JP2015058961A - Folding box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding box that allows a starting-up operation and a folding operation to be performed in a small space and a posture at the starting-up to be stabilized, the whole of which can be brought up surely by holding a top frame part even when storing a heavy matter therein.SOLUTION: The folding box comprises: a top frame; a bottom frame 20; a pair of first side walls 30, one ends of which are connected through a hinge to the top frame and the other ends of which are free ends and can freely fall and stand so as to be rotatable in the box; and a pair of second side walla, one ends and the other ends of which are connected through hinges to the top frame and the bottom frame respectively and can freely fold and stand, where the free end sides of the first side walls, when taking vertical standing postures, are restricted in movement in a rotation direction by bottom surfaces getting over protruding portions 100 formed on the bottom frame and restricted in movement in a vertical direction by protruding plates formed in the bottom frame intruding into recessed portions 37 formed on the bottom surface, and further a load when the top frame is brought up by collision surfaces of the plates.

Description

  The present invention relates to a folding box used to store, store, or transport various articles.

  Folding boxes are widely used because the volume can be reduced in the absence of containment and the transportation cost and storage cost when not in use can be reduced. It is described in. In the folding box described in Patent Document 1, the upper sides of a pair of first side walls that regulate the height are hinge-connected to two opposite sides of the top frame, and an intermediate portion is arranged on the other two sides opposite to the top frame. The upper sides of the pair of second side walls which can be folded by hinge connection are hinge-connected, and the lower sides of the second side walls are hinge-connected to the two opposite sides of the bottom frame. The first side wall is rotatable about the hinge connecting portion as a fulcrum from the horizontal position to the upright position in the folding box when the second side wall is in the upright position.

  The folding container described in Patent Document 2 is a folding box having substantially the same configuration as the folding box described in Patent Document 1, but the member corresponding to the first side wall is folded via the hinge connecting portion. It is designed to rotate outside the box, not inside. When the member corresponding to the second side wall is in an upright posture, the engagement pieces formed to protrude outward from the left and right side sides and the bottom side of the member corresponding to the first side wall are the bottom plate And it engages with the side edge of the member equivalent to the 2nd side wall from the outside.

JP 2008-155983 A Japanese Patent No. 3157072

  In the case of the folding box of the form described in Patent Document 1, when the second side wall is in a standing posture, the first side wall is in a standing posture between the top frame and the bottom frame. The standing posture is maintained. However, no special locking portion is formed between the lower side (free end) of the first side wall and the bottom frame. Therefore, the movement of the first side wall to the inside of the folding box is free, and when the inward force acts on the first side wall inadvertently, the standing posture of the box collapses. There is a fear. Also, if the box is lifted with a member corresponding to the top frame, the first side wall does not function as a load support portion, and the downward load is applied to the connection portion between the second side wall and the top and bottom frames. It will be supported at all and may become unstable in strength.

  In the case of the folding box of the form described in Patent Document 2, when the member corresponding to the first side wall is in the standing posture, the engagement piece formed on the side edge of the member corresponds to the second side wall. The member corresponding to the first side wall is restricted from moving into the box by contacting the edge, and the engagement piece formed on the lower side of the member corresponding to the first side wall is the back surface of the bottom plate. (Lower surface) By entering and locking, even when trying to lift the box with a member equivalent to the top frame, both locking parts function as load support parts, ensuring strong stability doing. However, the member corresponding to the first side wall rotates on the outside of the folding box at the time of start-up and folding, and requires a large space during operation. Also, structurally, it is necessary to form locking pieces protruding outwardly on the side edge and lower side of the member corresponding to the first side wall, and the locking pieces are easily damaged.

  The present invention has been made in view of the circumstances as described above. In the folding box, the first side wall of the first side wall can be operated in a standing position while being able to be raised and folded in a small space. The standing posture can be maintained reliably, and even when the box is lifted with the top frame, the downward load is widely distributed to the connection between the first and second side walls and the top and bottom frames. An object of the present invention is to provide a folding box having high stability in strength.

