Container made of synthetic resin

Abstract

One of the purposes is to smoothly raise the side plates that are raised later during the assembly of the assembled synthetic resin container. Another purpose is to reduce rattling between the synthetic resin containers and the side plates in the assembled state of the assembled synthetic resin container. 【Solution means】A bottom plate 2 that is square in plan view, and four side plates rotatably installed at the side ends of the four sides of the bottom plate 2. During assembly, a pair of first side plates 3, 3 that are opposed and raised later, and another pair of second side plates 4, 4 that are opposed and raised first are provided. Guides 8 for guiding the rotation of the first side plates 3 are installed at both side ends of the inner surface 40 of the second side plates 4. An assembled synthetic resin container 1.

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 container is assembled by engaging adjacent side plates with each other with the side plates erected, and is folded inward by releasing the engaged state of the side plates. An assembled synthetic resin container is used. The synthetic resin container is excellent in durability, can be repeatedly used, and is widely used instead of cardboard boxes from the viewpoint of resource saving.

[0003] As such a synthetic resin container, for example, it is composed of a planar square bottom plate 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 engaged 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 is placed on a horizontal rib provided on the side plate and biases the operation portion upward is protruded on the lower surface. A synthetic resin container has been proposed (Patent Document 1).

[0004] Further, first engaging portions and second engaging portions are provided at both end portions of adjacent side plates so as to prevent the adjacent side plates from rotating outward when assembled. The first engaging portion includes a locking protrusion formed by a base protruding in the same direction as the inner surface at both end portions of the inner surface of the side plate to be folded first and an insertion portion protruding in a direction perpendicular to the base, and a rectangular frame portion is provided on the inner surface of an extension portion protruding in a right direction from both end portions of the side plate to be folded later to the outside of the side plate. A through hole formed in the frame portion is provided by providing a notch in the extension portion of the portion provided with the frame portion, and the locking protrusion is formed to be inserted into the through hole. The second engaging portion includes a substantially L-shaped protrusion projecting from both ends of the side plate to be folded first and an engaging plate projecting inward in parallel with the inner surface of the side plate from an extension portion extending in a right direction from both end portions of the side plate to be folded later. The substantially L-shaped protrusion is formed to engage with the engaging plate. A thickness dimension of the rectangular frame portion provided on the side plate to be folded later is formed to be larger than a protruding width dimension of the engaging plate in the second engaging portion. An assembled synthetic resin container has been proposed (Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the synthetic resin containers described in Patent Document 1 and Patent Document 2, a frame portion is provided on the inner surface of the upper end portion of an extension portion protruding in a right direction from both end portions of the side plate on the long side to be folded later to the outside of the side plate, a square through hole is formed, and locking protrusions formed at both end portions of the inner surface of the side plate on the short side to be folded first are inserted into the through hole to prevent the side plate on the long side from rotating outward and engage adjacent side plates to prevent the container from disassembling.

[0007] With such a configuration, when assembling the container, the side plate on the long side is raised first, and the locking projection of the side plate on the short side, which is raised later, is inserted into the through hole at the upper end of the side plate on the long side. However, when inserting, the side plate on the long side is not positioned, and the locking projection is not fixed at a position where it can be inserted into the through hole. Therefore, there is a problem that the locking projection contacts the edge or frame portion of the through hole, and the locking projection cannot be smoothly inserted into the through hole. Also, if the side plate on the long side is tilted inward even slightly or is perpendicular to the bottom plate, when the side plate on the short side, which is raised later, is raised, it contacts the side plate on the long side, and the raising of the side plate on the short side, which is raised later, cannot be smoothly performed, and there is also a problem that the locking projection cannot be smoothly inserted into the through hole.

[0008] Also, in the assembled state where the locking projection is inserted into the through hole, due to the configuration of rotating the locking projection and inserting it into the through hole, there is a gap between the locking projection and the through hole. Therefore, there are also problems such as the synthetic resin container and the side plates being prone to rattling, and the container being prone to deformation.

[0009] Therefore, one of the objectives of the present invention is to avoid contact with the side plate that has been raised first when raising the side plate that is raised later when assembling an assembled synthetic resin container, so as to smoothly raise the side plate that is raised later. Also, one of the objectives is to smoothly insert the locking projection of the side plate that is raised later into the through hole of the side plate that has been raised first when assembling an assembled synthetic resin container. Also, one of the objectives is to reduce the rattling between the synthetic resin container and the side plates in the assembled state of the assembled synthetic resin container. Also, one of the objectives is to prevent deformation of the synthetic resin container in the assembled state of the assembled synthetic resin container.

Means for Solving the Problems

[0010] The present invention as a means for solving the above problems is an assembled synthetic resin container including a bottom plate rectangular in plan view, and four side plates rotatably installed at the side end portions of the four sides of the bottom plate. When assembling, the container includes a pair of first side plates that are erected later and another pair of second side plates that are erected earlier and face each other, and a guide for guiding the rotation of the first side plate is installed on the inner surface of the second side plate.

[0011] Furthermore, the present invention is an assembled synthetic resin container including a bottom plate rectangular in plan view, and four side plates rotatably installed at the side end portions of the four sides of the bottom plate. When assembling, the container includes a pair of first side plates that are erected later and another pair of second side plates that are erected earlier and face each other, and guides for guiding the rotation of the first side plate are installed at both side end portions of the inner surface of the second side plate.

[0012] Furthermore, in the above synthetic resin container, the guide is constituted by a protrusion protruding from the inner surface of the second side plate, and the guide has an inclined portion that gradually expands in the inner direction of the synthetic resin container from the center direction of the second side plate toward the side end. It is an assembled synthetic resin container.

[0013] Furthermore, in the above synthetic resin container, the guide is constituted by a protrusion protruding from the inner surface of the second side plate, and the guide has an inclined portion that gradually expands in the inner direction of the synthetic resin container from the center direction of the second side plate toward the side end. In addition, the guide has a parallel portion parallel to the inner surface of the second side plate from the tip of the inclined portion toward the side end of the second side plate. It is an assembled synthetic resin container.

[0014] Furthermore, in the above synthetic resin container, the guide is constituted by installing the protrusion on a horizontal rib provided on the inner surface of the second side plate. It is an assembled synthetic resin container.

[0015] Furthermore, in the above synthetic resin container, the guide is installed at a position where it contacts the first side plate when the first side plate rotates and when the synthetic resin container is in an assembled state. It is an assembled synthetic resin container.

[0016] Further, in the synthetic resin container, 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, and it is a prefabricated synthetic resin container.

[0017] Further, in the synthetic resin container, an auxiliary guide for guiding the rotation of the first side plate, which extends in a direction intersecting with the first guide, is installed on the side end side of the second side plate of the first guide, and it is a prefabricated synthetic resin container.

[0018] Further, in the synthetic resin container, in the assembled state, the synthetic resin container includes 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. The first engaging portion is composed of an insertion protrusion provided on the first side plate and an insertion hole provided on the second side plate. The insertion protrusion is provided at the upper part of the outer surface of the side edge of the first side plate, and the insertion hole is at the upper part of the extension portion extending inward from both side ends of the second side plate, and is provided at a position where the insertion protrusion can be inserted in the assembled state of the synthetic resin container. The second engaging portion is composed of an engaging protrusion formed to protrude outward at both side ends of the first side plate and an engaging recess opening inward in the extension portion of the second side plate, and is provided at a position where the engaging protrusion is inserted into the engaging recess in the assembled state of the container. The locking mechanism is composed of locking protrusions provided at both side ends of the second side plate and a locking member installed on the first side plate. The locking protrusions are formed to protrude inward from the synthetic resin container from plates having a spring action formed at both side ends of the second side plate. The locking member is installed at the upper part outside the first side plate and includes an operation portion, an engaging tab protruding from the tip of the operation portion and engaging with the locking protrusion, and a spring provided on the lower surface of the operation portion and having an action of biasing the locking member upward, and it is a prefabricated synthetic resin container.

