Inner containers, composite containers, and liquid storage containers

Abstract

The present invention aims to provide an inner container that can form a sealed space inside an inner container attached to an outer container with a simple configuration. [Solution] The inner container of the present invention is an inner container to be fitted into an outer container having a bottomed cylinder and a gasketed lid that closes its opening, comprising: an inner container body having a bottom disc and a cylinder; a disc having a smaller diameter than the opening of the inner container body; a ring plate surrounding the disc when viewed from the thickness direction of the disc, the inner diameter of which is smaller than the opening of the inner container body and which rests on the edge of the opening; and a connecting cylinder that connects the entire periphery of the disc and the entire inner periphery of the ring plate, and an inner lid that closes the opening of the inner container body. When the gasket is placed on the ring plate around its entire circumference and the bottomed cylinder is closed with the gasketed lid, the connecting cylinder bulges radially outward, and one or both of the connecting cylinder and the disc press against the cylinder around their entire circumference.

Description

【Technical Field】 , , , , , 【0006】 , , , 【0005】 , , , , 【0001】 The present invention relates to an inner container, a composite container, and a liquid storage container. 【Background Art】 【0002】 In Patent Document 1, as shown in FIG. 1 thereof, there is disclosed a container for storing raw materials for on-site foamed urethane, which includes an outer container having a detachable upper lid, and an inner bag that covers the inside of the outer container from which the upper lid has been removed and can store the raw materials. 【0003】 Considering paragraphs "0004", "0005", etc. in the specification of this document, since it is common for the container after the raw materials are emptied to be discarded as it is, it is disclosed that the above invention was created for the purpose of making the container for storing raw materials for on-site foamed urethane reusable. And for the above container, only the inner bag in which the raw materials have become shells after use is discarded, the outer container is recovered, and if an inner bag containing new raw materials is attached to the same outer container, the outer container can be reused. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2016-216098 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 By the way, although the container disclosed in Patent Document 1 can realize the reuse of the outer container, the structure of attaching the inner bag (see FIG. 1 of Patent Document 1), which is a container for directly storing raw materials, to the outer container is not simple. 【0006】 An object of the present invention is to provide an inner container that can form a sealed space inside an inner container attached to an outer container with a simple structure. [Means for solving the problem] 【0007】 The inner container of the first embodiment is An inner container made of resin, which is fitted into an outer container having a bottomed cylinder with an arc-shaped opening edge at one end in the axial direction and a gasketed lid that closes the opening of the bottomed cylinder, and which forms a sealed space inside, (A1) A bottom disc that contacts or is opposed to the inner surface of the bottom wall of the bottomed cylinder with a gap between them, and (A2) an inner container body having a cylinder that protrudes from the entire circumference of the bottom disc to just before the opening edge such that its diameter gradually increases and contacts or is opposed to the inner surface of the peripheral wall of the bottomed cylinder with a gap between them, (B1) A disc with a diameter smaller than the opening of the inner container body, (B2) A ring plate surrounding the disc when viewed from the thickness direction of the disc, having an inner diameter smaller than the opening of the inner container body, and resting on the edge of the opening over its entire circumference when mounted on the bottomed cylinder, and (B3) An inner lid that closes the opening of the inner container body, having a connecting cylinder that connects the entire periphery of the disc and the entire inner periphery of the ring plate so as to form a step between the disc and the ring plate, and having a connecting cylinder that protrudes from the entire periphery of the disc to the entire inner periphery of the ring plate so as to gradually increase in diameter, Equipped with, When the gasket of the gasketed lid is placed on the ring plate around its entire circumference and the bottomed cylinder is closed with the gasketed lid, the ring plate is bent along the opening edge, the connecting cylinder bulges radially outward, and one or both of the connecting cylinder and the disc press against the cylinder around their entire circumference. The inner container of the second embodiment is In the inner container of the first embodiment, The ring plate has a thickness that gradually increases from its entire outer edge to its entire inner edge. The inner container of the third embodiment is The front surface of the ring plate opposite to the side that rests on the opening edge is formed as a flat surface. The ring plate is composed of an outer circular portion and an inner circular portion that is surrounded by the outer circular portion and is thicker than the outer