 2 has the overlapping piece 11 welded and fixed to the adjacent bottom piece 4b, so that it can be folded at an acute angle. In the section, the bottom pieces 4a and 4b cannot be folded so as to overlap the side plates 1a and 1b, respectively, which is difficult to implement. Moreover, if it tries to forcefully fold by applying a big force, there exists a problem that the bottom pieces 4a and 4b, the duplication piece 11, and the side plates 1a and 1b will be deformed or damaged and cannot be used as a bottom folding box. .

  Therefore, in the process leading to the present invention, the inventor has assembled the box-like shape by connecting the side end portions of the four side plates 1 facing each other in the front, rear, left and right directions so as to be foldable by the side plate connecting hinge portion 2. In a plan view rectangular or square shape, and when folded, the corners of a pair of diagonal portions become acute and the corners of the other pair of diagonal portions have an obtuse angle and are folded into a substantially parallelogram. Four pieces of a rectangular tubular side wall constituting portion 3 that can be folded flatly and foldably extending from the lower sides of the four side plates 1 via the bottom piece connecting hinge portions 5 so as to overlap the inner surface of each side plate 1. In the folding box 13 made of synthetic resin composed of the bottom plate constituting portion 6 made of the bottom piece 4, the pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape on both sides Adjacent In the folded state in which the four side plates 1 are folded into a substantially parallelogram at the end of one side plate 1 of the side plates 1 and each bottom piece 4 is overlapped with the inner surface of each side plate 1, the overlap allowance absorption corresponding to the above-described overlap thickness is achieved. Of the bottom piece 4 that is continuous from one side plate 1 of the two side plates 1 adjacent to both sides in a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. On one side, an overlapping piece 11 protrudes through an inclined hinge portion 9 inclined at an acute angle with respect to the lower side of the both side plates 1 in the state of being assembled in a box shape, and the overlapping piece 11 is connected to the other adjacent side plate 1. It was considered to slidably couple to the bottom piece 4 that continued from the lower side through the bottom piece connecting hinge portion 5 in an overlapping state.

  In this structure, the rectangular side wall constituting portion 3 composed of the four side plates 1 is folded into a substantially parallelogram and then folded so as to be flat, so that the opposing side plates 1 are substantially parallel and the side plate 1 The bottom plate 4 can be folded along the inner surface, and in this case, the side plates 1 facing each other in the folded state and the inner surfaces of the side plates 1 even though the folding box 13 is made of synthetic resin. The overlap allowance with the bottom piece 4 that is overlapped with each other is absorbed by the overlap allowance absorbing portion 8 and can be folded without difficulty.

However, in the case where the overlapping piece 11 is slidably coupled to the bottom piece 4 extending from the lower side of the other adjacent side plate 1 through the bottom piece connecting hinge portion 5 in an overlapping state, it is assembled in a box shape, The bottom piece 4 that overlaps the overlap piece 11 is only slidably coupled to the overlap piece 11, and the tip of the bottom piece 4 is not supported by anything, and a load acts from above. In such a case, the free end portion of the tip of the bottom piece 4 bends downward and cannot sufficiently support the load, or an unreasonable force acts on the connecting portion with the overlapping piece 11 to break the connecting portion, or It has been found that there is a problem that a portion bent below the tip of the bottom piece 4 is caught by another object and becomes difficult to handle.
JP-A-8-169436 JP-A-8-282648

  The present invention has been invented in view of the above-described conventional problems, and the rectangular tubular side wall structure portion including four side plates is rectangular or square in plan view despite being made of synthetic resin. By simply turning the four bottom pieces, the bottom of the box is automatically and smoothly formed by the bottom plate constituting portion of the four bottom pieces, or the rectangular tubular side wall constituting portion of the four side plates is formed. By folding it so that it becomes a substantially parallelogram, each bottom piece can be automatically folded smoothly along the inner surface of each side plate. The tip of the connected bottom piece can be prevented from bending downward, the connecting part that is slidably connected to the overlapping piece can be prevented from being damaged, and the load supporting force from above can be further increased. Strong, durable It is hard to get dirty and can be cleaned, so it can be reused many times, and it is economical and resource-saving. Also, even if it is bent repeatedly, the hinge part will not crack, It is an object of the present invention to provide a synthetic resin folding box having a buffering effect.

  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. A rectangular shape or a square shape in plan view when assembled in a box shape, and substantially parallel sides so that the corners of a pair of diagonal portions become acute angles and the corners of the other pair of diagonal portions become obtuse angles when folded. The rectangular tubular side wall constituting part 3 that can be folded flatly after being folded into a shape, and the bottom piece 4 are foldably extended from the respective lower sides of the four side plates 1 via the bottom piece connecting hinge parts 5, respectively. In the folded state, each bottom piece 4 is folded so as to overlap the inner surface of each side plate 1, and the bottom pieces 4 are overlapped with each other to form a box-shaped bottom in a state where the rectangular tubular side wall constituting portion 3 is assembled in a box shape. Bottom plate component In one of the two side plates 1 adjacent to each other in the pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape in the synthetic resin folding box 13 provided with In the folded state in which the four side plates 1 are flatly folded and the bottom pieces 4 are overlapped with the inner surface of each side plate 1, an overlap margin absorbing portion 8 corresponding to the overlap thickness is provided at one end, and the substantially parallelogram shape is provided. In a pair of diagonal parts that are folded so as to have an acute angle when folded into two, one side part of the bottom piece 4 that is continuous from one side plate 1 of the two side plates 1 adjacent to both sides is assembled in a box shape. The overlapping piece 11 protrudes through an inclined hinge portion 9 inclined at an acute angle with respect to the lower side of the both side plates 1 in plan view, and the overlapping piece 11 is connected to the bottom piece connecting hinge from the lower side of the other side plate 1 adjacent to the side plate 1. Ream via part 5 The bottom piece 4 is slidably coupled to the bottom piece 4 in an overlapped state, and is slidably coupled to the overlapping piece 11 in a state of being assembled in a box shape. 4 is provided with a support means 7 to be supported by 4.

