Lid body

Abstract

To provide a lid body that can be easily fitted to a container body without being pressed with a strong force.SOLUTION: A lid body 100 has a polygonal shape in plan view and includes a corner portion 170 and a side portion 101, and fits into the container body 200. The corner portion 170 extends downward beyond the side portion 101, and a fitting portion 150 for fitting into the container body 200 is formed in the corner portion 170.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lid. [Background technology]

[0002] BACKGROUND ART Packaging containers for storing food such as prepared dishes and sushi have been used in supermarkets, convenience stores, and the like.

[0003] There are various types of packaging containers, and the packaging container of Patent Document 1 has a fitting portion provided at the corner of the lid, which fits onto the outside of the container body. Furthermore, when placing food or the like in a packaging container and sealing it with a lid in the back-of-house area of ​​a supermarket, convenience store, or the like, it is desirable to be able to easily fit the lid without having to press the lid with great force, in order to reduce the burden on workers. Furthermore, to alleviate labor shortages, it is conceivable that in the future, the work of placing food or the like in a packaging container and sealing it with a lid will be automated using machines such as robots. However, if a machine such as a robot presses the lid with great force, the packaging container may be crushed or deformed. Therefore, it is desirable to be able to easily fit the lid without pressing the lid with great force. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6088740 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problem, the present invention provides a lid that can be easily fitted to a container body without the need for a strong pressing force. [Means for solving the problem]

[0006] In order to solve the above problem, the lid body of claim 1 of the present invention is a lid body that has a polygonal shape in a planar view and has corner portions and side portions, and that fits into a container body, and is characterized in that the corner portions extend downward beyond the side portions, and fitting portions for fitting into the container body are formed in the corner portions.

[0007] According to the above feature, stress is concentrated on the fitting portion arranged at the corner, making it easy to fit the lid to the container body. In other words, the lid can be easily fitted to the container body with a weak force, without having to press the lid with a strong force.

[0008] In order to solve the above problem, the lid according to claim 2 of the present invention is characterized in that the corner portion has an inclined portion that is inclined downward toward the tip of the corner portion.

[0009] According to the above feature, when the top surface of the lid is pressed from above, stress is further concentrated toward the tip of the inclined corner, which further concentrates stress on the tip side of the fitting portion located at the corner, making it easier to fit the lid to the container body.

[0010] In order to solve the above problem, the lid according to claim 3 of the present invention is characterized in that a part of the fitting portion is inclined downward toward the tip of the corner portion.

[0011] According to the above feature, when the top surface of the lid is pressed from above, stress is further concentrated near the contact point between the inclined portion of the fitting portion (the inclined fitting portion) and the container body, which makes it easier to fit the fitting portion to the container body starting from the inclined fitting portion. [Effects of the Invention]

[0012] The lid of the present invention can be easily fitted to the container body without applying a strong force. [Brief explanation of the drawings]

[0013] [Figure 1]1(a) is a plan view of the lid body 100, FIG. 1(b) is a front view of the lid body 100, and FIG. 1(c) is a side view of the lid body 100. As shown in FIG. [Figure 2] Figure 2(a) is an enlarged plan view of the area around corner portion 170 of lid body 100, Figure 2(b) is an enlarged front view of the area around corner portion 170 of lid body 100, and Figure 2(c) is an enlarged side view of the area around corner portion 170 of lid body 100. [Figure 3] 3(a) is a cross-sectional view taken along line AA, FIG. 3(b) is a cross-sectional view taken along line BB, and FIG. 3(c) is a cross-sectional view taken along line CC. [Figure 4] 4(a) is a plan view of the container body 200, FIG. 4(b) is a front view of the container body 200, and FIG. 4(c) is a side view of the container body 200. As shown in FIG. [Figure 5] Figure 5(a) is a front view of a packaging container 300 having a lid body 100 and a container body 200, in which the lid body 100 is placed on the container body 200, Figure 5(b) is an enlarged front view of the state in which the lid body 100 is pressed downward from the state shown in Figure 5(a) to engage with the container body 200, and Figure 5(c) is an enlarged front view of the state in which the lid body 100 is engaged with the container body 200. [Explanation of symbols]

[0014] 100 Lid 101 Side 150 fitting part 170 Corner section 200 container body DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, "upward" refers to a direction that faces upward in the vertical direction when the packaging container is placed on a horizontal surface, and "downward" refers to a direction that faces downward in the vertical direction.

