JP2000016444A - Sealed container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed container having a packing member in which its fitting to a cap may easily be carried out, a positive sealing of it when the cap is screwed is attained, its diameter is set to be larger against a resiliency when the cap is fitted or removed and at the same time its resiliency is recovered to reduce the elastic fatigue. SOLUTION: There are provided a container 1 having an opening neck 3 raised therefrom; and a cap 11 having an inner cylinder 15, a middle cylinder 16 and an outer cylinder 14 suspended vertically from a top wall 13 and having an opening neck thread fitting female screw at the lower half part of the outer cylinder. A circumferential wall 22 rising from an outer circumference of a bottom plate 23 can be freely inserted into the opening neck, an inner resilient cylinder 24 fitted to an outer surface of the lower part of the inner cylinder is erected from the upper end of the circumferential wall, an outer surface of an outward flange 26 at the lower end of the outer resilient cylinder 25 suspended from the upper end of the cylinder is engaged with an upper surface of an engaging protrusion 17 circumferentially arranged at the inner surface of the lower part of upper half part of the outer cylinder, the inner cylinder 15 is put in under fastening of the cap to cause the circumferential wall 22 to be expanded at its diameter, the outer surface is brought into press contact with the inner surface of the opening neck part, the upper end surface of the opening neck part and the lower end surface of the middle cylinder can hold the outward flange 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sealed container.

[0002]

2. Description of the Related Art A sealed container is used, for example, as a container for accommodating a granular material. Usually, a cap provided with a packing on the lower surface of a top wall is screwed into a mouth and a neck portion of the container body, and the packing is attached to the mouth and neck. The upper end surface of the cap and the lower surface of the cap top wall are held in a watertight or airtight manner.

[0003]

SUMMARY OF THE INVENTION The present invention provides a packing member having a special structure, which can be mounted on the cap simply by pushing and fitting the member into the cap, and the cap to the mouth and neck of the container body. When screwed and tightened, the peripheral wall of the packing member expands against the elasticity, the packing member seals hermetically at two places, the upper inner surface and the upper end surface of the mouth and neck, and when the cap is further unscrewed, the packing member becomes It is provided so as to be able to return to its original state in the cap, so that the elastic fatigue of the packing member is reduced.

[0004]

As a first means, a body 2 is provided.
The container body 1 having the male screw 4 attached to the lower half outer surface of the mouth and neck 3 rising from the upper end, and the female screw 12 screwed to the male screw,
An inner cylinder 15 having an outer diameter smaller than the upper inner diameter of the mouth and neck, and an inner cylinder 15 having a smaller outer diameter than the upper inner diameter of the mouth and neck, and being provided on the lower half inner surface of the outer cylinder 14 suspended from the outer periphery of the top wall 13 and having an upper inner diameter of the mouth and neck A cap 11 having a larger inner diameter and a smaller outer diameter than the outer diameter, respectively, hanging down from the top wall 13, and a cap 11 having an engaging projection 17 provided on the lower inner surface of the upper half of the outer cylinder 14. And a first elastic packing member 21 mounted in the cap, and the first packing member includes a peripheral wall 22 that can be loosely inserted into the mouth and neck and can expand in diameter against elasticity. The inner elastic tube is raised from the outer periphery of the bottom plate 23 and fitted to the lower outer surface of the inner cylinder 15 from the outer periphery of the upper end of the peripheral wall.
24, an outer elastic cylinder 25 having an outer diameter smaller than the inner diameter of the inner cylinder 15 is folded down from the upper end of the inner elastic cylinder in a folded manner, and an outward flange 26 attached to the lower end of the outer elastic cylinder is attached to the outer cylinder 14. And the inner surface of the peripheral wall 22 has an inner diameter
15 The diameter of the peripheral wall shall be smaller than the outer diameter, and the thickness of the peripheral wall shall be larger than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder, and at least one of the upper end surface of the peripheral wall and the lower end surface of the inner cylinder shall have an upper large diameter. When the cap 11 with the first packing member is screwed into the mouth and neck of the container body, the inner cylinder 15 is fitted into the peripheral wall 22 while expanding in diameter against the elasticity. The outer surface of the peripheral wall 22 is airtightly pressed against the inner surface of the mouth and neck 3, and at this time, the lower end surface of the middle cylinder 16 is not able to airtightly clamp the outward flange 26 between the inner surface of the mouth and neck 3 and the cap is unscrewed. Sometimes, the peripheral wall 22 is formed so as to be able to be reduced in diameter by elastic recovery by extracting the inner cylinder 15.

