JP2022142895A - Lid body made of synthetic resin - Google Patents

Abstract

To provide a lid body made of synthetic resin which can confirm a fitting failure from the noise, feeling and the like at the time of fitting, when it is fitted in a container body, and which can prevent an opening of the container body being distorted.SOLUTION: A lid body 100 made of synthetic resin includes: a top plate 110; side parts (130, 140) extending downward from an outer periphery 111 of the top plate 110; and corner parts 150. At side parts (130, 140) adjacent to both sides sandwiching the corner part 150, protrusion ribs (134, 144) protruding inwardly are formed respectively. The protrusion ribs (134, 144) are separated from each other sandwiching the corner part 150, and they are arranged at the same height or at different heights in the vertical direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a synthetic resin lid.

2. Description of the Related Art Conventionally, a synthetic resin container body for storing foods such as side dishes and cooked rice and a synthetic resin lid that can be fitted to the container body have been used in supermarkets, convenience stores, and the like.

In addition, in view of recent environmental problems, the use of paper container bodies instead of synthetic resin container bodies has been studied in order to eliminate plastics and reduce plastic consumption. For example, as shown in Non-Patent Document 1, there is known a container body made of paper having a wall surface extending upward. A lid made of synthetic resin, as shown in Non-Patent Document 1 and Patent Document 1, is generally placed on the paper container main body, and furthermore, the lid is prevented from coming off carelessly. In addition, a tape or the like is also used to fasten the lid and the container body together.

However, when a synthetic resin lid is mounted on a paper container body as in the past, it is more difficult to fit than when a synthetic resin lid is fitted to a synthetic resin container body. There is a problem that the resistance when fitting is small, and it is difficult to confirm failure of fitting from the sound and feel of fitting. On the other hand, in the lid made of synthetic resin as shown in Patent Document 2, projections are formed along the entire circumference of the inside of the lid so as to mesh with the container body made of paper, so the resistance during fitting is large. It's becoming However, there is a problem that the opening of the paper-made container main body is distorted because the projections are engaged with the entire opening of the paper-made container main body.

Japanese Patent Laid-Open No. 60-172643 Japanese Utility Model Laid-Open Showa 50-47801

Orikane Co., Ltd. "weeco vol.2" electronic catalog (published November 4, 2020) "Taper box 11-11 unbleached"

Therefore, in view of the above problems, the present invention makes it easy to check the fitting failure from the sound and feel at the time of fitting when it is fitted to the container body, and can prevent the opening of the container body from being distorted. To provide a cover made of synthetic resin.

In order to solve the above problems, a synthetic resin lid according to claim 1 of the present invention is a synthetic resin lid having a top surface, side portions extending downward from the outer periphery of the top surface, and corners. wherein the side portions adjacent to each other on both sides of the corner portion are formed with convex ribs projecting inward, respectively, and the convex ribs are mutually adjacent to each other across the corner portion. They are spaced apart and arranged at the same height or different heights in the vertical direction.

According to the above feature, by engaging both sides of the corners of the container body so as to be sandwiched between the convex ribs on both sides of the lid body, the feel of fitting is strongly transmitted, and the sound of fitting is also recognizable. It is easy to check the fitting failure from the sound and feel at the time of fitting. Furthermore, since the convex ribs on both sides of the lid are spaced apart from each other across the corners, the lid is fitted to the container body without coming into contact with the corners of the container body corresponding to the corners of the lid. Even if they are aligned, it is possible to prevent the shape of the opening of the container body from being distorted.

Further, the synthetic resin lid according to claim 2 of the present invention is characterized in that the convex rib is provided near the corner on the side portion.

According to the above feature, in the portion of the side portion where the convex rib is not provided, it is easy to seal the lid and the container body with tape, side shrink, or the like.

Further, in the synthetic resin lid body according to claim 3 of the present invention, at least two or more of the convex ribs are provided in the vertical direction on the side portion where the convex ribs are provided. Characterized by

According to the above feature, the vertically arranged convex ribs engage with the wall surface of the container body over a wider area, so that the fitting between the lid body and the container body becomes stronger.

