Double container

Abstract

To prevent an inner container from floating up together with a lid body when the lid body closing an outer container is removed in a double container.SOLUTION: A double container 1 includes: an inner container 2 which is formed into a bottomed cylindrical shape and is filled with contents; an outer container 3 which is formed into a cylindrical shape and can house the inner container 2 inside; and a lid body 4 which is externally fitted to an upper opening of the outer container 3 in a spiral manner and closes an opening. The lid body 4 and the inner container 2 are provided with a floating prevention mechanism 23 preventing the inner container 2 from floating up together with the lid body 4 when the lid body 4 rotates in a lid-opening direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a double container that can prevent the inner container from floating up along with the lid that closes the outer container when the lid is rotated and removed. [Background technology]

[0002] In recent years, double-layered containers have been increasingly adopted as containers for cosmetics used in makeup applications. A double-layered container comprises an inner container for storing the contents and an outer container that detachably houses the inner container. In the case of such double-layered containers, the inner container is removable from the outer container, and after using up the contents, the user can remove the inner container from the outer container and replace it with a new inner container, thereby reusing the outer container and addressing environmental issues such as the mass disposal of plastic.

[0003] Although the use of an inner container has great advantages, it also has the following drawbacks. The inner container is fitted into the outer container from above, and the lid can be closed by screwing it onto the upper openings of the fitted inner and outer containers. When removing the contents, such as cosmetics, from the inner container, the lid is turned in the opening direction to release the screwed state, and then the lid can be removed from the outer container.

[0004] However, when the inside of the lid and the upper edge of the inner container are stuck together, removing the lid causes the inner container to rotate along with the lid, and ultimately the inner container, along with the lid, comes off the outer container. This may be caused, for example, by the fact that if the contents placed in the inner container are viscous, some of the contents may adhere to the top edge of the inner container and harden, causing the inside of the lid to stick to the top edge of the inner container.Also, when the lid is tightly closed onto the outer container (when the lid is screwed on tightly), a negative pressure is generated inside the inner container, causing the inside of the lid to stick to the top edge of the inner container.

[0005] A technique for avoiding such a situation is disclosed in Patent Document 1. Patent Document 1 discloses a double container including an outer container having a cylindrical portion with an opening at the top and a first protrusion on the circumferential surface of the cylindrical portion along an axial direction passing through the center of the opening, an inner container having a second protrusion that fits with the first protrusion of the outer container along the axial direction and is inserted into the outer container so that its movement in a direction rotating about the axial line is restricted by the fit between the first protrusion and the second protrusion, and a lid that screws onto the outer container to seal the inner container, in which the length of the second protrusion in the axial direction is at least twice the spacing of the threads on the lid. With this double container, even though the airtightness inside the container is increased, when opening the lid, the top of the inner container can be reliably separated from the lid while the inner container is inserted into the outer container. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-129724 Summary of the Invention [Problem to be solved by the invention]

[0007] In the double container disclosed in Patent Document 1, a first protrusion is provided on the outer peripheral surface of the outer container, and a second protrusion is provided on the inner container, and the engagement between these first and second protrusions restricts the inner container from rotating around its vertical axis. This makes it possible to prevent the inner container from rotating together with the lid when the lid is removed, resulting in the inner container coming off the outer container.

[0008] However, when considering applying the technology of Patent Document 1 to an actual product, for example, if the outer container is made of a material such as glass, even if the first protrusion is formed on the glass, dimensional accuracy is often not achieved, and there is a high possibility that the desired anti-rotation effect will not be achieved. Furthermore, if the first protrusion or second protrusion becomes smaller than the predetermined size due to wear or the like, the anti-rotation function will not be achieved, and the inner container will float up.

[0009] In view of the above problems, the present invention aims to provide a double container that prevents the inner container from floating up along with the lid that closes the outer container when the lid is removed. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides the following technical means. In other words, the double container of the present invention comprises an inner container in which the contents are filled, an outer container in which the inner container can be accommodated, and a lid that is screwed onto the top opening of the outer container to close the top opening, and is characterized in that the lid and inner container are provided with a lift-up prevention mechanism that prevents the inner container from lifting up along with the lid when the lid is rotated in the opening direction.