[0005] As a second means, a container body 1 having a male screw 4 attached to a lower half outer surface of a mouth-neck portion 3 rising from an upper end of a body portion 2;
An inner cylinder 15 having an outer diameter smaller than the upper inner diameter of the mouth and neck portion 3 and an outer cylinder 14 having a female screw 12 screwed to the male screw on a lower half inner surface.
And the cap 11 having the engaging projections 17 provided on the lower inner surface of the upper half of the outer cylinder at the same time as being vertically suspended from the top wall 13, and being capable of being loosely inserted into the mouth and neck and resisting elasticity. Expandable peripheral wall 32
Is raised from the outer periphery of the bottom plate 33, the upper end of the peripheral wall is set to a large inner diameter, the large inner diameter portion 34 is fitted to the lower outer surface of the inner cylinder 15, and the outward flange 35 attached to the outer surface of the large inner diameter portion is removed. A second packing member 31 rich in elasticity, which is slidably fitted into the upper half portion of the cylinder and whose outer peripheral portion is engaged with the upper surface of the engaging ridge 17, wherein the inner diameter of the peripheral wall is the outer diameter of the inner cylinder. And the wall thickness of the peripheral wall is greater than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder 15, and at least one of the bottom surface of the large inner diameter portion and the lower end surface of the inner cylinder 15 is at the top. When the cap with the second packing member is screwed into the mouth and neck of the container body, the inner cylinder 15 is expanded against the elasticity so as to have a large diameter tapered surface.
At the same time, the outer surface of the peripheral wall 32 hermetically presses against the inner surface of the mouth-neck portion 3, and at this time, the top wall portion between the inner and outer cylinders faces the outer flange 35 between the upper end surface of the mouth-neck portion 3. Can be airtightly clamped, and when the cap is unscrewed, the inner wall 15 is withdrawn so that the peripheral wall 32 can be reduced in diameter by elastic restoration.

[0006] As a third means, a container body 1 having a male screw 4 attached to the lower half outer surface of the mouth and neck 3 rising from the upper end of the body 2;
An inner cylinder 15 having an outer diameter smaller than the upper inner diameter of the mouth and neck, and an outer cylinder 14 having a female screw 12 on the lower half inner surface to be screwed to the male screw are respectively provided vertically from the top wall 13 and the outer cylinder is provided. 14 A cap 11 having an engaging ridge 17 provided on the lower inner surface of the upper half, and a bottom plate 42
From the outer periphery, downwardly outward, a peripheral wall 43 which is thicker than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder and which can be expanded against the elasticity is hung down and the outer wall provided at the lower end of the peripheral wall. By fitting the orientation flange 44 into the outer cylinder and engaging with the upper surface of the engaging ridge 17, the third packing member 41, which is mounted in the cap and has high elasticity, comprises the third packing member 41. 3 By screwing the cap with the packing member onto the mouth and neck of the container body, the inner cylinder 15 elastically deforms the bottom plate 42 and the peripheral wall 43 in an inverted manner, and the peripheral wall 43 is in contact with the inner cylinder 15 and the upper part of the mouth and neck. And the outward flange 44 can be airtightly clamped between the upper end surface of the mouth and neck and the top wall portion between the inner and outer cylinders. It was formed to be able to return elastically.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment shown in FIGS. 1 and 2 will be described. Reference numeral 1 denotes a container body, and a mouth and neck 3 is erected from the upper end of a body 2 via a shoulder. The upper part of the mouth and neck has a small inner diameter and a small outer diameter, and a male screw 4 for cap screwing is attached to the outer surface of the lower mouth and neck part.

A cap 11 has a female screw 12 screwed to the male screw provided on the lower half inner surface of an outer cylinder 14 hanging down from the outer periphery of a top wall 13 and an inner cylinder 15 having an outer diameter smaller than the upper inner diameter of the mouth and neck.
And a middle cylinder 16 that is shorter than the inner cylinder and larger in inner diameter than the upper inner diameter of the mouth and neck and smaller in outer diameter than the outer diameter, respectively.
Hanging from 13. An engagement protrusion 17 for engaging a packing member described later is provided around the lower inner surface of the upper half of the outer cylinder 14. The inner cylinder 15 has substantially the same length as the upper half of the outer cylinder, and the middle cylinder 16 has approximately half the length of the outer cylinder.