[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 that is provided below the first guide and does not contact the insertion protrusion when the first side plate rotates, and 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, which extends in a direction intersecting the first guide, is installed on the side edge side of the second side plate of the first contact guide and / or the first non-contact guide, and 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 is an assembled synthetic resin container including the first non-contact guide and the second guide.

[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 that contacts the side edge portion when the synthetic resin container is in an assembled state, and is an assembled synthetic resin container.

[0023] Further, in the synthetic resin container, the first non-contact guide is installed at a position that contacts 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, and is an assembled synthetic resin container.

[0024] Further, in the synthetic resin container, the second guide is installed at a position that contacts 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, and is an assembled synthetic resin container.

[0025] Further, in the synthetic resin container, the taper angle of the opposing surface of the tip of the insertion protrusion that faces the first contact guide is different from the inclination angle of the side edge of the inclined portion of the first contact guide, which is an assembled synthetic resin container.

[0026] Further, 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. When assembling, a pair of opposing first side plates that are erected later and another pair of opposing second side plates that are erected first are provided. A guide for guiding the rotation of the first side plate is installed on the inner surface of the second side plate. A method for assembling an assembled synthetic resin container, characterized in that when erecting the first side plate, the first side plate is brought into contact with the guide to push and expand the second side plate outward for assembly.

[0027] Further, in the method for assembling the synthetic resin container, in the assembled state, the first side plate maintains contact with the guide of the second side plate, and the first side plate and the guide of the second side plate are pressed against each other. This 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 plate that is erected later, it is possible to avoid contact with the side plate that was erected earlier and smoothly erect the side plate that is erected later. Also, when assembling an assembled synthetic resin container, the locking protrusion of the side plate that is erected later can be smoothly inserted into the through hole of the side plate that was erected earlier. Further, 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

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0030] The synthetic resin container of the present invention is an assembled synthetic resin container in which side plates are rotatably installed at each of the four sides of a square bottom plate, and the side plates can be rotated to be in a folded state and an assembled state

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The synthetic resin container 1 of the present invention is configured to include one bottom plate 2 and four side plates 3, 3, 4, 4 as shown in FIGS. 1 and 2. Along the side ends of the four sides of the square bottom plate 2 in plan view, one side plate is installed for each side end. A pair of opposing first side plates 3, 3 that are raised later during assembly and folded first during folding, and a pair of opposing second side plates 4, 4 that are raised first during assembly and folded later during folding are arranged, and it is a container with an open top

[0032] Further, the synthetic resin container 1 is provided with a rotation mechanism 20 for rotatably installing the first side plate 3 and the second side plate 4 on the bottom plate 2. The rotation mechanism 20 includes a shaft 21 provided at the lower end portions of the first side plate 3 and the second side plate 4, and a bearing 22 provided at the side end portion 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 each rotatable about the side end portion of the bottom plate 2. Further, at approximately the center of the upper portion of the first side plate 3 on the short side and at approximately the center of the upper portion of the second side plate 4 on the long side, there are provided handle holes 10 into which fingers are inserted when carrying the synthetic resin container 1.

[0033] In the present 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 in the direction of the bottom plate 2, stacked in parallel with the bottom plate 2 on the bottom plate 2, and then the two second side plates 4, 4 on the long side are folded so as to be stacked on the folded first side plates 3, 3 on the short side. Then, the bearing 22 that supports the second side plate 4 on the long side of the bottom plate 2 is disposed on a height adjustment portion 17 formed to protrude upward from the side end portion of the bottom plate 2 so that the second side plates 4, 4 to be folded later are stacked in parallel with the bottom plate 2 and the first side plate 3. With such a configuration, in the final folded state in which the four first side plates 3, 3 and the second side plates 4, 4 are folded, the whole becomes substantially flat (not shown).

[0034] At both side end portions in the width direction of the first side plate 3 on the short side and the second side plate 4 on the long side that are adjacent to each other in the assembled state of the synthetic resin container 1, when the first side plate 3 and the second side plate 4 are respectively erected and assembled, the first side plate 3 and the second side plate 4 are engaged with each other, and the first side plate 3 and the second side plate 4 are provided with a first engaging portion 5, a second engaging portion 6, and a locking mechanism 7 for preventing rotation and preventing folding. Further, the second side plate 4 to be erected first is provided with a guide 8 for guiding the rotation of the first side plate 3 to be erected later.

[0035] The first engaging portion 5 is a mechanism mainly for preventing the second side plate 4 from rotating outward in the assembled state of the synthetic resin container 1, and is also a mechanism for preventing the first side plate 3 from rotating outward and the second side plate 4 from rotating inward. As shown well in FIGS. 3 and 7, it is configured with an insertion protrusion 32 provided on the first side plate 3 on the short side and an insertion hole 42 provided on the second side plate 4 on the long side into which the insertion protrusion 32 is inserted.

[0036] Also, as shown well in FIGS. 3 and 5, side edge portions 329 are provided that project onto the same plane as the first side plate 3 from both side ends of the first side plate 3 on the short side that is folded first, and overlap with the extension of the second side plate 4 in the assembled state of the synthetic resin container 1.

[0037] Also, as shown well in FIGS. 3 and 4, extensions 41 extend in a direction perpendicular to the second side plate 4 in the inner direction from both side ends of the second side plate 4 on the long side that is folded later, and overlap with the side edge portion 329 of the first side plate 3 in the assembled state of the synthetic resin container 1. And the insertion hole 42 is defined by a frame portion 47 provided at the upper part of the inner surface 49 of the extension 41, and a notch 48 is provided by cutting out the outer surface 410 of the extension 41 at the portion where the frame portion 47 is provided. The frame portion 47 and the notch 48 are open and are formed through the extension 41, that is, the second side plate 4.

[0038] The extension 41 is formed by extending and bending the second side plate 4, abuts against the side edge portion 329 of the first side plate 3 on the short side that is folded first, prevents the first side plate 3 from rotating outward, and is 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 described later. Because of such a 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 shown well in FIGS. 3 and 5, the insertion protrusion 32 projects outward in a direction perpendicular to the side edge portion 329 from the upper part of the outer surface of the side edge portion 329 of the first side plate 3, and is formed in a substantially L shape in plan view with the side edge portion 329. In the assembled state of the synthetic resin container 1, it is provided at a position where it can be inserted into the insertion hole 42. Further, the insertion protrusion 32 is configured to have the same length as the insertion hole 42. In the assembled state of the synthetic resin container 1, the tip surface 320 of the insertion protrusion 32 is located substantially on the same plane as the outer surface 410 of the extension portion 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 protrusion 32 is configured to have the same length as the insertion hole 42, the length of the insertion protrusion 32 inserted into the insertion hole 42 can be increased, and the second side plate 4 on the long side and the side plate 3 on the short side can be reliably engaged.

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

[0042] The insertion protrusion 32 has a square prism for the base portion 327 and a frustum of a square pyramid that tapers toward the tip end for the tip portion 328 so as to be easily inserted into the insertion hole 42. Further, the insertion hole 42 is configured in a square column shape. And the cross-sectional shape of the base portion 327 and the cross-sectional shape of the insertion hole 42 are the same square. Note that the cross-section of the insertion protrusion 32 means the cross-section in a direction perpendicular to the protruding direction, and the cross-section of the insertion hole 42 means the cross-section in a direction orthogonal to the depth direction.

[0043] When the first side plate 3 on the short side is erected and assembled with the second side plate 4 on the long side, the insertion protrusion 32 is inserted into the insertion hole 42 and engages with the insertion hole 42. In this way, by the engagement of the insertion protrusion 32 and the insertion hole 42, the rotation of the second side plate 4 on the long side can be prevented, and the assembled state can be maintained.