  By adopting such a configuration, the opposing side plates 1 are substantially parallel by folding the rectangular tubular side wall constituting portion 3 composed of the four side plates 1 into a flat shape after being folded into a substantially parallelogram. In addition, the bottom piece 4 can be folded along the inner surface of the side plate 1, and in this case, although the folding box 13 is made of synthetic resin, the side plate 1 facing each other in the folded state, An overlapping margin with the bottom piece 4 that is overlapped along the inner surface of the side plate 1 is absorbed by the overlapping margin absorbing portion 8 and can be folded without difficulty. When the part 3 is assembled into a rectangular or square shape in plan view, or folded flatly after being folded into a substantially parallelogram, as described above, it is folded so as to have an acute angle when folded into a substantially parallelogram. Be In the pair of diagonal portions, one side portion of the bottom piece 4 that is continuous from one side plate 1 of the two side plates 1 adjacent to both sides is inclined at an acute angle with respect to the side plates 1 in a state of being assembled in a box shape. The overlapping piece 11 protrudes through the inclined hinge portion 9, and the overlapping piece 11 is slidably coupled to the bottom piece 4 extending from the lower side of the other adjacent side plate 1 through the bottom piece connecting hinge portion 5 in an overlapping state. Therefore, the bottom plate made of the four bottom pieces 4 is automatically rotated while the square tubular side wall constituting portion 3 made of the four side plates 1 is made to be rectangular or square in plan view. Each bottom piece 4 is automatically formed by automatically and smoothly forming the bottom of the box by the component 6, or by folding the square cylindrical side wall component 3 composed of the four side plates 1 into a substantially parallelogram. Smoothly along the inner surface of each side plate 1 It can be folded for the first time, and the bottom of the box is automatically formed in a flat state only by making the rectangular tubular side wall component 3 rectangular or square in plan view or by folding it into a substantially parallelogram. Thus, the so-called bottom lock type synthetic resin folding box 13 that can be folded automatically can be realized. In addition, support means 7 is provided for supporting the distal end portion of the bottom piece 4 slidably coupled to the overlapping piece 11 in a box-shaped state away from the bottom piece connecting hinge portion 5 to another adjacent bottom piece 4. Therefore, the tip of the bottom piece 4 that overlaps the overlapping piece 11 and is slidably connected to the overlapping piece 11 is supported by the other bottom piece 4 so as not to bend. As a result, the supporting force of the load by the bottom piece 4 can be increased, and it is possible to prevent an undue force from acting on the slidably connected portion with the overlapping piece 11 to break the connected portion, Since the tip of the bottom piece 4 does not bend downward, there is no risk of being caught by other objects, and handling becomes easy. Further, since it is a folding box 13 made of a bottom lock type synthetic resin, it has high strength, is highly durable, is not easily soiled, and can be cleaned, so that it can be reused any number of times and is economical and saves resources. Will be able to.

  In addition, the tip of the bottom piece 4 that is slidably coupled to the overlapping piece 11 in the state of being assembled in a box shape is folded so as to have an acute angle when folded into a substantially parallelogram shape. It is preferable that the other adjacent bottom piece 4 is supported by the supporting means 7.

  In this way, when the adjacent bottom pieces 4 which are folded so as to have an acute angle connected via the inclined hinge part 9, the overlapping piece 11, and the slidable connecting part are assembled in a box shape, the support means 7 By being supported, the bottom pieces 4 adjacent to each other in the state of being assembled into a box shape are in an accurate positional relationship with each other via the inclined hinge portion 9, the overlapping piece 11, and the slidable connecting portion. Support can be ensured with an accurate positional relationship.

  In addition, the tip of the bottom piece 4 that is slidably coupled to the overlapping piece 11 in the state of being assembled in a box shape is folded so as to have an obtuse angle when folded into a substantially parallelogram shape. It is preferable that the other adjacent bottom piece 4 is supported by the supporting means 7.

  With such a configuration, the bottom plate 4 that overlaps the overlapping piece 11 is connected via the inclined hinge portion 9, the overlapping piece 11, and the slidable connecting portion in the state assembled in a box shape, and the inclined hinge portion 9. The support piece 7 supports the overlapping piece 11 and the bottom plate 4 which is not connected via the slidable connecting portion. That is, the bottom plate 4 that overlaps the overlapping piece 11 in the state of being assembled in a box shape is supported by the adjacent bottom plates 4, so that the load supporting force is further increased and the tip is further bent downward. Can be prevented.

