JP2019131247A - Double container - Google Patents

Abstract

To create a double container of which an inner container is stored inside an outer container and which has a structure that makes positioning of the circumferential direction on the outer container easy.SOLUTION: A double container comprises: an outer container 2 storing the contents which has an intermittent screw structure comprising a container body screw part 24 formed on the neck cylinder part 23 and a screw notch part 25 formed by deleting a part of the container body screw part 24 at multiple positions of the neck cylinder part 23; an outer container 2 which has an annular peripheral wall 34 that hangs down from the edge of the flange 33 that extends to the opening end, multiple grip parts 35 provided at the lower end of the annular peripheral wall part 34 and fitted into the screw notch part 25 and having a screw shape formed in continuation to the container body screw part 24 on the outer surface, and can store an inner container 3; an outer package lid 4 covering the outer container 2; and is structured as such that an annular part 28 of which a positioning recess 28a is formed at one circumferential position around the neck cylinder part 23 of the outer container 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a double container in which an inner container is accommodated in an outer container.

  2. Description of the Related Art Conventionally, a double container including an inner container that stores contents such as cream and an outer container that detachably stores the inner container is known. Such an inner container is a refill container that can be taken in and out of the outer container, and can be reused by removing the inner container stored in the outer container by a consumer and replacing it with a new inner container. (See, for example, Patent Document 1).

In such a double container, an attempt is made to improve design by performing decoration by printing or transferring (hereinafter, referred to as printing or the like) various patterns or characters on the surface of the outer container. The decoration of the outer container 2 is performed with the outer container mounted on a receiving jig for decoration. However, in order to print patterns and characters on the same position in all outer containers, It is necessary to accurately position the outer container in the circumferential direction with respect to the jig.
FIG. 9 is a partial cross-sectional view showing a state before positioning immediately after an outer container as a conventional example is mounted on a receiving jig for decoration. For example, as shown in FIG. 9, a screw notch 103 for dividing the screw portion 102 along the axial direction of the outer container 2 is formed in the neck tube portion 101 of the outer container 100, and a positioning pin 111 is provided on the receiving jig 110 side. The outer container 100 is rotated in the circumferential direction in a state where the outer container 100 is mounted on the receiving jig 110, and the positioning pin 111 is fitted into the screw notch 103, thereby positioning the outer container 100 in the circumferential direction. Has been done.

JP 2011-116401 A

By the way, FIG. 10 is a side view showing an exploded state of an inner container and an outer container of a double container that the applicant of the present application previously applied for a patent (Japanese Patent Application No. 2016-169121) as a conventional example.
This double container includes an inner container 3 for storing contents and an outer container 2 for storing the inner container 3, and a container body screw part 24 is provided on the neck tube part 23 of the outer container 2. Screw notches 25 having a container body screw portion 24 as an intermittent screw structure are provided at two positions that are axially symmetric with respect to the outer peripheral surface of the neck tube portion 23. In addition, an annular peripheral wall 34 is suspended from the end edge of the outer flange-shaped flange 33 at two positions that are axially symmetric with respect to the inner container 3, and a grip portion 35 of a substantially rectangular plate piece is also provided as an extended suspension. Has been. When the inner container 3 is stored in the outer container 2, the grip portions 35 are respectively inserted into the screw notches 25 of the outer container 2. On the surface of the grip portion 35, a slip stopper 36 is provided which is continuous with the container body screw portion 24 on the outer container 2 side and has the same screw shape as the container body screw portion 24.

  However, when printing or the like on the outer container 2 of such a double container, the outer container 2 is placed in the circumferential direction in a state where the outer container 2 is mounted on the receiving jig 110 provided with the positioning pins 111 as described above. If the positioning pin 111 is to be rotated and positioned, the positioning pin 111 can be fitted into both of the screw notches 25 formed at two locations that are axially symmetric with respect to the outer container 2. There is a problem that the positioning in the direction cannot be performed reliably.

  In order to solve the above-described problems in the prior art, the present invention facilitates the positioning of the outer container mounted on the decorative receiving jig in the circumferential direction in a double container in which the inner container is accommodated in the outer container. The challenge is to create a double container that can be done.

