Synthetic resin container

Abstract

One of the objectives is to facilitate the smooth raising of the side panels during the assembly of a modular synthetic resin container. Another objective is to reduce rattling between the synthetic resin container and the side panels when the modular synthetic resin container is assembled. [Solution] An assembly-type synthetic resin container 1 comprising a rectangular base plate 2 in plan view, and four side plates rotatably installed on the side ends of the four sides of the base plate 2, comprising a pair of opposing first side plates 3,3 which are raised later during assembly, and another pair of opposing second side plates 4,4 which are raised earlier, and guides 8 for guiding the rotation of the first side plates 3 installed on both ends of the inner surface 40 of the second side plates 4.

Description

Technical Field

[0001] The present invention relates to an assembled synthetic resin container. More specifically, the present invention relates to an assembled synthetic resin container in which side plates are installed on four sides of a square bottom plate via hinges or rotating shafts, and the side plates can be rotated to be in a folded state and an assembled state.

Background Art

[0002] Conventionally, side plates are installed on four sides of a bottom plate having a square planar shape via hinges or rotating shafts, and the side plates are assembled by engaging adjacent side plates with each other in a state where the side plates are erected. By releasing the engagement state of the side plates, an assembled synthetic resin container that can be folded inward is used. Synthetic resin containers are excellent in durability, can be repeatedly used, and are widely used instead of cardboard boxes from the perspective of resource saving.

[0003] As such a synthetic resin container, for example, it is composed of a bottom plate having a planar square shape and four side plates that are foldably connected along the side edges of the bottom plate. Each side plate can be folded inward in pairs with the opposing side plates. An assembled synthetic resin container is provided with an operation lever that can move up and down to release the engagement state when assembled on a pair of opposing side plates. The operation lever is provided with engaging portions at both ends of an operation portion, and a spring that biases the operation portion upward by being placed on a horizontal rib provided on the side plate is provided protruding on the lower surface. A synthetic resin container has been proposed (Patent Document 1).

[0004] Furthermore, to prevent adjacent side plates from rotating outward when assembled, a first engagement portion and a second engagement portion are provided on both ends of adjacent side plates, the first engagement portion consists of a locking projection consisting of a base portion projecting in the same direction as the inner surface and an insertion portion projecting perpendicularly from the base portion at both ends of the inner surface of the side plate that is folded first, a rectangular frame portion is provided on the inner surface of an extension portion that extends perpendicularly from both ends of the side plate that is folded later, and a through hole is formed in the frame portion by providing a notch in the extension portion of the part where the frame portion is provided, and the locking projection portion is formed to be inserted into the through hole, the second engagement portion consists of a planar, substantially L-shaped projection projecting from both ends of the side plate that is folded first, and an engagement plate projecting inward parallel to the inner surface of the side plate at an extension portion that extends perpendicularly from both ends of the side plate that is folded later, and the planar, substantially L-shaped projection is formed to engage with the engagement plate, A synthetic resin assembly container has been proposed in which the thickness of the rectangular frame portion provided on the side plate that is folded later is formed to be larger than the protruding width of the engagement plate in the second engagement portion (Patent Document 2). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-23669 [Patent Document 2] Japanese Patent Publication No. 2010-241470 [Overview of the project] [Problems that the invention aims to solve]

[0006] Furthermore, in the synthetic resin containers described in Patent Documents 1 and 2, a frame is provided on the inner surface of the upper end of an extension that protrudes perpendicularly from both ends of the long-side side plate, which is folded later, forming a rectangular through-hole. Locking projections formed on both ends of the inner surface of the short-side side plate, which is folded first, are inserted into the through-hole, preventing the long-side side plate from rotating outward and engaging adjacent side plates to prevent the container from falling apart.

[0007] Due to this configuration, when assembling the container, the long-side panels are raised first, and the locking protrusions of the short-side panels, which are raised later, are inserted into the through-holes at the upper end of the long-side panels. However, when inserting them, the long-side panels are not positioned and are not fixed in a position where the locking protrusions can be inserted into the through-holes. As a result, the locking protrusions come into contact with the edges or frames of the through-holes, making it difficult to smoothly insert them into the through-holes. Furthermore, if the long-side panels are even slightly tilted inward or perpendicular to the bottom panel, they come into contact with the long-side panels when raising the short-side panels, preventing smooth raising of the short-side panels and making it difficult to smoothly insert the locking protrusions into the through-holes.

[0008] Furthermore, in the assembled state where the locking projection is inserted into the through-hole, the locking projection is rotated to insert it into the through-hole. As a result, a gap is created between the locking projection and the through-hole, which leads to problems such as the synthetic resin container and side plates rattling easily, and the container being prone to deformation.

[0009] Therefore, one of the objectives of the present invention is to avoid contact between the side panels that are raised earlier and the side panels that are raised later when assembling a modular synthetic resin container, thereby enabling the raising of the side panels that are raised later to be smooth. Another objective is to enable the locking projection of the side panel that is raised later to be smoothly inserted into the through hole of the side panel that is raised earlier when assembling a modular synthetic resin container. Another objective is to reduce rattling between the synthetic resin container and the side panels when the modular synthetic resin container is assembled. Another objective is to prevent deformation of the synthetic resin container when the modular synthetic resin container is assembled. [Means for solving the problem]

[0010] As a means to solve the above-mentioned problems, the present invention is an assembly-type synthetic resin container comprising a rectangular base plate in plan view and four side plates rotatably installed on the side ends of the four sides of the base plate, the container comprising a pair of opposing first side plates that are raised later during assembly and another pair of opposing second side plates that are raised earlier, and guides for guiding the rotation of the first side plates are installed on the inner surfaces of the second side plates.

[0011] Furthermore, it is an assembly-type synthetic resin container comprising a rectangular base plate in plan view, and four side plates rotatably mounted on the side ends of the four sides of the base plate, comprising a pair of opposing first side plates that are raised later during assembly, and another pair of opposing second side plates that are raised earlier, with guides installed on both ends of the inner surface of the second side plates to guide the rotation of the first side plates.

[0012] Furthermore, in the above-mentioned synthetic resin container, the guide is composed of a projection protruding from the inner surface of the second side plate, and the assembled synthetic resin container has an inclined portion that gradually expands inward from the center of the second side plate toward the side edge.

[0013] Furthermore, in the above-mentioned synthetic resin container, the guide is composed of a projection protruding from the inner surface of the second side plate, and has an inclined portion that gradually expands inward towards the synthetic resin container from the center of the second side plate toward the side edge, and also has a parallel portion that is parallel to the inner surface of the second side plate toward the side edge of the second side plate, from the tip of the inclined portion toward the side edge of the second side plate, making it an assembly-type synthetic resin container.

[0014] Furthermore, in the above-mentioned synthetic resin container, the guide is an assembled synthetic resin container in which the projection is installed on a transverse rib provided on the inner surface of the second side plate.

[0015] Furthermore, in the above-mentioned synthetic resin container, the guide is installed in a position that contacts the first side plate when the first side plate is rotated and when the synthetic resin container is assembled.

[0016] Furthermore, in the above-mentioned synthetic resin container, the guide is an assembled synthetic resin container in which one or more guides selected from a first guide installed at the upper end of the second side plate and a second guide installed below the first guide.

[0017] Furthermore, in the above-mentioned synthetic resin container, an auxiliary guide is installed on the side end of the second side plate of the first guide, extending in a direction intersecting the first guide, to guide the rotation of the first side plate. This is an assembly-type synthetic resin container.

[0018] Furthermore, in the above-mentioned synthetic resin container, the synthetic resin container is equipped with one or more selected from a first engaging portion, a second engaging portion, and a locking mechanism for stopping the rotation of the side plate in the assembled state, the first engaging portion is configured to include an insertion projection provided on the first side plate and an insertion hole provided on the second side plate, the insertion projection is provided on the upper part of the outer surface of the side edge of the first side plate, the insertion hole is provided on the upper part of an extension that extends inward from both ends of the second side plate, and is positioned in the assembled state of the synthetic resin container so that the insertion projection can be inserted, the second engaging portion is equipped with an engaging projection formed to protrude outward from both ends of the first side plate and an opening inward from the extension of the second side plate The assembly-type synthetic resin container is configured to have an engaging recess, and in the assembled state of the container, the engaging projection is positioned to be inserted into the engaging recess, and the locking mechanism comprises locking projections provided on both ends of the second side plate and a locking member installed on the first side plate, the locking projections are configured to protrude inward from spring-loaded plates formed on both ends of the second side plate, and the locking member is installed on the upper outer part of the first side plate and comprises an operating part, an engaging projection protruding from the tip of the operating part that engages with the locking projection, and a spring provided on the lower surface of the operating part that biases the locking member upward.

