JPH0858817A - Combination of container and cover - Google Patents

Abstract

PURPOSE: To keep a bridging part unbroken, which is provided on a peripheral weak line formed on a skirt wall of a cover, when the cover is fitted to a mouth-neck part of a container and to easily and surely break it when the mouth-neck part of the container is opened. CONSTITUTION: A ratchet claw projected upward is formed on a mouth-neck part of a container. A plurality of projected pieces 42 are formed on an inner peripheral surface of a skirt wall of a cover so as to be spaced at intervals in a peripheral direction. A part of the projected piece 42 forms a bridging part 54. A peripheral weak line 28 is formed by cutting the skirt wall. The lower part of the projected piece 42 forms a ratchet piece 50 operated in conjunction with the ratchet claw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tamper-evidence characteristics (characteristics in which when a mischief such as opening a container and mixing foreign matter into the contents is added, a trace of the mischief is added. ) With a container and a lid.

[0002]

2. Description of the Related Art As a combination of a container having a tamper-evidence characteristic and a lid, Japanese Patent Publication No. 43-6198 and Japanese Utility Model Publication No. 56-31559 disclose a combination of a container having a ratchet mechanism and a lid. Is disclosed. The container can be made of glass or a suitable synthetic resin, and the lid can be made of a suitable synthetic resin.

In the container in the above combination, a plurality of ratchet pawls are formed on the outer peripheral surface of the mouth and neck together with the male screw thread. The plurality of ratchet pawls are circumferentially spaced below the male thread. Each of the ratchet pawls is projected outward in the radial direction from the outer peripheral surface of the mouth and neck, and when the lid is attached to the mouth and neck of the container (more specifically, the male screw of the mouth and neck and the female screw of the lid are attached). (When screwing with the strip), when viewed in the direction of relative rotation of the container with respect to the lid, a gentle front surface extending obliquely outward in the radial direction toward the rear, and a steep rear surface extending outward in the radial direction. Have.

The lid in the above combination includes a top wall and a tubular skirt wall depending from the top wall. A circumferential weakening line extending in the circumferential direction is formed on the skirt wall, and the skirt wall is divided into a main part above the circumferential weakening line and a tamper-evidence hem below the circumferential weakening line. There is. The circumferential weakening line is composed of, for example, a plurality of slits (cutting grooves) extending in the circumferential direction at intervals in the circumferential direction, and bridging portions left between the slits. On the inner peripheral surface of the main part of the skirt wall, a female thread is formed which is screwed into a male thread on the mouth and neck of the container. On the inner peripheral surface of the tamper-evident skirt, a plurality of ratchet pieces that cooperate with the ratchet pawls in the mouth and neck of the container are formed at intervals in the circumferential direction. Each of the ratchet pieces is projected inward in the radial direction from the inner peripheral surface of the tamper-evidence skirt, and is viewed in the relative rotation direction of the lid with respect to the container when the lid is attached to the mouth and neck of the container. , A gentle front surface extending inwardly in a radial direction toward the rear, and a steep rear surface extending inward in the radial direction.

When the male thread on the mouth and neck of the container and the female thread on the lid are screwed together and the lid is attached to the mouth and neck of the container to seal the mouth and neck, it is formed on the mouth and neck. The tamper-evidence skirt is elastically displaced outward in the radial direction by the mutual guiding action of the gradual front surface of the ratchet pawl that is formed and the gradual front surface of the ratchet piece formed on the lid, or in addition to this. The ratchet piece itself is also elastically displaced outward in the radial direction, thus overcoming the ratchet pawl and moving the ratchet piece in the circumferential direction. When the lid is rotated relative to the container in the opposite direction in order to open the mouth and neck of the container, it is formed on the raised rear surface of the ratchet claw formed on the mouth and neck and the lid. The cooperation of the ratchet strip with the raised rear surface prevents the ratchet strip from moving in the circumferential direction over the ratchet pawl, thus causing the tamper-evidence skirt to rotate with the main part of the skirt wall. Be blocked. Thus,
Substantial stress is generated in the circumferential weakening line of the lid, and more specifically in its bridging portion, causing the bridging portion to break and separating the tamper-evident skirt from the main portion of the skirt wall. Thereafter, the lid is lifted with rotation and separated from the mouth and neck, leaving the tamper-evident hem, and thus the mouth and neck is opened. When the axial rupture line extending in the axial direction is formed on the tamper evidence hem,
By breaking the axial breaking line, the tamper-evident hem is released from the endless annular shape to the endless belt shape without breaking one to a few bridges, and the ratchet pawl and the ratchet piece cooperate. The tamper-evidence skirt connected to the main part of the skirt wall via the non-breaking bridge is also lifted with rotation and separated from the mouth / neck.

