JPS5832105B2 - Synthetic resin container lid with pill-proof properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin container lid having pilfer-proof properties.

Container lids with so-called pilfer-proof properties (properties to prevent tampering such as refilling of contents) for containers such as beverage bottles have traditionally been made of metal container lids made of metal materials such as aluminum-based alloys. However, recently, synthetic resin container lids made of synthetic resin materials instead of metal materials have also been proposed and put into practical use.

Two types of synthetic resin container lids having pilfer-proof properties have been proposed.

A typical example of the first type of synthetic resin container lid is the container lid disclosed in Japanese Patent Publication No. 52-14677.

This container lid includes a top surface and a cylindrical skirt that hangs down from the periphery of the top surface, the skirt has a circumferentially extending break line, and the skirt has a main portion above the break line. It is divided into a pilfer-proof hem below the break line.

A thread is formed on the inner surface of the main part of the skirt.

In addition, on the inside of the pilfer-proof hem of the skirt,
A plurality of reverse upward pawls or ratchet pawls are formed at intervals in the circumferential direction.

As can be easily understood from the above-mentioned Japanese Patent Publication No. 52-14667, the synthetic resin container lid of the first form as described above has an outer peripheral surface that cooperates with the non-return claw or ratchet claw. This method can only be applied to containers with a uniquely shaped container opening in which a reverse check pawl or ratchet is formed. It has the serious drawback of not being suitable for commercially available containers.

Also, when attaching the container lid to the container mouth, use the non-return pawl or ratchet pawl formed on the inner surface of the pilfer-proof hem (and/or the ratchet pawl formed on the outer circumferential surface of the container mouth). It is necessary to compress the check pawl or ratchet pawl and rotate them relative to each other, but in order to sufficiently compress the check pawl or ratchet pawl, it is necessary to apply a considerably large torque to the container lid. Therefore, it is relatively difficult to install the container lid, and there is also the disadvantage that, due to the considerable torques that are applied to the container lid, there is a risk that the break line will break during the installation of the container lid.

On the other hand, a typical example of the second type of synthetic resin container lid is the container lid disclosed in JP-A-54-8.3588.

In this container lid, instead of forming the plurality of non-return claws or ratchet claws on the inner surface of the pilfer-proof hem of the skirt, the pilfer-proof hem is provided at a plurality of positions spaced apart in the circumferential direction. The pilfer-proof hem part is stamped to form a tongue-like piece that projects radially inwardly and axially upwardly.

The synthetic resin container lid of the second form has a container opening of a normal form, for example, a container opening having a thread formed on the outer circumferential surface and a jaw part located adjacent to and below the thread. Jikosho 5
The present invention can be applied to a container having a container opening to which a metal container lid having pilfer-proof characteristics as disclosed in Japanese Patent No. 0-36022 can be applied.

When attaching a container lid to the container mouth and sealing it, place the container lid over the container mouth and rotate the container lid so that the thread formed on the inner surface of the main part of the skirt is inserted into the container mouth. Screw it into the thread formed on the outer peripheral surface.

At this time, the tongue-like piece defined by a part of the pilfer-proof hem of the skirt is elastically displaced radially outward by the action of the jaw formed on the outer circumferential surface of the container mouth. and when the container lid is fully seated on the container mouth, it passes through the jaws and returns to its original position, so that the upper edge of the tongue is below the jaws. Engage the edges.

In order to remove the container lid attached to the container mouth in this manner, the container lid is rotated in the opposite direction from when it was attached.

In this way, since the threads on the container lid are moved along the threads on the container mouth, the container lid is forced to move upward in the axial direction at the same time as it rotates.

However, since the upper edge of the tongue-shaped piece defined by a part of the pilfer-proof hem of the skirt engages with the lower edge of the jaw formed on the outer peripheral surface of the container mouth, , resisting axial upward movement of the container lid;
A significant force is thus applied to the break line formed in the skirt, causing the skirt to break along the break line.

After that, the container lid (more specifically, the top surface and the main part of the skirt) can be easily moved upward in the axial direction and removed from the container mouth.

Because of this, the synthetic resin container lid of the second form described above does not have the above-mentioned drawbacks found in the synthetic resin container lid of the first form.