[0044] Currently, although the insertion hole 42 is configured to penetrate the second side plate 4, it may be a concave hole that opens only inside the second side plate 4. Also, the insertion protrusion 32 may be configured to have a length shorter than that of the insertion hole 42. Further, the insertion protrusion 32 preferably has a shape that tapers toward the tip direction at least at the tip portion so that it can be smoothly inserted into the insertion hole 42 that rotates and approaches and inserts, but it is not necessary to taper. Currently, although a gap is formed between the two in the state where the insertion protrusion 32 is inserted into the insertion hole 42, it may be configured to be in a tight fit or an intermediate fit state.

[0045] Currently, the insertion protrusion 32 and the insertion hole 42 only need to be configured in a shape such that the insertion protrusion 32 can be inserted into the insertion hole 42, and are not limited to the above shapes, and may be configured as follows. That is, the shapes of the insertion protrusion and the insertion hole are not limited to a square cross-section, and may be a triangular cross-section, other polygons, a circular shape, an elliptical shape, etc. Also, for example, the cross-sectional shapes of the insertion protrusion and the insertion hole may be the same shape other than a square, such as a cylindrical insertion protrusion and a cylindrical insertion hole, or different cross-sectional shapes such as a cross-shaped or square insertion protrusion in plan view and a circular insertion hole. Further, the insertion protrusion may be a column, a frustum of a cone, or a cone with the same or similar cross-sectional shape from the lower end to the upper end. Even if the cross-sectional shapes are similar, it may be configured by combining shapes with different protruding directions, such as a cylindrical base and a semi-circular tip, or a cylindrical base and a square frustum of a cone at the tip. Also, the insertion hole may be a column with the same cross-sectional shape over the entire length, but may also be a tapered frustum or a cone with a tapered shape.

[0046] By configuring the insertion hole 42 to have a circular cross-section, it has no corners, especially no corners at the opening end, and improves the resistance to damage caused by pressing or pulling by the insertion protrusion 32. In the case of such a configuration, the entire length of the insertion hole 42 may be configured as a cylinder, or at least a part including the opening end may be configured as a cylinder. Also, by making at least a part of the insertion protrusion 32 a cylinder, it is less likely to be damaged compared to a square column protrusion.

[0047] The second engaging portion 6 is a mechanism mainly for preventing the second side plate 4 from rotating outward in the assembled state of the synthetic resin container 1. As shown well in FIGS. 3 and 5, engaging protrusions 33 formed to protrude outward are provided on both side edges 329 of the first side plate 3 on the short side, and an engaging recess 44 that opens inward is provided on an extension 41 of the second side plate 4 on the long side.

[0048] The engaging protrusion 33 is configured in a quadrangular prism shape, protrudes outward at a right angle to the side edge 329, that is, in the same direction as the insertion protrusion 32, below the insertion protrusion 32 on the side edge 329 of the first side plate 3, and is formed in a substantially L shape in plan view with the side edge 329. In the assembled state of the synthetic resin container 1, it is provided at a position where it can be inserted into the engaging recess 44.

[0049] Also, as shown well in FIG. 4, on the extension 41 formed by extending at right angles from both side ends of the second side plate 4 on the long side that is later folded, an engaging plate 43 is formed to protrude inward in a direction parallel to the inner surface 40 of the second side plate 4. The overhanging width of the engaging plate 43 is equal to or less than the length of the engaging protrusion 33. In this way, the inner surface 40 of the second side plate 4 on the long side, the extension 41, and the engaging plate 43 form an engaging recess 44 having a substantially U-shaped cross section.

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

[0051] In addition, when the engaging protrusion 33 engages with the engaging plate 43, the number of installations and the shape are not particularly limited. As shown in the figure, a plurality of engaging protrusions 33 may be provided in the vertical direction, but one engaging protrusion 33 may also be provided. Also, they can be integrally formed continuously in the vertical direction, but as shown in FIGS. 3 and 5, it is preferable to configure them by dividing them into a plurality in the vertical direction. Also, although not shown in the figure, the engaging protrusion 33 may be configured to fit into a groove provided on the inner surface 49 of the extension 41.

[0052] The locking mechanism 7 is a mechanism for mainly preventing the first side plate 3 on the short side from rotating in the direction of the bottom plate 2 (inward direction) and falling down, further preventing unintentional release of the assembled state of the synthetic resin container 1, and further smoothly performing intentional release from the assembled state of the synthetic resin container 1 in the assembled state of the synthetic resin container 1 where the second side plate 4 on the long side is erected from the folded state and then the first side plate 3 on the short side is erected. As shown in FIGS. 3 to 5, the locking mechanism 7 includes locking projections 401 having a spring action provided at both side ends of a pair of opposing second side plates 4, 4 to be folded later, and locking members 36 installed on a pair of opposing first side plates 3, 3 to be folded first.

[0053] As shown in FIGS. 3 and 4, the locking projection 401 is formed by protruding from the plates 45 at both side ends of the second side plate 4 in the inner direction of the synthetic resin container 1. Specifically, the plate 45 and the locking projection 401 are formed at both side ends of one second side plate 4. The locking projection 401 is formed by a substantially U-shaped slit 411 on three sides including the upper and lower sides and near the side end of the second side plate 4. One side is connected to the second side plate 4, and the nearer extension part 41 side is the free end. It is the tip part on the free end side of the plate 45 having a spring action and is formed by protruding in the inner direction of the synthetic resin container 1. It is preferable to provide a through hole 46 formed by cutting out the central part on the plate 45.

[0054] The locking projection 401 is formed in a substantially triangular longitudinal section. The upper surface 417 is flush with the upper surface of the plate 45. The rear surface 418 on the side opposite to the extension part 41 is inclined downward in the direction of the extension part 41 and is formed in a tapered shape in side view. The tip surface 419 is formed parallel to the opposing extension part 41. Since the plate 45 is provided with a through hole 46 by cutting out the central part together with the slit 411, it has flexibility, and the locking projection 401 can move in the vertical, horizontal, and left - right directions and has a spring action. Incidentally, although the flexibility and the spring action become weak, it is not necessary to form the through hole 46 on the plate 45.

[0055] The locking member 36 is a member separate from the first side plate 3 and is installed movably on the first side plate 3. As shown well in FIGS. 2, 3, and 5, engaging tabs 362 that engage with the locking protrusions 401 are projected in a direction parallel to the operation portion 361 at both tip ends of the operation portion 361 for an operator to operate to release the assembled state of the synthetic resin container 1. Further, two springs 37 are symmetrically provided on the lower surface of the operation portion 361. The operation portion 361 has the same width as the first side plate 3, and the engaging tabs 362 are configured to overlap the side edge portion 329. Further, the upper portion 366 of the front surface of the engaging tab 362 is inclined rearward upward. A recess 364 for an operator's finger hook is provided on the outer surface of the substantially central portion of the operation portion 361. The spring 37 has an effect of biasing the locking member 36 upward (in the direction of arrow A) and is formed by projecting a leaf spring obliquely downward. The locking member 36 is installed at the upper portion outside the first side plate 3, and the lower end of the spring 37 is located on a rib 392 projecting outside the first side plate 3.

[0056] Furthermore, as shown in FIG. 5, the locking member 36 is installed by inserting a buttock-shaped protrusion 53 provided on the back surface of the operation portion 361 into a slit 51 formed in the first side plate 3. With such a configuration, the locking member 36 is slidable in the vertical direction and does not come off from the first side plate 3.

[0057] In addition, in order to slidably mount the locking member 36 of the first side plate 3 in the vertical direction, contrary to the above configuration, that is, a configuration in which a buttock-shaped protrusion projects on the first side plate 3 side and a slit is provided in the operation portion 361 of the locking member 36 may be adopted. In addition, as long as the locking member 36 is vertically movable, the mounting configuration on the first side plate 3 can be any other structure.

[0058] The guide 8 is configured to guide the rotation of the first side plate 3 and is installed at both side ends of the inner surface 40 of the second side plate 4. The guide 8 has a first guide 81 installed at the upper end portion 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 protrusion 32 into the insertion hole 42. The first guide 81 is provided at the upper end of the second side plate 4, above the locking protrusion 401, and contacts the insertion protrusion 32 or / and the side edge portion 329 of the first side plate 3 when the first side plate 3 rotates, and is configured to contact the side edge portion 329 when the synthetic resin container 1 is in an assembled state.

