JPH0544297Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a container lid with pilfer-proof properties that is applied to containers such as beverage bottles.

<Prior art and its problems> As is well known, as a container lid applied to a container such as a beverage bottle, there is a type in which an endless ring-shaped pilfer-proof hem is expanded into an edged band shape when the container is opened. Container lids with pilfer-proof properties are widely used in practical use. Such a container lid has a top wall and a cylindrical skirt wall depending from the top wall, and the skirt wall is formed with a circumferential break line extending in the circumferential direction, and the skirt wall is formed along the circumferential break line. It is divided into a main part above the line and a pilfer-proof hem part below the circumferential break line. The above circumferential breaking line is
It is composed of a plurality of circumferential slits (kerfs) extending in the circumferential direction at intervals in the circumferential direction, and a plurality of bridge portions located between the slits. At least one of the plurality of bridging parts is a reinforced bridging part having a longer circumferential length than other normal bridging parts. The pilfer-proof hem of the skirt wall has at least one axial break line associated with the reinforced bridge.
Such an axial break line usually consists of a so-called score (a weakened line weakened by reducing the material thickness), and is formed in the direction of opening rotation (i.e. detachment of the container lid from the container neck). It extends downwardly from the front end of the slit, which is located immediately behind the reinforcing bridge (as viewed in the direction of rotation of the container lid).

Therefore, in the container lid of the above-mentioned form, (a) When the container lid is removed from the container mouth neck to open the container, the axial break line formed on the pilfer-proof hem is In addition to being reliably broken, the reinforced bridging portion is also reliably maintained without being broken, and thus the pilfer-proof hem formed on the main portion of the skirt wall via the reinforced bridging portion also connects to the container mouth neck. (b) In order to temporarily reseal the container by reattaching the container lid that has been removed from the container opening neck, the reinforced bridge portion must be broken and the pill removed. It is necessary that the fur-proof hem is separated from the main part of the skirt wall, so that once the container lid is removed from the container neck, the reinforced bridging portion can be broken easily enough. It is important that the following requirements are met.

However, with conventional container lids, it has been difficult to stably satisfy both of the above requirements (a) and (b).

In the container lid disclosed in Japanese Utility Model Publication No. 57-43798, which was previously proposed by the present applicant, in particular, in order to reliably satisfy the above requirement (b), the reinforced bridge part is It forms a score that extends. In such container lids, the above requirement (b) is fully and reliably satisfied, but the above requirement (a) is often not satisfied. That is, due to unavoidable manufacturing errors in score formation, the breaking strength of the reinforced bridging portion becomes too small, and the axial breaking line formed on the pilfer-proof hem is broken when the container is opened. It was not uncommon for the reinforced bridge portion to be broken due to being maintained without any damage.

On the other hand, similarly, the applicant proposed the Jikko 58
In the container lid disclosed in Publication No. 43568, in order to reliably satisfy the above requirement (a), the circumferential length of the score formed on the reinforced bridge portion is determined by the circumferential length of the reinforced bridge portion. The circumferential ends of the score are positioned on the inner side in the circumferential direction of the reinforcing bridging portion. In such a container lid, the above requirement (a) is fully and reliably satisfied, but
It was difficult to satisfy the above requirement (b). In other words, since score-free regions remain at both ends of the reinforced bridge in the circumferential direction, it is necessary to apply a considerably large force especially when the reinforced bridge begins to break, and the fracture of the reinforced bridge becomes difficult. It wasn't always easy.

<Problems with the invention> The present invention has been made in view of the above facts, and its technical problem is to improve the scores provided on the reinforced bridge sections to meet the requirements (a) and (b) above. The goal is to ensure that both are stable and fulfilled.

<Solution Means of the Invention> The solution means of the present invention is to make the front end of the score coincide with the front end of the reinforced bridge section when viewed in the opening rotation direction, and therefore create a score-free region at the front end of the reinforced bridge section. On the other hand, the rear end of the score is positioned ahead of the rear end of the reinforced bridge part by a predetermined dimension, so that a score non-existent region of a predetermined size remains at the rear end of the reinforced bridge part. That's true.

