Refillable container

Abstract

To provide a refillable container which is excellent in running cost, and a replacement container is unlikely to come off but can be easily attached to and detached from.SOLUTION: A refillable container 10 includes a container body 1 with a cylindrical inner surface 12 on which a protruding strip part 18 is formed around the cylindrical axis 100 in a predetermined angular range, a replacement container 2 that is to be attached to or detached from the container body, a shoulder member 4 that holds the replacement container, and a cap 3; on the protruding strip part is formed a groove 181 that is open at one end, the replacement container has a main part 21 that is continuous with a storage part 212 at the lower end side of a hollow cylindrical neck 211 to which the cap is attached, and a protruding strip engaging part 23 that is engaged with the groove formed around its periphery is formed. The shoulder member has a flat hollow cylindrical shape with a top surface 41 and a notch 44 formed on a side surface 422 that corresponds to the protruding strip part, the container body part has an annular gap between the outer surface on which the protruding strip engaging part is formed and the cylindrical inner surface, the protruding strip engaging part is inserted into the groove, and the shoulder member is fixed to the container body or the replacement container with the notch engaged with the protruding strip part and the side surface interposed in the gap.SELECTED DRAWING: Figure 1C

Description

[Technical Field]

[0001] The present invention relates to a refillable container, and more particularly to a set-type refillable container. [Background technology]

[0002] When the contents of a refillable container are used up, instead of discarding the entire container, only the contents or a separate container containing the contents can be replaced, allowing the container, or most of the container, to be used sustainably. This minimizes waste, reducing waste and promoting resource conservation. Of course, for users, after purchasing the initial refillable container, they only need to purchase a new replacement container with the contents, significantly reducing the running costs of continuing to use the contents.

[0003] So-called "set type" refillable containers, in which only the separate container (hereinafter sometimes referred to as "replacement container") described above is replaced, have the advantage over refillable containers in which only the contents are refilled that the contents can be easily refilled without soiling the hands when replacing the contents. Some set type refillable containers are configured so that the replacement container is detachably fitted into the container body. Furthermore, Patent Document 1 listed below describes a set type refillable container in which the replacement container is attached to the container body with a screw. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3152177 Summary of the Invention [Problem to be solved by the invention]

[0005] Set-type refillable containers are required to have a structure that prevents the replacement container from accidentally falling off the container body during use. In refillable containers where the replacement container is fitted into the container body, the replacement container is held in place by friction between the outer surface of the replacement container and the inner surface of the container body. Therefore, if the replacement container is replaced frequently or the number of replacements increases, the inner surface of the container body wears, and the frictional force required to hold the replacement container in place becomes insufficient, potentially causing the replacement container to accidentally fall off. Furthermore, since the replacement container must be attached or detached against frictional force, a considerable amount of force is required. Furthermore, there is a risk that the replacement container will splash out due to excessive force, especially during removal. If the contents are liquid and even a small amount of the contents remain in the replacement container, the contents may contaminate the surrounding area.

[0006] Furthermore, in the cosmetic container (refillable container) described in Patent Document 1, a small container (replacement container) having a small container fastening thread (female thread) is screwed into a secondary thread (external thread) formed on the container body. In other words, because the replacement container and the container body are attached and detached by the thread, wear problems are less likely to occur, as with the refillable container in which the replacement container is fitted into the container body. However, the structure of the small container (replacement container) in the refillable container described in Patent Document 1 is complex. Specifically, the small container (replacement container) has a flange portion formed on the outer periphery below the opening edge with a downward-opening mating groove, and furthermore, a thread is formed on the inner periphery of the groove wall within this mating groove. Therefore, the refillable container described in Patent Document 1 increases the manufacturing cost of the replacement container, reducing the user's advantage of reduced running costs by simply replacing the contents.

[0007] Therefore, an object of the present invention is to provide a refillable container in which the replacement container is difficult to come off and can be easily attached and detached while keeping running costs down. [Means for solving the problem]