[0060] As shown well in FIG. 4, the first guide 81 is provided at both side ends of the inner surface 40 of the second side plate 4, at the corners of the second side plate 4 and the extension portions 41 extending from both its side ends, and there is a frame portion 47 on the extension line. Note that the extension line includes both cases where the guide 8 contacts the frame portion 47 and cases where it does not. Also, the first guide 81 is composed of a flat protrusion protruding from the inner surface 40 of the second side plate 4. Specifically, a flat protrusion is installed on the horizontal rib 407 provided on the inner surface 40 of the second side plate 4, which is parallel to the bottom surface 2 in the assembled state. That is, the horizontal rib 407 is expanded in the inner direction of the synthetic resin container 1 to form the first guide 81. The first guide 81 protrudes horizontally in the assembled state of the synthetic resin container 1 and is linear in side view.

[0061] Also, the first guide 81 gradually expands and protrudes the horizontal rib 407 from the center direction of the second side plate 4 towards the side end, that is, towards the extension portion 41, in the inner direction of the synthetic resin container 1 to form an inclined portion 85. Further, a parallel portion 86 parallel to the inner surface 40 of the second side plate 4 is provided from the tip of the inclined portion 85 in the direction of the extension portion 41 towards the side end of the second side plate 4 and the frame portion 47. By providing the inclined portion 85, the insertion protrusion 32 or / and the side edge portion 329 can smoothly contact the first guide 81 without being caught, enabling the rotation of the first side plate 3 to be smooth.

[0062] More specifically, the first guide 81 has an inclined portion 85 that linearly inclines from the second side plate 4 in the inner direction of the synthetic resin container 1 in a plan view, is not parallel to the inner surface 40 of the second side plate 4, and has a side edge 75 whose distance from the inner surface changes. The inclined portion 85 is provided with a parallel portion 86 having a side edge 76 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 from the tip of the inclined portion 85 in the direction of the frame portion 47 toward the side edge and the frame portion 47 of the second side plate 4. Also, the tip of the parallel portion 86 located on the side edge side of the second side plate is connected to the frame portion 47.

[0063] As the first guide 81, the frame portion 47 exists on the extension line, outside the rotation orbit of the insertion protrusion 32, and at a position where the insertion hole 42 does not exist on the extension line. When the first side plate 3 rotates, it contacts the side edge portion 329 of the first side plate 3 while not contacting the insertion protrusion 32, and is provided with a first non-contact guide 812. Note that the installation on the orbit includes a state where the first guide 81 exists even on a part of the orbit.

[0064] By configuring it in this way, at the final stage of the rotation of the first side plate 3, in other words, when the upper end of the first side plate 3 approaches the extension portion 41 of the second side plate 4, the side edge portion 329 of the first side plate 3 contacts the first non-contact guide 812 which is the first guide 81, pushes the second side plate 4 outward, and the first side plate 3 is guided to the direction and position where it should rotate without contacting the second side plate 4 except for the first guide 81 and the second guide 82, smoothly guiding the rotation of the first side plate 3 and assisting the startup. Also, the insertion protrusion 32 can be smoothly guided into the insertion hole 42, assisting the assembly of the synthetic resin container 1. Further, when the synthetic resin container 1 is in the assembled state, the side edge portion 329 in the vicinity of the insertion protrusion 32 contacts the first non-contact guide 812 which is the first guide 81, presses against each other, can suppress the rattling of the side plates 3 and 4, and can prevent the deformation of the synthetic resin container 1.

[0065] Also, as the first guide 81, as shown in FIG. 8, a frame portion 47 exists on the extension line and is installed on the rotation path of the insertion protrusion 32. When the first side plate 3 rotates, it contacts the side edge portion 329 of the first side plate 3 and also includes a first contact guide 811 that contacts the insertion protrusion 32. The first contact guide 811 is connected to the peripheral edge of the insertion hole 42. With such a configuration, the first contact guide 811 also serves as a configuration for directly guiding the insertion protrusion 32 into the insertion hole 42.

[0066] In addition, the first guide 81 may be configured to install either the first contact guide 811 or the first non-contact guide 812. However, as shown in FIG. 9, it may also be configured to install both the first contact guide 811 and the first non-contact guide 812. Since the first contact guide 811 is also a configuration for directly guiding the insertion protrusion 32 into the insertion hole 42, it is preferably installed. The first guide 81 uses two horizontal ribs 407 to install one first contact guide 811 and one first non-contact guide 812 respectively, spaced vertically apart, parallel to each other, and parallel to the bottom surface 2, for a total of two. The first contact guide 811 and the first non-contact guide 812 extend from the horizontal rib 407 in the same shape and overlap exactly in plan view. The installation width of the two first guides 81 is not particularly limited.

[0067] In the case of a configuration where either the first contact guide 811 or the first non-contact guide 812 is installed, the number of installed first guides is not limited, and it may be configured to provide more than two instead of one. Also, in the case of a configuration where both the first contact guide 811 and the first non-contact guide 812 are installed, the number of installed first guides is not limited, and it may be configured to provide more than three instead of two. In addition, in the case of a configuration where two first contact guides 811 are installed, they are installed at an interval within the vertical width L of the insertion protrusion 32, and when the first side plate 3 rotates, the insertion protrusion 32 contacts the two first guides 81. Also, in the embodiment shown in FIG. 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 adopting such a configuration that both the first contact guide 811 and the first non-contact guide 812 are installed, when it comes to the final stage of the 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 insertion protrusion 32 and / or the side edge portion 329 of the first side plate 3 come into contact with the first guide 81. Specifically, the insertion protrusion 32 contacts the first contact guide 811, and subsequently, the side edge portion 329 contacts the first contact guide 811 and the first non-contact guide 812, pushing the second side plate 4 outward. The first side plate 3 is guided to the direction and position where it should rotate without contacting the second side plate 4 except for the first guide 81 and the second guide 82, smoothly guiding the rotation of the first side plate 3 and assisting in the startup. Also, the insertion protrusion 32 can be smoothly guided into the insertion hole 42, assisting in the assembly of the synthetic resin container 1. Further, when the synthetic resin container 1 is in the assembled state, the side edge portion 329 near the insertion protrusion 32 contacts the first guide 81 and presses against each other, suppressing the rattling of the side plates 3 and 4 and preventing the deformation of the synthetic resin container 1. Also, by adopting a configuration in which two first guides 81 are installed, when the synthetic resin container 1 is in the assembled state, the two first guides 81 contact the side edge portion 329 equally and support at two locations, further suppressing the rattling of the side plates 3 and 4.

[0069] Also, it is preferable that the tapered angle of the opposing surface 333 of the tip portion 328 of the insertion protrusion 32 facing the first contact guide 811 is different from the inclination angle of the side end edge 75 of the inclined portion 85 of the first contact guide 811. By configuring in this way, the friction between the insertion protrusion 32 and the first contact guide 811 can be reduced, and the rotation of the first side plate 3 and the outward expansion of the second side plate 4 can be made smoother.

[0070] Also, although not shown in the figure, the first guide may be composed of protrusions directly formed on the inner surface 40 of the second side plate 4 instead of being formed on the horizontal rib 407. The protrusions directly formed on the inner surface 40 can be configured in the same shape, at the same installation position, etc. as the protrusions formed on the horizontal rib 407 as described above. Incidentally, the first guide may be a mixture of the guide formed on the horizontal rib 407 and the guide directly formed on the inner surface 40.