  A folding box according to the present invention has a top frame, a bottom frame, a pair of first frames that have one end hinged to either the top frame or the bottom frame, and the other end is a free end that is free to fall and stand. A folding box having a pair of second sidewalls, one end of which is hinged to the top frame and the other end is hinged to the bottom frame, and which can be bent and raised. When the second side wall is in an upright posture, the side wall of the folding box is rotatable from the horizontal posture to the upright posture with the hinge connecting portion as a fulcrum in the folding box, and the first side wall is in the upright posture. Sometimes, a locking portion is formed between the free end side of the first side wall and the top frame or the bottom frame so as to restrict free movement of the first side wall. .

  In the folding box according to the present invention, the first side wall that regulates the height of the folding box when standing up can be rotated from a horizontal position to an upright position inside the folding box, and a large space is obtained during assembly and folding. Do not need. Further, in the raised state, a locking portion that can restrict free movement of the first side wall is formed between the free end side of the first side wall and the top frame or the bottom frame. Posture stability is ensured.

  In one aspect of the folding box according to the present invention, the locking portion is configured so that the first side wall rotates toward both the inside and the outside of the folding box when the first side wall is in a standing posture. It is a turning direction restricting portion for restricting.

  In this aspect, even when a force in the rotational direction is applied to the first side wall in the standing posture, the first side wall does not move in the rotational direction, so that the first side wall is folded carelessly. It is possible to reliably prevent the posture.

  As a specific aspect of the rotation direction restricting portion, a free end of the first side wall is provided with the raised portion between a vertical wall of the top frame or the bottom frame and a raised portion formed on a horizontal wall. A mode formed by getting over and entering can be exemplified.

  In this aspect, the free rotation to the outside of the first side wall is restricted by the vertical wall of the top frame or the bottom frame, and the free rotation to the inside of the first side wall is formed on the horizontal wall of the top frame or the bottom frame. It is regulated by the free end of the first side wall coming into contact with the raised portion. Moreover, in this aspect, since the 1st side wall does not require the locking piece of the form which protrudes outside, it can also avoid that the 1st side wall breaks carelessly.

  In another aspect of the folding box according to the present invention, the locking portion includes a vertical direction restricting portion that restricts the first side wall from moving in the vertical direction when the first side wall is in a standing posture. It is characterized by being.

  In this aspect, even when the top box is gripped and the folding box is lifted while in the standing posture, the first side wall is between the free end of the first side wall and the top or bottom frame. Since the up-down direction restricting portion that can restrict the side wall from moving upward is formed, the first side wall also functions as a downward load support material through the up-down direction restricting portion together with the second side wall. As a result, the strength of the folding box is improved.

  As a specific aspect of the up / down direction restricting portion, the up / down direction restricting portion is disposed between the horizontal wall of the top frame or the bottom frame and a projecting body protruding in the horizontal direction formed on the vertical wall. The aspect formed by the recessed part formed in the free end of 1 side wall entering can be illustrated.

  In this aspect, the upward movement of the first side wall is caused by a projecting body projecting in the horizontal direction formed on the vertical wall of the top frame or the bottom frame in the recessed portion formed at the free end of the first side wall. It is controlled by entering and contacting the upper surface of the projecting body and the recessed portion. In this aspect, even if the recessed portion is formed on the free end side of the first side wall, there is no need for a locking piece that protrudes outward, so that the first side wall is inadvertently damaged. Can also be avoided.

  The folding box by this invention WHEREIN: The said latching | locking part may be provided with only any one of an above-described rotation direction control part and an up-down direction control part, and may be provided with both. By providing both the rotation direction restricting portion and the vertical direction restricting portion, it is possible to obtain a folding box in which the posture at the time of start-up is more stable and stronger.

  In the folding box according to the present invention, preferably, the first side wall is a blow molded product, and the top frame or the bottom frame with which the free end side of the first side wall is engaged is an injection molded product. In this aspect, since the blow molded product and the injection molded product are aligned at the time of engagement and disengagement, the engagement proceeds smoothly and is difficult to disengage freely. It becomes a box.

  In the folding box according to the present invention, the structure of the top frame, the bottom frame, the first side wall, and the second side wall is not particularly limited, and is configured using an appropriate material according to the purpose of use of the folding box. be able to. In one aspect, the first side wall and the second side wall have a hollow portion at least inside a portion facing a storage space defined by them.

