JPH08183547A - Connecting structure between container and container lid made of synthetic resin - Google Patents

Abstract

PURPOSE: To facilitate the separation of a cylindrical part of a container lid by a method wherein when a container is opened by relatively rotating the container and container lid made of a synthetic resin, the cylindrical part of the container lid is assuredly separated with a weakened part as the border, and at the bottom side of a neck part of a male thread on the outer periphery of the neck part of the container, protruding parts which are confronted in the diametrical direction are provided. CONSTITUTION: At a neck part 10 of a container, a plurality of ratchets are formed at the lower side on the neck part than a male thread 12 on the outer peripheral surface. At the same time, a pair of protruding parts 16, 18 being confronted to each other in the diametrical direction are formed. When the neck part 10 is closed by a container lid 30, the container lid 30 is rotated, and the neck part 10 and container lid 30 are engaged by making contact pieces 32... being formed on the internal surface of a pilferproof skirt part 37 which is connected to a main part 35 of the container lid 30 by a bridge (weakened part) 40 get over the contact surface 14A of the ratchet 14 and the protruding part 16, by the screwing between the male thread 12 and female thread 42. When the lid is opened, since a relative movement between the skirt part 37 and container is blocked, the major part 35 and skirt part 37 are separated by cutting the bridge 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for a container such as a beverage bottle and a synthetic resin container lid. More specifically, the invention relates to a structure in which the container and the synthetic resin container lid are rotated relative to each other. The present invention relates to a connection structure between a synthetic resin container lid and a container in which a tubular portion of the synthetic resin container lid is reliably separated with a weak portion as a boundary when the mouth / neck opening of the container is opened.

[0002]

2. Description of the Related Art Recently, as a container lid for closing a container such as a beverage bottle, a synthetic resin container lid having a pilfer-proof property for clearly indicating the fact of opening has come to be used. Well known.

This kind of container lid is provided with a closing wall for closing the mouth-neck opening of the container, and a tubular portion depending from the peripheral edge of the closing wall. A plurality of slits are formed at intervals in the axial direction along the entire circumferential direction at an intermediate portion in the axial direction of the tubular portion, and the tubular portion has a closed wall side as a main portion with the slit as a boundary. And the opposite side is the Pilfer proof hem. A female thread is formed on the inner surface of the main portion, and an abutting piece is provided so as to project on the inner surface of the pilfer proof hem.

In the container to which the above-mentioned container lid is applied, as shown in FIG. 6, a male thread formed on the outer peripheral surface of the mouth / neck portion 50 is screwed into the female thread. Further, on the outer peripheral surface of the mouth / neck portion 50, a plurality of locking pieces 52 are formed on the inner side of the mouth / neck portion with respect to the male thread, and the male thread and the female thread form the mouth / neck opening. The locking piece 52 is brought into contact with the abutting piece when relatively rotated in the opening direction.

Here, when the mouth / neck opening in the closed state is opened, the container lid is rotated in the opening direction. This allows
The female thread of the container lid moves relative to the male thread 50, and the container lid rises with rotation. At this time, the contact piece of the container lid is in contact with the locking piece 52 of the container, the rotation of the pilfer proof hem is blocked, and a twisting force acts on the tubular portion to cause the tubular portion to move. , The main part and the pilfer proof hem are separated, and the pilfer proof characteristic is exhibited.

[0006]

However, in the above-described conventional connecting structure of the container and the synthetic resin container lid, the regions A and B facing each other are provided in order to enable die cutting in the vertical direction of FIG. It was not possible to form the locking piece 52. Therefore, when the container lid is rotated to open the mouth-neck opening of the container, the pilfer proof hem elastically deforms particularly in the areas A and B, and the contact piece rides over the locking piece 52. There is a problem that it will end up. Therefore, a sufficient twisting force to separate the tubular portion cannot be applied to the tubular portion, and the tubular portion cannot be reliably separated.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is, therefore, when the container and the synthetic resin container lid are rotated relative to each other to open the mouth / neck opening of the container, the cylindrical portion of the synthetic resin container lid is fragile. (EN) Provided is a connecting structure of a container and a synthetic resin container lid that are reliably separated from each other.

