Container with cap, cap with inside plug, and assembly method of container with cap

Abstract

To provide a container with a cap which enables removal of an inside plug from the container and prevents complication of steps after the container is filled with a content during the assembly.SOLUTION: In a container with a cap, a container 3 includes: a container body 1 having a mouth part 13 including a small diameter mouth part 14 in which a first male screw 15 is provided on an outer peripheral surface, and a large diameter mouth part 16 which is located below the small diameter mouth part 14 and has a larger diameter than that of the small diameter mouth part 14 and in which a second male screw 17 is provided on an outer peripheral surface; and an inside plug 2 provided with a discharge hole O for discharging a content and an attachment cylinder 25 in which a female screw 26 is provided on an inner peripheral surface. A cap 4 has: an engagement cylinder 43 in which a female screw 44 is provided on its inner peripheral surface. The inside plug 2 may be removed from the container body 1. The female screw 26 of the inside plug 2 engages with the first male screw 15 of the mouth part 13. The female screw 44 of the cap 4 engages with the second male screw 17 of the mouth part 13 below the inside plug 2. The first male screw 15 and the second male screw 17 of the mouth part 13 have a same screw lead.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a container with a cap, which includes a container having a container body and an inner plug, and a cap that can be engaged with the container, a cap with an inner plug, and a method for assembling a container with a cap. [Background technology]

[0002] In recent years, awareness of the "SDGs (Sustainable Development Goals)" for creating a sustainable society has increased dramatically. In the field of cosmetics as well, in order to increase the amount of reusable materials, there has been an increase in refilling of containers so that lids and cases can be reused, or removing the cap from an empty container and refilling it with the refillable contents.

[0003] Patent Document 1 also proposes a configuration in which a plug is detachably fitted to the wide-mouthed opening of a tube container. In this configuration, the outer periphery of the opening of the container is stepped, and the male screw, which is an outer helical screw, is provided in two steps. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5378136 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the container mouth has a two-stage spiral, then during manufacturing, after filling the container with the contents, it becomes necessary to perform two end closing operations with different diameters, which makes the assembly process complicated.

[0006] In view of the above circumstances, an object of the present invention is to provide a capped container that allows the inner plug to be removed from the container and prevents the process of assembling the container after filling it with contents from becoming complicated. [Means for solving the problem]

[0007] In order to solve the above problems, in one aspect of the present invention, A container with a cap, The container is A container body having a mouth including a small-diameter mouth portion having a first male screw provided on an outer circumferential surface thereof and a large-diameter mouth portion below the small-diameter mouth portion, the large-diameter mouth portion having a larger diameter than the small-diameter mouth portion and a second male screw provided on an outer circumferential surface thereof; a plug having a discharge hole for discharging the contents and a mounting tube having a female screw on an inner circumferential surface thereof; The cap has an engagement tube having a female screw on an inner circumferential surface, The inner plug is removable from the container body, the female thread of the inside plug engages with the first male thread of the mouth portion; the female thread of the cap engages with the second male thread of the mouth portion below the plug; The first male thread and the second male thread of the mouth portion have the same thread lead. A container with a cap is provided. Effect of the Invention

[0008] According to one embodiment, in a container with a cap, the inside plug can be removed from the container, which makes it possible to prevent the process after filling the container with the contents during assembly from becoming complicated. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall exploded view of a capped container according to a first embodiment of the present invention; [Diagram 2] 2 is an enlarged cross-sectional view of half of the vicinity of the mouth of the capped container according to the first embodiment. [Diagram 3] 2A is a cross-sectional view of the cap according to the first embodiment, and a side view of the inside plug. FIG. [Figure 4] 3A is a bottom view of the cap according to the first embodiment, and FIG. 3B is a top view of the inside plug. [Diagram 5]FIG. 2 is a cross-sectional perspective view of a cap with an inside plug according to the first embodiment. [Figure 6] FIG. [Figure 7] FIG. 2 is an enlarged transparent view of the mouth portion of the container body according to the first embodiment. [Figure 8] FIG. 4 is an explanatory diagram of the number of threads and thread inclination of the male screw at the mouth of the container body in the first embodiment. [Figure 9] FIG. 2 is an inner perspective view of the cap with an inside plug according to the first embodiment. [Figure 10] FIG. [Figure 11] 4 is a flowchart showing the process for assembling a container with a cap during manufacturing. [Figure 12] 5A to 5C are diagrams showing the operation when assembling a capped container according to the first embodiment. [Figure 13] A diagram showing the relative positions of the female thread of the cap with inner plug and the male thread of the mouth when assembled. [Figure 14] FIG. 6 is an enlarged half-sectional view of the vicinity of a capped mouth portion according to a second embodiment of the present invention. [Figure 15] FIG. 11 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container according to a third embodiment of the container of the present invention. [Figure 16] 6 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container according to a second configuration example of the cap of the present invention. FIG. [Figure 17] 13 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container according to a third configuration example of the cap of the present invention. FIG. [Figure 18] 13 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container according to a fourth configuration example of the cap of the present invention. FIG. [Figure 19] 13 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container according to a fifth configuration example of the cap of the present invention. FIG. [Figure 20] 13 is an explanatory half-sectional view of the vicinity of the mouth of a capped container according to a modified example of the rotation end point of the inside plug of the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same components are denoted by the same reference numerals, and duplicated explanations may be omitted.

[0011] The present invention relates to a container with a cap, an inner stopper, and a cap with an inner stopper. The container with a cap includes a container having a container body and an inner stopper, and a cap that can be engaged with the container. The cap with an inner stopper includes an inner stopper and a cap. The container is, for example, a self-supporting container whose container part is cylindrical, elliptical cylindrical, or rectangular. Alternatively, the container may be a flexible tube container made of resin, metal film, paper, or the like.

[0012] The contents to be stored in the container of the present invention are preferably liquids that are not intended for single use but are intended to be used in small amounts over several uses, such as cosmetics such as beauty serums and sunscreens, or stationery such as glue and ink, and in particular liquids with a content of 30,000cs or less.

[0013] <Overall composition> First, the configuration of a capped container according to a first embodiment will be described with reference to Figures 1 and 2. Figure 1 is an overall exploded view of a capped container according to a first embodiment of the present invention. Figure 2 is an enlarged cross-sectional view of half of the vicinity of the mouth of the capped container according to the first embodiment.

[0014] 1, a capped container 5 has a container 3 and a cap 4. The container 3 includes a container body 1 and an inner plug 2.

