JPH0449086Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cap configured to be capped by pressing from above against a bottle opening, and particularly to a cap that is screwed open after capping.

Conventional technology Conventionally, caps that have a threaded part formed on the outer circumferential surface and can be screwed open after being plugged into the mouth of the bottle have been used.
Caps made of soft synthetic resin materials such as polyethylene or vinyl chloride, or metals such as aluminum, with a synthetic resin liner fitted on the back side of the cap body are known.

On the other hand, the capping method involves rotating the cap loosely fitted over the bottle opening using the rotational force of the capping head, so that the cap has a threaded portion corresponding to the threaded portion of the bottle opening. There are two types of press-on threads: one is a rotary type that forms a bottle opening, and the other is a press type called a press-on thread that presses the cap from above against the bottle opening and transfers the threaded part of the bottle opening onto the inner surface of the cap by relaxing stress due to the creep phenomenon. Broadly classified.

Problems to be Solved by the Invention However, in the rotary capping method, the structure of the capping head is complicated, the capping machine is expensive, and the production cost of the cap is also high.

On the other hand, press type capping has the advantage that the capping machine mechanism is simple and inexpensive, and the production cost of the cap can be reduced. However, conventional caps capped using this method have the disadvantage that the contact area between the inner circumferential surface of the cap and the threaded portion of the bottle opening is large, resulting in large torque and difficulty in unscrewing. Adding a large amount of lubricant is effective in solving this drawback, but
This solution introduces the additional disadvantage of adversely affecting the contents of the bottle.

The present invention was developed in view of the above circumstances, and is a press-type cap.
To provide a cap that can be easily opened by reducing the torque when opening the cap without adversely affecting the contents of the bottle.

Means for Solving the Problems The present invention focuses on the point that in order to reduce the torque, it is sufficient to reduce the area of the inner circumferential surface of the cap that comes into contact with the outer circumferential surface of the bottle spout when the bottle is plugged. The inner peripheral surface of the cap is made of a soft synthetic resin material that can cause stress relaxation due to the creep phenomenon, and is located at a position corresponding to the threaded part when the bottle is plugged into the bottle opening. While forming a plurality of protrusions extending in the vertical direction at an angle greater than the lead angle of the threaded portion (including an inclination in the opposite direction to the threaded portion), preferably extending in the vertical direction, A threaded portion is formed at a lower portion, preferably at a spaced interval, which can be screwed into the threaded portion of the bottle opening, and which is located below the threaded portion of the bottle opening when the bottle is plugged.

Function: When the cap is pressed against the bottle opening from above to seal the bottle, the threaded portion formed on the inner circumferential surface of the cap deforms and climbs over the threaded portion of the bottle opening to form the desired capping state. By stress relaxation caused by the creep phenomenon, the threaded portion is transferred to the protruding strip on the inner circumferential surface of the cap located corresponding to the threaded portion, and a groove is formed in the shape of the thread. In addition, since the contact area with each other is small, the torque is also small, making it easy to unscrew and open the cap. When opening the cap, the threaded part of the cap screws into the threaded part of the bottle mouth during the twisting operation, so the opening action is almost the same as that of a rotary closure type cap, but the screw of the cap By providing the cap, it is possible to screw the cap back on after opening it, similar to a rotary closure type cap.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Here, FIG. 1 is a side view of the cap partially cut away, FIG. 2 is an end view showing the state of the cap plugged into the bottle opening, and FIG. 3 is a side view showing the bottle opening.

As shown in Fig. 3, four threaded threads 2, which are slightly longer than four equal parts of the outer circumferential surface, are provided on the outer circumferential surface of the bottle mouth 1 so that they overlap vertically at both ends of each thread. It is being Further, an annular jaw portion 3 is provided below the threaded portion 2 on the outer circumferential surface of the bottle mouth 1 with a sufficient distance therebetween.

On the other hand, as shown in Figs. 1 and 2, the cap 4 plugged into the bottle opening 1 is made of soft polyethylene, which is a soft synthetic resin that relaxes stress due to the creep phenomenon. is at least 10,000 or less, preferably 3,000 or less. The cap 4 has a pilfer-proof band 6a connected to the lower end of the main body 5, which has an inner diameter larger than the outer diameter of the threaded portion 2, through a perforation 6.

An annular projecting edge 7 is protruded from the inner surface of the top of the cap 4, and the upper end of the bottle opening 1 is held between the outer circumferential surface of the projecting edge 7 and the inner circumferential surface of the main body 5. is fitted into the bottle opening 1. When fitting, use the pilfer-proof band 6.
a engages with the jaw 3 of the bottle mouth 1.
Further, on the upper part of the inner circumferential surface of the main body 5 of the cap 4, there are screw holes extending parallel to each other and perpendicularly at positions corresponding to the threaded portions 2 when the cap 4 is plugged and fitted into the bottle mouth 1. A plurality of protrusions 8 are provided protrudingly. These protrusions 8 are formed such that the diameter of their inscribed circle is smaller than the outer diameter of the threaded portion 2 of the bottle opening 1.

