Refill container attachment / detachment mechanism and cosmetic container

Abstract

The present invention provides a refill container attachment / detachment mechanism and a cosmetic container that allow the refill container to be attached and detached without detaching it from the outer container body together with the lid, and that also allows for easy attachment and detachment of the refill container. [Solution] A refill container attachment / detachment mechanism and cosmetic container that allows a refill container to be attached to either a screw-type lid or a screw-type lid body of an outer container, and to be attached to and removed from an outer container, comprising: a window-shaped screw notch formed in the refill container screw portion of the refill container which can be screwed into either a lid screw portion formed on the lid or a lid screw portion formed on the lid body; and an engaging piece that rises in a tongue shape from the upper edge of the outer container body, is capable of fitting into and engaging with the screw notch, and has a partial screw portion on its surface, wherein when the engaging piece is fitted into and engaged with the screw notch, the partial screw portion of the engaging piece and the refill container screw portion become continuous.

Description

Technical Field

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[0001] The present invention relates to a refill container attachment / detachment mechanism and a cosmetic container in which a refill container can be attached to and removed from an outer container.

Background Art

[0002] Some cosmetic containers are refill-compatible, with a refill container filled with cosmetics such as cream attached to an outer container. In such cosmetic containers, after the cosmetics are used up, the used refill container can be taken out of the outer container and replaced with a new refill container filled with cosmetics, enabling the reuse of the outer container.

[0003] Conventionally, in refill-compatible cosmetic containers, the refill container is housed inside the outer container and fixed inside the outer container by a simple undercut engagement (see, for example, Patent Documents 1 to 4). Therefore, the replacement of the refill container, that is, the attachment / detachment of the refill container to / from the outer container, is performed by simply pinching the refill container with a finger to release the undercut engagement and inserting or removing it from the outer container.

[0004] However, since the refill container for replacement filled with cosmetics is generally sold with a low-cost temporary lid seal for maintaining airtightness, the refill container sold looks cheap externally and lacks a sense of luxury.

[0005] On the other hand, there are also refill-compatible cosmetic containers that can attach a lid dedicated to the refill container to the refill container (see, for example, paragraph

[0019] of Patent Document 5).

Prior Art Documents

[0007] In refillable cosmetic containers that allow a dedicated lid to be attached to the refill container, the refill container is provided with a threaded portion that can be screwed into either the threaded portion formed on the refill container's lid or the threaded portion formed on the outer container's lid. Therefore, when inserting the refill container with the lid removed into the outer container, the refill container can be placed into the outer container's body, and then the threaded portion of the outer container's lid and the threaded portion of the refill container can be screwed together to close the lid. This ensures airtightness and secure retention of the refill container.

[0008] However, in conventional cosmetic containers of this type, the refill container and the lid of the outer container are firmly joined by screw threads, while the refill container and the body of the outer container are joined by a simple undercut engagement.

[0009] Therefore, when opening the lid of the outer container, if the lid is rotated and moved upward, the engagement between the refill container and the body of the outer container may be released before the screw threads connecting the lid and the refill container are released, causing the refill container to be pulled out of the body of the outer container along with the lid. In other words, a phenomenon occurs in which the refill container is unintentionally pulled out of the body of the outer container in which it should remain housed (hereinafter referred to as "separation" in this specification).

[0010] Furthermore, once this "separation" phenomenon occurs, the engagement force between the refill container and the main body decreases, which may lead to the "separation" phenomenon occurring more frequently in the future, potentially making it difficult to remove the refill container.

