Container for packaging

Abstract

To provide a packaging container in which a lid body is less likely to come off from a container body unexpectedly, and in which the lid body can be easily opened from the container body.SOLUTION: A packaging container 300 includes a lid body 100 and a container body 200 having fitting projected and recessed parts 340 which are fitted with each other. Opening start positions X where the lid body 100 and the container body 200 are started to be opened and the fitting projected and recessed parts 340 are arranged along an edge part 301 of the lid body 100 and the container body 200, and in each of the fitting projected and recessed parts 340, on the side facing the opening start position X, a weak fitting part 345 in which fitting strength is weak is provided.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a packaging container including a lid body and a container body.

Background Art

[0002] Conventionally, solids such as muffins and bread sold in retail stores such as supermarkets are housed in a packaging container including a lid body and a container body. This packaging container is provided with button-type fitting uneven portions so that the lid body does not accidentally come off from the container body during transportation, storage, etc., and the user can easily remove the lid body from the container body. However, due to an impact from the side of the packaging container or stress when the packaging container is lifted, the button-type fitting uneven portions are deformed, so there is a risk that the lid body may accidentally come off from the container body. Therefore, by increasing the fitting force of the button-type fitting uneven portions, it becomes difficult for the lid body to come off from the container body, but on the other hand, there is a problem that it is difficult to open the lid body from the container body.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, in view of the above problems, the present invention provides a packaging container in which the lid body is difficult to accidentally come off from the container body and the lid body is easy to open from the container body.

Means for Solving the Problems

[0004] In order to solve the above problems, a packaging container according to claim 1 of the present invention is a packaging container including a lid body and a container body, which have fitting uneven portions that fit with each other, wherein an opening start position at which the lid body and the container body start to be opened and the fitting uneven portions are arranged along the edge portions of the lid body and the container body, and in the fitting uneven portions, a weak fitting portion having a weak fitting strength is provided on the side facing the opening start position.

[0005] According to the above characteristics, the force W applied during opening is transmitted to the weak fitting portion on the side facing the opening start position. Therefore, the fitting of the fitting uneven portions can be easily removed, and it is easy to open the lid body from the container body. On the other hand, even if an impact is applied to the edge portion by an external force from the side, the fitting is difficult to come off, and it is possible to prevent the lid body from accidentally coming off from the container body.

[0006] In order to solve the above problems, the packaging container according to claim 1 of the present invention is provided with a pair of strong fitting portions having a strong fitting strength at locations other than the locations where the weak fitting portions of the fitting uneven portions are provided. One of the pair of strong fitting portions is provided on the side facing the edge portion, and the other of the pair of strong fitting portions is provided so as to face one of the strong fitting portions.

[0007] According to the above characteristics, by providing a pair of strong fitting portions, the fitting force is increased, and it is possible to prevent the lid body from accidentally opening. In addition, by providing strong fitting portions at locations other than the location where the weak fitting portion is provided, that is, on the side other than the side facing the opening start position, the ease of opening remains unchanged. By providing one of the pair of strong fitting portions on the side facing the edge portion, it is possible to prevent the lid body from accidentally coming off from the container body even if an impact is applied to the edge portion by an external force from the side.

[0008] In order to solve the above problems, the packaging container according to claim 2 of the present invention is The lid body The top surface, side surface, and flange portion are has , The container body The bottom surface, side surface, and flange portion are has, and the fitting uneven portion The flange portion of the lid body and the flange portion of the container body is provided on On the side surface, bottom surface, or top surface located above and below the fitting uneven portion, strain prevention means is provided.

[0009] According to the above characteristics, the strain prevention means suppresses the strain around the fitting uneven portion due to an impact from the side or stress when lifting the packaging container, and prevents the fitting of the fitting uneven portion from coming off and the lid body from accidentally opening.

[0010] In order to solve the above problems, The present invention The packaging container according to [relevant content] is a packaging container including a lid body and a container body having fitting uneven portions that fit into each other and a flange portion, and an inner contact portion that contacts the inside of the other flange portion is provided on a part or all of one flange portion of the lid body or the container body. It is characterized by this.

[0011] According to the above characteristics, when the inner contact portion contacts the inside of the flange portion, the contact portion is in a state where it is lightly fitted, and while maintaining the ease of opening, the lid body is prevented from accidentally coming off the container body.

Effect of the Invention

[0012] As described above, the packaging container of the present invention makes it difficult for the lid body to accidentally come off the container body and makes it easy to open the lid body from the container body.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Explanation of Reference Numerals

[0014] 100 Lid 200 Container body 300 Packaging container 301 Edge 340 Fitting uneven portion 345 Weak fitting portion X Opening start position

Embodiments for Carrying Out the Invention

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

[0016] First, FIGS. 1 and 2 show the lid 100 of the packaging container 300 of the present invention. Note that FIG. 1(a) is a plan view of the lid 100, FIG. 1(b) is a side view of the lid 100, FIG. 1(c) is an end view taken along line A-A, FIG. 2(a) is a plan view of the lid 100, which is an enlarged plan view around the corner portion, FIG. 2(b) is a side view of the lid 100, which is an enlarged side view around the corner portion, and FIG. 2(c) is an end view taken along line B-B.

