JP2003095297A - Tamper evident cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tamper evident cap designed such that a tamper evident ring part is not disengaged at the time of fixing a cap and the tamper evident ring part is easily disengaged at the time of removing of the cap from the vessel head. SOLUTION: The tamper evident cap is obtained by placing, on the tamper evident ring part 10, a screw-back blocking piece 16 retreating in contact with a detent part 23 of the vessel head 21 from a screw-in direction and latching in contact with the detent part 23 from a screw-back direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tamper-evidence cap having a tamper-evidence ring portion on a cap skirt portion.

[0002]

2. Description of the Related Art Conventionally, tamper evidence caps are
Generally, the cap and the tamper evidence ring part are molded by integral molding of plastic, and the cap and the tamper evidence ring part are generally connected by a bridge so that they can be easily torn. Met.

When the tamper-evidence cap is attached to the neck of the container and then removed, the tamper-evidence ring part is detached from the cap, and the contents of the container are opened from mischief as a means to prove that the cap has been opened. Since it is used for protection, it is necessary to easily attach the tamper-evidence ring portion to the container neck together with the cap so that the tamper-evident ring portion does not come off, and it is necessary to easily detach the cap from the cap when removing it from the container neck portion.

Further, the tamper-evidence ring part separated from the cap is engaged with a separation preventing protrusion provided on the container neck so that the dropout state can be clearly seen by being left on the container neck. It has been common to use a tamper-evidence ring part having a considerably larger outer shape than the cap skirt part so as not to fall off the neck part.

[0005]

Conventionally, in an automatic cap attaching device using a machine, etc., the tamper evidence ring portion is prevented from being detached when the cap is attached,
If the bridge is made fairly strong, the tamper-evidence ring portion does not come off when the cap is removed from the neck of the container, so there is considerable difficulty in removing the cap.

Further, if a means such as a reinforcing means that engages only in the screwing direction is provided at the connecting portion between the cap and the tamper evidence ring portion so as not to break the bridge, the cap and the tamper evidence ring portion will be separated. The integral molding process was considerably difficult.

Further, since the tamper-evidence ring portion projects outward from the cap skirt portion, there is a problem that the cap skirt portion becomes large as a whole tamper-evidence cap. Also, when the cap and the tamper evidence ring part are integrally molded with the same material, for example, it is difficult to make the cap and the tamper evidence ring part different colors, and since they are the same color, they are separated. At first glance, it was difficult to understand, and there were problems such as making it larger than the cap so that the tamper-evident ring could be easily identified, and providing a means for clarifying the detachment at the neck of the container.

[0008]

Therefore, a tamper-evidence cap according to the present invention abuts against the tamper-evidence ring portion against the detent portion of the neck of the container from the screwing direction and withdraws from the screwing direction. The present invention provides a tamper-evidence cap provided with a screw-return blocking piece that comes into contact with and stops.

According to the present invention, when the screw-back prevention piece provided in the tamper-evidence ring portion is screwed into the cap, it comes into contact with the detent portion of the container neck portion and retreats, so that smoothness is obtained without receiving resistance. It becomes difficult for the separating force to act on the connecting part between the cap and the tamper evidence ring part by overcoming the anti-rotation part, and the structure of the connecting part between the cap and the tamper evidence ring part can be easily torn up. In addition, it is possible to prevent the tamper-evidence ring portion from coming off when the cap is attached by the automatic cap attaching device or the like.

According to a second aspect of the present invention, in the tamper-evidence cap according to the first aspect, the screw-return blocking piece is fixed to the tamper-evident ring portion at the base portion, and the tip end side is elastically deformed. In addition, the protruding portion is provided so as to bend so that the middle portion of the screw return blocking piece abuts the rotation preventing portion of the container neck portion from the base side in the screwing direction and the tip portion abuts in the screw returning direction. The tamper evidence cap provided is provided.

According to the present invention, when the cap is screwed in, the middle portion of the screw return blocking piece, the base portion of which is fixed to the tamper evidence ring portion, comes into contact with the rotation preventing portion of the container neck portion, and the tip end side is elastically deformed. On the other hand, when the cap is unscrewed, it prevents the tamper-evidence ring part from rotating by contacting the detent part from the tip and acting like a support rod, and the connecting part is easily separated. Become.

