Packaging containers

Abstract

To provide a packaging container in which a lid body hardly comes off and it is easy to recognize whether fitting is securely executed.SOLUTION: A packaging container comprising a lid body and a container body 200 is so configured that a lid body-side fitting part of the lid body and a container-side fitting part 260 of the container body are fitted to each other, wherein the container-side fitting part 260 of the container body comprises a lock part 261 which locks the lid body so that a part of the lid body-side fitting part does not come off upward, and the lock part 261 is at an angle of 45° or larger to a perpendicular direction.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD

[0001] The present invention relates to a packaging container.

BACKGROUND ART

[0002] Conventionally, packaging containers consisting of a container body for accommodating food items such as prepared dishes and condiments, and a lid body capable of being fitted to the container body, have been used in supermarkets, convenience stores and the like.

[0003] For example, the packaging container disclosed in Patent Document 1 includes a lid body and a container body, wherein food is stored in the container body and the lid body is fitted thereto. More specifically, as shown in Figure 9, in a conventional packaging container, a fitting portion configured to allow the lid body to be internally fitted is provided on the container body 800 side. This fitting portion 900 includes a locking portion 910 (a so-called undercut portion) that locks a part of the fitted lid body so as not to come off upward, and a connecting portion 920 formed to bend from the side wall side and continuous with the locking portion 910. As is well known conventionally, the locking portion 910 (the so-called undercut portion) is inclined at a gentle angle so as to be easily separated from the mold for manufacturing the container body 800.

[0004] However, since the locking portion 910 is inclined at a gentle angle, if an inadvertent force is applied to the lid body, the fitted lid body may come off. Therefore, it has been desired to further increase the fitting force so that the lid body does not come off. Furthermore, if the fitting force is weak, the tactile sensation when the lid body is fitted to the container body 800, for example, the reaction force or sound at the time of fitting, will be reduced. This has caused a problem that it is difficult for workers who store food in the packaging container in a backyard or the like to recognize whether the fitting has been reliably performed.

PRIOR ART DOCUMENTS

PATENT DOCUMENTS

[0005]

PATENT DOCUMENT 1

SUMMARY OF THE INVENTION

[0006] Therefore, in view of the above problems, the present invention provides a packaging container in which the lid is difficult to remove and which makes it easy to recognize whether the lid is securely fitted. [Means for solving the problem]

[0007] To solve the above problems, the packaging container according to claim 1 of the present invention is a packaging container comprising a lid and a container body, wherein the lid-side fitting portion of the lid and the container-side fitting portion of the container body are configured to fit together, the container-side fitting portion of the container body is provided with a locking portion that locks a part of the lid-side fitting portion of the lid so as not to come out upward, the locking portion is at an angle of 45 degrees or more with respect to the vertical direction, and the guide portion continuous above the locking portion is inclined at an angle smaller than the angle of the locking portion with respect to the vertical direction. Furthermore, the guide portion, which extends in a straight line, is configured to make surface contact with the connecting portion that extends in a straight line on the lid side fitting portion. It is characterized by the following:

[0008] Based on the above features, the locking portion has a sharper, claw-shaped undercut than conventional fitting portions, making it less likely for the lid to come loose. In addition, the container-side fitting portion with its sharp, claw-shaped undercut returns to its original position with force when fitted, producing a loud, high-pitched "snap" sound, allowing workers to easily recognize that the lid has been securely fitted to the container body.

[0009] Furthermore, the packaging container according to claim 2 of the present invention is a packaging container comprising a lid and a container body, wherein the lid-side fitting portion of the lid and the container-side fitting portion of the container body are configured to fit together, the container-side fitting portion of the container body comprises a locking portion that locks a part of the lid-side fitting portion of the lid so as not to come out upward, and a connecting portion that connects to the locking portion, the angle of the locking portion with respect to the vertical is greater than the angle of the connecting portion with respect to the vertical, and the guide portion that is continuous above the locking portion is inclined at an angle smaller than the angle of the locking portion with respect to the vertical. Furthermore, the guide portion, which extends in a straight line, is configured to make surface contact with the connecting portion that extends in a straight line on the lid side fitting portion. It is characterized by the following:

[0010] Based on the above features, the locking portion has a sharper, claw-shaped undercut than conventional fitting portions, making it less likely for the lid to come loose. In addition, the container-side fitting portion with its sharp, claw-shaped undercut returns to its original position with force when fitted, producing a loud, high-pitched "snap" sound, allowing workers to easily recognize that the lid has been securely fitted to the container body.

