JP2720185B2 - Metal container lid with pill fur proof characteristics - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal container lid having a pill fur proof characteristic, and more specifically, comprises a top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, The present invention relates to a metal container lid in which a weakening line comprising a plurality of circumferentially spaced slits and a plurality of bridging portions located between the slits is provided on a skirt wall. .

(Prior art)

BACKGROUND ART As a well-known container lid applied to a container such as a glass or synthetic resin bottle for a beverage or the like, a metal container lid having pill fur proof characteristics is widely used in practice.

The container lid formed from a metal sheet such as an aluminum-based alloy sheet, a chromic acid-treated steel sheet or a tin sheet,
It has a top wall and a tubular skirt wall hanging down from the periphery of the top wall. The skirt wall is provided with a circumferentially extending weakening line, and the skirt wall is divided into a main portion above the weakening line and a pill fur proof hem below the weakening line. The weakening line includes a plurality of circumferentially spaced slits extending in the circumferential direction and a plurality of bridging portions located between the slits. On the inner surface of the top wall, a sealing liner usually formed of an appropriate synthetic resin is provided.

The container lid is applied to a container in which an external thread and a locking jaw located below the external thread are formed on the outer peripheral surface of the mouth and neck. When a container lid is attached to the mouth and neck of the container to seal the mouth and neck, the container lid is fitted to the mouth and neck, and a pressing force is applied to the outer surface of the top wall of the container lid to open the sealed liner. Close the upper end of the neck. While maintaining such a state, a female thread is formed on the main part of the skirt wall of the container lid along the male thread of the mouth and neck, and the lower end of the skirt wall of the container lid, that is, a pill fur proof hem. The lower end of the part is bent inward and locked to the locking jaw at the mouth and neck. When opening the mouth and neck of the container, the container lid is rotated in the opening direction. Thus, the female thread of the container lid moves along the male thread of the mouth and neck, and thus the container lid is raised with respect to the mouth and neck. However, since the pill fur proof hem of the container lid is locked by the locking jaw of the mouth and neck, the rise is prevented, and thus a considerably large stress is generated in the weakening line, more specifically, the bridge portion thereof, At least a majority of the plurality of bridges are broken (in some forms of container lids, all bridges are broken and the pill fur proof hem is completely separated from the main portion of the skirt wall). In other forms of container lids, there may be one or several wide bridges having a relatively large circumferential width, the normal bridges other than such wide bridges being broken, and A rupture line extending in the axial direction is formed in the pill fur proof hem, and the rupture line is broken to open the pill fur proof hem from an endless annular shape to an end band. Thereafter, the container lid is removed from the mouth and neck of the container, leaving the pill fur proof hem at the mouth and neck, or including the pill fur proof hem, and the mouth and neck are opened.

[Problems of the prior art]

However, in the conventional container lid of the above-described form, when the bridging portion is broken when opening the mouth and neck of the container, a sharp broken residual portion projecting downward from the main portion of the container lid is generated. There is a problem to be solved. If the consumer's finger accidentally touches the sharply broken residue after opening, the risk of damage is not small.

[Object of the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a main object of the present invention is to improve such that the generation of the above-mentioned sharp residual fracture due to the fracture of a bridge portion can be substantially avoided.

[Solution of the Invention]

As a result of earnest research and experiments, the present inventors have found that when the bridge is bent along the upper edge along the upper edge, a break in the bridge is generated along the upper edge, and thus the container It has been found that the formation of a sharp break residue projecting downward from the main part of the lid can be substantially avoided.

That is, according to the present invention, the skirt includes a top wall and a tubular skirt wall hanging down from a periphery of the top wall, and the skirt wall is provided with a weakening line extending in a circumferential direction, The wall is divided into a main portion above the weakening line and a pill fur proof hem below the weakening line,
A metal container lid having a pill fur proof characteristic, wherein the weakening line includes a plurality of slits extending circumferentially at intervals in a circumferential direction and a plurality of bridging portions located between the slits; At least the majority of the bridges are bent along their upper edges to cause breaks along their upper edges. A container lid is provided.

By bending, 120 degrees to 170 degrees, especially
Preferably, the bridging sections are bent along their upper edges at a bending angle α of 130 to 160 degrees. If the bending angle α is excessively small, in other words, if the degree of bending performed is too large, the strength of the bridging part becomes too small, and when the container lid is attached to the mouth and neck of the container. In this case, the bridging portion tends to be broken. When the bending angle α is excessively large, in other words, when the degree of bending performed is too small, the breakage of the bridge portion is not generated sufficiently reliably along the upper edge.