Further, according to a fourth aspect of the present invention, there is provided a lid made of synthetic resin, wherein the side portion has a shape that bulges outward in a plan view.

According to the above feature, when fitting, the wall surface of the container body can easily maintain a curved shape that swells outward. Engagement can be maintained strongly.

When the lid body made of synthetic resin of the present invention is fitted to the container body, it is easy to confirm the failure of the fitting from the sound and feel of fitting, and it is possible to prevent the opening of the container body from being distorted.

(a) is a plan view of a lid according to Embodiment 1 of the present invention, and (b) is an enlarged perspective view of a periphery of a corner of the lid. (a) is a front view of the lid, (b) is an AA end view of FIG. 1(a), and (c) is a BB end view of FIG. 1(a). (a) is a plan view of the container body, (b) is a front view of the container body, and (c) is a CC end view. (a) is a plan view of a packaging container, and (b) is an enlarged perspective view of the vicinity of a corner of the packaging container. (a) is a front view of the packaging container, (b) is a DD end view of FIG. 4 (a), (c) is an EE end view of FIG. 4 (a), (d) is 4(b) is an end view FF of FIG. 4(a); FIG. (a) is a plan view of a lid according to Embodiment 2 of the present invention, and (b) is an enlarged perspective view of a periphery of a corner of the lid. (a) is a front view of the lid, and (b) is a side view of the lid. (a) is a GG end view of FIG. 6(a), and (b) is a HH end view of FIG. 6(a). (a) is a plan view of the container body, (b) is a front view of the container body, and (c) is a side view of the container body. (a) is an end view taken along II in FIG. 9(a), and (b) is an end view taken along JJ in FIG. 9(a). (a) is a plan view of a packaging container, and (b) is an enlarged perspective view of the vicinity of a corner of the packaging container. (a) is a front view of a packaging container, and (b) is a side view of the packaging container. (a) is a KK end view of FIG. 11(a), and (b) is a LL end view of FIG. 11(a).

110 top surface 111 outer periphery 130 side portion 134 convex rib 140 side portion 144 convex rib 150 corner portion

Each embodiment of the present invention will be described below with reference to the drawings. In this specification, the term “upper” means the upward direction in the vertical direction when the lid made of synthetic resin is placed on a horizontal surface with the opening face down. "Lateral" means the downward direction in the vertical direction, and "lateral" means the direction in the horizontal direction.

<Embodiment 1>
First, FIGS. 1 and 2 show a lid body 100 according to Embodiment 1 of the present invention. 1(a) is a plan view of the lid 100, FIG. 1(b) is an enlarged perspective view of the periphery of the corner of the lid 100, FIG. 2(a) is a front view of the lid 100, 2(b) is an AA end view of FIG. 1(a), and FIG. 2(c) is a BB end view of FIG. 1(a).

As shown in FIGS. 1 and 2, the lid 100 has a shallow dish shape with a downward opening, and includes a flat top surface 110 that is substantially rectangular in plan view and an outer periphery 111 of the top surface 110 that extends obliquely downward from one side. A side portion 130 extending toward the top surface 110 and a side portion 140 extending obliquely downward from the other side of the outer periphery 111 of the top surface 110 are provided. The side portion 130 on one side and the side portion 140 on the other side are connected to each other with a corner portion 150 interposed therebetween. Moreover, as shown in FIG. 1A, each of the side portion 130 on one side and the side portion 140 on the other side has a curved shape that bulges outward in a plan view. Further, a misalignment prevention portion 121 is provided at a corner of the outer periphery 111 of the top surface 110 so as to protrude upward from the surface of the top surface 110, and when the container bodies 200 described later are stacked, the upper part of the stacked container body 200 can be The container main body 200 is prevented from laterally slipping on the lower lid body 100. - 特許庁

Further, the side portion 130 includes a stepped contact portion 131 that contacts the opening end of the container body 200, which will be described later, a skirt portion 132 that covers the opening end of the container body 200, and a lower end of the skirt portion 132. A skirt portion 132 of the side portion 130 is provided with a convex rib 134 projecting inward. Further, as shown in FIG. 2(c), the portion of the skirt portion 132 where the convex rib 134 is not provided hangs downward. The protruding rib 134 is formed in a short shape along the extending direction of the side portion 130 and is formed only near the corner portion 150 so as to be adjacent to the corner portion 150 . In addition, although the convex rib 134 is formed in a short shape only near the corner 150 , the convex rib 134 is not limited to this. It may be formed in a long shape so as to extend to both ends.