[0011] Preferably, the anti-floating mechanism has a pressing portion provided on the inside of the peripheral wall portion of the lid body, and an inner container protrusion provided on the side wall of the inner container so as to abut against the pressing portion, and is configured so that when the lid body is rotated in the opening direction, the pressing portion prevents the inner container from moving upward. Preferably, the anti-floating mechanism has an outer container engaging portion that is convexly provided on the outer container and an inner container engaging portion that is convexly formed on the inner container, and when the lid body is rotated in the lid-opening direction, the inner container engaging portion engages with the outer container engaging portion from below, thereby restricting the inner container from moving upward.

[0012] Preferably, a pressing protrusion is formed on the lid body to press the inner container engaging portion toward the outer container engaging portion in order to strengthen the engagement between the outer container engaging portion and the inner container engaging portion. [Effects of the Invention]

[0013] According to the double container of the present invention, when the lid that closes the outer container is removed, the inner container can be reliably prevented from floating up along with the lid. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a diagram showing a cross-sectional structure of the double container of the first embodiment. [Figure 2] FIG. 2 is a perspective view of the cover of the first embodiment as viewed from below. [Figure 3] 1 is a schematic diagram showing the state in which the lid body is being removed in the double container of the first embodiment, where (a) is the closed state, (b) is the initial rotation state in which the lid body is turned and the screwed state is slightly released, and (c) is the state in which the unscrewing has progressed and the upper end of the inner container has come off the lid body. [Figure 4] FIG. 10 is a diagram showing a cross-sectional structure of a double container according to a second embodiment. [Figure 5] FIG. 10 is a diagram showing a cross-sectional structure of a double container according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of a double container according to the present invention will be described with reference to the drawings. In the following description, a double container used as a cosmetic container for cosmetics will be used as an example. However, the double container of the present invention is not limited to cosmetic containers and can also be used as a container for other products such as supplements. [First embodiment] As shown in Figure 1, the double container 1 of this embodiment is composed of an inner container 2 (refill container) formed in a cylindrical shape with a bottom, an outer container 3 in which the inner container 2 is stored, and a lid 4 that covers and seals an opening formed at the top of the inner container 2 and an opening formed at the top of the outer container 3.

[0016] 1 and 2, the outer container 3 is formed in a cylindrical shape with a bottom, and the inner container 2 is configured to be fitted from above into the outer container 3. In this embodiment, the inner diameter of the outer container 3 is formed to be approximately the same as the outer diameter of the inner container 2, and is circular in plan view. More specifically, the outer container 3 has a cylindrical body 5S with a bottom that houses the inner container 2 therein, and an engaging tubular part 8 provided at the top of the body 5S. The body 5S has a plate-shaped (disk-shaped, polygonal plate-shaped, elliptical plate-shaped, etc.) bottom 7A and an outer tubular part 7B provided so as to surround the bottom 7A. The top of the outer tubular part 7B is open, and the engaging tubular part 8 is formed so as to surround this opening.

[0017] The lower side of the engaging cylindrical portion 8 is a lid engaging portion 9 that engages with the lid body 4, and has an outer diameter smaller than that of the outer cylindrical portion 7B. A male thread portion 10 is provided around the outer wall of the lid engaging portion 9. The male thread portion 10 is threadedly engaged with a female thread portion 11 provided on the inside of the lid body 4, which will be described later, to maintain the airtightness of the double container 1 and enable the lid body 4 to be attached and detached to the outer container 3.

[0018] The upper side of the engaging cylindrical part 8 is an inner-container engaging part 12 that engages with the inner container 2. The inner-container engaging part 12 is shaped like a short cylindrical ring, and the inner container 2 is fixed to the outer container 3 by fitting a folded-back part of the inner container 2 (described later) into this inner-container engaging part 12. The inner-container engaging part 12 has a smaller outer diameter than the lid engaging part 9, and naturally, also has a smaller outer diameter than the outer cylinder part 7B. However, the inner walls of the outer cylinder part 7B, the lid engaging part 9, and the inner-container engaging part 12 are flush with each other, and all of these inner walls have the same diameter, which is larger than the outer diameter of the inner cylinder part 13B of the inner container 2.