In a container lid in a form in which a plurality of bridging portions include a wide bridging portion having a relatively large circumferential width, the bending process is not performed on such a wide bridging portion, and the wide bridging portion is formed. It is desirable to completely avoid the reduction in strength.

Incidentally, the present inventors initially performed various experiments by forming a so-called score generated by reducing the material thickness by a considerable amount instead of performing bending on the bridge portion. In this case, the strength of the bridging portion was significantly reduced, and the tendency of the bridging portion to break when the container lid was attached to the mouth and neck of the container was extremely large.

(Preferred specific examples)

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of a container lid constructed according to the present invention.

Referring to FIG. 1, the illustrated container lid 2, which can be formed from any suitable metal sheet, such as an aluminum-based alloy sheet or a chromic acid-treated steel sheet, has a circular top wall 4
And a cylindrical skirt wall 6 hanging from the periphery of the top wall 4
And At the lower part of the skirt wall 6 there is an annular portion 8 which is slightly bulged in the radial direction, on which a weakening line 10 extending in the circumferential direction is formed. The weakening line 10 divides the skirt wall 6 into a main part 12 above and a pill fur proof hem 14 below. The weakening line 10 includes a plurality of slits 16 extending in the circumferential direction at intervals in the circumferential direction, and a plurality of bridging portions 18 located between the slits 16. A specific one of the plurality of bridging portions 18 is a wide bridging portion 18a having a larger circumferential width than the other bridging portions 18. At the upper end of the main portion 12 of the skirt wall 6, an uneven portion 20 for preventing slippage is formed. Also,
An annular groove 22 is formed below the uneven portion 20. In the pill fur proof hem 14 of the skirt wall 6,
Pill fur proof hem 1 from one end of the wide bridge junction 18a
An axial breaking line 24 extending downward to the lower end of 4 is formed. This break line 24 may be a so-called score formed by reducing the material thickness. A sealing liner 26 that can be molded from a suitable synthetic resin is provided on the inner surface of the top wall 4. The sealing liner 26 has a disk shape as a whole, and has
An annular seal 28 having a concentric sealing ridge of the strip is formed.

Thus, the above-described configuration of the illustrated container lid 2 is already well known and does not constitute a new feature improved in accordance with the present invention, and therefore, a detailed description of such configuration will be omitted.

Referring to FIGS. 2 to 4 together with FIG. 1, the annular bulging portion 8 is cut at the slit 16 in the weakening line 10 as shown in FIG. The slit 16 is generated by such a cutting process. On the other hand, in the portion of the bridging portion 18 (excluding the wide bridging portion 18a) in the weakened line 10, no processing was conventionally performed as shown by a two-dot chain line in FIG. It is important that a bend is formed along the upper edge 30 of the bridging portion 18 at the bending angle α along the upper edge 30 of the bridging portion 18. The bending angle α is preferably from 120 to 170 degrees, particularly preferably from 130 to 160 degrees. If the bending angle α is too small, in other words, if the degree of bending is too large, the strength of the bridging portion 18 will be too small. Conversely, when the bending angle α is excessively large, in other words, when the degree of bending is too small, the intended purpose of breaking the bridge portion 18 along the upper edge thereof is sufficiently achieved. Can not do. On the other hand, the wide bridging portion 18a
As shown in FIG. 4, it is preferable that the portion is left as it is, as in the conventional case, without bending.

The bending is performed, for example, by adding a processing tool for bending to the rotary processing apparatus disclosed in Japanese Patent Publication No. 58-1520 and processing the slit 14 by cutting or simultaneously with or after this. Can be accomplished.

The container lid 2 constructed according to the present invention is applied to the mouth and neck of the container as shown in FIG. The mouth and neck portion 32 of the container which may be made of glass or a suitable synthetic resin has a substantially cylindrical shape, and has a male thread 34 and a locking jaw 36 located below the male thread 34 formed on the outer peripheral surface thereof. I have. In order to seal the mouth and neck 32 by attaching the container lid 2 to the mouth and neck 32, the container lid 2 is fitted over the mouth and neck 32 and the top of the container lid 2 is sealed in the same manner as in the case of the conventional container lid. A pressing force is applied to the outer surface of the face wall 4 so that the outer surface of the face liner 4 is brought into close contact with the upper end of the mouth-neck portion 32 of the annular sealing portion 28 of the sealing liner 26. Then, while maintaining such a state, the female thread is formed along the male thread 34 of the mouth and neck portion 32 in the main portion 12 of the skirt wall 6 of the container lid 2, more specifically, in a region below the annular groove portion 22. Form 38. In addition, the lower end portion of the pill fur proof hem portion 14 is bent inward in the radial direction so as to be locked on the locking jaw 36 of the mouth and neck portion 32.

