JP2015182810A - synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug type synthetic resin container lid capable of being surely attached to a neck of a container with a relatively small plugging force, free from the need of an additional operation such as cutting, after molding, and having no possibility of flight of the container lid owing to that a pressure is released at an initial stage of opening when the interior of the container is in a pressurized state.SOLUTION: A plurality of thin wall reverse pieces 16 connected to a boundary area between the outer peripheral surface of a skirt wall 6 and the upper surface of a top wall, or a portion above the upper edge of a cylindrical seal in the outer peripheral surface of the skirt wall, and extending upward from a bottom edge over the top wall are arranged at intervals in the circumferential direction. A cylindrical binding wall 18 is connected to the upper edge of the thin wall reverse piece, and an opening ring 26 surrounding the binding wall is arranged. The binding wall is formed with a pair of scores or slits extending in a central axis line direction at an interval in the circumferential direction, and the outer peripheral surface of the binding wall is connected to the inner peripheral surface of the opening ring through a projection 24 positioned between the pair of scores or slits. At least one upper edge of the thin wall reverse pieces is connected to the binding wall between the pair of scores or slits.

Description

  The present invention relates to a synthetic resin container lid of a form generally referred to as a plugging type, which is attached to the mouth and neck by being fitted to the mouth and neck of the container and forced downward.

  The following Patent Document 1 discloses a stopper-type synthetic resin container that can be removed from the mouth and neck of the container without using an opening device even though the mouth and neck of the container can be sufficiently sealed. A lid is disclosed. The container lid includes a circular top wall (top plate portion), a cylindrical skirt wall (skirt portion) depending from the periphery of the top wall, and a restraining ring (ring-shaped side wall) surrounding the skirt wall. The skirt wall is formed with a plurality of slits extending upward from the lower end at intervals in the circumferential direction, and a locking protrusion is formed at the lower part of the inner peripheral surface of the skirt wall. The restraining ring is integrally connected to the skirt wall via a connecting portion in the circumferential specific region, and is not connected to the outer peripheral edge of the skirt wall in the region other than the specific region, but the outer peripheral surface of the skirt wall. It is closely attached to.

  The container lid as described above is fitted on the mouth / neck portion of the container and forced downward, and a locking protrusion formed on the inner peripheral lower portion of the skirt wall is formed on the outer peripheral surface of the mouth / neck portion. By elastically climbing over the locking jaw and being able to be locked to the locking jaw, the mouth and neck are sealed by being attached to the mouth and neck. Since the expansion of the skirt wall radially outward is limited by the restraining ring, the container lid is securely attached to the mouth and neck to seal the mouth and neck, and the container lid is accidentally detached from the mouth and neck. There is no fear of being done. When opening the mouth and neck, the restraint ring is gripped and the restraint ring is swung upward using the specific region as a pivot base, and the restraint ring is separated upward from the skirt wall in a region other than the specific region, Thus, the restraint of the skirt wall is released. Next, when the restraint ring is further forced upward, the lower part of the restrained skirt wall is displaced radially outward, and the latching ridge of the skirt wall is unlocked from the latching jaw of the mouth and neck. Then, the entire container lid is detached from the mouth and neck.

Japanese Patent No. 3492007

  Thus, in the conventional container lid as described above, (1) when the container lid is attached to the mouth / neck portion of the container, the restraint ring surrounds the skirt wall over the entire circumferential direction. It is necessary to force the lid downward, and a considerably large forcing force, that is, a plugging force, is required. (2) As described in the above-mentioned Patent Document 1, in order to complete the container lid, It is necessary to cut the skirt wall and the restraining ring by cutting with a cutting blade in a region other than the specific region after integrally forming the restraining ring, and the manufacturing process is complicated. (3) Contents of the container Is a liquid containing a gas such as carbon dioxide gas and the container is under pressure, the container lid is almost detached from the mouth and neck when the container lid is detached from the mouth and neck of the container. The pressure inside the container is released instantly, There is a possibility that due to container closure resulting in flight, there is a problem to be solved that.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that it can be attached to the mouth / neck portion of the container sufficiently reliably even though it can be attached to the mouth / neck portion of the container with a relatively small stoppering force. Can be manufactured without additional operations such as cutting after injection or compression molding, and also when the container is under pressure, the initial stage of opening (and therefore the container lid A new and improved plug-type synthetic resin container lid that releases the pressure in the container when it is still firmly attached to the mouth and neck), and therefore does not cause the container lid to fly. Is to provide.

