STORAGE CONTAINER

Abstract

A storage container (10) has a storage vessel (12) and a lid (14). The lid has clips (16) for attaching it to the storage vessel. The storage vessel (12) has a separate lip (20) assembled onto an opening flange (72) of the storage vessel. The lip seals with a circumferential member (18) of the lid (14). The lip 20 thus allows the opening flange (72) to form a seal with the lid (14). This provides greater freedom in the manufacturing techniques used for the storage vessel (12) whilst still enabling a seal with the lid (14).There is also a concertina-type vessel described in combination with the lid.

Claims

1. A storage container comprising a storage vessel and a lid, the lid comprising clips for attaching the lid to the storage vessel and a circumferential member for sealing with a lip of the storage vessel, wherein the lip extends around an upper opening of the storage vessel and is assembled onto a rim or flange of the storage vessel such that it seals with and grips onto the upper opening of the storage vessel, the lip comprising at least three separable components, including a retaining ring, a clamp ring and a sealing member, the clamp ring and the sealing member being retained within a groove of the retaining ring when the lip is in its assembled form on the upper opening of the storage vessel, and the sealing member being arranged to cooperate with the circumferential member to provide the seal between the lip and the lid once the lid is attached to the storage vessel.

2. The storage container of claim 1, wherein both the clamp ring and the sealing member grip opposing sides of a flange surrounding the upper opening of the storage vessel.

3. The storage container of claim 1, wherein the sealing member is in direct contact with the flange around the full circumference or perimeter of the opening so as to provide a complete direct seal therewith.

4. The storage container of claim 1, wherein the sealing member is located next to the inside wall of the flange.

5. (canceled)

6. The storage container of claim 1, wherein the retaining ring, the clamp ring and the lid are formed using an injection moulding process.

7. The storage container of claim 1, wherein the lid comprises a groove sized to accommodate the retaining ring therein.

8. The storage container of claim 1, wherein the clips are engaged with the clamp ring to secure the lid to the storage vessel.

9-11. (canceled)

12. The storage container of claim 1, wherein the lid comprises at least one vent.

13. The storage container of claim 12, wherein the vent is operated by a sealing member covering a hole in the lid.

14. The storage container of claim 12, wherein the lid comprises a labelling component associated with, or located in alignment with, the vent.

15. The storage container of claim 14, wherein the labelling component is a label cover or a label member attached to the vent.

16. The storage container of claim 1, wherein the lid has a ridge, flange or elbow for engaging with the sealing member of the lip to form the fluid tight seal between the lid and the storage vessel.

17. The storage container of claim 1, wherein the clips engage with the clamp ring for securing the lid onto the storage vessel, the clamp ring having a single flange onto which all the clips can clip.

18. A storage container having a concertina form thereon, the concertina form defined by a plurality of concertinas, wherein at least some of the concertinas have an overcentre form provided by a non symmetrical shape in section, with one leg being longer than the other in that section, such that said concertinas can individually be clicked down when collapsed and such that when clicked down it is individually self-maintaining in a collapsed state.

19. A storage container according to claim 18, wherein the concertinas extend around the vessel generally parallel to the upper opening or base of the vessel.

20. A storage container according to claim 18 or claim 19, wherein there are between three and fifteen concertinas.

21. (canceled)

22. A storage container according to claim 18, wherein the concertinas allow the storage vessel to be collapsed to a shorter height than its extended, at rest, state to a fully collapsed height of between 30 and 50% of the uncollapsed height.

23. A storage container according to claim 18, wherein the storage vessel is generally round or oval, or curved at its corners.

24. A storage container according to claim 23, wherein the curvature of the outer extremity of the storage container, as viewed in plan, has a minimum radius of not less than 20 mm.

25-26. (cancelled)

27. A storage container according to claim 24, wherein the curvature has a minimum radius of not less than 200% of the amplitude of the corrugations.