[0011] Furthermore, the packaging container according to the present invention is a packaging container comprising a lid and a container body, wherein the lid-side fitting portion of the lid and the container-side fitting portion of the container body are configured to fit together, and the container-side fitting portion of the container body comprises a locking portion that prevents a part of the lid-side fitting portion of the lid from coming out upward, and a connecting portion that connects to the locking portion, wherein the length of the locking portion is shorter than the length of the connecting portion.

[0012] Based on the above features, the locking portion has a sharper, claw-shaped undercut than conventional fitting portions, making it less likely for the lid to come loose. In addition, the container-side fitting portion with its sharp, claw-shaped undercut returns to its original position with force when fitted, producing a loud, high-pitched "snap" sound, allowing workers to easily recognize that the lid has been securely fitted to the container body.

[0013] Furthermore, the packaging container according to claim 3 of the present invention is characterized in that the lid-side fitting portion of the lid is internally fitted to the container-side fitting portion of the container body.

[0014] Based on the above features, the lid is less likely to come off, and it is easy to confirm whether it is securely fitted. [Effects of the Invention]

[0015] The packaging container of the present invention has a lid that is difficult to remove and makes it easy to recognize whether it is securely fitted. [Brief explanation of the drawing]

[0016] [Figure 1](a) is a plan view of the lid according to Embodiment 1 of the present invention, (b) is a front view of the lid, and (c) is an A-A end view. [Figure 2] (a) is a plan view of the container body according to Embodiment 1 of the present invention, and (b) is a front view of the container body. [Figure 3] This is a B-B end view shown in Figure 2. [Figure 4] This is a B-B end view in a state where the container bodies are stacked vertically. [Figure 5] (a) is a plan view of the packaging container according to Embodiment 1 of the present invention, and (b) is a front view of the packaging container. [Figure 6] (a) is a C-C end view shown in Figure 5, which is an end view of the state before the lid is fitted to the container body, and (b) is a C-C end view shown in Figure 5, which is an end view of the state where the lid is fitted to the container body. [Figure 7] This shows the packaging container according to Embodiment 2 of the present invention, and is an end view around the container-side fitting portion, similar to Figure 3. [Figure 8] This shows the packaging container according to Embodiment 2 of the present invention, and is an end view in a state where the lid-side fitting portion and the container-side fitting portion are fitted together, similar to Figure 6(b). [Figure 9] This is an end view around the container-side fitting portion of a conventional packaging container.

Description of Reference Numerals

[0017] 100 Lid 160 Lid-side fitting portion 200 Container body 260 Container-side fitting portion 261 Locking portion 300 Packaging container

Modes for Carrying Out the Invention

[0018] Embodiments of the present invention will be described below with reference to the drawings. In this specification, "upward" refers to the direction upward in the vertical direction when the container body is placed on a horizontal surface with its opening facing upward, and "downward" refers to the direction downward in the vertical direction.

[0019] <Embodiment 1> First, Figure 1 shows a cover 100 according to Embodiment 1 of the present invention. Figure 1(a) is a plan view of the cover 100, Figure 1(b) is a front view of the cover 100, and Figure 1(c) is an AA end view.

[0020] As shown in Figure 1, the lid 100 is a shallow dish-shaped lid with an opening at the bottom, and has a roughly rectangular shape in plan view with corner portions 110 at the four corners. It comprises a flat top surface 120 that extends horizontally, a side wall 130 that extends downward from the top surface 120, a flat flange 140 that extends outward from the tip 131 of the side wall 130, and a lid-side fitting portion 160 that is convex outward between the tip 131 of the side wall 130 and the flange 140.

[0021] Furthermore, the lid-side fitting portion 160 includes a projection 161 that engages with the locking portion of the main body-side fitting portion, which will be described later, and a connecting portion 162 connected to the tip 131 of the side wall 130. In addition, an inner wall 150 is provided between the flange 140 and the lid-side fitting portion 160. The side wall 130, flange 140, and lid-side fitting portion 160 are provided continuously or intermittently around the entire circumference of the lid 100. The lid 100 is generally rectangular in plan view, but is not limited to this, and can be any shape such as generally polygonal or generally circular in plan view.

