JP2008024330A - Synthetic resin-made folding box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made folding box in which a bottom piece is not turned upwardly even if a force is applied to both side plates from the outer side to the inner side when the box is held by hands with no content being put therein or a light content is put therein. <P>SOLUTION: A locking part 7a is provided on a side edge adjacent via a right angle to a side edge connected to a bottom piece connection hinge part 5 out of side edges of a bottom piece 4. An uplift-preventive projection 7b is provided on a lower end of an inner face of a side plate 1 adjacent to the side plate 1 connected to the bottom piece 4 via a right angle via the bottom piece connection hinge part 5 in an assembled state in a box shape. In the assembled state in the box shape, the locking part 7a is locked to a lower face side of the uplift-preventive projection 7b hopping thereover. <P>COPYRIGHT: (C)2008,JPO&INPIT

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, the side end portions of the four side plates facing each other in the front, rear, left and right sides are connected to each other in a foldable manner at the side plate connecting hinges and assembled into a box shape. A rectangular tubular side wall constituting part that can be folded flatly by folding into a substantially parallelogram shape so that the corners of a pair of diagonal parts are acute and the corners of the other pair of diagonal parts are obtuse. The bottom piece is continuously extended from each lower side of the four side plates via the bottom piece connecting hinge portion, and the bottom piece is folded so that the bottom piece overlaps the inner surface of each side plate in the folded state. Patent Document 1 discloses a synthetic resin folding box provided with a bottom plate component that forms a box-shaped bottom by overlapping bottom pieces in a state of being assembled into a box shape.

In the conventional example shown in Patent Document 1, when a folding box assembled in a box shape is held with both hands, both hands are applied to a corner portion formed by a pair of side plates opposed to the box and opposite opposite ends of the bottom plate constituting portion. It is common to hold a pair of side plates facing each other with both arms. In this way, when holding the folding box assembled in a box shape with both hands, if you hold the assembly box with no contents inside or stored light contents, it will be pushed by both arms and the above mentioned A force is applied to the pair of side plates from the outside to the inside, and the folding box tries to be folded and the bottom piece tries to float up so as to rotate upward about the bottom piece connecting hinge part. However, if the contents are contained, the contents may be sandwiched between the bottom pieces or, depending on the case, between the bottom pieces. There is a problem that contents are dropped from.
JP 2006-160344 A

  The present invention was invented in view of the above-described conventional problems, and can be held in a box shape with a simple configuration in a state of being assembled into a box shape. To provide a synthetic resin folding box that can prevent the bottom piece from rotating upward even when force is applied from the outside to the inside when facing with both hands when holding with both hands It is to be an issue.

  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 A folding box 13 made of synthetic resin and provided with a locking portion 7a on a side edge adjacent to the side edge of the bottom piece 4 through an angle perpendicular to the side edge connected to the bottom piece connecting hinge part 5. In addition, a lifting prevention protrusion 7b is provided on the lower end of the inner surface of the adjacent side plate 1 at an angle perpendicular to the side plate 1 connected to the bottom piece 4 via the bottom piece connecting hinge portion 5 in the state of being assembled in a box shape. In the assembled state, the locking portion 7a gets over the lifting prevention protrusion 7b and is locked to the lower surface side of the lifting prevention protrusion 7b.

  By adopting such a configuration, it is possible to obtain a bottom lock type synthetic resin folding box 13 that can be folded flat or assembled into a box shape like a cardboard folding box. Strong, durable, difficult to clean, can be cleaned many times and can be reused any number of times to save money and save resources. A locking portion 7a is provided on the side edge adjacent to the side edge connected to the side edge 5 at a right angle, and is perpendicular to the side plate 1 connected to the bottom piece 4 via the bottom piece connection hinge part 5 in a box-like assembled state. An anti-lifting projection 7b is provided at the lower end of the inner surface of the adjacent side plate 1 through an angle, and the locking portion 7a gets over the anti-raising projection 7b in the state of being assembled in a box shape and is engaged with the lower surface side of the anti-raising projection 7b Stop Therefore, when holding the folding box 13 assembled into a box shape with both hands in a state in which no stored items are contained or in a state in which light contents are stored, the pair of side plates 1 facing each other from the outside When the bottom piece 4 tries to rotate upward about the bottom piece connecting hinge part 5 by the force acting from the outside to the inside, the locking part 7a is lifted up and the protrusion 7b is raised. It can be prevented by locking to the lower surface side. In this case, a force applied to the side plate 1 from the outside to the inside acts as a force in a direction in which the anti-protrusion protrusion 7b does not come off the locking portion 7a. It is possible to further prevent the bottom piece 4 from being lifted.