That is, according to the present invention, there is provided a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and a circumferential break line extending in the circumferential direction is formed on the skirt wall. The skirt wall is divided into a main portion above the circumferential break line and a pilfer-proof hem below the circumferential break line, and the circumferential break line is formed at intervals in the circumferential direction. It consists of a plurality of circumferential slits extending in the direction and a plurality of bridge parts located between the slits,
At least one of the plurality of bridging parts is a reinforced bridging part having a longer circumferential length than other normal bridging parts, and the pilfer-proof hem has a reinforced bridging part when viewed in the opening rotation direction. An axial break line is formed extending downward in the axial direction from a slit located immediately behind the reinforced bridge portion, and a score extending in the circumferential direction is disposed on the reinforced bridge portion. In a container lid having the following characteristics: The score disposed on the reinforcing bridge extends rearwardly from a front end that coincides with the front end of the reinforcing bridge when viewed in the opening rotation direction, and the score extends rearwardly from a front end that matches the front end of the reinforcing bridge, and is located forward of the rear end of the reinforced bridge portion by a predetermined dimension;
A container lid is provided.

The residual thickness of the score disposed in the reinforced bridge portion gradually increases from the front end to the rear end, and the residual thickness at the front end is 0.14 to 0.21 mm, particularly
Preferably, it is 0.16 to 0.19 mm. The rear end of the score is 0.5 to 1.5 mm lower than the rear end of the reinforced bridge,
In particular, it is preferable that it be positioned forward by 0.8 to 1.2 mm.

<Operation of the device> In the container lid of the present invention, when the container is opened, the score-free region left at the rear end of the reinforced bridge portion allows the axial direction of the region immediately behind the Force is effectively transmitted to the break line to ensure that the axial break line is broken, thus expanding the pilfer-proof hem from an endless ring shape to an end band shape, and breaking the reinforced bridge. will be maintained without fail. On the other hand, once the container lid is removed from the container mouth and neck, the reinforced bridge portion can be broken easily enough by starting from the front end where no score area remains. The pilfer-proof hem can be separated from the main part of the skirt.

<Preferred Specific Examples of the Invention> Hereinafter, preferred specific examples of the container lid constructed according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the illustrated container lid constructed in accordance with the present invention, designated generally by the numeral 2, comprises:
Body 4 which can be formed from a suitable sheet metal
Equipped with: A preferable example of the metal thin plate is an aluminum-based alloy thin plate having a thickness of 0.22 to 0.24 mm. The main body 4 has a circular top wall 6 and a cylindrical skirt 8 depending from the periphery of the top wall 6. Disposed on the inner surface of the top wall 6 is a synthetic resin liner 10, which may be of any suitable form and is well known per se. A circumferential breaking line 12 extending in the circumferential direction is formed at the lower part of the skirt wall 8.
Main portion 14 above 2 and circumferential breaking line 12
It is divided into a pilfer-proof hem 16 below the pilfer-proof hem 16. An anti-slip knurl 18 is formed at the upper end of the main portion 14. The main portion 14 is further formed with an annular groove 20 extending in the circumferential direction adjacent to and below the knurling 18.

The circumferential breaking line 12 includes a plurality of slits 22 extending in the circumferential direction at intervals in the circumferential direction;
It is composed of a plurality of bridge parts 24 located between the slits 22. To explain with reference to FIG. 2 as well as FIG. 1, one of the plurality of bridging portions 24 24a has a circumferential length considerably larger than other normal bridging portions 24. This is a reinforced bridge section. The circumferential length of such reinforced bridging portion 24a is advantageously between 2 and 10 mm, particularly between 3 and 5 mm. On the other hand, the circumferential length of the normal bridging portion 24 is preferably 0.6 to 1.0 mm, particularly approximately 0.8 mm. The circumferential length of the slit 22 is generally conveniently on the order of 8 to 10 mm. However, when viewed in the direction of open rotation shown by arrow 26 (in this specification, when "front" or "rear" is used without specific reference to direction, it means before or after in the direction of open rotation shown by arrow 26). do),
The circumferential length of the slit 22a located immediately behind the reinforcing bridging portion 24a is shortened compared to the other slits 22, and is advantageously between 0.5 and 8 mm, particularly between 1 and 5 mm. The pilfer-proof hem 16 is formed with an axial breaking line 28 that extends axially downward from the front end of the slit 22a to the lower end of the pilfer-proof hem 16. This axial break line 28
consists of scores formed by reducing material thickness. The material residual thickness of the score forming the axial break line 28 is:
Advantageously, it is between 0.06 and 0.15 mm, especially between 0.09 and 0.12 mm.