  Further, a support piece 7a is provided at the tip of the bottom piece 4 slidably connected to the overlapping piece 11, and a support portion that supports the lower surface of the support piece 7a in a state of being assembled in a box shape on another adjacent bottom piece 4. It is preferable to provide the support means 7 by providing the support piece 7a and the support portion 7b.

  By adopting such a configuration, the load from above can be smoothly supported by the support portion 7b of the other bottom piece 4 adjacent from the lower surface of the supported piece 7a and stably supported.

  In addition, the overlapping piece 11 and the bottom piece 4 that are slidably connected overlap each other so that the overlapping piece 11 is on the top and the bottom piece 4 is on the bottom, and the bottom piece is slidably connected to the overlapping piece 11. 4 and a support piece 7b that supports the lower surface of the supported piece 7a in a state of being assembled in a box shape and is connected to the overlapping piece 11 via the inclined hinge part 9 4, the support piece 7 a and the support portion 7 b constitute the support means 7, and the support piece 7 a is folded into a substantially parallelogram shape. It is preferable to project beyond the extension line.

  By setting it as such a structure, when assembling into a box shape from a folded state, the lower surface of the to-be-supported piece 7a can be reliably supported by the support part 7b.

  As described above, the present invention comprises the four bottom pieces while automatically rotating the four bottom pieces only by making the rectangular tubular side wall constituting portion comprising the four side plates a rectangular shape or a square shape in plan view. By automatically and smoothly forming the bottom of the box with the bottom plate component, or by folding the square cylindrical side wall component consisting of four side plates into a substantially parallelogram, each bottom piece is automatically It can be folded smoothly along the inner surface of the side plate, and the tip of the bottom piece that overlaps the overlapping piece and is slidably connected to the overlapping piece is prevented from bending downward. It is possible to prevent damage to the connecting part that is slidably connected, and it is possible to increase the supporting force of the load from above, and because it is made of synthetic resin, it is strong, durable, and difficult to stain, Reusable as many times as possible It can be can be achieved economical and resource saving.

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

  As shown in FIG. 1, the synthetic resin folding box 13 of the present invention comprises at least a square tubular side wall constituting portion 3 made of synthetic resin and a bottom plate constituting portion 6 made of synthetic resin.

  As shown in FIGS. 1 to 5, the rectangular tubular side wall constituting portion 3 is formed by connecting adjacent side end portions of the four side plates 1 facing each other in the front, rear, left, and right directions by a side plate connecting hinge portion 2 so as to be foldable. This rectangular tube-shaped side wall constituting portion 3 is rectangular or square in plan view when assembled in a box shape, and when folded, as shown in FIG. 11, the corners of a pair of diagonal portions are acute angles. And it is comprised so that it can fold flatly as shown in FIG. 10 through folding into the substantially parallelogram shape so that the corner part of another pair of diagonal part may become an obtuse angle. 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. 1 and 5, the bottom piece 4 is continuously extended from the lower sides of the four side plates 1 on the front, rear, left, and right sides through the bottom piece connecting hinge portions 5, respectively. 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. 10, 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. 3, one of the two side plates 1 (1a, 1b) adjacent to both sides in a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. A columnar protrusion that overlaps with the side plate 1 and forms a marginal absorption portion 8 is formed on the inner surface side of the end of the side plate 1a (the end on the corner side that is folded to have an acute angle). It stands up along the direction.

  The overlap margin absorbing portion 8 is set to a length corresponding to the overlap 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. .

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

  Then, as shown in FIG. 13, the overlapping piece 11 is slidably coupled to the bottom piece 4 (hereinafter referred to as the bottom piece 4b) that is connected 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. Accordingly, the bottom pieces 4a and 4b adjacent to both sides in a pair of diagonal portions that are folded so as to have an acute angle when folded into a substantially parallelogram shape are assembled into a box shape from the folded state or the folded state. When folded from the box-shaped state, the connected state is maintained while sliding at the joint portion between the overlapping piece 11 and the bottom piece 4a.

  In addition, the bottom pieces 4 (bottom pieces 4a and 4b) adjacent to both sides in a pair of diagonal portions 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 free from each other. It has become a relationship.

  Here, there is provided support means 7 for supporting the tip of the bottom piece 4b, which is slidably coupled to the overlapping piece 11 in the state of being assembled in a box shape, away from the bottom piece connecting hinge part 5 to another adjacent bottom piece 4. Yes, in the embodiment shown on the attached surface, a support piece 7b for providing a supported piece 7a parallel to the bottom piece 4b at the tip of the bottom piece 4b and supporting the lower surface of the supported piece 7a on another adjacent bottom piece 4a. The support means 7 is comprised by the to-be-supported piece 7a and the support part 7b.

  In the embodiment shown in the accompanying drawings, as shown in FIGS. 2 and 3, a lid piece 15 is foldably extended from the upper side of one or more side plates 1 via a lid connecting hinge portion 10. The lid piece 15 may not be provided.