[0019] Further, in the synthetic resin container, the guide is one or more guides selected from a first contact guide that contacts the insertion protrusion when the first side plate rotates among the first guides provided at the upper end of the second side plate, a first non-contact guide that does not contact the insertion protrusion when the first side plate rotates among the first guides, and a second guide provided below the first guide and not contacting the insertion protrusion when the first side plate rotates, which is an assembled synthetic resin container.

[0020] Further, in the synthetic resin container, an auxiliary guide for guiding the rotation of the first side plate extending in a direction intersecting the first guide is installed on the side end side of the second side plate of the first contact guide and / or the first non-contact guide, which is an assembled synthetic resin container.

[0021] Further, in the synthetic resin container, it includes the first engaging portion, the second engaging portion, and the locking mechanism, and also includes the first non-contact guide and the second guide, which is an assembled synthetic resin container.

[0022] Further, in the synthetic resin container, the first contact guide contacts the insertion protrusion and the side edge portion of the first side plate when the first side plate rotates, and is installed at a position contacting the side edge portion when the synthetic resin container is in an assembled state, which is an assembled synthetic resin container.

[0023] Further, in the synthetic resin container, the first non-contact guide is installed at a position contacting the side edge portion of the first side plate when the first side plate rotates and / or when the synthetic resin container is in an assembled state, which is an assembled synthetic resin container.

[0024] Further, in the synthetic resin container, the second guide is installed at a position contacting the side edge portion of the first side plate when the first side plate rotates and / or when the synthetic resin container is in an assembled state, which is an assembled synthetic resin container.

[0025] Furthermore, in the synthetic resin container, the tapered angle of the facing surface of the tip of the insertion protrusion, which faces the first contact guide, is different from the inclined angle of the side edge of the inclined portion of the first contact guide. It is an assembled synthetic resin container.

[0026] Furthermore, it is a method for assembling an assembled synthetic resin container, which includes a bottom plate that is square in plan view and four side plates rotatably installed at the side ends of the four sides of the bottom plate. During assembly, there are a pair of first side plates that are erected later and another pair of second side plates that are erected first, and a guide for guiding the rotation of the first side plates is installed on the inner surface of the second side plates. When erecting the first side plates, the method is characterized in that the first side plates are brought into contact with the guides to push and expand the second side plates outward for assembly.

[0027] Furthermore, in the method for assembling the synthetic resin container, in the assembled state, the first side plates maintain contact with the guides of the second side plates, and the first side plates and the guides of the second side plates are pressed against each other. It is a method for assembling an assembled synthetic resin container.

Advantages of the Invention

[0028] According to the present invention as described above, when assembling an assembled synthetic resin container, when erecting the side plates that are erected later, it is possible to avoid contact with the side plates that were erected earlier and smoothly erect the side plates that are erected later. Also, when assembling an assembled synthetic resin container, the locking protrusions of the side plates that are erected later can be smoothly inserted into the through holes of the side plates that were erected earlier. Also, in the assembled state of the assembled synthetic resin container, it is possible to reduce rattling between the synthetic resin containers and the side plates. Also, in the assembled state of the assembled synthetic resin container, it is possible to prevent deformation of the synthetic resin container.

Brief Description of the Drawings

[0029] [Figure 1] Perspective view of the state during assembly of an embodiment of the present invention [Figure 2] The right half is a cross-sectional view; this is a side view of one embodiment of the present invention. [Figure 3] Partial perspective view of an embodiment of the present invention in an assembly in progress. [Figure 4] Partial perspective view of the second side plate in one embodiment of the present invention [Figure 5] Partial perspective view of the first side plate in one embodiment of the present invention [Figure 6] Partial perspective view from the inside of an assembled embodiment of the present invention [Figure 7] Partial perspective view from the outside of an assembled embodiment of the present invention. [Figure 8] Partial perspective view of the second side plate in another embodiment of the present invention [Figure 9] Partial perspective view of the second side plate in another embodiment of the present invention [Modes for carrying out the invention]

[0030] The synthetic resin container of the present invention is an assembly-type synthetic resin container in which side plates are rotatably attached to each of the four sides of a rectangular base plate, and the container can be folded and assembled by rotating the side plates.

[0031] Embodiments of the present invention will now be described with reference to the drawings. As shown in Figures 1 and 2, the synthetic resin container 1 of the present invention is composed of one bottom plate 2 and four side plates 3, 3, 4, 4. One side plate is installed along the side edges of each of the four sides of the bottom plate 2, which is rectangular in plan view. The container has four side plates: a pair of opposing first side plates 3, 3 which are raised later during assembly and folded first when folding, and a pair of opposing second side plates 4, 4 which are raised earlier during assembly and folded later when folding.

[0032] Furthermore, the synthetic resin container 1 is equipped with a pivot mechanism 20 for rotatably mounting the first side plate 3 and the second side plate 4 on the bottom plate 2. The pivot mechanism 20 is composed of a shaft 21 provided at the lower ends of the first side plate 3 and the second side plate 4, and a bearing 22 provided at the side end of the bottom plate 2 that supports the shaft 21. In this way, the first side plate 3 and the second side plate 4 are rotatable around the side end of the bottom plate 2. In addition, handle holes 10 for inserting fingers when carrying the synthetic resin container 1 are provided at approximately the upper center of the first side plate 3 on the short side and approximately the upper center of the second side plate 4 on the long side.

[0033] In this embodiment, the first side plate 3 is the side plate on the short side, and the second side plate 4 is the side plate on the long side. When folding the synthetic resin container 1, the two first side plates 3,3 on the short side are first folded inward toward the bottom plate 2 and stacked on the bottom plate 2 parallel to it, and then the two second side plates 4,4 on the long side are folded later so as to be stacked on top of the folded first side plates 3,3 on the short side. The bearing 22 that supports the second side plates 4 on the long side of the bottom plate 2 is positioned on a height adjustment part 17 that is formed to protrude upward from the side end of the bottom plate 2 so that the second side plates 4,4 that are folded later are stacked parallel to the bottom plate 2 and the first side plates 3. With this configuration, the final folded state, when the four first side plates 3,3 and second side plates 4,4 are folded, is an overall nearly flat state (not shown).

[0034] In the assembled state of the synthetic resin container 1, the first side plate 3 on the short side and the second side plate 4 on the long side are adjacent to each other, and both ends in the width direction are provided with a first engaging part 5, a second engaging part 6, and a locking mechanism 7 to engage the first side plate 3 and the second side plate 4 when they are raised and assembled, thereby preventing them from rotating and folding. In addition, the second side plate 4, which is raised first, is provided with a guide 8 to guide the rotation of the first side plate 3, which is raised later.

[0035] The first engaging portion 5 is a mechanism that primarily prevents the second side plate 4 from rotating outward in the assembled state of the synthetic resin container 1. It is also a mechanism that prevents the first side plate 3 from rotating outward and the second side plate 4 from rotating inward. As clearly shown in Figures 3 and 7, it is configured with an insertion projection 32 provided on the first side plate 3 on the shorter side and an insertion hole 42 provided on the second side plate 4 on the longer side into which the insertion projection 32 is inserted.

[0036] Furthermore, as clearly shown in Figures 3 and 5, side edge portions 329 are provided that extend from both ends of the first side plate 3 on the shorter side, which is folded first, on the same plane as the first side plate 3, and overlap with the extended portion of the second side plate 4 when the synthetic resin container 1 is assembled.

