Electric heater unit and method of manufacture
AssigneeCeramaspeed Limited
InventorJohn Thomas Hughes
Life of this patent
Estimating the term…
Abstract
An electric heater unit is manufactured so as to form a base in a supporting dish by compacting powdered microporous insulation into the base. At least one electrical resistance heating element is supported on or adjacent to the base and a peripheral wall is formed in the supporting dish and integral with the base by compacting further microporous insulation material into the dish to a controlled compaction density. The compaction density of the peripheral wall may be different from that of the base, for example higher.
Claims26
A method of manufacturing an electric heater comprising the steps of providing a supporting dish, forming in the supporting dish a base by compacting powdered microporous insulation material therein, providing at least one electrical resistance heating element supported relative to the base, and forming in the supporting dish a peripheral wall integral with the base, and having a density higher than that of the base, by compacting further microporous insulation material into the dish to a controlled density higher than the density of the base.
A method of manufacturing an electric heater comprising the steps:
- providing a supporting dish contained in a forming space;
- introducing into the forming space a powdered microporous insulation material;
- forming in the supporting dish a base by compacting the powdered microporous insulation material therein;
- providing at least one electrical resistance heating element supported relative to the base;
- introducing into the forming space further microporous insulation material;
- and forming in the supporting dish a peripheral wall integral with the base, and having a density higher than that of the base, at least in part by compacting the further microporous insulation material into the dish to a controlled density higher than the density of the base.
Dependencies are inferred from the claim text.