LID FOR RECIPIENTS

Abstract: A lid (1) suitable for engaging, in a removable manner, the mouth of a recipient comprises a surface (5) delimited by an edge (6) suitable for contacting the walls (3) of the recipient in correspondence with the mouth to create a tight seal. Advantageously, the surface (5) of the lid (1) can yield elastically and the lid (1) comprises valve means (9) which permit the passage of air through its surface during the operation of engaging the lid (1) with the mouth of the recipient, permitting the evacuation of the air contained in the recipient.

Description: LID FOR RECIPIENTS DESCRIPTION This invention refers to a lid for recipients which is destined to engage, in a removable manner, the mouth identified by the walls of a recipient such as, for example, a container for food, a saucepan and similar. The lid comprises a surface delimited by an edge suitable for contacting the walls of the recipient in correspondence with the mouth of the same so that the lid closes tightly on the recipient . The use of recipients on which lids of the type described above are applied for the preservation of food is known. The aforethe said recipients are particularly indicated for the domestic preservation of both raw and cooked foods, that is to say, for preserving the foods for a few days, especially in refrigerators. The requirement which must be met to obtain good preservation of food is to avoid contact of the same as much as possible with the outside environment so as to prevent possible contamination. The need to use lids which create a tight seal with the recipient derives from this. At present, recipients suitable for meeting the aforethe said need are already supplied in combination with a lid specially designed and shaped to engage tightly with the mouth of the recipient. In substance, each lid is able to ensure the tight closure of the container for which it was designed. The problem that food cannot be kept in the same saucepan it was cooked in can be immediately seen from the above, as saucepan lids generally do not provide a tight seal. As a consequence, the food to be preserved must be put into one of the afore the said containers . A further need which must be borne in mind during the preservation of foodstuffs, in the sense specified above, is that of minimizing the quantity of air in contact with the food during its preservation. This is because when the oxygen contained in it comes into contact with the surface of the food, it causes the known phenomena of oxidization which alter the organoleptic characteristics of the food. In this regard, it should also be noted that even limited surface oxidization of the food is clearly perceptible to the palate. With reference to the lids and containers of the prior art, it should be noted that these, to the extent that they create a tight seal between them, have the drawback that they are unable to minimize the quantity of air contained in the recipient . The problem behind this invention is to devise a lid for recipients, with structural and functional characteristics which meet the above mentioned requirements and, at the same time, overcome the drawbacks which have been mentioned with regard to the prior art. This problem is solved by a lid for recipients in accordance with Claim 1. Further characteristics and the advantages of the lid for recipients according to the invention will result from the description given below of a preferred illustrative embodiment, given by way of example and for non-limiting reasons, with reference to the attached figures, in which: - Figure 1 shows a view in perspective of a lid according to the invention engaged with the mouth of a recipient; Figure 2 shows a side section view of the lid and the recipient in Figure 1; - Figure 3 shows a side section view of the lid in Figure 2 before it engages with the mouth of the recipient; Figure 4 shows a part-section perspective view of a detail of the lid in Figure 3; - Figure 5 shows a side section view of the detail in Figure 4 in two different positions of use; Figure 6 shows a side section view of the lid in Figure 1 during the operation of engaging with the mouth of the recipient; - Figure 7 is a side section view of a lid according to the invention in accordance with a variant of its embodiment . With reference to the figures from 1 to 6, 1 generically indicates a lid for a recipient 2 which, in the example, takes the concrete form of a saucepan. In a completely conventional manner, the recipient 2 comprises a circular bottom and sidewalls 3 which define a mouth 4. The lid 1 comprises a discoid surface 5 and is suitable for engaging the mouth 4 of the recipient 2 in a removable manner, in such a way as to create a tight seal on it. For this purpose, the surface 5 of the lid has a perimetrical edge 6 suitable for making a tight contact with the walls 3 of the recipient 2. More precisely, the edge 6 comprises a sealing lip 7 which, when the lid 1 is engaged with the mouth 4 of the recipient 2 (Fig. 2) , is inserted with force into the mouth 4, in such a way as to make contact with the walls 3 and act like a sealing gasket. Furthermore, the edge 6 comprises a ledge surface 8 extended around the entire circumference, which is positioned above the sealing lip 7 and is suitable for abutting against the top end of the walls 3 of the container 2. When it abuts against the walls 3, the ledge surface 8 makes it possible to limit the insertion of the lid 1 in the mouth 4 of the recipient 2, as shown by the Figures 2 and 6. The lid 1 is preferably made of plastic material and, thanks to its discoid shape, can yield elastically. With particular reference to Figure 6, it is possible to see that by stressing the lid with a force directed perpendicularly downwards (indicated by the arrow F in the figure) , the lid 1 deforms by inflection until it takes a concave configuration after the ledge