JP6588267B2 - container - Google Patents

Description

  The present invention relates to a stackable container.

  Conventionally, when this type of container is in a stacked state, the concave and convex engaging portions formed on the upper surface of the side wall of the lower container and the outer edge of the lower surface of the upper container are engaged with each other to form the concave and convex sides. What prevents the bulging deformation | transformation of the side wall of the container of this is known (for example, refer patent document 1).

Japanese Patent Laying-Open No. 2015-85975 (paragraph [0039], FIG. 7, FIG. 8, FIG. 9)

  By the way, in general, when performing a so-called destacking operation in which a group of containers in a stacked state are transported by dividing them into individual containers, for example, the lower tier is placed in a tilted posture by placing one hand on one side wall of the upper tier container. There is a case where an operation of sliding on the container on the side and pulling it toward the front is performed.

  However, in the conventional container described above, even when the upper container is pulled in an inclined posture, the concave and convex engagement between the concave and convex engaging part of the upper container and the concave and convex engaging part of the lower container is smooth. Therefore, there is a problem that the work cannot be efficiently performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a container that can efficiently perform a staging operation.

In order to achieve the above object, the invention according to claim 1 is characterized in that, when containers are stacked, irregularities formed on the upper surface of the side wall of the lower container and the outer edge of the lower surface of the upper container, respectively. A container in which the engaging portions are engaged with each other to prevent the lower container from bulging and deforming outward of the side wall, and is provided in the uneven engaging portion at the outer edge of the lower surface in the vertical direction. When the container on the upper stage, which is inclined and stacked, is pulled horizontally with an inclined posture with one side having the concave-convex engagement part as a fulcrum, the concave-convex engagement part of the container on the upper stage As a part of the upper surface, the concave and convex portions of the lower surface outer edge are provided with an engaging slope that slides in contact with the concave and convex portions of the lower container and moves the concave and convex portions of the upper container upward. Above the engaging slope of the engaging part The portion is provided with a locking surface whose inclination angle with respect to the vertical direction is smaller than the engaging slope, and when the containers are stacked, the locking surface of the container on the upper side is The upper container is lifted on the other side with the one side as a fulcrum, and the upper and lower concave and convex engaging portions are engaged on the other side. When the problem is just solved, the locking surface of the upper container on the one side is a container that does not face the concave and convex engaging portion of the lower container in the horizontal direction .

A second aspect of the present invention is the container according to the first aspect, wherein the concave-convex engaging portion having the engaging slope is disposed at positions near both ends of the side wall in the lateral direction.

[Invention of Claim 1]
In the container according to the first aspect, when the stacked state is reached, the concave and convex engaging portions of the upper and lower containers are engaged with each other to prevent bulging deformation to the outside of the side wall of the lower container. Since the engaging slope is provided in the concave / convex engaging portion on the outer edge of the lower surface of the container, when the upper container is pulled horizontally with the tilted posture, the engaging slope becomes the concave / convex engagement of the upper container. As a part of the joint, it slides on the concave and convex engaging portion of the lower container and moves the concave and convex engaging portion of the upper container upward so that the concave and convex engaging portions of the upper and lower containers can be easily engaged. It can be removed, and the work can be performed efficiently.

In addition, a locking surface having an inclination angle with respect to the vertical direction smaller than the engaging slope is provided on the upper side of the engaging slope of the concavo-convex engaging portion on the outer edge of the lower surface of the container of claim 1 . When the containers are stacked, the locking surface of the upper container faces the concave and convex engaging portion of the lower container in the horizontal direction. Thereby, the bulging deformation | transformation to the outer side of the side wall of the container of the lower stage is reliably prevented in the stacked state of containers. In addition, when the upper side container is lifted on the other side with one side as a fulcrum, and the upper and lower side uneven engagement parts are just released on the other side, the upper side container is locked on one side. The surface does not face the concave-convex engaging portion of the lower container in the horizontal direction. Thus, when the upper container is slid in an inclined posture, the concave and convex engagements of the concave and convex engaging portions of the upper and lower containers can be easily removed, and the leveling work can be performed efficiently.

