JP5995481B2 - Plastic container lid - Google Patents

Description

  According to the present invention, when the container lid is tightened, the locking means formed on the inner peripheral surface of the tamper evidence skirt extends over the locking jaw formed on the neck of the container mouth so that the locking jaw It is related with the synthetic resin container lid latched by the part.

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 disclosed in Patent Document 1 has a cylindrical mouth-and-neck part, and a male thread and a locking jaw part located below the male thread are formed on the outer peripheral surface of the mouth-neck part. ing. 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. A female thread is formed on the inner peripheral surface of the main part of the skirt wall, and is threaded into the inner peripheral surface of the skirt wall tamper evidence hem. A plurality of shaped locking projections are formed.

After the beverage is filled in the container, the container lid is fitted on the mouth and neck of the container, the container lid is rotated in the closing direction, and the female thread on the container lid is screwed onto the male thread on the mouth and neck. Attach a container lid to the neck and seal the mouth and neck. The locking protrusion disposed on the skirt wall tamper-evidence skirt is elastically over the locking jaw of the mouth and neck when mounted, 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. Then, the container lid rises with respect to the mouth and neck in response to the unscrewing of the female thread and the male thread, and when the container lid rises somewhat, it is disposed at the tamper evidence skirt of the skirt wall. The latching protrusion is locked to the lower surface of the locking jaw portion of the mouth-neck portion, thereby preventing the tamper evidence skirt from rising.
When the container lid continues to rotate in the opening direction, the break line is broken by the stress generated in the break line formed on the skirt wall, and the skirt wall tamper evidence skirt is separated from the main part. When the container lid continues to rotate in the opening rotation direction, the tamper evidence skirt remains, the container lid is detached from the mouth and neck, and the mouth and neck are opened.

Japanese Patent Application Laid-Open No. 2011-143842

The maximum outer diameter of the locking jaw formed on the mouth and neck and the inner diameter of the locking protrusion formed on the tamper evidence skirt are smaller than the minimum inner diameter of the locking protrusion. Therefore, at the time of tightening, when the locking projection gets over the locking jaw, the locking projection (and the tamper evidence hem) expands radially outward from the main portion. . The main part and the tamper-evidence hem part are connected by a bridging part (bridge) provided in the breaking line, so that the bridging part is cut off when the locking projection jumps over the locking jaw part. There is a risk that.
If the bridging portion is cut, the tamper evidence skirt cannot perform its function, and the container once the container lid is opened cannot be distinguished from the container before use.
The present invention has been made in view of such circumstances, and a synthetic resin container lid that prevents the bridging portion that connects the main portion and the tamper evidence hem portion from being broken at the time of winding is provided. The purpose is to provide.

To achieve the above object, a synthetic resin container lid of the present invention comprises a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and the skirt wall has a plurality of bridging portions. A rupture line that is formed between slits located between the bridging portions and extends in the circumferential direction is formed, and the skirt wall is divided into a main portion above the rupture line and a tamper evidence skirt below the rupture line. is capable screwed into Onishi strip formed on the outer peripheral surface of the mouth-and-neck portion of the container on the inner peripheral surface of the main portion internal thread is formed,
The inner peripheral surface of the tamper evidence hem is provided with a locking means that is locked to the bottom surface of the locking jaw that protrudes outward from the outer peripheral surface of the mouth and neck of the container, and the mouth and neck of the container In the synthetic resin container lid in which the container is mounted on the mouth-and-neck part when the locking means climbs over the locking jaw part when tightening to the part,
On the inner peripheral surface of the tamper evidence hem, between the breaking line and the locking means, the inner peripheral surface protrudes radially inward and is formed on the outer peripheral surface of the locking jaw. A restricting means that can be engaged with a substantially frustoconical tapered surface is provided, and the restricting means is a plurality of restricting flaps extending radially inward from the inner peripheral surface of the tamper evidence skirt,
During seaming to the mouth and neck of the container, at least before said locking means gets over the locking jaw portion, the regulating flap in contact with the tapered surface of the locking jaws, after tightening The restriction flap extends upward inward in the radial direction from the inner peripheral surface of the tamper evidence skirt, and the lower surface of the restriction flap contacts the tapered surface .
The regulating flap of the plastic container closure is wound prior to tightening, preferably Tei Rukoto extends downwardly radially inwardly from the inner peripheral surface of the tamper evident bottom portion.
After the container lid made of the synthetic resin is wrapped around the mouth and neck of the container, the tamper evidence skirt and the locking jaw are the taper of the lower surface of the regulating flap and the locking jaw. It is preferable to contact only with the surface.
The locking means of the synthetic resin container lid is a plurality of bead-shaped protrusions formed in the circumferential direction of the tamper-evidence skirt, and the regulation flap is made to correspond to the circumferential position of the protrusion. It is preferable to form.