circular portion. A stepped surface is formed at the boundary between the outer circular portion and the inner circular portion on the back surface of the ring plate, by the end face of the inner circular portion. When the inner lid is attached to the bottomed cylinder, the end of the inner circular portion contacts the opening edge, so that the outer circular portion rests on the opening edge over its entire circumference. The inner container of the fourth embodiment is In the inner container of any one of the first to third embodiments, The main body of the inner container and the inner lid are both molded products made of the same resin. The thickness of the connecting cylinder is thinner than the thickness of the ring plate and the thickness of the cylinder. The inner container of the fifth embodiment is, In the inner container of any one of the first to fourth embodiments, The aforementioned disc, in its standalone state, bulges in one direction along its thickness. When the gasket of the gasketed lid is placed on the ring plate around its entire circumference and the bottomed cylinder is closed with the gasketed lid, it deforms in such a way that the amount of bulging is reduced. The inner container of the sixth embodiment is: In the inner container of any one of the first to fifth embodiments, The thickness of the connecting cylinder is set to gradually decrease from the connection point with the ring plate to the connection point with the disc. The thickness of the disc is set to gradually decrease from its entire periphery, which is the connection point with the connecting cylinder, towards the center. One embodiment of a composite container is: An outer container having a bottomed cylinder with an arc-shaped opening edge at one end in the axial direction and a gasketed lid that closes the opening of the bottomed cylinder, An inner container according to any one of the first to sixth embodiments, the inner container being attached to the outer container, It is equipped with. A liquid storage container according to one aspect a composite container according to one aspect, the liquid stored in the inner container, and comprises. 【Effect of the Invention】 【0008】 The inner containers of the first to sixth aspects have a simple structure and can form a sealed space inside the inner container attached to the outer container. A composite container according to one aspect has a simple structure and can form a sealed space inside the inner container attached to the outer container. A liquid storage container according to one aspect has a simple structure and does not allow or makes it difficult for the liquid stored inside the inner container attached to the outer container to adhere to the inner surface of the outer container. 【Brief Description of the Drawings】 【0009】 [Figure 1] It is a perspective view of the liquid storage container of the embodiment (this embodiment) of the present invention. [Figure 2] It is a longitudinal sectional view of the liquid storage container of this embodiment, which is a longitudinal sectional view obtained by cutting the liquid storage container of FIG. 1 along the cutting line 2-2. [Figure 3] It is an enlarged view of the portion surrounded by the broken line 3 in FIG. 2. [Figure 4] It is a longitudinal sectional view of the combination of the liquid, the inner container body, the pallet can body, and the inner lid in the state (lid closed) where the ring plate of the inner lid is resting on the opening edge of the pallet can body in which the inner container body is inserted and the liquid is stored in this embodiment. [Figure 5] It is a schematic diagram showing the positional relationship between a perspective view of the combination excluding the liquid from FIG. 4 as viewed from one end side in the axial direction and a part of the longitudinal sectional view of FIG. 4. [Figure 6] It is a schematic diagram for explaining the change between the inner lid immediately before closing the lid and the inner lid immediately after closing the lid in this embodiment. [Figure 7] It is a schematic diagram for explaining the change between the inner lid immediately before closing the lid and the inner lid immediately after closing the lid in the first modification. [Figure 8] This is a schematic diagram illustrating the changes in the inner lid immediately before closing and immediately after closing in the second modified example. [Figure 9] This is a schematic diagram illustrating the changes in the inner lid immediately before closing and immediately after closing in the third modified example. [Modes for carrying out the invention] 【0010】 ≪Overview≫ The embodiment and several modified examples will be described below in the order in which they are described. 