Among the means for solving the above problems, the main means of the present invention is as follows.
It has an intermittent screw structure comprising a container body screw portion formed in the neck tube portion, and a screw notch portion formed by deleting a part of the container body screw portion at a plurality of positions of the neck tube portion. An outer container for storing objects,
An annular peripheral wall portion that hangs down from the edge of the flange portion that extends to the open end, and a screw shape that is provided at the lower end of the annular peripheral wall portion and fits into the screw notch portion and continues to the container body screw portion on the outer surface. An outer container having a plurality of grip portions formed and capable of accommodating the inner container;
A double container provided with an outer lid attached to the outer container.
It is said that an annular portion having a positioning recess formed in one place in the circumferential direction is provided around the neck tube portion of the outer container.

  In the main means of the present invention of the present invention, even in an outer container having a configuration in which screw notches are formed at a plurality of positions, positioning is performed in the circumferential direction of the outer container, and only the positioning recess provided at one position in the circumferential direction. Can be done.

  According to another aspect of the present invention, in the above-described means, a positioning concave portion is formed between the neck tube portion and the body wall portion and at a position directly below the screw notch portion. is there.

  In the above means, the position where the screw notch portion is formed in the circumferential direction can be matched with the position where the positioning recess is formed, so that the positioning pin can be fitted into the positioning recess without contacting the container body screw portion. It becomes.

  In addition, another means of the present invention is the one of the above means, in which the positioning recess is formed at a position that is in the radial direction and orthogonal to the parting line of the outer container. is there.

  In the above-mentioned means, both end faces of the annular portion forming the positioning recess can be formed along the orthogonal direction, which is the direction in which the mold moves at the time of mold release, so that the positioning pin comes off from the positioning recess during positioning. Can be prevented.

  According to another means of the present invention, in any one of the above means, the annular portion is formed to have an outer diameter dimension that is equal to or larger than the container body screw portion formed in the neck tube portion and smaller than the waist wall. Is added.

  In the above means, in the above means, at the time of positioning, the positioning pin can be surely fitted into the positioning recess formed in the annular portion.

  According to another means of the present invention, in any one of the above means, a means that the annular part is a neck ring provided between the trunk wall part and the neck tube part is added.

  Alternatively, in any one of the above means, a means is added in which the annular part is an annular step part provided between the trunk wall part and the neck tube part.

  In any of the above means, it is possible to form a positioning recess for positioning in the outer container while maintaining a sense of unity in the outer appearance design of the outer container.

In the present invention, since the positioning in the circumferential direction can be performed using a positioning recess formed in one place of the annular portion of the outer container, the outer container has screw notches formed in a plurality of locations. Also, positioning in the circumferential direction can be reliably performed.
Further, by forming the positioning recess in the neck ring or the annular stepped portion, it is possible to maintain a sense of unity in the external design of the outer container.

It is a front view of the double container which shows 1st Example of this invention. It is a side view of 1st Example. It is a front view which shows the decomposition | disassembly state of an inner container and an outer container in 1st Example. It is a side view which shows the decomposition | disassembly state of an inner container and an outer container in 1st Example. The state which attached the outer container of 1st Example to the receiving jig for decoration is shown, A is a fragmentary sectional view which shows the state before positioning immediately after mounting | wearing, B is a half sectional view which shows the state after positioning. is there. The example which provided the screw notch part different from a present Example in a double container is shown, A is a top view of a double container, B is the side view. It is a side view of the double container which shows 2nd Example of this invention. The state which attached the outer container of 2nd Example to the receiving jig for decoration is shown, A is a fragmentary sectional view which shows the state before positioning immediately after mounting | wearing, B is a half sectional view which shows the state after positioning. is there. It is a partial sectional view showing a state before positioning immediately after mounting an outer container as a conventional example on a receiving jig for decoration. It is a side view which shows the decomposition | disassembly state of the inner container and outer container of the double container which the applicant of this application applied for a patent as a prior art example.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view of a double container showing a first embodiment of the present invention, FIG. 2 is a side view of the first embodiment, and FIG. 3 is a front view showing an exploded state of an inner container and an outer container in the first embodiment. FIG. 4 is a side view showing an exploded state of the inner container and the outer container in the first embodiment, FIG. 5 shows a state where the outer container of the first embodiment is mounted on a receiving jig for decoration, and A is Partial sectional view showing a state immediately after mounting and before positioning, B is a half sectional view showing a state after positioning, FIG. 6 shows an example in which a screw notch portion different from the present embodiment is provided in a double container, A is a top view of a double container, B is the side view.