  In addition, the side end portions of the four side plates 1 that face each other in the front, rear, left, and right sides are connected to each other so as to be foldable by the side plate connecting hinge portion 2 and assembled into a box shape. Square tubular side wall structure that can be folded flatly by folding into a substantially parallelogram shape so that the corners of a pair of diagonal parts become acute angles and the corners of the other pair of diagonal parts become obtuse angles upon folding The bottom piece 4 is foldably extended from the lower portions of the part 3 and the four side plates 1 through the bottom piece connecting hinges 5 and folded so that each bottom piece 4 overlaps the inner surface of each side plate 1 in the folded state. And a bottom plate constituent part 6 in which the bottom pieces 4 overlap with each other to form a box-shaped bottom in a state where the rectangular tubular side wall constituent part 3 is assembled in a box shape, , Approximately parallel four above Four side plates 1 are flatly folded at the ends of one side plate 1 of 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 a shape, and In the folded state in which the bottom piece 4 overlaps the inner surface of each side plate 1, an overlap margin absorbing portion 8 corresponding to the overlap thickness is provided, and between the side end surface of the overlap margin absorbing portion 8 and the side end surface of the adjacent side plate 1, When the side plate 1 adjacent to the overlap margin absorbing portion 8 is folded, the side end surface of the overlap margin absorbing portion 8 and the side end surface of the adjacent side plate 1 are overlapped via a small gap 7c for avoiding interference with each other. The outer surface side of the side absorption portion 8 and the outer surface side of the adjacent side plate 1 are connected by the side plate connecting hinge portion 2, and the side piece of the bottom piece 4 is connected to the bottom piece connecting hinge portion 5 through an angle perpendicular to the side edge. A locking projection 7d is provided on the adjacent side edge and assembled in a box shape. In a state in which the bottom pieces 4 and the perpendicular orientation relative to the side plate 1, the locking protrusion 7d may be one which is characterized by comprising engaged detachably in the small gap 7c.

  By adopting such a configuration, it can be folded flat as in the case of a cardboard box or assembled into a box shape, and opposed to each other in a folded state even though the folding box 13 is made of synthetic resin. A folding box 13 made of a bottom-locking synthetic resin that can be folded without difficulty by absorbing the overlapping margin between the side plate 1 to be performed and the bottom piece 4 overlapped along the inner surface of each side plate 1 by the overlapping margin absorbing portion 8; It is strong, durable, resistant to dirt, and can be cleaned so that it can be reused over and over to save money and save resources. The side end surface of the side plate 1 adjacent to the side end surface of the overlap allowance absorbing portion 8 when the side plate 1 adjacent to the overlap allowance absorbing portion 8 is folded between the side end surface of the side plate 1 and the side end surface of the adjacent side plate 1. Interfere with each other Is connected to the outer surface side of the adjacent side plate 1 by the side plate connecting hinge portion 2 and the bottom piece connecting hinge portion 5 out of the side edges of the bottom piece 4. A locking projection 7d is provided on an adjacent side edge through an angle perpendicular to the connected side edge, and the locking projection 7d is mounted on the side plate 1 in a state in which the bottom piece 4 is placed at a right angle with respect to the side plate 1. Since it is detachably locked in the gap 7c, the folding box 13 assembled in a box shape is opposed to when it is held with both hands in a state in which no stored items are contained or light contents are stored. A force is applied to the pair of side plates 1 from the outside to the inside, and the bottom piece 4 tries to rotate upward about the bottom piece connecting hinge portion 5 by the force acting from the outside to the inside. The locking projection 7d is locked in the small gap 7c. In this case, a force applied to the side plate 1 from the outside to the inside acts as a force in a direction in which the locking projection 7d does not come off from the small gap 7c, and the bottom piece 4 is further lifted. Can be prevented. Moreover, the small gap 7c is for avoiding interference between the side end face of the overlap allowance absorbing portion 8 and the side end face of the adjacent side plate 1. The small gap 7c is used to engage the locking projection 7d. There is no need to provide a special locked portion that can also serve as a locking member and locks the locking projection 7d.

