HK1139112B - Tamper-evident closure - Google Patents

Description

The present invention relates generally to a closure for a container and particularly to a closure with means for indicating that a closure has been opened at least once.

There is an increasing demand for tamper-indicating systems which ensure that a container is not re-filled with non-original contents. Whilst it is relatively easy to produce some form of tamper-evidence, it is much more difficult to provide tamper-evidence which cannot be either overcome without causing the tamper-evidence system to activate, or activate and then return to a virtually visually identical state so as to appear non-activated.

A particularly useful method of providing tamper-evidence is to use a system in which a closure is initially located in a first position, but once removed can only be returned to a second position which is visually distinct from the first.

US 5,738,231 describes a closure with a part which is moved during the opening process so that following opening it cannot pass back over projection on a container finish. The result is that the closure can only return to position which is axially displaced with respect to its original position.

WO 02/096771 describes a closure in which two parts are initially adjacent each other and during the opening process the structure of the closure is changed so that a gap is generated between the two parts as a visual indication that the closure has been opened at least once.

WO 2005/049443 and WO 2006/117505 also describe closures which generate a gap to indicate they have been opened at least once. In this case the gap is unobstructed. In other words, two parts of the closure are held apart without the requirement an obstruction.

The preamble of claim 1 is based on WO 2006/117505 .

Such tamper-evident systems are only effective if they cannot be reversed. For example, in systems which use an obstructing member to hold two parts apart it is possible to cut the obstruction member to allow a gap to be closed. WO 2005/049443 and WO 2006/117505 describe closures which generate unobstructed gaps following relative rotation of one part with respect to another. The closures are provided with some internal mechanism for preventing the two parts from being rotated back to their original relative positions. For example, ratchet arrangements present on the side walls of the parts can be used to prevent unwanted rotation. Such "lateral" ratchet arrangements have been found to be defeatable if sufficient reverse turning torque is applied.

There is a need for an increased level of resistance to re-setting such gap-generating closures to reduce the risk that the gap can be re-closed after first opening.

According to the present invention there is provided a tamper-evident closure according to claim 1.

In the embodiment of claim 1 both the inner and outer parts have respective top plates which include corresponding ratchet parts that engage to prevent relative rotation of the parts. This type of ratchet arrangement may be referred to as a longitudinal ratchet arrangement, as opposed to known lateral arrangements which are positioned on side walls.

The second portion may be adapted to be connected to a container and the first portion may comprise a cap. Certain industries demand closures with a first portion comprising a cap and a second portion comprising a sleeve which is connected to a container; for example the spirits industry.

The closure may further comprise a fitment such as a non-return fitment. Alternatively the first portion may be adapted to engage a fitment associated with the container. Certain industries, in particular the spirits industry, demand additional measures to prevent tampering. In-bore fitments, such as non-return fitments, are often fitted to containers to prevent re-filling regardless of other tamper-proofing measures.

The closure may include means for preventing the inner part from moving relative to the second portion until it has reached the second position.

The gap may be unobstructed. This means that the closure would not have to rely on an obstructing member becoming trapped. By forming an unobstructed gap it is not possible to defeat the tamper-evidence by a simple cutting operation. The gap may be formed at the respective adjacent peripheries of the portions. The inner part may include a section which extends beyond the outer part towards the second portion in the second position; the part may be positioned so as to be visible through the gap.

The second portion may be permanently fixed in its position on the container. This can be used to prevent the second portion from being moved to close the gap. The first portion may further includes a lateral ratchet arrangement for locking the inner and outer parts in the second position. This provides increased resistance to re-setting.

The first portion may include engagement formations and the lateral ratchet arrangement is located above the formations. The first portion may include formations, such as screw threads, for engaging the container or in-bore fitment. In such cases the ratchet arrangement or other locking mechanism may be located above the formations so as to increase the difficulty in accessing and tampering with the locking arrangement.