  In this aspect, since the first side wall and the second side wall function as heat insulating walls, the folding box can be effectively used as a cold box. When used as a cold box, the bottom frame is also formed by providing a member formed of a heat insulating material such as an appropriate foamed resin as a single part or as a separate member, or in a part of which is a hollow part. It can be set as a more preferable folding cold storage box by setting it as the form which equips it with the part which has these as a separate member. The same applies to the lid member used at the same time as the folding box. By forming the lid member with a heat insulating material or having a hollow part in a part thereof, a more preferable folding cold box can be obtained.

  According to the present invention, it is possible to provide a folding box that can perform a startup operation and a folding operation in a small space and that has a stable posture when started up. Furthermore, even when a heavy object is accommodated, a folding box that can hold the top frame part and can reliably lift the whole can be provided.

The perspective view which shows the state in which each side wall in one embodiment of the folding box by this invention stood up. The perspective view which shows the 1st side wall of the folding box shown in FIG. 1 seeing from an inner wall side. The perspective view which shows the 1st side wall shown in FIG. 2 seeing from an outer side wall side. The perspective view for demonstrating the detail of the bottom frame of the folding box shown in FIG. The side view by the partial cross section when the 1st side wall of the folding box shown in FIG. 1 is a standing state. It is sectional drawing which follows the aa line | wire of FIG. 5, (a) has shown the state immediately before a 1st side wall will be in an upright state, (b) has shown the state after becoming an upright state. It is sectional drawing which follows the bb line | wire of FIG. 5, (a) has shown the state immediately before a 1st side wall will be in an upright state, (b) has shown the state after having become an upright state. (A) is a front view which shows the state which the 2nd side wall of the folding box shown in FIG. 1 stood up, (b) is a side view. (A) is a figure which shows the folding middle of the folding box shown in FIG. 1, (b) is a figure which shows after folding.

  Hereinafter, an embodiment of a folding box of the present invention will be described with reference to the drawings. In the following, a case where the folding box is a cold box will be described as an example. However, as described above, the folding box is not limited to the cold box.

  As shown in FIG. 1, the folding box A according to the present embodiment has a rectangular shape in plan view, a top frame 10 and a bottom frame 20 that form a rectangular shape, a pair of first side walls 30 and 30, and a pair of second frames. Side walls 40, 40. Hereinafter, each member will be described.

(Ceiling 10)
The top frame 10 includes short side frames 11 and 11 facing each other and long side frames 12 and 12 facing each other, and the top surface is an opening 13. The top frame 10 is formed by, for example, an injection molding method using a resin such as a polyolefin resin. Although not shown, at the time of use, the opening 13 is closed by an appropriate lid. The top frame 10 has a vertical wall 14 on the outside and a top plate 15 extending inward from the upper end of the vertical wall 14 on the entire circumference, and the inner space surrounded by the inner edge of the top plate 15 is the opening 13. It has become.

  An appropriate number (two in the illustrated example) of first hinge convex pieces 16 are integrally formed in the vicinity of the upper end inside each short side frame 11. Further, an overhanging step portion 12a is formed in the lower portion of the top plate 15 in each longitudinal side frame 12, and an appropriate number of sets (three in the illustrated example) of second portions are formed on the back surface of the overhanging step portion 12a. The hinge convex piece 17 is integrally formed. In addition, the upper surface of the overhanging step portion 12a is used as a support portion for both end portions of a cold storage material (not shown).

(Bottom frame 20)
The bottom frame 20 is formed by, for example, an injection molding method using a resin such as a polyolefin resin. The bottom frame 20 has the same dimensions as the top frame 10 and has short side frames 21 and 21 facing each other and long side frames 22 and 22 facing each other. As shown in FIG. 4, in this example, the bottom surface of the bottom frame 20 is closed by a bottom plate 23 formed integrally with the short side frame 21 and the long side frame 22. As with the top frame 10, the bottom frame 20 has a vertical wall 24 on the entire outer periphery.

