JP2012171647A - Synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container lid in which bridging parts (24) are ruptured not substantially at the same time but at an appropriate time interval, when opening the top neck part (44) of a container, accordingly though excessive torque is not needed for rupturing the bridging parts, one or several bridging parts are prevented from remaining without rupturing bridging parts (24) as far as possible.SOLUTION: A locking means (30) disposed on the inner peripheral surface of a tamper evident hem part (20) is constituted of a plurality of projections (32) projected in a radial direction at an interval in a circumferential direction. Then, the projections (32) are disposed at equal intervals in the circumferential direction and include a plurality of inclined projections in which a locking upper surface (33) is inclined relative to a horizontal plane.

Description

  The present invention relates to a synthetic resin container lid in which a circumferentially extending break line is formed in a cylindrical skirt wall depending from a peripheral edge of a circular top wall, and the break line includes a plurality of bridge portions.

  As is well known, a combination of a container formed of glass, a synthetic resin or a metal thin plate and a container lid formed of a synthetic resin is widely used for beverages. The container has a cylindrical mouth-and-neck portion, and a male thread and a locking jaw portion positioned below the male thread are formed on the outer peripheral surface of the mouth-and-neck section. On the other hand, the container lid has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall. A rupture line extending in the circumferential direction is formed on the skirt wall, and the skirt wall is divided into a main part above the break line and a tamper evidence skirt below the break line. The break line includes a plurality of bridge portions arranged at intervals in the circumferential direction, and the tamper evidence skirt portion is connected to the main portion via the bridge portion. A female thread is formed on the inner peripheral surface of the main part of the skirt wall and is screwed into the male thread of the mouth and neck. A locking means that is locked to the locking jaw is provided.

  After filling the container with the beverage, the container lid is fitted over the mouth and neck of the container, the container lid is rotated in the closing direction, and the female thread of the container lid is screwed into the male thread of the mouth and neck. Attach a container lid to the neck and seal the mouth and neck. The locking means disposed on the skirt wall tamper-evidence skirt elastically rides over the locking jaw of the mouth and neck and is positioned below the locking jaw. When the mouth and neck are opened and the beverage is consumed, the container lid is rotated in the opening direction. In this way, the container lid is raised with respect to the mouth-and-neck portion according to the release of the screwing between the female screw and the male screw. When the container lid is lifted somewhat, the locking means arranged at the skirt wall tamper-evidence skirt is locked to the bottom of the mouth-neck locking jaw, thereby tamper-evident. The skirt is prevented from rising. If the container lid continues to rotate in the opening direction, the bridging part is broken by the stress generated at the bridging part in the breaking line formed on the skirt wall, and the tamper evident skirt part of the skirt wall starts from the main part. To be separated. When the container lid continues to rotate in the opening rotation direction, the tamper evidence hem remains, the container lid is detached from the mouth and neck, and the mouth and neck are released.

  In the container lid as described above, when a plurality of bridging portions existing in the breaking line can be broken at substantially the same time, the torque required for breaking the bridging portion becomes excessive. And for children, the breakage of the bridging portion becomes extremely difficult, and therefore the opening of the mouth and neck tends to be extremely difficult. Therefore, in Patent Document 1 below, the cross-sectional areas of a plurality of bridging portions are appropriately changed so that the plural bridging portions are not simultaneously at the same time but are sequentially broken from those having a small cross-sectional area. It has been proposed that

Japanese Patent Laid-Open No. 7-300147

  According to the experiences of the present inventors, in the container lid of the form disclosed in Patent Document 1, the main part of the container lid is the mouth and neck without breaking one or several bridging portions. The main part of the container lid continues to be connected to the tamper evidence hem that remains in the mouth and neck through one or several bridging parts (generally “hanging state” or “ghost” Tend to occur).

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that when opening the mouth and neck of the container, all the bridging portions are not substantially the same, and the time interval is appropriately set. As much as possible, one or several bridges remain without being broken, even though an excessive torque is not required to break the bridge. It is to provide a new and improved synthetic resin container lid that is avoided.

As a result of intensive studies, the present inventors, in the container lid of the form disclosed in the above Patent Document 1,
Due to the fact that the breakage of the plurality of bridge portions is not uniformly performed in the circumferential direction, in other words, due to the fact that the breakage of the plurality of bridge portions is unevenly performed in the circumferential direction, 1 It was recognized that one or several bridges tend to remain without breaking. And based on such recognition, a plurality of bridging portions are broken at an appropriate time interval, but by breaking the bridging portion uniformly or substantially uniformly in the circumferential direction, It has been learned that the main technical problems can be achieved. A plurality of bridging portions are broken at appropriate time intervals, but in order to break the bridging portions as uniformly as possible in the circumferential direction, The locking means disposed on the inner peripheral surface of the portion is composed of a plurality of protrusions protruding radially inward at intervals in the circumferential direction, and at least the plurality of locking upper surfaces of the protrusions are horizontally And found that it should be tilted.