  In the embodiment shown in the accompanying drawings, the synthetic resin folding box 13 having the above-described configuration is formed by combining and combining two half-body boxes 12 as shown in FIGS. 14 and 15 formed by synthetic resin integral molding. It is.

  As shown in the developed views of FIGS. 14 and 15, the box half body 12 connects 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). Then, a columnar projecting portion that becomes an overlap absorbing portion 8 is projected along the side end of the side plate 1a toward the inner surface side of the side plate that is not connected by the side plate connecting hinge portion 2a of one side plate 1a. Further, another side plate connecting hinge portion 2 (hereinafter referred to as a side plate connecting hinge portion 2b) is provided at the side end of the other side plate 1b not connected by the side plate connecting hinge portion 2a, and the side plate connecting hinge portion 2b. A connecting portion 18 is provided at the front end of each of the two side plates 1a and 1b, and bottom pieces 4a and 4b are extended from the lower sides of the adjacent side plates 1a and 1b via the bottom piece connecting hinges 5 respectively. The other bottom piece 4b adjacent to one bottom piece 4a, Constructed by connecting overlapping pieces 11 through an inclined hinge portion 9 inclined at an acute angle (45 ° in the embodiment) with respect to a bottom piece connecting hinge portion 5 that continuously extends the bottom piece 4a to the opposite side end. It is.

  A supported piece 7a (hereinafter referred to as a supported part 7a1) is projected in parallel with the bottom piece 4b on one side of the tip part of the bottom piece 4b away from the bottom piece connecting hinge part 5, and the bottom piece is provided on the other side of the tip part. A supported piece 7a (hereinafter referred to as a supported portion 7a2) projects in parallel with 4b. In addition, one side edge portion of the bottom piece 4a and one side edge portion of the overlapping piece 11 opposed to the bottom piece 4a are connected by the inclined hinge portion 9. The entire length of the opposite side edge portions is connected by the inclined hinge portion 9. Rather than being connected, a part near the end of one side edge of the bottom piece 4a away from the bottom piece connecting hinge part 5 and a part near the end of one side edge of the overlapping piece 11 facing this part Is a portion that is not connected by the inclined hinge portion 9. Of the opposing side edge portions, the portions not connected by the inclined hinge portion 9 are opposed to each other via a contact or a small gap on the extension line of the folding center line of the inclined hinge portion. Then, a support portion 7b (hereinafter referred to as a support portion 7b1 on the upper surface side) is provided on the upper surface side of the end portion away from the bottom piece connecting hinge portion 5 at one side edge of the bottom piece 4a. A support portion 7b (hereinafter referred to as a support portion 7b2 on the lower surface side) is provided on the lower surface side of the other side edge portion of the bottom piece 4a (the other side edge portion not connected by the inclined hinge portion 9).

  In the accompanying drawings, a lid piece 15 is continuously provided on the upper side of the side plate 1 via a lid connecting hinge portion 10.

  The box half body 12 having the above configuration is integrally formed by two-color injection molding of a synthetic resin, and the side plate 1, the bottom piece 4, the overlapping piece 11, the lid piece 15, the supported piece 7a, the support portion 7b are, for example, Molded with hard resin such as PP (polypropylene), PE (polyethylene), HDPE (high density polyethylene), PC (polycarbonate), PVC (vinyl chloride resin), ABS resin, etc. Also, side plate 1, side plate 1, 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 foldably integrated by side plate connecting hinge portions 2a and 2b, a bottom piece connecting hinge portion 5, an inclined hinge portion 9 and a lid connecting hinge portion 10, respectively. The side plate connecting hinges 2a and 2b, the bottom piece connecting hinge 5, the inclined hinge 9 and the lid connecting hinge 10 are partly or entirely made of, for example, TPE (elastomer), DPE (low density polyethylene), are molded by a soft resin such as EVA (ethylene-vinyl acetate).

  Using the two box halves 12 integrally formed of synthetic resin as described above, the other box half 12 is placed on the overlap margin absorbing portion 8 provided at the side end of one side plate 1a of the one box half 12. The connecting portion 18 provided at the tip of the other side plate connecting hinge portion 2b provided at the side end of the other side plate 1b of the other side plate 1b is overlapped and connected by the connecting means 16, and the overlap of the other box half 12 is absorbed similarly. The 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 portion 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 13, the pair of diagonal parts that are folded so as to form an acute angle when folded into a substantially parallelogram shape on both sides. Adjacent both bottom pieces 4a and 4b are slidably connected via an inclined hinge portion 9 and an overlapping piece 11. Further, the bottom plates 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 13, the pair of diagonal portions that are folded so as to have an obtuse angle when folded into a substantially parallelogram shape are formed on both sides. The adjacent bottom pieces 4 are not connected to each other. 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 13 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 overlap allowance absorbing portion 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 overlap allowance absorbing portion 8 made of hard synthetic resin is used. The connecting portion 18 that is overlapped with each other may be made of a soft synthetic resin in the same manner as the soft synthetic resin side plate connecting hinge portion 2b, but the distal end portion of the soft synthetic resin side plate connecting hinge portion 2b. May be provided with a hard synthetic resin connecting portion 18 (in the embodiment shown in the accompanying drawings, a hard synthetic resin connecting portion 18 is provided, and the inner surface of the soft part at the tip of the hinge portion 2b for connecting the side plate of soft synthetic resin) Or, an example in which the connecting portion 18 made of hard synthetic resin 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 connection by engagement, for example, as shown in FIGS. 14 and 15, an engagement portion 16a is provided in the overlap allowance absorption portion 8, and an engaged portion 16b is provided on the side plate connection hinge portion 2b (connection portion 18) side. The engaging portion 16a may be engaged 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. 13, 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 13 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 where the synthetic resin folding box 13 is assembled in the box shape as described above, the lower surface of the supported piece 7a1 on one side of the tip of the bottom piece 4b slidably connected to the overlapping piece 11 has a substantially parallelogram shape. Is overlapped and supported on the support portion 7b1 on the upper surface side of the adjacent bottom piece 4a at the corner portion that is folded so as to have an acute angle when folded to the other side, and is supported on the other side of the tip portion of the bottom piece 4b. A hole in which the side of the adjacent bottom piece 4a is opened at the corner of the side where the piece 7a2 is folded so as to have an obtuse angle when folded into a substantially parallelogram shape, or a bag-like lower side support portion in which the side is opened The lower surface of the supported piece 7a2 is supported by being inserted into 7b2.