[0017] As shown in FIG. 1, the lid 100 has a shallow dish shape that opens downward and is substantially rectangular in plan view, and includes a flat top surface 110, a side surface 120 that continuously extends downward from an edge 111 of the top surface 110, and a flat flange portion 130 that extends laterally from the lower end of the side surface 120. Further, a skirt portion 131 that hangs downward is provided outside the flange portion 130, and a flange portion 132 is provided so as to extend outward from the lower end of the skirt portion 131. The side surface 120 and the flange portion 130 are provided continuously or intermittently over the entire circumference in the circumferential direction of the lid 100.

[0018] Further, a displacement prevention convex portion 112 that protrudes upward from the top surface 110 is formed at the edge 111 of the top surface 110, and the legs of the bottom surface of the container body described later can be arranged outside the displacement prevention convex portion 112. Therefore, when the packaging containers 300 are stacked, the legs of the bottom surface of the container body of the packaging container 300 stacked on top surround the displacement prevention convex portion 112 of the lid 100 of the lower packaging container 300, so that the upper packaging container 300 does not shift and fall, and can be stably stacked.

[0019] Further, a fitting convex portion 140 is provided on the flange portion 130. Two of these fitting convex portions 140 are arranged along the edge 101 on the long side of the lid 100. Further, a reinforcing rib 113 that linearly extends along the edge 111 is formed at the edge 111 of the top surface 110 adjacent to the fitting convex portion 140. When the packaging containers 300 are stacked, a load is applied to the side surface 120 and the fitting convex portion 140 from the edge 111 of the top surface 110, preventing the fitting convex portion 140 from deforming. The reinforcing rib 113 also prevents the fitting convex portion 140 from deforming due to an impact from the side or stress when the packaging container 300 is lifted.

[0020] Further, an inner contact portion 150 is provided on the flange portion 130. One inner contact portion 150 is disposed substantially at the center of each edge portion 102 on the short side of the lid body 100. As shown in FIG. 1(c), the inner contact portion 150 protrudes downward from the flange portion 130 and is configured to contact the inside of the flange portion of the container body 200 when the lid body 100 is fitted to the container body 200. Further, a protrusion 151 that protrudes downward is provided at a position on the flange portion 130 that is opposite to the inner contact portion 150.

[0021] An inner contact portion 160 is also provided at the corner portion 103 between the long side edge portion 101 and the short side edge portion 102 of the lid body 100. As shown in FIG. 2(c), the inner contact portion 160 protrudes downward from the flange portion 130 and is configured to contact the inside of the flange portion of the container body 200 when the lid body 100 is fitted to the container body 200. Further, a convex fitting portion 170 that protrudes inward from the skirt portion 131 of the flange portion 130 is provided at the corner portion 103. This fitting portion 170 extends from the corner portion 103 toward the long side edge portion 101 and from the corner portion 103 toward the short side edge portion 102. And as shown in FIG. 1(a), the fitting portion 170 is provided at each corner portion 103 of the four corners of the lid body 100.

[0022] Also, as shown in FIG. 2, a part of the fitting portion 170 is disposed so as to face the inner contact portion 160. Further, a grip portion 180 is formed at the front corner portion 103 so as to extend outward from the flange portion 130. And as shown in FIG. 2(a), at the corner portion 103, the inner contact portion 160, a part of the fitting portion 170, and the grip portion 180 are arranged linearly in a plan view.

[0023] On the side surface 120 of the lid body 100, a plurality of reinforcing ribs 121 extending linearly in the vertical direction are provided. The upper end of the reinforcing rib 121 extends to the top surface 110, and the lower end of the reinforcing rib 121 extends to the flange portion 130, reinforcing to prevent the side surface 120 from deforming due to an external force. Further, the reinforcing rib 121 is also provided on the side surface 120 adjacent to the fitting convex portion 140, preventing the fitting convex portion 140 from deforming due to an external force from above or sideward and the stress when lifting the packaging container 300.

[0024] Also, at the edge portion 101 on the other long side of the lid body 100, the fitting convex portion 140 is not provided on the flange portion 130 and is connected to the container body 200 described later by the hinge portion 104. Therefore, the lid body 100 is connected to the container body 200 by the hinge portion 104 so as to be openable and closable. Note that, in order to prevent the fitting convex portion 140 from deforming, the lid body 100 is provided with the reinforcing rib 121 and the reinforcing rib 113 as anti-distortion means on the side surface 120 and the top surface 110 located above the fitting convex portion 140, but it is not limited thereto, and only one of the reinforcing rib 121 or the reinforcing rib 113 may be provided. Further, the lid body 100 may be provided with ribs of an arbitrary shape as anti-distortion means at an arbitrary position located above the fitting convex portion 140. Also, the anti-distortion means suppresses the distortion around the fitting convex portion 140 and prevents the lid body 100 from accidentally opening.

