AU630871B2

AU630871B2 - Containers with tamper evident closures

Info

Publication number: AU630871B2
Application number: AU33632/89A
Authority: AU
Inventors: John Richard Calvert
Original assignee: Reed Packaging Ltd
Current assignee: RPC Containers Ltd
Priority date: 1988-03-15
Filing date: 1989-03-15
Publication date: 1992-11-12
Anticipated expiration: 2009-03-15
Also published as: EP0407441A1; DK220390D0; AU3363289A; ATE123736T1; WO1989008588A1; DE68923084D1; ES2012691A6; EP0407441B1; GB8806133D0; DK220390A

Abstract

A tamper evident band (16) is provided around an area of cooperation between a container mouth (18) and a closure cap (11). Sloping faces (15) and (24) on the container and cap respectively allow the cap, surrounded by the strip (16) to be pushed on to the container, but shoulders (14) and (23) prevent subsequent removal of the cap without first removing the band (16). When the band (16) is removed, the cap can expand radially when pulled upwardly to release the engagement between the shoulders (14) and (23), and so allow removal of the cap. The cap and band (16) may be moulded together from a plastics material, with the band (16) depending from the edge of the cap and being attached thereto by a frangible portion (17, Fig. 1). At some point prior to, or during the assembly with the container, the frangible portion is broken and the band (16) moved to surround the cap as shown.

Description

C OPI DATE 05/10/89 AOJP DATE 02/11/89 APPLN. ID 33632 89 PCT NUMBER PCT/GB89/00275

PCT

INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)

I

(51) International Patent Classification 4 43/06, 45/32 (11) International Publication Number: WO 89/ 08588 Al (43) Int ti Pu tir 1989(21.09.89) 2,Septe er 1989 (21.09.89), (21) International Application Number: PCT/GB89/00275 (22) International Filing Date: (31) Priority Application Number: (32) Priority Date: (33) Priority Country: 15 March 1989(15.03.89) 8806133 15 March 1988 (15.03.88) (71) Applicant (for all designated States except US): REED PACKAGING LIMITED [GB/GB]: New Hvthe House, Aylesford, Maidstone, Kent ME20 7PE (GB).

(72) Inventor; and Inventor/Applicant (for US onlv CALVERT. John, Richard [GB/GB]: 13 Hemnall Street. Epping. Essex

(GB).

(74) Agent: FRANK B. DEHN CO.; Imperial House, 15-19 Kingsway, London WC2B 6UZ (GB).

(81) Designated States: AT (European patent), AU, BE (European patent), CH (European patent), DE (European patent), DK, FI, FR (European patent), GB (Eu-opean patent), IT (European patent), JP, LU (European patent), NL (European patent), NO, SE (European patent), US.

Published With international search report.

Before the expiration of the time limit for amending the claims and to he republished in the event of the receipt of amendments.

YL.- IO.C PATENT OFFICE (54) Title: CONTAINERS WITH TAMPER EVIDENT CLOSURES 2/ 21 0 3 2 4 /3 (57) Abstract A tamper evident band (16) is provided around an area of cooperation between a container mouth (18) and a closure cap Sloping faces (15) and (24) on the container and cap respectively allow the cap, surrounded by the strip (16) to be pushed on to the container, but shoulders (14) and (23) prevent subsequent removal of the cap without first removing the band When the band (16) is removed, the cap can expand radially when pulled upwardly to release the engagement between the shoulders (14) and and so allow removal of the cap. The cap and band (16) may be moulded together from E plastics material, with the band (16) depending from the edge of the cap and being attached thereto by a frangible portion (17, Fig. At some point prior to, or during the assembly with the container, the frangible portion is broken and the band (16) moved to surround the cap as shown.

-1- CONTAINERS WITH TAMPER EVIDENT CLOSURE This invention is concerned with containers and in particular containers with closure systems of the kind which are commonly called "tamper evident" or "pilfer proof".

Tamper evident or pilfer proof closures for containers are known in which a strip or band is provided around a closure member of the container, and has to be removed before the closure member can be removed to give access to the contents of the container. Thus the presence of the undisturbed band is evidence that the container has not previously been opened. Examples of such closures are to be found in EP 0148168 and EP 0280488.

According to a first aspect of the present invention there is provided a container closure assembly having tamper evident means, wherein the tamper evident means includes a removable band which is slidably received on an outer surface of a container or closure member and which circumferentially embraces an area of cooperation between the container closure member and the container which must be radially expanded in order to remove the closure member from the S container, and means for preventing removal of the said band by axial S displacement thereof.

The said band prevents the radial expansion of the said area, which cannot S,:2p therefore take place until the band is removed.

