Double container

Abstract

To provide a double container that allows easy separation of an inner container from an outer container.SOLUTION: A double container consists of a bottomed cylindrical inner container 11 and a cylindrical outer container 12 into which the inner container 11 is detachably attached, a window part 22A that opens upward is formed in a surrounding cylinder part 22 of the inner container 11, the surrounding cylinder part 22 is arranged in the window part 22A, and has a projecting piece 42 that is supported to be deformable radially inward of the surrounding cylinder part 22, a locking projection part 44A is formed on a radially outer surface of the projecting piece 42, and an inner circumferential surface of the outer container 12 has formed therein a locking projection storage recess 75 that is locked to the locking projection part 44A from above the locking projection part 44A and restricts an upward movement of the inner container 11 with respect to the outer container 12.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a double container. [Background technology]

[0002] A known example of this type of double container is one that includes a cylindrical inner container with a bottom and a cylindrical outer container to which the inner container is detachably attached, with the inner container functioning as a refill container (see, for example, Patent Document 1). This double container uses a fixing ring to fix the inner container housed within the outer container. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-172426 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such double containers, the inner container is fixed to the outer container using a fixing ring that is a separate part from the inner and outer containers, so the fixing ring must be removed in order to replace the inner container, which is a refill container.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a double container that allows the inner container to be easily separated from the outer container. [Means for solving the problem]

[0006] The present invention employs the following means to solve the above problems: That is, the double container of the present invention comprises a cylindrical inner container with a bottom, a cylindrical outer container to which the inner container is detachably attached, and an outer peripheral wall of the inner container having a window portion that opens upward, the outer peripheral wall having a protruding piece that is disposed in the window portion and supported so as to be deformable radially inward relative to the outer peripheral wall, a lower end edge of the protruding piece portion is connected to a portion of the outer peripheral wall portion that defines a lower end edge of the window portion,A first locking portion is formed on the radial outer surface of the protruding piece, and a second locking portion is formed on the inner surface of the outer container, which locks onto the first locking portion from above the first locking portion and prevents the inner container from moving upward relative to the outer container.

[0007] In this invention, when the inner container is attached to the inside of the outer container, the first locking portion of the inner container locks onto the second locking portion of the outer container from below the second locking portion, restricting the inner container from moving upward relative to the outer container. This prevents the inner container from unintentionally detaching from the outer container and separating from the outer container. Meanwhile, when the protruding portion of the inner container is elastically deformed radially inward, the locked state between the first locking portion and the second locking portion is released. Here, because the window portion opens upward, it is easy to hook a finger on the upper end of the protruding portion when elastically deforming the protruding portion radially inward. This makes it possible to detach the inner container from the outer container and easily separate the inner container from the outer container. In addition, because the first locking portion of the protruding piece, which elastically deforms in the radial direction, is locked to the second locking portion, a separate component such as a fixing ring for fixing the inner container to the outer container is not required, compared to the conventional double-walled container described above. Furthermore, there is no need to thicken the outer container to provide such a fixing mechanism, simplifying the configuration of the outer container. Furthermore, because the first locking portion of the protruding piece, which elastically deforms in the radial direction, is locked to the second locking portion, the attachment strength is less susceptible to variations due to changes in the degree of shrinkage of the inner and outer containers during molding, caused by colorants added to the inner and outer containers, compared to a configuration in which the inner container is attached to the outer container by fitting the inner container inside the outer container. Therefore, the inner container can be easily attached to the inside of the outer container even when colored in various colors.

[0008] In addition, in the double container of the present invention, a first regulating portion may be formed in the inner container, and a second regulating portion may be formed in the outer container that engages with the first regulating portion in the circumferential direction and regulates circumferential movement of the inner container relative to the outer container. In this invention, the circumferential movement of the inner container relative to the outer container is restricted, so that relative circumferential movement and rattle between the inner and outer containers can be more reliably suppressed when the outer container is attached to the inner container. In particular, when the inner container is configured to be screwed onto the inner container by a lid that is detachably attached to the double container, the inner container can be more reliably suppressed from rotating together with the lid. Here, even if a circumferential force is applied to the inner container when the inner container is attached inside the outer container, the first restricting portion, which is circumferentially engaged with the second restricting portion of the outer container, receives this circumferential force, thereby suppressing the application of this circumferential force to the protruding piece that is elastically deformable in the radial direction.