  In the state assembled in the box shape as described above, various stored items are stored in the folding box 13 made of synthetic resin, and the upper opening is closed as shown in FIG. Thereafter, in the same manner as in a normal bottom lock type cardboard box, an adhesive tape is applied so that the lid piece 15 does not open, and further, an adhesive tape is also applied to the bottom piece 4 side as necessary.

  Here, as described above, the lower surface of the supported piece 7a provided at the distal end of the bottom piece 4b that is slidably coupled to the overlapping piece 11 in the state of being assembled in the box shape is provided adjacent to the bottom piece 4a. Since it is configured to be supported by the support portion 7b provided on the other bottom piece 4a, the tip of the bottom piece 4 that overlaps the overlapping piece 11 and is slidably connected to the overlapping piece 11 is bent downward. Can be supported by another bottom piece 4 so as not to bend. As a result, the supporting force of the load by the bottom piece 4 can be increased, and it is possible to prevent an undue force from acting on the slidably connected portion with the overlapping piece 11 to break the connected portion. Assembling operation can be performed smoothly, and since the tip of the bottom piece 4 does not bend downward, there is no risk of being caught by other objects, and handling becomes easy.

  When taking out the stored item, the stored item can be taken out by peeling the adhesive tape and rotating and opening the lid piece 15.

  At the time of non-use not containing a storage item, the rectangular tubular side wall constituting portion 3 composed of the four side plates 1 as shown in FIGS. 1, 2, 4, and 5 is in an assembled state that is rectangular or square in plan view, As shown in FIG. 11, 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 and the side plate 1 as shown in FIG. 10. The bottom piece 4 can be folded along the inner surface, that is, in a flat state. In this case, the overlap margin between the side plate 1 facing in the folded state and the bottom piece 4 stacked along the inner surface of each side plate 1 can be absorbed by the overlap margin absorbing portion 8 and can be folded without difficulty.

  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. In one side of the bottom piece 4a which is continuous from one side plate 1a of the two side plates 1a and 1b adjacent to both sides in a pair of diagonal portions which are folded so as to have an acute angle when folded into a box shape, In an assembled state, the overlapping piece 11 protrudes through the inclined hinge portion 9 inclined at an acute angle with respect to the both side plates 1, and the overlapping piece 11 extends from the lower side of the adjacent other side plate 1 b via the bottom piece connecting hinge portion 5. Are connected to the bottom piece 4b that is continuous with each other so as to be slidable in an overlapping state, so that the rectangular tubular side wall constituting portion 3 composed of the four side plates 1 is formed into a rectangular shape or a square shape in plan view, or folded into a substantially parallelogram shape. Rolling When the overlapping piece 11 slides while keeping the overlapping state with respect to the bottom piece 4b, 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. 11 is rotated through the inclined hinge portion 9 and simultaneously, the bottom piece 4b is rotated with respect to the side plate 1b through the bottom piece connecting hinge portion 5 while sliding in an overlapping state with respect to the overlapping piece 11. A box is formed by the bottom plate constituting portion 6 comprising the four bottom pieces 4 while automatically turning the four bottom pieces 4 only by making the rectangular cylindrical side wall constituting portion 3 comprising the two side plates 1 have a rectangular or square shape in plan view. The bottom piece 4 is automatically and smoothly formed, or each bottom piece 4 is automatically fitted to each side plate 1 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 Mukoto can, can solve the problem that can not be folded in the synthetic resin folding box provided with overlapping margin absorbing portion 8 as shown in FIG. 17.