[0015] 1 and 2, container body 1 has an elliptical body 10 in a top view, with the lower end of body 10 being a bottom 11 and the upper end of body 10 being a shoulder 12. A cylindrical mouth 13 is provided to stand up from the center of shoulder 12. The vicinity of the outer edge of shoulder 12 is an outer edge step 12S that is slightly lower than the center side.

[0016] The mouth 13 has a three-stage cylindrical structure with a small diameter mouth 14 at the top, a large diameter mouth 16 at the bottom, and a mouth root 19 at the bottom. A first male thread 15, which is a helical protrusion, is provided on the outer circumferential surface of the small diameter mouth 14. A second male thread 17, which is a helical protrusion, is provided on the outer circumferential surface of the large diameter mouth 16. An annular protrusion 18 is provided on the outer circumferential surface of the large diameter mouth 16 below the second male thread 17. A pair of rotation stop hooks 19F is provided on the mouth root 19 below the annular protrusion 18.

[0017] The mouth base 19 may be of the same thickness as the large diameter mouth 16, and the mouth 13 may have a cylindrical shape with at least two stages, a small diameter mouth 14 on the upper end side and a large diameter mouth 16 on the lower side.

[0018] 1 and 2, the inside plug 2 has a triple-structure cylinder consisting of, from the top, a nozzle 21 and an annular upper surface 22. In the inside plug 2, below the upper nozzle 21 and the annular upper surface 22, an attachment cylinder 25, an intermediate cylinder 28, and a suction cylinder 29 are concentrically provided.

[0019] Nozzle 21 is a nozzle cylinder with a narrow upper side and a wider lower side, with a discharge hole O formed at the tip (upper end) of nozzle 21. At the bottom center of nozzle 21, a suction cylinder 29, which has a smaller diameter than intermediate cylinder 28 and carries the contents to discharge hole O, is provided.

[0020] When the inside plug 2 is viewed from the outside, an annular upper surface 22, which is a flange surface, is provided below the lower end of the nozzle 21. An annular upper surface 22 is provided with a plurality of locking recesses 23 arranged in a ring shape when viewed from above. The boundaries between the plurality of locking recesses 23 are slightly elevated upward, and the same number of partitioning protrusions 24 as the number of locking recesses 23 are provided. It is noted that the partitioning protrusions 24 do not necessarily have to be provided.

[0021] An attachment tube 25 is provided below the annular upper surface 22 of the inside plug 2 so as to hang down from the outer edge of the annular upper surface 22. A female thread 26 is provided on the inner peripheral surface of the attachment tube 25, and the outer peripheral surface of the attachment tube 25 has a jagged structure (grommet structure) with multiple slits 27. Note that the slits 27 do not necessarily have to be provided.

[0022] Furthermore, an intermediate tube 28 is provided inside the mounting tube 25, which sandwiches the small diameter opening portion 14 of the container body 1 from the inner peripheral side together with the mounting tube 25. In this embodiment, the container body 1 and the inner plug 2 are airtightly sealed by sandwiching the small diameter opening portion 14 of the container body 1 between the mounting tube 25 and the intermediate tube 28. Note that the intermediate tube 28 does not necessarily have to be provided (see FIG. 15).

[0023] In the inside plug 2 having such a structure, the mounting cylinder 25 surrounds the small-diameter opening 14 of the container body 1 from the outer periphery, and the female thread 26 of the mounting cylinder 25 threadably engages with the first male thread 15 of the small-diameter opening 14. During normal use, the inside plug 2 is always attached to the small-diameter opening 14 of the container body 1.

[0024] In this embodiment, the cap 4 has a triple-cylinder structure with a top, and includes a top surface 41, a concentric outer peripheral wall 42, an engagement tube 43, and a tightening tube 46. A stoppering projection 48 is provided at the center of the underside of the top surface 41. The engagement tube 43 and the tightening tube 46 of the cap may be partially integrated, and this configuration will be described in detail with reference to FIG.

[0025] The outer peripheral wall 42 is the outermost cylindrical portion and serves as the outer wall. The engagement tube 43 is a cylindrical portion that has a smaller diameter than the outer peripheral wall 42 and has a female thread (helical protrusion) 44 provided on its inner peripheral surface. In the female thread 44, a lower portion is a female thread 44a for engagement with the second male thread 17 of the large-diameter opening portion 16, and an upper portion is a female thread 44b that is not used for engagement with the inside plug 2.

[0026] The top surface 41 of the cap 4 is elliptical, and is provided with rotation stoppers 45A and 45B (see FIG. 3) at positions opposing each other in the minor axis direction of the engagement tube 43.

[0027] The tightening tube 46 has a smaller diameter than the engagement tube 43, and the lower end of the tightening tube 46 is provided with a plurality of lower end steps 47 arranged in an annular shape for locking. The tightening tube 46 is a tube that meshes with the inside plug 2 and is rotated to tighten it.

[0028] When the cap 4 is fully attached, the engagement tube 43 surrounds the mouth 13 engaged with the inner plug 2 of the container 3 from the outer periphery, and the female thread 44 of the engagement tube 43 engages with the second male thread 17 of the large-diameter mouth 16. At this time, the annular projection 18 of the large-diameter mouth 16 is hidden inside the engagement tube 43 of the cap 4, and the rotation stoppers 45A and 45B at the lower end of the engagement tube 43 are clamped between the two rotation stopper hook pairs 19F to stop rotation.

[0029] Next, the configuration and engagement between the cap 4 and the inside plug 2 will be described with reference to Figures 3, 4, and 5. Figure 3 is a side cross-sectional view of the cap 4 according to the first embodiment, and a side view of the inside plug. Figure 4 is a bottom view of the cap 4 according to the first embodiment, and a top view of the inside plug 2. Figure 5 is a cross-sectional perspective view of the cap with an inside plug according to the first embodiment. In order to show the locking configuration, Figure 5 shows a cut surface offset from the half, and the inside plug 2 is shown as if it were transparent.

[0030] (Interlocking for co-rotation) As shown in Fig. 3(a), the lower end step 47 at the lower end of the tightening tube 46 of the cap 4 functions like a ratchet tooth and is composed of multiple protrusions (triangular protrusions) that extend downward, each of which is in the shape of a right angle triangle, and each of which is composed of an inclined side 47a and a vertical side 47b. In this embodiment, as shown in Fig. 4(a), the lower end step 47 is composed of eight downward protrusions.