As shown in FIG. 1, a double container 1 according to the present invention includes an inner container 3 capable of accommodating contents such as cream, an outer container 2 capable of accommodating the inner container 3 therein, and an outer container 2. And an exterior lid 4 to be attached to the upper part.
As shown in FIG. 2, FIG. 3, or FIG. 4, the outer container 2 and the inner container 3 are each formed in a bottomed cylindrical shape, and are arranged so that the central axes are located on a common axis. Hereinafter, this common axis is referred to as an axis O, the bottom wall portion 22 of the outer container 2 and the bottom wall 32 of the inner container 3 described later along the axis O direction are referred to as a lower side, and the opposite side is referred to as an upper side. A direction perpendicular to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

  The outer container 2 is a bottomed cylindrical outer container having an open upper end, and is provided in a substantially cylindrical body wall portion 21 extending along the axis O and a lower portion of the body wall portion 21. A bottom wall portion 22. The outer container 2 is made of, for example, a synthetic resin such as polyester, polystyrene, or polyolefin, glass, metal, or the like, and is molded by, for example, injection molding, blow molding, press molding, or the like.

On the upper side of the body wall portion 21, a neck tube portion 23 whose outer peripheral surface is reduced in diameter over the entire circumference is erected. A container body screw portion 24 made of a male screw is provided on the outer peripheral surface of the neck tube portion 23. By making the container body screw portion 24 into an intermittent screw structure, a screw notch portion is formed on the outer peripheral surface of the neck tube portion 23. 25 is formed. As shown in FIG. 3, the screw notch 25 is formed by a notch formed by notching the upper portion of the neck tube 23 in a concave shape in a side view in order to insert a grip 35 of the inner container 3 to be described later. The screw notch 25 extends downward along the direction of the axis O from the upper end of the neck tube 23, and only the outer peripheral portion is partially cut away while leaving the inner periphery of the neck tube 23. . That is, the screw notch 25 has a concave shape with the radially outer side opened in a plan view (not shown), and the radially inner side is formed thin along the inner peripheral surface of the trunk wall 21. The screw notches 25 having such a configuration are formed at two positions that are axially symmetric with respect to the axis O, respectively. A mouth tube portion 26 is formed on the upper side of the neck tube portion 23 in a form in which the inner peripheral surface of the neck tube portion 23 extends upward, and a plurality of positions in the circumferential direction of the outer peripheral surface of the mouth tube portion 26 are An outer container side locking projection 27 is provided to project.
Further, a neck ring 28A as one mode of the annular portion 28 is provided on the outer peripheral surface of the neck tube portion 23 and below the screw notch 25, and a part of the neck ring 28A is cut away. A positioning concave portion 28a formed by dividing is provided at a position immediately below the screw notch 25 (see FIGS. 2 and 4). The outer diameter dimension of the neck ring 28 </ b> A is equal to or larger than the outer diameter dimension of the container body screw portion 24 (the male screw provided in the container body screw portion 24) and smaller than the outer wall size of the trunk wall portion 21. . Furthermore, by providing the positioning recess 28 a at a position directly below the screw notch 25, it is possible to maintain a sense of unity in the external design of the outer container 2.

  As shown in FIGS. 3 and 4, the inner container 3 is a container that can be inserted into and removed from the outer container 2 and is a refill container that can be appropriately replaced by a consumer. As a schematic configuration of the inner container 3, a substantially cylindrical peripheral wall portion 31 extending along the axis O and a bottom wall portion 32 provided at a lower portion of the peripheral wall portion 31 are provided. The inner container 3 is a bottomed cylindrical interior container having an opening at the upper end, and is made of a synthetic resin such as polyester, polystyrene, or polyolefin, and is formed by, for example, injection molding or blow molding.

