JP3338676B2 - Pill fur proof cap made of synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pill fur proof cap made of synthetic resin.

[0002]

2. Description of the Related Art As is well known, a pill fur proof cap made of a synthetic resin is provided with a TE band (tapper evidence band) at a lower end of a screw lid having a downward opening screwed into a bottle mouth through a bridge portion which can be shredded. Connect and T
A locking piece is provided on the inner surface of the E-band so as to be able to come into contact with the flange formed at the bottle mouth from below.

[0003] When the cap is screwed in the packaging process , the locking piece passes through the flange of the bottle mouth by elastic deformation without hindrance. When the screw cap is unscrewed for opening, the locking piece is attached to the flange of the bottle mouth. When the TE band cannot be lifted from below, the bridge is broken and the fact of opening remains.

[0004] This pill fur proof cap has the ease of screwing in that the locking piece of the TE band easily passes through the flange of the bottle mouth during the packaging process, and ensures that the locking piece is securely attached to the flange of the bottle mouth when unscrewed. It is necessary to have a certainty of bridge breakage, in which the bridge is surely cut off by holding, and ease of molding that facilitates die-cutting when manufacturing using a mold. To satisfy these conditions, TE is required.
Numerous proposals have been made for band locking pieces.

For example, Japanese Utility Model Publication No. 57-9240 discloses that a large number of locking pieces formed in a plate shape having a small width are provided at a lower end edge of a TE band at intervals in a circumferential direction. It is described that the locking pieces are formed so as to extend obliquely downward, and each of the locking pieces is bent obliquely upward by screwing the cap into the bottle mouth and locked to the flange of the bottle mouth. I have.

In Japanese Patent Publication No. Hei. 2-0023 and Japanese Patent Laid-Open Publication No. Hei 6-99999, a locking piece is formed so as to extend in a ring shape, and this is integrally connected to the lower edge of the TE band. In this case, it is described that the annular locking piece is formed so as to extend downward or diagonally downward, and then is folded back so as to extend diagonally upward.

Further, Japanese Patent Application Laid-Open No. 7-41023 discloses that
When the locking piece is formed to extend in a ring shape and is extended obliquely upward, and is integrally connected to the lower edge of the TE band, it projects radially inward from the leading edge of the locking piece. It is described that the formed tab is bent.

[0008]

As a mounting form of the locking piece, there is one in which the base of the locking piece extends in the axial direction of the TE band. In this type, the locking piece is viewed in plan. It bends mainly in the radial direction so as to rotate about the base .

[0009] Although the locking piece is bent in the radial direction as described above, although it is easy to mold, it is easily deformed when a vertical force is applied. The phenomenon that the bridge is pulled up with the TE band without breaking the bridge frequently occurs due to the low resistance to tension.

[0010] On the other hand, in each of the above-mentioned prior arts, the connecting portion between the locking piece and the TE band extends in the circumferential direction (horizontal direction), and the locking piece is centered on the base thereof. Since the bottle is rotated up and down, the resistance of the bottle mouth to the flange is large, and therefore, the reliability of the bridge breaking can be improved.

In particular, when the locking piece is formed in an annular shape extending long in the circumferential direction as disclosed in JP-A-6-99999 and JP-A-7-41023, the rigidity of the locking piece is remarkably improved. The striking resistance can be significantly improved,
Further, if a tab is protruded from the locking piece as disclosed in Japanese Patent Application Laid-Open No. 7-41023, it is possible to more securely catch the bottle mouth on the flange.

However, when the locking piece is formed in an annular shape, there is a problem that the screwing resistance when the cap is screwed into the bottle mouth increases. In addition, when the locking piece is formed in a posture extending obliquely upward, there is also a problem that resistance when the die is removed by so-called forcible removal is large, and the durability of the mold is low.

An object of the present invention is to provide a pill fur proof cap which has solved these problems.

