JPH072262A - Container cap made of synthetic resin - Google Patents

Abstract

PURPOSE:To surely prevent a yielding line in the direction of the periphery from being broken in attaching a container cap to the neck of a container mouth and achieve easy and secure brake in opening the container, by forming a plurality of openings in the bottom of a tamper evident, and disposing a movable support, which has an engaging means on its internal surface, in each opening. CONSTITUTION:A container cap 2 is attached to a container mouth 40 and twisted tightly, and when passing an engaging jaw 44 made on the periphery of the neck of the mouth 40, an engaging means 38 made on the internal surface of the bottom 16 of a tamper evident is elastically displaced radially outward having its lower end as a turning point. Together with this, a movable support 28 is elastically displaced radially outward having its lower end as a turning point. Therefore, because torque causing rotation for closing which is applied to the container cap 2 may be small, a yielding line 12 in the direction of the periphery is not broken. When the container cap 2 is twisted to open the neck of the container mouth 40, the yielding line 12 easily breaks because the engaging means 38 is engaged with the engaging jaw 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin container lid, and more particularly to a synthetic resin container lid having a tamper-evidence characteristic (a characteristic in which evidence indicating the fact remains when tampering is performed). .

[0002]

2. Description of the Related Art A container lid having tamper-evidence characteristics for a container such as a beverage bottle is disclosed in, for example, JP-A-54.
-83588, JP-A-56-74445,
Japanese Utility Model Publication No. 56-125848 and Japanese Patent Laid-Open No. 58-16.
As disclosed in Japanese Patent No. 0257, various types of synthetic resin container lids have already been proposed. These synthetic resin container lids include a circular top surface wall and a cylindrical skirt wall that hangs from the peripheral edge of the top surface wall. A circumferential weakening line extending in the circumferential direction is formed on the skirt wall,
The skirt wall is divided into a main part above the circumferential weakening line and a tamper-evidence skirt below the circumferential weakening line. A female thread is formed on the inner surface of the main portion of the skirt wall, and a plurality of locking means projecting inward in the radial direction are arranged at intervals in the circumferential direction on the inner surface of the tamper-evident skirt portion. There is.

Such a container lid is applied to a container in which a male screw thread and a locking jaw portion located below the male screw thread are formed on the outer peripheral surface of the mouth and neck portion. When attaching the container lid to the mouth and neck to seal the mouth and neck, cover the container lid on the mouth and neck, and then rotate the container lid in the predetermined closing direction with respect to the mouth and neck to close the skirt wall. The female thread formed on the inner surface of the main portion of the above is screwed into the male thread formed on the outer peripheral surface of the mouth and neck. During such a mounting operation, the locking means formed on the inner surface of the tamper-evidence skirt is elastically deformed or displaced radially outward to move the locking jaw of the mouth and neck. After that, it is elastically restored inward in the radial direction and locked on the lower surface of the locking jaw.

When opening the mouth and neck of the container, the container lid is rotated in the opening direction with respect to the mouth and neck. Thus, the female screw thread formed on the inner peripheral surface of the main part of the skirt wall is moved along the male screw thread formed on the outer peripheral surface of the mouth / neck part, so that the container lid is rotated upward. Can be moved. However, since the locking means formed on the inner surface of the tamper-evidence skirt is locked to the locking jaw of the mouth / neck, the tamper-evident skirt is prevented from moving upward. . Thus, considerable stress is generated in the circumferential weakening line formed in the skirt wall, breaking the circumferential weakening line and separating the tamper-evident skirt from the main portion of the skirt wall. Then, the container lid is detached from the mouth and neck, leaving the tamper-evidence hem, and the mouth and neck is opened. Alternatively, if an axial weakening line is formed on the tamper evidence hem,
The axial weakening line is broken and the tamper-evidence skirt is expanded from the endless ring shape to the band shape, while the circumferential weakening line is maintained without being partially broken, and the tamper-evident skirt is a skirt. Stay connected to the wall. Then, the entire container lid is separated from the mouth and neck, and the mouth and neck is opened.