The inner peripheral surface of the tamper evidence hem of the synthetic resin container lid of the present invention projects radially inward of the inner peripheral surface between the break line and the locking means, and the outer periphery of the locking jaw A plurality of regulating flaps extending inward in the radial direction from the inner peripheral surface of the tamper evidence skirt. There,
In winding during tightening of the container neck, said locking means at the same time is overcome before or get over the locking jaw portion, the regulating flap in contact with the tapered surface of the locking jaws, after tightening The restricting flap extends upward inward in the radial direction from the inner peripheral surface of the tamper evidence skirt, and the lower surface of the restricting flap is in contact with the tapered surface. When the tamper evidence skirt is moved inward and downward over the locking jaw, the regulating flap serves as a stopper, and the movement can be suppressed.
When removing the container lid, the elastic regulating flap tries to return to its original shape, and the regulating flap presses the upper taper surface of the latching jaw, so that there is a gap between the locking means and the regulating flap. As a result, the tamper evidence skirt can be prevented from wobbling so that the main part of the container lid can be prevented from being removed without breaking the bridging portion.

It is a half section front view of the synthetic resin container lid of the present invention. It is a half section half front view of the state where the synthetic resin container lid of the present invention was attached to the mouth neck of the container. It is a bottom view of the synthetic resin container lid shown in FIG. The synthetic resin container lid of the present invention shows a stage where the mouth and neck are tightened, A is a cross-sectional view of the state where the inner seal piece of the synthetic resin container lid is in contact with the upper part of the mouth and neck, B is Sectional view of the state in which the protrusion of the synthetic resin container lid is in contact with the locking jaw, C is the locking flap when the protrusion of the synthetic resin container lid is about to get over the locking jaw A sectional view in a state of contact with the portion, D is a sectional view in a state where the regulation flap of the synthetic resin container lid is bent upward, and E is a synthetic resin container lid mounted on the mouth and neck. It is sectional drawing which shows a state. It is an enlarged view of the periphery of the regulation flap before the synthetic resin container lid of this invention is mounted | worn with a mouth neck part. A comparative example shows a stage where a synthetic resin container lid is wound around the mouth and neck, A is a cross-sectional view of a state in which a protrusion of the synthetic resin container lid is in contact with a locking jaw, and B is a synthetic Sectional drawing of the state in which the resin container lid is further tightened, and C is a sectional view showing a state in which the protruding portion of the synthetic resin container lid gets over the locking jaw.

Hereinafter, a synthetic resin container lid according to an embodiment of the present invention will be described with reference to the drawings.
Referring to FIGS. 1 to 3, a container lid 2 formed by integral molding from an appropriate synthetic resin such as polyethylene or polypropylene by injection molding or compression molding includes a circular top wall 4 and a peripheral edge of the top wall 4. And a cylindrical skirt wall 6 depending from. 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 side 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.

