JP7378784B2 - folding container - Google Patents

Description

The present invention relates to a folding container that can be folded inward.

Conventionally, various techniques have been proposed regarding the above-mentioned folding container.

For example, the folding container described in Patent Document 1 below has a rectangular bottom plate and a pair of side plates that are pivoted to side plate pivoting protrusions that are respectively provided upright on a pair of opposing side edges of the bottom plate. and an assembled position in which the side plates are upright with respect to the bottom plate at the upper part of the side plate shaft attachment protrusion, and a folded position in which the side plates are along the top surface of the bottom plate inside the container of the side plate shaft attachment protrusion. In a folding container that is configured to be rotatable and folded with the other side plate superimposed on one side plate that has first been rotated to the folded position, the side plate includes a side plate that protrudes from the inner side of the container at the lower end of the side plate. , a hinge part having a pair of hinge pins protruding from each projecting end, and a slide protrusion protruding from the outer side of the container at the lower end of the side plate with a dimension shorter than the protruding dimension of the hinge part; , a hinge part insertion groove through which the hinge part is inserted is provided at a position corresponding to the hinge part, extending from the container inner part of the side plate shaft mounting projection piece to the top plate part of the side plate shaft mounting projection piece; A hinge pin engagement groove in which the hinge pin rotatably and movably engages is provided in the inner side wall portion in a container height direction with a lower portion of the hinge pin engagement groove inclined toward the outside of the container; At a position corresponding to the slide protrusion, a slide surface is provided on which the protruding end of the slide protrusion comes into sliding contact from the inner part of the container of the side plate shaft attachment protrusion to the top plate part of the side plate axle attachment protrusion, and the slide surface of the side plate shaft attachment protrusion slides on the inner side of the container. The surface is an inclined surface whose upper part is inclined toward the outside of the container, and the sliding surface of the top plate is provided with a recess on the outside of the container to accommodate the sliding protrusion at the assembly position of the side plate.

According to Patent Document 1 listed below, the above-mentioned folding container can stand upright by smoothly rotating the side plates overlapping the bottom plate due to such characteristics.

Japanese Patent Application Publication No. 2006-89067

However, in the folding container described above, when the side plates rotate from the folded position to the assembled position, the hinge pin moves while engaging with the inner side wall of the hinge insertion groove. Therefore, the hinge pin is subjected to a load due to engagement with the inner side wall portion of the hinge portion insertion groove, and there is a risk that the hinge pin may break.

Therefore, the present invention has been made in view of the above-mentioned points, and is designed to prevent the retaining shaft of the folding side wall from breaking when the folding side wall rotates from the horizontal position to the upright position. An object of the present invention is to provide a collapsible container that prevents the above.

The invention according to claim 1, which has been made to solve this problem, is a folding container that includes a bottom wall, a bank-side side wall extending upward from the edge of the bottom wall, and a bank-side side wall extending upward from the edge of the bottom wall. a folding-side side wall portion that rotates between an upright position extending upward from the upper end surface and a sideways position lying inward with respect to the bank-side side wall portion; The folding side wall includes a connecting arm that projects outward from one end of the folding side wall, and the connecting arm has a protrusion provided at the tip of the folding side wall on the inner wall side of the folding side wall. and a retaining shaft that protrudes in the extending direction of the one end side in at least one direction along the one end side of the at least one connecting arm provided in the extending direction of the one end side, and the bank side side wall part is provided with: A vertical hole portion is provided in which the connecting arm is stored in an upright position, and the vertical hole portion is open on the inner wall side surface of the bank side wall portion, and the connecting arm is inserted when the folding side wall portion is in a horizontal position. an opening, and a recess provided on the opposite side of the bottom wall surface forming the bottom surface of the vertical hole part from the opening, into which the protrusion of the connecting arm enters when the folding side wall part is in the horizontal position, When the folding side wall portion rotates from the horizontal position to the upright position, the protrusion of the connecting arm slides on the side wall surface forming the side surface of the recess on the side of the opening of the recess , and the retaining shaft is inserted into the vertical hole. It is characterized by being spaced apart from the bottom wall of the section and moving within the vertical hole without contacting the entire wall surface forming the vertical hole .