Further, as with the side portion 130 on one side, as shown in FIG. 1(b), the side portion 140 on the other side also has a stepped contact portion that contacts an opening end portion of the container body 200, which will be described later. 141, a skirt portion 142 that covers the opening end of the container body 200, and a collar portion 143 that extends laterally from the lower end of the skirt portion 142. The skirt portion 142 of the side portion 140 has an inner A protruding convex rib 144 is provided. The protruding rib 144 is formed in a short shape along the extending direction of the side portion 140 and is formed only near the corner portion 150 so as to be adjacent to the corner portion 150 . In addition, although the convex rib 144 is formed in a short shape only near the corner 150 , it is not limited to this. It may be formed in a long shape so as to extend to both ends.

In addition, the side portion 130 on one side and the side portion 140 on the other side are adjacent to both sides of the corner portion 150 , and the convex ribs 134 and the convex ribs 144 provided on each of the corner portions 150 They are separated from each other by sandwiching them. That is, the convex rib 134 and the convex rib 144 are not formed so as to cross the corner 150 , and the convex rib 134 and the convex rib 144 avoid the corner 150 so as not to overlap the corner 150 . It is formed on both sides of the corner portion 150 . Furthermore, the height H1 at which the protruding rib 134 is arranged (in other words, the height H1 from the lower end of the side portion 130) is the height H2 at which the protruding rib 144 is arranged (in other words, the height H1 from the lower end of the side portion 140). , and the convex rib 134 and the convex rib 144 are arranged at the same height in the vertical direction.

Although the lid body 100 has a substantially rectangular shape in a plan view, it is not limited to this. can have the shape of Note that the cover 100 can have any shape as long as it is polygonal in plan view and has corners 150. However, on both sides of at least one corner 150, adjacent side portions are convex. It has ribs.

Further, the lid body 100 is formed by sheet forming (for example, vacuum forming, pressure forming, hot plate pressure forming, vacuum pressure forming, double-sided vacuum forming, etc.) using a synthetic resin sheet of about 0.1 mm to 1.00 mm. For example, as the synthetic resin sheet, a sheet made of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polylactic acid, or the like, or a stretched sheet obtained by uniaxially or biaxially stretching these sheets can be used.

Next, FIG. 3 shows a container body 200 covered with the lid 100 of the present invention. 3(a) is a plan view of the container body 200, FIG. 3(b) is a front view of the container body 200, and FIG. 3(c) is a CC end view.

As shown in FIG. 3, the container body 200 has a shallow dish shape with an upward opening, and extends obliquely upward from one side of a flat bottom surface 210 that is substantially rectangular in plan view and an outer circumference 211 of the bottom surface 210 . A wall surface 230 and a wall surface 240 extending obliquely upward from the other side of the outer circumference 211 of the bottom surface 210 are provided. The wall surface 230 on one side and the wall surface 240 on the other side are connected to each other with a corner portion 250 interposed therebetween. Further, as shown in FIG. 3A, the wall surface 230 on one side has a curved shape that bulges outward in a plan view, and the wall surface 240 on one side also has a shape as shown in FIG. 3A. In addition, it has a curved shape that bulges outward in a plan view. Since the wall surfaces (230, 240) are curved so as to bulge outward, liquid leakage to the outside can be prevented when a content containing water is accommodated in the container body 200. - 特許庁

Although the container body 200 has a substantially rectangular shape in plan view so as to correspond to the lid 100 , the container body 200 is not limited to this. It can have any shape according to the shape of the lid 100 . Moreover, the wall surface 230 and the wall surface 240 on both sides have the same height. The container body 200 is formed by folding a paper sheet having a thickness of about 0.15 mm to 8.0 mm into a three-dimensional shape as shown in FIG. Although the type of paper is not particularly limited, depending on the desired application, paperboard such as kraft paper, white board, manila board, cup base paper, card paper, and ivory paper, and one or both sides of the paperboard A laminate provided with a thermoplastic resin layer can be used.

