CONTAINER

Abstract: According to the invention a container existing of container members is provided comprising indication means for indicating the extent of an overpressure or underpressure applied in the container. Preferably the container parts comprise the cover (2) and a container body (1), between which an annular, deformable indication member (3) is provided as indication means.

Description: The invention relates to a container according to the preamble of the main claim. Containers of this type are already known and may be used for storing foodstuffs. US-A-2.126.212 relates to such a container comprising a vacuum seal indicator. In a fixed cover an opening is provided which is closed by an indicator cap (removable cover). Between the indicator cap and the removable cover a flexible sealing ring is positioned. If the pressure within the container is sub-atmospheric the indicator cap will remain in an effective sealing position. If, however, air should leak into the container, the pressure within the container will increase and the indicator cap will become loose and will fall off when the can is handled. This means, however, that a vacuum indication is only obtained when the can is handled and not when the can is not handled. Thus, this known container does not allow a purely visable inspection of the present pressure difference. It is an object of the invention to provide a container of the type mentioned before, in which this disadvantage is moved in a simple but nevertheless effective way. Therefore, the container according to the invention is characterized as set forth in the main claim. The extent, in which the deformable means is housed in the recess means and is covered by the leg means offers a visual indication of the degree of pressure difference. Thus, it is possible, without handling the container, to check the present status of the container. It is noted, that DE-A-2926728 shows an evacuated container with recess means and leg means adjacent to a deformable means. However, this deformable means does not offer an indication of a present pressure difference between the interior of the container and the surroundings, but is meant to allow a tilting motion of the container members relative to each other when experiencing shocks without destroying the evacuated situation. It is handy then if at a certain pressure difference, the deformable means is fully accommondated in the recess and is fully covered by the leg means. If therefore the deformable means is not visible anymore one knows that the applied pressure difference is still present. If however the deformable means is only covered partially, this is an indication for the fact that the pressure difference has diminished or even totally vanished. According to a preferred embodiment of the container according to the invention one container member comprises at its circumference cooperating with the other container member a wall member with a U-shaped cross section, wherein the recess means accommodating the deformable means is defined by the space between the legs of the U-shaped wall member. In this way a simple construction is obtained that however offers a very effective function. In this respect it is further possible, that the outer leg of the U-shaped wall member is shorter than the inner leg. Here the long leg can provide a reliable positioning of the deformable means. Although it is possible that the deformable means is an integral part of one of the container members according to another embodiment of the container according to the invention a deformable means is provided that is accommodated releasably in the recess means. Such a deformable means may for example include a compressible ring. For improving the deformability of such a deformable means it is further possible, that it is hollow, whereas it is preferred, that it is made of thermoplastic rubber. For increasing the serviceability of the container according to the invention it is possible, that the deformable means comprises a scale division cooperating with the leg means. By means of such a scale division the magnitude of the pressure difference between the interior of the container and the surroundings can be defined. If the deformable means further functions as a sealing member between the container body and cover the container according to the invention includes a minimal amount of parts and is therefore less complicated. Hereafter the invention will be elucidated by means of the drawing, in which a number of embodiments of the container according to the invention are illustrated. Figure 1 shows a schematic sectional view of the first embodiment of the container according to the invention; Figure 2 shows part of a container according to figure 1 on a larger scale and unloaded; Figure 3 shows the part according to figure 2, however, loaded; Figure 4 shows part of another embodiment of a container according to the invention in an unloaded situation; Figure 5 shows the part according to figure 4 in a loaded situation; Figure 6 shows part of a further embodiment of the container according to the invention in an unloaded situation; and Figure 7 shows the part according to figure 6 in a loaded situation. In figure 1 the container according to the invention is shown schematically and in section. This container comprises a container body 1, that is intended to receive products, such as foodstuffs or the like, and a cover 2 sealingly applicable thereto. Between the cover 2 and the container body 1 an indication member 3 is provided for indicating a pressure difference that can be applied between the interior of the container and the surroundings. The container shown in figure 1 is intended to be provided with an internal overpressure or underpressure. To this end this container comprises in its cover a one way valve 4 through which air can be removed from the interior of the container. The one way valve 4 preferably forms part of a plug as described in the European patent application 0.234.607. This plug can form an integral part of the cover 2, but it is possible too that this plug with one way valve is provided in the container body 1. Moreover, it is possible that the indication member described here is not provided between the cover and the container body but between the cover and the plug, or between the container body and the plug. The function of the container will not be influenced essentially by this. The indication member 3 comprises a means that is deformable when loaded, whereby the extent of deformation represents a visual indication of a present pressure difference between the interior of the container and the surroundings. As appears clearly from the part shown on a larger scale in figure 2 of the container represented in figure 1 the cover 2 comprises the recess 5 in which the indication member 3 is at least partially accommodated. The cover 2 comprises at its circumference cooperating with the container body 1 a wall member having a U-shaped cross section, wherein the recess 5 accommodating the indication member 3 is defined by the space between the legs 6 and 7 of the U-shaped wall member. The indication member 3 now with its one side is locked up in the recess 5, whereas the other side of the indication member 3 engages the corresponding section of the container body 1. For this reason the container body 1, as shown, may be provided with a recess 8 for centring the indication member. In the position of the cover 2 relative to the container body 1 shown in figure 2, in which there is no or hardly any underpressure in the container, the outer end of the outer leg 6 of the U-shaped wall member is positioned at some distance from the uppermost end of the container body 1. As a result a great part of the indication member 3 as well as a scale division 9 provided thereon is visible. If now a underpressure is applied in the container the cover 2 is moved towards the container body 1 such that a position according to figure 3 will be provided. In this position the distance between the end of the outer leg 6 and the uppermost end of the container body 1 has become smaller, so that only a small part of the scale division 9 is still visible. The indication member 3 that initially was accommodated with clearance in the recess 5 and the recess 8 now is compressed in the recess 5 and the recess 8, as is allowed by the material from which this indication member 3 is fabricated. In the position shown in figure 3 only a small part of the scale division 9 is visible, and this represents a clear visual indication of the underpressure present now in the container. Of course the shape of the container can be such, that the end of the leg 6 completely engages the uppermost end of the container body 1 such that, if a certain value of underpressure is present in the container, the indication member 3 is not visible at all. A container shaped in such a way is very easy in its use for only then sufficient underpressure is present if the indication member 3 is not visible. As appears clearly from the figures 2 and 3 the outer leg 6 is shorter than the inner leg 7 of the U-shaped wall member. The outer leg 6 is substantially aligned with the adjoining wall of the cooperating container body 1. The inner leg 7 is inwardly off-set relative to this wall and as it were is guided by the innerside 10 of this wall. In a variant not shown the outer leg 6 is longest and is transparent, so that the indication member remains visible for indicating the pressure difference. In the embodiment according to figure 2 and 3 the indication member 3 is accommodated releasably in the recess. In this case this indication member comprises a compressable ring, that (in a way not shown) possibly can be hollow. The material of the indication member 3 for example may be thermoplastic rubber. It will be clear, that in the shown embodiment of the indication member 3 it functions as a sealing member between the cover 2 and the container body 1 too. The figures 4 and 5 show a second embodiment of the container according to the invention. Between the container body 11 and the cover 12 again an indication member 13 is provided being an integral part of the cover 12. In the position shown in figure 4 there is no or hardly any underpressure in the container. When applying an underpressure in the container the situation shown in figure 5 is obtained. In this situation the outer leg 14 of the cover 12 is positioned at a shorter distance from the container body 11 than in the situation shown in figure 4. Again it is possible to provide the indication member 13 with a scale division or to take provisions that in the desired underpressure situation the outer leg 14 completely engages the container body 11, so that the indication member 13 is not visible. In contrast with the embodiments according to figure 1 until 5 the embodiment according to figure 6 relates to a container that is suited to be internally pressurised. In this case the interior of the container is meant to be at the right-hand side of the shown figure, whereas the surroundings are positioned at the left-hand side of the figure. Again one can see a cover 15, a container body 16 and an indication member 17. In the position shown in figure 6 the interior of the container is not or hardly pressurised, whereas in the position shown in figure 7 there is a certain overpressure. Previously we have mentioned containers that all comprise a container body and a cover with an indication member there between. Especially in the embodiments according to the figures 1 until 5 the cover can be easily released from the container body. In the embodiment according to figures 6 and 7 applying and releasing the cover 15 with respect to the container body 16 is more difficult however. In such a case it is possible that the cover can not be released from the container body but always remains connected therewith through the indication member 3. For putting products or the like in the container or removing them therefrom it is possible then that in the cover or in the container body a closable opening is provided. Moreover, it is indeed possible that between the cover and the container body (or any other container parts) a deformable member is provided, but that this does not form the real indication member. In such a case the indication member is formed by the cover and the container body themselves by means of a cooperating scale division, that provides an indication of their relative position and thus the present pressure difference between the interior of the container and the surroundings. It is possible for example that a part of the cover or container body is transparent and cooperates with a part of the container body or cover that is provided with a scale division, said latter part being positioned behind the transparent part. In such a case the deformable member only acts as a resilient member.