[0005]

Therefore, in the container lid of the above-mentioned form, when the container lid is attached to the mouth and neck of the container, the locking formed on the inner surface of the tamper-evidence skirt. The means can be elastically deformed or displaced radially outwardly enough to pass through the locking jaws of the mouth and neck, so that the required rotational torque to be applied to the container lid is sufficiently small,
It is important to ensure that the circumferential weakening line formed on the skirt wall is not broken. On the other hand, when opening the mouth-neck of the container, the locking means formed on the inner surface of the tamper-evident hem is securely and securely engaged with the locking jaw formed on the outer surface of the mouth-neck. If it is stopped, the circumferential weakening line is easily and ruptured as required, and the container lid is detached from the mouth and neck without breaking the circumferential weakening line. It is important to ensure that properties are not impaired).

However, the conventional synthetic resin container lid has the above-mentioned 2
Both requirements cannot be met sufficiently stably. By increasing the breaking strength of the circumferential breaking line or facilitating the elastic deformation or displacement of the locking means, the breaking of the circumferential weakening line when the container lid is attached to the mouth and neck of the container is sufficiently avoided. With Seshimen, a considerably large torque is required to break the circumferential weakening line when opening the mouth and neck of the container, making it especially difficult for women or children to open the opening, or breaking the circumferential weakening line. There is a tendency that the container lid is detached from the mouth and neck without being accompanied. On the contrary, by reducing the breaking strength of the circumferential weakening line or making the elastic deformation or displacement of the locking means difficult, the circumferential weakening line can be easily and surely opened when opening the mouth and neck of the container. If you let it break,
When the container lid is attached to the mouth and neck of the container, the circumferential weakening line tends to be broken.

The present invention has been made in view of the above facts, and its main problem to be solved is to satisfy the above two requirements in a sufficiently stable manner, and to install the container lid on the mouth and neck of the container. The direction weakening line is surely avoided from being broken, and the circumferential direction weakening line is sufficiently easily and surely broken as required when opening the mouth and neck of the container,
An object is to provide an improved synthetic resin container lid.

[0008]

In the present invention, in order to achieve the above-mentioned problem, a plurality of openings are formed in the tamper-evidence skirt at circumferential intervals with a radius in each of the openings. A movable support portion is provided which is movable outward in the direction but is prevented from moving inward in the radial direction, and a locking means protruding radially inward is formed on the inner surface of the movable support portion.

That is, according to the present invention, as a synthetic resin container lid that achieves the above-mentioned problem, a top wall and a cylindrical skirt wall hanging from the top wall are provided, and the skirt wall has a circumferential direction. A circumferential weakening line is formed, and the skirt wall is divided into a main portion above the circumferential weakening line and a tamper-evidence skirt below the circumferential weakening line. A female screw thread is formed on the inner surface of the main portion of the skirt wall, and a plurality of locking means protruding inward in the radial direction are arranged at intervals in the circumferential direction on the tamper evidence skirt. In the container lid made of synthetic resin described above, a plurality of openings are formed in the skirt of the tamper evidence at intervals in the circumferential direction, and each of the openings is movable radially outward. There is a movable support that is prevented from moving inward in the radial direction. Parts are arranged, locking means are formed on the inner surface of the movable support unit, the plastic container closure, wherein provided that.

In a preferred embodiment, the opening is rectangular and the lower end of the movable support is connected to the tamper-evidence skirt so that the lower end is pivotable radially outward with the lower end as a pivot. Is. When the circumferential weakening line includes a plurality of slits extending in the circumferential direction at intervals in the circumferential direction, the opening is extended to the upper end of the tamper-evidence skirt so as to be continuous with the slit. You can also In another embodiment, the opening extends to the lower end of the tamper-evidence hem and is released downwards, the movable support being connected to the tamper-evidence hem on both sides circumferentially at the lower end. The lower end thereof can be turned outward in the radial direction with both sides in the circumferential direction as turning fulcrums. It is preferable that the locking means extends from the inner surface of the movable support portion upward in a radially inwardly inclined manner. Preferably, a constrained surface is formed at the upper end of the movable support portion so as to extend upward and incline radially outward,
A restraint surface is formed on the skirt wall so as to extend upward and outward in the radial direction. The restraint surface is positioned inside the restrained surface in the radial direction, and is outside the restrained surface in the radial direction. Inward movement is allowed, but radial inward movement is blocked. The movable support portion and the locking means can be formed by forming the movable support portion and the locking means so as to extend downward from the tamper-evidence hem portion and then folding back inside.