[0031] As shown in Figs. 4(b) and 5, the multiple locking recesses 23 of the inside plug 2 are multiple arc-shaped recesses arranged in a ring shape in top view near the outer edge of the annular upper surface. As shown in Fig. 4(b), in this configuration example, the multiple locking recesses 23 are eight recesses. As shown in Fig. 3(b), the bottom depth of each recess of the multiple locking recesses 23 is formed to be deeper in one circumferential direction. Therefore, the bottom surface of each locking recess 23 is an inclined surface (inclined bottom surface) 23a in the circumferential direction. In addition, a vertical surface (recess vertical wall) 23b that is connected to the inclined surface 23a and falls vertically from the annular upper surface 22 to the deepest part as a boundary with the multiple partition protrusions 24 is provided.

[0032] 3 and 5, when the cap 4 rotates clockwise (tightening direction), the vertical side 47b at the lower end of the tightening tube 46 meshes with the vertical wall 23b of the recess in the annular upper surface 22 of the inside plug 2, and the cap 4 and the inside plug 2 rotate together. On the other hand, when the cap 4 rotates counterclockwise (loosening direction), the inclined side 47a of the triangular protrusion of the tightening tube 46 and the inclined bottom surface 23a of the locking recess 23 of the inside plug 2 move away from each other without interfering with each other, and the cap 4 and the inside plug 2 do not rotate together.

[0033] In this manner, the downward projections of the multiple lower end steps 47 for locking of the cap 4 and the multiple locking recesses 23 of the inside plug 2 engage with each other only in the direction in which the cap 4 is tightened.

[0034] 4 and 5 show an example in which two downward projections are provided on the lower end step 47 of the tightening tube 46 of the cap 4, and two multiple locking recesses 23 are formed on the inner plug 2. In the present invention, the number of interlocking structures between the cap 4 and the inner plug 2, which are formed by the downward projections of the lower end step 47 of the cap 4 and the locking portions (locking recesses 23), is equal to the number of female threads 44 of the cap 4, i.e., the number of thread multipliers of the male thread 17 provided on the large-diameter opening portion 16. In this example, the female thread 44 of the cap 4 is a double-start thread, and therefore an example is shown in which there are two interlocking structures in the circumferential direction, but in the case of a single-start thread, there is one interlocking structure in the circumferential direction, and in the case of a four-start thread, there are four interlocking structures in the circumferential direction, etc.

[0035] In this configuration, the female thread 44 provided on the cap 4 is a double-threaded thread, and therefore the lower end of the female thread 44 has two ends, which are inserted for threaded engagement, provided in two locations in the circumferential direction, as shown by the arrows in Figure 4(a).

[0036] (Female thread structure of cap) 2, and in a state in which the cap 4 is engaged with the container 3, as well as in a state in which the inside plug 2 and the cap 4 are engaged with each other (a state in which the cap is provided with an inside plug) as shown in FIG. 5, the upper inner peripheral side of the female thread 44 of the engagement tube 43 of the cap 4, which is close to the top surface, is hidden by the inside plug 2. That is, in the female thread 44, when the multiple lower end steps 47 of the tightening tube 46 of the cap 4 are engaged with the multiple locking recesses 23 on the upper surface of the inside plug 2 as shown in FIGS. 5 and 9, the portion exposed downward from the lower end of the inside plug 2 is the female thread 44a for engagement used for threaded engagement with the second male thread 17.

[0037] (Modification 1 of the inner stopper) In Figures 1, 2, 4(b), and 5, examples are shown in which the multiple locking portions of the inner plug for engaging with the cap 4 are locking recesses, but the locking portions on the annular upper surface of the inner plug 2 that lock with the lower end step of the tightening tube 46 may also be convex portions.

[0038] 6 is an explanatory diagram of a modified inside plug, where (a) is a side view and (b) is a top view. In this configuration, as shown in FIG. 6(b), the locking portion of the inside plug 2α is two arc-shaped locking protrusions 230 provided near the outer edge of the annular upper surface 22α.

[0039] In this configuration, each of the two locking protrusions 230 has an inclined surface (inclined upper surface) 230a that is inclined so as to become higher in one circumferential direction as shown in Fig. 6(a). The locking protrusion 230 has a vertical surface (convex vertical wall) 230b that rises vertically from the same plane as the annular upper surface 22α toward the upper end of the inclined surface 230a.

[0040] The locking structure of the inner plug 2α of this configuration is locked in the same manner as the lower end step 47 of the tightening tube 46 of the cap 4 shown in Fig. 3(a). When the cap 4 in Fig. 3(a) rotates clockwise (tightening direction), the vertical side 47b at the lower end of the tightening tube 46 meshes with the convex vertical wall 230b of the annular upper surface 22α of the inner plug 2α in Fig. 6, and the cap 4 and the inner plug 2α rotate together. On the other hand, when the cap 4 rotates counterclockwise (loosening direction), the inclined side 47a of the triangular protrusion of the tightening tube 46 and the inclined upper surface 230a of the locking convex portion 230 of the inner plug 2α move away from each other without interfering with each other, and the cap 4 and the inner plug 2α do not rotate together.

[0041] In this manner, also in this configuration, the downward projections of the multiple locking lower end steps 47 of the cap 4 and the multiple locking protrusions 230 of the inner plug 2α mesh with each other only in the direction in which the cap 4 is tightened. Note that, although Fig. 6(b) shows an example in which the multiple locking protrusions 230 of the inner plug 2α are two protrusions, the number of locking protrusions 230 in this configuration may be any number as long as it is the same as the downward projections of the tightening tube 46 and the same as the number of threads of the female screw 44 of the cap 4.

[0042] In the two locking recesses 23 of the inside plug in Fig. 3, the inclined surface is inclined over half the circumference and recessed from the other portion, but the locking recesses 23 may be inclined and recessed only partially. On the other hand, in the modified example in Fig. 6, the inclined surface of the two locking protrusions 230 of the inside plug is inclined over 1 / 8 of the circumference, but the locking protrusions 230 may be inclined and raised over half the circumference.

[0043] (Removing and attaching the inner plug) The inner plug 2 is removable from the container body 1. Here, since the discharge hole O formed in the inner plug 2 is small, for example, when the remaining amount of the contents becomes small and difficult to remove, removing the inner plug 2 makes it easier to remove the contents remaining in the container body 1 to the last.

[0044] Furthermore, since the inner stopper 2 is detachable from the container body 1, the container body 1 can be replaced as a refill with respect to the inner stopper 2 and the cap 4. That is, the container body 1 becomes a refill (also called a refill) that can be replaced (removed and replaced) together with the contents. On the other hand, the inner stopper 2 and the cap 4 are reused after replacing the refill.