[0019] Due to this configuration, when the inner container 2 is fitted downward from the opening of the outer container 3, the outer wall of the inner cylindrical portion 13B of the inner container 2 and the inner wall of the outer cylindrical portion 7B of the outer container 3 come into contact or a slight gap is formed, preventing the inner container 2 from tilting or rattling relative to the outer cylindrical portion 7B of the outer container 3. The inner container 2 is replaceable and contains liquid, semi-solid, or paste-like cosmetics. The inner container 2 has a cylindrical body 5N with a bottom that contains cosmetics. The body 5N is integrally formed with a plate-shaped (disk-shaped, elliptical, polygonal, etc.) bottom 13A and an inner cylindrical portion 13B that surrounds the bottom 13A, and has a certain depth to contain a predetermined amount of cosmetics.

[0020] A flange 14 is provided on the upper edge of the inner cylindrical portion 13B so as to project outward from the inner cylindrical portion 13B. A hanging wall 15 hangs downward from the tip of the flange 14 in a skirt-like shape. Therefore, a folded portion is formed at the top of the inner container 2 by the flange 14 and the hanging wall 15, and a fitting gap is formed inside the hanging wall 15 so as to correspond to the width of the flange 14. This fitting gap fits into the inner-container engaging portion 12 described above from above.

[0021] In the inner container 2 of this embodiment, as in other embodiments described later, an outer container engaging portion 8A formed to protrude outward is provided immediately below the flange 14 of the inner container 2. This outer container engaging portion 8A is adapted to engage with an inner container engaging portion 8B provided on the inside of the hanging wall of the inner container 2. 1, the vertical dimension of the inner container 2 is approximately the same as the vertical dimension of the internal space of the outer container 3. In other words, the dimension from the underside of the flange 14 of the inner container 2 to the underside of the bottom 13A of the inner container 2 is approximately the same as the dimension from the upper end of the inner-container engaging portion 12 of the outer container 3 to the upper surface of the bottom 7A. Note that there is no problem if the vertical dimension of the inner container 2 is shorter than the vertical dimension of the internal space of the outer container 3.

[0022] At two positions on the hanging wall of the inner container 2 (positions facing each other at a phase difference of 180°), inner-container rotation-preventing pieces 20 are formed hanging further below the hanging wall 15. The length of the inner-container rotation-preventing pieces 20 is about three times the length (hanging length) of the hanging wall 15, and the lower end of the inner-container rotation-preventing pieces 20 reaches the upper end of the body portion 5S of the outer container 3, i.e., the upper end of the outer cylindrical portion 7B. There are no limitations on the width (length along the circumference) of the inner-container rotation-preventing pieces 20, but in this embodiment, it is set to be approximately the same as the width of the fingers of a user trying to grip the inner container 2.

[0023] Meanwhile, concave vertical grooves 21 into which the aforementioned inner-container rotation-preventing piece 20 slides from above are formed at two positions on the engaging cylindrical portion 8 of the outer container 3. Because the concave vertical grooves 21 are open at the top, the inner-container rotation-preventing piece 20 slides in from above. The left end of the concave vertical groove 21 is in contact with or adjacent to the left end of the inner-container rotation-preventing piece 20 with a small gap. The right end of the concave vertical groove 21 is in contact with or adjacent to the right end of the inner-container rotation-preventing piece 20 with a small gap.

[0024] Therefore, even if the inner container 2 is rotated around the vertical axis inside the outer container 3, the inner-container rotation-preventing piece 20 and the concave vertical groove 21 engage with each other, restricting the rotation of the inner container 2. In this sense, the concave vertical groove 21 formed in the outer container 3 can be called the outer-container rotation-preventing portion 21. A protrusion (inner-container protrusion 22) extending in a strip shape along the circumferential direction is formed on the base end (upper end) of the inner-container rotation-preventing piece 20 of the inner container 2. This inner-container protrusion 22 not only acts as a catch for the user's fingers when picking and pulling out the inner container 2 from the outer container 3, but also has an important function as a part of the lift-up prevention mechanism 23 described below.