[0011]

In the container lid made of synthetic resin of the present invention, when the container lid is mounted on the mouth and neck of the container, the locking means is elastically deformed or displaced outward in the radial direction, and the locking is performed. The movable support part, on which the means is formed, is elastically moved radially outwards, thus allowing the locking means to pass through the locking jaws of the mouth and neck with sufficient ease and thus overshoot the circumferential weakening line. It is ensured that the stress of 1 is generated and broken. When the mouth / neck of the container is mounted as required, the movable support is prevented from moving inward in the radial direction, so that the locking means is locked to the locking jaw of the mouth / neck sufficiently securely. Therefore, when opening the mouth / neck portion, the circumferential break line can be broken easily and surely.

[0012]

The preferred embodiments of the synthetic resin container lid constructed according to the present invention will now be described in more detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, according to the present invention, generally designated by the numeral 2, which can be formed by injection molding or compression molding from a suitable synthetic resin material such as polyethylene, polypropylene or polyethylene terephthalate. The constructed container lid comprises a circular top wall 4 and a cylindrical skirt wall 6 depending from the peripheral edge of the top wall 4. An annular holding ridge 8 is formed on the upper end of the inner surface of the skirt wall 6, and a region surrounded by the annular holding ridge 8 is separately molded from a relatively flexible synthetic resin such as soft polyethylene. A liner member 10 is provided, which is convenient. A circumferential weakening line 12 extending in the circumferential direction is formed on the skirt wall 6, and the skirt wall 6 includes a main portion 14 above the circumferential weakening line 12 and a tamper evidence hem below the circumferential weakening line 12. It is divided into a part 16 and a part 16. The circumferential weakening line 12 itself is composed of a plurality of circumferentially spaced slits (cutting grooves) 18 extending in the circumferential direction, and a plurality of bridging portions 20 left between the slits 18. The tamper-evidence skirt 16 is connected to the main portion 14 via a plurality of bridging portions 20. An anti-slip concavo-convex shape 22 is formed on the outer surface of the main portion 14 of the skirt wall 6. A female thread 24 is formed on the inner surface of the main portion 14.

Continuing the description with reference to FIGS. 1 and 2,
A plurality of openings 26, which may be, for example, eight, are formed in the tamper-evidence skirt 16 that is thinner than the main portion 14 at intervals in the circumferential direction. Such opening 26
Each of may be rectangular. A movable support portion 28 is arranged in association with each of the openings 26. Such movable support portion 28
Is connected to the body of the tamper-evidence skirt 16 via a thin-walled extension 30 that defines the lower edge of the opening 26. The thin extending portion 30 has sufficient flexibility, and the movable supporting portion 28 is relatively easily rotatable about the thin extending portion 30 as a turning center (in other words, the lower end of the movable supporting member 28 is a turning fulcrum). Is. At the upper end of the movable support portion 28, a constrained surface 32 is formed that extends upward and inclines radially outward. On the other hand, in the body portion of the tamper-evidence skirt portion 16, a portion that defines the upper edge of the opening 26, a guide surface 34 that is preferably inclined downward toward the outside in the radial direction, Following the guide surface 34, a constraining surface 36 that extends upward and inclines radially outward is formed. The constraining surface 36 is positioned radially inward of the constrained surface 32 of the movable support member 28, thus moving the movable support member 28 outward in the radial direction, and more specifically, the movable support member 28 moves its lower end at its lower end. Although it is allowed to swing outward in the radial direction as a swing fulcrum, the movable support member 2
8 moves inward in the radial direction, more specifically, the movable support member 2
8 is prevented from turning inward in the radial direction with its lower end as the turning fulcrum. On the inner surface of each of the movable supporting members 28, there is formed a locking means 38 in the form of a flap piece that extends upward in a radial direction from the lower end portion thereof so as to be inclined inward.

