Container lid with sealing device

Abstract: The invention discloses a lid with a sealing device for containers comprising a horizontal top (2; 50; 62), at least one air tube (6;51;63;73;83) attached to the lid (1;50;60;71;81), one or more suction cups (8;55;67;75;74;85,84) attached to the air tube and a hole (9;53;77;87) made in the lid and communicating with each air tube. Each suction cup accomplishes its sealing action between the lid and the container on which said lid is applied, when the air tube to which each suction cup is attached is expanded by a compressed fluid and causes said suction cups to adhere against the edge of the container and/or the lid applied on the container itself.

Description: The invention concerns a container lid with a sealing device. It is a known fact that, in order to protect substances held within containers, the latter are closed by lids which seal them in the area where the container and the lid match. Thus, for instance, containers for industrial use, which are commonly called barrels and are meant to contain especially lubricating oils, hydrocarbon liquids, acids and the like, are closed by lids presenting a shaped annular ridge, through which they are solidly riveted into the upper rim of the barrel. Said lids achieve an air- and water-tight seal, but present the inconvenience that, once the barrel has been emptied, it can not be re-used. In fact, in order to re-use it, it is necessary to clean its inside, after the lid has been removed by cutting off the annular rim which attaches it to the barrel. This operation deforms the rim of the barrel which becomes unsuited to receive other lids and, therefore, cannot be re-used. Said barrel can be used at best as a generic container, but it presents the inconvenience that, apart for the deformed rim, it can also be dangerous, particularly if the barrel is made of metal. If the barrel is meant to contain substances in grain or powder form, such as, for instance, dyes, bonding agents and the like, and at any rate, substances which do not require an absolutely tight seal, lids are used, which present one or more perimetral rims which, when pressed, snap because of elastic deformation into matching rims of the barrel. In this case, since the lid can easily be applied and removed, it offers the advantage of making it possible to re-use the barrel, since it is easy to reach its interior for cleaning purposes, without damaging the rim of the container on which the lid is applied. The inconvenience presented by this type of lids is that they do not hermetically close the container. The FR-A-1 310 018 discloses a sealing device for a lid of a container in which sealing means like O-ring or the like are pressed against the cylindrical surface of the container through a toroidal inflatable chamber. This device does not provide means for the reciprocal movement of the lid in respect of the container. In the special branch of the manufacture of lead-acid storage batteries it is a know fact that the lids sealing the containers which hold the elements of the battery must perform two important tasks. The first task is to guarantee the tight sealing of the container thereby preventing the spilling out of the electrolyte contained therein, which, considering its high degree of corrosive power, may cause considerable damage. A second but not by any means minor task is that they must allow for the lengthening of the poles, particularly of the positive pole which, because of electrochemical phenomena, becomes longer during the life span of the battery. Thus the poles are prevented from pressing against the lid, while the tight sealing of the lid itself is safeguarded. As far as the tightness is concerned, it is guaranteed by sealing the lid to the container holding the poles of the accumulator battery by means of bonding agents, or by creating both on the lid and on the container rims which come into mutual contact through special profiles matching each other. On the other hand, as far as the extension of the poles is concerned, it is allowed for both by using bonding agents with a very high yield point or by suitably shaping the surface of the lid or still by shaping the seats of the poles thus making them elastic and deformable. The just-described known methods, while being priseworthy for solving both the problem of the hermetic seal and that of the lengthening of the poles, present some inconveniences. Concerning the method of obtaining of the hermetic seal through the use of bonding agents with a high yield point, it presents the inconvenience that, when it becomes necessary to remove the lid, in order to perform maintenance operations on the accumulator battery, the removal is done with difficulty. In fact, it is necessary to remove the bonding seam, which often leads to damage to the container lid. On the other hand, if the sealing method foresees the shaping of matching rims between the lids and the containers, it may occur that lids and containers are not interchangeable, apart for the fact that costly and complex moulds are necessary to manufacture them. Concerning the method of deformability, the manufacture of lids with surfaces presenting special shapes, not only requires the use of complex moulds, it also does not solve the problem in lids having a limited width in comparison with their length, since present an insufficient degree of elasticity. On the other hand, the production of elastic and deformable seats for the poles is not cost-efficient because of the expense involved in the moulds necessary for said production. The present invention proposes to overcome the mentioned inconveniences by disclosing a container lid with a sealing device whose main purpose is that of guaranteeing a stable connection between the lid and the container, while insuring its air and water tightness. Another purpose of the invention is to disclose a lid with a sealing device which, while insuring the water and air tightness, is also elastic and deformable. Yet another purpose of the invention is to disclose a lid