  As described above, when the folding box assembled in a box shape is held with both hands in a state in which no stored item is contained or a light content is stored, the bottom piece is connected to the bottom piece. It is possible to prevent the locking part from rotating upward about the hinge part by locking the locking part to the lower surface side of the anti-lifting projection. In this case, the side plate is further directed from the outside to the inside. The applied force acts as a force in the direction in which the anti-lifting protrusion does not come off the locking part, and it is possible to prevent the bottom piece from rising more reliably. As a result, the folding box made of synthetic resin was assembled in a box shape. It can secure the rigidity in the state and can stably secure the box shape, and when the contents are contained, the contents are sandwiched between the bottom pieces, or the contents fall off between the bottom pieces. Can so that does not occur.

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

  As shown in FIG. 3, 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. 2 to 6, 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 in a side plate connecting hinge portion 2 so as to be foldable. This rectangular tubular 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. 13, 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. 12 after folding in 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 FIG. 3 and FIG. 6, 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 hinges 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. 12, 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. 4, 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. The side plate 1a (long side side plate 1a) has a columnar shape that overlaps with the side plate 1 to form a marginal absorption portion 8 on the inner surface side of the end portion (the end portion on the corner portion that is folded so as to have an acute angle). The protruding portion is erected along the height direction of the side plate 1.

  That is, a columnar protrusion that becomes the overlap allowance absorbing portion 8 protrudes from one end of the side plate 1a on the long side toward the side plate 1b on the short side, and the short side adjacent to the side end face of the overlap allowance absorbing portion 8 When the side plate 1b on the short side adjacent to the overlap margin absorbing portion 8 is folded between the side end surface of the side margin plate 1b, the side plate 1b on the short side adjacent to the side end surface of the overlap margin absorbing portion 8 is folded. The outer surface side of the overlap allowance absorbing portion 8 and the outer surface side of the adjacent side plate 1 are connected by the side plate connecting hinge portion 2 through a small gap 7c for avoiding mutual interference with the side end surfaces of the side plates (FIG. 1). FIG. 5).

  In the vicinity of the small gap 7c at the lower end of the inner surface of the side plate 1b on the short side, as shown in FIGS. 1, 5, and 8A, a lifting prevention projection 7b is projected, and the lifting prevention projection 7b. A guide inclined rib 29 is provided on the upper surface of the side plate 1b.

  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. 15, the overlapping piece 11 is slidably coupled to the bottom piece 4 (hereinafter referred to as the bottom piece 4b) which is connected from the lower side of the other 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, the bottom piece 4a connected to the lower end of the side plate 1a on the long side via the bottom piece connecting hinge portion 5 has a right trapezoidal shape as shown in FIG. 5, and the bottom piece connection among the side edges of the bottom piece 4a. A locking portion 7a is provided in the vicinity of the front end portion of the side edge adjacent to the side edge connected to the hinge portion 5 at an angle perpendicular to the side edge (the front end portion in the direction away from the bottom piece connecting hinge portion 5) (FIG. 1, FIG. 8 (a), FIG. 16 and FIG. 17), this locking portion 7a is a lifting prevention protrusion provided at the lower end of the inner surface of the side plate 1b on the short side in the state where the folding box 13 is assembled in a box shape. The bottom piece 4a is locked to the lower surface side of 7b to prevent the bottom piece 4a from floating upward. As this latching | locking part 7a, a part of said edge part is good also as the latching | locking part 7a, and it is good also as a latching protrusion 7a which protrudes a protrusion piece to the outer side from an edge.

  Further, a locking projection 7d is provided on the edge of the bottom piece 4a where the locking portion 7a is provided, and protrudes outward from the portion where the locking portion 7a is provided (FIGS. 1 and FIG. 1). 5, FIG. 8 (b), FIG. 16 and FIG. 17), this locking projection 7d is a short side adjacent to the side end face of the overlap allowance absorbing portion 8 in the state where the folding box 13 is assembled in a box shape. The bottom piece 4a is prevented from being lifted upward by being fitted and locked in a small gap 7c for preventing interference formed between the side plate 1b and the side end surface of the side plate 1b.