[0008]

The present invention has been proposed in order to achieve the above object, and is characterized by the following points. That is, according to the present invention, a container body having a male thread on the outer peripheral surface of the mouth and neck and a plurality of locking portions located on the inner side of the mouth and neck of the male thread and the mouth and neck are closed. A closing wall, a tubular portion that hangs from the peripheral edge of the closing wall, a fragile portion formed along the circumferential direction at an axially intermediate portion of the tubular portion, and the closing wall rather than the fragile portion of the tubular portion. A state in which the female thread located on the side and engaging with the male thread and the male thread and the female thread are brought into contact with the locking portion when the male thread and the female thread are relatively rotationally moved in a direction of opening the mouth / neck opening. And a synthetic resin container lid having an abutting piece to be connected to the container and a synthetic resin container lid for connecting the container and the synthetic resin container lid, and the mouth neck portion of the male thread on the outer peripheral surface of the mouth neck portion. At least a pair of projecting portions are provided on the back side that face each other with a central angle of approximately 180 degrees and that project so as not to interfere with die cutting. The connecting structure of the container, wherein the plastic container closure is provided that is.

[0009]

In the structure for connecting the container and the synthetic resin container lid according to the present invention, the projecting portions which face each other at the central angle of about 180 degrees to the inner side of the mouth of the male screw on the outer peripheral surface of the mouth and neck of the container. Is provided.

As described above, in the present invention, the projecting portion is formed in the region which has not been conventionally formed, and in this region, elastic deformation of the pill-proof skirt of the synthetic resin container lid is suppressed, The pilfer proof skirt is held in a tubular shape. Therefore, when the synthetic resin container lid is rotated in the mouth / neck opening direction, the abutting pieces are prevented from climbing over the locking portions, and each abutting state is maintained, so that the tubular portion has a sufficient size. As a result, the tubular portion is reliably separated at the weakened portion. Further, in the present invention, the protruding portion for ensuring the separation of the tubular portion protrudes so as not to interfere with the die cutting, and there is no obstacle at the time of die cutting.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the container filled with soft drinks and the like is formed by a mold having an upper mold and a lower mold, and the male thread 12 shown in FIGS. I have it. The upper side of the mouth / neck portion 10 in FIG. 2 is an opening for filling contents, and the lower side of the mouth / neck portion 10 in FIG. 2 is integrated with a container body (not shown).

The mouth / neck portion 10 has a plurality of ratchet teeth 14 formed on the outer peripheral surface on the inner side of the mouth / neck portion (downward in FIG. 2) with respect to the male thread 12. This ratchet tooth 14
As shown in FIG. 1, a contact surface 14A extending in a state orthogonal to the outer peripheral surface of the mouth / neck portion 10 and an inclined portion 14B extending from the tip of the corresponding contact surface 14A are provided.

As shown in FIG. 1, three ratchet teeth 14 are provided at the upper left and lower right of FIG. 1 with a straight line L1 as a boundary, and each of the three ratchet teeth 14 is adjacent to the adjacent ratchet tooth. It is formed at a position where the central angle θ with 14 is 45 degrees. Further, a pair of protrusions 16 and 18 are formed on the outer periphery of the mouth / neck portion 10. Each protrusion 1
Reference numerals 6 and 18 are disposed at a position shifted by 45 degrees from the mating surface L2 of the upper mold and the lower mold, and face each other at a central angle of 180 degrees.

The protruding portions 16 and 18 are formed with curved surface portions 16A and 18A, respectively, which are convex outward in the radial direction of the mouth / neck portion 10. The curved surface portions 16A and 18A are provided with a container lid 30 which will be described later.
The contact piece 32 (see FIG. 4) is slid. The projecting portion 16 passes through the base portion 16B in FIG. 1 and is formed so that the curved surface portion 16A does not project to the left in FIG. 1 from the plane 22 orthogonal to the mating surface L2. The protruding portion 18 is formed such that the curved surface portion 18A does not protrude to the right in FIG. 1 from the flat surface 24 that passes through the base portion 18B of FIG. 1 of the protruding portion 18 and is orthogonal to the mating surface L2. There is. By forming the protrusions 16 and 18 in this manner, the protrusions 16 and 18 do not hinder the die cutting.

The container lid 30 for closing the mouth-neck opening of the container is made of a synthetic resin, and as shown in FIG. 3, has a closing wall 34 and a cylindrical portion 36 hanging from the peripheral edge of the closing wall 34. I have it. Rectangular slits 38 are formed in the axially intermediate portion of the tubular portion 36 along the entire circumference in the circumferential direction, and the slits 38 of the tubular portion 36 are located above the main portion 35. And the lower side is a pilfer proof skirt 37. The main portion 35 and the pilfer proof skirt portion 37 are connected by a bridge 40 as a fragile portion which is a boundary portion with the slit 38.