with a sealing device, wherein the assembly on and the removal from the container is easier and quicker as compared to the lids of the known types. Not the least purpose of the invention is to disclose a lid with a sealing device which can be assembled on containers of any kind, as long as the upper edge of the container presents a flat and smooth surface. The above-mentioned purposes and others which will be better described hereafter are reached by a container lid with a sealing device, the main features of which are according to claim 1 - According to a preferred embodiment of the invention, the lid with a sealing device presents its annular skirt arranged within the perimeter of its horizontal top. According to another embodiment of the invention the lid with a sealing device presents its annular skirt arranged along the perimeter of its horizontal top. In both of these embodiments of the lid the air tube of the sealing device can be connected with the lid itself according to three preferred embodiments. A first embodiment foresees the connection of the air tube to the lid by gluing it to the latter's annular skirt. Another embodiment foresees the connection of the air tube to the lid through a projection belonging to the air tube which, when pressed, penetrates into a corresponding indentation obtained within the annular skirt of the lid. Yet another embodiment foresees the connection of the air tube to the lid through a further suction trough, also belonging to the air tube and attached to it on the opposite side of the suction trough which is connected with the edge of the container or is attached at 90 degrees in relation to this sealing suction trough. In this case the connecting further suction trough also acts as a sealing agent. Advantageously according to the invention, a lid with a sealing device is disclosed which, when it is applied on barrels for liquid or solid materials of any kind, always permits the hermetic sealing of the same, while guaranteeing an easy assembly and removal of the lid itself. Moreover, the lid can be removed from the container without damaging the junction rims and easily permitting to clean the container and as easily and economically to re-use both the container and the lid. Moreover, the lid with a sealing device according to the invention allows for the lengthening of the poles when applied to the known-type containers of electric accumulator batteries, thanks to its elasticity. It also simplifies the maintenance operations on the poles and the plates of the battery because of its easy assembly and removal, whereby the danqer of damaging either the container or the lid is eliminated, while this can occur when using lids of the known type, which are either welded or glued to the container. Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and the specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the claims will become apparent to those skilled in the art from this detailed description and from the drawings, wherein; Fig. 1 shows the lid with a sealing device of the invention applied on a container and not in its sealing position, in the embodiment wherein the annular skirt is arranged within the perimeter of its horizontal top and the air tube is glued to the lid along its annular skirt; Fig. 2 shows the lid of Fig. 1 while the air tube is being inflated; Fig. 3 shows the lid of Fig. 2 with the suction trough in its sealing position against the edge of the container, after the air tube has been inflated; Fig. 4 shows the lid of the invention of Fig. 3 while the air tube is being deflated and the suction trough comes off the container; Fig. 5 represents the lid of the invention with the suction trough in its sealing position against the container in the embodiment wherein the annular skirt is arranged along the perimeter of its horizontal top and the air tube is glued to the lid along its annular skirt; Fig. 6 shows the lid of Fig. 1 in the embodiment wherein the air tube is applied along the annular skirt of the lid by a pressure inserted projection; Fig. 7 shows the lid of Fig. 1 in another embodiment wherein trough the air tube is attached to the lid through a suction trough adhering to the annular skirt of the lid itself; Fig. 8 represents the lid of the invention in yet another embodiment wherein the air tube is attached to the lid through a suction trough adhering to the underside of the horizontal top of the lid. The lid with a sealing device according to the invention is represented in Fig. 1 where it is indicated as a whole with 1. It can be observed that is comDrises a horizontal toD 2 presenting an annular skirt 4, arranged within its perimeter on the outside of which is attached the sealing device comprising an air tube 6 having a toroidal shape to which, in turn, a suction trough 8 is attached. The suction trough 8 is connected along the entire outer perimeter of the air tube 6 and , therefore, it also acquires an annular configuration, completely surrounding the toroidal air tube 6. I will be pointed out, however, that the air tube can have a shape differring from the toroidal configuration and that it can also be made in sections, for instance, even not connected with each other and, at any rate, arranged next to each other in succession, each being attached to the annular skirt 4 of the lid. Similarly, the suction trough, instead of having an uninterrupted annular configuration, can also be made in sections, not even connected with each other, each being attached to its respective air tube. The air tube 6 is kept adhering to the annular skirt 4 through a bonding seam 3, and it communicates with the outside environment through a hole 9 which is bored in the horizontal top 2 of the lid. In Fig. 1 the lid 1 of the invention is represented over a container 20 and it can be observed that the annular skirt 4 of the lid is placed within the container 20 with the suction cup facing the inner wall of the upper edge 21 of the container itself. The connection of the lid 1 with the upper edge 21 of the container 20 