JPS636046Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pilfer-proof metal cap, and more particularly, to a safe pilfer-proof metal cap that does not cause injury to hands or fingers when opening the cap.

In conventional pilfer-proof metal caps, the upper part of the skirt part, where the threaded part is formed, and the lower part, which becomes the pilfer-proof band, are formed by a plurality of bridging parts of the width span provided between the score lines. They were connected in a so-called perforation pattern. Therefore, there is a problem in that when or after the cap is opened, the cut bridge portion protrudes between the cut lines and easily injures hands and fingers. Furthermore, in the sealed state, there was a sanitary problem in that dust, dust, etc. that entered through the gap between the score lines adhered to the container opening. Further, since a plurality of bridge portions are cut by torsional force, there is a problem in that the opening torque is unstable.

In contrast, a pilfer-proof metal cap has been proposed in which the upper part and the lower part are connected by an annular, easily cut, thin score part. In this case, the above problem is unlikely to occur, but the upward tension applied to the upper part due to thread formation during capping, and the tightening of the pilfer-proof band in the lower part to the flange of the container mouth. Due to the downward tension exerted on the lower part due to this, a problem arises in that the score part is easily cut during corking. If the score part is made thicker, the above-mentioned problem of being easily cut will be less likely to occur, but in this case, the score part will be difficult to break when opening the cap, resulting in a problem that it will be difficult to open the cap.

The present invention aims to solve the problems of the prior art described above.

In order to achieve the above object, the present invention provides a pilf-proof metal cap whose skirt part has an upper part where a threaded part is formed and a lower part which becomes a pilf-proof band, the upper part and the lower part being cut off. An upper bead is formed along the score at the lower end of the upper part, and a lower bead is formed at the upper end of the lower part along the score. part is formed,
The present invention provides a pilfer-proof metal cap characterized in that an annular thin wall portion that is difficult to cut is formed at the top of the upper bead portion and the lower bead portion.

The present invention will be described below with reference to the drawings which are examples.

In FIG. 1, reference numeral 1 denotes a so-called roll-on type pilfer-proof metal cap (hereinafter referred to as the cap), which includes a top plate 2 and a shell 4 having a skirt portion 3 hanging from the peripheral edge of the top plate 2. It is better than gasket 5. The shell 4 is formed from a metal plate such as an aluminum (alloy) thin plate. The skirt portion 3 includes an upper portion 7 having a short cylindrical portion 7a on which a threaded portion 6 (see FIG. 3) is to be formed by a thread forming roll (not shown) during capping, and a pilf-proof band. It has a lower part 8. An annular upper bead portion 7b that projects outward is formed at the lower end of the upper portion 7, and an annular lower bead portion 8a that projects outward is formed at the upper end of the lower portion 8. .

Along the outer periphery of the lowest part of the recess that forms the boundary between the upper bead part 7b and the lower bead part 8a, there is a substantially annular shape (in other words, it is not completely annular along the entire circumference, but has an interrupted part 1 in one part).
An easy-to-cut score 9 (with 5) is formed, and the upper part 7 and the lower part 8 are defined by the score 9. The score portion 9 is not formed in the interrupted portion 15 (for example, the length in the circumferential direction is about 2 mm), and a small hole 13 (described later) is formed on the left side of the interrupted portion 15 in FIG. Also, the upper bead part 7
Annular thin-walled portions 10 and 11, which are difficult to cut, are formed on the inner surface of the top portion of the bead portion b and the lower bead portion 8a, respectively.

As shown in FIG. 2, circumferential recesses 9a, 10a and 11a each having a trapezoidal cross-section are formed in the score portion 9 and the thin-walled portions 10 and 11, respectively, and the opening angles of the side wall surfaces thereof are θ ₁ and θ. ₂ and θ ₃ are both, for example, 50 to 60 degrees.

The remaining thickness _t2 of the score part 9 is 1/ of the original thickness t of the shell 4.
smaller than 2 (shell 4 is made of aluminum,
For example, if the original thickness t is 0.23 mm, the residual thickness t ₂ is 0.09
mm) and the width of the bottom of the recess 9a.
W ₂ is also set small, for example, 0.10 to 0.15 mm, so that the score portion 9 can be easily cut by the twisting force when opening the package.