28-43. (cancelled)

Description

[0057] These and other features of the present invention will now be described in further detail, purely by way of example, with reference to the accompanying drawings in which:

[0058] FIGS. 1 to 4 respectively show a perspective view, a plan view, a side elevation and a further side elevation showing a collapsed form, of a first embodiment of storage container of the present invention, the embodiment being also known as the mid size box;

[0059] FIG. 5 shows a second embodimenta perspective view thereof, this time it being more rectangular in plan, this embodiment being also known as the lunch box;

[0060] FIG. 6 shows a third embodimentlarger than the first, but still generally square in plan, this embodiment being also known as the cake box;

[0061] FIGS. 7 to 9 show a perspective view, a plan view and a side elevation of the lid of the embodiment of FIG. 5 removed from the storage vesselwith four clips opened out to their co-planar, or moulded condition;

[0062] FIGS. 10 to 12 show a seal and label cover component prior to being applied onto the frame structure of the lid of the previous embodiments, with FIGS. 10 and 11 showing a sealing ring of FIGS. 44 and 45 present thereon and with FIG. 12 showing the sealing ring removed therefrom;

[0063] FIG. 13 shows a section through the storage container of FIG. 5, i.e. the lunch box, with a lid sealed and clipped onto the storage vessel of the storage container, with the concertinas of the storage vessel in their expanded condition;

[0064] FIGS. 14 to 19 show the storage vessel of FIG. 13 prior to fitting a lip thereto;

[0065] FIG. 20 shows a lid for the lunchbox container prior to application of the seal and label cover component, or hinged sealing member, thereto;

[0066] FIG. 21 shows a storage vessel for the cake box embodiment prior to applying a lip thereto;

[0067] FIG. 22 shows a lid for the cake box embodiment prior to applying the seal and label cover component, or hinged sealing member, thereto;

[0068] FIG. 23 shows a storage vessel for the mid-size storage container prior to applying a lip thereto;

[0069] FIG. 24 shows a lid for the mid-size box embodiment prior to applying the seal and label cover component, or hinged sealing member, thereto;

[0070] FIGS. 25 to 27 show partial sections through the storage vessels of the above three embodiments showing details of the preferred corrugations, and the preferred flange detail;

[0071] FIGS. 28 to 30 show a preferred arrangement for the lip for applying to the lunch box embodiment;

[0072] FIGS. 31 and 32 show a preferred arrangement for the lip for the mid size box embodiment;

[0073] FIGS. 33 and 34 show a preferred arrangement for the lip for the cake box embodiment;

[0074] FIGS. 35 to 37 show a preferred arrangement for the retaining ring of the lip of the cake box embodiment;

[0075] FIGS. 38 to 40 show a preferred arrangement for the clamp ring of the lip of the cake box embodiment;

[0076] FIGS. 41 to 43 show a preferred arrangement for the sealing member of the lip of the cake box embodiment;

[0077] FIGS. 44 and 45, as mentioned above, show a preferred arrangement for the sealing ring for the seal and label cover component, or hinged sealing member, of FIG. 10 and FIG. 11;

[0078] FIGS. 46 to 49 show further details of the preferred lid for the cake box embodiment prior to application of the seal and label cover component, or hinged sealing member, thereto;

[0079] FIGS. 50 to 54 show further details and sections through the mid size box embodiment showing how the sealing ring and sealing member engage against opposing members of the lid or storage vessel to ensure a fluid-tight seal; and

[0080] FIG. 55 shows a detail at the base of the mid size box embodiment to permit gripping of the base for facilitating extension of the collapsible storage vessel. Similar detail can be present on any of the box sizes, as illustrated by the base details of FIGS. 14, 21 and 23.

[0081] Referring first of all to FIGS. 1 to 4, a first embodiment of storage container 10 is shown. This storage container 10 comprises a storage vessel 12 and a lid 14 clipped thereon using four clips 16. In the lid 14 there is also a hinged sealing member 38 which will be described in further detail below.

[0082] The storage vessel 12 is an open topped, closed bottomed, generally tubular member that can be sealed generally around the perimeter of the lid by way of an interaction therewith through an applied lip 20. There is thus a circumferential member 18 there around (see FIGS. 13 and 54 for sections through the preferred sealing arrangements).

[0083] The storage vessel 12 in this embodiment has eight concertinas 34 to allow it to be compressible. Different numbers of concertinas can be provided. For example, the embodiment shown in FIG. 5 only has six.

[0084] The storage container 10 has a generally square shape, albeit with rounded corners. Other shapes are also possible including round, oval, triangular and further polygonal shapes or curved shapes. It is preferred, however, that all corners be rounded. FIG. 5 shows one alternative shape, which is rectangular, accompanied again with rounded corners. FIG. 6 shows a further shapeagain square, but this time larger.

[0085] In the first arrangement shown in FIGS. 1 to 4 the outer dimensions of the container are approximately 229 mm wide and approximately 229 mm long with a maximum non- flexed extended height of 125 mm. These sizes, and the ratios between them, are non-essential.