I Preferably, the container, the closure member, and the removable band are I all moulded from plastics material. However, it would be possible for either the container or the closure member to be formed of a more rigid material such as Sglass or metal, so long as one or other of them is so formed as to permit the said radial expansion.

'I

POT/GB 8 9/r 0 7 21 Ma[Y In~ iq la In a preferred arrangement, at the said area of cooperation between the closure member and the container, the closure member and the container JBSTITUTE "S K' 6 b wo 89/08588 PCT/GB89/00275 -2are formed with respective annular shoulders which interengage to prevent axial separating movement of such parts in the absence of said radial expansion.

The closure member may comprise a cap which engages over the mouth of the container, with the band embracing the cap. Alternatively the closure member may comprise a plug which fits in the mouth of the container, with the band embracing the container mouth.

In a preferred embodiment the band is held against axial displacement between two external annular shoulders on the container and the closure member respectively. In such an arrangement, the band may be such that its outer circumferential surface is flush with the outer circumference surfaces of the said shoulders.

The scope of the invention also extends to a closure member alone, for use in the assembly already described. Thus viewed from a second aspect 21) the invention provides a closure member for use in an assembly according to the first aspect of the invention, which closure member is a cap for engagement over a mouth of the container of the assembly, the said cap being moulded from plastics material with a ring of the plastics material for providing the said band extending around and axially away from t 1 edge of the cap and joined thereto by at least one frangible portion, a part of the cap adjacent the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon and the said part of the cap being formed internally with means for cooperating with the container mouth in such manner that the said part of the cap must be radially expanded in order to remove it from the container.

The scope of the invention further extends to a container alone, for use in the assembly already described. Thus viewed from a third aspect the -3invention provides a container for use in an assembly according to the first aspect of the invention, which container has a mouth for receiving a closure member of the assembly in the form of a plug, the container being moulded from plastics material with a ring of the plastics material for providing the said band extending around and axially away from the edge of the container mouth and joined thereto by at least one frangible portion, a part of the container mouth adjacent the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon when said at least one frangible portion is broken and the said part of the container mouth being formed internally with means for cooperating with a said closure plug in such manner that the said mouth must be radially expanded in order to remove the closure plug from the container.

The frangible portion(s) attaching the plastics ring to the closure member or container may be of substantially less thickness than the ring.

The present invention also provides improved methods of making a closure member and a container.

Thus viewed from another aspect the invention provides a method of making a closure member for an assembly according to the first aspect of the o invention, which closure member is a cap having an open end for engagement over a mouth of the container of the assembly, the method including moulding the said cap from plastics material with a ring of the plastics material for providing the said band extending around and axially away from an edge of the cap and joined thereto by at least one frangible portion, a part of the cap adjacent the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon and the said part of the cap being formed internally with means for cooperating with the container mouth in such manriner that the said part of the cap must be radially expanded in order to remove it from the container, detaching the said ring of plastics material from the cap by way of saod at least one frangible portion so as to form the said band and, simultaneously with said detachment, engaging the said band telescopically over the said external circumferential surface of the cap.

z' 1 1-~ r1C -4i! -4- SViewed from yet another aspect the invention provides a method of making a container for an assembly according to the first aspect of the invention, which container has a mouth which is adapted to receive therein a plug constituting the said closure member of the assembly, the method including moulding the said container from plastics material with a ring of the plastics material for providing the said band extending around and axially away from the edge of the mouth of the container and joined thereto by at least one frangible portion, a part of the container mouth adjacent the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon and the said part of the mouth being formed internally with means for cooperating with the closure plug in such manner that the said part of the mouth must be radially expanded in order to remove the closure plug therefrom, detaching the said ring of plastics material from the container mouth by way of said at least one frangible portion so as to form the said band and, simultaneously with said detachment, engaging the said band telescopically over the said external circumferential surface of the container mouth.

The said ring may be broken from the closure member or the container at the end of the moulding operation, before removal from the mould. Alternatively, the ring may be left joined to the closure member or container on removal from the mould and then broken therefrom and moved to engage the said external r i i i ~plll~ 1~6 LA~(" WO 89)08588s PCT/GB89/00275 circumferential surface during the operation of assembling the closure member and the container, or at some intermediate time between the moulding and such assembly.

The following is a description, by way of example only, of an embodiment of a closure member and container in accordance with the invention, reference being made to the accompanying drawings, in which: Figure 1 is a cross-sectional view of part of the closure member as moulded, and Figure 2 is a cross-sectional view of part of the closure member fastened to a container body.

The closure member and the container are moulded from flexible plastics material such as is conventionally used in the container-manufacturing industry.

