JPS6219553Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Technical Field" This invention relates to a synthetic resin cap equipped with a pilfer-proof band.

"Prior art and its problems" Generally, metal or synthetic resin caps that seal the mouth of a bottle include a member that allows you to confirm whether the bottle is unopened or opened. is provided. Specifically, when unopened, the cap body is covered with a thin synthetic resin, and when opened, the synthetic resin covering the cap body is peeled off to open the cap, or unopened caps. Sometimes, a so-called Hilfer-proof band that engages with a step formed on the outer peripheral surface near the bottle opening is attached to the cap body through a removable cut line, and when the bottle is opened, this Hilfer-proof band is removed. Some are known to be cut along the cut line.

Synthetic resin caps equipped with the latter pilfer-proof band are disclosed in Japanese Patent Application Laid-open No. 58
There are things like -30949. This cap is provided with an engaging portion consisting of a plurality of tongues that engage with a step formed on the outer periphery of the bottle mouth. After passing through the stepped portion, it bulges inward and engages with the stepped portion.

However, since the above-mentioned tongue piece is easily deformed in shape, the locking force against the stepped portion of the bottle mouth is weak, and the tongue piece has the drawback of lacking reliability.

``Means for Solving the Problem'' Therefore, in the case of the synthetic resin cap of this invention, the inner surface of the pilfer-proof band has an arc-shaped cross section, and the lower end slopes gradually upward toward the inside of the cap. The above problem was solved by providing a plurality of engaging portions.

``Function'' During capping, the engaging part gradually enters the gap between the pilfer-proof band and the stepped part of the bottle mouth from its outer part, and gradually moves laterally from its base end to the side opposite to the direction of rotation of the cap. It is deflected in the direction.

This engaging portion is easily bent and deformed at an arbitrary position in response to a force from the lateral direction. Therefore, during capping, the engaging portion easily climbs over the stepped portion of the bottle mouth and engages below the stepped portion.

On the other hand, the engaging portion, which is formed in an arc-shaped cross section, does not have the load concentrated in one area, so it does not bend when subjected to a load from above when it engages with the stepped portion of the bottle mouth when opening, and the pill-proof band is securely separated when opening.

"Example" The synthetic resin cap of this invention will be described in detail below with reference to Examples.

1 to 3 are views showing an embodiment of the synthetic resin cap of this invention, in which reference numeral A indicates a cap and reference numeral B indicates a bottle. The cap A consists of a disk-shaped top plate 1 and a cylindrical part 2 that hangs downward from the peripheral edge of the top plate 1. A seal portion 3 is formed on the inner peripheral surface of the top plate 1 to press the upper end of the bottle mouth of the bottle B, so that the bottle B can be reliably sealed. On the other hand, a female thread 5 is formed on the inner circumferential surface of the cylindrical portion 2 and is screwed into a male thread 4 formed on the bottle B.

The lower part of this cylindrical part 2 has a score line 8 in the circumferential direction.
(separable part) is formed, and the lower part thereof is used as a pilfer-proof band 7. This pilfer-proof band 7 is formed thinner than the upper part of the cylinder part 2. At the lower part of the inner circumferential surface of this pilfer-proof band 7, engaging parts 11, 11, .
are formed at appropriate intervals in the circumferential direction.
The engaging portions 11, 11, . . . have an arcuate cross section, and the overall shape is approximately semi-cylindrical. The engaging portions 11 are provided so as to protrude inward in the radial direction of the pilfer-proof band 7 and open in the axial direction of the cap A. The lower end portions of the engaging portions 11, 11, . . . face inward in the radial direction of the pilfer-proof band 7 and are gradually inclined upward. On the other hand, the upper end of the engaging portion 11 is formed substantially horizontally. Further, the engaging portions 11 are formed thin so as to have flexibility. As shown in FIG. 3, when the cap body A is screwed onto the bottle B, the engaging portions 11 pass through the stepped portion 10 in a crushed state, and after passing, are restored and engaged with the stepped portion. It's getting old.

In the cap A of this example, protrusions 6 and 9 are formed on the inner circumferential surface of the cylindrical portion 2 so as to sandwich a score line 8 therebetween. These protrusions 6 and 9 are for precisely aligning the central axis of the attached cap A with the central axis of the bottle mouth, and are formed over the entire circumference of the inner peripheral surface.

Next, the function of the synthetic resin cap of this invention will be explained using the above embodiment as an example.

First, when the cap A of this invention is screwed onto the mouth (bottle mouth) of the bottle B, the lower end of the engaging part 11 provided on the pilfer-proof band 7 touches the stepped part 10 of the bottle mouth. come into contact with Then, the engaging portion 11...
Since the lower end is gradually inclined upward toward the inside of the cap, the outer part gradually enters the gap between the pilfer-proof band 7 and the stepped part 10, and the engaging part 11 is formed at its base. Starting from the end, the cap is gradually bent in the direction opposite to the direction of rotation of the cap A. Then, when the cap A is screwed deeper into the bottle mouth, the engaging parts 11 ride on the stepped part 10 of the bottle mouth, as shown in FIG. At this time, each of the engaging parts 11 whose base ends are bent in the same direction is bent at any position in its cross section, but in the case of the cap of this invention, the engaging parts 11... 11...
is formed to have an arcuate cross section, and the engaging portions 11...
Since the cap A can be bent at any position in its cross section, the center axis of the cap A and the center axis of the bottle mouth are misaligned, and the cap can be made in a state where the gap between the pilfer-proof band 7 and the bottle mouth step 10 is uneven. Even in such a case, the engaging portions 11 of the cap A can easily be bent at arbitrary positions depending on the condition to easily get over the stepped portion 10 of the bottle mouth.