[0025] Next, with reference to FIG. 3, the configuration of the fitting convex portion 140 will be described in detail. Note that FIG. 3(a) is an enlarged plan view around the fitting convex portion 140, FIG. 3(b) is a C-C end view, and FIG. 3(c) is a D-D end view.

[0026] As shown in FIG. 3, the fitting convex portion 140 is configured to protrude downward from the flange portion 130 and has a substantially cylindrical shape with a hollow interior. Specifically, the fitting convex portion 140 includes a side wall 142 that surrounds the convex portion 141 protruding downward and extends in a circumferential direction for one turn, and a flat tip 143. Further, a convex strong fitting portion 144 protruding outward is provided on a part of the side wall 142. Since the strong fitting portion 144 protrudes outward, it can be strongly fitted to the inner surface of the fitting concave portion 240 of the container body 200 described later. On the other hand, in the side wall 142 of the fitting convex portion 140, the portion where the strong fitting portion 144 is not provided is weakly fitted to the inner surface of the fitting concave portion 240 of the container body 200 described later as compared with the strong fitting portion 144. Therefore, the portion where the strong fitting portion 144 is not provided becomes a weak fitting portion 145 having a weak fitting strength with the fitting concave portion 240 of the container body 200.

[0027] Further, the fitting convex portion 140 is arranged along the edge portion 101 of the lid body 100. As will be described later, when the lid body 100 is attached to the container body 200, the edge portion 101 of the lid body 100 abuts against the edge portion 201 of the container body 200 and is closed, so that dust or the like does not enter from between the edge portions of the lid body 100 and the container body 200. When the lid body 100 is removed from the container body 200, the lid body 100 is lifted and opened by pinching the grip portion 180 of the lid body 100 with a finger. Therefore, the edge portion 101 around the grip portion 180 becomes the opening start position X where the lid body 100 starts to be opened from the container body 200. In this way, the fitting convex portion 140 and the opening start position X are arranged along the front edge portion 101. Note that the opening start position X is the edge portion 101 around the grip portion 180, but is not limited thereto. Also, when the user applies force to remove the lid body 100, the periphery of the edge portion 101 where the lid body 100 starts to be opened from the container body 200 becomes the opening start position X, even outside the periphery of the grip portion 180.

[0028] Further, as shown in FIG. 3(a), the weak fitting portion 145 of the fitting convex portion 140 is disposed on the side facing the unsealing start position X and the edge portion 101. The side facing the unsealing start position X means the side where the unsealing start position X that is closest to the fitting convex portion 140 exists when the fitting convex portion 140 is divided into left and right by a line passing through the center of the fitting convex portion 140 in the front-rear direction in a plan view as shown in FIG. 3(a) (refer to the right side of the left-right dividing line P1 in FIG. 3(a)). Note that the unsealing start position X that is closest to the fitting convex portion 140 means that, for example, as shown in FIGS. 1 and 3(a), when the lid body 100 includes a plurality of knob portions 180, for the right fitting convex portion 140, the unsealing start position X closest in distance is the unsealing start position X around the right knob portion 180, and for the left fitting convex portion 140, the unsealing start position X closest in distance is the unsealing start position X around the left knob portion 180.

[0029] Further, the side facing the edge portion 101 means the side where the edge portion 101 that is closest to the fitting convex portion 140 exists when the fitting convex portion 140 is divided into front and rear by a line passing through the center of the fitting convex portion 140 in the left-right direction in a plan view as shown in FIG. 3(a) (refer to the front side of the front-rear dividing line P2 in FIG. 3(a)). Note that the edge portion closest to the fitting convex portion 140 means that, as shown in FIGS. 1 and 3(a), when the lid body 100 includes a plurality of edge portions, the edge portion 101 closest in distance to the fitting convex portion 140 is the front edge portion 101.

[0030] Thus, the weak fitting portion 145 of the fitting convex portion 140 is disposed on the side facing the unsealing start position X and the edge portion 101, and the side facing the unsealing start position X and the edge portion 101 is the region Y indicated by the diagonal lines shown in FIG. 3(a). Further, since the lid body 100 and the container body 200 are fitted by the fitting convex portion 140, when the lid body 100 is lifted and unsealed by pinching the knob portion 180 of the lid body 100 with a finger, the unsealing site moves from the knob portion 180 toward the fitting convex portion 140 (refer to the arrow Z in FIG. 3(a)) along the edge portion 101. Therefore, the weak fitting portion 145 of the fitting convex portion 140 is disposed so as to face the unsealing site that moves from the knob portion 180 toward the fitting convex portion 140. Further, the weak fitting portion 145 is paired with the weak fitting portion 145' provided at the opposing position.

