WO2019058550A1 - Synthetic resin cap and container - Google Patents

Abstract

Provided are a synthetic resin cap and a container that are capable of preventing inversion of a locking piece, broadening the locking margin of the locking piece in relation to an annular protrusion, and reliably breaking an annular weakened section at the time of opening. The cap 1 comprises: a skirt wall 3 having a female screw 5 provided therein that screws onto a male screw M1 formed on the outer circumference of a container mouth M; and a tamper evidence band 9 coupled to a lower section of the skirt wall via an annular weakened section 10. A plurality of locking pieces 11 that are capable of locking, from below, to an annular protrusion M2 provided in the outer circumference of the container mouth are provided on the inner circumference side of the tamper evidence band, with spaces therebetween in the circumferential direction. At least some of the plurality of locking pieces form a pair with only one out of adjacent locking pieces and have a protruding section 12 on the tip thereof. Protruding sections provided in locking pieces forming a pair are provided at positions mutually closer to the protruding section of the pair of locking pieces and are not provided at positions on the opposite side. A plurality of pairs are provided.

Description

Synthetic resin cap and container

The present invention relates to, for example, a synthetic resin cap attached to the mouth of a container for containing contents such as beverages, and a container provided with the same.

As a cap attached to the mouth of the container which stores contents, such as a drink, what was constituted widely in order to be able to check the existence of opening at a glance is used widely. An example of such a conventional cap is shown in FIGS. 5A and 5B (see Patent Document 1). This cap has a cap body 55 having a skirt wall 54 provided with an internal thread 53 screwed to the external thread 52 of the container opening M, and a tamper evidence band connected to the lower portion of the skirt wall 54 via an annular weakening portion 56 And 57. On the inner peripheral side of the tamper evidence band 57, a plurality of locking pieces 59 that can be locked from below to the annular projection 58 provided on the outer periphery of the container opening M are provided at intervals in the circumferential direction. The tip of the piece 59 is provided with a protrusion 60 positioned on the outer peripheral side of the annular protrusion 58 when the cap is attached to the container opening M.

Assuming that the projecting portion 60 is not provided on the above-mentioned cap, there is a risk that when the locking piece 59 facing upward is locked to the annular projection 58 at the time of opening, the reaction force may be reversed downward by the reaction force. When such an inversion occurs, the locking of the locking piece 59 to the annular projection 58 is released, the opening is completed without the annular weakening portion 56 breaking, and the opening of the annular weakening portion 56 is opened based on the presence or absence of breakage. It becomes impossible to judge the presence or absence. That is, the inversion of the locking piece 59 becomes a problem.

In this respect, in the above-described cap shown in FIGS. 5A and 5B, inversion of the locking piece 59 at the time of opening is prevented by the abutment of the projection 60 with the annular projection 58.

Patent No. 6061357 gazette

However, in the above-mentioned cap, although the protrusion 60 prevents the reversal of the locking piece 59 as described above, by providing the protrusion 60, the locking margin of the locking piece 59 with respect to the annular projection 58 (locking Area) will be narrowed. In particular, as described in Patent Document 1, in a state where a cap is attached to the container opening M, if a gap is to be present between the projecting portion 60 and the skirt wall 54, the locking margin is narrow. The tendency to become Then, when the locking piece 59 gets over the annular projection 58 at the time of opening due to the lack of the locking margin, the opening is completed without breakage of the annular weakened portion 56.

The present invention has been made with the above matters in mind, and the purpose thereof is to widen the locking margin of the locking piece against the annular projection while preventing the locking piece from being reversed, and thus to ensure the opening of the plug. It is an object of the present invention to provide a synthetic resin cap and container which can break the annular weakening portion.