[0045] Therefore, the empty container body 1 can be replaced with a new refill of the same shape, and the inner plug 2 and the cap 4 can be reused. This reduces the amount of waste resin.

[0046] The container body 1 that can be replaced as a refill can have the upper end of the small diameter opening 14 covered with a film or a cover that surrounds the small diameter opening 14. This allows the container body 1 that is a refill to be distributed alone.

[0047] The inner stopper 2 and the cap 4 may be distributed separately so that a repeat customer who buys and uses a new refill many times can replace the reusable parts when the inner stopper 2 or the cap 4 becomes noticeably dirty, damaged, or deteriorated. Furthermore, as shown in Fig. 9, the cap 6 with the inner stopper 2 engaged with the cap 4 may be distributed.

[0048] Alternatively, since the inner plug 2 is detachable from the container body 1, when the contents run out, the contents may be refilled into the container body 1 from a refillable container such as a pouch.

[0049] (Screw configuration) Here, the configuration of the screw protrusion will be described with reference to Figures 7, 8, and 9. Figure 7 is an enlarged view of the mouth of the container body 1 according to the first embodiment. Figure 8 is an explanatory view of the number of threads and the inclination of the male screw at the mouth of the container body in the first embodiment. Figure 9 is an inner perspective view of the cap with an inside plug according to the first embodiment.

[0050] As described above, the inside plug 2 can be removed from the container body 1 by rotating the inside plug 2 relative to the mouth 13 of the container body 1. Therefore, the inside plug 2 and the container body 1 are not provided with a rotation stopper for the inside plug 2 relative to the container body 1.

[0051] When the inside plug 2 is engaged with the mouth portion 13 of the container body 1 , the female thread 26 of the inside plug 2 engages with the first male thread 15 provided on the small diameter mouth portion 14 located at the upper part of the mouth portion 13 .

[0052] 2 and 5, the cap 4 does not threadably engage with the inside plug 2, but threadably engages only with the mouth portion 13 of the container body 1 in the lateral direction. More specifically, the female thread 44a for engagement of the cap 4 engages with the second male thread 17 provided on the large-diameter mouth portion 16 located at the lower part of the mouth.

[0053] 7, the first male thread 15 and the second male thread 17 have the same thread lead at the mouth 13 of the container body 1. In other words, the first male thread 15 and the second male thread 17, which are helical protrusions, have the same "distance traveled in the axial direction (up and down) when going around the axis along the helix of the thread."

[0054] In detail, in Figure 8, (a) shows an expanded view of the outer peripheral surface of the small diameter part of the mouth of the container body, (b) shows an expanded view of the outer peripheral surface of the large diameter part of the mouth of the container body, and (c) shows a side view of the mouth of the container body.

[0055] In the threads of the mouth 13 of the container body 1, the inclination angle with respect to the axial direction on the outer circumferential surface of the first male thread 15 of the upper small-diameter mouth 14 shown in Fig. 8(a) is the same as that of the second male thread 17 of the lower large-diameter mouth 16 shown in Fig. 8(b). Therefore, when the cap 4 is rotated once relative to the mouth 13, the axial distance (amount of movement) that the cap 4 and the inner plug 2 advance (sink or rise) is equal when the cap 4 is rotated once relative to the mouth 13.

[0056] In this configuration, in the mouth portion 13, as shown in FIG. 2, the thread height (hook height) of the second male thread 17 is higher than the thread height of the first male thread 15. Also, as shown in FIG. 8(a) and FIG. 8(b), the pitch between the threads of the second male thread 17 is about three times the pitch of the first male thread 15. The circumferential length of the outer circumferential surface of the large diameter mouth portion 16 on which the second male thread 17 is provided is less than twice the circumferential length of the outer circumferential surface of the small diameter mouth portion 14 on which the first male thread 15 is provided. Therefore, in this example, the number of threads of the first male thread 15 is greater than the number of threads of the second male thread 17. 7 and 8, the first male thread 15 is a four-start thread consisting of four inclined protrusions 15-1, 15-2, 15-3, and 15-4, and the second male thread 17 is a double-start thread consisting of two inclined protrusions 17-1 and 17-2. Therefore, in this configuration, the female thread 26 of the inside plug 2, which is the screw engagement destination, is a four-start thread, and the female thread 44 of the cap 4 is a double-start thread.

[0057] The first male thread 15 of the mouth portion 13 and the female thread 26 of the inside plug 2, and the second male thread 17 and the female thread 44 of the cap 4 may be single-start threads or multiple-start threads.

[0058] Due to this relationship, as can be seen in the state of the cap 6 with an inner plug shown in Figure 9, the thread lead of the female thread 44 of the engagement tube 43 of the cap 4 and the thread lead of the female thread 26 of the mounting tube 25 of the inner plug 2 are equal.

[0059] Here, Fig. 10 is an explanatory diagram showing the positional relationship of the screws. Fig. 10 is a partially enlarged view of the state in which the container, cap, and inner plug are all assembled, showing a perspective view of the container body 1 and a cross-sectional view of the cap 4 and inner plug 2. Fig. 10(b) is a view in which the mouth of the container body 1 is slightly separated from the cap 4 and inner plug 2 in the assembled state of Fig. 10(a).

[0060] As shown in Figures 10(a) and 10(b), the axial positional relationship between the first male thread 15 and the second male thread 17 at the mouth 13 of the container body 1 is equal to the positional relationship between the thread grooves of the female thread 26 that engages with the first male thread 15 of the inner plug 2 and the lower engaging female thread 44a that engages with the second male thread 17 of the cap 4 in the assembled state.

[0061] With this configuration, when the multiple lower end steps 47 of the tightening tube 46 of the cap 4 engage with the multiple locking recesses 23 on the upper surface of the inner plug 2, the cap 4 and the inner plug 2 can be rotated together relative to the mouth 13 of the container body 1 up to the end of the screw engagement.

[0062] Furthermore, due to this screw configuration, the rotation of the cap 4 relative to the mouth 13 and the rotation of the inner plug 2 relative to the mouth 13 proceed at the same rotational angle, so that when the inner plug 2 rotates together with the cap 4 in the state shown in Figure 5, the distance they advance in the axial direction is the same.

