Abstract A heating device includes electric resistance wire and a glass plate cover for the wire, the wire being made of molybdenum disilicide, having a positive temperature coefficient of resistance, and comprising at least two series-interconnected sections of differing cross-sectional areas. The wire is supported on the flat surface of a refractory body, and is adjacent to but spaced from the glass plate cover, the body enclosing both sections with the side of the glass plate cover which faces the wire. The two sections of differing crosssectional areas may be proportioned relative to each other and to the electric power used, so that upon initial energization, the section of smaller cross-sectional area receives maximum power and almost immediately flashes to incandescence while converting the space enclosed by the body and the glass plate cover into a heating chamber heating the section of larger cross-sectional area which, with increasing temperature, increases in resistance to lower the current through the section of lower cross-sectional area, the power consumption of the device then stabilizing at a lower value. Incorporation of the device into the horizontal flat top of a cooking stove, for heating a cooking vessel on top of the glass plate mainly by radiation, provides for a substantially instantaneous high cooking heat followed by stabilization of the temperature.
AN ELECTRIC COOKING STOVE ASSEMBLY COMPRISING A FLAT GLASS PLATE FORMING A COOKING SURFACE AREA, A CONVOLUTED MULYBDENUM DISILICIDE WIRE FOMING A LAYER POSITIONED SUBSTANTIALLY PARALLEL WITH AND BELOW SAID PLATE AND COVERING AN AREA SUBSTANTIALLY CO-EXTENSIVE WITH SAID COOKING SURFACE AREA, SAID WIRE HAVING OPPOSITE ENDS FOR CONNECTION WITH ELECTRIC POWER AND HAVING AT LEAST ONE PORTION BETWEEN SAID ENDS, WHICH PORTION HAS A LARGER CROSS-SECTIONAL SIZE THAN THE BALANCE OF TH E WIRE, SAID WIRE FORMING A CONTINUOUS CIRCUIT FROM ONE OF ITS ENDS TO ITS OTHER END WITH SAID PORTION IN SERIES WITH THE BALANCE OF THE WIRE, A REFRACTORY BODY FORMING A FLAT SURFACE EXTENDING SUBSTANTIALLY CO-EXTENSIVELY WITH SAID LAYER OF WIRE AND HAVING UPSTANDING REFRACTORY FIBERS ON WHICH SAID LAYER OF WIRE IS SUPPORTED AND WITH THE FIBERS FUSED TO THE WIRE, AND A REFRACTORY ANNULUS PERIPHERALLY SURROUNDING SAID LYER OF WIRE AND INTERCONNECTING SAID GLASS PLATE AND REFRACTORY SURFACE SO AS TO SUBSTANTIALLY ENCLOSE A SPACE CONTAINING SAID LAYER OF WIRE.
Claim 2
Dependent Claim
167 words
AN ELECTRIC COOKING STOVE ASSEMBLY COMPRISING A FLAT GLASS PLATE FORMING A COOKING SURFACE AREA, A CONVOLUTED MULYBDENUM DISILICIDE WIRE FOMING A LAYER POSITIONED SUBSTANTIALLY PARALLEL WITH AND BELOW SAID PLATE AND COVERING AN AREA SUBSTANTIALLY CO-EXTENSIVE WITH SAID COOKING SURFACE AREA, SAID WIRE HAVING OPPOSITE ENDS FOR CONNECTION WITH ELECTRIC POWER AND HAVING AT LEAST ONE PORTION BETWEEN SAID ENDS, WHICH PORTION HAS A LARGER CROSS-SECTIONAL SIZE THAN THE BALANCE OF TH E WIRE, SAID WIRE FORMING A CONTINUOUS CIRCUIT FROM ONE OF ITS ENDS TO ITS OTHER END WITH SAID PORTION IN SERIES WITH THE BALANCE OF THE WIRE, A REFRACTORY BODY FORMING A FLAT SURFACE EXTENDING SUBSTANTIALLY CO-EXTENSIVELY WITH SAID LAYER OF WIRE AND HAVING UPSTANDING REFRACTORY FIBERS ON WHICH SAID LAYER OF WIRE IS SUPPORTED AND WITH THE FIBERS FUSED TO THE WIRE, AND A REFRACTORY ANNULUS PERIPHERALLY SURROUNDING SAID LYER OF WIRE AND INTERCONNECTING SAID GLASS PLATE AND REFRACTORY SURFACE SO AS TO SUBSTANTIALLY ENCLOSE A SPACE CONTAINING SAID LAYER OF WIRE.
Claim 3
Dependent Claim
16 words
The assembly of claim 1 in which said molybdenum disilicide wire is convoluted in zigzag form.
Claim 4
Dependent Claim
17 words
The assembly of claim 1 in which said molybdenum disilicide wire is convoluted in spiral coil form.