Next, a packaging container 300 in which the lid 100 of the present invention is fitted to the container body 200 will be described with reference to FIGS. 4 and 5. FIG. 4(a) is a plan view of the packaging container 300, FIG. 4(b) is an enlarged perspective view of the vicinity of the corner of the packaging container 300, and FIG. 5(a) is the packaging container 300. 5(b) is a DD end view of FIG. 4(a), FIG. 5(c) is an EE end view of FIG. 4(a), and FIG. 5(d) is a view of FIG. It is an FF end view of (a).

As shown in FIGS. 4 and 5 , the lid 100 is placed over the container body 200 and attached so that the corners 150 of the lid 100 fit into the corners 250 of the container body 200 . At this time, as shown in FIG. 5(b), the convex rib 134 of one side portion 130 of the lid 100 comes into contact with the wall surface 230 of the container body 200 from the outside. Then, the convex rib 134 of the lid 100 is engaged with the wall surface 230 of the container body 200 so as to press it inward. Similarly, as shown in FIG. 5(c), the convex rib 144 of the other side portion 140 of the lid 100 contacts the wall surface 240 of the container body 200 from the outside. Then, the convex rib 144 of the lid 100 is engaged with the wall surface 240 of the container body 200 so as to press it inward.

Therefore, the convex ribs 134 and the convex ribs 144 arranged on both sides of the corner 150 of the lid body 100 engage with the wall surfaces 230 and 240 on both sides of the corner 250 of the container body 200 so as to sandwich the wall surfaces 230 and 240 from the outside. Therefore, the lid body 100 is firmly fitted so as not to come off from the container body 200 inadvertently. At this time, even if the container body 200 is made of paper, the bent corners 250 have high strength. Engagement in a sandwiching manner provides a strong feeling of fitting, and makes it easy to recognize the sound of fitting, making it easy to confirm failures in fitting from the sound and feel of fitting.

Furthermore, since the convex ribs 134 and the convex ribs 144 on both sides of the lid 100 are separated from each other with the corners 150 interposed therebetween, they abut on the corners 250 of the container body 200 corresponding to the corners 150 of the lid 100 . never Therefore, even if the lid 100 is fitted to the container body 200, the shape of the opening of the container body 200 (especially around the corners 250) can be prevented from being distorted. In addition, since the convex ribs 134 and the convex ribs 144 on both sides of the lid 100 are separated from each other with the corner 150 interposed therebetween, when the lid 100 is opened and closed, the sharp corners of the container main body 200 may be removed. The lid 100 is easy to open and close without being caught by the lid 250. - 特許庁

In addition, since the convex ribs 134 and the convex ribs 144 on both sides of the lid body 100 press the corners 250 of the container body 200 from the outside so as to pinch (or pinch) the corners 250 of the container body 200, the corners 250 of the container body 200 are pushed inward. is slightly bent in a "dogleg" shape, or a stress is applied in the direction of bending in a "dogleg" shape. Therefore, since the buckling strength of the corner portion 250 is temporarily increased, the feel of fitting is strongly transmitted, the sound of fitting is easily recognized, and the shape of the opening of the container body 200 (especially , around the corner 250) can be prevented from being distorted.