  As shown in FIG. 4, a planar horizontal wall 25 is formed at a position lower than the upper end of the vertical wall 24 inside each short side frame 21, and the vertical wall 24 extends vertically from the inner end of the horizontal wall 25. A wall 26 hangs down, and a lower end of the vertical wall 26 is connected to the bottom plate 23. In the vicinity of both ends in the longitudinal direction of each horizontal wall 25, an appropriate number (in the illustrated example, two) of raised portions 100, which will be described in detail later, are integrally formed, and the vertical side of each short side frame 21 is formed. A protruding plate 200 having an appropriate lateral width, which will be described in detail later, is integrally formed at the center of the wall 24 at a position separated from the horizontal wall 25 by an appropriate distance so as to protrude inward.

  Each longitudinal side frame 22 is formed with a bulging portion 27 extending inward substantially over the entire length, and is formed on the back surface of the protruding step portion 12a of the longitudinal side frame 12 of the top frame 10 in the bulging portion 27. A recess 28 for receiving a hinge convex piece 45 formed at the lower end of the lower partition portion 40B of the second side wall 40 to be described later is formed at a location facing the second hinge convex piece 17. . An upper end surface 27a of the bulging portion 27 is a horizontal plane, an inner end of the upper end surface 27a is an inner vertical wall 27b, and a lower end of the inner vertical wall 27b is a horizontal wall 25 of the short side frame 21. The horizontal wall 27c which protrudes horizontally at the same height as is formed.

  Although it is not essential in the folding box according to the present invention, in the illustrated case, the bottom plate 300 is disposed on the bottom plate 23 of the bottom frame 20 (see FIGS. 5 and 9). In this example, the bottom plate 300 is a hollow material formed using a resin such as a polyolefin-based resin and having a hollow portion 301 on the inside by a blow molding method (or an insert blow molding method). A reinforcing recess 302 is formed between the upper and lower wall surfaces of the bottom plate 300.

(A raised portion 100 formed on the short side frame 21)
With reference to FIG. 6, the raised part 100 formed in the said short side frame 21 is demonstrated. The raised portion 100 includes an inner inclined surface 101, a horizontal plane 102 connected to the upper end of the inner inclined plane 101, and an outer inclined plane 103 connected to the outer end of the horizontal plane 102. The inclination angle of the inner inclined surface 101 is made gentler than the inclination angle of the outer inclined surface 103. As will be described later, the height from the horizontal wall 25 to the horizontal surface 102 of the raised portion 100 is such that the first side wall 30 is free when the hinge-connected first side wall 30 rotates to a vertical standing posture. It is said that the end side can get over it.

(Protruding plate 200 formed on the short side frame 21)
The protruding plate 200 formed on the short side frame 21 will be described. As shown in FIGS. 4, 5, and 7, the protruding plate 200 includes a standing wall portion 201 that rises upward from the horizontal wall 25 of the short-side frame 21, and a horizontal short from the upper end of the standing wall portion 201. A horizontal wall 202 extending to the vertical wall 24 of the hand side frame 21. The horizontal wall 202 has an extension 203 (see FIGS. 4 and 5) that extends a predetermined distance in both directions from both ends of the standing wall 201.

(First side wall)
Next, the first side wall 30 will be described mainly with reference to FIGS. 2 and 3. The first side wall 30 has a flat box shape as a whole, and has four rounds that connect the rectangular inner wall 31a and the outer wall 31b, and the inner wall 31a and the outer wall 31b at a predetermined interval. Side wall 32. Preferably, the first side wall 30 is integrally formed using a resin such as a polyolefin-based resin so as to have a hollow portion 33 on the inside by a blow molding method (or an insert blow molding method). The hollow portion 33 is integrally formed with a reinforcing recess 34 that connects the inner wall 31a and the outer wall 31b.

  The lateral width W1 of the first side wall 30 is approximately equal to the distance between the inner sides of the long side frames 12 and 12 facing the top frame 10 (the distance between the inner sides of the long side frames 22 and 22 of the bottom frame 20 facing each other). equal. The height H <b> 1 is ½ of the distance between the short side frames 11, 11 of the top frame 10 facing each other (the distance between the short side frames 21, 21 of the bottom frame 20 facing each other). In the range which does not exceed, it sets suitably according to the height which the folding box A to obtain obtains.

