WO1996012387A1 - Electric hob - Google Patents
Electric hob Download PDFInfo
- Publication number
- WO1996012387A1 WO1996012387A1 PCT/GB1995/002300 GB9502300W WO9612387A1 WO 1996012387 A1 WO1996012387 A1 WO 1996012387A1 GB 9502300 W GB9502300 W GB 9502300W WO 9612387 A1 WO9612387 A1 WO 9612387A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hob
- ceramic glass
- disc
- glass disc
- hot plate
- Prior art date
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 28
- 239000011521 glass Substances 0.000 claims abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229920002379 silicone rubber Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910000502 Li-aluminosilicate Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- -1 tungsten halogen Chemical class 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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
- H05B3/00—Ohmic-resistance heating
- H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
- H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/06—Arrangement or mounting of electric heating elements
- F24C7/067—Arrangement or mounting of electric heating elements on ranges
Definitions
- This invention relates to electric hobs.
- the invention provides an electric hob comprising a hob surface, a ceramic glass disc extending across an opening in the hob surface with a peripheral region of the ceramic
- Figure 1 is a plan view of the underside of the hob
- Figure 2 is an axial section (indicated by lines A-A in Figure 1) through one of the hot
- Figure 2a shows a fragmentary view of a hob plate with an alternative form of ceramic
- the hob comprises a metal pressing 1 forming a hob surface and hot plate units 2 to 5.
- the hot plate units 2 and 5 are of a smaller size than the hot plate units 3 and 4.
- Louvres 6 permit ventilation of the region beneath the hob, and the controls for the hot plates are positioned in the region 7 but on the top surface of the hob.
- the louvres may be omitted, and the controls may be provided on a separate control panel.
- the hot plate units 2 to 5 are secured to the hob surface 1 by means of support straps 8
- each heater consists of a heater element (not shown) supported on
- the heating element may be a coiled wire heating element as disclosed, for example, in
- GB-A-2 138 935 or 2 177 578 Such an element may be used on its own, or may be
- the lower surface of the ceramic glass disc is provided with a number of location points
- FIG. 2a An alternative form of ceramic glass disc 4c is shown in Figure 2a, in which the circumference of the disc is provided with a number of location ridges 4d which locate the disc with the respective openings in the hob pressing 1.
- the spacer ring 12 and the other parts of the hob would however remain the same.
- the respective ceramic glass discs 4a, 4c have a peripheral flange 4b which is overlapped by the rim 13 of the respective opening in the hob pressing 1. This permits the hot plate
- a sealant for example an extruded foam silicon rubber 14.
- Pairs of hot plate units 2, 3 and 4, 5 are together secured in position by respective support
- the hot plate units are resiliently urged
- the hot plate units are additionally located by means of locater screws (or pins) 17 surrounded by ferrules 17a at each end (only that for the left hand end being shown)
- All the hot plate units are of similar construction, similar to the hot plate unit 4 shown in
- the hob pressing 1 has a circular drip region 18 surrounding each of the hot plate
- the assembly is as follows.
- an adhesive strip in the form of a ring, is placed around the periphery of the ceramic disc 4a or 4c.
- the disc and seal assembly is then positioned into the respective opening in hob pressing 1.
- the location ridges 4b on the disc centralise the assembly in the opening in the hob pressing.
- Location pins or screws 17 surrounded by ferrules 17a are secured into pre-formed apertures of canister 11 so as to project from the canister.
- Canister assembly 1 1 consisting of pre-assembled base 10, support ring 12 and location pins or screws 17 with ferrules is centralised onto the underside of disc 4a, 4c with
- the canister assembly is rotated about its axis until the ferrules surrounding the locater pins or screws align with apertures in the support strap 9 which have the metal
- the construction has a number of advantages. Firstly, the assembly can be carried out
- Suitable materials for the ceramic material are micro-porous fumed silica mixed with
- Ceramic or glass fibre and titanium zircon or other suitable oxide for binding; and for the ceramic glass disc are lithium aluminium silicate or magnesium aluminium silicate, with titania or phosphate added to the basic material as a nucleating agent to initiate the formation of the crystals, which are then grown by treating with controlled heat.