[0006]

The conventional combination of the container and the lid having the above-mentioned forms has the following problems to be solved. When attaching the lid to the mouth and neck of the container, it is necessary for the ratchet piece of the lid to move over the ratchet claw of the mouth and neck and move in the circumferential direction, and for that purpose, the tamper evidence hem of the lid has a radius. It is necessary to be elastically displaced outward in the direction. Thus, when the tamper-evident skirt is displaced radially outward, a non-trivial stress is created in the circumferential weakening line of the skirt wall, and more specifically in its bridge. Therefore, when the lid is attached to the mouth and neck, the bridging portion in the circumferential weakening line formed on the skirt wall is likely to be broken.

In order to surely prevent the bridging portion in the circumferential weakening line from being broken when the lid is attached to the mouth / neck portion, if the breaking strength of the bridging portion in the circumferential weakening line is increased, When opening the mouth and neck of the container, a considerable amount of force is required to break the bridge portion in the circumferential weakening line, which makes opening of the mouth and neck considerably difficult, especially for women and children.

The present invention has been made in view of the above facts, and the main problem to be solved is to eliminate the need to excessively increase the breaking strength of the bridging portion in the circumferential weakening line formed in the skirt wall. Therefore, even if a woman or a child can open the mouth and neck with sufficient ease, the circumferential weakening line formed on the skirt wall when the lid is attached to the mouth and neck to seal the mouth and neck It is an object of the present invention to provide a new and improved container-lid combination in which breakage of the bridging portion in is sufficiently reliably avoided.

[0009]

In order to achieve the above-mentioned main problems to be solved, the inventors of the present invention previously mentioned in 1993 Japanese Patent Application No. 145851 and the drawings that the outer peripheral surface of the mouth and neck portion of the container. Each of the plurality of ratchet pawls arranged in
When viewed in the direction of relative rotation of the container with respect to the lid when the male screw thread and the female screw thread are screwed together, a gentle front surface extending obliquely upward (not radially outward) toward the rear ( A riser rear surface extending upward (rather than radially outwardly) and each of the plurality of ratchet pieces disposed on the tamper-evidence hem of the lid is surrounded by a tamper-evident hem. It was proposed to extend downward with a space in the direction, but as a result of further study, in addition to the previous proposal, an annular shoulder facing downward to the inner peripheral surface of the skirt wall of the lid was proposed. And a plurality of protruding pieces extending downwardly at intervals in the circumferential direction are formed on the annular shoulder portion, and when these male and female threads are screwed together with the protruding pieces, Seen in the direction of rotation of the lid relative to the container, the front and rear Has a rear portion located at, the front portion has a relatively thin radial thickness, the rear portion has a relatively large radial thickness, and the rear portion bulges radially inward beyond the inner surface of the front portion. A circumferential weakening line is formed by bulging the skirt wall in such a manner that the bulging portion is formed, and the bulging portion of each of the protruding pieces is left at least partially below the annular shoulder portion to cut the skirt wall in the circumferential direction. The tamper-evidence skirt is connected to the main part of the skirt wall through a bridging part defined by the bulging part that remains without cutting, and each of the protruding pieces is formed. The lower part of each of the side walls is formed so as to extend downward without being connected to the inner peripheral surface of the skirt wall on any side surface,
It has been found that the main technical problem can be achieved more reliably by making such a lower part of the projecting piece constitutes a ratchet piece that cooperates with the ratchet pawl of the container.