[0025] As shown in FIGS. 1 and 2, in this embodiment, a lid 4 is provided which is screwed onto the outer container 3 to close the upper openings of the outer container 3 and the inner container 2. The lid body 4 has a disk-shaped top wall 16 that is provided so as to be in contact with the surfaces of the openings formed at the top of the outer container 3 and the inner container 2, and a cylindrical peripheral wall 17 that hangs down from the edge of the top wall 16. The peripheral wall 17 is long enough in the vertical direction to cover the lid engaging portion 9 of the outer container 3 and engage with the lid engaging portion 9 provided on the outer container 3. A male thread 10 is provided around the outer wall of the lid engaging portion 9. The male thread 10 threadably engages with a female thread 11 provided in the lid body 4, thereby maintaining the airtightness of the double container 1 and enabling the lid body 4 to be attached and detached to the outer container 3.

[0026] The aforementioned female thread portion 11 is formed around the entire periphery of the inner wall of the peripheral wall portion 17, and the male thread portion 10 formed on the outer wall of the lid engagement portion 9 and the female thread portion 11 are threaded together. Therefore, by turning the lid body 4 in a horizontal plane and threading the male thread portion 10 and the female thread portion 11 together, the lid body 4 can be attached to the outer container 3, and the airtightness of the double container 1 can be maintained. In addition, in order to make the seal provided by the lid body 4 stronger, a gasket 18 is placed on the underside of the top wall portion 16 of the lid body 4, and the inner container 2 is sealed by the gasket 18 coming into contact with at least the upper end of the inner container 2 (the upper surface of the flange portion 14).

[0027] As materials for the outer container 3, inner container 2, and lid 4 described above, for example, synthetic resin materials such as PET are suitable, but metal materials such as aluminum can also be used. The outer container 3 may be made of a transparent or translucent synthetic resin material. The inner container 2 may be made of a colored synthetic resin material, or a transparent synthetic resin material whose outer surface is decorated with a glossy finish by surface treatment. It is also desirable that the colors of the outer container 3, inner container 2, and lid 4 can be adjusted to match the design, and in addition to coloring or coloring, decorative materials may be mixed in. The outer container 3, inner container 2, and lid 4 may be molded, for example, by injection molding.

[0028] The double container 1 of this embodiment is equipped with a "floating prevention mechanism 23" that prevents the inner container 2 from floating up along with the lid body 4 when the lid body 4 that closes the outer container 3 is rotated and removed. This lift-up prevention mechanism 23 is composed of an inner-container protrusion 22 provided on the base end side of the inner-container rotation prevention piece 20 of the inner container 2, and a pressing part (inclined pressing part) 24 formed inside the peripheral wall part 17 of the lid body 4, above the female thread part 11. This pressing part 24 is formed in a position just below the packing 18 provided on the inside of the lid body 4.

[0029] The inner-container protrusion 22 has a length (circumferential length) sufficient for a user's finger to fit over it, and has a circumferential width of, for example, about 1 cm. The lower edge of the inner-container protrusion 22 is linear and faces horizontally, and the upper edge of the inner-container protrusion 22 is arc-shaped and bulges upward. The retaining portion 24 is an inclined surface having the same inclination angle as the female thread portion 11, and protruding outward by approximately the same amount as the male thread portion 10. As shown in Figure 3, this inclined surface rises to the right at the same angle as the female thread portion 11, and has an upward pitch approximately equal to the vertical width of the inner-container protrusion 22 when it makes one revolution along the lid 4. The lowest and highest points of the retaining portion 24 are 360° apart in phase, so that they reach the same position in the vertical direction. Therefore, the lowest and highest points of the retaining portion 24 are connected by a cliff (see Figure 3(c) described below).

[0030] FIG. 3 shows the process of turning the lid 4 to the open state. 3(a) shows the state in which the lid 4 is securely fastened to the outer container 3. At this time, the relationship between the male thread portion 10 and the female thread portion 11 is such that there is no gap between the lower end surface of the male thread portion 10 and the upper end surface of the female thread portion 11, so the lid 4 is in a state in which it cannot move upward (a tightly fastened state). At this time, the retaining portion 24 formed on the lid 4 and the upper surface (arcuate surface) of the inner-container protrusion 22 are not in contact with each other.