  In the embodiment shown in the accompanying drawings, as shown in FIGS. 2 and 4, 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 two box halves 12 as shown in FIGS. 16 and 17 formed by synthetic resin integral molding. It is.

  As shown in the developed views of FIGS. 16 and 17, the box half body 12 connects side ends of a pair of adjacent side plates 1 a and 1 b with side plate connecting hinge portions 2 (hereinafter referred to as side plate connecting hinge portions 2 a). Then, a columnar protruding portion serving as an allowance absorption portion 8 is formed on the side plate 1a side toward the inner surface at the side end of one side plate 1a (long side plate 1a) that is not connected by the side plate connecting hinge 2a. Furthermore, another side plate connecting hinge portion 2 (hereinafter referred to as a side plate connecting hinge) is provided on the side end of the other side plate 1b (short side plate 1b) that is not connected by the side plate connecting hinge portion 2a. 2), the connecting portion 18 is provided at the tip of the side plate connecting hinge portion 2b, and the bottom plate connecting hinge portion 5 from the lower sides of the adjacent pair of side plates 1a, 1b. The bottom pieces 4a and 4b are continuously provided, and the adjacent bottom pieces 4a and 4b. One of the bottom pieces 4a (the bottom piece 4a continuous from the side plate 1a on the long side) has an acute angle with respect to the bottom piece connecting hinge portion 5 that is connected to the opposite side end of the other bottom piece 4b. The overlapping piece 11 is continuously provided through the inclined hinge portion 9 inclined at 45 ° in the embodiment.

  In the vicinity of the side plate connecting hinge portion 2b at the lower end of the inner surface of the side plate 1b on the short side side, as shown in FIG.

  Further, a locking portion 7a is provided in the vicinity of the tip of the side edge adjacent to the side edge of the side plate 1a having the right trapezoidal shape through an angle perpendicular to the side edge connected to the bottom piece connecting hinge portion 5. A locking projection 7d is further provided on the edge of the edge where the stopper 7a is provided.

  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 12 having the above structure 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 locking portion 7a, the lifting prevention projection 7b, the locking The protrusion 7d is formed of a hard resin such as PP (polypropylene), PE (polyethylene), HDPE (high density polyethylene), PC (polycarbonate), PVC (vinyl chloride resin), ABS resin, etc. 1 and side plate 1, side plate 1 and bottom piece 4, bottom piece 4 and overlapping piece 11, side plate 1 and lid piece 15 are side plate connecting hinge portions 2a and 2b, bottom piece connecting hinge portion 5, inclined hinge portion 9 and lid connecting hinge portion, respectively. 10, the side plate connecting hinge portions 2 a and 2 b, the bottom piece connecting hinge portion 5, the inclined hinge portion 9, and a part or all of the lid connecting hinge portion 10 are, for example, PE (elastomer), LDPE (low density polyethylene), it is 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. In this case, when the side plate 1 adjacent to the overlap margin absorbing portion 8 is folded between the side end surface of the overlap margin absorbing portion 8 and the side end surface of the adjacent side plate 1, Side plate connecting hinge portions made of soft synthetic resin between the outer surface side of the overlap margin absorbing portion 8 and the outer surface side of the adjacent side plate 1 through a small gap 7c for avoiding interference between the side end surfaces of the adjacent side plates 1 Connect with two.

  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. 16 and 17, an engagement portion 16 a is provided in the overlap allowance absorption portion 8 and an engaged portion 16 b is provided on the side plate connection hinge portion 2 b (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. 15, 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 present application, the bottom of the folding box 13 is seen from the top opening of the folding box 13 as shown in FIG. It is configured so that only can be seen.

  That is, the bottom piece 4a that is connected to the lower side of one side plate 1a (long side side plate 1a) among the side plates 1a and 1b on both sides of the corner that is folded so as to be obtuse when folded. As shown in FIGS. 16 and 17, it is composed of a right-angled trapezoidal piece part 21 having a right-angled trapezoidal shape that continues along the bottom piece connecting hinge part 5 and a stepped overlapping piece part 22 having a substantially parallelogram shape. is there.