As described above, the container lid 2 can be conveniently formed by injection molding or compression molding from an appropriate synthetic resin material, but in the case of injection molding or compression molding, it is shown by a chain double-dashed line in FIG. As described above, the movable support portion 28 and the locking means 38 extend downward from the thin-walled extending portion 30, and more specifically, the movable support portion 28 extends downward substantially vertically and the locking means 38 extends downward. It is expedient to shape it in such a way that it extends somewhat radially outwards towards it. In the case of molding in such a form, it is possible to avoid an excessive so-called forcible punching at the time of die cutting without using a complicated split die. After injection molding or compression molding, the movable support portion 28 and the locking means 38 can be folded back inward to the final form shown by the solid lines in FIGS. In such a folding operation, the movable support portion 28
Is elastically deformed to some extent so as to pass through the guide surface 34 existing on the upper edge of the opening 26, and then elastically restored so that the constrained surface 32 faces the constraining surface 36. It is located on the outer side in the radial direction. Restraint surface 36
Is located inside the constrained surface 32 so that the upper end of the movable support portion 28 is prevented from moving inward in the radial direction, so that the movable support portion 28 and the locking means 38 are not bent. Is prevented from returning to the state.

Referring to FIG. 3 together with FIGS. 1 and 2, the container lid 2 described above is applied to a container having a mouth / neck portion 40 of the form shown in FIG. The neck / neck portion 40 of the container, which can be formed of a suitable synthetic resin such as polyethylene terephthalate or glass, has a cylindrical shape as a whole, and has an external thread 42 on its outer peripheral surface and a locking jaw portion 44 located below the male thread 42. And are formed.

To mount the container lid 2 on the mouth / neck portion 40, the container lid 2 is fitted on the mouth / neck portion 40 and rotated in the closing direction (clockwise when viewed from above in FIG. 3). As a result, the female thread 24 formed on the container lid 2 is screwed into the male thread 42 formed on the mouth / neck portion 40, whereby the container lid 2 is moved downward with rotation. And FIG.
When the container lid 2 is moved downward to the state shown in FIG.
The liner member 10 arranged on the inner surface of the top wall 4 is brought into close contact with the upper end portion of the mouth / neck portion 40, and thus the mouth / neck portion 4
0 is sealed. Thus, when the container lid 2 is moved downward to the state shown in FIG. 3, the locking means 3 formed on the inner surface of the tamper-evidence skirt 16 is formed.
8 is a locking jaw portion 4 formed on the outer peripheral surface of the mouth / neck portion 40.
It is necessary to pass through 4 and in this case 2 in FIG.
As shown by the dotted line, the locking means 38 is elastically deformed or displaced outward in the radial direction with the lower end thereof as the fulcrum of rotation, and the movable support portion 28 is elastically outwardly in the radial direction with its lower end as the fulcrum of rotation. Be deformed or displaced. Thus, not only the locking means 38 but also the movable support portion 28 to which the base of the locking means 38 is connected can be elastically deformed or displaced, so that the locking means 38 can easily lock the locking jaw portion 44. The closing rotation torque that can be passed through and therefore applied to the container lid 2 may be relatively small,
It is possible to surely prevent the bridging portion 20 in the circumferential weakening line 12 formed in the skirt wall 6 from being broken when the container lid 2 is attached to 0. When the locking means 38 passes through the locking jaw portion 44, the locking means 38 and the movable support portion 28 elastically restore, and the locking means 38 locks on the lower surface of the locking jaw portion 44.