[0011] The present invention was made to solve the above-mentioned problems, and aims to provide a refill container attachment / detachment mechanism and a cosmetic container that allow the refill container to be attached and detached without coming off the main body of the outer container together with the lid, and that allows for easy attachment and detachment of the refill container. [Means for solving the problem]

[0012] To solve the above problems, the refill container attachment / detachment mechanism according to the first invention is a refill container attachment / detachment mechanism that can attach either a screw-type lid or a screw-type lid body of an outer container to a refill container, and can be installed inside the outer container and removed from the outer container, comprising: a window-shaped screw notch formed in the refill container screw portion of the refill container which can be screwed into either a lid screw portion formed on the lid or a lid screw portion formed on the lid body; and an engaging piece which rises in a tongue shape from the upper edge of the main body of the outer container, is capable of fitting and engaging with the screw notch, and has a partial screw portion on its surface, characterized in that when the engaging piece is fitted and engaged with the screw notch, the partial screw portion of the engaging piece and the refill container screw portion become continuous.

[0013] The second invention is characterized in that, in the refill container attachment / detachment mechanism according to the first invention, a tapered rib that can abut against the back surface of the engaging piece is formed near the upper part of the screw notch, and at least the engaging piece is made of an elastically deformable material.

[0014] The third invention relates to a refill container attachment / detachment mechanism according to the first or second invention, wherein the main body of the outer container comprises a first outer body having an opening on its upper surface and a first intermediate member mounted inside the first outer body, the first intermediate member having an opening on its upper surface and an engaging piece standing upright on its upper edge and having the partial screw portion on its surface, and the lid of the outer container comprises a second outer body having an opening on its lower surface and a second intermediate member mounted inside the second outer body, the second intermediate member having an opening on its lower surface and screwing into the screw portion of the refill container The refill container has a lid with a screw portion, and is formed to be housed within the first intermediate member and comprises a refill body having an opening on its upper surface, a refill container screw portion disposed to surround the upper outer circumference of the refill body, and a screw notch formed in the refill container screw portion, characterized in that when the engaging piece of the first intermediate member is inserted into the screw notch from the gap between the refill body and the refill container screw portion of the refill container and engaged, the partial screw portion of the engaging piece and the refill container screw portion become continuous.

[0015] The fourth invention is a refill container attachment / detachment mechanism according to the third invention, characterized in that the engaging piece and the screw notch are engaged by a projection formed below the partial screw portion of the engaging piece and a recess provided on the lower edge of the screw notch.

[0016] The fifth invention is a refill container attachment / detachment mechanism according to the third invention, characterized in that the tapered rib having an inclined surface from the surface of the refill body to the upper edge of the screw notch is formed in the gap between the refill body and the screw portion of the refill container and in the upper part within the screw notch.

[0017] The sixth invention is a refillable cosmetic container having an outer container and a refill container, characterized in that it is equipped with a refill container attachment / detachment mechanism according to the first invention. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a refill container detaching and attaching mechanism and a cosmetic container in which the refill container does not come off together with the lid body from the main body of the outer container, and the refill container can be easily detached and attached.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view of a cosmetic container provided with a refill container detaching and attaching mechanism according to an embodiment of the present invention. [Figure 2] It is a sectional view taken along the line A-A in FIG. 1. [Figure 3] It is a perspective view of the cosmetic container showing the state where the refill container is taken out from the cosmetic container. [Figure 4] It is an exploded perspective view of the main body. [Figure 5] It is an exploded perspective view of the lid body. [Figure 6] It is a sectional view taken along the line B-B in FIG. 3. [Figure 7] It is a sectional view taken along the line C-C in FIG. 3. [Figure 8] It is a half-sectional view for explaining the function of the refill container detaching and attaching mechanism when the refill container is attached. (a) is a view showing the state before the refill container is attached, (b) is a view showing the contact state between the protrusion of the engaging piece and the step portion of the refill container, (c) is a view showing the state at the start of elastic deformation of the engaging piece, (d) is a view showing the state when the protrusion of the engaging piece is crossing over the step portion of the refill container, and (e) is a view showing the engaging state between the protrusion of the engaging piece and the recess of the refill container. [Figure 9] It is an exploded perspective view of the cosmetic container when the refill container is completely attached. [Figure 10] It is a half-sectional view for explaining the function of the refill container detaching and attaching mechanism when the refill container is taken out. (a) is a view showing the state where the engagement between the protrusion and the recess is released, (b) is a view showing the state where the protrusion has crossed back over the step portion, and (c) is a view showing the state where the refill container is taken out. [Figure 11] It is a perspective view of the refill container at the time of single-item sales. (a) is a view showing the state where the lid is removed, and (b) is a view showing the state where the lid is attached. [Figure 12] This is a semi-cross-sectional view showing an example of a refill container attachment / detachment mechanism and a cosmetic container included within the scope of the present invention. [Modes for carrying out the invention]

