EP0250042B2

EP0250042B2 - Cover for a storage container for liquid

Info

Publication number: EP0250042B2
Application number: EP87201123A
Authority: EP
Inventors: Arnoldus Henricus Bernadina Cornelis Peels
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-06-16
Filing date: 1987-06-12
Publication date: 1993-08-04
Anticipated expiration: 2007-06-12
Also published as: NO872482D0; DK303187A; DK303187D0; ES2012387B3; ATE48260T1; NL8601546A; DE3761042D1; EP0250042A1; NO872482L; EP0250042B1

Abstract

Cover (3) for closing an opening in a storage container (1) for a liquid, in particular beer, which liquid is stored in a bag (6), preferably made of plastic material, said bag (6) being located inside the storage container (1) and being provided with a spout (7), in which cover (3) there is present a feed-through pipe (5) for the liquid for effecting a liquid-tight connection of the interior of the bag (6) to a pipe located outside the container, for supplying or discharging the liquid.

Description

The invention relates to a cover as outlined in the precharacterising portion of claim 1. The invention also relates to a storage container provided with a cover.
Such a cover is known by public prior use mode thereof.
Storage containers for liquids may have the most diverse shapes and be provided with supply and discharge pipes for the liquid. For liquids which are intended for consumption, in particular beer, relative small barrels, up to approximately 50 litres, were used of old, which barrels had to be exchanged all the time. Said exchanging of the barrels was not only a heavy but also a very time-consuming occupation, i.a. because the required connections with the tap pipes had to be made. Besides it was not possible to draw off during exchanging unless use was made of installations having more than one barrel, which is only possible in large catering establishments. The last few years large and medium-sized catering establishments have therefore switched over to containers having a fixed arrangement on the premises of the catering establishment. Said storage containers are not exchanged but filled from a tank lorry via coupling pipes suitable for that purpose. The capacity of such storage containers having a fixed arrangement, also called storage tanks, may be chosen between 200 and 1000 litres, according to the size of the catering establishment. The arrangement of such storage containers is relatively free and therefore both horizontally and vertically arranged containers are used.
Although the invention is not restricted to use with liquids suitable for consumption, e.g. for beer, use with said liquids is of special importance indeed. This is connected with the fact that a particularly great deal of attention needs to be paid to hygiene, i.a. because statutory regulations require so. It is e.g. necessary to clean the storage containers and the pipes connected thereto regularly by rinsing, so that no bacterial orfungal growth can occur. Said cleaning is of course a time-consuming activity and therefore a switch-over to the use of storage containers has been made since a few years, in particular for the storage of beer, whereby the liquid cannot come into contact with the actual wall of the container, which usually consists of metal, e.g. stainless steel or aluminium. This is especially importantforthe storage of beer, because beer is a liquid which is very sensitive to impurities. The solution of the problem described above was found by providing a bag, in which the beer is stored, in the storage container. This bag must be flexible, of course, so that by applying pressure, e.g. carbonic acid pressure, on the outer wall of the bag the beer can be pressed out of the bag. Preferably the bag consists of thin-walled, flexible plastic material, therefore. When the stock of beer is renewed the old plastic bag is completely removed and disposed. Subsequently a new bag is provided in the tank, the tank is closed and beer is put into the bag from a tank lorry via a supply pipe.
Of course it is essential that there is an absolutely liquid-tight connection between the interior of the bag and the tap pipe and also the temporarily provided supply pipe of beer from the tank lorry. For that purpose a feed-through pipe was fixed to the wall, usually of metal, of the storage container up to now and the plastic bag was provided with a relatively narrow spout, which was fixed liquid-tight around or inside the end of the feed-through pipe in the interior or the storage container. It stands to reason that it is necessary thereby to provide an opening somewhere in the tank through which the plastic bag, in more or less folded condition, can be put in and the spout can be slid inside or around the supply pipe. The opening through which the bag has been put in is of course closed with a cover afterwards. Said hole must be provided at such a location, however, and have such a size that there is sufficient space for sliding the spout around or inside the end of the feed-through pipe by hand or with an auxiliary means, e.g. a stick. All this requires a special dexterity and is time-consuming , especially because there has to be absolute certainty that the connection of the interior of the plastic bag to the feed-through pipe is tight. The purpose of the invention is to avoid this disadvantage and to obtain other advantages, which will be explained hereinafter.