  At the upper end portion of the peripheral wall portion 31, an outer flange-shaped flange portion 33 that is attached to the upper end surface of the mouth tube portion 26 of the outer container 2 is formed. An annular peripheral wall portion 34 is suspended from the edge of the flange portion 33, and a grip portion 35 fitted into the screw notch 25 described above when the inner container 3 is inserted into the outer container 2. Is extended. The grip portion 35 is a substantially rectangular plate piece that hangs down in the axial direction from the lower end of the annular peripheral wall portion 34. Like the screw notch portion 25, the grip portion 35 is located at two positions that are symmetric with respect to the axis O. Is formed. On the outer surface of the grip portion 35, the container body screw portion 24 is configured so that when the grip portion 35 is fitted into the screw notch portion 25, a male screw can be formed continuously with the container body screw portion 24 on the outer container 2 side. A slip stopper 36 having the same screw shape is formed. By making the shape of the slip stopper 36 into a screw shape, the grip portion 35 can be held while maintaining a sense of unity of the external design by making the screw portion appear to be continuous when using the container with the outer lid 4 removed. The anti-slip effect when grasped with a fingertip can be exhibited.

On the inner peripheral surface of the annular peripheral wall portion 34, an inner container side locking projection 37 is projected at a position facing the outer container side locking projection 27, and when the inner container 3 is stored in the outer container 2. The flange portion 33 of the inner container 3 is fitted to the upper end surface of the mouth tube portion 26 of the outer container 2 by the inner container side locking projection 37 getting over and engaging the outer container side locking projection 27 downward. It is a structure and can prevent that the inner container 3 falls from the outer container 2 at the time of use etc.
The outer diameter of the peripheral wall portion 31 of the inner container 3 is formed to have the same diameter as or slightly smaller than the inner diameter of the body wall portion 21 of the outer container 2. Can be easily stored.

  The exterior lid 4 is a top-like cylindrical overcap body that is screwed to the neck tube portion 23 of the outer container 2, and includes a disk-shaped top wall portion 41 disposed orthogonal to the axis O, And a cylindrical peripheral wall portion 42 depending from the edge of the wall portion 41. On the inner peripheral surface of the peripheral wall portion 42, an outer cover screw portion 43 is formed which is formed of a female screw that can be screwed to both the container body screw portion 24 of the outer container 2 and the screw-shaped slip stopper 36 of the inner container 3. Yes. A disc-shaped packing 5 is fitted inside the outer lid 4. The packing 5 is joined to the lower surface of the top wall portion 41 of the outer lid 4, and the outer peripheral portion of the packing 5 is connected to the lower surface of the top wall portion 41 of the outer lid 4 and the upper end surface of the flange portion 33 of the inner container 3. The inner container 3 is hermetically sealed.

Next, positioning in the circumferential direction of the outer container 2 performed when decorating by printing or the like on the outer peripheral surface of the outer container 2 of the double container having the above configuration will be described.
FIG. 5 shows a state where the outer container of the first embodiment is mounted on a receiving jig for decoration, A is a side view showing a state immediately after mounting and before positioning, and B is a half sectional view showing a state after positioning. is there.
As shown to FIG. 5A, the decoration to the outer container 2 is performed in the state which mounted | wore the receiving jig 50 for the outer container 2 with the decoration.
The receiving jig 50 includes a base 51, a support 52 that protrudes from the base 51 and is inserted into the outer container 2 and supports the outer container 2 so as to be rotatable in the circumferential direction, and a rotating shaft 53 provided on the base 51. In the center, a positioning member 54 provided with a positioning pin 54a at the tip so as to be swingable, a coil spring provided between the base 51 and the positioning member 54 and biasing the positioning pin 54a in the counterclockwise direction shown in the figure. And an urging member 55 made of The positioning pin 54 a extending from the base 51 side toward the support portion 52 is installed in a state of being biased in the counterclockwise direction shown in the drawing around the rotation shaft 53. For this reason, when the outer container 2 is attached to the support portion 52 of the jig 50, the positioning pin 54a is set to press the container body screw portion 24 of the outer container 2 in the direction of the axis O.