[0020] The present invention relates to a refill container attachment / detachment mechanism and cosmetic container that allows a refill container, to which either a screw-type lid or a screw-type lid of the outer container can be attached, to be installed inside and removed from the outer container. The embodiments thereof will be described below with reference to the drawings.

[0021] (Example 1) Figure 1 is a perspective view of a cosmetic container equipped with a refill container attachment / detachment mechanism according to one embodiment of the present invention, Figure 2 is a cross-sectional view taken along arrow AA in Figure 1, and Figure 3 is a perspective view of the cosmetic container showing the refill container removed from the cosmetic container.

[0022] As shown in Figure 1, the cosmetic container 1 is a refillable cosmetic container and comprises an outer container 2 and a refill container 3 (shown by a dashed line) installed inside the outer container 2.

[0023] The outer container 2 consists of a main body 2A and a lid 2B.

[0024] As shown in Figure 2, the components that make up the main body 2A, the components that make up the lid 2B, and the components that make up the refill container 3 are designed to be approximately circular in plan view, for example, and share a common central axis O.

[0025] As shown in Figure 3, the refill container 3 can be installed inside and removed from the main body 2A, and the lid 2B can be attached to the main body 2A with the refill container 3 installed.

[0026] Figure 4 is an exploded perspective view of the main unit 2A.

[0027] The main body 2A of the outer container 2 is, for example, composed of a first outer casing 20 and a first intermediate member 21.

[0028] As shown in Figure 4, the first outer casing 20 is a bowl-shaped body with an opening on its upper surface and has a ring-shaped projection 20a on its inner circumferential surface near the opening. The first outer casing 20 can be formed from ceramics including porcelain, synthetic resin, glass, metal, etc., but in this embodiment, ceramics were used.

[0029] On the other hand, the first intermediate member 21 is a bottomed cylindrical body having an opening on its upper surface, and has a pair of opposing tongue-shaped engaging pieces 22 on the upper edge of the opening.

[0030] The engaging piece 22 has a partially threaded portion 23 on its surface (outer surface) that is shaped to be continuous with the threaded portion 31 of the refill container 3, which will be described later. It also has a projection 22a located below this partially threaded portion 23 for engaging with the lower edge of the threaded notch 33 of the refill container 3, which will be described later.

[0031] Furthermore, a flange portion 24 extends in a flange shape from the outer circumference of the upper edge of the opening of the first intermediate member 21, and a plurality of projection pieces 24a are arranged in a line hanging down from the periphery of this flange portion 24.

[0032] Multiple projections 24a are configured to engage with the ring-shaped projection 20a of the first outer casing 20. Therefore, by inserting the first intermediate member 21 into the first outer casing 20 and engaging the projections 24a with the ring-shaped projection 20a, the first intermediate member 21 can be firmly attached to the first outer casing 20.

[0033] The first intermediate member 21 can be formed from synthetic resins such as polyester, polystyrene, or polyolefin. Since at least the engaging piece 22 requires an elastically deformable material, in this embodiment, a polyolefin-based synthetic resin was used as the material for the first intermediate member 21.

[0034] Figure 5 is an exploded perspective view of lid 2B.

[0035] The lid 2B of the outer container 2 is composed of a second outer casing 26 and a second intermediate member 27.

[0036] As shown in Figure 5, the second outer casing 26 is a bowl-shaped body with an opening on its lower surface and has a ring-shaped projection 26a on its inner circumferential surface near the opening. The second outer casing 26 is made of the same material as the first outer casing 20.