  The folding box 13 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 connecting hinge part 10 is formed of a soft synthetic resin. 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 composite When placed on a placing part such as a resin folding box 13 or the like, the hinge part made of soft synthetic resin comes into contact with the placing part and the hinge part exhibits a non-slip function. It is possible to prevent slipping and slipping, and when a shock is applied, a hinge portion made of a soft resin has a shock buffering action. 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 embodiment shown in an accompanying drawing, in the state assembled in the box shape, as shown in FIG. 4, the bottom of the folding box 13 is so that only two bottom pieces 4a can be seen when viewed from the top opening of the folding box 13. 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 portion that is folded to have an obtuse angle when folded through the bottom piece connecting hinge portion 5 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-angle trapezoidal piece portion 21 (that is, the point where the lower base of the right-angle trapezoid and the oblique side intersect) is one end of the side plate 1a from the other end of the side plate 1a (the end portion on the overlap margin absorbing portion 8 side in the embodiment). It is located on the side shifted by a predetermined dimension. 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.

  One side edge of the stepped overlapping piece 22 and one side edge of the overlapping piece 11 opposed to the stepped overlapping piece 22 are connected by the inclined hinge 9. A part of the side edge near the end away from the bottom piece connecting hinge part 5 and a part near the end of one side edge of the overlapping piece 11 facing this part are not connected by the inclined hinge part 9. The portions of the opposite side edges that are not connected by the inclined hinge portion 9 are opposed to each other via a contact or a small gap on the extension line of the folding center line of the inclined hinge portion. And the support part 7b1 of the upper surface side is provided in the upper surface side of the edge part of the one side edge part of the step-down overlapping piece part 22 near the edge part away from the bottom piece connection hinge part 5.

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

  The lower surface side of the right-angle trapezoidal piece portion 21 is divided into three parts having different levels of the lower surface. One is a portion 21 a exposed on the lower surface side in a state of being assembled in a box shape, and is at the same level as the lower surface of the stepped overlap piece 22 at a portion adjacent to the stepped overlap piece 22. The other is a part 21b in which the upper surface of the overlapping piece 11 overlaps the lower surface side in a state of being assembled in a box shape, and the lower surface of the part 21b is located above the lower surface of the part 21a. The other one is a part 21c in which the upper surface of the part that does not overlap with the overlapping piece 11 of the bottom piece 4b overlaps in the state of being assembled in a box shape, and the lower surface of this part 21c is located above the lower surface of the part 21a and It is located below the lower surface of the part 21b. In order to form the three portions having different levels as described above on the lower surface side, for example, as shown in FIG. 9, bottom ribs 28a and 28b having different hanging lengths are suspended on the lower surface of the right-angle trapezoidal piece portion 21, The part where the bottom rib 28a with the long hanging part is suspended is the part 21a exposed on the lower surface side having the lowest level in the assembled state in the box shape, and the part with the bottom rib 28b with the short hanging part is assembled into the box shape. In this state, the upper surface of the portion that does not overlap the overlapping piece 11 of the bottom piece 4b having the next lowest level is the portion 21c, and the portion where the bottom rib is not suspended or the portion where the bottom rib with the shortest hanging length is suspended is It is set as the site | part 21b where the upper surface of the duplication piece 11 overlaps with the lower surface side with the highest level in the state assembled in the box shape. FIG. 9 shows the positional relationship of the lower ends of the three portions 21 a, 21 b, 21 c that are three steps on the lower surface of the right-angle trapezoidal piece portion 21.

  The level difference between the lower end of the part 21a and the lower end of the part 21c is the same as or substantially equal to the thickness of the bottom piece 4b, and the level difference between the lower end of the part 21a and the lower end of the part 21b is the same as the thickness of the bottom piece 4b. It is the same as or substantially equal to the sum of the thicknesses. Further, the level difference between the lower end of the part 21 a and the lower end of the part 21 b is the same as or substantially equal to the thickness of the stepped overlap piece 22. At the boundary between the part 21a and the part 21b, a side opening or a bag-like lower side support part 7b2 having an open side is formed (in the embodiment shown in FIG. 8, the lower side support part). 7b2 has a bag shape opened to the side).

  Supported pieces 7a and 7b protrude from both ends of the tip of the bottom piece 4b. Each of the supported pieces 7a and 7b has a triangular projecting portion, and the lower surfaces of the supported pieces 7a and 7b are shifted above the lower surface of the bottom piece 4b.

  Then, the folding box 13 is assembled into a box shape, and the oblique sides of the two right-angle trapezoidal pieces 21 are brought into contact 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. As shown in FIG. 6, in a state in which the bottom surface when viewed from the upper opening is formed, a stepped overlapping piece of another bottom piece 4a opposed to the bottom piece 4a is formed on the lower surface portion 21b of the right-angled trapezoidal piece portion 21. The part 22, the inclined hinge part 9, and the overlapping piece 11 fit into each other and overlap the part 21 b on the lower surface of the right-angled trapezoidal piece part 21. Here, one side half of the bottom piece 4b overlaps the lower surface side of the overlapping piece 11, and the lower surface of the bottom piece 4b is flush with the lower surface of the stepped overlapping piece portion 22 of the bottom piece 4a (that is, at the same level). The supported piece 7a1 provided on one side of the tip end of 4b overlaps the support part 7b1 on the upper surface of the overlapping piece part 22, and the lower surface of the supported piece 7a is supported by the support part 7b1 on the upper surface of the overlapping piece part 22. The In this case, in a state of being folded into a substantially parallelogram shape, as shown in FIG. 12, the supported piece 7a is folded and protrudes beyond the extension line of the folding center line of the inclined hinge portion 9 as shown in FIG. When assembling into a box shape, the bottom surface of the supported piece 7a is assembled in a box shape with the lower surface of the supported piece 7a always facing the upper surface side of the stepped overlapping piece portion 22, and the lower surface of the supported piece 7a is It is automatically and reliably overlapped and supported on the support portion 7b provided on the upper surface portion of the stepped overlapping piece portion 22 (see FIG. 6A).