  Two sets of hinge convex pieces 35, 35 are formed on the upper side of the side wall 32 of the first side wall 30. The hinge convex pieces 35, 35 are formed at positions corresponding to the first hinge convex pieces 16, 16 formed on the inner side of the short side frame 11 of the top frame 10. One hinge convex piece 16 is internally fitted (or externally fitted).

(Notch 36 formed in first side wall 30)
When the first side wall 30 is a lower end of the first side wall 30 on the inner wall 31a side and the first side wall 30 is hinge-connected to the short side frame 11 of the top frame 10 via the hinge convex piece 35, the bottom frame 20 Two notches 36 are formed at portions that face the two raised portions 100 formed on the short side frame 21. As shown in FIG. 6, the height of the notch 36 is slightly larger than the height of the raised portion 100, and its lateral width is also larger than the lateral width of the raised portion 100. As shown in FIG. 6 (b), the depth of the raised portion 100 is such that the first side wall 30 is in a standing posture, and the outer wall 31 b is the inner surface of the vertical wall 24 of the short side frame 21 of the bottom frame 20. The width of the lower end portion 36 a remaining on the side of the notch 36 of the first side wall 30 when the contacted posture is set is such that the outer inclined surface 103 of the raised portion 100 and the inner surface of the vertical wall 24. The width is set so as to be able to enter with almost no gap therebetween.

(Recess 37 formed in the first side wall 30)
The lower side frame 21 of the bottom frame 20, which is the lower end of the first side wall 30 on the outer wall 31 b side and is hinged to the short side frame 11 of the top frame 10 via the hinge convex piece 35. A recessed portion 37 is formed in a portion that faces the protruding plate 200 formed in the step from the outer wall 31b side toward the inner wall 31a side. As shown in FIGS. 3 and 7B, the recessed portion 37 includes a base opening portion 37a and a flat opening portion 37b connected to the upper side of the base opening portion 37a.

  The height of the recessed portion 37, that is, the distance from the lower end surface of the first side wall 30 to the upper surface 37 c of the flat opening portion 37 b is from the horizontal wall 25 of the bottom frame 20 to the horizontal wall portion 202 of the protruding plate 200. A little bigger than the height of. Further, the distance from the lower end surface of the first side wall 30 to the lower surface 37d of the flat opening 37b is from the horizontal wall 25 of the bottom frame 20 to the lower surface of the extension 203 in the horizontal wall 202 of the protruding plate 200. Equal to or slightly larger than the height of

  Further, the lateral width of the base opening 37 a of the recessed portion 37 is slightly larger than the lateral width of the standing wall 201 in the protruding plate 200, and the lateral width of the flat opening 37 b is larger than the horizontal width of the horizontal wall 202 in the protruding plate 200. Has also been enlarged. Therefore, as shown in FIG. 5 and FIG. 7B, the first side wall 30 is in a standing posture, and the outer wall 31 b is in a posture in contact with the inner side surface of the vertical wall 24 of the short side frame 21 of the bottom frame 20. Then, the protruding plate 200 has a standing wall 201 in the base opening 37a in the recessed portion 37 of the first side wall 30, and a horizontal wall 202 in the flat opening 37b. In this posture, the extended portion 203 of the horizontal wall portion 202 is in a state of entering a region of the flat opening portion 37b that extends to the side of the base opening portion 37a.

(Second side wall that can be bent and raised)
Next, the second side wall that can be bent and stood will be described with reference to FIG. In the folding box according to the present invention, the second side wall can be bent and raised, and has a configuration in which it can be folded when the folding box is folded and can stand when standing. The second side wall 40 having the configuration shown below is merely an example.

  The second side wall 40 has a rectangular shape as viewed from the side as a whole, and the width W2 is the distance between the short side frames 11, 11 facing the top frame 10 (the short side frame facing the bottom frame 20). The distance between the insides of 21 and 21 is almost equal. In this example, the second side wall 40 includes an upper partition portion 40A and a lower partition portion 40B that are arranged in parallel in the vertical direction, and a bent portion 40C that connects the opposing end face sides of the upper partition portion 40A and the lower partition portion 40B. And formed.