[0086] The term maximum non-flexed extended height is used to mean the height of the container with the concertinas extended but in a condition where internally or externally applied stresses, or non environmental stresses, are removed therefrom, i.e. a free-standing extended condition.

[0087] Upon collapsing the concertinas downwards this height can be substantially reduced. This embodiment compresses to a height of about 44 mm. There is therefore a significant compression achievable by virtue of the concertinas. In this case, the compression is about 35% of the non-stressed height. Other embodiments may alter the angles of the walls of the concertinas (when moulding the vessel) to achieve higher heights initially, and thus greater height compressions. However, the degree of compressibility can preferably be limited to achievable fully compressed heights of between 25 and 60% of the uncompressed, free standing height.

[0088] Referring next to FIG. 5, a second design of storage container is disclosed. It is rectangular, and smaller, with a shorter free standing height. In this embodiment, known as the lunch box embodiment, the rectangle is preferably about 204 mm long and about 154 mm wide, measured to the outsides of the clips 16 (as in the previous embodiment). The height of the container in the unstressed state is preferably about 104 mm. Upon collapsing the corrugations, however, the collapsed height may go down to about 48.9 mm. This is a compression down to 47% of the original height. Other sizes and compressibilities are again permissible through changes to the sizes of the walls and corrugations.

[0089] Referring next to FIG. 6, a third embodiment is disclosed. In this embodiment, the box is larger since it is intended to be a cake box. This may thus be referred to as the cake box embodiment. The previous embodiment was intended to be a lunch box. The first embodiment was intended to be a mid size box. The names and intended uses, however, are non-essential and non limiting as to function.

[0090] The cake box of FIG. 6 is generally square, albeit again with rounded corners. It again has eight concertinas. In this embodiment, the preferred dimensions are about 303 mm wide, about 303 mm long, and about 150 mm high. It is also compressible down to about 53 mm upon compressing the concertinas. This is a 35% height following compression.

[0091] Different numbers of concertinas and different dimensions for the concertinas, sides, heights and lengths are also within the scope of the invention. The three illustrated embodiments are only being provided as examples.

[0092] Referring next to FIGS. 7 to 9, a preferred arrangement for the lid of the lunch box embodiment is shown. In these views, the clips 16 are shown folded out to a non-closed orientationthis may be the orientations they take when the lid is being moulded.

[0093] The clips are hingeably attached to the edges of the lid to allow them to be folded down to clasp the box shut.

[0094] In this embodiment, the hinged clips have two apertures provided within them. These are optional. They could be for engaging over prongs around the edge of the storage vessel for gripping thereon. However, they are in this instance to facilitate the moulding processthey provide access to latches 78, which can fold under a latching rim 76 of the lip, as discussed below.

[0095] When the clips are clipping the lid onto the storage vessel, there is a downward bias for the lid against the vessel so as to ensure the seal therebetween is provided.

[0096] In this embodiment, four clips are provided since that provides a unilateral seal around the full circumference or perimeter of the lip 20. Different shapes of storage container may benefit from fewer or a greater number of clips. For example, if the box is an eight sided box, it may benefit from eight clips, although four clips might still be adequate, whereas if there was a circular box, three clips or even two clips might be adequate, although four is still preferred. If the box was instead a five sided box, then five clips might be provided. Other arrangements will also be apparent to a skilled person. The number of sides does not necessarily dictate the number of clips.

[0097] As can be seen in FIG. 8, the lid 14 has thereon a seal and label cover component or hinged sealing member 38. This hinged sealing member is shown in greater detail in FIGS. 10 and 11 and in a further view thereof as shown in FIG. 12 (in which a sealing ring 48 has been removed). The sealing ring 48 can be seen in situ in FIGS. 10 and 11. Further details of the sealing ring 48 can be seen in FIGS. 44 and 45.

[0098] In this embodiment, the hinged sealing member 38 is for covering over a vent or hole 36 in the lid (see, for example, FIGS. 20, 22 and 24). The vent or hole 36 allows venting of air either into or out of the storage container, e.g. when the lid is clamped onto the storage vessel 12. This allows the collapse or expansion of the concertinas.