[0071] Further, the first guide is not installed on the horizontal rib 407, nor is it formed in a flat plate shape. Instead, a plurality of protrusions are continuously installed at the same height position on the inner surface 40 of the second side plate 4, and protrusions having the same length are made continuous to form a parallel portion, and protrusions having different lengths may be made continuous to form an inclined portion. Alternatively, the first guide may be formed by continuously installing a plurality of protrusions on the horizontal rib 407 of the second side plate 4, making protrusions having the same length continuous to form a parallel portion, and making protrusions having different lengths continuous to form an inclined portion. The distance between these protrusions is at most the total length of at least the length of the insertion protrusion 32 and the thickness of the side edge portion 329, or, when the synthetic resin container 1 is in an assembled state, is set to a distance equal to or less than the thickness of the side edge portion 329 so that the side edge portion 329 contacts the first guide.

[0072] The side end edges 75, 76 of the inclined portion 85 and / or the parallel portion 86 of the first guide, that is, the sides that contact the insertion protrusion 32 and / or the side edge portion 329, may not be linear in plan view but may be concave and convex, such as wavy, sawtooth-shaped, etc. However, the pitch of the concavities and convexities is at most the total length of at least the length of the insertion protrusion 32 and the thickness of the side edge portion 329, or, when the synthetic resin container 1 is in an assembled state, is set to a distance equal to or less than the thickness of the side edge portion 329 so that the side edge portion 329 contacts the first guide. Alternatively, the first guide may have a mixture of a guide with linear side end edges 75, 56 facing the inner surface 40 in plan view and a guide with concave and convex shapes. Note that the side end edges 75, 76 of the first guide 81 may be planar or may be tapered linearly in the inner direction.

[0073] The first guide is not in a flat plate shape, and the side end edges of the inclined portion 85 and / or the parallel portion 86 that face the inner surface 40 are not linear in side view but have curved or refracted portions, and may include concave and convex portions such as wavy, sawtooth-shaped, curved, or refracted in side view. Alternatively, the first guide may have a mixture of a flat plate shape and a curved or refracted shape, and a guide with linear side end edges in side view and a guide with concave and convex shapes. Further, the first guide may have the above-described concave and convex shape in plan view and the above-described concave and convex shape in side view.

[0074] Incidentally, the first guide may be configured such that the tip of the inclined portion 85 is connected to the frame portion 47 without providing the parallel portion 86. However, when the first side plate 3 rotates, the parallel portion 86 is in line contact or surface contact with the side surface of the insertion protrusion 32 instead of point contact. Further, when the synthetic resin container 1 is in the assembled state, the parallel portion 86 is in surface contact with the side edge portion 329, and rattling of the side plates 3 and 4 can be more reliably suppressed. Therefore, it is preferable to provide the parallel portion 86. Also, although the inclined portion 85 is linearly configured in plan view, it may be a concave curve or a convex curve.

[0075] Incidentally, the vertical width of the first guide is not particularly limited and is set to be equal to or greater than the vertical width L of the insertion protrusion 32. When the first side plate 3 rotates and when the synthetic resin container 1 is in the assembled state, it is preferable to configure the guide to contact as large an area as possible of the side surfaces of the insertion protrusion 32 and the side edge portion 329. When three or more first guides are provided, the distance between the uppermost guide and the lowermost guide is set to be equal to or less than the vertical width L of the insertion protrusion 32, and when the first side plate 3 rotates, the insertion protrusion 32 may be configured to be installed so as to contact all the first guides.

[0076] Incidentally, the first guide does not have to be parallel to the bottom surface 2 when the synthetic resin container 1 is in the assembled state, and when a plurality of first guides are provided, they do not have to be parallel to each other. Incidentally, in these cases, the cases where the first guide is perpendicular to the second side plate 4 and the cases where it is not perpendicular are included, and when it is perpendicular, the cases where the first guide is horizontal and the cases where it is not horizontal are included. Also, guides parallel to the bottom surface 2 and guides not parallel to the bottom surface 2 may be mixed when the synthetic resin container 1 is in the assembled state.

[0077] Furthermore, the first guide does not necessarily have to be connected to the frame portion 47. When the first side plate 3 rotates, it only needs to be configured to contact the insertion protrusion 32 and / or the side edge portion 329 of the first side plate 3, and to contact the side edge portion 329 of the first side plate 3 when the synthetic resin container 1 is in an assembled state. In the case where 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, the distance of the gap should preferably be equal to or less than the total length of at least the length of the insertion protrusion 32 and the thickness of the side edge portion 329, so that the first guide and the insertion protrusion 32 or the side edge portion 329 are always in contact. Also, preferably, when the synthetic resin container 1 is in an assembled state, the distance is equal to or less than the thickness of the side edge portion 329 so that the side edge portion 329 contacts the first guide. Additionally, the first guide may be a mixture of a guide connected to the frame portion 47 and a guide not connected to the frame portion 47. Moreover, the first guide may be a mixture of those having the above-described shapes.

[0078] The second guide 82 is configured to guide the rotation of the first side plate 3 and to assist in guiding the insertion protrusion 32 into the insertion hole 42. The second guide 82 is located below the first guide and below the locking protrusion 401. When the first side plate 3 rotates, it is configured to contact the side edge portion 329 of the first side plate 3, and to contact the side edge portion 329 when the synthetic resin container 1 is in an assembled state. The second guide 82 is installed below the frame portion 47 and the insertion hole 42, not connected to the peripheral edges of the frame portion 47 and the insertion hole 42, and is installed outside the rotation trajectory of the insertion protrusion 32 and does not contact the insertion protrusion 32 when the first side plate 3 rotates. Other configurations can be the same as those of the above-described first guide 81.

[0079] That is, as shown well in FIG. 4, the second guide 82 is installed at both side ends of the inner surface 40 of the second side plate 4, at the corners of the second side plate 4 and the extension parts 41 extending from both its side ends. Also, the second guide 82 is composed of flat plate-like protrusions protruding from the inner surface 40 of the second side plate 4. Specifically, in the assembled state, flat plate-like protrusions are installed on the horizontal rib 407 provided on the inner surface 40 of the second side plate 4, which is parallel to the bottom surface 2, that is, the horizontal rib 407 is extended in the inner direction of the synthetic resin container 1 to form it. The second guide 82 protrudes horizontally in the assembled state of the synthetic resin container 1 and is linear in side view. And the second guide 82 is installed at a position where it does not contact the insertion protrusion 32 but contacts the side edge part 329 of the first side plate 3 when the first side plate 3 rotates.

[0080] Also, the second guide 82 gradually expands and protrudes in the inner direction of the synthetic resin container 1 from the center direction of the second side plate 4 toward the side end, that is, toward the extension part 41, to form an inclined part 850. Further, a parallel part 860 parallel to the inner surface 40 of the second side plate 4 is provided from the tip of the inclined part 850 in the direction of the extension part 41 toward the side end of the second side plate 4 and the frame part 47.

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

[0082] Also, the second guide 82 is flat plate-like and linear in side view. Also, the first guide 81 and the second guide 82 protrude in the same shape in the inner direction and exactly overlap in plan view. Incidentally, the second guide 82 may be configured such that the tip of the parallel part 860 is connected to a rib provided on the extension part 41.

[0083] By configuring in this way, at the final stage of the rotation of the first side plate 3, the side edge portion 329 of the first side plate 3 contacts the second guide 82, pushes the second side plate 4 outward, and the first side plate 3 can smoothly guide the rotation of the first side plate 3 without contacting the second side plate 4 except for the second guide 82 and the first guide 81. In addition, it can assist in smoothly guiding the insertion protrusion 32 into the insertion hole 42, and when the synthetic resin container 1 is in an assembled state, the side edge portion 329 presses against the second guide 82, and rattling of the side plates 3 and 4 can be suppressed.

[0084] In the illustrated embodiment, one horizontal rib 407 is used to install one second guide 82 at each one-side end of the second side plate 4. Further, the second guide 82 is installed at the middle position of the height of the second side plate 4. Note that the installation position and the number of installations of the second guide 82 are not particularly limited, and two or more may be provided at one-side end of the second side plate 4. When two or more second guides 82 are provided, they may be installed only in the upper part from the middle position of the height of the second side plate 4, only in the lower part from the middle position of the height of the second side plate 4, or in both the upper and lower parts from the middle position of the height of the second side plate 4.