[0009] In the double container of the present invention, the protruding piece may be biased radially outward. In this invention, the protruding piece is biased radially outward so as to maintain the locked state between the first locking portion and the second locking portion, and this prevents the locked state between the first locking portion and the second locking portion from being unintentionally released, thereby more reliably maintaining the inner container attached to the outer container.

[0010] In the double container of the present invention, the upper end of the radially outer surface of the protruding piece may be open to the outside relative to the inner circumferential surface of the outer container. In this invention, when separating the inner container from the outer container, it is easy to hook a finger or the like onto the protruding piece, and the protruding piece can be easily elastically deformed radially inward.

[0011] In the double container of the present invention, the inner container may be formed with a detent projection that can be engaged from the radially outer side with the protruding piece that has been deformed radially inward. In this invention, the protruding pieces elastically deformed radially inward when separating the inner container from the outer container are restricted from deforming radially outward, making it easier to separate the inner container from the outer container, which is particularly useful when the protruding pieces are biased radially outward. [Effects of the Invention]

[0012] According to the double container of the present invention, the inner container can be detached from the outer container by elastically deforming the protruding piece radially inward to release the engagement between the first and second locking parts, and the inner container can be easily separated from the outer container. Here, because the window part opens upward, the protruding piece can be easily elastically deformed radially inward by hooking a finger on the upper end of the protruding piece. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an axial cross-sectional view showing a double container and a lid according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the inner container of FIG. 1. [Figure 3] FIG. 2 is a side view showing the inner container of FIG. [Figure 4] FIG. 2 is a partially enlarged perspective view showing the inner container of FIG. 1. [Figure 5] FIG. 2 is a partially enlarged perspective view showing an inner container for explaining the double container of FIG. 1. [Figure 6] FIG. 2 is a perspective view showing the outer container of FIG. 1. [Figure 7] 2 is an axial cross-sectional view showing the outer container of FIG. 1, taken in a direction different from that of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, one embodiment of the double container according to the present invention will be described with reference to the drawings. 1, a double container 1 according to this embodiment has a topped cylindrical lid 2 that is detachably screwed to form a container body 3. This double container 1 includes a bottomed cylindrical inner container 11 and a bottomed cylindrical outer container 12 to which the inner container 11 is detachably attached. The inner container 11 and outer container 12 are arranged so that their central axes are coaxial. Hereinafter, this common axis will be referred to as the container axis O, with the direction from the bottom of the inner container 11 toward the opening being referred to as the upward direction and the opposite direction being referred to as the downward direction. Furthermore, the direction intersecting the container axis O in a plan view as seen from the container axis O will be referred to as the radial direction, and the direction going around the container axis O will be referred to as the circumferential direction.

[0015] The inner container 11 is made of, for example, polypropylene. As shown in Figures 1 to 5, the inner container 11 has a cylindrical container body 21 with a bottom, a cylindrical surrounding tube portion (outer peripheral wall portion) 22 that radially surrounds the container body 21, and an annular connecting portion 23 that connects the container body 21 and the surrounding tube portion 22. The container body 21, the surrounding tube portion 22, and the annular connecting portion 23 are arranged coaxially with the container axis O. Note that Figures 2 and 3 show perspective views of the inner container 11 removed from the outer container 12, and show protruding pieces 42 (described later) of the inner container 11 that are biased radially outward and restored to their original shape radially outward.