[0099] As can be seen in FIG. 10, the seal and label cover component or hinged sealing member comprises three sections. There is a first section which provides for the seal, a second or middle section which is the fixing bar. In this embodiment it has barbed fixing details 46 for attaching it to the structural frame of the lid. There is then a third section which in this embodiment provides a label or label cover member 42. Both the first and the third sections 38, 42 are hingeably attached to the fixing member.

[0100] The label cover is optional but preferred. In this embodiment, it provides an underside space into which a paper label can be inserted for labelling the container. Instead, a surface may be provided onto which writing can be addedpreferred arrangements make this a removable ink receiving surface to allow it to be rubbed off (when using a non-permanent marker).

[0101] There can also be arrangements in which a slot into which paper can be inserted is provided.

[0102] The other endthe end with the sealing ring 48, will now be described in further detail.

[0103] As can be seen in FIGS. 11 and 12, that end has an underside which has a flanged member 50 extending therefrom. That flanged member 50 is sized to accommodate thereover the sealing ring 48. The sealing ring 48 thus has a hole in its centre for fitting over the flanged member 50.

[0104] The sealing ring is made of soft material to allow it to seal against the lid 14. Preferably it is a silicon sealing member, or TPE (thermoplastic elastomer). Preferably it is of a food grade material.

[0105] The sealing ring 48 preferably has a diameter externally of about 14 mm and an internal circular diameter of about 6.6 mm. The size of the hole 36, however, will dictate the size needed for the sealing ring.

[0106] The hinged sealing member (all three parts) preferably has a total length of about 101 mm and a width of about 27 mm. Other sizes are also permitted, or a completely different valve/vent design might be provided, such as those known for other forms of vessel, or on bottles.

[0107] The height of the flanged member 50 for receiving the sealing ring is shown to be about 5.1 mm from the opposing face of the hinged sealing member 38. Other heights are permissible too, depending upon the location or shape of the hole 36, or on the configuration of the hinged sealing member, or the hinge therefor.

[0108] The height of the barbed fixing detail 46 is shown to be about 6.85 mm from the opposing side of the fixing member. Other lengths are permissible, or other forms of attachment may be utilised.

[0109] The barbed fixing details have barbs extending to the sides thereof to facilitate firm securement of the hinged sealing member and label cover to the lid 14. For this purpose, holes are formed in the lid's structure.

[0110] The distal end of the hinged sealing member 38 is shown to be rounded with convex corners 52 and a concave tip 54. The concave tip facilitates grasping the free end of the hinged sealing member 38 with a finger to facilitate lifting thereof for opening of the vent. These are optional details, but are beneficial.

[0111] In the lid 14, underneath the hinged sealing member 38, a depression is provided around the hole 36 that is to be sealed closed by the sealing ring 48. This depressed area 56 is shown to be larger than the hinged sealing member 38, further facilitating the grasping of the hinged sealing member 38 by the user. Again this is an optional detail, but it is beneficial.

[0112] The lid 14 of this embodiment also features a circumferential recess or groove 58 in its upper side. This circumferential recess or groove provides a shoulder 60 for bearing against the upper lip 20 of the storage vessel 12 for providing a seal thereagainst. As can be seen in FIG. 3, the underside of the circumferential recess or groove (its shoulder) has a finger or flange 62 extending therefrom for further improving the seal. This is further shown in FIG. 54 and will be described in more detail later in the description.

[0113] The flange might instead simply descend from the underside of the lid.

[0114] Another arrangement might have and the shoulder descending directly from the underside of the lid, or it might simply be present at the underside, e.g. through a depression or deeper thickness of the mid-part of the lid, i.e. without a circumferential recess or groove 58 in the upper side of the lid.

[0115] Referring next to FIG. 13, a cut away view of a preferred arrangement is shown. This particular view is a cut-away view through the lunchbox embodiment.

[0116] As can be seen, the six concertinas extend around the walls of the vessel 12, those walls ascending upwardly from a base wall 64.

[0117] The base wall in this embodiment has an approximate width of 124 mm and an approximate length of 174 mm. The concertinas of this embodiment thus extend generally outwardly from the base wall 64. Other embodiments might instead have the concertinas extending inwardly therefrom, for example such that the final inward wall 66 of this embodiment is effectively not provided, i.e. the upright 68 of the base 64 instead descends directly from the outermost point 70 of the lowest concertina 34. Other base wall arrangements are also possible, including somewhere between the two (for example like the flange 72 described below), or arrangements where the base is smaller than illustrated, or larger than the concertinas.

