JP2006213344A - Box-shaped container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box-shaped container (especially, the box-shaped container made of a foamed resin) a plurality of which can be stably step-stacked in the vertical direction even when dimensional deflection of the container is large. <P>SOLUTION: An engaging projection 6 is provided on the upper end parts of side walls 3 and 4 of the box-shaped container along the peripheral edge of the upper end of the container, and the engaging projection 6 has an engaging outer face 62 the upper end of which is inclined so as to fall on the inside of the container. On the lower face side of a bottom wall 2 of the box-shaped container, an engaging projection 8 as a leg part which can be engaged on the engaging projection 6 on the upper end of the side walls of the container at the lower position than the position of the container when the containers are step-stacked is provided along the peripheral edge of the lower end of the container. The engaging projection 8 has an engaging inner face the lower end of which is inclined so as to fall outside of the container by an angle of inclination approximately corresponding to the angle of inclination of the engaging outer face 62. At respective corner parts of the box-shaped container, the corner parts 6C of the engaging projection 6 on the upper ends of the side walls are made into cutout shapes toward the inside of the container so that the engaging outer faces 62 of the engaging projection on the adjoining two side walls 3 and 4 turn discontinuously separated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a box-shaped container, and more particularly to a box-shaped container having a structure in which a plurality of containers can be stacked vertically.

  Various structures that make it possible to stack containers made of synthetic resin are known. For example, in the cleaning container disclosed in Patent Document 1, a flange having a taper that faces downward is provided on the upper opening edge of each side wall of the container whose upper surface is open, and the outer side surface of each side wall is vertical. An inclination corresponding to the taper of the flange is also given to the lower end portion of the side rib extending in the direction. When this container is stacked up and down, the tapered lower end of the side rib of the upper container is placed on the tapered flange of the lower container, and based on the taper engagement relationship between the flange and the lower end of the side rib. Stable stacking without backlash or misalignment is achieved. However, in the structure of Patent Document 1, since the contact mode of each side rib lower end with respect to the upper surface of the flange is a so-called line contact, there is no problem when the container constituent material is hard or highly rigid. If the material is relatively soft or has low rigidity, there remains anxiety in maintaining strength during stacking.

  Patent Document 2 discloses a container made of Styrofoam (container for refrigerator) which is a relatively soft and low-rigid material (the member numbers in this paragraph and the next paragraph indicate the numbers used in Patent Document 2). . This container consists of a bottomed box-shaped container body 1 and a container lid 2, and can be stacked by placing the container body 1 of the upper container on the lid 2 of the lower container. And while providing the engagement rib 4 which protrudes upward along the inner edge of the upper edge of the opening part of the container main body 1, the engagement recessed part 9 which the said engagement rib 4 fits in the lower surface side of the container lid 2 is provided. Yes. According to the drawing of Patent Document 2, the engagement surface of the engagement rib 4 is provided with a taper inclination such that the upper end of the engagement rib 4 falls to the inside of the container, and the engagement surface of the engagement recess 9 on the container lid lower surface side is provided. Is provided with an inversely tapered inclination corresponding to the inclination of the engaging surface of the engaging rib 4. When the container lid 2 is crowned on the container main body 1, both tapered engagement surfaces come into surface contact with each other, and based on this engagement relationship, stable stacking without backlash or misalignment between the container main body and the lid is possible. Realized.

  The structure of Patent Document 2 is attracting attention as a structure that enables stable stacking without looseness or misalignment between a lower object and an upper object in a foamed resin container. However, this structure also has drawbacks. In general, since the dimensional blur at the time of molding becomes large in the polystyrene foam product, the container lid 2 selected to be combined with one container body 1 may be unexpectedly small. In this case, when the relatively small container lid 2 is put on the relatively large container body 1, the side wall upper edge is bent near the center of the side wall of the container body in the direction approaching each other. It is possible to fit the engagement rib 4 of the container lid into the engagement recess 9 of the container lid. However, in the vicinity of the container corner portion where the side wall is hardly bent, the engagement rib 4 on the upper edge of the sidewall is engaged with the container lid. It does not fit into the recess 9 well. For this reason, the engagement rib 4 at the corner of the container body and the corner of the container lid interfere with each other, and the container lid 2 may not be completely covered with the container body 1.

