Cleaning and liquid contact with solids – Apparatus – Automatic controls
Patent
1992-06-29
1995-03-14
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
Automatic controls
134 93, 134 941, 68 17R, 68207, 222207, 1375645, 1372055, B08B 302
Patent
active
053969146
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention relates to apparatus for dispensing liquids. It is particularly applicable for example in admitting of detergent into dishwashers.
In some appliances such as domestic dishwashing machines, it is usual for the user to place the detergent in granulated form in a mechanical dispenser which is mounted on the door of the dishwasher. The detergent is a highly reactive substance and there exists a need for improving the dispensing of the detergent into the machine. In particular it is desirable that a bulk dispenser can be used which will minimize the exposure of the user to the detergent. The dispenser should also dispense the correct quantity of detergent into the machine when required. Dishwashing detergent can be made in liquid form but it tends to be subject to separation or breaking down when exposed to air or excessive temperatures.
The object of the present invention is to provide a dispensing apparatus which can simply and effectively dispense liquid agents in an appliance.
It is also an object to provide a novel container for detergent.
SUMMARY
According to the present invention there is provided apparatus for dispensing a first liquid in an appliance which includes a pump for pumping a second liquid therein, said apparatus including first means for receiving a container of said first liquid, said container including an outlet, said first means being such that at least part of the container is subjected to the second liquid under pressure from said pump, second means for establishing a fluid communication path from the container outlet to a dispensing point or zone and control means operative to open and close said path to thereby control the time for which the container is, in use, subjected to the pressure of said second liquid and therefore to control the volume of said first liquid expelled through the outlet.
In one arrangement, the container comprises a collapsible bag containing said first liquid, the external surface of the bag is subjected, in use, to the pressure of said second liquid.
In another form the container includes a cylinder and piston slidably movable therein, the piston being subjected, in use, to the pressure of the second liquid.
When the appliance comprises a dishwasher or clothes washer the first liquid comprises detergent and the second liquid comprises water.
The invention also provides a container for dishwashing detergent, said container comprising a flexible bag and an outlet nozzle.
The invention also provides a container for dishwashing detergent, said container comprising a cylinder and piston slidably movable therein, and an outlet in the cylinder for discharging detergent when the piston moves under pressure of a fluid applied thereto.
DESCRIPTION OF THE DRAWINGS
The invention will now be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of part of a dishwashing apparatus incorporating a dispenser of the invention;
FIG. 2 is a schematic view of a modified arrangement;
FIG. 3 is a more detailed schematic view of the dispenser;
FIG. 4 is a schematic view of a container;
FIG. 5 shows a modified dispenser of the invention;
FIG. 6 is a further modified dispenser of the invention;
FIG. 7 is a schematic view of a still further modified arrangement of the invention; and
FIG. 8 shows a further modification of the invention.
FIG. 1 schematically illustrates a dishwasher having a bowl 4 and pump 6 which supplies water under pressure to a rotating spray arm 8, in the usual way. The dishwasher includes a dispensing apparatus 10 in accordance with the invention. The dispensing apparatus is arranged to dispense at appropriate times liquid detergent concentrate into the bowl 4 of the dishwasher.
FIG. 3 illustrates in more detail the dispenser 10 of the invention, it comprises a hollow cylindrical body 11 which is provided with means (not shown) for being mounted in the bowl 4 of the dishwasher in a leak proof manner. The upper end of the body 11 is threaded so as to receive a cap 12. The body 11
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Stinson Frankie L.
Vulcan Australia Limited
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