  As a result of intensive studies, the present inventors have determined that the top wall from the lower end connected to the boundary region between the outer peripheral surface of the skirt wall and the upper surface of the top wall or the upper part of the cylindrical seal on the outer peripheral surface of the skirt wall. A plurality of thin reversal pieces extending upward in the circumferential direction at intervals, a cylindrical restraint wall is connected to the upper end of the thin reversal piece, and an opening ring surrounding the restraint wall is disposed. A pair of scores or slits extending in the central axis direction at intervals in the circumferential direction is formed on the constraining wall, and the outer peripheral surface of the constraining wall is placed inside the opening ring via a ridge located between the pair of scores or slits. It has been found that the main technical problem described above can be achieved by a uniquely shaped container lid connected to the peripheral surface and having at least one upper end of the thin-walled inversion piece connected to a constraining wall between a pair of scores or slits. .

That is, according to the present invention, the synthetic resin container lid that achieves the main technical problem includes a circular top wall and a skirt wall that hangs down from the periphery of the top wall. A cylindrical seal that extends downward and is brought into close contact with the upper end of the outer peripheral surface of the cylindrical mouth-and-neck portion of the container is disposed, and a locking ridge is formed on the inner peripheral surface of the skirt wall In the plastic container lid,
Connected to a boundary region between the outer peripheral surface of the skirt wall and the upper surface of the top wall, or a portion above the upper end of the cylindrical seal on the outer peripheral surface of the skirt wall, which is arranged in a plurality of intervals in the circumferential direction. A thin reversal piece extending upward from the lower end over the top wall, a cylindrical constraining wall connected to the upper end of the thin reversal piece, and an opening ring surrounding the constraining wall,
The constraining wall is formed with a pair of scores or slits extending in the central axis direction at intervals in the circumferential direction, and the outer peripheral surface of the constraining wall is interposed via a ridge located between the pair of scores or slits. Connected to the inner peripheral surface of the opening ring,
A synthetic resin container lid is provided in which at least one upper end of the thin-walled inversion piece is connected to the constraining wall between the pair of scores or slits.

  Preferably, the lower end portion of the outer peripheral surface of the constraining wall is connected to the inner peripheral surface of the unsealing ring through the protrusion. The protrusion is provided with a pair of extending pieces extending on both sides in the circumferential direction along the outer peripheral surface of the constraining wall, and the extending end inner surface of each of the pair of extending pieces has a radial direction. Engagement means projecting inward are formed, and engaged means are formed on the outer periphery in the circumferential direction of each of the pair of scores or slits on the outer peripheral surface of the constraining wall. The circumferentially outer portions of each of the pair of scores or slits on the restraint wall are displaced in a direction away from the pair of scores or slits in the circumferential direction in cooperation with each of the engaged means. It is preferable to limit this.

  The synthetic resin container lid of the present invention can be manufactured by injection or compression molding without requiring additional steps such as cutting. In the synthetic resin container lid of the present invention, when the container lid is attached to the mouth / neck portion of the container, the thin-walled inversion piece extends upward and the restraint wall is separated upward from the skirt wall. In this state, the top wall and the skirt wall are forced downward to move the locking ridge formed on the inner peripheral surface of the skirt wall below the locking jaw of the mouth and neck, and then the thin inverted piece is inverted. The restraint wall can be made to extend downward and surround the skirt wall, so that the container lid can be attached to the mouth-and-neck portion with a relatively small plugging force. In a state where the container lid is attached to the mouth and neck, the container lid is sufficiently reliably maintained on the mouth and neck because the restraint wall surrounds the skirt wall. When removing the container lid from the mouth and neck of the container, by pulling the opening ring upward (if a pair of scores are formed, the pair of scores is broken) between the pair of scores or slits The skirt wall is partially re-inverted (ie, restored to its original state) in a state where the thin-walled reversal piece located in the upper part is extended upward, and the restraint is released by the re-inverted thin-walled reversal piece when the opening ring is further forced upward. Is displaced radially outward and the pressure in the container is released while this is still constrained by the constraining wall (this reliably prevents the container lid from flying) and then further opened. Forcing the ring upward removes the container lid from the mouth and neck.

The perspective view which shows the synthetic resin container lid comprised according to this invention. The front view of the container lid shown in FIG. FIG. 2 is a plan view of the container lid illustrated in FIG. 1. Sectional drawing of the container lid shown in FIG. The partial slope figure which shows a pair of score of the container lid shown in FIG. Sectional drawing for demonstrating the mode which equips the container neck shown in FIG. 1 thru | or 4 with the mouth neck part of a container. Sectional drawing for demonstrating the style which mounts | wears the container neck shown in FIG. 1 thru | or FIG. 5 with the mouth neck part of a container. Sectional drawing for demonstrating the mode which detach | leaves the container lid shown in FIG. 1 thru | or FIG. 5 from the mouth neck part of a container. Sectional drawing for demonstrating the mode which detach | leaves the container lid shown in FIG. 1 thru | or FIG. 5 from the mouth neck part of a container. The partial slope figure which shows a pair of slit formed instead of a pair of score.