[0118] As for the upper end of the storage vessel 12, it defines an upper opening 22, as better seen in FIG. 14. That upper opening 22 is surrounded by the uppermost flange 72, which in this embodiment is a linear flange 72 extending generally vertically, i.e. as a cylinder or hoop with respect to the then horizontal base wall 64.

[0119] The flange or rim 72 of this embodiment is shown further in FIG. 19, and as seen it is located approximately midway with respect to the peaks of the concertinas (actually slightly inward of that mid-way point. This, just like the arrangement at the base, is optional but preferred. In other words, it could be larger or smaller than shown with respect to the concertinas.

[0120] Further, in embodiments without the concertinas, it can still be larger or smaller than that shown.

[0121] This flange or rim is designed to be of a simple form, with minimal complex details, to allow the storage vessel 14 to be blow moulded at low cost. Blow moulding can be a low cost method for manufacturing flexible wall storage vessels, especially those having shapely exteriors with multiple inverting surfaces, such as concertinas. To injection mould such shapes would be very much more complicated as a complex multi-component mould would be involved, which would then make that process less cost effective.

[0122] Preferably the wall thickness for the flange is in the order of 0.5 mm to 1 mm, or preferably about 0.67 mm. It may be thinner or thicker, dependent upon strength requirements of the final product and the blow mouldability of the materials chosen, but these dimensions offer a good compromise on blow mouldability and material cost.

[0123] The preferred material for the vessel 12 is polypropylene (PP). Preferably it is made of a food grade polypropylene.

[0124] The other components of the container may be made using more conventional techniques for storage containers having snap-closable lids, such as injection moulding. By blow moulding this storage vessel, however, significant cost savings in terms of the production cost and material costs might be obtained (compared to injection moulding it).

[0125] Another feature of the concertinas in this embodiment, and of the embodiments of each of FIGS. 1 to 6, is that they have a non-symmetrical shape in local radial section. As can be seen in FIGS. 25, 26 and 27, the lower wall of each concertina is arranged to be shorter than, and at a different angle to the horizontal than, the upper wall of each concertina. In this embodiment the upper wall is at an angle of about 32 degrees to the horizontal whereas the lower wall is at an angle of about 21 degrees to the horizontal. This occurs while still having a generally non tapering series of concertinas along the height of the vessel, so the radial/horizontal component height of both walls is the same (about 13 mm in this embodiment).

[0126] The concertinas stack above each other as well in a repeating mannereach being substantially identical, with the resulting saw-tooth waveform in section having a period length of about 14 mm.

[0127] A similar arrangement is provided in the other two illustrated embodiments too, although the angles and ratios can vary. For example, in FIG. 26 (the mid size box embodiment) the angles are about 28 degrees and about 16 degrees respectively. The radial/horizontal height (i.e. wave-form amplitude height) is instead about 14 mm and the period length is instead about 13 mmi.e. shorter despite being higher. As for the embodiment of FIG. 27 (the cake box embodiment), the angles are about 30 and about 20 with a height (amplitude) of about 16 mm and a length (period) of about 16 mm.

[0128] Different periods, different heights and different angles are also permissible, some ideas for which are presented below. Likewise, the positions of the different lengths may be reversed so that the upper wall is shorter than the lower wall. The illustrated arrangement is preferred, however, so that when the corrugations are collapsed, the top wall as shown (i.e. the longer wall) pushes down the shorter wall into a radially lower position than its hinge point. This enables any food or water contained on the walls of the vessel to drain out of the top of the vessel (when the vessel is inverted), rather than down into the peaks of the concertinas. This better facilitates drip-drying or emptying of the vessel when it is inverted (i.e. the contents are tipped out).

[0129] Further, due to the different lengths of the limbs of the concertinas, the concertinas also perform a further function, namely a click stoppable expansion or contraction of the concertinas such that a user can expand and contract the height of the storage container to pre-defined heights between the shortest and the longest free-standing lengths just by collapsing one or more of the concertinas. This thus functions much like a bendy straw. This arrangement avoids the need for the sealable vent 36 to control the height or length of the container after it has been set by the user (e.g. to evacuate free airspace when the container is only part-filled with foodstuffs).