In many cases the storage container will be provided with means for keeping the contents cool. For that purpose use is often made of an insulation layer, in particular polyurethane foam, to be provided around the wall, preferably of metal, of the storage container. As this layer cannot be very thin the disadvantages summed up hereinabove are even magnified.
A cover according to the invention wherein the above disadvantages are obviated is further outlined as indicated in the characterising portion of claim 1.
As the feed-through pipe according to the invention is located in the cover with which the opening through which the bag can be put into the storage container can be closed, it is possible to effect the connection between the bag, in particular via the spout of the bag, and the feed-through pipe before the bag is provided in the interior of the storage container. The spout of the bag can therefore be easily provided in the correct place, without any auxiliary means and it is possible to check immediately whether the liquid-tightness can be guaranteed. With the present invention the spout of the bag is provided in the interior of the feed-through pipe and the final closing is obtained by inserting a tubular part into the interior of the spout from the outside of the cover, said part having an outside diameter so much smallerthan the interior of the outer part along a certain length that the spout of the bag can be clamped liquid-tight between the two parts. Said part of the inner pipe may be somewhat conical at the side turned to the bag, whereby the smaller diameter is located at the side of the bag. The spout may have a thickening at the outermost edge, said thickening fitting into a groove present in the outer feed-through pipe. This is of particular importance when the material of the bag and of the spout is not very thick. Possibly one or more protrusions may be provided in the groove with this embodiment, said protrusions pointing inwardly and co-operating with recesses in the thickened edge of the spout. By this embodiment the position of the bag is fixed relative to the position of the feed-through pipe, which may be of importance under certain circumstances, e.g. when the bag has an asymmetric shape.
With regard to the manufacture of the bag it may be advantageous when the spout is not directly formed together with the enclosure of the bag. This applies in particular when the spout is provided with recesses. It is possible then to make a separate forming piece, consisting of a spout with a flange. Said flange may be connected, by glueing or welding, to the enclosure of the bag which is of course provided with a feed-through opening at the spot of the spout.
The closing of the cover on the storage tank may be effected in various manners. It has proved to be advantageous, however, for a cover according to the invention to have such a shape that it can be put into the container through the opening and the closing of the opening is effected at the inside of the container e.g. by rotating the cover. This manner of closing is known by itself for a tank not having an inner bag. By pulling the cover against the inner side of the storage container via a bow construction closing becomes complete. For this construction it has proved to be advantageous, for manufacturing reasons, for the lid to have an oval shape.
Closing with a cover at the inside of the storage container is of particular importance when the storage container is surrounded by an insulation layer, e.g. of polyurethane foam. Said layer is namely not sufficiently hard for providing a lid at the outside closing the container tightly. If the lid thereby consists of a flat plate it will be desirable to increase the heat insulation at the location of the cover. This might be done by providing a separate inserted piece of an insulation material, e.g. polyurethane foam, but according to a particularly advantageous embodiment of the invention the cover is constructed as a closed hollow box with a supply pipe leading therethrough. This prevents a separate operation for providing insulation at the spot of the cover. For realising the closing the box is provided with a protruding collar at the side turned to the interior of the storage container. The closing is obtained between the wall of the storage container and said collar part. Possibly a sealing ring may be provided between the collar and the wall of the container. If the lid is a flat plate, has no box construction therefore, it will also be possible to use such a sealing ring.
The invention will now be explained with reference to a drawing illustrating two embodiments of a cover according to the invention. In the drawing;

fig 1 is a cross-section of a cover wit a a flat plate;
fig 2 is a side view of a box-shaped cover and
fig 3 is a bottom view of fig 2.

In figure 1 reference numeral 1 indicates a part of the wall of a storage container in which the opening 2 is located. 3 Indicates a cover according to the invention, joining the inner side of the wall 1 at 4. Fixed to said cover part 3 is a pipe 5 which protrudes outwardly. 6 Indicates a bag of plastic material in which the liquid, in particular beer, is to be stored. Connected to said bag 6 is a spout 7 which is provided with a flange 8. The spout 7 has a thickened edge 9 at the side turned outwardly. Said edge fits into the groove which is provided in the pipe 5. The flange 8 is fixed to the bag 6 e.g. by glueing or welding. Because the spout and also the bag are flexible it will be possible, with suitably chosen dimensions of the thickened edge and the groove, to slip the thickened edge into the groove. The inner part 10 of the feed-through pipe has not yet been provided at the place indicated in the drawing then. Said part 10 is only slid into the feed-through pipe from below after the spout and the bag have been placed. The lid 3 is not yet present at the spot indicated in the drawing then, but is completely outside the storage container. This has precisely the advantage that the spout can easily be provided in the groove.
The final closing between the pipe 5 and the spout 7 takes place by means of the inner pipe 10 which is somewhat conical at the end located at the upper side. The pipe 10 is slid into the outer pipe 5 from below and fixed with a follower nut 11 before or after providing the cover in the storage container. Said follower nut 11 is tightened so fast that the closing between the spout 7 and the pipes 5 and 10 is complete. At the bottom side the pipe 10 may now be connected either to a discharge pipe or to a supply pipe for the liquid, in particular the beer. The connection of said pipe may be effected in a manner known, not shown here. 12 Indicates a protrusion pointing inwardly which is provided in the groove of the pipe 5. Said protrusion fits into a recess of the thickened edge 9 and as a result fixes the position of the spout 7 and the bag 6 connected thereto. 13 Indicates an opening in the upper end of the pipe 10 for increasing the through-flow possibility.
Several of such openings may be present. The cover 3 is shaped in such a manner that it can be put into the container through the opening 2, after the bag 6 has been fixed to the pipe 5 via the spout 7. It is e.g. very advantageous to make the opening 2 and also the cover 3 oval. Said oval cover can easily be slid inside then and close the opening 2 after having been rotated.
Fig 2 illustrates an oval cover according to the invention, said cover being box-shaped. At the upper side said box has a protruding collar 14, which will rest on the wall 15 of the storage container.
Except for the opening in which the cover is placed the storage container is entirely surrounded by a thick insulating layer 16, e.g. consisting of polyurethane foam. 17 Indicates a feed-through pipe which runs through the centre of the cover and is not in communication with the space inside the cover. Said pipe 17 corresponds with the pipe 5 of fig 1. Otherwise closing takes place in entirely the same manner as explained with reference to fig 1. 18 Indicates hooks which serve to pull, by means of a bow construction, the cover tightly against the wall 15 at the inside.

Claims

1. Cover (3) for closing an opening (2) in a storage container (1) for a liquid, in particular beer, which liquid is stored in a bag (6), made of plastic material, said bag (6) being located inside the storage container (1), and being provided with a spout (7), which spout (7) has a thickened outer edge (9) whereby a feed-through pipe being received within the spout (7) consists of two coaxial tubular parts (5, 10) fitting into each other, whereby a follower nut (11) is provided for fixing the inner part (10) characterized in that the outer part (5) is fixed to the cover (3), that the inner part (10) has a conical end portion at the side of the bag (6) for clamping the spout (7) between the parts (5, 10), that the outer part (5) in the region of clamping has a groove at its inner side into which fits the thickened outer edge (9) and that the follower nut (11) is tightened so fast that a liquid-tight clamping of the spout (7) between the parts (5, 10) is guaranteed.

2. Cover (3) according to claim 1, characterized in that it is shaped in such a manner that it can be put into the container (1) through the opening (2) and, e.g. by rotating the cover (3), closing of the opening (2) can be effected at the inside of the container (1).

3. Cover (3) according to claims 1 or 2, characterized in that it is oval.

4. Cover (3) according to claims 1, 2 or 3 for closing an opening in a storage container (15) surrounded by an insulating layer (16), characterized in that the cover (3) is a closed box provided with a collar (14) at the side turned to the interior of the container.

5. Cover (3) according to claim one of the claims 1-4, characterized in that there is at least one protrusion (12), pointing inwardly, present in the groove, said protrusion (12) fitting into a recess present in the thickened edge (9) of the spout (7) to the bag.

6. Storage container (1) for a liquid in particular beer, provided with a cover (3) according to any one or more of the preceding claims.