[0016] The container body 21 has a bottom wall 31 which is a circular plate-like member in a plan view, and a cylindrical tube wall 32 which extends upward from the outer periphery of the bottom wall 31. The bottom wall 31 and the tube wall 32 are arranged coaxially with the container axis O. The bottom wall portion 31 is located above the lower edge of the surrounding tube portion 22 . A male screw portion 32A is formed on the outer peripheral surface of the portion of the cylindrical wall portion 32 that protrudes above the surrounding cylindrical portion 22, to which the lid body 2 is detachably screwed.

[0017] A flange portion 41 protruding radially outward is formed at the upper end of the surrounding tube portion 22 around the entire circumference, excluding a portion of the surrounding tube portion 22 where a window portion 22A (described later) is formed. Furthermore, in a portion of the surrounding tube portion 22 that protrudes above the annular connecting portion 23, a window portion 22A that opens upward is formed on both sides of the container axis O in the radial direction in a plan view. The window portion 22A has a rectangular shape when viewed radially, and extends in the vertical direction over the portion of the surrounding tube portion 22 that protrudes above the annular connecting portion 23. A protrusion 42 that is elastically deformable radially inward relative to the surrounding tube portion 22 is disposed in the window portion 22A of the surrounding tube portion 22. The protrusion 42 is a plate-like member that is rectangular when viewed radially, and the lower edge of the protrusion 42 is connected to a portion of the surrounding tube portion 22 that defines the lower edge of the window portion 22A. Gaps are formed between both circumferential edges of the protrusion 42 and a portion of the surrounding tube portion 22 that defines the circumferential edge of the window portion 22A.

[0018] The protrusion 42 has a lower protrusion portion 43 whose radial width gradually increases from the lower end toward the top, and an upper protrusion portion 44 that extends upward from the lower protrusion portion 43 and has a substantially constant radial width. The circumferential width of the protrusion 42 is substantially constant over the entire length in the vertical direction. A locking protrusion (first locking portion) 44A protruding radially outward is formed on the radially outer surface of the lower end of the protruding piece upper portion 44. The lower surface of the locking protrusion 44A is inclined gradually upward from the radially inner end toward the radially outward, and the upper surface of the locking protrusion 44A extends substantially in the radial direction.

[0019] Furthermore, a recess 44B recessed radially inward from the radial outer surface is formed in a portion of the protrusion upper portion 44 above the locking protrusion 44A, so that the protrusion upper portion 44 has a U-shape that opens radially outward in top view, and the radial outer surface of the protrusion upper portion 44 is open to the outside. Furthermore, protruding claws 45 that protrude circumferentially outward are formed on both circumferential end surfaces of the protruding piece upper portion 44. The protruding claws 45 are thin plates extending in the vertical direction, and the upper surfaces of the protruding claws 45 are slightly inclined downward from the base end to the tip end in the circumferential direction, while the lower surfaces of the protruding claws 45 extend substantially in the circumferential direction. Furthermore, the radial outer and inner surfaces of the protruding claws 45 are inclined radially outward from the base end to the tip end in the circumferential direction.

[0020] A restricting recess 51 recessed circumferentially and radially inward is formed at the upper end of the portion of the surrounding tube portion 22 that defines both end edges of the window portion 22A. This restricting recess 51 accommodates the protruding claw portion 45 in top view. Furthermore, a detent projection 52 is formed in the portion of the surrounding tube portion 22 that defines the restricting recess 51, projecting circumferentially inward toward the other opposing peripheral end. The detent projection 52 projects circumferentially from a radially intermediate portion of the portion of the surrounding tube portion 22 that defines the restricting recess 51 and extends the entire length of the restricting recess 51 in the up-down direction. The radially outward surface of the detent projection 52 is inclined radially outward from the circumferential base end toward the distal end, while the radially inward surface of the detent projection 52 extends substantially along the circumferential direction. As shown in FIG. 4 , the detent projection 52 is engaged or can be engaged with the radial inner surface of the protruding claw portion 45 of the protruding piece portion 42 from the radially outward direction, preventing the protruding claw portion 45 from unintentionally elastically deforming radially outward.