As shown in FIG. 5, the main portion 35 of the tubular portion 36 is formed with an internal thread 42 on its inner surface for engaging with the external thread 12. Further, as shown in FIGS. 4 and 5, the pilfer proof skirt portion 37 of the tubular portion 36 is in contact with the ratchet teeth 14 on the inner surface thereof, and when the container is opened, the pilfer proof skirt portion 37 and the container are separated from each other. A contact piece 32 that prevents relative rotation is formed. A plurality of the contact pieces 32 are provided over the entire circumferential direction of the pilfer proof skirt portion 37.

Here, when closing the mouth / neck opening with the container lid 30, the container lid 30 is made to correspond to the mouth / neck portion 10 of the container, and the container lid 30 is rotated in the direction of arrow C in FIG. As a result, the male thread 12 and the female thread 42 are screwed together, and the container lid 3
0 moves downward while rotating. At the time of this rotational movement, the abutment piece 32 moves the abutment surface 14A of the ratchet teeth 14,
The container lid 30 is elastically deformed outward in the radial direction of the container lid and rides over the ratchet teeth 14 and the protrusion 16, so that the container lid 30 is smoothly rotated downward, and the mouth / neck opening is closed.

To open the mouth / neck opening that has been closed, the container lid 30 is rotated in the opposite direction (direction of arrow D in FIG. 4). As a result, as shown in FIG. 5, the contact piece 32 and the ratchet tooth 14A are brought into contact with each other, and the relative movement between the pill-proof skirt 37 and the container is prevented. As a result, a torsional force acts on the axially intermediate portion of the tubular portion 36, the bridge 40 is cut, and the tubular portion 36 is separated into the main portion 35 and the pilfer proof skirt portion 37.

As described above, in this embodiment, the protrusions 16 and 18 are provided on the outer peripheral surface of the mouth and neck, and the protrusions 16 and 18 are provided.
18 Pilfer-proof skirt 37 inner surface (contact piece 32)
Are contacted, and the pilfer proof skirt portion 37 is held in a substantially tubular shape. Therefore, the contact piece 37 is the ratchet tooth 1
4 is prevented, and a sufficient twisting force can be applied to the tubular portion 36, so that the tubular portion 3
6 is reliably separated into a main part 35 and a pilfer proof skirt 37. Note that a plurality of pairs of protrusions may be provided.

[0020]

As described above, according to the present invention, the synthetic resin container is opened when the container and the synthetic resin container lid are relatively rotated to open the mouth / neck opening of the container. It is possible to provide a connecting structure of a container and a synthetic resin container lid in which the tubular portion of the lid is reliably separated from each other at the weakened portion.

[Brief description of drawings]

FIG. 1 is a view of a container to which a synthetic resin container lid of the present invention is screwed, as viewed from the mouth / neck opening side.

FIG. 2 is a side view of a mouth / neck portion of a container to which the synthetic resin container lid of the present invention is screwed.

FIG. 3 is a cross-sectional view of a synthetic resin container lid of the present invention.

FIG. 4 is a view of the synthetic resin container lid of the present invention viewed from its opening side.

FIG. 5 is a cross-sectional view showing a connection structure between a container according to the present invention and a synthetic resin container lid.

FIG. 6 is a view of a container to which a conventional synthetic resin container lid is screwed, as viewed from the mouth / neck opening side.

[Explanation of symbols]

 10 Mouth and neck part 12 Male thread 16 Projection part 32 Abutment piece 36 Cylindrical part 40 Bridge 42 Female thread

Claims (1)

[Claims] 1. A container main body having a male thread on the outer peripheral surface of the mouth and neck, and a plurality of locking portions positioned on the inner side of the mouth and neck of the male thread, and closing the mouth and neck. The closing wall, a tubular portion that hangs from the peripheral edge of the closing wall, a fragile portion that is formed along the circumferential direction at an axially intermediate portion of the tubular portion, and the fragile portion of the tubular portion is more than the fragile portion. A female thread located on the side of the closing wall and threadedly engaged with the male thread, and the locking section when the male thread and the female thread are relatively rotationally moved in a direction of releasing the mouth / neck opening. A connecting structure for connecting a container and a synthetic resin container lid, which connects a synthetic resin container lid having an abutting piece brought into contact with each other, wherein the male screw on the outer peripheral surface of the mouth-neck portion is At least a pair of protrusions that are on the inner side of the mouth and neck of the strip and that face each other at a central angle of about 180 degrees and that protrude without hindering die cutting. Connection structure of the container, characterized in that provided between the plastic container closure.