That is, according to the present invention, as a combination of a container and a lid that achieves the above-mentioned main technical problems, a container having a male thread on the outer peripheral surface of the mouth and neck, a top wall and A cylindrical skirt wall is hung from the top wall, and a circumferential weakening line extending in the circumferential direction is formed on the skirt wall, and the skirt wall and the main portion above the circumferential weakening line and the main portion above the circumferential weakening line. It is partitioned into a tamper-evidence hem below the circumferential weakening line, and the male thread disposed on the mouth-neck of the container is provided on the inner peripheral surface of the main portion of the skirt wall. In combination with a lid in which a female thread to be screwed is formed, the outer peripheral surface of the mouth-neck portion of the container is provided with respect to the lid when the male thread and the female thread are screwed together. When viewed in the relative rotation direction of the container, a gradual front surface that extends backward and inclines upward A plurality of ratchet pawls having an upright rear surface extending upward are formed, and a downwardly facing annular shoulder portion is formed on an inner peripheral surface of the skirt wall of the lid, and the ratchet pawls are circumferentially spaced from each other. A plurality of projecting pieces extending downward from the annular shoulder are formed, and the projecting pieces are provided on the lid for the container when the male screw and the female screw are screwed together. When viewed in the relative rotation direction, it has a front part located on the front side and a rear part located on the rear side, the radial thickness of the front part is relatively thin, and the radial thickness of the rear part is relatively thick. ,
The rear portion has a bulging portion that bulges radially inward beyond the inner surface of the front portion, and at least partially covers the bulging portion of each of the protruding pieces below the annular shoulder portion. The circumferential weakening line is formed by cutting the skirt wall in the circumferential direction while remaining, and the tamper-evidence skirt is bridged by the bulging portion left without cutting. Is connected to the main part of the skirt wall via a portion, and the lower part of each of the protruding pieces is extended downward without being connected to the inner peripheral surface of the skirt wall on any side surface. , The lower part of the projecting piece constitutes a ratchet piece cooperating with the ratchet pawl of the container.

A protruding flange is formed on the outer peripheral surface of the mouth-neck portion of the container so as to project outward in the radial direction below the male screw, and the ratchet pawl is provided on the upper surface of the protruding flange. It is expediently formed. The inclination angle α of the front surface of each of the ratchet pawls is 25 to 65 degrees,
The inclination angle β of the rear surface of each of the ratchet pawls is preferably 70 to 140 degrees. In a preferred example, the skirt wall is provided with an annular surrounding wall extending further downward from the tamper-evidence skirt, and the inner diameter of the annular surrounding wall is larger than the inner diameter of the tamper-evident skirt. , The protrusion is directly connected to the inner surface of the tamper-evidence skirt, but the annular surrounding wall is spaced radially outward from the lower portion of the protruding piece to connect the lower portion of the protruding piece. Surrounded. At least the lower portion of the projecting piece is 10 to 7 rearwardly downward as viewed in the relative rotation direction of the lid with respect to the container when the male screw thread and the female screw thread are screwed together.
It is preferable that the protrusion extends at an inclination angle γ of 0 degree.