A lower part of the inner peripheral surface of the main body 5 spaced apart from each of the protrusions 8 is capable of being screwed into the threaded part 2, and is positioned below the threaded part 2 when the bottle opening 1 is plugged. Four threaded portions 9 are formed. Each thread of the threaded portion 9 is formed to have a length corresponding to approximately four equal parts of the inner circumferential surface of the main body 5,
They are located at a slight interval in the circumferential direction at each end. Also, the inner diameter of the threaded portion 9 is the same as that of the bottle opening 1.
The outer diameter of the outer peripheral surface between the threaded portion 2 and the jaw portion 3 is set larger than the outer diameter of the outer circumferential surface between the threaded portion 2 and the jaw portion 3.

Since the present embodiment is constructed as described above, when the cap 4 is pressed against the bottle opening 1 from above, the threaded portion 9 of the cap is deformed and the threaded portion 2 of the bottle opening 1 is deformed.
The cap 4 is fitted onto the bottle spout 1 so that the upper end of the bottle spout 1 is held between the protrusion 7 and the main body 5, and the cap 4 is in the capped state shown in FIG. Then, a corresponding thread is transferred to the protruding thread 8 of the cap 4 located corresponding to the threaded portion 2 by stress relaxation due to the creep phenomenon, and a groove is formed in line with the thread. In this plugged state, the contact portion between the inner circumferential surface of the main body 5 of the cap 4 and the outer circumferential surface of the bottle mouth 1 is a groove formed in the protrusion 8 and a portion of the corresponding thread of the threaded portion 2. Therefore, the contact area is small and the torque is also small.

When the cap 4 is twisted in the opening direction in the capped state shown in FIG. and the grooves of the protrusions 8, it sequentially rotates and rises. This rise brings the threaded portion 9 of the main body 5 into a state where it is threaded into the threaded portion 2 of the bottle opening 1, and due to the action of these threaded portions 9 and 2, the main body 5 further rotates and rises, and the cap 4 can be opened.

On the other hand, once the cap 4 is opened, the threaded portion 9
Therefore, it is possible to screw the lid onto the bottle mouth 1 again and close the lid.

Note that the present invention is not limited to the embodiments described above; for example, the plurality of protrusions 8 are provided so as to extend parallel to each other and perpendicularly; Even if the threads are slanted, as long as they are extended in the vertical direction at an angle larger than the lead angle of the threaded portion 2, the above-mentioned effect can be sufficiently achieved. Further, the material of the cap 4 is not limited to soft polyethylene, but it is also possible to use a soft synthetic resin such as vinyl chloride that can cause stress relaxation due to the creep phenomenon. In addition, if the thread length of the threaded portion 9 (the total length of each thread in the case of a multi-thread thread) is set to approximately one circumference length of the inner peripheral surface of the cap 4 or less, the plugging operation becomes extremely easy. However, it is not particularly limited to this range, and even if the circumference is one circumference or more, the capping operation will not become impossible. Furthermore, the gap formed between the lower end of each protruding thread 8 and the upper end of each threaded thread 9 is not necessarily required, and there is no problem even if the two are in contact with each other. Furthermore, the pilfer-proof band 6a does not necessarily need to be provided.

Effects As is clear from the above explanation, according to the present invention, the contact area with the bottle opening can be reduced by providing the protruding stripes, thereby reducing torque, without adding a large amount of lubricant to the cap material. This makes it easier to open the bottle, and the provision of the threaded part has the beneficial effect of making it possible to screw the bottle back into the bottle mouth after opening to close the bottle.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, in which Fig. 1 is a partially sectional side view of the cap, Fig. 2 is an end view showing the state of the cap being plugged into the bottle opening, and Fig. 3 is a side view of the bottle opening. be. 1...Bottle opening, 2...Threaded portion, 4...Cap, 5...Body, 8...Protrusion, 9...Threaded portion.

Claims (1)

[Scope of utility model registration request] The cap is made of a soft synthetic resin material that can relieve stress through the creep phenomenon, and is made of a soft synthetic resin material that can relieve stress through the creep phenomenon. , while forming a plurality of protrusions extending in the vertical direction at an angle larger than the lead angle of the threaded part, which correspond to the threaded part when the bottle is plugged into the bottle mouth;
A cap characterized in that a threaded portion that can be screwed into the threaded portion of the bottle mouth is formed below these ridges.