A rupture line 16 extending in the circumferential direction is formed in the skirt wall 6, and the skirt wall 6 is partitioned into a main portion 18 above the break line 16 and a tamper evidence skirt 20 below the break line 16. ing. In the illustrated embodiment, the fracture line 16 extends in the circumferential direction at intervals in the circumferential direction, and remains between a plurality of slits (cut grooves) 22 formed by cutting with a cutter or the like and the slits 22. A plurality of bridging portions 24 are included.
On the outer peripheral surface of the main portion 18 of the skirt wall, a non-slip knurl 26 is formed which is formed of uneven shapes alternately present in the circumferential direction. A female thread 28 is formed on the inner peripheral surface of the main portion 18 of the skirt wall 6.

The tamper evidence skirt portion 20 is connected to the main portion 18 via a plurality of bridging portions 24. Locking means 30 and restricting means 29 are disposed on the inner peripheral surface 27 of the tamper evidence skirt 20, and the locking means 30 is disposed below the restricting means 29.
In the illustrated embodiment, the locking means 30 is composed of five pieces of protrusions 32 arranged at intervals in the circumferential direction and arranged in parallel in the circumferential direction. Each protrusion 32 has the same shape, and the vertical cross-sectional shape of each intermediate portion (excluding both end portions) of the protrusion 32 is a substantially right triangle shape in which the apex protrudes radially inward of the inner peripheral surface 27. The boundary (corner) part of the protrusion 32 from the inner peripheral surface 27 is formed by a relatively small curved surface, and extends from the curved surface substantially horizontally to the inside of the radius, and from the inner end of the upper surface 34 via an arcuate curved surface. And a lower tapered surface 36 composed of an inverted truncated cone surface extending radially outwardly downward. In the present embodiment, the locking means 30 has protrusions 32 having the same shape formed at equal angular intervals in the circumferential direction (FIG. 3).
In the present embodiment, the restricting means 29 is a plurality of restricting flaps 31 formed at equal angular intervals in the circumferential direction of the inner peripheral surface 27 of the tamper evidence skirt 20, and radially inward from the inner peripheral surface 27. It is formed to extend downward toward the direction. In the present embodiment, each regulating flap 31 has the same size and shape, and is formed with five pieces corresponding to the position of the protrusion 32. As shown in FIG. The center position in the direction (indicated by the axis O) and the center position O in the circumferential direction of the one regulation flap 31 are made to coincide.

In FIG. 2, the mouth and neck portion 40 of the container 39 is shown together with the container lid 2. The mouth and neck portion 40 of the container which can be formed from an appropriate synthetic resin such as polyethylene terephthalate, glass or a metal thin plate has a cylindrical shape as a whole. A locking jaw 44 is formed below the screw 42.
With reference to FIGS. 2 and 5, the locking jaw portion 44 has an upper tapered surface 46 formed of a truncated cone-shaped tapered surface whose outer diameter gradually increases downward, and a lower portion from the outer peripheral end of the upper tapered surface 46 ( It has a large diameter portion 48 extending substantially vertically) and a bottom surface 50 extending substantially horizontally. Further provided on the outer peripheral surface of the mouth / neck portion 40 is a support ring 52 located below the locking jaw portion 44 (the support ring 52 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 40 after the contents are filled in the container and the mouth and neck portion 40 is sealed, the container lid 2 is fitted on the mouth and neck portion 40 and the container lid 2 is closed. The female thread 28 of the container lid 2 is screwed into the male thread 42 of the mouth-and-neck part 40 by rotating in the rotational direction. When the female thread 28 is screwed into the male thread 42 until the state shown in FIG. 2, the inner seal piece 8 of the container lid 2 enters the mouth neck 40 and is brought into close contact with the inner peripheral surface of the mouth neck 40. The annular ridge 9 is brought into intimate contact with the top surface of the mouth-and-neck portion 40, and the outer seal piece 10 is brought into intimate or close proximity to the outer peripheral surface of the mouth-and-neck portion 40. As a result, the mouth-and-neck portion 40 is sealed. The protrusion 32 disposed on the inner peripheral surface 27 of the tamper evidence skirt 20 elastically engages the locking jaw 44 of the mouth and neck 40 (ie, by elastic deformation or displacement of the tamper evidence skirt 20). It gets over and is located below the locking jaw 44. On the other hand, the regulation flap 31 is positioned above the locking jaw 44 and is inverted from the base end portion 53 or the intermediate portion and bent upward, so that the lower surface 51 contacts the upper tapered surface 46.