【0011】 This embodiment The functions and configuration of the composite container 10 (see Figures 1 and 2) of this embodiment, the manufacturing method of the inner container 30 (see Figures 2, 4, and 5), the method of setting the liquid storage container 12 (see Figures 1 and 2), and the effects will be described in the order listed above. The table below summarizes the components of the composite container 10, the liquid storage container 12 (see Figures 1 and 2), the inner container 30, and the liquid L, prior to the explanation of the composite container 10. The liquid container 12 contains liquid L inside the inner container 30 of the composite container 10. ===================================== Name Component ===================================== Liquid container 12, composite container 10, liquid L Composite container 10, pail can 20, inner container 30 Inner container 30, Inner container body 32, Inner lid 34 ===================================== 【0012】 <Function and configuration of the composite container of this embodiment> In the composite container 10 of this embodiment, as described later, the inner container 30, which is installed inside the pail can 20, is configured to be detachable from the pail can 20. Therefore, in the composite container 10 of this embodiment, for example, by replacing an inner container 30 that has become empty of the liquid L (see Figure 2) with another inner container 30, the pail can 20 can be reused without any liquid L adhering to it. An example of liquid L is paint, oil, etc. In this specification, it should be noted that, in the concept of liquid L, even if the object contained inside the inner container 30 is a liquid containing solid components, that liquid is not excluded from the definition of liquid L. As described above, the function of the composite container 10 is to prevent liquid L from adhering to the inner surface of the pail can 20 by storing the liquid L inside the inner container 30, which is attachable to and replaceable with the pail can 20, rather than directly storing the liquid L inside the pail can 20. This makes it possible to reuse the pail can 20 without cleaning the inside. 【0013】 As shown in Figures 1 and 2, the composite container 10 of this embodiment comprises a pail can 20 and an inner container 30. 【0014】 [Pale can] As shown in Figure 1, the pail can 20 has a pail can body 22, a handle 24, a lid with a gasket 26, and a lever band 28. The pail can 20 is made of metal as an example, but it may be made of resin as long as it is harder than the resin inner container 30. 【0015】 (The main body of the pail can) As shown in Figure 2, the pail body 22 is a bottomed cylinder (a cylinder with a bottom plate at one end in the axial direction) having a bottom wall 221 and a peripheral wall 222, and an opening OP1 (see Figure 2) is formed at one end in the axial direction (in the figure, the axis of the pail body 22 is denoted as axis O). In this specification, the side of the pail body 22 with the opening OP1 is referred to as one end in the axial direction, and the opposite side (the side with the bottom wall 221) is referred to as the other end in the axial direction. The base wall 221 is simply a disc. The peripheral wall 222 is a cylinder in which the diameter (both inner and outer diameter) gradually increases from the entire circumference of the bottom wall 221 at the other end in the axial direction towards the other end. As shown in Figure 3, one end of the peripheral wall 222 on the axial side (opening edge 224) is bent radially outward. Therefore, the cross-section (cut surface) obtained by cutting the opening edge 224 with a virtual line perpendicular to the circumferential direction has an arc-shaped outer surface. From the above, it can be said that the pail body 22 is a bottomed cylinder having an open edge 224 with an arc-shaped cross-section at one end in the axial direction. 【0016】 (handle) The handle 24 is attached to the outer circumferential surface of the peripheral wall 222, as shown in Figure 1. 【0017】 (Lid with gasket) As shown in Figures 2 and 3, the gasketed lid 26 closes the opening OP1 of the pail body 22, and together with the pail body 22, forms a closed space inside the pail 20. The gasketed lid 26, as shown in Figures 1 and 2, has a top plate 261, an outer ring 262, and a gasket 263. The top plate 261 is simply a circular disc. The outer ring 262 is a ring-shaped member that, when viewed from the thickness direction of the top plate 261, is connected to the entire peripheral edge of the top plate 261, and protrudes from the top plate 261 from the other end in the axial direction to one end, while being recessed toward the other end in the axial direction. The gasket 263 is a piece of rubber that is fitted around the entire circumference of the recessed portion of the outer ring 262. 【0018】 (Lever band) As shown in Figure 1, the lever band 28 is used to secure the gasketed lid 26 to the pail body 22. The lever band 28 has a recessed portion that faces radially inward, into which the outer ring 262 of the gasketed lid 26 is fitted. By operating the lever, the band diameter is reduced, and the outer ring 262 is pressed against the opening edge 224 of the pail body 22, compressing and deforming the gasket 263 and securing the gasketed lid 26 to the pail body 22. In the case of a normal pail can 20, the lever band 28 secures the gasketed lid 26 to the pail can body 22. However, in this embodiment, the gasketed lid 26 and the ring plate 342 of the inner lid 34 of the inner container 30 (see Figure 4) are secured to the pail can body 22. 【0019】 [Inner container] The inner container 30 has the function of containing liquid L. Furthermore, the inner container 30 is placed inside the pail can 20, forming a sealed space CS (see Figure 2) inside the inner container 30, which prevents the liquid L contained inside from adhering to the pail can 20, or in other words, prevents the liquid L from leaking out of the inner container 30 from inside the pail can 20. The inner container 30 is, for example, made of resin such as polypropylene (PP) or polyethylene (PE). As shown in Figure 2, the inner container 30 comprises an inner container body 32 and an inner lid 34. Figure 2 is a longitudinal cross-sectional view of the main parts of the composite container 10 and the liquid storage container 12, or, to put it another way, a longitudinal cross-sectional view of them with the inner container 30 attached to the pail can 20. In contrast, Figure 4 is a longitudinal cross-sectional view of the composite container 10 at the assembly stage, with the inner container body 32 inserted into the pail can 20 and the inner lid 34 resting on the opening edge 224 of the pail can 20 (with almost only its own weight acting on it). Although Figure 4 relates to the state before Figure 2, the inner container 30 is deformable enough to significantly change its original shape before and after being attached to the pail can 20. 