JP2002347799A - Safety structure of metal cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety structure of a metal cap, preventing an injury caused by a sharp broken portion of a ring remained at the container side. SOLUTION: The metal cap 1 is provided with a cylindrical part 3 for screw, which is equipped with a screw part which is threadably fitted to the screw part of a container, an easily breakable portion 6 connected to the lower part of the cylindrical part 3 for screw and broken when opening the cap, and the rest of the ring 5 at the container side, which is connected to the easily breakable portion 6. A part extending from the lower part of the cylindrical part 3 for screw to the ring 5 is folded two times in a way that the outer peripheral surface side of the upper part of the ring 5 covers the outer peripheral surface side of the lower part of the cylindrical part 3 for screw. A first folding part 11 and a second folding part 12, which have folding directions opposed to each other, form a superposed part 10. When the easily breakable portion 6 is made to be the superposed part except the one which is the outermost peripheral part, the easily breakable portion 6 is formed above the first folding part and below the second folding part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cap screwed into an opening of a container, and more particularly, to a ring formed at a lower end of a cylindrical screw portion, which is opened to a container after opening. The present invention relates to a metal cap configured to be left.

[0002]

2. Description of the Related Art As a structure of a metal cap applied to a container filled with a beverage or the like, a ring (a pill fur proof hem) is opened in a band shape when the container is opened and separated from the cap body. 2. Description of the Related Art A metal cap having an opening indication characteristic has been widely put to practical use. As this type of metal cap, for example, caps described in JP-A-6-135449 and JP-A-8-244805 have been proposed.

A conventional cap proposed in Japanese Patent Application Laid-Open No. Hei 6-135449 has a top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, and the skirt wall extends in the circumferential direction. The skirt wall is divided into a main portion above the circumferential weakening line and a ring portion below the main portion. The circumferential weakening line is composed of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions located between the slits, wherein the bridging portion is a single wreck. It includes a break bridge and a plurality of easily breakable bridges. The circumferential length of the hard-to-break bridging portion is longer than the circumferential length of the easy-to-break bridging portion, and the ring portion is adjacent to the hard-to-break bridging portion as viewed in the opening direction and immediately thereafter. An axial weakening line extending downward in the axial direction is formed from the located slit, and a score extending in the circumferential direction is formed in the hard-to-break bridge portion. Then, a first score extending in a circumferential direction from a front end of the difficult-to-break bridge portion in the opening direction as viewed in the opening direction, and a first resistance extending in a circumferential direction following the first score. A second score extending in the circumferential direction following the first resistance portion, and a second resistance portion extending in the circumferential direction to the rear end of the hard-to-break bridge portion following the second score is formed. ing.

In the metal cap described in Japanese Patent Application Laid-Open No. 6-135449, the entire cap including the ring portion is a metal cap which is detachable from the mouth and neck of the container. It is stated that the pill fur proof hem can be easily and smoothly cut off after the container lid is detached from the mouth and neck part without fail to reliably prevent the pill fur proof from remaining.

The conventional cap proposed in Japanese Patent Application Laid-Open No. 8-244805 discloses a cap provided with a ring provided on the opening end side of the cap body, and connecting the ring with the cap body. A plurality of bridges, wherein one of the bridges is a wide bridge, a horizontal slit is provided between the bridges, and a vertical score is provided on the ring portion, and the wide bridge is supplemented. A metal cap provided with a score, wherein a notched cross section of the auxiliary score has a wedge shape, and an angle formed by an upper surface thereof and a vertical surface is 60 to 110.
The angle between the upper surface and the lower surface is 50-100 degrees, and the angle between the lower surface and the vertical surface is 10-50 degrees.

According to the cap described in Japanese Patent Application Laid-Open No. Hei 8-244805, a ring does not remain at the container opening when the cap is opened, and the opened band can be easily separated from the main body. In addition, it is said that burrs and thin blade-shaped cut surfaces can be prevented from being generated on the cut surface.

In the above-described metal cap, the ring portion is broken by opening the cap, and the ring portion is removed from the container together with the cap, so that the pill fur proof function can be achieved. Then, the role is completed by breaking the ring portion, but in the conventional structure described above,
Since it is detached from both the container and the cap, the broken ring portion may be left as dust.

A cap capable of solving such a problem is described in Japanese Utility Model Laid-Open Publication No. 53-75344. The cap described in this publication is a cap in which safety measures are taken against a sharp part caused by the breakage of the ring part, and includes a first bent part, a second bent part and an inward part at the lower end of the annular peripheral hem screw part. And a container-side remaining portion connected to the lower side of the second bent portion of the overlapping portion through a circumferential perforated connecting portion, at least corresponding to an upper end of the perforated connecting portion. The lower edge of the second bent portion is configured to be located above the first bent portion.