[0031] 3(a), when the lid 4 is completely closed (the lid 4 does not move up or down at all), the gasket 18 of the lid 4 is in contact with the upper edge of the inner container 2, so the lid 4 does not move downward. At this time, the retaining portion 24 is not in contact with the upper end of the inner container protrusion 22. Thereafter, the cover 4 is rotated to the unlocked state.

[0032] 3(b) shows the initial rotation when opening the lid 4. The initial rotation indicates the state in which the lid 4 has been rotated by about 20°. However, the angle at the time of the initial rotation will vary depending on the design, such as the vertical gap dimensions between the male thread portion 10 and the female thread portion 11. In this state, as shown in Figure 3(b), a gap is created between the lower end surface of the male thread portion 10 and the upper end surface of the female thread portion 11, and looking towards the lid 4, the retaining portion 24 has moved and is now in contact with the arcuate surface of the inner-container protrusion 22. Then, a downward force from the retaining portion 24 acts on the inner-container protrusion 22, pressing the inner container 2 downward.

[0033] 3(b), when the lid 4 is rotated slightly in the open direction, the pressing portion 24 comes into contact with the upper end of the pressing protrusion 25 and starts to apply pressure downward. At this time, the height of the lid 4 remains unchanged. Figure 3(c) shows the state in which the lid 4 has been further rotated toward the open position from the state in Figure 3(b). Continuing to rotate the lid 4 in this manner causes the female thread portion 11 of the lid 4 to move upward along the male thread portion 10 formed on the engaging tube portion 8 of the outer container 3. This causes the retaining portion 24 of the lid 4 to further press the inner-container protrusion 22 downward, causing the contact surfaces between the packing and the inner container 2 to separate. If the contact surfaces are stuck, a separating force is applied. Consequently, when the lid 4 closing the outer container 3 is removed, the inner container 2 is prevented from floating up along with the lid 4.

[0034] That is, as shown in Figure 3(c), when the lid 4 is further rotated from the initial rotation shown in Figure 3(b), the pressing portion 24 continues to come into contact with the upper end of the pressing protrusion 25 and press downward, pushing the inner container 2 downward and preventing the inner container 2 from floating up, as shown in Figure 3(c), and as the lid 4 rises further, a gap is created between the packing 18 and the inner container 2, eliminating the pressure difference between the inside and outside of the inner container 2 and preventing the inner container 2 from floating up. As described above, according to the double container 1 of the first embodiment, when the lid 4 closing the outer container 3 is removed, the inner container 2 can be reliably prevented from floating up along with the lid 4. [Second embodiment] Next, a second embodiment of the present invention will be described.

[0035] In the second embodiment, the position of the inner-container protrusion 22 formed on the inner-container rotation preventing piece 20 is significantly different from that of the first embodiment. However, the other configurations are substantially the same as those of the first embodiment. 4, the lift-up prevention mechanism 23 of the second embodiment has an inner-container protrusion 22 provided at the lower end of the inner-container rotation preventing piece 20 of the inner container 2, and a pressing part 24 formed inside the peripheral wall 17 of the lid 4, below the female thread part 11. In other words, this pressing part 24 is formed on the lower end side of the peripheral wall 17 of the lid 4.

[0036] The inner-container protrusion 22 has a length sufficient for a user's fingers to catch on, and is, for example, approximately 1 cm wide in the circumferential direction. The lower edge of the inner-container protrusion 22 is linear and faces horizontally, and the upper edge of the inner-container protrusion 22 is arc-shaped and bulges upward. The retaining portion 24 is an inclined surface having the same angle as the inclination angle of the female thread portion 11. As shown in FIG. 5, this inclined surface rises to the right at the same angle as the inclination angle of the female thread portion 11, and has an upward pitch approximately equal to the vertical width of the inner-container protrusion 22 when it makes one revolution along the lid 4. The lowest and highest positions of the retaining portion 24 are 360° apart in phase, so that they reach the same position in the vertical direction. Therefore, the lowest and highest positions of the retaining portion 24 are connected by a cliff. The retaining portion 24 is formed in a region below the region where the female thread portion 11 is formed, at a position corresponding to the inner-container protrusion 22.