[0016] First, Figures 1 to 3 show a lid 100 of a packaging container 300 according to the present invention. Figure 1(a) is a plan view of the lid 100, Figure 1(b) is a front view of the lid 100, Figure 1(c) is a side view of the lid 100, Figure 2(a) is an enlarged plan view of the periphery of a corner portion 170 of the lid 100, Figure 2(b) is an enlarged front view of the periphery of the corner portion 170 of the lid 100, Figure 2(c) is an enlarged side view of the periphery of the corner portion 170 of the lid 100, Figure 3(a) is an A-A cross-sectional view, Figure 3(b) is a B-B cross-sectional view, and Figure 3(c) is a C-C cross-sectional view.

[0017] As shown in FIGS. 1 to 3 , the lid 100 is made of a synthetic resin sheet, has a shallow dish shape that opens downward, and has a generally rectangular shape in plan view with corner portions 170 at the four corners. The lid 100 includes a flat, horizontally extending top surface 110, a sidewall 120 that extends downward from the top surface 110, a flange 130 that extends outward from the sidewall 120, and a skirt 140 that extends downward from the flange 130. The skirt 140 is provided with intermittent mating portions 150 that are convex inward. The sidewall 120, the flange 130, and the skirt 140 are provided continuously or intermittently around the entire periphery of the lid 100. The lid 100 is generally rectangular in plan view, but is not limited thereto and may be a square in plan view or any other generally polygonal shape in plan view.

[0018] The lid 100 also has a corner portion 170 and side portions 101 on both sides of the corner portion 170. The skirt portion 140 located at the side portion 101 has a side skirt portion 141 extending horizontally, and a side lower end 142 of the side skirt portion 141 extends linearly in the horizontal direction. The skirt portion 140 located at the corner portion 170 has a downward extension portion 143 extending downward from the side portion 101, and a corner lower end 144 of the downward extension portion 143 is located below the side lower end 142 of the side skirt portion 141 and extends linearly in the horizontal direction. The skirt portion 140 at the corner portion 170 also has an inclined portion 145 inclined toward the tip 171 of the corner portion 170, and an inclined lower end 146 of the inclined portion 145 inclined downward from the side lower end 142 toward the corner lower end 144.

[0019] 1(b), the fitting portion 150 provided on the skirt portion 140 of the side portion 101 on the long side extends linearly. On the other hand, the fitting portion 150 provided on the skirt portion 140 of the corner portion 170 has a shape in which a portion of the fitting portion 150 is inclined toward the tip 171 of the corner portion 170, and includes an upper fitting portion 151, an inclined fitting portion 152, and a lower fitting portion 153. The upper fitting portion 151 is provided near the boundary between the side skirt portion 141 of the side portion 101 and the downward extension portion 143 of the corner portion 170, and extends linearly in the horizontal direction. The inclined fitting portion 152 is provided on the inclined portion 145 of the corner portion 170, and extends downward toward the tip 171 of the corner portion 170. The lower fitting portion 153 is provided on the tip 171 side of the downward extending portion 143 of the corner portion 170, and extends linearly in the horizontal direction.