- Such ceramic glass has low thermal expansion, giving good resistance to thermal shock.
- underside of the discs 4a, 4c together with the recesses in the ring 12 are optional. Further,
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
In an electric hob, the ceramic glass disc (4a) of each hot plate unit has a peripheral region (4b) which is overlapped by the rim of the respective opening in the hob surface (1), and the hot plate unit is resiliently urged towards the hob surface. This facilitates assembly, while providing some protection for the ceramic disc from shock loads.
Description
ELECTRIC HOB
This invention relates to electric hobs.
A popular design of electric hob utilises cast iron hot plates set into a hob pressing. Whilst
for cosmetic reasons and for ease of cleaning, hob surfaces composed entirely of ceramic
glass have been introduced, the use of ceramic glass disc-shaped inserts has now been
proposed for use with metal hob pressings in place of the cast iron hot plate units
(GB-A--2 138 935 and 2 177 578).
The invention provides an electric hob comprising a hob surface, a ceramic glass disc extending across an opening in the hob surface with a peripheral region of the ceramic
glass disc lying beneath the rim of the opening, a heater positioned beneath the ceramic glass disc, and resilient means arranged so that the ceramic glass disc is resiliently urged towards the rim of the hob surface.
Because the rim of the opening in the hob overlaps the ceramic glass disc, it is possible to assemble the hob entirely from the underside of the hob surface, making the assembly
process easier. Any shock loading on the ceramic glass e.g. due to a pan being dropped,
is at least partly taken up by the resilient means, reducing the chances of accidental damage
to the ceramic glass disc.
An electric hob constructed in accordance with the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a plan view of the underside of the hob;
Figure 2 is an axial section (indicated by lines A-A in Figure 1) through one of the hot
plates of the hob of Figure 1, but to a larger scale; and
Figure 2a shows a fragmentary view of a hob plate with an alternative form of ceramic
glass disc.
Like parts are given like reference numerals throughout the Figures.
Referring to Figure 1, the hob comprises a metal pressing 1 forming a hob surface and hot plate units 2 to 5. The hot plate units 2 and 5 are of a smaller size than the hot plate units 3 and 4. Louvres 6 permit ventilation of the region beneath the hob, and the controls for the hot plates are positioned in the region 7 but on the top surface of the hob.
Alternatively, the louvres may be omitted, and the controls may be provided on a separate control panel.
The hot plate units 2 to 5 are secured to the hob surface 1 by means of support straps 8
and 9.
Referring to Figure 2, each heater consists of a heater element (not shown) supported on
a base 10 of thermally and electrically insulating (e.g. ceramic) material which is contained
in a metal canister 1 1 and is surrounded by a spacer ring 12 of thermally and electrically insulating material, on which the respective ceramic glass disc 4a is supported. The
heating element may be a coiled wire heating element as disclosed, for example, in
GB-A-2 138 935 or 2 177 578. Such an element may be used on its own, or may be
supplemented by one or more tungsten halogen lamps.
The lower surface of the ceramic glass disc is provided with a number of location points
(not shown) which fit in corresponding depressions in the support ring 12.
An alternative form of ceramic glass disc 4c is shown in Figure 2a, in which the circumference of the disc is provided with a number of location ridges 4d which locate the disc with the respective openings in the hob pressing 1. The spacer ring 12 and the other parts of the hob would however remain the same.
The respective ceramic glass discs 4a, 4c have a peripheral flange 4b which is overlapped by the rim 13 of the respective opening in the hob pressing 1. This permits the hot plate
unit to be assembled from underneath the hob pressing. The space between the flange 4b and the rim 13 is filled with a sealant, for example an extruded foam silicon rubber 14.