In order to achieve the above object, the synthetic resin cap according to the present invention has a skirt wall provided with an internal thread screwed on an external thread formed on the outer periphery of a container opening, and an annular weakening portion at the lower part of the skirt wall. A cap having a tamper evidence band connected thereto, the locking piece being engageable from below with an annular protrusion provided on the outer periphery of the container opening on the inner peripheral side of the tamper evidence band Are provided at intervals in the circumferential direction, and at least a portion of the plurality of locking pieces forms a pair only with any one of the adjacent locking pieces on both sides, and has a protrusion at the tip thereof The protrusions provided on the locking pieces forming the pair are provided at positions mutually adjacent to the protrusions of the locking pieces of the pair, and provided at the opposite position. In addition, a plurality of the pairs are provided That (claim 1).

In the synthetic resin cap, all the locking pieces may form the pair (claim 2).

In the synthetic resin cap, all the locking pieces except one locking piece may form the pair (claim 3).

On the other hand, in order to achieve the above object, in the container according to the present invention, the synthetic resin cap according to any one of claims 1 to 3 is attached to the mouth (claim 4).

In the present invention, a synthetic resin cap and container capable of widening the locking margin of the locking piece with respect to the annular projection while preventing the locking piece from being reversed and consequently breaking the annular weakened portion reliably in opening the plug. Is obtained.

That is, in the synthetic resin cap of the invention according to each claim of the present application, by disposing the plurality of protrusions in a concentrated manner, a plurality of regions in which the protrusions do not exist can be provided in a concentrated manner. In the vicinity of each area where the protrusion does not exist, the locking margin (area to be locked) of the locking piece with respect to the annular projection can be effectively expanded, and in the state where the cap is attached to the container opening, In this case, the locking piece is prevented from passing over the annular projection, and thus it is possible to reliably prevent the completion of the opening without breaking the annular weakened portion.

Also, from the viewpoint of increasing the locking margin or securing a sufficient locking margin, if the number of protrusions is simply reduced, the fall preventing effect of the locking pieces by the protrusions may be reduced or lost. The synthetic resin caps of the present invention are such that the protrusions of the locking pieces forming a pair are brought close to each other, and the number of protrusions is not necessarily reduced. Can also be prevented.

The synthetic resin cap of the invention according to claim 2 is particularly effective when the number of engagement pieces is even, and the synthetic resin cap of the invention according to claim 3 is the case when the number of engagement pieces is an odd number. Particularly effective.

It is a perspective view showing roughly composition of a synthetic resin cap concerning a 1 embodiment of the present invention. It is a longitudinal cross-sectional view which shows roughly the structure of the container based on one embodiment of this invention with which the said synthetic resin cap was mounted | worn with the opening part. It is a bottom view which shows the structure of the said synthetic resin cap roughly. (A) is an explanatory view schematically showing the positional relationship between the locking piece and the protruding portion of the synthetic resin cap, and (B) to (F) are the positional relationship between the locking piece and the protruding portion according to the modification. Is an explanatory view schematically showing (A) and (B) are explanatory drawing and the principal part enlarged longitudinal cross-sectional view which show roughly the structure of the conventional synthetic resin-made caps.

Embodiments of the present invention will be described below with reference to the drawings.

A synthetic resin cap (hereinafter referred to as a cap) 1 shown in FIGS. 1 to 3 is used by being attached to an opening M (see FIG. 2) of a container such as a plastic bottle, for example. By molding, it is integrally molded with polyethylene. In addition, the raw material which forms the cap 1 is not specifically limited, In addition to the polyethylene used by this embodiment, a polypropylene etc. are used suitably.

In addition, as shown in FIGS. 1 to 3, the cap 1 has a top wall 2 that is substantially circular in a plan view, and a substantially cylindrical skirt wall 3 that extends downward from the outer peripheral portion of the top wall 2. There is. Here, a knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3 and an internal thread 5 is provided on the inner peripheral surface, and the internal thread 5 can be coupled to an external thread M1 formed on the outer periphery of the container opening.