[0037] On the other hand, the second intermediate member 27 is a cylindrical body having an opening on its lower surface, and as shown in Figures 2 and 3, it has a disc-shaped seal 27b on its inner top surface. This seal 27b is for keeping the inside of the refill container 3, which is installed inside the main body 2A, airtight, and is bonded to a spiderweb-like rib 27a formed on the top surface of the second intermediate member 27.

[0038] Furthermore, a threaded portion 29 is formed on the inner circumferential surface near the opening of the second intermediate member 27, which can be screwed into the threaded portion 31 of the refill container 3, which will be described later.

[0039] Furthermore, as shown in Figure 5, a flange portion 28 extends in a flange shape from the outer circumference of the lower edge of the opening of the second intermediate member 27, and a plurality of protruding pieces 28a are arranged upright and side by side around the periphery of the flange portion 28.

[0040] Multiple projections 28a are configured to engage with the ring-shaped projection 26a of the second outer casing 26. Therefore, by inserting the second intermediate member 27 into the second outer casing 26 and engaging the projections 28a with the ring-shaped projection 26a, the second intermediate member 27 can be firmly attached to the second outer casing 26.

[0041] The second intermediate member 27 is made of the same material as the first intermediate member 21.

[0042] Figure 6 is a cross-sectional view of section BB in the direction of the arrow in Figure 3, and Figure 7 is a cross-sectional view of section CC in the direction of the arrow in Figure 3.

[0043] The refill container 3 is a container into which cosmetics are filled, and can be inserted into or removed from the outer container 2. The refill container 3 comprises a refill body 30 and a screw portion 31.

[0044] As shown in Figure 6, the refill body 30 is a bottomed cylindrical body with an opening on its top surface, and its volume is set to be such that the refill body 30 can be stored inside the first intermediate member 21 of the outer container 2 and a desired amount of cosmetic can be filled into the refill body 30.

[0045] A flange portion 30a extends from the outer circumference of the upper edge of the opening of the refill body 30, and a cylindrical portion 32, concentric with the refill body 30, is formed hanging down from the periphery of the flange portion 30a. In other words, the cylindrical portion 32 is arranged to surround the upper outer circumference of the refill body 30, and a certain space is maintained between the cylindrical portion 32 and the refill body 30. The threaded portion 31 is formed on the surface of this cylindrical portion 32.

[0046] The cylindrical portion 32 has a stepped flange portion 32a on the outer circumference of its lower end. The first stepped portion 32b of the flange portion 32a is a step for engaging the projection 22a of the engaging piece 22 of the first intermediate member 21 of the outer container 2. The second stepped portion 32c is a step for abutting against the flange portion 24 of the first intermediate member 21, and its outer diameter is set to be the same as the outer diameter of the flange portion 24.

[0047] As shown in Figure 7, on the threaded portion 31 formed on the cylindrical portion 32, there is a pair of threaded notches 33 formed by cutting out a window-like section of the cylindrical portion 32.

[0048] The threaded portion 33 is a space that allows for continuity between the partially threaded portion 23 and the threaded portion 31 of the engaging piece 22 of the first intermediate member 21 when the engaging piece 22 of the first intermediate member 21 is fitted into the threaded portion 33. For this reason, a pair of threaded portions 33 are formed on the threaded portion 31 and at positions corresponding to a pair of engaging pieces 22 of the first intermediate member 21.

[0049] Furthermore, the recess 32b' is recessed into the stepped portion 32b, which corresponds to the lower edge of the screw notch 33. The recess 32b' is the portion that receives the projection 22a of the engaging piece 22 that has overcome the stepped portion 32b, as will be described later, and engages with the projection 22a. The length of the recess 32b' is set to be approximately the same as the length of the projection 22a. As a result, the movement of the engaging piece 22 is restricted by the recess 32b'.

[0050] In other words, when the engaging piece 22 is inserted through the gap G and fitted into the threaded portion 33, the engagement between the projection 22a and the recess 32b' maintains the fitted state between the engaging piece 22 and the threaded portion 33.

