JP3085619U - Metal screw lid - Google Patents

Abstract

(57) [Summary] (Problem corrected) [Problem] To provide a metal screw lid that does not impair the appearance of a screw lid due to a female thread portion and eliminates rigidity and insufficient strength. It has an inner / outer double structure in which the edge is turned inward, and the portion turned inward has a winding edge 24 that is wrapped around at the tip, and the tip that turns from the folded lower end to the winding edge 24 It has a threaded portion 26 because it is formed only on the inner surface between the portions.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a screw cap formed by sheet metal working.

[0002]

[Prior art]

 Many products have screw caps that can be screwed into containers, but plastic products are particularly widely used because of their high manufacturing flexibility and the ability to easily mass-produce various shapes and colors. Have been. On the other hand, there is a problem in disposal, and there are disadvantages such as burning harmful gas when burning plastic and limited reuse. On the other hand, in the case of a metal screw cap, the crests and valleys of the screw appear on the outer surface, and there is a problem that these irregularities impair the appearance, and it is difficult to use depending on the product.

Therefore, the present inventor has previously devised a screw cap having a structure in which the external appearance is not impaired even by a female screw portion, and registered the screw cap as a utility model (Registered No. 3058817). The idea is that the opening end of the lid body is folded inward and a female thread is formed in that part, and it has the feature that the appearance of the container is not impaired at all and has a sense of quality. However, it was found that there was a risk of insufficient rigidity at the inner folded part, and that there were serious conditions depending on the conditions, and research was conducted on this problem.

[0004]

[Problems to be solved by the invention]

 The present invention has been made in view of the above points, and a problem thereof is to prevent the external appearance of the screw cap from being impaired by the female screw portion, and to eliminate insufficient rigidity and strength. Another object of the present invention is to complete the technology as a metal screw cap.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the metal screw lid of the present invention has an inner / outer double structure in which the opening edge of the lid body is folded inward, and the part folded inward is wrapped around the tip. In addition to having a processed winding edge, it has a configuration in which it has a screw portion because it is formed only on the inner side surface between the folded lower end portion and the winding edge.

[0006]

[Embodiment of the invention]

 The metal screw cap according to the present invention is formed by sheet metal processing, and is screwed to a male screw formed on the outer periphery of the mouth of the container. The container is suitable for glass containers and plastic containers, and is also suitable for metal containers.

[0007] The metal screw cap is manufactured through a number of steps, for example, by drawing (see FIG. 5). Since the shape of the lid itself has a female thread on the inner surface, there are differences in conditions such as the size of the bore and the difference in depth. The lid body can be basically said to be in the shape of a cylindrical cylinder in which it is laid down, but naturally includes a hemispherical shape and a truncated cone shape.

The lid main body has an inner / outer double structure in which an opening edge, that is, a lower end portion of a folded container is turned inward. The length A of the folded portion can be set arbitrarily, and this has nothing to do with the depth of the lid body. That is, even a deep lid body may have a short turn, and a shallow lid body may have a relatively long turn within that range. The fact that this fold can be set to be longer or shorter, especially in the case of a shallow lid body with sufficient stiffness and strength even with a short fold, is a feature of the present invention.

[0009] At the front end of the part turned inward, a winding edge processed by winding is provided. By providing a winding edge, the rigidity is significantly increased. Between the folded underlined part and the leading edge of the winding edge, the space surrounded by the bending radius at the lower end and the bending radius of the winding edge and the outer surface and the inner surface at the maximum in the circumferential direction of the lid body. Can be formed. It is possible that this space is not partially formed, and in that portion, the inner surface and the outer surface have a double structure in contact with each other.

[0010] The winding edge is formed by rolling the lower end portion inward before turning over the peripheral side surface of the lid body. The fact that the winding edge is provided substantially in contact with the inner surface of the lid body is preferable because the rigidity of the winding edge backs up the outer surface of the lid body. As described above, the female screw portion is provided only on the inner surface between the folded lower end portion and the leading edge portion which is the winding edge. The internal thread portion may be provided in any manner as long as it is in the above-mentioned range of the folded inner surface. For example, it can be provided only at the lower end portion, only at the front end portion, or only at the intermediate portion.

The female thread portion can be provided for screwing with a male thread portion provided on a glass or plastic container. In this case, the female thread portion is provided at or near the tip of the inwardly folded portion. A female thread is provided. In this case, since the female screw portion is located only inside the lid body, it is difficult to see from the opening at the lower end, and the appearance is good.

[0012]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of a metal screw lid 20 for a glass (or plastic) container 10. The container 10 has a screw portion 11 on the outer periphery of a mouth. The mouth is closed by a seal 12.