[0037] Furthermore, as clearly shown in Figures 3 and 4, extensions 41 are provided that extend inward from both ends of the second side plate 4 on the longer side, which is later folded, in a direction perpendicular to the second side plate 4, and overlap with the side edge 329 of the first side plate 3 when the synthetic resin container 1 is assembled. The insertion hole 42 is defined by a frame portion 47 provided on the upper part of the inner surface 49 of the extension portion 41, and a notch 48 is provided by cutting out the outer surface 410 of the extension portion 41 in the part where the frame portion 47 is provided, and the extension is formed by opening into the frame portion 47 and the notch 48 and penetrating the extension portion 41, i.e., the second side plate 4.

[0038] The extension portion 41 is formed by extending and bending the second side plate 4, and contacts the side edge portion 329 of the first side plate 3 on the shorter side which is folded first, preventing the first side plate 3 from rotating outward. It is also formed with an extension width sufficient to provide the insertion hole 42 of the first engaging portion 5 and the engaging recess 44 of the second engaging portion 6, which will be described later. With this configuration, when folding the synthetic resin container 1, the first side plate 3 is folded first, and the second side plate 4 is folded later.

[0039] As clearly shown in Figures 3 and 5, the insertion projection 32 protrudes outward from the upper part of the outer surface of the side edge 329 of the first side plate 3, perpendicular to the side edge 329, and is formed in a roughly L-shape in plan view with respect to the side edge 329, and is positioned so as to be insertable into the insertion hole 42 when the synthetic resin container 1 is assembled. Furthermore, the insertion projection 32 is configured to be the same length as the insertion hole 42, and when the synthetic resin container 1 is assembled, the tip surface 320 of the insertion projection 32 is located on approximately the same plane as the outer surface 410 of the extension 41 of the second side plate 4.

[0040] In this way, since the insertion hole 42 penetrates the second side plate 4 and the insertion projection 32 is configured to be the same length as the insertion hole 42, the length of the insertion projection 32 inserted into the insertion hole 42 can be increased, and the second side plate 4 on the longer side and the side plate 3 on the shorter side can be reliably engaged.

[0041] Furthermore, as shown in Figure 7, when the insertion projection 32 is inserted into the insertion hole 42, a portion of the frame portion 47 of the second side plate 4 is inserted between the insertion projection 32 and the side end surface 30 of the first side plate 3.

[0042] The insertion projection 32 has a rectangular prism base 327 and a truncated square pyramid tip 328 that tapers towards the tip to facilitate insertion into the insertion hole 42. The insertion hole 42 is also rectangular in shape. The cross-sectional shape of the base 327 and the cross-sectional shape of the insertion hole 42 are identical and rectangular. The cross-section of the insertion projection 32 refers to the cross-section perpendicular to the projection direction, and the cross-section of the insertion hole 42 refers to the cross-section perpendicular to the depth direction.

[0043] When the first side plate 3 on the shorter side is raised and assembled with the second side plate 4 on the longer side, the insertion projection 32 is inserted into the insertion hole 42 and engages with the insertion hole 42. In this way, the engagement between the insertion projection 32 and the insertion hole 42 prevents the second side plate 4 on the longer side from rotating, and the assembled state can be maintained.

[0044] Furthermore, although the insertion hole 42 is constructed to penetrate the second side plate 4, it may also be a concave hole that opens only on the inside of the second side plate 4. Also, the insertion projection 32 may be configured to be shorter in length than the insertion hole 42. Furthermore, it is preferable that at least the tip of the insertion projection 32 is tapered toward the tip so that it can rotate to approach and smoothly insert into the insertion hole 42, but it is not necessary for it to be tapered. When the insertion projection 32 is inserted into the insertion hole 42, a gap is formed between the two, but it may be configured to be an interference fit or an intermediate fit.

[0045] Furthermore, the insertion projection 32 and insertion hole 42 are not limited to the above shapes, as long as the insertion projection 32 is configured in a shape that allows it to be inserted into the insertion hole 42. They may be configured as follows: That is, the shape of the insertion projection and insertion hole is not limited to a rectangular cross-section, but may be a triangular cross-section, other polygons, circles, ellipses, etc. Also, for example, the insertion projection may be cylindrical and the insertion hole cylindrical, or the cross-sectional shapes of the insertion projection and insertion hole may be the same shape other than a square, or they may have different cross-sectional shapes, such as a cross-shaped or square insertion projection in plan view and a circular insertion hole. In addition, the insertion projection may be a prism, frustum, or cone with the same or similar cross-sectional shape from the bottom end to the top end. Even if the cross-sectional shapes are similar, the base may be cylindrical and the tip semicircular, or different shapes in the direction of projection may be combined. Furthermore, the insertion hole may be a column with the same cross-sectional shape along its entire length, but it may also be a tapered frustum or cone shape.

[0046] By configuring the insertion hole 42 with a circular cross-section, it has no corners, especially at the opening end, improving resistance to damage caused by pressure or tension from the insertion projection 32. In this configuration, the entire length of the insertion hole 42 may be cylindrical, or at least a portion including the opening end may be cylindrical. Furthermore, by making at least a portion of the insertion projection 32 cylindrical, it becomes less prone to damage compared to a rectangular projection.

[0047] The second engaging portion 6 is a mechanism that primarily prevents the second side plate 4 from rotating outward in the assembled state of the synthetic resin container 1. As clearly shown in Figures 3 and 5, it is composed of engaging projections 33 formed to protrude outward from both side edges 329 of the first side plate 3 on the short side, and engaging recesses 44 that open inward and are provided on the extension 41 of the second side plate 4 on the long side.

[0048] The engaging projection 33 is shaped like a rectangular prism and protrudes outward from the side edge 329 of the first side plate 3, below the insertion projection 32, at a right angle to the side edge 329, that is, protruding in the same direction as the insertion projection 32. In plan view, it is formed in a roughly L-shape with the side edge 329 and is positioned so as to be insertable into the engaging recess 44 when the synthetic resin container 1 is assembled.

[0049] Furthermore, as clearly shown in Figure 4, an engagement plate 43 is formed on the extension portion 41, which extends perpendicularly from both ends of the second side plate 4 on the longer side that is later folded, and which protrudes inward parallel to the inner surface 40 of the second side plate 4. The protruding width of the engagement plate 43 is less than or equal to the length of the engagement projection 33. In this way, an engagement recess 44 with a roughly U-shaped cross-section is formed by the inner surface 40 of the second side plate 4 on the longer side, the extension portion 41, and the engagement plate 43.

[0050] When the first side plate 3 on the short side is raised and assembled with the second side plate 4 on the long side, the engaging projection 33 is inserted into the engaging recess 44 and engages with the engaging plate 43, and the tip surface 339 of the engaging projection 33 is close to the inner surface 49 of the extension 41. In this way, the engaging projection 33 and the engaging plate 43 prevent the second side plate 4 on the long side from rotating outward, and a robust assembled state can be maintained.

[0051] Furthermore, the number and shape of the engaging projections 33 are not particularly limited as long as they engage with the engaging plate 43. As shown in the figures, multiple projections may be provided in the vertical direction, but there may also be just one. They can also be formed integrally in a continuous vertical direction, but it is preferable to divide them into multiple parts in the vertical direction as shown in Figures 3 and 5. In addition, although not shown in the figures, the engaging projections 33 may be configured to fit into grooves provided on the inner surface 49 of the extension 41.

[0052] The locking mechanism 7 is a mechanism that, in the assembled state of the synthetic resin container 1, where the second side plate 4 on the long side is raised from the folded state, and then the first side plate 3 on the short side is raised, primarily prevents the first side plate 3 on the short side from rotating in the direction of the bottom plate 2 (inward direction), thereby preventing it from tipping over, further prevents unintended release of the assembled state of the synthetic resin container 1, and further facilitates the intended release of the assembled state of the synthetic resin container 1. As shown in Figures 3 to 5, the locking mechanism 7 is composed of spring-loaded locking protrusions 401 provided on both ends of a pair of opposing second side plates 4, 4 that are folded later, and locking members 36 installed on a pair of opposing first side plates 3, 3 that are folded first.