[0022] Next, Figures 2, 3, and 4 show the container body 200 covered by the lid 100 of the present invention. Figure 2(a) is a plan view of the container body 200, Figure 2(b) is a front view of the container body 200, Figure 3 is a BB end view, and Figure 4 is a BB end view with the container body 200 stacked vertically.

[0023] As shown in Figures 2 and 3, the container body 200 has a deep dish shape that opens upward, and comprises a flat, horizontally extending bottom surface 220 that is roughly rectangular in plan view, a side wall 230 that rises upward from the bottom surface 220, a flat flange 240 that extends outward from the tip 231 of the side wall 230, and a container-side fitting portion 260 that is concave outward between the tip 231 of the side wall 230 and the flange 240.

[0024] Furthermore, the container-side fitting portion 260 includes a locking portion 261 that engages with the protrusion 161 of the lid 100, and a connecting portion 262 connected to the tip 231 of the side wall 230. In addition, a guide portion 250 is provided between the flange 240 and the container-side fitting portion 260. Moreover, at the corner portions 210 of the container body 200, a knob portion 241 is provided that extends laterally from the flange 240. The side wall 230, flange 240, and container-side fitting portion 260 are provided continuously or intermittently around the entire circumference of the container body 200. Furthermore, although the container body 200 is approximately rectangular in plan view, it is not limited to this, and can be any shape such as approximately polygonal or approximately circular in plan view.

[0025] Furthermore, as shown in Figure 3, the connecting portion 262 of the container-side fitting portion 260 is formed to bend upward from the flat tip 231 of the side wall 230, and the connecting portion 262 is inclined at an angle α with respect to the vertical axis P in the vertical direction. This angle α is the angle at which the vertical axis P and the connecting portion 262 intersect at the BB end face along the vertical axis P, as shown in Figure 3, and is the angle on the inside of the outwardly concave container-side fitting portion 260 (the side facing the bottom surface 220 and the side wall 230). The length of the connecting portion 262 is L2. This length L2 of the connecting portion 262 is the total length from the tip to the end of the connecting portion 262. Although the connecting portion 262 is shown as being straight, it is not limited to this and may have any shape, such as being gently curved.

[0026] Furthermore, the locking portion 261 connected to the connecting portion 262 is inclined at an angle β with respect to the vertical axis P. As shown in Figure 3, this angle β is the angle at which the vertical axis P and the locking portion 261 intersect at the BB end face along the vertical axis P, and is the angle on the inside of the container-side fitting portion 260 (the side facing the bottom surface 220 and the side wall 230). The angle β is 45 degrees or more. By setting the angle β to 45 degrees or more, as will be described later, the locking portion 261 can be made into a sharper claw-shaped undercut than the conventional fitting portion 900 shown in Figure 9, making it less likely for the fitting to come loose. It is desirable that the angle β of the locking portion 261 be 90 degrees or less in order to make it easier to separate from the mold used to manufacture the container body 200.

[0027] Furthermore, the angle β of the locking portion 261 is greater than the angle α of the connecting portion 262. As a result, a sharper claw-shaped undercut can be made compared to the conventional fitting portion 900 shown in Figure 9, making it less likely for the fitting to come undone. In addition, since the connecting portion 262 with angle α is inclined at a steep angle along the vertical direction, the fitting of the lid side fitting portion 160 of the lid 100 can be performed with little force, and it becomes easier to separate from the mold used to manufacture the container body 200.

[0028] Furthermore, the length of the locking portion 261 is L1. This length L1 of the locking portion 261 refers to the total length from the tip to the end of the locking portion 261. Although the locking portion 261 is shown as being straight, it is not limited to this and may have any shape, such as being gently curved.

[0029] Furthermore, the length L1 of the locking portion 261 is shorter than the length L2 of the connecting portion 262 (length L1 < length L2). Here, if the vertical height of the container-side fitting portion 260 is set to the same height as the fitting portion 900 shown in Figure 9, then making the length L1 of the locking portion 261 shorter than the length L2 of the connecting portion 262 results in the locking portion 261 having a sharper claw-shaped undercut than the conventional fitting portion 900 shown in Figure 9. Therefore, the container body 200 of the present invention is less likely to come loose than the conventional fitting portion 900.

