JPH0423801Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a metal cap with enhanced tamper-proof properties, that is, a tamper-proof mechanism.

(Prior Art) Conventionally, as a tamper-proof cap, one in which a weakened portion is provided below a threaded portion provided on a side wall portion of the cap (on the opposite side from the top plate portion of the cap) is known.

For example, Japanese Utility Model Publication No. 50-40732 describes a device in which a perforated weakened portion is provided on the lower side of a screw portion provided on the side wall of the cap (on the opposite side from the top plate of the cap). When the cap is opened, the weakened portion breaks and the upper part of the cap separates from the side wall below the weakened portion, making it clear that the cap has been opened once.

Furthermore, Japanese Utility Model Publication No. 58-43568 describes a weakened part such as a perforation in which at least one bridging part is provided below the screw part of the side wall of the cap, and a part below the perforation that is torn from the cap. A score in the axial direction is provided. Even if the cap is torn at the perforation, the lower part of the cap does not separate from the main body of the cap, but is connected in a ribbon shape to clearly show that the cap has been opened once.

(Problem to be Solved by the Invention) However, in the conventional cap as described above, when the weakened lower portion separates from the side wall of the cap, the remaining portion takes the form of a cap, so that the cap It is difficult to easily determine whether a product is virgin or not. Further, even if the weakened lower portion hangs down from the side wall of the cap, the same problem as described above occurs because the weakened lower portion can be easily removed from the cap.

In particular, it is difficult to say that conventional caps have sufficient tamper-proof properties, since it is up to a complete amateur to determine whether or not a cap is virgin.

Therefore, an object of the present invention is to provide a metal cap whose opening history can be clearly recognized at a glance.

(Means for Solving the Problems) The present invention consists of a top plate and a side wall that hangs down from the periphery of the top plate, and the side wall has a threaded portion that engages with a screw provided on the neck of the container. In the metal cap, the metal cap is provided with a screw region, an engagement region for engaging with a jaw formed on a container mouth neck located below the screw region, and a weakened region that breaks when the cap is opened. A large number of slits are provided between the weakened region and the screw region at predetermined intervals and aligned in the axial direction,
The cap is characterized in that the bridging portion between the slits becomes distorted when the cap is opened.

(Function) In other words, once the metal cap of the present invention is opened, the bridge portion between the slits aligned in the axial direction becomes distorted, and the axial alignment of the slits becomes distorted. Because of this collapse, the fact that the cap has been opened is clearly recognized at a glance, regardless of whether the lower part of the weakened area has separated from the side wall of the cap.

Moreover, once deformed, it is difficult to return to the original shape, so misuse can be completely prevented.

(Example) The present invention will be described below based on specific examples shown in the accompanying drawings.

In FIG. 1, which shows a partial side cross-section of the metal cap of the present invention, the cap consists of a top plate part 1 and a side wall part 2 depending from the periphery of the top plate part 1.

Further, on the inner surface side of the top plate portion 1, a liner 3 made of thermoplastic resin such as olefin resin is provided.

The cap itself is made of metal materials such as light metal steel plates such as aluminum, tinplate, galvanized steel plates, electrolytic chromic acid treated steel plates (tain-free steel), and aluminum plated steel plates. Among these, it is particularly desirable to be made of aluminum from the viewpoint of deformability, which will be described later.

In the cap of the present invention, a screw region 4 and an engagement region 5 are formed in the side wall portion 2. A perforation or score 6 is formed below the threaded region 4, and a score 7 for guiding tearing extends downward from the vicinity of the perforation or score 6.

A knurled groove 8 for gripping the cap is provided in the upper part of the side wall 2.

Referring to FIG. 2 showing the state in which this cap is applied to the container neck 1, the cap is attached to the container neck 1.
0 is embossed in a covered state, and the threaded area 4
is formed with a threaded portion 4a that engages with the threaded portion 11 of the container neck 10, and the engagement region 5 engages with the jaw 12 of the container neck 10. Furthermore, liner part 3
is in sealing engagement with the upper end 13 of the container neck 10.

Returning to FIG. 1 again, the metal cap of the present invention has a perforation or score of 6 and a threaded area of 4.
An important feature is that a plurality of slits 20 are provided at predetermined intervals and axially aligned in the area between.

That is, with reference to FIG. 3 showing the state of the metal cap of the present invention after opening, according to the present invention, by providing a large number of the slits 20, the torque at the time of opening the cap is reduced. The bridge portion 21 between these slits 20 is deformed, and the alignment of the slits 20 in the axial direction is lost.

Therefore, the perforation or the lower part 2 of score 6
Even if the cap 2 is completely separated from the side wall 2, the distorted shape described above can be recognized at a glance, making it easy to understand that the cap has been opened once. be.

It is desirable that these slits have the same shape and are aligned with the circumferential surface of the side wall portion 2 at regular intervals so that the deformation thereof can be easily recognized.

In addition, the slit 20 is easily deformed by the torque applied when opening the cap, and its alignment is disrupted.
As shown in the figure, the width m of the bridging portion 21 is equal to the width m of the slit 2
It is preferable that it is sufficiently thin with respect to the vertical length l of 0.

(Effect of the invention) Once the metal cap of the invention is opened, the bridging portion between the slits becomes distorted due to the torque at the time of opening. Regardless of whether or not it has been discontinued, the fact that it has been opened can be clearly recognized at a glance.

Moreover, once the bridge between the slits has become distorted, it is difficult to return it to its original shape, so it is completely possible to prevent malicious use of the bridge section by returning it to its original shape.

Further, in the present invention, since the slits are formed at predetermined intervals on the circumference of the skirt portion of the cap and aligned in the axial direction, the slits can be easily formed.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view of the cap of the present invention;
2 is a diagram showing the state in which the cap of FIG. 1 is used, FIG. 3 is a diagram showing the state of the cap of FIG. 1 after being opened, and FIG. 4 is a diagram showing the slit provided in the cap of the present invention. It is an enlarged view. DESCRIPTION OF SYMBOLS 1... Top plate part, 2... Side wall part, 3... Liner, 4... Thread area, 5... Engagement area, 6... Perforation or score, 20... Slit, 21... Bridge part .

Claims (1)

[Scope of utility model registration request] It consists of a top plate part and a side wall part hanging from the periphery of the top plate part, and the side wall part has a threaded area that engages with a threaded part provided on the container opening neck, and a container opening located below the threaded area. In a metal cap that is provided with an engagement region for engaging with a jaw portion formed on the neck and a weakened region that breaks when the cap is opened, the cap is provided with a predetermined interval between the weakened region and the screw region. A metal cap characterized by having a large number of slits aligned in the axial direction, and a bridging portion between these slits having a distorted shape when the cap is opened.