[0021] Furthermore, a restricting protrusion 53 is formed in the portion of the surrounding tube portion 22 that defines the restricting recess 51, protruding radially inward from the restricting recess 51 toward the other opposing peripheral end portion in the circumferential direction. The restricting protrusion 53 protrudes circumferentially inward from the detent protrusion 52, and the vertical length of the restricting protrusion 53 is equal to the vertical length of the window portion 22A. Furthermore, radial rib portions (first restriction portions) 54 that protrude radially outward are formed in portions of the surrounding cylindrical portion 22 that define both peripheral edge portions of the window portion 22A. The radial rib portions 54 are formed in positions of the surrounding cylindrical portion 22 that are spaced apart circumferentially outward from the window portion 22A, and the vertical length of the radial rib portions 54 is equal to the vertical length of the window portion 22A. The position in the up-down direction of the portion of the annular connecting portion 23 where the window portion 22A is formed is different from that of the other portions of the annular connecting portion 23.

[0022] 2 and 3, the inner container 11 is formed with the protruding pieces 42 inclined radially outward as they extend upward from the lower edge. When the inner container 11 is attached to the inside of the outer container 12, the protruding pieces 42 are elastically deformed radially inward from the lower edge of the protruding pieces 42. Therefore, when the inner container 11 is attached to the inside of the outer container 12, the protruding pieces 42 are biased radially outward.

[0023] The outer container 12 is made of, for example, polyethylene terephthalate. The outer container 12 may be made of the same material as the inner container 11 or a different material. As shown in Figures 1, 6 and 7, the outer container 12 includes a bottom plate portion 61 which is a circular plate-like member in a plan view, and a peripheral cylinder portion 62 which extends upward from the outer periphery of the bottom plate portion 61. The bottom plate portion 61 and the peripheral cylinder portion 62 are arranged coaxially with the container axis O.

[0024] The upper surface of the bottom plate portion 61 is spaced downward from the lower surface of the bottom wall portion 31 and the lower edge of the surrounding tube portion 22, and a gap is formed between the lower surface of the bottom wall portion 31 and the lower edge of the surrounding tube portion 22. A flange-accommodating circular groove 62A is formed around the entire periphery of the inner circumferential surface at the upper end of the surrounding cylindrical portion 62, recessed radially outward relative to a portion located below this upper end. The flange-accommodating circular groove 62A is configured to accommodate the flange portion 41 of the surrounding cylindrical portion 22. A gap is formed between the inner circumferential surface of the surrounding cylindrical portion 62 and the outer circumferential surface of the surrounding cylindrical portion 22, but this gap does not have to be formed.

[0025] On the inner peripheral surface of the circumferential cylindrical portion 62, protrusion accommodating recesses 71 that are recessed radially outward are formed on both sides of the container axis O in a plan view. The protrusion accommodating recesses 71 are formed to be aligned in the circumferential direction with the window portion 22A of the inner container 11, and have a lower accommodating portion 72 and an upper accommodating portion 73 that is recessed radially outward to a greater extent than the lower accommodating portion 72.

[0026] The projection receiving recess 71 is configured to receive the projection 42, and the circumferential length and vertical width of the projection receiving recess 71 are respectively equal to the circumferential length and vertical width of the projection 42. Note that, as long as the projection receiving recess 71 can receive the projection 42, the circumferential length of the projection receiving recess 71 may be greater than the circumferential length of the projection 42, and the vertical width of the projection receiving recess 71 may be greater than the vertical width of the projection 42. Here, the lower receiving portion 72 is configured to receive the lower projection portion 43 of the projection 42, and the upper receiving portion 73 is configured to receive the upper projection portion 44. A locking rib 74 protruding radially inward is formed on a portion of the circumferential cylindrical portion 62 that defines the upper receiving portion 73. The locking rib 74 extends circumferentially. On the inner peripheral surface of the circumferential cylindrical portion 62, a locking protrusion accommodating recess (second locking portion) 75 is formed, which is configured to accommodate the locking protrusion 44A of the protruding piece portion 42, by the lower surface of this locking rib portion 74 and the lower surface of the portion of the circumferential cylindrical portion 62 that defines the accommodating upper portion 73. The upper surface of the inner peripheral surface of the circumferential cylindrical portion 62 that defines the locking protrusion accommodating recess 75 (i.e., the lower surface of the locking rib portion 74) extends substantially in the radial direction, and the upper surface of the inner peripheral surface of the circumferential cylindrical portion 62 that defines the locking protrusion accommodating recess 75 is inclined downward from the radially outer side to the radially inner side.