occurs, as can be observed in Fig. 2, when air is blown through hole 9 with direction 10 into the air tube 6. The air tube is inflated and it radially pushes the suction trough, which, therefore is pressed against the inner surface of edge 21 of container 20, to which it remains attached because of the atmospheric, pressure acting on the outer surface 12 of the suction trough 8, as can be observed in Fig. 3. In this situation lid 1 is securely bound to container 20 and the the seal between edge 21 and the lid is hermetic. It can be observed, in fact, that the outer surface 16 of the suction trough 8 and the outer surface 13 of the air tube 6, both of which are turned toward the interior of the container 20, do not present any point of discontinuity along the perimeter of the annular skirt 4, so that any material contained within container 20 may not spill out, nor can any external material enter. If one desires to remove lid 1, it is sufficient, as can be observed in Fig. 4, to expel the air from the air tube 6 in the direction indicated by arrow 15, so as to create a depression which radially withdraws the suction trough 8 and detaches it from edge 21 of container 20. Lid 1 is thus free and can easily be removed. It will, therefore, be noticed how the purpose of disclosing a lid, which, besides offering a hermetic seal of the container, can also be easily applied and as easily removed, has been fulfilled. When the lid is applied on normal containers holding liquids or solids, it also offers the advantage that it allows the opening of the barrel, which can be washed and re-used. On the other hand, if the lid is applied on containers for lead-acid storage batteries, it permits to easily close the container and to open it in order to allow maintenance operations on the plates and the poles, without the danger of damaging either the edge of the container or the skirt of the lid. By observing Fig. 2, it can be noticed that when the lid is connected with container 20 and the suction cup is in its sealing position, between lid 1 and edge 21 of container 20 there remains a hollow space 18 which permits the vertical displacement of lid 1 in relation to container 20 without compromising the sealing action of the suction trough, thanks to the elasticity of the suction trough and of the air tube at their junction point. This possibility of the lid to vertically slide in relation to the container permits to stack the material-holding barrels, when the lid is applied on said barrels.In fact, when a barrel is stacked on another, lid 1 sinks vertically until the inner surface of its top rests against the upper part of edge 21 of container 20. In this case the weight of the upper barrel is not supported by the horizontal top 2 of the lid, but rather by the lateral walls of container 20 and this yields an improved structural safety of the containers and of the sealing action of the suction trough, which is not compromised. This possibility of the lid to vertically slide in relation to the container also bcomes very useful when the lid 1 according to the invention is applied on containers for lead-acid accumulator batteries, wherein the possibility of the lid to vertically slide, permits to compensate for the lengthening of the poles. Fig. 5 shows an embodiment of the lid with the sealing device according to the invention based on the same idea of solution, wherein the annular skirt 52 of lid 50 is positioned along the perimeter of the horizontal top 59 of lid 50. In this embodiment the toroidal air tube 51 is applied, again through a bonding seam 58, on the inner wall of skirt 52 of the lid. When lid 50 is placed on container 57, the air tube 51 and the suction trough 55 which is attached to it, arrange themselves along the outer edge 56 of container 57, so that, when air is blown into the air tube 51 through hole 53, the suction trough 55, which is connected with it, is forced radially against the outer edge 56 of container 57, thereby guaranteeing its hermetic seal. This embodiment also fulfils all the proposed purposes of the lid according to the invention, as has been previously described. Both the just described embodiments of the lid according to the invention can also be made according to a variation of solution which foresees the connection between the air tube and the annular skirt of the lid through a pressure inserted projection, rather than through gluing. This variation is represented in Fig. 6 and is applied to the embodiment wherein lid 60 presents its annular skirt 61 arranged innerly in relation to the outer perimeter of its top 62. In this embodiment the air tube 63 with the suction cup 67 presents a peg 65 which, when pressed, penetrates into a corresponding indentation 66 obtained in the skirt 61 of the lid and guarantees the stable connection between the two. Yet another variation is possible concerning the connection between the air tube and the lid, which, as can be observed in Fig. 7, is obtained by providing the air tube 73 with vet another suction trough 74 connected with the air tube 73 and being an integral part of it, which is positioned on the opposite side in relation to the suction trough 75, which seals the outer edge 76 of container 70. The connection of the air tube 73 with the skirt 72 of lid 71 occurs because of the suction trough 74 adhering to skirt 72 of the lid when the air tube 73 is inflated by, blowing air into it through hole 77. In this case the suction trough 74 not only connects the air tube 73 with the skirt of the lid, it also acts as a sealing element on the edge of the container, as does the suction trough 75. Yet another variation concerning the connection of the air tube to the lid is represented in Fig. 8, where it can be observed that the air tube 83 presents a further suction through 84 connecting it to the lid 81 and which is arranged at 90 degrees in relation to the suction trough 85, acting as a seal on the outer edge 86 of container 80. The connection of the air tube 83 with lid 81 occurs because the suction trough 84 adheres to the