Packaging container

Abstract

To improve workability of a lid-closing work.SOLUTION: A packaging container comprises a container body 1 and a lid body 2 made of a synthetic resin sheet. The container body 1 includes a body bottom surface part 10 on which an object to be stored is placed, and a leg part 14 protruding to the downside of the body bottom surface part 10. The leg part 14 includes an installation bottom surface part whose lower surface comes into contact with a container placing surface where the container body 1 is installed, and a body fitting part 15 for maintaining a lid-closed state. The lid body 2 includes an entering protrusion part 34 which is protruded downward and enters the inside of the leg part 14. The entering protrusion part 34 has a contact tip part whose lower surface comes into contact with an upper surface of the installation bottom surface part, and a lid fitting part 35 fitted to the body fitting part 15 so as to maintain the lid-closed state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging container for containing food products. [Background technology]

[0002] In the internal fitting container described in Patent Document 1 below, a fitting portion is provided at a position above and away from the legs. When fitting the lid body to the container body, a force acts on the vicinity of the fitting portion of the container body in the outward and downward directions, and the portion near the fitting portion is likely to deform toward the outside and downward of the container. This makes it difficult to fit the lid body to the container body, and there is a demand for improving the efficiency of the lid closing operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-154968 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to improve the workability of the lid closing operation. [Means for solving the problem]

[0005] The packaging container of the present invention is a packaging container comprising a container body and a lid body made of a synthetic resin sheet, wherein the container body comprises a body bottom surface portion on which the contained item is placed and legs protruding downwardly from the body bottom surface portion, the legs having an installation bottom surface portion whose underside abuts the container placement surface on which the container body is placed and a body fitting portion for maintaining the lid closed state, the lid body comprises an entry protrusion protruding downwardly and entering the inside of the legs, and the entry protrusion has an abutment tip portion whose underside abuts the upper surface of the installation bottom surface portion and a lid fitting portion that fits into the body fitting portion to maintain the lid closed state.

[0006] According to this configuration, during the closing operation of putting the lid body on the container body, the entry protrusion of the lid body enters the inside of the leg of the container body. Then, in the closed state, the lower surface of the abutting tip of the entry protrusion of the lid body abuts on the upper surface of the installation bottom part of the leg of the container body. Then, the lid fitting part provided on the entry protrusion of the lid body fits into the body fitting part provided on the leg of the container body. The force pushing the lid body downward during the closing operation is transmitted from the abutting tip of the entry protrusion of the lid body to the installation bottom part of the leg of the container body, and from the installation bottom part of the container body to the container placement surface. Therefore, even if the lid body is pushed downward, the force is firmly received by the installation bottom part of the leg of the container body. Therefore, the entry protrusion of the lid body can easily enter the leg of the container body, and the lid fitting part of the entry protrusion can be easily and reliably fitted into the body fitting part of the leg, and the closed state can be reliably maintained by the fitting structure of the body fitting part and the lid fitting part. In addition, the lower surface of the abutting tip of the entry protrusion of the lid abuts against the upper surface of the installation bottom surface of the legs of the container body, so that the legs of the container body are not easily deformed during the lid closing operation, and the legs of the container body can be prevented from being crushed, and the lid fitting part can be reliably fitted into the body fitting part. Furthermore, since the legs form a double structure together with the entry protrusion, and the lower surface of the abutting tip abuts against the upper surface of the installation bottom surface, the strength of the legs can be greatly improved. Therefore, even when food is placed in the container, the legs are not easily deformed, and even if the sheet of the container body is made thin, deformation of the legs can be prevented. Moreover, even if the weight of the upper container acts on the lower container when the containers containing food are stacked one above the other in the closed state, the double-structured legs can firmly support the containers, and the stacked state of the containers is stable. And, since the legs are not easily deformed even in such a stacked state, the lid fitting part is not easily detached from the body fitting part provided on the legs, and inadvertent opening of the lid is prevented.

[0007] In particular, it is preferable that the length of the installation bottom portion in the container circumferential direction is longer than the length of the main body fitting portion in the container circumferential direction, and the length of the abutting tip portion in the container circumferential direction is longer than the length of the lid fitting portion in the container circumferential direction. When the sheet is thermoformed to form the container body and the lid, the sheet is deep drawn at the legs and the entry protrusions, but since the circumferential lengths of the main body fitting portion and the lid fitting portion are shorter than the installation bottom portion and the abutting tip, the mold can be easily removed, ensuring good moldability.

[0008] It is also preferable that the main body fitting portion is adjacent to the top of the installation bottom portion, and the lid fitting portion is adjacent to the top of the abutting tip portion. With this configuration, the main body fitting portion does not move significantly upward from the installation bottom portion, and the lid fitting portion does not move significantly upward from the abutting tip portion. Therefore, the lid fitting portion is less likely to come off the main body fitting portion, and the fitted state is more reliably maintained, and the closed state is more reliably maintained.

[0009] In addition, it is preferable that the container is rectangular in plan view, the legs and the entry protrusions are provided at the corners, the lid body has a lid flange portion on the outer side of the entry protrusion, the lid flange portion has a lid flange top surface portion and a skirt portion extending downward from the lid flange top surface portion, and a reinforcing uneven portion is provided at the center of the side of the lid flange top surface portion. According to this configuration, since the legs and the entry protrusions are provided at the corners, the container body is stabilized during the lid closing operation, and the lid fitting portion of the entry protrusion can be easily and reliably fitted into the body fitting portion of the legs. In addition, since the reinforcing uneven portion is provided on the lid flange top surface portion at the center of the side, the lid opening at the center of the side is also prevented. Note that the reinforcing uneven portion may be formed by providing a plurality of convex portions protruding upward at intervals in the circumferential direction of the container on the lid flange top surface portion, for example, or conversely, the reinforcing uneven portion may be formed by providing a plurality of concave portions recessed downward at intervals in the circumferential direction of the container on the lid flange top surface portion.

