JPH0356989B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a screw cap for sealing the mouth of a screw-top bottle.

[Conventional technology]

In general, screw caps for screw cap bottles include a disc-shaped head 21 made of a hard plastic molded product, and a cylindrical body extending downward from the periphery of the head 21, as shown in FIG. 22, a female thread 25 is carved on the inner circumferential surface of the body 22 to be screwed into the male thread 24 of the bottle mouth 23, and a disk valve packing 26 made of cork, paperboard, etc. is provided inside the head 21. It was inserted and screwed onto the bottle mouth 23.

However, in this screw cap, the packing 26
A gap was easily formed between the container and the bottle opening 23, and it was impossible to distinguish between an opened screw cap and an unopened screw cap.

On the other hand, as shown in FIG. 6, screw caps that can be used to distinguish between open and unopened bottles include an inner cap 32 made of an elastic material such as rubber that is placed over a bottle mouth 31 that has a finished part for a crown; Some types include a hard plastic outer cover 33 that is placed over an inner cover 32. This product has a female threaded part 34 on the upper part of the inner circumferential surface of the outer lid 33, and a bead part 35 on the lower edge of the inner circumferential surface is engaged with a step part 36 of the bottle mouth, and a bead part 35 formed on the lower part of the outer circumferential surface. The lower edge 33a of the hard outer lid 33 was threaded off from the cut 37 to open the lid.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional screw cap in which the lower edge of the outer cover is threaded requires considerable force to thread the lower edge of the highly rigid outer cover, so there is a problem in that it is difficult to open. Further, a problem common to the two types of screw caps mentioned above is that the inner cap tends to come off from the outer cap after opening, and resealing is not reliable.

The present invention solves the above-mentioned problems and provides a screw cap with a threaded section for distinguishing whether the bottle has been opened or not, which can seal the mouth of the bottle with good sealing performance, can be easily opened, and can be re-sealed. The challenge is to ensure that the seal is sealed.

[Means for solving problems]

In order to solve the above-mentioned problems, in this invention, a downward-facing barrel is connected to the periphery of the head, and the inner peripheral surface of this barrel has an inner diameter slightly larger than the outer diameter of the male thread of the bottle mouth. A hard outer cover with a female thread engraved thereon, and a cylindrical part with a wall thickness that is calculated by adding the gap size and tightening allowance between the male and female threads to the periphery of the circular top that fits inside this outer cover. In a screw cap for a screw cap bottle that is combined with a continuous hard inner cap, a retaining ring that fits into the bottle mouth is connected to the lower cylindrical edge of the hard inner cap via a cut, and the outer cap is connected to the outer cap. A configuration was adopted in which a locking groove extending in the circumferential direction was provided on the inner corner edge of the head.

[Effect]

The screw cap according to the invention is constructed as described above, and when the retaining ring of the inner cap of the bottle spout is fitted and the outer cap is screwed in from above, the outer cap is attached to the hard inner cap by the size of the tightening margin. By compressing the lid, the inner lid fills the gap between the male thread of the bottle mouth and the female thread of the outer lid, thus sealing the bottle mouth. At this time, the circular top of the inner lid is press-fitted into the locking groove at the inner corner of the head of the outer lid to form a flange, and the two lids are integrated. Therefore, when the bottle is opened, the inner cover moves together with the outer cover in the direction of the axis of rotation, and the lower edge of the hard inner cover that fits into the bottle mouth is easily broken from the cut. Furthermore, the inner lid, which is held integrally inside the outer lid, will not come off during resealing.

〔Example〕

Embodiments of this invention will be described below based on the drawings.

The first embodiment shown in each figure from FIG. 1 to FIG.
A downward cylindrical body 2 is attached to the periphery of a flat circular head 1.
are integrally connected, and a female thread 3 with an inner diameter slightly larger than the outer diameter of the male thread 24 of the corresponding bottle mouth 23 is engraved on the inner circumferential surface of the body 2. It consists of a lid 4, a hard inner lid 7 made of a high-pressure polyethylene molded product, which has a circular top part 5 fitted inside the outer lid 4, and a cylindrical part 6 of a predetermined thickness facing downward on the periphery thereof. It is something.