[0009]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 6-1
According to the caps described in JP-A-35449 and JP-A-8-244805, the ring portion is broken by opening the cap, so that the pill fur proof function can be ensured. There is a problem that the part becomes garbage. On the other hand, the above
In the structure described in JP-A-75344, the ring portion can be attached to the container and left in a state, so that generation of dust can be eliminated. Further, in the cap described in Japanese Utility Model Application Laid-Open No. 53-75344, the cut portion of the perforated connecting portion of the cap is hidden inside the overlapped portion, so that the sharp portion generated in the cap is outside. It doesn't appear and safety can be secured. However, the container to which the above cap is attached is used not only for a container for pouring out the contents of another container such as a cup, but also for a container for directly drinking by putting the lips on the opened mouth and neck. . In such a case, the lips may hit the ring portion remaining on the container side, but in the above-described structure, the sharp perforated connecting portion generated in the ring appears outside, so that the lips There was a possibility of memorizing or being hurt.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a metal cap which can secure safety by a broken portion of a ring portion remaining on a container side after opening.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a screw cylindrical portion having a screw portion screwed to a screw portion of a container, and a lower end of the screw cylindrical portion. Of a metal cap having a perforated connecting portion that is connected to the opening portion and that is broken when opened, and a container-side remaining ring portion that is connected to the screw cylindrical portion via the perforated connecting portion. In the structure, a portion extending from the lower portion of the screw cylinder to the container-side remaining ring portion such that an upper portion of the container-side remaining ring portion covers an outer peripheral surface of a lower portion of the screw cylinder portion. The first bending portion and the second bending portion having the bending directions opposite to each other are bent twice to form an overlap portion, and the broken portion is the overlap portion other than the overlap portion serving as the outermost peripheral portion. And the second bent portion is higher than the first bent portion. Also the structure, characterized in that formed below.

Therefore, according to the present invention, when the metal cap mounted on the container is turned in the opening direction, the metal cap is moved in the axial direction by the action of the screw part, and as a result, the screw cylindrical part is A pulling force and a shearing force act on the perforated connecting portion connecting the ring portion, and this connecting portion is finally cut. In this way, the metal cap is removed from the container, and the ring is left attached to the container. At the upper end portion of the remaining ring portion, that is, at the end portion where the perforated connection portion was formed, a sharp portion has been generated due to the above breakage,
Since the perforated connecting portion is formed inside the above-mentioned overlapping portion, the sharp portion remains at a position hidden behind the inner peripheral side of the ring portion and is not exposed to the outside. That is, even if the lips are brought into direct contact with the opening of the container, the lips do not come into contact with the sharp breaks formed in the ring portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to a specific example shown in the drawings. FIG. 1 shows a specific example of a metal cap according to the present invention. The metal cap 1 includes a cap body 4 including a top plate 2 and a cylindrical portion 3 for a screw portion hanging down from the periphery thereof. A ring portion 5 provided on the opening end side of the cap body 4, and a perforated connecting portion 6 connecting the ring portion 5 and the cap body 4. A sealing member 7 made of a soft synthetic resin material is provided on the inner surface side of the top plate 2.

The cylindrical portion 3 is a portion in which a screw portion is formed by roll forming from the outer peripheral surface side after being mounted on the mouth and neck of a container (not shown). The ring portion 5 is a portion that undergoes diameter reduction processing so as to engage with an annular convex portion (bead portion) formed below the screw portion of the container.
The perforated connecting portion 6 is a so-called easily breakable portion, and a plurality of narrow bridges 8 connecting the cap body 4 and the ring portion 5 are formed at regular intervals in a circumferential direction. The portion between the bridges 8 is a slit 9.

In the metal cap 1 shown in FIG. 1, an overlapping portion 10 is formed at the boundary between the cap body 4 and the ring portion 5. FIG. 2 shows the structure of the overlapping portion 10 in an enlarged manner, and a portion slightly lower than the above-described perforated connecting portion 6 is bent outward and turned upside down, and this portion is folded. The first bent portion 11 is formed. Further, a portion closer to the ring portion 5 than the first bent portion 11 is bent outward so as to be turned upside down, and this portion is bent so as to be turned upside down.
It is 2. In other words, the first bent portion 11 is bent upward, and the second bent portion 12
In the example, the overlapping portion 10 is formed by bending the overlapping portion 10 downward.

The perforated connecting portion 6 is formed above the lower edge of the first bent portion 11 and below the upper edge of the second bent portion 12. More specifically, it is formed at the lower end of the cylindrical portion 3 and above the lower edge of the first bent portion 11. Therefore, the perforated connecting portion 6 is located inside the upper end portion of the ring portion 5, and the bridge 8 is concealed from the outer peripheral surface side by the ring portion 5. If the position of the perforated connecting portion 6 is described in terms of function, the broken portion on the ring portion 5 side caused by the breakage of the bridge 8 is different from the overlapping portion other than the overlapping portion serving as the outermost peripheral portion. And
The position of the perforated connecting portion 6 is set so as to be higher than the first bent portion and lower than the second bent portion.