[0010] The container body includes a body peripheral wall portion provided around the body bottom surface portion and a body flange portion provided on the outer side of the container than the body peripheral wall portion, the legs are located between the body peripheral wall portion and the body flange portion, the body peripheral wall portion has an inner wall portion rising from the body bottom surface portion, a peripheral wall top portion provided at the upper end of the body peripheral wall portion, and an outer wall portion extending from the peripheral wall top portion to the outer side of the container and downward, and preferably a body step portion is provided between the legs and the outer wall portion, connecting the legs and the outer wall portion and having a height higher than the installation bottom surface portion and lower than the peripheral wall top portion. According to this configuration, the body peripheral wall portion protrudes upward and the legs protrude downward, but since the body step portion is provided between the body peripheral wall portion and the legs, the body peripheral wall portion and the legs can be easily and accurately molded.

[0011] In particular, it is preferable that the main body step portion is provided at least in a section of the entire circumferential length of the leg portion in the container direction that corresponds to the inside of the container where the main body fitting portion is provided. With this configuration, the mold can be easily removed from the leg portion, and the main body fitting portion can be accurately formed. Effect of the Invention

[0012] As described above, the entry protrusion of the lid body enters the leg of the container body and the underside of the abutting tip of the entry protrusion abuts against the upper surface of the bottom installation portion of the leg, so that the leg is less likely to deform during the lid closing operation, making the lid closing operation easy and allowing the lid fitting portion provided on the entry protrusion to be securely fitted into the body fitting portion provided on the leg. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view showing an open state of a packaging container in one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view of a corner portion of the container body as viewed from the top side. [Figure 6]FIG. [Figure 7] FIG. [Figure 8] FIG. 2 is a cross-sectional view of the main part of the container in an open state corresponding to line AA. [Figure 9] FIG. 2 is a cross-sectional view of the main part of the container, showing the closed state of the lid corresponding to line AA. [Figure 10] FIG. 4 is a cross-sectional view of the essential parts of the container, showing the open state of the lid corresponding to line BB of the container. [Figure 11] FIG. 4 is a cross-sectional view of a main part of the container, showing the closed state of the lid corresponding to line BB. [Figure 12] FIG. 4 is a cross-sectional view of the main part of the container showing the open state of the lid corresponding to the CC line. [Figure 13] FIG. 4 is a cross-sectional view of the main part of the container, showing the closed state of the lid corresponding to the CC line. [Figure 14] FIG. 13 is a cross-sectional view of the container in an open state corresponding to the DD line. [Figure 15] FIG. 13 is a cross-sectional view of the container in a closed state corresponding to the DD line. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A packaging container according to an embodiment of the present invention will be described below with reference to Figs. 1 to 15. The packaging container shown in Fig. 1 is a tray-shaped container for serving food, and the food is preferably sashimi or sushi. The container includes a container body 1 and a lid body 2. The container may have any shape in plan view, but in this embodiment, the container is rectangular in plan view, and more specifically, rectangular in plan view. Fig. 2 is a cross-sectional view of the container body 1 and the lid body 2 when the center of the short side part is cut along the long side direction. In Fig. 2, a container mounting surface 3 on which the container is placed is indicated by a two-dot chain line. In the following, the outside of the container will be simply referred to as the outside, the inside of the container will be simply referred to as the inside, the inward / outward direction of the container will be simply referred to as the inward / outward direction, and the circumferential direction of the container will be simply referred to as the circumferential direction.

[0015] Both the container body 1 and the lid 2 are made of a synthetic resin sheet. The container body 1 and the lid 2 are formed by various types of thermoforming (sheet forming) such as vacuum forming and compressed air forming. The synthetic resin sheets used for the container body 1 and the lid 2 may be the same or different. The material of the synthetic resin sheet is, for example, polyethylene terephthalate, polystyrene, polypropylene, polyethylene, or other polyolefins. In addition, as the sheet material, a sheet in which an inorganic substance is dispersed in the above-mentioned synthetic resin, a foamed sheet in which the above-mentioned synthetic resin is foamed, or a stretched sheet in which the above-mentioned sheet is stretched can be used.

[0016] A foamed resin sheet is particularly preferred for the container body 1. A sheet with excellent transparency is preferably used for the lid body 2, so that the contained foodstuffs can be visually confirmed from the outside of the lid body 2. Among them, a stretched sheet obtained by uniaxially or biaxially stretching transparent polyethylene terephthalate, polystyrene, polypropylene, etc. is preferred.

[0017] <Container body 1> The container body 1 includes a body bottom portion 10 having a rectangular shape in a plan view, a body peripheral wall portion 11 provided on the outside of the body bottom portion 10, a body side groove portion 12 provided on the outside of the body peripheral wall portion 11, and a body flange portion 13 provided on the outside of the body side groove portion 12. Food (not shown) is placed on the upper surface of the body bottom portion 10. The upper surface of the body bottom portion 10 is the food placement surface. Various ribs may be formed on the body bottom portion 10. The four corner portions of the body bottom portion 10 are chamfered. That is, the four corner portions have corner chamfer portions. The body bottom portion 10 is spaced above the container placement surface 3. That is, the lower surface of the body bottom portion 10 is raised above the container placement surface 3, and the lower surface of the body bottom portion 10 does not abut against the container placement surface 3. The height of the body bottom portion 10 is higher than the container placement surface 3. The main body bottom portion 10 is preferably parallel to the container mounting surface 3, but may be inclined.