[Invention of claim 2 ]
In the invention of claim 2, the concave-convex engaging portion having the engaging slope is disposed at positions near both ends in the lateral direction of the side wall, and the positions near both ends in the lateral direction of the side wall are less likely to be deformed than the central portion. The concave / convex engaging parts of the upper and lower containers are stably engaged with the concave / convex, and when the upper container is slid in the inclined position, the upper container's engaging slope is the concave / convex engagement of the lower container. Slidably contact the part.

The perspective view of the container which concerns on 1st Embodiment of this invention. Partially enlarged perspective view of container Perspective view of the container in the folded state Partially enlarged perspective view of a folded container Perspective view of the bottom side of the container Partially enlarged perspective view of the lower surface side of the container Partially enlarged perspective view of the lower surface side of the container Perspective view of stacked containers Partially enlarged perspective view of container in stacked state Side view of stacked containers Partially enlarged side sectional view of a stacked container One-sided cross-section of a stacked container Partially enlarged side sectional view of a stacked container Perspective view of containers stacked in a folded state Perspective view of container according to reference example Perspective view of the bottom side of the container Side sectional view of the bottom side of the container Partially enlarged side sectional view of the bottom side of the container

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The container 10 of the present embodiment shown in FIG. 1 is a so-called folding container having a rectangular parallelepiped shape (for example, 900 [mm] × 500 [mm]) and an open top surface. The pair of first side walls 20, 20 are rotatably connected to the pair of first bank portions 17, 17 protruding from the pair of short side portions of the outer edge portion of the bottom wall 11. A pair of second side walls 30, 30 are rotatably connected to a pair of second bank portions 12, 12 protruding from the long side portion of the first bank. The first bank portion 17 is lower than the second bank portion 12, and a pair of first side walls 20, 20 are folded on the bottom wall 11 between the first bank portions 17, 17 as shown in FIG. 3. And then, the pair of second side walls 30 and 30 are folded on the first side walls 20 and 20 to be accommodated between the second bank portions 12 and 12 so that the entire container 10 is folded. be able to.

  The first side wall 20 and the second side wall 30 are restricted from turning outward from the standing posture by their turning support structure. In addition, as shown in FIG. 2, the first side wall 20 is also restricted from rotating outwardly from the standing posture by supporting both side edges from the outside by the side protruding walls 36 protruding from the second side wall 30. In addition, the second side wall 30 can be rotated outward from the standing posture by engaging protrusions (not shown) protruding from both side edges of the first side wall 20 with a protruding wall hole 36A formed in the side protruding wall 36. Movement is regulated.

  A pair of lock bars 29, 29 are arranged symmetrically on the outer surface upper part of the first side wall 20 and extend in the lateral direction, and the tip portions of these lock bars 29, 29 are shown on the second side walls 30, 30. Not engaged with the side hole. As a result, the first side walls 20 and 20 are restrained from turning inward and held in a standing posture, and the second side walls 30 and 30 are restricted from turning inward by the first side walls 20 and 20 in the standing posture. And held in a standing posture. Further, when the lock operation portion 28 at the upper center of the outer surface of the first side wall 20 is operated, the pair of lock bars 29 and 29 move to the side approaching each other, and the side hole (not shown) of the second side wall 30 The engagement is released, and the first side wall 20 can be tilted inward. As a result, the second side wall 30 can also be tilted inward. When the operation of the lock operation unit 28 is stopped, the lock bars 29 and 29 return to the lock position where the lock bars 29 and 29 can be engaged with the side holes of the second side wall 30 by the elastic force of an elastic member (not shown).

  As shown in FIG. 2, first to fifth lateral ribs 22 </ b> A are provided on the outer surface of the first side wall 20 from the upper end to the upper end position at a predetermined interval. Among them, the third and fourth lateral ribs 22A and 22A are divided in the center in the lateral direction by a pair of longitudinal ribs 22B and 22B, and a mechanism room 20H is formed between the pair of longitudinal ribs 22B and 22B. ing. The above-described lock operating portion 28 is accommodated in the mechanism chamber 20H, and the above-described lock bars 29, 29 are directly attached to portions sandwiched between the third and fourth lateral ribs 22A, 22A on both sides of the mechanism chamber 20H. Is accepted by the movement.