The invention according to claim 2 is the folding container according to claim 1, wherein the upper part of the side wall surface of the recess is formed in a planar shape extending from the recess toward the opening or in an outwardly convex curved shape, and the protrusion is , a base formed in a planar shape in which the proximal end side of the connecting arm of the protrusion portion is formed in a planar shape in which the height from the inner wall side surface of the folding side side wall portion decreases continuously as the protruding portion moves toward the proximal end side of the connecting arm; The end inclined surface and the distal end of the connecting arm of the protrusion are formed in a plane shape in which the height from the inner wall side of the folding side wall portion decreases continuously toward the distal end of the connecting arm. and a distal end side inclined surface.

The invention according to claim 3 is the folding container according to claim 2, wherein the protrusion is a surface provided between the proximal side inclined surface and the distal side inclined surface, and is flat or external. 3. The foldable container according to claim 2, further comprising an intermediate surface formed in a convex curved shape.

In the folding container of the invention according to claim 1, when the folding side wall section is in the horizontal position, the protrusion of the connecting arm of the folding side wall section enters into the recess of the vertical hole section of the bank side wall section. . As a result, the retaining shaft of the connecting arm of the folding side wall is placed on the bottom wall surface of the vertical hole of the bank side wall. When the folding side wall portion rotates from the horizontal position to the upright position, the protrusion of the connecting arm slides on the side wall surface forming the side surface of the recess on the side of the opening of the recess of the vertical hole. Therefore, when the retaining shaft of the connecting arm is separated from the bottom wall surface of the vertical hole, it moves within the vertical hole without contacting the entire wall surface forming the vertical hole, so that the retaining shaft is prevented from breaking.

In the folding container of the invention according to claim 1, the connecting arm in the upright position is housed in the vertical hole, and the connecting arm in the horizontal position is inserted into the opening of the vertical hole, so that the above-mentioned recesses, protrusions, and the retaining shaft are gathered in the vertical hole. Therefore, in the folding container of the invention according to claim 1, a bending moment or the like is unlikely to occur when the folding side wall portion rotates, so a decrease in strength of the bank side side wall portion and the folding side side wall portion is prevented. Furthermore, since the folding container of the invention according to claim 1 can be packed into a small size, it is suitable for downsizing and thinning.

In the foldable container of the invention according to claim 2, the upper part of the side wall surface of the recess on which the protrusion slides is formed in a planar shape extending from the recess toward the opening or in a curved shape convex outward. In addition, the proximal inclined surface of the protrusion that slides on the side wall surface of the recess has a height that is continuous from the inner wall surface of the folding side wall toward the proximal end of the connecting arm. It is formed into a planar shape that decreases to . Furthermore, the height of the distal inclined surface of the protrusion that slides on the side wall surface of the concave portion from the inner wall surface of the folding side wall portion decreases continuously toward the distal end side of the connecting arm. It is formed into a planar shape. Therefore, since the protrusion smoothly slides on the side wall surface of the recess, the folding side wall smoothly rotates between the horizontal position and the upright position.

In the foldable container of the invention according to claim 3, the intermediate surface of the protrusion that slides on the side wall surface of the recess is a surface provided between the proximal side inclined surface and the distal side inclined surface, and is a flat surface. Alternatively, it is formed into an outwardly convex curved surface. Therefore, the folding side wall portion smoothly rotates between the horizontal position and the upright position.

FIG. 2 is a perspective view showing the folding container of the present embodiment, in which the folding side wall portion is in an upright state (hereinafter, may be abbreviated as "the same folding container in an upright state"). This is a diagram. FIG. 2 is a perspective view showing the folding container in which the folding side wall portion is in a sideways state (hereinafter, may be abbreviated as "the same folding container in a sideways state"). FIG. 2 is a perspective view showing the bank-side side wall portion, etc. of the folding container. FIG. 4 is an enlarged perspective view of the vertical hole and the like of the bank-side side wall of FIG. 3; FIG. 3 is a perspective view showing the folding side wall of the folding container in an upright state. FIG. 6 is an enlarged perspective view of the connecting arm and the like of the folding side wall portion of FIG. 5; It is a sectional view showing the same folding container in a sideways state. FIG. 2 is a cross-sectional view of the folding container in which the folding side wall portion is in an intermediate state between a sideways state and an upright state (hereinafter may be abbreviated as "the folding container in an intermediate state"). FIG. 3 is a sectional view showing the folding container in an upright state. FIG. 2 is a perspective cross-sectional view showing a regulating protrusion, a regulating rib, etc. (hereinafter referred to as a "regulating section, etc.") of the folding container in a sideways state. FIG. 3 is a cross-sectional view showing the regulating portion and the like of the folding container in a sideways state. FIG. 3 is a cross-sectional view showing a regulating portion and the like of the folding container in an intermediate state. FIG. 3 is a cross-sectional view showing the regulating portion and the like of the folding container in an upright state. FIG. 2 is a perspective cross-sectional view showing a retaining shaft, a retaining rib, etc. (hereinafter referred to as a "retaining part, etc.") of the folding container in a sideways state. FIG. 2 is a cross-sectional view showing a retaining portion of the folding container in a sideways state. FIG. 3 is a sectional view showing a retaining portion and the like of the folding container in an intermediate state. FIG. 3 is a cross-sectional view showing a retaining portion and the like of the folding container in an upright state. FIG. 7 is a perspective view of a modified example of the folding side wall portion of the folding container in an upright state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A foldable container according to the present invention will be described below based on the present embodiment with reference to the drawings.