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

• Figure 1 is a section of a closure formed according to the present invention in a first, unopened position;
• Figure 2 is a section of the closure of Figure 1 shown in a second, opened position;
• Figure 3 is a side elevation of the opened closure shown in Figure 2;
• Figure 4A is a perspective view of a second portion of the closure;
• Figure 4B is an underside perspective view of the second portion shown in Figure 4A;
• Figure 5A is a perspective view of a first portion inner part of the closure;
• Figure 5B is an underside perspective view of the inner part of Figure 5a;
• Figure 5C is a plan view of the inner part shown in Figure 5A;
• Figure 6A is an underside perspective view of a first portion outer part of the closure;
• Figure 6B is an under planned view of the outer part of Figure 6A;
• Figure 7A is a perspective view of a valve housing forming part of the closure;
• Figure 7B is a further perspective view of the valve housing of Figure 7A;
• Figure 8A is a perspective view of a valve member forming part of the closure;
• Figure 8B is a further perspective view of the valve member of Figure 8A;
• Figure 9 is a side elevation of a closure formed according to an alternative embodiment;
• Figure 10 is a section of the closure shown in Figure 9;
• Figure 11 is a perspective view of the closure of Figures 9 and 10 shown in an open position;
• Figure 12 is a side elevation of the closure of Figure 11;
• Figure 13 is a section of the closure shown in Figure 12;
• Figure 14 is a section of the closure shown in Figures 9 to 13 shown in a closed position following an initial irreversible opening event;
• Figure 15 is a side elevation of a closure formed according to an alternative embodiment and shown in an open position;
• Figure 16 is a perspective view of the closure shown in Figure 15;
• Figure 17 is a section of the closure shown in Figures 15 and 16;
• Figure 18 is a section of the closure shown in Figures 15 to 17 shown in a closed position following an initial irreversible opening even
• Figure 19 is a perspective view of part of a closure body forming part of the closure shown in Figures 15 to 18 illustrating connection of an inner part terminal end portion;
• Figure 20 is a perspective view of the closure body shown in Figure 20; and
• Figure 21 is a plan view of the closure body/end portion shown in Figure 19.

Referring first to Figure 1 there is shown a closure generally indicated 10 secured onto a container neck 15.

The closure 10 comprises a main body 20, an inner part 25 and an outer part 30. A metal shell 35 forms an outer casing to the closure and is divided into a cylindrical lower part 36 and a cup-shape second part 37. The parts 36, 37 are separated at a split line 40 formed by a cutting process once the shell 35 has been applied to the first and second portions of the closure.

Together the body 20 and the shell part 36 comprise a second portion and the inner and outer parts plus the shell part 37 comprises a cap-like first portion.

The main body 20 is fixed onto the container neck 15 by clips 45 which project inwardly and engage under a shoulder 50.

A valve housing 55 is clipped into the main body 20 and includes a sealing lip 57 which seals against the top surface 16 of the container neck 15.

A float valve 65 is housed in the housing 55 and can seal against a valve seat 60 to prevent re-filling of the container. A valve control ball 70 is located on top of the float valve 65.

In use, the second part 37 of the shell 35 is rotated. This unscrews the outer part 30 from the inner part 25. The outer part unscrews until a locking mechanism described in more detail below locks it to the inner part 25. With the outer and inner parts locked together the inner part 25 can then be unscrewed from the main body 20.

When the cap (shell part 37/outer part 30/inner part 25) is screwed back onto the main body 20, a gap G is formed between the first and second shell parts 36, 37.

This is because the outer part 30 cannot be screwed completely back down onto the inner part 25 by virtue of the locking mechanism. In addition, the bottom of the inner part 25 protrudes below the bottom of the outer part 30 so as to be visible in the gap G.

The gap G formed between the shell parts 36, 37 is unobstructed in the sense that there is no obstruction member trapped between the parts 36, 37.

Referring now to Figures 4A and 4B the main body 20 is shown in more detail.

The body 20 comprises a lower engagement portion 21 and an upper flow regulation portion 22.

The lower portion 21 comprises a generally cylindrical body having two diametrically opposed windows 21a each of which has at a lower edge a ledge 45 for engagement under the container neck shoulder 50 as shown in Figures 1 and 2. In addition, the interior surface of the lower portion 21 a has a plurality of mutually spaced axial ribs 21 b which lock onto the outer surface of the container neck in use to prevent relative rotation between the container neck and the body 20.

The upper portion 22 of the main body 20 is generally frusto-conical in shape and has external screw threads 22a. At the base of the portion 22 where it joins the portion 21, two sets of ratchet teeth 23 are positioned. The teeth 23 engage corresponding teeth on the inner part 25 to prevent it from rotating whilst the outer part 30 is being rotated for the first time in use. Only after the outer part 30 has locked against the inner part 25 can the inner part 25 be rotated relative to the body 20. At the opposite end of the portion 22 a dome-shape flow regulator 22b is positioned in the aperture. The aperture itself is defined by a circumferential pouring lip 22c.

Referring now to Figures 5A to 5C the inner part 25 is shown in more detail.

The inner part 25 is generally cup-shape with a cylindrical side wall 25a closed at one end by a top plate 25b.

The interior surface of the open end of the sidewall 25a includes a continuous series of ratchet teeth 25b which engage the ratchets 23 on the main body portion 22.

The exterior of the sidewall 25a includes two inclined.side ramps 26. At the start of each ramp 26 is a locking step 26a the purpose of which will be described in more detail below.

