Packaging container lids

Abstract

To provide a lid capable of sealing a packaging container and easily removing it from the packaging container by folding up a corner part, so that even if the corner part of the lid is folded up, the corner part returns to its original state and can be sealed again if the hand is released afterwards, and to seal the inner container of a packaging container provided with a plurality of protrusions, so that a plurality of packaging containers can be stacked while the lid is on.SOLUTION: A lid for a packaging container according to the invention has a peripheral edge 10 covering the upper edge of the packaging container, a descending wall 11, a side part 12, a top part 13 and an extended peripheral edge 15 formed at the four corners, wherein the extended peripheral edge 15 has an arc-shaped side 14, a convex part 16 capable of accommodating a projection of the inner container, two protruding strip parts 17, 18 and a flat surface 19, and an extension line extending the arc-shaped side 14 intersects the two protruding strip parts 17, 18.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a lid that covers the top of a packaging container used primarily for storing food such as rice bowls, pasta, and various side dishes, as well as various other items. [Background technology]

[0002] Lids for such packaging containers are widely used that are made of thin, integrally molded plastic, and Patent Document 1 (Japanese Utility Model Publication No. 57-2310) and Patent Document 2 (Japanese Utility Model Publication No. 4-128254) disclose that in a lid having a peripheral portion that fits over the edge of a container, by providing a gripping piece or an extension at the corner and forming a thin, linear hinge portion or a recessed portion, etc., it becomes easier to fold up the corners of the lid and to remove the lid (see in particular Figures 1 and 3, pages 1, right column, lines 25-35, and pages 2, left column, lines 5-11 of Patent Document 1, and Figure 1 and paragraphs 0007-0010 of Patent Document 2). The applicant has also developed a food packaging container that can be assembled by dropping an inner container made of a thin plastic material with a recess for storing food into the top of an unfolded frame and engaging the outer edge of the inner container with the upper end of the frame. As described in Patent Document 3 (Utility Model Registration No. 3200776), the applicant has proposed a design in which an outer edge and multiple protrusions are provided on the upper edge of the inner container to make it easier to stack food packaging containers one above the other, and a design in which a flat lid, which has the same shape as the top surface of the inner container, is provided on its underside in a recess capable of accommodating multiple protrusions, so as to prevent the lid from slipping off when it covers the top of the inner container (see especially the abstract).

[0003] However, although the lids of the packaging containers disclosed in Patent Documents 1 and 2 have corners that can be easily folded up and removed from the container, there is a problem in that once a corner of the lid is folded up, it is difficult to return the corner to its original state.In addition, the packaging container disclosed in Patent Document 1 has insertion holes recessed into the corners of the periphery of the container, which causes a problem in that the inside of the container cannot be sealed. Furthermore, since the lid in Patent Document 3 is flat, it is not possible to seal the inner container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Publication No. 57-2310 (Japanese Utility Model Publication No. 51-10101) [Patent Document 2] Japanese Utility Model Application Publication No. 4-128254 [Patent Document 3] Utility Model Registration No. 3200776 Summary of the Invention [Problem to be solved by the invention]

[0005] The first objective of the present invention is to solve the above problems and provide a lid that can seal a packaging container and can be easily removed from the packaging container by folding up a corner, such that even if the corner of the lid is folded up, the corner returns to its original state when the lid is then released, allowing the packaging container to be resealed. A second objective of the present invention is to be able to seal an inner container having an outer edge and multiple protrusions on the upper edge as described in Patent Document 3, and to enable multiple packaging containers to be stacked with the lids still on. [Means for solving the problem]

[0006] The lid of the packaging container according to the invention of claim 1 is A lid for covering a packaging container having a polygonal upper surface, The peripheral portion of the lid has a peripheral edge portion formed so as to cover the upper edge of the packaging container, and a descending wall portion formed inside the peripheral edge portion, a peripheral portion formed at least at one corner of the lid is an expanded peripheral portion that widens toward the center and has an arc-shaped or linear side connecting both sides on the inside, Near the both sides of the enlarged peripheral portion, along the portion covering the upper edge, It is formed like a gutter. A convex portion is provided, An extension line of the arc-shaped or straight side intersects with the protruding portion. And, When the corner of the enlarged peripheral portion is lifted upward, the enlarged peripheral portion is bent along the lower end of the descending wall portion below the arcuate or straight side, and then the lifting upward is stopped, the enlarged peripheral portion returns to the state before it was bent. It is characterized by:

[0007] The lid of the packaging container of the invention according to claim 2 is The lid for the packaging container according to claim 1, The outer edge of the enlarged peripheral portion is characterized by having a finger hook portion that protrudes outward, downward or upward from the upper edge when the lid is covering the packaging container.