As shown in FIGS. 1 and 2, the foldable container 1 of this embodiment is molded using a resin such as polypropylene, and includes a bottom wall 3, a bank side wall 5, It is provided with a tatami-side side wall portion 7 and the like. The bottom wall portion 3 has a substantially rectangular shape with four edges 4. Each edge 4 of the bottom wall portion 3 is composed of a pair of opposing long side edges 4A and a pair of opposing short side edges 4B.

In FIGS. 1 and 2, the direction of symbol D1 indicates the up-down direction. The direction of symbol D2 indicates the width direction of the bottom wall portion 3 along the long side edge 4A. The direction of symbol D3 indicates the width direction of the bottom wall portion 3 along the short side edge 4B. The directions D1, D2, and D3 are orthogonal to each other. These points also apply to each perspective view described later.

Hereinafter, the direction D1 will be referred to as the vertical direction D1. The direction D2 is expressed as a long side direction D2. The direction D3 is expressed as a short side direction D3. In addition, in FIGS. 7 to 9, FIGS. 11 to 13, and FIGS. 15 to 17, the direction perpendicular to the paper surface is the long side direction D2.

At each edge 4 of the bottom wall 3, a bank side wall 5 extends upward. Each of the bank-side side wall portions 5 is connected to each other at a pair of opposite sides in the long side direction D2 or the short side direction D3. A folding side wall portion 7 is attached to each bank side wall portion 5.

Each folding side wall portion 7 can be rotated between an upright position shown in FIG. 1 and a sideways position shown in FIG. 2 by a configuration described later. In the upright position shown in FIG. 1, each folding side wall 7 stands upright from the upper end of each bank side wall 5 (hereinafter abbreviated as "upright state"). On the other hand, in the sideways position shown in FIG. 2, it is in a state where it lies sideways inward with respect to each bank-side side wall portion 5 (hereinafter abbreviated as "sideways state"). In this way, each folding side wall section 7 is stacked on the upper side of the bottom wall section 3 by so-called inward tilting. In order to secure the stacking space, in the folding container 1, the height of each bank side wall portion 5 extending along the short side direction D3 is the same as the height of each bank side side wall portion 5 extending along the long side direction D2. It is formed lower than the Note that the configuration of the folding container 1 is well known, except for the configuration described later, and therefore the description thereof will be omitted.

As shown in FIG. 3, three vertical holes 9A, 9B, and 9C are provided at equal pitches in each bank side wall 5 extending along the long side direction D2. Furthermore, three vertical holes 9E, 9F, and 9G are provided at equal pitches in each bank side wall portion 5 extending along the short side direction D3. Hereinafter, when the vertical hole portions 9A, 9B, 9C, 9E, 9F, and 9G are collectively referred to without distinction, they will be referred to as "each vertical hole portion 9" or "vertical hole portion 9." Each vertical hole part 9 is formed along the downward direction from the upper end side of each bank side wall part 5. Below, among the vertical hole parts 9, the vertical hole part 9C of the bank side side wall part 5 extending along the long side direction D2 will be explained as an example. Incidentally, a strut 10 is formed along the vertical direction D1 on the inner wall surface of the bank side wall portion 5 extending along the short side direction D3. The column 10 supports the folding side wall 7 in the sideways state by placing the folding side wall 7 in the sideways state at its tip.