[0051] Furthermore, a pair of tapered ribs 34 are formed in the gap between the refill body 30 and the screw portion 31.

[0052] The tapered rib 34 is the part that abuts against the back surface (inner surface) of the engaging piece 22 and guides the engaging piece 22 in the direction of fitting into the screw notch 33.

[0053] Specifically, the tapered rib 34 is positioned within the gap G between the refill body 30 and the cylindrical portion 32, and above the threaded portion 33, with its inclined surface 34a extending from the surface of the refill body 30 to the upper edge of the threaded portion 33.

[0054] Such refill containers 3 can be formed from synthetic resins such as polyester, polystyrene, or polyolefin. In this embodiment, a polyolefin-based synthetic resin was used as the material for the refill container 3.

[0055] The refill container 3 can be attached to and detached from the outer container 2 by a refill container attachment / detachment mechanism structurally incorporated into the cosmetic container 1.

[0056] As described above, the engaging piece 22 of the main body 2A of the outer container 2 has a partial threaded portion 23 and a projection 22a, the lid 2B has a threaded portion 29, the cylindrical portion 32 of the refill container 3 has a threaded portion 31, a threaded notch 33, a stepped portion 32b and a recess 32b', and the tapered rib 34 is positioned near the upper part of the threaded notch 33 in the gap G.

[0057] In other words, the refill container attachment / detachment mechanism is composed of the engaging piece 22 of the main body 2A, the screw portion 29 of the lid 2B, the cylindrical portion 32 of the refill container 3, and the tapered rib 34, all of which are components incorporated into the cosmetic container 1.

[0058] Next, the operation and effects of the refill container attachment / detachment mechanism during the attachment / detachment of the refill container 3 will be explained.

[0059] Figure 8 is a half-section view illustrating the function of the refill container attachment / detachment mechanism when a refill container is attached, where (a) shows the state before the refill container is attached, (b) shows the contact state between the projection 22a of the engaging piece 22 and the stepped portion 32b of the refill container 3, (c) shows the state when the elastic deformation of the engaging piece 22 begins, (d) shows the state in the process of the projection 22a of the engaging piece 22 overcoming the stepped portion 32b of the refill container 3, and (e) shows the engagement state between the projection 22a of the engaging piece 22 and the recess 32b' of the refill container 3.

[0060] In Figure 3, when attaching the refill container 3 to the outer container 2, the refill container 3 is lowered relative to the first intermediate member 21 of the main body 2A, where the projection 24a is engaged with the ring-shaped projection 20a of the first outer body 20, as shown by the arrow in Figure 8(a). At this time, the engaging piece 22 of the first intermediate member 21 and the screw notch 33 are aligned so that the engaging piece 22 of the first intermediate member 21 is inserted into the screw notch 33 through the gap G at the lower edge of the screw notch 33 of the refill container 3.

[0061] As the refill container 3 is lowered further in this aligned state, as shown in Figure 8(b), the projection 22a of the engaging piece 22 first comes into contact with the lower surface of the stepped portion 32b of the refill container 3.

[0062] As the refill container 3 is pushed further down, the projection 22a is pressed against the stepped portion 32b of the refill container 3, and the engaging piece 22 begins to elastically deform toward the refill body 30 side of the refill container 3, as shown by the leftward-pointing arrow in Figure 8(c).

[0063] As the refill container 3 is pushed further in and lowered, as shown in Figure 8(d), the projection 22a of the engaging piece 22 goes over the stepped portion 32b, and the tip 22b of the engaging piece 22 reaches the vicinity of the flange portion 30a of the refill container 3.

[0064] Then, by lowering the refill container 3 further, the projection 22a of the engaging piece 22 completely overcomes the stepped portion 32b, and the elastic deformation of the engaging piece 22 returns to its original state as shown by the rightward arrow in Figure 8(e). It is then guided towards the threaded portion 33 by the tapered rib 34 and becomes fitted into the threaded portion 33, with the projection 22a engaging with the recess 32b'. This engagement force maintains the fitted state between the engaging piece 22 and the threaded portion 33.

