JP2015182809A - synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug type synthetic resin container lid capable of being sufficiently and surely attached while being attached with a relatively small pugging force.SOLUTION: A plurality of thin wall reverse pieces 16 extending upward over a top wall 4 and connected to a skirt wall 6 are arranged at intervals in the circumferential direction, a cylindrical binding wall 18 is connected to the upper edge thereof, and an opening ring 26 surrounding the binding wall is arranged. The binding wall is formed with a pair of 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. The projection is provided with a pair of extension pieces 32 extending to circumferential direction both sides along the outer peripheral surface of the binding wall, and each extension end part inner surface of the pair of extension pieces is formed with engaging means 34 projecting inward in a radial direction, and on the other hand, each circumferential outside of the pair of slits in the outer peripheral surface of the binding wall is formed with engaged means 36. At least one upper edge of the thin wall reverse piece is connected to the binding wall between the pair of 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 diligent study, the inventors of the present invention circulated a thin-walled reversal piece extending upward from the lower end connected to the outer peripheral surface of the skirt wall or the boundary between the outer peripheral surface of the skirt wall and the upper surface of the top surface wall and beyond the top surface wall. A plurality of thin-walled inversion pieces are connected to a cylindrical constraining wall at the upper end, and an opening ring surrounding the constraining wall is disposed. The constraining wall is spaced in the circumferential direction. Forming a pair of slits extending in the central axis direction, connecting the outer peripheral surface of the constraining wall to the inner peripheral surface of the opening ring via a ridge located between the pair of slits, and further connecting the outer periphery of the constraining wall to the ridge A pair of extending pieces extending along the surface on both sides in the circumferential direction is provided, and an engaging means is formed on the inner surface of each of the extending end portions of the pair of extending pieces. Engagement means is formed on the outer side in the circumferential direction of each of the slits and engaged with each of the engagement means Each of the steps cooperates with each other so that the circumferential outer side of each of the pair of slits in the constraining wall is restricted from being displaced in a direction away from the pair of slits on both sides in the circumferential direction. It has been found that the main technical problem can be achieved by a uniquely shaped container lid in which at least one upper end of the reversal piece is connected to a constraining wall between a pair of 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, and the inner peripheral surface of the skirt wall In a synthetic resin container lid in which a stop ridge is formed,
A plurality of thin-walled reversal pieces that are disposed at intervals in the circumferential direction and extend upward from the lower end connected to the outer peripheral surface of the skirt wall to the outer peripheral surface of the top-surface wall, A cylindrical constraining wall connected to the upper end, and an opening ring surrounding the constraining wall;
The constraining wall is formed with a pair of slits extending in the central axis direction at intervals in the circumferential direction,
A ridge is formed between the pair of slits on the outer peripheral surface of the constraining wall, and the opening ring is connected to the constraining wall via the ridge,
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. Engaging means projecting inward are formed, and engaged means are formed on the outer circumferential surface of each of the pair of slits on the outer peripheral surface of the constraining wall. Each of the engaging means cooperates with each other to restrict displacement of the outer circumferential portion of each of the pair of slits in the constraining wall in a direction away from the pair of slits on both sides in the circumferential direction,
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 slits.

  Each of the slits is preferably provided with one or more fractured bridging portions extending across the slit in the circumferential direction. The opening ring is preferably connected to the lower end portion of the constraining wall via the protrusion.

  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, the thin inverted piece positioned between the pair of slits is re-inverted (that is, restored to its original state) to extend upward. Further, when the opening ring is further forced upward, the skirt wall is displaced radially outward in a part where the restraint is released by the reversing thin-walled reversal piece, and most of the skirt wall is still restrained by the restraining wall. In this state, the pressure in the container is released (this surely prevents the container lid from flying), and when the opening ring is further forced upward, the container lid is detached 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. FIG. 2 is a partial perspective view showing a pair of slits in the container lid shown in FIG. 1. 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.