[0008] One aspect of the present invention for achieving the above object is a refillable container comprising a container body, a replacement container detachably attached to the container body, a shoulder member detachably fixed to the container body to hold the replacement container, and a cap, The container body has a cylindrical inner surface and a hollow portion that opens upward, a plurality of protruding ridges are formed on the inner surface of the cylindrical member at equal angular intervals around the cylindrical axis, the protruding ridges extending in a predetermined angular range around the cylindrical axis; The protrusion portion has a groove formed therein that extends in a circumferential direction around the cylindrical axis and has one end open and the other end closed, The replacement container has a main portion formed by a hollow cylindrical neck portion having an open upper end and on which the cap is attached, and a hollow storage portion to be stored in the container body is continuous with the main portion, and a protrusion engaging portion that engages with the groove is formed around the periphery of the main portion, the shoulder member has a flat, hollow cylindrical shape having a top surface formed with an opening through which the neck portion is inserted, and a notch portion that opens downward is formed on a side surface corresponding to the protrusion portion, the replacement container is attached to the container body by inserting the protrusion engagement portion into the groove while an annular gap is formed between the outer surface on which the protrusion engagement portion is formed and the cylindrical inner surface of the container body; the shoulder member is fixed to the container body or the replacement container with the notch engaged with the protrusion and the side surface interposed in the gap; It is a refillable container. The container can also be a refillable container in which the protrusion engagement portion is formed on the outer peripheral surface of a ring-shaped flange portion formed around the main portion, and the hollow portion has an annular surface formed therein that supports the flange portion.

[0009] The refillable container may be configured such that the shoulder member is fixed flush with the upper end surface of the container body, and the upper end surface has a recess formed therein through which a portion of the side surface of the shoulder member is exposed. The refillable container may be configured such that the cap is a screw cap. [Effects of the Invention]

[0010] According to the present invention, a refillable container is provided in which the replacement container is difficult to come off and is easily detachable while keeping running costs down. Other advantages will be made clear in the following description. [Brief explanation of the drawings]

[0011] [Figure 1A] FIG. 2 is a diagram showing a state in which a cap is attached to a refillable container according to an embodiment. [Figure 1B] FIG. 2 is a diagram showing the refillable container according to the embodiment with the cap removed. [Figure 1C] 1 is a perspective view of a refillable container according to an embodiment of the present invention, disassembled into individual components, as viewed from above. [Figure 1D] 1 is a perspective view of a refillable container according to an embodiment, disassembled into individual components, as viewed from below. FIG. [Figure 2] 1 is a bird's-eye view of a container body of a refillable container according to an embodiment, viewed from a high angle. [Figure 3] 1 is a diagram showing the state in which the container body and the replacement container are attached in the refillable container according to the embodiment. FIG. [Figure 4] 10 is a diagram illustrating the engagement state of the protrusion portion of the container body, the protrusion engagement portion of the replacement container, and the notch portion of the shoulder member in the refillable container according to the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts are designated by the same reference numerals, and redundant explanations may be omitted. If a part designated by a reference numeral in one drawing is unnecessary, the same reference numeral may not be designated in other drawings. ===Example=== <Overview of the container> 1A to 1D show a refillable container (hereinafter, sometimes referred to as a "container") according to an embodiment. FIG. 1A is an external view of the container 10 with the cap 3 attached, and FIG. 1B is an external view of the container 10 with the cap 3 removed. FIGS. 1C and 1D are views of the container 10 disassembled into its components (1, 2, 4). Note that the cap 3 is omitted from FIGS. 1C and 1D. In the following, when describing the configuration and structure of the container 10, the outer side of the top surface of a closed end surface or an annular end surface, such as a top surface or bottom surface, of a cylindrical member or part with one end fully open may be referred to as an outer top surface, and the inner side of the top surface may be referred to as an inner top surface. Similarly, the bottom surface may be referred to as an outer bottom surface or an inner bottom surface. The outer top surface and the inner top surface, which are in a front-back relationship, may be referred to as a ceiling portion, and the outer bottom surface and the inner bottom surface may be referred to as a bottom portion.

[0013] As shown in Figures 1A and 1B, the container body 1 and cap 3 have an elliptical cylindrical appearance. A replacement container 2 and a shoulder member 4 are attached to the container body 1, and the cap 3 is detachably attached to the replacement container 2. As shown in Figures 1C and 1D, a container 10 according to the embodiment is composed of the container body 1, replacement container 2, cap 3, and shoulder member 4, each of which is an integrally molded resin component. The container body 1 has an elliptical cylindrical appearance and is formed with a hollow portion 11 inside which a portion of the replacement container 2 is housed. The replacement container 2 has a hollow cylindrical main portion 21, which is connected to a storage portion 212 with a hemispherical bottom below a cylindrical neck portion 211, and an annular flange portion 22 formed around the main portion 21. The neck portion 211 is the portion to which the cap 3 is attached, and the cap 3 has a cylindrical space inside, and is attached to the replacement container 2 by an appropriate engagement structure formed between the inner surface of the cylindrical space and the outer periphery of the neck portion 211 of the replacement container 2. The storage portion 212 is the portion that is stored in the container body 1. The shoulder member 4 is a flat cylinder with an annular ceiling portion 41, and is detachably fixed to the container body 1.