  A handle portion 20Z is provided on the lower surface side of the fifth lateral rib 22A adjacent to the mechanism room 20H from below. The handle portion 20Z has a horizontally long strip plate wall 22D suspended from the distal end of the lateral central portion of the fifth lateral rib 22A, and both end portions of the strip plate wall 22D extending downward from the fifth lateral rib 22A. It is connected to the pair of vertical ribs 22E and 22E, and has a hood shape with an open bottom surface.

  The first lateral rib 22A is cut off at the outer edge side at positions close to both ends in the lateral direction, whereby a pair of first engagements corresponding to the “concave engagement portion” of the present invention is formed on the upper surface of the first side wall 20. Joint recesses 24, 24 are formed. Moreover, the inner surface located in the middle of the wall thickness direction of the 1st side wall 20 among each 1st engagement recessed parts 24 is the engagement surface 24A engaged with the 1st engagement protrusion 40 mentioned later. In the engagement surface 24A, a lower portion than the first lateral rib 22A is a cavity, and the cavity is divided by the longitudinal rib 22F. In addition, longitudinal ribs 22F that communicate between the first and second lateral ribs 22A and 22A are also provided on both side portions of the first engaging recess 24. Furthermore, as shown in FIG. 11, the engagement surface 24A is inclined so as to go outward as it goes downward. The inclination angle of the engagement surface 24A with respect to the vertical direction is, for example, about 6 to 8 degrees.

  As shown in FIG. 2, the outer edge portion of the first lateral rib 22A is also cut away from the lateral center of the first side wall 20 to the positions closer to the first engagement recesses 24, 24. A second engagement recess 25 corresponding to the “concave / engagement portion” of the present invention is formed on the upper surface of the side wall 20. An inner surface of the second engagement recess 25 located in the middle of the first side wall 20 in the wall thickness direction is an engagement surface 25A that engages with a second engagement protrusion 45 described later. Also, the engagement surface 25A also has a cavity below the first lateral rib 22A, and the cavity is divided by a plurality of vertical ribs 22F. Furthermore, the engagement surface 25A of the second engagement recess 25 is disposed at a position slightly shifted from the engagement surface 24A of the first engagement recess 24 toward the outer surface side of the first side wall 20, and the first engagement It is parallel to the engagement surface 24 </ b> A of the recess 24. In addition, inclined ribs 22 </ b> G and 22 </ b> G that are inclined toward the center in the lateral direction of the second engagement recess 25 are provided on both sides of the second engagement recess 25.

  As shown in FIG. 1, first to fourth lateral ribs 32 </ b> A are provided on the outer surface of the second side wall 30 at a predetermined interval from the upper end toward the upper end. The amount of protrusion of the first lateral rib 32A from the outer surface of the second side wall 30 is about half of the amount of protrusion of the second to third lateral ribs 32A from the outer surface of the second side wall 30. Thereby, a rail portion 33 having a stepped structure is formed on the upper portion of the second side wall 30. The upper surface 33A of the rail portion 33 is substantially flush with the upper surface of the first side wall 20. In addition, the second lateral rib 32A is interrupted at positions near the both ends in the lateral direction of the entire second side wall 30. As a result, the lower step surface 33B of the rail portion 33 has a stepped shape at both ends. It has become.

  Handle portions 30H and 30H are formed at two positions of the fourth lateral rib 32A that are symmetrical with respect to the center in the longitudinal direction. Each handle 30H cuts a part of the fourth lateral rib 32A over a predetermined length to form an opening, and the intermediate lateral rib 32B having the same length as the opening is formed by the third and fourth. A hood structure is provided between the lateral ribs 32A and 32A and directly above the opening, and the outer wall of the intermediate lateral rib 32B is connected to the opening edge of the opening by a cover wall 32C. A band-shaped mark 30 </ b> M is formed on the upper edge of the inner surface of the second side wall 30. Each belt-shaped mark 30M has the same length as the handle portion 30H, and is disposed at the same position as each handle portion 30H in the lateral direction of the second side wall 30. The entire upper edge portion of the inner surface of the second side wall 30 is slightly depressed with respect to the entire inner surface of the second side wall 30, and the band-shaped mark 30 </ b> M is formed with respect to the entire upper edge portion of the second side wall 30. It protrudes slightly in a stepped shape.

