Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
1999-09-03
2001-01-09
Pelham, Joseph (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S432000, C219S435000, C099S3290RT
Reexamination Certificate
active
06172339
ABSTRACT:
This application is a national phase of international application PCT/FR98/02661 filed Dec. 8, 1998 which designated the U.S.
TECHNICAL FIELD
The present invention relates to the general technical field of electric cooking appliances comprising a removable cooking bowl and concerns more particularly the thermal protection means.
The invention concerns cooking appliances with a removable bowl, the heating power of which permits foodstuffs disposed in the bowl to be brought to temperatures greater than or equal to 140° C. The invention concerns in particular fryers.
In appliances of the above-cited type a control of the operation of the heating means in the absence of the removable bowl is necessary, because of the high power of the heating means.
PRIOR ART
Patent application WO 96/05761 describes an electric heating appliance for foods, in particular for performing frying, comprising a removable bowl, said appliance being furnished with a safety body provided to prevent heating in the absence of the bowl, as well as in situations where the bowl correctly installed in the body of the appliance contains an insufficient quantity of fat, or even no fat at all. This device has the drawback of comprising a large number of mechanical parts and necessitating a very precise assembly, there are also numerous gaps favorable for dirt and infiltrations of fat or of steam. This device is thus costly and unreliable.
It is known moreover to provide an electric fryer with a removable bowl comprising a device for detecting the presence of the bowl provided to prevent heating in the absence of the bowl, formed by a switch whose button is actuated by the bowl correctly positioned in the appliance, as well as a safety limit switch mounted on a counter-bowl behind a sheet provided to come in contact with the bowl when this latter is disposed in the appliance body. The safety limit switch is provided to open the electric circuit before the fuse is activated as a result of heating of the appliance, when the bowl contains no fat or a quantity very much less than the expected quantity. Because of the high power of the heating means, the body of the appliance and the cover made of plastic material are susceptible to be damaged if the appliance is placed in operation in the absence of the bowl. The above-cited device for detection of the presence of a bowl permits these drawbacks to be avoided. This device presents however the drawback of comprising several movable mechanical elements, accessible to the user and capable of being displaced and/or deteriorated by the latter during cleaning.
SUMMARY OF THE INVENTION
The object of the invention aims in consequence to provide a remedy to the different drawbacks enumerated previously and to furnish an electric cooking appliance with a removable bowl comprising a particularly simple and tested thermal protection means.
The objects assigned to the invention are achieved with the aid of an electric cooking appliance, comprising a body forming a housing provided to receive a removable bowl, heating means in thermal communication with the bowl when the latter is disposed in the housing, heat adjusting means, ultimate safety means provided to compensate for failure of the heat adjusting means, comprising a thermal limit switch mounted on a support disposed in the body, said limit switch being susceptible to being triggered before the ultimate safety means when the bowl is not disposed in the housing.
This construction permits detection by the limit switch of an abnormal heating intervening in the housing in the absence of a bowl. This construction offers the advantage of avoiding heating or damaging of the appliance without utilizing a mechanical detector of the presence of the bowl formed by safety elements comprising a movable part with respect to the body of the appliance.
Advantageously, the body comprises a counter-bowl forming the support on which the limit switch is mounted, the interior face of the counter-bowl delimiting the housing.
This construction permits particularly to avoid degradation of the body when this latter is made of a plastic material having a limited temperature resistance.
Advantageously the limit switch is manually resettable.
This arrangement permits the user to become aware of a non-conforming utilization of the appliance or of a defect in the adjusting means. Placing the appliance back into operation requires a voluntary action, either by the user when the appliance comprises a resetting organ accessible to the user, or by the repair service in the contrary case.
REFERENCES:
patent: 4164644 (1979-08-01), Remsnyder et al.
patent: 4307287 (1981-12-01), Weiss
patent: 5740721 (1998-04-01), Bizard et al.
patent: 5809870 (1998-09-01), Baillieul
patent: 3143450 (1983-05-01), None
patent: 3430878 (1986-03-01), None
patent: 297 09 294[0 U (1997-09-01), None
patent: 133906 (1985-03-01), None
patent: 2222025 (1990-02-01), None
patent: 2 306 878 (1997-05-01), None
patent: FR95/01103 (1996-02-01), None
Browdy and Neimark
Pelham Joseph
Seb S.A.
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