[0027] Furthermore, a pair of rib accommodating recesses (second restricting portions) 76 recessed radially outward are formed on the inner peripheral surface of the peripheral cylindrical portion 62 on both sides of the protrusion accommodating recess 71 in the circumferential direction. The rib accommodating recesses 76 extend in the vertical direction and accommodate the radial rib portion 54. The vertical length and circumferential width of the rib accommodating recess 76 are equal to the vertical length and circumferential width of the radial rib portion 54, respectively. Note that the vertical length of the rib accommodating recess 76 may be shorter than the vertical length of the radial rib portion 54.

[0028] As described above, when the inner container 11 is attached to the inside of the outer container 12, the protrusions 42 are biased radially outward, so that the protrusions 42 are pressed against the inner circumferential surface of the outer container 12, the locking protrusions 44A are disposed in the protrusion-receiving recesses 71, and the radial ribs 54 are disposed in the rib-receiving recesses 76. As a result, the protrusions 42, and therefore the inner container 11, are positioned relative to the outer container 12 in the vertical and circumferential directions, and the inner container 11 is attached to the outer container 12.

[0029] 1, the lid body 2 includes a cylindrical inner lid body 81 with a top and a cylindrical outer lid body 82 with a top attached to the inside of the inner lid body 81. The inner lid body 81 and the outer lid body 82 are disposed coaxially with the container axis O. A female thread 81A that screws onto the male thread 32A of the inner container 11 is formed on the inner peripheral surface of the inner lid body 81. A liner 83 is disposed on the underside of the top wall of the inner lid body 81. The inner lid body 81 is made of, for example, polypropylene, and the outer lid body 82 is made of, for example, polyethylene terephthalate. The inner lid body 81 and the outer lid body 82 may be made of the same material or different materials.

[0030] Next, a method of using the double container 1 having the above-described structure will be described. First, by rotating the lid body 2 relative to the double container 1 about the container axis O, the female thread portion 81A formed on the inner lid body 81 of the lid body 2 is unscrewed from the male thread portion 32A formed on the inner container 11 of the double container 1, and the lid body 2 is removed from the double container 1. Here, the radial rib portion 54 of the inner container 11 is accommodated in the rib accommodating recess 76 of the outer container 12, restricting circumferential movement of the inner container 11 relative to the outer container 12, thereby more reliably restricting the inner container 11 from co-rotating with the lid body 2 about the container axis O relative to the outer container 12. Furthermore, the radial rib portion 54 and the portion of the circumferential cylindrical portion 62 that defines the rib accommodating recess 76 receive a circumferential force of the inner container 11 against the outer container 12, thereby suppressing the application of this circumferential force to the lower edge of the protruding piece 42 and preventing excessive circumferential load from being applied to the protruding piece 42. The lid body 2 is removed from the double container 1, and the contents contained in the inner container 11 are appropriately removed.Then, as described above, the lid body 2 is attached to the double container 1 by rotating the lid body 2 around the container axis O relative to the double container 1 in the opposite direction to that previously described.