  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 FIGS. 1 to 4, a synthetic resin container lid, generally designated by numeral 2, constructed in accordance with the present invention is integrally molded from an appropriate synthetic resin such as polyethylene or polypropylene by injection or compression molding. be able to. The container lid 2 includes a circular top wall 4 and a substantially cylindrical skirt wall 6 depending from the periphery of the top wall 4. A cylindrical seal 8 is formed on the outer peripheral edge of the inner surface of the top wall 4, and a cylindrical guide hanging piece 10 located inside the seal 8 is also formed. The lower part of the skirt wall 6 is inclined outward in the radial direction downward, and a locking protrusion 12 is formed on the inner peripheral surface of the lower part. Furthermore, a plurality of slits 14 extending upward from the lower end are arranged at equal intervals in the circumferential direction at the lower part of the skirt wall 6. Each of the slits 14 extends to the upper end of the sloped lower portion of the skirt wall 6, and the locking ridge 12 is continuously extended in the circumferential direction except for a portion where the slit 14 exists.

  The container lid 2 is further provided with a plurality of thin inversion pieces 16 extending upward beyond the top wall 4 at intervals in the circumferential direction. Each of the thin inversion pieces 16 is an upper surface of the top wall 4. Above the upper end of the seal 8 (that is, the base end connected to the inner surface of the top wall 4) at the boundary between the skirt wall 6 and the outer peripheral surface of the skirt wall 6 (and therefore in any case) It is important that they are connected (above the upper end of the seal 8). In the illustrated embodiment, each of the thin inversion pieces 16 extends upward from the lower end connected to the upper end of the outer peripheral surface of the skirt wall 6 beyond the top wall 4. As will be described later, from the viewpoint of ease of detaching the container lid 2 from the mouth and neck of the container, the number of the thin inverted pieces 16 formed at equal intervals in the circumferential direction is n, and the thin inverted pieces N × w = 0.8 × n × b to 6.0 × n × g, i.e., thin wall, where w is the circumferential width of each of 12 and g is the circumferential interval between adjacent thin inversion pieces 16. It is preferable that the existence area of the reversal piece 16 is about 0.8 to 6.0 times the non-existence area. The thickness of each thin reversal piece 16 may be about 0.3 to 0.5 mm.

  A cylindrical constraining wall 18 is connected to the upper end of the thin inverted piece 16. As clearly understood by referring to FIG. 5 in conjunction with FIG. 1 and FIG. 3, the constraining wall 18 has a pair of scores (thin walls) at an angular interval that is advantageously about 3 to 100 degrees in the circumferential direction. Weakened portion) 20 is formed. Each of the pair of scores 20 extends in the axial direction from the upper end to the lower end of the restraint wall 18. It is convenient that a notch 22 (FIG. 5) is formed at the lower end of each of the pair of scores 20 for promoting the start of breaking when the score 20 is broken as described later. It is important that the upper ends of at least one thin reversal piece 16, two in the illustrated case, are connected to the constraining wall 18 between the pair of scores 20. Further, a protrusion 24 is formed on the outer peripheral surface of the restraint wall 18 between the pair of scores 20, and an opening ring 26 is connected to the protrusion 24. In other words, the outer peripheral surface of the constraining wall 18 is connected to the inner peripheral surface of the unsealing ring 26 via the protrusion 24. In the illustrated embodiment, the protrusion 24 has a substantially rectangular shape extending from the upper end to the lower end of the restraint wall 18, and the inner peripheral surface of the unsealing ring 26 is the lower end of the protrusion 24, and hence the lower end of the restraint wall 18. It is connected to the. The circular opening ring 26 surrounding the constraining wall 18 is inclined upward from the portion connected to the ridge 24 toward the opposite side in the diameter direction. The outer peripheral surface of the constraining wall 18 and the inner peripheral surface of the opening ring 26 are connected by a plurality of fracture connecting pieces 28 that are disposed at appropriate intervals in the circumferential direction. In the region opposite to the diametrical direction of the ridge 24, the fracture connecting piece 28 is not provided. When the container lid 2 is detached from the mouth and neck of the container as will be described later, the diametrical direction of the ridge 24 is opposite. Conveniently, it is possible to put the finger on the opening ring 26 sufficiently easily on the side. An annular protrusion 30 is formed at the upper end of the inner peripheral surface of the restraining wall 18.