Then, when the cap 1 is rotated and attached to the container opening M so that the female screw 5 of the skirt wall 3 is coupled to the external screw M1 of the container opening M, an annular shape continuously provided on the inner surface (lower surface) of the ceiling wall 2 The middle foot (inner ring) 6, the annular rib 7, and the annular outer foot (outer ring) 8 are in close contact with the container opening M, whereby the container opening M is sealed (see FIG. 2). That is, when the cap 1 is attached to the container opening M, the middle foot 6 is inserted into the container opening M and is in close contact with the inner circumferential surface of the container opening M. The outer foot 8 is configured to be in close contact with the annular upper end surface, and in close contact with the outer peripheral surface of the container opening M. In FIG. 2, although the middle foot 6 and the container opening M are overlapped in order to clearly show the original shape of the middle foot 6, the outer diameter of the middle foot 6 is smaller in the actual wearing state. As a result, it is deformed (diameter-reduced) to contact the inner peripheral surface of the container opening M.

In addition, the cap 1 is a pill fur proof cap having a function of proving unopened (the fact that the opening has never been made), and at the time of opening the unopened cap 1 attached to the container opening M (first When the cap 1 is turned so that the connection between the male screw M1 and the female screw 5 is released at the time of opening the cap, the cap 1 is detached from the container opening M, but the tamper evidence connected to the lower part of the skirt wall 3 A band (hereinafter simply referred to as a "band") 9 is configured to remain at the container opening M.

That is, the band 9 is connected to the lower portion of the skirt wall 3 through the annular weakening portion 10 extending all around the skirt wall 3 (see FIGS. 1 and 2). And a slit that extends intermittently along the circumferential direction of the skirt wall 3 and the band 9 so as to vertically define the belt 9 and the band 9, and a bridge that exists between adjacent slits, Is broken when pulled by a predetermined force.

Further, on the inner peripheral side of the band 9, a plurality (eight in this example) of inwardly projecting locking pieces (flaps) 11 are provided at intervals in the circumferential direction (see FIGS. 1 to 3). ). Each locking piece 11 is positioned substantially below the annular protrusion (bead portion) M2 formed on the outer periphery of the container opening M below the male screw M1 in a state where the cap 1 is attached to the container opening M. And is locked to the annular projection M2 by an opening operation (see FIG. 2). That is, the locking piece 11 is configured to be able to be locked to the annular protrusion M2 from below, and the skirt wall 3 and the top wall 2 above the annular weakening portion 10 detach from the container opening M at the time of opening. The band 9 below the annular weakening portion 10 remains at the container opening M, and the annular weakening portion 10 is broken accordingly.

Here, the band 9 is integrally formed with the skirt wall 3 and the top wall 2, and the locking piece 11 provided on the band 9 protrudes downward when the cap 1 is formed. At the time of mounting, the annular projection M2 is pushed up and turned upside down to project upward as shown in FIGS.

By the way, temporarily, when the locking piece 11 which protrudes upwards falls largely at the time of opening, the locking piece 11 pressed by the annular projection M2 is likely to be in a state of being reversed again and protruding downward, The piece 11 does not engage well with the annular projection M2. So, in this embodiment, as shown in FIG.1 and FIG.3, while providing the protrusion part 12 which protrudes in the tip at the tip of at least one part of the locking piece 11, the tip part of the adjacent locking piece 11 is provided. They are connected by the connecting portion 13 and all the locking pieces 11 are connected in an annular shape.

In this embodiment configured as described above, the fact that the upwardly projecting locking piece 11 is largely fallen (falling) means that the protrusion 12 is in contact with the outer peripheral surface of the container opening M (annular projection M2). (Refer to FIG. 2), whereby the locking of the locking piece 11 with the annular projection M2 is performed well. That is, the protrusion 12 is located on the outer peripheral side of the annular protrusion M2 in a state where the cap 1 is attached to the container opening M.

And in this embodiment, as shown in FIG. 3, the structure which remove | excluded the protrusion part 12 is the same, provides the protrusion part 12 in each locking piece 11 arrange | positioned at equal intervals in the circumferential direction, and each protrusion part 12 Are biased.