  Further, in a state where the container lid 2 is attached to the mouth / neck portion 40, a gap is formed between the inner peripheral surface 27 (reference surface) of the tamper evidence skirt 20 and the locking jaw 44, and the protrusion A gap is formed between 32 and the locking jaw 44. The contact between the tamper evidence skirt 20 and the locking jaw 44 is only on the lower surface 51 of the regulating flap 31 and the upper taper surface 46 of the locking jaw 44.

Here, the details of the regulation flap 31 will be further described.
The restricting flap 31 is provided to prevent the bridging portion 24 from breaking in the breaking line 16 when the locking means 30 (projection 32) gets over the locking jaw 44 when the container lid 2 is tightened. It has been.
The inventors analyzed the mechanism by which the bridging portion 24 is broken when the protrusion 32 gets over the locking jaw 44 before the restriction flap 31 is conceived. The mechanism will be described in the following comparative example. In addition, the code | symbol attaches | subjects the same code | symbol as embodiment of this invention.
6A to 6C, when attention is paid to one cross section of the mouth and neck portion 40, the female thread 28 rotates along the male thread 42, and the upper surface of the male thread 42 is initially rotated when the container lid 2 is rotated. Then, when the protrusion 32 comes into contact with the locking jaw 44, the female thread 28 is positioned on the lower surface of the male thread 42 (A in FIG. 6). When the container lid 2 further rotates and moves downward relative to the mouth and neck portion 40, the lower end of the female thread 28 comes into contact with the upper surface of the male thread 42. At this time, the protrusion 32 rides on the large-diameter portion 48 of the locking jaw portion 44, and the tamper evidence skirt portion 20 is curved radially outward (B in FIG. 6).

  When the container lid 2 further moves downward relative to the mouth / neck portion 40 from this state, the protrusion 32 gets over the large-diameter portion 48 of the locking jaw portion 44 and below the lower tapered surface 36. It tries to move instantaneously (C in FIG. 6). On the other hand, the female thread 28 is brought into close contact with the upper surface of the male thread 42. Therefore, a downward force is generated on the skirt wall by the cooperation of the locking jaw portion 44 and the protrusion 32 that has passed over this, and the male screw 42 and the female screw 28 that is in close contact with the upper side are cooperated. As a result, an upward force is applied to the skirt wall, and thus it is found that excessive stress is generated in the bridging portion in the breaking line and the bridging portion tends to be broken.

  That is, as described above, the tamper evidence skirt 20 moves downward with the momentum of the protrusion 32 formed on the tamper evidence skirt 20 curved outwardly over the locking jaw 44. The main portion 18 is restricted from moving downward with the lower surface of the female thread 28 engaged with the upper surface of the male thread 42. Therefore, the main part cannot follow the movement of the tamper-evidence skirt part 20 and is maintained in its position as it is, and only the tamper-evidence skirt part 20 is lowered downward, and in addition, the tamper-evidence hem that has been extended outwardly. The diameter of the portion 20 is reduced on the contrary. As a result, the bridging portion 24 is broken.