[0018] The main body peripheral wall 11 is provided around the main body bottom surface portion 10. The main body peripheral wall 11 is provided around the entire circumference in the circumferential direction and surrounds the main body bottom surface portion 10 in a plan view. The main body peripheral wall 11 is formed from the peripheral edge of the main body bottom surface portion 10 toward the upper side. In detail, the main body peripheral wall 11 has a double-wall structure in the inner and outer directions. That is, the main body peripheral wall 11 has an inner wall portion 110, a peripheral wall top portion 111, and an outer wall portion 112. The inner wall portion 110 is located relatively inside, and the outer wall portion 112 is located relatively outside. The main body peripheral wall portion 11 has an inner and outer double structure by the inner wall portion 110 and the outer wall portion 112. The inner wall portion 110 rises upward from the peripheral edge of the main body bottom surface portion 10. The inner wall portion 110 extends upward while expanding outward from the main body bottom surface portion 10. The peripheral wall top 111 is provided at the upper end of the inner wall 110 and the outer wall 112, and connects the upper end of the inner wall 110 and the upper end of the outer wall 112 in the inner and outer directions. The peripheral wall top 111 constitutes the upper end of the main body peripheral wall 11. The peripheral wall top 111 is located above the main body bottom 10, and the height of the peripheral wall top 111 is higher than the height of the main body bottom 10. The peripheral wall top 111 is located at the uppermost position in the container main body 1. The outer wall 112 extends downward from the peripheral wall top 111. The outer wall 112 descends while expanding outward from the peripheral wall top 111. Therefore, the distance between the inner wall 110 and the outer wall 112 in the inner and outer directions gradually expands downward. The outer wall portion 112 may extend below the lower end of the inner wall portion 110 and may extend below the main body bottom portion 10 .

[0019] Of the entire circumference of the lower end of the outer wall portion 112, a main body side step portion 20 may be formed on four sides (two long sides and two short sides) excluding the corner portion (corner chamfer portion). The main body side step portion 20 is a main body step portion at the side. The main body side step portion 20 is formed at the lower end of the outer wall portion 112 so as to expand outward. The main body side step portion 20 also extends in a stripe shape along the side, i.e., along the circumferential direction. The main body side step portion 20 may be provided over the entire length of each side. The main body side step portion 20 is preferably located lower than the main body bottom surface portion 10. The height of the main body side step portion 20 is lower than the height of the main body bottom surface portion 10.

[0020] The four corners are each provided with a main body corner step 21. The main body corner step 21 is a main body step at the corner. The main body step is composed of the main body side step 20 and the main body corner step 21. The main body step is lower than the main body bottom surface 10. The main body corner step 21 extends from the lower end of the outer wall 112 at the corner so as to expand outward. The main body corner step 21 preferably extends substantially horizontally. The height of the main body corner step 21 is lower than the main body side step 20. Therefore, the main body corner step 21 is located lower than the main body bottom surface 10, and the height of the main body corner step 21 is lower than the height of the main body bottom surface 10. The main body corner step 21 is substantially triangular in plan view, and more specifically, substantially right-angled triangular in plan view.

[0021] Further, a corner reinforcing protrusion 22 is provided at the corner portion. The corner reinforcing protrusion 22 protrudes outward from the lower portion of the outer wall portion 112 and protrudes upward from the inner portion of the main body corner step portion 21 so as to connect the lower portion of the outer wall portion 112 and the inner portion of the main body corner step portion 21. The corner reinforcing protrusion 22 is triangular in plan view, more specifically, a substantially right-angled triangle in plan view, and has a similar shape to the main body corner step portion 21. Therefore, the corner reinforcing protrusion 22 is a triangular prism. By providing the corner reinforcing protrusion 22 in this manner, the corner portion of the container body 1 is effectively reinforced.

[0022] The main body groove portion 12 is provided so as to surround the outside of the main body peripheral wall portion 11. That is, the main body peripheral wall portion 11 is provided around the entire circumference outside the main body peripheral wall portion 11, but may be provided on a part of the entire circumference. The main body groove portion 12 is located between the main body peripheral wall portion 11 and the main body flange portion 13. The main body groove portion 12 is a downward annular protrusion that protrudes downward. The main body groove portion 12 is a U-shaped groove (side gutter) that opens upward. The main body groove portion 12 protrudes downward beyond the main body flange portion 13. The main body gutter portion 12 has a gutter inner surface portion 120 that is connected to the main body step portion and extends downward from the main body step portion, a gutter outer surface portion 122 that faces the outside of the gutter inner surface portion 120 and connects to the main body flange portion 13, and a gutter bottom surface portion 121 that connects the lower ends of the gutter inner surface portion 120 and the gutter outer surface portion 122 in the inward and outward directions. The gutter outer surface portion 122 extends downward from the main body flange portion 13. A gutter inclined surface 122a that is more outward toward the upper side may be provided at the upper end of the gutter outer surface portion 122. The height of the gutter bottom surface portion 121, that is, the amount of protrusion of the main body gutter portion 12 downward from the main body flange portion 13, is not constant but changes along the circumferential direction, and the height of the gutter bottom surface portion 121 is lower at each corner portion and higher at each side portion.