  As shown in FIG. 2, side edge protrusions 35 protrude from both side edges of the outer surface of the second side wall 30. The side edge protrusion 35 is bent in a crank shape in the middle in the up-down direction, and the first protrusion 35A on the upper side of the bent part is formed on the second side wall 30 with respect to the second protrusion 35B on the lower side. It is shifted to the center in the horizontal direction. In addition, a step portion formed between the outer surface of the second side wall 30 located directly above the second protrusion 35B and the first protrusion 35A is a protrusion receiving portion 34. As shown in FIG. 14, when the containers 10 are stacked in a folded state, first and second engaging protrusions 40 and 45, which will be described later, of the upper container 10 become lower container 10. Is received by the protrusion receiving portion 34.

  As shown in FIG. 5, a fitting protrusion 19 protrudes from the entire surface excluding the outer edge portion on the lower surface of the container 10 (that is, the lower surface of the bottom wall 11). The fitting protrusion 19 surrounds the outer edge of the lattice-shaped rib with an annular rib. Further, the height of the fitting protrusion 19 is substantially the same as the height of the rail protrusion 33T (see FIGS. 1 and 2) above the lower step surface 33B of the rail part 33. In addition, the part except the outer edge area | region and the center area | region of the longitudinal direction among the fitting protrusions 19 is slightly depressed.

  As shown in FIG. 5, a pair of first lower surface side protrusions 14, 14 are sequentially formed on the outer edges of the pair of long sides of the lower surface of the bottom wall 11 from both ends toward the center position. A pair of second lower surface side protrusions 15 and 15 and a pair of extension mechanism portions 16 and 16 are formed in order. The first lower surface side protrusion 14 has a rectangular parallelepiped shape extending along the long side of the bottom wall 11. The second lower surface side protrusion 15 extends in a rail shape from a position away from the first lower surface side protrusion 14 to the center side of the long side of the bottom wall 11, and is inclined to the first lower surface side protrusion 14 side. On the other hand, it has a vertical surface on the extension mechanism portion 16 side. The extension mechanism portion 16 is provided with a plurality of lower surface side ribs 12L on the inner surface of the extension wall 12F depending from the outer surface of the second bank portion 12. Moreover, between the 1st and 2nd lower surface side protrusions 14 and 15 and the extension mechanism part 16, those lower surfaces and those inner surfaces by the side of those fitting protrusions 19 become flush. Yes.

  As shown in FIG. 3, a central protrusion 12 </ b> T is provided on the upper surface of each second bank 12 in the bottom wall 11 at the center in the longitudinal direction. The central protrusion 12T is formed over the entire width direction of the second bank portion 12 with a rectangular shape extending in the longitudinal direction of the second bank portion 12, and the height of the central protrusion 12T is fitted. It is substantially the same as the mating protrusion 19.

  As shown in FIG. 4, both end portions in the longitudinal direction of the second bank portion 12 form stepped portions 12D that are stepped and lowered, and the inside of the end portion of the second bank portion 12 that includes these stepped portions 12D. Is provided with a corner protrusion 12A. The corner protrusion 12 </ b> A has an L-shaped planar shape, one side thereof is integrated with the end of the first bank portion 17, and the other side is connected to the inner surface of the second bank portion 12.

  12 A of corner protrusions protrude upwards from the upper surface of the 2nd bank part 12 whole. Further, when the container 10 is in the folded state, the upper surface of the side edge protrusion 35 of the second side wall 30 and the upper surface of the corner protrusion 12A are substantially flush with each other. Then, as shown in FIG. 14, when another container 10 is stacked on the folded container 10, the fitting protrusion 19 of the upper container 10 becomes the corner protrusion 12 </ b> A of the lower container 10. The corner protrusion 12A and the side edge protrusion 35 of the lower container 10 are brought into contact with the periphery of the fitting protrusion 19 on the lower surface of the upper container 10 by fitting inside the group. In this state, the central protrusion 12T of the lower container 10 is received in the lower surface recess 12S provided between the extension mechanisms 16 and 16 in the upper container 10, and the first container 10 of the upper container 10 is received as described above. The second engaging protrusions 40 and 45 are received by the protrusion receiving part 34 of the lower container 10.