【0020】 (Inner container body) The inner container body 32 has the function of holding liquid L inside. The inner container body 32 is a bottomed cylinder having a bottom disc 321 and a cylinder 322. As shown in Figures 2 and 4, when the bottom disc 321 is inserted into the pail body 22, it contacts or faces the inner surface of the bottom wall 221 of the pail body 22 with a gap between them. The cylinder 322 protrudes from the entire circumference of the bottom disc 321 to just before the opening edge 224, gradually increasing in diameter, and contacts or faces the inner surface of the peripheral wall 222 of the pail can body 22 with a gap between them. Here, the length (distance) of the portion of the inner circumferential surface of the peripheral wall 222 of the pail body 22 where the cylinders 322 are not facing each other is defined as length DS1 (see Figure 4). 【0021】 (Inner lid) The inner lid 34 has the function of closing the opening OP2 (see Figure 2) of the inner container body 32. The inner lid 34, as shown in Figures 2 and 4, has a disc 341, a ring plate 342, and a connecting cylinder 343. In Figures 2 and 4, reference numeral BL1 indicates the boundary line between the ring plate 342 and the connecting cylinder 343, the entire inner circumference of the ring plate 342, or the upper axial end of the connecting cylinder 343. Reference numeral BL2 indicates the boundary line between the connecting cylinder 343 and the disc 341, the entire outer circumference of the disc 341, or the other axial end of the connecting cylinder 343. In this embodiment, the thicknesses of the disc 341, the ring plate 342, and the connecting cylinder 343 are set to be the same, for example. However, the entire peripheral edge (boundary line BL2) of the disc 341 and the entire inner peripheral edge (boundary line BL1) of the ring plate 342, which will be described later, are thicker than the thickness of the connecting cylinder 343 because they are bent portions connected to the connecting cylinder 343. Also, the thicknesses of the disc 341, the ring plate 342, and the connecting cylinder 343 are thicker than the thickness of the cylinder 322 of the inner container body 32, for example. 【0022】 As shown in Figure 2, the disc 341 functions as a top plate that forms most of the inner lid 34. As shown in Figures 4 and 5, the disc 341, in its standalone state (with only its own weight acting on it), has a smaller diameter than the opening OP1 of the inner container body 32. The disc 341 bulges outwards on one side in its thickness direction. As shown in Figures 4 and 5, in this embodiment, the bulge is on the side opposite to the ring plate 342 in the axial direction (the other end in the axial direction). 【0023】 As shown in Figure 5, the ring plate 342 surrounds the disc 341 when viewed from the thickness direction (axial direction) of the disc 341. The inner diameter of the ring plate 342 is smaller than the opening OP1 of the inner container body 32. Also, as shown in Figures 4 and 5, the outer circular portion 3421 of the ring plate 342 rests on the opening edge 224 over its entire circumference when it is attached to the pail can body 22. Furthermore, the connection portion of the outer circular portion 3421 and the inner circular portion 3422 of the ring plate 3422 (see Figures 3, 5, etc.) is pressed by the gasket 263 of the gasketed lid 26 and deforms to conform to the shape of the opening edge 224 when the composite container 10 is assembled, as shown in Figures 2 and 3. Here, the width of the inner circular portion 3422 is defined as length DS2 (see Figure 4). 【0024】 As shown in Figures 4 and 5, the connecting cylinder 343 has the function of connecting the entire peripheral edge (boundary line BL2) of the disc 341 and the entire inner peripheral edge (boundary line BL1) of the ring plate 342, so that the disc 341 and the ring plate 342 form a step. The connecting cylinder 343 protrudes from the entire circumference (boundary line BL2) of the disc 341 to the entire inner circumference (boundary line BL1) of the ring plate 342, with its diameter gradually increasing. Here, the width of the connecting cylinder 343 (the length from boundary line BL1 to boundary line BL2) is defined as length DS3 (see Figure 4). The sum of lengths DS2 and DS3 is greater than length DS1. 【0025】 The above describes the function and configuration of the composite container 10 of this embodiment. 【0026】 <Method for manufacturing the inner container of this embodiment> Next, the manufacturing method of the inner container 30 of this embodiment will be described. The inner container 30 is manufactured using a vacuum forming apparatus (not shown) by a so-called vacuum forming method. 