  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-angle 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.

  The one side edge of the stepped overlapping piece 22 and the one side edge of the overlapping piece 11 opposed to the stepped overlapping piece 22 are connected by the inclined hinge 9, but the bottom piece of the one side edge of the stepped overlapping piece 22 A part of the vicinity of the end away from the connection hinge part 5 and a part of the vicinity of the end of one side edge of the overlapping piece 11 facing this part are not connected by the inclined hinge part 9. Of the opposing side edge portions, the portions 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 9.

  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. 11, bottom ribs 28 a and 28 b 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. 11 shows the positional relationship of the lower ends of the three portions 21a, 21b, and 21c 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.

  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. 9, in a state where the bottom surface when viewed from the upper opening is formed, a stepped overlapping piece of another bottom piece 4a opposite to the bottom piece 4a is formed on the lower surface portion 21b of one 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-angle 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).

  Further, as shown in FIG. 10, the upper surface of one half portion that does not overlap the overlapping piece 11 of the bottom piece 4b overlaps the portion 21c of the lower surface of the right-angle trapezoidal piece portion 21, and overlaps the overlapping piece 11 of the bottom piece 4b. The lower surface of the half portion not present is flush with the exposed portion 21a of the lower surface of the right-angle trapezoidal piece portion 21 of the bottom piece 4a (that is, at the same level).

  In a state where the folding box 13 is assembled in the box shape in this way, only the two bottom pieces 4a can be seen at the bottom of the folding box 13 as seen from the upper opening of the folding box 13 as shown in FIG.

  In this case, as shown in FIGS. 1, 5, and 8, the locking portion 7a provided on the bottom piece 4a gets over the lifting prevention projection 7b and is locked to the lower surface side of the lifting prevention projection 7b. 7d is fitted into the small gap 7c between the side end surface of the overlap margin absorbing portion 8 and the side end surface of the adjacent side plate 1b on the short side and is locked.

  In this way, the latching portion 7a is latched to the lower surface side of the lifting prevention projection 7b, and the latching projection 7d fits into the small gap 7c and latches, so that the folding box 13 assembled in a box shape can be obtained. When it is held with both hands in a state where no stored item is contained or a light content is stored, a force is applied from the outside to the inside on the pair of opposing side plates 1a on the short side. However, the force acting from the outside to the inside (indicated by F in FIG. 1) causes the bottom piece 4 to turn upward as indicated by the arrow a in FIG. Can be prevented. As a result, it is possible to secure rigidity in the state in which the folding box 13 made of synthetic resin is assembled in a box shape, to stably secure the box shape, and when the contents are contained, 4 and the contents are not dropped from between the bottom pieces 4.

  Here, both of the two box halves 12 are integrally formed to have a locking portion 7a, a lifting prevention projection 7b, a locking projection 7d, and a small gap 7c by two-color injection molding of synthetic resin. In addition, the locking portions 7a and the locking projections 7d provided in the box halves 12 are respectively locked to the lifting prevention protrusions 7b and the small gaps 7c provided in the same box half 12. Therefore, despite the fact that the two box halves 12 are combined and joined to form the assembly box 13, the positional relationship between the locking portion 7a and the lifting prevention protrusion 7b in one box half 12 Therefore, even if an assembly error occurs when the two box halves 12 are combined and combined, the error can be reduced. Regardless of floating part 7a Engagement of the preventing projection 7b rising, the engagement between the locking projection 7d and the small gap 7c can reliably.

  Further, if the side plate connecting hinge portion 2 is made of soft synthetic resin, the bottom of the small gap 7c is constituted by the side plate connecting hinge portion 2 made of soft synthetic resin, so that the width of the small gap 7c is somewhat widened. Even if a small dimensional error occurs due to the position and width of the small gap 7c and the position of the locking protrusion 7d, the dimensional error is absorbed and the locking protrusion 7d is securely inserted. It can be locked in the small gap 7c.

  In the embodiment shown in the attached drawings, the bottom piece 4a is prevented from being lifted by both the locking of the locking portion 7a and the lifting prevention protrusion 7b and the locking protrusion 7d and the small gap 7c. Only one of the locking by the locking portion 7a and the lifting prevention protrusion 7b or the locking protrusion 7d and the small gap 7c may be locked.