[0031] On the one hand, as shown in Fig. 3(a), the strong fitting portion 144 is disposed on the side facing the edge portion 101 except at the location where the weak fitting portion 145 is provided. And the strong fitting portion 144 is paired with the strong fitting portion 144' provided at the opposing position. By providing such a pair of strong fitting portions 144, the fitting force is increased to prevent the lid body 100 from accidentally opening. Also, by providing the strong fitting portion 144 at a location other than the location where the weak fitting portion 145 is provided, that is, on the side other than the side facing the opening start position X, the ease of opening remains unchanged. Since one of the pair of strong fitting portions (144, 144') is provided on the side facing the edge portion 101, it is possible to prevent the lid body 100 from accidentally coming off the container body 200 even when an impact is applied to the edge portion 101 by an external force from the side. Incidentally, the fitting convex portion 140 is surrounded by a substantially C-shaped reinforcing rib 135. This reinforcing rib 135 protrudes upward from the flange portion 130 and is open on the side of the edge portion 101. Therefore, it is possible to prevent the fitting convex portion 140 from being unnecessarily deformed by an external force, and since the side of the edge portion 101 is open, the force at the time of opening is easily transmitted to the fitting convex portion 140, making it easy to remove the fitting convex portion 140.

[0032] Note that the strong fitting portion 144 strengthens the fitting force by means of a convex shape, and the weak fitting portion 145 weakens the fitting force by not providing a convex shape as compared with the strong fitting portion 144, but it is not limited thereto. As long as the strong fitting portion 144 has a stronger fitting force than the weak fitting portion 145 and the weak fitting portion 145 has a weaker fitting force than the strong fitting portion 144, any configuration can be adopted. For example, the weak fitting portion 145 may weaken the fitting force by means of a concave shape, and the strong fitting portion 144 may strengthen the fitting force by not providing a concave shape. Also, the thickness of the weak fitting portion 145 may be made thinner to weaken the fitting force, and the thickness of the strong fitting portion 144 may be made thicker to strengthen the fitting force. Further, the fitting convex portion 140 includes a pair of strong fitting portions and a pair of weak fitting portions, but it is not limited thereto, and it may include only one strong fitting portion 144 and one weak fitting portion 145.

[0033] Next, FIGS. 4 and 5 show the container body 200 of the packaging container 300 of the present invention. Note that FIG. 4(a) is a plan view of the container body 200, FIG. 4(b) is a side view of the container body 200, FIG. 4(c) is an end view taken along line E-E, FIG. 5(a) is a plan view of the container body 200 with the periphery of the corner portion enlarged, and FIG. 5(b) is an end view taken along line F-F.

[0034] As shown in FIG. 4, the container body 200 has a shallow dish shape that opens upward and is substantially rectangular in plan view, and includes a flat bottom surface 210, side surfaces 220 that continuously extend upward from the edge portion 211 of the bottom surface 210, and a flat flange portion 230 that extends laterally from the upper end of the side surfaces 220. Further, a skirt portion 231 that hangs downward is provided outside the flange portion 230, and a flange portion 232 is provided so as to extend outward from the lower end of the skirt portion 231. Further, legs 212 that protrude downward from the bottom surface 210 are formed at the edge portion 211 of the bottom surface 210, and the displacement prevention protrusions 112 on the top surface 110 of the lid body 100 can be disposed inside the legs 212. The side surfaces 220 and the flange portion 230 are provided continuously or intermittently over the entire circumference in the circumferential direction of the container body 200.

[0035] Further, fitting recesses 240 are provided in the flange portion 230. Two of these fitting recesses 240 are arranged along the edge portion 201 on the long side of the container body 200. Further, an outer abutting portion 250 is provided in the flange portion 230. One of these outer abutting portions 250 is arranged substantially at the center of each edge portion 202 on the short side of the container body 200. As shown in FIG. 4(c), the outer abutting portion 250 protrudes inward of the flange portion 230 and is configured such that the inner abutting portion 150 of the lid body 100 abuts when the lid body 100 is fitted to the container body 200. Further, a recessed portion 251 that is recessed downward is provided in the flange portion 230 at a position opposite to the outer abutting portion 250, and the protrusion 151 of the lid body 100 can be placed on the recessed portion 251.

[0036] In addition, an outer abutting portion 260 is also provided at a corner portion 203 between the long-side edge portion 201 and the short-side edge portion 202 of the container body 200. As shown in FIG. 5(b), the outer abutting portion 260 projects inward of the flange portion 230 and is configured such that the inner abutting portion 160 of the lid body 100 abuts thereagainst when the lid body 100 is fitted to the container body 200. Further, a concave fitting portion 270 that is recessed inward from the skirt portion 231 of the flange portion 230 is provided at the corner portion 203. The fitting portion 270 extends from the corner portion 203 toward the long-side edge portion 201 and from the corner portion 203 toward the short-side edge portion 202. As shown in FIG. 4(a), the fitting portion 270 is provided at each of the four corner portions 203 of the container body 200.