[0063] In this embodiment, the container body 1 is provided with a pair of rotation stopper hooks 19F that act as a rotation stopper for the cap 4, and the cap 4 is provided with rotation stoppers 45A and 45B. Therefore, in this configuration, when the cap 4 and the inside plug 2 rotate together, the timing at which the cap 4 reaches a fully closed position relative to the container body 1 and the rotation stoppers 45A and 45B are stopped by the two rotation stopper hook pairs 19F is the same as the timing at which the inside plug 2 reaches a fully closed position relative to the container body 1.

[0064] (assembly) Next, the assembly of a capped container will be described with reference to Figures 11, 12 and 13. Figure 11 is a flow chart showing the process of assembling a capped container in the manufacturing stage. Figure 12 is a diagram showing the operation of assembling a capped container according to the first embodiment. Note that in Figures 12(d) to 12(f), the cap is shown in a see-through manner to show the positional relationship. Figure 13 is a diagram showing the positional relationship between the female thread of the cap with an inside plug and the male thread of the mouth portion during assembly.

[0065] In step S1 of Fig. 11, the inner plug 2 is fitted into the cap 4. More specifically, the inner plug 2 is pushed into a specified position inside the cap 4 and rotated relative to the cap 4, thereby setting the inner plug 2 inside the cap 4 to form a cap with an inner plug 6 (Fig. 12(a) → Fig. 12(b)).

[0066] Specifically, when the female thread 44 provided on the cap 4 is a thread with two or more threads, the inside plug 2 needs to be fitted into the cap 4 in a state (original position) in which it can be properly assembled to the container body 1, that is, in a predetermined position that is defined in the circumferential direction. For example, if the inside plug 2 is fitted into the cap 4 out of its original position, when the cap 4 is attached to the container 3, the end of the thread groove of the female thread 26 of the inside plug 2 and the end of the first male thread 15 of the container body 1 do not match, and the cap 4 cannot be attached. Even if the threads of the cap 4 and the container body 1 match, the threads of the inside plug 2 and the container body 1 do not match, and the cap 4 cannot be tightened. Therefore, in S1, the inside plug 2 needs to be attached to a specified position where the inside plug 2 and the cap 4 can be properly attached to the container body 1, and at this time, each of the two lower end steps 47 fits into the respective predetermined positions of the two locking recesses 23. Therefore, as shown in FIG. 12(a), it is preferable to mark the cap 4 and the inside plug 2 with stickers, markers, or other marks at the designated positions where the cap 4 and the inside plug 2 will interlock properly when assembling the cap 4 and the inside plug 2, and then press the cap 4 and the inside plug 2 together so that the marks match up.

[0067] Thereafter, by rotating the inside plug 2 to the end, the downward projections of the two lower end steps 47 for locking of the cap 4 and the two multiple locking recesses 23 of the inside plug 2 come into contact (engage) in appropriate pairs as shown in Fig. 5, and the inside plug 2 is in a state where its rotation is restricted in the direction in which the cap 4 is tightened. More specifically, when the inside plug 2 is rotated from the correct position to the end relative to the cap 4 and the lower end steps 47 and the locking recesses 23 are engaged in the correct positions, the inside plug 2 is in a proper state of the cap 6 with the inside plug as shown in Fig. 13. In the proper state of the cap 6 with the inside plug shown in Fig. 13, the axial distance between the thread groove of the female screw 26 of the inside plug 2 and the thread groove of the female screw 44a for engagement of the cap 4 is equal to the axial distance between the first male screw 15 that fits with the inside plug 2 of the mouth portion 13 of the container body 1 and the second male screw 17 that fits with the cap 4.

[0068] In step S2, the cap 6 with the inner plug, which is fully engaged as shown in FIG. 13, is placed on the mouth 13 of the container body 1 filled with the contents (FIG. 12(c)→FIG. 12(d)).

[0069] In step S3, the cap 4 is rotated relative to the mouth 13 of the container body 1 to fasten the cap 6 with the inner plug. At this time, the inner plug 2 also engages with the mouth and is fastened (FIG. 12(d) → FIG. 12(e)). In detail, the cap 4 and the inner plug 2 rotate together relative to the container body 1, and the female thread 44 of the cap 4 engages with the second male thread 17 of the mouth 13 (large diameter mouth 16), and the female thread 26 of the inner plug 2 engages with the first male thread 15 of the mouth 13 (small diameter mouth 14).

[0070] In step S4, the rotation of the cap 4 is completed, the attachment of the inner plug 2 is completed, and the assembly is completed (FIG. 12(e) → FIG. 12(f)). When the rotation of the cap 4 is completed, the rotation stoppers 45A, 45B at the lower end of the engagement tube 43 of the cap 4 are sandwiched between the two rotation stopper hook pairs 19F, and the rotation is stopped.

[0071] In this way, in the present invention, the inner stopper is preliminarily incorporated into the cap during the assembly process, and the inner stopper can be rotated when the cap is rotated. Therefore, even if the screw engagement of the container mouth is in two stages, during production, the mouth end only needs to be closed once after filling the contents, thereby preventing the assembly process from becoming complicated.

[0072] Second embodiment 14 is a partial cross-sectional view of a capped container 5A according to a second embodiment of the container. In the above embodiment, an example was shown in which the nozzle in the inside plug protrudes upward, but the discharge hole in the inside plug does not have to protrude upward.

[0073] In this embodiment, the inside plug 2A is not provided with a nozzle that protrudes upward, and the discharge hole O1 is provided at the same height as or close to the height of the annular upper surface 22A. Therefore, in the cap 4A of this embodiment, the outer peripheral wall 42A, the engagement tube 43A, and the tightening tube 46A are shorter than those in the first embodiment.

[0074] In this embodiment, the multiple locking recesses 23 of the inside plug 2A and the bottom end steps 47 of the cap 4A have the same shapes as those in the first embodiment. Therefore, the downward projections of the multiple locking bottom end steps 47 of the cap 4A and the multiple locking recesses 23 of the inside plug 2A mesh with each other only in the direction in which the cap 4A is tightened.

[0075] In this embodiment, as in the first embodiment, the first male thread 15 and the second male thread 17 have the same thread lead in the mouth portion 13 of the container body 1. The female thread 44 of the engagement tube 43A of the cap 4A and the female thread 26 of the mounting tube 25 of the inside plug 2A have the same thread lead and inclination of the helical protrusions 44, 26. Therefore, the rotation of the cap 4A relative to the mouth portion 13 and the rotation of the inside plug 2A relative to the mouth portion 13 proceed at the same rotation angle, so that when the cap 4A and the inside plug 2A rotate together, the rotation speeds are the same, and no adverse effects are caused.

