Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B1/00—Details of electric heating devices
  • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
  • H05B1/0227—Applications
  • H05B1/0252—Domestic applications
  • H05B1/0258—For cooking
  • H05B1/0269—For heating of fluids
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J27/00—Cooking-vessels
  • A47J27/21—Water-boiling vessels, e.g. kettles
  • A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
  • A47J27/21041—Water-boiling vessels, e.g. kettles electrically heated with heating elements arranged outside the water vessel
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J27/00—Cooking-vessels
  • A47J27/21—Water-boiling vessels, e.g. kettles
  • A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
  • A47J27/21058—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water
  • A47J27/21066—Details concerning the mounting thereof in or on the water boiling vessel
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/78—Heating arrangements specially adapted for immersion heating
  • H05B3/82—Fixedly-mounted immersion heaters
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
  • H01H2300/02—Application transmission, e.g. for sensing the position of a gear selector or automatic transmission
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H37/00—Thermally-actuated switches
  • H01H37/02—Details
  • H01H37/04—Bases; Housings; Mountings
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
  • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

• This invention concerns improvements relating to electrically heated water boiling vessels such as electric kettles and hot water jugs for example.
• Electric kettles and hot water jugs and the like have conventionally incorporated electric immersion heating elements in the form of a wire wound, mineral insulated, metal sheathed heating element proper affixed to an element head plate serving for the attachment of the heating element to the vessel with the heating element proper within the vessel; such a conventional immersion
• heating element is described for example in GB-A-2222025. Another
• heating element not an immersion heating element
• resistance heating element in the form of a printed or otherwise formed
• the substrate might for example comprise a thin sheet of stainless steel on one side of which there is formed an electrically insulating dielectric layer, of glass or ceramics for example, and the resistance heating element might be formed on the dielectric layer with another protective electrically insulating dielectric layer, also of glass or ceramics for example, formed on top of the resistance heating element.
• Element protector controls have commonly comprised one or more bimetallic elements arranged in close heat transfer relationship with the heating element and arranged to
• protector control is the X-type control manufactured and marketed by us which is described in GB-A-2194099 with reference particularly to Figures 3 A,
• Steam sensors have commonly comprised a bimetallic or other thermally sensitive element, a shape memory effect (SME)
• an exemplary steam sensor is the J-type steam sensor manufactured and marketed by us which is described in GB-A-2212664.
• GB-A-2222025 aforementioned and WO-A-95/34187 both describe arrangements in which an element protector control and a steam sensor are mounted in the base of a water boiling vessel and a steam pipe is provided in the vessel for conveying steam from the upper part of the vessel to the location of the steam sensor in the base of the vessel.
• a steam pipe is provided in the vessel for conveying steam from the upper part of the vessel to the location of the steam sensor in the base of the vessel.
• A-95/34187 exhibit poor segregation between the steam control and the
• both the element protector control and the steam sensor are arranged to be juxtaposed with an electrical heating element of the aforementioned thick film type with
• the electrical power supply may be supplied to electrical terminals of the element protector
• contact pads to which the spring contacts of the steam sensor for example in appropriately modified J-type of steam sensor, may be directly connected.
• the present invention enables virtually any configuration to be accommodated with very little cost since all that requires to be changed is the layout of the printed element track which requires no more than the printing of the track to be changed.
• the operation of the steam sensor could be arranged to initiate the
• a simmer control arranged to switch the heating element on and off in cyclical fashion so as to maintain the contents of the vessel at a set
• the vessel itself might have a manually
• the mountings of the element protector control and the steam sensor to the heating element are preferably compartmentalised to avoid the wet environment of the steam sensor adversely affecting the element protector control.
• this segregation of the element protector control and the steam sensor is achieved by provision of a carrier member having spaced-apart and segregated compartments for receiving an X-type element protector control and a J-type steam sensor.
• the carrier member has provision
• the carrier member is formed to accommodate the female
• the present invention in another aspect, extends also to a thick film