  The upper partition portion 40A and the lower partition portion 40B have the same dimensions, and are both rectangular in a side view, and include an open side end surface 41, an outer vertical wall 42 and an inner vertical wall 43 perpendicular to the release side end surface 41. Prepare. The upper partition portion 40A and the lower partition portion 40B are molded so as to have a hollow portion inside the wall member by a blow molding method (or an insert blow molding method) using a resin such as a polyolefin-based resin. A reinforcing recess 44 is also formed between the outer vertical wall 42 and the inner vertical wall 43.

  At the time of molding, the bent portion 40C is integrally molded at a position displaced to one side in the thickness direction of the upper partition portion 40A and the lower partition portion 40B. The thickness of the bent portion 40C is made thinner than the thickness of the upper partition portion 40A and the lower partition portion 40B so that the bending is easy.

  Three sets of hinge convex pieces 45 are integrally formed by insert molding on the upper end surface which is the release side end surface 41 of the upper partition portion 40A, and insert molding is also performed on the lower end surface which is the release side end surface 41 of the lower partition portion 40B. Thus, three sets of hinge convex pieces 45 are integrally formed. The hinge convex piece 45 is preferably a non-foamed molded product of a resin such as a polyolefin resin.

  As described above, the height H2 of the second side wall 40 is for the hinge formed on the upper end surface (the release side end surface 41) of the upper partition portion 40A when the first side wall 30 is in the standing posture. The convex piece 45 is located at the position of the second hinge convex piece 17 formed on the top frame 10, and the hinge convex piece 45 formed on the lower end surface (release side end face 41) of the lower partition portion 40B is the bottom. The height is such that the posture can be taken into the recess 28 formed in the frame 20.

  Then, a pin is inserted into the hinge convex piece 45 and the second hinge convex piece 17 for hinge connection, and a pin is inserted between the hinge convex piece 45 and the side wall of the recess 28 for hinge connection. Thus, the second side wall 40 is hinged to the top frame 10 at the upper end side and the bottom frame 20 at the lower end side, respectively, and the above-mentioned is performed according to the distance between the top frame 10 and the bottom frame 20. The bent portion 40C is in a bent posture with the inside.

  In the second side wall 40, since the thickness of the bent portion 40C is thinner than the thickness of the upper partition portion 40A and the lower partition portion 40B, a space S having a required depth is formed on the side of the bent portion 40C when standing. Is formed. In order to fill the space S, the second side wall 40 is provided with a spacer 50. The thickness in the vertical direction of the spacer 50 is substantially equal to the height in the vertical direction of the space S when the second side wall 40 is in the standing posture, and the horizontal width of the spacer 50 is substantially equal to the horizontal width of the space S. Preferably, the spacer 50 is a non-foamed molded product of a resin such as a polyolefin-based resin, and is an integrally molded product by injection. In the illustrated example, the spacer 50 includes two divided members 50A and 50A, and each spacer member 50A and 50A is detachably attached to the upper partition portion 40A by appropriate means. .

  FIG. 9A shows a state when the folding box A is started up or in the middle of folding, and FIG. 9B shows a state where the folding box A is completely folded. 9A and 9B, the first side wall 30 is shown as being housed in the top frame 10 in a horizontal posture. As shown in FIGS. 9A and 9B, the upper partition portion 40A of the second side wall 40 uses a bent portion 40C with respect to the lower partition portion 40B in a state where the spacer 50 is fixed. It is possible to bend freely to an angle of 180 degrees. Further, as shown in FIGS. 8A and 8B, when the upper partition portion 40A and the lower partition portion 40B are in the posture of rising vertically, the spacer 50 causes the space between the upper partition portion 40A and the lower partition portion 40B. In other words, the space S formed on the side of the bent portion 40C because the thickness of the bent portion 40C is thinner than the thickness of the upper divided portion 40A and the lower divided portion 40B is a state in which there is substantially no vertical gap. Filled with.

(Posture change of the first side wall 30)
The hinge convex piece 35 formed on the upper end surface of the first side wall 30 is internally fitted (or externally fitted) to the first hinge convex pieces 16 and 16 formed inside the short side frame 11 of the top frame 10. The first side wall 30 is hingedly connected to the short frame 11 side of the top frame 10 by connecting the two with pins. Then, the first side wall 30 is rotated from the horizontal lying down position shown in FIG. 9 to FIGS. 1, 5, etc. by rotating in the range of 90 degrees inside the folding box A with the hinge connecting portion as a fulcrum. Can be displaced in the vertical standing posture shown in FIG.