[0023] The legs 14 are provided in the main body groove 12 at the corners. The legs 14 form part of the main body groove 12. The legs 14 are provided at each of the four corners. The legs 14 are in contact with the container mounting surface 3 in the container main body 1. In the container main body 1, the legs 14 are located at the lowest position. The legs 14 are formed across two adjacent sides, i.e., the long side and the short side. Therefore, the legs 14 are L-shaped when viewed from the bottom (plan view). The legs 14 have an installation bottom surface 141 that contacts the container mounting surface 3, a leg inner surface 140 that extends upward from the inner edge of the installation bottom surface 141, and a leg outer surface 142 that extends upward from the outer edge of the installation bottom surface 141. The installation bottom surface portion 141 is a part of the groove bottom surface portion of the main body side groove portion 12, the leg inner surface portion 140 is a part of the side groove inner surface portion 120, and the leg outer surface portion 142 is a part of the side groove outer surface portion 122. The installation bottom surface portion 141 connects the lower ends of the leg inner surface portion 140 and the leg outer surface portion 142 in the inward and outward directions. The lower surface 141a of the installation bottom surface portion 141 abuts against the container mounting surface 3. The installation bottom surface portion 141 is located below the main body bottom surface portion 10. The leg inner surface portion 140 is mainly connected to the main body corner step portion 21, and its circumferential both ends are connected to the main body side step portion 20. The leg inner surface portion 140 extends downward from the outer edge portion of the main body corner step portion 21. The leg outer surface portion 142 is connected to the main body flange portion 13. A leg outer surface portion 142 extends downward from the inner edge of the main body flange portion 13 .

[0024] The leg 14 is provided with a body fitting portion 15 for maintaining the lid closed. The body fitting portion 15 is provided only on the leg 14 out of the entire circumference of the body side groove portion 12. The structure of the body fitting portion 15 may be various, and may be any of an internal fitting structure, an external fitting structure, and an internal and external fitting structure. In this embodiment, an internal fitting structure is adopted. The body fitting portion 15 is provided on the inside of the leg 14, that is, on at least one of the internal surface of the leg external surface portion 142 and the external surface of the leg internal surface portion 140. In this embodiment, the body fitting portion 15 is provided on the internal surface of the leg external surface portion 142 (the surface facing the leg internal surface portion 140 in the internal and external directions). The body fitting portion 15 is located below the body bottom surface portion 10. The body fitting portion 15 is adjacent to the upper side of the installation bottom surface portion 141. In detail, the main body fitting portion 15 is adjacent to the upper surface 141b of the installation bottom surface portion 141 and is connected to the upper surface 141b of the installation bottom surface portion 141. The shape of the main body fitting portion 15 may also be various. For example, the main body fitting portion 15 may have an inverse tapered shape that is inward toward the upper side. In this embodiment, the main body fitting portion 15 is a fitting recess that is recessed outward. The main body fitting portion 15 extends in a stripe-like manner in the circumferential direction. The main body fitting portion 15 is formed at the ends of two adjacent sides (long side portion and short side portion). The circumferential length of the main body fitting portion 15 is shorter than the circumferential length of the installation bottom surface portion 141. The end portion of the main body fitting portion 15 on the side center side is located closer to the corner portion than the end portion of the side center side of the installation bottom surface portion 141. The installation bottom surface portion 141 extends toward the side center side more than the main body fitting portion 15.

[0025] The height of the gutter bottom surface portion 121 increases from the leg portion 14 toward the center of the side. The body gutter portion 12 is provided with a shallow groove portion 16 that is locally shallower than both sides in the circumferential direction. The shallow groove portion 16 is provided on each side, and in this embodiment, two shallow groove portions 16 are provided on each side at intervals in the circumferential direction. The shallow groove portions 16 are provided on both sides in the circumferential direction of the leg portion 14. The gutter bottom surface portion 121 is shallowest and highest in the shallow groove portion 16. It gradually becomes higher from the leg portion 14 to the shallow groove portion 16. The shallow groove portion 16 has a shape that curves upward along the circumferential direction. In the section between the two shallow groove portions 16 on each side, the height of the gutter bottom surface portion 121 is approximately constant, lower than the shallow groove portion 16, but higher than the leg portion 14. The height of the gutter bottom surface portion 121 is lower over the entire periphery than a main body edging portion 131 of the main body flange portion 13 described below, and is also lower at the shallow groove portion 16 .

[0026] The main body flange portion 13 extends outward from the upper end of the gutter outer surface portion 122 of the main body gutter portion 12. The main body flange portion 13 is formed around the entire circumference. The shape of the main body flange portion 13 is arbitrary. In this embodiment, the main body flange portion 13 has a main body flange top surface portion 130 and a main body edging portion 131. The main body flange top surface portion 130 is the top portion of the main body flange portion 13 and is the uppermost portion of the main body flange portion 13. The main body flange top surface portion 130 is adjacent to the outside of the gutter outer surface portion 122 of the main body gutter portion 12 and extends outward from the upper end of the gutter outer surface portion 122. The main body flange top surface portion 130 has a so-called rounded shape and is curved upward along the inner and outer directions. The main body flange top surface portion 130 is lower than the peripheral wall top portion 111 of the main body peripheral wall portion 11 and lower than the main body bottom surface portion 10.

[0027] The body edging portion 131 constitutes the outer edge of the container body 1 and is the outermost portion of the container body 1. The body edging portion 131 extends substantially horizontally outward from the outer edge of the body flange top surface portion 130. As described above, the body edging portion 131 is higher than the side groove bottom surface portion 121 of the main body side groove portion 12.

[0028] It is preferable to form many very fine irregularities on the main body edging portion 131, which provides a reinforcing effect and prevents cuts to fingers. The irregularities are wavy when viewed enlarged from the front, and the direction in which the many peaks and valleys extend is the width direction (inward and outward direction). The irregularities may be formed by knurling, such as flat knurling or twill knurling, and are particularly preferably formed by twill knurling to prevent slipping.