  As shown in FIG. 5, a pair of first engagement recesses 24, 24 and a second engagement recess 25 on the upper surface of the first side wall 20 are formed on the outer edge of the pair of short sides of the lower surface of the container 10. A pair of first engagement protrusions 40 and 40 and one second engagement protrusion 45 corresponding to the above are formed as the “concave engagement part” according to the present invention. Then, as shown in FIG. 8, when the containers 10 and 10 are stacked, the fitting protrusion 19 of the upper container 10 is fitted into the upper surface opening 10K of the lower container 10 as shown in FIG. As shown in FIG. 9, the first and second engaging protrusions 40, 45 of the upper container 10 are provided in the first and second engaging recesses 24, 25 of the lower container 10, as shown in FIG. Engage with irregularities.

  Specifically, as shown in FIG. 6, the first engagement protrusion 40 has an inward inclined surface 41 inclined toward the up and down direction toward the inner side (that is, the fitting protrusion 19 side), and the outer side (that is, the engagement protrusion 19 side). It has an outward slope 42 that faces the opposite side of the fitting protrusion 19 and is inclined with respect to the vertical direction. The inward inclined surface 41 is formed from the lower end of the first engagement protrusion 40 to the upper end position, and at the end of the first engagement protrusion 40 on the side away from the second engagement protrusion 45. The inwardly inclined surface 41 is extended as an extended inclined portion 41 </ b> A to the upper end of the first engaging protrusion 40. In addition, the inclining angle of the inwardly inclined surface 41 with respect to the vertical direction is such that the containers 10 are stepped and the first side wall 20 side of the upper side container 10 is lifted and the first side wall 20 below the one side wall 20 is raised. The first and second engaging protrusions 40 and 45 are just disengaged from the first and second engaging recesses 24 and 25 of the lower container 10. It is larger than the inclination angle of the container 10 on the upper stage side. Specifically, the inclination angle of the inward slope 41 with respect to the vertical direction is, for example, 50 to 60 degrees.

  On the other hand, as shown in FIG. 7, the outward slope 42 is formed from the lower end of the first engaging projection 40 to a position closer to the lower end. Further, the inclination angle of the outward slope 42 with respect to the vertical direction is, for example, 40 to 50 degrees. Furthermore, side surfaces 43 other than the inwardly inclined surface 41 and the outwardly inclined surface 42 of the first engaging protrusion 40 are substantially parallel to the vertical direction.

  As shown in FIGS. 6 and 7, the second engagement protrusion 45 also faces the fitting protrusion 19 side and the inwardly inclined surface 46 that is inclined with respect to the vertical direction, and faces the opposite side of the fitting protrusion 19. And an outward slope 47 inclined with respect to the vertical direction. In addition, the inward slope 46 is formed from the lower end of the first engagement protrusion 40 to a position near the upper end, while the outward slope 47 is formed from the lower end of the first engagement protrusion 40 to a position near the lower end. Has been. Further, the upper portion of the second engaging protrusion 45 shown in FIG. 6 above the inwardly inclined surface 46 forms a locking surface 48A according to the present invention, and is inclined, for example, about 10 to 11 degrees with respect to the vertical direction. Yes. Furthermore, the outer side surface 48B located above the outward slope 47 among the second engagement protrusions 45 shown in FIG. 7 is substantially parallel to the vertical direction.

  Note that the inwardly inclined surface 46 of the second engaging protrusion 45 is not provided with a portion corresponding to the extended inclined part 41 </ b> A of the inwardly inclined surface 41 of the first engaging protrusion 40. Further, both side surfaces of the second engaging protrusion 45 are inclined to the side approaching each other toward the lower side to form a pair of side inclined surfaces 49, 49.

  Although not shown, the inward slope 46 of the second engagement protrusion 45 is similar to the positional relationship between the engagement surface 24A of the first engagement recess 24 and the engagement surface 25A of the second engagement recess 25 described above. The first engaging protrusion 40 is arranged parallel to the inwardly inclined surface 41 and slightly shifted away from the fitting protrusion 19. And these inward slopes 41 and 46 are "engagement slopes" concerning the present invention. The outward slope 47 of the second engagement protrusion 45 is flush with the outward slope 42 of the first engagement protrusion 40.