Note that the lid 100 can be tightly fitted to the container body 200 by means of the convex ribs 134 and the convex ribs 144 on both sides of the corner portion 150 . There is no need to provide a special structure (for example, a groove into which the convex rib 134 is fitted) for engaging with. Specifically, the wall surface 230 and the wall surface 240 of the container body 200 are flat surfaces without irregularities, but the convex ribs 134 and the convex ribs 144 on both sides of the corner portion 150 allow the container body 200 to be firmly fitted. ing. Note that the convex rib 134 and the convex rib 144 can have any shape as long as they protrude inward. For example, when the wall surface 230 and the wall surface 240 of the container body 200 are flat surfaces without irregularities, as shown in FIGS. It may be formed with an inclined surface so that it can be engaged in surface contact with 240 . Although the container body 200 to which the lid 100 is fitted is made of paper, it is not limited to this, and the container body 200 may be made of any material such as synthetic resin.

Further, when the lid 100 is attached to cover the container body 200, as shown in FIGS. Since the opening end 231 and the opening end 241 are in contact with each other, the cover 100 can be stably placed on the container body 200 and maintained. Further, as shown in FIG. 5(b), a concave portion 135 is formed on the lower side of the contact portion 131 by a convex rib 134 protruding inward, and the opening end of the container body 200 is formed in the concave portion 135. Part 231 is included. Therefore, the opening end portion 231 of the container body 200 that has entered the recessed portion 135 is surrounded by the contact portion 131 and the convex rib 134 and is not easily displaced in the vertical and horizontal directions. can be kept stable. Similarly, as shown in FIG. 5(c), a concave portion 145 is formed on the lower side of the contact portion 141 by a convex rib 144 protruding inward, and the container body 200 opens in the concave portion 145. End 241 is recessed. Therefore, the opening end portion 241 of the container body 200 that has entered the recessed portion 145 is surrounded by the contact portion 141 and the convex rib 144 and is not easily displaced vertically and horizontally. can be kept stable.

Moreover, since the convex rib 134 is provided only near the corner 150, as shown in FIG. It does not engage the wall surface 230 of 200 and does not abut to press the wall surface 230 inward. Therefore, there is a so-called play between the portion where the convex rib 134 is not provided (the skirt portion 132 in FIG. 5) and the wall surface 230 where they are not engaged with each other. Similarly, between the portion (skirt portion 142) where the convex rib 144 is not provided and the wall surface 240, there is a portion that is not engaged with each other, a so-called play.

However, since the convex ribs 134 and the convex ribs 144 on both sides of the corner 150 of the lid 100 are tightly fitted to the container body 200, the lid 100 will not come off from the container body 200 inadvertently. . Further, as shown in FIG. 5(d), in the portion (skirt portion 132 in FIG. 5) where the protruding rib 134 is not provided, the lid 100 and the container body 200 are sealed by tape or side shrink. can also At this time, since there is a so-called play between the portion where the convex rib 134 is not provided and the wall surface 230, the lid 100 and the container main body 200 are taped or side-mounted. The play can be used to easily and slightly deform the wall surface 230 of the container body 200 and the side portion 130 of the lid 100 so as to facilitate shrinking.

Although the convex rib 134 and the convex rib 144 are formed in a short shape only near the corner 150, the present invention is not limited to this. It may be formed in a long shape along the direction so as to extend to both ends of the side portion. For example, if the protruding rib 134 is formed in a short shape only near the corner 150, the engagement area between the protruding rib 134 and the wall surface 230 becomes narrow, so the engagement between the protruding rib 134 and the wall surface 230 is strengthened. For this purpose, the depth (projection height) D1 of the convex rib 134 is set to 0.7 mm. On the other hand, when the convex rib 134 is formed in an elongated shape, the engagement area between the convex rib 134 and the wall surface 230 becomes large, and the engagement is strong as a whole. It is set as shallow as 0.5 mm. By making the depth D1 of the elongated convex rib 134 shallow, the shallow convex rib 134 lightly presses the opening of the container body 200 inward over a wide range when the lid body 100 and the container body 200 are fitted. Therefore, it is possible to effectively prevent the shape of the opening of the container body 200 from being distorted. Note that the depth D1 and the shape of the convex rib 144 can also be appropriately changed in the same manner as the convex rib 134 described above.