The sidewall 25a also comprises a pair of ratchet members 27a, 27b adjacent the top plate 25b.

The exterior surface of the sidewall 25a also comprises a circumferential bead 25c the purpose of which will be described in more detail below.

The top plate 25b comprises a pair of opposing arcuate ramps 28a, 28b each of which terminates with a locking recess 29a, 29b.

Referring now to Figures 6A and 6B the outer part 30 is shown in more detail.

The part 30 is generally cup-shape and comprises a cylindrical side wall 30a and a top plate 30b.

The exterior of the part 30 comprises a plurality of knurls 30c which help to lock the shell part 37 and to prevent relative rotation.

The interior of the sidewall 30a comprises a circumferential bead 31 for preventing the outer part 30 being lifted off the inner part by engagement with the corresponding bead 25c.

The interior of the sidewall 30a also comprises a pair of drive dogs 32 which engage in the ramps 26 of the inner part 25 and ride up them as the outer part 30 is rotated relative to the inner part 25.

The interior of the side wall 38 also comprises a pair of diametrically opposed ratchet arrangements 33a, 33b designed and positioned to run over and lock onto the corresponding ratchet arrangements 27a, 27b on the inner part 25 to prevent counter rotation.

The underside of the top plate 30b includes a pair of drive dogs 34a, 34b each of which comprises a main body 38a, 38b and a locking tooth 39a, 39b.

Referring now to Figures 7A and 7B a valve housing 55 is shown in more detail.

The housing 55 comprises a generally cylindrical body having a circumferential sealing flange 56 with a depending sealing lip 57 (sometimes referred to as a "crabs claw").

The exterior of the housing includes two circumferential beads 61,62 which are used to clip the housing into the body 20 (as shown in Figure 1).

The interior of the housing 55 comprises a valve chamber 58 having four locating ribs 59 and a valve seat 60.

Referring now to Figures 8A and 8B a float valve 65 is shown in more detail.

The valve 65 comprises a generally cup-shape body comprising a cylindrical side wall 66 and a recessed top plate 67.

The operation of the closure will now be described in more detail.

Initially the body 20 is locked on to the neck 15 be the ribs 21 b to prevent axial and rotational movement. The inner part 25 cannot rotate relative to the body 20 by virtue of the ratchets 23, 25b. The shell part 37 cannot rotate relative to the outer part by virtue of the knurls 30c. The outer part 30 cannot be lifted off the inner part 25 by virtue of the locking beads 25c, 31 and by virtue of the drive dogs 32 engaging under the steps 26a

The shell part 37 is grasped by a user and turned. This causes the outer part 30 to rotate relative to the inner part 25. The drive dogs 32 in the outer part rise up the ramps 26 in the inner part and the drive dogs 34a rise up the ramps 28a, 29a. The ratchets 33a pass over the ratchets 27a, 27b.

The outer part is caused to rise by 2mm. At this point continued rotation causes the locking teeth 39a, 39b to drop into the locking recesses 29a, 29b. In addition, the ratchets 33a have rotated beyond the ratchets 27a, 27b. The inner part drops back down by 0.5mm.

Continued rotation of the outer part relative to the inner part is not possible because the drive dogs 32 abut against the end of the ramps 26 and the drive dogs 34a, 34b abut against the end of the ramps 28a, 28b.

In this second position the open end of the outer part 30 has moved axially away from the open end of the inner part 25 to expose the free end of the sidewall 25a.

Continued rotation of the cap part (the shell part 37, the outer part 30 and in the inner part 25) overcomes the torque required to allow the ratchets 25 to pass over the ratchets 23 which causes the inner part to rotate relative to the body. The internal screw threads 25d on the inner part rise up the external screw threads 22a of the body.

The cap part can now be lifted off the body 20 to allow the contents of the container to be dispensed.

The contents are dispensed through the valve housing 55. The valve 65 lifts off the seat 60 as the container is upturned and contents flow out. The valve 65 re-seals against the seat 60 under the weight of the ball 70 when the container is returned to an upright position. This prevents re-filling of the container.

When the cap part is returned the inner part 25 is screwed back onto the body 20. The inner part screws back down to its original position, but the outer part cannot because it is locked in position both by the axial locking means provided by the drive dogs 34a, 34b and the lateral locking means provided by the ratchets 33a, 33b and 27a, 27b. This means that the gap G is formed between the shell parts 36, 37 with free end of the inner part skirt visible through it. This irreversible opening event provides visual evidence that the closure has been opened at least once. The gap G cannot be closed without destroying the closure.