[0130] Because of this preferred click-down feature of the concertinas, it is also preferred that no sharp circumferential corners are provided around the cylindrical form of the vessel. Sharp corners in radial section are ok, i.e. as per FIGS. 13, 19, 25, 26 and 27, since they make a concertina form, but corners viewable in plan (i.e. FIG. 15) that are preferably avoided. The reason that sharp circumferential corners (i.e. corners of a less than 10 mm radius) are undesirable is that they can stiffen the actuatability of the concertinas, or cause the concertina action to produce undesirable stresses in the corners of the vessel, which can lead to unsightly, non-predefined, surface folding, or busts, in the sidewalls of the vessel. They can particularly cause difficulties with the click stoppable height adjustment feature since the localised stresses arising in such corners when the concertinas are fully folded (as in FIG. 4) could be excessive, which is then likely to result in a failure of the wall of the storage vessel either immediately or at least soon after multiple flexures of the concertinas.

[0131] It is preferred that the minimum radius of such a circumferential corner (viewed in plan) around the circumference of the storage container is 20 mm.

[0132] As shown in the drawings, typically the radius will be larger than that. Compare, for example, with the dimensions discussed below, and elsewhere in this specification.

[0133] As for the angles of the limbs or walls of each concertina, preferably the angle of the shorter wall of each concertina is between 15 and 25 degrees from the horizontal (or from the plane of the base 64), whereas the angle of the longer wall is a larger anglelarger by at least 30% in preferred arrangements, and preferably an angle of between 25 and 40 degrees from the horizontal (or from the plane of the base 64). Note that these angles are defined by the angles of the walls when the vessel is in an at rest or free standing condition, i.e. in the condition they assume when no additional loading is positioned on the walls of the storage container and they are expanded, rather than collapsed.

[0134] Referring back to FIG. 13, and forward to FIG. 54, it can be seen that a lip 20 is fitted onto the uppermost flange or rim 72 of the storage vessel 12. This lip 20 is one of the preferred beneficial features of the present invention. Three embodiments thereof are shown in more detail in FIGS. 28 to 34, one for each storage container embodiment. Further variants will also of course be of note to the skilled person.

[0135] These three embodiments, and variants thereof, are particularly beneficial for providing a good seal at the top of the vessel, and they cooperate well with the design of uppermost flange of the vessels presented in these embodiments, i.e. a vertically arranged flange with a more horizontal support wall 74 connecting it to the uppermost concertina.

[0136] In the illustrated embodiments, the more horizontal support wall is shown to be slightly angled relative to the horizontalan angle of about 10 degrees. Other angles are also able to work with the illustrated lip designs and variants. For example, it could potentially be arranged at an angle of between 0 and 30 degrees from the horizontal in preferred embodiments. The lip's design can also be modified to accommodate steeper angles if preferred.

[0137] Referring to FIGS. 13 and 54, the lip 20 is shown to comprise three components, namely a retaining ring 24, a clamp ring 26 and a sealing member 28. The clamp ring 26 and the sealing member 28 lie either side of the flange 72 and the retaining ring 24 captures all three of these inside a groove provided therein so as to clamp or retain the clamp ring 26 and the sealing member 28 on the opposing sides of the flange 72. This clamping force, and the material of the sealing member, provides a secure and sealing retention of the lip 20 on the uppermost flange or rim 72 of the vessel 12.

[0138] As shown in FIG. 13, the clamp ring 26 can have outwardly extending latching fingers or a latching rim 76 for engaging by the clips 16 for securing the clips in their downward position for securing the lid 14 onto the storage vessel 12.

[0139] Referring now to FIGS. 29 and 30, one arrangement of the retaining ring 24, clamp ring 26 and sealing member 28 for the lunch box embodiment is shown in more detail.

[0140] As can be seen, the latching finger, or rim 76 in this instance, extends all the way around the lip 20, as more clearly seen in FIG. 29. It is provided to be engaged by a latch 78 provided on each clip 16see FIG. 9. These latches 78, as shown in this embodiment, differ from the holes provided in prior art containers such as Lock n Lock RTM products, in that they extend away from the inside or underside if the clips 16 to engage a rim 76 of the lip of the storage vessel, rather than utilising catches extending away from the lip that are encapsulated by holes in the clips, as per the prior art. Prior art arrangements, however, may instead be preferred for some embodiments of the present inventionthe continuous rim 76 is not essential. Likewise it might be preferred to provide providing intermittent latching fingers (not shown) around the lip 20, rather than a continuous rim, for offering compatibility with other lids.

[0141] Regarding the components that make up the lip 20, the details of these will now be further discussed.

