JP3240587B2 - Inside cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner plug used by being attached to a cap, and more particularly to an improvement in a sealing structure of the inner plug.
It is about.

[0002]

2. Description of the Related Art Some caps are provided with an inner plug in advance to achieve a seal when the cap is mounted on a container such as a bottle. As such an inner plug, there is also one formed integrally with a flat packing or a cap, but in particular, when the contents are easily affected by moisture, a desiccant is put in the inner plug. There is something.

FIG . 8 is a half sectional view showing a used state of a conventional cap in which a desiccant is placed in an inner plug. In the figure, 1
Is a cap body, 2 is an inner stopper, 3 is a desiccant, and the desiccant 3 is put in the inner stopper 2 and attached to the cap body 1. The inner plug 2 has a shape having a projection 4 inserted into the container 20 and a flange portion 5 that is in pressure contact with the tip end surface 21 of the container 20. The flange portion 5 further ensures sealing when the cap is attached. One or a plurality of circular ribs 6 are provided on the contact surface with the container 20. Further, the desiccant 3 is put in the protrusion 4, and a ventilation hole 7 is provided in the protrusion 4. The cap is attached to the container 20 by screwing a female screw 8 provided on the cap body 1 and a male screw 9 provided at the mouth of the container 20.

[0004] The conventional desiccant-containing cap is constructed as described above. When the cap is attached to the container 20, the flange portion 5 of the inner plug 2 is connected to the cap body 1 and the distal end surface 21 of the container 20.
And presses the rib portion 6, thereby preventing the invasion of moisture. Further, even if moisture invades, the desiccant 3 adsorbs moisture, so that air pollution of the contents can be prevented.

[0005]

However, the seal structure of the conventional inner plug has a flat flange portion 5 and a cap body 1.
And the front end face 21 of the container 20, there is a possibility that moisture may enter from two directions a and b indicated by arrows. First, since the back surface of the flange portion 5 is in a surface contact state, if the contact pressure decreases even a little, moisture easily enters from the a direction. But a
Since the moisture from the direction is adsorbed by the desiccant 3 in the inner plug 2, the influence on the contents is relatively small. Next, a circular rib portion 6 is provided on the front surface of the flange portion 5.
Since the circular rib portion 6 is in line contact with the front end surface 21 of the container 20, it can be said that moisture intrusion from the direction b is smaller than that from the direction a, but it cannot be eliminated.
In addition, there is a gap between the projection 4 and the inner surface of the tip of the container 20, and when moisture enters from the direction b, the desiccant 3
Can not adsorb moisture, causing air pollution of the contents.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides an inner plug of a cap which has a simple structure and can prevent moisture from entering both directions a and b. The purpose is to:

In order to achieve the above object, the inner plug of the cap according to the present invention comprises a projection inserted into a container and a projection pinched from both sides of a back surface of the cap body and a front end surface of the container. A flange portion extending outward from the upper end of the cap, wherein in the inner plug of the cap mounted in the cap body, the flange portion is in line contact with the cap body on the back side thereof. And two circular ribs formed apart from each other so as to form a double seal portion, and a curved cross-section protruding on the front surface side toward the protruding portion and having the above-mentioned two circular rib portions as base ends. An elastic circular bent portion is formed, and the top side of the circular bent portion is formed at a position in contact with the front end surface of the container to prevent moisture from entering the protrusion and the container, respectively. Features. Further, when the desiccant is put in the projection in advance, a plurality of ventilation holes are provided in a flat wall forming the projection, and when the desiccant is not put, the projection is passed through. It is characterized by comprising a closed wall without pores.

[0008]

In the present inner plug, since the circular bent portion corresponding to the flange portion has a function such as a disc spring or a spring washer, the cap body does not loosen and the sealing action on both surfaces of the circular bent portion is always maintained.

[0009]

(Embodiment 1) FIG. 1 is a half sectional view showing Embodiment 1 of the present invention, FIG. 2 is a top view, and FIG. 3 is an enlarged view of a portion P in FIG. FIG. 4 is a half sectional view showing a state before the inner plug of the present embodiment is pressurized.
FIG. 5 is a half sectional view showing a state at the time of pressurization.

The inner plug 10 has a portion corresponding to the circular flange portion as a circular bent portion 11 having a curved cross-sectional shape.
Two circular ribs 14 and 15 are provided on the back of the circular flexure 11.
Are provided concentrically. In the figure, 12 is a protrusion,
The desiccant 13 is put in it. Reference numeral 16 denotes a plurality of protrusions provided on the outer peripheral end of the circular bending portion 11, and reference numeral 17 denotes a ventilation hole provided in the protrusion 12. The inner plug 10 is made of plastic, synthetic rubber or the like by integral molding.

The inner plug 10 constructed as described above is mounted in the cap body 1 with the desiccant 13 inserted in the projection 12. Thereafter, the cap body 1 is placed in the container 20.
And screw it on.

