JPS6111357A - Vessel cover having pilfer-proof characteristic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

<Prior Art> As is well known to those skilled in the art, containers such as bottles for food and beverages generally have a male thread formed on the outer peripheral surface and a locking jaw located below the male thread. A container with a wide opening and neck is used. As container lids for such containers, container lids having pilfer-proof properties (properties to prevent tampering such as refilling of contents) are widely used in practical use.

Such a container lid includes a top wall and a cylindrical skirt wall depending from the periphery of the top wall. On the skirt wall,
A circumferential weakened line is formed that includes a plurality of slits arranged at intervals in the circumferential direction and a plurality of bridge sections located between the slits, and the skirt wall is formed along the circumferential weakened line. It is divided into a main part above the line and a pilfer-proof hem part below the circumferential weakening line. The inner surface of the main portion of the skirt wall is formed with a female thread that cooperates with the female thread formed on the neck and neck of the container. The pilfer-proof hem of the skirt wall is latched to the latching jaw formed on the opening of the container.

Therefore, the conventional container lid having the above-mentioned opening has the following opening problem to be solved.

That is, when a container lid is attached to the mouth and neck of a container to seal the mouth and neck, stress is generally generated in the plurality of bridges, but the plurality of bridges are broken. It is important that this is maintained.

On the other hand, when the container lid is removed from the neck of the container with or without its pilfer-proof hem remaining and the neck is opened, at least most of the plurality of bridges are It is important that it can be easily broken. Otherwise, opening the mouth and neck can be quite difficult, especially for children and women. However, conventional container lids cannot fully satisfy the above two requirements, and at least a portion of the plurality of bridging portions are broken when the container lid is attached to the mouth and neck. In addition, it was often quite difficult for children and women to open the mouth and neck.

<Object of the Invention> The present invention was made in view of the above circumstances, and its main purpose is to provide a new and improved container lid that can fully and reliably satisfy the above two requirements. That's true.

<Summary of the Invention> As a result of intensive study, the present inventors L have made the form of the plurality of slits and bridge parts completely different from the conventional form,
At least most of the circumferential ends of the plurality of slits extend downwardly in the direction of opening rotation of the container lid when opening the neck part, and If at least most of the slits are defined between the inclined ends of adjacent slits and are made to extend downwardly in the direction of opening and rotation, when the container lid is attached to the mouth and neck, The plurality of bridges can be maintained sufficiently reliably without being broken, and at least a majority of the plurality of bridges can be broken easily enough when the mouth and neck are opened. It has been found that the above two requirements can be satisfied with sufficient certainty.

In other words, according to the present invention, a pilfer-proof characteristic is achieved for a container having a neck portion in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface. A container lid comprising a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, the skirt wall having a plurality of slits arranged at intervals in the circumferential direction, and a plurality of slits between the slits. A circumferential weakened line is formed with a plurality of bridging portions located at the circumferential weakened line, and the skirt wall includes a main portion above the circumferential weakened line and a pilfer-proof hem portion below the circumferential weakened line. The inner surface of the main part is formed with a female thread that cooperates with the male thread of the mouth and neck part, and the pilfer-proof hem part is divided into the locking jaw part of the mouth and neck part. In a container lid that is locked to a container lid; at least most of the plurality of slits have circumferentially opposite end portions that extend downwardly in a direction in which the container lid is opened and rotated when the mouth and neck are opened. and at least most of the plurality of bridge portions are defined between the inclined end portions of adjacent slits and extend downwardly in the opening rotation direction. A container lid is provided.

In a preferred embodiment of the invention, the bridging portion extending downwardly in the direction of unsealing rotation makes an angle α of 5 to 80 degrees, in particular 20 to 60 degrees, with respect to the central axis. Further, the width of the bridge portion gradually increases or decreases downward. both ends of the slit in the circumferential direction,
It extends upwardly in the opening rotational direction, and extends at an angle of 95 to 135 degrees, particularly 100 to 1 degrees, with respect to the central axis.
It forms an angle β of 20 degrees.

Preferred Embodiments of the Invention A preferred embodiment of the improved container closure according to the invention will now be described in more detail with reference to the accompanying drawings, in which: FIG.

Referring to FIG. 1, the illustrated container closure comprises a closure body, generally designated 2, which may be molded by compression or injection molding from any suitable synthetic resin material such as polyethylene or polypropylene. There is. This lid body 2
includes a circular top wall 4 and a cylindrical skirt wall 6 that hangs down from the periphery of the top wall 40.

