Filter jug

Details Filter jug Filter jug

1995-02-13

1997-09-09

Cintins, Ivars

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

210282, 210472, 210484, B01D 2708

Patent

active

056652240

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a filter jug of the type which includes a water filter medium and to a container for the filter medium to be used in the jug. Such jugs are filled with water, e.g. from a domestic tap and the water is passed through via the filter medium so as to improve the quality of the water for drinking. The filter medium is typically housed in a moulded canister having perforations for the passage of water therethrough, the canister being received in a suitably shaped chamber. The filter medium needs to be replaced periodiocally and the used filter in its canister must be discarded.
GB-A-606923 discloses a portable filter unit comprising a container of pervious fabric having an upper compartment for the impure water and a lower compartment for the filtered water, the compartments being separated by a filter through which the water flows. GB-A-654012 discloses a filtering device comprising a reservoir for filtered liquid, an inner perforated cage within the reservoir and a removable container of granulated filter medium inside the cage. GB-A-712035 discloses a filtering device in the form of a beaker having a permeable base and a packing of active carbon between two perforated surfaces located near the base. GB-A-2192808 discloses a filter to remove impurities from water to transport live fish. The filter comprises a column with an inlet near the base and an outlet near the top, the column containing arcuate apertured channels containing sausage-like filter bags containing particulate filtration medium. U.S. Pat. No. 4,094,779 discloses a filtration system utilising an inverted upper chamber mounted on a stand above a lower chamber, a filter containing active carbon being disposed between the two filters. U.S. Pat. No. 4,605,499 discloses a filter unit comprising a pouch containing filter medium and means to suspend the pouch in the mouth of the container to receive water.
EP-A-0349315 discloses a filter cartridge for a liquid purifier, comprising a cup like container having a depending baffle. In use liquid passing through the cover flows downwardly inside the baffle, passing through liquid treatment medium with which the cartridge is filled, and then upwardly between the outside of the baffle and the container wall. EP-A-0285908 discloses a container to purify water having a receiving chamber containing a filter cartridge filled with purifying agent, the cartridge having a foil closure that is pierced by a projection in the chamber.
There remains a need for an efficient filter jug that can be easily used and maintained and which includes a filter element which is efficient in use and can be discarded in an environmentally acceptable way.
According to the one aspect of the invention, there is provided a filter jug to contain water or other liquid, the jug comprising a first compartment to receive liquid from a supply, a second compartment to hold filtered liquid to be poured from an outlet of the second compartment and a filter chamber through which liquid must pass from the first compartment to the second compartment, the filter chamber having a removable lid with a projection extending into the chamber and the chamber containing a filter medium, characterised in that the filter medium is present in a flexible bag having a liquid-pervious wall and that the projection of the removable lid of the filter chamber is shaped and dimensioned to extend into the chamber to urge the flexible bag against the walls of the chamber so as to eliminate air gaps through which water could bypass the filter medium in the bag.
Preferably the bag 5A is made of textile or synthetic material throughout so that the bag can be inserted in the chamber in any orientation.
In a preferred feature, the falter chamber includes deformations to engage or support the flexible bag. In a preferred embodiment the chamber includes a removable wall, typically the top, and having a projection extending into the chamber and shaped to urge the flexible bag against the other walls of the chamber so that there are no gaps through whi

REFERENCES:
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patent: 4969996 (1990-11-01), Hankammer
patent: 5002665 (1991-03-01), Brueggermann
patent: 5049272 (1991-09-01), Nieweg
patent: 5186830 (1993-02-01), Rait
patent: 5190643 (1993-03-01), Duncan et al.

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