WO1997024966A2 - Domestic kettle - Google Patents

Domestic kettle Download PDF

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Publication number
WO1997024966A2
WO1997024966A2 PCT/GB1996/003253 GB9603253W WO9724966A2 WO 1997024966 A2 WO1997024966 A2 WO 1997024966A2 GB 9603253 W GB9603253 W GB 9603253W WO 9724966 A2 WO9724966 A2 WO 9724966A2
Authority
WO
WIPO (PCT)
Prior art keywords
kettle
temperature
water
ceramic coating
heating
Prior art date
Application number
PCT/GB1996/003253
Other languages
French (fr)
Other versions
WO1997024966A3 (en
Inventor
William Thomas Large
Stylianos Panaghe
Original Assignee
Delta Theta Limited
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
Priority to GB9600562.4 priority Critical
Priority to GBGB9600562.4A priority patent/GB9600562D0/en
Application filed by Delta Theta Limited filed Critical Delta Theta Limited
Publication of WO1997024966A2 publication Critical patent/WO1997024966A2/en
Publication of WO1997024966A3 publication Critical patent/WO1997024966A3/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/21Water-boiling vessels, e.g. kettles
    • A47J27/21008Water-boiling vessels, e.g. kettles electrically heated
    • A47J27/21058Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water
    • A47J27/21083Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water with variable operating parameters, e.g. temperature or boiling period

Abstract

An electric kettle has settings for boiling (for making tea) and a lower temperature (for making coffee). The kettle may be maintained at temperature by a simmer control. A liquid crystal or other thermochromic substance may be incorporated in a ceramic transfer to give visual indication of temperature.

Description

DOMESTIC KETTLE

This invention relates to domestic kettles.

The primary use for domestic kettles is for boiling water for making tea and coffee. Electric kettles are conventionally provided with a sensor that switches off the element once the kettle has boiled, as well as a safety cut-out to prevent overheating if operated without water. Some kettles have indicator lights telling when switched on. Attainment of boiling temperature is normally indicated by an audible click as the sensor switches off the element, and by the on-off switch button moving to the "off position.

Acting, perhaps, on the principle that a watched kettle never boils, users, having filled and switched on the kettle, tend to turn to other tasks or return to watching television, so that the kettle might have boiled and, having switched off, cooled down before being re-attended for the purpose of making the chosen beverage, necessitating reboiling. In most cases, the switch will not latch on until the kettle has cooled down quite a bit below boiling, requiring manual holding down until boiling temperature is reattained.

Ideally, for tea-making, it is recommended, the water be at boiling point. On the other hand, for French coffee, the water should be just below boiling point when it is poured over the coffee. (Laroussee Gastro nomique, 1988. Paul Hamlyn, publ., pp 1070. 285). With conventional kettles, the water may well have cooled down, since the kettle boiled and switched off. to a temperature suitable for making coffee, yet because there is no way of knowing this, the kettle is reboiled, clearly to a temperature above what is recommended for coffee-making, and may not be allowed to cool back down sufficiently before being poured on to the grounds, or may be let to cool down too far.

The present invention provides an improved kettle that avoids this latter disadvantage and can accommodate optional further improvements.

The invention provides a domestic kettle for heating water comprising a heating element and a temperature sensor with a control arrangement adapted to heat the water only to a given temperature below boiling temperature.

The kettle may be optionally adapted, and will, in fact, usually be adapted, also to heat the water to boiling temperature, so as to be equally suitable for tea or coffee.

Ideally, the kettle is adapted to maintain the water at said given temperature, and, indeed, to maintain it at said given temperature only for a certain time.

The kettle may incorporate a signal device indicating attainment of said given temperature.

In another aspect, the invention comprises a domestic kettle for heating water comprising an external ceramic coating on a substrate kettle shell.

The ceramic coating may comprise a ceramic transfer. Such a coating may comprise a temperature sensitive ingredient that changes colour with temperature. The colour change may indicate boiling point, and may differentiate between boiling point and a slightly lower temperature suitable for making coffee. The ingredient may comprise a thermochromic liquid crystal.

The invention also comprises a domestic kettle for heating water comprising an external ceramic coating on a substrate kettle shell.

The ceramic coating may comprise a ceramic transfer and may comprise a temperature-sensitive ingredient that changes colour with temperature.

The colour change may indicate boiling point, or may differentiate between boiling point and a slightly lower temperature, suitable for making coffee.

The temperature-sensitive ingredient may comprise a thermochromic liquid crystal.

