US3718149A - Dish-washer - Google Patents

Abstract

In a dish-washing machine of the type having two separate washing zones in which delicate tableware and cooking utensils are respectively charged, there being two detergent dispensers, the second of which is capable of supplying detergent only to the cooking utensil washing zone and is operated as a result of the rise of the washing temperature in the zone for the cooking utensils.

Description

Ute States atet 1191 Mazza 13,71,149 5] Feb. 27, 1973 .........134/93 ......134/93 UX ...134/115 R X DISH-WASHER 1,897,821 2/1933 P011 1447,304 3 1923 H k.. [75] Inventor: Lamberto Mazza,Pordenone,ltaly 217,721 1965 zg I [73] Assignee: lndustrie A. Zanussi S. p. A., F r. 3,253,784 5/1966 Long et Italy FOREIGN PATENTS 0R APPLICATIONS Jan. 22, 1971 21 Appl. No.: 108,898

811,501 4/1969 Canada............................ 1,380,262 10/1964 France 1,500,537 9/1967 France [22] Filed:

[30] Foreign Application Priority Data Primary Examiner-Robert L. Bleutge Feb 4 1970 Attorney-Holman & Stern [57] ABSTRACT In a dish-washing machine of the type having two [52] U.S. Cl....................134/57 D,134/93,134/101,

{51] Int. Separate Washing Zones in which delicate tableware and cooking utensils are re .B08b 3/02 134/93,100,101,115 R, 176,

spectively charged, there [58] Field of Search....

being two detergent dispensers, the second of which is capable of supplying detergent only to the cooking utensil washing zone and is operated as a result of the rise of the washing temperature in the zone for the cooking utensils.

[56] References Cited UNITED STATES PATENTS 3,586,011 6/1971 Mazza D 2 Claims, 2 Drawing Figures PATENTEU m2? 1973 lll llll llll DISH-WASHER BACKGROUND OF THE INVENTION The present invention relates to a dish-washing machine and constitutes an improvement of the dishwashing machine described and claimed in the U.S. Pat. application No. 847,166, now U.S. Pat. No. 3,586,011 issued June 22, 1971, which provides for two separate washing zones in which delicate tableware and cooking utensils are loaded respectively and each of the zones is provided with at least one jet spray, while there are cutoff means capable of cutting off the washing solution supply to the zone containing the delicate tableware. The advantages of this method were fully described in the above mentioned U.S. Pat., to which reference should be made on the subject.

It has now been found and it constitutes the object of this invention that the washing efficiency is considerably increased if the treatment process for cooking utensils such as provides for the use of a more concentrated solution of detergent (with a more intense chemical action) or the use of a very aggressive detergent such as is generally inadvisable for crockery and glassware.

SUMMARY OF THE INVENTION For this purpose, the dish-washing machine according to the present invention, and which is of the type described and illustrated in the U.S. Pat. No. 3,5 86,01 1 is provided with a second detergent dispenser capable of supplying the cooking utensil washing chamber only.

Preferably, such second dispenser is of the thermostatically controlled type, i.e. it is operated as a result of the rise in washing temperature in the zone designed for cooking utensils. In another preferred form of construction, the control operating the second dispenser is effected electrically by the timer-programmer of the dish-washing machine.

In this case, it is advisable and preferable that the control operating the second dispenser, which control is effected by the programmer, should be the same as the one excluding the washing solution from the zone containing the delicate tableware. As indicated above, in the second dispenser, it is possible to load an addition of detergent which is subsequently used to augment the concentration of detergent in the washing solution and, in combination with the higher temperature, it increases the efficacy of the washing action on the cooking utensils.

In another likewise preferred version of the present invention, the second dispenser is designed to feed a chemically more aggressive detergent to the zone containing the cooking utensils.

It is clear that selection of one or the other alternative depends on other factors, mainly the washing temperature in both zones and the increase in temperature in the stage of the cycle in which cooking utensils only are treated.