  In the standing posture, the lower end surface is in contact with the horizontal wall 25 of the bottom frame 20. Thereby, the height of the folding box A is regulated. Further, in the standing posture, the first side wall 30 moves freely between the free frame side of the first side wall 30, that is, between the end surface on the side not hinged and the bottom frame 20, as will be described below. By forming the locking portions (the rotation direction restriction portion and the vertical direction restriction portion) that can be restricted, the posture in which the folding box A stands up can be stabilized. As described above, when folded, the first side wall 30 is accommodated in the upper region of the top frame 10 by turning upward until the first side wall 30 is inward and in a horizontal posture. . The second hinge convex piece 17 formed on the inner side of the longitudinal side wall 12 of the top frame 10 has the first side wall 30 accommodated in the top frame 10 in a horizontal posture from the first side wall 30. Is also formed at a lower position.

(Description of locking part)
(Rotation direction restriction part)
With reference mainly to FIGS. 6A and 6B, the rotation direction restricting portion that restricts the movement in the rotation direction when the first side wall 30 is in the standing posture will be described. FIG. 6A shows a state immediately before the first side wall 30 is in a standing posture in which the first side wall 30 stands up vertically in a cross-section along aa in FIG. The arrow indicates the direction of rotation of the first side wall 30 when it is in the standing posture.

  As shown in FIG. 6 (a), immediately before the standing posture is reached, the lower end corner of the outer wall 31 b of the first side wall 30 abuts on the raised portion 100 formed on the bottom frame 20. When the operator further presses the first side wall 30 in the arrow direction, the lower end corner portion of the outer side wall 31b of the first side wall 30 moves along the inner inclined surface 101 of the raised portion 100. The whole moves upward. This upward movement occurs without difficulty because there is “play” that cannot be avoided structurally at the hinge connecting portions of the first side wall 30 and the second side wall 40.

  After the lower end corner portion moves along the inner inclined surface 101, the lower end portion 36 a remaining on the side of the notch portion 36 of the first side wall 30 is further rotated by the horizontal rotation of the raised portion 100. Pass over 102 and get over it. Then, the lower end portion 36a descends along the outer inclined surface 103 of the raised portion 100 (this descending also occurs naturally due to the existence of the “play”), so that the outer side of the first side wall 30 is removed. As shown in FIG. 6B, the wall 31b is in contact with the inner surface of the vertical wall 24 of the short side frame 21 of the bottom frame 20, and the region of the lower end 36a of the first side wall 30 is The posture enters between the vertical wall 24 and the outer inclined surface 103 of the raised portion 100. Thereby, in the folding box A by this invention, both the rotation to the outer side of the 1st side wall 30 and the rotation to the inner side will be in the controlled state.

  Further, as described above, since the inclination angle of the inner inclined surface 101 in the raised portion 100 is set to be gentler than that of the outer inclined surface 103, the raised portion 100 when the first side wall 30 is in the standing posture. Passing over smoothly progresses, and it becomes difficult to disengage after the engaged state.

(Vertical direction restriction part)
With reference mainly to FIG. 5 and FIG. 7, a description will be given of a vertical direction regulating portion that regulates movement in the vertical direction when the first side wall 30 is in a standing posture. FIG. 7A shows a state immediately before the first side wall 30 rises vertically and assumes a standing posture in a cross section taken along line bb in FIG. In FIG. 7A as well, the arrow indicates the rotation direction of the first side wall 30 when it is in the standing posture.

  As shown in FIG. 7A, immediately before the standing posture is reached, the recessed portion 37 formed in the lower end portion of the outer wall 31b of the first side wall 30 faces the protruding plate 200 formed in the bottom frame 20. It becomes a state. When the operator further rotates the first side wall 30 in the direction of the arrow, as shown in FIG. 7 (b), the recessed portion 37 has a posture in which the protruding plate 200 is held inside. In this posture, as shown in FIG. 5, the standing wall 201 of the protruding plate 200 is in the base opening 37 a in the recessed portion 37 of the first side wall 30, and the horizontal wall 202 is a flat opening. 37b, and the extended portion 203 of the horizontal wall portion 202 enters a region extending laterally of the base opening 37a in the flat opening 37b. .

