JPH0426345Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a closure for a container opening, such as a stopper or a cap.

[Conventional technology]

2. Description of the Related Art Conventionally, as a closure for a container opening which is screwed onto the opening of a container containing beer, carbonated beverages, etc. and subject to internal pressure, a structure shown in FIG. 4 is known.

This is done by providing a flange 4 on the inside of the upper edge of a synthetic resin threaded tube 3 that is screwed into the container opening 1, and fitting a metal disk 10 into the threaded tube 3 inside this flange 4. When the screw tube 3 is screwed together, an annular packing 11 made of rubber or the like interposed between the peripheral edge of the metal disc 10 and the container opening 1 is fitted into the screw tube 3.

[Problem that the invention attempts to solve]

However, such a structure requires an annular packing 11 made of rubber or the like in addition to the threaded cylinder 3 made of synthetic resin and the metal disk 10, and there are three types of parts made of different materials. There are two points: procuring three types, and assembly requires three steps: forming a threaded cylinder 3 made of synthetic resin, fitting a metal disc 10, and finally fitting an annular packing. Therefore, there is a problem in that the manufacturing cost increases accordingly.

The present invention was devised in view of these points, and the technical objective is to reduce the number of parts as much as possible and provide an inexpensive closure for a container opening.

[Means for solving problems]

In order to solve the above technical problem, the present invention takes the following technical measures.

That is, an annular seal body 5 made of synthetic resin that fits into the container mouth 1 is vertically provided on the flange 4 that comes into contact with the edge of the container mouth 1 .

A metal disc 7 formed in a circular shape with an annular side wall 6 standing upright around the periphery is fitted into the annular seal body 5, and the annular seal body 5 is held by the annular side wall 6 of the annular seal body 5. This metal disk 7 may be fitted into the annular seal body 5 with the annular side wall 6 facing upward, or may be fitted into the annular seal body 5 with the annular side wall 6 facing downward.

Further, a closing plate 8 is provided along at least one surface of the metal disk 7.

The flange 4, annular seal body 5, and closure plate 8 are integrally formed of synthetic resin and serve as a closure for the mouth of the container.

The closure for the container mouth formed in this way can be formed as a cap provided with the threaded tube 3, or as a stopper that fits only inside the container mouth 1.

[Effect]

The flange 4, the annular seal body 5, and the closing plate 8 can be integrally formed as one part by injection molding, and can be manufactured by simply fitting the metal disk 7 thereto.

By fitting the metal disc 7 into the annular seal body 5, the annular seal body 5 is held by the annular side wall 6 of the metal disc 7, so that the internal pressure of the container containing carbonated drinks, etc. Even if it is applied to the seal body 5, the space between the annular seal body 5 and the inner wall surface of the container opening 1 is not pushed apart, and a high sealing force is maintained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

It is screwed onto the container opening 1 and has vertical ribs 2 around it.
A flange 4 is provided on the inner side of the upper end edge of the screw tube 3 provided with a plurality of screws, and an annular seal body 5 that fits into the container mouth 1 is vertically provided from the inside of the flange 4.
Inside this annular seal body 5 is a circular annular side wall 6 surrounding the annular side wall 6.
A metal disc 7 formed by standing up is fitted.

This metal disk 7 is fitted into the annular seal body 5 with the annular side wall 6 facing downward, and a closing plate 8 having a shape substantially similar to this metal disk 7 is attached to the annular seal body 5 along the lower surface side. They are integrally connected.

The screw tube 3, flange 4, annular seal body 5, and closing plate 8 are all integrally formed of the same synthetic resin by injection molding.

Next, another embodiment will be described based on FIG.

In this embodiment, the flange 4 extends further inward than the one in FIG. It is integrally connected to the flange 4 along the extending side of the disk 7.

When formed in this way, the annular side wall 6 of the metal disc 7 faces upward, and the internal pressure of the container applied to the metal disc 7 becomes a force that presses the annular seal body 5 via the annular side wall 6, so that the annular seal The body 5 is pressed against the inner wall surface of the container opening 1, thereby increasing its sealing force.
Further, since the upper end of the annular side wall 6 of the metal disk 7 is supported by the flange 4, the metal disk 7 will not slip out upward.

In the above embodiment, the screw tube 3 is provided to form a cap that is screwed onto the container opening 1.
As shown in FIG. 3, it is also possible to omit the screw tube 3 and form a stopper that simply fits into the container opening 1.

However, if the screw tube 3 is omitted, there will be no vertical tightening force against the container opening 1, so another cap 9 may be used in combination.

[Effect of idea]

According to the present invention, the flange 4 and the annular seal body 5
and the closing plate 8 can be integrally formed as one part by injection molding, and can be manufactured by simply fitting the metal disc 7 thereto, so only two types of materials are required, the number of parts is small, and assembly is easy. Manufacturing costs are low.

By fitting the metal disc 7 into the annular seal body 5, the annular seal body 5 is held by the annular side wall 6 of the metal disc 7, so that the internal pressure of the container containing carbonated drinks, etc. Even if it is applied to the seal body 5, the space between the annular seal body 5 and the inner wall surface of the container mouth part 1 is not pushed apart, and a high sealing force is maintained, so that the carbonated beverage or the like in the container does not leak out.

[Brief explanation of the drawing]

Fig. 1 is a half-cut longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a half-cut longitudinal sectional view showing another embodiment, Fig. 3 is a half-cut longitudinal sectional view showing another embodiment, and Fig. 4. is a half-sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Container mouth part, 4... Flange, 5... Annular seal body, 6... Annular side wall, 7... Metal disc,
8...Occlusion plate.

Claims (1)

[Scope of utility model registration request] An annular seal body 5 made of synthetic resin that fits inside the container mouth 1 onto a flange 4 that abuts the edge of the container mouth 1
is vertically provided, and a metal disk 7 formed by standing up a circular side wall 6 around the annular seal body 5 is fitted into the annular seal body 5, and a closing plate 8 is fitted along at least one surface of the metal disk 7. A closure device for a container opening in which the flange 4, the annular seal body 5, and the closure plate 8 are integrally formed of synthetic resin.