[0008] The lid of the packaging container of the invention according to claim 3 is The lid for the packaging container according to claim 1 or 2, The packaging container comprises an inner container and a frame material, The upper edge of the inner container is provided with an outer edge portion that extends outward and abuts against the upper end of the frame material, A protrusion protruding upward is provided on the inside of the corner of the upper edge portion. 、 The enlarged peripheral portion is formed at a corner of the lid, the upper surface of the enlarged peripheral portion is provided with a convex portion and a flat surface capable of accommodating the protrusion, When stacking multiple containers, avoid contact with other packaging containers. The frame material is characterized in that it can be placed on the flat surface. Effect of the Invention

[0009] The lid of the packaging container of the invention according to claim 1 has an arcuate or straight edge connecting both sides on the inside of an enlarged peripheral portion formed at at least one corner, and when a corner of the enlarged peripheral portion is lifted upward, the enlarged peripheral portion bends along the lower end of the descending wall portion below the arcuate or straight edge, so that the bent enlarged peripheral portion can be grasped and the lid can be easily removed. In addition, near both sides of the expanded peripheral portion, along the portion covering the upper edge of the packaging container, It is formed like a gutter.Since the convex rib is provided and an extension line of the arcuate or straight side intersects with the convex rib, when the enlarged peripheral portion bends along the lower end of the descending wall portion below the arcuate or straight side, the convex rib also bends at the portion where it intersects with the extension line. However, since the convex rib is formed in a gutter shape, even if a corner of the enlarged peripheral portion is lifted upward and the corner of the lid is folded up, the enlarged peripheral portion returns to its original state when the hand is released. Therefore, even if the corner of the lid is folded up, the corner returns to its original state after the lid is subsequently released or the lid is removed from the packaging container, making it possible to reseal the packaging container.

[0010] According to the invention of claim 2, in addition to the effect provided by the lid of the invention of claim 1, the outer edge of the enlarged peripheral portion is provided with a finger grip portion that protrudes to the outside, lower or upper side of the upper edge when the lid is placed over the packaging container, making it easier to lift the corner of the enlarged peripheral portion upward.

[0011] According to the invention of claim 3, in addition to the effect of the lid of the invention of claim 1 or 2, the packaging container comprises an inner container and a frame, the upper edge of the inner container is provided with an outer edge that extends outward and abuts against the upper end of the frame, a protrusion that protrudes upward is provided on the inside of the corner of the upper edge, and a convex portion and a flat surface that can accommodate the protrusion are provided on the upper surface of the expanded peripheral portion, When stacking multiple containers, avoid contact with other packaging containers. Since the frame material can be placed on a flat surface, an inner container having an outer edge and multiple protrusions on its upper edge can be sealed simply by covering it with the lid of the invention according to claim 3, and multiple packaging containers can be stacked with the lid on. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view of a lid of a packaging container according to an embodiment. [Diagram 2] FIG. 1 is a perspective view of a packaging container according to an embodiment. [Diagram 3] FIG. 4 is a plan view of a corner portion of a lid of a packaging container according to an embodiment. [Figure 4] FIG. 2 is a perspective view of a corner portion of a lid of a packaging container according to an embodiment. [Diagram 5] FIG. 5 is a perspective view of the corner portion of FIG. 4 folded up. [Figure 6] 10A to 10C are plan views of corner portions of lids of packaging containers according to various modified examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present invention will be described with reference to examples. EXAMPLES

[0014] Fig. 1 is a perspective view of a lid 1 of a packaging container according to an embodiment, and Fig. 2 is a perspective view of a packaging container 2 according to an embodiment. Also, Fig. 3 and Fig. 4 are a plan view and a perspective view, respectively, of a corner portion 5 of the lid 1 of the packaging container according to the embodiment. The lid 1 of the packaging container according to the embodiment is made of a transparent thin plastic material as shown in FIG. 1, and can close the top of the packaging container 2 shown in FIG. The packaging container 2 is composed of a foldable frame material 3 that is rectangular when opened, and an inner container 4 made of thin plastic and molded as a single unit. As shown in Figure 2, it is assembled by dropping the inner container 4 into the rectangular frame material 3 from above and covering the upper end of the frame material 3 with the outer edge 5 provided on the upper edge of the inner container 4.

[0015] The frame material 3 is made of four foamed plastic plates connected in a ring shape. When open, it is rectangular as shown in Figure 2, and when closed, the opposing inner faces are in close contact with each other, making it possible to stack two foamed plastic plates on top of each other. Furthermore, a groove (not shown) is provided along the upper end of the inner side of the frame material 3.