That is, according to the present invention, the synthetic resin container lid for achieving the main technical problem includes a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and the skirt wall has a circumferential direction. The skirt wall is partitioned into a main portion above the break line and a tamper evidence skirt below the break line, and a female screw is formed on the inner peripheral surface of the main portion. In a synthetic resin container lid in which a strip is formed and a locking means is disposed on the inner peripheral surface of the tamper evidence hem,
The locking means is composed of a plurality of protrusions protruding radially inward at intervals in the circumferential direction, the protrusions being arranged at equal intervals in the circumferential direction, and the locking upper surface with respect to the horizontal. There is provided a synthetic resin container lid characterized by including a plurality of inclined protrusions which are inclined.

  Preferably, the protrusions are arranged at equal intervals in the circumferential direction, and all the protrusions are inclined protrusions having the same form. The break line is composed of a plurality of slits arranged at equal intervals in the circumferential direction and a plurality of bridging portions left between the slits, and the circumferential length of the plurality of slits. Conveniently all are the same and the cross-sectional area of the bridge is all the same.

  In the synthetic resin container lid of the present invention, when opening the mouth and neck of the container, the inclined protrusion gradually contacts the locking jaw of the mouth and neck from the upper end to the lower end of the upper surface of the locking. Therefore, it is sequentially broken from the bridging portion near the upper end of the locking upper surface of the inclined protrusion. Since the inclined protrusions are arranged at equal intervals in the circumferential direction, the breakage of the bridging portion is performed equally or substantially equally in the circumferential direction. Therefore, it is avoided as much as possible that one or several bridge portions remain without being broken even though excessive torque is not required to break the bridge portion. The

The front view which shows a suitable embodiment of the synthetic resin container lid comprised according to this invention in part in a cross section. FIG. 3 is a development view of a tamper evidence skirt shown in FIG. 1. The front view which shows the state which mounted | wore the mouth neck part of the container with the container lid of FIG. FIG. 4 is a cross-sectional view of a state in which the container lid is slightly rotated in the rotation direction from the state shown in FIG. 3 and the contact portion is engaged with the locking jaw portion. The front view in the state which rotated the container lid further in the rotation direction from the state shown in FIG.

  Hereinafter, a preferred embodiment of a synthetic resin container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

  Referring to FIG. 1, a container lid 2 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene has a circular top wall 4 and a cylindrical skirt depending from the periphery of the top wall 4. Wall 6. A cylindrical inner seal piece 8 that hangs downward and a cylindrical outer seal piece 10 that also hangs downward are formed on the outer peripheral edge of the inner surface of the top wall 4. Further, a relatively small annular protrusion 9 is formed between the inner seal piece 8 and the outer seal piece 10.

  The skirt wall 6 has a relatively thick upper portion 12 and a relatively thin thin portion 14. A rupture line 16 extending in the circumferential direction is formed at the upper end of the thin lower portion 14, and the skirt wall 6 is divided into a main portion 18 above the rupture line 16 and a tamper evidence skirt 20 below the rupture line 16. Has been. In the illustrated embodiment, the breaking line 16 includes a plurality of slits (cut grooves) 22 extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridge portions 24 remaining between the slits 22. The tamper evidence skirt portion 20 is connected to the main portion 18 via a plurality of bridging portions 24. In the illustrated embodiment, the circumferential lengths of the plurality of slits 22 are all substantially the same, and the interval between adjacent slits 22, and hence the circumferential length of the bridging portion 24, are all substantially the same. The cross-sectional areas of the plurality of bridging portions 24 are all substantially the same.

  On the outer peripheral surface of the main portion 18 of the skirt wall 6, a non-slip knurl 26 is formed that is configured by uneven shapes alternately present in the circumferential direction. Three female threads 28 are formed on the inner peripheral surface of the main portion 18 of the skirt wall 6. The three female threads 28 are disposed at an angular interval of 120 degrees, and each of the three female threads 28 extends over an angle range of approximately 160 degrees.