[0053] As shown in Figures 3 and 4, the locking projection 401 is formed to protrude inward from plates 45 at both ends of the second side plate 4 toward the synthetic resin container 1. Specifically, the plates 45 and the locking projection 401 are formed at both ends of a single second side plate 4. The locking projection 401 is formed at the tip of the free end of the plate 45, which has a spring-like action. One side of the plate 45 is connected to the second side plate 4 by a substantially U-shaped slit 411 on the top, bottom, and three sides near the side end of the second side plate 4. The extension 41 side closer to the second side plate 4 is the free end. It is preferable to provide a through hole 46 formed by cutting out the central part of the plate 45.

[0054] The locking projection 401 is formed in a roughly triangular shape in its vertical cross-section, with its upper surface 417 being flush with the upper surface of the plate 45. The rear surface 418 opposite to the extension 41 is inclined downwards toward the extension 41, forming a tapered shape in side view, while the tip surface 419 is formed parallel to the opposing extension 41. The plate 45, along with the slit 411, has a through-hole 46 formed by cutting out the central part of the plate 45, giving it flexibility, and the locking projection 401 can move in the up, down, left, and right directions, thus having a spring action. However, the flexibility and spring action will be weaker, but the through-hole 46 does not need to be formed in the plate 45.

[0055] The locking member 36 is a separate component from the first side plate 3, movably mounted on the first side plate 3. As clearly shown in Figures 2, 3, and 5, the locking member 36 is configured such that engaging projections 362, which engage with the locking projection 401, protrude parallel to the operating part 361 at both ends of the operating part 361 for operation by an operator to release the assembled state of the synthetic resin container 1, and two springs 37 are symmetrically provided on the lower surface of the operating part 361. The operating part 361 has the same width as the first side plate 3, and the engaging projections 362 are configured to overlap with the side edge 329. In addition, the upper part 366 of the front surface of the engaging projection 362 is inclined backward toward upward. A recess 364 for the operator's finger rest is provided on the outer surface of the approximate center of the operating part 361, and the springs 37 have the effect of biasing the locking member 36 upward (in the direction of arrow A), and are formed by projecting leaf springs diagonally downward. The locking member 36 is installed on the upper outer part of the first side plate 3, and the lower end of the spring 37 is located on the rib 392 that protrudes outward from the first side plate 3.

[0056] Furthermore, as shown in Figure 5, the locking member 36 is installed by inserting an arrowhead-shaped projection 53 provided on the back of the operating part 361 into a slit 51 formed in the first side plate 3. With this configuration, the locking member 36 can slide vertically and will not come off the first side plate 3.

[0057] Furthermore, in order to mount the locking member 36 of the first side plate 3 so that it can slide freely in the vertical direction, the configuration may be reversed from the above configuration, that is, an arrowhead-shaped projection may be made to protrude from the first side plate 3 side, and a slit may be provided in the operating portion 361 of the locking member 36. In addition, as long as the locking member 36 can move up and down, the mounting configuration to the first side plate 3 can be any other arbitrary structure.

[0058] Guide 8 is configured to guide the rotation of the first side plate 3 and is installed on both ends of the inner surface 40 of the second side plate 4. Guide 8 includes a first guide 81 installed on the upper end of the second side plate 4 and a second guide 82 installed below the first guide 81.

[0059] The first guide 81 is configured to guide the rotation of the first side plate 3, and depending on the installation location, it is also configured to guide the insertion projection 32 into the insertion hole 42. The first guide 81 is located at the upper end of the second side plate 4, above the lock projection 401, and is configured to contact the insertion projection 32 and / or the side edge 329 of the first side plate 3 when the first side plate 3 rotates, and to contact the side edge 329 when the synthetic resin container 1 is assembled.

[0060] As clearly shown in Figure 4, the first guide 81 is installed at both ends of the inner surface 40 of the second side plate 4, at the corners of the extensions 41 that extend from the second side plate 4 and its both ends, with the frame portion 47 located on the extension line. Note that "on the extension line" includes cases where the guide 8 and the frame portion 47 are in contact and cases where they are not. Furthermore, the first guide 81 is composed of a flat plate-shaped projection that protrudes from the inner surface 40 of the second side plate 4. More specifically, the flat plate-shaped projection is installed on a transverse rib 407 provided on the inner surface 40 of the second side plate 4, which is parallel to the bottom surface 2 when assembled, that is, the transverse rib 407 is extended in the inward direction of the synthetic resin container 1. The first guide 81 protrudes horizontally when the synthetic resin container 1 is assembled and is straight in side view.

[0061] Furthermore, the first guide 81 is configured such that the transverse rib 407 gradually expands and protrudes inward from the center of the second side plate 4 toward the side end, that is, toward the extension portion 41, toward the inside of the synthetic resin container 1, forming an inclined portion 85. In addition, a parallel portion 86 parallel to the inner surface 40 of the second side plate 4 is provided extending from the tip of the inclined portion 85 toward the side end of the second side plate 4 and toward the frame portion 47. By providing the inclined portion 85, the insertion projection 32 and / or the side edge portion 329 can make smooth contact with the first guide 81 without getting caught, and the rotation of the first side plate 3 can be made smooth.

[0062] More specifically, the first guide 81 is configured as follows: in plan view, it is linearly inclined from the second side plate 4 toward the inside of the synthetic resin container 1 and has an inclined portion 85 having a side edge 75 that is not parallel to the inner surface 40 of the second side plate 4 and whose distance from the inner surface 40 changes; and from the tip of the inclined portion 85 toward the frame portion 47, it has a parallel portion 86 that is parallel to the inner surface 40 of the second side plate 4 and whose distance from the inner surface 40 does not change, extending toward the side edge of the second side plate 4 and toward the frame portion 47. Furthermore, the tip of the parallel portion 86 located toward the side edge of the second side plate is connected to the frame portion 47.

[0063] The first guide 81 is provided as a first non-contact guide 812, which is installed in a position where the frame portion 47 is on the extension line, outside the rotational trajectory of the insertion projection 32, and where the insertion hole 42 is not on the extension line, and which contacts the side edge portion 329 of the first side plate 3 when the first side plate 3 rotates, but does not contact the insertion projection 32. Note that "installed on the trajectory" includes the state in which the first guide 81 is present in any part of the trajectory.

[0064] With this configuration, at the final stage of rotation of the first side plate 3, in other words, when the upper end of the first side plate 3 approaches the extension 41 of the second side plate 4, the side edge 329 of the first side plate 3 contacts the first non-contact guide 812, which is the first guide 81, pushing the second side plate 4 outward. The first side plate 3 does not contact the second side plate 4 except with the first guide 81 and the second guide 82, guiding the first side plate 3 to the direction and position in which it should rotate, thereby smoothly guiding the rotation of the first side plate 3 and assisting in its upright position. Furthermore, the insertion projection 32 can be smoothly guided into the insertion hole 42, assisting in the assembly of the synthetic resin container 1. Moreover, when the synthetic resin container 1 is assembled, the side edge 329 near the insertion projection 32 contacts and presses against the first non-contact guide 812, which is the first guide 81, suppressing rattling of the side plates 3 and 4 and preventing deformation of the synthetic resin container 1.

[0065] Alternatively, as shown in Figure 8, the first guide 81 may be provided with a frame portion 47 on the extension line, positioned on the rotational trajectory of the insertion projection 32, and a first contact guide 811 that contacts the side edge portion 329 of the first side plate 3 and the insertion projection 32 when the first side plate 3 rotates. The first contact guide 811 is connected to the circumferential edge of the insertion hole 42. With this configuration, the first contact guide 811 can also be configured to directly guide the insertion projection 32 into the insertion hole 42.

[0066] The first guide 81 may be configured to install either a first contact guide 811 or a first non-contact guide 812, but as shown in Figure 9, it may also be configured to install both a first contact guide 811 and a first non-contact guide 812. The first contact guide 811 is also configured to directly guide the insertion projection 32 to the insertion hole 42, so it is preferable to install it. The first guide 81 uses two transverse ribs 407 to install one first contact guide 811 and one first non-contact guide 812 each, in total, with a gap between them vertically, parallel to each other, and parallel to the bottom surface 2. The first contact guide 811 and the first non-contact guide 812 extend from the transverse ribs 407 in the same shape and overlap perfectly in a plan view. The installation width of the two first guides 81 is not particularly limited.

