JPS61104959A - Vessel cover made of synthetic resin 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 made of synthetic resin having pilfer-proof properties, and more specifically, a container lid made of a synthetic resin having a pilfer-proof property, and more specifically, a male screw thread on the outer circumferential surface and a locking element arranged below the male thread. The present invention relates to a container lid made of synthetic resin and having pilfer-proof properties, which is applied to a container having a mouth and neck portion formed with a jaw portion.

<Prior art> Recently, synthetic resin container lids have been proposed and put into practical use as pilfer-proof container lids for containers such as beverage bottles in place of Kincho container lids. It has become. Typical examples of such synthetic crude oil container lids include JP-A-56-74445 and JP-A-58.
Container lids disclosed in Japanese Patent Application Laid-Open No. 58-51116 and Japanese Patent Application Laid-Open No. 58-51116 can be mentioned.

The container lid disclosed in the above publication includes a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall. A weakened line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is divided into a main portion above the weakened line and a pilfer-proof hem portion below the weakened line. A male thread is formed on the inner surface of the pilfer-proof hem, and a plurality of locking flap pieces protruding radially inward are formed at intervals in the circumferential direction on the inner surface of the pilfer-proof hem. .

The synthetic resin container lid as described above is applied to 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. When closing the mouth and neck of a container with a container lid, the container lid is fitted onto the mouth and neck and rotated in the closing direction, that is, the closing direction, and the male threads of the container lid are connected to the male threads of the mouth and neck. Screw it together. As a result, the container lid rotates in the closing direction relative to the mouth and neck and moves downward in the shaft binding direction. At this time, 1. The locking flap pieces formed on the inner surface of the pilfer-proof hem are interfered with by the locking jaws formed on the outer surface of the mouth and neck, and are elastically bent outward in the radial direction. It will be done. When it is set and completely passes through the locking throat, it is elastically restored radially inward and locked to the lower surface of the locking jaw. When opening the neck of the container, the container lid is rotated in the opposite direction to the closing direction, that is, in the opening direction. In this way, since the female thread of the container lid is moved along the male thread of the mouth and neck, the one container lid rotates in the opening direction and moves upward in the axial direction.

However, the pilfer-proof hem of the container lid cannot move upward in the axial direction because the locking flap piece formed on its inner surface engages with the lower surface of the locking jaw of the mouth and neck. This creates considerable stress in the line of weakness formed in the skirt wall of the container lid. In this way, the weakened line is completely broken and the skirt wall is separated into the main part and the pilfer-proof hem, or the weakened line is broken leaving only a part and is attached to the pilfer-proof hem. The line of weakness extending in the axial direction is broken, and the pilfer-proof hem is opened from a blank ring shape to an end band shape. In such cases, other parts of the container lid may be opened, leaving behind the separated pilfer-proof hem, or the entire container lid, including the pilfer-proof hem, may be separated from the opening neck to open the opening. Ru.

Therefore, in the above-mentioned open container lid, it is M-pseudo that the following two requirements are satisfied. In order to block the mouth and neck of the first K1 container with the container lid, the locking flap piece can be elastically deflected radially outward with sufficient ease to pass through the locking rear; Therefore, it is essential to be able to attach the container lid to the mouth and neck with a relatively small rotational torque, thus reliably avoiding generating excessive stress on the line of weakness and causing it to break. be. Second, when opening the mouth and neck of the container, the locking flap pieces are sufficiently securely locked into the locking jaws, and thus the so-called "snap" is removed without causing the intended breakage of the weakened line. This causes the container lid to separate from the mouth and neck (this causes the pilfer-proof property to be damaged). ) is the best way to avoid this.

In order to satisfy these two requirements, the required downward rotational torque that must be applied to the container lid when the locking flap piece is forced to pass through the locking jaw from axially upward to downward is sufficiently small; The necessary upward rotational torque that must be applied to the container lid when the locking flap piece is to be passed axially from below to above through the locking jaw is sufficiently large and the weakening line is ruptured in the desired manner. Therefore, it is necessary to set the necessary breaking rotational torque that must be applied to the container lid between the above-mentioned required downward rotational torque and the above-mentioned necessary upward rotational torque.