The above-mentioned metal cap is formed, for example, from a thin plate made of an aluminum alloy by pressing to form a bottomed cylindrical body, and after trimming, knurling for continuously forming fine irregularities on the outer peripheral surface of the upper end. Processing is performed, and slit and bridge forming the perforated connecting portion 6 are performed, and further, bead forming convex on the outer peripheral side for forming the overlapping portion 10 is performed. The intermediate body thus obtained can be manufactured by further performing reform molding including a process of crushing the bead portion so as to be folded.

After this metal cap is mounted on the mouth and neck of a container (not shown), the cylindrical portion 3 is subjected to roll forming from the outer peripheral surface side to follow the screw portion of the mouth and neck. At the same time, the lower end portion of the ring portion 5 is reduced in diameter and is engaged with an annular bead portion formed on the mouth and neck portion.

When the metal cap thus attached to the container is rotated in the opening direction, the cap body 4 moves so as to come out of the mouth and neck by the action of the screw, and the ring 5 Is engaged with the bead portion of the mouth and neck and does not move in the axial direction, so that a pulling force and a shearing force act on the bridge 8 between the cap body 4 and the ring portion 5. Since the bridge 8 is a low-strength portion having a narrow width, the bridge 8 eventually breaks and the cap body 4
Can be removed from the mouth and neck of the container and opened.
On the other hand, the ring portion 5 is left on the container side.

A portion of the broken bridge 8 remains in the ring portion 5 remaining on the container side, and the tip of the bridge portion 8 has a broken surface or a broken line. The broken portion on the side of the ring portion 5 tends to be a sharp edge. However, in the metal cap described above, since the perforated connecting portion 6 is formed inside the overlapping portion 10, The fractured portion is hidden inside the overlapping portion 10. As a result, even when the lips are directly attached to the mouth and neck of the container and the contents are to be drunk from the container, the sharp breaks generated in the ring portion 5 do not come into contact with the lips.

In the above-described specific example, the position of the easily breakable portion is determined by the ring portion in the innermost layer 15 of the superposed portion 10 (formed of the outermost layer 13, the intermediate layer 14, and the innermost layer 15) composed of three layers. 5, it is positioned closest to the first bent portion 11, but the easily breakable portion in the present invention is located above the first bent portion 11 in the innermost layer 15 of the three-layered overlapping portion 10. It may be located below the second fold 12, or may be located above the first fold 11 and below the second fold 12 of the intermediate layer. In addition, the example in which the easily breakable portion is a perforated connection portion has been described, but the easily breakable portion in the present invention is other than the perforated connection portion, for example, a thin line is engraved to make the remaining thickness thinner than other portions. It may be a score line obtained.

[0022]

As described above, according to the present invention,
By turning the metal cap attached to the container in the opening direction, the perforated connecting portion connecting the screw cylindrical portion and the ring portion is broken, the ring portion remains on the container side, and the cap is removed. Removed from container. The resulting sharp break on the ring portion side is left behind by the formation of the overlapped portion and hidden on the inner peripheral side of the ring portion, so that it is not exposed to the outside, and therefore the opening of the container Even when the lips are brought into direct contact with the lip, the lips do not feel pain due to contact with the sharp breaks formed in the ring portion, and are not hurt, thus ensuring safety.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing a specific example of a safety structure according to the present invention.

FIG. 2 is an enlarged sectional view of the overlapping portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cap, 3 ... Tube part, 4 ... Cap body, 5
... Ring part, 6 ... perforated connection part, 10 ... overlapping part, 11 ... 1st bending part, 12 ... 2nd bending part, 13 ... outermost layer, 14 ... middle layer, 15 ... innermost layer.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E084 AB01 BA01 CA01 CC02 DA01 DB05 DB12 DB20 DC02 FA09 FB02 GA04 GB04 GB08 HA02 HB03 HC03 HD01 HD03 HD04 KA13 KB01 LA05

Claims (1)

[Claims] 1. A screw cylindrical portion having a screw portion screwed to a screw portion of a container, an easy breakable portion connected to a lower end portion of the screw cylindrical portion and broken at the time of opening, and In a safety structure of a metal cap having a container-side remaining ring portion connected to the screw cylinder portion via a break portion, an upper portion of the container-side remaining ring portion is a lower portion of the screw cylinder portion. A first bent portion and a second bent portion in which a portion from a lower portion of the screw cylindrical portion to the container-side remaining ring portion is bent twice so as to cover an outer peripheral surface side, and bending directions are opposite to each other. And the overlap portion is formed, and the easily breakable portion is the overlap portion other than the overlap portion which is the outermost peripheral portion, and is above the first bent portion and below the second bent portion. A metal cap safety structure characterized by being formed.