When opening the mouth-neck portion 40 of the container, the container lid 2 is rotated in the opening rotation direction (counterclockwise direction when viewed from above in FIG. 3). In this way, the female thread 24 formed on the container lid is connected to the male thread 4 formed on the mouth / neck portion 40.
Since it is moved along 2, the container lid 2 is moved upward with rotation. However, the locking means 38 formed on the inner surface of the tamper-evidence skirt 16
Is locked to the lower surface of the locking jaw portion 44 of the mouth / neck portion 40, the upward movement of the tamper-evident hem portion 16 is prevented, and thus the circumferential weakening line 12 formed on the skirt wall 6 is prevented. Substantial stress is generated in the bridging portion 20 at, which breaks the bridging portion 20 and separates the tamper-evidence skirt 16 from the main portion 14. Restraint surface 36
Since the movable support portion 28 is prevented from moving inward in the radial direction by the cooperation between the restraint surface 32 and the constrained surface 32, the locking means 38 is provided.
At the same time, the movable support portion 28 is elastically deformed or displaced inward in the radial direction, and the locking means 3 for the locking jaw portion 44 is provided.
There is no possibility that the locking of the locking means 8 will be damaged, and the locking action of the locking means 38 with respect to the locking jaw portion 44 is maintained sufficiently reliably, and therefore the circumferential weakening line 12 formed in the skirt wall 6
The bridging portion 20 is easily and surely broken as required. After that, the tamper-evidence hem portion 16 is left in the mouth / neck portion 40, and the other portion of the container lid 2 is moved upward with the rotation and separated from the mouth / neck portion 40.
Thus, the mouth / neck portion 40 is opened.

FIG. 4 illustrates a modification of the container lid constructed in accordance with the present invention. In this modification, each of the openings 126 formed in the tamper-evident skirt 116 extends to the upper end of the tamper-evident skirt 116 and is continuous with the slit 118 in the circumferential break line 112. . A guide surface 134 and a restraining surface 136 are formed on the lower end of the main portion 114 of the skirt wall 106 that defines the upper end of the slit 118. When the movable supporting portion 128 is bent inward, the constrained surface 132 formed at the upper end of the movable supporting portion 128 passes through the guide surface 134 and faces the constraining surface 136 and is positioned outside thereof. Other configurations of the container lid shown in FIG. 4 may be substantially the same as the container lid 2 shown in FIGS. 1 to 3.

FIG. 5 illustrates yet another modification of the container lid constructed in accordance with the present invention. In this modification, the opening 226 formed in the tamper-evidence skirt 216 extends to the lower end of the tamper-evidence skirt 216 and is opened downward. The movable support portion 228 is connected to the main body portion of the tamper-evidence skirt portion 216 via the connecting pieces 230 on both sides in the circumferential direction at the lower end thereof. Movable support portion 228 and locking means 2 formed to extend downward from the lower end of the tamper-evident hem portion 216.
When 38 is bent inward, a twist is applied to the connecting piece 230 having a relatively small cross-sectional area. Other configurations of the container lid illustrated in FIG. 5 may be substantially the same as the container lid 2 illustrated in FIGS. 1 to 3.

In the above-described embodiment, when the mouth / neck portion is opened, all the bridging portions in the circumferential break line formed on the skirt wall are broken, and the tamper-evidence hem portion becomes the skirt wall. Separated from the main portion, if desired, one or more axial weakening lines may be formed in the tamper evidence skirt and one or more bridging portions in the circumferential weakening line may be It is made stronger than the bridging part, and when opening the mouth and neck part, the axial weakening line is broken and the tamper-evident hem part is expanded from the endless ring shape to the band shape and the locking means for the locking jaw part. The locking action of the is released, the strong bridging part in the circumferential weakening line is maintained without breaking, and thus the tamper-evidence hem part is also left without leaving from the mouth and neck part. It is also possible. Further, the locking means in the above-described embodiment has a form extending radially inward from the inner surface of the movable support portion, but the locking means is not limited to such a form, and the movable support is not limited thereto. It is also possible to form locking means such as a shape that extends radially inward from the inner surface of the portion toward one side in the circumferential direction, or a projection shape that projects radially from the inner surface of the movable support portion.