However, in conventional container lids, it is not possible to create a sufficient difference between the above-mentioned required downward rotational torque and the above-mentioned necessary upward rotational torque, and therefore, due to manufacturing errors etc., the above-mentioned first requirement is not met. Or, the second requirement above was often not met.

<Object of the Invention> The present invention has been made in view of the above facts, and its main purpose is to sufficiently reduce the above-mentioned required downward rotational torque and sufficiently increase the above-mentioned necessary upward rotational torque, so that both An object of the present invention is to provide a synthetic resin container lid having a pilfer-proof property, which is improved so that the first and second requirements can be reliably satisfied.

<Summary of the Invention> As a result of intensive studies and experiments, the present inventors have found that each of the locking flap pieces in a conventional container lid is designed to prevent the rotation of the container lid when the container lid is attached to the mouth and neck. The locking flap pieces were extended in a straight line from the inner surface of the pilfer-proof hem at an angle opposite to the direction of the pilfer-proof hem. a first portion extending from the top, and inclined with respect to the first portion in a direction of closing rotation of the container lid when the container lid is attached to the mouth and neck;
By having a second portion further extending from the tip of the first portion, it is possible to suppress the increase in the above-mentioned necessary downward rotational torque and to considerably increase the above-mentioned necessary downward rotational torque. It has been found that the above object can be achieved, that is, according to the present invention, a mouth and neck part having a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface. A synthetic resin container lid having pilfer-proof properties for a container reservoir, comprising: a top wall;
The skirt wall is provided with a ↑ 1-shaped skirt wall that hangs down from the periphery of the top wall, and a weakened line extending in the circumferential direction is formed on the skirt wall. and a pilfer-proof hem below the weakened line, and a female thread is formed on the inner surface of the main part to be screwed into the male thread of the mouth and neck. A container lid in which a plurality of locking flap pieces protruding radially inward are formed on the inner surface of the Hill 7 ear-proof hem at regular intervals in the circumferential direction; a first portion extending from the inner surface of the pilfer-proof hem; and a second portion further extending from the tip of the portion.

<Preferred Embodiments of the Invention> -i- Hereinafter, preferred embodiments of the improved synthetic resin container lid according to the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIG. 1, the container lid, generally designated by the number 2, is integrally formed and includes a circular top wall 4 and a cylindrical skirt wall 6 hanging from the same axis of the top wall 4. It has a polished body. Such a body can be formed by compression molding or injection molding IC from a suitable synthetic resin material such as polyolefin resin.

In the illustrated example, an annular protrusion 8 is formed at the upper end of the inner surface of the skirt wall 6 and projects radially inward therefrom, and the annular protrusion 8 and the inner surface of the top wall 4 are connected to each other. A circular sealing liner 10, which is formed separately from the main body, is disposed within the area delimited by. Such a sealing liner 10 can be formed, for example, from a suitable synthetic resin material at the required position P5'r by a well-known embossing method after the main body has been formed. If desired, the sealing liner 10 can be formed separately from the main body (1!11) instead of forming an IC on the inner surface of the top wall 4 or on the skirt wall 6.
It is also possible to integrally form a sealing protrusion of an appropriate form on the upper end of the inner surface.

