Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2000-09-20
2001-07-17
Pelham, Joseph (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S391000, C392S408000
Reexamination Certificate
active
06262395
ABSTRACT:
This invention relates to an electric oven having an oven cavity for receiving one or more items, such as food items, to be heated and in which one or more electrical resistance heating elements are provided and also means to illuminate the oven cavity.
BACKGROUND TO THE INVENTION
Such ovens are known, in which the one or more electrical resistance heating elements comprise one or more radiant electric heating elements which may be provided as the sole source of heating, or may be provided as an additional source of heating, such as in microwave ovens. Such one or more heating elements may be incorporated in one or more heaters located at a wall of the oven cavity.
It is a general requirement in such ovens to provide an electric light source for illuminating the oven cavity during operation of the oven and/or at other times, such as when the oven door is open. Such a light source, in the form of a filament lamp operated at mains voltage, has hitherto been provided as a separate installation from the heating element or elements, typically being located as a unit recessed into an aperture in a wall of the oven cavity and requiring some form of protective covering.
OBJECT OF THE INVENTION
It is an object of the present invention to provide an electric oven in which such a separate installation for an electric light source for illuminating the oven cavity is not required.
SUMMARY OF THE INVENTION
According to the present invention there is provided an electric oven having an oven cavity for receiving an item to be heated, a radiant electric heater incorporating at least one heating element and supported at a wall of the cavity and having a face directed towards the cavity for radiating heat into the cavity from the at least one heating element, the face of the heater being covered by a light-permeable sheet spaced from the heating element, the sheet being in the form of a fabric, and electric lamp means incorporated in the heater behind the sheet and additional to the at least one heating element so as to provide illumination of the oven cavity through the sheet.
The fabric may comprise filaments or a lattice of glass, ceramic, or metal.
The electric lamp means may be operated independently of the at least one heating element.
The electric lamp means may be provided at a substantially central location in the heater.
The heater may be provided with a base relative to (on or adjacent to) which the at least one heating element is supported, the base having an aperture therein for receiving the electric lamp means.
The base may comprise or contain thermal insulation material, such as microporous thermal insulation material.
Peripheral wall means may be provided, separate from or integral with the base, the light-permeable sheet being arranged to overlie the wall means.
Thermal insulation means may be provided to shield the electric lamp means from heat from the at least one heating element. Such thermal insulation means may be arranged to at least partially border the electric lamp means and may comprise bound vermiculite, or microporous thermal insulation material, or a mixture of microporous thermal insulation material with one or more granular materials such as vermiculite.
The thermal insulation means may be of substantially tubular form.
The electric lamp means may comprise a filament lamp.
The electric lamp means may operate at substantially the same voltage as the at least one heating element.
An apertured member may be provided overlying the light-permeable sheet. Such apertured member may comprise a perforated sheet, or a lattice arrangement, of metal or ceramic.
When the fabric of the light-permeable sheet comprises glass or ceramic filaments, these may be of woven, knitted or mat form in the fabric.
When the fabric of the light-permeable sheet comprises metal filaments, these may be of loosely woven or knitted form in the fabric.
When the fabric of the light-permeable sheet comprises a lattice, this may be of pressed or expanded form, particularly of metal.
It would have been considered that the presence of the fabric sheet would result in insufficient illumination of the oven cavity. Surprisingly this is not so.
For a better understanding of the present invention and to show more clearly how it may be carried into effect reference will now be made, by way of example, to the accompanying drawings in which:
REFERENCES:
patent: 2752477 (1956-06-01), Norris
patent: 4430541 (1984-02-01), Day, Jr.
patent: 4761529 (1988-08-01), Tsisios
patent: 4771154 (1988-09-01), Bell et al.
patent: 6188048 (2001-02-01), Wilkins et al.
patent: 2831804 (1979-02-01), None
patent: 3404430 (1985-08-01), None
patent: 9109220 (1991-11-01), None
patent: 0918448 (1999-05-01), None
English Language EPODOC Abstract of DE 3404430.
Ceramaspeed Limited
Dorman Ira S.
Pelham Joseph
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