【0027】 First, the resin sheet (not shown) that will form the inner container 30 is heated (heating step). Next, a mold (not shown) with an outer shape similar to the inner surface of the pail can body 22 is placed opposite one side of the sheet heated in the heating process, and while creating a vacuum in the space on the side of this one side, either the mold or the sheet is brought relatively closer to the other side to mold the heated sheet into the shape of the mold (molding process). Next, the sheet molded product (a resin molded product including the shape of the inner container body 32 molded by the mold) is removed from the mold, and any unnecessary parts are trimmed (trimming process). Once all of the above steps are completed, the inner container body 32 (see Figures 2 and 4) is finished. The manufacturing method for the inner lid 34 is the same as that for the inner container body 32. The difference is that the mold used is similar to the inner surface of the inner lid 34. Through the above steps, the inner container 30 (see Figures 2 and 4) is completed. 【0028】 The above describes the manufacturing method of the inner container 30 of this embodiment. 【0029】 <Method for setting up the liquid container of this embodiment> Next, the method for setting up the liquid container 12 of this embodiment will be described. This setting method is achieved by performing the mounting step, the filling step, the inner lid placement step, and the lid closing step in the order described above. 【0030】 First, in the installation process, the inner container body 32 is installed inside the pail can body 22 (see Figure 4). Next, in the injection process, liquid L is injected through the opening OP2 of the inner container body 32 attached to the pail can 20 (see Figure 4). Next, in the inner lid placement process, the outer circular portion 3421 of the ring plate 342 of the inner lid 34 is placed on the opening edge 224 of the pail can body 22 along its entire circumference (see Figures 4 and 5). As a result, the inside of the pail can body 22 is sealed off from the outside of the pail can body 22 by the inner lid 34. However, the inside of the inner container body 32 is not sealed off from the outside of the inner container body 32 by the inner lid 34. Next, in the lid closing process, the gasketed lid 26 is placed on the pail body 22 with the inner lid 34 in between, and then the gasketed lid 26 is secured to the pail body 22 by the lever band 28 (see Figures 1 to 3). In this case, first, the gasket 263 of the gasketed lid 26 is placed on the ring plate 342 around its entire circumference. Then, as the gasketed lid 26 is pressed against the pail body 22 as the lever band 28 is tightened, the outer circular portion 3421 of the ring plate 342 is bent along the opening edge 224 (see Figure 3). Accordingly, the inner circular portion 3422 of the ring plate 342 (see Figures 3 and 5, etc.) and the connecting cylinder 343 bulge radially outward due to the gasketed lid 26, and the boundary line BL2 between the connecting cylinder 343 and the disc 341 and its vicinity press against the cylinder 322 of the inner container body 32 over its entire circumference (see Figures 2 and 6). As a result, the gasketed lid 26 supports the outer circular portion 3421 of the ring plate 342 while closing the pail can body 22, and the inner lid 34 forms a sealed space CS with the inner container body 32, closing the inner container body 32 (see Figure 6). Through the above steps, the liquid container 12 (see Figures 1 and 2) is completed. 【0031】 The above describes the method for setting the liquid container 12 in this embodiment. 【0032】 <Effects of this embodiment> The inner container 30 of this embodiment can be attached to the pail can 20 with a simple configuration. Furthermore, in this embodiment, even when the cylindrical 322 of the inner container body 32 does not face a part of the inner surface of the peripheral wall 222 of the pail can body 22, the shape of the inner lid 34 is designed to easily form a sealed space CS when attached to the pail can 20. Moreover, in this embodiment, the inner container 30 of the composite container 10 can be easily attached to and detached from the pail can 20. Furthermore, the liquid container 12 of this embodiment has a simple structure that prevents or makes it difficult for the liquid L contained inside the inner container 30 attached to the pail can 20 to adhere to the inner surface of the pail can 20. Furthermore, the method of setting up the composite container 10 and the liquid container 12 in this embodiment allows for a reduction in the preparation time from attaching the inner container body 32 to the pail can 20 until the setup is complete (it can be prepared easily and quickly). 【0033】 The above is a description of the effects of this embodiment. The above concludes the description of this embodiment. 【0034】 ≪Multiple Variations≫ Below, we will describe only the parts of several modified examples that differ from this embodiment. In the following description, please note that configurations equivalent to those used in this embodiment will be described using the names and reference numerals of the configurations used in this embodiment, or equivalent names and reference numerals. 【0035】 <First variation> The correspondence between the names and reference numerals of the first modified example (see Figure 7) and the names and reference numerals of this embodiment is as follows. In the table below, it may appear that several components of this embodiment have been changed in the first modification example, but in reality, the only difference from this embodiment is that the inner cover 34 has been changed to the inner cover 34A. 