[0067] In the configuration where either the first contact guide 811 or the first non-contact guide 812 is installed, the number of first guides is not limited, and it may be configured with two or more instead of one. Also, in the configuration where both the first contact guide 811 and the first non-contact guide 812 are installed, the number of first guides is not limited, and it may be configured with three or more instead of two. In the configuration where two first contact guides 811 are installed, they are installed at intervals less than or equal to the vertical width L of the insertion projection 32, and when the first side plate 3 rotates, the insertion projection 32 comes into contact with the two first guides 81. Furthermore, in the embodiment shown in Figure 9, the first contact guide 811 is installed above the first non-contact guide 812, but the first contact guide 811 may also be installed below the first non-contact guide 812.

[0068] By installing both the first contact guide 811 and the first non-contact guide 812 in this configuration, when the first side plate 3 is in the final stage of rotation, in other words, when the upper end of the first side plate 3 approaches the extension 41 of the second side plate 4, the insertion projection 32 and / or side edge 329 of the first side plate 3 come into contact with the first guide 81, more specifically, the insertion projection 32 comes into contact with the first contact guide 811, and then the side edge 329 comes into contact with the first contact guide 811 and the first non-contact guide 812, pushing the second side plate 4 outward. The first side plate 3 does not come into contact with the second side plate 4 except with the first guide 81 and the second guide 82, guiding the first side plate 3 to the direction and position in which it should rotate, thereby smoothly guiding the rotation of the first side plate 3 and assisting in its upright position. Furthermore, the insertion projection 32 can be smoothly guided into the insertion hole 42, assisting in the assembly of the synthetic resin container 1. Furthermore, when the synthetic resin container 1 is assembled, the side edge 329 near the insertion projection 32 contacts and presses against the first guide 81, which suppresses rattling of the side plates 3 and 4 and prevents deformation of the synthetic resin container 1. In addition, by installing two first guides 81, when the synthetic resin container 1 is assembled, the two first guides 81 contact the side edge 329 equally and support it at two points, thereby further suppressing rattling of the side plates 3 and 4.

[0069] Furthermore, it is preferable that the angle of the tapering of the opposing surface 333 of the tip portion 328 of the insertion projection 32 that faces the first contact guide 811 is different from the angle of the inclination of the side edge 75 of the inclined portion 85 of the first contact guide 811. This configuration reduces friction between the insertion projection 32 and the first contact guide 811, allowing for smoother rotation of the first side plate 3 and expansion of the second side plate 4.

[0070] Furthermore, although not shown in the diagram, the first guide may be formed not on the transverse rib 407, but as a projection directly formed on the inner surface 40 of the second side plate 4. The projection formed directly on the inner surface 40 can be configured in the same way as the projection formed on the transverse rib 407 as described above, such as having the same shape and installation position. In addition, the first guide may consist of a mixture of guides formed on the transverse rib 407 and guides formed directly on the inner surface 40.

[0071] Furthermore, instead of installing the first guide on the transverse rib 407 and forming it in a flat shape, multiple protrusions may be installed continuously on the inner surface 40 of the second side plate 4 at the same height position on the second side plate 4, with parallel sections formed by installing a series of protrusions of the same length and inclined sections formed by installing protrusions of different lengths. Alternatively, the first guide may be installed continuously on the transverse rib 407 of the second side plate 4, with parallel sections formed by installing a series of protrusions of the same length and inclined sections formed by installing a series of protrusions of different lengths. The distance between these protrusions shall be at least less than or equal to the sum of the length of the insertion protrusion 32 and the thickness of the side edge 329, and less than or equal to the thickness of the side edge 329 so that the side edge 329 contacts the first guide when the synthetic resin container 1 is assembled.

[0072] The first guide may have side edges 75, 76 of the inclined portion 85 and / or parallel portion 86 that face the inner surface 40, i.e., the edges that contact the insertion projection 32 and / or side edge 329, which are not straight in plan view but may be wavy, sawtooth, or other uneven surfaces. However, the pitch of the unevenness shall be at least less than or equal to the sum of the length of the insertion projection 32 and the thickness of the side edge 329, and shall be less than or equal to the thickness of the side edge 329 so that the side edge 329 contacts the first guide when the synthetic resin container 1 is assembled. Furthermore, the first guide may have a mixture of guides with straight side edges 75, 56 facing the inner surface 40 and guides with uneven surfaces in plan view. The side edges 75, 76 of the first guide 81 may be planar, or they may be linear, tapering inward.

[0073] The first guide is not flat, and the side edges of the inclined portion 85 and / or parallel portion 86 facing the inner surface 40 are not straight in side view, but have curved or bent portions, and may include uneven portions such as wavy, sawtooth, curved, or bent shapes in side view. Furthermore, the first guide may be a mixture of flat and curved or bent shapes, and guides with straight side edges and uneven edges in side view. Furthermore, the first guide may have the above-described uneven shape in both plan view and side view.

[0074] Furthermore, the first guide may be configured such that the tip of the inclined portion 85 is connected to the frame portion 47 without the parallel portion 86. However, it is preferable to provide the parallel portion 86 because, when the first side plate 3 rotates, the parallel portion 86 makes line or surface contact with the side surface of the insertion projection 32, rather than point contact. Additionally, when the synthetic resin container 1 is assembled, the parallel portion 86 makes surface contact with the side edge portion 329, thereby more reliably suppressing rattling of the side plates 3 and 4. Also, although the inclined portion 85 is configured as a straight line in plan view, it may be a concave or convex curve.

[0075] Furthermore, the vertical width of the first guide is not particularly limited, but is preferably greater than or equal to the vertical width L of the insertion projection 32, and is configured so that as wide an area as possible of the side surface of the insertion projection 32 and the side edge 329 contacts the guide when the first side plate 3 is rotated and when the synthetic resin container 1 is assembled. When three or more first guides are installed, the distance between the uppermost guide and the lowermost guide may be less than or equal to the vertical width L of the insertion projection 32, and the guides may be configured so that the insertion projection 32 contacts all of the first guides when the first side plate 3 is rotated.

[0076] Furthermore, the first guide does not have to be parallel to the bottom surface 2 when the synthetic resin container 1 is assembled, and if multiple first guides are provided, they do not have to be parallel to each other. In these cases, the first guide may be perpendicular to the second side plate 4 or not, and if it is perpendicular, the first guide may be horizontal or not. Also, when the synthetic resin container 1 is assembled, there may be a mixture of guides that are parallel to the bottom surface 2 and guides that are not parallel to the bottom surface 2.

[0077] Furthermore, the first guide does not necessarily have to be connected to the frame portion 47, but it is sufficient if it is configured to contact the insertion projection 32 and / or the side edge portion 329 of the first side plate 3 when the first side plate 3 rotates, and to contact the side edge portion 329 of the first side plate 3 when the synthetic resin container 1 is assembled. If the first guide is not connected to the frame portion 47 and there is a gap between the first guide and the frame portion 47, it is preferable that the distance of the gap be at least less than or equal to the sum of the length of the insertion projection 32 and the thickness of the side edge portion 329 so that the first guide and the insertion projection 32 or the side edge portion 329 are always in contact, and also preferable that the distance be less than or equal to the thickness of the side edge portion 329 so that the side edge portion 329 contacts the first guide when the synthetic resin container 1 is assembled. Furthermore, the first guide may consist of a mixture of guides that are connected to the frame portion 47 and guides that are not connected to the frame portion 47. Moreover, the first guide may consist of a mixture of the shapes described above.

[0078] The second guide 82 is configured to guide the rotation of the first side plate 3 and to assist in guiding the insertion projection 32 into the insertion hole 42. The second guide 82 is located below the first guide and below the lock projection 401, and is configured to contact the side edge 329 of the first side plate 3 when the first side plate 3 rotates, and to contact the side edge 329 when the synthetic resin container 1 is assembled. The second guide 82 is located below the frame 47 and the insertion hole 42, is not connected to the circumferential ends of the frame 47 and the insertion hole 42, and is located outside the rotational trajectory of the insertion projection 32, so it does not contact the insertion projection 32 when the first side plate 3 rotates. Its other configurations can be the same as those of the first guide 81 described above.