In this way, although there is only one hydraulic circuit and possibly only one detergent liquid, the same washing programme can perform two different washes, in which not only are the washing temperatures for the delicate tableware and for the cooking utensils, but a difference in the degree of chemical aggressiveness of the washing solution is also engendered.

LII

For the purpose of further illustrating the present invention, a preferred method of implementation thereof will now be described with reference to the attached drawings, it being understood that it has no limiting effect on the sphere of the invention.

BRIEF DESCRIPTION OF THE DRAWING In the attached drawings:

FIG. 1 is a perspective diagrammatic view of the dish-washing machine according to the invention; and

FIG. 2 is a diagrammatic side sectional view of the machine in FIG. 1.

DETAILED DESCRIPTION OF THE DRAWINGS With reference to the drawings and bearing in mind that the dish-washing machine described is of the type illustrated in the U.S. Pat. No. 3,586,011 it comprises a cabinet 600 in the tank being housed a tank 610, the inside of which is divided by means of a or baffle 613 into two zones 611 and 612, respectively designed for washing cooking utensils such as saucepans and delicate tableware such as dishes and glassware. The means of division are of the type illustrated in the U.S. Pat. No. 3,586,011.

On the bottom of the tank 610 is a washing solution collection trap 614, and the drainage thereof through suitable valves, (not illustrated), takes place via a pipe 615 to a circulation and washing pump intake 616, or a pipe 650 to a pump 651 discharging to the outside.

Each zone 611 and 612 is provided with at least one swivelling sprayer, respectively 617 and 618, with each having spray nozzles capable of directing washing solution against the delicate tableware or the utensils loaded in appropriate baskets 652 and 653 housed on slides in the two zones 611 and 612 respectively. The sprayers 617 and 618 are fed through a pipe 619, in which there are means by which at an appropriate moment in the cycle, to cut off the supply of washing solution to the sprayer 618 and hence to the zone 612, in which washing of the delicate tableware takes place.

As shown in FIGS. 1 and 2, for access to the washing tank 610, there is a door 65 1 in which a timer-programmer 655 is mounted, as well as a normal detergent dispensing device 656 and a supplementary detergent dispenser 657 controlled by the timer 655, through an electrical connection 658, and possibly under the control of a thermostat 659.

It is clear in any case that any system of controlling the supplementary detergent dispenser 656 can be used while remaining with the framework of the present invention.

What is claimed is:

1. In a dish-washing machine of the type having a wash chamber subdivided by a bafile into two zones for the loading of delicate tableware and cooking utensils respectively, a first detergent dispensing device, at least one sprayer for each zone, a single wash pump feeding wash solution to each sprayer, and an interception member controlled by means which senses the temperature of the wash solution to exclude the flow of solution heated above a pre-determined temperature to the delicate tableware in the corresponding zone, the improvement comprising a second detergent dispensing device, a means operably connected to the second dispensing device controlling said second gressiveness, destined specifically for washing cooking utensils.

2. The dish-washing machine in accordance with claim 1, in which said controlling means is defined by a timer-programmer and/or by a thermostat.

Claims (2)

1. In a dish-washing machine of the type having a wash chamber subdivided by a baffle into two zones for the loading of delicate tableware and cooking utensils respectively, a first detergent dispensing device, at least one sprayer for each zone, a single wash pump feeding wash solution to each sprayer, and an interception member controlled by means which senses the temperature of the wash solution to exclude the flow of solution heated above a pre-determined temperature to the delicate tableware in the corresponding zone, the improvement comprising a second detergent dispensing device, a means operably connected to the second dispensing device controlling said second dispensing device to feed a detergent agent contained in the second dispensing device to the washing solution in the stage of the washing cycle in which the zone containing delicate tableware is excluded from the action of the washing solution, said second dispenser being loaded with the same detergent as said first dispenser and/or with a detergent having greater chemical aggressiveness, destined specifically for washing cooking utensils.

2. The dish-washing machine in accordance with claim 1, in which said controlling means is defined by a timer-programmer and/or by a thermostat.

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