JP2006096366A - Synthetic resin-made container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a synthetic resin-made container with high resistance against a load from the upper part working when stacked without a large change in weight or moldability. <P>SOLUTION: The synthetic resin-made container A is equipped with a bottom part 10, a sidewall part 20 standing from the bottom part, and supporting members 30a and 30b integrally molded on two opposite sidewalls 20a and 20b via a hinge 23. The support member 30 has a recessed part 34 formed which bites into a container body when the member 30 is closed toward the container body. The recessed part 34 is formed to be capable of receiving the bottom part 10 when the same container is stacked. Swells 42 and 43 which can entirely or partially support the bottom face 37 of the recessed part 34 from the underside are further formed on the sidewall 20 of the container body. Since the load from the upper side is supported on upper end surfaces 46 and 48 of the swells 42 and 43, deformation of the sidewall 20 can be alleviated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin container, and more particularly to a synthetic resin container in which deformation of the container can be avoided even when a heavy article is stored in the container in multiple stages and stored and distributed.

  For example, a synthetic resin container obtained by vacuum molding a polypropylene resin is known. In general, a synthetic resin container is widely used as a container for transporting and storing machine parts because it has good moldability, has a required strength, and can withstand repeated use. From the standpoint of space efficiency, etc., it must be strong enough to be stacked and stacked in the vertical direction (stacked state) even when it contains articles, and be used for transportation and storage. When the container is empty, It is desirable to be able to take a state (nesting state) in which a part is included.

  As a synthetic resin container that solves such a problem, Patent Document 1 discloses, as shown in FIG. 6, a bottom 51, a four-sided side wall 52 that rises from the bottom 51, and an upper end of the side wall 52 in the horizontal direction. The synthetic resin container 50 is provided with a flange 54 that extends in the vertical direction and a reinforcing rib 55 that runs in the vertical direction is formed on the side wall 52. In the container 50, the four side wall portions 52 are gradually expanded upward, and two opposing side walls integrally have support members 57, 57 via hinges 56, 56. In the state in which the article is not accommodated, the support member 57 is set in the posture opened to the outside indicated by the phantom line in the figure, so that a part of another container stacked in the container body is inserted (nesting) The storage space can be reduced.

  When stacking up and down in a multistage manner with the articles stored, the support member 57 is in a closed posture taken into the container as indicated by the solid line in the figure. A concave portion 58 is formed in the support member 57, and the bottom portion 51 of the container to be stacked thereon is inserted into the support member 57, thereby stabilizing the stacked posture. Further, the rib 55 formed on the side wall portion 52 prevents deformation and crushing.

JP 2000-203580 A

  The synthetic resin container shown in FIG. 6 can save space both during stacking and during nesting. Even if the articles are stacked in a state in which the articles are accommodated, the container main body is deformed even if it is heavy due to the presence of the rib 55 formed on the side wall portion 52 and the flange 54 formed on the upper end thereof. Can be prevented to some extent. However, in the case of this container, the load of the upper container that acts when stacked is mainly supported by the recessed portion 58 of the support member 57 in a closed position in the container. Since 58 is a form which is supported by the hinge 56 and whose side surface abuts against the side wall 52 of the container to maintain a stable posture, an outward moment is generated in the support member 57. Therefore, when the load increases, the moment toward the outside also increases, and when a load exceeding the design value acts on the recessed portion 58 of the support member 57, the side wall 52 of the container with which the side surface of the recessed portion 58 abuts is deformed. It becomes easy. Further, the bottom surface of the recessed portion 58 is easily deformed. As a result, since the balance of stacking is lost, the weight when stacking is naturally limited.

  Although it may be possible to prevent deformation by increasing the thickness of the side wall of the container or the support member, it is costly from the viewpoint of workability because of its heavy weight and the necessity of many materials for molding. Even so, it is not a realistic solution.

  The present invention was made in view of the circumstances as described above, and the strength against the load from above when stacked is greatly improved by slightly changing the shape of the container, and further improved. It is an object of the present invention to provide a synthetic resin container.