[0079] Specifically, as clearly shown in Figure 4, the second guide 82 is installed at both ends of the inner surface 40 of the second side plate 4, and at the corners of the extensions 41 that extend from the second side plate 4 and its both ends. Furthermore, the second guide 82 is composed of a flat plate-shaped projection that protrudes from the inner surface 40 of the second side plate 4. More specifically, the flat plate-shaped projection is installed on a transverse rib 407 provided on the inner surface 40 of the second side plate 4, which is parallel to the bottom surface 2 when assembled, that is, the transverse rib 407 is extended in the inward direction of the synthetic resin container 1. The second guide 82 protrudes horizontally when the synthetic resin container 1 is assembled and is straight in side view. The second guide 82 is installed in a position where it does not come into contact with the insertion projection 32 when the first side plate 3 rotates, but comes into contact with the side edge 329 of the first side plate 3.

[0080] Furthermore, the second guide 82 is configured such that the transverse rib 407 gradually expands and protrudes inward from the center of the second side plate 4 toward the side end, that is, toward the extension portion 41, toward the inside of the synthetic resin container 1, forming an inclined portion 850. In addition, the second guide 82 is configured such that the inclined portion 850 has a parallel portion 860 that is parallel to the inner surface 40 of the second side plate 4, extending from the tip of the inclined portion 850 toward the side end of the second side plate 4 and toward the frame portion 47.

[0081] More specifically, the second guide 82 is configured as follows: in plan view, it is linearly inclined from the second side plate 4 toward the inside of the synthetic resin container 1 and has an inclined portion 850 having a side edge 77 that is not parallel to the inner surface 40 of the second side plate 4 and whose distance from the inner surface 40 changes; and extending from the tip of the inclined portion 850 toward the extension portion 41, it has a parallel portion 860 having a side edge 78 that is parallel to the inner surface 40 of the second side plate 4 and whose distance from the inner surface 40 does not change. Furthermore, the tip of the parallel portion 860 is not in contact with the frame portion 47 and the insertion hole 42, but is connected to the extension portion 41.

[0082] Furthermore, the second guide 82 is flat and straight in side view. Also, the first guide 81 and the second guide 82 protrude inward in the same shape and overlap perfectly in plan view. In addition, the tip of the parallel portion 860 of the second guide 82 may be connected to a rib provided on the extension portion 41.

[0083] With this configuration, at the final stage of rotation of the first side plate 3, the side edge 329 of the first side plate 3 contacts the second guide 82, pushing the second side plate 4 outward. This allows the first side plate 3 to rotate smoothly without contacting the second side plate 4 except for the second guide 82 and the first guide 81. It also helps to smoothly guide the insertion projection 32 into the insertion hole 42. Furthermore, when the synthetic resin container 1 is assembled, the side edge 329 presses against the second guide 82, suppressing rattling of the side plates 3 and 4.

[0084] In the illustrated embodiment, the second guide 82 is installed at one end of each side of the second side plate 4 using a single transverse rib 407. The second guide 82 is installed at an intermediate position in the height of the second side plate 4. The installation position and number of the second guide 82 are not particularly limited, and two or more may be installed at one end of the second side plate 4. When two or more second guides 82 are installed, they may be installed only in the portion above the intermediate position in the height of the second side plate 4, only in the portion below the intermediate position in the height of the second side plate 4, or in both the upper and lower portions above the intermediate position in the height of the second side plate 4.

[0085] Furthermore, although not shown in the diagram, the second guide may be formed not on the transverse rib 407, but as a projection formed on the inner surface 40 of the second side plate 4. The projection formed directly on the inner surface 40 can be configured in the same way as the projection formed on the transverse rib 407 as described above, such as having the same shape and installation position. The tip of the parallel portion of the projection does not contact the frame portion 47 or the insertion hole 42, but is connected to the rib connected to the extension portion 41. In this way, the projection acting as the second guide is positioned so that it does not contact the insertion projection 32 when the first side plate 3 rotates, but contacts the side edge portion 329 of the first side plate 3. If there are multiple second guides, a mixture of guides formed on the transverse rib 407 and guides formed directly on the inner surface 40 may be used.

[0086] Furthermore, instead of installing the second guide on the transverse rib 407 and forming it as a flat plate, the second guide may be constructed by installing multiple protrusions on the inner surface 40 of the second side plate 4 in a continuous manner at the same height on the second side plate 4, with a parallel section formed by installing a continuous series of protrusions of the same length and an inclined section formed by installing a continuous series of protrusions of different lengths. Alternatively, the second guide may be constructed by installing multiple protrusions in a continuous manner on the transverse rib 407 of the second side plate 4, with a parallel section formed by installing a continuous series of protrusions of the same length and an inclined section formed by installing a continuous series of protrusions of different lengths. The distance between these protrusions shall be at least the thickness of the side edge 329 so that the side edge 329 contacts the second guide.

[0087] The second guide may have side edges 77, 78 of the inclined portion 850 and / or parallel portion 860 that face the inner surface 40, i.e., the edges that contact the side edge portion 329, which are not straight in plan view but may have a wavy, sawtooth, or other uneven surface. However, the pitch of the unevenness shall be at least the length of the side edge portion 329 so that the side edge portion 329 contacts the second guide. Furthermore, the second guide may have a mixture of guides with straight side edges and guides with uneven surface that face the inner surface 40 in plan view.

[0088] The second guide is not flat, and the side edges 77, 78 of the inclined portion 850 and / or parallel portion 860 facing the inner surface 40 are not straight in side view, but have curved or bent portions, and may include uneven portions such as wavy, sawtooth, curved, or bent shapes in side view. Furthermore, the second guide may be a mixture of flat and curved or bent shapes, and guides with straight side edges and uneven surfaces in side view. Furthermore, the second guide may have the above-described uneven shape in both plan view and side view.

[0089] Furthermore, the second guide may be configured such that the tip of the inclined portion 850 is connected to the extension portion 41 or a rib connected to the extension portion 41, without the parallel portion 860. However, it is preferable to provide the parallel portion 860 because, when the first side plate 3 rotates, the parallel portion 860 makes line contact or surface contact with the side edge portion 329 of the first side plate 3, rather than point contact. Moreover, when the synthetic resin container 1 is assembled, the parallel portion 860 makes surface contact with the side edge portion 329, thereby more reliably suppressing rattling of the side plates 3 and 4. In addition, although the inclined portion 850 is configured as a straight line in plan view, it may also be a concave curve or a convex curve.

[0090] Furthermore, the second guide does not have to be parallel to the bottom surface 2 when the synthetic resin container 1 is assembled, and if multiple second guides are provided, they may or may not be parallel to each other. In these cases, the first guide may be perpendicular to the second side plate 4 or not, and if it is perpendicular, the first guide may be horizontal or not. Also, when the synthetic resin container 1 is assembled, there may be a mixture of guides that are parallel to the bottom surface 2 and guides that are not parallel to the bottom surface 2.

[0091] Furthermore, the second guide does not necessarily have to be connected to the extension 41 or the rib connected to the extension 41. It is sufficient if the second guide is positioned on the rotational trajectory of the side edge 329 when the first side plate 3 rotates, and contacts the side edge 329 of the first side plate 3, and also contacts the side edge 329 of the first side plate 3 when the synthetic resin container 1 is assembled. In addition, if the second guide is not connected to the extension 41 or the rib connected to the extension 41, and there is a gap between the second guide and the extension 41 or the rib connected to the extension 41, it is preferable that the distance of the gap be at least the thickness of the side edge 329 so that contact is always maintained from the time the second guide and the side edge 329 begin to contact until the synthetic resin container 1 is assembled. It is also preferable that the distance of the gap be at least the thickness of the side edge 329 so that the side edge 329 contacts the first guide when the synthetic resin container 1 is assembled. Furthermore, the second guide may consist of a mixture of guides that are connected to the extension 41 or the rib connected to the extension 41 and guides that are not connected. Furthermore, the second guide may contain a mixture of the shapes described above.