In addition, the convex rib 134 is provided in one step on the side portion 130, that is, provided one in the vertical direction, but is not limited to this, and is provided in two or more steps on the side portion 130, that is, in the vertical direction. You may provide two or more in a direction. By providing two or more convex ribs 134 in the vertical direction, the vertically arranged convex ribs 134 engage with the wall surface 230 over a wider area, so that the fitting between the lid body 100 and the container body 200 is stronger. become. Similarly, the convex rib 144 is provided in one step on the side portion 140, that is, provided one in the vertical direction, but is not limited to this, and is provided in two or more steps on the side portion 140, that is, Two or more may be provided in the vertical direction. In this manner, one or both of the convex ribs positioned on both sides of the corner portion 150 may be provided two or more in the vertical direction on the side portion where each convex rib is provided.

Further, the side portion 130 and the side portion 140 of the lid body 100 have a curved shape that bulges outward in plan view in accordance with the respective shapes of the wall surface 230 and the wall surface 240 of the container body 200 . Therefore, even if the lid 100 and the container body 200 are fitted together, the wall surface 230 and the wall surface 240 of the container body 200 are excessively pressed inward by the side portions 130 and 140 of the lid member 100 and deformed. Therefore, it is possible to prevent the shape of the opening of the container body 200 from being distorted. Further, when fitting, the wall surface 230 and the wall surface 240 of the container body 200 can easily maintain a curved shape that expands outward. 230 and wall surface 240 can strongly abut each other, and can strongly maintain mutual engagement.

Note that the side portion 130 and the side portion 140 of the lid body 100 have a curved shape that bulges outward in a plan view, but the present invention is not limited to this, and the side portion 130 and the side portion 140 may be curved. At least one of them may have any shape, such as extending linearly in a plan view. Similarly, the opening end portion 231 and the opening end portion 241 of the container body 200 have a curved shape that bulges outward in a plan view, but the opening end portion 231 and the opening end portion 241 are not limited thereto. may have any shape, such as extending linearly in a plan view.

In addition, the wall surface 230 and the wall surface 240 of the container body 200 are inclined outward so as to be strongly engaged with the side portions 130 and 140 of the lid 100, but are not limited thereto. The wall surface 230 and the wall surface 240 of the container body 200 may be arranged vertically or may be slanted further outward as long as they can be engaged with the side portions 130 and 140 of the lid 100 respectively. may be in the shape of In addition, the wall surface 230 and the wall surface 240 of the container body 200 are flat surfaces without unevenness, but the present invention is not limited to this. It may have any shape, such as having a multi-step inclined surface. Further, when the lid 100 is fitted to the container body 200, the abutting portion of the lid 100 abuts the opening end of the container body 200, so that the lid 100 is stably fitted so as not to tilt. However, it is not limited to this, and a part of the top surface 110 of the lid 100 is brought into contact with the opening end of the container body 200 to stably fit the lid 100 so that it does not tilt. good too. Also, in all the four corners 150 of the lid 100 , convex ribs are provided on both sides of each corner 150 , but the present invention is not limited to this. Convex ribs may be provided on both sides of the corner 150 .

<Embodiment 2>
Next, FIGS. 6 to 8 show a lid body 100A according to Embodiment 2 of the present invention. Note that the configuration of the lid 100A of the second embodiment differs from the lid 100 of the first embodiment shown in FIGS. 1 and 2 only in the overall shape and arrangement of the convex ribs. Since it is basically the same as the lid body 100 according to the form 1, detailed description is omitted. 6(a) is a plan view of the lid 100A according to the second embodiment, FIG. 6(b) is an enlarged perspective view of the periphery of the corner of the lid 100A, and FIG. 7(a) is a lid. 100A front view, FIG. 7(b) is a side view of the lid 100A, FIG. 8(a) is a GG end view of FIG. 6(a), FIG. 8(b) is FIG. 6(a) is a HH end view of.

