JPH0939993A - Internal plug of bottle for carbonated beverage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal plug of a bottle for carbonated beverage, which is not accidentally opened even when a pressure in the bottle becomes high. SOLUTION: For an internal plug 1, a cylindrical fitting-in part 3 which is fitted in a bottle mouth 2, and a skirt part 4 to be fitted on the outside of the bottle mouth 2, and on the internal surface of which a multiple female thread, to be screwed with a multiple male thread on the external surface of the bottle mouth 2, is provided, are integrally formed of a synthetic resin with flexibility. Then, the upper ends of thread lines 8, 9 to constitute the multiple female thread are located on one straight line, and at the same time, between respective parts where the thread lines 8, 9 are superposed, thicker parts 11, 11 which are engaging parts through which thread lines 12, 13 of the multiple male thread on the bottle mouth 2 can pass when a specified or higher rotating force is received, are provided. The internal plug 1 which is constituted in such a manner is prevented from rotating even when the pressure in the bottle becomes high by the thicker parts 11, 11 being engaged with the thread lines 12, 13 on the bottle mouth 2, and the plug is not accidentally opened. When the internal plug is rotated in the direction to release the screwing between the male thread on the bottle mouth 2 and the female thread on the internal plug 1 by a force of a specified value or higher, the thicker parts 11, 11 are crushed, and the internal plug can be easily rotated, and opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle stopper for carbonated beverages such as soft drinks, and more particularly to a bottle bottle having a structure in which a bottle is unscrewed to open the bottle.

[0002]

2. Description of the Related Art A conventional plug of this type has, for example, as disclosed in Japanese Utility Model Laid-Open No. 7-40521, a cylindrical fitting portion that can be tightly fitted inside a bottle and an outside of the bottle. A skirt portion having a multi-threaded female thread on the inner surface to be fitted is integrally formed, while a multi-threaded male screw is provided on the outer surface of the bottle mouth, and the bottle mouth is located between the fitting portion and the skirt portion. In this state, the stopper is pressed against the bottle mouth, the multi-thread female screw is passed over the multi-thread male screw, and the upper surface of the multi-thread female screw and the lower surface of the multi-thread male screw are locked. is there. The inner plug is made of a soft synthetic resin having a predetermined elasticity, such as polyethylene.

In order to fill a carbonated beverage such as soft drink with a cap and make it into a product, a cylindrical outer cylinder made of a hard synthetic resin or a metal fixed to the inside of the skirt is attached to the inner plug. Be crowned. And to fix the outer cylinder to the inner stopper,
A plurality of vertically extending longitudinal grooves are provided on the outer circumference of the skirt portion, and a ridge that can be inserted into the longitudinal groove is provided on the inner surface of the outer cylinder.
The projection is aligned with the notch, and the outer periphery of the skirt is pushed down so as to cover the outer cylinder so that both are integrated.

[0004]

In the above-mentioned conventional example, for example, in the case of a soft drink bottle, heat sterilization at 65 ° C. for 10 minutes is required.
In addition to a high pressure of about ² kg / cm ² , if the environment in which it is placed is high during transportation, storage, etc., the inside of the bottle will have a considerably high pressure. Then, when the pressure in the bottle becomes high, the inside plug receives a strong pressure and rotates in the direction in which the screw is released, and there is a problem that the soft drink in the bottle is likely to blow out together with the gas. It was

An object of the present invention is to solve the above problems, and to provide a bottled cap for a carbonated beverage in which the bottled bottle is difficult to rotate unexpectedly in the direction in which the screwed state is released. With the goal.

[0006]

In order to achieve the above-mentioned object, the present invention, for example, an inner stopper of a carbonated beverage bottle is made of a synthetic resin having a predetermined flexibility, and is tightly fitted inside the bottle mouth. A tubular fitting portion that can be fitted, and a skirt portion that is fitted on the outside of the bottle mouth and that is provided on the inner surface with a multiple thread female screw that can be screwed into the multiple thread male screw on the outer surface of the bottle mouth, Further, each upper end of each thread forming the multi-thread female screw is located on a straight line, and at least one portion where the ends of two adjacent thread threads are vertically overlapped is provided. At least one of the spaces is provided with a locking portion that allows the thread of the multiple-thread male screw on the outer surface of the bottle to pass when a rotational force of a predetermined value or more is received.

Further, as the locking portion, a thick-walled portion which is formed to bulge inside the inner surface of the skirt portion is provided between the two overlapping screw threads.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. put it here,
FIG. 1 is a front view of a partial vertical section with a part cut away, and FIG. 2 is A of FIG.
-A line sectional view, FIG. 3 is a BB line sectional view of FIG. 1, FIG. 4 is a partial vertical sectional front view of the outer cylinder, and FIG. 5 is a vertical sectional front view showing a product state in which the inner plug and the outer cylinder are closed. .