Utility Model Registration No. 2593481 Japanese Utility Model Publication No. 57-23314

  An object of the present invention is to provide a box-type container capable of stably stacking a plurality of containers in the vertical direction even when the dimensional fluctuation of the containers is large. In particular, an object of the present invention is to provide a box-shaped container having a stacked structure suitable for a foamed resin container.

  The invention of claim 1 is a box-type container having a flat rectangular bottom wall and four side walls erected on the periphery thereof, and an engaging protrusion is formed at the upper end of the four side walls. The engaging protrusion at the upper end of the side wall has an engaging outer surface that is inclined so that the upper end is inclined to the inside of the container. Sometimes, an engaging ridge as a leg portion engageable with an engaging ridge at the upper end of the side wall of the container lower than the container is provided along the peripheral edge of the lower end of the container, and the engaging ridge as the leg portion. Has an engagement inner surface that is inclined so that the lower end of the engagement protrusion of the side wall upper end is inclined substantially corresponding to the inclination angle of the engagement outer surface, and at each corner portion of the container, The engagement protrusions at the upper end of the side wall are arranged so that the engagement outer surfaces of the engagement protrusions on the two adjacent side walls are discontinuously divided. Parts is a box-shaped container, characterized in that the set to outright-away shape toward the container interior.

  The invention according to claim 2 is a box-type container having a flat rectangular bottom wall and four side walls erected on the periphery thereof, and an engaging protrusion is provided at the upper end of the four side walls. The engaging protrusion at the upper end of the side wall has an engaging outer surface that is inclined so that the upper end is inclined to the inside of the container. Sometimes, an engaging ridge as a leg portion engageable with an engaging ridge at the upper end of the side wall of the container lower than the container is provided along the peripheral edge of the lower end of the container, and the engaging ridge as the leg portion. Has an engagement inner surface that is inclined so that the lower end of the engagement protrusion of the side wall upper end is inclined substantially corresponding to the inclination angle of the engagement outer surface, and at each corner portion of the container, As the leg portion, the engagement inner surface of the engagement protrusion along the two adjacent sides of the bottom wall is in a discontinuous divided state. A box-shaped container, characterized in that a portion of the engagement protrusion and outright-away shape toward the outside of the vessel.

  The box-shaped container according to claim 1 or 2, wherein the engagement protrusion at the upper end of the side wall has a square frame shape, and the engagement protrusion as the leg portion is an engagement protrusion at the upper end of the side wall. It is preferable to form a rectangular frame shape slightly larger than the strip (claim 3). Further, it is more preferable that the container is made of a foamed resin (claim 4).

[Action]
When a plurality of box-shaped containers of the present invention are stacked vertically, engagement as a leg portion provided on the lower surface of the bottom wall of the upper container with respect to an engagement protrusion provided on the upper end of the side wall of the lower container The protrusion is engaged, and at that time, the engaging outer surface of the engaging protrusion at the upper end of the side wall comes into surface contact with the engaging inner surface of the engaging protrusion as the leg portion. The engaging outer surface of the engaging ridge at the upper end of the side wall inclined so that the upper end is inclined to the inside of the container and the engaging inner surface of the engaging ridge as the leg portion inclined so that the lower end is inclined to the outside of the container are Since the inclination angles substantially correspond to each other, stable stacking without backlash and misalignment is realized between the lower and upper containers based on the guide relationship between the two inclined engagement surfaces that are in contact with each other.

  In particular, in claim 1, at each corner portion of the container, a part of the engaging protrusion on the upper end of the side wall is placed in the container so that the engaging outer surface of the engaging protrusion on the two adjacent side walls is discontinuously divided. Because the shape is cut out toward the inside, when stacking containers of standard dimensions, the engaging ridge (notch shape part) at the upper corner of the side wall of the lower container and the lower wall bottom corner of the upper container A clearance is ensured between the engaging ridges (engagement inner surface) as the leg portions. Therefore, even in the case of a combination in which there is a container with a large deviation from the standard dimension and the lower container is relatively large and the upper container is relatively small, the gaps present in the corner portion as described above are the dimensions between the containers. It functions as a displacement absorbing or buffering area, and mutual interference between the engaging ridge of the upper end corner portion of the side wall of the lower container and the engaging ridge of the lower surface corner portion of the bottom wall of the upper container is avoided. For this reason, even when the upper and lower containers with large dimensional blur are combined, the engaging ridges at the upper end of the side wall of the lower container are bent while the opposing side walls are bent in the direction approaching each other near the center of the side wall of the lower container. Can be completely engaged with the engaging ridges as the legs on the bottom side of the bottom wall of the upper container, and stable stacking without backlash and misalignment between the lower and upper containers is realized. Is done.