Continuing the explanation with reference to Figures 1 and 2,
The reinforced bridge portion 2 at the circumferential fracture line 12
A score 30 extending in the circumferential direction is formed on 4a. It is important that the front end 30F of the score 30, which is formed by reducing the material thickness, coincides with the front end 24aF of the reinforcing bridge 24a. On the other hand, the rear end 30R of the above score 30
It is important that the rear end 24aR of the reinforced bridging portion 24a is located forward of the rear end 24aR by a predetermined distance l. The above specified dimension l is 0.5 to 1.5 mm, especially 0.8 to 1.5 mm.
Preferably it is 1.2 mm. If the predetermined dimension l becomes too small, there is a risk that the reinforcing bridge portion 24a will be broken when the container is opened, as will be described later. There is a tendency that it becomes difficult to break the bridge portion 24a. As clearly illustrated in Figure 3,
It is preferable that the residual thickness of the score 30 is gradually increased from the front end 30F to the rear end 30R. The residual thickness t at the front end 30F of the score 30 is 0.14 to 0.21 mm, particularly 0.16 to 0.21 mm.
Preferably it is 0.19mm.

In the illustrated example, the reinforced bridge portion 24a is
However, if desired, two or more reinforced bridge portions 24a may be provided at appropriate intervals in the circumferential direction, and the axis of each of the reinforced bridge portions 24a may be It is also possible to provide a score 30 that extends in the circumferential direction together with the directional break line 28.

Referring to FIG. 4, the container lid 2 described above is applied to the mouth and neck portion 32 of a container, which may be made of glass or a suitable synthetic resin. The mouth and neck part 32, which itself may have a well-known shape, has a generally cylindrical shape, and has a male thread 34 and a locking jaw part 36 located below the male thread 34 on its outer peripheral surface. When the container lid 2 is attached and the container is sealed, the mouth and neck portion 32
The container lid 2 is fitted and pressed downward to bring the liner 10 of the container lid 2 into close contact with the top surface of the mouth and neck portion 32.
Then, while maintaining this state, the mouth and neck region 32
The main portion 14 of the skirt wall 6 of the main body 4 of the container lid 2 is deformed along the male thread 34 to form a female thread 38 that cooperates with the male thread 34. Then, the lower end of the pilfer-proof hem 16 is folded inward in the radial direction, and the locking jaw 3 of the mouth and neck part 32 is inserted.
6. Lock it to the bottom surface of 6. In the illustrated example, the boundary area between the top wall 6 and the skirt wall 8 in the main body 4 of the container lid 2 is further deformed inward in the radial direction.

When removing the container lid 2 from the mouth and neck part 32 to open the container, put your finger on the knurling 18 formed at the upper end of the skirt wall 8 and remove the container lid 2.
is rotated in the open rotation direction shown by arrow 26. In this way, due to the cooperative action of the male thread 34 and the female thread 38, the container lid 2 is moved upward in the axial direction as it rotates. However, since the lower end of the pilfer-proof hem 16 is locked by the locking jaw 36, upward movement in the axial direction is prevented. Thus, considerable stress is generated in the plurality of bridges 24 at the circumferential break line 12, and the bridges 24 are broken except for the reinforced bridge 24a. The reinforced bridging portion 24a is maintained without being broken, and the axial break line 28 in the pilfer-proof hem 16 is broken, and the pilfer-proof hem 16 is expanded from an endless annular shape to an edged band shape. Ru. In the container lid 2 constructed according to the present invention, a score-free region is left at the rear end of the reinforced bridging portion 24a, and the score-free region is passed through the pilfer-proof hem 16. The force in the opening rotation direction and the axially upward direction is sufficiently effectively transmitted to the front side of the axial break line 28, so that the axial break line 28 is sufficiently and reliably broken, and the reinforced bridge portion 24a is broken. is prevented with sufficient certainty. After the pilfer-proof hem 16 is developed into an edged band shape as described above, the entire container lid 2 is allowed to freely move upward in the axial direction as it rotates in the opening rotation direction, Thus, in the form shown in FIG.
The container is opened.