Further, according to a third aspect of the present invention, in the tamper-evidence cap according to the first or second aspect, the screw return blocking piece is not located inside the inner peripheral portion of the cap skirt portion. The tamper-evidence cap provided on the. According to the present invention, when the cap is attached to the container neck, it is possible to prevent the screw-return blocking piece of the tamper-evidence ring portion from coming into contact with the threads of the container neck and the like, and after separating from the cap, It can be easily removed from the neck of the container to facilitate separate disposal from the container or cap.

According to a fourth aspect of the present invention, in the tamper-evidence cap according to any one of the first to third aspects, a plastic tamper-evidence ring portion is detachably insert-molded on the cap. The present invention provides a tamper-evidence cap. According to the present invention, the tamper-evidence ring portion can be easily integrally formed on the caps made of different materials.

According to a fifth aspect of the present invention, in the tamper-evidence cap according to the fourth aspect, a plastic tamper-evidence ring portion made of a material different from the cap is provided on the plastic cap. A tamper-evidence cap formed by insert molding is provided. According to the present invention, the cap and the tamper-evidence ring portion can be colored differently to make the existence of the tamper-evidence ring portion clear, and the same material may be welded, but because of different materials The cap and the tamper-evident ring part can be connected to each other in a state where they can be easily separated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. In the figure, reference numeral 1 denotes a cap, which is a screw cap in this embodiment, and as shown in FIGS. 9 to 11, a female screw 2 screwed onto a male screw portion 22 of a neck portion 21 of a container 20 is attached to a cap inner cylinder portion. It is provided. As shown in FIG. 2, the non-slip concave-convex surface 3 is integrally formed on the outer cap portion of the cap, and the tamper-evidence ring portion 10 is formed on the lower end edge portion 5 of the skirt portion 4 by insert molding. It is molded so that it can be separated.

As shown in FIG. 3, FIG. 6 or FIG. 8, on the inner peripheral surface 15 of the tamper-evidence ring portion 10, there are provided screw return blocking pieces 16 made of elastically deformable projections at equal intervals. In the illustrated embodiment, the screw return preventing pieces 16 are provided at eight equal intervals. Screw return prevention piece 16
As shown in FIGS. 9 to 11, when the cap 1 with the tamper-evidence ring portion 10 is screwed into the container neck portion 21, the smooth surface 17 comes into contact with the rotation preventing portion 23 of the container neck portion 21 from the screwing direction and bends. The stopper tip portion 18 is provided so as to abut and latch the screw in the screw return direction.

That is, the tamper-evidence ring portion 10 is provided with a base portion 19 of the screw return preventing piece 16 fixed thereto, and a tip portion 18 side thereof is provided so as to project so as to elastically deform and bend.
In the protruding direction, the intermediate portion of the screw return blocking piece 16 abuts the rotation preventing portion 23 of the container neck portion 21 from the base 19 side in the screwing direction, and the tip portion 18 in the screw returning direction.
Are abutted against each other.

Therefore, when the cap is screwed in, the smooth surface 17 of the intermediate portion of the screw return preventing piece 16 is prevented from rotating.
1 and elastically deforms and bends and easily escapes.
As described in 0, the tamper-evidence cap 1 can be lightly attached to the neck of the container, and conversely, when the cap screw is returned, the stopper tip 1 of the screw return blocking piece 16
8 abuts against the rotation preventing portion 23 and hooks it like a support rod to prevent rotation of the tamper evidence ring portion 10 in the screw return direction, and as shown in FIG. 1 leaving the container neck 21
Only the screw can be unscrewed, removed and removed.

In the case of the illustrated embodiment, the separated tamper-evidence ring portion 10 drops to the container shoulder portion 24, and when the cap 1 is closed again, the tamper-evidence ring portion 10 is left between the cap 1 and the tamper evidence ring portion 10. A gap is created,
The tamper-evident ring portion 10 is constructed so that the detached state can be clearly understood. It is preferable that the screw return preventing piece 16 is formed into an arc shape as shown in the illustrated embodiment so as to smoothly contact the rotation preventing portion 23 at the time of screwing and easily bend.