  In addition, as in claim 2, at each corner of the container, the engagement as a leg so that the engagement inner surface of the engagement ridge along the two adjacent sides of the bottom wall is discontinuously divided. Even in the case where a part of the ridge is cut out toward the outer side of the container, as in the case of claim 1, when containers of standard dimensions are stacked, the engagement of the upper corner of the side wall of the lower container is engaged. A gap is secured between the protrusion (engagement outer surface) and the engagement protrusion (notch-shaped portion) as the leg portion of the bottom wall lower surface corner portion of the upper container. Therefore, even in the configuration of claim 2, the operation as described in the preceding paragraph occurs, and stable stacking without backlash and misalignment between the lower and upper containers is realized.

  According to the box-shaped container of the present invention, by adopting the above-described configuration, it is possible to stably stack a plurality of containers in the vertical direction even when the dimensional blur of the containers is large. In particular, when the present invention is applied to a box-shaped container made of foamed resin, the advantages can be maximized.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The box-shaped container shown in FIGS. 1 to 7 has a flat rectangular bottom wall 2 and four side walls (a pair of short-side side walls 3 and a pair of side walls standing on the periphery (that is, four sides) of the bottom wall 2). And a long side wall 4), which is configured as a box-shaped container having an upper opening. In addition, this container is a foamed resin container integrally molded by bead method in-mold molding using a bead-shaped foamed resin (for example, foamed polypropylene) as a raw material.

  Each of the side walls 3 and 4 has a predetermined thickness (for example, about 15 to 25 mm), and has a horizontal container placement surface 5 and a protrusion projecting upward from the container placement surface 5 at each upper end. A joint ridge 6 is formed. In each side wall 3, 4, the engaging protrusion 6 is located closer to the inner surface side, and as a result, most of the container placement surface 5 is located closer to the outer surface side of the side walls 3, 4. The container placement surfaces 5 of these four side walls 3 and 4 are in the same plane, and function as surfaces for placing the upper container leg portions (engagement protrusions 8 as described later) when the containers are stacked.

  The engagement ridges 6 on the four side walls extend along the periphery of the upper end of the container and are integrally connected to the four side walls 3 and 4 so that they are interconnected at each corner portion of the container and form a square frame shape in plan view. Is formed. As shown in FIGS. 4 and 6, the inner side surface 61 of the rectangular frame-shaped engaging ridge 6 coincides with the inner surface of each side wall 3, 4 that hangs in the vertical direction. The outer surface 62 is configured as an engaging outer surface 62 that is inclined so that the upper end of the outer surface falls to the inside of the container. The engagement outer surface 62 is inclined at an inclination angle θ1 with respect to a horizontal plane (for example, the container placement surface 5). The upper end top surface 63 of the engagement protrusion 6 is a horizontal plane parallel to the container placement surface 5.

  As shown in FIG.1 and FIG.7, in each corner part of the container constructed | assembled by the adjacent short side wall 3 and the long side wall 4, a part (corner part) of square frame-shaped engagement protrusion 6 is shown. 6C) is formed in a concave shape by being cut out from the outside toward the inside of the container. That is, the outer surface of each corner portion 6C of the rectangular frame-shaped engaging protrusion 6 is formed so as to recede to the inside of the container with respect to the engaging outer surface 62 other than the corner portion 6C. The engaging outer surface 62 of the engaging ridge of the side wall 3 and the engaging outer surface 62 of the engaging ridge of the long side wall 4 are discontinuously divided.

  On the other hand, as shown in FIG. 2, on the lower surface side of the bottom wall 2 of the box-type container, an engaging groove for engaging the engaging protrusion 6 at the upper end of the side wall of the lower container when the containers are stacked. 7 is provided. The engagement groove 7 is provided over the entire periphery along the periphery of the bottom wall 2 and is formed in the bottom wall 2 so that the bottom view is a square frame shape. As a result, on the outermost periphery of the bottom wall 2 outside the engagement groove 7, an engagement protrusion 8 is created as a leg portion extending in a square frame shape along the periphery of the lower end of the container. ing. In addition, the square frame shape of the engagement protrusion 8 as a leg part is slightly larger than the square frame shape of the engagement protrusion 6 of the side wall upper end.

