Tamper-evident closures

Abstract

A tamper-evident screw closure (1) is provided and comprises: a head plate (2); a substantially cylindrical skirt (3) having an internal screw thread (4); and a tamper-evident drop band (11), the band being frangibly connected to the lower edge of the skirt. The band comprises a first portion (12) directed downwardly from the cap skirt and a second portion (14) which extends from the lower end of the first portion and which is folded over inwardly and back in the direction of the head plate for engaging behind a securing ring on a container neck. At least one extension (15) is provided in axial extension of the second portion. The extension is provided with one or more notches (18) and the interior of the skirt is provided with one or more corresponding projections (20) which locate in the notches when the second portion is folded. Wherein when the closure is unscrewed the skirt breaks away from the band, and when the skirt is reapplied to the container neck the projections can push on the extension to ensure that the band drops away from the skirt.

Claims

1. A tamper-evident screw closure, the tamper-evident screw closure comprising: a head plate; a substantially cylindrical skirt having an internal screw thread; and a tamper-evident drop band, the tamper-evident drop band being frangibly connected to the lower edge of the substantially cylindrical skirt, the tamper-evident drop band comprising a first portion directed downwardly from the substantially cylindrical skirt and a second portion which extends from a lower end of the first portion and which is folded over inwardly and back in the direction of the head plate for engaging behind a securing ring on a container neck, at least one extension is provided in axial extension of the second portion, wherein the at least one extension is provided with one or more notches and the interior of the substantially cylindrical skirt is provided with one or more corresponding projections which locate in the one or more notches when the second portion is folded, and wherein when the tamper-evident screw closure is unscrewed, the substantially cylindrical skirt breaks away from the tamper-evident drop band, and when the substantially cylindrical skirt is reapplied to the container neck the one or more projections can push on the extension to ensure that the tamper-evident drop band drops away from the substantially cylindrical skirt.

2. The tamper-evident screw closure as claimed in claim 1, in which the or each notch is formed at the free edge of the at least one extension.

3. The tamper-evident screw closure as claimed in claim 1, in which the or each notch is generally quadrilateral in shape.

4. The tamper-evident screw closure as claimed in claim 1, in which the at least one extension comprises one or more flaps.

5. The tamper-evident screw closure as claimed in claim 1, in which the at least one extension comprises a plurality of flaps.

6. The tamper-evident screw closure as claimed in claim 5, in which the plurality of flaps are arcuate and are circumferentially spaced from each other by the one or more notches.

7. The tamper-evident screw closure as claimed in claim 1, in which the one or more projections are in driving engagement with the one or more notches as the tamper-evident screw closure is screwed onto a container neck, whereby to help with co-rotation of the substantially cylindrical skirt and the tamper-evident drop and during application.

8. The tamper-evident screw closure as claimed in claim 1, in which the one or more projections are in driving engagement with the, or at least some of the, one or more notches as the tamper-evident screw closure is unscrewed whereby to assist with breakage of the frangible connection with the tamper-evident drop band.

9. The tamper-evident screw closure as claimed in claim 1, in which the second portion has a generally triangular section.

10. The tamper-evident screw closure as claimed in claim 1, in which the one or more projections are generally square or rectangular.

11. The tamper-evident screw closure as claimed in claim 1 in combination with a container.

12. A tamper-evident screw closure for a container, the tamper-evident screw closure comprising a base or a body attachable to a container neck, the base or the body comprising a sidewall having a substantially cylindrical cap skirt and a tamper-evident drop band, the tamper-evident drop band comprising a first portion directed downwardly, from the substantially cylindrical cap skirt and a second portion which extends from a lower end of the first portion and which is folded over inwardly and back towards the substantially cylindrical cap skirt for engaging behind a securing ring on a container neck, at least one extension is provided in axial extension of the second portion, wherein the at least one extension is provided with one or more notches and the interior of the substantially cylindrical cap skirt is provided with one or more corresponding projections which engage in the one or more notches when the second portion is folded, when the closure is unscrewed the body or the base breaks away from the tamper-evident drop band, and when the substantially cylindrical cap skirt is reapplied to the container neck the one or more corresponding projections can push on the at least one extension to ensure that the tamper-evident drop band drops away from the body or the base.

13. The tamper-evident screw closure as claimed in claim 12, in which the or each notch is formed at the free edge of the at least one extension.

14. The tamper-evident closure as claimed in claim 12, in which the or each notch is generally quadrilateral in shape.

15. The tamper-evident screw closure as claimed in claim 12, in which the at least one extension comprises one or more flaps.

16. The tamper-evident screw closure as claimed in claim 12, in which the at least one extension comprises a plurality of flaps.