The skirt wall 6 includes a relatively thick upper portion 12, a relatively thin lower portion 14, and an intermediate portion 16 of intermediate thickness located between the two.
Contains. A weakened line 18 extending in the circumferential direction is formed in the intermediate portion 16, and the skirt wall 6 has a main portion 20 above the weakened line 18 and a pilfer-proof hem 22 below the weakened line 18. It is divided into. The weakened line 18 may be a so-called P1r score formed by reducing the thickness of the material, but in the illustrated example, the weakened line 18 is formed by planing at intervals in the circumferential direction and is formed by a plurality of slits (cuts) extending in the circumferential direction. A plurality of bridge portions 26 remaining between the grooves 24 and the slits 24
The pilfer-proof hem portion 22 is connected to the main portion 20 by a plurality of bridging portions 26. In the specific example shown in the figure, one specific bridge portion 26A among the plurality of bridge portions 26 has a larger width in the circumferential direction than the other bridge portions 26, so that the strength is significantly increased. ing. A weakened line 28 extending in the axial direction is formed in the pilfer-proof hem 22 at a position adjacent to one circumferential line of the specific bridge portion 26A. This line of weakness 28 may be a score or a perforation.

A female collar 30 is formed on the inner surface of the main portion 20 of the skirt wall 6, more specifically on the inner surface of the relatively thick upper portion 12. Further, the outer surface of the main portion 20, more specifically, the outer surface of the relatively thick upper portion 12, has an uneven or knurled shape to prevent fingers from being erased when the container lid 2 is rotated by placing the fingers thereon. 32 is advantageously formed. on the other hand,
A plurality of locking flap pieces 34 (30 in the illustrated case) are formed at intervals in the circumferential direction on the inner surface of the pilfer-proof hem 22, more specifically on the inner surface of the relatively thin lower portion 14. There is. Each such locking flap piece 34 extends radially from a base edge 36 connected to the inner surface of the pilfer-proof skirt 22.

The above-described fingers in the illustrated container lid 2 do not constitute a novel feature of the container lid 2 improved according to the present invention, but merely represent one example of the container lid to which the present invention is applied.

According to the present invention, the following improvements are made to the locking flap piece 34. Referring to FIGS. 2 and 3, each of the locking flap pieces 34 has a folding line 3.
8 and is defined by a first portion 40 extending from the base edge 36 to the folding line 38 and a second portion 42 extending from the folding line 38 to the free end. Said base edge 36 extends substantially parallel to the central axis of the container lid 2, and therefore substantially vertically. However, H
[If desired, the base edge 36 may be rotated in a suitable direction relative to the central axis of the container M2, that is, the closing rotation of the container lid 2 when the container lid 2 is attached to the mouth and neck of the container as described below.] Direction (first
It may also be configured to extend downward at an appropriate angle (clockwise in the figure, in the direction indicated by the arrow 44 in FIGS. 2 and 3), or in the opposite direction at an appropriate angle. The first portion 40 is preferably arranged in the closing rotation direction 4
4 and extends radially inward from the base thread east 36. The inclination angle α of the first portion 40 with respect to the inner surface of the pilfer-proof hem 22 is 5 degrees≦α
≦85 degrees, especially 20 degrees≦α≦80 degrees, especially 30 degrees≦α≦
Preferably it is 70 degrees.

A second portion 4 extending radially inward from the folding line 38
2 is required to be inclined with respect to the first portion 40 in the closing rotation direction. The inclination angle β of the second portion 42 with respect to the first portion 40 is 0 degrees to 1690 degrees,
It is particularly preferable that 0 degrees and β≦70 degrees, particularly 5 degrees≦β≦45 degrees. Said folding line 38 itself can extend substantially parallel to the central axis of the container lid 2, thus substantially vertically, or inclined downwardly towards the inner surface of the pilfer-proof skirt 22. However, it is preferable that the pilfer-proof hem portion 22 slopes downward in a direction Rf from the inner surface of the pilfer-proof hem portion 22. The inclination angle γ of the folding line 38 in the direction downward and away from the inner surface of the pilfer-proof hem 22 is 5 degrees≦γ≦80 degrees, particularly 10 degrees≦γ≦6.
It is preferable that the angle be 0 degrees, especially 20 degrees≦γ≦50 degrees.