As shown in FIG. 4, an opening 11 is formed in the vertical hole 9C. The opening 11 opens at a surface 5A on the inner wall side of the bank side wall 5 (hereinafter abbreviated as "inner wall surface 5A of the bank side wall 5"). In the long side direction D2, the width of the opening 11 is shorter than the width of the vertical hole 9C. Further, a pair of protruding walls 13A and 13B forming both sides of the opening 11 are provided with retaining ribs 15. Although FIG. 4 shows the retaining rib 15 provided on the protruding wall 13B of the pair of protruding walls 13A and 13B, the retaining rib 15 is similarly provided on the protruding wall 13A.

The retaining rib 15 moves downward toward the inner surface 5B of the outer wall of the bank side wall 5 (hereinafter abbreviated as "outer wall inner surface 5B of the bank side wall 5"). The lower end of the retaining rib 15 faces the outer wall side inner surface 5B of the bank side wall portion 5 with an interval that allows passage of at least a retaining shaft 31B (see FIG. 5), which will be described later. A notch 17 is provided on the lower side of the retaining rib 15. In the cutout portion 17, the projecting wall 13B is recessed toward the inner wall surface 5A of the bank side wall portion 5. An escape opening 19 is provided on the outer wall side inner surface 5B of the bank side wall portion 5 at a position facing the notch portion 17 in the short side direction D3. The relief opening 19 penetrates the bank side wall 5. The notch 17 and escape opening 19 are provided in the same manner with respect to the projecting wall 13A.

The vertical hole portion 9C is provided with a recessed portion 35 recessed downward in the bottom wall surface 21 forming the bottom surface thereof. The recess 35 is provided on the opposite side of the opening 11 on the bottom wall surface 21 and is adjacent to the outer wall inner surface 5B of the bank side wall 5. Further, the recess 35 is arranged at the center of the opening 11 and the bottom wall surface 21 in the long side direction D2.

As shown in FIG. 5, the folding side wall portion 7 is provided with three connecting arms 25A, 25B, and 25C at equal pitches. Hereinafter, when the connecting arms 25A, 25B, and 25C are collectively referred to without distinction, they will be referred to as "each connecting arm 25" or "connecting arm 25." Each connecting arm 25 projects outward from the one end side 7A of the folding side wall 7. Although FIG. 5 shows one folding-side sidewall 7 corresponding to the bank-side sidewall 5 extending along the long side direction D2, the same applies to other folding-side sidewalls 7. Each connecting arm 25 is provided as follows. Below, among the respective connecting arms 25 shown in FIG. 5, the connecting arm 25C corresponding to the vertical hole portion 9C shown in FIG. 4 will be described as an example.

As shown in FIG. 6, in the connecting arm 25C of the folding side wall 7 in the upright state, the outer edge 27 on the outer wall side of the folding side wall 7 extends along the vertical direction D1. Further, in the connecting arm 25C, the inner wall side surface 29 of the folding side wall portion 7 is composed of a base end portion 29A, an intermediate portion 29B, and a tip end portion 29C. The base end portion 29A is flush with the inner wall of the folding side wall portion 7. The distal end portion 29C is parallel to the inner wall of the folding side wall portion 7, but is provided closer to the outer wall of the folding side wall portion 7 (that is, closer to the outer edge 27) than the base end portion 29A. The intermediate portion 29B is connected to the base end 29A and the distal end 29C, and as it goes from the base end 29A to the distal end 29C, it extends toward the outer wall of the folding side wall 7 (that is, toward the outer edge 27). It is sloping.

Further, at the tip of the connecting arm 25C (that is, the tip of the tip portion 29C), a pair of retaining shafts 31A and 31B are provided in both directions of the long side direction D2 in which the one end side 7A of the folding side wall portion 7 extends. ing. Hereinafter, when the pair of retaining shafts 31A and 31B are collectively referred to without distinction, they will be referred to as "retaining shafts 31." Each of the retaining shafts 31A, 31B protrudes from the tip of the connecting arm 25C (that is, the tip of the tip portion 29C) along the long side direction D2. Of each of the retaining shafts 31A and 31B, a regulating protrusion 33 is provided at the tip of the retaining shaft 31A that faces the adjacent connecting arm 25B. The regulating protrusion 33 protrudes from the tip of the retaining shaft 31A along the long side direction D2. Note that the regulating protrusion 33 may be provided at the tip of the retaining shaft 31B.