[0029] <Cover 2> The lid body 2 has a shape in plan view corresponding to the container body 1, and in this embodiment, it is a rectangular shape in plan view, specifically, a rectangular shape. The lid body 2 includes a top surface portion 30, a lid side surface portion 31 provided on the outside of the top surface portion 30, a lid protrusion portion 32 provided on the outside of the lid side surface portion 31, and a lid flange portion 33 provided on the outside of the lid protrusion portion 32. The top surface portion 30 has a flat surface portion without unevenness such as ribs. In terms of visibility, it is preferable that the flat surface portion is a smooth surface. The flat surface portion is preferably a horizontal surface, but may be an inclined surface. The flat surface portion may be provided on the entire top surface portion 30. A non-illustrated anti-slip convex portion may be provided on the periphery of the top surface portion 30 to prevent the containers from shifting in the lateral direction when the containers in the closed state are stacked one on top of the other.

[0030] It is preferable that a streak rib 40 is provided at the boundary between the top surface portion 30 and the lid side surface portion 31. The boundary is the peripheral edge of the top surface portion 30 and the upper end portion of the lid side surface portion 31. The streak rib 40 extends in a streak shape along the boundary, i.e., along the circumferential direction. The streak rib 40 may be provided so as to go around the boundary. The streak rib 40 protrudes upward from the flat surface of the top surface portion 30, which is used as a reference surface.

[0031] The lid side portion 31 extends downward from the periphery of the top surface portion 30 while widening. At the corners of the lid side portion 31, a lid corner side portion 41 is provided, which widens downward from the top surface portion 30. The lid corner side portion 41 is an isosceles triangle shape with its upper end portion as the apex and its lower end portion as the base. Various ribs may be formed on the lid side portion 31. At the lower end of the lid side portion 31, a blocking prevention protrusion 42 protruding outward may be provided to prevent the so-called blocking phenomenon, in which the lid bodies 2 are tightly fitted together and cannot be removed when a large number of lid bodies 2 are stacked one on top of the other. The blocking prevention protrusion 42 is arranged at a different position for each lid body 2.

[0032] In addition, a lid step may be provided at the lower end of the lid side surface portion 31 so as to expand outward. The lid step preferably corresponds to the main body step, and preferably faces the upper side of the main body step in the closed state. The lid step is composed of a lid side step 50 corresponding to the main body side step 20 and a lid corner step 51 corresponding to the main body corner step 21. The lid side step 50 is provided at each side, and the lid corner step 51 is provided at each corner. The lid side step 50 extends in a stripe shape along the side, i.e., along the circumferential direction. The lid corner step 51 is provided one step lower than the lid side step 50. The lid corner side portion 41 is connected to the lid corner step 51.

[0033] The lid protrusion 32 protrudes downward. The lid protrusion 32 is a downward annular protrusion that protrudes downward. The lid protrusion 32 protrudes downward further than the lid flange 33. The lid protrusion 32 is formed around the entire circumference on the outside of the lid side surface 31, but may be provided on a part of the entire circumference. The lid protrusion 32 is connected to the lid step portion. The lid protrusion 32 corresponds to the main body groove 12. In the closed lid state, the main body groove 12 enters the inside of the lid protrusion 32.

[0034] The lid protrusion 32 has a lid protrusion inner surface 320 that is connected to the lid step and extends downward from the lid step, a lid protrusion outer surface 322 that faces the outside of the lid protrusion inner surface 320 and connects to the lid flange 33, and a lid protrusion bottom surface 321 that connects the lower ends of the lid protrusion inner surface 320 and the lid protrusion outer surface 322 in the inward and outward directions. The lid protrusion outer surface 322 extends downward from the lid flange 33. A protrusion inclined surface 322a that is more outward the higher it is may be provided at the upper end of the lid protrusion outer surface 322. The height of the lid protrusion bottom surface 321, i.e., the amount of downward protrusion of the lid protrusion 32 relative to the lid flange 33, is not constant but changes along the circumferential direction, and the height of the lid protrusion 32 is lower at each corner and higher at each side. The amount by which the lid protrusion 32 protrudes downward corresponds to the amount by which the lid protrusion 32 protrudes downward. In the closed lid state, the lid protrusion bottom surface 321 faces the upper side of the gutter bottom surface 121 of the main body gutter 12, the lid protrusion inner surface 320 faces the outside of the gutter inner surface 120 of the main body gutter 12, the lid protrusion outer surface 322 faces the inside of the gutter outer surface 122 of the main body gutter 12, and the lid protrusion inner surface 320 faces the outside of the gutter inner surface 120 of the main body gutter 12.

[0035] An entry protrusion 34 is provided on the lid protrusion 32 at the corner portion. The entry protrusion 34 constitutes a part of the lid protrusion 32. The entry protrusion 34 is provided at each of the four corner portions. The entry protrusion 34 is provided corresponding to the leg portion 14 of the container body 1. The entry protrusion 34 is formed across two adjacent sides, i.e., the long side and the short side. Therefore, the entry protrusion 34 is L-shaped when viewed from the bottom (plan view).

[0036] The entry protrusion 34 has an abutment tip 341 that abuts against the upper surface 141b of the installation bottom surface 141 of the leg 14 in the closed state, an entry inner surface 340 that extends upward from the inner edge of the abutment tip 341, and an entry outer surface 342 that extends upward from the outer edge of the abutment tip 341. The abutment tip 341 is a part of the lid ridge bottom surface 321 of the lid ridge portion 32, the entry inner surface 340 is a part of the lid ridge inner surface 320, and the entry outer surface 342 is a part of the lid ridge outer surface 322. The abutment tip 341 connects the lower ends of the lid ridge inner surface 320 and the lid ridge outer surface 322 in the inward and outward directions. The lower surface 341a of the abutment tip 341 abuts against the upper surface 141b of the installation bottom surface 141 in the closed state. The abutting tip 341 is located below the lid flange 33, and in particular below the lid edge 332 of the lid flange 33 described below. Therefore, the entry protrusion 34 protrudes downward from the lid edge 332. In the lid body 2, the abutting tip 341 of the entry protrusion 34 is located at the lowest side. The entry inner surface 340 is mainly connected to the lid corner step 51, and is connected to the lid side step 50 at both circumferential ends. The entry inner surface 340 extends downward from the outer edge of the lid corner step 51. The entry outer surface 342 is connected to the lid flange 33. The entry outer surface 342 extends downward from the inner edge of the lid flange 33.