As shown in FIGS. 6 and 7, the lid 100A has a shallow plate shape that is open downward, and includes a flat top surface 110A that is approximately square in plan view and an outer periphery 111A of the top surface 110A. A side portion 130A extending toward the top surface 110A and a side portion 140A extending obliquely downward from the other side of the outer periphery 111A of the top surface 110A. The side portion 130A on one side and the side portion 140A on the other side are connected to each other with a corner portion 150A interposed therebetween. Further, a deviation prevention portion 121A is provided at a corner of the outer periphery 111A of the top surface 110A so as to protrude upward from the surface of the top surface 110A.

Furthermore, a convex rib 134A that protrudes inward is provided on the upper end side of the side portion 130A. It is formed linearly so as to extend. Similarly, the lower end side of the side portion 140A is provided with a convex rib 144A protruding inward. It is formed in a straight line so as to extend to the

In addition, the side portion 130A on one side and the side portion 140A on the other side are adjacent to both sides of the corner portion 150A, and the convex ribs 134A and the convex ribs 144A provided on the respective side portions extend across the corner portion 150A. They are separated from each other by sandwiching them. Furthermore, the height H3 at which the convex rib 134A is arranged (in other words, the height H3 from the lower end of the side portion 130A) is the height H4 at which the convex rib 144A is arranged (in other words, the height H3 from the side portion 140A). The convex rib 134A and the convex rib 144A are arranged at different heights in the vertical direction.

Next, FIGS. 9 and 10 show a container body 200A covered with a lid body 100A according to Embodiment 2 of the present invention. 9(a) is a plan view of the container body 200A, FIG. 9(b) is a front view of the container body 200A, FIG. 9(c) is a side view of the container body 200A, and FIG. 10(a) is an end view along II, and FIG. 10(b) is an end view along JJ in FIG. 9(a). Note that the configuration of the container body 200A according to the second embodiment differs from the container body 200 according to the first embodiment shown in FIG. Since it is basically the same as the container main body 200, detailed description will be omitted.

As shown in FIG. 9, the container body 200A has a shallow dish shape with an upward opening, and extends obliquely upward from one side of a flat bottom surface 210A that is substantially square in plan view and an outer circumference 211A of the bottom surface 210A. It has a wall surface 230A and a wall surface 240A extending obliquely upward from the other side of the outer circumference 211A of the bottom surface 210A. The wall surface 230A on one side and the wall surface 240A on the other side are connected to each other with a corner portion 250A interposed therebetween. The opening end 231A of the wall surface 230A on one side is folded outward, and the height of the wall surface 230A is equal to the height of the wall surface 240A on the other side.

Next, a packaging container 300A in which a lid 100A according to Embodiment 2 of the present invention is fitted to a container body 200A will be described with reference to FIGS. 11 to 13. FIG. 11(a) is a plan view of the packaging container 300A, FIG. 11(b) is an enlarged perspective view of the vicinity of the corner of the packaging container 300A, and FIG. 12(a) is the packaging container 300A. 12(b) is a side view of the packaging container 300A, FIG. 13(a) is a KK end view of FIG. 11(a), and FIG. 13(b) is a It is an LL end view.

As shown in FIGS. 11 to 13, the lid 100A is placed over the container body 200A, and attached so that the corners 150A of the lid 100A fit into the corners 250A of the container body 200A. At that time, as shown in FIG. 13(a), the convex rib 134A of the side portion 130A of the lid 100A comes into contact with the wall surface 240A of the container body 200A from the outside. Then, the convex rib 134A of the lid 100A is engaged with the wall surface 240A of the container body 200A so as to press it inward. Similarly, as shown in FIG. 13(b), the convex rib 144A of the side portion 140A of the lid 100A comes into contact with the wall surface 240A of the container body 200A from the outside. Then, the convex rib 144A of the lid 100A engages the wall surface 230A of the container body 200A so as to press it inward. Therefore, the convex rib 134A and the convex rib 144A arranged on both sides of the corner 150A of the lid body 100A are engaged with the wall surfaces 230A and 240A on both sides of the corner 250A of the container body 200A so as to be sandwiched from the outside. Therefore, the lid 100A is firmly fitted so as not to come off accidentally from the container body 200A. At this time, even if the container body 200A is made of paper, the bent corners 250A have high strength. By pinching, the feel of fitting can be strongly transmitted, and the sound of fitting can be easily recognized, making it easy to confirm failures in fitting from the sound and feel of fitting.