However, the second type of synthetic resin container lid as described above is still not fully satisfactory; Therefore, it is necessary to stamp the hem of the pilfur-proof, which makes manufacturing relatively complicated and expensive. (b) Defining the tongue by a part of the hem of the pilfur-proof. As a result, a plurality of relatively large openings corresponding to the above-mentioned tongue-like pieces are formed in the hem of the Bilferproof, and there is a risk that dust, etc. may accumulate in such openings, causing hygienic problems. (c) Container With the container lid attached to the mouth, it is possible to displace the tongue-like piece radially outward by inserting a thin metal wire through the opening and hooking it on the tongue-like piece, thereby causing the tongue-like piece to break. It is possible to remove the container lid from the container mouth without breaking the line, and the pilfer-proof property is relatively easily damaged. It is generated by forcibly displacing a portion inward in the radial direction, and does not protrude inward in the radial direction when a synthetic resin molding process such as injection molding is performed prior to the stamping process. Therefore, when the container lid is attached to the container opening, if it is displaced radially outward by the action of the jaw, it will pass through the jaw and then move radially outward without returning sufficiently inward. There are problems to be solved, such as the fact that the pilfer-proof properties are not sufficiently ensured because the pilfer-proof properties tend to remain displaced in the opposite direction.

As another example of the second form of synthetic resin container lid, further,
Utility Model Publication No. 53-108558 or Utility Model Publication No. 46-24
The container lid disclosed in Japanese Patent No. 149 can be mentioned.

In such a container lid, a plurality of tongues or a single annular projecting plate are formed on the inner surface of the pilfer-proof hem of the skirt, extending downward in the axial direction and slanting inward in the radial direction.

The tongue piece or annular projecting plate is formed at the same time as the container lid is injection molded or compressed (embossed), and no opening or the like is created at the hem of the pilfer pull loop.
The container lid disclosed in Japanese Patent No.-83588 does not have the above-mentioned problems.

However, in the container lid disclosed in the above-mentioned Japanese Utility Model Publication No. 53-108558 or Japanese Utility Model Publication No. 46-24149, the tongue piece or annular protruding plate extends downward in the axial direction from the inner surface of the pilfer-proof hem. Because of the radially inwardly sloped configuration, significant problems exist as follows.

That is, as understood from the description of the above-mentioned Japanese Utility Model Publication No. 53-108558 or Japanese Utility Model Publication No. 46-24149, (
b) The tongue piece or annular projecting plate must be inverted around its upper edge (base edge) connected to the inner surface of the pilfer-proof hem so that it extends upward in the axial direction, and therefore, When attaching the container lid to the container mouth, it is necessary to apply a considerable amount of force, making the attachment operation quite difficult. A considerably large stress is inevitably generated at the break line, and there is a considerable risk that the break line will break due to this. (c) When attaching the container lid to the container mouth, It is often the case that the lower end (free end) of the tongue or annular veneer is simply deflected in the radial direction without the veneer being reversed as required; If the container lid is attached to the container mouth by simply bending the free end portion radially outward without being reversed, the free end of the tongue or annular protrusion may engage the lower edge of the jaw. Therefore, there is a problem that the pilfer-proof hem is not prevented from moving upward in the axial direction, and the pilfer-proof characteristic cannot be obtained.

The present invention has been made in view of the above facts, and its main purpose is to provide a synthetic resin container lid with pilfer-proof properties, which solves the above-mentioned problems and drawbacks that exist in known container lids. It is an object of the present invention to provide an improved container lid that does not have any

According to the invention, a composition having pilfer-proof properties is provided for a container having a container opening formed on the outer peripheral surface with a thread and a jaw located adjacent to and below the thread. A container lid made of resin, comprising a top surface and a cylindrical skirt that hangs down from the periphery of the top surface, the skirt is formed with a circumferentially extending break line, and the skirt is formed along the break line. The container is divided into a main part above the break line and a pilfer-proof hem below the break line, and a thread is formed on the inner surface of the main part to be screwed into the thread of the container opening. In the container lid where the container lid is attached, the inner surface of the pilfer-proof hem has a surface that prevents rotation of the container lid when the container lid is attached to the container mouth from the one side edge connected to the inner surface of the pilfer-proof hem. at least one flap piece is formed that extends radially inwardly in a direction opposite to the direction, and a lower edge of the flap piece extends upwardly from the one side edge; When the container lid is attached to the container mouth, the flap pieces pass through the jaws by elastically deflecting radially outward, and when the container lid is fully attached to the container mouth, the flap pieces pass through the jaws. The flap piece that has passed through the section is elastically restored, and the upper edge of the flap piece engages the lower edge of the jaw to prevent the pilfer-proof hem from moving upward in the axial direction. A container lid is provided.