As shown in FIGS. 1 and 2, the upper edge 46 of the first portion 40 extends radially inwardly and downwardly in a smooth curve at which the upper edge 46 of the second portion 42 extends. Conveniently, the upper edge 48 extends substantially horizontally. On the other hand, the first part 40
Advantageously, the lower edge 50 of the second portion 42 and the lower edge 52 of the second portion 42 extend radially inwardly and upwardly.

Generally, the inclination angle δ2 of the lower edge 52 of the second portion 42 is made somewhat larger than the inclination angle δ1 of the lower edge 50 of the first portion 40, and the inclination angle δ1 is 10 degrees≦δ
1≦30 degrees, and the above inclination angle δ2 is 20 degrees≦δ2≦5.
Advantageously, it is 0 degrees.

The above-described synthetic resin container lid 2 is applied to a container provided with a neck portion 54 having the shape shown in FIG. 4. The orifice 54, which is known per se, has a cylindrical outer circumferential surface on which a male thread 56 and a locking jaw 58 located below the male thread 56 are formed.

In order to occlude the mouth and neck part 54 with the container lid 2, the container lid 2 is fitted onto the mouth and neck part 54, and the container lid 2 is rotated in a four-rotation direction, that is, in a clockwise direction when viewed from above in FIG. .

In this way, the female thread 30 formed on the container lid 2 is screwed into the male thread 56 formed on the mouth and neck part 54, thereby causing the container lid 2 to move downward as it rotates. When the container lid 2 is moved downward, each of the locking flap pieces 34 formed on the container lid 2 engages the mouth and neck portion 54.
It passes through the male thread 56 formed in the locking jaw 56, and then passes through the locking jaw 58. However, when passing through the locking jaw 58, the locking jaw 58 interferes with the Each of the stop flap pieces 34 is elastically deflected radially outward. Connect the female thread 30 of the container lid 2 to the male thread 56 of the mouth and neck part 54.
When fully screwed together, each of the locking flap pieces 34 completely passes through the locking jaw 58 and is no longer interfered with by the locking throat 58, as shown in FIG. Each of the pieces 34 resiliently returns to its original state.

Therefore, as will be clearly understood from the description of Examples and Comparative Examples mentioned later, the container lid 2 improved according to the present invention
In this case, the necessary downward rotational torque that must be applied to the container lid 2 when the locking flap piece 34 is elastically deflected and passed through the locking jaw 58 is determined by the required downward rotational torque as shown by the two-dot chain line in FIG. The second portion 42 of the flap piece 34
the first portion 4 without being bent relative to the portion 40 of
The candy is substantially the same as a conventional container lid that extends in a straight line with the candy, and is sufficiently small.

Therefore, when attaching the container S2 to the mouth and neck part 54, excessive stress is generated in the weakened lines 18 and 28, and breakage of the weakened lines 18 and 28 is reliably avoided.

When each of the locking flap pieces 34 is fully restored to its original state, each of the locking flap pieces 34 locks onto the lower surface of the locking jaw 58, as shown in the opening in Figure 4. I am forced to do it. In addition, the female thread 30 of the container lid 2 is attached to the mouth and neck part 54.
When the sealing liner 10 is attached to the male thread 56, the sealing liner 10 is brought into close contact with the end face of the mouth and neck portion 54, as shown in FIG. 4, and the mouth and neck portion 54 is thus sealed.

The container lid 2, which has been attached to the mouth and neck 54 through the above procedure, is
When detaching from the mouth and neck part 54 and unsealing the mouth and neck part 54, the container lid 2 is rotated in the opposite direction to the four-rotation direction when it is attached, that is, in the counterclockwise direction when viewed from above in FIG. . In this way, the female G formed on the container lid 2
Since the thread 30 is moved along the male thread 56 formed in the neck portion 54, the container lid 2 is not moved upward. However, since the locking flap piece 34 formed on the inner surface of the pilfer-proof hem 22 of the container lid 2 is locked to the lower surface of the locking jaw 58 of the mouth and neck portion 54, the pilfer-proof hem The upward movement of portion 22 is prevented. Thus, considerable stress is generated in the weakened life 18 formed in the container lid 2, and the weakened line 18
The bridging portions 26 in are broken except for a specific bridging portion 26A having a large circumferential width and increased strength,
A considerable stress is also generated in the weakened life 28 formed in the pilfer-proof hem 22, the weakened line 28 is broken, and the pilfer-proof hem 22 is opened from an endless ring shape to an end band shape.