As shown in FIG. 5, the regulating protrusion 33 is provided on the side of the connecting arm 25A that faces the adjacent connecting arm 25B (that is, at the tip of the retaining shaft 31B of the connecting arm 25A). It may also be provided on the side opposite to the side facing the connecting arm 25B (that is, at the tip of the retaining shaft 31A of the connecting arm 25A). On the other hand, the connecting arm 25B located between the connecting arm 25A and the connecting arm 25C is not provided with the regulating protrusion 33, but on one side facing the adjacent connecting arm 25A (that is, connecting arm 25B (the tip of the retaining shaft 31A of the connecting arm 25B), the other side facing the adjacent connecting arm 25B (that is, the leading end of the retaining shaft 31B of the connecting arm 25B), or both sides (that is, each retaining shaft 31A, 31B of the connecting arm 25B) A regulating protrusion 33 may be provided at the tip of the holder.

In addition, in the folding side wall portion 7, each retaining shaft 31A, 31B of the connecting arm 25 enters into the bottom wall surface 21 of the vertical hole portion 9 while being guided by the retaining rib 15 of the vertical hole portion 9C of the bank side side wall portion 5. As a result, it is rotatably attached to the bank side wall portion 5.

As shown in FIG. 6, in the connecting arm 25C, a protrusion 23 is provided at the tip 29C of the inner wall side surface 29 of the folding side wall 7. As shown in FIG. The shape of the protrusion 23 is approximately trapezoidal when viewed from the long side direction D2. The protrusion 23 includes a proximal inclined surface 23A, a distal inclined surface 23B, and an intermediate surface 23C. The proximal inclined surface 23A is an inclined surface provided on the proximal end side of the connecting arm 25C in the protrusion 23, and is formed in an outwardly convex curved shape. As a result, the height of the proximal inclined surface 23A from the inner wall surface 29 (that is, the distal end portion 29C) of the folding side wall portion 7 becomes continuous as it goes toward the proximal end of the connecting arm 25C. decreases to The distal end inclined surface 23B is an inclined surface provided on the distal end side of the connecting arm 25C in the protrusion 23, and is formed into an outwardly convex curved surface. As a result, the height of the tip side inclined surface 23B from the inner wall side surface 29 of the folding side wall portion 7 (that is, the tip portion 29C) decreases continuously as it goes toward the tip side of the connecting arm 25C. do. The intermediate surface 23C is a surface provided between the proximal inclined surface 23A and the distal inclined surface 23B, and is formed into an outwardly convex curved surface. However, the tip side inclined surface 23B extends to the tip surface 30 of the connecting arm 25C.

In addition, in the protrusion 23, the proximal side inclined surface 23A and the distal side inclined surface 23B are inclined inwardly in a concave curved shape or in a planar shape, so that the proximal end side of the connecting arm 25C is Alternatively, the height of the folding-side side wall portion 7 from the inner wall side surface 29 (that is, the tip portion 29C) may be formed so as to continuously decrease toward the tip end. Further, the intermediate surface 23C may have a planar shape parallel to the inner wall side surface 29 (that is, the tip end portion 29C) of the folding side wall portion 7. Further, as shown in FIG. 5, the protrusion 23 is also provided on the connecting arm 25A, but not on the connecting arm 25B located between the connecting arm 25A and the connecting arm 25C. However, the protrusion 23 may be provided on the connecting arm 25B.

Next, when the folding side wall 7 rotates from the horizontal position to the upright position, the recess 35 of the vertical hole 9C of the bank side wall 5 and the protrusion 23 of the connecting arm 25C of the folding side wall 7 Explain the relationship between

As shown in FIG. 7, in the folding container 1 that is in the sideways position, the connecting arm 25C of the folding side wall 7 in the sideways position is connected to the opening 11 of the vertical hole 9C of the bank side wall 5. It has been inserted. Further, the projection 23 of the connecting arm 25C enters the recess 35 of the vertical hole 9C from above.

As shown in FIG. 8, in the folding container 1 in the intermediate state, the connecting arm 25C of the folding side wall 7 is rotated from the horizontal position to the upright position. moves upward in the opening 11 of the vertical hole 9C of the bank side wall 5. As a result, in the recess 35 of the vertical hole 9C, the proximal inclined surface 23A of the protrusion 23 of the connecting arm 25C and the middle Surface 23C slides. Therefore, when the folding side wall portion 7 is further rotated toward the upright position, the intermediate surface 23C and the tip side inclined surface 23B of the protrusion 23 slide against the upper part of the side wall surface 35A of the recess 35.

Note that in the recess 35 of the vertical hole 9C, the upper part of the side wall surface 35A may be formed in the shape of a slope extending from the recess 35 toward the opening 11 or in the shape of a curved surface convex outward, unlike in the drawings.