[0020] The fitting portion 150 has an upper fitting portion 151 and a lower fitting portion 153 at both ends, and an inclined fitting portion 152 that slopes downward from the upper fitting portion 151 to the lower fitting portion 153, and has a shape in which the height decreases stepwise from the side portion 101 to the tip 171 of the corner portion 170. Specifically, as shown in FIG. 3(a), the height of the upper fitting portion 151 is defined as L1, which is the vertical height from the tip 171 of the corner portion 170 (or the corner portion lower end 144). Similarly, as shown in FIG. 3(b), the height of the inclined fitting portion 152 is defined as L2, which is the vertical height from the tip 171 of the corner portion 170 (or the corner portion lower end 144). Similarly, as shown in FIG. 3(c), the height of the lower fitting portion 153 is defined as L3, which is the vertical height from the tip 171 of the corner portion 170 (or the corner portion lower end 144).

[0021] Then, height L3 of lower fitting portion 153 is lower than height L2 of inclined fitting portion 152, and height L2 of inclined fitting portion 152 is lower than height L1 of upper fitting portion 151 (height L3<height L2<height L1). Note that fitting portion 150 is not limited to a shape in which its height decreases stepwise from side portion 101 to tip 171 of corner portion 170, and may have any shape as long as it has a portion that slopes downward toward tip 171 of corner portion 170, such as a shape that slopes linearly from side portion 101 to tip 171 of corner portion 170. Furthermore, fitting portion 150 has a portion that slopes downward toward tip 171 of corner portion 170, but is not limited thereto, and fitting portion 150 may have any shape, such as a shape that extends linearly in the horizontal direction from side portion 101 to tip 171 of corner portion 170.

[0022] The lid body 100 is formed by sheet molding (e.g., vacuum molding, pressure molding, hot plate molding) using a sheet-shaped synthetic resin with a thickness of approximately 0.1 mm to 1.0 mm (millimeters). For example, the material for the lid body 100 may be polystyrene, polypropylene, polyethylene, A-PET, polylactic acid, or biaxially stretched versions of these.

[0023] Next, Fig. 4 shows the container body 200 of the packaging container 300 according to the present invention. Fig. 4(a) is a plan view of the container body 200, Fig. 4(b) is a front view of the container body 200, and Fig. 4(c) is a side view of the container body 200.

[0024] As shown in FIG. 4 , the container body 200 is made of a synthetic resin sheet, has a shallow dish shape that opens upward, and is generally rectangular in plan view with corner portions 270 at the four corners. The container body 200 includes a flat, horizontally extending bottom surface 210, a sidewall portion 220 that extends upward from the bottom surface 210, and a skirt portion 240 that extends downward from an upper end 230 of the sidewall portion 220. An outwardly convex mating portion 250 is provided at the lower end of the skirt portion 240. The mating portion 250 extends linearly in the horizontal direction and is configured so that the mating portion 150 of the lid 100 can be externally mated. The sidewall portion 220, the upper end 230, the skirt portion 240, and the mating portion 250 are provided continuously or intermittently around the entire periphery of the container body 200. Furthermore, although the container body 200 has a generally rectangular shape in plan view, this is not limited thereto, and it may have a square shape in plan view or any other generally polygonal shape in plan view, as long as it can fit the lid 100. Note that although the fitting form between the lid and the body in the present invention is external fitting, this is not limited thereto, and any other fitting form may be used, such as internal fitting, external fitting, internal and external fitting, or surface fitting.

[0025] The container body 200 is formed by sheet molding (e.g., vacuum molding, compressed air molding, hot plate molding) using a sheet-shaped synthetic resin having a thickness of approximately 0.1 mm to 1.0 mm (millimeters). For example, the sheet-shaped synthetic resin may be expanded polystyrene, expanded polypropylene, expanded polyethylene terephthalate, etc.

[0026] Next, Fig. 5 illustrates a mode of attaching the lid body 100 to the container body 200. Fig. 5(a) is a front view of a packaging container 300 including the lid body 100 and the container body 200, in which the lid body 100 is placed on the container body 200, Fig. 5(b) is an enlarged front view of the lid body 100 being pressed downward from the state shown in Fig. 5(a) to fit onto the container body 200, and Fig. 5(c) is an enlarged front view of the lid body 100 fitted onto the container body 200.