【0036】 ===================================== First Modification: This Embodiment ===================================== Composite container 10A Composite container 10 Liquid container 12A Liquid container 12 Inner container 30A Inner container body 30 Inner lid 34A Inner lid 34 Disk 341A Disk 341 Ring plate 342A Ring plate 342 Outer circular section 3421A Outer circular section 3421 Inner circular section 3422A Inner circular section 3422 Connecting cylinder 343A Connecting cylinder 343 ===================================== 【0037】 Specifically, the inner lid 34A of the first modified example has the following characteristics compared to the inner lid 34 of this embodiment: (1) the diameter of the disc 341 is smaller, (2) the length DS2 of the ring plate 342 is longer, and (3) the length DS3 of the connecting cylinder 343 is also longer. 【0038】 In this embodiment (see Figure 6), the boundary line BL2 between the connecting cylinder 343 and the disc 341, and its vicinity, are pressed against the cylinder 322 of the inner container body 32 over its entire circumference, forming a sealed space CS. In contrast, in the first modified example (see Figure 7), the connecting cylinder 343A is pressed against the cylinder 322 of the inner container body 32 over its entire circumference, forming a sealed space CS. 【0039】 What we would like to disclose through the first modified example is that, when forming the sealed space CS, the portion of the inner lid 34 that contacts the cylindrical 322 of the inner container body 32 may consist only of the connecting cylinder 343A. Furthermore, in the first modified example, the contact with the cylinder 322 is made over a flatter surface than in this embodiment (where the boundary line BL2 between the connecting cylinder 343 and the disc 341 and its vicinity are in contact with the cylinder 322). Consequently, in the first modified example, the variation in contact pressure at each position in the circumferential direction can be kept smaller compared to this embodiment. 【0040】 The above is an explanation of the first modified example. 【0041】 <Second variation> The correspondence between the names and reference numerals of the second modified example (see Figure 8) and the names and reference numerals of this embodiment is as follows. In the table below, it may appear that several components of this embodiment have been changed in the second modification example, but in reality, the only difference from this embodiment is that ring plate 342 has been changed to ring plate 342B. 【0042】 ===================================== Second Modified Example: This Embodiment ===================================== Composite container 10B Composite container 10 Liquid container 12B Liquid container 12 Inner container 30B Inner container body 30 Inner lid 34B Inner lid 34 Ring plate 342B Ring plate 342 Inner circular section 3422B Inner circular section 3422 ===================================== 【0043】 Specifically, in the second modified ring plate 342B, the inner circular portion 3422B is thicker than the inner circular portion 3422 of the ring plate 342 in this embodiment. However, the front surface of the ring plate 342B is flat. Also, at the boundary between the outer circular portion 3421 and the inner circular portion 3422B on the back surface (the surface of the ring plate 342B that rests on the opening edge 224), the end face SS of the inner circular portion 3422B forms a stepped surface. 【0044】 In this embodiment (see Figure 6), the positioning of the outer circular portion 3421 of the ring plate 342, which is placed on the opening edge 224 of the pail body 22, is determined by the worker's sense of position. Therefore, variations in placement occur depending on the worker. 【0045】 In contrast, in the second modified example, when the inner lid 34B is attached to the pail can body 22, the end of the inner circular portion 3422B (end face SS or its corner portion) contacts the opening edge 244, causing the outer circular portion 3421 to rest on the opening edge 224 over its entire circumference. The positioning of the outer circular portion 3421 of the ring plate 342B that rests on the opening edge 224 of the pail can body 22 is determined by the inner circular portion 3422B. Therefore, variations in placement by the operator are minimized or eliminated. Furthermore, since the inner circular portion 3422B of the ring plate 342 in the second modified example is thicker than the inner circular portion 3422 in this embodiment, the contact pressure of the inner lid 34B with the inner container body 32 after installation can be made higher and more stable. 【0046】 As described above, the second modified example offers superior set-up performance compared to the present embodiment. Furthermore, the second modified example offers superior airtightness of the inner container 30B compared to the present embodiment. 【0047】 The above is an explanation of the second variation. 【0048】 <Third variation> The correspondence between the names and reference numerals of the third modified example (see Figure 9) and the names and reference numerals of this embodiment is as follows. In the table below, it may appear that several components of this embodiment have been changed in the third modification example, but in reality, the only difference from this embodiment is that the ring plate 342 has been changed to the ring plate 342C. 