• type of electric heating element having a plurality of sets of contact pads formed in the printed circuit track thereof for accommodating the direct electrical connection thereto of two or more of the following, namely an element protector control, a simmer control, a steam sensor, an on/off switch and an indicator or indicators.
• Figure 1 is a perspective view showing an X-type element protector control, a J-type steam sensor and a CP7 cordless connector inlet mounted in a
• Figure 2 A is an underplan view of the arrangement of Figure 1
• Figure 2B is a side elevation view of the arrangement of Figure 2 A;
• Figure 2C is a perspective view illustrating how the arrangement of
• Figure 1 mounts to the underside of the heating element;
• Figure 2D is the same as Figure 2C but with the heating element
• Figure 2E is a perspective view of the Figure 1 arrangement taken from one side thereof.
• Figures 3 A and 3B are plan views of the printed circuit track of a thick film printed heating element having provision for the direct connection thereto of an element protector control and a steam sensor.
• a moulded plastics carrier member 1 has separate compartments 2, 3 and 4 for receiving, respectively, an X-type element protector control 5 as described in GB-A-2308921, a CS7 cordless connector inlet 6 substantially as described in GB-A-2285716 and a J-type steam sensor 7 substantially as described in GB-A-2212664. Since the element protector control 5, the connector inlet 6 and the steam sensor 7 are all current products
• the three compartments 2, 3 and 4 are designed to receive their respective components 5, 6 and 7 in snap-fit manner and to retain these components separate from each other.
• the steam sensor 7 is well spaced apart from the compartment 2 for the
• the element protector control 5 includes a bimetallic element 8 which is mounted in a plastics material carrier 9.
• the bimetallic element 8 is arranged to be juxtaposed with the surface of a heating element in close thermal contact therewith and is set to operate in the event that the heating element
• the carrier 9 is arranged to provide a secondary level of protection which is operable in the event of failure of the bimetallic element 8 to operate effectively, the material of the carrier 9 being selected to soften at a temperature in excess of the normal operating temperature of the bimetallic element 8 so that the carrier deforms under spring pressure from within the control and allows a set of switch contacts, separate from those which are arranged to be operated by the bimetallic element 8, to open.
• the element protector control 5 serves to determine the
• springs 10 are provided for making direct electrical contact with terminal pads
• the appliance inlet connector 6 is directly coupled electrically with the element protector control 5 for supplying electricity thereto and is of a kind
• the steam sensor 7 is, again, a current product of Otter Controls Limited.
• a bimetallic element 1 1 is mounted between a trip lever 12 and a resilient mounting 13 and, depending on the condition of the bimetallic element
• the switch contacts are coupled to a pair of contact springs 15 designed to make direct electrical contact with terminal pads of a heating element.
• FIGS. 2A to 2C show various views of the arrangement of Figure 1 juxtaposed with an exemplary circular disc type heating element 20, and Figures 2D and 2E show additional views of the Figure 1 arrangement.
• a cover plate 17 is designed to be fitted into the carrier member 1 which has apertures 18 and 19 respectively for the admission of steam to the bimetallic element 1 1 of the steam sensor 7 and for ensuring venting of steam from the steam sensor compartment 4.
• Figures 3A and 3B show an exemplary printed circuit track in
• the heating element 20 has a
• convoluted track 30 defining a first pair of terminal pads 31 for being contacted by the spring contacts 10 of an element protector control 5 such as
• the portion 33 of the printed element track 30 between the terminal pads 31 and the terminal pads 32 may be resistive to add to the power of the heating element or may be of an electrically conductive material so as simply to constitute a circuit link. This part of the track could even be of a different
• the shaded area 33 shown in Figure 3 A illustrates the area of the heating element which co-operates with the bimetallic element 8 of the element
• an opening may be provided in the insulative covering of the heating element in
• the carrier 9 of the element protector control 5 can be
• Mounting points 34 such as weld points or mounting posts, can be any suitable mounting points 34.
• the base part of the appliance could for example include a cam feature designed to interact with the trip lever of the steam sensor.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Cookers (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=10819661

Family Applications (1)

Country Status (5)

Families Citing this family (6)

Family Cites Families (15)

• 1997
  • 1997-09-25 GB GB9720458A patent/GB2329759B/en not_active Expired - Fee Related
  • 1997-09-25 GB GB9909190A patent/GB2333901B/en not_active Expired - Fee Related
• 1998
  • 1998-09-25 AU AU91774/98A patent/AU9177498A/en not_active Abandoned
  • 1998-09-25 CN CN 98811372 patent/CN1279593A/zh active Pending
  • 1998-09-25 EP EP98944108A patent/EP1017300A1/de not_active Ceased
  • 1998-09-25 WO PCT/GB1998/002892 patent/WO1999015057A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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