Further, as shown in FIG. 13(b), the convex rib 144A of the lid 100A is engaged with the lower side of the open end portion 231A of the wall surface 230A, so that the lid 100A is separated from the container main body 200A. It is possible to maintain a tightly fitted state so as not to come off carelessly. In this way, the lid 100A has a wall surface 230A with a folded open end 231A and a wall surface 240A with a non-folded open end 241A of the container body 200A. Corresponding to the wall surface 240A, the convex ribs 134A and the convex ribs 144A are arranged at different heights in the vertical direction. Therefore, as shown in FIG. 13(a), the convex rib 134A positioned above is firmly engaged with the wall surface 240A. On the other hand, as shown in FIG. 13(b), the lower protruding rib 144A is firmly engaged with the wall surface 230A. In addition, as shown in FIG. 13(a), the opening end 241A of the wall surface 240A contacts a part of the top surface 110A of the lid 100A, and as shown in FIG. 13(b), the opening end of the wall surface 230A Since the upper end of the portion 231A is in contact with a portion of the top surface 110A of the lid 100A, the lid 100A can stably maintain the state of covering the container body 200A without tilting.

Furthermore, since the convex ribs 134A and the convex ribs 144A on both sides of the lid 100A are separated from each other with the corner 150A interposed therebetween, they come into contact with the corner 250A of the container body 200A corresponding to the corner 150A of the lid 100A. never Therefore, even if the lid 100A is fitted to the container body 200A, the shape of the opening of the container body 200A (especially around the corners 250A) can be prevented from being distorted.

In addition, the convex rib 134A is provided in one step on the side portion 130A, that is, provided one in the vertical direction, but is not limited to this, and is provided in two or more steps on the side portion 130A, that is, in the vertical direction. You may provide two or more in a direction. Similarly, the convex rib 144A is provided in one step on the side portion 140A, that is, provided one in the vertical direction. Two or more may be provided in the vertical direction. In this manner, one or both of the convex ribs positioned on both sides of the corner portion 150A may be provided two or more in the vertical direction on the side portion where each convex rib is provided. Furthermore, since the two or more convex ribs arranged vertically on the side part engage with the wall surface over a wider area, the fitting between the lid body 100A and the container body 200A becomes stronger.

Further, when the wall surface 230A having the folded open end 231A and the wall surface 240A having the unfolded open end 241A are provided as in the case of the container body 200A, when fitting the lid body 100A, It is necessary to confirm the mounting direction of the lid body 100A so that the convex rib 134A positioned above engages with the wall surface 240A and the convex rib 144A positioned below engages with the wall surface 230A. . However, if two or more convex ribs are provided in the vertical direction on each side, at least the upper convex rib or the lower convex rib can engage with either the wall surface 230A or the wall surface 240A. There is no need to confirm the mounting direction of the lid 100A.

The synthetic resin cover of the present invention is not limited to the above examples, and various modifications and combinations are possible within the scope of the claims and the embodiments. Modifications and combinations of are also included in the scope of the right.

Claims (4)

A synthetic resin lid body comprising a top surface, side portions extending downward from the outer periphery of the top surface, and corner portions,
Convex ribs protruding inward are formed on the side portions adjacent to both sides of the corner portion,
A cover made of synthetic resin, wherein the protruding ribs are spaced apart from each other with the corners interposed therebetween, and are arranged at the same height or at different heights in the vertical direction.
2. The lid made of synthetic resin according to claim 1, wherein the convex rib is provided near the corner on the side portion.
3. The lid body made of synthetic resin according to claim 1, wherein at least two or more of the projecting ribs are provided in the vertical direction on the side portion where the projecting ribs are provided.
The synthetic resin lid according to any one of claims 1 to 3, wherein the side portion has a shape that bulges outward in a plan view.

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