[0085] Further, although not shown in the figure, the second guide may be constituted by a protrusion formed not on the horizontal rib 407 but on the inner surface 40 of the second side plate 4. The protrusion directly formed on the inner surface 40 can be configured in the same manner as the protrusion formed on the horizontal rib 407 as described above, having the same shape, the same installation position, etc. And the tip of the parallel portion of the protrusion is not in contact with the frame portion 47 and the insertion hole 42, but is connected to a rib connected to the extension portion 41. In this way, the protrusion as the second guide is installed at a position that does not contact the insertion protrusion 32 but contacts the side edge portion 329 of the first side plate 3 when the first side plate 3 rotates. Note that when receiving a plurality of second guides, the guides formed on the horizontal rib 407 and the guides directly formed on the inner surface 40 may be mixed.

[0086] Further, the second guide is not installed on the horizontal rib 407, nor is it formed in a flat plate shape. Instead, a plurality of protrusions are continuously installed at the same height position on the inner surface 40 of the second side plate 4. Protrusions having the same length may be continuous to form a parallel portion, and protrusions having different lengths may be continuous to form an inclined portion. Alternatively, the second guide may have a plurality of protrusions continuously installed on the horizontal rib 407 of the second side plate 4. Protrusions having the same length may be continuous to form a parallel portion, and protrusions having different lengths may be continuous to form an inclined portion. The distance between these protrusions is set to be at least less than or equal to the thickness of the side edge portion 329 so that the side edge portion 329 contacts the second guide.

[0087] The side end edges 77, 78 of the inclined portion 850 and / or the parallel portion 860 of the second guide, that is, the sides that contact the side edge portion 329, may not be linear in plan view but may be uneven, such as wavy, sawtooth-shaped, etc. However, the pitch of the unevenness is set to be at least less than or equal to the length of the side edge portion 329 so that the side edge portion 329 contacts the second guide. Further, the second guide may have a mixture of a guide with a linear side end edge in plan view and a guide with an uneven shape.

[0088] The second guide is not in a flat plate shape, and the side end edges 77, 78 of the inclined portion 850 and / or the parallel portion 860 that face the inner surface 40 are not linear in side view but have curved or refracted portions and may include uneven portions such as wavy, sawtooth-shaped, curved, refracted, etc. in side view. Further, the second guide may have a mixture of a flat plate shape and a curved or refracted shape, a guide with a linear side end edge in side view and a guide with an uneven shape. Further, the second guide may have the above-described uneven shape in plan view and the above-described uneven shape in side view.

[0089] Further, 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 providing the parallel portion 860. However, 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 instead of point contact. Further, when the synthetic resin container 1 is in an assembled state, the parallel portion 860 makes surface contact with the side edge portion 329, and rattling of the side plates 3 and 4 can be more reliably suppressed. Therefore, it is preferable to provide the parallel portion 860. Further, although the inclined portion 850 is linearly configured in a plan view, it may be a concave curve or a convex curve.

[0090] Further, the second guide does not have to be parallel to the bottom surface 2 when the synthetic resin container 1 is in an assembled state. Also, when a plurality of second guides are provided, they may be parallel to each other or may not be parallel to each other. In these cases, it includes the case where the first guide is perpendicular to the second side plate 4 and the case where it is not perpendicular. When it is perpendicular, it includes the case where the first guide is horizontal and the case where it is not horizontal. Also, a guide parallel to the bottom surface 2 and a guide not parallel to the bottom surface 2 may be mixed when the synthetic resin container 1 is in an assembled state.

[0091] Further, the second guide does not necessarily have to be connected to the extension portion 41 or a rib connected to the extension portion 41. When the first side plate 3 rotates, it is installed on the rotation orbit of the side edge portion 329 and contacts the side edge portion 329 of the first side plate 3. When the synthetic resin container 1 is in an assembled state, it is only necessary to be configured to contact the side edge portion 329 of the first side plate 3. Also, when the second guide is not connected to the extension portion 41 or a rib connected to the extension portion 41 and there is a gap between the second guide and the rib connected to the extension portion 41 or the extension portion 41, the distance of the gap is preferably at most the length of the thickness of at least the side edge portion 329 so that the second guide and the side edge portion 329 are always in contact from the start of contact until the synthetic resin container 1 is in an assembled state. Also, when the synthetic resin container 1 is in an assembled state, it is preferably a distance not exceeding the thickness of the side edge portion 329 so that the side edge portion 329 contacts the first guide. Also, the second guide may be a mixture of a guide connected to the extension portion 41 or a rib connected to the extension portion 41 and a guide not connected thereto. Further, the second guide may be a mixture of those having the above shapes.

[0092] Further, as the guide 8, a first guide 81 and a second guide 82 are provided, but it may be configured to provide only one of them. Also, the guide may be installed on the orbit of the side edge portion 329 of the first side plate 3 when the first side plate 3 is rotated upward, at both side ends of the inner surface 40 of the second side plate 4, which are not the corner portions of the second side plate 4 and the extension portions 41 extending from both its side ends. And, the guide provided at the corner portion of the extension portion 41 and the guide provided at a position other than the corner portion of the extension portion 41 may be configured to provide both, or may be configured to provide only one of them. Also, a guide may be provided at the upper end portion of the second side plate 4, above the lock projection 401, on an extension line where the frame portion 47 does not exist.

[0093] Also, in addition to the guide 8, as shown in FIG. 4, an auxiliary guide 9 for assisting the function of the guide 8 and guiding the rotation of the first side plate may be installed. The auxiliary guide 9 is composed of a vertical rib 409 extending in a direction intersecting the first guide 81, such as the side end side of the second side plate 4 of the first guide 81. Specifically, the auxiliary guide 9 is composed of a vertical rib 409 connecting the first guide 81 and a horizontal rib 407 above the first guide 81 with the insertion hole 42 interposed therebetween. This vertical rib 409 is in contact with the insertion hole 42 and is also a rib constituting the frame body 47.

[0094] Thus, the auxiliary guide 9 is configured to contact the insertion projection 32 and the side edge portion 329 of the first side plate 3 when the first side plate 3 is rotated, and to contact the side edge portion 329 when the synthetic resin container 1 is in an assembled state. And, the auxiliary guide 9 is also configured to guide the insertion projection 32 into the insertion hole 42. Further, in order not to form unnecessary corners at the upper end or the lower end of the auxiliary guide 9, it is preferable that the first guide 81 and the horizontal rib 407 above the first guide 81 extend inward of the synthetic resin container 1 in the same shape and overlap exactly in plan view.

[0095] By adopting the configuration of installing the auxiliary guide 9 in this way, at the final stage of the rotation of the first side plate 3, the insertion protrusion 32 and the side edge portion 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 where it should rotate, smoothly guiding the rotation of the first side plate 3, assisting in the startup, and also being able to smoothly guide the insertion protrusion 32 into the insertion hole 42, assisting in the assembly of the synthetic resin container 1. Further, when the synthetic resin container 1 is in the assembled state, the side edge portion 329 near the insertion protrusion 32 comes into contact with the auxiliary guide 9 and presses against each other, suppressing the rattling of the side plates 3 and 4, and preventing the deformation of the synthetic resin container 1.

[0096] Next, the assembly method of the synthetic resin container 1 and the functions of the first engaging portion 5, the second engaging portion 6, the locking mechanism 7, and the guide 8 will be described. Here, as an example, a configuration in which the first contact guide 811 and the first non-contact guide 812 are installed as the first guide 81 will be described. When assembling the synthetic resin container 1, first, starting from the state where the four side plates are folded on the bottom plate 2, lift the upper ends of the opposing long-side second side plates 4, 4 that are to be raised first, rotate them around the shaft 21, and raise them while drawing an arc at the upper end to make them stand up. Then, lift the upper ends of the opposing short-side first side plates 3, 3 that are to be raised later, rotate them around the shaft 21, and raise them while drawing an arc at the upper end to make them stand up.