A more detailed description will be given below with reference to the accompanying drawings.

A concrete example of the synthetic resin container lid according to the present invention will be explained with reference to FIGS. 1 and 2. , is provided with a cylindrical skirt 6 that hangs down from the periphery of the top surface 4.

Preferably, the inner surface of the top surface 4 is provided with an annular seal portion 8 having an appropriate cross-sectional shape.

A break line 10 extending in the circumferential direction is formed in the skirt 6, and the break line 10 allows the skirt 6 to have a main portion 12 above the break line 10 and a pilfer-proof hem below the break line 10. It is divided into 14 sections.

In the specific example shown, the breaking line 10 is composed of a plurality of slits (cut grooves) 16 formed at predetermined intervals in the circumferential direction, and the so-called bridging portion 18 between the slits 16 allows the rupture line 10 to be The fur-proof hem 14 is the main part 12
It is connected to the.

A thread 20 is formed on the inner surface of the main portion 12 of the skirt 6.

Further, the outer surface of the main portion 12 of the skirt 6 is knurled so that the container lid 2 can be surely and easily gripped and rotated with fingers.

The above-described configurations of the illustrated container lid 2 do not constitute novel features of the container lid according to the invention, but are already known per se.

According to the present invention, at least one flap piece 22, preferably a plurality of flap pieces 22, is formed on the inner surface of the pilfer-proof hem 14 of the skirt portion 6 at appropriate intervals in the circumferential direction.

In the illustrated example, six flap pieces 22 (only some of which are shown in the drawing) are formed at equal intervals in the circumferential direction.

To explain with reference to FIG. 3 together with FIGS. 1 and 2,
Each of the flap pieces 22 has a pilfer-proof hem 14
from one side edge 22a connected to the inner surface of the container, in a direction opposite to the direction of rotation of the container lid 2 when the container lid 2 is attached to the container opening 24 (i.e., counterclockwise when viewed from above in FIG. 2). It extends radially inwardly toward.

The upper edge 22b of each flap piece 22 may extend substantially horizontally, while the lower edge 22c of each flap piece 22 is free from said one side edge 22a connected to the inner surface of the pilfer-proof hem 14. It is important that it extends upwardly towards the edge.

Therefore, the axial width of the illustrated flap piece 22 gradually decreases from the one side edge 22a toward the free edge.

Next, referring to FIGS. 2 and 4, an example of a container opening to which a container lid according to the present invention is applied will be described. A thread 26 corresponding to the thread 20 formed on the lid 2 is formed.

Also, adjacent to and below the thread 26,
A so-called jaw portion 28 having an annular flange surface 30 is formed at the lower end.

Such a container mouth part 24 itself is, for example,
This is a normal form to which a metal container lid with pilfer-proof characteristics as disclosed in Publication No. 022 can be applied, and is provided in containers widely distributed in the market. There is no need for special construction for container lids according to the invention.

In order to seal the container opening 24 by applying the container lid 2 as shown in FIG. 1 to the container opening 24 as shown in FIG. Then, rotate the container lid 2 clockwise when viewed from above in FIG.

In this way, the thread 20 formed on the container lid 2 is screwed into the thread 26 formed on the container mouth 24, thereby causing the container lid 2 to move downward in the axial direction as it rotates.

When the container lid 2 is moved downward, the flap piece 22 formed on the container lid 2 passes through the thread 26 formed on the container mouth 24 and further through the jaw 28. However, in this case, Figure 5-A and Figure 5-
As shown in Figure B, the flap piece 22 is elastically deflected radially outward under the action of the jaws 28, so that as the container lid 2 moves downward, the flap piece 22 passes through the jaws 28. be able to.

In this regard, the following facts should be noted.

As described above, the lower edge 22c of the flap piece 22 is connected to the one side edge 22a connected to the inner surface of the pilfer-proof hem 14.
It extends upwardly from the free edge toward the free edge.

Therefore, as can be understood by referring to FIGS. 3 and 4, when the container lid 2 is moved downward, the entire circumferential direction of the flap piece 22 is simultaneously subjected to the action of the jaw 28. does not start, but gradually receives the action of the jaw part 28 from the one side edge 22a toward the free edge, and the container lid 2
As it moves downward, it is gradually bent from its one side edge 22a toward its free edge.

Therefore, the flap piece 22 can be elastically deflected radially outwardly and passed through the jaw 28 with sufficient ease and smoothness.