surface 8 has abutted against the walls 3 of the recipient 2. Advantageously, the lid 1 comprises valve means 9 which permit the passage of air through the surface 5 during the operation of engaging the lid 1 with the mouth 4 of the recipient 2 , in such a way as to reduce the quantity of air contained in the recipient 2. According to a preferred embodiment, the valve means 9 are positioned in the centre of the lid 1 and take the concrete form of an obturator 10 inserted in a complementary obturator seat 11. The obturator 10 can be actuated in the seat 11 between a closed position (Fig. 2) and an open position (Fig. 3), in which the passage of air through the valve means 9, and therefore through the surface 5, is impeded and permitted, respectively. In the example, the cylindrical seat takes the concrete form of a portion of internal surface of a cylindrical sleeve 12 obtained in a single piece with the surface 5. The sleeve 12 extends from the surface 5 upwards. The inside of the sleeve 12 defines a cylindrical through passage. The obturator 10 takes the concrete form of a cylindrical body inserted movably in the seat 11, that is to say in the sleeve 12, between a top position (Fig. 3) and a bottom position (Fig. 2) which, as will become clearer later on in the description, correspond to the aforethe said open and respectively closed positions of the valve means 9. The top end of the obturator 10 terminates in a knob 13 which is external with respect to the sleeve 12 and makes it possible to actuate the obturator inside the seat between the aforethe said open and closed positions, that is to say top and bottom. Grooves 14 extended axially starting from a predetermined distance D from the knob 13 and up to the free bottom end of the obturator 10 are obtained in the external side surface of the obturator 10. As shown in Figure 5, when the obturator 10 is in the closed position, it is completely inserted into the sleeve 12 in such a way as to obstruct the seat 11 completely and ensure tightness. Alternatively, when the obturator 10 is in the open position, it is partially extracted from the seat 11. In this condition, the grooves 14 impede any tight engagement between the side surface of the obturator 10 and that of the seat 11. In substance, the grooves 14 come to constitute vents through which the passage of air through the seat 11, that is to say, through the valve means 9 and therefore through the surface 5 of the lid 1, is obtained. In the closed (bottom) position, the end-of-stroke position of the obturator is determined by the fact that the knob 13 comes to abut against the top end of the sleeve 12. In the open (top) position, the end-of-stroke of the obturator is ensured by an external radial protrusion provided on the free bottom end of the obturator 10, which protrusion comes to abut against an internal step formed in the sleeve 12. In the use of the lid 1, that is, when it is desired to engage the same with the mouth 4 of the recipient 2 to achieve tight closure, it is sufficient to position the lid 1 on the recipient 2 in such a way that it is centred with respect to the mouth 4. At the same time, it is necessary to make sure that the obturator 10 is in the open (top) position. Then, by manually stressing the lid 1 with a force directed perpendicularly downwards (indicated by the arrow F in Figure 6) , the lid 1 is inserted into the mouth of the recipient 2 until the ledge surface 8 comes to abut against the top end of the walls 3 of the container 2. At the same time, the sealing lip 7 comes into contact with the walls 3 of the recipient, acting as a sealing gasket. Continuing to stress the lid 1 in the manner indicated above, the same begins to be deformed elastically by inflection until it takes a concave configuration (Fig. 6) . The inflection of the lid 1 makes it possible to expel the air from the recipient through the valve means 9, that is to say to reduce the quantity of air contained in the recipient 2. At this point, it is sufficient to act on the knob 13 in such a way as to bring the obturator 10 into the closed position (Fig. 2) . By so doing, a tight seal is created between the lid 1 and the mouth 4 of the recipient 2. As a result of the vacuum which comes to be created inside the recipient 2, the lid 1 stays in the aforethe said concave configuration even if it is no longer stressed manually. Advantageously, the insertion of the obturator 10 into the seat 11 can be achieved with a predetermined degree of force, selected in such a way that the force required to obtain the deformation by inflection of the lid 1 is lower than that required to obtain actuation from the open (top) position to the closed (bottom) position of the obturator 10. This makes it possible to carry out the operation of engagement of the lid 1 with the mouth 4 of the recipient 2 by acting on the knob 13 with one hand only. To remove the lid 1 from the recipient 2, it is sufficient to act on the knob 13 in such a way as to bring the obturator from the closed (bottom) position to the open (top) one. This determines the entrance of air into the recipient through the vents formed by the grooves 14, in such a way that the lid 1 can be raised easily and removed from the recipient . With reference to Figure 7, 100 generically indicates a different embodiment of the lid according to the invention. The parts of the lid 100 which are structurally and functionally equivalent to those of the lid 1 are identified using the same reference numbers and are not described below. The lid 100 comprises a knob 101 positioned at the centre of the surface 5. Through holes which constitute seats for housing unidirectional valve means 102 are formed in the surface 5 of the lid 100, that is to say valve means which only allow the air to pass in one direction. In the example, the valve means take the concrete form of a ball obturator 103 which is pushed by the effect of a spring 105 to abut against an obturator seat 104 below. The arrangement of the ball obturator 103 and the seat 104 is such that, during the operation of engagement of the lid 100 with the mouth 4 of the recipient 2, the passage of air is permitted in contrast to the action of the spring 105. Alternatively, the effect of the vacuum which comes to be created in the recipient 2 following the inflection of the lid 100 recalls the obturator 103 to the closed position against the seat 104, impeding de facto the entrance of air into the recipient. As can be appreciated from the above, the lid according to the invention makes it possible to meet the aforesaid needs and to overcome the drawbacks mentioned with regard to the prior art. In fact, as has been explained, the lid according to the invention ensures the tight closure of the recipient. Furthermore, during the operation of engagement of the lid with the mouth of the recipient, the lid makes it possible to evacuate part of the air contained in the recipient, in such a way as to minimize the quantity of air in contact with the food. Another advantage of the lid according to the invention is in the fact that the same is suitable for being engaged with the mouth of a conventional recipient such as a saucepan or similar, permitting the preservation of the food in the same container it is cooked in. A further advantage of the lid according to the invention is in its structural and functional simplicity. Obviously, a person skilled in the art, for the purposes of satisfying contingent and specific requirements, will be able to make numerous modifications and variations to the lid for recipients described above, all, among other things, contained in the context of protection of the invention as defined in the claims which follow. In this way, for example, it is evident that with variations in the form of the mouth of the recipient, the form of the lid will be varied in a corresponding manner. In other words, it is possible to make lids of elliptical, rectangular and other shapes for containers with mouths having these shapes. The obturator and the obturator seat described above can be replaced with other functionally equivalent ones. For example, it is possible to use obturators of the gate- valve, cock and similar types, or obturators operated by rotation can be used.

Claims: CLAIMS 1. Lid for recipients which is designed to engage, in a removable manner, the mouth (4) identified by the walls (3) of a recipient (2) , of the type comprising a surface (5) delimited by an edge (6) suitable for making contact with the walls (3) of the recipient (2) in correspondence with the mouth (4) to create a tight seal, characterized in that the surface (5) of the lid (1;100) yields elastically and the said lid (1;100) comprises valve means (9; 102) to permit the passage of air through the surface (5) of the lid (1;100) during the operation of engagement of the lid (1;100) with the mouth (4) of the recipient (2) , permitting the evacuation of the air contained in the recipient (2) . 2. Lid according to Claim 1, in which the said valve means (9) comprise an obturator (10) inserted into an obturator seat (11) , the said obturator (10) being actuable in the said obturator seat (11) between a closed position and an open position, in which the passage of air through the valve means (9) is impeded and permitted, respectively. 3. Lid according to Claim 2 , in which the said obturator (10) moves slidably in the said obturator seat (11) between the closed position and the open position. 4. Lid according to Claim 2, in which the said obturator (10) comprises a cylindrical body and the obturator seat (11) comprises a complementary cylindrical seat in which the obturator (10) moves slidably between the closed position, in which the obturator (10) is inserted into the obturator seat (11) , and the open position, in which the obturator (10) is partially extracted from the obturator seat (11) , the surface of the obturator (10) comprising at least one groove (14) acting as a vent to permit the passage of air through the obturator seat (11) when the obturator (10) is partially extracted from the obturator seat (11) . 5. Lid according to Claim 4 , in which the said obturator (10) is inserted into the obturator seat (11) by forcing. 6. Lid according to Claim 4, in which a knob (13) is associated with the said obturator (10) and by means of which the obturator (10) can be actuated between the closed position and the open position. 7. Lid according to Claim 1, in which the said valve means (102) comprise a unidirectional valve. 8. Lid according to Claim 1, in which the said edge (6) comprises a sealing lip (7) suitable for acting as a gasket to ensure the tight closure of the lid (1;100) with the recipient (2) . 9. Container according to Claim 8, in which the said sealing lip (7) is suitable for being inserted under pressure into the mouth (4) of the recipient (2) . 10. Container according to Claim 8, in which the said edge (6) comprises a ledge surface (8) suitable for abutting against the walls (3) of the recipient (2) during the operation of engagement of the lid (1;100) with the mouth (4) of the recipient (2) , to limit the insertion of the lid (1;100) into the mouth (4) of the recipient (2) . 11. Container according to Claim 8, in which the said lid (1;100) has a discoid shape. 12. Container according to Claim 1, in which the surface (5) of the lid (1;100) yields elastically by inflection, the said surface (5) arranging itself in a concave form being stressed by a force (F) perpendicular to it.

Inventors: IACCHETTI GIULIO, RANZONI FRANCESCO, IACCHETTI, GIULIO, RANZONI, FRANCESCO
Applicants: BIALETTI IND SPA, IACCHETTI GIULIO, RANZONI FRANCESCO, BIALETTI INDUSTRIE S.P.A., IACCHETTI, GIULIO, RANZONI, FRANCESCO
Application year: 2000
Main classification: A47J47
IPC codes: A47J36, A47J47, B65D43, B65D51, B65D81