Hereinafter, it returns to this embodiment.
Therefore, in the present embodiment, a regulation flap 31 is provided for preventing breakage of the break line 16.
The regulation flap 31 will be described in detail with reference to FIGS. 4 and 5. The regulation flap 31 is formed integrally with the container lid 2. The regulating flap 31 protrudes inward and downward from the inner peripheral surface 27 in a bowl shape, and both the upper surface and the lower surface are formed in a virtual circle having an inverted frustoconical surface. In this embodiment, it is preferable that the proximal end side is formed thinner than the distal end side from the viewpoint of reversibility at the time of mounting, but the thickness of the regulation flap 31 is thicker on the proximal end 53 side, and the distal end portion The 54 side can also be formed thin, and the entire thickness can be the same. Since the regulation flap 31 is bent upward along the upper taper surface 46 after the upper taper surface 46 and the distal end portion 54 are in contact with each other, a guide surface is formed so that the shape of the distal end portion 54 is bent upward. In order to make it easy to bend, the tip end portion 54 may be bent inward (not shown).
Further, the inner diameter (virtual circle in an unloaded state) of the distal end portion 54 is formed to be smaller than the outer diameter of the large diameter portion 48 which is the maximum diameter of the locking jaw portion 44, so When tightened, the regulation flap 31 needs to be in contact with the upper tapered surface 46.
Further, in the present embodiment, the regulating flap 31 is formed with five pieces in the circumferential direction corresponding to the position of the protrusion 32, and as shown in FIG. 3, the circumferential center position (axis O And the center position in the circumferential direction of one piece of the regulating flap 31 are made to coincide with each other.

The operation of the regulation flap 31 of the present invention is as follows. The process until the protrusion 32 reaches the locking jaw 44 is the same as that in the comparative example, and the description will be made from the point before the protrusion 32 gets over the locking jaw 44.
When the container lid 2 moves downward relative to the mouth-and-neck portion 40, the tamper-evident hem portion 20 is initially in a non-contact state between the protrusion 32, the regulation flap 31, and the locking jaw portion 44. (A in FIG. 4). The tamper evidence skirt 20 is not subjected to a load extending outward.
When the lower taper surface 36 of each protrusion 32 and the upper taper surface 46 of the locking jaw are in contact with each other, and the lower taper surface 36 slides on the upper taper surface 46, the tamper evidence skirt 20 gradually moves. The diameter is expanded outward (B in FIG. 4). Each regulating flap 31 comes into contact with the upper tapered surface 46 after or before the arcuate curved surface at the inner end of the protrusion 32 reaches the large diameter portion 48.

From this state, as each projection 32 reaches the large-diameter portion 48 so as to get over the locking jaw portion 44, the tamper-evidence skirt portion 20 further expands so as to bend and expand radially outward. (C in FIG. 4). Then, shear force is generated between the main portion 18 and the tamper evident bottom portion 20 of the container closure 2, that written force extending outwardly bridge 24 breaking line. Further, when the container lid 2 moves downward, the tip of the upper surface 34 of the protrusion 32 reaches the large diameter portion 48, and the shearing force is further increased.
When the regulating flap 31 is brought into contact with the upper tapered surface 46 relatively quickly, the leading end 54 of the regulating flap 31 comes into contact with the upper tapered surface 46 and bends so that the upper tapered surface 46 extends upward. . And if the protrusion 32 gets over the latching jaw part 44, the control flap 31 will be bent further and the lower surface 51 will be in the state which contacted the upper taper surface 46 (D of FIG. 4). As described above, when the restriction flap 31 is brought into contact with the upper taper surface 46 relatively quickly, initially, the load on the restriction flap 31 on the tip portion 54 side of the restriction flap 31 is reduced so as to reduce the load. The elastic force is increased (softened), and when the protrusion 32 gets over the locking jaw 44, the elastic force on the intermediate side is decreased (hardened) so that the rapid movement of the tamper evidence skirt 20 is suppressed. May be. In this case, as an example, the front end portion 54 side of the regulation flap 31 may be formed thin and the intermediate portion and base end portion 53 side may be formed thick.

