JPH0130702B2 - - 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.

The first type of synthetic resin container lid includes a top surface and a cylindrical skirt that hangs down from the periphery of the top surface, as disclosed in, for example, Japanese Unexamined Patent Publication No. 54-83588. A fracture line defined by a plurality of slits extending in the circumferential direction and a bridge section existing between the slits is formed, and the skirt has a main portion above the wave line and the fracture line. and a pilfer-proof hem portion which is located below the main portion and connected to the main portion by the bridge portion. A thread is formed on the inner surface of the main portion of the skirt, and a plurality of projections are formed on the inner surface of the pilfer-proof hem portion of the skirt at intervals in the circumferential direction.

Such a synthetic resin container lid has a container opening having a normal shape, in which a thread is formed on the outer circumferential surface and a jaw part adjacent to and located below the thread. The present invention is applied to a container having a container opening to which a metal container lid having pilfer-proof properties as disclosed in the above publication can be applied. When attaching and sealing a container lid to the container opening, the container lid is fitted onto the container opening and rotated, and the thread formed on the inner surface of the main portion of the skirt is inserted into the container opening. Screw it into the thread formed on the outer peripheral surface of. At this time, the protrusion formed on the inner surface of the pilfer-proof hem of the skirt is elastically compressed or deflected downward by the action of the jaw formed on the outer peripheral surface of the container mouth. When the container lid is fully attached to the mouth of the container, it passes through the jaw and is released from the compression action of the jaw and returns to its original state, so that the upper surface of the protrusion is Engages with the lower surface of the jaw. 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 of the container lid are moved along the threads to the container mouth, the container lid is not moved upward in the axial direction simultaneously with rotation. However, since the upper surface of the projection formed on the inner surface of the pilfer-proof hem of the skirt engages with the lower surface of the jaw formed on the outer periphery of the container mouth, the axis of the container lid Resisting upward movement in the direction, a substantial force is applied to the break line thus 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.

However, the first type of synthetic resin container lid as described above has the following serious problems or drawbacks.

That is, in the synthetic resin container lid of the first form as described above, when the container lid is attached to the container mouth, the projections need to be compressed or deflected to pass through the jaws. However, in order to sufficiently compress or deflect the protrusion, it is necessary to apply a considerable amount of torque to the container lid, making it relatively difficult to apply the container lid, and also to apply a considerable amount of torque to the container lid. Due to the torque, there is a risk that the above-mentioned breaking line may be broken when the container lid is attached. In order to solve such problems or drawbacks, it is possible to reduce the amount of inward protrusion of the protrusion or to make the protrusion softer or more flexible. The upper surface of the protrusion becomes insufficiently engaged with the lower surface of the jaw after the
Pilf-proof properties are lost.

The second type of synthetic resin container lid is disclosed in Japanese Patent Publication No. 52-14677, for example, and has a plurality of protrusions on the inner surface of the pilfer-proof hem of the skirt. It is formed with individual non-return pawls or ratchet pawls.

As can be easily understood from the above-mentioned Japanese Patent Publication No. 52-14667, the synthetic resin container lid of the second form has a reverse direction on the outer circumferential surface that cooperates with the above-mentioned non-return claw or ratchet claw. It can only be applied to containers with a uniquely shaped container opening in which a pawl or ratchet is formed, and is not applicable to commonly distributed containers having a container opening in the usual shape as described above. It has a serious drawback that it cannot be applied to Also, when attaching the container lid to the container mouth, check the non-return claws or ratchet claws formed on the inner surface of the pilfer-proof hem and/or the non-return claws or ratchet claws formed on the outer circumferential surface of the container mouth. Since it is necessary to compress the pawls or ratchet pawls and rotate them relative to each other, the above-mentioned problems and drawbacks of the first type of synthetic resin container lid also exist.

The present invention has been made in view of the above facts, and its technical problem is that the synthetic resin container lid of the first form does not have a unique shape of the container opening, but has a screw thread on the outer circumferential surface. Applicable to a container having a container opening of a normal shape, in which a jaw is formed adjacent to and below the thread.
By improving the synthetic resin container lid with pilfer-proof properties, the container opening can be improved without causing insufficient engagement of the protrusion with the jaw after the container lid is fully attached to the container opening. To prevent a break line from being broken when attaching a container lid to a container.

The solution of the present invention is that each of the plurality of protrusions arranged on the inner surface of the pilfer-proof hem is arranged between two adjacent bridging parts when viewed in the circumferential direction, and the container lid is closed. When attached to the container mouth, the pilfer-proof hem does not substantially displace radially outward in the part where the bridging part is arranged, but the pilfer-proof hem does not displace substantially in the part where the protrusion is arranged. The container is elastically displaced radially outward so that the protrusion passes through the jaw of the container mouth.