[0022]

In the container lid of the present invention, it is ensured that the circumferential weakening line is not broken when the container lid is attached to the mouth and neck of the container, and the mouth and neck of the container is opened. In doing so, the circumferential weakening line is easily and reliably ruptured as required.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a preferred embodiment of a container lid constructed in accordance with the present invention.

2 is a side view showing a part of the container lid shown in FIG. 1 in section.

FIG. 3 is a side view showing a state in which the container lid illustrated in FIGS. 1 and 2 is attached to the mouth and neck of the container, a part of which is shown in section.

FIG. 4 is a partial perspective view showing a modified example of the container lid configured according to the present invention.

FIG. 5 is a partial perspective view showing another modified example of the container lid configured according to the present invention.

[Explanation of symbols]

 2: Container lid 4: Top wall 6: Skirt wall 12: Circumferential weakening line 14: Main part of skirt wall 16: Tamper evidence hem 18: Slit 20: Bridge portion 24: Female thread 26: Opening 28: Movable support part 30: Thin extension part 32: Restrained surface 34: Guide surface 36: Restraint surface 38: Locking means 40: Mouth and neck part 42: Male thread 44: Locking jaw part 106: Skirt wall 114: Skirt Main part 112 of wall: Circumferential break line 116: Tamper-evidence skirt 118: Slit 126: Opening 128: Movable support 132: Restrained surface 134: Guide surface 136: Restraint surface 216: Tamper-evidence skirt 226: Opening 228: Movable support 230: Connection piece 238: Locking means

Claims (7)

[Claims] 1. A top surface wall and a cylindrical skirt wall depending from the top surface wall, wherein a circumferential weakening line extending in a circumferential direction is formed on the skirt wall, and the skirt wall is It is divided into a main part above the circumferential weakening line and a tamper-evidence skirt below the circumferential weakening line, and a female thread is formed on the inner surface of the main part of the skirt wall. In a synthetic resin container lid in which a plurality of locking means projecting inward in the radial direction are arranged at intervals in the circumferential direction on the tamper-evidence skirt, the tamper-evident skirt has a circumference. A plurality of openings are formed at intervals in the direction, and each of the openings is provided with a movable support portion that is movable outward in the radial direction but is prevented from moving inward in the radial direction. And the locking means is formed on the inner surface of the movable support portion. , Plastic container closure, characterized in that. 2. The opening has a rectangular shape, and a lower end of the movable support portion is connected to the tamper-evidence skirt portion, and the movable support portion is pivotable radially outward with the lower end as a pivot fulcrum. Item 1. A synthetic resin container lid according to item 1. 3. The circumferential weakening line includes a plurality of slits extending in the circumferential direction at intervals in the circumferential direction, and the opening extends to the upper end of the tamper-evidence skirt and is continuous with the slits. The synthetic resin container lid according to claim 2. 4. The opening extends downward to the lower end of the tamper-evidence skirt and is opened downward, and the movable support is connected to the tamper-evident skirt on both sides in the circumferential direction at the lower end. And is rotatable outward in the radial direction with both ends in the circumferential direction at the lower end being pivotal fulcrums.
The synthetic resin container lid described. 5. The synthetic resin container lid according to any one of claims 2 to 4, wherein the locking means extends from the inner surface of the movable support portion upward in a radially inclining manner. . 6. A constrained surface is formed at an upper end of the movable support portion so as to extend upward in a radial direction outward, and the skirt wall is inclined upward in a radial direction outward. An extending constraining surface is formed, and the constraining surface is positioned inside the constrained surface in the radial direction to allow the constrained surface to move radially outward, but prevent it from moving radially inward. The synthetic resin container lid according to any one of claims 2 to 5. 7. The movable support portion and the locking means are formed so as to extend downward from the tamper evidence hem portion,
The synthetic resin container lid according to claim 2, which is formed by folding back inside.