[0030] Furthermore, the guide portion 250 connected to the locking portion 261 is inclined at an angle γ with respect to the vertical axis P. As shown in Figure 3, this angle γ is the angle at which the vertical axis P and the guide portion 250 intersect at the BB end face along the vertical axis P, and is the angle on the inside of the guide portion 250 (the side facing the bottom surface 220 and the side wall 230). The angle γ of the guide portion 250 is smaller than the angle β of the locking portion 261. In other words, the angle β of the locking portion 261 is larger than the angle γ of the guide portion 250. This guide portion 250 is the part that the lid-side fitting portion 160 of the lid 100 comes into contact with when the lid 100 is fitted onto the container body 200. Furthermore, since the guide portion 250 at angle γ is inclined at a steep angle along the vertical direction, the lid-side fitting portion 160 of the lid 100 is guided into the container-side fitting portion 260, making it easier to insert and allowing the fitting with the lid-side fitting portion 160 to be done with little force.

[0031] Furthermore, as shown in Figure 4, when the container bodies 200 are stacked for storage, the connecting portion 262 of the container-side fitting portion 260 of the upper container body 200 is in contact with the guide portion 250 of the lower container body 200. The angle γ of the guide portion 250 is smaller than the angle β of the locking portion 261, so the guide portion 250 at angle γ is inclined at a steep angle along the vertical direction. As a result, the guide portion 250, which is inclined along the vertical direction, can contact the connecting portion 262 of the upper stacked container body 200 over a wider area, increasing the stability of the stacked container bodies 200. Similarly, the angle α of the connecting portion 262 is smaller than the angle β of the locking portion 261, so the connecting portion 262 at angle α is inclined at a steep angle along the vertical direction. Therefore, the connecting portion 262, which is inclined along the vertical direction, can contact the guide portion 250 of the container body 200 stacked below it over a wider area, thereby increasing the stability of the stacked container bodies 200.

[0032] By the way, as in the conventional fitting portion 900 shown in Figure 9, if the locking portion 910 is inclined at a gentle angle θ (angle β < angle θ) and the length of the locking portion 910 is longer than the length of the connecting portion 920, the connecting portion 920 connected to the locking portion 910 will be inclined gently in the horizontal direction. Therefore, in order to ensure the stability of stacking the container body 800, it is necessary to lengthen the connecting portion 920, or to gently incline the guide portion 950 that abuts the connecting portion 920 in the horizontal direction to correspond to the connecting portion 920, or to lengthen the guide portion 950. This would result in a problem where the width of the area around the fitting portion 900 of the container body 800 increases, making the overall container body 800 larger.

[0033] However, in the container body 200 of the present invention, the angle β of the locking portion 261 is greater than the angle α of the connecting portion 262, and furthermore, the length L1 of the locking portion 261 is shorter than the length L2 of the connecting portion 262. As a result, while ensuring the stability of stacking the container body 200, the width around the container-side fitting portion 260 is made narrower than in the conventional design, making it more compact. As shown in Figures 3 and 4, the angle γ of the guide portion 250 and the angle α of the container-side fitting portion 260 are the same to ensure the high stability of stacking the container body 200, but this is not limited to this, and the angle γ of the guide portion 250 and the angle α of the container-side fitting portion 260 may be different. In addition, it is preferable that the angle γ of the guide portion 250 and the angle α of the container-side fitting portion 260 be greater than 0 degrees and less than 90 degrees in order to make it easier to separate from the mold used to manufacture the container body 200.

[0034] The lid 100 and the container body 200 are made from a sheet-like material with a thickness of approximately 0.1 mm to 1.00 mm, and are formed by sheet molding (for example, vacuum forming, pressure forming, or hot plate forming). For example, the materials used for the lid 100 and the container body 200 can be polystyrene, polypropylene, polystyrene, A-PET, polylactic acid, or biaxially stretched versions thereof, as well as paper or metal. The connecting part 262, the locking part 261, and the guide part 250 are also made from a sheet-like material and are formed by sheet molding. Therefore, the connecting part 262, the locking part 261, and the guide part 250 are formed by bending a single sheet-like material. When the connecting part 262, the locking part 261, and the guide part 250 are formed by bending a single sheet-like material, the container-side fitting part 260 is prone to elastic deformation, as will be described later, and tends to produce a loud, high-pitched sound when fitted.