An annular protrusion 8 is formed on the inner surface of the top wall 4, and a sealing liner 10 formed separately from the lid body 2 is disposed within the annular protrusion 8.

Such a sealing liner 10 can be formed directly at a desired position on the inner surface of the top wall 4 by a well-known embossing process after forming the lid body 2, or it can be formed into a predetermined shape completely separately from the lid body 2. It can be molded and then inserted into the inner surface of the top wall 4 of the lid body 2.

If desired, the sealing liner 10 can be formed integrally with the main body 2.

In the illustrated embodiment, the skirt wall 6 has a relatively thick upper portion 2, an intermediate portion 14 of intermediate thickness, and a relatively thin lower portion 16. A circumferential weakening line (the circumferential weakening line 18 will be explained in more detail later), which is indicated by the number 18 as a whole, is formed in the intermediate portion 14, and the skirt wall 6 has a circumferential weakening line. It is divided into a main portion 20 above the line 18 and a pilfer-proof hem 22 below the circumferential weakening line 18.

The outer surface of the main portion 20 (more specifically, the relatively thick upper portion 12) of the skirt wall 6 is formed with an uneven shape or a flattened shape 24 to prevent fingers placed thereon from slipping. A female thread 26 is formed. A locking means 28 is formed on the inner surface of the pilfer-proof hem 22 (more specifically, the relatively thin lower portion 16). The illustrated locking means 28 is comprised of a plurality of flap pieces that are circumferentially spaced apart and project radially inward from the inner surface of the pilfer-proof hem 22 . If desired, the locking means 28 may be formed of a plurality of protrusions spaced apart in the circumferential direction, or an annular protrusion extending continuously in the circumferential direction.

Referring to FIG. 2 together with FIG. 1, the circumferential weakening line 18 includes a plurality of slits 30 arranged at intervals in the circumferential direction, and a plurality of slits 30 located between the slits 30. The pilfer-proof hem portion 22 is connected to the main portion 20 by a plurality of bridging portions 32. The plurality of slits 30 can be formed at the same time when the lid body 2 is molded, or can be carved by an appropriate knife means after the lid body 2 is molded.

Thus, in the illustrated container lid improved according to the present invention, each of the slits 30 has a circumferentially intermediate portion 30!
L and both circumferential ends 30b and 30a. Both ends 30b and 30c in the circumferential direction of the slit 30 correspond to the opening rotational direction of the container lid when opening the mouth and neck, that is, the 21st
It extends downwardly in the direction shown by arrow 34. The angle α formed by both circumferential ends 30b and 30e of the slit 30 with respect to the central axis 36 (FIG. 1) is between 5 and 8.
Preferably it is 0 degrees, especially 20 to 60 degrees. On the other hand,
The circumferentially intermediate portion 30a of the ring 30 extends upwardly in the direction of the unsealing rotation, that is, in the direction indicated by the arrow 34 in FIG. Circumferential intermediate portion 301 of slit 30
The angle β that L makes with the central axis 36 (FIG. 1) is 9
Preferably it is between 5 and 135 degrees, especially between 100 and 120 degrees. Each of the bridge parts 32 has an adjacent slit 3
defined between both circumferential ends 30b and 30'c of 0,
Therefore, both circumferential ends 30b and 30C of the slit 30
Similarly, it extends downwardly in the unsealing rotation direction, that is, in the direction indicated by arrow 34 in FIG.

A container closure as described above is applied to a container provided with a neck 36, which is known per se, in the form as shown in FIG. A male thread 38 and a locking jaw portion +10 located below the male thread 38 are formed on the outer peripheral surface of the mouth and neck portion 36.

When the container lid is attached to the mouth and neck part 36 to close the mouth and neck part 36, the container lid is fitted onto the mouth and neck part 36 and the lid is moved in the closing direction, that is, in the third direction.
It is rotated clockwise when viewed from above in the figure, and is thus screwed into the female thread 26 of the container lid and the male thread 38 of the neck portion 36. In this way, the container lid is moved downward as it rotates, and at this time, the locking means 28 of the container lid is elastically displaced or deformed and passes over the locking jaw 4o of the neck portion 36. When the female thread 26 is fully screwed into the male thread 38, the locking means 28 completely passes through the locking barb 4° and is elastically restored as shown in FIG. , engages with the lower surface of the locking jaw portion 4o. Moreover, when the female thread 26 is fully screwed into the male thread 38, as shown in FIG.
The sealing liner 10 of the container lid is pressed against the top surface of the neck 36, thus ensuring that the neck 36 is sealed.

