CLOSURE

Abstract

A tamper-evident closure (1) is provided and comprises a base (10) and a lid (50). The base comprises a sidewall (14) and an outer wall (30a) which is radially outwards of the sidewall. The closure comprises a tamper-evident member (56) which is initially frangibly attached to the lid. Upon first opening of the lid the tamper-evident member is released from the lid and falls between the sidewall and the outer wall.

Claims

1-25. (canceled)

26. A tamper-evident closure comprising a base and a lid, the base comprises a sidewall, the base further comprises one or more outer wall portions which are radially outwards of the sidewall and extend partially around the sidewall, the closure comprises a tamper-evident member which is initially frangibly attached to the lid, in which upon first opening of the lid the tamper-evident member is released from the lid and falls between the sidewall and an outer wall portion, in which the outer wall portion/s extends from the sidewall, with the sidewall and the outer wall portion/s forming a bifurcation, in section, at one end of the base, in which in an initially unopened position at least part of a tamper-evident member is hidden from view by the outer wall portion/s, in which upon first opening at least part of a tamper-evident member becomes visible, and in which the outer wall includes a window in which or through which the member can be seen after first opening.

27. The tamper-evident closure of claim 26, in which the tamper-evident member engages with outer wall to cause release upon first opening.

28. The tamper-evident closure of claim 26, in which the base includes a top deck and the sidewall depends from the periphery thereof.

29. The tamper-evident closure of claim 26, in which the outer wall portion/s are formed as an open valley.

30. The tamper-evident closure of claim 26, in which the sidewall is generally cylindrical and the outer wall portion/s are formed concentrically therewith.

31. The tamper-evident closure of claim 26, in which the closure has two outer wall portions that extend partially around the sidewall.

32. The tamper-evident closure of claim 31, in which the two outer wall portions are diametrically opposite each other.

33. The tamper-evident closure of claim 26, in which only one outer wall portion is provided.

34. The tamper-evident closure of claim 26, in which the base and lid are joined by a hinge so that the lid can move between a closed and an open position.

35. The tamper-evident closure of claim 26, in which the tamper-evident member is formed as a drop tab.

36. The tamper-evident closure of claim 26, in which a plurality of outer wall portions and a plurality of tamper-evident members are provided.

37. The tamper-evident closure of claim 26, in which the closure is formed as a mono-piece.

38. The tamper-evident closure of claim 26, in which the lid includes a hooking arrangement for engaging the base.

39. The tamper-evident closure of claim 37, in which part of the lid is movable to disengage the hooking arrangement.

40. The tamper-evident closure of claim 26, in which the base includes a screw thread formation for engaging a container.

41. The tamper-evident closure of claim 26, in which the base includes a snap bead for engaging a container.

42. The tamper-evident closure of claim 26, in which the base comprises a retaining ring for retaining the closure on a container, the base includes a tether between the retaining ring and the sidewall.

43. The tamper-evident closure of claim 26, in which the sidewall and the outer wall portion/s terminate at approximately the same axial level.

44. The tamper-evident closure of claim 26, in which the base comprises a dispensing spout.

45. The tamper-evident closure of claim 44, in which the spout is eccentrically positioned on the base.

46. The tamper-evident closure of claim 45, in which the base and the lid are connected at a rear of the closure by a hinge and the spout is positioned towards a front of the closure.

47. The tamper-evident closure of claim 44, in which the spout has a height of approximately 8 mm.

48. The tamper-evident closure of claim 26, in which a tamper-evident member is provided at either or both sides of the closure.