  Locking means 30 is disposed on the inner peripheral surface of the tamper evidence skirt 20. It is important that the locking means 30 is composed of a plurality of protrusions 32 that are spaced apart in the circumferential direction and protrude inward in the radial direction. 2 and FIG. 2, in the illustrated embodiment, five protrusions 32 are arranged at equal intervals in the circumferential direction, and the five protrusions 32 are substantially the same. It is. Each of the protrusions 32 is an inclined protrusion, that is, has a locking upper surface 33 inclined at an inclination angle α which may be about 5 to 30 degrees downward in the right direction in FIG. It is important that the inclined protrusions are uniformly arranged in the circumferential direction, but it is not necessary that all the protrusions 32 are inclined protrusions, and a plurality of protrusions 32 positioned at equal intervals in the circumferential direction, for example, In FIG. 2, only two protrusions 32 located on both sides and one protrusion 32 located in the center are inclined protrusions, and the remaining protrusions 32 are non-inclined protrusions whose locking upper surfaces extend substantially horizontally. You can also. The relative relationship between the plurality of protrusions 32 and the plurality of bridge portions 24 is preferably substantially uniform over the entire circumference.

  On the inner peripheral surface of the tamper evidence skirt 20, a large diameter upper portion 34 and a small diameter lower portion 36 are disposed above the locking means 30. The large diameter upper part 34 has an inner diameter d1, the small diameter lower part 36 has an inner diameter d2, and the inner diameter d2 is smaller than the inner diameter d1 (d2 <d1). Between the large-diameter upper portion 34 and the small-diameter lower portion 36 is a boundary portion 38 having an inverted truncated cone shape in which the inner diameter gradually decreases downward.

  FIG. 3 also shows the mouth / neck portion 44 of the container together with the container lid 2. The mouth / neck portion 44 of the container, which can be formed from an appropriate synthetic resin such as polyethylene terephthalate, glass, or a thin metal plate, has a cylindrical shape as a whole, and has three male threads on the outer peripheral surface of the mouth / neck portion 44. 46 and a locking jaw portion 48 located below the male thread 46 are formed. The three male threads 46 are formed to correspond to the three female threads 28 in the container lid 2 and are arranged at an angular interval of 120 degrees and extend over an angular range of approximately 160 degrees. It is present. The locking jaw 48 has a truncated cone-shaped upper surface 50 whose outer diameter gradually increases downward, an outer peripheral surface 52 having a cylindrical shape, and a lower surface 54 extending substantially horizontally. Further provided on the outer peripheral surface of the mouth / neck portion 44 is a support ring 56 located below the locking jaw portion 48 (the support ring 56 is used for transporting containers as is well known to those skilled in the art). ing.

  When the container lid 2 is attached to the mouth and neck portion 44 after the contents are filled in the container and the mouth and neck portion 44 is sealed, the container lid 2 is fitted on the mouth and neck portion 44 and the container lid 2 is closed. 3, the female thread 28 of the container lid 2 is screwed onto the male thread 46 of the mouth-and-neck portion 44. When the female thread 28 is screwed onto the male thread 46 until the state shown in FIG. 3, the inner seal piece 8 of the container lid 2 enters the mouth neck 44 and is brought into close contact with the inner peripheral surface of the mouth neck 44. The annular protrusion 9 is brought into intimate contact with the top surface of the mouth and neck portion 44, and the outer seal piece 10 is brought into intimate or close proximity to the outer peripheral surface of the mouth and neck portion 44, thus sealing the mouth and neck portion 44. The locking means 30 disposed on the inner peripheral surface of the tamper evidence skirt 20 elastically moves the locking jaw 48 of the mouth and neck 44 (ie, by elastic deformation or displacement of the tamper evidence skirt 20). It gets over and is positioned below the locking jaw 48.

  In a state where the container lid 2 is attached to the mouth / neck portion 44 as required, that is, as shown in FIG. 3, the large-diameter upper portion 34 on the inner peripheral surface of the tamper evidence hem portion 20 is locked in the mouth / neck portion 44. It is located opposite to the outer peripheral surface 52 of the jaw part 48. The inner diameter d1 of the large-diameter upper portion 34 with respect to the outer diameter D of the locking jaw portion 48 is conveniently d1 ≧ D, preferably about 0 mm ≦ (d1−D) ≦ 0.4 mm. It is desirable that the engaging jaws 48 are loosely fitted, that is, substantially separated (including a simple contact state) or relatively weakly engaged without being brought into close contact.