[0037] Also, as shown in FIG. 5, a part of the fitting portion 270 is arranged to face the outer abutting portion 260. Further, a grip portion 280 is formed at the corner portion 203 so as to extend outward of the flange portion 230. As shown in FIG. 5(a), at the corner portion 203, the outer abutting portion 260, a part of the fitting portion 270, and the grip portion 280 are arranged linearly in a plan view.

[0038] Note that reinforcing ribs 221 extending linearly in the vertical direction are provided on the side surface 220 of the container body 200. The lower end of the reinforcing rib 221 extends to the bottom surface 210, and the upper end of the reinforcing rib 221 extends to the flange portion 230, thereby reinforcing the side surface 220 so as not to be deformed by an external force. Further, reinforcing ribs 221 are also provided on the side surface 220 adjacent to the fitting recess 240, preventing the fitting recess 240 from being deformed by an external force from above or sideward and the stress when the packaging container 300 is lifted. Also, at the other long-side edge portion 201 of the container body 200, no fitting recess 240 is provided in the flange portion 230, and the lid body 100 is connected by the hinge portion 104. Therefore, the lid body 100 is connected to the container body 200 by the hinge portion 104 so as to be openable and closable.

[0039] Next, with reference to FIG. 6, the configuration around the fitting recess 240 will be described in detail. Note that FIG. 6(a) is an enlarged plan view of the periphery of the fitting recess 240, FIG. 6(b) is an end view taken along line G-G, and FIG. 6(c) is an end view taken along line H-H.

[0040] As shown in FIG. 6, the fitting recess 240 is configured to be recessed downward from the flange portion 230 and has a substantially circular hole shape. Specifically, the fitting recess 240 includes a side wall 242 that surrounds the recess 241 in a circumferential direction and a flat bottom wall 243. Further, a convex strong fitting portion 244 that protrudes inward is provided on a part of the side wall 242. Since this strong fitting portion 244 protrudes inward, it can strongly fit into the fitting convex portion 140 of the lid body 100. On the other hand, at the location on the side wall 242 of the fitting recess 240 where the strong fitting portion 244 is not provided, it fits weakly into the fitting convex portion 140 of the lid body 100 compared to the strong fitting portion 244. Therefore, the location where the strong fitting portion 244 is not provided becomes a weak fitting portion 245 with a weak fitting strength with the fitting convex portion 140 of the lid body 100.

[0041] Also, the fitting recess 240 is arranged along the edge portion 201 of the container body 200. And the fitting recess 240 can be fitted with the fitting convex portion 140 of the lid body 100. When the lid body 100 is fitted to the container body 200, the edge portion 101 of the lid body 100 abuts against the edge portion 201 of the container body 200 and is closed, so that dust or the like does not enter from between the edge portions of the lid body 100 and the container body 200. When removing the lid body 100 from the container body 200, since the lid body 100 is lifted and opened by pinching the grip portion 180 of the lid body 100 or the grip portion 280 of the container body 200 with a finger, the edge portion 201 around the grip portion 280 becomes the opening start position X where the lid body 100 starts to be opened from the container body 200. Thus, the fitting recess 240 and the opening start position X are arranged along the front edge portion 201.

[0042] Further, as shown in Fig. 6(a), the weak fitting portion 245 of the fitting recess 240 is disposed on the side facing the opening start position X and the edge portion 201. The side facing the opening start position X means the side where the opening start position X closest to the fitting recess 240 exists when the fitting recess 240 is divided into left and right by a line passing through the center of the fitting recess 240 in the front-rear direction in a plan view as shown in Fig. 6(a) (refer to the right side of the left-right dividing line P1 in Fig. 6(a)). The opening start position X closest to the fitting recess 240 means that, for example, as shown in Figs. 4 and 6(a), when the container body 200 is provided with a plurality of gripping portions 280, the opening start position X closest to the right fitting recess 240 is the opening start position X around the right gripping portion 280, and the opening start position X closest to the left fitting recess 240 is the opening start position X around the left gripping portion 280.

[0043] Further, the side facing the edge portion 201 means the side where the edge portion 201 closest to the fitting recess 240 exists when the fitting recess 240 is divided into front and rear by a line passing through the center of the fitting recess 240 in the left-right direction in a plan view as shown in Fig. 6(a) (refer to the front side of the front-rear dividing line P2 in Fig. 6(a)). The edge portion closest to the fitting recess 240 means that, as shown in Figs. 4 and 6(a), when the container body 200 is provided with a plurality of edge portions, the edge portion 201 closest to the fitting recess 240 is the front edge portion 201.