  This completes the description of the configuration of the container 10 of the present embodiment. Next, the effect of this container 10 is demonstrated. The container 10 of the present embodiment can be lifted by placing its hands on the handle portions 20Z and 20Z with its longitudinal direction lying sideways, or by placing both hands on the handle portions 30H and 30H with its short direction oriented sideways. It can also be lifted. Hereinafter, stacking and stacking work in the case where the container 10 is handled with the short side facing sideways will be described.

  When stacking the containers 10, the operator places the container 10 on the upper stage side in an inclined posture with one end in the longitudinal direction lowered, and sets the lower end of the second side walls 30, 30 in the container 10 on the lower stage side. It hits an arbitrary middle position on the upper surface of. At this time, there is a concern that the second side walls 30 and 30 of the lower container 10 expand outward, and the upper container 10 falls into the lower container 10. Between the joint protrusion 19 and the first lower surface side protrusions 14 and 14 on both sides thereof, the rail protrusions 33T and 33T on the upper side of the second side walls 30 and 30 of the lower container 10 are sandwiched, and the second Since the expansion of the side walls 30, 30 is suppressed, there is no fear of dropping as described above.

  Next, the upper container 10 in the inclined posture is slid on the second side walls 30, 30 of the lower container 10 to be offset. That is, one end portion in the longitudinal direction of the upper container 10 is moved to one end portion in the longitudinal direction of the lower container 10. Then, the outer surface 48B (see FIG. 7) of the second engagement protrusion 45 at one end of the upper container 10 abuts on the inner surface of the first side wall 20 of the lower container 10. At this time, the outer side surface 48B of the second engagement protrusion 45 is inclined with respect to the vertical direction along with the inclination of the upper container 10, so that the upper container 10 is moved to the lower container in this state. 10 toward the first side wall 20, the outer surface 48 </ b> B of the second engagement protrusion 45 of the upper container 10 slides on the first side wall 20 of the lower container 10 and the upper container 10. One end moves upward. Then, the outward slope 47 (see FIG. 7) of the second engagement protrusion 45 and the first engagement are inclined at an angle nearer to the outer surface 48B of the second engagement protrusion 45 in the lower container 10 than the outer surface 48B. The outward slope 42 (see FIG. 7) of the mating protrusion 40 is in sliding contact with the first side wall 20 of the lower container 10, and the first and second engaging protrusions 40, 45 of the lower container 10 are in contact with each other. It rides on the first side wall 20 of the lower container 10 and engages with the first and second engaging recesses 24 and 25 of the first side wall 20 in an uneven manner. In this state, when the other end of the upper container 10 is lowered, the first and second engaging protrusions 40 and 45 of the upper container 10 are also connected to the first and second lower containers 10 on the other end. The second engaging recesses 24 and 25 engage with the concave and convex portions, and the upper container 10 is placed in a horizontal posture and stacked on the lower container 10 (see FIG. 10).

  Here, in the stacked state of the containers 10, there is a case where an operation of pulling the handle 20 </ b> Z of the lower container 10 is performed, and at this time, the first side wall 20 of the lower container 10 is inflated. There is a concern that However, as shown in FIG. 9, the first and second engaging protrusions 40 and 45 of the upper container 10 are unevenly connected to the first and second engaging recesses 24 and 25 of the lower container 10. As a result, large bulging deformation of the first side wall 20 of the lower container 10 is prevented.

  Further, when the handle portion 20Z is pulled, the first side wall 20 is deformed so that the center in the lateral direction projects outward as compared with the both side portions. On the other hand, in the container 10 of the present embodiment, the first side wall 20 is deformed. The second engaging protrusion 45 disposed at the center in the lateral direction of the side wall 20 includes an extended inclined portion 41A of the first engaging protrusion 40 disposed at a position closer to the both side portions of the first side wall 20 in the lateral direction. Since there is no equivalent and the engagement surface 48A of the second engagement protrusion 45 that is substantially parallel to the upper direction contacts the engagement surface 25A of the second engagement recess 25, the container 10 on the lower stage side The bulging deformation of the first side wall 20 is effectively suppressed.