  A synthetic resin container according to the present invention is a synthetic resin container comprising a bottom part, four side wall parts rising from the bottom part, and a support member integrally formed on two opposing side walls via hinges. The member has a recessed portion that enters into the container body when the container is closed on the container body side, and the recessed portion is adapted to accommodate the bottom when the same synthetic resin container is stacked. And the bulging part which can support all or one part of the bottom face of the said recessed part from the downward direction is formed in the side wall part of a container main body, It is characterized by the above-mentioned.

  In the synthetic resin container described above, when stacking synthetic resin containers containing articles, the support member is taken into the container and is in a closed posture. At that time, the side surface of the recessed portion formed in the support member is backed up by the inner surface of the side wall portion, but in addition, all or part of the bottom surface of the recessed portion of the support member is formed by the bulging portion formed in the side wall portion. Supported from below. Therefore, a part of the load from the stacked synthetic resin containers is supported by the bulging portion, and the moment to spread outwardly acting on the support member is reduced accordingly. As a result, the deformation in which the side wall of the synthetic resin container positioned at the lower side tends to spread in the lateral direction is greatly suppressed as compared with a container that does not have such a bulging portion.

  In addition, since the load from the upper synthetic resin container is dispersed and supported over the entire area of the bulging portion that supports the bottom surface of the recessed portion of the supporting member from below, the thickness of the side wall portion or the supporting member is changed. Without increasing the area in which the bulging portion abuts against the bottom surface of the recessed portion, the larger load can be stably supported. As a result, even if the article storage space inside the container is sacrificed to that extent, the required container can be formed without increasing the weight of the container body and using many materials, from the viewpoint of workability. In addition, good results can be obtained in terms of cost.

  The support member may be of any size as long as the bottom of the upper synthetic resin container can be stably accommodated when stacking, and is large enough to partially cover the opening of the container. Still, the size may be such that the opening of the container body can be substantially closed. In the former case, there is a merit that the stored item can be recognized as it is during distribution or storage, and in the latter case, a function as a sealing lid can be provided.

  In a preferred embodiment, at least the first side wall formed on the side wall portion is formed on the side wall portion on the side not having the support member at the upper end with a first flange extending in the horizontal direction at both ends in the width direction of the support member. A second flange is formed that can ride on the flange. A second fitting portion is formed on the second flange, and the second fitting portion is fitted in a first flange region where the second flange of the supporting member in a closed posture abuts. A first fitting portion is formed. By forming the first and second flanges in this way, the deformation of the container body is more reliably suppressed. Furthermore, by forming the first and second fitting portions that are fitted to both flanges, the support member can be securely fastened to the container side wall portion, and the stacking operation is facilitated. There is also an effect that deformation is further suppressed.

  In a preferred embodiment, vertical ribs are integrally formed on the four side walls. Moreover, the partition material which can be attached so that the inside of a container main body may be divided using a reinforcement rib is provided. By doing so, it is possible to further prevent the container from being unnecessarily deformed during distribution or the like, and it is also possible to accommodate a plurality of types of articles in a single container. In another preferred embodiment, the four side wall portions are gradually expanded upward. By doing so, when the container is transported or stored in an empty state, a so-called nesting state can be obtained, and space saving can be achieved.

  In the present invention, the material synthetic resin for producing the container is not particularly limited, but a polypropylene resin is preferable from the viewpoint of strength and the like. However, other resins such as polystyrene resins, polyethylene resins, and polyethylene terephthalate resins can also be used. There is no particular limitation on the molding method, but the vacuum molding method is the most appropriate because of its ease of shape and ease of molding. However, other molding methods such as injection molding and thermoforming can also be used.

  ADVANTAGE OF THE INVENTION According to this invention, the synthetic resin container provided with high resistance with respect to the load from the top which acts when it piles up without adding a big change to weight or a moldability is obtained.

  Hereinafter, a synthetic resin container according to the present invention will be described based on embodiments with reference to the drawings. 1 is a perspective view showing the entire synthetic resin container when the support member is in an open position, and FIG. 2 is a perspective view showing the entire container shown in FIG. 1 when the support member is in a closed position. It is. 3 is a cross-sectional view taken along line III-III in FIG. 4 shows a state in which a large number of synthetic resin containers in the state shown in FIG. 2 are stacked in multiple stages, and FIG. 5 shows a state in which a large number of synthetic resin containers in the state shown in FIG. 1 are stacked. ing.