  When the folding box A in the standing position is lifted with the top frame 10 in this position, the first side wall 30 is pulled upward. However, when the first side wall 30 is moved upward, the horizontal wall 202 of the protruding plate 200 of the bottom frame 20 enters the flat opening 37b, and the extension 203 contacts the lower surface of the flat opening 37b. As a result, it is regulated and the load is distributed on the contact surface. Further, the downward movement of the first side wall 30 is restricted by the lower end of the first side wall 30 coming into contact with the horizontal wall 25 of the bottom plate 20. That is, in the folding box A according to the present invention, the upward movement and the downward free movement of the first side wall 30 are both restricted, so that the raised posture is stabilized. Further, even when a heavy object is accommodated, the first side frame 30 can also function as a load support portion in addition to the second side frame 40, so that the whole can be safely held with the top frame portion. It can be lifted reliably.

(Other embodiments)
In the above description, the folding box has been described as being provided with both the rotation direction restricting portion and the vertical direction restricting portion between the first side wall 30 and the bottom frame 20, but the illustration is omitted. However, only one of the rotation direction restricting portion and the vertical direction restricting portion may be provided according to the purpose of use. Further, the description has been made so that the top frame 10 side is the hinge connecting portion, and the rotation direction regulating portion and the vertical direction regulating portion are formed on the bottom frame 20 side, but the opposite configuration, that is, the bottom frame 20 side is Even if the hinge connecting portion is formed and the rotation direction restricting portion and the vertical direction restricting portion are formed on the top frame 10 side, the intended purpose can be achieved, and this configuration is also within the technical scope of the present invention.

A ... folding box, 10 ... top frame, 20 ... bottom frame, 30 ... first side wall, 36 ... notch formed at the free end of the first side wall, 37 ... formed at the free end of the first side wall Recessed part, 40 ... second side wall, 100 ... Raised part formed on the bottom frame over which the free end of the first side wall gets over, 200 ... Formed on the bottom frame where the recessed part formed on the free end of the first side wall enters Protruding plate.

Claims (8)

A top frame, a bottom frame, a pair of first side walls whose one end is hinged to either the top frame or the bottom frame, the other end is a free end, and can fall and stand up, and one end A folding box having a pair of second side walls that are hinged to the top frame and the other end hinged to the bottom frame, and can be bent and raised,
The first side wall is rotatable around the hinge connecting portion as a fulcrum from a horizontal position to a standing position in the folding box when the second side wall is in a standing position, and the first side wall is in a standing position. A locking portion capable of restricting free movement of the first side wall is formed between the free end side of the first side wall and the top frame or the bottom frame. A featured folding box.   The locking portion is a rotation direction restricting portion that restricts rotation of the first side wall toward both the inside and the outside of the folding box when the first side wall is in a standing posture. The folding box according to claim 1.   The rotation direction restricting portion is formed by a free end of the first side wall getting over the raised portion between a vertical wall of the top frame or the bottom frame and a raised portion formed on a horizontal wall. The folding box according to claim 2, wherein the folding box is provided.   The said latching | locking part is an up-down direction control part which controls that a said 1st side wall moves to an up-down direction when the said 1st side wall is a standing posture. Folding box as described.   In the vertical direction restricting portion, a recessed portion formed at a free end of the first side wall enters between a horizontal wall of the top frame or the bottom frame and a projecting body projecting in the horizontal direction formed on the vertical wall. The folding box according to claim 4, wherein the folding box is formed.   The folding box according to claim 1, comprising both the rotation direction restricting portion according to claim 2 and the up and down direction restricting portion according to claim 4 or 5 as the locking portion.   The said 1st side wall is a blow molded product, The said top frame or bottom frame with which the said free end side of this 1st side wall engages is an injection molded product, The one of Claim 1 thru | or 6 characterized by the above-mentioned. The folding box according to item 1.   The said 1st side wall and the said 2nd side wall have a hollow part in the inside of the part which faces the storage space defined by these at least, The Claim 1 thru | or 7 characterized by the above-mentioned. Folding box.

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