[0012]

In the combination of the container and the lid of the present invention, when the lid is mounted on the mouth and neck of the container by rotating the lid relative to the container in the mounting direction, Due to the gentle front guiding action of the ratchet pawl, the projecting piece of the lid, especially the lower portion of the ratchet piece, is bent in the circumferential direction, and the ratchet piece moves over the ratchet pawl in the circumferential direction. Such a circumferential deflection of the ledge is generated by the force exerted by the ratchet pawl on the front side of the ledge, centered on the bridge located at the rear of the ledge at a distance from the front surface, thus This is achieved by elastically deforming the protrusion itself without causing a relatively large stress in the entanglement. From the ratchet piece defined by the lower part of the protruding piece, some force acting upward or circumferentially is transmitted to the tamper evidence hem,
When the tamper-evidence skirt is displaced upward or circumferentially by such a force, the upper end of the tamper-evidence skirt directly contacts the lower end of the main part of the skirt wall. The force is transmitted from the tamper-evidence hem to the main part of the skirt wall without causing any significant stress. The tamper-evidence skirt is not displaced radially outwardly, which causes excessive stress to be generated in the bridge, and when the lid is attached to the mouth and neck of the container, it does not become It is surely avoided that the bridge portion is broken due to excessive stress. When the lid is rotated in the opposite direction to open the mouth and neck, by the cooperation of the raised rear surface of the ratchet pawl on the mouth and neck and the rear surface of the ratchet piece defined by the lower part of the protruding piece on the lid. Rotation of the tamper evidence hem is blocked. At this time, a force is applied to the rear surface of the lower portion of the protruding piece that constitutes the ratchet piece, and a considerable stress is generated in the bridge portion located close to the rear surface, thus making the bridge portion sufficiently easy. To be broken as required.

[0013]

The preferred embodiments of the combination of the container and the lid constructed according to the present invention will be described below with reference to the accompanying drawings.
Further details will be described.

The preferred embodiment of the combination of the present invention comprises a container whose mouth and neck 2 is shown in FIG. 1 and a lid 4 which is shown generally in FIG.

Referring to FIG. 1, a container which can be formed of a suitable synthetic resin such as polyethylene terephthalate or glass has a mouth 2 having a substantially cylindrical shape. On the outer peripheral surface of the mouth / neck portion 2, a male thread 6 and an annular locking jaw 8 located below the male thread 6 are formed. When the lid 4 shown in FIG. 2 is applied to the mouth / neck portion 2, the locking jaw 8 is unnecessary, but instead of the lid 4 shown in FIG. 2, the locking jaw 8 is locked to the inner surface of the tamper evidence hem. A well-known synthetic resin lid or a well-known metal lid in which the lower end of the tamper-evident hem is deformed radially inward after being mounted on the mouth-neck 2 When applied, the locking means or the lower end of the modified tamper-evidence hem is locked to the locking jaw (hence the mouth and neck 2 shown with the lid shown in FIG. 2). , The above-mentioned well-known synthetic resin lid or metal lid can be selectively applied).

The mouth / neck portion 2 is further formed with an annular flange 10 which projects radially outward below the locking jaw portion 8. Referring to FIGS. 3 and 4 together with FIG. 1, four ratchet pawls 12 are formed on the upper surface of the annular flange 10 at equal intervals in the circumferential direction. If desired, two or three or five or more ratchet pawls may be formed on the annular flange 10 at appropriate intervals in the circumferential direction. Each of the ratchet claws 12 is rearward when viewed in the rotation direction of the mouth / neck portion 2 with respect to the lid 4 (counterclockwise in FIG. 3, leftward in FIG. 4) when the lid 4 is attached to the mouth / neck portion 2. It has a gradual front surface 14 that extends upwardly and a steep rear surface 16 that extends upward. The inclination angle α of the front surface 14 of the ratchet pawl 12 with respect to the upper surface of the annular flange 10 is 25 to 65 degrees,
The inclination angle β of the rear surface 16 of the ratchet pawl 12 with respect to the upper surface of the annular flange 10 is conveniently between 70 and 140 degrees.