[0037] The entrance protrusion 34 is provided with a lid fitting portion 35 for maintaining the lid in a closed state. The lid fitting portion 35 maintains the closed state by cooperating with the main body fitting portion 15. The lid fitting portion 35 is provided only on the entrance protrusion 34 among the entire circumference of the lid protrusion portion 32. The structure of the lid fitting portion 35 may be various, and may be any of an internal fitting structure, an external fitting structure, and an internal and external fitting structure, but in this embodiment, an internal fitting structure is adopted. The lid fitting portion 35 is provided on the outside of the entrance protrusion 34, that is, on at least one of the outer surface of the entrance outer surface portion 342 and the outer surface of the entrance inner surface portion 340. In this embodiment, the lid fitting portion 35 is provided on the outer surface of the entrance outer surface portion 342 corresponding to the main body fitting portion 15.

[0038] The lid fitting portion 35 is adjacent to the upper side of the contact tip portion 341. In detail, the lid fitting portion 35 is adjacent to the lower surface 341a of the contact tip portion 341 and is connected to the lower surface 341a of the contact tip portion 341. The shape of the lid fitting portion 35 may also be various. For example, the lid fitting portion 35 may have an inverse tapered shape that is inward toward the upper side. In this embodiment, the lid fitting portion 35 is a fitting protrusion that protrudes outward. In the closed state, the lid fitting portion 35 fits into and engages with the main body fitting portion 15. The lid fitting portion 35 extends in a streak shape in the circumferential direction. The lid fitting portion 35 is formed at the end of each of two adjacent sides (long side portion and short side portion). The circumferential length of the lid fitting portion 35 is shorter than the circumferential length of the contact tip portion 341. The end portion on the side center side of the lid fitting portion 35 is located closer to the corner portion than the end portion on the side center side of the contact tip portion 341. The contact tip portion 341 extends further toward the side center side than the lid fitting portion 35.

[0039] The height of the lid protrusion bottom surface portion 321 increases from the entry protrusion 34 toward the center of the side. The lid protrusion portion 32 is provided with small protrusions 36 that are locally higher than both sides in the circumferential direction. The small protrusions 36 are provided on each side, and in this embodiment, two small protrusions 36 are provided on each side at intervals in the circumferential direction. The small protrusions 36 correspond to the shallow groove portion 16 of the container body 1. The small protrusions 36 are provided on both sides in the circumferential direction of the entry protrusion 34. The lid protrusion bottom surface portion 321 is highest at the small protrusions 36. It gradually becomes higher from the entry protrusion 34 to the small protrusions 36. The small protrusions 36 are curved upward along the circumferential direction. The small protrusions 36 are higher than the lid edging portion 332 of the lid flange portion 33 described later. In the section between the two small protrusions 36 on each side, the height of the cover ridge bottom portion 321 is substantially constant and is lower than the small protrusions 36 but higher than the entry protrusion 34. The height of the cover ridge bottom portion 321 is lower than the main body edging portion 131 except for the small protrusions 36.

[0040] The lid flange portion 33 extends outward from the upper end of the lid ridge outer surface portion 322 of the lid ridge portion 32. The lid flange portion 33 is formed around the entire circumference. The shape of the lid flange portion 33 is arbitrary. In this embodiment, the lid flange portion 33 has a lid flange top surface portion 330, a skirt portion 331, and a lid edging portion 332. The lid flange top surface portion 330 is the top portion of the lid flange portion 33 and is the uppermost portion of the lid flange portion 33. The lid flange top surface portion 330 is adjacent to the outside of the lid ridge outer surface portion 322 of the lid ridge portion 32 and extends outward from the upper end of the lid ridge outer surface portion 322. The lid flange top surface portion 330 extends approximately horizontally in the inward and outward directions.

[0041] A reinforcing uneven portion 37 is formed on the lid flange top surface portion 330. The reinforcing uneven portion 37 is provided on each side portion except the corner portion, and is particularly provided around the center portion of the side. In this embodiment, the reinforcing uneven portion 37 is configured by forming a plurality of upward protrusions 37a protruding upward at intervals in the circumferential direction. The shape and number of the upward protrusions 37a are arbitrary. An example of the shape of the upward protrusions 37a is a parallelogram. Note that the reinforcing uneven portion 37 may be configured by a plurality of downward protrusions protruding downward instead of the upward protrusions 37a.

[0042] The skirt portion 331 extends downward from the outer edge of the lid flange top surface portion 330. The lid border portion 332 constitutes the outer edge of the lid body 2 and is the portion located on the outermost side of the lid body 2. The lid border portion 332 extends from the lower end of the skirt portion 331 toward the outside in a substantially horizontal manner. It is preferable to form a large number of extremely fine irregularities on the lid border portion 332, which provides a reinforcing effect and prevents finger cuts. The irregularities are wavy when viewed enlarged from the front, and the direction in which the numerous peaks and valleys extend is the width direction (inward and outward direction). In addition, the irregularities may be formed by knurling such as flat knurling or twill knurling, and it is particularly preferable to form them by twill knurling to prevent slipping. A lid gripping portion 43 may be provided at the corner portion of the lid border portion 332. Incidentally, the body border portion 131 of the container body 1 may also be provided with a body grip portion (not shown).