The closure member comprises a cap having a cylindrical side wall 10 and a recessed top 11. The wall 10 has an outwardly-extending annular flange 12 and an internal annular protrusion 13 with an upper face 14 forming an annular shoulder which extends inwardly at a more acute angle than its lower face 15 extends in an outwards direction.

As shown in Figure 1, moulded integrally with the ;i closure member and depending from the wall 10 thereof !i is an annular strip or band 16, which has an internal Sdiameter slightly greater than the external diameter of the wall 10, so as to be capable of being telescopically engaged thereon. The strip 16 is, as moulded, attached to the wall 10 by a thin, frangible, portion 17.

Figure 2 shows the position of the closure cap and the band 16 when the closure is fastened to a container. The container mouth has a side wall 18 with an upwardly-extending rim 19, the upper part 20 of which is accommodated in an annular recess 21 in the cap. The rim 19 has an external WO 89/08588 PCT/GB89/00275 -6configuration which corresponds partly to the internal configuration of the wall 10 of the cap. In particular, the rim 19 has an external recess 22 with an upper face 23 forming an annular shoulder which is inclined at a similar angle to the shoulder 14 of the protrusion 13 on the cap. The rim 19 has an outer face 24 which tapers inwardly above the face 23. It also has an external peripheral flange 25 beneath the recess 22. As a result of the configurations of the inside of the cap and the outside of the container mouth, the cap can be pressed on to the mouth of the container and retained thereon by the interengagement of the shoulders 14 and 23. The band 16, now detached from the cap and engaged telescopically on the external circumferential surface of the wall of the cap, is located between flanges 12 and and positively prevents removal of the cap from the container, by preventing the radial expansion of the wall 10 of the cap which is necessary to achieve such removal until the band itself is removed.

Specifically, as can be seen in Figure 2, the band 16 prevents the shoulder 14 from moving past the shoulder 23 until the band is removed.

Although not shown in the drawings, it is possible to provide an annular lip extending upwardly from the circumference of flange 25 to overlie the lower part of the band 16. This provides a further degree of tamper prevention, in that it helps to prevent the insertion of an object, such as a knife, between the band 16 and the flange 25 with a view to forcibly prising off the cap.

Thus the band 16 provides tamper evident means whose presence in an undisturbed condition provides evidence that the container has not previously been opened.

The band 16 is provided with release means for breaking it, which may be of any suitable kind, so that the band can be peeled off the cap to enable the cap to be removed from the container. The WO 89/08588 PCT/GB89/00275 -7release means may for example comprise an easily breakable portion of the band, or separable connecting means.

The band 16 may be moved into its position surrounding the cap wall when the cap is being removed from the mould, or it may be moved into such position when the cap is being pressed into position on the container mouth, or at some intermediate time between moulding and pressing on to the container.

Once the band is removed, then the cap may be easily removed from the container. As the cap is pulled upwardly, the protrusion 13 is expanded by the interaction of the shoulders 14 and 23 until the shoulders disengage from one another, at which point the cap may be simply lifted off.

It will be appreciated that while the above embodiment describes the band 16 being formed on the closure member, it could equally well be provided on the container mouth, with the closure member than being in the form of a plug fitting in the container mouth.

It is to be clearly understood that there are no particular features of the foregoing specification, or of any claims appended hereto, which are at present regarded as being essential to the performance of the present invention, and that any one or more of such features or combinations thereof may therefore be included in, added to, omitted from or deleted from any of such claims if and when amended during the prosecution of this application or in the filing or prosecution of any divisional application based thereon. Furthermore the manne: in which any of such features of the specification or claims are described or defined may be amended, broadened or otherwise modified in any manner which falls within the knowledge of a person skilled in the relevant at, for example so as to encompass, either implicitly or explicitly, equivalents or generalisations thereof.

Claims

1. A container closure assembly having tamper evident means, wherein the Stamper evident means includes a removable band which is slidably received on an outer surface of a container or closure member and which circumferentially embraces an area or cooperation between the container closure member and the container which must be radially expanded in order to remove the closure member from the container, and means for preventing removal of the said band by axial displacement thereof.

2. The assembly as claimed in claim 1, wherein the container, the closure member and the removable band are all moulded from plastics material.

3. The assembly as claimed in claim 1 or claim 2 wherein, at said area of cooperation, the closure member and the container are formed with respective annular shoulders which interengage to prevent axial separating movement of such parts in the absence of said radial expansion.

4. The assembly as claimed in any one of claims 1 to 3, wherein said closure member includes a cap which engages over the mouth of the container and the said band embraces the cap.