[0097] When the upper ends of the first side plates 3, 3 approach the extension 41 of the second side plates 4, 4, it reaches the final stage of the rotation of the first side plates 3. The side edge 329 of the first side plate 3 contacts the side end edge 77 of the inclined portion 850 of the second guide 82, and gradually pushes and expands the periphery of the second guide 82 of the second side plate 4 outward. Further, when the first side plate 3 is rotated and raised, the insertion protrusion 32 and / or the side edge 329 of the first side plate 3 contact the side end edge 75 of the inclined portion 85 of the first guide 81. Specifically, the opposing surface 333 of the tip 328 of the insertion protrusion 32 contacts the side end edge 75 of the inclined portion 85 of the first contact guide 811, the insertion protrusion 32 contacts the first contact guide 811. Subsequently, the side edge 329 contacts the first contact guide 811 and the first non-contact guide 812, and gradually pushes and expands the periphery of the first guide 81 of the second side plate 4 outward. At this time, except for the second guide 82 and the first guide 81, the first side plate 3 does not contact the second side plate 4, and the rotation of the first side plate 3 becomes smooth. Then, the insertion protrusion 32 is guided by the first contact guide 811 and inserted into the insertion hole 42.

[0098] At the same time, when the upper ends of the first side plates 3, 3 approach the extension 41 of the second side plates 4, 4, the engaging projection 362 protruding from the tip of the operation portion 361 abuts against the rear surface 418 of the locking projection 401. Further, when the first side plates 3, 3 are rotated, due to the spring action between the engaging projection 362 and the locking projection 401, the engaging projection 362 pushes up the locking projection 401, and the locking projection 401 pushes down the engaging projection 362. At this time, since the rear surface 418 of the locking projection 401 is inclined downward toward the front surface 419, and further, the front surface 366 of the engaging projection 362 is inclined rearward upward, even with a weak force due to the spring action between them, the locking projection 401 can be pushed up and the engaging projection 362 can be pushed down.

[0099] Then, when the engaging projection piece 362 contacts and slides along the rear surface 418 of the locking projection 401 and exceeds the tip surface 419, the locking projection 401 is lowered by the spring action of the locking projection 401, and conversely, the engaging projection piece 362 is raised, and the engaging projection piece 362 turns into the side of the tip surface 419 of the locking projection 401. In this way, the engaging projection piece 362 is positioned between the tip surface 419 of the locking projection 401 and the inner surface 49 of the extension portion 41 and engages with the locking projection 401.

[0100] Also, 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 stand up while rotating, the engaging projections 33 constituting the second engaging portion 6 are inserted into the engaging recesses 44 provided in 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 end portions of the first side plates 3, 3 are inserted into the insertion holes 42 provided in the second side plates 4, 4 and are fitted and engaged.

[0101] Then, when the engaging projection piece 362 and the locking projection 401 are engaged, and at the same time as the engaging projection 33 is inserted into and engaged with the engaging recess 44, the insertion projection 32 is completely inserted into the insertion hole 42, and the synthetic resin container 1 is in an assembled state. At this time, the side edge portion 329 of the first side plate 3 maintains contact with and presses against the first guide 81 of the second side plate 4, and the side edge portion 329 of the first side plate 3 maintains contact with and presses against the second guide 82 of the second side plate 4, so that rattling of the side plates 3, 4 can be suppressed, and deformation of the synthetic resin container 1 can also be prevented.

[0102] In this way, by simply standing up the second side plates 4, 4 on the long side and then standing up the first side plates 3, 3 on the short side, the synthetic resin container 1 can be assembled extremely easily. 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 also be prevented.

[0103] Next, when unlocking and folding the synthetic resin container 1, the operation portion 361 of the locking member 36 is pushed down (in the direction of arrow B) to release the engaged state between the engaging projection piece 362 and the locking projection 401. To release the engaged state between the engaging projection piece 362 and the locking projection 401, insert a finger into the recess 364 for hanging the finger of the locking member 36 and push it down against the upward biasing force of the spring 37. At the same time, the engaging projection piece 362 protruding from the tip is also pushed down. Thus, the upper surface of the engaging projection piece 362 is pushed down below the lower surface of the locking projection 401, and the engagement between the engaging projection piece 362 and the locking projection 401 is released.

[0104] When the engaged state between the engaging projection piece 362 and the locking projection 401 is released, it becomes possible to rotate the first side plates 3, 3 inward while rotating them in the opposite direction to when assembling. Therefore, while pushing down the locking member 36, the first side plates 3, 3 are rotated inward and pulled down, rotated about the shaft 21, rotated inward while drawing an arc at the upper end, and stacked on the bottom plate 2. Incidentally, if the finger is released from the recess 364 for hanging the finger of the locking member 36 and the pushing down is stopped while the first side plates 3, 3 are being rotated inward, the locking member 36 returns to its original position by the biasing force of the spring 37. Thereafter, the upper end portions of the second side plates 4, 4 are held and pulled inward, rotated about the shaft 21, rotated inward while drawing an arc at the upper end, and stacked on the side plates 3 to be in a folded state. In this way, the synthetic resin container 1 can be easily folded.

[0105] In the above-described embodiment, the synthetic resin container 1 is configured to include the first engaging portion 5, the second engaging portion 6, and the locking mechanism 7. However, the synthetic resin container may be configured to include only the first engaging portion and the locking mechanism without the second engaging portion 6.

[0106] Also, in the above-described embodiment, when folding, the first side plate to be folded first is the side plate on the short side, and the second side plate to be folded later is the side plate on the long side. However, the first side plate to be folded first may be the side plate on the long side, and the second side plate to be folded later may be the side plate on the short side. Further, the bottom plate may be square, and the first side plate to be folded first and the second side plate to be folded later, that is, the horizontal lengths of the four side plates may be the same length.

Industrial Applicability

[0107] The synthetic resin container of the present invention as described above is an assembled type, and the rising of the side plates can be easily and smoothly performed, and it can be easily assembled. Moreover, in the assembled state, rattling between the container itself and the side plates and deformation of the container can be reduced. Therefore, it can be used in many industries that need to transport goods such as the logistics industry.

Explanation of Reference Numerals

[0108] 1 Synthetic resin container 2 Bottom plate 3 First side plate 32 Insertion protrusion 329 Side edge portion 33 Engagement protrusion 36 Lock member 362 Engagement tab 37 Spring 4 Second side plate 41 Extension 42 Insertion hole 43 Engagement plate 44 Engagement recess 45 Plate 47 Frame portion 401 Lock protrusion 407 Horizontal rib 5 First engagement portion 6 Second engagement portion 7 Lock mechanism 8 Guide 81 First guide 811 First contact guide 812 First non-contact guide 82 Second guide 85 Inclined portion 850 Inclined portion 86 Parallel portion 860 Parallel portion 9 Auxiliary guide

Claims

1. The container comprises a bottom plate having a rectangular shape in a plan view, and four side plates rotatably installed on the side ends of four sides of the bottom plate, the pair of opposing first side plates being raised later during assembly, and another pair of opposing second side plates being raised first; a first engagement portion and locking mechanism for stopping the rotation of the side plates when the synthetic resin container is in an assembled state, and a guide for guiding the rotation of the first side plate, which is installed on the inner surface of the second side plate, the first engagement portion being configured with an insertion protrusion provided on the first side plate and an insertion hole provided on the second side plate, the insertion protrusion being provided on an upper portion of an outer surface of a side edge portion of the first side plate, the insertion hole being an upper portion of an extension portion extending inwardly from both side ends of the second side plate, and being installed at a position where the insertion protrusion can be inserted when the synthetic resin container is in an assembled state, and the locking mechanism being configured with locking protrusions provided on both side ends of the second side plate and a locking member installed on the first side plate. a locking projection formed on each side end of the second side plate and projecting inwardly from the synthetic resin container from a plate having a spring action formed on each side end of the second side plate; the locking member is installed on the upper outer part of the first side plate and comprises an operating portion, an engaging piece projecting from the tip of the operating portion and engaging with the locking projection, and a spring provided on the underside of the operating portion and having the effect of urging the locking member upward; the guide is configured as a protrusion projecting 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 direction toward the side end of the second side plate, and is installed in a position where it comes into contact with and presses against the side edge of the first side plate when the first side plate is rotated and when the synthetic resin container is in an assembled state, and the guide comprises a first guide which is installed at the upper end of the second side plate and has an extension line of a frame portion that defines the insertion hole.