On the other hand, when the restriction flap 31 is brought into contact with the upper taper surface 46 slowly, the front end portion 54 of the restriction flap 31 is engaged with the locking jaw just before (or when) the protrusion 32 gets over the locking jaw 44. It abuts on the upper tapered surface 46 of the portion 44. And if the protrusion 32 gets over the latching jaw part 44, the restriction | limiting flap 31 will bend from the base end part 53, the taper surface of the upper taper surface 46 of the latching jaw part 44 may be along an upper side, The lower surface 52 of the regulating flap 31 is in contact with the upper tapered surface 46.
As described above, when the restriction flap 31 is brought into contact with the upper taper surface 46 relatively slowly, initially, the elasticity of the restriction flap 31 on the front end portion 54 side is increased so that the load on which the restriction flap 31 presses the upper taper surface 46 is increased. The force may be relatively small (hard) so that the rapid movement of the tamper evidence skirt 20 may be suppressed when the protrusion 32 gets over the locking jaw 44. In this case, as an example, the distal end portion 54 side and the proximal end portion 53 side of the regulation flap 31 may be formed thick with a substantially constant thickness.
Thus, the regulation flap 31 suppresses the momentary extension of the bridging portion 24 by the deformation force and the elastic force, and the timing of contact between the regulation flap 31 and the locking jaw portion 44 is important. Therefore, before the protrusion 32 rides over the locking jaw 44, the restriction flap 31 comes into contact with the upper tapered surface 46 of the locking jaw 44 at the same time.

The tamper evidence skirt 20 tends to move inward and downward when it passes over the locking jaw 44, but the elastic deformation due to the bending of the regulating flap 31 prevents the tamper evidence skirt 20 from moving suddenly downward. In addition, the elastic force plays a role as a cushioning material.
Thus, by forming the regulation flap 31, the force pulling the bridging portion 24 of the breaking line 16 is reduced, the elongation of the bridging portion 24 is suppressed, and the bridging portion 24 is prevented from being broken.
In particular, in the present embodiment, the regulating flap 31 is formed with five pieces in the circumferential direction in correspondence with the position of the protrusion 32, and as shown in FIG. O) and the circumferential center position of one piece of the regulating flap 31. Since the tamper evidence skirt 20 extends outward at a position where the center position O is present, the center position O of the regulating flap 31 is positioned at the center position O of the protrusion 32, so that the tamper evidence skirt 20 is relatively provided at that position. Breakage of the bridging portion 24 having a large elongation can be effectively prevented.

  At the same time, the tamper evidence skirt 20 has an almost equal force on the upper taper surface 46, which is a substantially circular taper surface, by the elastic force of the plurality of regulating flaps 31 arranged at equal intervals in the circumferential direction. It is possible to maintain the centering of the container lid 2 at the time of winding. As a result, the inclination of the tamper evidence skirt 20 can be prevented, and the axis of the tamper evidence skirt 20 can be aligned with the axis of the container lid 2. By making the axes coincide with each other, it is possible to prevent breakage of the break line 16 caused by part of the bridging portion 24 being pulled by tilting the axis of the tamper evidence skirt 20 to one side.

In addition, after the container lid 2 is tightened, the regulation flap 31 is in close contact with the upper taper surface 46 of the locking jaw portion 44, and the lower surface 51 of the regulation flap 31 makes the upper taper surface 46 of the locking jaw portion 44 elastic. Therefore, the tamper evidence skirt 20 can be prevented from rattling.
Therefore, when the container lid 2 is opened, the lower surface 51 of the regulating flap 31 is in close contact with the upper taper surface 46 of the locking jaw 44 at the initial stage of rotating the container lid in the opening direction. Since the flap 31 has elasticity, the required initial torque does not become excessive.
Further, when the protrusion 32 of the tamper evidence skirt 20 is locked to the bottom 50 of the locking jaw 44 by further rotating in the opening rotation direction, the lower surface 51 of the regulating flap 31 will be elastically restored. Since the force which acts and maintains the state which presses down the upper taper surface 46 of the latching jaw part 44, the tamper evident bottom part 20 is prevented from rattling and a bridge part is fractured | ruptured reliably. It can be done.
Accordingly, the present invention smoothly curves without forming a bead or the like at the boundary between the inner peripheral surface 27 of the tamper evidence skirt 20 and the protrusion 32, and the boundary and the locking jaw 44. And the frictional force at the time of winding or opening can be reduced, and the main portion 18 can be removed from the container mouth without breaking the bridging portion when opening. There is no withdrawal.
However, in addition to the above-described embodiment, a bead or the like is provided at the boundary between the inner peripheral surface 27 of the tamper evidence skirt 20 and the protrusion 32 so that the bridging portion can be more reliably broken during opening. It is also possible.