[0076] Furthermore, in this embodiment, when each of the multiple lower end steps 47 of the cap 4A is engaged in the correct position with each of the locking recesses 23 of the inner plug 2A, the axial distance between the thread groove of the female thread 26 of the inner plug 2A and the thread groove of the engaging female thread 44a of the cap 4A becomes equal to the axial distance between the first male thread 15 and the second male thread 17 of the mouth portion 13 of the container body 1.

[0077] Therefore, in this embodiment as well, by previously assembling the inner stopper into the cap at an appropriate position, the inner stopper and the cap can be tightened together. Therefore, even if the spiral at the container mouth is two-stage, after filling the contents, only one rotation operation is required to close the end of the mouth, simplifying the assembly process.

[0078] Third embodiment FIG. 15 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container 5B according to the third embodiment of the container of the present invention.

[0079] In this embodiment, container 3B further includes a packing 9, which is a sealing member, that is provided on the upper end of small-diameter opening 14 of container body 1 and receives pressure from the underside of annular upper surface 22 of inner plug 2B. In addition, inner plug 2B does not include an intermediate tube between mounting tube 25 and suction tube 29. Other structures of container body 1 and cap 4 are similar to those of cap 4 in the first embodiment.

[0080] In this embodiment, a packing 9 is provided on the small diameter opening 14 of the container body 1, and the packing 9 is pressed into place by the inner plug 2, thereby ensuring airtightness between the container body 1 and the inner plug 2B.

[0081] In this embodiment, the multiple locking recesses 23 of the inner plug 2 and the lower end steps 47 of the tightening tube 46 of the cap have the same shapes as in the first embodiment shown in Figures 3 to 5, and the downward protrusions of the multiple locking lower end steps 87 of the cap 4B and the multiple locking recesses 23 of the inner plug 2B engage with each other only in the direction in which the cap 4B is tightened.

[0082] The first male thread 15 and the second male thread 17 of the container body 1 have the same thread lead. Also in this embodiment, when each of the multiple lower end steps 47 of the cap 4 is engaged with each of the locking recesses 23 of the inside plug 2B at the correct position, the axial distance between the thread groove of the female thread 26 of the inside plug 2B and the thread groove of the engaging female thread 44a of the cap 4 becomes equal to the axial distance between the first male thread 15 and the second male thread 17 of the mouth portion 13 of the container body 1.

[0083] Therefore, in this embodiment as well, by previously assembling the inner stopper into the cap at an appropriate position, the inner stopper and the cap can be tightened together. Therefore, even if the spiral at the container mouth is two-stage, after filling the contents, only one rotation operation is required to close the end of the mouth, thereby preventing the assembly process from becoming complicated.

[0084] In the containers 3A, 3B shown in FIGS. 14 and 15, the locking structure of the annular upper surfaces 22A, 22 of the inside plugs 2A, 2B may also be a structure in which the locking protrusions 230 shown in FIG. 6 are provided.

[0085] (Second example of cap configuration) 16 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container 5C according to a second configuration example of the cap of the present invention. In the following Figs. 16 to 19, the configuration of a container 3 consisting of a container body 1 and an inside plug 2 is the same as in the first embodiment.

[0086] The cap 4C of this configuration example differs from the first embodiment in that it does not have an outer peripheral wall and the top surface 41C is substantially the same as the outer shape of the engagement tube 43, but the other structures are the same as the cap 4 of the first embodiment. In this embodiment, since the cap does not have an outer peripheral wall, the amount of resin used during cap molding can be reduced accordingly. In addition, since there is no outer peripheral wall in this configuration example, the top view of the cap is limited to a circular shape.

[0087] (Third example of cap configuration) FIG. 17 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container 5D according to a third configuration example of the cap of the present invention.

[0088] In the cap 4D of this configuration example, the base of the engagement tube 43D is thick, and the outer periphery of the tightening tube is connected to the inner periphery of the engagement tube. More specifically, in the cap, the tightening tube located on the innermost side is shorter downward than the engagement tube. Therefore, in this configuration, the upper inside of the engagement tube 43D has a step shape, so that the outer periphery of the tightening tube 46D is connected to the inner periphery of the engagement tube 43D.

[0089] In addition, in this configuration, since the engagement tube and the tightening tube are integrated in the cap 4D, it can be adapted even if the mounting tube 25 of the inside plug 2 becomes thinner, for example.

[0090] (Fourth configuration example of the cap) FIG. 18 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container 5E according to a fourth configuration example of the cap of the present invention.

[0091] In this configuration example, as in Fig. 17, the base portion of the engagement tube 43E of the cap 4E is thick, and the outer periphery of the tightening tube 46E is connected to the inner periphery of the engagement tube. Furthermore, as in Fig. 16, the cap 4E does not have an outer periphery wall. Therefore, in this configuration example, since there is no outer periphery wall, the top view of the cap is limited to a circular shape.

[0092] In addition, in this configuration, the engaging tube and the tightening tube are integrated in the cap 4E, so that it can accommodate a thinner mounting tube of the inside plug 2, for example, and the amount of resin in the cap can be reduced compared to the configuration in Figure 17.

[0093] (Fifth example of the cap configuration) Fig. 19 is an enlarged half cross-sectional view of the vicinity of the mouth of a capped container 5F according to a fifth configuration example of the cap of the present invention. Although Figs. 1 to 18 show examples in which the cap is made of one member, the cap may be made of two or more members.

[0094] The cap 4F of this configuration example is composed of two members, an outer cap 7 and an inner cap 8. The outer cap 7 has a top surface 71 and an outer peripheral wall 72. The outer peripheral wall 72 is the outermost cylindrical portion and serves as the outer wall.

[0095] The inner cap 8 is provided inside the outer cap 7, and includes a top surface 85, an engagement tube 83 which is a double tube that hangs down from the top surface 85, and a fastening tube 86, and a stopper projection 88 is provided at the center of the bottom surface of the top surface 85. Furthermore, the inner cap 8 is provided with a fitting tube 81 which fits into the inside surface of the outer peripheral wall 72 of the outer cap 7, and a connecting slope 82 is provided to connect the fitting tube 81 and the lower end of the engagement tube 83. A screw projection (female thread) 84 is provided on the inner peripheral surface of the engagement tube 83. Furthermore, the lower end of the fastening tube 86 is provided with a plurality of lower end steps 87 arranged in an annular shape for engagement.