The ceramic coating may comprise nano-particulate ceramic. The coating may also be applied to the heating element.

Embodiments of kettles according to the invention will now be described with reference to the accompanying drawings, in which:-

Figure 1 is a circuit diagram of a first embodiment. Figure 2 is a circuit diagram of a second embodiment, and

Figure 3 is a view of a kettle with a ceramic coating temperature indicator.

The drawings illustrate domestic kettle arrangements for heating water comprising a heating element 11 and a temperature sensor 12 with a control arrangement 13 adapted to heat the water only to a given temperature below boiling temperature.

The kettle arrangements illustrated are also adapted optionally to heat the water to boiling temperature.

The sensor 12 is illustrated as a simple thermostatic switch, but could be any equivalent arrangement such as a platinum resistance thermometer in a bridge circuit with a discriminator to emit a control signal, on the attainment of the given temperature, to switch off the element current.

A simple thermostat switch and, if desired, the equivalent arrangement, will operate also to switch the element current back on when the water temperature falls a degree or so in order to maintain the water temperature at or around a temperature (say, 95 °C) suitable for pouring on to coffee grounds.

To heat the water to boiling temperature, in the embodiment of Figure 1. an additional switch 14 is arranged in parallel with the thermostat 12. The kettle first brings the water up to the given, thermostatically controlled temperature, at which is maintained by the thermostat so that coffee can be made immediately and without further ado. If, however, tea is required, the "boil" or override switch 14 can then be operated. This switch 14 may be a conventional, switch-off-at-boil switch, or may be another, higher-set thermostatic control.

Figure 2 illustrates a pre-select switch 21 which is set on first filling and switching-on the kettle to "C" for coffee or "T" for tea, the thermostats 12, 22 being set to the given temperature and boiling temperature respectively.

In both embodiments, a timer 15 picks up a "current-off ' signal from the element 11 lead and turns off a switch 16.

The two embodiments, as well as other variants, can be realised in simple format in a domestic kettle, which can be provided with a "boil" override switch or a pre¬ select switch as the main overt control for tea or coffee selection.

In addition, an adjustment 17 can be provided for pre-selection of the given temperature setting, say between 90° and 97 °C.

Visual and/or audible signal devices, such for example as light emitting diodes and chimes can be incoφorated.

Figure 3 illustrates a kettle 31 which may include the heating element 11 and sensor 12 as above described but which has a ceramic coating 32 in the form of a ceramic transfer applied to the substrate shell 31a of the kettle 31. The transfer is in the form of a thermometer scale and includes thermochromic liquid crystal material that changes colour up the scale to indicate temperature. "Coffee" and "tea" temperature levels are printed on the kettle or incoφorated into the transfer. If desired, the "coffee" indicator could highlight the word "coffee" and the "tea" indicator the word "tea" at the appropriate temperatures by incoφorating the colour-changing material in or surrounding the lettering of those words.

It is particularly advantageous if the ceramic coating is a selected nano- particulate coating in which desired properties can be "engineered". Such coatings can be made to have non-stick properties so that the kettle can be easily cleaned. Such coatings, again, can themselves have colour without the use of dyes and can change colour with temperature.

Inside the kettle (and this also would apply to kettles without the temperature and external decoration provisions described above) a nano-particulate ceramic coating could be applied to the heating element, and even over the entire inside of the kettle to eliminate build-up of limescale.

Claims

OAIMS
1. A domestic kettle for heating water comprising a heating element and a temperature sensor with a control arrangement adapted to heat the water only to a given temperature below boiling temperature.
2. A kettle according to claim 1 , adapted optionally to heat the water to boiling temperature.
3. A kettle according to claim 1 or claim 2, adapted to maintain the water at said given temperature.
4. A kettle according to claim 3, adapted to maintain the water at said given temperatures only for a certain time.
5. A kettle according to any one of claims 1 to 4, incoφorating a signal device indicating attainment of said given temperature.
6. A domestic kettle for heating water comprising an external ceramic coating on a substrate kettle shell.
7. A kettle according to claim 6, the ceramic coating comprising a ceramic transfer.
8. A kettle according to claim 6 or claim 7, in which the ceramic coating comprises a temperature-sensitive ingredient that changes colour with temperature.
9. A kettle according to claim 8, in which the colour change indicates boiling point.
10. A kettle according to claim 9, in which the colour change differentiates between boiling point and a slightly lower temperature, suitable for making coffee.
11. A kettle according to any one of claim 8 to 10, in which the temperature- sensitive ingredient comprises a thermochromic liquid crystal.
12. A kettle according to any one of claims 6 to 11, in which the ceramic coating comprises nano-particulate ceramic.
13. A kettle according to any preceding claim having a ceramic coating on the heating element.
PCT/GB1996/003253 1996-01-11 1996-12-27 Domestic kettle WO1997024966A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9600562.4 1996-01-11
GBGB9600562.4A GB9600562D0 (en) 1996-01-11 1996-01-11 Domestic kettle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU13844/97A AU1384497A (en) 1996-01-11 1996-12-27 Domestic kettle