An annular locking groove 8 (see FIG. 3) extending in the circumferential direction is formed in the inner circumferential corner of the head 1 in the outer cover 4, so that the outer circumferential edge of the top of the inner cover 7 is inserted into the groove when tightening. I'm trying to press fit it in. Furthermore, a plurality of anti-slip protrusions 9 are formed on the outer circumferential surface of the trunk 2.
For example, when the wall thickness of the cylindrical portion 6 is 0.4 mm, the slight difference in size between the inner diameter of the female thread 3 of the outer peripheral surface of the body portion 2 and the outer diameter of the male thread 24 is half of that. The tightening margin is 0.2 mm, and the inner diameter (diameter) of the female thread 3 is set to be 0.4 mm larger than the outer diameter (diameter) of the male thread 24. With this setting, when the inner cover 7, which is hard and plastic at room temperature, is tightened by the outer cover 4, it deforms into a mountain shape along the threaded surfaces, and fills the gap between the threaded surfaces. Ru.

The hard inner lid 7 has a cylindrical portion 6 that is slightly longer than the body 2 of the outer lid 4, and is fitted onto the bottle neck 27 (see Fig. 3) through a cut 10 along the entire lower edge of the cylindrical portion 6. A fastening ring 11 with a wall thickness as large as possible is provided in succession. Also,
On the inner surface of the top part 5, a ring-shaped plug 12 that fits inside the bottle spout 23 projects downward to improve alignment with the bottle spout 23. The fastening ring 11 is formed with a plurality of shallow cuts 13 (see FIG. 2) in the vertical direction to facilitate fitting into the bottle neck 27.

To use the screw cap described above, either the inner cap 7 and the outer cap 4 are screwed onto the bottle spout 23 at the same time, or the inner cap 7 is first fitted onto the bottle spout 23 and then removed. Screw on the lid 4. At this time, attach the outer lid 4 to the bottle opening 2.
3, the upper part of the hard inner cover 7 is press-fitted into the locking groove 8 and deformed to form a flange 14 (see FIG. 3). It is locked inside and held together. Therefore, when opening the bottle, the outer cover 4 and the inner cover 7 rotate together and rise in the direction of the rotation axis, so that the cut 10 easily breaks, leaving the retaining ring 11, and both caps attach to the bottle opening 23. come off from After opening, the cylindrical part 6 has a female thread-like spiral, and the flange 14 allows
Since both lids are integrated, the bottle opening 23 can be resealed extremely easily and reliably.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the invention. The screw cap of this embodiment corresponds to a bottle with a long bottle mouth 23 and a bottle neck 27 located relatively far from the mouth. A fastening ring 11 is connected to the entire circumference of the lower edge of the cylindrical portion 6 via a cut.

[Effects] As explained above, the screw cap of the present invention has a hard inner cap that fills the gap between the male thread of the bottle mouth and the female thread of the outer cap, and has a high airtightness. Since the inner lid is press-fitted into the locking groove of the outer lid and both lids are integrated, the lower cylindrical edge of the hard inner lid can be broken through the cut and the seal can be easily opened and resealed easily and reliably. It has the advantage of being actionable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a first embodiment of the present invention, Fig. 2 is a perspective view seen from below the inner cover of the above, Fig. 3 is a longitudinal sectional view showing the same as the above in use, and Fig. 4 is a perspective view showing the same as the above. A vertical cross-sectional view showing a second embodiment of the present invention, and FIGS. 5 and 6 are vertical cross-sectional views showing a conventional example. 1...head, 2...body, 3...female thread, 4...
...Outer lid, 5...Circular top, 6...Cylindrical part, 7...
Inner lid, 8...locking groove, 10...cut, 11...
...Fixing ring, 23...bottle mouth, 24...male thread.

Claims (1)

[Scope of Claims] 1. A downward-facing body is connected to the periphery of the head, and a female thread having an inner diameter slightly larger than the outer diameter of the male thread of the bottle mouth is carved on the inner peripheral surface of this body. A hard outer cover and a soft inner cover in which a cylindrical part with a wall thickness equal to the gap size between the male thread and the female thread plus the tightening allowance is connected downward to the periphery of the circular top that fits inside the outer cover. In a screw cap for a mouth bottle consisting of a combination, a retaining ring that fits into the bottle mouth is connected to the lower edge of the cylinder of the soft inner lid via a cut, and a circumferential ring is provided on the inner corner of the head of the outer lid. A screw cap characterized by having a locking groove extending in the direction.