GB2233082A - Liquid carrier - Google Patents

Abstract

A liquid carrier has an inner casing (10) of impermeable material defining a first chamber (11) and an outer casing (12) of permeable material, there being a second chamber (13) defined between the inner (10) and outer (12) casings. In use a potable liquid is carried in the first chamber (11) and another liquid in the second chamber (13) the potable liquid being kept cool by evaporation of the liquid in the second chamber (13) through the outer casing (12). <IMAGE>

Description

WATER CARRIER The present invention relates to devices for the storage of liquids in such a way that they remain relatively cool with respect to ambient temperatures, and in particular with the storage and carriage of potable liquids such as water.

A known type of liquid carrier used for operations in hot hostile environments such as deserts is known as a chagul. A chagul is a bag formed from layers of closely woven cotton. The bag is ventile, and when it is used for the storage and carriage of a liquid such as water there is slow seepage through the bag. Subsequent vaporisation of the liquid from the outside of the bag serves .o cool the liquid remaining therein. To assist in the cooling process chaguls are frequently carried in positions, such as forward of vehicle radiators, where they are exposed to ventilation.

The chagul has a problem in that there is inevitably some loss of liquid in circumstances where supplies of liquid are usually sparse, and indeed the amount of liquid remaining in a chagul after evaporation therefrom may often be undesirably indeterminate.

There is also a problem in that the cotton from which the bag is foamed has to be rot-prsofed, and the chemicals used for rot-proofing frequently contaminate the liquid contained in a chagul. If, as is usually the case, the liquid is carried for drinking purposes it can become unpleasant to drink.

According to the present invention a liquid carrier includes an inner casing of impermeable material defining a first chamber and an outer casing of permeable material, the inner and outer casing defining between them a second chamber.

The impermeable material may advantageously be metalised polythene of the type used by the wine trade for wine boxes, whilst the permeable material might advantageously be closely woven cotton of the type already used for conventional chaguls.

Both inner and outer casings may be rigid, flexible, or one rigid and one flexible, in which last case the outer casing is preferably rigid.

One embodiment of the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings of which, Figure 1 is an elevation, in section along line I-I of Figure 2, and Figure 2 is an end view, in section along line II-II of Figure 1.

A liquid carrier for the carriage of, for example, water has an inner casing formed from an impermeable material such as, for example, metalised polythene, defining a first chamber 11. The inner casing 10 is surrounded by an outer casing 12 of permeable material such as closely woven cotton. The inner casing 10 and outer casing 12 define between them a second chamber 13. A tap 14 connects the first chamber 11 to atmosphere and a tap 15 connects the sec;Dlchamber 13 to atmosphere.

In use liquid, such as water, which it is desired to keep cool is irrtroduced into the first chamber 11 through the tap 14 and cooling liquid, which may also be water, is introduced to the second chamber 13 through the tap 15. The container is preferable stored or carried in a situation whereby it receives some ventilation. Liquid within the second chamber 13 seeps through the outer casing 12 and evaporates therefrom, thereby keeping the contents of the container including, in particular, the contents of the first chamber 11, relatively cool with respect to ambient temperatures.

It will be realised that by selection of a suitable material potable liquid within the second chamber 13 might remain potable.

In normal use of the device, where only the liquid contained within the first chamber is to be used, the second chamber might be filled with liquid, such as contaminated or stagnant water, which would otherwise be unusable. As there is no evaporation (assuming correct design of the tap 14) from the first chamber the contents therein will at all times depend on the amount of liquid originally placed therein and the amount withdrawn therefrom.

The device as described using the materials suggested would normally have the inner casing 10 flexible, and the outer casing 12 rigid. Clearly other suitable materials might be used, in which case both casings might be rigid1 both might be flexible, or in some cases there might even be a rigid inner casing 10 with a flexible outer casing 12.

Claims (10)

1. Claims

   What is claimed is: 1. A liquid carrier including an inner casing of impermeable material defining a first chamber and an outer casing of permeable material, the inner and outer casings defining between them a second chamber.
2. 2. A liquid carrier as claimed in Claim 1 wherein both inner and outer casings are rigid.
3. 3. A liquid carrier as claimed in Claim 1 wherein one casing is rigid and the other is flexible.
4. 4. A liquid carrier as claimed in Claim 3 wherein the outer casing is rigid.
5. 5. A liquid carrier as claimed in Claim 1 wherein the material of the inner casing is metalised polythene.
6. 6. A liquid carrier as claimed in Claim 1 or in Claim 5 wherein the outer casing is closely woven cotton.
7. 7. A liquid carrier substantially as herein described.
8. 8. A liquid carrier substantially as herein described with reference to Figure 1 and 2 of the accompanying drawings.
9. 9. A liquid carrier as claimed in any one of Claims 1 to 8 containing liquid in the first and second chambers.
10. 10. A liquid carrier as claimed in Claim 9 wherein the liquid in both chambers is the same.