[0044] Thus, the weak fitting portion 245 of the fitting recess 240 is disposed on the side facing the opening start position X and the edge portion 201, and the side facing the opening start position X and the edge portion 201 is the region Y indicated by the oblique lines shown in Fig. 6(a). Further, since the lid body 100 and the container body 200 are fitted by the fitting recess 240, when the lid body 100 is lifted and opened by pinching the gripping portion 280 of the container body 200 with a finger, the opening portion moves from the gripping portion 280 toward the fitting recess 240 (refer to the arrow Z in Fig. 6(a)) along the edge portion 201. Therefore, the weak fitting portion 245 of the fitting recess 240 is disposed so as to face the opening portion moving from the gripping portion 280 toward the fitting recess 240. Further, the weak fitting portion 245 is paired with the weak fitting portion 245' provided at the opposite position.

[0045] On the one hand, as shown in FIG. 6(a), the strong fitting portion 244 is disposed on the side facing the edge portion 201 except at the location where the weak fitting portion 245 is provided. And the strong fitting portion 244 is paired with the strong fitting portion 244' provided at the opposing position.

[0046] Note that the strong fitting portion 244 strengthens the fitting force by a convex shape, and the weak fitting portion 245 weakens the fitting force compared to the strong fitting portion 244 by not providing a convex shape. However, the present invention is not limited thereto. As long as the strong fitting portion 244 has a stronger fitting force than the weak fitting portion 245 and the weak fitting portion 245 has a weaker fitting force than the strong fitting portion 244, any configuration can be adopted. For example, the weak fitting portion 245 may weaken the fitting force by a concave shape, and the strong fitting portion 244 may strengthen the fitting force by not providing a concave shape. Also, the thickness of the weak fitting portion 245 may be made thinner to weaken the fitting force, and the thickness of the strong fitting portion 244 may be made thicker to strengthen the fitting force. Further, the fitting recess 240 includes a pair of strong fitting portions and a pair of weak fitting portions, but is not limited thereto, and may include only one strong fitting portion 244 and one weak fitting portion 245.

[0047] Also, as shown in FIGS. 4(a), 5(a), and 6, a plurality of reinforcing ribs 213 extending along the edge 211 are formed on the edge 211 of the bottom surface 210 adjacent to the fitting recess 240. Each reinforcing rib 213 is convex upward and arranged parallel to each other. By these reinforcing ribs 213, the distortion of the bottom surface 210 near the fitting recess 240 due to an impact from the side or stress when lifting the packaging container 300 is suppressed, preventing the fitting between the fitting convex portion 140 and the fitting recess 240 from coming off and the lid body 100 from accidentally opening. Further, in the vicinity of the fitting recess 240, short cross ribs 214 that intersect the reinforcing ribs 213 and connect adjacent reinforcing ribs 213 to each other are provided. By these cross ribs 214, the distortion of the bottom surface 210 near the fitting recess 240 can be further suppressed. Also, reinforcing ribs 221 extending in the vertical direction are provided on the side surface 220 adjacent to the fitting recess 240 to reinforce the fitting recess 240 so that it does not collapse. Further, a substantially triangular connecting rib 215 that connects the side surface 220 and the bottom surface 210 is provided between the side surface 220 and the bottom surface 210 adjacent to the fitting recess 240. As shown in FIG. 6(c), even when an external force F is transmitted to the side surface 220 due to an impact from the edge 201 side, the connecting rib 215 suppresses the distortion around the side surface 220, preventing the fitting between the fitting convex portion 140 and the fitting recess 240 from coming off and the lid body 100 from accidentally opening.

[0048] Also, as shown in FIG. 4, in plan view, the width of the leg portion 212 extending along the outer periphery of the bottom surface 210 is L1. And, as shown in FIG. 5(a), in plan view, the width of the leg portion 212 of the bottom surface 210 located between the fitting recesses 240 is L2, and the width L2 is wider than the width L1. In this way, by widening the width L2 of the leg portion 212 of the bottom surface 210 located between the fitting recesses 240, the ground contact area of the bottom surface 210 around the fitting recesses 240 increases. Thereby, the distortion of the bottom surface 210 around the fitting recesses 240 is suppressed, preventing the fitting between the fitting convex portion 140 and the fitting recess 240 from coming off and the lid body 100 from accidentally opening. Also, since the reinforcing ribs 221 provided on the side surface 220 extend to the leg portion 212 of the bottom surface 210, the distortion around the leg portion 212 is further suppressed.

[0049] In addition, in order to prevent deformation around the fitting recess 240 of the container body 200, the side surface 220 and the bottom surface 210 located below the fitting recess 240 are provided with a reinforcing rib 221, a reinforcing rib 213, an intersecting rib 214, and a connecting rib 215 as anti-distortion means. However, the present invention is not limited to this. The container body 200 may be provided with one or more of the reinforcing rib 221, the reinforcing rib 213, the intersecting rib 214, and the connecting rib 215. Further, the container body 200 may be provided with ribs of any shape as anti-distortion means at any location below the fitting recess 240. Further, the anti-distortion means suppresses distortion around the fitting recess 240 and prevents the lid body 100 from accidentally opening.