A first packing member 21 having elasticity is mounted in the cap. As shown in FIG. 2, the member stands up from the outer periphery of the bottom plate 23 and can be freely inserted into the mouth and neck portion 3 and expands its diameter against the elasticity. The inner elastic cylinder is fitted to the lower half outer surface of cylinder 15
The outer elastic cylinder 25 having an outer diameter smaller than the inner diameter of the inner cylinder 16 is folded down from the upper end of the inner elastic cylinder in a folded shape, and an outward flange 26 attached to the lower end of the outer elastic cylinder is attached to the outer cylinder 14. And the lower edge of the outer peripheral portion of the flange is engaged with the upper surface of the engaging ridge 17. The inner diameter of the peripheral wall 22 is smaller than the outer diameter of the inner cylinder 15, and at least one of the upper end surface of the peripheral wall and the lower end surface of the inner cylinder is an upper large-diameter tapered surface. The tapered surface will be described later.

As shown in FIG. 1, when the inner cylinder 15 is forcibly inserted into the peripheral wall when the cap 11 is screwed into the peripheral wall 22, the peripheral wall 22 expands in diameter against the elasticity. It is provided so as to be pressed against the inner surface of the upper part of the mouth and neck airtightly. In order to enlarge the outer peripheral portion of the peripheral wall 22 and the bottom plate 23, in the illustrated example, the outer peripheral portion of the bottom plate is a double cylindrical elastic raised cylinder 27 having an inverted U-shaped cross section, and as shown in FIG. The gap is provided so that the cross section is elastically deformed like a mountain. A seal ridge 28 is provided around the lower surface of the outward flange 26 and the outer surface of the peripheral wall 22 for hermetically pressing the upper end surface of the mouth and neck and the inner surface of the mouth and neck.

In the above configuration, as shown in FIG.
When the packing member 21 is mounted in the cap 11 and the cap is screwed into the mouth and neck 3 of the container body, the outward flange 26 comes into contact with the upper end surface of the mouth and neck 3 and the first packing member 21 is moved to the cap. The descent is stopped, and the lower end surface of the inner cylinder 15 contacts the upper surface of the peripheral wall 22 and descends along any one of the tapered surfaces, so that the peripheral wall 22 is expanded against its elasticity, and as shown in FIG. The outer surface is pressed against the upper inner surface of the mouth and neck 3 in an airtight manner. At this time, the middle cylinder 16 presses against the upper surface of the outward flange 26 and hermetically sandwiches the outward flange 26 between itself and the upper end surface of the mouth and neck.

In the above-mentioned sealed state, the outer surface of the peripheral wall 22 is pressed against the inner surface of the mouth and neck portion, and the inner surface of the peripheral wall is pressed against the outer surface of the inner cylinder 15, respectively. Since the inner diameter of the mouth and neck is larger than the diameter, and therefore the frictional resistance between the outer surface of the peripheral wall and the inner surface of the mouth and neck is greater than the frictional resistance between the inner surface of the peripheral wall 22 and the outer surface of the inner cylinder 15, the peripheral wall 22 is The inner cylinder 15 is pulled out from the inner surface of the peripheral wall as shown in FIG. 2 while being pressed against the inner surface, and then the peripheral wall 22 is reduced in diameter by elastic restoration and separated from the inner surface of the mouth and neck portion. The outer surface is fitted to the outer surface, and the outer periphery of the lower surface of the outward flange is engaged with the upper surface of the engaging ridge 17, and the cap is further screwed up to remove the cap from the container body with the first packing member fitted. Can be done.

FIGS. 3 and 4 show a second embodiment. In the second embodiment, the container body is the same as in the first embodiment, and the description thereof will be omitted by retaining the same reference numerals.

The cap 11 has an outer cylinder 14 and an inner cylinder 15
It hangs down from the outer circumference and the lower surface. The outer cylinder has, on the inner surface of the lower half, a female screw 12 to be screwed to the male screw of the mouth and neck, and has an engaging ridge 17 on the lower inner surface of the upper half of the outer cylinder. The outer diameter is smaller than the upper inner diameter of the neck. The inner cylinder is provided shorter than the outer cylinder. The lower end surface of the inner cylinder is an upper large-diameter tapered surface.