Referring to FIG. 2, the lid 4, which may be formed from a suitable synthetic resin such as polyethylene or polypropylene, has a circular top wall 18 and this top wall 18.
And a cylindrical skirt wall 20 depending from the peripheral edge of the. A liner 21 is arranged on the inner surface of the top wall 18. The liner 21 can be conveniently formed by supplying a synthetic resin material in a softened and melted state to the inner surface of the top surface wall, and then causing the embossing tool to act on the synthetic resin material to cause it to flow into a desired shape. As a synthetic resin material for forming the liner 21, a relatively soft synthetic resin such as soft polyethylene or EVA (ethylene-vinyl acetate copolymer) can be conveniently used. If desired, instead of disposing a separately formed liner 21 on the inner surface of the top wall 18, a seal ridge of any suitable form may be integrally formed on the inner surface of the top wall 18.

Continuing with reference to FIG. 2, the skirt wall 20 includes a main portion 22 and a tamper-evidence skirt 24, the tamper-evidence skirt 24 having an annular surrounding wall 26 attached thereto. . A circumferential weakening line 28 extending in the circumferential direction (the circumferential weakening line 28 will be described in detail later) is provided at a lower portion of the skirt wall 20. Also, an upper main portion 22 and a tamper-evidence hem portion 24 below the main portion 22 are partitioned. The annular surrounding wall 26 extends further downward from the tamper-evidence skirt 24. A female thread 30 is formed on the inner peripheral surface of the main portion 22 of the skirt wall 20.
Are formed. Ventilation notches 32 extending in the axial direction are formed in the female thread 30 at intervals in the circumferential direction. An annular inclined shoulder portion 34 is formed on the outer peripheral surface of the main portion 22 of the skirt wall 20, and anti-slip unevenness 36 is formed in a region above the shoulder portion 34. Further, even in the region below the shoulder portion 34, anti-slip concavities and convexities 37 are formed in four local portions that are equiangularly spaced in the circumferential direction (in FIG. 2, the concavo-convex portions 37 in each of the two parts are respectively formed). Half is shown).

Referring to FIGS. 4 and 5 together with FIG. 2, the inner peripheral surface of the main portion 22 of the skirt wall 20 is provided with an annular shoulder portion 38 located immediately below the female thread 30. An annular shoulder 40 is formed below the annular shoulder 38. Then, on the inner peripheral surface of the skirt wall 20, a plurality of (for example, eight) projecting pieces 42 extending downward from the annular shoulder portion 40 are formed at equal intervals in the circumferential direction. Each of the projecting pieces 42 is a relative rotation direction of the lid 4 with respect to the mouth / neck portion 2 when the lid 4 is attached to the mouth / neck portion 2 of the container (clockwise when viewed from above in FIG. 2, right direction in FIG. 4). ), It is preferable that it is extended so as to be inclined downward with a tilt angle γ.
Conveniently the tilt angle γ is between 10 and 70 degrees.
Preferably, each of the protruding pieces 42 extends downward to a position slightly above the lower end of the skirt wall 20 (and thus to the lower end of the annular surrounding wall 26) or to a position substantially the same as this position. . As can be clearly understood by referring to FIG. 5, each of the protruding pieces 42 is viewed in the direction of relative rotation of the lid 4 with respect to the mouth / neck 2 when the lid 4 is attached to the mouth / neck 2 of the container. The front portion 44 has a relatively thin radial wall thickness, the rear portion 46 has a relatively large radial wall thickness, and the rear portion 46 bulges radially inward beyond the front portion 44. It has a part 48. As can be understood by referring to FIG. 5, in the region from the annular shoulder 40 to the lower end of the tamper-evidence skirt 24, the radially outer surface of the protruding piece 42 is directly on the inner peripheral surface of the skirt wall 20. Connected to each other. However, the inner diameter of the annular surrounding wall 26 extending further downward from the tamper-evidence hem portion 24 is set to be slightly larger than the inner diameter of the tamper-evident hem portion 24, and the annular surrounding wall 26 has a radius from the protruding piece 42. The protruding piece 42 is surrounded by being separated outward in the direction. Therefore, the lower portion of the protruding piece 42 that protrudes downward beyond the tamper-evident hem portion 24 is extended downward without being connected to the inner peripheral surface of the skirt wall 20 on any side surface. The lower part constitutes a ratchet piece 50 cooperating with the ratchet pawl 12 in the mouth neck 2 of the container.