As shown in FIG. 9, when the folding side wall 7 is rotated to the upright position, one end side 7A of the folding side wall 7 is placed on the upper side of the bank side wall 5. As a result, the folded side wall portion 7 becomes upright. In this way, in the folding container 1 in the upright state, the connecting arm 25C of the folding side wall 7 is accommodated in the vertical hole 9C of the bank side wall 5. At this time, the tip of the connecting arm 25C is located above the recess 35 of the vertical hole 9C. As a result, the protruding portion 23 of the connecting arm 25C faces toward the inner wall surface 5A of the bank side wall portion 5.

Next, when the folding side wall 7 rotates from the horizontal position to the upright position, the notch 17 of the vertical hole 9 of the bank side wall 5 and the regulating protrusion of the connecting arm 25 of the folding side wall 7 33 will be explained with reference to FIGS. 10 to 13. 10 to 13, the vertical hole 9A of the bank side wall 5 and the corresponding connecting arm 25A of the folding side wall 7 are shown. Therefore, the relationship between the notch 17 of the vertical hole 9A of the bank side wall 5 and the regulating protrusion 33 of the connecting arm 25A of the folding side wall 7 will be described below as an example of the above relationship.

As shown in FIGS. 10 to 13, within the notch 17 of the vertical hole 9A, the regulating rib 39 extends along the vertical direction D1 at a position facing the regulating protrusion 33 of the connecting arm 25A in the short side direction D3. It is provided. The upper end of the regulating rib 39 is connected to the lower end of the retaining rib 15 of the vertical hole portion 9A. On the other hand, the lower end of the regulating rib 39 is continuous with the bottom wall surface 21 of the vertical hole portion 9A.

The shape of the regulating protrusion 33 of the connecting arm 25A is approximately triangular when viewed from the long side direction D2. As described above, when the folding side wall portion 7 rotates from the horizontal position to the upright position while being guided by the protrusion 23, the regulating protrusion 33 at that time rotates on the upper side of the bottom wall surface 21 of the vertical hole portion 9A. Since it rotates while being positioned between the regulating rib 39 and the relief opening 19, the entire wall surface forming the vertical hole portion 9A (for example, the retaining rib 15, the notch 17, the bottom wall surface 21, the regulating rib 39, etc.) I can't hit it.

However, when the folding side wall 7 rotates from the horizontal position to the upright position, for example, when the folding side wall 7 is pulled inward of the folding container 1, the regulating protrusion 33 moves against the regulating rib 39. However, this suppresses rattling of the folding side wall portion 7.

10 and 11 show the folding container 1 in a folded and sideways state, with the folding side wall portion 7 in the sideways position. In FIG. 12, the folding container 1 is shown in an intermediate state, with the folding side wall portion 7 being at an intermediate position between the horizontal position and the upright position (hereinafter referred to as "intermediate position"). FIG. 13 shows the folding container 1 in an upright position, with the folding side wall 7 in an upright position. In addition, in FIGS. 11 to 13, a part of the projection 23 is shown at the tip of the connecting arm 25A of the folding side wall 7.

Next, when the folding side wall 7 rotates from the horizontal position to the upright position, the notch 17 of the vertical hole 9 of the bank side wall 5 and the retaining shaft of the connecting arm 25 of the folding side wall 7 31 will be explained with reference to FIGS. 14 to 17. 14 to 17 show the vertical hole 9A of the bank side wall 5 and the corresponding retaining shaft 31B of the connecting arm 25A of the folding side wall 7. Therefore, below, as an example of the above relationship, the relationship between the notch 17 of the vertical hole 9A of the bank side wall 5 and the retaining shaft 31B of the connecting arm 25A of the folding side wall 7 will be described.

As shown in FIGS. 14 and 15, in the folding container 1 in the sideways position, the retaining shaft 31B of the connecting arm 25A of the folding side wall 7 in the sideways position is connected to the vertical hole in the bank side wall 5. Between the notch 17 of the portion 9A and the relief opening 19, the notch 17 is placed on the bottom wall surface 21 of the vertical hole portion 9A with a predetermined distance therebetween.