[0016] The inner container 4 has a large storage recess 6 and a small storage recess 7 . The outer edge 5 of the inner container 4 spreads outward and bends downward, and the upper end of the frame 3 fits between the upper part of the side wall of the inner container 4 and the outer edge 5. In addition, a protrusion 8 is provided along the upper edge on the outside of the upper part of the inner container 4, which engages with a groove provided on the inside of the frame 3. Therefore, after the packaging container 2 is assembled, the frame 3 and the inner container 4 are difficult to separate. Furthermore, an upwardly protruding protrusion 9 is provided on the inside of the corners of the upper edge of the inner container 4, so that when the packaging containers 2 are stacked, the lower end surface of the upper frame material 3 is placed on the upper surface of the lower outer edge 5, and the four protrusions 9 are located on the inside of the four corners of the upper frame material 3, thereby preventing the upper and lower packaging containers 2 from shifting out of place.

[0017] Next, the lid 1 for the packaging container will be described in detail. The lid 1 has a peripheral portion 10 capable of covering the upper edge of the packaging container 2 and a descending wall portion 11 formed on the inside of the peripheral portion 10 so as to cover the entire upper part of the packaging container 2 and thereby seal the inside of the inner container 4, and the central portion of the lid 1 has a side portion 12 and an upper portion 13 capable of covering the upper surface of the packaging container 2. Further, at the four corners of the lid 1, an enlarged peripheral portion 15 is formed which widens toward the center and has an arc-shaped side 14 on the inside connecting both side portions. Furthermore, as shown in Figures 3 and 4, a convex portion 16 capable of accommodating protrusion 9 is provided in the center of expanded peripheral portion 15, two convex strip portions 17, 18 are provided near both sides of expanded peripheral portion 15 along the portion covering the upper edge of packaging container 2, and a flat surface 19 having a height greater than that of the two convex strip portions 17, 18 is provided on the outer periphery of convex portion 16, on which the lower end face of frame material 3 can be placed, and the outer edge of expanded peripheral portion 15 protrudes outward from the upper edge when lid 1 covers packaging container 2, and has fine unevenness (knurling) on ​​both the top and bottom surfaces. An extension line of the arc-shaped side 14 intersects with two protruding portions 17 and 18 .

[0018] Since the enlarged peripheral portion 15 is configured as described above, when the lid 1 is placed over the top surface of the packaging container 2, the projections 9 are accommodated in the protrusions 16, and the upper edge of the packaging container 2 is covered by the peripheral portion 10 and the outer edge of the enlarged peripheral portion 15, while the descending wall portion 11 is pressed into the inner side wall of the inner container 4. Therefore, the inside of the inner container 4 can be sealed by the lid 1. In addition, since the outer edge of the enlarged peripheral portion 15 protrudes outward from the upper edge, it functions as a finger hook on which the user can hook his / her fingers, and further, since the outer edge is knurled, it is possible to prevent the user from cutting their fingertips when they hook their fingers. Then, when a corner of the enlarged peripheral portion 15 is lifted upward, as shown in FIG. 5, the enlarged peripheral portion 15 bends along the lower end of the descending wall portion 11 below the arcuate side 14, so that the corner of the folded-up lid 1 can be grasped and the lid 1 can be easily removed from the packaging container 2.

[0019] Incidentally, when a corner of enlarged peripheral portion 15 is lifted upward, enlarged peripheral portion 15 bends along the lower end of descending wall portion 11 below arc-shaped side 14, and the two convex ribs 17, 18 also bend in the middle. However, since the two gutter-shaped convex ribs 17, 18 attempt to return to their original shape, even if a corner of lid 1 is folded up, when you then release your hands, enlarged peripheral portion 15 will return to its original state (the state shown in Figure 4), and since the bent portion becomes arc-shaped and gutter-shaped after returning, the original shape will be maintained. In other words, after folding up or removing the lid 1, if one releases his / her hand from the corner of the lid 1, the enlarged peripheral portion 15 returns to its original state, and the original shape is maintained even after the corner of the lid 1 has been folded up once, so that the inside of the inner container 4 can be easily resealed using the lid 1. In addition, flat surfaces 19 are provided on the outer periphery of the convex portions 16, on which the lower end surfaces of the frame material 3 can be placed. By placing the lower end surfaces of the four corners of the frame material 3 on the four flat surfaces 19, multiple packaging containers 2 can be stacked with their lids 1 attached. When stacked, the convex portions 16 of the lower lid 1 are positioned inside the four corners of the upper frame material 3, thereby preventing the upper and lower packaging containers 2 from shifting.