17. The tamper-evident screw closure as claimed in claim 16, in which the plurality of flaps are arcuate and are circumferentially spaced from each other by the one or more notches.

18. A flip-top sportscap closure for a container neck, the flip-top sportscap closure comprising a screw-threaded base and a lid joined by a hinge, the screw-threaded base comprising a sidewall at one end of which a tamper-evident drop-hand is frangibly connected, the tamper-evident drop band comprising a first portion directed downwardly from the sidewall and a second portion which extends from a lower end of the first portion and which is folded over inwardly and back in the direction of the lid for engaging behind a securing ring on a container neck, at least one extension is provided in axial extension of the second portion, wherein the at least one extension is provided with one or more notches and the interior of the sidewall is provided with one or more projections which engage in the one or more notches when the second portion is folded, when the flip-top sportscap closure is unscrewed the screw-threaded base breaks away from the tamper-evident drop band, and when the sidewall is reapplied to the container neck the one ore more projections can push on the at least one extension to ensure that the tamper-evident drop band drops away from the screw-threaded base.

19. In combination, a tamper-evident screw closure and a container neck, the tamper-evident screw closure comprising: a head plate; a substantially cylindrical skirt having an internal screw thread, and a tamper-evident drop band, the band being frangibly, connected to a lower edge of the substantially cylindrical skirt, the tamper-evident drop band comprising a first portion directed downwardly from the substantially cylindrical skirt and a second portion which extends from a lower end of the first portion and which is folded over inwardly and back in the direction of the head plate for engaging behind a securing ring on the container neck, at least one extension is provided in axial extension of the second portion, wherein the at least one extension is provided with one or more notches and the interior of the substantially cylindrical skirt is provided with one or more projections which can locate in the one or more notches when the second portion is folded, and wherein when the tamper-evident screw closure is unscrewed the substantially cylindrical skirt breaks away from the tamper-evident drop band, and when the substantially cylindrical skirt is reapplied to the container neck the one or more projections can push on the at least one extension to push the at least one extension off the securing ring and ensure that the tamper-evident drop band drops away from the substantially cylindrical skirt.

20. The combination as claimed in claim 19, in which the one or more projections are arranged to be in driving engagement with the one or more notches as the tamper-evident screw closure is screwed onto the container neck, whereby to help with co-rotation of the substantially cylindrical skirt and the tamper-evident drop band during application.

Description

(1) The present invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:

(2) FIG. 1 is a partial section of a closure formed according to the present invention;

(3) FIG. 2 shows the closure of FIG. 1 fitted onto a container neck;

(4) FIG. 3 is a magnified view of area F in FIG. 2;

(5) FIG. 4 shows the closure of FIG. 2 in the absence of the container neck for explanatory purposes;

(6) FIG. 5 shows the closure/neck of FIG. 2 following first removal of the closure;

(7) FIG. 6 shows the closure of FIG. 5 as it is partially reapplied to the container neck;

(8) FIG. 7 shows the arrangement of FIG. 6 in the absence of the container neck for explanatory purposes;

(9) FIG. 8 shows the closure of FIG. 6 with the closure fully reapplied;

(10) FIG. 9 shows a closure formed according to the present invention and shown fitted onto a container neck and in an unopened condition; and

(11) FIG. 10 is the closure of FIG. 9 following removal and reapplication to the container neck.

(12) The example embodiments are described in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to understand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.

(13) Accordingly, while embodiment can be modified in various ways and take on various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. There is no intent to limit to the particular forms disclosed. On the contrary, all modifications, equivalents, and alternatives falling within the scope of the appended claims should be included. Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate.

(14) Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be interpreted as is customary in the art. It will be further understood that terms in common usage should also be interpreted as is customary in the relevant art and not in an idealized or overly formal sense unless expressly so defined herein.

(15) In the following description, all orientational terms, such as upper, lower, radially and axially, are used in relation to the drawings and should not be interpreted as limiting on the invention.

(16) Referring first to FIG. 1 there is shown a closure generally indicated 1.

(17) The closure 1 comprises a generally circular top plate 2 and a generally cylindrical side skirt 3 which depends from the periphery of the plate 2.

(18) The interior of the skirt 3 has a screw thread formation 4 for engaging a corresponding formation on the exterior of a container neck.

(19) An annular sealing projection 5 depends from the underside of the top plate 2 and in use fits into the bore of the container neck. Additionally an annular sealing bead 6 is provided on the underside of the top plate 2 for sealing against the top of the container neck rim; and a further sealing bead 7 is provided on the interior of a curved shoulder 8 which forms the interface between the side skirt 3 and the top plate 2; the bead 7 seals against the corner of the container neck rim.