As shown in FIG. 16, in the folding container 1 in the intermediate state, the folding side wall portion 7 is rotated from the horizontal position to the upright position while being guided by the protrusion 23 as described above. When the folding side wall 7 reaches the intermediate position, the retaining shaft 31B of the connecting arm 25C of the folding side wall 7 connects with the notch 17 of the vertical hole 9A of the bank side wall 5 and the relief opening 19. During this period, it rotates while moving upward of the bottom wall surface 21 of the vertical hole portion 9A. Therefore, when the folding side wall portion 7 is further rotated toward the upright position, the retaining shaft 31B of the connecting arm 25C is inserted into the vertical hole portion 9A between the cutout portion 17 and the escape opening 19 of the vertical hole portion 9A. It rotates while being separated from the bottom wall surface 21.

As shown in FIG. 17, when the folding container 1 becomes an upright state by rotating the folding side wall 7 to the upright position, the connecting arm 25A of the folding side wall 7 in the upright position is prevented from coming off. The shaft 31B is spaced apart from the bottom wall surface 21 of the vertical hole section 9A of the bank-side side wall section 5, with a slight distance from the wall surface forming the notch section 17 of the vertical hole section 9A. Go inside.

Therefore, when the folding side wall 7 rotates from the sideways position to the upright position while being guided by the protrusion 23 as described above, the retaining shaft 31B of the connecting arm 25A of the folding side wall 7 at that time rotates. , when it is separated from the bottom wall surface 21 of the vertical hole section 9A of the bank side side wall section 5, it rotates without coming into contact with the entire wall surface forming the vertical hole section 9A. The same holds true for the retaining shaft 31A of the connecting arm 25A of the folding side wall portion 7.

In addition, in FIGS. 15 to 17, a part of the protrusion 23 is visible at the tip of the connecting arm 25A of the folding side wall 7.

As described above in detail, in the folding container 1 of the present embodiment, when the folding side wall 7 is in the sideways position, the protrusion 23 of the connecting arm 25 of the folding side wall 7 is attached to the bank side wall. 5 into the recess 35 of the vertical hole 9 (see FIG. 7). As a result, the retaining shaft 31 of the connecting arm 25 of the folding side wall 7 is placed on the bottom wall surface 21 of the vertical hole 9 of the bank side wall 5 (see FIGS. 14 and 15). When the folding side wall portion 7 rotates from the horizontal position to the upright position, the protrusion 23 of the connecting arm 25 moves against the side wall surface forming the side surface of the recess 35 on the side of the opening 11 of the recess 35 of the vertical hole 9. 35A (see Figure 8). Therefore, when the retaining shaft 31 of the connecting arm 25 separates from the bottom wall surface 21 of the vertical hole section 9, it moves within the vertical hole section 9 without contacting the entire wall surface forming the vertical hole section 9 (see FIGS. 16 and 17). ), breakage of the retaining shaft 31 is prevented.

In the folding container 1 of this embodiment, the connecting arm 25 in the upright position is stored in the vertical hole 9 (see FIG. 9), and the connecting arm 25 in the horizontal position is inserted into the opening 11 of the vertical hole 9. (See FIG. 7), the recess 35, the protrusion 23, and the retaining shaft 31 are gathered in the vertical hole 9. Therefore, in the folding container 1 of the present embodiment, bending moments and the like are unlikely to occur when the folding side wall portion 7 rotates, so that a decrease in strength of the bank side wall portion 5 and the folding side wall portion 7 is prevented. Furthermore, since the folding container of this embodiment can be packed into a small size, it is suitable for downsizing and thinning.

In the folding container 1 of this embodiment, the proximal inclined surface 23A of the protrusion 23 that slides on the side wall surface 35A of the recess 35 is formed into an outwardly convex curved surface, and the proximal end of the connecting arm 25 It is formed in a planar shape in which the height of the folding-side side wall portion 7 from the inner wall side surface 29 decreases continuously as it goes toward the side (see FIG. 6, etc.). Furthermore, the distal end inclined surface 23B of the protrusion 23 that slides on the side wall surface 35A of the recess 35 is formed into an outwardly convex curved surface, and as it goes toward the distal end of the connecting arm 25, it folds. The side wall portion 7 is formed in a planar shape in which the height from the inner wall side surface 29 decreases continuously (see FIG. 6, etc.). Therefore, since the protrusion 23 smoothly slides on the side wall surface 35A of the recess 35, the folding side wall 7 smoothly rotates between the horizontal position and the upright position. In the folding container 1 of this embodiment, the upper part of the side wall surface 35A of the recess 35 on which the protrusion 23 slides is formed in a planar shape extending from the recess 35 toward the opening 11 or in a curved shape convex outward. Since the projection 23 slides more smoothly on the side wall surface 35A of the recess 35, the folding side wall 7 rotates even more smoothly between the horizontal position and the upright position.