Pairs of hot plate units 2, 3 and 4, 5 are together secured in position by respective support
straps 8, 9, which are secured to the hob pressing 1 by brackets at each end. Only the left hand bracket 15 for the support strap 9 is shown in Figure 2. It will be noted from Figure 2
that the support straps are of channel shape. The hot plate units are resiliently urged
towards the rim of the hob pressing by means of a pair of metal springs 16. arranged at
right angles to each other. Only one is shown in Figure 2; the one at right angles is not illustrated. The hot plate units are additionally located by means of locater screws (or pins)
17 surrounded by ferrules 17a at each end (only that for the left hand end being shown)
which are secured into pre-formed apertures at the end of the canister 1 1.
All the hot plate units are of similar construction, similar to the hot plate unit 4 shown in
Figure 2. The hob pressing 1 has a circular drip region 18 surrounding each of the hot plate
units.
The assembly is as follows. The extruded foam silicon rubber 14, which is backed with
an adhesive strip, in the form of a ring, is placed around the periphery of the ceramic disc 4a or 4c. The disc and seal assembly is then positioned into the respective opening in hob pressing 1. In the case of the disc 4c, the location ridges 4b on the disc centralise the assembly in the opening in the hob pressing. Location pins or screws 17 surrounded by ferrules 17a are secured into pre-formed apertures of canister 11 so as to project from the canister. Canister assembly 1 1 consisting of pre-assembled base 10, support ring 12 and location pins or screws 17 with ferrules is centralised onto the underside of disc 4a, 4c with
the location points on the underside of the disc engaging with the recesses in the support ring. The canister assembly is rotated about its axis until the ferrules surrounding the locater pins or screws align with apertures in the support strap 9 which have the metal
springs 16 attached. This is done for both hot plate units for each support strap 8 or 9.
Finally, the respective pairs of heater assemblies are pressed towards the respective openings in the pressing 1 , and the support straps 8 and 9 are secured to the hob brackets
15.
The construction has a number of advantages. Firstly, the assembly can be carried out
entirely from the underside of the hob pressing. This is a particular advantage in that each
heater is provided with a limiter (not shown) in the conventional way, and the limiter
consists of a glass rod of narrow diameter which extends right across the width of the
heater and projects a Uttle beyond its end. The limiter does not have to pass through the
opening at all in the assembly process. Secondly, in the event that a heavy object e.g. a pan
is dropped on the ceramic glass disc 4a, the shock is partly taken up by the springs 16, and
so damage to the ceramic glass disc 4a is minimised.
Suitable materials for the ceramic material are micro-porous fumed silica mixed with
ceramic or glass fibre and titanium zircon or other suitable oxide for binding; and for the ceramic glass disc are lithium aluminium silicate or magnesium aluminium silicate, with titania or phosphate added to the basic material as a nucleating agent to initiate the formation of the crystals, which are then grown by treating with controlled heat. Such ceramic glass has low thermal expansion, giving good resistance to thermal shock.
Of course variations may be made without departing from the scope of the invention. Thus, instead of the silicon rubber 14 being in the form of a pre-formed ring, it could be
wound around the ceramic disc 4a in a strip, or could, for that matter, be placed as a ring
or wound as a strip around the interior of the rim 13. Further, ptfe could be used instead of silicon rubber. Different forms of spring 16 are possible. The location points on the
underside of the discs 4a, 4c together with the recesses in the ring 12 are optional. Further,
different components could be used in place of the screws/pins 17 and ferrules 17a. Finally the invention is applicable to any number of hot plate units, whether on a separate hob or
on a cooker.
Claims
1. An electric hob comprising a hob surface, a ceramic glass disc extending across an
opening in the hob surface with a peripheral region of the ceramic glass disc lying beneath
the rim of the opening, a heater positioned beneath the ceramic glass disc, and resilient
means arranged so that the ceramic glass disc is resiliently urged towards the rim of the hob
surface.