  A pair of extending pieces 32 extending along the outer peripheral surface of the constraining wall 18 on both sides in the circumferential direction is attached to the protrusion 24 formed on the outer peripheral surface of the constraining wall 18 between the pair of scores 20. Yes. An engaging means 34 is formed on the inner surface of each extending end of each of the pair of extending pieces 32 so as to protrude radially inward. On the other hand, on the outer peripheral surface of the constraining wall 18, an engaged means 36 that is located opposite to the engaging means 34 and cooperates with the engaging means 34 is formed. In the illustrated embodiment, the engaged means 36 is constituted by a recess formed on the outer peripheral surface of the restraint wall 18. The engaging means 34 and the engaged means 36 cooperate to limit displacement of the circumferential outer portions of the pair of scores 20 in a direction away from the pair of scores 20 on both sides in the circumferential direction.

  Next, with reference to FIG. 6A thru | or FIG. 6D, the mode which equips the container neck 2 with the said container lid 2 is demonstrated. The container to which the container lid 2 is applied and which can be formed of glass or an appropriate synthetic resin has a mouth-and-neck part 38 that is cylindrical as a whole, and an annular engagement is provided at the upper end of the outer peripheral surface of the mouth-and-neck part 38. A stop ridge 40 is formed. An annular recess 42 is formed at the center in the axial direction of the annular locking protrusion 40. When mounting the container lid 2 on the mouth / neck portion 38, a mounting tool 44 including a cylindrical inner member 46 and a cylindrical outer member 48 surrounding the inner member 46 is used. The inner member 46 and the outer member 48 of the mounting tool 44 are moved up and down separately.

  When the container lid 2 is attached to the mouth / neck portion 38 of the container, as shown in FIG. 6A, the container lid 2 is first fitted on the mouth / neck portion 38, and the inner member 46 of the attachment tool 44 serves as the container lid 2. The outer member 48 is positioned so as to oppose the restraining wall 18 of the container lid 2. Next, as clearly understood by comparing FIGS. 6A and 6B, the inner member 46 is lowered to force the container lid 2 downward, and the seal 8 is placed at the upper end of the outer peripheral surface of the mouth neck portion 38. The mouth and neck portion 38 is sealed by being brought into close contact with each other. When the container lid 2 is lowered, the guide drooping piece 10 enters the mouth / neck portion 38, whereby the container lid 2 is positioned concentrically with respect to the mouth / neck portion 38. The axially intermediate portion of the guide drooping piece 10 is brought into contact with the inner peripheral surface of the mouth-and-neck portion 38, but the sealing of the mouth-and-neck portion 38 is established by the seal 8 in the illustrated embodiment. The lower portion of the skirt wall 6 is expanded outward in the radial direction, and the locking ridge 8 formed on the lower portion of the inner peripheral surface is positioned below the locking ridge 40 of the mouth and neck portion 38. In the state shown in FIGS. 6A and 6B, the lower portion of the skirt wall 6 can be expanded easily in the radial direction, and the pressing force required to lower the top wall 4 is not excessive. . If desired, when the inner member 46 is lowered to the position illustrated in FIG. 6B, the outer member 48 can also be lowered to the position illustrated by the two-dot chain line in FIG. 6B. Thereafter, as will be understood by referring to FIGS. 6C and 6D in conjunction with FIG. 6B, the outer member 48 is lowered and the restraint wall 18 is gradually lowered. At this time, the thin-walled reversal piece 16 is gradually reversed from a state extending between the skirt wall 6 and the restraining wall 18 to a state extending downward. Then, as shown in FIG. 6D, when the thin-walled reversal piece 16 is completely reversed, the restraint wall 18 is lowered to a position surrounding the skirt wall 6 and expanded radially outward. The lower portion of the skirt wall 6 is forcibly displaced inward in the radial direction, and the locking ridge 12 formed on the lower inner peripheral surface of the skirt wall 6 is locked to the locking ridge 40 of the mouth-and-neck portion 38. I'm damned. When the restraint wall 18 is lowered to the position shown in FIG. 6D, a force for expanding radially outward acts on the restraint wall 18, but the engaging means 34, the engaged means 36, Cooperate to limit displacement of the outer circumferential portions of the pair of scores 20 in a direction away from the pair of scores 20 on both sides in the circumferential direction, and therefore avoid breaking the pair of scores 20. (See FIGS. 1, 3 and 5).