  In this example, the synthetic resin container A is a polypropylene resin vacuum-molded product, and includes a bottom portion 10 and four side wall portions 20 that are gradually expanded upward. The ribs 11 are integrally formed vertically and horizontally, and longitudinal ribs 21 are integrally formed on the side wall portion 20. A first flange 22 extending in the horizontal direction is formed at the upper end of the side wall portion 20. A supporting member 30a and a supporting member 30b having substantially the same shape are integrally formed at upper ends of the two opposing side wall portions 20a and 20b through a hinge 23 having a U-shaped cross section. Although not shown, flanges may be provided at the upper ends of the side wall 20a and the side wall 20b, and a hinge 23 having a U-shaped cross section may be provided at the end.

  Both side edges of the support members 30a and 30b are formed as flat second flanges 32, and the support members 30a and 30b are closed as shown in FIG. 2 (that is, the support members 30 are taken into the container body). The second flange 32 is placed on the first flange 22 formed on the container body side. The second flange 32 is formed with a second fitting portion 33 that protrudes to the back surface side (upper side in FIG. 1), and the first flange 22 has the support member 30a, 30b in the closed posture. The first fitting portion 24 into which the second fitting portion 33 is fitted is formed at a position where the second fitting portion 33 is opposed to the second fitting portion 33.

  Further, the support members 30a and 30b are formed with a recessed portion 34 that can enter the upper open portion of the container body. In this example, the lateral width of the recessed portion 34 is substantially the same as the lateral width of the upper open portion of the container body, and the central portion on the hinge 23 side is a rectangular non-recessed region 35.

  The two side wall portions 20a and 20b facing each other where the support members 30a and 30b are provided are respectively formed with bulging portions 40 directed toward the inner side (article housing portion) of the container also for reinforcement. . The bulging portion 40 of one side wall portion 20a is formed by a central bulging portion 41 and left and right bulging portions 42a and 42b, and the bulging portion 40 of the other side wall portion 20b is formed by a central bulging portion 43. It is formed with. The central bulging portion 41 on the side of the side wall portion 20a is large enough to enter the rectangular non-recessed region 35 of the support member 30a, and the level of the upper end surface 45 is the same as that of the first flange 22. ing. In addition, the levels of the upper end surfaces 46a and 46b of the left and right bulged portions 42a and 42b are levels that are lowered from the surface of the first flange 22 by substantially the same distance as the depth of the recessed portion 34 of the support member 30.

  Accordingly, when the support member 30a is moved from the open position shown in FIG. 1 to the closed position shown in FIG. 2, the non-recessed region 35 of the support member 30a comes into contact with the upper end surface 45 of the central bulging portion 41. . In addition, as shown in FIG. 3, the left and right end neighborhoods 36, 36 on the hinge 23 side of the recessed portion 34 are in contact with the upper end surfaces 46a, 46b of the left and right bulged portions 42a, 42b. In addition, the side walls 38 and 38 are in contact with the side wall portion 20a.

  Further, the level of the upper end surface 47 of the bulging portion 43 on the side wall 20b side is set to the same level as that of the first flange 22, and left and right portions are formed with lower end portions. The level of the upper end surfaces 48a and 48b of the formed portions is the same as the depth of the recessed portion 34 of the support member 30 by the same distance as the level of the upper end surfaces 46a and 46b of the left and right bulged portions 42a and 42b. The level is lowered from the surface of the first flange 22.

  Therefore, when the support member 30b is moved from the open position shown in FIG. 1 to the closed position shown in FIG. 2, the non-recessed region 35 of the support member 30b is formed at the center of the bulging portion 43, as in the case of the support member 30a. The state is in contact with the upper end surface 47. And the bottom surfaces 37, 37 of the left and right sides 36, 36 of the non-recessed region 35 in the recessed portion 34 of the support member 30 are in contact with the left and right upper end surfaces 48a, 48b of the bulged portion 43, In addition, the side wall comes into contact with the side wall portion 20b.

  As described above, after the mechanical member or the like is accommodated in the synthetic resin container A with the support member 30 shown in FIG. 1 in the open position, the support member 30 is rotated through the hinge 23 and closed. Then, as shown in FIGS. 2 and 3, the recessed portion 34 of the support member 30 enters the container main body, and the first flange 22 and the second flange 32 overlap each other, so that the first And the second fitting portions 24 and 33 are fitted to each other and the lid is closed. The recessed portion 34 of the support member 30 has a shape and size that allows the bottom 10 of the same container A to enter, and the synthetic resin container A with a lid is shown in FIG. 4 during distribution or storage. Are placed in a multi-tiered state.