49. The tamper-evident closure of claim 26 in combination with a container.

Description

[0047] The present invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:

[0048] FIG. 1A is a perspective view of a closure formed according to an embodiment of the present invention and shown in an unopened condition;

[0049] FIG. 1B is a section of the closure of FIG. 1A;

[0050] FIG. 1C is a side view of the closure of FIG. 1A;

[0051] FIG. 2A is a perspective view of the closure of FIG. 1A shown in an opened position;

[0052] FIG. 2B shows the closure of FIG. 1B in an opened position;

[0053] FIG. 2C shows the closure of FIG. 1C in an opened position;

[0054] FIG. 3A is a magnified sectional view of the closure of FIG. 1A in the region of a tamper-evidencing double wall portion;

[0055] FIG. 3B illustrates the view of FIG. 3A following first opening;

[0056] FIGS. 4A to 4C show sectional, perspective and plan views of the closure in an as-moulded condition;

[0057] FIGS. 5A to 5D show perspective, plan and sectional views of the closure upon first closing and shown attached to a container neck;

[0058] FIGS. 6A and 6B show the closure following opening of the lid;

[0059] FIG. 7 illustrates conformation of the closure lid with safety rules;

[0060] FIGS. 8 to 10 show a closure formed according to a further embodiment;

[0061] FIGS. 11 to 18 show perspective (closed), side (open), plan (closed), side (closed), front (closed), side (closed), section (along line A-A of FIG. 15), and section (along line B-B of FIG. 16) views.

[0062] 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 alternative forms and should not be construed as limited to the examples set forth herein.

[0063] Accordingly, while embodiments 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.

[0064] 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 idealised or overly formal sense unless expressly so defined herein.

[0065] 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.

[0066] Referring first to FIGS. 1 to 7 there is shown a tamper-evident closure generally indicated 1.

[0067] The closure 1 comprises a base 10 and a lid 50 joined by a hinge 5.

[0068] In this embodiment the hinge 5 is a strap that is connected at one end to the lid and at the other end to the base. The strap is wider at its end connecting to the base and narrower at is end connecting to the lid, providing a generally trapezoidal shape (see FIG. 4C, for example).

[0069] The base 10 comprises a generally circular top deck 12 and a generally cylindrical sidewall 14 depending from the periphery of the top deck.

[0070] An annular inner seal 16 depends from the underside of the top deck. An annular outer seal 18 depends from the intersection between the top deck and the sidewall. An annular top seal bead 17 depends from the underside of the top deck between the inner 16 and outer 18 seals.

[0071] A spout 19 upstands from the top deck. In this embodiment the spout is located eccentrically (see FIGS. 4A to 4C, for example) towards a front of the base, opposite the hinge.

[0072] A screw thread formation 20 is provided on the interior surface of the sidewall 14.

[0073] At either side of the base a double wall arrangement is provided. Towards the top deck end of the sidewall a radial wall portion 30a, 30b extends radially outwards to form a gully/valley. Each radial wall portion includes two (in this embodiment) windows 32, 34 separated by a central wall 33. The interior of the wall portions 30a, 30b is provided with an internal retention bead 35.

[0074] The base includes a tethering arrangement at its free end (opposite the top deck).

[0075] The tethering arrangement comprises a ring retaining part 21, two arms 23a, 23b, two film hinges 25a, 25b.

[0076] A plurality of upturned retaining flaps 27 are provided on the interior of the retaining ring and extend radially inwardly and upwardly.

[0077] Each arm 23a, 23b has the shape of an arc of a circle and is connected to the sidewall 186 on the one hand, at the level of one of the film hinges 25a, 25b, and to the ring part 21 on the other hand. Along the upper and lower edge of the arms there are frangible bridges 26.

[0078] Each arm 23a, 23b is connected to the ring part 21 at a location which is angularly distant with respect to the film hinges 25a, 25b to which it is connected, the angle formed by this location and this film hinge being, in the example shown, of the order of 45 to 50 degrees.

[0079] The film hinges 25a, 25b comprise walls of reduced thickness, of generally rectangular shape, connected to the sidewall wall of the cap part on the one hand and to respective arms 23a, 23b on the other hand.

[0080] The flexibility which allows the tilting of the closure cap in use is obtained partly by means of this hinge shape and by the arrangement in the cap part 386.