[0050] Next, with reference to FIGS. 7 and 8, the packaging container 300 in a state where the lid body 100 is attached to the container body 200 will be described. Note that FIG. 7(a) is a plan view of the packaging container 300, FIG. 7(b) is a side view of the packaging container 300, FIG. 7(c) is a plan view of the packaging container 300 with the periphery of the grip portion 180 enlarged, FIG. 8(a) is a cross-sectional view taken along the line I-I of FIG. 7, FIG. 8(b) is a cross-sectional view taken along the line J-J of FIG. 7, FIG. 8(c) is a cross-sectional view taken along the line K-K of FIG. 7, and FIG. 8(d) is a cross-sectional view taken along the line L-L of FIG. 7.

[0051] In a state where the lid body 100 is attached to the container body 200, the fitting convex portion 140 of the lid body 100 is fitted into the fitting recess 240 of the container body 200. In this way, in the packaging container 300, the lid body 100 is prevented from accidentally coming off the container body 200 by the fitting uneven portion 340 composed of the fitting convex portion 140 and the fitting recess 240 that fit into each other. Since the fitting convex portion 140 of the lid body 100 is vertically fitted into the fitting recess 240 of the container body 200, the fitting uneven portion 340 is configured by a button-type fitting as in the prior art.

[0052] Also, as shown in FIGS. 7(a) and 8(c), at each corner portion 303 of the packaging container 300, the fitting portion 170 of the lid body 100 is externally fitted to the fitting portion 270 of the container body 200, so that the lid body 100 is prevented from accidentally coming off the container body 200. In this way, in the packaging container 300, the lid body 100 is firmly attached to the container body 200 by the fitting between the fitting portion 170 of the lid body 100 and the fitting portion 270 of the container body 200 at the four corner portions 303 and the fitting of the fitting uneven portion 340 at the front edge portion 301. Further, in the circumferential direction of the packaging container 300, the flange portion 130 at the edge of the lid body 100 and the flange portion 230 at the edge of the container body 200 are in close contact with each other vertically, so that dust and the like do not enter from the edge of the packaging container 300 into the interior.

[0053] Also, as shown in FIG. 8(c), the inner abutting portion 160 of the lid body 100 abuts against the outer abutting portion 260 of the container body 200 from the inside. In this way, by the inner abutting portion 160 and the outer abutting portion 260 abutting against each other from the inside and outside, the abutting portion is in a state where it is slightly fitted, and while maintaining the ease of opening, the lid body 100 is prevented from accidentally coming off the container body 200. In particular, outside the flange portion 130, the fitting portion 170 of the lid body 100 is fitted to the fitting portion 270 of the container body 200, and inside the flange portion 130, the inner abutting portion 160 and the outer abutting portion 260 are in a state of abutting and fitting. Therefore, since the fitting is made by sandwiching from the inside and outside, the fitting between the lid body 100 and the container body 200 is made stronger at the corner portion 303, and the lid body 100 is prevented from accidentally coming off the container body 200. Note that the inner abutting portion 160 is provided on the flange portion 130 side of the lid body 100, and the outer abutting portion 260 is provided on the flange portion 230 side of the container body 200, but it is not limited thereto, and the outer abutting portion 260 may be provided on the flange portion 130 side of the lid body 100, and the inner abutting portion 160 may be provided on the flange portion 230 side of the container body 200. Further, the inner abutting portion 160 is provided on a part of the flange portion of the packaging container 300, but it is not limited thereto, and the inner abutting portion 160 may be continuously provided on the entire flange portion of the packaging container 300, that is, continuously around the circumferential direction.

[0054] Further, as shown in FIG. 8(d), the inner abutting portion 150 of the lid body 100 is configured to be able to abut from the inside of the outer abutting portion 250 of the container body 200. Normally, the protrusion 151 of the flange portion 130 of the lid body 100 is placed in the recessed portion 251 of the flange portion 230 of the container body 200 so as not to shift. However, even if the flange portion 130 of the lid body 100 and the flange portion 230 of the container body 200 are displaced due to an external force from the side, the inner abutting portion 150 and the outer abutting portion 250 abut against each other from the inside and outside, so that the abutting portion is in a state where it is lightly fitted, and the ease of opening is maintained while the lid body 100 is prevented from accidentally coming off the container body 200. Note that the inner abutting portion 150 is provided on the flange portion 130 side of the lid body 100, and the outer abutting portion 250 is provided on the flange portion 230 side of the container body 200, but it is not limited thereto. The outer abutting portion 250 may be provided on the flange portion 130 side of the lid body 100, and the inner abutting portion 150 may be provided on the flange portion 230 side of the container body 200. Further, the inner abutting portion 150 is provided on a part of the flange portion of the packaging container 300, but it is not limited thereto. The inner abutting portion 150 may be provided continuously on the entire flange portion of the packaging container 300, that is, continuously around the circumferential direction.