[0065] Figure 9 is an exploded perspective view of the cosmetic container after the refill container 3 has been installed.

[0066] As described above, when the refill container 3 is attached to the main body 2A of the outer container 2, the partially threaded portion 23 of the engaging piece 22 fitted into the threaded portion 33 and the threaded portion 31 of the refill container 3 become continuous, as shown in Figure 9.

[0067] This allows the lid 2B to be placed over the main body 2A, and the screw portion 29 to be screwed into the continuous screw portion 31 and the partial screw portion 23 and rotated. As a result, as shown by the dashed line, the lid 2B can be attached to the main body 2A with the refill container 3 installed.

[0068] Then, by rotating the lid 2B attached to the main body 2A in the opposite direction, the screw threads 29, the continuous screw thread 31, and the partial screw thread 23 are released, allowing the lid 2B to be removed from the main body 2A.

[0069] At this time, the threaded portion 31 of the refill container 3 and the partially threaded portion 23 of the main body 2A are continuous, and the recessed portion 32b' of the refill container 3 is firmly engaged with the projection 22a of the engaging piece 22 of the main body 2A. Therefore, even if the lid 2B is rotated and moved upward, the lid 2B will not come off the main body 2A together with the refill container 3.

[0070] In other words, according to this embodiment, when removing the lid 2B, the refill container 3 is not unintentionally pulled out of the main body 2A in which it should remain housed, thus preventing a situation of "separation." Only the lid 2B can be removed from the main body 2A.

[0071] Figure 10 is a half-sectional view illustrating the function of the refill container attachment / detachment mechanism when removing the refill container, where (a) shows the state in which the engagement between the projection 22a and the recess 32b' is released, (b) shows the state in which the projection 22a has returned over the stepped portion 32b, and (c) shows the state in which the refill container 3 has been removed.

[0072] In Figure 9, when removing the refill container 3 from the main body 2A of the outer container 2, the engaging piece 22 is pressed with a finger or the like to bias it toward the refill body 30, as shown by the leftward arrow in Figure 10(a), thereby elastically deforming it and releasing the engagement between the projection 22a and the recess 32b'. As a result, the tip 22b of the engaging piece 22 descends relatively on the inclined surface 34a of the tapered rib 34, and the projection 22a overcomes the stepped portion 32b, as shown in Figure 10(b), and the elastic deformation of the engaging piece 22 returns to its original state.

[0073] In other words, by biasing the engaging piece 22 toward the refill body 30, the engagement between the projection 22a and the recess 32b' is released, and the refill container 3 rises upward due to the action of the tapered rib 34.

[0074] Subsequently, by pinching the cylindrical portion 32 (see Figure 6) of the lifted refill container 3 with your fingers, the refill container 3 can be removed from the main body 2A of the outer container 2, as shown in Figure 10(c).

[0075] In conventional products, the refill container, which is housed inside the outer container, had to be directly grasped and removed, making the removal process very difficult. In contrast, in this embodiment, the refill container 3 can be easily detached from the outer container 2 simply by applying force to the engaging piece 22, making it much easier to handle compared to conventional products.

[0076] Figure 11 is a perspective view of the refill container when sold individually, where (a) shows the container with the lid removed and (b) shows the container with the lid attached.

[0077] As described above, the refill container 3, which can be attached to and detached from the outer container 2, is provided with a lid 3A specifically for the refill container 3, as shown in Figure 11(a).

[0078] Specifically, a screw portion 3a is formed inside the lid 3A, and by screwing this screw portion 3a onto the screw portion 31 of the refill container 3, the lid 3A can be attached to the refill container 3 as shown in Figure 11(b).

[0079] In this way, the lid 3A can be attached to the refill container 3, giving the entire refill container a high-quality and attractive appearance.

[0080] It should be noted that the present invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the gist of the invention.