[0081] A tongue 28 depends axially from the sidewall between the two inclined film hinges 25a, 25b. The hinges 25a, 25b are symmetrical with respect to the median axis of the tongue 28.

[0082] The retaining arrangement is provided so that the closure cannot be completely removed from a container in use.

[0083] In practice, the closure is placed on a container by simple screwing. Normal operation of the closure is as a flip-top dispensing closure by opening and closing the lid. However, if the sidewall is unscrewed the cap part progressively leaves its position which is axially close to the ring 21 until it reaches a position which is axially remote from this ring 21, in which the helical threads of the container and of the cap are out of engagement. The frangible bridges 26 rupture during this movement and the arms 23a, 23b pass from their folded position to the unfolded position shown in by pivoting. The cap may be tilted by virtue of the film hinges 25a, 25b and by rolling and deformation of the tongue 28 against the container neck.

[0084] In this embodiment the tongue 28 has a length such that, during tilting of the cap it bears against the container and exerts, via this bearing, a pulling on the arms 23a, 23b. This pulling is non-existent in the positions of engagement of the cap over the opening of the container and of full release of this cap beyond this opening, but is maximal, the tongue 28 then being flexed, in the intermediate position of the cap between these two positions.

[0085] Other types of tethering arrangement, for example a lasso, are possible.

[0086] The lid 50 comprises a top plate 52 and a depending side skirt 54. A sealing skirt 56 depends from the underside of the top plate. A peak 53 is provided by the lid.

[0087] At the free end of the side skirt 54 a tamper-evident member 56 is frangibly connected via frangible bridges 57. The member 56 includes two tabs 58, 59 separated by a central notch 60. Each tab 58, 59 includes an inclined front face 61 and a hook 62.

[0088] In this embodiment the closure is formed (for example by injection moulding of a plastics material such as polypropylene or polyethylene) with the lid in an open position as shown in FIGS. 4A-4C. Demoulding may be achieved using sliders.

[0089] The lid is initially closed onto the base. In some embodiments an in-mould closing operation is used to close the lid. Closing the lid causes the tamper-evident members to enter into space between the sidewall and the radial wall portions at each side of the closure. The hooks 62 of the tabs 58, 59 are caused to pass under the wall portion retention beads 35see FIG. 3A, for example. The tamper-evident member 56 is not visible in the initially closed position.

[0090] In order to use the closure the lid 50 is lifted using the peak 53. The tab hooks 62 cannot pass back over the beads 35 and this causes the frangible bridges 57 to rupture. The tamper-evident member 56 then drops down further into the space between the sidewall and the radial wall portion until the notch 60 rests on the central wall 33; in doing so the tabs 58, 58 appears in the windows 32, 34see FIG. 3B, for example. This provides visual evidence that the lid has been opened.

[0091] FIGS. 6A and 6B show the closure in an open position, with the tamper-evidence activated. The spout is shown located away from the hinge and this makes it easier to drink directly therefrom.

[0092] The closure conforms with child safety rules EN7I. The lid doesn't fall down into cylinder 31.7 mm (see FIG. 7).

[0093] FIGS. 8 to 10 show a closure 101 formed according to a further embodiment.

[0094] In this embodiment additional hooking is provided at the front of the closure. The lid 150 includes a wall 170 that depends from the lid sidewall 154. The wall 170 terminates with a bead 171. The base 110 includes a corresponding wall III with a bead 113. When the lid is initially closed the beads 171, 113 engage. The lid cannot be opened without first deactivating the hooking provided by the beads. The hooking can be deactivated by pushing the lid sidewall beneath the peak as illustrated in FIG. 10. The hooking can be used to improve/increase sealing and resist unwanted opening of the lid e.g. if the closure is dropped.

[0095] FIGS. 11 to 18 show a closure 201 formed according to a further embodiment and shown attached to container neck 280. The closure 201 is similar to the closure 101.

[0096] 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 as defined by the appended claims and their equivalents.