[0096] In this embodiment, the multiple locking recesses 23 of the inside plug 2 and the bottom end steps 87 provided on the inner cap 8 of the cap 4F have the same shapes as those in the first embodiment shown in Figures 3 to 5. Therefore, the downward projections of the multiple locking bottom end steps 87 of the cap 4F and the multiple locking recesses 23 of the inside plug 2 mesh with each other only in the direction in which the cap 4F is tightened.

[0097] Furthermore, in any of the caps in Figures 16 to 19, when each of the multiple lower end steps 47 of cap 4C (4D, 4E, 4F) is engaged in the correct position with each of the locking recesses 23 of the inner plug 2, the axial distance between the thread groove of the female thread 26 of the inner plug 2 and the thread groove of the engaging female thread 44a (84a) of cap 4C (4D, 4E, 4F) becomes equal to the axial distance between the first male thread 15 and the second male thread 17 of the mouth portion 13 of the container body 1.

[0098] Therefore, in either configuration, by first fitting the inner stopper into the cap in the appropriate position during assembly, the inner stopper and the cap can be tightened together. Therefore, even if the container mouth has a two-stage spiral, after filling the contents, only one rotation operation is required to close the end of the mouth, preventing the assembly process from becoming complicated.

[0099] 16 to 19 show examples of engaging with the configuration of the first embodiment of the inside plug 2, but the caps in Fig. 16 to 19 may be applied to the containers 3A and 3B shown in Fig. 14 and 15. Furthermore, the inside plug attached to a container that engages with the caps in Fig. 16 to 19 may have a structure in which the locking protrusion 230 shown in Fig. 6 is provided as the locking portion.

[0100] <Embodiment 4 of the Cap and Mouth> In the above embodiment, an example has been described in which a rotation stopper is provided on the cap and the mouth of the container body to stop the rotation of the cap. However, a rotation stopper for determining the rotation position of the cap relative to the mouth does not have to be provided. In a configuration in which a rotation stopper is not provided on the cap and the mouth, the timing at which the cap completely closes and stops relative to the container body and the timing at which the inside plug completely closes and stops relative to the container body may be slightly different.

[0101] 20 is a half-sectional explanatory view of the vicinity of the mouth of a capped container according to a modified example of the rotation end point of the inside plug of the present invention. In this embodiment, an elastically deformable packing 9G is provided on the small-diameter opening 14G of the container body 1G, and the packing 9G comes into contact with the inside plug 2G to ensure airtightness between the container body 1G and the inside plug 2G. In addition, the capping projection 48 of the cap 4G comes into contact with the discharge hole O of the inside plug 2G to ensure airtightness between the cap 4G and the inside plug 2G.

[0102] In this embodiment, compared to other embodiments, the protruding length of the nozzle 21G of the inside plug 2G is shorter relative to the size of the cap 4G and the container body 1G, and the mounting tube 25G is slightly longer and the circumferential distance of the female thread 26G is longer. Therefore, in the mouth portion 13G of the container body, the circumferential length of the first male thread 15G is longer relative to the second male thread 17 than in other embodiments. Also, in the cap 4G, the tightening tube 46G is slightly shorter relative to the engagement tube 43 and the outer peripheral wall 42. And, no mechanism is provided for preventing the cap 4G from rotating relative to the container body 1G.

[0103] In this embodiment as well, the thread lead of the female thread 44 of the engagement tube 43 of the cap 4G and the thread lead of the female thread 26G of the mounting tube 25G of the inside plug 2G are equal.

[0104] Furthermore, in this embodiment, when each of the multiple bottom end steps 47 of the cap 4G is engaged with each of the locking recesses 23G of the inside plug 2 at the correct position, the axial distance between the thread groove of the female thread 26G of the inside plug 2 and the thread groove of the engaging female thread 44a of the cap 4G becomes equal to the axial distance between the first male thread 15G and the second male thread 17 of the mouth portion 13G of the container body 1G, as shown by the arrow in Fig. 20(a). In this manner, when the multiple bottom end steps 47 of the tightening tube 46G of the cap 4G are properly engaged with the multiple locking recesses 23G on the upper surface of the inside plug 2G, the cap 4G and the inside plug 2G can be rotated together relative to the container body 1G up to the end of the thread engagement between the cap 4G and the container body 1G.

[0105] However, in this embodiment, since there is no rotation stopper, as the cap 4G continues to be tightened, the outer peripheral wall 42 hits the bottle shoulder 12 or stops at the end point of the screw engagement. At that time, as shown in Figure 20 (a), the inside plug 2G does not have to be completely tightened against the mouth 13G, and this is effective as long as the inside plug 2G comes into contact with the packing 9G to ensure airtightness between the inside plug 2G and the container body 1G. That is, in this embodiment, the inside plug 2G does not tighten completely due to the co-rotation of the inside plug 2G and the cap 4G.

[0106] Then, when opening the cap 4G and using the container 3G, the user can further tighten the inside plug 2G by rotating it alone relative to the container body 1G, as shown in FIG. 20(b).

[0107] In this embodiment, when the cap 4G is tightened again after the inside plug 2G is tightened, the cap 4G is in a completely closed state, and the rotation restriction by the lower end step 47 of the tightening tube 46G of the cap 4G and the multiple locking recesses 23G of the inside plug 2G remains released as shown in Fig. 20(c). Even in this state, the capping projection 48 of the cap 4G contacts the discharge hole O of the inside plug 2G, thereby ensuring airtightness between the cap 4G and the inside plug 2G. In this embodiment, the rotation restriction mechanism by the lower end step 47 and the multiple locking recesses 23G does not come into contact with each other when the inside plug 2G is removed from the container body 1G when refilling the contents or replacing the container body 1G as a refill after assembly at the time of manufacture, but this does not pose a problem.

[0108] In this embodiment, since there is no rotation stopper for regulating the positional relationship between the cap and the container body, the cap is circular in top view so that circumferential positioning is not required. In Fig. 20, a configuration in which an outer peripheral wall is provided on the cap is shown, but as shown in Figs. 16 and 18, the cap may be circular in top view by not providing an outer peripheral wall on the cap.

[0109] In the modified example of the rotation end point in Figure 20, an example of engaging with the configuration of the first embodiment of the inside plug 2 is shown, but the inside plug applied to a capped container having the rotation end point in Figure 20 may have a structure in which the locking protrusion 230 shown in Figure 6 is provided as the locking portion.