Therefore, according to the container lid 2 according to the present invention, the container lid 2 can be attached to the container opening 24 easily and smoothly.
can be sealed, and also therefore the container lid 2
There is no fear that the breaking line 10 will be broken during installation.

When the threads 20 of the container lid 2 and the threads 26 of the container opening 24 are fully screwed and the container lid 2 is fully attached to the container opening 24 as shown in FIG. Part 2
8 and is no longer affected by the jaws 28 and returns elastically to its original state.

In this way, the upper edge 22b of the flap piece 22
8, that is, the flange surface 30 formed at the lower end of the jaw portion 28.

On the other hand, the annular seal portion 8 formed on the inner surface of the top surface 4 of the container lid 2 engages with the upper edge of the container mouth 24, and thus the container mouth 24 is reliably sealed.

When the container lid 2 attached to the container opening 24 is removed from the container opening 24 as described above and the container opening 24 is opened, the rotation direction of the container lid 2 is reversed to the rotation direction when the container lid 2 is attached. direction, that is, counterclockwise when viewed from above in FIG.

In this way, since the thread 20 formed on the container lid 2 is moved along the thread 26 formed on the container mouth 24, the container lid 2 is not moved upward in the axial direction.

However, the pilfer-proof hem 14 of the container lid 2
Since the upper edge 22b of the flap piece 22 formed on the inner surface of the container is engaged with the lower edge of the jaw 28 of the container opening 24, that is, the flange surface 30, upward movement of the container lid 2 in the axial direction is prevented. Thus, a considerable stress acts on the break line 10 formed in the skirt 6 of the container lid 2, and in the illustrated embodiment, the bridge portion 18 thereof. is broken, and the container lid 2 is separated into two parts: the pilfer-proof hem 14 and other parts (namely, the top surface 4 and the main part 12 of the skirt 6).

After that, the portion of the container lid 2 other than the pilfer-proof hem 14 can be easily moved upward in the axial direction, and therefore moves upward in the axial direction in accordance with the rotation of the container lid 2, thereby closing the container opening. The person is forced to leave the section 24.

On the other hand, the pilfer-proof hem 14 does not separate from the container opening 24 and remains there.

The container lid 2 according to the present invention as described above can be manufactured from a suitable synthetic resin material, such as polyethylene, polypropylene, etc., only by a suitable synthetic resin molding process such as injection molding.

There is no need to perform stamping or the like subsequent to the synthetic resin molding process, and therefore, the product can be manufactured easily and in a stable manner.

When the container lid 2 is attached to the container mouth 24, the flap piece 22 can be elastically bent radially outward and passed through the jaw 28 easily and smoothly as described above. The container lid 2 can be attached to the container opening 24 with sufficient ease, and there is no fear that the breaking line 10 will be broken during attachment.

In addition, when manufactured by a synthetic resin molding process such as injection molding, the flap piece 22 extends radially inward from the inner surface of the pilfer pull loop hem 14, so that the original configuration of the flap piece 22 is similar to that of a pill. Since it extends radially inward from the inner surface of the fur-proof hem 14, when the container lid 2 is fully attached to the container mouth 24 and the flap piece 22 passes through the jaw 28, the flap piece 22 is elastically Make sure that the upper edge 22 of the flap piece 22 returns to its original state.
a positively engages the lower edge or flange surface 30 of the jaw 28, thus ensuring pilfer-proof properties.

When attaching the container lid 2 to the container mouth 24, use the flap piece 2.
2 is relatively easily bent, and the container lid 2 is attached to the container opening 24.
In order to satisfactorily satisfy the requirement that the upper edge of the flap piece 22 reliably engages the lower edge of the jaw 28, ie, the flange surface 30, after the flap piece 22 has been fully installed, the material of the container lid 2, i.e. Although it varies somewhat depending on the synthetic resin material from which the container lid 2 is molded, the above flap piece 2
2 is approximately 5 to the inner surface of the pilfer-proof hem 14.
The flap piece 22 preferably extends at an angle of 5 to 45 degrees (i.e. the angle α shown in FIG. 3 is approximately 5 to 45 degrees), and also has a thickness t (FIG. 5-A). is preferably approximately 0.5 to 3 degrees.

If desired, the thickness t of the flap piece 22 can be gradually increased from its lower edge to its upper edge, such that the thickness of the upper edge is approximately 0.5 to 3 mm thick.

Furthermore, in the container lid 2 according to the present invention, there is no opening in the pilfer-proof hem 14, and as can be easily understood from FIG. , the flap piece 22 is completely covered by the pilfer-proof hem 14, so that it is impossible to manipulate the flap piece 22 from the outside using a thin metal wire or the like, and more specifically, to displace it radially outward. It is possible.