As shown in FIGS. 1 to 3 and 5, the inner plug 1 is made of polyethylene, which is a soft synthetic resin having a predetermined flexibility, and is tightly fitted inside the bottle mouth 2 (see FIG. 5). A fitting portion 3 that can be fitted and a skirt portion 4 that fits on the outside of the bottle neck 2 are integrally formed with a canopy portion 5.

As shown in FIGS. 1 to 3 and 5, the fitting portion 3 has a cylindrical shape with its lower end opened, and the outer diameter of the lower portion is gradually reduced toward the lower edge. The small diameter portion 3a is formed. By providing the small diameter portion 3a, the fitting portion 3 can be easily fitted into the bottle mouth 2.

As shown in FIGS. 1 to 3 and 5, a plurality of vertical grooves 6 extending vertically from the upper portion to the lower portion of the skirt portion 4 are provided on the outer periphery of the skirt portion 4.・ The upper end of the space is provided with a mountain-shaped guide portion 7 ...
On the inner circumference of the lower part of the skirt portion 4, a multi-threaded female screw formed of two screw threads 8 and 9 extending in parallel and obliquely is formed. Further, the lower edge of the skirt portion 4 is provided with a projecting edge 10 formed to slightly project to the outside of the periphery.

As clearly shown in FIGS. 2 and 3, the threads 8 and 9 have the same length, and their upper ends 8 respectively.
a, 9a and the lower ends 8b, 9b are located on a straight line, and the upper end 8a and the lower end 9b and the upper end 9a and the lower end 8b are formed so as to overlap each other. Then, when a rotational force of a predetermined value or more is applied between the two portions where the vicinity of the upper end 8a and the lower end 9b and the vicinity of the upper end 9a and the lower end 8b overlap, the thread of the multi-thread male screw of the bottle can be passed. Such a thick portion 1 as a locking portion formed to bulge inside the inner surface of the skirt portion 4
1 and 11 are provided. The thick portions 11, 11 are the inner stoppers 1
When it is plugged into the bottle mouth 2 which will be described in detail later,
The lower ends 12a and 13a of the male threads of the male threads provided on the side opposite to the bottle lip are locked to prevent rotation, and a force of a predetermined amount or more is applied in a direction to unscrew the inner plug 1. When it is turned by, it is crushed by the flexibility of the material called polyethylene and has a thickness such that it can pass through the lower ends 12a and 13a and the screw threads 12 and 13, respectively.

As described above, the screw threads 8 and 9 are arranged such that their respective upper ends 8a and 9a and their respective lower ends 8b and 9b are aligned with each other, and that the upper ends 8a, the lower ends 9b and the upper ends 9a are arranged. In order to make the lengths such that the vicinity of the lower end 8b and the vicinity of the lower end 8b overlap, the central angle of each of the screw threads 8 and 9 is
60/2) + α] degrees, which is the length of the partial arc on the inner circumference of the skirt portion 4. However, α is a central angle of an arc corresponding to the lengths of the overlapping portions.

As another embodiment, the screw thread is
There are n threads (three threads or more). In this case, the length of each thread is the length of a partial arc having a central angle of [(360 / n) + α] degrees.

As shown in FIGS. 4 and 5, the outer cylinder 14 made of hard synthetic resin is used to cap the outer circumference of the skirt portion 4 when the outer cylinder 14 is closed to form a carbonated beverage product. It has an open tubular shape. Edge 1 of the upper opening of the outer cylinder 14
5 is slightly inwardly projected so as to engage with a step formed on the peripheral edge of the canopy portion 5 of the inner plug 1, and a projecting edge 16 at the lower portion thereof is bulged outwardly around the periphery. In addition, the outer cylinder 1
4. From the upper part to the central part of the inner surface 4, there are formed ridges 15 ... Which extend vertically so that they can be inserted into the vertical grooves 6 ...

Next, the bottle mouth 2 will be described. As clearly shown in FIG. 5, on the outside of the bottle mouth 2, there are provided multi-threaded male threads composed of two threaded threads 12 and 13 extending in parallel and obliquely. A neck portion 18 having an outer diameter smaller than the inner diameter of the multi-thread female thread portion is provided in which the threads 8, 9 of the multi-thread female thread provided in the skirt portion 4 of the inner stopper 1 are accommodated.

