JPH0627589U - Sealing structure of container mouth - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to provide a container mouth sealing structure in which airtightness can be easily maintained by screwing a cap. [Structure] A conical surface 3 having a wide opening upward is provided on the inner circumference of the container mouth 2, a male screw 4 is formed on the outer circumference of the container mouth, and an outer peripheral wall 7 of a cap 5 fitted to the container mouth is formed. A female screw 17 that is screwed into the male screw of the container opening is provided, and an inner plug 8 that strongly presses against the inner surface of the conical surface is hung vertically under the cap top wall 6 as the cap advances.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a sealing structure for a liquid container opening and a cap.

[0002]

[Prior art]

 As a conventional container sealing structure, one in which a packing P is inserted into a cap C as shown in FIG. 7A, one in which an inner plug E is inserted into a container opening D as shown in FIG. 7B, As shown in FIG. 8 (A), a cap C is integrally provided with an inner plug e, and a seal S 1 is fitted between the inner plug and the outer peripheral wall c. (For example, Japanese Utility Model Laid-Open No. 61-183846) Also, as shown in FIG. 8 (B), it is known that the outer circumference of the container mouth portion D is tapered, a male screw d is provided on the outer circumference, and the cap C is screwed to seal. ing.

In a container in which a cap is screwed onto the outer circumference of a mouth, a cap is provided with a resilient piece that is in close contact with the inner circumference of the mouth, and the tightness of the resilient piece maintains airtightness. It (For example, in Japanese Utility Model Laid-Open No. 53-66452) In a container in which a lid is fitted to the mouth, an elastic tongue is projected on the inner periphery of the container mouth, and an elastic tongue of the container mouth is provided on the outer periphery of the lid. It is also known that a wedge piece which is in close contact with the elastic tongue and the wedge piece is provided to maintain airtightness. (For example, Japanese Utility Model Publication No. 61-164146)

[0004]

[Problems to be solved by the device]

 With a sealed structure in which a packing or seal is inserted inside the cap to keep the container mouth airtight, it takes time and effort to insert the packing or seal, and even if the packing comes off or is aged, it can be easily found. There is a problem that can not be done. Further, in the sealed structure in which the inner plug is inserted into the container mouth to keep the container mouth airtight, there is a problem that the inner plug may be forgotten or lost.

In a container in which an elastic tongue is projected on the inner periphery of the container mouth and the lid wedge is in close contact with this, it is difficult to form the elastic tongue evenly, and the wedge tongue is evenly formed. There was a problem that was not close to. The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a sealing structure capable of easily maintaining airtightness by screwing a cap. It is in.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the container mouth sealing structure in the present invention is provided with a conical surface with a wide opening upward on the inner circumference of the mouth, and a male screw is formed on the outer circumference of the mouth to make the container mouth open. On the outer peripheral wall of the cap that fits in, a female screw that is screwed into the male screw of the container opening is provided, and an inner plug that strongly presses against the inner surface of the conical surface is hung vertically under the cap top wall as the cap advances. It was done.

[0007]

【Example】

 Hereinafter, the sealing structure of the container mouth of the present invention will be described with reference to FIGS. 1 to 3 of the embodiment. In the sealing structure, a conical surface 3 having a wide upward opening is provided on the inner circumference of the container mouth 2, and the container mouth 2 A male screw 4 is formed on the outer circumference of the cap 5, a female screw 17 for screwing with the male screw 4 of the container mouth 2 is provided on the outer peripheral wall 7 of the cap 5, and a conical weight is screwed under the cap top wall 6 according to the screwing of the cap 5. An inner plug 8 that strongly presses against the inner surface of the surface 3 is provided vertically.

The container mouth portion 2 is integrally formed on the upper portion of the container body 1, a conical surface 3 is formed on the inner circumference of the mouth portion 2 so as to widen upward, and a male screw 4 is formed on the outer circumference of the mouth portion 2. The conical surface 3 is formed with an inclination angle θ of 1 to 45 degrees. In the cap 5, an inner plug 8 is provided at the center of the top wall 6 and an outer peripheral wall 7 is hung at the outer edge, and a female screw 17 to be screwed into the male screw 4 of the container mouth 2 is formed on the inner periphery of the outer peripheral wall 7. .