[0012] By screwing the cap body 1, the inner plug 1
0 changes from the state of FIG. 4 to the state of FIG.
That is, the circular bending portion 11 has a function such as a disc spring or a spring washer. Therefore, first, as shown in FIG. 5, the circular bending portion 11 is pressed by the distal end surface 21 of the container 20. Since the circular bent portion 11 is supported in line contact with the support surface 1 a of the cap body 1 by the two circular rib portions 14 and 15, the central portion of the circular bent portion 11 is pressed by the distal end surface 21 of the container 20. Then, the circular rib portions 14, 1
5 on the supporting surface 1a of the cap body 1
Seal portions A and B formed of the circular pressure tangent lines are formed.
Therefore, the seal portions A and B composed of these two circular pressure contact lines
Thereby, it is possible to reliably prevent moisture from intruding from the direction a, which tends to intrude along the support surface 1a of the cap body 1. In addition, the circular ribs 14 and 15 tend to expand inward and outward, respectively, by the pressure of the circular flexure 11, so that they fit well with the support surface 1 a of the cap body 1, so that the sealing performance is further improved.

At the same time, the surface side of the circular bending portion 11
The seal portion C in a surface contact state is formed by pressure contact with the front end surface 21 of the container 20, but since the circular bending portion 11 has a spring property, the seal portion C is always held at a constant pressure contact force.
Therefore, since the cap body 1 does not loosen, even if there is a gap between the protrusion 12 and the inner peripheral surface of the tip of the container 20, a, b are formed by these seal portions A, B, C. It is possible to prevent moisture from entering from both directions at the same time.

(Embodiment 2) Next, FIG. 6 is a half sectional view showing Embodiment 2 of the present invention, and FIG.
It is a top view. In the case of contents in which there is little concern about air contamination even without the desiccant 3, a wall having the protrusion 12 closed, that is, a wall having no vent hole can be used.
The present embodiment shows the structure of such an inner plug,
12 is composed of a closed wall 12a having no vent hole.
is there. Other configurations are the same as those of the first embodiment. Therefore,
The inner plug according to the present embodiment does not include a desiccant in the protrusion 12.
It is used as it is attached to the cap body.

[0015]

As described above, the inner plug according to the present invention has a projection and a flange extending outward from the upper end of the projection, and the flange is provided on the back side of the cap body. 2 formed apart to form a double seal portion in a line contact state.
Since the circular rib portion of the strip and the front side thereof are formed with an elastic circular bending portion having a curved cross section with the above-mentioned two circular rib portions as base ends, when the inner plug is attached to the container, The circular bending portion is pressed against the front end surface of the container, and the two circular rib portions formed on the back side are pressed against the rear surface side of the cap body, and two circular rib portions are used by the two circular rib portions. Seal portions A and B made of circular pressure tangent lines are formed to reliably prevent moisture from intruding in the a direction, which tends to intrude along the support surface of the cap body, while the circular bending portion has its top side and Due to the contact with the front end surface of the container, it is pressurized and deformed to be in a surface contact state, and is pressed by its elastic repulsion to form the sealing portion C.
Is formed, and there is an effect that it is possible to reliably prevent moisture from intruding from the direction b, which tends to enter the container from the gap formed between the container and the projection. In addition, the sealing portion is held with a constant pressing force by the spring force of the circular bending portion, so that the cap body can be prevented from being loosened.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first embodiment of the present invention.

FIG. 2 is a top view of the first embodiment.

FIG. 3 is an enlarged sectional view of a portion E in FIG. 1;

FIG. 4 is a half sectional view showing a state before mounting the container in the first embodiment.

FIG. 5 is a half sectional view showing a state after mounting the container in the first embodiment.

FIG. 6 is a half sectional view showing Embodiment 2 of the present invention.

FIG. 7 FIG. 9 is a top view of the second embodiment.

FIG. 8 is a half sectional view showing a state of use of a conventional inner plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap main body 3 Desiccant 5 Flange part 10 Inner plug 11 Circular bending part 12 Projection part 14, 15 Circular rib part 16 Protrusion 20 Container 21 Container tip end surface

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-50-1556 (JP, A) JP-A-1-73160 (JP, U) JP-A 62-45250 (JP, U) JP-A 61- 161261 (JP, U) Jiko 35-783 (JP, Y1) Jiko 40-7759 (JP, Y1) Jiko 36-28569 (JP, Y1) Joji 47-2679 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 51/30 B65D 53/04

Claims (3)

(57) [Claims] 1. A projection inserted into a container, and a flange extending outward from an upper end of the projection pressed from both sides of a back surface of a cap body and a front end surface of the container. In the inner plug of the cap mounted in the cap main body, the flange portion is formed on the back side so as to form a double seal portion in line contact with the cap main body. A circular rib portion formed on the front surface of the circular rib portion and a resilient circular bent portion having a curved cross section having the base of the two circular rib portions as a base end; The inner plug of a cap, wherein a top side of the portion is formed at a position where the top portion comes into contact with a front end surface of the container. 2. The inner plug of a cap according to claim 1, wherein said projection has a ventilation hole on a wall thereof and a desiccant is previously contained therein. 3. The plug according to claim 1, wherein the projection is formed by a closed wall.