Because the gap G between the metal shell parts 36, 37 is not generated by placing an obstruction directly between them, it is not possible to close the gap G by a simple cutting operation.

By providing the dual axial and lateral ratchet arrangements, re-setting closure back to its original position to close the gap G is prevented. In an alternative embodiment (not shown) a similar closure is provided with just an axial ratchet arrangement.

Referring now to Figures 9 and 10 there is shown a closure 110 formed according to an alternative embodiment. The closure 110 is similar to the closure 10 illustrated in Figures 1 to 8.

In this embodiment the upper and lower shell parts 136, 137 are initially joined by a plurality of frangible bridges 180 which will break if either: i) the lower shell part 136 is rotated before initial opening; or ii) an attempt is made to pull the top part of the closure off without unscrewing. The bridges therefore serve as an additional tamper-evident feature.

As seen best in Figure 10, the inner part 125 of the closure extends beyond the split line 140 and the open end of the outer part to provide a dog-leg shape terminal portion 190 which rests on a shoulder 120a on the main body 120 so that one half 192 of the terminal portion fits beneath the upper end of the lower shell part 136 and the other half 194 fits in the upper shell part 137. Above the shell split line 140 a plurality of frangible bridges (not shown) are formed in the inner part 125 to form a split line 185.

Referring now to Figures 11 to 13, in use, when the closure is opened the shell part 137 is unscrewed in the same way as that described for the closure 10. In this embodiment, however, the unscrewing action breaks both the bridges 180 on the split line 140 and those on the split line 185. The result is that the terminal portion 190 of the inner part remains held on the body so that the half 194 produces a visible upstanding band. When to top cap is replaced, as shown in Figure 14, the band 194 is visible through the gap G.

Figures 15 to 21 show a closure 210 formed according to an alternative embodiment. The closure is very similar to the closure 110 and includes and extended inner part 225 which has a dog-leg shape terminal portion 290. In this embodiment a split line 285 is formed approximately in line with the split line 240 between the shell parts. The result is that in use instead of a band being retained on the lower part of the closure, the upper half 294 of the terminal portion 290 is removed with the top cap on first opening and projects below the open end of the cap so as to be clearly visible. When the closure is then returned to the closure position (Figure 18) the portion half 294 is visible in the gap G.

As shown best in Figures 19 to 21, the terminal portion half 292 sits on the body shoulder 220a. The body wall extending from the shoulder 220a carries a plurality of ratchet teeth 295 for engaging a plurality of corresponding teeth 296 formed on the interior surface of the half 292. This prevents the half rotating relative to the body 220 in use and ensures breakage of the bridges formed along the split line 285. A similar arrangement is provided for the closure 110.

Claims (13)

1. A tamper-evident closure (10) for a container, the closure comprising:

   - a first portion including inner (25) and outer (30) parts

   - a second portion (20)

   the outer part (30) is movable relative to the inner part (25) a first position in which at least part of the first and second portions are adjacent each other to a second position in which there is a gap (G) therebetween, the first portion (25, 30) comprises locking means for irreversibly locking the closure in the second position upon first opening so that the gap cannot be closed, characterised in that the outer part (30) and inner part (25) comprise top plates (25b), 30b) that comprise a longitudinal ratchet arrangement (28a, 28b, 29a, 29b, 34a, 34b) between them.
2. A tamper-evident closure as claimed in claim 1, in which the second portion is adapted to be connected to a container and the first portion comprises a cap.
3. A tamper-evident closure as claimed in any preceding claim, in which the closure further comprises a non-return fitment.
4. A closure according to any of Claims 1 to 2, in which the first portion is adapted to engage an in-bore fitment associated with the container.
5. A tamper-evident closure as claimed in any preceding claim, in which the closure includes means for preventing the inner part from moving relative to the second portion until it has reached the second position.
6. A tamper-evident closure as claimed in any preceding claim, in which the gap (G) is unobstructed.
7. A closure according to any preceding claim, in which the second portion is permanently fixed in its position on the container.
8. A closure according to any preceding claim, in which the first portion further includes a lateral ratchet arrangement (33a, 33b, 27a, 27b) for locking the inner and outer parts in the second position.
9. A closure according to Claim 8, in which the first portion includes engagement formations and the ratchet arrangement is located above the formations.
10. A closure according to any preceding claim, in which the gap is formed at the respective adjacent peripheries of the portions.
11. A closure according to any preceding claim, in which the inner part includes a part which extends beyond the outer part towards the second portion in the second position, the part is positioned so as to be visible through the gap.
12. A closure as claimed in any preceding claim, in which the closure includes a metal shell (35).
13. A closure as claimed in Claim 12, in which the shell is associated with the first and second portions and in which the gap is formed within the shell.