[0142] The sealing member 28 of the lip 20 is arranged with multiple faces that have separate functions, albeit all related to creating a reliable seal between the lid 14 and the lip 20 of the storage vessel 12, and between the lip 20 and the storage vessel 12 per se.

[0143] These faces include a first sealing side 80 which engages against the inside surface of the flange 72 of the storage vessel, a lower sealing side 82 which seals against the more horizontal support wall 74 of the storage vessel 12 and an upper sealing side 84 which gets borne against by the finger, flange or shoulder 60, 62 of the circumferential ridge or recess or groove 58 of the lid 14 once the lid 14 is clamped thereon. The sealing member 28 thus provides a very secure seal between the lid 14 and the storage vessel 12, thus making the storage container 10 reliably fluid tight during normal use of the storage container.

[0144] The sealing member 28 also is provided with an annular groove 86, as clearly marked in FIG. 42, which Figure relates to the sealing member design for a cake box embodiment. This groove 86 is a preferred feature to assist in ensuring a good connection and seal with the retaining ring 24.

[0145] As shown in FIG. 41, it is preferred that the sealing member has a generally constant cross section around its full circumference, i.e. no breaks or apertures.

[0146] The sealing member is preferably made of a silicon material, or some other commonly used seal material, such as a (preferably food grade) TPE (thermoplastic elastomer).

[0147] A particularly useful material is one with a Shore A hardness of between 40 and 70.

[0148] As with the other materials used in the various components of the storage container, preferred embodiments have a material and structure that is fully dishwater safe.

[0149] Referring next to FIGS. 35 to 37, further details instead of the retaining ring 24 are shown. Comparing FIGS. 28 and 30 with FIGS. 35 and 36, where two different sections through this retaining ring 24 can be seen, it is apparent from these that the cross-section of this retaining ring is not constant. Instead, it is only generally constantit has intermittent apertures 88 provided there around.

[0150] The apertures facilitate the application of the retaining ringthey allow venting of the air-space presented by its groove.

[0151] In this embodiment, the apertures are tapered, in this case on only one side thereof, so as to have an enlarging width on its outermost end compared to the innermost end. In this embodiment, since the taper is only one sided, the other side thereof is square.

[0152] Referring also to FIG. 32, which shows the corresponding section for the cake box embodiment of FIGS. 35 and 36, it can also be seen that the general section throughout the majority of the circumference of the retaining ring 24 is generally U shaped with two descending legs, the innermost leg being shorter than the outermost leg. The legs might instead be of the same length if preferred.

[0153] Both legs also have a chamfered or tapered or rounded end. These shapes are preferred over a squared off or sharp shape, particularly for the inner leg since it is to be accommodated in the groove 86 of the sealing member 28. By being rounded, preferably corresponding to the shape of the groove 86, the sealing member 28 should not be damaged by the interaction between the retaining ring 24 and the sealing member 28. The other leg can be more square if desired, with fewer consequences, since it would not be bearing against a component made of a more soft material, but nevertheless it is still preferred to be rounded so that it does not damage the component against which it does bearthe clamp ring 26and also so that it does not present a sharp edge to the userit can be the external surface of the lip when the lid is not present.

[0154] That other leg, however, is more preferably designed to face or bear against the latching rim 76 of that clamp ring 26, as shown, so it can have a square endthat squared (or not squared) end may then offer a controlled depth of insertion over the clamp ring and sealing member when the lip 20 is being assembled.

[0155] The aperture 88, which may be tapered as shown, can allow venting of the enclosed space inside the retaining ring 24, and also serve to assist in the moulding of the retaining ringthey allow blades to be inserted through the ring to form the catches 92 as undercutsthese catches 92 are discussed further below.

[0156] The outer leg of the retaining ring 24 also has intermittently spaced around the inside thereof a plurality of catches 92. See FIG. 36. Such catches 92 can be seen to be intermittent in FIG. 35, where they can be seen through the apertures 88. This design is also apparent from looking at the alternative positional section of FIGS. 30, 32 and 34. Other catch forms might instead be used, however, so the apertures might not be present.

[0157] These catches 92 are arranged to coincide with holes 94 provided in upstanding flange 90 that extends around the clamp ring 26. FIG. 40 clearly shows the clamp ring 26 having these holes 94, which holes may be blind holes, but which in this embodiment are arranged to be through holes that extend partway through the upstanding flange and then downwardly out through the bottom of the clamp ring 26, as shown in FIG. 39. These holes 94 interact with the catches 92 to lock the clamp ring 26 inside the retaining ring 24. This then also holds the sealing member 28 in place since it becomes encapsulated through its corresponding upstanding length inside the retaining ringthe length that provides the first sealing side 80 and the groove 86 relative to the inner leg of the retaining ring 24.