2. The container has a bottom plate having a rectangular shape in a plan view, and four side plates rotatably installed on side ends of four sides of the bottom plate, the first pair of opposing side plates being raised later during assembly, and another pair of opposing second side plates being raised first, a first engagement portion and locking mechanism for stopping the rotation of the side plates when the synthetic resin container is in an assembled state, and guides for guiding the rotation of the first side plate, which are installed on both side ends of the inner surface of the second side plate, the first engagement portion being configured with an insertion protrusion provided on the first side plate and an insertion hole provided on the second side plate, the insertion protrusion being provided on an upper portion of an outer surface of a side edge portion of the first side plate, the insertion hole being an upper portion of an extension portion extending inwardly from both side ends of the second side plate, and being installed at a position where the insertion protrusion can be inserted when the synthetic resin container is in an assembled state, and the locking mechanism is configured with locking protrusions provided on both side ends of the second side plate and locking portions installed on the first side plate. the locking protrusions are formed on both side ends of the second side plate and protrude inwardly of the synthetic resin container from plates having a spring action formed on the opposite side ends of the second side plate, the locking member is installed on the upper outer side of the first side plate and comprises an operating portion, an engaging piece protruding from the tip of the operating portion and engaging with the locking protrusions, and a spring provided on the underside of the operating portion and having the effect of urging the locking member upward, the guide is formed of a protrusion 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 direction toward the side end of the second side plate, and is installed in a position where it comes into contact with and presses against the side edge of the first side plate when the first side plate is rotated and when the synthetic resin container is in an assembled state, and the guide is a first guide provided at the upper end of the second side plate and has an extension line of a frame portion that defines the insertion hole.

3. An assembled synthetic resin container as described in claim 1, characterized in that the guide has a parallel portion parallel to the inner surface of the second side panel from the tip of the inclined portion toward the side end of the second side panel.

4. An assembly-type synthetic resin container as described in Claim 2, characterized in that the guide has a parallel portion parallel to the inner surface of the second side panel from the tip of the inclined portion toward the side end of the second side panel.

5. The assembly-type synthetic resin container according to any one of claims 1 to 4, characterized in that the guide is configured by installing the protrusion on a horizontal rib provided on the inner surface of the second side plate.

6. An assembly-type synthetic resin container as described in any one of claims 1 to 4, characterized in that the guide is provided with a second guide installed below the first guide.

7. An auxiliary guide for guiding the rotation of the first side plate is provided on the side end side of the second side plate of the first guide, extending in a direction intersecting with the first guide, and the auxiliary guide is composed of a vertical rib that forms a frame portion that defines the insertion hole on the inner surface of the second side plate, and is installed in a position where it contacts the insertion protrusion and the side edge portion of the first side plate when the first side plate rotates, and contacts and presses against the side edge portion of the first side plate when the synthetic resin container is in an assembled state.

8. The synthetic resin container according to any one of claims 1 to 4, characterized in that the synthetic resin container has a second engagement portion, which is configured with engagement protrusions formed on both side ends of the first side plate and protruding outward, and an engagement recess opening inward into the extension portion of the second side plate, and is positioned so that the engagement protrusions are inserted into the engagement recesses when the container is assembled.

9. An assembly-type synthetic resin container as described in any one of claims 1 to 4, characterized in that the first guide is one or more guides selected from a first contact guide that contacts the insertion protrusion when the first side plate rotates and a first non-contact guide that does not contact the insertion protrusion when the first side plate rotates.

10. The assembly-type synthetic resin container according to claim 6, characterized in that the first guide is one or more guides selected from a first contact guide that contacts the insertion protrusion when the first side plate rotates and a first non-contact guide that does not contact the insertion protrusion when the first side plate rotates.

11. The assembly-type synthetic resin container described in claim 9, characterized in that an auxiliary guide for guiding the rotation of the first side plate is provided on the side end side of the second side plate of the first contact guide and / or the first non-contact guide, extending in a direction intersecting with the first guide, and the auxiliary guide is composed of a vertical rib that forms a frame portion that defines the insertion hole on the inner side of the second side plate, and is installed in a position where it contacts the insertion protrusion and the side edge portion of the first side plate when the first side plate rotates, and contacts and presses against the side edge portion of the first side plate when the synthetic resin container is in an assembled state.

12. An assemblyable synthetic resin container as described in Claim 9, characterized in that it is provided with the first contact guide, and the tapered angle of the opposing surface of the tip of the insertion protrusion that faces the first contact guide is different from the inclination angle of the side end edge of the inclined portion of the first contact guide.

13. The synthetic resin container has a bottom plate having a rectangular shape in a plan view, and four side plates rotatably installed on the side ends of four sides of the bottom plate, the first pair of opposing side plates being raised later during assembly, and another pair of opposing second side plates being raised first, a first engagement portion and locking mechanism for stopping the rotation of the side plates in the assembled state of the synthetic resin container, and a guide for guiding the rotation of the first side plate, the first engagement portion being configured with an insertion protrusion provided on the first side plate and an insertion hole provided on the second side plate, is provided on an upper portion of an outer surface of a side edge portion of the first side plate, the insertion hole is an upper portion of an extension portion extending inward from both side ends of the second side plate, and is provided at a position where the insertion protrusion can be inserted when the synthetic resin container is in an assembled state, the locking mechanism is configured with locking protrusions provided on both side ends of the second side plate and a locking member installed on the first side plate, the locking protrusions are configured to protrude inward of the synthetic resin container from plates having a spring action formed on both side ends of the second side plate, and the locking members are configured to protrude inward of the synthetic resin container from the outer side of the first side plate. the locking member is disposed at an upper portion of the first side plate and is provided with an operating portion, an engaging protrusion protruding from a tip of the operating portion for engaging with the locking protrusion, and a spring provided on the underside of the operating portion for urging the locking member upward; the guide is formed of a protrusion protruding from the inner surface of the second side plate and has an inclined portion which gradually expands from the center direction of the second side plate toward the side end toward the inside of the synthetic resin container, and is disposed at a position where it comes into contact with and presses against the side edge portion of the first side plate when the first side plate is rotated and when the synthetic resin container is in an assembled state; A method for assembling a prefabricated synthetic resin container in which a first guide is installed at the upper end of the second side panel, and a frame portion that defines the insertion hole is on its extension line, characterized in that when the first side panel is raised, the first side panel is brought into contact with the first guide, and the second side panel is pushed outward to be assembled, and in the assembled state, contact between the side edge of the first side panel and the first guide of the second side panel is maintained, and the side edge of the first side panel and the first guide of the second side panel are pressed against each other.

14. A method for assembling a prefabricated synthetic resin container as described in Claim 13, characterized in that, on the side end side of the second side plate of the first guide, an auxiliary guide for guiding the rotation of the first side plate is provided, extending in a direction intersecting with the first guide, and the auxiliary guide is composed of vertical ribs that form a frame portion that defines the insertion hole on the inner surface of the second side plate, and is arranged in a position where it comes into contact with the insertion protrusion and the side edge portion of the first side plate when the first side plate rotates, and comes into contact with the side edge portion of the first side plate and presses against each other when the synthetic resin container is in an assembled state, wherein, in the assembled state, contact between the side edge portion of the first side plate and the auxiliary guide of the second side plate is maintained, and the side edge portion of the first side plate and the auxiliary guide of the second side plate are pressed against each other.

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