When the container lid is attached to the mouth and neck portion 36 of the container using the above-mentioned passage 9, the container lid is rotated in the direction shown by the arrow 42 in FIG. When the locking means 28 passes through the locking jaw 40, a force acts to prevent the locking means 28 from moving downward. Each bridging portion 32 of the directional line of weakening 18 is subjected to a force in the direction indicated by arrow 44 in FIG. However, as can be easily understood from the correlation between the direction of the force and the direction of inclination of the bridging part 32, the risk of the bridging part 32 being broken by the force is substantially avoided, and therefore, the opening of the container is When attaching the container lid to the neck 36, the bridging portion 32 is reliably maintained without being broken.

When opening the neck part 36, the seven container lids are rotated counterclockwise when viewed from above in FIG. 3, that is, in the unsealing rotation direction shown by the arrow 34 in FIG. In this way, the female thread 26 of the container lid is moved along the male thread 38 of the neck portion 36, so that the container lid is moved upward as it rotates. However, the pilfer-proof hem 22 cannot move upward because the locking means 28 formed on its inner surface engages with the lower surface of the locking jaw 40 of the neck and neck portion 36. Therefore, a force is applied to the bridging portion 32 of the circumferential weakened line 18, thereby causing the bridging portion 32 to break.

Therefore, when the bridging portion 32 breaks, the container lid is rotated in the unsealing rotation direction shown by the arrow 34 in FIG. 2 and moved upward, but the pilfer-proof hem 22 is 2, a force in the direction indicated by arrow 46 in FIG. 2 acts on each of the bridge sections 32.

As can be easily understood from the correlation between the direction of this force and the direction of inclination of the bridge section 32, the force acts effectively to break the bridge section 32, and therefore even children and women The bridge portion 32 can be broken easily enough.

When the bridging portion 32 is broken, the pilfer-proof hem portion 2
2 is separated, and therefore, the portion of the container lid other than the pilfer-proof hem 22 forms a ridge that freely moves upward as it rotates, and is thus separated from the neck and neck portion 36, allowing the lid to be opened. be done.

The birfer pull'-fu hem 22 is left in the neck and neck region 36.

Figures 4, 5 and 6 illustrate variations of container closures improved in accordance with the present invention.

In the modification shown in FIG. 4, the circumferential ends 30a and 30b of adjacent slits 300 are not parallel to each other, but are gradually spaced apart from each other in the downward direction. Direction both ends 30 &
and 36b, the width of the bridge portion 32 is gradually increased toward the bottom. In such a variation, when opening the container neck 36 (FIG. 3), the bridging portion 32 is broken at its narrowest upper end.

In the modified example shown in FIG. 5, contrary to the case shown in FIG. 4, the opening direction ends 30 & 30b of adjacent sulins 1, 10 are not parallel to each other but gradually approach downward. Therefore, the width of the bridging portion 32, which is used between the circumferential end portions 30 and 30b of adjacent slits 30, is gradually reduced in width toward the bottom. In such a variation, when opening the neck 36 (FIG. 3) of the container, the bridge 32 is broken at its narrowest lower end.

In the modification shown in FIG. 6, one circumferential end 30 & of a pair of adjacent slins 30 is omitted, and the other circumferential one end 30 b is omitted, thus making it possible to The bridge portion 32A is made into a reinforced bridge portion that is considerably wider than the other bridge portions 32. An axial weakening line 48 extending downward from the slit 30 is formed in the pilfer-proof hem 22 at one end in the circumferential direction of the reinforced bridging portion 32A. This axial weakening line 48 may be a so-called score, which is produced, for example, by reducing the material thickness. In order to generate the reinforced bridge portion 32A, instead of the above-described through-hole configuration, for example, one circumferential one end 301L and the other circumferential one end 30b are formed between a specific pair of adjacent slits 30. It is also possible to simply increase the spacing.

