Electric heating – Heating devices – Combined with pressure application means
Patent
1999-09-23
2000-11-07
Jeffery, John A.
Electric heating
Heating devices
Combined with pressure application means
219254, 219543, 219541, 38 82, 38 771, H05B 330, H05B 306, D06F 7500
Patent
active
061440140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an electric component comprising a small electrically isolating ceramic plate carrying on one of its faces a screened resistive and/or conductive pattern, the other face of this small ceramic plate being in contact with another plate intended to be heated and the temperature of which it is desired to measure.
The invention is also concerned with a household electric steam appliance and in particular a steam iron having an electric component of the above type.
In an appliance of the above type, one of the problems to be resolved is to assure electrical connection and electrical isolation of the electrical component and of its connector in a durable fashion in a hot and humid environment, that is a temperature comprised between 250.degree. and 300.degree. C. and a humidity level of 100%.
The above component is most often fixed on the plate whose temperature is to be raised by a cement (for example, silicone) layer assuring a mechanical gripping and heat transfer.
The electrical connection can be achieved by an association of cemented contacts and wires or by metal contacts maintained under pressure against the resistive and/or conductive patterns.
Such a construction presents the drawback that under the combined effects of temperature and moisture, electrical contacts become detached or oxidized; in addition, by condensing on the circuit, the moisture provokes current leakages at different points thereof.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to remedy the above drawbacks.
The invention is thus directed to an electrical component comprising a small electrically isolating ceramic plate carrying on one of its faces a screened resistive and/or conductive pattern, the other face of this small ceramic plate being in contact with a metal plate intended to be heated or whose temperature is to be measured, the pattern having at least one metallized end to establish an electric connection with a conductive wire.
According to the invention, this electrical component is characterized in that the conductive wire is soldered onto said metallized end and in that the small ceramic plate is entirely covered by a metal cover whose peripheral edges surround said small plate and are fixed in sealed manner to the metal plate by means of a resin, the lateral wall of said cover having at least one opening for the passage of the conductive wire or wires, said opening or openings being blocked by a sealing resin.
The totality of the above arrangements permits an electric component according to the invention to withstand the temperature and humidity conditions referred to above.
According to an advantageous version of the invention, said cover has a parallelepiped form whose lateral faces have a height greater than the thickness of the small ceramic plate in a manner to leave a space between the pattern and the upper wall of the cover.
Preferably, the conductive wire soldered onto said metallized end is covered by an epoxy resin base cement.
Advantageously, the small ceramic plate is cemented onto the metal plate by means of a cement layer.
According to a preferred version of the invention, the cement layer overflows to the periphery of the small ceramic plate in a manner to simultaneously assure cementing of the peripheral edge of the cover on the metal plate.
Advantageously, said cement layer is sufficiently thick to assure watertightness of the openings or of the conductive wires.
According to another preferred version of the invention, said space situated between the upper wall of the cover and the resistive and/or conductive pattern is filled by a resin, this resin itself assuring the fixation of the cover onto the metal plate and the blocking of the opening or openings for passage of the conductive wire or wires.
In a preferred application of the invention, said metal plate forms a part of the soleplate of a steam pressing iron.
The invention is equally concerned with a household electrical appliance in particular a steam pressing ir
REFERENCES:
patent: 729369 (1903-05-01), Loewenthal
patent: 3007026 (1961-10-01), Woodling
patent: 4713529 (1987-12-01), Melanson et al.
patent: 4730102 (1988-03-01), Melanson
patent: 5475199 (1995-12-01), Buchanan
Japanese Patents Gazette, Week 8810, Derwent Publications, AN88-067443, XP002097440 and JP 63 021100, Jan. 28, 1988, abstract.
Dodier Philippo
Gailhard Thierry
Jeffery John A.
Seb S.A.
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