  In the embodiment shown in the attached drawings, the tip of the bottom piece 4b that is slidably coupled to the overlapping piece 11 in the state of being assembled in a box shape is separated from the bottom piece connecting hinge portion 5 to the other bottom piece 4 adjacent thereto. In the embodiment shown on the attached surface, a supporting means 14 to be supported is provided, and a supported piece 14a parallel to the bottom piece 4b is provided at the tip of the bottom piece 4b, and the lower surface of the supported piece 14a is provided on the other adjacent bottom piece 4a. The support means 14 is comprised by the to-be-supported piece 14a and the support part 14b. As shown in FIG. 14, by folding the folding box 13, the support of the lower surface of the supported piece 14a to the support portion 14b is released.

  In this way, with the folding box 13 assembled in a box shape, the tip of the bottom piece 4b that is slidably coupled by the slide coupling means 17 in a state where it overlaps the lower surface side of the overlapping piece 11 is supported by the supported piece 14a and the supporting part 14b. The support means 14 is configured to support each bottom piece 4a adjacent to both sides so that the tip end portion 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 portion 6 is held in a rectangle or a square in plan view, the lower surface of the supported piece 14a is supported by the support portion 14b. It will be possible to maintain the state supported by.

  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.

  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. 2, 3, 5, and 6 is in an assembled state that is rectangular or square in plan view, As shown in FIG. 13, 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. 12. 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.

It is a principal part perspective view 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 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 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. 5 same as the above. (A) is sectional drawing which shows the state which the latching | locking part same as the above has latched to the lower surface side of the protrusion which raise | lifts, and (b) has locked the latching protrusion by fitting in the said small gap. It is a top view which shows the state which exists. (A) is sectional drawing of the Y1-Y1 line | wire of FIG. 6 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. 6 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.

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 7a Locking part 7b Lifting prevention protrusion 7c Small gap 7d Locking protrusion 8 Overlap allowance absorption part

Claims (2)

Adjacent side edges of the four side plates opposed to the front, rear, left and right are connected to each other in a foldable manner by side plate connecting hinges and assembled into a box shape to form a rectangular or square shape 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 is continuously foldable from the lower side of each side plate via the bottom piece connecting hinge portion, 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. A synthetic resin folding box comprising a bottom plate component that is configured to form a box-shaped bottom by overlapping the bottom pieces in a state assembled in a shape,
A locking part is provided on the side edge adjacent to the side edge of the bottom piece that is connected to the side edge connected to the bottom piece connecting hinge part, and the bottom piece is attached via the bottom piece connecting hinge part in a state of being assembled in a box shape. A lifting prevention protrusion is provided at the lower end of the inner surface of the adjacent side plate through an angle perpendicular to the connected side plate, and when the box is assembled in a box shape, the locking part gets over the lifting prevention protrusion and engages with the lower surface side of the lifting prevention protrusion. A folding box made of synthetic resin characterized by being stopped. Adjacent side edges of the four side plates opposed to the front, rear, left and right are connected to each other in a foldable manner by side plate connecting hinges and assembled into a box shape to form a rectangular or square shape 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 is continuously foldable from the lower side of each side plate via the bottom piece connecting hinge portion, 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. A synthetic resin folding box comprising a bottom plate component that is configured to form 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 An overlapping margin absorbing portion corresponding to the overlapping thickness is provided in a folded state in which each bottom piece overlaps the inner surface of each side plate,
Between the side end face of the overlap allowance absorbing portion and the side end face of the adjacent side plate, when the side plate adjacent to the overlap allowance absorbing portion is folded, the side end face of the overlap allowance absorbing portion and the side end face of the adjacent side plate are The outer surface side of the overlap absorbing portion and the outer surface side of the adjacent side plate are connected by a side plate connecting hinge portion through a small gap to avoid interference with each other, and connected to the bottom piece connecting hinge portion of the side edges of the bottom piece A locking projection is provided on the side edge adjacent to the side edge at a right angle, and the locking projection can be attached to and detached from the small gap in a state where the bottom piece is perpendicular to the side plate by assembling in a box shape. A synthetic resin folding box characterized by being locked.

Images