In the modification illustrated in FIG. 6, the neck 36 of the container
(FIG. 3) When opening the package, the reinforced bridging portion 32A is maintained without being broken, the axial weakening line 48 is broken, and the pilfer-proof hem 22 is opened in a band shape.
Thus, the pilfer-proof hem 22 is released from the locking jaw 40 of the mouth and neck 36. The pilfer-proof hem portion 22, which continues to be connected to the main portion 20 by the reinforced bridging portion 32A, is also removed from the mouth and neck portion 36 without remaining therein.

Several specific examples and modifications of the container lid improved according to the present invention have been described above with reference to the accompanying drawings.
The present invention is not limited to these specific examples or modifications, and various modifications or modifications can be made without departing from the scope of the present invention.

For example, in the specific example described above, the lid body 2 is made of a synthetic resin material, but in the present invention, the lid body 2 is made of a suitable metal thin plate such as an aluminum-based alloy thin plate or a chromic acid-treated steel thin plate. It can also be applied to container lids.

When the lid body is made of a thin metal plate, the container lid is fitted onto the neck of the container and then attached to the main part of the skirt wall along the male thread of the neck of the container, as is well known as the so-called roll-on method. A female thread is generated and the lower end of the pilfer-proof hem of the skirt wall is bent radially inward to engage the locking jaws of the neck, thus attaching the container lid to the neck. You can force it.

[Brief explanation of the drawing]

FIG. 1 is a side view, partially in section, of a specific example of a container lid improved according to the invention. FIG. 2 is a partial side view of a portion of the container lid of FIG. 1. FIG. 3 is a side view, partially in cross section, of the container lid shown in FIG. 1 attached to the mouth and neck of the container. FIG. 4, FIG. 5, and FIG. 6 are partial side views showing some modifications or modifications of the container lid improved according to the present invention. 2...Lid body 4...Top wall 6...Skirt wall 18...Circular weakening line 20...Main part of skirt wall 22...Pilfur-proof hem 26...Female thread Strip 28...Locking means 30...Slit 30a...Circumferential intermediate portions 30b and 30c of the slit...End portions 32 of the slit in the same direction...
・Bridge part 32A... Reinforced bridge part 36... Mouth and neck part 38... Female thread 40... Locking jaw part ridge 1

Claims (1)

[Scope of Claims] 1. For a container equipped with a neck portion in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface,
A container lid having pilfer-proof properties, comprising a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, the skirt wall having a plurality of tubes arranged at intervals in the circumferential direction. A circumferential weakening line is formed consisting of a slit and a plurality of bridges located between the slits,
The skirt wall is divided into a main part above the circumferential weakening line and a pilfer-proof hem below the circumferential weakening line, and the male thread of the neck part is formed on the inner surface of the main part. in the container lid, in which a female thread is formed that cooperates with the pilfer-proof hem, and the pilfer-proof hem is locked to the locking jaw of the neck part; in a circumferential direction of at least a majority of the plurality of slits; Both ends extend downwardly in the direction of opening rotation of the container lid when opening the mouth and neck, and at least most of the plurality of bridging parts are connected to the inclined ends of the adjacent slits. A container lid, characterized in that the container lid is defined between the container lid and extends downwardly in the opening rotation direction. 2. The container lid according to claim 1, wherein the bridging portion extending downwardly in the opening rotation direction forms an angle α of 5 to 80 degrees with respect to the central axis. 3. The container lid according to claim 2, wherein the angle α is 20 to 60 degrees. 4. The width of the bridging portion, which extends downwardly in the unsealing rotation direction, gradually increases in width;
A container lid according to any one of claims 1 to 3. 5. The width of the bridging portion, which extends downwardly in the unsealing rotation direction, gradually decreases in width;
A container lid according to any one of claims 1 to 3. 6. The container lid according to any one of claims 1 to 5, wherein the circumferentially intermediate portion of the slit extends upwardly in the opening rotation direction. 7. The container lid according to claim 6, wherein the circumferential intermediate portion of the slit forms an angle β of 95 to 135 degrees with respect to the central axis. 8. The container lid according to claim 7, wherein the angle β is 100 to 120 degrees. 9. One of the plurality of bridges is a reinforced bridge having relatively high strength, and the pilfer-proof hem has an axial weakening extending in the axial direction in association with the reinforced bridge. The container lid according to any one of claims 1 to 8, wherein a line is formed. 10. The container lid according to any one of claims 1 to 9, which is made of synthetic resin. 11. According to claim 10, the inner surface of the pilfer-proof hem is formed with locking means that protrudes radially inward and is locked to the locking jaws of the mouth and neck. container lid.