  When the container lid 2 is removed from the container neck 38 and the container neck 38 is opened, a finger is placed on the unsealing ring 26 on the opposite side of the ridge 24 in the diametrical direction as shown in FIGS. 7A and 7B. The opening ring 26 is swung upward with the portion connected to the ridge 24 as a turning starting point. At this time, it is clearly shown that the breaking connection piece 28 is broken, and the opening operation is applied to the container lid 2. When the opening ring 20 is swung further upward, as shown in FIG. 7C, the pair of scores 20 formed on the restraint wall 18 is broken, and the thin inverted pieces 16 positioned between the pair of scores 20 are replaced with the top wall 4. The opening ring 26 is displaced upward together with the portion of the constraining wall 18 located between the pair of scores 20. At this time, as understood by comparing and referring to FIGS. 7B and 7C, the skirt wall at the upper end portion of the skirt wall 6, that is, the upper portion of the seal 8 from the re-inverted thin inverted piece 16. The seal 8 is effectively separated locally from the outer peripheral surface of the mouth-and-neck portion 38 by the tensile force applied to 6, and the pressure in the container is released when the inside of the container is in a pressurized state. At this time, since most of the locking ridges 12 of the skirt wall 6 are still locked to the locking ridges 40 of the mouth-and-neck portion 38, there is a possibility that the container lid 2 will accidentally fly. Absent. In the state shown in FIG. 6C, the restraint of the skirt wall 6 by the restraint wall 18 is locally released, and at least a part of the lower part of the skirt wall 6 is elastically displaced outward in the radial direction sufficiently easily. Therefore, the entire container lid 2 can be removed from the mouth / neck portion 38 of the container and the mouth / neck portion 38 can be opened sufficiently easily.

  In the embodiment described above, a pair of scores 20 is formed on the restraint wall 18, but if desired, instead of the pair of scores 20, an axis line from the upper end to the lower end of the restraint wall 18 as shown in FIG. 8. A pair of slits 120 extending in the direction can also be formed. In this case, although not necessarily required, each of the slits 120 has one or more fractured bridging portions 122 extending across the slit 120 in the circumferential direction, and in the illustrated embodiment, the slit 120. It is preferable to arrange three pieces at intervals in the extending direction. In such an embodiment, when the container neck 2 is detached from the mouth-and-neck portion 38 of the container and the mouth-and-neck portion 38 is opened, the break bridging portion 122 is broken and positioned between the pair of slits 120. The thin inversion piece 16 is re-inverted so as to extend upward beyond the top wall 4.

2: Container lid 4: Top wall 6: Skirt wall 8: Seal 14: Slit 16: Thin wall reversal piece 18: Restraint wall 20: Score 22: Notch 24: Projection 26: Opening ring 32: Extension piece 34: Engagement Means 36: Engagement means 38: Mouth and neck of container 40: Locking protrusion 120: Slit 122: Broken bridge

Claims (3)

A cylinder having a circular top wall and a skirt wall depending from the peripheral edge of the top wall, extending downward to the inner peripheral edge of the top wall and being in close contact with the upper end of the outer peripheral surface of the cylindrical mouth-neck of the container In a synthetic resin container lid in which a shaped seal is disposed, and a locking projection is formed on the inner peripheral surface of the skirt wall,
Connected to a boundary region between the outer peripheral surface of the skirt wall and the upper surface of the top wall, or a portion above the upper end of the cylindrical seal on the outer peripheral surface of the skirt wall, which is arranged in a plurality of intervals in the circumferential direction. A thin reversal piece extending upward from the lower end over the top wall, a cylindrical constraining wall connected to the upper end of the thin reversal piece, and an opening ring surrounding the constraining wall,
The constraining wall is formed with a pair of scores or slits extending in the central axis direction at intervals in the circumferential direction, and the outer peripheral surface of the constraining wall is interposed via a ridge located between the pair of scores or slits. Connected to the inner peripheral surface of the opening ring,
A synthetic resin container lid, characterized in that at least one upper end of the thin-walled inversion piece is connected to the constraining wall between the pair of scores or slits.   The synthetic resin container lid according to claim 1, wherein a lower end portion of the outer peripheral surface of the constraining wall is connected to the inner peripheral surface of the unsealing ring through the protrusion.   The protrusion is provided with a pair of extending pieces extending on both sides in the circumferential direction along the outer peripheral surface of the constraining wall, and is engaged with the inner surface of each extending end of the pair of extending pieces. Engaging means are formed on the outer circumferential surface of each of the pair of scores or slits on the outer peripheral surface of the constraining wall. Each of the engaging means and each of the engaged means In cooperation with each other to restrict displacement of the circumferential outer portions of each of the pair of scores or slits in the constraining wall in a direction away from the pair of scores or slits on both sides in the circumferential direction. The synthetic resin container lid according to 1 or 2.

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