[0035] Next, we will describe a packaging container 300 in which a lid 100 according to Embodiment 1 of the present invention is fitted onto a container body 200, with reference to Figures 5 and 6. Figure 5(a) is a plan view of the packaging container 300, Figure 5(b) is a front view of the packaging container 300, Figure 6(a) is a CC end view shown in Figure 5, showing the state before the lid 100 is fitted onto the container body 200, and Figure 6(b) is a CC end view shown in Figure 5, showing the state after the lid 100 is fitted onto the container body 200.

[0036] As shown in Figures 5 and 6, the lid 100 is placed over the container body 200 and pressed downwards, causing the lid-side fitting portion 160 of the lid 100 to fit internally into the container-side fitting portion 260 of the container body 200 around the entire circumference of the packaging container 300, thereby sealing the packaging container 300. This prevents the contents of the container body 200 from leaking out and prevents foreign matter from entering the packaging container 300 from the outside. Furthermore, because the flange 140 of the lid 100 and the flat edge portion 251 of the container body 200 are in close contact, it prevents foreign matter from entering the inside of the packaging container 300 from the outside and prevents foreign matter from getting between the lid-side fitting portion 160 and the container-side fitting portion 260 and causing the fitting to come undone unintentionally.

[0037] Then, as shown in Figure 6(a), when fitting the lid-side fitting portion 160 of the lid 100 to the container-side fitting portion 260 of the container body 200, the connecting portion 162 of the lid-side fitting portion 160 of the lid 100 comes into contact with the guide portion 250 of the container body 200. Due to the downward pressing force applied to the lid 100, the guide portion 250 is pushed outward, and the container-side fitting portion 260 connected to the guide portion 250 undergoes elastic deformation outward, starting from the vicinity of the connection point between the tip 231 of the side wall 230 and the connecting portion 262. Then, when the lid 100 is pushed further downward, the protruding portion 161 of the lid-side fitting portion 160 overcomes the locking portion 261 of the container-side fitting portion 260, and as shown in Figure 6(b), the lid-side fitting portion 160 and the container-side fitting portion 260 become firmly fitted together.

[0038] In particular, because the locking portion 261 has a sharper, claw-like undercut shape than conventional designs, the moment the protruding portion 161 of the lid-side fitting portion 160 overcomes the locking portion 261 of the container-side fitting portion 260, the elastically deformed container-side fitting portion 260 springs back to its original state with great force. At that time, the container-side fitting portion 260 is forcefully retracted back to its original state, producing a loud, high-pitched "snap" sound. This loud, high-pitched sound allows the worker to easily recognize that the lid 100 has been securely fitted onto the container body 200.

[0039] Furthermore, this sound reaches a level of approximately 80 dB (decibels) or higher. Therefore, the sound emitted when the packaging container 300 of the present invention is fitted together is louder and more easily recognizable than the sound emitted when conventional packaging containers are fitted together (approximately 78 dB) or the noise level in a typical backyard (approximately 75 dB). In addition, the sound emitted when the packaging container 300 of the present invention is fitted together reaches a frequency of approximately 4000 Hz (Hertz), making it easy to hear and recognize.

[0040] Furthermore, since the locking portion 261 has a sharper, claw-like undercut shape than the conventional fitting portion 900 shown in Figure 9, even if the lid 100 is about to come off, the protruding portion 161 of the lid 100 firmly locks into the locking portion 261 of the container body 200, making it difficult to come off and maintaining a strong fitting force.