Further, as shown in FIG. 3, by providing the screw return preventing piece 16 so as to fit within the inner circumference of the lower end edge portion 5 of the cap skirt portion, as shown in FIGS. 9 and 10. , Tamper evidence cap 1 to container neck 2
The small tamper-evidence ring portion 10 whose outer shape is almost the same as that of the skirt portion 4 can be configured so as not to come into contact with the male screw portion 22 or the like when it is mounted on 1.

In the case of this embodiment, the cap 1 is previously integrally formed by injection molding of polypropylene or the like, and the lower end edge 5 of the skirt portion 4 of the cap 1 is a slippery uneven surface 3
As shown in FIG. 5, insert connecting portions 6 composed of concave portions are provided at equal intervals on the lower end edge portion 5 thereof so as to project slightly outward and have a thickness. In the embodiment shown in FIG. 5, the insert connecting portion 6 includes the screw return blocking piece 16
It is provided at eight locations at equal intervals in the vicinity of.

The tamper-evidence ring portion 10 which is integrally insert-molded with the skirt portion 4 of the cap 1 has a plastic insert-molding connecting portion 11 which is filled and molded in the insert connecting portion 6 through a mold. It is equipped as one.

Therefore, according to the shape of the insert connecting portion 6 on the cap side, if the insert connecting portion 6 is a concave portion as in the illustrated embodiment,
If the insert connecting portion 6 is formed into a convex shape that fits into the concave portion, and the insert connecting portion 6 is formed of a convex portion contrary to the illustrated embodiment, the convex portion is formed into a concave shape that fits. Becomes

In the case of the embodiment, the insert-molded connecting portion 11 has the insert in the screwing direction so that it can be integrally rotated in the screwing direction of the cap 1 into the container neck, as shown in FIG. 7 or 8. The stopper portion 12 is provided so as to be hooked on the connecting portion 6, and the taper portion 13 is pulled out from the insert connecting portion 6 in the screw return direction.

The material of the tamper-evidence ring portion 10 may be the same resin as the cap 1, for example, polypropylene. However, when the same resin is used, the joint portion or the connecting portion is likely to be welded at the time of molding and is difficult to separate. Therefore, it may be necessary to make the joint portion and the joint portion shallow and small.

Therefore, when the cap is polypropylene, it is preferable to prevent welding by using a different resin such as polyethylene for the tamper evidence ring portion. The shape, the connection depth, the installation location, the number of installations, etc. of the insert connecting portion 6 and the insert molding connecting portion 11 may be determined by ordinary technical means in consideration of the material of the cap or the tamper evidence ring portion 10. It is possible to make an appropriate experiment and select.

Further, in the case of the embodiment of FIG. 8, the insert molding connecting portion 11 is provided so as to project along the inner circumferential portion of the tamper evidence ring portion 10, and the outer circle of the tamper evidence ring portion 10 is provided. The upper surface 14 of the peripheral portion is configured to contact the lower end edge portion 6 of the cap skirt portion.

Incidentally, the screw return preventing piece 16 according to the present invention.
Is not limited to the tamper-evidence ring portion 10 that is easily separated into the cap 1 by insert molding, but should be used for a normal tamper-evidence ring portion that is connected through a bridge by conventionally known integral molding. Of course, you can

[0029]

As described above, according to the tamper-evidence cap of the present invention, the tamper-evidence ring portion comes into contact with the detent portion of the container neck portion from the screwing direction to retreat, and is pushed from the screw returning direction. By having a screw return blocking piece that comes into contact with and stops, when the cap is screwed in, the screw return preventing piece provided on the tamper evidence ring portion abuts against the rotation preventing portion of the container neck and retracts. Therefore, it smoothly overcomes the anti-rotation part without receiving resistance, and it becomes difficult for the separating force to act on the connection part between the cap and the tamper evidence ring part, and the structure of the connection part between the cap and the tamper evidence ring part. Can be easily split into pieces and separated, and the resistance is not Less because the tamper evident ring portion is effective that can be made to hardly detached.