A second packing member 31 having elasticity is mounted in the cap. The second packing member,
A peripheral wall 32, which can be loosely inserted into the container body neck portion 4, is raised from the outer periphery of the bottom plate 33, the upper end of the peripheral wall is set to a large inner diameter, and the large inner diameter portion 34 is fitted to a lower outer surface of the inner cylinder 15, and An outward flange 35 is attached to the outer surface of the large-diameter portion, and the outward flange is slidably fitted into the upper half of the outer cylinder 14, and the outer peripheral portion thereof is engaged with an engaging ridge 17.
The upper surface is engaged.

As in the case of the first embodiment, seal ridges 36 are preferably provided around the outer surface of the peripheral wall 34 and the lower surface of the outward flange 35, respectively. An elastic raised cylinder 37 is provided, and the peripheral wall 32 is expanded against the elasticity by forcibly fitting the inner cylinder 15 as in the case of the first embodiment. The upper inner surface of the part 3 can be air-tightly pressed. The outward flange 35 is
The outer diameter of the flange is smaller than the inner diameter of the outer cylinder 14 and a plurality of elastic engaging elements 38 are projected at substantially equal intervals, and the tip circle of the engaging element is made larger than the inner diameter of the engaging ridge 17 so that the engaging ridge can be easily moved over.

In the case of the second embodiment, similarly to the case of the first embodiment, the inner cylinder 15 is made elastic as shown in FIG. 3 by screwing the cap with the second packing member onto the mouth and neck of the container body. The inner wall of the peripheral wall 32 is airtightly pressed against the inner surface of the mouth-and-neck portion 3 by outwardly expanding the diameter, and the outward flange 35 is a top wall between the upper end surface of the mouth-and-neck portion and the inner and outer cylinders. When the cap is unscrewed and the cap is unscrewed, the inner wall is first pressed against the inner surface of the mouth and neck due to the difference in frictional resistance due to the difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder. When the inner cylinder lower end moves to the upper end of the peripheral wall as shown in FIG. 4, the peripheral wall 32 is reduced in diameter by elastic contraction and detaches from the inner surface of the mouth and neck portion. Since the elastic engaging element 38 is engaged with the upper surface of the engaging ridge 17 and the large inner diameter portion 34 is fitted on the lower outer surface of the inner cylinder 15, the second packing is provided. Grayed member 31 remains attached to the cap, it is possible to remove the cap from the container body.

FIGS. 5 and 6 show a third embodiment. Also in the case of this embodiment, the container body is provided in the same manner as in the first and second embodiments, and accordingly, the description is omitted by attaching the same reference numerals.

The cap 11 may be provided in the same manner as in the second embodiment, but in the illustrated example, a short middle cylinder 16 is provided between the inner and outer cylinders 15 and 14.

The third packing member 41 has a peripheral wall 43 tapered downward and outward from the outer periphery of a bottom plate 42 having an outer diameter substantially equal to the outer diameter of the inner cylinder.
, And an outward flange 44 is attached to the lower end of the peripheral wall. The outward flange is fitted on the inner surface of the cap outer cylinder 14, and the lower outer edge is engaged with the upper surface of the engaging ridge 17 provided on the inner surface of the upper half of the outer cylinder. Seal projections are provided on the inner surface of the peripheral wall and the lower surface of the outward flange, respectively.

As shown in FIG. 5, the peripheral wall 43 and the bottom plate 42 of the third packing member 41 are reversibly elastically deformable against the elasticity by pressing down the cap inner cylinder 15, as shown in FIG. As described above, the cap is provided on the third packing member 41 so that the cap can be elastically restored by unscrewing. In the state shown in FIG. 5 described above, the inner surface of the peripheral wall 43 is airtightly pressed against the inner surface of the mouth and neck portion by reversing downward, the outer surface is airtightly pressed against the outer surface of the inner cylinder 15, and the outer flange 44 Is hermetically sandwiched between the upper end surface of the mouth and neck portion and the lower surface of the top wall portion between the inner and outer cylinders, in the illustrated example, the lower surface of the middle cylinder 16.

In each of the embodiments described above, the container body and the cap are each formed of a synthetic resin material, and each packing member is formed of a highly elastic, for example, rubber-like member.