[0014] Here, as shown in FIG. 1B, the direction of the cylindrical axis 100 of the neck 211 when the replacement container 2 is stored in the container body 1 and the shoulder member 4 is attached is defined as the up-down direction, and this up-down direction also applies to the other members (1, 3, 4) regardless of the posture. Furthermore, the up-down directions are defined assuming that the cap 3 is attached from above the neck 211. Therefore, FIG. 1C is an exploded perspective view of the container 10 as viewed from above, and FIG. 1C is an exploded perspective view of the container 10 as viewed from below. Below, the specific configuration and structure of the container 10 will be described mainly with reference to FIGS. 1C and 1D. <Specific configuration and structure of the container> As described above, the container body 1 has an elliptical cylindrical appearance, and inside is formed a hollow portion 11, which is a space in which the replacement container 2 is attached. FIG. 2 is a perspective view of the container body 1 viewed from a high angle. As shown in FIG. 2, the upper end side of the hollow portion 11 of the container body 1 is a double cylindrical shape that is flat from top to bottom, and the upper end of the inner circumferential surface 12 of the hollow cylindrical region corresponding to the outer cylinder is a circular opening 131 formed in the outer top surface 13 of the container body 1. The hollow cylindrical region corresponding to the inner cylinder has an outer circumferential surface 14 that is a cylindrical side surface, but the inside gradually tapers downward, forming a deep bowl shape that reaches near the bottom 15 of the container body 1. The upper end 16 of the inner cylinder is below the outer top surface 13 of the container body 1. In this way, the hollow portion 11 of the container body 1 has a shape in which a double-cylindrical region (hereinafter sometimes referred to as the "upper region") at the upper end side having a circular inner bottom surface 17 and a bowl-shaped lower region (hereinafter sometimes referred to as the "lower region") that is continuous with the inner surface of the inner cylinder are continuous. In addition, shallow recesses 132 are formed at two locations symmetrical to each other with respect to the cylindrical axis 100 on the periphery of the opening 131 in the outer top surface 13 of the container body 1.

[0015] At the position where the recess 132 is formed on the inner circumferential surface 12 of the outer cylinder of the double-cylinder upper region, a portion (hereinafter sometimes referred to as a "protrusion 18") is formed that protrudes around the cylinder axis 100 at a predetermined angular range. The protrusion 18 has a groove 181 that extends in the circumferential direction and is open at one end and closed at the other. In this embodiment, the direction from the open end 182 of the groove 181 to the closed end 183 is counterclockwise when viewed from above. The protrusion 18 is also formed by an L-shaped rib 184 that extends counterclockwise a predetermined angle from the open end 182 of the groove 181 when viewed from above, then bends downward at a right angle and connects to the annular inner bottom surface of the upper region. Therefore, the groove 181 of the protrusion 18 is formed between the circumferentially extending portion of the rib 184 and the inner bottom surface 17 of the upper region. 1C and 2, a portion of the inner cylinder corresponding to the region where the protrusion 18 is formed on the upper end 16 side is cut out down to the inner bottom surface 17. This cutout portion 161 is provided in consideration of the mold opening operation when manufacturing the container body 2, which is an injection-molded product.

[0016] The exchange container 2 has a cylindrical axis 100 in the vertical direction, and is composed of a hollow cylindrical main portion 21 with a bowl-shaped outer bottom surface, and an annular flange 22 formed on the side surface of the main portion 21. As shown in FIG. 1C, the flange 22 is formed midway from the upper end to the lower end of the cylindrical side surface of the main portion 21. When viewed obliquely from above, it has a torus shape with a thickness in the vertical direction. However, as shown in FIG. 1D, it is not solid, but rather has a flat, hollow cylindrical shape with a thin, annular ceiling portion 221. In addition, a rib-like protrusion (hereinafter sometimes referred to as a "protrusion engagement portion 23") is formed at the lower end of the side surface 222 of the flange 22. The protrusion protrudes radially from the cylindrical axis 100 and revolves around the cylindrical axis 100 within a predetermined angular range. This protrusion engages with the groove 181 of the protrusion 18 of the container body 1. The interior of the main portion 21 is a hollow cylindrical shape with a bottom and a bowl-shaped inner bottom surface. The outer diameter of main portion 21 is smaller than the diameter of the opening of the inner cylinder in the upper space of container body 1. As shown in Fig. 1D, the inner diameter of flange portion 22 is such that it circumscribes outer peripheral surface 14 of the inner cylinder in the upper region of container body 1, and the outer diameter of flange portion 22 is smaller than opening 131 in outer top surface 13 of container body 1. The vertical height of flange portion 22 is smaller than the vertical height (depth) of the upper region.

