Electric resistance heating devices – Heating devices – Radiant heater
Patent
1995-02-21
1997-04-08
Jeffrey, John A.
Electric resistance heating devices
Heating devices
Radiant heater
392436, 392416, 219532, 219537, 219402, 219411, 432249, A47J 3902, F24C 704, F24C 1534
Patent
active
056196130
ABSTRACT:
A heating chamber for maintaining processed foods warm for extended periods while not sacrificing food quality or causing a secular change in the chamber's insulating member. The heating chamber has side walls formed by outer and inner walls made of relatively high heat conducting material, an insulating member interposed between these walls, insulating paper interposed between the insulating member and one side of the inner walls, insulating shield panels mounted on the opposite side of the inner walls, each of the shield panels being a laminate of a second insulating member made of material such as styrene or urethane and a third insulating member made of material such as polyethylene, heater guard frames each presenting a flattened U-shaped cross-section, and a ceramic panel heater mounted on the inner side of each heater guard frame, wherein each of the heater guard frames is mounted on the chamber's inner wall such that each encloses a shield panel while maintaining an air gap between the shield panel and its associated ceramic panel heater. Heat emitted from the ceramic panel heater is transferred through the air gap, the shield panel, the inner wall of the chamber, the insulating paper and to the insulating member so that a thermal affection on this insulating member may be effectively alleviated. The ceramic panel in each heater guard frame is divided, if desired, into a plurality of sections which are in a column, thereby allowing the temperature within the heating chamber to be maintiained uniform.
REFERENCES:
patent: 3057989 (1962-10-01), Needham
patent: 4855567 (1989-08-01), Mueller
patent: 5263114 (1993-11-01), Tavernier
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