[0023]

According to the present invention, the packing member is mounted on the cap, and in the case of the first embodiment, the inner elastic cylinder 24 of the first packing member 21 is replaced with the cap inner cylinder 15. Just by fitting the outward flange 26 into the upper half of the cap outer cylinder 14 and engaging with the engaging ridge 17 provided on the lower inner surface of the upper half of the outer cylinder, In the case of claim 2, the large-diameter portion 34 of the second packing member 31 is fitted to the lower outer surface of the inner cylinder 15, the outward flange 26 is fitted between the inner and outer cylinders, and the outer peripheral portion of the outward flange is removed. The outer flange 14 of the third packing member 41 is formed around the lower inner surface of the upper half of the outer cylinder 14 only by engaging with the engaging ridge 17 provided on the lower inner surface of the upper half of the cylinder. By simply engaging with the upper surface of the provided engaging ridge 17, they can be mounted respectively, and the mounting is easy. .

Further, when the cap with each packing member is screwed into the mouth and neck of the container body, in the case of the first and second aspects, the outer surface of the peripheral wall of each packing member is directed to the inner surface of the mouth and neck of the container body. In addition, since the lower surface of the outward flange 26 is air-tightly pressed against the upper surface of the mouth and neck, respectively,
Are inverted and the inner surface and the inner surface of the mouth and neck are pressed against the upper surface of the mouth and neck in an airtight manner, and the container body is provided at the inner surface of the mouth and neck 3 and the upper surface of the mouth and neck respectively. The container is hermetically sealed, so that the container can be securely sealed.

The packing member described in each claim is mounted in the cap when the cap is unscrewed, and the packing member in the case of claims 1 and 2 is screwed into the mouth and neck of the container body. The inner cylinder 15 enters the peripheral wall 22 to expand the diameter of the peripheral wall and press the outer surface of the peripheral wall against the inner surface of the mouth and neck, and when the cap is unscrewed, the inner cylinder is pulled out from the inside of the peripheral wall. In the case of claim 3, the bottom plate 42 and the peripheral wall 43 are pressed in an inverted manner by the inner cylinder of the cap so as to be elastically resilient, and the inner surface of the peripheral wall is pressed against the inner surface of the mouth and neck, and When the cap is unscrewed, since the bottom plate and the peripheral wall are elastically restored by the rise of the inner cylinder and the peripheral wall 43 is separated from the inner surface of the mouth and neck, when the cap 11 is removed from the mouth and neck, each packing member is in an elastically restored state. Will be left behind, Elastic fatigue ring member is reduced, it is possible to enhance the durability of each packing member.

[Brief description of the drawings]

FIG. 1 is a half sectional view of the container of the present invention.

FIG. 2 is a half sectional view showing the container of FIG. 1 with a cap loosened.

FIG. 3 is a half sectional view of a container, showing a different embodiment.

4 is a half sectional view showing the container of FIG. 3 with the cap loosened.

FIG. 5 is a half sectional view of a container, showing another embodiment.

FIG. 6 is a half sectional view showing the container with the cap loosened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container body 11 ... Cap 15 ... Inner cylinder 21 ... First packing member 22 ... Peripheral wall 26 ... Outward flange 31 ... Second packing member 41 ... Third packing member

Claims (3)