[0041] In particular, in the packaging container 300 of the present invention, the force required to remove the lid-side fitting portion 160 of the lid 100 from the container-side fitting portion 260 of the container body 200 (fitting strength) is 1000 to 1700 g (grams), which is more than double the fitting strength of 500 g for conventional general packaging containers. On the other hand, as shown in Figure 6(a), when fitting the lid-side fitting portion 160 of the lid 100 into the container-side fitting portion 260 of the container body 200, the lid-side fitting portion 160 is guided by the guide portion 250, which is inclined at a steeper angle along the vertical direction than the conventional guide portion 950 shown in Figure 9. As a result, the lid-side fitting portion 160 can easily enter the container-side fitting portion 260, and fitting with the lid-side fitting portion 160 can be performed with light force. Furthermore, the force required to fit the lid-side fitting portion 160 into the container-side fitting portion 260 (fitting strength) is 600 to 800 g, which is equivalent to or less than the fitting strength of conventional general packaging containers. In the packaging container 300 of the present invention, the protruding portion 161 of the lid-side fitting portion 160 is locked into the locking portion 261 of the container-side fitting portion 260, but the invention is not limited to this, and any part of the lid-side fitting portion 160 may be locked into the locking portion 261 of the container-side fitting portion 260.

[0042] <Embodiment 2> Next, Figure 7 shows a packaging container 300A according to Embodiment 2 of the present invention. The configuration of the packaging container 300A in Embodiment 2 differs from that of the packaging container 300 in Embodiment 1, which has an internal fitting configuration, in that the packaging container 300A has an external fitting configuration. Specifically, only the configuration of the lid-side fitting portion 160A of the lid 100A and the container-side fitting portion 260A of the container body 200A differs in Embodiment 2. The other configurations are basically the same as those of the packaging container 300 in Embodiment 1, so a detailed explanation is omitted. Figure 7, like Figure 3, shows an end view of the area around the container-side fitting portion 260A, and Figure 8, like Figure 6(b), shows an end view of the state in which the lid-side fitting portion 160A and the container-side fitting portion 260A are fitted together.

[0043] As shown in Figure 7, the container-side fitting portion 260A of the container body 200A according to Embodiment 2 of the present invention is concave inward. The connecting portion 262A is formed to bend downward from the locking portion 261A, and the connecting portion 262A is inclined at an angle α with respect to the vertical axis P. This angle α is the angle at which the vertical axis P and the connecting portion 262A intersect, as shown in Figure 7, and is the angle on the outside of the container-side fitting portion 260A (opposite side of the side wall 230A). The length of the connecting portion 262A is L2A. This length L2A of the connecting portion 262A is the total length from the tip to the end of the connecting portion 262A. Although the connecting portion 262A is shown as being straight, it is not limited to this and may have any shape, such as being gently curved.

[0044] Furthermore, the locking portion 261A connected to the connecting portion 262A is inclined at an angle β with respect to the vertical axis P. As shown in Figure 7, this angle β is the angle at which the vertical axis P and the locking portion 261A intersect, and is the angle on the outside of the container-side fitting portion 260A (opposite side of the side wall 230A). The angle β is 45 degrees or more. By setting the angle β to 45 degrees or more, the locking portion 261A can be made into a sharper claw-shaped undercut than the conventional fitting portion 900 shown in Figure 9, making it less likely for the fitting to come loose. It is desirable that the angle β of the locking portion 261A be 90 degrees or less so that it can be easily separated from the mold used to manufacture the container body 200A.

[0045] Furthermore, the angle β of the locking portion 261A is greater than the angle α of the connecting portion 262A. As a result, a sharper claw-shaped undercut can be made compared to the conventional fitting portion 900 shown in Figure 9, making it less likely for the fitting to come undone. In addition, since the connecting portion 262A with angle α is inclined at a steep angle along the vertical direction, fitting with the lid-side fitting portion 160A of the lid 100A can be done with little force, and it also becomes easier to separate from the mold used to manufacture the container body 200A.

[0046] Furthermore, the length of the locking portion 261A is L1A. This length L1A of the locking portion 261A refers to the total length from the tip to the end of the locking portion 261A. Although the locking portion 261A is shown as being straight, it is not limited to this and may have any shape, such as being gently curved.

[0047] Furthermore, the length L1A of the locking portion 261A is shorter than the length L2A of the connecting portion 262A (length L1A < length L2A). Here, if the vertical height of the container-side fitting portion 260A is set to the same height as the fitting portion 900 shown in Figure 9, then making the length L1A of the locking portion 261A shorter than the length L2A of the connecting portion 262A results in the locking portion 261A having a sharper claw-shaped undercut than the conventional fitting portion 900 shown in Figure 9. Therefore, the container body 200A of the present invention is less likely to come loose than the conventional fitting portion 900.

