Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-08-24
1993-03-23
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
219413, 374121, G08B 1700
Patent
active
051968304
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION AND PRIOR ART
The invention is related to an apparatus for supervising objects, such as hot plates and electrical stoves, with regard to overheating, said apparatus comprising at least one detector for detecting overheating conditions and a device controlled by the detector for delivering indication, alarm and/or breaking supply of energy to the object.
Investigations illustrate that a great number of accidents occur by ignition of overheated objects. Thus, 30% of all fires in homes are, for instance, caused by electrical stoves, i.e. by the user having forgotten to turn off the stove. Even in cases where such negligence does not involve fire, other economic damage, namely destroyed hot plates and/or cooking-vessels, occurs due to overheating Injuries to persons and damages to property also occur with other types of objects, such as electrical apparatus, machines and motors, as a consequence of overheating.
As far as stoves are concerned it should be pointed out that a fire hazard may well be at hand without the hot plates being excessively heated. In cooking, ingredients are often used which may be ignited at relatively low temperatures. It would be desirable to be able to detect ignition of such ingredients.
SUMMARY OF THE INVENTION
The object of the present invention is to devise a supervising apparatus which is capable of supervising objects, such as hot plates and electrical stoves, with regard particularly to overheating, said apparatus preferably being such that the desired activity, such as alarm and/or current breaking, occurs not only on excessive heating but also when a fire or open flame occurs at temperatures of the object which have not reached excessive levels.
This object is, according to the invention, achieved by means of the features more closely defined in the appended claims.
The detector is preferably a detector for infrared radiation (IR-detector) arranged at a distance from the object for detecting heat radiation emitted therefrom. This solution gives a very simple and efficient embodiment since the detector arranged away from the object may supervise the temperature state at or adjacent to the object without being subjected to the same heating as the object. Furthermore, the detector does not only react to the temperature of the object itself, e.g. hot plates thereof, but also to possible open flames.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the enclosed drawings, a more specific description of embodiment examples of the invention will follow hereinbelow:
In the drawings:
FIGS. 1 and 2 are front and side views respectively of a stove installation and a supervising apparatus installed in connection therewith;
FIG. 3 is a view from the front and the side respectively of the supervising apparatus itself;
FIG. 4 is a block diagram illustrating operation and construction of the supervising apparatus;
FIG. 5 is a diagrammatical view illustrating the design of a device for breaking the normal current supply to the supervised object;
FIG. 6 is an elementary diagram over the design of the breaking device in FIG. 5;
FIG. 7 is a diagrammatical view of a detector device; and
FIG. 8 is a diagram illustrating an alternative to the embodiment according to FIG. 5.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
A conventional installation of an electrical stove 1 having hot plates 2 is illustrated in FIGS. 1 and 2. A fan or hood 3 for catching fumes is normally arranged above the stove. User controlled on/off switches 2a control current supply to hot plates 2.
The supervising apparatus according to the invention is in FIGS. 1 and 2 indicated at 4 and illustrated at a greater scale in FIG. 3. The apparatus comprises a detector for detecting conditions of overheating and a device controlled by the detector for delivering alarm as to such conditions of overheating. These components are built into a caselike housing 5. The detector is more specifically a detector for infrared radiation (IR-detector). As appears from FIGS. 1 and 2 the apparatus 4 a
REFERENCES:
patent: 3700306 (1972-10-01), Cartmell et al.
patent: 3893092 (1975-07-01), Kessler
patent: 3949366 (1976-04-01), Spillar et al.
patent: 4161654 (1979-07-01), Szarewicz et al.
patent: 4286134 (1981-08-01), Nakata et al.
patent: 4864283 (1989-09-01), Seto
Ardesjo Carl-Gosta
Birging Torbjorn
Mullen Jr. Thomas J.
Ng Jin F.
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