Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2000-01-13
2001-08-14
Paik, Sang (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
Reexamination Certificate
active
06274849
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to radiant electric heaters which find particular application in cooking appliances such as glass-ceramic cooking appliances.
DESCRIPTION OF PRIOR ART
It has been well known for many years to produce radiant electric heaters for glass-ceramic cooking appliances in which a layer of insulation material, particularly microporous insulation material, is provided in a reinforcing means in the form of a metal dish. A heating element is supported on or adjacent to the insulation layer and a peripheral wall of insulation material is provided against the inside of the side edge of the dish. A terminal block, for connecting the heating element to a voltage supply, is usually provided secured to a side edge of the dish.
A temperature limiting device is also usually provided, secured to the dish and having a rod-like portion extending at least partly across the heater, over the heating element.
In order to save costs, it has previously been proposed to dispense with the metal dish and provide a dish-like component of thermal insulation material inside which at least one heating element is supported. For maximum thermal efficiency it is preferred that the dish-like component should comprise compacted microporous insulation material. However, such material is relatively soft and the dish-like component may be relatively fragile. Furthermore it is difficult to secure a terminal block and a temperature limiting device thereto.
OBJECT OF THE INVENTION
It is an object of the present invention to overcome or minimise these problems.
SUMMARY OF THE INVENTION
According to the present invention there is provided a radiant electric heater comprising a dish-like component of thermal insulation material having a base and an upstanding peripheral wall, at least one heating element supported inside the dish-like component, and reinforcing means secured to the dish-like component at the outside thereof, wherein the reinforcing means comprises at least one strip extending across the base and at least partly up the peripheral wall of the dish-like component.
The at least one strip may have opposite ends thereof extending at least partly up the peripheral wall.
The reinforcing means may comprise at least two strips extending at an angle to one another across the base and at least partly up the peripheral wall of the dish-like component. The at least two strips may be arranged substantially orthogonal to one another. The at least two strips may be provided as separate components crossing one another and/or secured to one another, or may be provided as limbs of a single integral component.
A terminal block and/or a temperature limiting device may be secured to the reinforcing means and suitably to one or more portions of the at least one strip thereof which extend at least partly up the peripheral wall.
The at least one strip of the reinforcing means may be secured to the dish-like component at the peripheral wall thereof. Such securing may be by means of a deformed portion, for example a cut out deformed portion, of the at least one strip extending towards (into or over) the peripheral wall.
The at least one strip of the reinforcing means may incorporate at least one stiffening rib, which may run longitudinally along the at least one strip.
The reinforcing means may comprise metal.
The thermal insulation material of the dish-like component may comprise compacted microporous thermal insulation material.
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: 3627986 (1971-12-01), Anderson
patent: 3632983 (1972-01-01), Dills
patent: 4150280 (1979-04-01), Hurko
patent: 4251716 (1981-02-01), Lewis et al.
patent: 4264805 (1981-04-01), Traut
patent: 5512731 (1996-04-01), McWilliams
Ceramaspeed Limited
Dorman Ira S.
Paik Sang
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