  Further, as shown in FIG. 8, the upper surface of one half portion that does not overlap the overlapping piece 11 of the bottom piece 4b overlaps the portion 21c on the lower surface of the right-angled trapezoidal piece portion 21, and overlaps the overlapping piece 11 of the bottom piece 4b. The bottom surface of the lower half of the bottom piece 4a is flush with the exposed portion 21a of the bottom surface 4a of the bottom piece 4a (that is, at the same level), and the supported piece 7a2 provided on the other side of the tip of the bottom piece 4b , A hole or a side opening provided at the boundary portion between the lower surface portion 21a and the portion 21c of the right-angle trapezoidal piece portion 21 is inserted into a bag-like lower surface side support portion 7b2 that is open to the side, and the supported piece 7a2 Is supported by the lower surface portion of the support portion 7b2 on the lower surface side of the hole or bag shape (see FIG. 8A).

  In this way, with the folding box 13 assembled in a box shape, the tip of the bottom piece 4b slidably coupled by the slide coupling means 17 in the state of overlapping the lower surface side of the overlapping piece 11 is the supported piece 7a and the supporting part 7b. The support means 7 is configured to support each bottom piece 4a adjacent to both sides so that the tip of the bottom piece 4b does not bend downward even when a load is applied in the assembled state, A large load acts on the means 17 portion so that this portion is not damaged.

  Further, the upper and lower surfaces of the bottom of the box are flush with each other, and the upper surface of the bottom of the box is in contact with or in close proximity to the oblique sides of the two right-angle trapezoidal pieces 21. The bottom of the box is beautiful when viewed from the inside of the box, so that it does not get caught when a stored item is inserted, and the tip of the bottom piece 4b is bent downward. Since it does not stop, other objects are not caught on the lower surface, and handling becomes easy.

  Here, although not shown in the figure, a part of the bottom piece 4a and a part of the bottom piece 4a facing each other in the state of being assembled in a box shape overlap each other, a part of the adjacent bottom piece 4a and the bottom piece 4b. Means may be provided to prevent the bottom pieces 4a, 4a facing each other and the adjacent bottom pieces 4a, 4b from shifting in the surface direction in a portion where a part overlaps vertically. This is, for example, provided with a fitting part on one side of the overlapping bottom piece 4 and a fitting part on the other side, and when assembling and overlapping a part of the bottom piece 4 up and down, The fitting portion is fitted into the fitted portion, thereby preventing the bottom pieces 4 from being displaced in the surface direction. Since the bottom pieces 4 are prevented from shifting in the surface direction in the state of being assembled in the box shape in this way and the bottom plate constituting part 6 is held in a rectangle or a square in plan view, the lower surface of the supported piece 7a is supported by the support part 7b. It will be possible to maintain the state supported by.

  In the above embodiment, the supported piece 7a1 and the supported piece 7a2 are provided on both sides of the tip of the bottom piece 4b, and the support piece 7b1 and the support part 7b2 are provided on the bottom piece 4a. 7a1 and the supported piece 7a2 are supported by the support part 7b1 and the support part 7b2, respectively. However, the supported piece 7a1 is provided at the tip of the bottom piece 4b, and the support part 7b1 is provided at the bottom piece 4a. The support piece 7a1 may be supported by the support portion 7b1 in the assembled state. In this case, the bottom piece 4b protruding the support piece 7a1 and the bottom piece 4a provided with the support portion 7b are provided. In addition, the positional relationship between the hinge portion 9, the overlapping piece 11, and the slidable connecting portion is accurate, so that the supported piece 7a1 can be reliably supported on the supporting portion 7b1 with the accurate positional relationship.

  Further, the support piece 7a2 may be provided at the tip of the bottom piece 4b, and the support part 7b2 may be provided on the bottom piece 4a so that the support piece 7a2 is supported by the support part 7b2 in a state of being assembled in a box shape. In this case, the supported piece 7a2 can be supported on the bottom piece 4b which is not connected to the bottom piece 4b protruding from the hinge part 9, the overlapping piece 11, and the slidable connecting part. The supporting force of the load increases, and the tip can be prevented from further bending downward.

  In the embodiment shown in the accompanying 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 13 is shown. The folding box 13 made of synthetic resin may be formed by combining and joining three or more parts made of plastic. Alternatively, the entire folding box 13 may be formed of 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 a part or all of the lid connection hinge part 10 was formed with the soft synthetic resin, Side plate connecting hinge part 2, bottom piece connecting hinge part 5, inclined hinge part 9, and lid connecting hinge part 10 are side plate 1, bottom piece 4, etc. as side plate 1, bottom piece 4, thin hinge part made of the same hard synthetic resin as overlapping piece 11, etc. And may be formed integrally.