In order to close the bottle neck 2 with the inner bottle 1 and the outer cylinder 14 constructed as described above, first, the edge of the bottle neck 2 is positioned between the fitting portion 3 and the skirt portion 4 of the inner bottle 1. Then, the inner plug 1 is pressed against the bottle mouth 2, and the multi-threaded female screw is pushed over the multi-threaded male screw to cap it. The threads 8, 9 of the multi-threaded female screw thus overcome are stored in the neck portion 18. Subsequently, the outer cylinder 14 is pushed down so as to cover the skirt portion 4 from above, and the ridges 17 guided to the guide portions 7 ...
... are inserted into the vertical grooves 6 ..., respectively, and the closure is completed when the inside of the protruding edge 16 of the outer cylinder 14 engages with the protruding edge 10 of the skirt portion 4. At the time of this stopper, the skirt 4 is
Made of polyethylene, a soft synthetic resin,
Moreover, since the vertical grooves 6 ... Are provided, it is easy to bend, and the screw threads 8 and 9 of the multiple-thread female screw pass over the screw threads 12 and 13 of the multiple-thread male screw. Further, since the ridges 17 ... Of the outer cylinder 14 are guided to the guide portions 7 ... and are securely inserted into the vertical grooves 6, ..., it is not necessary to position the outer cylinder 14.
Furthermore, in this closed state, the projecting edge 1 of the skirt portion 4 is
Since the inside of the projecting edge 16 of the outer cylinder 14 is engaged with 0, there is no concern that the outer cylinder 14 may unexpectedly come off from the inner plug 1.

Next, in the opening operation, first, the inner plug 1 and the ridge 1
7 ... and the vertical grooves 6 ... are in an engaged state, and the outer cylinder 14 that rotates integrally is gripped and turned in a direction in which the screw can be unfastened with respect to the bottle mouth 2. Each thick-walled portion 11 formed between the threads 8 and 9 is a threaded piece 1 of a multi-threaded male screw provided in the bottle mouth 2.
Reach the lower ends 12a and 13a of 2 and 13, respectively. When the outer cylinder 14 is continuously rotated with a predetermined force or more, the inner plug 1 is also rotated, and the thick portion 11 is made of polyethylene so that the thickened portion 11 has the lower ends 12a, 1
When it is crushed by 3a and passed, and further rotated, the multithread female screw and the multithread male screw are unthreaded, and the bottle neck 2 is opened.

Then, the inner plug 1 constructed as described above is
Even if the inside pressure of the bottle increases due to high temperature during heat sterilization or environmental high temperature during storage, and the inner plug 1 tries to rotate in the direction in which it is unthreaded, 11 is the lower end 12a, 13 of the screw thread 12, 13 of the multiple thread male screw of the bottle mouth 2
Since it is locked to a and prevents the rotation, it is not opened unintentionally.

The present invention is not limited to the above-described embodiment, and for example, if the locking portion is capable of overcoming the multiple thread male screw on the outer surface of the bottle mouth when receiving a rotational force of a predetermined value or more, You may change to the protrusion etc. instead of the said thick part 11. Further, the number of threads of the multiple female thread may be three or more as long as the respective upper ends thereof are located on a straight line, and the portion where two adjacent thread threads overlap is the same as the above-mentioned embodiment. It is sufficient to provide at least one place instead of providing two places as in the embodiment. Further, the locking portion may be provided at least at one place between the overlapping screw threads.

[0021]

As described above, according to the present invention, even if the inner plug tries to rotate in the direction of being unscrewed due to the pressure in the bottle, the locking portion is a multi-threaded male screw having a bottle mouth. Since it is locked to the end of the screw thread to prevent the male screw and the female screw from rotating in a direction that allows the screw to be unthreaded, it is possible to prevent accidental opening of the screw. The effect that the cap can be forcibly rotated in the direction of unscrewing with a force equal to or greater than a predetermined value to open the plug.

Further, according to the present invention, in the case where the thick portion is provided as the locking portion, if the inner plug is forcibly rotated by a force of a predetermined value or more, the thick portion is formed by the screw thread end portion of the bottle mouth. The crushed state releases the locked state, and the stopper can be easily opened, and since it is not particularly complicated in shape, the inner stopper can be easily molded at the time of molding.

[Brief description of drawings]

FIG. 1 is a front view of a partial vertical section in which a part is cut away.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a partial vertical sectional front view of an outer cylinder.

FIG. 5 is a vertical cross-sectional front view showing a product state in which an inner plug and an outer cylinder are closed.

[Explanation of symbols]

 1 Inner stopper 2 Bottle 3 Fitting part 4 Skirt part 8 and 9 Screw thread 11 Thick part 12 and 13 Screw thread 14 Outer cylinder

Claims (2)

[Claims] 1. A cylindrical fitting portion which is made of a synthetic resin having a predetermined flexibility and which can be tightly fitted inside the bottle mouth, and a multiple thread male screw which is fitted on the outside of the bottle mouth and is on the outer surface of the bottle mouth. A skirt having an internal surface provided with a multi-threaded female screw capable of being screwed into the inner surface of the skirt, and the upper ends of the threaded threads forming the multi-threaded female thread are aligned and adjacent to each other. At least one part where the ends of the two screw threads overlap vertically is provided, and at least one position between the overlapped screw threads receives a rotational force of a predetermined value or more, and a multi-thread male screw on the outer surface of the bottle mouth. An inner stopper for carbonated drink bottles, which is provided with a locking portion that allows the strip to pass through. 2. The inner stopper of a carbonated beverage bottle according to claim 1, wherein the engaging portion is a thick portion that is formed to bulge inside the inner surface of the skirt portion.