Publications (2)

Publication Number Publication Date
WO1997024966A2 true WO1997024966A2 (en) 1997-07-17
WO1997024966A3 WO1997024966A3 (en) 1997-09-12

Family

ID=10786907

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/003253 WO1997024966A2 (en) 1996-01-11 1996-12-27 Domestic kettle

Country Status (3)

Country Link
AU (1) AU1384497A (en)
GB (1) GB9600562D0 (en)
WO (1) WO1997024966A2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2327180A (en) * 1997-07-15 1999-01-20 Andrew Nicholas Graham Electric kettle to selectively heat or boil water
DE19860931A1 (en) * 1998-12-30 2000-07-06 Efbe Elektrogeraete Gmbh Kettle with safety shutdown
EP1632159A1 (en) * 2004-09-01 2006-03-08 BALLARINI PAOLO & FIGLI S.p.A. Cooking vessel with external ornaments
GB2422770A (en) * 2005-02-08 2006-08-09 Chow Hung Electric boiler
DE102005006720A1 (en) * 2005-02-04 2006-08-10 Eldora Gmbh Device for heating a liquid, in particular a kettle
CN104188331A (en) * 2014-09-04 2014-12-10 刘剑卿 Bicycle kettle with liquid level displayer
EP3524304A1 (en) * 2014-11-17 2019-08-14 McNeil AB Electronic nicotine delivery system
US10531692B2 (en) 2014-11-17 2020-01-14 Mcneil Ab Disposable cartridge for use in an electronic nicotine delivery system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135143A (en) * 1983-02-01 1984-08-22 Ti Russell Hobbs Ltd Electric heating appliance
EP0510863A2 (en) * 1991-04-22 1992-10-28 Otter Controls Limited Controls for water heating appliances
GB2282957A (en) * 1993-10-21 1995-04-26 Fast Forward Design Ltd Water boiling device
WO1995019129A1 (en) * 1994-01-13 1995-07-20 Strix Limited Water heating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135143A (en) * 1983-02-01 1984-08-22 Ti Russell Hobbs Ltd Electric heating appliance
EP0510863A2 (en) * 1991-04-22 1992-10-28 Otter Controls Limited Controls for water heating appliances
GB2282957A (en) * 1993-10-21 1995-04-26 Fast Forward Design Ltd Water boiling device
WO1995019129A1 (en) * 1994-01-13 1995-07-20 Strix Limited Water heating apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2327180A (en) * 1997-07-15 1999-01-20 Andrew Nicholas Graham Electric kettle to selectively heat or boil water
DE19860931A1 (en) * 1998-12-30 2000-07-06 Efbe Elektrogeraete Gmbh Kettle with safety shutdown
EP1632159A1 (en) * 2004-09-01 2006-03-08 BALLARINI PAOLO & FIGLI S.p.A. Cooking vessel with external ornaments
DE102005006720A1 (en) * 2005-02-04 2006-08-10 Eldora Gmbh Device for heating a liquid, in particular a kettle
GB2422770A (en) * 2005-02-08 2006-08-09 Chow Hung Electric boiler
CN104188331A (en) * 2014-09-04 2014-12-10 刘剑卿 Bicycle kettle with liquid level displayer
EP3524304A1 (en) * 2014-11-17 2019-08-14 McNeil AB Electronic nicotine delivery system
US10531692B2 (en) 2014-11-17 2020-01-14 Mcneil Ab Disposable cartridge for use in an electronic nicotine delivery system
US10542781B2 (en) 2014-11-17 2020-01-28 Mcneil Ab Electronic nicotine delivery system
US10791768B2 (en) 2014-11-17 2020-10-06 Mcneil Ab Disposable cartridge for use in an electronic nicotine delivery system
US10842199B2 (en) 2014-11-17 2020-11-24 Mcneil Ab Electronic nicotine delivery system

Also Published As

Publication number Publication date
WO1997024966A3 (en) 1997-09-12
GB9600562D0 (en) 1996-03-13
AU1384497A (en) 1997-08-01

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