  As shown in FIGS. 4 and 6, the outer surface 81 of the engaging ridge 8 serving as the leg portion of the square frame shape coincides with the outer surface of each of the side walls 3 and 4 that are vertically suspended. The inner side surface 82 of the joint rib 8 is configured as an engaging inner surface 82 that is inclined so that the lower end of the inner side surface 82 falls down to the outside of the container. The engagement inner surface 82 is inclined at an inclination angle θ2 with respect to the horizontal plane. In addition, the lower end top surface 83 of the engaging protrusion 8 as a leg portion is a horizontal plane parallel to the container placement surface 5. Further, the bottom surface 71 of the engagement groove 7 opened on the lower surface side of the bottom wall 2 is also a horizontal plane.

  In this embodiment, the inclination angle θ2 of the engagement inner surface 82 of the engagement protrusion 8 as the leg portion is equal to the inclination angle θ1 of the engagement outer surface 62 of the engagement protrusion 6 at the upper end of the side wall (θ1 = θ2). . A preferable range of the inclination angles θ1 and θ2 is 30 ° to 60 °. Further, the height difference between the upper end surface 63 of the engaging ridge and the container mounting surface 5 at the upper end of the side wall (that is, the protruding height of the engaging ridge 6) is the bottom surface of the engaging groove 71 and the engaging ridge on the bottom surface of the bottom wall. It is substantially equal to the height difference from the lower end top surface 83 (that is, the protrusion height of the engaging protrusion 8 as the leg portion).

Next, the operation and effect of the box-shaped container of this embodiment will be described.
As shown in FIGS. 8 and 9, when two box-shaped containers of this embodiment are stacked vertically, the lower surface of the bottom wall of the upper container is engaged with the engaging protrusion 6 on the upper end of the side wall of the lower container. The protrusion (leg part) 8 is engaged with the engaging outer surface 62 of the engaging protrusion 6 in surface contact with the engaging inner surface 82 of the engaging protrusion 8. Since the inclination angle θ1 of the engagement outer surface 62 is equal to the inclination angle θ2 of the engagement inner surface 82, mutual positioning is performed between the lower and upper containers based on the guide relationship between the two inclined engagement surfaces 62 and 82 that are in contact with each other. And stable stacking without backlash or misalignment is achieved.

  In particular, in the present embodiment, at each corner portion of the box-shaped container, each corner portion 6C of the rectangular frame-shaped engaging protrusion 6 at the upper end of the side wall is cut out toward the inside of the container, whereby the short side wall The engaging outer surface 62 of the third engaging protrusion 6 and the engaging outer surface 62 of the engaging protrusion 6 of the long side wall 4 are discontinuously divided. Therefore, when containers having dimensions as specified are stacked, the engagement protrusion corner portion (notched portion) 6C of the upper end corner portion of the side wall of the lower container and the lower surface corner portion of the bottom wall of the upper container are related. A gap is ensured between the engaging inner surface 82 of the joint protrusion 8. The presence of such a corner gap produces the following advantages.

  Suppose that there is a box-shaped container having a large deviation from the standard size, and stacking is performed in a combination in which the lower container is relatively large and the upper container is relatively small. Even in such a case, the gap existing in the engaging protrusion corner portion as described above functions as an absorption or buffer region for the dimensional deviation between the containers. Mutual interference between the mating ridge 6 and the engagement ridge 8 at the lower corner of the bottom wall of the upper container can be avoided. For this reason, the side wall (for example, a pair of long side walls 4) facing each other in the vicinity of the center of the side wall of the lower container is bent in a direction approaching each other, and the engaging ridge 6 at the upper end of the lower container is moved to the bottom of the upper container. It is possible to completely engage with the engaging protrusion 8 on the wall lower surface side. Therefore, even when the upper and lower containers with large dimensional deviation are combined, stable stacking without backlash and misalignment between the lower and upper containers can be realized.