[0017] The neck portion 211 of the main portion 21 of the replacement container 2, above the flange portion 22, is provided with an engagement structure for a cap (not shown). The engagement structure between the neck portion 211 and the cap desirably minimizes visual misalignment with the container body when the cap is attached. In this embodiment, since both the container body 1 and the cap 3 are elliptical cylindrical, if the cap 3 is a screw cap, the thread position can be precisely adjusted or the number of turns of the thread can be reduced to ensure that the container body 1 and the cap 3 are flush with each other when the cap 3 is closed. Alternatively, a multiple-start thread can be used, allowing the cap 3 to be screwed on with a small rotation angle, making it easier to align the external shapes of the container body 1 and the cap 3. An engagement structure utilizing the elasticity of resin, such as a snap fit, eliminates the need to rotate the cap 3, reducing visual misalignment between the container body 1 and the cap 3. If at least one of the container body 1 and the cap 3 has a circular external shape when viewed from above, visual misalignment will not occur even if a typical screw cap is used. 1B to 1D, the neck 211 of the replacement container 2 in the container 10 is formed with a male thread 213 of the minimum number of turns (for example, one turn) required to close the cap 3, and the cap 3 is formed with a female thread that screws into the male thread 213. In any case, the engagement structure between the neck 211 of the replacement container 2 and the cap 3 can be selected appropriately.

[0018] The shoulder member 4 has a vertically flat, hollow cylindrical shape with a ceiling portion 41. As shown in FIG. 1D , a side wall 42 is vertically suspended from the periphery of the annular inner top surface 411, wrapping around the cylindrical axis 100. The side wall 42 has an outer diameter that inscribes the upper region of the container body 1 and is fitted into the opening 131 of the container body 1. The vertical height of the inner peripheral surface 421 of the side wall 42 is approximately equal to the vertical height of the outer peripheral surface 14 of the inner cylinder in the upper region of the container body 1. The opening 43 of the ceiling portion 41 has an inner diameter smaller than the inner diameter of the lower region of the container body 1, and has an inner diameter sufficient to insert the neck portion 211 of the replacement container 2. The side wall 42 of the shoulder member 4 has a notch 44 that opens downward and corresponds to the protrusion 18. Therefore, when the shoulder member 4 is attached to the container body 1, the cutouts 44 engage with the protrusions 18, and the outer top surface 13 of the container body 1 and the outer top surface 412 of the shoulder member 4 are flush with each other. The shoulder member 4 and the container body 1 are configured to be detachable from each other using an appropriate engagement structure (not shown).

[0019] As an engagement structure between the shoulder member 4 and the container body 1, for example, a protrusion may be provided on the outer peripheral surface of the side wall 42 of the shoulder member 4, and a recess for engaging with the protrusion may be provided on the inner peripheral surface 12 of the upper region of the container body 1. A protrusion that protrudes downward may be provided on the lower end surface of the side wall 42 of the shoulder member 4, and a hole for engaging with the protrusion may be formed in the region of the inner bottom surface 17 of the upper end region of the container body 1, as shown in FIG. 1C . When removing the shoulder member 4, the outer peripheral surface 422 of the side wall 42 of the shoulder member 4 is exposed through the recess 132 in the outer top surface 13 of the container body 1, so that the outer peripheral surface 422 can be hooked with a finger. Of course, the position and number of the recesses 132 may be appropriately determined. <Attaching and detaching replacement containers> To attach and secure the replacement container 2 to the container body 1, first, the storage section 212 of the replacement container 2 is stored in the hollow section 11 of the container body. Figure 3 shows the storage section 212 of the replacement container 2 stored in the hollow section 11 of the container body 1. When storing the storage section 212 in the hollow section 11, the container body 1 and the replacement container 2 are rotated relative to each other about the cylindrical axis 100 so that the protrusions 18 and the protrusion engagement sections 23 do not overlap in the vertical direction. When the storage section 212 of the replacement container 2 is stored in the hollow section 11 of the container body 1 in this state, the flange 22 covers the inner tube in the upper region, and the lower end surface 223 of the flange 22 is supported by the step in the hollow section, and the hollow section 11 of the container body 1 and the replacement container 2 are arranged coaxially. At this time, as shown in FIG. 3, the outer peripheral surface 222 of the flange portion 22 and the inner peripheral surface 12 on the outer cylinder side of the upper stage region are not in close contact with each other, and a gap is generated between them.