The screw cap 20 of the first embodiment is shown as a relatively shallow, simple, folded cylindrical container, and its peripheral surface is formed of an outer surface 21 and an inner surface 22 folded inside. It has a heavy structure. The screw lid 20 shown in FIG. 2 has an outer side surface 21 and an inner side surface 22 in contact at a lower end portion 23, and has a winding edge 24 formed by winding in a tip end portion. A space 25 is formed between them, and a female thread portion 26 is formed on the inner surface 22 of the space 25 (FIG. 2). A packing 27 is provided on the top plate of the lid main body.

FIGS. 3 and 4 show an example of a metal screw lid 20 ′ for a metal container 10 ′. The container 10 ′ has a male screw portion formed on the outer periphery at a position slightly away from the upper end 15. 14. The upper end opening of the container 10 'is sealed by an inner lid 13 and has a pull top there.

The screw cap 20 ′ of the second embodiment is shown as being deeper than that of the first embodiment. It is stopped, and a female thread portion 29 is formed on the inner surface 22 between the leading edge and the winding edge 28. Other configurations may be the same as those in the first embodiment, and the detailed description is omitted by using the reference numerals of the first embodiment. Although the packing 27 is illustrated in both the first embodiment and the second embodiment, this does not mean that packing is indispensable in the present invention, and it is needless to say that packing may be omitted.

The metal screw caps 20 and 20 ′ of the present invention having such a configuration can be manufactured according to the process shown in FIG. The lid bodies 10, 10 'are formed in a cylindrical shape in which they are turned down by processing a steel plate or a thin plate of an aluminum alloy or other metal plates, and are subjected to preliminary processing for bending the downward open end 30 inward (see FIG. 5a). Next, the work of winding the opening end 30 round inside is performed by using a winding die, and the winding edge 24 is formed at the tip end portion (FIG. 5B).

Thereafter, the opening edge of the lid body 10 is turned inward, and the winding edge 24 comes into contact with the inner peripheral surface, and the winding radius of the outer surface 21, the inner surface 22, and the lower end 23 and the winding edge 24 are adjusted. A space 25 surrounded by the bending radius is formed. The length A of the overlap between the outer side surface 21 and the inner side surface 22 can be as long as shown in FIG. 5c1 or as short as shown in FIG. 5c2. It can be considered that the longer the length A of the overlapping portion, the higher the strength of the lid body 10, and the optimum structure is determined in consideration of the material and the position of the female thread portion.

The position and form of the female thread 26 can be arbitrarily determined. FIG. 5d1 shows an example in which the female thread 26 is partially formed only at the lower end of the folded portion, and FIG. 5d3 shows an example in which the female thread 26 is partially formed only at the tip of the folded portion. . On the other hand, in the case of FIG. 5d2, the female screw portion 26 is formed over almost the entire area of the folded portion. Therefore, in the context of the above description, the female thread portion 26 in FIG.

[0019]

[Effect of the invention]

 Since the present invention is constructed and operated as described above, the female screw portion is formed only on the inner surface of the inner / outer double structure, and the unevenness of the screw does not appear on the outside. The thread pattern does not appear in the appearance, and the rigidity strength is dramatically increased by the winding edge formed at the tip, the accuracy of the female thread is improved, the operation feeling of screwing is improved, and at the same time it can not be used conventionally In addition, metal materials such as aluminum, which were difficult to use, can be used sufficiently for caps, and the cap itself can be freely formed from shallow to deep, simple, luxurious, and free. Play a fruit.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a metal screw cap according to the present invention.

FIG. 2 is a sectional view of the above.

FIG. 3 is a perspective view of Example 2;

FIG. 4 is a sectional view of the above.

FIG. 5 is an explanatory view showing a manufacturing process of the metal screw cap according to the present invention.

[Explanation of symbols]

 10, 10 'Container 11, 14 Male thread 20, 20' Screw lid 21 Outer surface 22 Inner surface 24, 28 Rolling edge 25 Space 26, 29 Female thread

Claims (4)

[Utility model registration claims] 1. A screw lid formed by sheet metal processing, wherein the screw lid has an inner / outer double structure in which an opening edge of a lid main body is turned inward, and a part turned inward is processed by being wound into a tip. A metal screw cap having a winding edge and a screw portion formed only on the inner surface between the folded lower end portion and the leading edge portion. 2. The lid according to claim 1, wherein a space surrounded by the outer surface and the inner surface is formed in a circumferential direction of the lid main body from the folded lower end portion to the leading end portion which is a winding edge. Metal screw lid. 3. The winding edge according to claim 1, wherein the winding edge is formed by winding the lower end portion of the peripheral side surface of the lid body around the entire circumference before turning over, and substantially contacting the inner surface of the lid main body. Metal screw lid. 4. The female thread portion is provided for screwing with a male thread portion provided on a glass or plastic container, and is located near the tip of a portion turned inward. The metal screw lid according to any one of claims 1 to 3, wherein: