Airtight lid with flip top feature

Abstract: In the closable lid assembly comprising two elements (10, 40) joined together by means of a hinge (30), provision is made for the first element or lid (10) to have a cavity (20) designed to receive the peripheral relief (50) of the second element (40), in the form of a small frame, which has a flat flange (44) designed to delimit the opening (45) of the packaging onto which the assembly is applied. Either or both the flanks of the peripheral relief (50) has or have corrugations (52) which cooperate with a vertical wall of the channel provided in the movable lid element, such corrugations forming an air-­ tight seal between the two elements of the assembly. In order to improve further the airtightness of the closure, a gasket (24) is also provided on the bottom of the cavity (20) and comes into abutment against the relief (5) of the small frame (40).

Description: The present invention relates to a closable airtight lid assembly. The object of the invention is to provide a lid assembly which can be applied to containers having a certain rigidity but easily deformable, containing a product, designed to ensure perfect airtight closure of the product so that it retains its original properties, it being necessary for this lid assembly to be airtight even in the case where the container is deformed. A further object of the invention is that it must also be possible for the lid assembly to be applied to a packaging consisting of a small inner bag or container formed for example by a flexible sheet or film enclosing the product, and by an outer container having a certain rigidity but also easily deformable, inside which said inner container is inserted, the lid assembly being connected to both the containers. A further object of the invention is that it must be possible for the lid assembly to be applied to a packaging consisting of a simple bag of flexible material. Airtight lids for product packaging are known, but they are not suitable for being connected for example to a container which is easily deformable, nor with two different containers. Lids of this type comprise a single element and form a seal with the opening of the container to which they are applied. Such a joining operation has the drawback that, when the container is deformed, the airtightness of the closure is not guaranteed. Moreover, if the wrapper containing the product is inserted inside an outer container, it is difficult to remove the product from the inner container. In both cases, however, it is necessary to separate the lid from the container in order to open the resultant packaging and this involves a certain ncovenience during use. Other currently known lid assemblies which can be opened do not have, on the other hand, a good degree of airtightness on account of the imperfect adhesion between the respective walls of the movable part and of the fixed part joined together, which is sufficient to cause the aforementioned loss of airtightness. For example FR-A-2529865 discloses a lid and frame assembly without an airtight circular seal to maintain freshness of the container content after opening. Also a delimination flange to facilitate initial opening of the container is not mentioned in this disclosure. According to the invention, the closable airtight lid assembly is formed structurally by a movable lid, forming the actual closing part, having along its entire periphery a channel-shaped cavity designed to receive a peripheral relief provided in a second element or small frame, the latter having a peripheral flange directed towards the inside, designed to delimit the opening of the packaging onto which the assembly is applied if necessary, either or both of the flanks of the peripheral relief having corrugations which cooperate with a wall or with both the vertical walls of the channel-shaped cavity provided in the movable lid element so that, when the two elements forming the assembly are brought into pressure-contact with each other, these corrugations, which have a certain flexibility, adhere perfectly to this internal vertical wall of the channel-shaped cavity formed in the lid, providing an airtight seal between the two elements. In order to improve further the airtightness of the closure, a gasket is located on the bottom of the channel-shaped cavity of the lid and comes into operation when the lid is closed, positioning itself above the small frame. In order to avoid accidental opening of the lid, provision is made for the snap-engagement of two bosses located on the contact walls of the lid and the small frame respectively, positioned opposite the hinge. The contour of the front part of the movable lid, opposite the hinge, is slightly curved so that, when this movable element is closed onto the small frame, the two lateral front edges come into contact first with the corresponding front edges of the small frame, thus ensuring preliminary engagement of these edges, followed by proper marrying of the entire contour of the front part of the movable lid onto the small frame. This makes it easy to close the lid by exerting pressure on the middle point of the front part. This arrangement is particularly suitable when the lid has a rectangular shape. The small frame of the lid assembly according to the invention may be coupled either to a container possessing a certain rigidity, but easily deformable, fixing the outer edge thereof, for example by means of adhesive, inside an external peripheral groove in the small frame, or to a wrapper of the flexible type, one of the faces of which is fixed, for example by means of adhesive, to the underlying part of the small frame itself provided with a flat flange delimiting the opening for access to the packaging, or simultaneously to an outer container and an inner container consisting of a flexible wrapper. The invention will now be described with reference to the accompanying drawings which show a non-limiting example of embodiment of the said invention. In the drawings: Figure 1 shows a plan view of the closable lid assembly according to the invention, in the open position; Figure 2 shows a plan view of the closed lid assembly; Figure 3 shows, on a larger scale, along the cross-section III-III of Figure 1, the elements of the lid assembly imagined as being disconnected from each other and located one above the other in an exploded position and, Figure 4 shows a front elevation of the lid assembly with the lid and the small frame slightly removed from one another. In Figure 1, the lid assembly, indicated overall by 2, comprises a first element 10, constituting the lid proper, joined by means of a hinge 30 to a second element 40 constituting a small frame to which the packaging of the product is fixed. The hinge 30 is formed, integrally with the lid 10 and the small frame 40, from the same material from which they are made, by means of weakening of the material itself, for example mouldable plastic of suitable flexibility. The first element 10 of the assembly (see Figures 2 and 3) comprises an upper funnel 12 which forms, in the bottom part, a closed ring-shaped rim 14, the peripheral wall 16 of which delimits, together with the wall 18 of the lid, a channel-shaped cavity 20, the vertices of which are suitably rounded. The small frame 40, having externally the same dimensions as the lid 10, forms an inner cavity 42 having at the bottom a flat flange 44 possessing an opening 45 for access to the packaging, the walls of said cavity 42 rising symmetrically along the entire periphery, with a first lower section 46 which is steeply inclined followed by a section 48 which is slightly inclined relative to the vertical, so as to form a relief 50 which is positioned, when the lid is closed, inside the channel 20 of the lid. The inclination of the connecting surface between the flange and the relief is particularly suitable for the application of the lid onto containers which contain granular products, so as to enable the latter to flow out more easily. On the section 48 of the wall on the inside of the cavity 42 there is arranged a series of corrugations 52 which possess a certain flexibility and cooperate with the internal vertical wall 16 of the channel-shaped cavity 20 creating an airtight seal between the two elements of the lid assembly. These corrugations 52 may also be present on the external peripheral wall 53 of the relief 50. In order to improve further the airtightness of the closure, a gasket 24 is provided on the bottom of the channel 20 surrounding the rim 14 of the lid 10 so as to form a further seal in abutment with the peripheral relief 50 of the small frame 40. Below the flat flange 44 there are provided ribs 56 which promote leakproof fixing with the wall of a container (not shown), for example a bag with a product inside a flexible packaging, obtained for example by means of gluing with suitable adhesives. In the case where the said flexible container is in turn inserted inside a second outer container, this additional container may be fixed by means of gluing in the external peripheral groove 60, formed between the inclined section 46 of the small frame and its external wall 54, and on which the ribs 62 project. In order to avoid accidental opening of the lid part, provision is made for the mutual engagement of bosses 25 and 65 positioned, respectively, opposite the hinge, on the wall 18 of the channel 20 of the lid and on the wall 53 of the small frame while, so that the lid may retain a necessary degree of rigidity in view of the small thicknesses adopted for the lid part, there are provided, by way of example, ribs 22 in the bottom part of the said lid. For the opening of the movable lid 10, there is provided a tongue 26 located externally on the wall of the movable lid, in the region of the boss 25. Finally, particularly in the case where the lid assembly has a rectangular shape, provision is made for the contour of the front part of the movable lid opposite the hinge, comprising the wall 18 and the channel-shaped cavity 20, to be slightly convex in the vicinity of the boss 25 in such a way that, during closure of this movable element onto the frame, the two lateral front edges come into contact first with the corresponding front edges of the small frame thus ensuring preliminary engagement of these edges, followed by proper marrying of the entire contour of the front part of the movable lid onto the small frame. This slight convexity of the front part of the lid comprising said wall 18 and the channel-shaped cavity 20 is indicated by the play or camber 19 in Figures 3 and 4. This curvature, obtained for example by means of hot air, will correspond to a camber of 2-3 mm, after cooling, in the middle part in the region of the boss 25 for holding the lid in the closed position. The closable lid assembly may be made of any material suitable for creating a hinge from the material itself, provided that it is not excessively rigid. By way of example, grade 15 polypropylene has advantageously been used. The assembly may be made in any shape and size and may be applied to containers for any product, made of cardboard, metal, plastic and the like, forming a single whole possessing perfect airtightness, being particularly recommended for products whose organoleptic qualities must be protected, such as for example vacuum-packed coffee, which tends to lose its aroma rapidly once the vacuum packaging has been opened.