  Further, the side plate connecting hinge portion 2, the bottom piece connecting hinge portion 5, the inclined hinge portion 9, the lid 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 hinge. Part 9, lid connecting hinge part 10, etc. are formed separately without being integrally formed, and side plates 1, side plate 1 and bottom piece 4, bottom piece 4 and overlapping piece 11 are formed by connecting means via the separate hinge parts. May be connected to each other in a foldable manner. In this case, each hinge part may be made of synthetic resin or metal.

  In the case where the lid piece 15 is provided, the lid pieces 15 are flush with the side plates 1 in a state where the folding box 13 is folded and flattened. It may be folded inward so as to overlap with each other.

It is the perspective view seen from the state of the state which assembled the folding box made from the synthetic resin of this invention 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 perspective view of the folded state same as the above. 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 the XX line of FIG. 4 same as the above. (A) is sectional drawing of the Y1-Y1 line | wire of FIG. 5 same as the above, (b) is sectional drawing of the Y2-Y2 line | wire of said same. (A) is sectional drawing of the Z1-Z1 line | wire of FIG. 5 same as the above, (b) is sectional drawing of the Z2-Z2 line same as the above. It is sectional drawing which shows that the lower surface of a right-angled trapezoid piece part same as the above has three steps. (A) is sectional drawing of the folded state same as the above, (b) is an important section expanded sectional view of (a). It is the perspective view seen from the lower part which shows the state in the middle of folding same as the above. It is a perspective view which shows the state which the to-be-latched piece protrudes beyond the extension line of the folding centerline of an inclination hinge part in the folded state 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. 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. (A), (b) is explanatory drawing for demonstrating the reason why what overlapped and the bottom piece cannot fully fold in the synthetic resin conventional assembly box which provided the overlap margin absorption part same as the above. is there.

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 Support means 7a Supported piece 7b Support part 8 Overlap allowance absorption part 9 Inclined hinge part 11 Overlapping piece

Claims (5)

A pair of side plates, which are adjacent to each other in the front, rear, left and right sides, are connected in a foldable manner at the side plate connecting hinges and assembled into a box shape, and are rectangular or square in plan view. A rectangular tubular side wall constituting part that can be folded flatly after being folded into a substantially parallelogram shape so that the corners of the diagonal part become acute and the corners of the other pair of diagonal parts become obtuse, and 4 The bottom piece can be foldably extended from each lower side of each side plate via a bottom piece connecting hinge part, and the bottom piece is folded so that it overlaps the inner surface of each side plate in the folded state, and the rectangular tubular side wall component is boxed In a synthetic resin folding box comprising a bottom plate component that forms a box-shaped bottom by overlapping the bottom pieces in a state assembled in a shape,
Four side plates are flatly folded at the end of one side plate of the two side plates adjacent to both sides in a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape, and In the folded state where each bottom piece overlaps the inner surface of each side plate, an overlap margin absorbing portion corresponding to the overlap thickness is provided,
In a box shape on one side of the bottom piece that is continuous from one side plate of the two side plates adjacent to both sides in a pair of diagonal portions that are folded so as to have an acute angle when folded into the substantially parallelogram shape. In an assembled state, the overlapping piece protrudes through an inclined hinge portion inclined at an acute angle with respect to the lower side of each side plate in plan view, and the overlapping piece is protruded from the lower side of the adjacent other side plate via the bottom piece connecting hinge portion. The bottom piece of the bottom piece that is slidably connected to the overlapping bottom piece and slidably connected to the overlapping piece in the assembled state in the box shape is connected to the other bottom piece at the tip of the bottom piece connecting hinge part. A synthetic resin folding box characterized by comprising supporting means for supporting.   Adjacent to the one that is folded into an acute angle when the tip of the bottom piece that is slidably coupled to the overlapping piece in the state of being assembled in a box shape is folded away into a substantially parallelogram shape. 2. The synthetic resin folding box according to claim 1, wherein the other plastic piece is supported by a supporting means.   Adjacent one that is folded so as to have an obtuse angle when the tip of the bottom piece that is slidably coupled to the overlapping piece in the box shape is separated from the bottom piece connecting hinge part into a substantially parallelogram shape. The synthetic resin folding box according to claim 1 or 2, wherein the other bottom piece is supported by a supporting means.   A supported piece is provided at the tip of the bottom piece slidably connected to the overlapping piece, and a supporting portion is provided on the other adjacent bottom piece to support the lower surface of the supported piece in a state of being assembled in a box shape. The synthetic resin folding box according to any one of claims 1 to 3, wherein the supporting means is constituted by a piece and a supporting portion. The overlapping piece and the bottom piece, which are slidably connected, are overlapped so that the overlapping piece is at the top and the bottom piece is at the bottom in the state of being assembled in a box shape, and the supported piece is attached to the tip of the bottom piece slidably connected to the overlapping piece And a support portion that supports the lower surface of the supported piece in a state of being assembled in a box shape is provided on an adjacent bottom piece connected via an overlapping piece and an inclined hinge portion, and the above-mentioned supported piece and the support portion 3. The support means is configured to be folded in a substantially parallelogram shape, and the supported piece is projected beyond the extension line of the folding center line of the inclined hinge portion in the folded state. Folding box made of synthetic resin.

Images