The outer diameter R of the cap inner plug 8 is made slightly larger than the minimum inner diameter r of the mouth conical surface 3, and the tip 8a of the inner plug 8 is formed into a hemispherical surface, or is formed from the outer periphery to the top surface. The corners that reach it are formed into curved surfaces. The container body 1 and the cap 5 are made of synthetic resin such as polyethylene or polypropylene.

The cap 5 of FIG. 4 (A) is formed in the inner plug 8 with a hollow hole 18 that opens downward from the inside, and the cap 5 of FIG. 4 (B) is formed in the inner plug 8 and upward from the inside. By forming the hollow hole 18 that opens, the elasticity of the inner plug 8 is improved by the formation of the middle hole 18, and the close contact between the inner plug 8 and the mouth conical surface 3 is further improved. It also saves money. The cap 5 in FIG. 5 is formed by forming the inner plug 8 into a spherical shape.

Since the sealing structure of the present invention is the above-mentioned structure, when the cap 5 is screwed into the container mouth portion 2, the tip 8a of the inner plug 8 follows the conical surface 3 of the mouth portion 2 as the cap 5 is screwed. The inner plug tip portion 8a contacts the conical surface 3 in due course. After the inner plug tip portion 8a is in contact with the mouth conical surface 3, the cap 5 is further strongly screwed, so that the inner plug 8 is axially inserted as shown in FIG. At the same time, the container mouth portion 2 is pressed outward like a wedge to deepen the screw engagement between the container mouth portion 2 and the cap outer peripheral wall 7.

[0012]

[Effect of device]

 Since the sealing structure of the mouth portion of the container of the present invention is configured as described above, it has the following effects. The inner surface of the container mouth is provided with a conical surface that widely opens upwards, and the cap is integrally molded with the inner plug that is inscribed in the conical surface of the container mouth. It strongly and compulsorily contacts the conical surface of the mouth. As a result, the sealing of the container mouth is dramatically improved.

When the inner plug strongly comes into close contact with the conical surface of the inner circumference of the container opening due to the screwing of the cap, the container opening is pressed against the outer peripheral wall of the cap like a wedge, so that the container opening and the cap are closed. The outer peripheral wall is also screwed tightly. The hermetically sealed structure of the present invention is optimal as a hermetically sealed structure for the mouth of a container in blow molding, which has variations in dimensional accuracy, or as a hermetically sealed structure for the container of a liquid or gas that easily leaks.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a sealing structure of a container mouth of the present invention.

FIG. 2 is a vertical sectional view of a cap.

FIG. 3 is a vertical cross-sectional view of a main portion of a container mouth portion.

FIG. 4 is a vertical cross-sectional view showing a structural example of the caps (A) and (B).

FIG. 5 is a vertical cross-sectional view of a cap showing a structural example of an inner plug.

FIG. 6 is a longitudinal sectional view of an essential part showing an operating state of the sealing structure of the present invention.

7 (A) and (B) are longitudinal cross-sectional views of essential parts showing a conventional sealing structure.

8 (A) and 8 (B) are longitudinal cross-sectional views of essential parts showing a conventional sealing structure.

[Explanation of symbols]

 1 container body 2, D container mouth part 3 conical surface 4, d male screw 5, C cap 6 cap top wall 7, c outer peripheral wall 8, e inner plug 17, d female screw, 18 middle hole E inner plug body P Packing S Seal θ Inclination angle of conical surface R Outer diameter of inner plug, r Minimum inner diameter of conical surface

Claims (1)

[Scope of utility model registration request] 1. A container mouth (2) is provided with a conical surface (3) having a wide opening upward and an external thread (4) is formed on the outer circumference of the container mouth to fit the container mouth. On the outer peripheral wall (7) of the cap (5), the female screw (1
7) is provided, and an inner plug (8) is hung vertically below the cap top wall (6) to strongly press against the inner surface of the conical surface as the cap is threaded.