EP1582136A1 - Dishwasher provided with a hot warning device for the temperature of the dishes - Google Patents

Dishwasher provided with a hot warning device for the temperature of the dishes Download PDF

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Publication number
EP1582136A1
EP1582136A1 EP04101294A EP04101294A EP1582136A1 EP 1582136 A1 EP1582136 A1 EP 1582136A1 EP 04101294 A EP04101294 A EP 04101294A EP 04101294 A EP04101294 A EP 04101294A EP 1582136 A1 EP1582136 A1 EP 1582136A1
Authority
EP
European Patent Office
Prior art keywords
basket
thermochromic pigment
colour
dishwasher
plastic material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04101294A
Other languages
German (de)
French (fr)
Other versions
EP1582136B1 (en
Inventor
Christopher Lynn Dearmitt
Fabio Spizzo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to ES04101294T priority Critical patent/ES2270274T3/en
Priority to EP04101294A priority patent/EP1582136B1/en
Priority to AT04101294T priority patent/ATE335433T1/en
Priority to DE602004001854T priority patent/DE602004001854T2/en
Publication of EP1582136A1 publication Critical patent/EP1582136A1/en
Application granted granted Critical
Publication of EP1582136B1 publication Critical patent/EP1582136B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/50—Racks ; Baskets
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4293—Arrangements for programme selection, e.g. control panels; Indication of the selected programme, programme progress or other parameters of the programme, e.g. by using display panels

Definitions

  • the present invention relates to a dishwasher, particularly of domestic type, comprising a washing tub provided with a door, at least one basket arranged to slide within the tub and provided with a handle, and a rotating arm to spray the dishes supported by said basket, at least one of said internal components being made or embodied by plastic material.
  • thermocouple At the end of the washing and drying process dishes and cutlery can reach rather high temperatures so that it is not comfortable to touch them. The customer should wait some time to allow for cooling. Ideally, it would be possible to add a thermocouple to accurately measure the temperature and to warn the customer when the dishes are to hot to be touched. In practice, this solution is too expensive because it requires also an electronic circuitry accompanying the thermocouple.
  • the purpose of the present invention is to provide a dishwasher with a hot warning device which is simple, effective and cheap.
  • hot warning device it is intended a means that gives an information to the user about the high temperature of the pieces contained into the washing tub of the machine.
  • thermochromic pigments which are special pigments that change colour when heated.
  • thermochromic pigment the purpose is achieved by a dishwasher wherein at least one of its internal components is made of plastic material to which a thermochromic pigment has been added, as described in the appended claims.
  • a dishwasher particularly of domestic type, normally comprises a washing tub provided with a door, adapted to close the aperture through which dishes and cutlery are charged in the tub. At least one basket is arranged to slide on support guides within the tub and a rotating arm is provided to spray the dishes supported by said basket.
  • the basket is normally made by metallic wire coated by plastic material and it may be provided with a peripheral frame applied or over injected on the superior edge of the basket.
  • the basket is provided with a handle to facilitate the handling of the same.
  • thermochromic pigment it is proposed to manufacture at least one of said internal components by plastic material to which a thermochromic pigment has been added.
  • the best technical solution is accomplished by manufacturing in the mentioned way a single piece that is easy to be moulded and already present as normal component in the machine. Therefore, the handle of the basket is a very suitable component to be manufactured in a plastic material added with a thermochromic pigment.
  • Figure 1 represents a handle 1 of a dishwashing machine made in plastic material, part of which is made by inserting a thermochromic component 2.
  • thermochromic component may be applied in various different ways known to the man skilled in the art, e.g. by using a thermochromic pigment.
  • Figure 2 represents again a handle 1 of a dishwashing machine made in plastic material similar to that of Figure 1. However, the handle of Figure 2 is made by a transparent material and the thermochromic component 2 is fully extended inside the handle body.
  • FIG 3 represents in a partial perspective view a basket 3 for a dishwashing machine, which is designed to support dishes in vertical place to be sprayed by water jets.
  • the basket 3 is arranged to slide on lateral guides fixed on the internal walls of a washing chamber, as it is well known in the technical field. No further specification or references are needed.
  • the basket 3 is provided with a handle 1 which is similar to that shown in Figure 1 or Figure 2, i.e. made at least partially by inserting a thermochromic component.
  • thermochromic component may be applied to the basket for cutlery or directly to the basket supporting dishes.
  • thermochromic component In all cases, at room temperature the thermochromic component is one colour (any colour may be used) and when heated above a certain temperature the thermochromic pigment loses its colour. This colour change indicates to the customer that the dishes are too hot to be touched. As the handle and dishes cool, the colour of the thermochromic component returns to the original colour to signal that it is now safe to unload the dishwasher.
  • the colour change cycle is indefinitely repeatable.
  • Red is a colour associated with fire and heat, so the pigment formulation needs to be conveniently modified. This is done by using two different pigments.
  • One is an ordinary non-thermochromic pigment, for example pink.
  • the second pigment is thermochromic, for example blue. At room temperature both red and blue pigments are visible and give the colour purple. As they are heated about a certain temperature (e.g. 45°C) the ordinary pigment remains pink and the thermochromic loses its colour. Therefore, the handle becomes pink.
  • thermochromic pigment colour and the thermochromic pigment colour can be chosen freely.
  • the temperature at which the thermochromic pigment loses its colour can be chosen by selecting from a wide range of commercially available colours.
  • the handle is made of polypropylene, but the polymer can also be changed as requested.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Table Devices Or Equipment (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