[0014]

A pill fur purp of the present invention
As a basic configuration, a screw cap 1 having a downward opening to be screwed into a bottle mouth A formed on the outer periphery of a male screw A1 and a flange A2 vertically separated from each other, and a bridge portion 4 which can be cut at the lower end of the screw cap 1 and a TE van <br/> de 3 connected via the inner peripheral surface or the lower edge of the TE band 3, obliquely upward so as abut from below the flange A2 of the bottle mouth a Are formed in a state in which the locking pieces 7 extend in the circumferential direction in a row.
Die removal after molding is performed by deforming the stopper 7
It is.

Each of the locking pieces 7 is a TE band 3
The base 7a extends in the circumferential direction, and the base 7a
Groove 7c to the site outside of the upward-out or in a state in which the shaft was dearly seen toward a radial direction of the TE-band 3 is opened in the downward
However, it is formed in a state where the interval and the depth decrease from the leading edge 7b toward the base 7a, and flat portions exist on both sides of the concave groove 7c.

In the present invention, it is preferable that each locking piece is formed to have substantially the same thickness dimension as a whole, but the thickness may be different, for example, it may be formed so as to become thicker toward the leading edge.

[0017]

According to the structure of the present invention, the locking piece
The rib effect due Rukoto upward or opening the groove downwards is being formed, because the locking piece is the rigidity against a force from above is remarkably improved, for the flange of the bottle mouth when unscrewing the cap from the bottle mouth Strut resistance can be significantly improved. That is, while the locking pieces are divided into a large number, it is possible to ensure the reliability of the bridge breakage when unscrewing .

Further, since the locking piece is easily deformed when a force is applied from below , when the cap is screwed into the bottle mouth, it is easily deformed so as to overlap with the inner surface of the TE band. Is not impaired.

Furthermore, since a large number of locking pieces are formed in a divided state, when the locking pieces are formed in a state of extending obliquely upward, the locking pieces are formed in an annular shape extending long in the circumferential direction. So-called impossible after molding
It becomes easier to remove the mold by punching , and as a result,
The durability of the mold can be improved.

[0020]

Next, embodiments of the present invention will be described with reference to the drawings.

(1) First Embodiment (FIGS. 1 to 4) FIGS. 1 to 4 show a first embodiment, of which FIG. 1 is partially broken away from a bottle mouth A. Front view, FIG. 2
(A) is a sectional view taken along the line IIA-IIA in FIG.
(B) is B-B sectional view of the partial view (A), FIG. 3 is a front sectional view of a state where screwed to bottle mouth A.

The cap 1 has a screw lid 2 opened downward.
And a TE band (ring portion) 3 located below the screw cover 2 and the TE band 3 are integrally connected to each other by bridges 4 arranged at intervals at appropriate intervals along the circumferential direction. ing.

Although it is needless to explain, an inner screw 5 is formed on the inner peripheral surface of the screw lid 2 to be screwed with the male screw A1 formed in the bottle opening A. Internal thread 5 in the circumferential direction
It is divided so as to be intermittent along . Screw cover 2
The packing 6 is fitted in the upper end portion of the slidably movable state.

In this embodiment, the outer diameter and the inner diameter of the TE band 3 are set to almost the same dimensions as those of the screw cap 2.
On the lower edge of the TE band 3, a large number of locking pieces 7 extending obliquely upward are formed along the circumferential direction so as to be arranged at appropriate intervals.

[0025] Each engaging piece 7, that is set to almost the same thickness as a whole, respectively. Then, as shown clearly in FIG. 2, each locking piece 7, the base 7a is Rutotomoni not extend horizontally along the circumferential direction, the distal edge 7b is TE vans
It is curved in an arc-shaped convex-out downward in a state in which the axis of the de 3 heart had toward the radial direction, Therefore, the locking pieces 7 upwardly
The opened concave groove 7c extends from the leading edge 7b toward the base 7a.
Therefore, the groove width is reduced. Open upward
The mouth groove 7c can be expressed as a downward projection.
You.

On the lower end surface of the TE band 3, there is formed a groove 8 extending annularly in a state of being dug along the base 7a of the locking piece 7. Therefore, the locking piece 7 can be easily deformed downward. It is sufficient that the groove 8 is formed only at a position corresponding to the locking piece 7.