2. An electric hob as claimed in claim 1 in which the resilient means is positioned
between the underside of the heater and a support strap secured to the underside of the hob.
3. An electric hob substantially as herein described with reference to the accompanying drawings.
4. An electric hob as claimed in any one of claims 1 to 3, in which the hob forms part
of a free-standing cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU35714/95A AU3571495A (en) | 1994-10-18 | 1995-09-27 | Electric hob |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9421024A GB2294317B (en) | 1994-10-18 | 1994-10-18 | Electric hob |
| GB9421024.2 | 1994-10-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1996012387A1 true WO1996012387A1 (en) | 1996-04-25 |
Family
ID=10763051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1995/002300 WO1996012387A1 (en) | 1994-10-18 | 1995-09-27 | Electric hob |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3571495A (en) |
| GB (1) | GB2294317B (en) |
| WO (1) | WO1996012387A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2325604A (en) * | 1997-05-22 | 1998-11-25 | Ceramaspeed Ltd | Electric heater support insulation |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5994674A (en) * | 1993-04-13 | 1999-11-30 | Gda Applied Energy Limited | Hob |
| GB2323922B (en) * | 1997-04-02 | 2001-08-29 | Redring Electric Ltd | A heating unit for a hob |
| DE10041006C2 (en) * | 2000-08-22 | 2002-10-31 | Schott Glas | Glass or glass ceramic pane with edge protection and process for its production |
| DE102004040442A1 (en) * | 2004-08-19 | 2006-03-02 | Electrolux Home Products Corporation N.V. | Glass, ceramic or glass-ceramic plate for use as cooking surface of kitchen stove has recess formed on lower side of disk parallel to work surface of disk |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2301928A1 (en) * | 1972-01-19 | 1973-08-02 | Elektra Bregenz Gmbh | ELECTRIC HEATING, HEATING AND / OR COOKING EQUIPMENT |
| US3987275A (en) * | 1976-02-02 | 1976-10-19 | General Electric Company | Glass plate surface heating unit with sheathed heater |
| DE2814085A1 (en) * | 1977-04-04 | 1978-10-12 | Gen Electric | FREELY EXPANDABLE FILM HEATING ELEMENT |
| US5221829A (en) * | 1990-10-15 | 1993-06-22 | Shimon Yahav | Domestic cooking apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3686477A (en) * | 1971-08-06 | 1972-08-22 | Gen Electric | Mounting system for solid plate surface heating units |
| DE3317624A1 (en) * | 1982-08-13 | 1984-11-15 | Fischer, Karl, 7519 Oberderdingen | Arrangement for building-in an electric cooking plate |
-
1994
- 1994-10-18 GB GB9421024A patent/GB2294317B/en not_active Expired - Fee Related
-
1995
- 1995-09-27 AU AU35714/95A patent/AU3571495A/en not_active Abandoned
- 1995-09-27 WO PCT/GB1995/002300 patent/WO1996012387A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2301928A1 (en) * | 1972-01-19 | 1973-08-02 | Elektra Bregenz Gmbh | ELECTRIC HEATING, HEATING AND / OR COOKING EQUIPMENT |
| US3987275A (en) * | 1976-02-02 | 1976-10-19 | General Electric Company | Glass plate surface heating unit with sheathed heater |
| DE2814085A1 (en) * | 1977-04-04 | 1978-10-12 | Gen Electric | FREELY EXPANDABLE FILM HEATING ELEMENT |
| US5221829A (en) * | 1990-10-15 | 1993-06-22 | Shimon Yahav | Domestic cooking apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2325604A (en) * | 1997-05-22 | 1998-11-25 | Ceramaspeed Ltd | Electric heater support insulation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2294317B (en) | 1998-04-01 |
| GB2294317A (en) | 1996-04-24 |
| AU3571495A (en) | 1996-05-06 |
| GB9421024D0 (en) | 1994-12-07 |
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