In the container lid of the present invention, when the container lid is attached to the container opening, the pilfer-proof hem is elastically displaced radially outward in the portion where the protrusion is arranged, but the bridge The pilfer-proof hem is not substantially displaced radially outward in the portion where the binding portion is located (therefore, the pilfer-proof hem is deformed from an annular shape to a substantially polygonal shape); Therefore, when attaching the container lid to the container opening, no excessive stress is generated in the bridge portion, and the breakage line is therefore sufficiently prevented from breaking.

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

A specific example of a synthetic resin container lid according to the present invention will be explained with reference to FIG. be able to. The illustrated container lid, designated as a whole by the number 2, includes a circular top surface 4 and a cylindrical skirt 6 depending from the periphery of the top surface 4. Top surface 4
An annular seal portion 8 having an appropriate shape that engages with the edge of the container mouth can be formed on the inner surface of the container. If desired, instead of integrally forming the annular seal portion 8 on the inner surface of the top surface 4, a separate packing member or inner lid member formed in an appropriate shape may be provided between the inner surface of the top surface 4 and the container opening. It can also be interposed between the edge of the 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 meet the break line 1.
It is divided into a main part 12 above the line 10 and a pilfer-proof hem part 14 below the break line 10. The breaking line 10 includes a plurality of slits 16 extending in the circumferential direction and these slits 1.
The pilfer-proof hem 14 is connected to the main portion 12 by the so-called bridging portion 18 between the slits 16 . A screw plate 20 is formed on the inner surface of the main portion 12 of the skirt 6. Further, it is advantageous that the outer surface of the main portion 12 of the skirt 6 is knurled so that the container lid 2 can be securely and easily gripped and rotated with fingers.

Referring to FIG. 2 together with FIG. 1, the inner surface of the pilfer-proof hem 14 of the skirt 6 is provided with a plurality of protrusions 22 that protrude radially inward at intervals in the circumferential direction. ing. The protrusions 22 may be of any shape as long as they can achieve the desired effect as mentioned below, but as clearly illustrated in FIG.
The amount of inward protrusion in the radial direction increases gradually from the lower part in the axial direction to the upper part, and the rotation direction of the container lid 2 when the container lid 2 is attached to the container mouth (i.e., the direction shown by the arrow in FIG. 2). 23), the amount of radial inward protrusion gradually increases from the front to the rear, and furthermore, the upper surface is a flat surface extending substantially horizontally. Preferred (these reasons will be explained later).

In the container lid 2 improved according to the present invention,
As can be understood by referring to FIG.
Each of the protrusions 22 provided on the inner surface of the pilfer-proof hem 14 has two adjacent protrusions in the circumferential direction.
It is important that the two bridging parts 18 are arranged between the two bridging parts 18. In other words, when viewed in the circumferential direction, it is important that the bridging portions 18 are not present in the portions where the protrusions 22 are present, and that the bridging portions 18 are arranged between adjacent protrusions 22 . Pilfer-proof hem 14
is thinner than the main portion 12 of the skirt 6 and has sufficient flexibility.

Next, referring to FIG. 3 together with FIG. 1, 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. Adjacent to and below the thread 26, a so-called jaw portion 28 having an annular flange surface 30 at its lower end is formed. The container opening 24 itself has a normal shape to which a metal container lid having pilfer-proof properties as disclosed in Japanese Utility Model Publication No. 50-36022 can be applied, and is widely used in the market. This is a feature that is included in containers that are on the market, and does not need to be specially manufactured for the container lid according to the present invention.

The container lid 2 as shown in FIG. 1 is applied to the container opening 24 as shown in FIG.
4, the container lid 2 is fitted onto the container opening 24, and the container lid 2 is rotated clockwise when viewed from above in FIG. In this way, the container lid 2
A thread 20 formed on the container opening 24 is screwed into a threaded plate 26 formed on the container opening 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 protrusion 22 formed on the container lid 2 moves toward the container opening 2.
4 , which causes a force to be applied from the jaw 28 to the pilfer-proof hem 14 via the protrusion 22 .
In the container lid 2 constructed according to the present invention, since the protrusion 22 and the bridging part 18 are arranged in the above-described relationship, the pilfer-proof hem part 14 has a structure in which the bridging part 18 is The portion where the projection 22 is placed does not substantially displace outward in the radial direction, but the portion where the protrusion 22 is placed is displaced outward in the radial direction, thus elastically deforming from an annular shape to a substantially polygonal shape,
The protrusion 22 thus passes through the jaw 28 and moves downward.