5. The assembly as claimed in any one of claims 1 to 3, wherein said closure S member includes a plug which fits in the mouth of the container and the said band embraces the container mouth.

6. The assembly as claimed in any one of the preceding claims, wherein said band is held against axial displacement between two external annular shoulders on S the container and the closure member respectively.

7. The assembly as claimed in claim 6, wherein an outer circumferential e 2 surface of the said band is flush with the outer circumference surfaces of the said shoulders.

8. A closure member for use in an assembly as claimed in claim 1, which closure member is a cap having an open end for engagement over a mouth of the container of the assembly, wherein said cap is moulded from plastics material with a ring of the plastics material for providing the said band extending around and dslc en thref -9- axially away from an edge of the open end of said cap and joined thereto by at least one frangible portion, a part of the cap adjacent the said ring has an external circumferential surface arranged to receive the said ring telescopically thereon when said frangible portion is broken, and the said part of the cap is formed internally with means for cooperating with the container mouth in such manner that the said part of the cap must be radially expanded in order to remove it from the container.

9. The closure member as claimed in claim 8 wherein an annular shoulder is formed at the end of said external circumferential surface remote from said edge to prevent axial removal of said ring from the said surface in that direction.

A container for use in an assembly as claimed in claim 1, which container has a mouth for receiving the closure member of the assembly in the form of a plug, wherein the container is moulded from plastics material with a ring of the plastics material for providing the said band extending around and axially away from the edge of the container mouth and joined thereto by at least one frangible portion, a part of the container mouth adjacent the said ring has an external circumferential surface arranged to receive the said ring telescopically thereon when said at least one frangible portion is broken and the said part of the S: container mouth is formed internally with means for cooperating with a said D closure plug in such manner that the said mouth must be radially expanded in order to remove .e closure plug from the container.

11. The container as claimed in claim 10, wherein an annular shoulder is formed at the end of said external circumferential surface remote from said edge to prevent axial removal of said ring from the said surface in that direction.

12. A method of making a closure member for the assembly as claimed in claim 1, which closure member is a cap having an open end for engagement over a mouth of the container of the assembly, said method including moulding the said cap from plastics material with a ring of the plastics material for providing the said band extending around and axially away from an edge of the open end of the -cap and joined thereto by at least one frangible portion, a part of the cap adjacent 10 the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon and the said part of the cap being formed internally with means for cooperating with the container mouth in such manner that the said part of the cap must be radially expanded in order to remove it from the container, detaching the said ring of plastics material from the cap by way of the said at least one frangible portion so as to form the said band and, simultaneously with said detachment, engaging the said band telescopically over the said external circumferential surface of the cap.

13. A method of making a container for an assembly as claimed in claim 1, which container has a mouth which is adapted to receive therein a plug constituting the said closure member of the assembly, said method including moulding the said container from plastics material with a ring of the plastics material for providing the said band extending around and axially away from the edge of the mouth of the container and joined thereto by at least one frangible portion, a part of the container mouth adjacent the said ring having an external circumferential surface arranged to receive the said ring telescopically thereon and the said part of the mouth being formed internally with means for cooperating with the closure plug in such manner the r the said part of the mouth must be radially expanded in order to remove the closure plug therefrom, detaching the said ring of plastics material from the container mouth by way of said at least one frangible portion so as to form the said band and, simultaneously with said detachment, engaging the said band telescopically over the said external i *i:i circumferential surface of the container mouth. i

14. A method of assembling a container closure assembly as claimed in claimn 1, including making a closure member by the method of claim 12, and engaging said closure member over the mouth of the container.

A method of assembling a container closure assembly as claimed in claim 1, including making a container by the method of claim 13 and engaging the closure member in the form of a plug in the mouth of the container.

16. The method as claimed in claim 14 or claim 15, t erein said ring is i, I 1 _1 I 11 H detached from said cap or container respectively and moved to engage the said external circumferential surface prior to the engagement of the closure member in or over the container mouth.

17. A container closure assembly having tamper evident means, substantially as described herein with reference to the accompanying drawings.

18. A closure member as claimed in claim 8, substantially as described herein with reference to the accompanying drawings.

19. A container as claimed in claim 10, substantially as described herein with reference to the accompanying drawings.

20. A method of a closure member for an assembly, as claimed in claim 12, substantially as described herein with reference to the accompanying drawings.

21. A me- -d of making a container for an assembly, as claimed in claim 13, substantially as described herein with reference to the accompanying drawings.

22. A method of assembling a container, as claimed in any one of claims 14 to 16, substantially as described herein with reference to the accompanying drawings. DATED this 28 day of August 1992. REED PACKAGING LIMITED By their Patent Attorneys: CALLINAN LAWRIE S,