In the folding container 1 of this embodiment, the intermediate surface 23C of the protrusion 23 that slides on the side wall surface 35A of the recess 35 is a surface provided between the proximal side inclined surface 23A and the distal side inclined surface 23B. It is formed into a flat shape. Therefore, the folding side wall portion 7 smoothly rotates between the horizontal position and the upright position. This point is the same even if the intermediate surface 23C of the protrusion 23 is formed into an outwardly convex curved surface.

Incidentally, in this embodiment, the long side direction D2 is an example of "the extending direction of one end side."

Note that the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit thereof.
For example, only one of the pair of retaining shafts 31A and 31B may be provided at the distal end of the connecting arm 25 (that is, the distal end of the distal end portion 29C). The vertical hole portion 9 in which such a connecting arm 25 is housed may be the vertical hole portions 9A, 9B, and 9C described above, but may also be the vertical hole portion 9E shown in FIG. 4, for example. Note that a wall surface 12 is provided in the vertical hole portion 9E. Of the pair of sides 11A and 11B of the opening 11 facing each other in the short side direction D3, one side 11A of the wall surface 12, which corresponds to the side where the retaining shaft 31 is not provided in the connecting arm 25, is connected to the opening 11. It is formed by extending to the opposite side.

Furthermore, unlike the two connecting arms 25A, 25C, a connecting arm 25B provided between the two connecting arms 25A, 25C has a protrusion like the folding side wall 7 shown in FIG. 23 may be provided, and both of the pair of retaining shafts 31A and 31B may be omitted.

1 Folding container 3 Bottom wall 4 Edge of bottom wall 5 Bank side wall 5A Inner wall side surface of bank side wall 7 Folding side wall 7A One end side of folding side wall 9 Vertical hole 11 Opening 21 Bottom wall surface 23 Protrusion 23A Proximal inclined surface 23B of protrusion Distal inclined surface 23C of protrusion Intermediate surface 25 of protrusion Connecting arm 29 Inner wall surface 29C of folding side wall Distal end 31 Retention shaft 35 Recess 35A Side wall surface of recess

Claims (3)

A bottom wall portion;
a bank-side side wall portion extending upward from the edge of the bottom wall portion;
a folding side that rotates between an upright position extending upward from the upper end surface of the bank-side side wall and a sideways position lying inward with respect to the bank-side side wall; comprising a side wall portion;
The folding side wall portion is
a connecting arm protruding outward from the folding side wall portion from one end side;
The connecting arm is
a protrusion located at the tip portion and provided on the inner wall side surface of the folding side wall portion;
a retaining shaft protruding in the extending direction of the one end side in at least one direction along the one end side of at least one of the connecting arms provided in the extending direction of the one end side;
The bank side side wall portion is
a vertical hole portion in which the connecting arm is housed in the upright position;
The vertical hole portion is
an opening that is open on an inner wall side surface of the bank side wall portion and into which the connecting arm is inserted when the folding side wall portion is in the sideways position;
a recess provided on the opposite side of the opening of the bottom wall surface forming the bottom of the vertical hole, into which the protrusion of the connecting arm enters when the folded side wall is in the horizontal position; Prepare,
When the folding side wall portion rotates from the horizontal position to the upright position, the protrusion of the connecting arm slides on a side wall surface forming a side surface of the recess on the side of the opening of the recess. In addition, the folding container is characterized in that the retaining shaft is spaced apart from the bottom wall surface of the vertical hole and moves within the vertical hole without contacting the entire wall surface forming the vertical hole. The upper part of the side wall surface of the recess is formed in a planar shape extending from the recess toward the opening or in an outwardly convex curved shape,
The protrusion is
The proximal end side of the connecting arm of the protrusion is formed into a planar shape in which the height from the inner wall side surface of the folding side side wall portion decreases continuously as the protruding portion goes toward the proximal end side of the connecting arm. a proximal inclined surface,
The distal end side of the connecting arm of the protrusion is formed into a planar shape in which the height from the inner wall side of the folding side wall portion decreases continuously as the protruding portion moves toward the distal end side of the connecting arm. The collapsible container according to claim 1, further comprising a tip side inclined surface. The protrusion is
3. A surface provided between the proximal side inclined surface and the distal side inclined surface, comprising an intermediate surface formed in a planar shape or an outwardly convex curved shape. folding container.

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