To explain in more detail the elastic deformation of the pilfer-proof hem 14 when the protrusions 22 pass through the jaws 28, if there are two protrusions 22 provided on the inner surface of the pilfer-proof hem 14, the pilfer-proof hem 14 will The proof hem 14 is elastically deformed into the form shown in FIG. 4-A, and three protrusions 22, four
In the case of 5 pieces, 5 pieces and 6 pieces, the pilfer-proof hem 14 is shown in FIG. 4-B, FIG. 4-C, respectively.
It is elastically deformed into the form shown in FIGS. 4-D and 4-E.

The above-described elastic deformation of the pill-proof hem 14 is caused by the protrusion 22 coming into contact with the jaw 28 when the container lid 2 is attached to the container mouth 24, and the pill-proof hem being moved from the jaw 28 through the protrusion 22. Part 14
This is due to the fact that the protrusion 22 has a form as shown in FIG. , when the container lid 2 is attached to the container opening 24, the amount of radial inward protrusion gradually increases from the front to the rear when viewed in the direction of rotation of the container lid 2 (direction shown by arrow 23). As can be easily understood, if the protrusion 22
While moving downward in the direction shown by the arrow 23 and passing through the jaw 28, the force acting on the pilfer-proof hem 14 from the jaw 28 via the protrusion 22 does not suddenly increase. The pilfer-proof hem 14 is also gradually elastically deformed, so that the container lid 2 can be attached to the container opening 24 relatively easily and smoothly.

Threads 20 on the container lid 2 and threads 26 on the container opening 24
When the container lid 2 is fully screwed together and the container lid 2 is fully attached to the container opening 24 as shown in FIG. In this way, the pilfer-proof hem 14 that has been elastically deformed elastically returns to its original state (if there are two protrusions 22 provided on the pilfer-proof hem 14, the fourth-A
The pilfer-proof hem 14, which had been elastically deformed into the shape shown in the figure, returns to the substantially circular state shown in FIG. 5). When the elastically deformed pilfer-proof hem 14 returns to its original state, the upper surface of the protrusion 22 is formed on the lower surface of the jaw 28 (i.e., at the lower end of the jaw 28), as shown in FIG. the annular flange surface) 30.

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. rotate it in the direction. 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 does not move upward in the axial direction. However, since the upper surface of the protrusion 22 formed on the inner surface of the pilfer-proof hem 14 of the container lid 2 engages with the lower surface, that is, the flange surface 30 of the jaw 28 of the container mouth 24, An axial upward movement is prevented, and a considerable stress is thus exerted on the bridge 18 of the break line 10 formed in the skirt 6 of the container lid 2;
As a result, the rupture line 10 (its bridging portion 18)
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, and the container lid 2 is moved upward in the axial direction. It is removed from the mouth portion 24. On the other hand, the pilfer-proof hem 14 does not come off from the container mouth 24 and remains there.

In the container lid 2 according to the present invention as described above, when the container lid 2 is fully attached to the container mouth 24 and the container mouth 24 is sealed, the pilfer-proof hem 14 is elastically deformed. , the protrusion 22 is allowed to pass through the jaw 28. Therefore, the protrusion 22 itself does not need to be particularly compressed or deflected, and the protrusion 22 itself can be made relatively strong. Therefore, the container lid 2
This allows the engagement between the upper surface of the protrusion 22 and the lower surface 30 of the jaw portion 28 to be sufficiently strong after it has been sufficiently attached to the container mouth portion 24, and to ensure that the pilfer-proof property is not easily damaged. can be made into something. In particular, as shown in FIG. 2, when the upper surface of the projection 22 is a flat surface extending substantially horizontally, the upper surface of the projection 22 and the jaw portion 28
The engagement with the lower surface 30 can be made even more reliable.

By the way, when attaching the container lid 2 to the container mouth part 24, as described above, the pilfer-proof hem part 14 is attached to the parts shown in FIGS. 4-A, 4-B, 4-C, and 4-D. It is elastically deformed into the form as shown in FIG. ), the pilfer-proof hem 14 has a relatively large displacement in the radial direction, but in the area indicated by the symbol B (i.e., the intermediate portion between the parts), the pilfer-proof hem 14 has substantially no displacement or a significantly small displacement in the radial direction. only displacement. If the bridging portion 18 at the fracture line 10 is disposed in the region A, the presence of the bridging portion 18 will inhibit the elastic deformation of the pill-proof hem 14, or the pill will be damaged. The stress generated in the bridging part 18 due to the elastic deformation of the far-proof hem 14 may cause the bridging part 18 to break. Therefore, the breaking line 10
It is preferable that the bridging portion 18 is disposed in the area B described above. Also, attach the container lid 2 to the container opening 2.
In order to more reliably prevent the bridging part 18 from breaking when attached to the skirt 6, if desired, the main part of the skirt 6 can be removed, preferably at a position adjacent to the bridging part 18, as shown in FIG. An engaging piece 32 hanging down from the lower edge of the portion 12 and an engaging piece 34 raised from the upper edge of the pilfer-proof hem 14 are provided, and the container lid 2 is rotated in the direction shown by the arrow 23 in FIG. Mouth part 2
4, the engaging pieces 32 and 34 engage with each other, and the main portion 12 of the skirt 6 is attached to the pilfer-proof hem 14 through the engaging pieces 32 and 34 in the direction indicated by the arrow 23. It can also be used to convey power.