  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 further has a thin inversion piece 16 extending upward from the lower end connected to the outer peripheral surface of the skirt wall 6 or the boundary between the outer peripheral surface of the skirt wall 6 and the upper surface of the top wall 4 beyond the top wall 4. It is important that a plurality are arranged at intervals in the circumferential direction. 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 together with FIG. 1 and FIG. 3, the constraining wall 18 has a pair of slits 20 at an angular interval that is conveniently about 3 to 100 degrees in the circumferential direction. It is important that it is formed. Each of the pair of slits 20 extends in the axial direction from the upper end to the lower end of the restraint wall 18. Although not necessarily required for each of the pair of slits 20, one or a plurality of fractured bridging portions 22 extending across the slits 20 in the circumferential direction, in the illustrated embodiment, the extension of the slits 20. It is preferable that three are arranged at intervals in the current direction. 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 slits 20. Further, a protrusion 24 is formed on the outer peripheral surface of the restraining wall 18 between the pair of slits 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 slits 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 the displacement of the outer circumferential portion of the pair of slits 20 in the direction away from the pair of slits 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 the displacement of the outer circumferential portions of the pair of slits 20 in the direction away from the pair of slits 20 on both sides in the circumferential direction. Therefore, the width of the pair of slits 20 is increased and the fracture occurs. It is avoided that the bridging portion 22 is broken (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 break bridging portion 22 disposed in the pair of slits 20 formed in the restraint wall 18 is broken, and the gap between the pair of slits 20 is broken. The thin-walled reversing piece 16 positioned at the position is re-inverted so as to extend upward beyond the top wall 4, and the opening ring 26 is displaced upward together with the portion located between the pair of slits 20 of the restraining wall 18. At this time, as understood by comparing and referring to FIGS. 7B and 7C, the seal 8 is brought into contact with the upper end of the neck portion 38 by the tensile force applied to the upper end portion of the skirt wall 6 from the re-inverted thin inverted piece 16. When the container is locally separated from the outer peripheral surface and the inside of the container is in a pressurized state, the pressure in the container is released. 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 order to apply a tensile force to the skirt wall 6 from the reversed thin-walled reversal piece 16 to effectively separate the seal 8 locally from the outer peripheral surface of the mouth-and-neck portion 38, the lower end of the thin-walled reversal piece 16 is It is convenient to be connected to the upper end of the outer peripheral surface of the skirt wall 6 or the boundary between the outer peripheral surface of the skirt wall 6 and the upper surface of the top wall 4. 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.

2: Container lid 4: Top wall 6: Skirt wall 8: Seal 14: Slit 16: Thin-walled reversal piece 18: Restraint wall 20: Slit 22: Broken bridge portion 24: Projection 26: Opening ring 32: Extension piece 34 : Engaging means 36: engaged means 38: mouth / neck part of container 40: locking protrusion

Claims (3)

In a synthetic resin container lid comprising a circular top wall and a skirt wall depending from the peripheral edge of the top wall, and a locking protrusion formed on the inner peripheral surface of the skirt wall,
A plurality of thin-walled reversal pieces that are disposed at intervals in the circumferential direction and extend upward from the lower end connected to the outer peripheral surface of the skirt wall to the outer peripheral surface of the top-surface wall, A cylindrical constraining wall connected to the upper end, and an opening ring surrounding the constraining wall;
The constraining wall is formed with a pair of slits extending in the central axis direction at intervals in the circumferential direction,
A ridge is formed between the pair of slits on the outer peripheral surface of the constraining wall, and the opening ring is connected to the constraining wall via the ridge,
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. Means are formed, and engaged means are formed on the outer circumferential surface of each of the pair of slits on the outer peripheral surface of the restraining wall, and each of the engaging means and each of the engaged means is Cooperating with each other to restrict displacement of the outer circumferential portion of each of the pair of slits in the constraining wall in a direction away from the pair of slits on both sides in the circumferential direction,
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 slits.   The synthetic resin container lid according to claim 1, wherein each of the slits is provided with one or more fractured bridging portions extending across the slit in a circumferential direction.   The synthetic resin container lid according to claim 1 or 2, wherein the opening ring is connected to a lower end portion of the restraint wall through the protrusion.

Images