As shown in FIG. 2, on the inner peripheral surface of the skirt wall 20, a plurality of circumferentially located protrusions 42 are provided (in the illustrated embodiment, the protrusions 42 are circumferentially disposed between the protrusions 42). Two auxiliary ribs 52 are also provided at equal intervals. The auxiliary rib 52 is provided on the annular shoulder portion 40.
To the lower end of the tamper-evidence skirt 24, substantially parallel to the projecting piece 42, and thus in the direction of relative rotation of the lid 4 with respect to the mouth / neck 2 when mounting the lid 4 on the mouth / neck 2 of the container. And extends downward with an inclination angle γ of 10 to 70 degrees. The auxiliary ribs 52 increase the rigidity of the lower portion of the skirt wall 20, more specifically the portion from the annular shoulder portion 40 to the lower end of the tamper-evidence hem portion 24, and cut the skirt wall 20 as described in detail below. As a result, the cutting action of the skirt wall 20 by a cutting blade (not shown) is promoted when the circumferential weakening line 28 is formed. Referring to FIGS. 5 and 6 together with FIG. 2, the above-described circumferential weakening line 28 is
It is formed by continuously cutting the skirt wall 20 in the circumferential direction at a portion slightly below the annular shoulder portion 40. The cutting that the skirt wall 20 takes is the skirt wall 2
A cutting blade (not shown) is actuated from the outer peripheral surface side of 0 to leave only the bulging portion 48 of the protruding piece 42 at least partially remaining. In the illustrated embodiment, the skirt wall 20 is cut by leaving only the hatched portion in FIG. 6, that is, the radially inner portion of the bulging portion 48 to form the circumferential weakening line 28. ing. A part of each bulge 48 of the protruding piece 42, which is left without being cut, has a bridging portion 5.
4, and the tamper-evidence skirt portion 24 is connected to the main portion 22 only via the bridging portion 54.

Referring to FIG. 7 together with FIGS. 1 to 6, when the lid 4 is attached to the mouth / neck portion 2 of the container to seal the mouth / neck portion 2, the lid 4 is attached to the mouth / neck portion 2. The lid 4 is closed with respect to the mouth / neck portion 2 by fitting (clockwise when viewed from above in FIG. 7,
4), the female thread 30 of the lid 4 is screwed onto the male thread 6 of the mouth / neck portion 2. The lid 4 is lowered with rotation, and when the male thread 6 and the female thread 30 are screwed together to the state shown in FIG. 7, the liner 21 disposed on the inner surface of the top wall 18 of the lid 4 is opened and closed. The mouth / neck portion 2 is sealed by being brought into close contact with the upper end portion of 2. In the latter half of the mounting operation of the lid 4, the ratchet pawl 12 of the mouth / neck portion 2 and the ratchet piece 50 of the lid 4 (the lower portion of the protruding piece 42) interfere with each other, but the ratchet pawl 12 is loose. The projecting piece 42, whose lower part constitutes the ratchet piece 50 by acting on the front surface 14, has a bridging portion 54 (a non-cut residual portion in the bulging portion 48 of the projecting piece 42) as shown by a two-dot chain line in FIG. ) As a fulcrum, the ratchet piece 50 elastically bends backward and can easily pass through the ratchet pawl 12. When the ratchet piece 50 bends rearward in the circumferential direction and passes through the ratchet pawl 12, some force acting upward or in the circumferential direction is transmitted to the tamper-evidence skirt portion 24, but the circumferential weakening line 28. In, the upper end of the tamper-evidence skirt 24 is pressed directly against the lower end of the main part 22 of the skirt wall 20, and the tamper-evidence skirt 24 is removed from the skirt wall without causing excessive stress in the bridge part 54. The force is transmitted to the main part 22 of 20. The tamper-evidence skirt 24 is not displaced outward in the radial direction to cause excessive stress to be generated in the bridging portion 54, and when the lid 4 is attached to the mouth / neck portion 2 of the container as required, There is virtually no risk of the bridging portion 54 of the weakening line 28 breaking. After passing through the ratchet pawl 12, the ratchet piece 50 elastically restores to its original state.