More specifically, each locking piece 11 forms a pair only with one of the locking pieces 11 adjacent to each other, and the projection 12 provided on the locking piece 11 forming the pair is a pair of locking pieces It is provided in the mutually adjacent position with the protrusion part 11 of 11, and is not provided in the opposite position. Specifically, in FIG. 3, when a total of eight locking pieces 11 are named as 11A to 11H for convenience, for example, the locking pieces 11B and 11H exist on both sides of the locking piece 11A, but the locking piece 11A is It forms a pair only with the locking piece 11B and does not form a pair with the locking piece 11H. The protruding portions 12 of the locking pieces 11A and 11B are provided at positions adjacent to each other, and the protruding portions 12 are provided at opposite positions (positions separating from each other) in the respective locking pieces 11A and 11B. Not.

That is, the circumferential width of each protrusion 12 is narrower than the circumferential width of each locking piece 11A, 11B. In addition, it is preferable that the width in the circumferential direction of the protruding portion 12 be one fourth or more and two thirds or less of the width in the circumferential direction of the locking piece 11.

Then, in FIG. 3, as a pair similar to the pair of locking pieces 11A and 11B, a pair of locking pieces 11C and 11D, a pair of locking pieces 11E and 11F, and a pair of locking pieces 11G and 11H. And are provided.

When the plurality of protrusions 12 are concentratedly arranged as described above, a plurality of regions in which the protrusions 12 do not exist can be concentratedly provided on the circumference on which each locking piece 11 is positioned, as shown in FIG. As shown in (A), compared with the case where the protrusion 60 is provided on the left and right of each locking piece 59 or the case where one protrusion 12 is provided at the center of each locking piece 11, the region where the protrusions 12 do not exist Can increase the degree of concentration of Along with this, in the vicinity of each region where the protruding portion 12 does not exist, the locking margin (the locking area) of the locking piece 11 with respect to the annular protrusion M2 can be effectively expanded, and the cap 1 is made to the container opening M In the mounted state, when the plug is opened, the locking piece 11 is prevented from going over the annular projection M2, and therefore it is possible to reliably prevent the opening from being completed without breaking the annular weakened portion 10. .

Then, from the viewpoint of securing the locking margin by enlarging the locking margin, the central angle α (see FIG. 3) in plan view of each region where the protrusion 12 does not exist is 30 ° or more, preferably 45 ° or more Preferably, the protrusions 12 are arranged and configured to be as follows. The upper limit of the central angle α may be, for example, 90 ° or less.

In addition, from the viewpoint of increasing the locking margin or securing a sufficient locking margin, if the number of the protrusions 12 is simply reduced, the fall preventing effect of the locking pieces 11 by the protrusions 12 is reduced or lost. In the present embodiment, as described above, the protrusions 12 of the locking pieces 11 forming a pair are brought close to each other, and the number of the protrusions 12 is not necessarily reduced. It is also possible to prevent the prevention effect from being weakened or lost.

The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be modified in various ways without departing from the scope of the present invention. For example, the following modifications can be mentioned.

In the example of FIG. 3, although the locking piece 11 is eight pieces, it does not restrict to this. For example, it is conceivable that the number of the locking pieces 11 is 4 or more and 20 or less.

Further, in the example of FIG. 3, since there are a total of eight locking pieces 11, that is, a plurality of the locking pieces 11, half the number of pairs of the locking pieces 11 can be provided. And the positional relationship of the latching piece 11 and the protrusion part 12 at this time can be simply expressed like FIG. 4 (A). However, when there are a plurality of locking pieces 11 and six or more, it is not necessary to always create half of the pairs, in other words, all the locking pieces 11 are configured to create a pair There is no need, and at least a part of them may form a pair, and for example, a pair less than a half thereof may be created. At this time, the protruding portions 12 may or may not be provided on the locking pieces 11 that do not form a pair, and in the case of providing them, the protruding portions 12 may be provided at the circumferential center of the locking pieces 11 Conceivable.