Here, as described above, the outer diameter of the neck ring 28A is equal to or larger than the container body screw portion 24, that is, the same outer diameter as the container body screw portion 24 or larger than the container body screw portion 24. Is formed. For this reason, the positioning pin 54a abuts on the neck ring 28A or the container body screw portion 24, and has a horizontal posture (not shown) (when the neck ring 28A and the container body screw portion 24 have the same dimensions) or a tip as shown in FIG. 5A. It is set to a tilted posture with a slightly raised right shoulder.
Then, the outer container 2 is rotated around the axis O from this state. Then, as shown in FIG. 5B, when the positioning pin 54a reaches a position directly above the positioning recess 28a, the positioning pin 54a fits into the positioning recess 28a and restricts further rotation of the outer container 2. The outer container 2 can be positioned in the circumferential direction.
The position where the positioning pin 54a has reached the position directly above the positioning recess 28a is also the position where the positioning pin 54a faces the screw notch 25, so that the positioning pin 54a does not contact the container body screw portion 24. It can be fitted into the positioning recess 28a.
Further, even if the positioning pin 54a faces the screw notch 25 on the side not having the positioning recess 28a (the opposite side which is symmetric with respect to the axis), the positioning recess 28a is not formed at this position. Positioning is never achieved. That is, in this outer container 2, since it can position reliably only by the positioning recessed part 28a provided in one place of the circumferential direction, it becomes possible to perform subsequent printing etc. correctly.

By the way, the outer container 2 is formed by an injection molding method using a pair of molds. However, when the pair of molds are released after being molded, the outer container 2 becomes axially symmetric among the surfaces of the body wall portion 21 of the outer container 2. Parting lines PL extending in a straight line in the vertical direction are thinly formed at two positions. Here, for example, as shown in FIGS. 6A and 6B, when the positioning recess 28a is formed at the position B deviated from the position orthogonal to the parting line PL, the positioning recess 28a is interposed in the circumferential direction. Both end faces (both end faces of the annular portion) 28b of the opposing neck ring 28A are formed along the direction of releasing (the arrow direction shown in FIG. 6A). When viewed from the axis O, one end surface 28b of the both end surfaces 28b is formed with a gentle inclination angle θ. For this reason, when the same positioning as described above is performed on the outer container 2 having such a positioning recess 28a, the positioning pin 54a once fitted in the positioning recess 28a may be rotated during the subsequent rotation depending on the rotation direction of the outer container 2. , It may deviate from one end face 28b having a gentle inclination angle θ, and as a result, positioning may not be possible.
On the other hand, when the positioning recess 28a is formed at a position A that is in the radial direction and orthogonal to the parting line PL, the both end faces 28b are formed in parallel along the direction in which they are released. A loose inclination angle is not formed, and as a result, the positioning pin 54a can be prevented from coming off from the positioning recess 28a during the rotation without depending on the rotation direction of the outer container 2, so that the positioning of the outer container 2 is ensured. Can be done. Therefore, it is preferable that the positioning recess 28a is formed at a position A that is in the radial direction and orthogonal to the parting line PL.

FIG. 7 is a side view of a double container showing a second embodiment of the present invention, FIG. 8 shows a state where the outer container of the second embodiment is mounted on a receiving jig for decoration, and A is immediately after mounting and before positioning FIG. 4B is a partial cross-sectional view showing the state of FIG. 1, and B is a half cross-sectional view showing the state after positioning.
The difference between the double container shown in FIG. 7 as the second embodiment and the first embodiment lies in the configuration of the annular portion 28 in which the positioning recess 28a is formed, and other configurations and effects are the same as those of the first embodiment described above. It is the same as that of an Example. For this reason, in the following description, differences from the first embodiment will be mainly described. The same members as those used in the first embodiment will be described with the same reference numerals.

As shown in FIG. 7, the double container of the second embodiment is configured to have an annular step portion 28B instead of the neck ring 28A. The annular step portion 28 </ b> B is formed between the trunk wall portion 21 and the neck tube portion 23 as an annular band-shaped step having a smaller outer diameter than the trunk wall portion 21 and larger than the neck tube portion 23. ing.
The outer diameter of the annular stepped portion 28 </ b> B is equal to or larger than the outer diameter size of the container body screw portion 24 and smaller than the outer wall size of the body wall portion 21. Therefore, as shown in FIG. 8A, when such an outer container 2 is attached to the support portion 52 of the jig 50, the positioning pin 54a is connected to the container body screw portion 24 or the annular step portion 28B, as in the first embodiment. Is set to a horizontal posture (not shown) (when the annular stepped portion 28B and the container body screw portion 24 have the same dimensions) or an inclined posture with a right shoulder lowered with the tip slightly lifted as shown in FIG. 8A.
Then, when the outer container 2 is rotated around the axis O in the same manner as described above, as shown in FIG. 8B, when the positioning recess 28a of the annular step portion 28B reaches the position directly above, the positioning pin 54a is moved to the positioning recess 28a. It is possible to restrict the rotation of the outer container 2 beyond this and position the outer container 2 in the circumferential direction with certainty.