【0049】 ===================================== Third Modification: This Embodiment ===================================== Composite container 10C Composite container 10 Liquid container 12C Liquid container 12 Inner container 30C Inner container body 30 Inner lid 34C Inner lid 34 Ring plate 342C Ring plate 342 Outer circular portion 3421C Outer circular portion 3421 Inner circle portion 3422C Inner circle portion 3422 ===================================== 【0050】 Specifically, in the third modified example, the ring plate 342C, that is, the combined member of the outer circular portion 3421C and the inner circular portion 3422C, has a thickness that gradually increases from its entire outer edge to its entire inner edge. 【0051】 What we would like to disclose through the third modification is that the thickness of the ring plate 342 does not have to be uniform throughout. 【0052】 In the third modification, compared to the case where the thickness of the inner circular portion 3422C remains the same as the thickness of the outer circular portion 3421C, the contact pressure of the inner lid 34B with the inner container body 32 after installation can be made higher and more stable. 【0053】 The above is an explanation of the third variant. 【0054】 <Fourth variation> The fourth modified example (not shown) is characterized in that (1) the inner container body 32 and the inner lid 34 are molded products made of the same type of resin, and (2) the thickness of the connecting cylinder 343 is set to be thinner than the thickness of the ring plate 342 and the cylinder 322. Because the thickness of the connecting cylinder 343 is the same as the thickness of the ring plate 342, the connecting cylinder 343 is easily deformed. Also, because the thickness of the connecting cylinder 343 is thinner than the thickness of the cylinder 322, the connecting cylinder 343 that comes into contact with the cylinder 343 is easily indented along the inner surface of the cylinder 343. Based on the above, the fourth modified example offers superior airtightness between the inner container body 32 and the inner lid 34. 【0055】 <Fifth variation> The fifth modified example (not shown) is characterized in that (1) the thickness of the connecting cylinder 343 gradually decreases from the connection point with the ring plate 342 (boundary line BL1) to the connection point with the disc 341 (boundary line BL2), and (2) the thickness of the disc 341 gradually decreases from its entire periphery, which is the connection point with the connecting cylinder 343 (boundary line BL2), to the center. As described in (1) above, the connecting cylinder 343 is more easily deformed on the side closer to the boundary line BL2. Also, as described in (2) above, the disc 341 is more easily deformed on the side closer to its center. These two requirements combine to ensure that the inner lid 34 has little variation in the amount of radial outward deformation across its entire circumferential direction. Based on the above, the fifth modified example offers superior airtightness between the inner container body 32 and the inner lid 34. 【0056】 <Other variations> In the above explanation, an example of an outer container was given as a pail can 20. However, the outer container does not have to be a pail can 20 as long as an inner container 30 is inserted into it. For example, it may be a plastic container or a drum can. Furthermore, the inner container body 32 described above is a bottomed cylinder having a bottom disc 321 and a cylinder 322 (see Figure 2). However, the inner container body 32 may have other components as long as it has the bottom disc 321 and cylinder 322 as essential components. For example, it may have a ring body (not shown) that rests on or hooks onto the opening edge 224 of the pail body 22. In this case, the cross-section of the ring body may be a straight line or an arc. The cross-section of the outer circular portion 3421 of the inner lid 32 of the inner container 30 is a straight line (see Figure 4), but it may also be an arc. 【0057】 As described above, the present invention has been explained with reference to this embodiment and several modifications (hereinafter referred to as "this embodiment, etc."), but the present invention is not limited to this embodiment, etc. For example, the present invention also includes forms in which technical elements from other embodiments are added to or modified from one of the embodiments of this invention. [Explanation of symbols] 【0058】 10 Composite containers 12 Liquid containers 20 pails (outer containers) 22. Pail can body (outer container body) 221 Bottom wall 222 Peripheral wall 224 Opening edge 24 handles 26. Lid with gasket 261 Top plate 262 Outer ring 263 Gasket 28 Lever band 30 Inner container 32 Inner container body 321 Base disk 322 Cylinder 34 Inner lid 341 discs 342 Ring Plate 3421 Outer circular portion 3422 Inner circular section 343 Connecting cylinder BL1 boundary line BL2 border CS closed space DS1 Length DS2 Length DS3 Length L liquid OP1 opening OP2 opening SS end face

Claims