Although a specific example of a container lid configured according to the present invention has been described above in detail, the present invention is not limited to such a specific example, and various modifications and changes can be made without departing from the scope of the present invention. It is needless to say that modifications can be made.

For example, in the illustrated example, the container opening 2
When the container lid 2 is removed from the container opening 24 to open the container opening 24, the break line 10 formed in the skirt 6 is completely broken and the skirt 6 is removed from the main portion 12.
The top surface 4 of the container lid 2 and the main portion 12 of the skirt 6 are separated from the container opening 24, but the pilfer-proof hem 14 is completely separated from the container opening. It is configured to remain in the portion 24. However, if desired, the bridging section 1 preferably at the break line 10, as shown in FIG. 6 or FIG.
Pilfer-proof hem 1 at a position close to 8
One or more breaking lines 36 (such breaking lines may be so-called perforations or so-called scores that locally reduce the thickness of the material) extending in the axial direction are formed on the skirt 6. At least a portion of the bridge portion 18 at the fracture line 10 is made strong, and the container mouth portion 2 is made strong.
When the container lid 2 is removed from the container lid 2 to open the container opening 24, at least one of the axial break lines 36 formed in the pilf-proof hem 14 is broken, and the pilf-proof hem 14 is opened. On the other hand, the break line 10 formed in the skirt 6 is not completely broken, so the pilfer-proof hem 14 of the skirt 6 is not completely separated from the main part 12. The container lid 2 including the pilfer-proof hem 14 remains partially connected to the main portion 12, thus preventing the pilfer-proof hem 14 from remaining in the container mouth 24. It is also possible to make the entire container detachable from the container opening 24.

Further, the lower end of the skirt 6 of the container lid 2 as shown in FIG. 1 and FIG. It can also be in the form of what is generally called a stealth cap.

[Brief explanation of drawings]

FIG. 1 is a side view, partially in cross section, showing a specific example of a container lid configured according to the present invention in a state where it is attached to a container mouth and the container mouth is sealed. 2 is a perspective view showing a part of the container lid shown in FIG. 1; FIG. FIG. 3 is a side view of a container opening to which the container lid shown in FIG. 1 is applied. Figure 4-A, Figure 4-B, Figure 4-C
4-D and 4-E are cross-sectional views showing how the pilfer-proof hem is elastically deformed when the container lid is attached to the container mouth. FIG. 5 is a sectional view corresponding to FIG. 4-A, showing the shape when the elastically deformed pilfer-proof hem returns to its original state. 6 and 7 are partial side views showing a modification of the container lid constructed according to the present invention. 2...Container lid, 4...Top surface, 6...Skirt,
10...Break line, 12...Main part of skirt,
14... Pilf-proof hem, 16... Slit at the break line, 18... Bridge at the break line, 20... Thread, 22... Protrusion, 24... Container mouth, 26... Thread , 28...chin area.

Claims (1)

[Scope of 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 wall, the skirt having a plurality of slits extending in the circumferential direction and bridges between the slits. A break line defined by a section is formed, and the skirt is connected to the main section above the break line and to the main section below the break line and by the bridging section. The main part is divided into a pilfer-proof hem part, and a thread is formed on the inner surface of the main part to be screwed into the thread of the container mouth part. is a container lid in which a plurality of protrusions projecting radially inward are provided at intervals in the circumferential direction; viewed in the circumferential direction, each of the protrusions is located between two adjacent bridging parts. When the container lid is attached to the container mouth, the pilfer-proof hem does not substantially displace outward in the radial direction in the part where the bridging part is located; The pilfer-proof hem is configured to be elastically displaced radially outward at the portion where the protrusion is located, thereby causing the protrusion to pass through the jaw. container lid. 2. The container lid according to claim 1, wherein the projection gradually increases inwardly in the radial direction from the bottom in the axial direction to the top. 3. Claim No. 3, wherein the projection gradually increases inwardly in the radial direction from the front to the rear when viewed in the direction of rotation of the container lid when the container lid is attached to the container mouth. The container lid described in item 1 or 2. 4. The container lid according to any one of claims 1 to 3, wherein the upper surface of the protrusion is a flat surface extending substantially horizontally.