Therefore, it is impossible to remove the container lid 2 from the container mouth 24 without breaking the rupture line 10, and the pilfer-proof property is reliably guaranteed without being damaged.

. Although several specific examples of the container lid of the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to these specific examples, and various modifications may be made without departing from the scope of the present invention. Needless to say, it is possible to modify or modify.

For example, in the illustrated example, when the container lid is removed from the container mouth and the container mouth is opened, the break line formed in the skirt is completely broken and the skirt is separated from the main part and the pilfer. Therefore, the top surface of the container lid and the main part of the skirt are separated from the container mouth, but the pilfer-proof hem is configured to remain in the container mouth. .

However, if desired, as is already known in metal container closures having pilfer-proof properties, the pilfer-proof skirt may be provided with at least one axially extending break line and the circumference formed in the skirt. A part of the rupture line in the direction is made strong, and when the container lid is removed from the container mouth and the container mouth is opened,
The axial break line formed on the hem of the pilfur proof is broken and the hem of the pilfer proof is opened from an annular shape to a band shape, while the circumferential break line formed on the skirt is not completely broken. Therefore, the pilfer-proof hem of the skirt is not completely separated from the main part, but remains partially connected to the main part, so that the pilfer-proof hem is connected to the container opening. It is also possible to make it possible for the entire container lid including the pilfer-proof hem to be removed from the container mouth without leaving any residue on the container.

Additionally, the lower end of the skirt of a container lid of the form shown in FIGS. 1 and 2, and therefore the lower end of the pilfer-proof hem, is extended downward for a considerable length, and the container lid is generally used as a stell cap. It can also be in the form named.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a specific example of the container lid of the present invention. FIG. 2 is a side view, partially in section, showing a state in which the container lid shown in FIG. 1 is attached to the container mouth and the container mouth is sealed. FIG. 3 is an enlarged partial perspective view showing details of the flap piece. FIG. 4 is a side view of a container opening to which the container lid shown in FIG. 1 is applied. FIG. 5-A is a partial sectional view showing the behavior of the flap piece when the container lid shown in FIG. 1 is attached to the container mouth. Figure 5-B is a sectional view taken along line 5-B3-H in Figure 5-A. 2...Container lid, 4...Top surface, 6...
...Skirt, 10...Break line, 12.
... Main part of the skirt, 14 ... Pilfer-proof hem, 20 ... Thread, 22 ...
... Flap piece, 24 ... Container opening, 26 ...
...Thread, 28...Jaw part.

Claims (1)

[Claims] 1. A container having pilfer-proof characteristics for a container having a container opening in which a thread is formed on the outer peripheral surface and a jaw part adjacent to and located below the thread. A container lid made of synthetic resin, comprising a top surface and a cylindrical skirt that hangs down from the periphery of the top surface, and the skirt is formed with a circumferentially extending fracture line, and the skirt It is divided into a main part above the line and a pilfer-proof hem below the break line, and the inner surface of the main part has a thread that is screwed into the thread of the container opening. In the container lid that is formed, the inner surface of the pilfer-proof hem has a side edge connected to the inner surface of the pilfer-proof hem that is used to attach the container lid to the container mouth. At least one flap piece is formed that extends radially inwardly in a direction opposite to the direction of rotation, and a lower edge of the flap piece extends upwardly from the one side edge. , when attaching the container lid to the container mouth,
The flap piece passes through the jaw by elastically deflecting outward in the radial direction, and when the container lid is fully attached to the container mouth, the upper edge of the flap piece that has passed through the jaw will What is claimed is: 1. A container lid that engages with a lower edge of the pilfer-proof hem to prevent upward movement in the axial direction of the pilfer-proof hem. 2 the upper edge of the flap piece extends substantially horizontally;
2. A container lid according to claim 1, wherein the axial width of said flap piece gradually decreases from said one side edge toward the free edge. 3. A container lid according to claim 1 or claim 2, wherein the flap piece extends at an angle of approximately 5 to 45 degrees with respect to the inner surface of the pilfer-proof hem. 4. The container lid according to any one of claims 1 to 3, wherein the flap piece has a thickness of approximately 0.5 to 3 mm. 5. Any of claims 1 to 3, wherein the flap piece gradually becomes thicker from its lower edge to its upper edge, and the thickness of the upper edge is about 0.5 to 3 inches. Container lid with crab description.