[0037] Even with the lift-up prevention mechanism 23 configured as described above, when the lid 4 is tightly fastened to the outer container 3, there is no gap between the lower end surface of the male thread portion 10 and the upper end surface of the female thread portion 11, and the lid 4 does not move upward. At this time, the retaining portion 24 formed on the lid 4 and the upper surface (arcuate surface) of the inner-container protrusion 22 are not in contact with each other.

[0038] The lid 4 is then rotated to the released state. In this state, as in the first embodiment, a gap is created between the lower end surface of the male thread portion 10 and the upper end surface of the female thread portion 11, and looking towards the lid 4, the retaining portion 24 has moved and is now in contact with the arcuate surface of the inner-container protrusion 22. A downward force is then applied from the retaining portion 24 to the inner-container protrusion 22, pressing the inner container 2 downward.

[0039] When the lid 4 is further rotated toward the open position, the female thread portion 11 of the lid 4 moves upward along the male thread portion 10 formed on the engaging cylindrical portion 8 of the outer container 3. Then, the retaining portion 24 of the lid 4 presses the inner container protrusion 22 downward, separating the contact surfaces of the packing 18 and the inner container 2. Consequently, when the lid 4 closing the outer container 3 is removed, the inner container 2 is prevented from floating up along with the lid 4. [Third embodiment] Next, a third embodiment of the present invention will be described.

[0040] The floating prevention mechanism 23 in the third embodiment is significantly different in configuration from the floating prevention mechanism 23 in the first and second embodiments. As shown in Figure 5, the anti-floating mechanism 23 in the third embodiment has a convex outer container engagement portion 8A and a convex inner container engagement portion 8B formed continuously below the convex portion into which the outer container engagement portion 8A fits.

[0041] The outer container engaging portion 8A is provided on the outer surface of the engaging tube portion 8 of the outer container 3 so as to protrude outward. A recess into which the outer container engaging portion 8A fits when the inner container 2 is fitted into the outer container 3 is formed on the inside of the hanging wall 15 of the inner container 2, and a convex inner container engaging portion 8B is formed below and facing inward, continuing from the recess. When the lid 4 is rotated in the opening direction, even if the upper end of the inner container 2 comes into contact with the inside of the lid 4 and tries to rise up along with it, the upper surface of the inner-container engaging portion 8B comes into contact with and catches the lower surface of the outer-container engaging portion 8A, restricting the rise of the inner container 2. As a result, the inner container 2 can be reliably prevented from floating up along with the lid 4.

[0042] Furthermore, when the inner container 2 attempts to lift up in conjunction with the lid 4, the inner-container rotation stopper 20 of the inner container 2 may spread outward, potentially releasing the engagement between the outer-container engagement portion 8A and the inner-container engagement portion 8B. To avoid this situation, a holding protrusion 25 is formed on the inside of the peripheral wall 17 of the lid 4, at a position to the side of the inner-container protrusion 22. This holding protrusion 25 presses down on the inner-container protrusion 22 from the side, preventing the inner-container rotation stopper 20 from spreading outward and ultimately ensuring the engagement between the outer-container engagement portion 8A and the inner-container engagement portion 8B. This reliably prevents the inner container 2 from floating up along with the lid 4 when the lid 4 closing the outer container 3 is removed.

[0043] Regarding the relationship between position X of the outer container engaging portion 8A and the inner container engaging portion 8B and position Y of the pressing protrusion 25, it is preferable that positions X and Y are located at approximately the same horizontal position. Furthermore, although position X is located vertically, it may be located at the base end (upper end) of the inner container rotation prevention piece 20, or at the tip end (lower end) of the inner container rotation prevention piece 20. Regardless of the position, the upper surface of the inner container engaging portion 8B comes into contact with and catches on the lower surface of the outer container engaging portion 8A, restricting the rise of the inner container 2. This in turn reliably prevents the inner container 2 from floating up along with the lid 4.