[0027] 5(a) and (b), the packaging container 300 is sealed with the lid 100 while the contents are contained inside the container body 200. In this case, the lid 100 is first placed so that it lightly covers the container body 200. In this state, as shown in FIG. 5(b), the lower fitting portion 153 of the fitting portion 150 of the lid 100 is in contact with the fitted portion 250 of the container body 200 from above, and the fitting portion 150 of the lid 100 is not fitted into the fitted portion 250 of the container body 200.

[0028] Next, as shown in Fig. 5(b), the top surface 110 of the lid 100 is lightly pressed from above. The downward extension 143 of the corner portion 170 causes the corner portion 170 to extend downward further than the side portion 101. Therefore, the pressing force is concentrated around the downward extension 143 of the corner portion 170, and as shown in Fig. 5(c), stress is concentrated on the fitting portion 150 arranged in the corner portion 170, allowing it to easily fit into the fitted portion 250. In other words, the lid 100 can be easily fitted into the container body 200 with a weak force, without having to press the lid 100 with a strong force. When the mating portion 150 is mated with the mated portion 250, the pressing force concentrated around the downward extension portion 143 of the corner portion 170 elastically deforms the area around the mated portion 250 of the container body 200 so that it bends slightly inward, or elastically deforms the area around the skirt portion 140 of the corner portion 170 so that it bends slightly outward, thereby causing the mating portion 150 to be externally fitted into the mated portion 250.

[0029] Moreover, corner portion 170 has inclined portion 145 inclined toward tip 171, so when top surface 110 of lid 100 is pressed from above, stress directed toward tip 171 is further concentrated on inclined portion 145 of corner portion 170. Therefore, stress is further concentrated on the tip side (tip 171 side) of fitting portion 150 arranged in corner portion 170, making it easier to fit into fitted portion 250.

[0030] Furthermore, a portion of the fitting portion 150 forms an inclined fitting portion 152 that is inclined downward toward the tip 171 of the corner portion 170. Therefore, when the top surface 110 of the lid 100 is pressed from above, stress is further concentrated near the contact point P1 between the inclined fitting portion 152 of the fitting portion 150 and the fitted portion 250 of the container body 200. Therefore, the fitting portion 150 can be easily fitted into the fitted portion 250 starting from the inclined fitting portion 152.

[0031] Furthermore, when the entire fitting portion 150 is fitted into the fitted portion 250 starting from the inclined fitting portion 152, stress is first transmitted from the inclined fitting portion 152 to the lower fitting portion 153 adjacent to the inclined fitting portion 152, and a downward pressing force is effectively applied to the lower fitting portion 153, causing the lower fitting portion 153 to be pushed downward so as to overcome the fitted portion 250 and fit into the fitted portion 250. At the same time, the inclined fitting portion 152 also moves downward, but stress continues to be concentrated near the contact point P1 between the inclined fitting portion 152 and the fitted portion 250, so that the inclined fitting portion 152 can easily fit into the fitted portion 250. Furthermore, even if the lid 100 is pressed with a weak force, the concentration of stress on the inclined fitting portion 152 causes the periphery of the fitted portion 250 in contact with the inclined fitting portion 152 to be elastically deformed so as to bend slightly inward, or the periphery of the skirt portion 140 on which the inclined fitting portion 152 is disposed to be elastically deformed so as to bend slightly outward. Therefore, the upper fitting portion 151, which is continuous with the inclined fitting portion 152, can also be easily fitted into the fitted portion 250.

[0032] The lid 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 scope of the embodiments, and these modifications and combinations are also included in the scope of rights.

Claims

1. A lid body having a polygonal shape in a plan view, which has corner portions and side portions and fits onto a container body, The corner portion extends downward beyond the side portion, A lid body characterized in that a fitting portion for fitting onto the container body is formed at the corner portion.

2. The lid according to claim 1 , wherein the corner portion has an inclined portion that is inclined downward toward a tip of the corner portion.

3. 3. The lid according to claim 1, wherein a part of the fitting portion is inclined downward toward a tip of the corner portion.

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