[0055] Here, when removing the lid body 100 from the container body 200, the lid body 100 is lifted and opened by pinching the knob portion 180 of the lid body 100 and the knob portion 280 of the container body 200 with fingers. Therefore, the edge portion 301 around the knob portion 180 becomes the opening start position X where the lid body 100 starts to be opened from the container body 200.

[0056] Furthermore, as shown in FIGS. 7(c) and 8(a), in the fitting uneven portion 340, the weak fitting portion 145 of the fitting convex portion 140 is fitted into the weak fitting portion 245 of the fitting concave portion 240 to constitute a weak fitting. The weak fitting portion 345 that constitutes this weak fitting is disposed on the side facing the opening start position X and the edge portion 301. When the lid body 100 is opened along the edge portion 301 from the opening start position X, the force W applied during opening is transmitted along the edge portion 301 and will eventually disengage the fitting of the fitting uneven portion 340. At this time, since the force W is transmitted to the weak fitting portion 345 on the side facing the opening start position X, the fitting of the fitting uneven portion 340 can be easily disengaged, and it is easy to open the lid body 100 from the container body 200.

[0057] On the other hand, as shown in FIGS. 7(c) and 8(b), in the fitting uneven portion 340, the strong fitting portion 144 of the fitting convex portion 140 is fitted into the strong fitting portion 244 of the fitting concave portion 240 to constitute a strong fitting. The strong fitting portion 344 that constitutes this strong fitting is disposed on the side facing the edge portion 301 except at the location where the weak fitting portion 345 is provided. Therefore, even if an impact F (see FIG. 7(c)) is applied to the front edge portion 301, the fitting of the strong fitting portion 344 is difficult to disengage, and it is possible to prevent the lid body 100 from being inadvertently detached from the container body 200.

[0058] Note that since the rear edge 301 of the packaging container 300 is connected to the lid body 100 and the container body 200 by the hinge portion 104, it will not be opened. Therefore, the fitting uneven portion 340 is provided only along the front edge 301. However, it is not limited to this. When the lid body 100 and the container body 200 are not connected by the hinge portion 104 and the lid body 100 and the container body 200 are independent of each other, the fitting uneven portion 340 may be provided along the rear edge 301. Further, as shown in Fig. 8(a), in the weak fitting portion 345 of the fitting uneven portion 340, the weak fitting portion 145 without unevenness of the lid body 100 and the weak fitting portion 245 without unevenness of the container body 200 are in contact with each other, and they are not fitted in a form in which the weak fitting portion 145 and the weak fitting portion 245 are engaged by the unevenness of each other. However, it is not limited to this. As long as the weak fitting portion 345 of the fitting uneven portion 340 has a weaker fitting force than the strong fitting portion 344, the weak fitting portion 145 and the weak fitting portion 245 may be fitted in a form in which they are engaged by the unevenness of each other.

[0059] Note that the lid body 100 and the container body 200 are substantially rectangular in plan view, but it is not limited to this, and they can have any shape such as substantially polygonal in plan view or substantially circular in plan view. Further, the lid body 100 and the container body 200 are formed by sheet forming (for example, vacuum forming, pressure air forming, hot plate forming) using a sheet-like material having a thickness of about 0.1 mm to 1.0 mm. For example, as the material of the lid body 100 or the container body 200, polystyrene, polypropylene, polyethylene, A-PET, polylactic acid, or those obtained by biaxially stretching these can be used.

[0060] Note that the packaging container of the present invention is not limited to the above embodiments, and various modifications and combinations are possible within the scope described in the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the right.

Claims

1. A packaging container comprising a lid body and a container body, which have fitting concave and convex portions that fit into each other, wherein the opening start position where the lid body and the container body start to be opened and the fitting concave and convex portions are arranged along the edges of the lid body and the container body, in the fitting concave and convex portions, a weak fitting portion with a weak fitting strength is provided on the side facing the opening start position, a pair of strong fitting portions with a strong fitting strength are provided at locations other than the location where the weak fitting portion of the fitting concave and convex portions is provided, one of the pair of strong fitting portions is provided on the side facing the edge, the other of the pair of strong fitting portions is provided so as to face one of the strong fitting portions, a packaging container characterized by this.

2. The lid body has a top surface, a side surface, and a flange portion, the container body has a bottom surface, a side surface, and a flange portion, the fitting concave and convex portions are provided on the flange portion of the lid body and the flange portion of the container body, the packaging container according to claim 1, characterized in that distortion prevention means is provided on the side surface, or the bottom surface, or the top surface located above and below the fitting concave and convex portions.

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