In this way, the locking of the locking flap piece 34 with respect to the lower surface of the locking jaw portion 58 is released, and after that, the locking of the locking flap piece 34 with respect to the lower surface of the locking jaw portion 58 is released. The entire container lid 2 including the tied pilfer-proof hem 22 is moved upward as it rotates, and thus the entire container lid 2 is separated from the mouth neck 54 and the mouth neck 54 is opened. (The specific bridge portion 26A in the weakened line 18 also has substantially the same strength as the other bridge portions 26, and when the weakened line 28 is not formed in the pilfer-proof hem 22, the weakened line 18
is completely broken and the pilfer-proof hem 22 is completely separated from the main part 20, so that the pilfer-proof hem 22 is left and the other parts of each instrument 2 are separated from the mouth and neck part 54.
).

As will be clearly understood from the description of Examples and Comparative Examples to be mentioned later, when removing the container lid 2 from the mouth and neck 54, the engagement is as shown by the two-point chain in FIG. Compared to conventional container lids in which the second portion 42 of the lug 34 extends in line with the first portion 40 without being bent relative to the first portion 40, this In the container lid 2 improved according to the invention, the locking flap piece 3
4 is quite strongly locked onto the lower surface of the locking jaw portion 58. In other words, the necessary upward rotational torque that must be applied to the container lid 2 when elastically deflecting the locking flap piece 34 and forcing it to pass through the locking jaw 58 from below to above has been improved according to the invention. The container lid 2 has a considerably increased capacity compared to conventional container lids. Therefore, break line 1
8 and 28 were not broken as expected and the mouth and neck part 5
It is reliably avoided that the container lid 2 is detached from the container lid 4, thus ensuring pilfer-proof properties.

If desired, a gripping piece may be provided on the outer surface of the pilfer-proof hem 22, preferably adjacent the right side of the weakened line 28, to remove the container lid 2 from the mouth neck 54 and open the mouth neck 54. When doing so, the weakened line 28 is broken by pulling the gripping protrusion, and the weakened line 18 is
is broken over its entirety, and then the container lid 2 is
It is also possible to rotate it counterclockwise when viewed from above in the figure.

<Example> Polypropylene (melt index 2.0, density 0.
90), weaken life 18 and weaken line 28
Ten container lid bodies having the same shape as the main body of the container lid 2 shown in FIGS. 1 to 3 were molded, except that the container lid 2 was not formed.

The inner diameter of the female thread of the molded container lid body was 25.4 m, the outer diameter of the upper part D was 30.0 m, and the total height H was 19.0 m. In each of the locking flap pieces 34 having a thickness t = 0
．． 35 rrrm, length t of the lower edge 50 of the first portion 40
L = 1.9 gates, length L2 of the lower edge 52 of the second portion 42 =
2. Owtr, inclination angle α=50 degrees, inclination angle β=
10 degrees, inclination angle r = 30 degrees, inclination angle δ1 = 20 degrees,
The inclination angle δ2 was 45 degrees, the upper edge 46 of the first portion 40 was a circular arc with a radius of 0.5+a, and the upper line 48 of the second portion 42 was Jigami Kamisui.

Such a container lid main body is attached to the mouth and neck part 54 of a glass container, which has a general name 28 in the shape of a general υ shown in FIG. In addition, the container lid attached to the mouth and neck part 54 was forcibly removed from the mouth and neck part 54, and the required rotational torque at this time, that is, the safety-increasing rotational torque was measured. The results are shown below.
It was the official statement.