[0020] Next, when the replacement container 2 is rotated counterclockwise as viewed from above, the groove 181 of the protrusion 18 engages with the protrusion engagement portion 23, and the replacement container 2 is attached to the container body 1. However, at this stage, the replacement container 2 is not fixed to the container body 1, and would easily come off the container body 1 if rotated clockwise relative to the container body 1. Therefore, the shoulder member 4 is attached to the container body 1 so that the replacement container 2 cannot rotate. As a result, the groove 181 of the protrusion 18 engages with the protrusion engagement portion 23, and the protrusion 18 engages with the notch 44, and the replacement container 2 is fixed to the container body 1.

[0021] Fig. 4 shows the state in which the protrusion 18, the protrusion engagement portion 23, and the notch 44 are engaged with one another. Note that Fig. 4 corresponds to a view of the protrusion 18 viewed radially outward from the cylindrical shaft 100, as indicated by the filled-in arrow 101 in Fig. 1C. In Fig. 4, the container body 1, the replacement container 2, and the shoulder member 4 are indicated by different hatching. As shown in Fig. 4, the side wall 42 of the shoulder member 4 is formed with the above-mentioned notch 44. When the protrusion 18 engages with this notch 44, the edge of the notch 44 closes the open end 182 of the groove 181. When the replacement container 2 is fixed to the container body 1, the ridge engagement portion 23 is inserted into the groove 181 of the ridge portion 18, and the region of the rib 184 constituting the ridge portion 18 from the edge 185 on the left side of the paper surface to the open end 182 side of the groove 181 is positioned between the left and right edges (44L, 44R) on the paper surface of the notch 44 of the shoulder member 4. As a result, the ridge engagement portion 23 engages with the groove 181, restricting upward movement of the replacement container 2, and the open end 182 of the groove 181 is closed by the notch 44 of the shoulder member 4, restricting rotation.

[0022] The above is the procedure for attaching the replacement container 2 to the container body 1 and then fixing it with the shoulder member 4. To remove the replacement container 2, remove the shoulder member 4 by using the recess 132 formed on the outer top surface 13 of the container body 1 as a guide, and then rotate the replacement container 2 clockwise when viewed from above to release the engagement between the groove 181 of the protrusion 18 and the protrusion engagement portion 23. Then, the replacement container 2 can be removed by pointing it upward.

[0023] According to the container 10 of the embodiment having the above-described configuration and structure, the replacement container 2 can be easily attached and detached using the procedure described above. Furthermore, the shape of the replacement container 2 can be simplified by simply providing the ridge engagement portion 23 on the outer circumferential surface 222 of the flange portion 22, contributing to reduced running costs. Furthermore, if the cap 3 is a screw cap, the shoulder member 4 is not fastened by a screw. This prevents the so-called "co-rotation" phenomenon from occurring when the cap 3 is rotated and removed. Therefore, the shoulder member 4 will not accidentally fall off when the cap 3 is removed. Of course, there is no need to use an uncommon "reverse thread" on either the cap 3 or the shoulder member 4 to prevent co-rotation. Furthermore, because the shoulder member 4 is attached to the outer top surface 13 of the container body 1, the shoulder member 4 is not exposed to the outside when the cap 3 is closed, allowing for greater design flexibility for the container 1. ===Other Examples=== In the container 1 according to the above embodiment, the ridge portions 18 and the ridge engagement portions 23 are each formed at two locations that are 180° apart around the cylindrical axis 100, but the ridge portions 18 and the ridge engagement portions 23 may also be formed at multiple locations, three or more, at equal angular intervals.