[Claim 1] An inner container made of resin that is fitted into an outer container having a bottomed cylinder with an arc-shaped opening edge at one end in the axial direction and a gasketed lid that closes the opening of the bottomed cylinder, and which forms a sealed space inside, (A1) A bottom disc that contacts or is opposed to the inner surface of the bottom wall of the bottomed cylinder with a gap between them, and (A2) an inner container body having a cylinder that protrudes from the entire circumference of the bottom disc to just before the opening edge such that its diameter gradually increases and contacts or is opposed to the inner surface of the peripheral wall of the bottomed cylinder with a gap between them, (B1) A disc with a diameter smaller than the opening of the inner container body, (B2) A ring plate surrounding the disc when viewed from the thickness direction of the disc, having an inner diameter smaller than the opening of the inner container body, and resting on the edge of the opening over its entire circumference when mounted on the bottomed cylinder, and (B3) An inner lid that closes the opening of the inner container body, having a connecting cylinder that connects the entire periphery of the disc and the entire inner periphery of the ring plate so as to form a step between the disc and the ring plate, and having a connecting cylinder that protrudes from the entire periphery of the disc to the entire inner periphery of the ring plate so as to gradually increase in diameter, Equipped with, The ring plate has a thickness that gradually increases from its entire outer edge to its entire inner edge. When the gasket of the gasketed lid is placed on the ring plate around its entire circumference and the bottomed cylinder is closed with the gasketed lid, the ring plate is bent along the opening edge, the connecting cylinder bulges radially outward, and one or both of the connecting cylinder and the disc press against the cylinder around their entire circumference. Inner container. [Claim 2] The front surface of the ring plate opposite to the side that rests on the opening edge is formed as a flat surface. The ring plate is composed of an outer circular portion and an inner circular portion that is surrounded by the outer circular portion and is thicker than the outer circular portion. A stepped surface is formed at the boundary between the outer circular portion and the inner circular portion on the back surface of the ring plate, by the end face of the inner circular portion. When the inner lid is attached to the bottomed cylinder, the end of the inner circular portion contacts the opening edge, so that the outer circular portion rests on the opening edge over its entire circumference. The inner container according to claim 1. [Claim 3] The main body of the inner container and the inner lid are molded products made of the same type of resin. The thickness of the connecting cylinder is thinner than the thickness of the ring plate and the thickness of the cylinder. The inner container according to claim 1. [Claim 4] The aforementioned disc, in its standalone state, bulges in one direction along its thickness. When the gasket of the gasketed lid is placed on the ring plate around its entire circumference and the bottomed cylinder is closed with the gasketed lid, it deforms in such a way that the amount of bulging is reduced. The inner container according to claim 3. [Claim 5] The thickness of the connecting cylinder is set to gradually decrease from the connection point with the ring plate to the connection point with the disc. The thickness of the aforementioned disc is set to gradually decrease from the entire periphery, which is the connection point with the connecting cylinder, towards the center. The inner container according to claim 4. [Claim 6] An outer container having a bottomed cylinder with an arc-shaped opening edge at one end in the axial direction and a gasketed lid that closes the opening of the bottomed cylinder, An inner container according to any one of claims 1 to 5, the inner container being attached to the outer container, Equipped with, Composite container. [Claim 7] An outer container having a bottomed cylinder with an arc-shaped opening edge at one end in the axial direction and a gasketed lid that closes the opening of the bottomed cylinder, An inner container, made of resin and fitted into the outer container, forming a sealed space inside, comprising: (A1) a bottom disc that contacts or faces the inner surface of the bottom wall of the bottomed cylinder with a gap between them; and (A2) a cylinder that protrudes from the entire circumference of the bottom disc to just before the opening edge, with its diameter gradually increasing, and contacts or faces the inner surface of the peripheral wall of the bottomed cylinder with a gap between them; and (B1) a disc with a smaller diameter than the opening of the inner container body; and (B2) a ring plate that surrounds the disc when viewed from the thickness direction of the disc, with an inner diameter smaller than the opening of the inner container body, and which rests on the opening edge with its entire circumference when fitted into the bottomed cylinder. The inner container comprises a gasket plate, and (B3) an inner lid that closes the opening of the inner container body, having a connecting cylinder that connects the entire periphery of the disc and the entire inner periphery of the ring plate such that the disc and the ring plate form a step, and which protrudes from the entire periphery of the disc to the entire inner periphery of the ring plate with a gradually increasing diameter, wherein when the gasket of the gasketed lid is placed on the ring plate over its entire circumference and the bottomed cylinder is closed with the gasketed lid, the ring plate is bent along the opening edge, the connecting cylinder bulges radially outward, and one or both of the connecting cylinder and the disc press against the cylinder over their entire circumference, Equipped with, Composite container. [Claim 8] The composite container according to claim 7, The liquid contained in the inner container, Equipped with, Liquid container.

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