Comparative Example> As a comparative example, each of the locking flap pieces 34 formed on the inner surface of the pilfer-proof hem 22 has a through-hole shape (i.e., a second portion) as shown by a two-dot chain line in FIG. 42 is bent with respect to the first portion 40;
10 and 1 container lid bodies were molded in the same manner as in the example except that they were in the form of green-like lobes).

Then, in the same manner as in the example, the inevitable downward rotational torque and the necessary upward rotational torque were added by 4111.8The results were as shown in Table 1 below.

Table 1

[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 present invention. 2 is a partial perspective view showing the locking flap piece of the container lid of FIG. 1; FIG. 3 is a partial bottom view showing the retaining flap piece of the container lid of FIG. 1; FIG. FIG. 4 is a side view, partially in section, showing a state in which the container lid of FIG. 1 is attached to the mouth and neck of the container to close the mouth and neck. 2... Container lid 4... Top wall 6... Skirt wall 18... Weakening line 20... Main part of skirt wall 22... Pilfer-proof hem 30... Male thread 34 ...Latching flap piece 38...Folding line 40...First portion 42 of the locking flap piece...Second portion 54 of the locking flap piece...Mouth and neck portion 56... Male thread 58...locking jaw part

Claims (1)

[Scope of Claims] 1. For a container equipped with a mouth and neck part in which a male thread and a locking jaw part located below the female thread are formed on the outer peripheral surface,
A synthetic resin container lid having pilfer-proof properties, comprising a top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, the skirt wall having a weakened line extending in the circumferential direction. The skirt wall is divided into a main part above the weakened line and a pilfer-proof hem below the weakened line, and the inner surface of the main part includes the male part of the mouth and neck part. A female thread is formed to be screwed into the thread, and a plurality of locking flap pieces projecting radially inward are formed at intervals in the circumferential direction on the inner surface of the pilfer-proof hem. In the container lid; each of the locking flap pieces has a first portion extending from the inner surface of the pilfer-proof hem, and a portion that is attached to the first portion when the container lid is attached to the mouth and neck. A container lid characterized in that it has a second portion that is inclined in the closing rotation direction of the container lid and further extends from the tip of the first portion. 2. The container lid according to claim 1, wherein the first portion extends from the inner surface of the pilfer-proof hem at an angle opposite to the closing rotation direction. 3. The container lid according to claim 2, wherein the inclination angle α of the first portion with respect to the inner surface of the pilfer-proof hem is 5 degrees≦α≦85 degrees. 4. The container lid according to claim 3, wherein the inclination angle α is 20 degrees≦α≦80 degrees. 5. The container lid according to claim 4, wherein the inclination angle α is 30 degrees≦α≦70 degrees. 6. The container lid according to any one of claims 1 to 5, wherein an inclination angle β of the second portion with respect to the first portion is 0 degrees < β ≦ 90 degrees. 7. The container lid according to claim 6, wherein the inclination angle β is 0 degrees<β≦70 degrees. 8. The container lid according to claim 7, wherein the inclination angle β is 5 degrees≦β≦45 degrees. 9. Claims 1 to 9, wherein the folding line between the first part and the second part extends downward and away from the inner surface of the pilfer-proof hem. 8th
Container lids described in any of paragraphs. 10. The container lid according to claim 9, wherein the angle of inclination γ of the folding line in the direction away from the inner surface of the pilfer-proof hem is 5≦γ≦80. 11. The container lid according to claim 10, wherein the inclination angle γ is 10 degrees≦γ≦60 degrees. 12. The container lid according to claim 11, wherein the inclination angle γ is 20 degrees≦γ≦50 degrees. 13. The upper edge of the first portion extends radially inward and downwardly, and the upper edge of the second portion extends substantially horizontally. A container lid as described in any of the above. 14. The container lid according to claim 13, wherein the upper edge of the first portion is a smooth curve. 15. The lower edge of the first portion and the lower edge of the second portion extend radially inwardly and upwardly. container lid.