[0092] Furthermore, while a first guide 81 and a second guide 82 are provided as guide 8, it is also possible to provide only one of them. In addition, the guides may be placed on the track of the side edge 329 of the first side plate 3 when the first side plate 3 rotates upward, not at the corners of the extensions 41 that extend from the second side plate 4 and both of its ends. Furthermore, it is possible to provide both the guides at the corners of the extensions 41 and the guides at positions other than the corners of the extensions 41, or to provide only one of them. In addition, a guide may be provided at the upper end of the second side plate 4, above the lock projection 401, where the frame portion 47 does not exist on the extension line.

[0093] In addition to the guide 8, an auxiliary guide 9 may be installed, as shown in Figure 4, to assist the function of the guide 8 and guide the rotation of the first side plate. The auxiliary guide 9 is composed of a vertical rib 409 that extends from the side end of the second side plate 4 of the first guide 81 in a direction perpendicular to the first guide 81 or in a direction intersecting the first guide 81. More specifically, the auxiliary guide 9 is composed of a vertical rib 409 that connects the first guide 81 and a horizontal rib 407 located above the first guide 81 with the insertion hole 42 in between. This vertical rib 409 is in contact with the insertion hole 42 and is also a rib that constitutes the frame 47.

[0094] Thus, the auxiliary guide 9 is configured to contact the insertion projection 32 and the side edge 329 of the first side plate 3 when the first side plate 3 rotates, and to contact the side edge 329 when the synthetic resin container 1 is assembled. Furthermore, the auxiliary guide 9 is also configured to guide the insertion projection 32 into the insertion hole 42. In addition, to prevent the formation of unnecessary corners at the upper or lower end of the auxiliary guide 9, it is preferable that the first guide 81 and the transverse rib 407 above the first guide 81 extend in the same shape to the inside of the synthetic resin container 1 and overlap perfectly in a plan view.

[0095] By configuring the auxiliary guide 9 in this way, at the final stage of rotation of the first side plate 3, the insertion projection 32 and the side edge 329 of the first side plate 3 come into contact with the auxiliary guide 9, guiding the first side plate 3 in the direction and position it should rotate, thereby smoothly guiding the rotation of the first side plate 3 and assisting in its upright position. Furthermore, the insertion projection 32 can be smoothly guided into the insertion hole 42, assisting in the assembly of the synthetic resin container 1. Moreover, when the synthetic resin container 1 is assembled, the side edge 329 near the insertion projection 32 comes into contact with the auxiliary guide 9, pressing against it and suppressing rattling of the side plates 3 and 4, as well as preventing deformation of the synthetic resin container 1.

[0096] Next, the assembly method of the synthetic resin container 1, and the operation of the first engaging part 5, the second engaging part 6, the locking mechanism 7, and the guide 8 will be explained. For the first guide 81, a configuration in which a first contact guide 811 and a first non-contact guide 812 are installed will be used as an example. When assembling the synthetic resin container 1, first, starting from a state where the four side plates are folded on the bottom plate 2, the upper ends of the opposing long-side second side plates 4, 4 are lifted up and rotated around the axis 21, raising them upright while drawing an arc at the upper ends. Then, the upper ends of the opposing short-side first side plates 3, 3 are lifted up and rotated around the axis 21, raising them upright while drawing an arc at the upper ends.

[0097] As the upper ends of the first side plates 3,3 approach the extensions 41 of the second side plates 4,4, the first side plate 3 reaches the final stage of rotation, and its side edge 329 contacts the side edge 77 of the inclined portion 850 of the second guide 82, gradually pushing the area around the second guide 82 of the second side plate 4 outward. Furthermore, as the first side plate 3 is rotated and raised, the insertion projection 32 and / or side edge 329 of the first side plate 3 contact the side edge 75 of the inclined portion 85 of the first guide 81. More specifically, the opposing surface 333 of the tip 328 of the insertion projection 32 contacts the side edge 75 of the inclined portion 85 of the first contact guide 811, causing the insertion projection 32 to contact the first contact guide 811. Subsequently, the side edge 329 contacts the first contact guide 811 and the first non-contact guide 812, gradually pushing the area around the first guide 81 of the second side plate 4 outward. In this process, the first side plate 3 does not come into contact with the second side plate 4 except for the second guide 82 and the first guide 81, allowing the first side plate 3 to rotate smoothly. Then, the insertion projection 32 is guided by the first contact guide 811 and inserted into the insertion hole 42.

[0098] Simultaneously, as the upper ends of the first side plates 3,3 approach the extensions 41 of the second side plates 4,4, the engaging projection 362 protruding from the tip of the operating section 361 contacts the rear surface 418 of the locking projection 401. Furthermore, when the first side plates 3,3 are rotated, the engaging projection 362 and the locking projection 401 act as springs with each other, causing the engaging projection 362 to push up the locking projection 401 and the locking projection 401 to push down the engaging projection 362. At this time, the rear surface 418 of the locking projection 401 is inclined downward toward the tip surface 419, and furthermore, the front surface 366 of the engaging projection 362 is inclined backward toward upward, so even with a weak force, the locking projection 401 can be pushed up and the engaging projection 362 can be pushed down due to the spring action between them.

[0099] Then, as the engaging projection 362 slides past the front end surface 419 while contacting the rear surface 418 of the lock projection 401, the spring action of the lock projection 401 lowers the lock projection 401, and conversely, the engaging projection 362 is raised, causing the engaging projection 362 to wrap around to the front end surface 419 side of the lock projection 401. In this way, the engaging projection 362 is positioned between the front end surface 419 of the lock projection 401 and the inner surface 49 of the extension 41 and engages with the lock projection 401.

[0100] Furthermore, when the first side plates 3,3 are rotated and raised, the second engaging portion 6 is engaged. That is, as the first side plates 3,3 rotate and rise, the engaging projections 33 that constitute the second engaging portion 6 are inserted into the engaging recesses 44 provided on the extension portion 41 of the second side plate 4, and sequentially engage with the engaging plates 43 of the second side plates 4,4 from below. Next, the insertion projections 32 protruding from both ends of the first side plates 3,3 are inserted into the insertion holes 42 provided in the second side plates 4,4, and fit and engage.

[0101] Then, the engaging projection 362 and the locking projection 401 engage, and the engaging projection 33 is inserted into the engaging recess 44 and engages, at the same time the insertion projection 32 is fully inserted into the insertion hole 42, and the synthetic resin container 1 is in the assembled state. At this time, the side edge 329 of the first side plate 3 maintains contact with the first guide 81 of the second side plate 4 and presses against it, and the side edge 329 of the first side plate 3 maintains contact with the second guide 82 of the second side plate 4 and presses against it, which suppresses rattling of the side plates 3 and 4 and prevents deformation of the synthetic resin container 1.

[0102] In this way, the synthetic resin container 1 can be assembled very easily simply by raising the second side plates 4,4 on the longer side and then raising the first side plates 3,3 on the shorter side. Moreover, the adjacent first side plate 3 and second side plate 4 are firmly engaged, there is no rattling of the side plates 3,4, and deformation of the synthetic resin container 1 can be prevented.

[0103] Next, to release the lock and fold the synthetic resin container 1, the operating part 361 of the locking member 36 is pressed down (in the direction of arrow B) to release the engagement between the engaging projection 362 and the locking projection 401. To release the engagement between the engaging projection 362 and the locking projection 401, a finger is placed in the finger-holding recess 364 of the locking member 36 and pushed down against the upward biasing force of the spring 37. At the same time, the engaging projection 362 protruding from the tip is also pushed down, so that the upper surface of the engaging projection 362 is pushed down below the lower surface of the locking projection 401, and the engagement between the engaging projection 362 and the locking projection 401 is released.

[0104] If the engagement between the engaging projection 362 and the locking projection 401 is released, the first side plates 3,3 can be rotated and folded inward, the opposite of the assembly process. Therefore, while pressing down the locking member 36, the first side plates 3,3 are folded inward and pulled down, rotated around the shaft 21, and folded inward in an arc at the upper end, stacking them on the bottom plate 2. If the fingers are released from the finger-holding recess 364 of the locking member 36 and the downward pressure is stopped while folding down the first side plates 3,3, the locking member 36 will return to its original position due to the biasing force of the spring 37. After that, the upper ends of the second side plates 4,4 are held and pulled inward, rotated around the shaft 21, and folded inward in an arc at the upper end, stacking them on the side plate 3 to create the folded state. In this way, the synthetic resin container 1 can be easily folded.