Since the width of each locking piece 7 is small, the base 7a of each locking piece 7 is almost straight in a plan view. Therefore, each locking piece 7 has its base 7a It can be easily bent up and down around the center. In addition, each locking piece 7
In other words, the TE band 3 can be easily deformed into a state in which the TE band 3 is crushed flat.

Since the locking pieces 7 can be easily bent and easily crushed and deformed, the screw cap 2 is screwed into the bottle mouth after the contents are filled in the container in the packaging step. As shown by the dashed line in FIG. 2B, each locking piece 7 abuts on the flange A2 of the bottle mouth A and is easily deformed. Therefore, a situation in which the TE band 3 cannot rotate and the bridge 4 is broken does not occur, and the cap 1 can be securely screwed into the bottle opening A and mounted.

Then, when the cap 1 is unscrewed for opening, the leading edge of each locking piece 7 comes into contact with the flange A2 of the bottle opening A from below, and each locking piece 7 is attached as shown in FIG. As shown by a white arrow B, a force acting to crush the locking piece 7 in a direction opposite to the extending direction of the locking piece 7 acts on the locking piece 7. Because of the rib effect, that is, since the section coefficient of the locking piece 7 with respect to an external force from the direction of the white arrow B increases, each locking piece 7
Are strong against external force from the direction of the white arrow B and are not easily deformed.

For this reason, when the cap 1 is unscrewed and opened, each locking piece 7 securely projects against the flange A2 of the bottle opening A, and the bridge 4 is securely cut.

If the locking piece 7 is merely a flat plate, when the locking piece 7 is lowered below the flange A2 at the bottle opening A by screwing in during capping ,
The locking piece 7 is deformed so as to bend in a direction overlapping with the inner surface of the TE band 3, and the restoration to the original position is insufficient, and the locking piece 7 is not caught on the flange A 2 of the bottle opening A. There is a possibility that it will be sufficient.

On the other hand, in the present invention, the locking piece 7 is
Since the restoring force to return to the original position becomes large even if deformed when screwing in during capping, the flange A2 of the bottle mouth A
Can be surely caught by the locking pieces 7.

Next, an example of an apparatus for forming the above-described cap 1 will be described with reference to FIG. As shown in FIG. 4 sac Chi (A), the molding apparatus, the second to form a first mold 11 for forming the outer surface of the screw cap 2, the inner surface of the cap 1
A mold 12, a third mold 13 for forming the lower surface of the locking piece 7 and the groove 8; a stripper plate 16;
And a fourth mold 14 for forming the second mold.

[0034] The second die 12 has fitted slidably to the third mold 13, the third mold 13 are fitted in the scan tripper plate 16. A projecting pin 17 is slidably fitted in the second mold 12. The first mold 11 to the third mold 13 are movable in the axial direction of the cap 1, and the fourth mold 14 is a split mold that moves in a direction perpendicular to the axial direction of the cap 1. The lower edge of the TE band 3 is supported by the inner peripheral edge of the stripper plate 16.

As shown in ( A), while each of the molds 11... Is advanced, molten resin is injected into the cavity from the gate 18 of the first mold 11. First
Retract the mold 11, the third mold 13, and the fourth mold 14 ( B)
Then, the second mold 12 is retracted with the protruding pin 17 kept in contact with the screw lid 2. Then, the second mold 12 is pulled out of the cap 1 by forcible removal for elastically deforming the screw lid 2 and the locking piece 7.

In this case, since the locking pieces 7 are separated into a large number, the resistance of the die is smaller than that of the case where the locking pieces 7 are annular.
Can be prevented or significantly suppressed, and the durability of the mold can be improved. Further, since the locking piece 7 has a curved cross-sectional shape, the elastic restoring force after the die is released is large,
It is easy to return to the posture extending obliquely upward.

Even if the return deformation of the locking pieces 7 is insufficient due to the deformation at the time of die removal, each locking piece 7 is pushed in the direction of the screw cap 2 when the packing 6 is inserted. At the time of use, the posture can be extended obliquely upward.