lower surface of the horizontal top of the lid 81 when air is blown into the air tube 83 through hole 87. In this case, too, the suction trough 84, besides connecting the air tube with the lid, also acts as a sealing, as does the suction trough 85. By observing Fig. 8 it can be noticed that in this variation of embodiment the annular skirt 88 of lid 81 presents an L-shaped profile which lodges and supports the air tube 83. The described variations of solution concerning the connection between the air tube and the lid can also be applied to the embodiment of the lid, whrein its annular skirt is arranged along the outer perimeter of its horizontal top. All the described variations concerning the connection between the air tube and the different embodiments of the lid fulfil all the proposed purposes which have previously been described. First of all, the purpose of obtaining a lid guaranteeing an hermetic seal, together with the possibility of being easily assembled and removed, has been reached. This yields the double advantage of safety against the spilling of the product outside the container and against the penetration of external materials into the container, together with the possibility of easily removing the lid without damaging either the container or the lid. In the cases, when the lid is applied to normal barrels meant to hold liquid or solid materials, this feature yields the possibility of re-using the container, which can easily be opened by removing the lid. On the other hand, when the lid is applied on containers holding the elements of lead-acid storage batteries, it presents the advantage of simplifying the maintenance operations on the poles and on the plates by removing the lid itself, without any danger of damaging either the container or the lid. It has also been seen how this lid can slide vertically in relation to the container, while still preserving intact its sealing action. When the lid is applied on common containers, such as barrels meant to hold liquid or solid materials, this feature permits to stack the barrels on each other, thanks to the capacity of the lid to vertically slide in relation to the container. On the other hand, when the lid according to the invention is applied on lead-acid storage batteries, this possibility of sliding vertically allows for the lengthening of the poles, thereby avoiding stresses on the lid. During the manufacturing process the elements constituting the lid may undergo various modifications concerning their shape or their dimensions. For instance, the air tubes may be more than one in number and each of them can be made in sections, separated from each other. This modification may be useful if one of the air tube is perforated, in order to prevent that, while the hermetic seal fails, the mechanic seal between the lid and the container should also fail completely. In the same way the suction cups can also be more than one in number, each connected with its respective air tube. In any case it is understood that variations and modifications are still to be considered within the scope of the claims.

Claims: A lid with a sealing device for containers comprising: a top (2; 50; 62) with a downwardly depending annular skirt at least one inflatable air tube (6; 51; 63; 73; 83) attached to the lid (1; 50; 60; 71; 81) through connecting means (3; 65; 66; 74; 84) trough shaped sealing means connected with the air tube and co-operating with the edge (21; 56; 76; 86) of the container on which the lid is applied characterized in that said sealing means are shaped as suction troughs (8; 55; 67; 75; 74; 85; 84) elastically connected with the air tube ( 6; 51; 63; 73; 83) said elastic connection permitting a relative movement between the lid and the container during the sealing. A lid with a sealing device for containers according to claim 1, characterized in that the annular skirt (4;61;72;88) of the lid (1;60;71;81) is arranged within the perimeter of the horizontal top (2; 62) of the lid itself. A lid with a sealing device for containers according to claim 1, characterized in that the annular skirt (52) of the lid (50) is arranged around the outer perimeter of the horizontal top (59) of the lid itself. A lid with a sealing device for containers according to one of the preceding claims, characterized in that the air tube (6; 51) is connected with the lid (1; 50) through a gluing agent (3) along the annular skirt (4;52) of the lid. A lid with a sealing device for containers according to one of the claims from 1 to 3, characterized in that the air tube (63) is connected with the lid (60) through a projection (65) belonging to the air tube (63) which penetrates under pressure into a corresponding indentation obtained in the annular skirt (61) of the lid. A lid with a sealing device for containers according to one of the claims from 1 to 3, characterized in that the air tube (73; 83) is connected with the lid (71; 81) through at least one further suction trough (74; 84) belonging to the air tube (73; 83) itself. A lid with a sealing deyice for containers according to claim 6, characterized in that the further suction trough (74) connecting the air tube (73) with the lid (71) is attached to the air tube (73) itself on the opposite side where the sealing suction trough (75) is attached. A lid with a sealing,device for containers according to claim 6, characterized in that the further suction trough (84) connecting the air tube (83) with the lid (81) is positioned on the air tube (83) itself at 90 degrees in relation to the sealing suction trough (85). A lid with a sealing device for containers according to claim 1, characterized in that the air tube has a toroid shape. A lid with a sealing device for containers according to claim 1, characterized in that the air tube consists of sections, some of them being aligned and eventually separated from each other.

Inventors: STOCCHIERO OLIMPIO, STOCCHIERO, OLIMPIO
Applicants: STOCCHIERO OLIMPIO, STOCCHIERO, OLIMPIO
Application year: 1991
Main classification: B65D53
IPC codes: B65D53, F16J15