In order to open the mouth and neck 32 of the container, the container lid 2 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. Thus, the container lid 2 is raised with the rotation by the cooperation of the male thread 34 and the female thread 38. Anyway,
The pill fur proof hem 14 cannot be lifted freely because its lower end portion is locked by the locking jaw 36, and thus is considerably large in the circumferentially extending weakening line 10 and the axial breaking line 24. Stress is generated. The breaking line 24 is broken by the stress together with the bridging portion 18 except for the wide bridging portion 18a in the weakened line 10, and as shown in FIG. 6, the endless annular pill fur proof hem portion 14 is formed into an end band. be opened. Thereafter, the entire container lid 2 is freely lifted with rotation, and is detached from the mouth / neck portion 32, and thus the mouth / neck portion 32 is opened.

Thus, in the conventional container lid, when the mouth and neck are opened, the bridging portion in the weakened line is broken into an unspecified form at an unspecified portion, and as shown in FIG. Sharp break residue 40 projecting downward from the main part of the skirt wall after
Could not be avoided. When a consumer's finger or the like comes into contact with the sharp remaining rupture portion 40, there is a high possibility that the user may be damaged.

In the container lid 2 constructed according to the invention, the bridging parts 18 to be broken upon opening of the mouth and neck part 32 are bent along their upper edges 30 and therefore ,
As shown in FIG. 8 along with FIG. 6, the bridges 18 are broken straight along their upper edges 30 and the skirt wall 6
The generation of the remaining fracture portion 40 projecting downward from the main portion 12 of the first portion is sufficiently reliably avoided.

[Effects of the Invention] As described above, according to the present invention, the bridging portions are broken in a straight line along their upper edges, and
The generation of a sharp rupture residue projecting downward from the main portion of the skirt wall due to the rupture of the bridge portion is sufficiently reliably avoided, and the consumer is prevented from being injured by a finger or the like.

[Brief description of the drawings]

FIG. 1 is a side view, partially in section, of a preferred embodiment of a container lid constructed in accordance with the present invention. FIG. 2, FIG. 3 and FIG. 4 are respectively lines II-I of FIG.
Sectional drawing in I, III-III and IV-IV. FIG. 5 is a side view partially showing a cross section of a state in which the container lid of FIG. 1 is applied to the mouth and neck of the container to seal the mouth and neck. FIG. 6 is a side view showing a state where the container lid of FIG. 5 has been detached from the mouth and neck of the container. 7 and 8 are partial side views showing a broken state of a bridging part in the conventional container lid and a broken state of the bridging part in the container lid of FIGS. 1 to 6, respectively. 2 ・ ・ ・ Container lid 4 ・ ・ ・ Top wall 6 ・ ・ ・ Skirt wall 10 ・ ・ ・ Weak line 12 ・ ・ ・ Skirt wall main part 14 ・ ・ ・ Pilfer proof hem 16 ・ ・ ・ Slit 18 ・ ・ ・Bridge 18a ... Broad bridge 24 ... Axial breaking line 26 ... Liner for sealing 30 ... Top edge of bridge 32 ... Neck and neck of container 40 ... Sharp Remaining fracture (conventional technology)

Claims (4)

(57) [Claims] 1. A top surface wall and a cylindrical skirt wall hanging from a periphery of the top surface wall, wherein the skirt wall is provided with a weakening line extending in a circumferential direction, and the skirt wall is provided with a skirt wall. It is divided into a main portion above the weakening line and a pill fur proof hem below the weakening line, and the weakening line is provided between the plurality of slits extending circumferentially at intervals in the circumferential direction. A metal container lid having a pill fur proof characteristic, comprising a plurality of bridge portions located at least a majority of the plurality of bridge portions are provided along their upper edges. A container lid, which is bent along its upper edge to cause breakage. 2. The method according to claim 1, wherein at least a majority of the plurality of bridges are bent at their upper edges at a bending angle α of 120 to 170 degrees. Container lid as described. 3. The container lid according to claim 2, wherein the bending angle α is 130 degrees to 160 degrees. 4. At least one of the plurality of bridge portions is a wide bridge portion having a relatively large circumferential width, and the wide bridge portion is not subjected to the bending process. Item 4. A container lid according to any one of Items 1 to 3.