On the other hand, the remaining thicknesses t ₁ and t ₃ of the thin parts 10 and 11 are 1/2 or more of the original thickness of the shell 4 (if the original thickness t is 0.23 mm, for example, the remaining thicknesses t 1 and t ₃ are both 0.12 to 0.18 mm). ), and the width of the bottom of the recesses 10a and 11a
w ₁ and w ₃ are also set relatively large, for example, 0.2 to 0.3 mm, so that they are difficult to break due to twisting force when opening the package, and are designed to at least not break before the score part 9. The upper bead portion 7b and the lower bead portion 8a are formed so as to be relatively easy to expand in the axial direction due to the axial force.

The lower part 8 has a weakened part 12 (for example, made of a score, which has a residual thickness of about 0.15 mm when the original thickness of the shell 4 is 0.23 mm) extending in the axial direction (which may be slightly inclined with respect to the axial direction). ) are formed at least one small hole 13 (for example, 0.5 mm×
1.5mm) is formed.

Figure 3 shows cap 1 as a container (e.g. glass bottle).
This figure shows the state after the mouth part 14 of the skirt part 3 is plugged, and a threaded part 6 is formed in the part corresponding to the short cylindrical part 7a of the skirt part 3 by a thread forming roll during plugging. Further, the lower end portion of the lower portion 8 is wound around the jaw portion 14a of the container mouth portion 14 to form a seamed portion 8b.

During the above-mentioned plugging, tension directed upward in the axial direction due to the formation of the threaded portion 6 and tension directed downward in the axial direction due to the formation of the seaming portion 8b are applied to the score portion 9, resulting in cutting in the axial direction. Force acts. However, in the upper bead portion 7b in which the thin wall portion 10 is formed, the tension directed upward in the axial direction bends the thin wall portion 10 so that the upper bead portion 7b extends in the axial direction, and the angle θ ₁ is opened. is alleviated. The downward tension is relieved by the lower bead portion 8a in which the thin wall portion 11 is formed in the same manner. Therefore, the score portion 9 is prevented from being cut during capping.

When opening the cap, a strong frictional force acts between the jaw part 14a and the seaming part 8b at the initial stage when the upper part 7 is rotated by the fingers, so that the lower part 8 cannot follow the rotation and the mouth part Cutting of the score portion 9 begins from the left side of the mouth portion 13 using point 13 as a starting point, and the weakened portion 12 is cut during or after cutting, and the lower portion 8 opens. Even in this state, the lower part 8 is connected to the upper part 7 at the interrupted part 15, so the upper part 7
By continuing to rotate the lower part 8, the upper part 7
It can be easily removed from the container opening 14 together with the container. Since the score portion 9 cuts, pilf-proof properties are ensured.

The present invention is not limited to the above embodiments; for example, the weakened portion 12 may not necessarily be provided. In this case, the interruption part 15 is not provided either, and the lower part 8 remains in its original position in the container mouth part 14 after opening. Further, the score portion 9 may be formed on the inner surface of the shell. Furthermore, the thin portions 10, 11 may be formed on the outer surface of the shell.

The pill-proof cap of the present invention has a score section that is cut when opening the cap, so unlike the conventional perforated cut section, the cap has no protruding parts and is smooth, making it easy for the hand to slide when opening. Even if you touch the cut part, it is safe because there is almost no risk of injury to your hands or fingers, and it has the advantage that the opening torque is stable. Furthermore, there is a small possibility that dust or the like will enter the opening of the container (the small hole 13 is very small, so even if the small hole 13 is provided, there is very little chance of dust or the like entering), and it has the advantage of being hygienic.

Furthermore, since the score part is formed at the boundary between the thin-walled upper bead part and the lower bead part, the tension in the axial direction that is applied during capping is alleviated, and there is no risk of the score part breaking during capping. It has the effect that there is no

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a cap that is an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional view of the main part of section A in Fig. 1, and Fig. 3 shows the cap of Fig. 1 as a container opening. FIG. 3 is a partially cutaway front view showing a sealed state. 1...Pilf-proof metal cap, 6...
Threaded part, 7... upper part, 7b... upper bead part,
8... Lower part, 8a... Lower bead part, 9... Score part, 10, 11... Thin wall part.

Claims (1)

[Scope of utility model registration request] A pilf-proof metal cap having an upper part where a threaded part is formed and a lower part which becomes a pilf-proof band in the skirt part, and the upper part and the lower part are formed by a substantially annular score part that is easy to cut. An upper bead portion is formed along the score portion at the lower end of the upper portion, a lower bead portion is formed along the score portion at the upper end of the lower portion, and the upper bead portion is formed at the upper end portion of the lower portion along the score portion. A pilf-proof metal cap characterized in that a thin annular portion that is difficult to cut is formed at the top of the bead portion and the lower bead portion.