[0081] For example, in the above embodiment, the main body 2A of the outer container 2 is composed of a separate first outer body 20 and a first intermediate member 21, and the lid 2B is composed of a separate second outer body 26 and a second intermediate member 27, as illustrated in the example of a refill container attachment mechanism and cosmetic container. However, as shown in Figure 12, a refill container attachment mechanism and cosmetic container having a main body 2A in which the parts corresponding to the first outer body 20 and the first intermediate member 21 are integrated, and a lid 2B in which the parts corresponding to the second outer body 26 and the second intermediate member 27 are integrated, are of course also included in the scope of the present invention. [Explanation of Symbols]

[0082] 1. Cosmetic container 2 Outer container 2A Main Unit 2B Lid 3 Refill containers 3A Lid 3a Screw part (lid screw part) 20 First Exterior Body 20a Ring-shaped projection 21 First Intermediate Member 22 Engaging piece 22a Protrusion 22b Tip 23 Partial screw section 24 Flange section 24a Projection piece 26. Second Exterior Body 26a Ring-shaped projection 27 Second Intermediate Member 27a Rib 27b Seal 28 Flange section 28a protruding piece 29. Screw part (screw part of the lid) 30 Refill Body 30a Flange section 31. Screw part (screw part of refill container) 32 Cylindrical section 32a Flange section 32b Stepped section 32b' recess 32c Stepped section 33 Screw threads 34 Ribs 34a Slope G gap

Claims

1. A refill container attachment / detachment mechanism that allows a refill container, to which either a screw-type lid or a screw-type lid body of an outer container can be attached, to be installed inside the outer container and removed from the outer container, A window-shaped screw notch formed in the refill container's screw portion, which can be screwed into either the screw portion formed on the lid or the screw portion formed on the lid body, An engaging piece that rises in a tongue shape from the upper edge of the main body of the outer container, is capable of fitting into and engaging with the screw-cut portion, and has a partially threaded portion on its surface, Equipped with, When the engaging piece is fitted into the screw portion, the partially threaded portion of the engaging piece and the threaded portion of the refill container become continuous. A refillable container attachment / detachment mechanism that features the following characteristics.

2. A tapered rib that can abut against the back surface of the engaging piece is formed near the upper part of the screw notch, At least the engaging piece is formed of an elastically deformable material. The refill container attachment / detachment mechanism according to claim 1, characterized by the above.

3. The main body of the outer container comprises a first outer casing having an opening on its upper surface and a first intermediate member mounted inside the first outer casing, the first intermediate member having an opening on its upper surface and the engaging piece standing upright on its upper edge and having the partial threaded portion on its surface, The lid of the outer container is composed of a second outer body having an opening on its lower surface and a second intermediate member fitted inside the second outer body, the second intermediate member having an opening on its lower surface and a lid screw portion that can be screwed into the refill container screw portion, The refill container is formed to be housed within the first intermediate member and comprises a refill body having an opening on its upper surface, a refill container screw portion disposed to surround the upper outer circumference of the refill body, and a screw notch formed in the refill container screw portion. When the engaging piece of the first intermediate member is inserted into the threaded portion of the refill container through the gap between the refill body and the threaded portion of the refill container and engaged, the partially threaded portion of the engaging piece and the threaded portion of the refill container become continuous. A refill container attachment / detachment mechanism according to claim 1 or claim 2, characterized by the above.

4. The refill container attachment / detachment mechanism according to claim 3, characterized in that the engaging piece and the threaded portion are engaged by a projection formed below the partially threaded portion of the engaging piece and a recess provided on the lower edge of the threaded portion.

5. The tapered rib, which has an inclined surface extending from the surface of the refill body to the upper edge of the screw notch, is formed in the gap between the refill body and the screw portion of the refill container, and is located in the upper part of the screw notch. The refill container attachment / detachment mechanism according to claim 3, characterized by the above.

6. A refillable cosmetic container having an outer container and a refill container, The refill container attachment / detachment mechanism described in claim 1 is provided. A cosmetic container characterized by the following features.

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