Dishwasher, particularly of domestic type, provided with at least one internal component (1) made by plastic material and provided with at least a part added with at least a thermochromic pigment (2), so as it changes its colour when a high temperature occurs inside the machine.
The internal component is preferably the handle of the basket which supports dishes or the like.

Description

  • The present invention relates to a dishwasher, particularly of domestic type, comprising a washing tub provided with a door, at least one basket arranged to slide within the tub and provided with a handle, and a rotating arm to spray the dishes supported by said basket, at least one of said internal components being made or embodied by plastic material.
  • At the end of the washing and drying process dishes and cutlery can reach rather high temperatures so that it is not comfortable to touch them. The customer should wait some time to allow for cooling. Ideally, it would be possible to add a thermocouple to accurately measure the temperature and to warn the customer when the dishes are to hot to be touched. In practice, this solution is too expensive because it requires also an electronic circuitry accompanying the thermocouple.
  • The purpose of the present invention is to provide a dishwasher with a hot warning device which is simple, effective and cheap. With the definition "hot warning device" it is intended a means that gives an information to the user about the high temperature of the pieces contained into the washing tub of the machine.
  • There are known thermochromic pigments which are special pigments that change colour when heated. There are two basic types of such pigments, based on either Leuco dyes or liquid crystals. Said thermochromic pigments are used as an inexpensive way to indicate temperature changes in consumer products like baby bottles, beer bottles and various toys.
  • Therefore, according the present invention, the purpose is achieved by a dishwasher wherein at least one of its internal components is made of plastic material to which a thermochromic pigment has been added, as described in the appended claims.
  • The invention will be better appreciated from the following description given solely by way of non-limiting example.
  • A dishwasher, particularly of domestic type, normally comprises a washing tub provided with a door, adapted to close the aperture through which dishes and cutlery are charged in the tub. At least one basket is arranged to slide on support guides within the tub and a rotating arm is provided to spray the dishes supported by said basket.
  • Plastic materials are more and more largely used in manufacturing dishwashers, particularly their internal components. For instance, the basket is normally made by metallic wire coated by plastic material and it may be provided with a peripheral frame applied or over injected on the superior edge of the basket. Preferably, the basket is provided with a handle to facilitate the handling of the same.
  • Therefore, according to the present invention it is proposed to manufacture at least one of said internal components by plastic material to which a thermochromic pigment has been added. The best technical solution is accomplished by manufacturing in the mentioned way a single piece that is easy to be moulded and already present as normal component in the machine. Therefore, the handle of the basket is a very suitable component to be manufactured in a plastic material added with a thermochromic pigment.
  • The scope of the invention is pointed out in the claims which are appended to this patent.
  • Features and advantages of the present invention will be better understood from the following description, given only by way of non-limiting example, with reference to the accompanying drawings, in which:
    • Figure 1 shows a perspective view of a part of a dishwashing machine according with a first embodiment of the invention; and
    • Figure 2 shows a front view of a part of a dishwashing machine similar to that of Figure 1 according with a second embodiment of the invention.
    • Figure 3 shows a partial perspective view of a basket for a dishwasher provided with a device according to the present invention.
  • Figure 1 represents a handle 1 of a dishwashing machine made in plastic material, part of which is made by inserting a thermochromic component 2. Alternatively, said thermochromic component may be applied in various different ways known to the man skilled in the art, e.g. by using a thermochromic pigment.
  • Figure 2 represents again a handle 1 of a dishwashing machine made in plastic material similar to that of Figure 1. However, the handle of Figure 2 is made by a transparent material and the thermochromic component 2 is fully extended inside the handle body.
  • Figure 3 represents in a partial perspective view a basket 3 for a dishwashing machine, which is designed to support dishes in vertical place to be sprayed by water jets. The basket 3 is arranged to slide on lateral guides fixed on the internal walls of a washing chamber, as it is well known in the technical field. No further specification or references are needed. The basket 3 is provided with a handle 1 which is similar to that shown in Figure 1 or Figure 2, i.e. made at least partially by inserting a thermochromic component.
  • It is apparent that, alternatively to the handle, any other part of an internal component of the machine could be easily provided with such a device. For instance, the thermochromic component may be applied to the basket for cutlery or directly to the basket supporting dishes.
  • In all cases, at room temperature the thermochromic component is one colour (any colour may be used) and when heated above a certain temperature the thermochromic pigment loses its colour. This colour change indicates to the customer that the dishes are too hot to be touched. As the handle and dishes cool, the colour of the thermochromic component returns to the original colour to signal that it is now safe to unload the dishwasher. The colour change cycle is indefinitely repeatable.
  • In practice, a colourless handle is not a very effective warning. A more effective warning colour should be used.
  • Red is a colour associated with fire and heat, so the pigment formulation needs to be conveniently modified. This is done by using two different pigments. One is an ordinary non-thermochromic pigment, for example pink. The second pigment is thermochromic, for example blue. At room temperature both red and blue pigments are visible and give the colour purple. As they are heated about a certain temperature (e.g. 45°C) the ordinary pigment remains pink and the thermochromic loses its colour. Therefore, the handle becomes pink.
  • Of course, the non-thermochromic pigment colour and the thermochromic pigment colour can be chosen freely. The temperature at which the thermochromic pigment loses its colour can be chosen by selecting from a wide range of commercially available colours. According the present invention, the handle is made of polypropylene, but the polymer can also be changed as requested.
  • It is apparent that, above the already mentioned advantages, the proposed solution gives an immediately intuitive warning to the customer, who does not need of specific instructions.