[0158] In FIGS. 30, 32 and 34, the gap between the sealing member 28 and the clamp ring 26 is illustrative onlyin practice the lip is assembled onto the rim or flange 72 of the vessel 12. The gap this is of course there to accommodate the flange or rim 72 and the more horizontal support wall 74, as shown in FIG. 13.

[0159] As already discussed, the clamp ring 26 has the rim 76 extending around it, or alternatively latching fingers. It also has a bottom flange or foot 96, which bottom flange 96 is arranged to lie underneath the more horizontal support wall 74 so as to prevent upward removal of the lip 20 from the storage vessel 12.

[0160] In preferred arrangements, the retaining ring 24 is made of a polypropylene, preferably a food grade polypropylene and is also dishwasher safe. Other mouldable materials may instead be used. It is preferred though that it is injection moulded. It is likewise preferred that the sealing member and the clamp ring and the lid are all injection moulded. As before, however, it is preferred that the storage vessel 12 is blow moulded.

[0161] With regard to the retaining ring 24, as can be seen in FIG. 35, it is preferably generally square shaped in plan for the cake box embodiment. It would alternatively be generally rectangular shaped for the lunchbox embodiment and a smaller generally square shape for the mid box embodiment. Typical sizes would include a square of about 218 mm or 293 mm or a rectangle of about 143 mm by 193 mm. Other sizes are of course possible. The sealing member, flange and clamp ring are correspondingly sized too.

[0162] It is preferred that the corners be rounded as shown. This is like the shapes of the corrugations, as mentioned above.

[0163] The radiuses can be variable around the ring. For example, as shown in FIG. 35, the primary parts of the side walls have a large radius or even a straight side. For example the radius might be 380 mm or more, 389 mm or more or 577 mm or more respectively for the lunchbox embodiment, the mid size embodiment and the cake box embodiment. There is then preferably also a tighter radius in the corners, which radius may be 49 mm or more, 58 mm or more or 72 mm or more, again for the lunchbox, mid size and cake box embodiments respectively.

[0164] In preferred arrangements, the radius in the corners is no less than 30 mm or perhaps no less than 20 mm. This provides a pleasant appearance for the product and also facilitates the functioning of the concertina elements where provided. The size of the concertinas are linked to the size of the lip due to their superpositional relationship when viewed in plan in these embodiments. Corresponding size limitations thus can also be applied to the concertinas.

[0165] As for the clamp ring 26, it is also preferably made of polypropylene (PP)preferably a food grade PP. More particularly it is preferably made of the same material as the retaining ring and the lid. It is also preferably injection moulded.

[0166] The sealing member 28 is still preferably made of a softer sealant-suitable material such as thermoplastic elastomers, rubbers or silicones.

[0167] The hinged sealing member and label cover 42, 38 is preferably made of the same material as the retaining ring, for example PP or more preferably a food grade PP. Polypropylene (PP) is particularly useful in this respect since it is slow to fatigue so it is suitable for repetitive usage of the hinged clips - without rapid degradation of the preferred and illustrated moulded hinge joint from fatigue.

[0168] The sealing ring 48 to be applied to the hinged sealing member 38 is most preferably made from the same material as the sealing member 28. The hinged sealing member, however, is preferably made of the same material as the lid.

[0169] The materials are preferably transparent or semi-transparent although they can be opaque or coloured instead if preferred.

[0170] Finally, referring to FIG. 55, a preferred arrangement at the bottom of the storage vessel 12 is provided. As can be seen, in the corners of the storage vessel there is provided a pinchable projection 98 provided by concavities 100 on either side thereof. These concavities are finger graspable to allow pinching of the corners to facilitate expansion of the concertina. This is an optional but preferred arrangement to facilitate use of the concertina function, and can be incorporated into a wide variety of base designs.

[0171] Although dimensions are provided or discussed herein for various elements of the invention, it should of course be appreciated that other sizes and dimensions and component size ratios will also be within the scope of the present invention.

[0172] These and other features of the present invention are described above purely by way of example. Modifications in detail made to the invention within the scope of the claims as appended hereto.