According to a second aspect of the present invention, in the tamper-evidence cap according to the first aspect, the screw-return blocking piece is fixed to the tamper-evident ring portion at the base portion, and the tip end side is elastically deformed. In addition, the protruding portion is provided so as to bend so that the middle portion of the screw return blocking piece abuts the rotation preventing portion of the container neck portion from the base side in the screwing direction and the tip portion abuts in the screw returning direction. When the cap is screwed in, the middle part of the screw-return blocking piece whose base is fixed to the tamper-evident ring part comes into contact with the detent part of the container neck, and the tip side elastically deforms when the cap is screwed in. While it has the effect of avoiding bending, when the cap is unscrewed, it comes into contact with the anti-rotation part from the tip and acts like a support rod to prevent tamper evidence. To prevent rotation of the grayed portion, it may become effective in connecting portion is easily separated.

Further, according to the present invention, as described in claim 3, in the tamper-evidence cap according to claim 1 or 2, the screw-return blocking piece is not located inside the inner peripheral portion of the cap skirt portion. By having the configuration provided in the above, when the cap is mounted on the container neck, it is possible to prevent the screw return blocking piece of the tamper evidence ring part from abutting on the thread of the container neck and the like. After being separated from the container, there is an effect that it can be easily removed from the neck of the container to facilitate the separate disposal from the container or the cap.

According to a fourth aspect of the present invention, in the tamper-evidence cap according to any one of the first to third aspects, a plastic tamper-evidence ring part is detachably insert-molded on the cap. With such a configuration, there is an effect that the tamper-evidence ring portion can be easily integrally formed on the cap made of a different material.

According to a fifth aspect of the present invention, in the tamper-evidence cap according to the fourth aspect, the plastic cap has a plastic tamper-evidence ring portion made of a material different from that of the cap. By having a structure formed by insert molding, it is possible to make the cap and the tamper-evidence ring part different colors to clarify the existence of the tamper-evidence ring part, and the same material may be welded, Since different materials are used, it is possible to prevent welding and to connect the cap and the tamper-evident ring portion in an easily separable state.

[Brief description of drawings]

FIG. 1 is a central longitudinal front view showing an embodiment of the present invention by longitudinally cutting it from the center.

FIG. 2 is a schematic plan view thereof.

FIG. 3 is a schematic bottom view thereof.

FIG. 4 is a central longitudinal front view of the main part.

5 is a schematic bottom view of FIG.

FIG. 6 is a schematic plan view of a main part of FIG.

FIG. 7 is a front view in vertical section of FIG.

FIG. 8 is an enlarged perspective view of a main part thereof.

FIG. 9 is a schematic explanatory view showing a usage mode of the cap of the present invention.

FIG. 10 is a schematic explanatory view showing another usage mode of the cap of the present invention.

FIG. 11 is a schematic explanatory view showing another usage mode of the cap of the present invention.

[Explanation of symbols]

1 cap 2 Female thread 3 Anti-slip uneven surface 4 Skirt 5 bottom edge 6 Insert connection part 10 Tamper Evidence Ring Department 11 Insert molding connection 12 Stopper 13 Tapered part 14 Upper surface 15 Inner surface 16 Screw return blocking piece 17 Smooth side 18 Stopper tip 19 base 20 containers 21 container neck 22 Male thread 23 Detent

Claims (5)

[Claims] 1. A tamper-evidence cap comprising a tamper-evidence ring portion provided with a screw-return blocking piece that abuts against the rotation preventing portion of the container neck from the screw-in direction to retreat, and abuts from the screw-returning direction to stop. . 2. The tamper-evidence cap according to claim 1, wherein the tamper-evidence ring portion is provided with a screw-return prevention piece so that the base portion is fixed to the tamper-evidence ring portion so that the distal end portion is elastically deformed and bent. A tamper-evidence cap provided such that an intermediate portion of the screw-return blocking piece comes into contact with a rotation-stop portion of the container neck portion from the base side in the screw-in direction, and a tip portion thereof comes into contact in the screw-return direction. 3. The tamper-evidence cap according to claim 1, wherein the screw-return blocking piece is provided so as not to be located inside the inner peripheral portion of the cap skirt portion. 4. The tamper-evidence cap according to claim 1, wherein a plastic tamper-evidence ring portion is insert-molded into the cap in a detachable manner. 5. The tamper evidence cap according to claim 4, wherein a plastic tamper evidence ring portion made of a material different from the cap is insert-molded on the plastic cap.