Claims: Closable lid assembly comprising two elements formed as a single moulded piece and having the possiblity of being tilted on top of one another owing to the fact that they are joined together by a weakened section which acts as a hinge, the first element or lid (10) has along its entire periphery a channel-shaped cavity (20) designed to receive a peripheral relief (50) provided in the second element (40) in the form of a frame, characterized in that said second element (40) has a peripheral flange (44), directed towards the inside, designed to delimit the opening of the packaging onto which the assembly is applied, and a peripheral channel (60), either or both of the flanks of the peripheral relief (50) having corrugations (52) which cooperate with a wall or with both the vertical walls of the channel-shaped cavity (20) provided in the movable lid element (10), so that, when the two elements are brought into pressure-contact with each other, these corrugations, which have a certain flexibility, adhere perfectly to this or these vertical wall(s) of the channel-shaped cavity (20), formed in the upper lid element, thus providing an airtight seal between the two elements of the lid assembly. Closable lid assembly according to Claim 1, characterized in that the edges of the contour of the channel-shaped cavity (20) of the lid and of the peripheral relief (50) of the small frame (40) are suitably rounded. Closable lid assembly according to Claims 1 and 2, characterized in that in the underlying part of the lid (10) there are provided stiffening means, for example ribs (22). Closable lid assembly according to Claims 1 to 3, characterized in that there are provided two bosses (25, 65) mutually engaging with each other by means of snap-engagement, situated on opposite sides to the hinge (30), respectively towards the inside of the channel-shaped cavity (20) on the peripheral wall (18) of the lid (10) and on the outside of the wall (53) of the peripheral relief (50) of the small frame (40). Closable lid assembly according to Claims 1 to 4, characterized in that, particularly in the case where the lid assembly (10, 40) has a rectangular shape, provision is made for the front part of the movable lid opposite the hinge, comprising the front wall (18) of the lid (10) and the channel-shaped cavity (20), to have a slight convexity with a camber (19) of about 2-3 mm in the middle part, in the region of the boss (25) for holding the lid in the closed position. Closable lid assembly according to Claims 1 to 5, characterized in that, in order to improve further the airtightness of the closure, provision is made for the application of a gasket (24) on the bottom of the channel-shaped cavity (20) of the lid (10), which comes into abutment against the top of the peripheral relief (50) of the small frame (40). Closable lid assembly according to Claims 1 to 6, characterized in that the lower part of the flange (44) forming the bottom of the small frame (40) is fixed, for example by means of adhesive, to the flat upper wall of a packaging consisting of a flexible bag. Closable lid assembly according to Claims 1 to 6, characterized in that the upper edge of the walls of a substantially rigid container is fixed, for example by means of adhesive, inside the said peripheral channel (60) of the small frame 40. Closable lid assembly according to Claims 1 to 6, characterized in that the small frame (40) has fixed to it, for example by means of adhesives, both the flat upper wall of a packaging consisting of a flexible bag, underneath the flange (44), and the upper edge of a substantially rigid container, inside the peripheral channel (60) of the said small frame, said flexible bag being inserted inside the substantially rigid container. Closable lid assembly accordirg to Claims 1 to 6, characterized in that it may be made in any shape and of any material, preferably grade 15 polypropylene. Closable lid assembly according to Claims 1 to 6, characterized in that means designed to facilitate opening of the movable lid, for example a projecting tongue or a cavity, are provided on at least one of the two elements consisting of a movable lid (10) and small frame (40).

Inventors: ALBANESI MARIO, HERTOGS WILLY ALOYSIUS MARIA, KHAN MEHBOOB ADIL, PIERONI LUCIO, ALBANESI, MARIO, HERTOGS, WILLY ALOYSIUS MARIA, KHAN, MEHBOOB ADIL, PIERONI, LUCIO
Applicants: PROCTER & GAMBLE, THE PROCTER & GAMBLE COMPANY
Application year: 1990
Main classification: B65D43
IPC codes: B65D77, B65D43, B65D25