[0031] When the inner container 11, which is a refill container, is to be replaced with a new inner container 11 filled with the contents after the contents of the inner container 11 have been used up, the inner container 11 is detached from the outer container 12 as follows. First, a finger is placed in the gap defined by the recessed portion 44B of the protrusion 42 and the flange-accommodating circular groove 62A of the circumferential cylindrical portion 62, and the protrusion 42 is elastically deformed radially inward starting from the lower edge of the protrusion 42. The protruding claw 45 moves radially inward, climbing over the detent protrusion 52. This releases the engagement between the locking protrusion 44A of the protrusion 42 and the protrusion-accommodating recess 71. Here, the radial inner surface of the protruding claw 45 is inclined radially outward from the circumferential base end to the tip, and the radial outer surface of the detent protrusion 52 is inclined radially outward from the base end to the tip, making it easy for the protruding claw 45 to climb over the detent protrusion 52 in the radial direction.

[0032] On the other hand, even if a finger or the like hooked on the protruding claw portion 45 is released and the protruding piece portion 42 attempts to restore and deform radially outward, the protruding claw portion 45 is locked to the detent projection 52 from the radially inner side, and therefore the protruding claw portion 45 of the protruding piece portion 42 is prevented from restoring and deforming radially outward beyond the detent projection 52. Here, since the radial outer surface of the protruding claw portion 45 is inclined radially outward from the circumferential base end toward the tip end, and the radial inner surface of the detent projection 52 extends substantially in the circumferential direction, the protruding claw portion 45, which is locked to the detent projection 52 from the radially outer side, is unlikely to overcome the protruding claw portion 45 in the radial direction due to the radially outward restoring force of the protruding piece portion 42. Thereafter, the inner container 11 is moved upward relative to the outer container 12 and the inner container 11 is pulled out from the outer container 12.

[0033] Next, a new inner container 11 filled with the contents is attached to the inside of the outer container 12. As described above, before the inner container 11 is attached to the outer container 12, the protrusions 42 protrude radially outward from the lower edge of the protrusions 42. The inner container 11 is inserted into the outer container 12 with the protrusions 42 of the inner container 11 and the protrusion-receiving recesses 71 of the outer container 12 aligned in the circumferential direction. Here, the upper ends of the protrusions 42 abut against the upper edge of the circumferential cylindrical portion 62. As the inner container 11 is moved downward relative to the outer container 12, the protrusions 42 elastically deform radially inward from the lower edge of the protrusions 42 and are guided downward along the inner circumferential surface of the circumferential cylindrical portion 62.

[0034] When the locking protrusion 44A of the protruding piece 42 is aligned with the locking protrusion-accommodating recess 75 in the up-down direction, the locking protrusion 44A is restored and deformed radially outward, and is accommodated in the locking protrusion-accommodating recess 75. As a result, the locking protrusion 44A is engaged from below with the upper surface of the circumferential cylindrical portion 62 that defines the locking protrusion-accommodating recess 75 (i.e., the lower surface of the locking rib portion 74), thereby restricting upward movement of the inner container 11 relative to the outer container 12. Here, because the upper surface of the locking protrusion 44A extends substantially radially, and the upper surface of the inner circumferential surface of the circumferential cylindrical portion 62 that defines the locking protrusion-accommodating recess 75 (i.e., the lower surface of the locking rib portion 74) also extends substantially radially, the locking protrusion 44A is less likely to unintentionally come off upward from the locking protrusion-accommodating recess 75. Additionally, the radial rib portions 54 of the inner container 11 are housed in the rib housing recesses 76 of the outer container 12. This restricts the inner container 11 from moving in the circumferential direction relative to the outer container 12. Therefore, even if the inner container 11 is not fitted inside the outer container 12, it is sufficiently prevented from being separated from the outer container 12. In this manner, the new inner container 11 filled with the contents is attached to the inside of the outer container 12.

[0035] As described above, according to the double container 1 of this embodiment, by elastically deforming the protruding piece 42 radially inward to release the engagement between the locking protrusion 44A and the locking protrusion-accommodating recess 75, the inner container 11 can be detached from the outer container 12, and the inner container 11 can be easily separated from the outer container 12. Here, because the window 22A opens upward, a finger can easily be hooked on the upper end of the protruding piece 42, facilitating the operation of elastically deforming the protruding piece 42 radially inward.