[0024] In the container 1 according to the above embodiment, the hollow portion 11 is double-cylindrical, and the flange 22 of the replacement container 2 is supported by the inner bottom surface 17 of the upper region to prevent the replacement container 2 from falling into the hollow portion 11 and to facilitate coaxial arrangement of the hollow portion 11 and the replacement container 2. However, the hollow portion 11 may be cylindrical, for example, continuing from the opening 131 to the inner bottom surface of the container body 1 while maintaining the same inner diameter. Furthermore, the flange 22 of the replacement container 2 may be omitted, and the ridge engagement portion 23 may be formed directly around the main portion 21. This allows the container body 1 and the replacement container 2 to have simpler shapes. Of course, the main portion 21 of the replacement container 2 and the hollow portion 11 of the container body 1 are not limited to being cylindrical, and may be rectangular or tubular, for example. In any case, it is sufficient that a protrusion 18 having a groove 181 that extends in the circumferential direction around the cylindrical axis 100 and is open at one end and closed at the other end is formed on the inner peripheral surface 12 of the hollow portion 11 of the container body 1, and that a protrusion engagement portion 23 that is inserted into the groove 181 of the protrusion 18 is formed around the periphery of the replacement container 6. Then, the cap 3 is attached to the neck portion 211 using an appropriate attachment structure.

[0025] The shoulder member 4 prevents the ridge engagement portion 23, which is engaged with the ridge portion 18, from moving out in the circumferential direction when the notch 44 engages with the ridge portion 18, and therefore the shoulder member 4 may be configured to engage not only with the container body 1 but also with the replacement container 2. In other words, the shoulder member 4 and the replacement container 2 may be configured to be detachable from each other using an appropriate engagement structure.

[0026] In the above embodiment, the recess 132 is formed in the container body 2 in order to remove the shoulder member 4 engaged with the container body 2, but of course the recess 132 does not have to be formed. Instead of the recess 132, a portion on the shoulder member 4 side where a finger or nail can be hooked may be formed, such as by forming a hole in the ceiling portion 41 large enough to hook a finger or nail on the shoulder member 4. In any case, the shoulder member 4 only needs to be configured to be detachable from the container body 2 or the replacement container 3. [Explanation of symbols]

[0027] 1 container body, 2 replacement container, 3 cap, 4 shoulder member, 11 hollow portion of container body, 12 Inner peripheral surface of container body, 13 Outer top surface of container body, 17 Bottom surface of hollow portion supporting replacement container, 18 Protrusion portion, 21 Main portion, 22 Flange portion, 23 Protrusion engagement portion, 41 Ceiling portion of shoulder member, 42 Side wall of shoulder member, 43 Opening of shoulder member, 44 Notch portion, 131 Opening of container body, 132 Recess, 181 Groove of protrusion portion, 182 Open end of groove, 183 Closed end of groove, 184 Rib constituting protrusion portion, 211 Neck portion, 212 Receiving portion, 412 Outer top surface of shoulder member

Claims

1. A refillable container comprising a container body, a replacement container detachably attached to the container body, a shoulder member detachably fixed to the container body to hold the replacement container, and a cap, The container body has a cylindrical inner surface and a hollow portion that opens upward, a plurality of protruding ridges are formed on the inner surface of the cylindrical member at equal angular intervals around the cylindrical axis, the protruding ridges extending in a predetermined angular range around the cylindrical axis; The protrusion portion has a groove formed therein that extends in a circumferential direction around the cylindrical axis and has one end open and the other end closed, The replacement container has a main portion formed by a hollow cylindrical neck portion having an open upper end and on which the cap is attached, and a hollow storage portion to be stored in the container body is continuous with the main portion, and a protrusion engaging portion that engages with the groove is formed around the periphery of the main portion, the shoulder member has a flat hollow cylindrical shape having a top surface formed with an opening through which the neck portion is inserted, and a notch portion that opens downward is formed on a side surface corresponding to the protrusion portion, the replacement container is attached to the container body by inserting the protrusion engagement portion into the groove while an annular gap is formed between the outer surface on which the protrusion engagement portion is formed and the cylindrical inner surface of the container body; the shoulder member is fixed to the container body or the replacement container with the notch engaged with the protrusion and the side surface interposed in the gap; Refillable container.

2. 2. The refillable container according to claim 1, wherein the protrusion engagement portion is formed on the outer peripheral surface of a ring-shaped flange portion formed around the main portion, and the hollow portion has an annular surface formed therein that supports the flange portion.

3. 2. The refillable container according to claim 1, wherein the shoulder member is fixed flush with an upper end surface of the container body, and a recess is formed in the upper end surface to expose a portion of the side surface of the shoulder member.

4. The refillable container according to any one of claims 1 to 3, wherein the cap is a screw cap.

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