[Claims] 1. A container body 1 having a male screw 4 attached to a lower half outer surface of a mouth and neck portion 3 rising from an upper end of a body portion 2, and a female screw 12 to be screwed to the male screw. Along with being provided on the lower half inner surface of the cylinder 14, an inner cylinder 15 having an outer diameter smaller than the upper inner diameter of the mouth and neck, shorter than the inner cylinder, and having a larger inner diameter than the upper inner diameter of the mouth and neck and a smaller outer diameter than the outer diameter A cap 11 having a small outer diameter and a middle cylinder 16 which respectively hang down from the top wall 13, and a lower inner surface of an upper half of the outer cylinder 14 having an engaging ridge 17 provided therearound, and an elastic member mounted in the cap The first packing member 21 is configured to stand up from the outer periphery of the bottom plate 23 at the outer periphery of a bottom plate 23 which can be loosely inserted into the mouth and neck and can be expanded in diameter against elasticity. The inner elastic cylinder 24 is erected by fitting from the outer periphery of the upper end of the peripheral wall to the lower outer surface of the inner cylinder 15. The elastic cylinder 25 is hung down in a folded manner, and an outward flange 26 attached to the lower end of the outer elastic cylinder is fitted into the outer cylinder 14 to engage with the upper surface of the engaging ridge 17, and the inner diameter of the peripheral wall 22. Is smaller than the outer diameter of the inner cylinder 15 and the wall thickness of the peripheral wall is larger than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder, and at least one of the upper end surface of the peripheral wall and the lower end surface of the inner cylinder is When the cap 11 with the first packing member is screwed into the mouth and neck of the container body, the inner cylinder 15 is expanded against the elasticity and fits into the peripheral wall 22 when the upper large diameter tapered surface is set. At the same time, the outer surface of the peripheral wall 22 is air-tightly pressed against the inner surface of the mouth-neck portion 3, and at this time, the lower end surface of the middle cylinder 16 can air-tightly sandwich the outward flange 26 between the upper surface of the mouth-neck portion 3. When the cap is unscrewed, the peripheral wall 22 is formed so that the diameter thereof can be reduced by elastic recovery by pulling out the inner cylinder 15. 2. A container body 1 having a male screw 4 attached to a lower half outer surface of a mouth-neck portion 3 rising from an upper end of a body portion 2, an inner cylinder 15 having an outer diameter smaller than an upper inner diameter of the mouth-neck portion 3, An outer cylinder 14 having a female screw 12 screwed to the male screw on the lower half inner surface.
And a cap 11, each of which extends vertically from the top wall 13, and which has an engaging ridge 17 provided on the lower inner surface of the upper half of the outer cylinder, and which can be freely inserted into the mouth and neck and resists elasticity. The expandable peripheral wall 32 is erected from the outer periphery of the bottom plate 33, the upper end of the peripheral wall is set to a large inner diameter, and the large inner diameter part 34 is fitted to the lower outer surface of the inner cylinder 15 and attached to the outer surface of the large inner diameter part. Outward flange 35
And a second packing member 31 rich in elasticity, which is slidably fitted into the upper half portion of the outer cylinder and whose outer peripheral portion is engaged with the upper surface of the engaging ridge 17. While the diameter is smaller than the outer diameter, the wall thickness of the peripheral wall is larger than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder 15, and at least one of the bottom surface of the large inner diameter part and the lower end face of the inner cylinder 15 Is a tapered surface with an upper large diameter, and when the cap with the second packing member is screwed into the mouth and neck of the container body, the inner cylinder 15 is expanded against the elasticity and fitted into the peripheral wall 32. At the same time, the outer surface of the peripheral wall 32 is airtightly pressed against the inner surface of the mouth-neck portion 3, and at this time, the top wall portion between the inner and outer cylinders can airtightly clamp the outward flange 35 between the upper end surface of the mouth-neck portion 3. In addition, when the cap is unscrewed, the peripheral wall 32 is formed so that the diameter thereof can be reduced by elastic recovery by extracting the inner cylinder 15. 3. A container body 1 having a male screw 4 attached to a lower half outer surface of a mouth-neck portion 3 rising from an upper end of a body portion 2, an inner cylinder 15 having an outer diameter smaller than an upper inner diameter of the mouth-neck portion, An outer cylinder 14 having a female screw 12 on the lower half inner surface to be screwed to the male screw is vertically provided from the top wall 13, and a cap 11 having an engaging ridge 17 provided on the lower inner surface of the upper half of the outer cylinder 14 is provided. From the outer periphery of the bottom plate 42 to the outer side, the peripheral wall which is thicker than the diameter difference between the inner diameter of the mouth and neck and the outer diameter of the inner cylinder and which can be expanded against elasticity.
43, the outward flange 44 attached to the lower end of the peripheral wall is fitted into the outer cylinder, and is engaged with the upper surface of the engaging ridge 17, so that it is elastically attached to the cap. The inner cylinder 15 elastically deforms the bottom plate 42 and the peripheral wall 43 in a reverse manner by screwing the cap with the third packing member to the mouth and neck of the container body. The peripheral wall 43 is between the inner cylinder 15 and the upper part of the mouth and neck, and the outward flange 44 is between the upper end face of the mouth and neck and the top wall between the inner and outer cylinders, each of which can be airtightly sandwiched, Further, the third packing member 41 is formed so as to be elastically returned to its original shape by unscrewing the cap.