  Now, when stacking containers 10 in a stacked state, it is performed as follows. The worker places his / her hand on the handle portion 20Z on the first side wall 20 at one end of the container 10 on the upper stage side and lifts the handle 10Z into an inclined posture as shown in FIG. At this time, the upper side container 10 is lifted on the other side with one side as a fulcrum, and the concave and convex engagement between the upper and lower second engaging projections 45 and the second engaging concave portion 25 is just canceled on the other side. And the locking surface 48A of the second engaging protrusion 45 of the upper container 10 on one side is not horizontally opposed to the locking surface 25A of the second engaging recess 25 of the lower container 10. Thus, the inwardly inclined surface 46 of the second engagement protrusion 45 faces the engagement surface 25 </ b> A of the second engagement recess 25. Further, as shown in FIG. 13, the inwardly inclined surface 41 of the first engagement protrusion 40 also faces the engagement surface 24 </ b> A of the first engagement recess 24 in the horizontal direction.

  Here, when the container 10 is inclined, the inclination angle of the inwardly inclined surfaces 41 and 46 of the first and second engaging protrusions 40 and 45 with respect to the vertical direction is larger than when the container 10 is in a horizontal posture. The angle of inclination of the container 10 when the one end of the container 10 is lifted from the stacked state is usually an angle (for example, about 15 to 30 degrees) at which the internal luggage does not collapse. The inclination angle of the inwardly inclined surfaces 41, 46 of the first and second engaging protrusions 40, 45 with respect to the vertical direction is larger than that (for example, 50 to 60 degrees as described above), so that the container Even when 10 is inclined, the inwardly inclined surfaces 41 and 46 of the first and second engaging protrusions 40 and 45 are inclined with respect to the vertical direction, so that the first and second engaging recesses 24, 25 engagement surfaces 24A, 25A Opposed to each other.

  Even if the inclination angle of the inclined posture of the container 10 is extremely small, in the container 10 of the present embodiment, the upper and lower second engaging protrusions 45 and the second engagement on the opposite side to the inclination fulcrum. When the concave-convex engagement with the mating recess 25 is just canceled, the locking surface 48A of the second engagement protrusion 45 of the upper container 10 on the fulcrum side becomes the second engagement recess 25 of the lower container 10. The extending inclined portion 41A formed by extending the inwardly inclined surface 41 reliably faces the engaging surface 24A of the first engaging recess 24 in the horizontal direction. Accordingly, when the upper container 10 in the inclined posture is pulled forward, the inwardly inclined surfaces 41 and 46 of the first and second engaging protrusions 40 and 45 of the upper container 10 (including the extended inclined portion 41A). Is in sliding contact with the engaging surfaces 24A, 25A of the first and second engaging recesses 24, 25 of the lower container 10, and the first and second engaging protrusions 40, 45 of the upper container 10 are touched. Can be smoothly removed from the first and second engaging recesses 24 and 25 of the lower container 10 and the upper container 10 can be easily pulled to the near side. As a result, efficient spreading work can be performed.

[Reference example]
The container 10V of the present embodiment is shown in FIGS. 15 to 18 and has a structure in which the planar shape is a rectangle and the upper surface is open and cannot be folded. Further, as shown in FIG. 15, L-shaped engagement protrusions 50 are provided at the four corners of the upper surface of the container 10V, while, as shown in FIG. 16, L-shaped engagement recesses are formed at the lower four corners of the container 10V. 60 is provided. Further, the engaging protrusion 50 and the engaging recess 60 correspond to the “concave engaging portion” in the claims .

As shown in FIG. 15, the engaging protrusion 50 includes a first protrusion 51 that extends along the upper surface of the first side wall 20 and a second protrusion 52 that extends along the upper surface of the second side wall 30. One end is connected to each other. The other ends of the first and second protrusions 51 and 52 are inclined surfaces 51S and 52S that rise gently from the upper surfaces of the first and second side walls 20 and 30. As shown in FIG. 18, the outer surface of the first protrusion 51, the engagement slope 51A is formed over the lower end position near the upper end, the lower portion than the engagement slope 51A, taken locking surface 51B Yes. Further, the engaging slope 51A is inclined in a range of 30 to 60 degrees with respect to the vertical direction, and the locking surface 51B is substantially parallel to the vertical direction. Furthermore, the entire inner surface 51C of the first protrusion 51 is substantially parallel to the vertical direction.