  When opening the mouth-and-neck portion 44 to consume the contents, the container lid 2 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. At the beginning of such rotation, the large initial diameter upper portion 34 on the inner peripheral surface of the tamper evidence skirt 20 is loosely or weakly engaged with the locking jaw portion 48 of the mouth and neck portion 44, so that the necessary initial torque is excessive. Never become. When the container lid 2 is slightly rotated in the opening rotation direction and the container lid 2 is somewhat raised with respect to the mouth-and-neck portion 44, the small diameter on the inner peripheral surface of the tamper evidence skirt 20 as shown in FIG. The lower portion 36 is positioned to face the outer peripheral surface 52 of the locking jaw portion 48 of the mouth / neck portion 44. The inner diameter d2 of the small-diameter lower portion 36 is d2 ≦ D, preferably 0 mm <(D−d2) ≦ 0.5 mm, with respect to the outer diameter D of the locking jaw portion 48, and the outer peripheral surface 52 of the locking jaw portion 48 is On the other hand, the small-diameter lower portion 36 is in an interference fit state. At the same time or slightly before or after this, the uppermost portion of the locking upper surface 33 of the protrusion 32, that is, the left end in FIG. 2, contacts the lower surface 54 of the locking jaw portion 48.

  When the container lid 2 is further rotated in the opening direction from the state shown in FIG. 4, the locking upper surface 33 of the protrusion 32 gradually moves from the uppermost portion to the lowermost portion, that is, the right end in FIG. It is brought into contact with the lower surface 54. Since the contact of the locking jaw portion 48 with the lower surface is gradually advanced from the uppermost portion of the locking upper surface 33 of the protrusion 32 toward the lowermost portion, the upward movement of the tamper evidence skirt portion 20 is also prevented. Progression gradually proceeds from the uppermost part of the locking upper surface 33 of the protrusion 32 toward the lowermost part, and therefore, the upper edge of the tamper evidence skirt 20 is exaggerated in FIG. And deformed from a horizontal state to a wave shape. Because of this, the breakage of the plurality of bridging portions 24 is started from the bridging portion 24 located close to the uppermost portion of the locking upper surface 33 of the protrusion 32 with a slight time delay. The protrusion 32 is gradually advanced toward the bridge portion 24 where the lowermost portion of the locking upper surface 33 of the protrusion 32 and the portion where the protrusion does not exist are located. Thus, not all the bridge portions 24 are broken at the same time, but the breakage of the bridge portion 24 proceeds gradually with a slight time delay. There is no need for torque. Further, since the protrusions 32 on which the locking upper surface 33 is inclined are arranged uniformly in the circumferential direction, the breakage of the bridging portion 24 is performed uniformly in the circumferential direction, and thus one piece of the bridging portion 24 is obtained. Or it is avoided as much as possible that several remain without breaking.

  After the breaking line 16 is broken all over and the tamper evidence skirt 20 is separated from the main portion 18 of the skirt wall 6, the container lid 2 is rotated in response to the rotation of the container lid 2 in the opening direction. The portion excluding the tamper evidence skirt 20 is raised, the tamper evidence skirt 20 remains in the mouth neck portion 44, the container lid 2 is detached from the mouth neck portion 44, and thus the mouth neck portion 44 is opened. .

2: Container lid 4: Top wall 6: Skirt wall 16: Break line 18: Main part 20: Tamper evidence hem part 22: Slit 24: Bridge part 28: Female thread 30: Locking means 32: Protrusion 33: Locking top surface of protrusion 44: Mouth and neck 46: Male thread 48: Locking jaw

Claims (3)

A circular skirt wall and a cylindrical skirt wall depending from the periphery of the top wall, and a rupture line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is a main portion above the rupture line. And a tamper evidence bottom part below the breaking line, a female thread is formed on the inner peripheral surface of the main part, and a locking means is arranged on the inner peripheral surface of the tamper evidence bottom part. In the synthetic resin container lid,
The locking means is composed of a plurality of protrusions protruding radially inward at intervals in the circumferential direction, the protrusions being arranged at equal intervals in the circumferential direction, and the locking upper surface with respect to the horizontal. A synthetic resin container lid comprising a plurality of inclined protrusions which are inclined with respect to each other.   The synthetic resin container lid according to claim 1, wherein the protrusions are arranged at equal intervals in the circumferential direction, and all the protrusions are inclined protrusions having the same form.   The break line is composed of a plurality of slits arranged at equal intervals in the circumferential direction and a plurality of bridging portions left between the slits, and the circumferential length of the plurality of slits. 3. The synthetic resin container lid according to claim 1, wherein all the cross-sectional areas of the bridge portions are the same.

Images