[0036] Furthermore, since the radial rib portions 54 of the inner container 11 are accommodated in the rib accommodating recesses 76 of the outer container 12, circumferential movement of the inner container 11 relative to the outer container 12 is restricted, thereby more reliably suppressing relative circumferential movement and rattle between the inner container 11 and the outer container 12. In particular, when the lid body 2 is rotated about the container axis O relative to the double container 1 to remove the lid body 2 from the double container 1, the inner container 11 can be more reliably prevented from rotating together with the lid body 2 about the container axis O. Here, when a circumferential force is applied to the inner container 11, the radial rib portions 54 and the portions of the circumferential cylindrical portion 62 that define the rib accommodating recesses 76 receive this circumferential force, thereby preventing excessive application of this circumferential force to the protruding piece portions 42, particularly to the lower edge thereof.

[0037] Furthermore, when the inner container 11 is attached to the inside of the outer container 12, the protrusions 42 are urged radially outward and pressed against the inner surface of the circumferential cylindrical portion 62, which prevents the locking protrusions 44A and the locking protrusion-accommodating recesses 75 from unintentionally releasing their engagement, thereby more reliably maintaining the inner container 11 attached to the outer container 12. Furthermore, even if a finger or the like hooked on the protruding claw portion 45 is released after the protruding piece portion 42 has been elastically deformed radially inward, the protruding claw portion 45 engages with the detent protrusion 52 from the radially inward, so that the protruding piece portion 42 is prevented from restoring and deforming radially outward beyond the detent protrusion 52.

[0038] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, two projecting pieces are formed, but it is sufficient that at least one projecting piece is formed, and three or more projecting pieces may be formed. The upper edge of the protruding piece is connected to the part of the surrounding tube that defines the window portion, but if the protruding piece is capable of elastically deforming radially inward, it may also be configured to connect another part, such as the lower edge, to the surrounding tube. The protrusions are configured to be elastically deformed radially inward by hooking a finger or the like in the gap formed between them and the inner circumferential surface of the circumferential cylindrical portion. However, for example, the upper end of the protrusion may be configured to protrude above the circumferential cylindrical portion and be elastically deformed radially inward by hooking a finger on this protrusion. Other configurations may also be used as long as the protrusions are configured to be elastically deformed radially inward when the inner container is separated from the outer container. Furthermore, the protrusions may be exposed so that they can be accessed by a finger or the like when elastically deforming the protrusions radially inward. A hole that allows access to the protrusions may be formed in the outer container. Here, the hole may be a closed hole, such as a circular hole, or a hole that opens downward, similar to a window. Furthermore, the upper end of the radially outer surface of the protrusions does not have to be open to the outside relative to the inner circumferential surface of the outer container. The protruding piece is configured to be biased radially outward, but it does not have to be biased radially outward as long as it is elastically deformable radially inward. The protruding piece portion is made elastically deformable in the radial direction starting from the lower end edge by thinning the lower end edge that is connected to the part of the surrounding tube portion that defines the window portion, but it does not have to be thinned as long as it is elastically deformable radially inward. The surrounding cylindrical portion of the inner container is formed with a pair of radial ribs, but it is sufficient that at least one radial rib is formed, and it is not necessary that no radial rib is formed. Similarly, the surrounding cylindrical portion of the inner container is formed with a pair of rib accommodating recesses, but it is sufficient that at least one rib accommodating recess is formed, and it is not necessary that no rib accommodating recess is formed. Furthermore, the structure of the first and second restricting portions may be other than the structure of ribs and recesses. Although a detent projection is formed on the surrounding cylindrical portion of the inner container, it is not necessary that a detent projection is formed. The shapes of the inner container and the outer container are not limited to cylindrical, but may be other shapes such as polygonal cylindrical, elliptical, etc. Furthermore, the outer container does not have to be cylindrical with a bottom, and may be cylindrical without a bottom. The inner container is formed as a refillable container, but does not have to be formed as a refillable container. Also, the inner container has a configuration including a surrounding cylindrical portion to which the protruding piece is connected, but is not limited to a configuration including a surrounding cylindrical portion as long as the protruding piece is provided. The double container is configured such that the lid is removably attached to the inner container, but may also be configured such that the lid is removably attached to the outer container. The lid is attached to the double container in a detachable manner by screwing, but the lid may also be attached in a detachable manner using other mechanisms or configurations, such as a configuration in which the lid is connected to the outer container of the double container via a hinge, or a configuration in which the lid is simply placed over the double container in a detachable manner.