[0044] It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. In particular, in the embodiments disclosed herein, matters not explicitly stated, such as operating conditions, control conditions, dimensions and weights of components, etc., do not deviate from the scope of what a person skilled in the art would normally do, and are matters that a person skilled in the art would easily be able to imagine. [Explanation of symbols]

[0045] 1 double container 2 Inner container 3 Outer container 4 Lid 5N Body of inner container 5S Body of outer container 7A Bottom of outer container 7B Outer cylinder 8 Engagement tube 8A Outer container engagement part 8B Inner container engagement part 9 Lid engagement part 10 Male thread 11 Female thread 12 Refill engagement tube 13A Bottom of inner container 13B Inner cylinder part 14 Tsuba 15 Hanging wall 16 Ceiling wall 17 Peripheral wall section 18 Packing 20 Container rotation stopper 21 Outer container rotation stopper (vertical groove) 22 Convex part of inner container 23 Anti-floating mechanism 24 Presser foot 25 Presser protrusion

Claims

1. A double container comprising an inner container filled with contents, an outer container capable of accommodating the inner container therein, and a lid that is screwed onto an upper opening of the outer container to close the upper opening, The lid body and the inner container are provided with a lift-up prevention mechanism that prevents the lid body from directly pressing the inner container and lifting up when the lid body is rotated in the lid-opening direction, When the inner container is housed in the outer container, a part of the outer wall of the inner container engages with a vertical groove recessed in a part of the outer wall of the outer container to act as an inner-container rotation stopper that restricts rotation of the inner container, and a male screw portion provided on the outer wall of the outer container other than the part where the inner-container rotation stopper is exposed and a female screw portion provided on the inner wall of the lid change their threaded engagement state, thereby switching between the closed and open states of the upper opening, the lift-up prevention mechanism includes an inner-container protrusion provided on the inner container and a lid body pressing portion provided on the lid body, the inner-container protrusion protrudes outward from the inner-container rotation preventing piece at a position higher than the height position of the male screw portion, and the lid body pressing portion protrudes downward from the inner peripheral wall of the lid body at a position higher than the female screw portion, In the closed state, the lid holder does not come into contact with the inner container protrusion, and when the lid transitions from the closed state to the open state, the lid holder directly presses the inner container protrusion downward, thereby restricting the inner container from moving upward. A double container characterized by:

2. A double container comprising an inner container filled with contents, an outer container capable of accommodating the inner container therein, and a lid that is screwed onto an upper opening of the outer container to close the upper opening, The lid body and the inner container are provided with a lift-up prevention mechanism that prevents the lid body from directly pressing the inner container and lifting up when the lid body is rotated in the lid-opening direction, A part of the outer peripheral wall of the inner container is formed into a concave vertical groove as an inner container rotation stopper piece that restricts rotation of the inner container when the inner container is housed in the outer container. the outer container engages with the male thread portion provided on the outer peripheral wall of the outer container other than the portion where the inner-container rotation preventing piece is exposed, and the female thread portion provided on the inner peripheral wall of the lid changes its threaded engagement state, switching the upper opening between closed and open states; the lift-up prevention mechanism includes an inner-container protrusion provided on the inner container and a lid body pressing portion provided on the lid body, the inner-container protrusion protrudes from the inner-container rotation preventing piece toward the outer periphery at a position lower than the height position of the male screw portion, and the lid body pressing portion protrudes downward from the inner periphery wall of the lid body at a position lower than the female screw portion, In the closed state, the lid holder does not come into contact with the inner container protrusion, and when the lid transitions from the closed state to the open state, the lid holder directly presses the inner container protrusion downward, restricting the inner container from moving upward. A double container characterized by:

3. the anti-floating mechanism has an outer-container engaging portion provided in a convex shape on the outer container and an inner-container engaging portion formed in a convex shape on the inner container, When the lid is rotated in the lid-opening direction, the inner-container engaging portion engages with the outer-container engaging portion from below, thereby restricting the inner container from moving upward. The double container according to claim 1 or 2.

4. In order to strengthen the engagement between the outer container engaging portion and the inner container engaging portion, a pressing protrusion that presses the inner container engaging portion toward the outer container engaging portion is formed on the lid. The double container according to claim 3 .

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