[0043] <Closed lid> In the closed state, the lid 2 covers the container body 1. Before closing the lid, food such as sashimi is placed on the body bottom surface 10 of the container body 1 and served. The body bottom surface 10 and body peripheral wall 11 of the container body 1 and the top surface 30 and lid side surface 31 of the lid 2 form a storage space for storing food. The lower part of the lid side surface 31 is located outside the body peripheral wall 11. The lid step portion faces the upper side of the body step portion. The lid protrusion 32 fits inside the body side groove portion 12. The entry protrusion 34 fits inside the leg portion 14. The lower surface 341a of the abutting tip portion 341 of the entry protrusion 34 abuts against the upper surface 141b of the installation bottom surface portion 141 of the leg portion 14. The lid fitting portion 35 fits inside the body fitting portion 15. The lid flange top surface portion 330 faces the upper side of the main body flange top surface portion 130. The skirt portion 331 surrounds the outside of the main body edging portion 131. The lid edging portion 332 is located below the main body edging portion 131.

[0044] As described above, in the container according to the present embodiment, when the lid body 2 is placed on the container body 1, the entry protrusion 34 of the lid body 2 enters the inside of the leg 14 of the container body 1, and then the lower surface 341a of the abutting tip 341 of the entry protrusion 34 abuts against the upper surface 141b of the installation bottom surface 141 of the leg 14. The lower surface 341a of the abutting tip 341 of the lid body 2 abuts against the upper surface 141b of the installation bottom surface 141 of the container body 1, so that the vertical position of the lid body 2 relative to the container body 1 is determined, and further descent of the lid body 2 is prevented during the lid closing operation. In addition, when the lower surface 341a of the abutting tip 341 of the lid body 2 abuts against the upper surface 141b of the installation bottom surface 141 of the container body 1, the lid fitting portion 35 fits into the body fitting portion 15.

[0045] During the lid closing operation, the force pressing the lid body 2 downward is transmitted from the abutting tip 341 of the entry protrusion 34 of the lid body 2 to the installation bottom surface 141 of the leg 14 of the container body 1, and then from the installation bottom surface 141 of the container body 1 to the container mounting surface 3. Therefore, even if an operator strongly presses the lid body 2 downward, the force is firmly received by the installation bottom surface 141 of the leg 14 of the container body 1. Therefore, the entry protrusion 34 of the lid body 2 can be easily entered into the leg 14 of the container body 1, and the lid fitting portion 35 of the entry protrusion 34 can be easily and reliably fitted into the body fitting portion 15 of the leg 14, and the fitting structure of the body fitting portion 15 and the lid fitting portion 35 can reliably maintain the closed state. Since a main body fitting portion 15 is provided on the leg portion 14 and a lid fitting portion 35 is provided on the entry protrusion 34, the lid fitting portion 35 can be securely fitted into the main body fitting portion 15 during the lid closing operation, compared to a configuration in which the main body fitting portion 15 is provided at a position above the leg portion 14 and the lid fitting portion 35 is provided at a position above the entry protrusion 34.

[0046] In addition, since the lower surface 341a of the contact tip 341 of the entry protrusion 34 of the lid body 2 contacts the upper surface 141b of the installation bottom surface 141 of the leg 14 of the container body 1, the leg 14 of the container body 1 is not easily deformed during the lid closing operation, and crushing of the leg 14 of the container body 1 can be prevented, and the lid fitting part 35 can be reliably fitted into the body fitting part 15. Furthermore, since the leg 14 has a double structure together with the entry protrusion 34 and the contact tip 341 contacts the installation bottom surface 141, the strength of the leg 14 can be greatly improved. Therefore, even if food is placed on the body bottom surface 10, the leg 14 is not easily deformed, and even if the sheet of the container body 1 is made thin, deformation of the leg 14 can be prevented, and the container can be easily stabilized. Furthermore, when containers containing food with their lids closed are stacked one on top of the other, even if the weight of the upper container acts on the lower container, the double-structured legs 14 can firmly support the containers, stabilizing the stacked state of the containers. Even in such a stacked state, the legs 14 are not easily deformed, so the lid fitting part 35 is not easily disengaged from the body fitting part 15 provided on the legs 14, preventing the lids from opening accidentally.

[0047] In particular, since the main body fitting portion 15 is adjacent to the upper side of the installation bottom surface portion 141 and the lid fitting portion 35 is adjacent to the upper side of the abutting tip portion 341, the fitted state is more stable than a configuration in which the main body fitting portion 15 and the lid fitting portion 35 are far above the installation bottom surface portion 141 and the abutting tip portion 341, respectively. Moreover, since the lid fitting portion 35 fits into the main body fitting portion 15 in the final stage when the entry protrusion 34 is entered into the leg portion 14, the lid closing operation can be easily performed and the lid fitting portion 35 can be reliably fitted into the main body fitting portion 15. Furthermore, since the lid fitting portion 35 fits into the main body fitting portion 15 just above the abutting tip portion 341 overlapping the upper side of the installation bottom surface portion 141 to form a double structure, the fitted state is less likely to be released inadvertently, and inadvertent opening of the lid can be prevented.

[0048] In addition, since the leg 14 and the entrance protrusion 34 are provided at the corner portion, the lid fitting portion 35 can be firmly fitted to the main body fitting portion 15 at the corner portion to maintain the closed state. Moreover, since the leg 14 and the entrance protrusion 34 are formed in an L-shape in a plan view, the strength of the leg 14 and the entrance protrusion 34 is high, and the fitting strength can be easily improved. The main body fitting portion 15 and the lid fitting portion 35 are not provided at the center of the side. However, since the skirt portion 331 is provided on the lid flange portion 33, the lifting of the lid flange portion 33 at the center of the side can be effectively prevented. Furthermore, since the reinforcing uneven portion 37 is provided on the lid flange top surface portion 330 at the center of the side, the lifting of the lid flange portion 33 can be more effectively prevented in combination with the skirt portion 331.