[0110] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the embodiments of the present invention described in the claims. [Explanation of symbols]

[0111] 1 Container body 2, 2A inner stopper 3, 3A container 4, 4A, 4B, 4C, 4D, 4E, 4F Cap 5, 5A, 5B, 5C, 5D, 5E, 5F Containers with caps 6 Cap with inner plug 7 Outer cap 8 Inner Cap 9 Gasket (sealing material) 13 Mouth 14 Small diameter mouth 15 First male screw (helical protrusion) 16 Large diameter mouth 17 Second male screw (helical protrusion) 18 Ring protrusion 19 Mouth base 19F Rotation stopper hook pair (rotation stopper) 21, 21G nozzle 23 Locking recess (locking portion) 23a Slanted surface (slanted bottom surface) 23b Vertical surface (recess vertical wall) 230 Locking protrusion (locking portion) 230a Slanted surface (sloped top surface) 230b vertical plane 24 Partition protrusion 240 Partition recess 25 Mounting tube 26 Female thread (inner spiral protrusion) 27 Slit 28 Intermediate tube 29 Suction tube 41 Top 42 Outer wall 43 Engagement tube (cylindrical part) 44 Female thread (inner spiral protrusion) 45A, 45B Rotation stopper 46, 46A tightening tube 47 Lower end step (triangular protrusion, step for locking) 47a Slope side 47b Vertical edge 48 Stopper protrusion

Claims

1. A container with a cap, The container is a container body having a mouth including a small-diameter mouth portion having a first male screw provided on an outer circumferential surface thereof and a large-diameter mouth portion below the small-diameter mouth portion, the large-diameter mouth portion having a larger diameter than the small-diameter mouth portion and a second male screw provided on an outer circumferential surface thereof; a plug having a discharge hole for discharging the contents and a mounting tube having a female screw on an inner circumferential surface thereof; The cap has an engagement tube having a female screw on an inner circumferential surface, The inner plug is removable from the container body, the female thread of the inside plug engages with the first male thread of the mouth portion; the female thread of the cap engages with the second male thread of the mouth portion below the inside plug; The first male thread and the second male thread of the mouth portion have the same thread lead. Container with cap.

2. The axial distance between the first male thread and the second male thread of the mouth portion is equal to the distance between the thread groove of the female thread of the inside plug that fits with the first male thread and the thread groove of the female thread of the cap that fits with the second male thread when the cap and the inside plug are correctly assembled. The capped container according to claim 1.

3. The inside plug is not provided with a rotation stopper relative to the container body, The inside plug can be removed from the container body by rotating the inside plug relative to the mouth. The capped container according to claim 1.

4. The cap is not in threaded engagement with the plug. The capped container according to claim 1.

5. the cap has a tightening tube that is smaller in diameter than the engagement tube and that hangs down from the back surface of the top surface of the cap, the tightening tube being located inside the engagement tube; The inner plug has an annular upper surface that is located outside the discharge hole and connects to an upper end of the mounting cylinder, The lower end of the fastening tube of the cap is provided with a plurality of lower end steps arranged in an annular shape, The annular upper surface of the inside plug is provided with a plurality of locking portions arranged in an annular shape in a top view, The plurality of lower end steps and the plurality of locking portions are formed to engage with each other only in the direction in which the cap is fastened, The cap and the inside plug can rotate together only in the direction in which the cap is fastened relative to the mouth portion. The capped container according to claim 2.

6. The number of the lower end steps of the cap and the number of the locking portions of the inside plug are equal to the number of threads of the female screw of the cap. The capped container according to claim 5.

7. When assembling the inside plug to the cap, the inside plug is pushed into the cap at a specified position in the circumferential direction, and then rotated to the end, so that each of the multiple lower end steps of the cap engages with the locking portion of the inside plug at the correct position, In this state, the axial distance between the groove of the female thread of the inside plug that fits with the first male thread and the groove of the female thread of the cap that fits with the second male thread is equal to the axial distance between the first male thread of the mouth portion and the second male thread. The capped container according to claim 5.

8. A cap with an inner plug, comprising an inner plug to be attached to the mouth of a container body and a cap to be attached to the mouth, The container body has a mouth portion including a small-diameter mouth portion having a first male screw provided on an outer circumferential surface thereof and a large-diameter mouth portion below the small-diameter mouth portion and having a second male screw provided on an outer circumferential surface thereof; The inner plug is formed with a discharge hole for discharging the contents and a mounting tube provided with a female screw. The cap has an engagement tube having a female screw on an inner circumferential surface, The inner plug is removable from the container body, the female thread of the inside plug engages with the first male thread of the mouth portion; the female thread of the cap engages with the second male thread of the mouth portion below the inside plug; The female thread of the inner plug and the female thread of the cap have the same thread lead. Cap with inner plug.

9. A method for assembling a capped container, comprising the steps of: a step of pushing an inner plug having a mounting tube with a female thread formed on an inner peripheral surface into a predetermined position inside a cap having a female thread formed on an inner peripheral surface of a cylindrical portion and rotating the inner plug into the cap; a step of placing a cap having an inner plug attached thereto on the opening of a container body having a small diameter opening with a first male thread provided on an outer circumferential surface thereof and a large diameter opening with a second male thread provided on an outer circumferential surface thereof, the second male thread having a thread lead equal to that of the first male thread; and rotating the cap relative to the container body, so that the inside plug rotates with the cap, and the female thread of the cap engages with the second male thread of the mouth portion and the female thread of the inside plug engages with the first male thread of the mouth portion. How to assemble a container with a cap.

10. The cap has a fastening tube that is suspended from the underside of the top surface and is located inside the tube portion, The inner plug has an annular upper surface that is connected to an upper end of the mounting cylinder, The lower end of the fastening tube of the cap is provided with a plurality of lower end steps arranged in an annular shape, The annular upper surface of the inside plug is provided with a plurality of locking portions arranged in an annular shape in a top view, In the step of fitting the inside plug into the cap, the inside plug is pushed into the cap at the predetermined position that defines the position in the circumferential direction, and then rotated to the end, so that each of the multiple lower end steps of the cap is engaged with the locking portion of the inside plug at the correct position. A method for assembling a capped container according to claim 9.

11. In the step of fitting the inside plug into the cap, when each of the plurality of lower end steps of the cap is engaged with each of the locking portions of the inside plug at a correct position, the axial distance between the thread groove of the female thread of the inside plug that fits with the first male thread and the thread groove of the female thread of the cap that fits with the second male thread becomes equal to the axial distance between the first male thread and the second male thread of the mouth portion. A method for assembling a capped container according to claim 10.

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