  As shown in FIG. 9, when the containers are ideally stacked, the lower end top surface 83 at the lower end of the upper container, the inner surface of the engagement with respect to the container placement surface 5, the engagement outer surface 62 and the upper end top surface 63 at the upper end of the lower container. 82 and the engagement groove bottom surface 71 are in surface contact with each other. In other words, by securing a wide load transmission area between the upper and lower containers, it is possible to reduce the load per unit area as much as possible and avoid load imbalance, so even if the container constituent material is foamed resin, Sufficient strength (or load resistance) can be maintained.

  [Modification]: In the above embodiment, each corner portion 6C of the rectangular frame-shaped engaging protrusion 6 at the upper end of the side wall is cut out toward the inside of the container. Instead of this configuration, as shown in FIG. 10, each corner portion 8 </ b> C of the square frame-shaped engaging protrusion 8 as the leg portion provided on the lower surface of the bottom wall 2 is cut out toward the outside of the container. By adopting the shape, the engagement inner surfaces 82 of the two engagement protrusions along two adjacent sides of the bottom wall 2 may be configured to be discontinuously divided. Also in this case, the same operational effects as those of the above embodiment can be obtained.

The top view of a box-shaped container. The bottom view of a box-type container. The front view of a box-shaped container. The partial expanded sectional view in the AA line of FIG. The right view of a box-shaped container. The partial expanded sectional view in the BB line of FIG. The partial perspective view seen from the arrow Q direction of FIG. The perspective view of the state which stacked two box-shaped containers. The partial expanded sectional view in the RR line | wire of FIG. The enlarged view of the box-shaped container bottom face corner part in the example of a change.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Bottom wall, 3 ... Short side wall, 4 ... Long side wall, 5 ... Container mounting surface, 6 ... Engagement ridge of side wall upper end, 62 ... Outer surface of engagement ridge 6 (engagement outer surface) ), 63... Upper end top surface of the engaging ridge 6, 6 C. Corner portion of the engaging ridge 6, 7. Engaging groove on the bottom wall, 8. Engaging ridge as a leg portion, 82. The inner side surface (engagement inner surface) of the strip 8, 83... The lower end top surface of the engagement projection 8, 8 C.

Claims (4)

A box-shaped container having a flat rectangular bottom wall and four side walls erected on the periphery thereof,
Engagement ridges are provided at the upper ends of the four side walls along the periphery of the upper end of the container. And
On the lower surface side of the bottom wall, there is an engaging ridge as a leg portion that can engage with the engaging ridge on the upper end of the side wall of the container lower than the container when the containers are stacked, along the peripheral edge of the lower end of the container. The engaging ridge as a leg portion of the engaging ridge is inclined so that the lower end of the engaging ridge is inclined to the outside of the container at an inclination angle substantially corresponding to the inclination angle of the engaging outer surface of the engaging ridge at the upper end of the side wall. Have
At each corner portion of the container, a part of the engagement protrusion at the upper end of the side wall is cut toward the inside of the container so that the engagement outer surface of the engagement protrusion on the two adjacent side walls is discontinuously divided. A box-type container characterized by a lacking shape. A box-shaped container having a flat rectangular bottom wall and four side walls standing on its periphery,
Engagement ridges are provided at the upper ends of the four side walls along the periphery of the upper end of the container. And
On the lower surface side of the bottom wall, an engaging ridge as a leg portion that can engage with the engaging ridge on the upper end of the side wall of the container lower than the container is stacked along the periphery of the lower end of the container. The engaging ridge as a leg of the engaging ridge is inclined such that the lower end of the engaging ridge is inclined to the outside of the container at an inclination angle substantially corresponding to the inclination angle of the engaging outer surface of the engaging ridge at the upper end of the side wall. Have
At each corner portion of the container, a part of the engaging ridge as the leg portion is placed in the container so that the engaging inner surface of the engaging ridge along the two adjacent sides of the bottom wall is discontinuously divided. A box-shaped container characterized by being cut out toward the outside.   The engagement protrusion at the upper end of the side wall has a square frame shape, and the engagement protrusion as the leg portion has a rectangular frame shape slightly larger than the engagement protrusion at the upper end of the side wall. The box-shaped container according to claim 1 or 2.   The box-shaped container according to claim 1, 2, or 3, wherein the container is made of a foamed resin.

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