Claims (5)

  1. Dishwasher, particularly of domestic type, comprising a washing tub provided with a door, at least one basket (3) arranged to slide within the tub and provided with a handle (1), and a rotating arm to spray the dishes supported by said basket, at least part of one of said internal components (1, 3) being made or embodied by plastic material, the dishwasher being characterised in that the plastic material of said at least one internal component (1, 3) is added with at least a thermochromic pigment (2), so as it changes its colour when a high temperature occurs in the tub.
  2. Dishwasher according to claim 1, characterised in that the internal component made by plastic material added with thermochromic pigment (2) is the handle (1) of the basket (3).
  3. Dishwasher according to claim 1 or 2, characterised in that the thermochromic pigment is a Leuco dye.
  4. Dishwasher according to claim 1 or 2, characterised in that the thermochromic pigment is a liquid crystal.
  5. Dishwasher according to any of the preceding claims, characterised in that the plastic material of the internal component (1, 3) is added with at least two different pigments, at least an ordinary non-thermochromic pigment and a thermochromic pigment, so as a more effective change of colour of the component may occur.
EP04101294A 2004-03-29 2004-03-29 Dishwasher provided with a hot warning device for the temperature of the dishes Expired - Lifetime EP1582136B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES04101294T ES2270274T3 (en) 2004-03-29 2004-03-29 DISHWASHER PROVIDED WITH A WARNING TEMPERATURE DEVICE DEVICE.
EP04101294A EP1582136B1 (en) 2004-03-29 2004-03-29 Dishwasher provided with a hot warning device for the temperature of the dishes
AT04101294T ATE335433T1 (en) 2004-03-29 2004-03-29 DISHWASHER WITH WARNING INDICATOR FOR DISHES THAT ARE TOO HOT
DE602004001854T DE602004001854T2 (en) 2004-03-29 2004-03-29 Dishwasher with warning indication of hot dishes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04101294A EP1582136B1 (en) 2004-03-29 2004-03-29 Dishwasher provided with a hot warning device for the temperature of the dishes