If it is desired to temporarily reseal the container by reattaching the container lid 2 to the mouth and neck portion 32, the reinforced bridging portion 24a is broken and the pilfer-proof hem portion 16 is removed.
to separate them. In the container lid 2 constructed according to the present invention, a score 30 extending rearward from the front end 24aF is formed on the reinforced bridge portion 24a. Therefore, the fracture of the reinforced bridge portion 24a is caused by
This can be accomplished easily enough by proceeding along the score 30 from its front end. Next, the container lid 2 from which the pilfer-proof hem 16 has been separated is fitted onto the mouth and neck part 32, and the female thread 38 is re-threaded to the male thread 34.

<Effect of the invention> As described above, with the container lid constructed according to the invention, when the container is opened, the axial break line formed at the hem of the pilfer-proof can be reliably maintained. At the same time as the reinforced bridge is broken, the reinforced bridge at the circumferential fracture line is reliably maintained without being broken, and after the entire container lid is once removed from the container mouth neck, the reinforced bridge can be easily removed. The pilfer-proof hem can be separated by breaking.

[Brief explanation of the drawing]

FIG. 1 is a side view, partially in cross section, of a specific example of a container lid constructed according to the present invention. 2 is a partial side view showing a part of the container lid of FIG. 1; FIG. FIG. 3 is a partial cross-sectional view showing the residual thickness of the score formed in the reinforced bridge portion of the container lid of FIG. 1. FIG. 4 is a side view, partially in cross section, of the container lid shown in FIG. 1 attached to the container mouth and neck. FIG. 5 is a side view showing the state after the container lid of FIG. 4 has been removed from the container neck. 2...Container lid, 4...Container lid body, 6...Top wall, 8...Skirt wall, 12...Circumferential break line, 14...Main part of skirt wall, 16...Pilfer proof hem , 22...slit, 24...
Bridge part, 24a... Reinforced bridge part, 24aF... Front end of reinforced bridge part, 24aR... Rear end of reinforced bridge part,
26... Open rotation direction, 28... Axial direction breaking line, 30... Score, 30F... Front end of score,
30R...Rear end of the score.

Claims (1)

[Claims for Utility Model Registration] 1. It has a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and the skirt wall has a circumferential breaking line extending in the circumferential direction,
The skirt wall is divided into a main portion above the circumferential break line and a pilfer-proof hem below the circumferential break line, and the circumferential break line is spaced apart in the circumferential direction. It consists of a plurality of circumferential slits extending in the circumferential direction and a plurality of bridge parts located between the slits, and at least one of the plurality of bridge parts is larger than other normal bridge parts. The reinforced bridging part has a large circumferential length, and the pilfer-proof hem has an axial break line extending downward in the axial direction from a slit located immediately behind the reinforced bridging part when viewed in the opening rotation direction. In a container lid having pilfer-proof properties, the reinforcing bridging portion is provided with a score extending in the circumferential direction;
When viewed in the opening rotation direction, the score extends rearward from a front end that coincides with the front end of the reinforced bridge portion, and the rear end of the score is located forward of the rear end of the reinforced bridge portion by a predetermined dimension. container lid. 2. The container lid according to claim 1, wherein the residual thickness of the score disposed on the reinforced bridge portion gradually increases from the front end to the rear end. 3. The container lid according to claim 2, wherein the score disposed on the reinforced bridge has a residual thickness of 0.14 to 0.21 mm at the front end. 4. The container lid according to claim 3, wherein the score disposed on the reinforced bridge has a residual thickness of 0.16 to 0.19 mm at the front end. 5. The rear end of the score disposed on the reinforced bridge section is 0.5 to 1.5 lower than the rear end of the reinforced bridge section.
Container lid according to any of claims 1 to 4, located forward by mm. 6 The rear end of the score disposed on the reinforced bridge section is 0.8 to 1.2 lower than the rear end of the reinforced bridge section.
6. Container lid according to claim 5, located forward by mm. 7 Claims 1 to 6 formed from an aluminum-based alloy thin plate having a thickness of 0.22 to 0.24 mm.
A container lid as described in any of the above.