When removing the cap A of this invention attached to the bottle mouth as described above, when the cap A is raised, the upper end of the engaging part 11 of the cap A comes into contact with the lower end of the bottle mouth stepped part 10. To prevent the portion of the pilfer-proof band 7 from rising. At this time, since both ends of the engaging part 11 of the cap A of this invention are connected to the pilfer-proof band, it is difficult to buckle, and it is securely engaged with the bottle mouth stepped part 10 to securely engage the pilfer-proof band 7. This will prevent the rise of
In addition, in this case, in the cap of this invention, the engaging portions 11 are formed in an arcuate cross section, and the engaging portions 11 are not bent from a portion thereof, so that the bottle opening step portion 10 is not bent. The locking is secure.
In other words, if the engaging part is formed in a V-shaped cross section, the load will concentrate on the corner and it will easily bend from the corner, making it difficult to engage with the bottle opening step. The locking of the joint becomes uncertain. In contrast, in the cap of this invention, the engaging portion 11 is formed to have an arcuate cross section, so the load is applied to the engaging portion 11 in a distributed manner, making it difficult for the engaging portion 11 to bend. Therefore, the locking to the bottle opening stepped portion 10 becomes reliable. Then, when the cap is further raised in this state, the score line 8 is cut,
The pilfer-proof band 7 is separated from the cylindrical portion 2.

In addition, in the case of cap A in this example, the cylindrical portion 2
The protrusions 6 and 9 formed on the inner surface of the bottle are close to the bottle opening step 10 and regulate the position of the installed cap A so that the bottle opening and the center axis coincide with each other. pilfer proof band 7
This prevents unevenness of the gap formed between the bottle opening and the stepped portion 10 of the bottle mouth. Therefore, in the case of the cap of this example, all the engaging parts 11 provided on the pilfer-proof band 7 reliably come into contact with the bottle mouth stepped part 10, and the hinge (cutting of the pilfer-proof band) This prevents the trouble in which the pilfer-proof band is not completely removed and the pilfer-proof band comes off together with the cap body from the bottle opening step.

"Effects of the invention" In the synthetic resin cap of this invention having the configuration described above, the engaging part provided on the pilfer-proof band is formed in an arcuate cross section. It deforms easily in response to lateral forces and easily climbs over the bottle opening step when the cap is installed. Therefore, with the cap of this invention, no unreasonable force is applied to the cut line when the cap is attached, and the pilfer-proof band will not be separated when the cap is attached.

In addition, in the case of the cap of this invention, the engaging part is formed in an arcuate shape in cross section, so it is difficult to deform due to force from above, so the engaging part is securely attached to the stepped part of the bottle mouth when opening the cap. This ensures that the pilfer-proof band is securely cut when opening the cap.

Therefore, according to this invention, it is possible to provide a highly reliable synthetic resin cap that can be attached to the bottle mouth with a high yield and has excellent pilfer-proof properties, which solves the two problems at the same time. can.

In addition, in the case of the cap of this invention, the engaging portion is formed in an arcuate shape in cross section, and is difficult to deform when it engages with the bottle mouth step (that is, against vertical force). The wall thickness of the engaging part can be made thinner so that it can be easily deformed against lateral forces, so that the engaging part can more easily get over the bottle mouth stepped part when installed. Furthermore, since the engaging part of the cap of this invention can be reliably locked to the bottle opening step as described above, the inward protrusion of the engaging part can be reduced so that the engaging part can be attached to the bottle opening step when the cap is installed. This allows the cap to be easily climbed over, further improving the ease of attaching the cap.

Therefore, according to this invention, it is possible to provide a pill-proof cap that is extremely easy to wear.

[Brief explanation of the drawing]

Figures 1 to 3 all show an embodiment of the synthetic resin cap of this invention, with Figure 1 being a partial cross-sectional view showing the state in which it is screwed onto a bottle, and Figure 2 being FIG. 1 is a sectional view taken along the line in FIG. 1, and FIG. 3 is a sectional view showing a state in which an engaging portion passes through a stepped portion. 7... Pilf-proof band, 8... Cut line, (separable part), 10... Stepped part, 11... Engaging part, A... Cap main body.

Claims (1)

[Claims for Utility Model Registration] Consisting of a top plate and a cylindrical part that hangs down from the peripheral edge of the top plate, a cut line extending in the circumferential direction is formed in the lower part of the cylindrical part, and the lower part of the cylindrical part is a pilfer-proof band. The cap made of synthetic resin is characterized in that the inner surface of the pilfer-proof band is provided with a plurality of engaging portions each having an arcuate cross section and whose lower end gradually slopes upward toward the inside of the cap. Synthetic resin cap.