As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.
For example, in the above-described embodiment, the configuration is such that the screw notch portion 25 on the outer container 2 side and the grip portion 35 on the inner container 3 side fitted to the outer container 2 side are formed at two positions that are axially symmetric with respect to the axis O. As shown and described, if the screw notch portion 25 and the grip portion 35 are arranged in a one-to-one correspondence with each other, a configuration formed at a plurality of positions at two or more locations may be used.

  In the above embodiment, the case where the outer diameter of the neck ring 28 </ b> A or the annular stepped portion 28 </ b> B constituting the annular portion 28 is greater than or equal to the container body screw portion 24 has been described. It can also be a diameter. In this case, when the outer container 2 is received and attached to the support portion 52 of the jig 50, the positioning pin 54 a comes into contact with the container body screw portion 24. When the outer container 2 is rotated about the axis O, the positioning pin 54a slides in the circumferential direction on the container body screw portion 24, and when reaching the screw notch portion 25, the neck ring 28A is removed from the container body screw portion 24. Or it falls on the annular stepped portion 28B. When the outer container 2 is continuously rotated, the positioning pin 54a slides on the neck ring 28A or the annular stepped portion 28B and fits into the positioning recess 28a when reaching the position facing the positioning recess 28a. Become. Therefore, the outer container 2 can be positioned in the circumferential direction as described above.

  INDUSTRIAL APPLICABILITY The present invention can be used in a wider area in the field of double containers where the outer container needs to be positioned and printed.

DESCRIPTION OF SYMBOLS 1; Double container 2; Outer container 3; Inner container 4; Exterior lid 5; Packing 21; Body wall part 22; Bottom wall part 23; Neck cylinder part 24; Container body screw part 25; Part 27; outer container side locking projection 28; annular part 28A; neck ring (annular part)
28B; Annular step (annular part)
28a; positioning recess 28b; end surface 31 of the annular part; peripheral wall part 32; bottom wall part 33; flange part 34; annular peripheral wall part 35; grip part 36; anti-slip rib 37; Wall part 42; Peripheral wall part 43; Exterior cover screw part 50; Decoration receiving jig 51; Base 52; Support part 53; Rotating shaft 54; Positioning member 54a; Positioning pin 55; Energizing member O; Axis PL; Gline θ: Loose angle of inclination

Claims (6)

The container body screw part (24) formed in the neck tube part (23), and a part of the container body screw part (24) is missing at a plurality of positions of the neck tube part (23). An outer container (2) having an intermittent screw structure comprising a screw notch (25) and containing the contents;
An annular peripheral wall portion (34) suspended from the edge of the flange portion (33) extending to the opening end, and provided at the lower end of the annular peripheral wall portion (34) and fitted into the screw notch portion (25) And an outer container (2) having a plurality of grip portions (35) formed on the outer surface thereof and having a thread shape continuous to the container body screw portion (24), and capable of storing the inner container (3); ,
An outer lid (4) attached to the outer container (2), and a double container comprising:
A double container characterized in that an annular part (28) in which a positioning recess (28a) is formed at one place in the circumferential direction is provided in the neck tube part (23) of the outer container (2). .   The double container according to claim 1, wherein the positioning recess is formed between the neck tube portion (23) and the body wall portion (21) and at a position directly below the screw notch portion (25).   The double container according to claim 1 or 2, wherein the positioning recess is formed at a position that is perpendicular to the parting line (PL) of the outer container (2) in the radial direction.   The annular portion (28) is formed so as to have an outer diameter that is equal to or larger than the container body screw portion (24) formed in the neck tube portion (23) and smaller than the trunk peripheral wall (21). The double container as described in any one of thru | or 3.   The double container according to any one of claims 1 to 4, wherein the annular portion (28) is a neck ring (28A) provided between the trunk wall portion (21) and the neck tube portion (23). .   The double ring according to any one of claims 1 to 4, wherein the annular portion (28) is an annular step portion (28B) provided between the trunk wall portion (21) and the neck tube portion (23). container.

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