Specifically, for example, when the number of the locking pieces 11 is eight, as shown in FIG. 4B, it is possible to create three pairs of which the number of pairs is smaller than half (four pairs). In the example of illustration, the protrusion part 12 is not provided in the two locking pieces 11 which do not create a pair.

As another example in the case where the number of the locking pieces 11 is plural, also in the case where the number of the locking pieces 11 is six, as illustrated in FIG. As shown in FIG. 4F, the pair may be two pairs. In the example of FIG. 4 (F), the protrusion part 12 is provided in the two locking pieces 11 which do not create a pair, respectively.

Although not shown, when the number of the locking pieces 11 is four, from the viewpoint of preventing the locking pieces 11 from falling down, the pair of locking pieces 11 (two (four)) make a pair. Is preferred. That is, it is preferable to always provide a plurality of (two or more) pairs.

Also, an odd number of locking pieces 11 may be provided, and in this case, there are always locking pieces 11 which do not form a pair, but in the same manner as in the case where a plurality of locking pieces 11 are provided. In addition, the protrusion 12 may or may not be provided on the locking piece 11 which does not create a pair, and in the case of providing it, it is considered to provide the protrusion 12 in the circumferential direction center of the locking piece 11 Preferably, a plurality of pairs are always provided. Therefore, the number of locking pieces 11 is not three or less.

In the case where the number of the locking pieces 11 is five or seven, as shown in FIGS. 4C and 4D, all the locking pieces 11 except one locking piece 11 form a pair. It is preferable to do. That is, FIG. 4C shows the case where the number of the locking pieces 11 is seven, and FIG. 4D shows the case where the number of the locking pieces 11 is five. Although not shown, when the number of the locking pieces 11 is nine or more, it is not necessary to configure all the locking pieces 11 except one locking piece 11 to form a pair, for example, three locking pieces You may comprise so that all the locking pieces 11 except 11 may form a pair.

Preferably, only one protrusion 12 is provided for one locking piece 11, but a plurality of protrusions may be provided. However, also in this case, as described above, the protrusion 12 is such that the central angle α (see FIG. 3) in plan view of each region where the protrusion 12 does not exist is 30 ° or more, preferably 45 ° or more. It is desirable to arrange and configure the

In the above embodiment, although the two protrusions 12 of the locking pieces 11 forming a pair are separated, the protrusions 12 may be connected to each other.

Needless to say, the above-described modifications may be combined as appropriate.

Reference Signs List 1 cap 2 ceiling wall 3 skirt wall 4 knurled groove 5 female screw 6 middle foot 7 annular rib 8 outer foot 9 tamper evidence band 10 annular weakening portion 11 locking piece 12 protrusion 13 connection portion 52 male thread 53 female thread 54 skirt wall 55 cap body 56 Annular weakening portion 57 Tamper evidence band 58 Annular projection 59 Locking piece 60 Protruding portion M Container opening M1 Male thread M2 Annular projection α Central angle

Claims (4)

1. A cap comprising: a skirt wall provided with an internal thread to be engaged with an external thread formed on an outer periphery of a container mouth; and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion,
   On the inner peripheral side of the tamper evidence band, a plurality of locking pieces that can be locked from below on an annular protrusion provided on the outer periphery of the container opening are provided at intervals in the circumferential direction,
   At least a portion of the plurality of locking pieces forms a pair only with any one of the adjacent locking pieces on both sides, and has a protrusion at its tip,
   The protrusions provided on the locking pieces forming the pair are provided at positions mutually adjacent to the protrusions of the locking pieces of the pair, and are not provided at opposite positions.
   A synthetic resin cap characterized in that a plurality of pairs are provided.
2. The synthetic resin cap according to claim 1, wherein all the locking pieces form the pair.
3. The synthetic resin cap according to claim 1, wherein all the locking pieces except the one locking piece form the pair.
4. A container comprising the synthetic resin cap according to any one of claims 1 to 3 attached to a mouth.
   
   

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