In the second mold 12, the inner surface of the screw cap 2 is formed, and the inner surface of the TE band 3 and the upper surface of the locking piece 7 are
(A) may be formed by a fifth mold 15 indicated by a dashed line (in that case, the fifth mold 15 is retracted and then the second mold 12 is formed).
, And the resistance of the die cutting can be reduced).

(2) Other Embodiments (FIGS. 5 to 7) FIGS. 5 to 7 show other embodiments. In the second embodiment shown in FIG. 5, the TE band 3 is arranged outside the screw lid 2 in the radial direction. In this example, the first mold 11 uses T
The outer surface of the E-band 3 is also formed, and the bridge 4 is formed by the second mold 12. In this example, since the split fourth mold 14 as shown in FIG. 4 is not required, there is an advantage that the structure of the molding apparatus can be simplified.

In this example, the tip of the locking piece 7 is hooked at the upper end of the third mold 13, so that the locking piece 7 is moved downward to some extent by the backward movement of the third mold 13. This has the advantage that the die-cutting resistance when the second mold 12 is retracted can be reduced. When the inner peripheral surface of the TE band 3 is formed in a tapered shape whose diameter increases downward,
Die removal resistance can be further reduced.

FIG. 6 shows a third example of another embodiment of the locking piece 7.
1 shows an embodiment. In the example shown in Of this Chi (A),
Flat portions remain on both sides of the concave groove 7c (the downwardly protruding portion) at the distal end edge 7b of the locking piece 7. As indicated by a one-dot chain line in the (A), the provision of the drain hole 19 at the base 7a of the locking piece 7, it is possible to further reduce the resistance during die cutting.

[0042] In the example (B), the forms an upward impact portion 7d (downward grooves) in the locking piece 7, the distal edge 7b is formed to be convex-out upper direction <br/> I have. In this case, the leading edge 7b
Although there remains a flat portion on both sides of butt portion 7d in the entire distal edge 7b may be curved upward facing convex.

In the example shown in FIG. 5C, the leading edge of the locking piece 7 is formed in a downward-pointing chevron, and a concave groove 7c having an upward opening is formed.
(The concave groove 7c may be opened downward).

(3) Others The present invention can be embodied in various ways in addition to the above embodiment. For example, the bridge 4 is not limited to being formed at the time of molding, but may be formed by cutting a peripheral wall of the screw lid 2 with a cutter.

Further, the present invention is to form a screw cap and the TE band separately, Ru can be applied to those integrated by means of fitting or adhesion.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a cap according to a first embodiment.

2A is a sectional view taken along the line IIA-IIA of FIG. 1, and FIG. 2B is a sectional view of FIG.
It is BB sectional drawing.

FIG. 3 is a front sectional view in a state of being screwed into a bottle mouth.

FIG. 4 is a sectional view of a molding apparatus.

FIG. 5 is a partial sectional view of the second embodiment.

FIG. 6 is a diagram showing a third embodiment.

[Explanation of symbols]

A : Bottle mouth A1: Screw thread A2 : Flange 1 :
Cap 2 : Screw cap 3 : TE band 4 : Bridge 7 : Locking piece 7a: Base 7b: Tip edge
7c: concave groove

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 41/34

Claims (1)

(57) [Claims] 1. A screw cap 1 having a downward opening which is screwed into a bottle mouth A having a male screw A1 and a flange A2 formed on an outer periphery thereof and vertically separated from each other, and a bridge portion 4 which can be cut off at the lower end of the screw cap 1. A locking piece 7 extending obliquely upward so as to be able to abut against the flange A2 of the bottle mouth A from below on the inner peripheral surface or lower end edge of the TE band 3. A pill fur proof cap that is formed by forming a large number in a state of being scattered along the circumferential direction, and by performing die cutting after molding by deforming the locking pieces 7; 7, a base 7a to the TE band 3 extends in the circumferential direction, and a portion outside the base 7a has T
Upward looking radially from the axis of E-band 3
Groove 7c or which opens downward come it is root from the distal edge 7b
A pill fur proof cap made of synthetic resin, wherein the pill fur proof cap is formed in a state where the interval and the depth become smaller toward the direction of 7a, and flat portions exist on both sides of the concave groove 7c.