  In this state, the load of the upper synthetic resin container A acts on the recessed portion 34 of the support member 30 of the lower synthetic resin container A. The concave portion 34 is supported from below by the upper end surfaces 46 and 48 of the bulging portion 42 formed on the side wall portion 20 at the bottom portion 37 as described above, and the support member 30 is moved outward by that amount. The force (moment) to push open is reduced. As a result, the force with which the side surface 37 of the recessed portion 34 presses the side wall portions 20a and 20b of the container body toward the outside is reduced, and deformation of the container is suppressed. The deformation of the container side wall portion 20 is also suppressed because the first flange 22 and the second flange 32 are fitted and locked by the first and second fitting portions 24 and 33.

  After the fitting of the first and second fitting portions 24 and 33 is released, the support member 30 is opened, and the accommodated article is taken out, the empty container is stored and returned. In this case, as shown in FIG. 5, the upper container can be stacked (nested) in a state where a part of the upper container is inserted into the article storage space of the lower container, so that useless space can be eliminated. .

  In the above description, a part of the upper end surface (46, 48) of the bulging part 40 formed on the side wall part 20 is shown as a part for supporting a part of the bottom part of the recessed part 34 of the support member 30 from below. This is an example, and in the container shown in FIG. 1, for example, the side wall so that all (or a part) of both side edges of the recess 34 and all side edges close to the hinge 23 can be supported from below. You may make it form a bulging part over the wide area | region of the inner surface of a part. By doing so (even if the article accommodation space is sacrificed to some extent), the load applied to the recessed portion 34 is shared and supported in a wider area, and the deformation of the side wall portion of the container is more reliably performed. Can be suppressed. Further, the support member 30 itself is hardly deformed.

The perspective view which shows the whole synthetic resin container when the support member exists in the open attitude | position. The perspective view which shows the whole container shown in FIG. 1 when it exists in the attitude | position which closed the support member. Sectional drawing in the III-III line of FIG. The figure which shows the state which piled up the synthetic resin containers in the state shown in FIG. 2 in multiple stages. The figure which shows the state which accumulated the synthetic resin containers in the state shown in FIG. Sectional drawing which shows an example of the conventional synthetic resin containers.

Explanation of symbols

  A ... synthetic resin container, 10 ... bottom part, 20, 20a, 20b ... side wall part, 11, 21 ... reinforcing rib, 22 ... first flange, 23 ... hinge, 30 (30a, 30b) ... support member, 32 ... 2nd flange, 24 ... 1st fitting part, 33 ... 2nd fitting part, 34 ... Recessed part, 35 ... Non-recessed area | region, 40, 41, 42, 43 ... Swelling part, 45, 46, 47, 48 ... upper end surface of the bulging portion, 36 ... near the left and right ends of the recessed portion on the hinge side, 37 ... bottom surface of the recessed portion, 38 ... side wall of the recessed portion

Claims (5)

A synthetic resin container comprising a bottom part, four circumferential side walls rising from the bottom part, and a support member integrally formed on two opposing side walls via a hinge,
The support member has a recessed portion that enters the container body when the support member is closed on the container body side, and the recessed portion can receive the bottom when the same synthetic resin container is stacked. And a bulging portion capable of supporting all or part of the bottom surface of the recessed portion from below is formed on the side wall portion of the container body.   At least the side wall portion on the side having no support member has a first flange extending in the horizontal direction at the upper end, and the support member rides on the first flange formed on the side wall portion at both edges in the width direction. A first flange region in which the second flange of the supporting member in a closed posture is in contact with the second flange. The synthetic resin container according to claim 1, wherein a first fitting portion into which the second fitting portion is fitted is formed.   The synthetic resin container according to claim 1 or 2, wherein vertical reinforcing ribs are integrally formed on the four side walls.   The synthetic resin container according to claim 3, further comprising a partition member that can be attached so as to partition the inside of the container body using a reinforcing rib.   The synthetic resin container according to claim 1, wherein the side wall portions of the four circumferences are gradually expanded upward.

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