[0048] Furthermore, the guide portion 250A connected to the locking portion 261A is inclined at an angle γ with respect to the vertical axis P. As shown in Figure 7, this angle γ is the angle at which the vertical axis P and the guide portion 250A intersect, and is the angle on the outside of the guide portion 250A (opposite the side wall 230A). The angle γ of the guide portion 250A is smaller than the angle β of the locking portion 261A. In other words, the angle β of the locking portion 261A is larger than the angle γ of the guide portion 250A. This guide portion 250A is the part that the lid-side fitting portion 160A of the lid 100A comes into contact with when the lid 100A is fitted onto the container body 200A. Furthermore, since the guide portion 250A at angle γ is inclined at a steep angle along the vertical direction, the lid-side fitting portion 160A of the lid 100A can easily fit into the container-side fitting portion 260A, and the fitting with the lid-side fitting portion 160A can be performed with little force.

[0049] Furthermore, in the container body 200A of the present invention, the angle β of the locking portion 261A is made larger than the angle α of the connecting portion 262A, and the length L1A of the locking portion 261A is made shorter than the length L2A of the connecting portion 262A. As a result, while ensuring the stacking stability of the container body 200A, the width around the container side fitting portion 260A is made narrower than in conventional designs, making it more compact.

[0050] Furthermore, as shown in Figure 8, when fitting the lid-side fitting portion 160A of the lid 100A to the container-side fitting portion 260A of the container body 200A, the container-side fitting portion 260A is elastically deformed inward by the downward pressure of the lid-side fitting portion 160A, while the protruding portion 161A of the lid-side fitting portion 160A overcomes the locking portion 261A of the container-side fitting portion 260A, resulting in a secure fit between the lid-side fitting portion 160A and the container-side fitting portion 260A. In particular, since the locking portion 261A has a sharper claw-like undercut shape than conventional designs, the moment the protruding portion 161A of the lid-side fitting portion 160A overcomes the locking portion 261A of the container-side fitting portion 260A, the container-side fitting portion 260A, which had been elastically deformed inward, quickly returns to its original state. At that time, the container-side fitting portion 260A is forcefully retracted and returns to its original position, producing a loud, high-pitched "snap" sound. This loud, high-pitched sound allows the worker to easily recognize that the lid 100A has been securely fitted onto the container body 200A.

[0051] Furthermore, since the locking portion 261A has a sharper claw-like undercut shape than the conventional fitting portion 900 shown in Figure 9, even if the lid 100A is about to come off, the protruding portion 161A of the lid 100A locks into the locking portion 261A of the container body 200A, making it difficult to come off and maintaining a strong fitting force.

[0052] Furthermore, the packaging container of the present invention is not limited to the above-described embodiments, and various modifications and combinations are possible within the scope of the claims and embodiments, and these modifications and combinations are also included within the scope of the patent rights.

Claims

1. A packaging container comprising a lid and a container body, The lid-side fitting portion of the lid and the container-side fitting portion of the container body are configured to fit together. The container-side fitting portion of the container body is equipped with a locking portion that prevents a part of the lid-side fitting portion of the lid from coming out upwards. The locking portion is at an angle of 45 degrees or more with respect to the vertical direction. The guide portion, which is continuous above the locking portion, is inclined at an angle smaller than the angle of the locking portion with respect to the vertical direction. A packaging container characterized in that the linearly extending guide portion is configured to make surface contact with the linearly extending connecting portion of the lid-side fitting portion.

2. A packaging container comprising a lid and a container body, The lid-side fitting portion of the lid and the container-side fitting portion of the container body are configured to fit together. The container-side fitting portion of the container body includes a locking portion that prevents a part of the lid-side fitting portion of the lid from coming out upward, and a connecting portion that connects to the locking portion. The angle of the locking portion with respect to the vertical is greater than the angle of the connecting portion with respect to the vertical. The guide portion, which is continuous above the locking portion, is inclined at an angle smaller than the angle of the locking portion with respect to the vertical direction. A packaging container characterized in that the linearly extending guide portion is configured to make surface contact with the linearly extending connecting portion of the lid-side fitting portion.

3. The packaging container according to claim 1 or 2, characterized in that the lid-side fitting portion of the lid is fitted internally to the container-side fitting portion of the container body.

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