[0039] [Additional note 1] a cylindrical inner container with a bottom; a cylindrical outer container to which the inner container is detachably attached; a window portion that opens upward is formed on the outer peripheral wall portion of the inner container, the outer peripheral wall portion has a protruding piece portion disposed in the window portion and supported so as to be deformable radially inward relative to the outer peripheral wall portion, A first locking portion is formed on a radially outer surface of the protruding piece, A double container characterized in that a second locking portion is formed on the inner surface of the outer container, which locks onto the first locking portion from above the first locking portion and prevents the inner container from moving upward relative to the outer container. [Additional note 2] The inner container is formed with a first restricting portion, The double container according to claim 1, characterized in that the outer container is formed with a second regulating portion that engages with the first regulating portion in the circumferential direction and regulates circumferential movement of the inner container relative to the outer container. [Additional note 3] 3. The double container according to claim 1, wherein the protruding piece is biased radially outward. [Additional note 4] 4. The double container according to claim 1, wherein an upper end of the radially outer surface of the protruding piece is open to the outside relative to the inner circumferential surface of the outer container. [Additional note 5] 5. The double container according to claim 1, wherein the inner container is formed with a detent projection that can be engaged from the outside in the radial direction with the protruding piece that has been deformed radially inward. [Industrial Applicability]

[0040] According to the present invention, the double container in which the inner container can be easily separated from the outer container is found to have industrial applicability. [Explanation of symbols]

[0041] 1 double container, 11 inner container, 12 outer container, 22 surrounding tube portion (outer peripheral wall portion), 22A window portion, 42 protruding piece portion, 44A locking protrusion portion (first locking portion), 52 return stop protrusion portion, 54 radial rib portion (first restricting portion), 75 locking protrusion accommodating recess (second locking portion), 76 rib accommodating recess (second restricting portion)

Claims

1. a cylindrical inner container with a bottom; a cylindrical outer container to which the inner container is detachably attached; a window portion that opens upward is formed on the outer peripheral wall portion of the inner container, the outer peripheral wall portion has a protruding piece portion disposed in the window portion and supported so as to be deformable radially inward relative to the outer peripheral wall portion, a lower end edge of the protruding piece portion is connected to a portion of the outer peripheral wall portion that defines a lower end edge of the window portion, A first locking portion is formed on a radially outer surface of the protruding piece, A double container characterized in that a second locking portion is formed on the inner surface of the outer container, which locks onto the first locking portion from above the first locking portion and prevents the inner container from moving upward relative to the outer container.

2. The inner container is formed with a first restricting portion, The double container according to claim 1, characterized in that the outer container is formed with a second regulating portion that engages with the first regulating portion in the circumferential direction to regulate circumferential movement of the inner container relative to the outer container.

3. 3. The double container according to claim 1, wherein the protruding piece is biased radially outward.

4. 3. The double container according to claim 1, wherein an upper end of the radially outer surface of the protruding piece is open to the outside relative to the inner circumferential surface of the outer container.

5. 3. The double container according to claim 1, wherein the inner container is formed with a detent projection that can be engaged from the outside in the radial direction with the protruding piece that is deformed radially inward.

Images