(20) At the end of the skirt 3 opposite the top plate 2 an inclined radial step 9 is provided and a terminal skirt portion 10 continues from the step 9. A plurality of bearing projections 20 are provided on the portion 10 and extend slightly into the step 9.

(21) At the lower end of the portion 10 a tamper-evident drop band 11 is provided. A first portion 12 of the band 11 is frangibly attached to the portion 10 by a plurality of frangible bridges 13.

(22) At the lower end of the band first portion 12 a flap-like, generally triangular-section second portion 14 extends. At the end of the second portion 14 an extension 15 extends axially. The extension extends from the inner edge of the portion 14 so that the remainder of the free edge of the portion 14 forms an abutment surface 16.

(23) The extension 15 comprises a plurality of arcuate extension sections 17 punctuated/spaced by notches 18.

(24) In FIG. 1 the closure is shown in an as-moulded condition, with the second portion 14 in a downwardly inclined position extending away from the top plate 2.

(25) FIGS. 2 to 4 show the closure in a working condition, in which the second portion 14 is upturned and folded over inwardly and upwardly towards the top plate 2.

(26) When the closure 1 is applied axially down onto a container neck 50 the second portion 14 can pass over a securing ring 51 to the fully screwed-on position shown in FIGS. 2 and 3. In this position the abutment surface 16 is located under the ring 51 and the extension 15 extends so as to be positioned between the ring 51 and the skirt portion 10. As shown best in FIG. 4, it will also be noted that projections 20 engage into notches 18. The notches are slightly wider than the projections and the projections are arranged to locate at one side of the notches. This means that the projections engage one lateral side of the notches when the closure is being screwed onto a container neck. In this embodiment the notches are generally oblong, with each lateral side being axial/straight (parallel to the skirt); and the corresponding side of the projection is the same so that they are parallel to each other to provide a good abutment. The engagement helps to cause co-rotation of the skirt and the band, which helps to support the frangible bridges (which would normally cause the co-rotation). This relieves stress on the frangible bridges and allows for the bridges to be reduced in thickness/section if desired in certain embodiments, which then makes breakage of the bridges easier in use.

(27) When the closure 1 is unscrewed from the neck 50 for the first time the skirt 3 rotates and moves axially upwards. The abutment surface 16 prevents the band 11 from following and the frangible bridges 13 are broken. It will be noted that because the extension 15 is positioned behind (i.e. juxtapose) the ring 51 this prevents the second portion from being folded down as the closure is unscrewed i.e. this helps to prevent retain the band under the ring. In addition, engagement of the projections of the skirt in the notches band can be used to help to cause breakage of the bridges. The skirt is therefore unscrewed and the band remains on the neck, as shown in FIG. 5.

(28) In some cases the band will drop down when the closure is unscrewed. However, it is also possible that the extension lightly grips the ring after the band is released from the skirt, as shown in FIG. 5.

(29) If the band remains on the ring, then when the skirt is reapplied the projections 20 will come to bear on the extension sections 17, as shown in FIGS. 6 and 7. As the skirt is screwed back down to the fully screwed on position the projections will then push the band away from the skirt and push the extension sections off the ring, so that the band will drop down and, in this embodiment, sit on the neck transfer bead 55, as shown in FIG. 8. This means, therefore, that the band will always drop down (either naturally when the bridges break, or due to the bearing projections).

(30) The circumferential extent of the notches is very small compared to the extent of the flaps, so the chances of the projections re-aligning with the notches when the closure is reapplied is very low.

(31) Referring now to FIGS. 9 and 10 there is shown a flip-top (sportscap) tamper-evident closure 110. The closure 110 includes a lid 115 connected to a base 120 by a hinge 125.

(32) A tamper-evident strip 130 is provided to connect the lid 115 and the base 120 and must be torn off to allow the lid to be opened to reveal a drinking spout.

(33) The base 120 includes a sidewall 121 and at the free end of the sidewall is a tamper-evident drop band 140.

(34) If the band breaks 140 away from the sidewall 121 and then the closure is screwed back down, the sidewall now pushes down on the band flap extension and this pushes the band 40 down, as shown in FIG. 4B to form and maintain a gap to evidence opening of the closure.

(35) By using the closure base to push down on the folded flap part of the drop band this ensures that there is a clear gap between the free end of the sidewall and the broken away drop band.

(36) If the band has already dropped the gap G is maintained; if the band remains on the bead then it is pushed off the bead and down away from the sidewall as the closure is reapplied.

(37) Although illustrative embodiments of the invention have been disclosed in detail herein, with reference to the accompanying drawings, it is understood that the invention is not limited to the precise embodiments shown and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope of the invention.