In order to open the mouth / neck portion 2 of the container, the lid 4 is rotated with respect to the mouth / neck portion 2 in the opening direction (counterclockwise when viewed from above in FIG. 7, leftward in FIG. 4). Thus, in the tamper-evidence hem portion 24, the rear surface of the ratchet piece 50 that extends downward and forward when viewed in the opening direction is the rear surface 16 of the ratchet pawl 12 that is raised.
Abut, which prevents movement in the opening direction.
Thus, the bridging portion 54 (the bulging portion 4 of the protruding piece 42) in the circumferential weakening line 28 formed on the skirt wall 20.
A considerable stress is generated in the non-cut residual portion in 8), and the plurality of bridging portions 54 are broken. When a force is applied from the raised rear surface 16 of the ratchet pawl 12 to the rear surface of the ratchet piece 50, a portion of the front portion 44 of the projecting piece 42 below the circumferential weakening line 28 is above the circumferential weakening line 28. The portion below the weakening line 28 in the protruding piece 42 is deformed forward with its front portion as a so-called fulcrum, and thus the stress is concentrated in the bridging portion 54 to generate a plurality of bridging portions 54. Is released (the liner 21 is separated from the upper end of the mouth / neck 2 and is formed between the liner 21 and the upper end of the mouth / neck 2 and in the female thread 30). The inside of the container is communicated to the outside through the ventilation notch 32) sufficiently before the execution. After the plurality of bridging portions 54 are broken and the tamper-evidence hem portion 24 is separated from the main portion 22 of the skirt wall 20, the portions of the lid 4 other than the tamper-evidence hem portion 24 are male threads. 6 and the female screw 30 cooperate with each other to rotate them in the opening direction and raise them to separate them from the mouth / neck portion 2, and thus the mouth / neck portion 2 is opened.

If desired, one or a few of the plurality of bridging portions 54 in the circumferential weakening line 28 may be made relatively strong and extend further downward from the tamper-evidence skirt 24 and its lower end. A weakening line extending in the axial direction is formed on the annular surrounding wall 26, and when opening the mouth / neck portion 2, the axial weakening line is broken and the tamper-evident hem portion 24 and the annular surrounding wall 26 are endless. One to a few bridging portions 54, which are expanded from an annular shape to end bands (thus allowing the ratchet piece 50 to move in the opening direction), while being relatively strong in the circumferential weakening line 28.
Remains unbroken and continues to connect the tamper-evidence hem 24 to the main portion 22 of the skirt wall 20, and the lid 4 including the tamper-evidence hem 24 and the annular surrounding wall 26.
It is also possible to let the whole of the container separate from the mouth / neck portion 2 of the container.

[0024]

According to the combination of the container and the lid of the present invention, when the lid is attached to the mouth and neck of the container to seal the mouth and neck, the line in the circumferential weakening line formed on the skirt wall is used. Be sure to avoid breaking the bridge section,
When opening the mouth-neck portion of the container, the bridging portion in the circumferential weakening line formed on the skirt wall is sufficiently easily and surely ruptured as required prior to unsealing the mouth-neck portion.

[Brief description of drawings]

FIG. 1 is a side view of the mouth and neck of a container in a preferred embodiment of a combination constructed in accordance with the present invention, with a partial cross-section.

FIG. 2 is a side view, partly in section, of the lid of the preferred embodiment of the combination constructed in accordance with the present invention.

FIG. 3 is a plan view of the mouth / neck portion of FIG. 1.

4 is a partial cross-sectional view showing the mutual relationship between the ratchet claw in the mouth and neck of FIG. 1 and the ratchet piece in the lid of FIG.