Claims: Container comprising a container body (1, 11, 16), a removable cover (2, 12, 15) and a deformable means (3, 13, 17) positioned between the container body and the cover, said means (3, 13, 17) allowing the indication of a pressure difference between the interior of the container and the surroundings, such as when the container is evacuated, characterized in that the container body (1, 11, 16) and the cover (2, 12, 15) comprise, at their cooperating sections, recess means (5, 8) and leg means (6, 14) outwardly thereof for, dependent upon the degree of the pressure difference, more or less housing and covering, respectively, the deformable means (3, 13, 17) for providing a visual indication of said degree of pressure difference. Container according to claim 1, characterized in that, at a certain pressure difference, the deformable means (3, 13,17) is fully accommodated in the recess (5,8) and is fully covered by the leg means (6,14). Container according to claim 1 or 2, characterized in that one container member (1, 2) comprises at its circumference cooperating with the other container member (2, 1) a wall member with a U-shaped cross-section, wherein the recess means (5) accommodating the deformable means (3) is defined by the space between the legs (6, 7) of the U-shaped wall member. Container according to claim 3, characterized in that the outer leg (6) of the U-shaped wall member is shorter than the inner leg (7). Container according to claim 3, characterized in that the outer leg (6) is longer than the inner leg (7) and is transparent. Container according to one of the claims 1-5, characterized in that the deformable means (3,13,17) is accommodated releasably in the recess means (5,8). Container according to claim 6, characterized in that the deformable means is hollow. Container according to one of the claims 1-5 or 7, characterized in that the deformable means forms an integral part of one of the container members. Container according to one of the claims 1-8, characterized in that the deformable means (3,13,17) comprises a scale division (9) cooperating with the leg means (6,14). Container according to one of the claims 1-9, characterized in that the deformable means (3,13,17) further functions as a sealing member between the container/body (1,11,16) and cover (2,12,15).

Inventors: SCHNEIDER, BERNARDUS JOHANNES JOSEPHUS AUGUSTINUS
Applicants: SCHNEIDER, BERNARDUS JOHANNES JOSEPHUS AUGUSTINUS
Application year: 1989
Main classification: B65D81
IPC codes: B65D88, B65D79