  On the other hand, the outer surface 52A and the inner surface 52C (see FIG. 15) of the second protrusion 52 are generally parallel to the vertical direction. The second protrusion 52 may have the same structure as the first protrusion 51 (that is, the outer surface 52A of the second protrusion 52 may be an “engagement slope”).

  As shown in FIG. 16, the engagement recess 60 includes a first groove 61 that receives the first protrusion 51 of the engagement protrusion 50 and the second of the engagement protrusion 50 when the containers 10 </ b> V are stacked. It comprises a second groove 62 that receives the protrusion 52. A plurality of vertical ribs 63 are provided on a portion of the inner surface of the first groove 61 facing the engaging slope 51A and the locking surface 51B of the first protrusion 51. As shown in FIG. 18, the front end surface of the vertical rib 63 forms a locking surface 63B from the upper end to the lower end position, and the lower side from the lower end position is the engaging slope 63A. There is no portion corresponding to the vertical rib 63 of the first groove 61 on the inner surface of the second groove 62, and the entire surface is a flat surface substantially parallel to the vertical direction.

  In the container 10V of the present embodiment, as shown in FIG. 17, when the container 10V is in a stacked state, the engaging protrusion 50 of the lower container 10V engages with the engaging recess 60 of the upper container 10V, and this Accordingly, the lateral displacement between the containers 10V and 10V and the bulging deformation of the first side wall 20 of the lower container 10V are suppressed. Specifically, in the longitudinal direction of the container 10V, the lower end portion of the locking surface 63B of the vertical rib 63 in the engagement recess 60 abuts the upper end portion of the locking surface 51B of the first protrusion 51, and the container 10V , 10V lateral displacement and bulging deformation are reliably prevented. Further, in the short direction of the container 10V, the vertical inner surface of the second groove 62 abuts on the outer surface 52A of the second protrusion 52, and the lateral displacement and bulging deformation between the containers 10V and 10V are prevented.

  At the time of spreading, the upper container 10V is placed in an inclined posture by placing a hand on one handle 20Z. Then, since the engaging slope 63A of the vertical rib 63 in the engaging recess 60 and the engaging slope 51A of the first protrusion 51 face each other in the horizontal direction, it is easy to pull the container 10V on the upper stage as it is. The concave-convex engagement between the engaging protrusion 50 of the lower container 10V and the engaging recess 60 of the upper container 10V is released. As a result, efficient spreading work can be performed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the present invention can be implemented with various modifications other than those described above without departing from the scope of the invention.

10,10V container 24 1st engagement recessed part (unevenness engagement part)
25 Second engagement recess (concave engagement portion)
40 1st engagement protrusion (unevenness engagement part)
41, 46 Inward slope (engagement slope)
45 Second engagement protrusion (concave / convex engagement portion)
48A, 51B, 63B Locking surface 50 Engagement protrusion (concave engagement part)
51A, 63A Engagement slope 60 Engagement recess (concave engagement part)

Claims (2)

When the containers are stacked, the concave and convex engaging portions formed on the upper surface of the side wall of the lower container and the outer edge of the lower surface of the upper container are engaged with each other so that the lower container A container for preventing bulging deformation to the outside of the side wall,
The container on the upper stage, which is provided in the concave-convex engaging portion of the outer edge of the lower surface and is inclined with respect to the vertical direction, is placed in a tilted posture with one side having the concave-convex engaging portion as a fulcrum, and is horizontally As a part of the concave and convex engaging portion of the upper container, the concave and convex engaging portion of the upper container is slidably contacted with the concave and convex engaging portion of the lower container. It has an engaging slope that moves upward ,
A locking surface having an inclination angle with respect to the vertical direction smaller than the engaging slope is provided on the upper portion of the concave and convex engaging portion of the lower surface outer edge portion from the engaging slope.
When the containers are stacked, the locking surface of the upper container is horizontally opposed to the concave and convex engaging portion of the lower container, and the upper container is When the other side is lifted with the one side as a fulcrum, and the concave / convex engagement of the upper and lower concave / convex engaging portions is just canceled on the other side, the locking surface of the upper container on the one side is A container that does not face the concave and convex engaging portion of the lower container in the horizontal direction . The container according to claim 1, wherein the concave-convex engaging portion having the engaging slope is disposed at a position near both ends in the lateral direction of the side wall.

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