Publications (2)

Publication Number Publication Date
EP1582136A1 true EP1582136A1 (en) 2005-10-05
EP1582136B1 EP1582136B1 (en) 2006-08-09

Family

ID=34878299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04101294A Expired - Lifetime EP1582136B1 (en) 2004-03-29 2004-03-29 Dishwasher provided with a hot warning device for the temperature of the dishes

Country Status (4)

Country Link
EP (1) EP1582136B1 (en)
AT (1) ATE335433T1 (en)
DE (1) DE602004001854T2 (en)
ES (1) ES2270274T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020691A1 (en) * 2005-03-14 2006-09-21 Hansa Metallwerke Ag Sanitary outlet fitting
EP1882439A1 (en) * 2006-07-25 2008-01-30 Electrolux Home Products Corporation N.V. Pull-out basket-type dishwasher and basket therefor
WO2008137518A3 (en) * 2007-05-04 2009-02-12 Electrolux Home Prod Inc Rack handle member for a dishwasher
US20110248609A1 (en) * 2010-04-07 2011-10-13 Bsh Bosch Und Siemens Hausgerate Gmbh Dishwasher with a visual display facility

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11225747B2 (en) 2019-02-12 2022-01-18 Whirlpool Corporation Appliance and coating for same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245548A (en) * 1964-03-12 1966-04-12 Green Valley Products Inc Commercial dish washer rack
JPH10328116A (en) * 1997-06-03 1998-12-15 Mitsubishi Electric Corp Tableware baskets such as tableware dryers
JP2002017647A (en) * 2000-07-12 2002-01-22 Matsushita Electric Ind Co Ltd Dishwasher dish basket
EP1306046A1 (en) * 2001-10-29 2003-05-02 Electrolux Home Products Corporation N.V. Rack for dishwashing machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245548A (en) * 1964-03-12 1966-04-12 Green Valley Products Inc Commercial dish washer rack
JPH10328116A (en) * 1997-06-03 1998-12-15 Mitsubishi Electric Corp Tableware baskets such as tableware dryers
JP2002017647A (en) * 2000-07-12 2002-01-22 Matsushita Electric Ind Co Ltd Dishwasher dish basket
EP1306046A1 (en) * 2001-10-29 2003-05-02 Electrolux Home Products Corporation N.V. Rack for dishwashing machines

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 03 31 March 1999 (1999-03-31) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 05 3 May 2002 (2002-05-03) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020691A1 (en) * 2005-03-14 2006-09-21 Hansa Metallwerke Ag Sanitary outlet fitting
EP1882439A1 (en) * 2006-07-25 2008-01-30 Electrolux Home Products Corporation N.V. Pull-out basket-type dishwasher and basket therefor
WO2008137518A3 (en) * 2007-05-04 2009-02-12 Electrolux Home Prod Inc Rack handle member for a dishwasher
US8303725B2 (en) 2007-05-04 2012-11-06 Electrolux Home Products, Inc. Rack handle member for a dishwasher
RU2467676C2 (en) * 2007-05-04 2012-11-27 Электролюкс Хоум Продактс, Инк. Handle of plate-rack in dishwasher
CN101686795B (en) * 2007-05-04 2013-09-11 伊莱克斯家用产品公司 Rack handle member for a dishwasher
US20110248609A1 (en) * 2010-04-07 2011-10-13 Bsh Bosch Und Siemens Hausgerate Gmbh Dishwasher with a visual display facility
US8858726B2 (en) * 2010-04-07 2014-10-14 Bsh Bosch Und Siemens Hausgeraete Gmbh Dishwasher with a visual display facility
EP2374398A3 (en) * 2010-04-07 2016-08-03 BSH Hausgeräte GmbH Dishwasher with an optical display device

Also Published As

Publication number Publication date
DE602004001854D1 (en) 2006-09-21
EP1582136B1 (en) 2006-08-09
ATE335433T1 (en) 2006-09-15
DE602004001854T2 (en) 2007-01-18
ES2270274T3 (en) 2007-04-01

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