[0049] On the other hand, since the circumferential length of the main body fitting portion 15 is shorter than the circumferential length of the installation bottom surface portion 141, and the circumferential length of the lid fitting portion 35 is shorter than the circumferential length of the abutment tip portion 341, even if the leg portion 14 and the entrance protrusion 34 are deep drawn, the die can be easily removed during molding, ensuring good formability. Furthermore, since the shallow groove portions 16 are provided on both the left and right sides of the leg portion 14, and the small convex portions 36 are provided on both the left and right sides of the entrance protrusion 34, good formability can be ensured even if the leg portion 14 and the entrance protrusion 34 are deep drawn.

[0050] In addition, since the body corner step 21 is provided, the leg 14 can be easily molded downward. The container body 1 is provided with the body peripheral wall 11, which protrudes upward, and since the body corner step 21 is provided between the body peripheral wall 11 and the leg 14, the downward protruding shape of the leg 14 and the upward protruding shape of the body peripheral wall 11 can be easily molded. Similarly, since the lid corner step 51 is provided, the entry protrusion 34 can be easily molded, and since the lid corner step 51 is provided between the lid side surface 31 and the entry protrusion 34, the downward protruding shape of the entry protrusion 34 and the upward protruding shapes of the lid side surface 31 and the top surface 30 can be easily molded. Furthermore, since the body corner step 21 is provided corresponding to the inside of the body fitting portion 15, the mold can be easily removed even if the body fitting portion 15 is provided at the innermost position of the leg 14. Similarly, since the lid corner step portion 51 is provided corresponding to the inside of the lid fitting portion 35, the mold can be easily removed even if the lid fitting portion 35 is provided at the lower end of the entry protrusion 34.

[0051] Since the corner reinforcing protrusion 22 connects the main body corner step portion 21 and the main body peripheral wall portion 11, the corner portion can be effectively reinforced, the fitting state can be stabilized, and the closed state can be maintained. [Explanation of symbols]

[0052] 1 Container body 2 Lid 3 Container placement surface 10 Bottom of the main unit 11 Main body peripheral wall 110 Inner wall 111 Top of surrounding wall 112 Exterior wall 12 Main body gutter section 120 Gutter inner surface 121 Gutter bottom part 122 Outer surface of gutter 122a Gutter slope 13 Body flange 130 Top surface of main body flange 131 Body edge 14 Legs 140 Inner surface of leg 141 Installation bottom part 141a Bottom side 141b Top surface 142 Leg outer part 15 Body fitting part 16 Shallow groove 20. Stepped portion of main body side 21 Main body corner step (main body step) 22 Corner reinforcement protrusion 30 Top section 31 Lid side part 32 Lid protrusion 320 Inner surface of lid protrusion 321 Lid ridge bottom part 322 Lid ridge outer surface part 322a Projection slope surface 33 Lid flange 330 Top surface of lid flange 331 Skirt Club 332 Lid edge 34 Approach protrusion 340 Inner surface of approach 341 Contact tip 341a Bottom side 342 External approach part 35 Lid fitting part 36 Small protrusion 37 Reinforcement uneven part 37a Upward convex part 40 Rib 41 Lid corner side 42 Anti-blocking protrusion 43 Lid knob 50 Lid edge step 51 Lid corner step

Claims

1. A packaging container having a container body and a lid body made of a synthetic resin sheet, The container body includes a body bottom portion on which an object to be contained is placed, and legs protruding downward from the body bottom portion, The leg portion has a bottom installation surface portion whose lower surface abuts against a container placement surface on which the container body is placed, and a body fitting portion for maintaining the lid in a closed state, The cover includes an insertion protrusion that protrudes downward and enters the inside of the leg, The entry protrusion has a contact tip portion whose lower surface abuts against the upper surface of the installation bottom portion, and a lid fitting portion that fits into the main body fitting portion to maintain the lid in a closed state.

2. The length of the installation bottom surface portion in the container circumferential direction is longer than the length of the main body fitting portion in the container circumferential direction, 2. The packaging container according to claim 1, wherein the length of the contact tip in the circumferential direction of the container is longer than the length of the lid fitting portion in the circumferential direction of the container.

3. The main body fitting portion is adjacent to and above the installation bottom surface portion, 3. The packaging container according to claim 1, wherein the lid fitting portion is adjacent to and above the abutting tip portion.

4. The container has a rectangular shape in a plan view, The legs and the entry protrusions are provided at the corners, The lid body has a lid flange portion on the outer side of the container than the entry protrusion, The lid flange portion has a lid flange top surface portion and a skirt portion extending downward from the lid flange top surface portion, 3. The packaging container according to claim 1, wherein a reinforcing uneven portion is provided in the center of the side of the top surface of the lid flange.

5. The container body includes a main body peripheral wall portion provided around the main body bottom surface portion, and a main body flange portion provided on the outer side of the main body peripheral wall portion, The leg portion is located between the main body peripheral wall portion and the main body flange portion, The main body peripheral wall portion has an inner wall portion rising from the bottom surface of the main body, a peripheral wall apex portion provided at an upper end portion of the main body peripheral wall portion, and an outer wall portion extending from the peripheral wall apex portion to the outside and downward of the container, 3. The packaging container according to claim 1, further comprising a body step portion between the legs and the outer wall portion, the body step portion being higher than the installation bottom surface portion and lower than the top of the peripheral wall, the body step portion connecting the legs and the outer wall portion.

6. 6. The packaging container according to claim 5, wherein the body step portion is provided corresponding to an inner side of the container at least in a section of the entire circumferential length of the leg portion where the body fitting portion is provided.

Images