The present invention has been described in detail based on the embodiments with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and other modifications can be made without departing from the scope of the present invention. Or it can be changed.
For example, in the above-described embodiment, the direction of the front end side of the regulation flap 31 is directed downward from the inner peripheral surface 27 of the tamper evidence skirt 20, but the timing when the protrusion 32 gets over the locking jaw 44 is used. It is possible to change the shape and orientation of the regulating flap 31 on the precondition that they are matched.
For example, the direction of the regulation flap may be the horizontal direction, and the regulation flap may be engaged with the outer peripheral portion of the locking jaw.

2 container closure 4 covering panel 6 skirt wall 16 broken line 18 main portion 20 tamper evident bottom portion 24 bridges junction 27 inner peripheral surface 28 Mesunishi Article 29 regulating means 30 locking means 31 regulating flap 32 projection 34 top 36 bottom tapered surface 39 container 40 neck neck 42 Onishi Article 44 engaging jaw portion 46 above the tapered surface 48 large diameter portion 50 bottom surface 51 lower surface 53 proximal end 54 distal end

Claims (4)

It comprises a circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall, and the skirt wall comprises a plurality of bridge portions and slits located between the bridge portions, and is a fracture extending in the circumferential direction A line is formed, and the skirt wall is divided into a main portion above the break line and a tamper evidence skirt below the break line, and an inner peripheral surface of the main portion is an outer periphery of the mouth and neck portion of the container screwed possible internal thread in Onishi strip formed on the surface is formed,
The inner peripheral surface of the tamper evidence hem is provided with a locking means that is locked to the bottom surface of the locking jaw that protrudes outward from the outer peripheral surface of the mouth and neck of the container,
In the synthetic resin container lid in which the container is mounted on the mouth-neck portion when the container is wrapped around the mouth-neck portion, the locking means gets over the locking jaw portion,
On the inner peripheral surface of the tamper evidence hem, between the breaking line and the locking means, the inner peripheral surface protrudes radially inward and is formed on the outer peripheral surface of the locking jaw. Provide a restricting means that can be engaged with a substantially frustoconical tapered surface
A plurality of regulating flaps extending radially inward from the inner circumferential surface of the tamper evidence skirt,
During seaming to the mouth and neck of the container, at least before it said locking means gets over the locking jaw portion, the regulating flap in contact with the tapered surface of the locking jaws,
After tightening, the regulating flap extends upward inward in the radial direction from the inner circumferential surface of the tamper evidence skirt, and the lower surface of the regulating flap is in contact with the tapered surface Resin container lid. The regulating flap, before tightening, plastic container closure according to claim 1 which extends downward from the inner peripheral surface of the tamper evident bottom portion radially inward. After the container is tightened around the mouth and neck, the tamper evidence hem and the locking jaw are in contact with only the lower surface of the regulating flap and the tapered surface of the locking jaw. The synthetic resin container lid according to claim 1 or 2.   The locking means is a plurality of bead-shaped protrusions formed in a circumferential direction of a tamper evidence skirt, and the restriction flap is formed corresponding to a circumferential position of the protrusion. The synthetic resin container lid in any one of 1-3.

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