5 is a partial perspective view showing a part of the lid of FIG.

6 is a partial cross-sectional view showing a part of the lid of FIG.

7 is a side view showing a state in which the lid of FIG. 2 is attached to the mouth and neck of FIG. 1 in a partial cross section.

[Explanation of symbols]

 2: Mouth neck 4: Lid 6: Male thread 10: Annular flange 12: Ratchet claw 14: Ratchet claw front 16: Ratchet claw rear 18: Top wall 20: Skirt wall 22: Skirt wall main part 24: Tamper evidence hem 26: Annular surrounding wall 30: Female thread 40: Annular shoulder 42: Projecting piece 44: Front of projecting piece 46: Rear of projecting piece 48: Swelling part of projecting piece 50: Ratchet piece 54 : Bridge section

Claims (5)

[Claims] 1. A container in which a male thread is arranged on the outer peripheral surface of the mouth-neck portion, a top surface wall and a cylindrical skirt wall hanging down from the top surface wall, the skirt wall extending in the circumferential direction. An existing circumferential weakening line is formed, and the skirt wall is divided into a main part above the circumferential weakening line and a tamper-evidence skirt below the circumferential weakening line,
In combination with a lid having an internal thread formed on the inner peripheral surface of the main portion of the skirt wall, the internal thread being screwed to the external thread arranged in the mouth and neck of the container, The outer peripheral surface of the mouth-neck portion of the container is inclined upward toward the rear when viewed in the relative rotation direction of the container with respect to the lid when the male screw and the female screw are screwed together. A plurality of ratchet pawls having a gradually extending front surface and an upwardly rising rear surface, and a downwardly facing annular shoulder portion is formed on the inner peripheral surface of the skirt wall of the lid. , A plurality of projecting pieces that extend downward from the annular shoulder portion are formed at intervals in the circumferential direction, and the projecting pieces are used when the male thread and the female thread are screwed together. When viewed in the relative rotation direction of the lid with respect to the container, the lid has a front portion located on the front side and a rear portion located on the rear side, and a half of the front portion. The directional thickness is relatively thin, the rear radial thickness is relatively thick, the rear portion having a bulge that bulges radially inward beyond the inner surface of the front portion, and the annular shoulder Below that, the circumferential weakening line is formed by circumferentially cutting the skirt wall by at least partially leaving the bulged portion of each of the projecting pieces, and the tamper-evident hem is formed. The part is connected to the main part of the skirt wall via a bridging part defined by the bulging part left uncut, the lower part of each of the projecting pieces being And a bottom portion of the protruding piece that constitutes a ratchet piece that cooperates with the ratchet pawl of the container, the lower portion extending downward without being connected to the inner peripheral surface of the skirt wall. Combination to do. 2. An outer peripheral surface of the mouth-neck portion of the container is formed with a bulging flange projecting outward in the radial direction below the male screw thread, and the ratchet pawl is provided with a bulging flange of the bulging flange. The combination according to claim 1, which is formed on an upper surface. 3. The inclination angle α of the front surface of each of the ratchet pawls is 25 to 65 degrees, and the inclination angle β of the rear surface of each of the ratchet pawls is 70 to 140 degrees. The combination described. 4. The skirt wall is provided with an annular surrounding wall extending further downward from the tamper-evidence skirt, and the inner diameter of the annular surrounding wall is larger than the inner diameter of the tamper-evident skirt. , The protrusion is directly connected to the inner surface of the tamper-evidence skirt, but the annular surrounding wall is spaced radially outward from the lower portion of the protruding piece to connect the lower portion of the protruding piece. The combination according to claim 1 or 2, which is surrounding. 5. At least the lower portion of the projecting piece is rearward and downward as viewed in the relative rotation direction of the lid with respect to the container when the male thread and the female thread are screwed together. Extending with an inclination angle γ of 10 to 70 degrees,
The combination according to any one of claims 1 to 4.