[0105] In the above embodiment, the synthetic resin container 1 is configured to include a first engaging portion 5, a second engaging portion 6, and a locking mechanism 7. However, the synthetic resin container may be configured to omit the second engaging portion 6 and consist only of the first engaging portion and the locking mechanism.

[0106] Furthermore, in the above embodiment, when folding, the first side panel that is folded first is the side panel on the shorter side, and the second side panel that is folded later is the side panel on the longer side. However, the first side panel that is folded first may be the side panel on the longer side, and the second side panel that is folded later may be the side panel on the shorter side. Alternatively, the base plate may be square, and the horizontal lengths of the first side panel that is folded first and the second side panel that is folded later, i.e., the four side panels, may be the same length. [Industrial applicability]

[0107] As described above, the synthetic resin container of the present invention is of the assembly type, the side panels can be raised easily and smoothly, and it can be assembled easily. Moreover, in the assembled state, rattling of the container itself and the side panels, as well as deformation of the container, can be reduced, so it can be used in many industries that need to transport goods, such as logistics. [Explanation of Symbols]

[0108] 1. Container made of synthetic resin 2 Bottom plate 3 First side plate 32 Insertion projection 329 Side edge 33 Engagement protrusion 36 Locking member 362 Engaging projection 37 Springs 4 Second side plate 41 Extension 42 Insertion holes 43 Engagement plate 44 Engagement recess 45 Plates 47 Frame section 401 Locking protrusion 407 Transverse Rib 5 First engaging part 6 Second engaging part 7. Locking mechanism 8 Guides 81 First Guide 811 First Contact Guide 812 First Contactless Guide 82 Second Guide 85 Slope 850 Slope 86 Parallel section 860 Parallel section 9. Supplementary Guide

Claims

1. An assembly-type synthetic resin container characterized by a rectangular base plate in plan view, and four side plates rotatably mounted on the four side ends of the base plate, comprising a pair of opposing first side plates that are raised later during assembly, and another pair of opposing second side plates that are raised earlier, with guides provided on the inner surfaces of the second side plates to guide the rotation of the first side plates.

2. An assembly-type synthetic resin container characterized by a rectangular base plate in plan view, and four side plates rotatably mounted on the side ends of the four sides of the base plate, comprising a pair of opposing first side plates that are raised later during assembly, and another pair of opposing second side plates that are raised earlier, with guides provided on both ends of the inner surface of the second side plates to guide the rotation of the first side plates.

3. The assembly-type synthetic resin container according to claim 1, characterized in that the guide is composed of a projection protruding from the inner surface of the second side plate and has an inclined portion that gradually expands inward toward the inside of the synthetic resin container from the center direction toward the side edge of the second side plate.

4. The assembly-type synthetic resin container according to claim 2, characterized in that the guide is composed of a projection protruding from the inner surface of the second side plate and has an inclined portion that gradually expands inward toward the inside of the synthetic resin container from the center of the second side plate toward the side edge.

5. The assembly-type synthetic resin container according to claim 1, characterized in that the guide is composed of a projection protruding from the inner surface of the second side plate, and has an inclined portion that gradually expands toward the inside of the synthetic resin container from the center of the second side plate toward the side edge, and has a parallel portion that is parallel to the inner surface of the second side plate toward the side edge of the second side plate from the tip of the inclined portion.

6. The assembly-type synthetic resin container according to claim 2, characterized in that the guide is composed of a projection protruding from the inner surface of the second side plate, and has an inclined portion that gradually expands inward toward the inside of the synthetic resin container from the center of the second side plate toward the side edge, and has a parallel portion that is parallel to the inner surface of the second side plate toward the side edge of the second side plate from the tip of the inclined portion.

7. The assembly-type synthetic resin container according to any one of claims 3 to 6, characterized in that the guide is configured such that the projection is installed on a transverse rib provided on the inner surface of the second side plate.

8. The assembly-type synthetic resin container according to any one of claims 1 to 6, characterized in that the guide is installed in a position that contacts the first side plate when the first side plate is rotated and when the synthetic resin container is in an assembled state.

9. The assembly-type synthetic resin container according to claim 7, characterized in that the guide is installed in a position that contacts the first side plate when the first side plate is rotated and when the synthetic resin container is assembled.

10. The assembly-type synthetic resin container according to any one of claims 1 to 6, characterized in that the guide is one or more guides selected from a first guide installed at the upper end of the second side plate and a second guide installed below the first guide.

11. The assembly-type synthetic resin container according to claim 10, characterized in that an auxiliary guide is installed on the side end of the second side plate of the first guide, extending in a direction intersecting the first guide, for guiding the rotation of the first side plate.

12. The synthetic resin container, in its assembled state, is equipped with one or more selected from a first engaging portion, a second engaging portion, and a locking mechanism for preventing the rotation of the side plate, the first engaging portion comprising an insertion projection provided on the first side plate and an insertion hole provided on the second side plate, the insertion projection provided on the upper part of the outer surface of the side edge of the first side plate, the insertion hole provided on the upper part of an extension extending inward from both ends of the second side plate, and in the assembled state of the synthetic resin container, the insertion projection can be inserted, the second engaging portion comprising an engaging projection formed to protrude outward from both ends of the first side plate and an engaging recess opening inward from the extension of the second side plate, and the container The assembled synthetic resin container according to any one of claims 1 to 6, characterized in that, in the assembled state, the engaging projection is positioned to be inserted into the engaging recess, the locking mechanism comprises locking projections provided on both ends of the second side plate and a locking member installed on the first side plate, the locking projection is configured to protrude inward from spring-loaded plates formed on both ends of the second side plate toward the inside of the synthetic resin container, and the locking member is installed on the upper outer part of the first side plate and comprises an operating part, an engaging projection protruding from the tip of the operating part that engages with the locking projection, and a spring provided on the lower surface of the operating part that biases the locking member upward.

13. The assembly-type synthetic resin container according to claim 12, characterized in that the guide is one or more guides selected from among the first guides provided at the upper end of the second side plate, which come into contact with the insertion projection when the first side plate rotates; a first non-contact guide from the first guides that do not come into contact with the insertion projection when the first side plate rotates; and a second guide provided below the first guides that do not come into contact with the insertion projection when the first side plate rotates.

14. The assembled synthetic resin container according to claim 13, characterized in that an auxiliary guide is provided on the side end of the second side plate of the first contact guide and / or the first non-contact guide, extending in a direction intersecting the first guide, for guiding the rotation of the first side plate.

15. The assembly-type synthetic resin container according to claim 13, further comprising the first engaging portion, the second engaging portion, and the locking mechanism, as well as the first non-contact guide and the second guide.

16. The assembly-type synthetic resin container according to claim 13, characterized in that the first contact guide is positioned to contact the insertion projection and the side edge of the first side plate when the first side plate rotates, and to contact the side edge when the synthetic resin container is assembled.

17. The assembled synthetic resin container according to claim 13, characterized in that the first non-contact guide is installed in a position that contacts the side edge of the first side plate when the first side plate is rotated and / or when the synthetic resin container is assembled.

18. The assembly-type synthetic resin container according to claim 13, characterized in that the second guide is installed at a position that contacts the side edge of the first side plate when the first side plate is rotated and / or when the synthetic resin container is assembled.

19. The assembly-type synthetic resin container according to claim 13, characterized in that the angle of the tapering of the opposing surface of the tip of the insertion projection that faces the first contact guide is different from the angle of inclination of the side edge of the inclined portion of the first contact guide.

20. A method for assembling a synthetic resin container, comprising a rectangular base plate in plan view and four side plates rotatably mounted on the four side ends of the base plate, wherein the container comprises a pair of opposing first side plates that are raised later during assembly and another pair of opposing second side plates that are raised earlier, and the inner surface of the second side plates is provided with guides for guiding the rotation of the first side plates, characterized in that when raising the first side plates, the first side plates are brought into contact with the guides and the second side plates are pushed outward during assembly.

21. The assembly method for a modular synthetic resin container according to claim 20, characterized in that, when assembled, the first side plate maintains contact with the guide of the second side plate, causing the first side plate and the guide of the second side plate to press against each other.

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