[0020] Modifications of the embodiment are listed below. (1) In the embodiment, the packaging container 2 is a rectangular parallelepiped, but the shape is not limited to a rectangular parallelepiped and the upper surface may be polygonal. (2) The packaging container 2 in the embodiment is assembled by covering the upper end of the frame material 3 with the outer edge 5 of the inner container 4, but it does not have to be an assembled type, and it does not have to have a frame material 3. (3) The inner container 4 in the embodiment is made of thin plastic and produced by one-piece molding, but it is not limited to plastic and may be made of paper. (4) The inner container 4 in the embodiment has a large storage recess 6 and a small storage recess 7, but the size and arrangement of the storage recesses are not limited to this example and can be selected appropriately. (5) In the embodiment, the outer edge 5 of the inner container 4 spreads outward and bends downward, but it does not have to be bent downward. As long as it can abut against the upper end of the frame material 3 to prevent the inner container 4 from falling inside the frame material 3, the outer edge 5 may have any structure. (6) In the embodiment, the inner container 4 is provided with the ridges 8 and the frame material 3 is provided with the grooves, but these may not be provided. (7) In the embodiment, the protrusions 9 are provided on the inside of the four corners of the inner container 4, but the protrusions 9 may be provided at two locations located diagonally. In cases where stacking is not required or where a frame material 3 is not used, the protrusions 9 do not need to be provided.

[0021] (8) The lid 1 in the embodiment is made of a transparent thin plastic and has a side surface 12 and a top surface 13 in the center, but it does not have to be transparent and any material can be used as long as it is flexible enough to bend in a molded state and return to its original shape. Also, the structure of the center can be any structure as long as it can cover the top surface of the packaging container 2. (9) In the embodiment, the lid 1 has enlarged peripheral portions 15 formed at all four corners. However, if there is no need to stack the packaging containers 2 with the lid in place, it may be formed at only one corner. It is sufficient that the enlarged peripheral portion 15 is formed at at least one corner. (10) In the embodiment, the enlarged peripheral portion 15 is provided with an arc-shaped edge 14 and a convex portion 16 capable of accommodating the protrusion 9. However, since the two convex rib portions 17, 18 have the function of maintaining the original shape, the arc-shaped edge 14 may be replaced with a straight edge 14' as shown in FIG. 6(1). In addition, in the case of the expanded peripheral portion 15 formed at a corner portion where no protrusion 9 is provided, as in the above-mentioned modified example (7), the expanded peripheral portion 15' may be one where no convex portion 16 is provided, as shown in Figures 6 (2) and (3). Furthermore, as in the above-mentioned variant example (9), if there is no need to stack the packaging containers 2 with the lids closed, the enlarged peripheral portion may be the enlarged peripheral portion 15' shown in Figure 6 (2) or (3) without the flat portion 19. (11) In the embodiment, the outer edge of the enlarged peripheral portion 15 has a finger hook portion that protrudes outward from the upper edge when the lid 1 covers the packaging container 2, but the finger hook portion may protrude below or above the outer edge portion 5, or a finger hook portion may not be provided. When the finger hook portion is protruded above or below the outer edge portion 5, it is necessary to ensure that the extension line of the arc-shaped side 14 does not overlap with the point where the two protruding portions 17, 18 intersect. (12) In the embodiment, the outer edge of the enlarged peripheral portion 15 is knurled, but the knurling may be applied to the entire peripheral portion 10 of the lid 1, or may not be applied at all. [Explanation of symbols]

[0022] 1 Lid 2 Packaging container 3 Frame material 4 Inner container 5 outer edge 6 large storage recess 7 small storage recess 8 ridge 9 projection 10 peripheral portion 11 descending wall portion 12 side portion 13 top portion 14 arcuate edge 15 enlarged peripheral portion 16 Convex portion 17, 18 Convex strip portion 19 Flat surface

Claims

1. A lid for covering a packaging container having a polygonal upper surface, The peripheral portion of the lid has a peripheral edge portion formed so as to cover the upper edge of the packaging container, and a descending wall portion formed inside the peripheral edge portion, a peripheral portion formed at least at one corner of the lid is an expanded peripheral portion that widens toward the center and has an arc-shaped or linear side connecting both sides on the inside, a gutter-shaped protruding portion is provided near each of the two side portions of the enlarged peripheral portion and along a portion covering the upper edge, an extension line of the arc-shaped or linear side intersects with the protruding strip portion, When the corner of the enlarged peripheral portion is lifted upward and the enlarged peripheral portion is bent along the lower end of the descending wall portion below the arcuate or straight side, the enlarged peripheral portion returns to its original state before being bent when the lifting upward is stopped. A lid for a packaging container.

2. The outer edge of the enlarged peripheral portion is provided with a finger hook portion that protrudes outwardly, downwardly, or upwardly from the upper edge when the lid is placed over the packaging container.

2. The lid for a packaging container according to claim 1.

3. The packaging container comprises an inner container and a frame material, The upper edge of the inner container is provided with an outer edge portion that extends outward and abuts against the upper end of the frame material, A protrusion protruding upward is provided on the inside of the corner of the upper edge portion, The enlarged peripheral portion is formed at a corner of the lid, the upper surface of the enlarged peripheral portion is provided with a convex portion and a flat surface capable of accommodating the protrusion, When stacking multiple containers, the frames of other packaging containers can be placed on the flat surface.

3. A lid for a packaging container according to claim 1 or 2.

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