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US 5,847,368 AGranted
Electric heating unit and method of producing same
AssigneeKoyo Lindberg Limited
InventorYasuo Sugiyama
Life of this patent
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AssigneeKoyo Lindberg Limited
InventorYasuo Sugiyama
Estimating the term…
An electric heating unit comprises a heat-insulating main body consisting primarily of a heat-insulating material and formed with a groove in a surface thereof, and a heating element provided in the groove and shaped in the form of waves with an amplitude greater than the width of the groove, the heating element having at widthwise opposite sides thereof bent portions extending into the main body from groove-defining opposite side walls thereof and thereby integrally supported by the main body. A bottom-forming member of refractory material made separately from the main body covers the bottom of the groove and is supported by the main body integrally therewith so that the surface of the member toward the opening of the groove is exposed from the main body. The heating element is disposed closer to the groove opening than the bottom-forming member and integrally supported by the main body so as to be in contact with portions of the surface of the member. The heating element is positioned within the groove and exposed outside the main body.
An electric heating unit comprising a heat-insulating main body consisting primarily of a heat-insulating material and formed with a groove in a surface thereof, and a heating element provided in the groove and shaped in the form of waves with an amplitude greater than the width of the groove, the heating element having at widthwise opposite sides thereof bent portions extending into the main body from groove-defining opposite side walls thereof and thereby supported by the main body integrally therewith, the electric heating unit being characterized in that a bottom-forming member of refractory material made separately from the heat-insulating main body covers a bottom of the groove and is supported by the main body integrally therewith so that a surface of the bottom-forming member toward an opening of the groove is exposed from the main body, the heating element being disposed closer to the groove opening than the bottom-forming member and supported by the main body integrally therewith so as to be in contact with portions of the surface of the bottom-forming member, the heating element being positioned within the groove and exposed outside the main body.
An electric heating unit produced by vacuum molding and comprising a heat-insulating molded body consisting mainly of ceramic fibers and formed with a groove in a surface thereof, and a heating element shaped in the form of waves and supported as provided in the groove by the molded body integrally therewith, the electric heating unit being characterized in that the molded body is caused to support a bottom-forming member of refractory material and the heating element thereon integrally therewith by disposing the bottom-forming member on the heating element in contact with portions of the element and out of contact with a groove-forming ridge portion provided or placed in position within a vacuum mold, the heating element being shaped in the form of waves and disposed along the ridge portion so as to be at least partly in contact with the ridge portion, the bottom-forming member being externally so dimensioned in section orthogonal to the ridge portion as to cover a portion of the heating element included in the amplitude of waveform of the element and approximately corresponding to the width of the ridge portion, and subjecting the resulting arrangement to a vacuum molding operation.
A method of producing by vacuum molding an electric heating unit comprising a heat-insulating molded body consisting mainly of ceramic fibers and formed with a groove in a surface thereof, and a heating element shaped in the form of waves and supported as provided in the groove by the molded body integrally therewith, the method being characterized by disposing the heating element shaped in the form of waves along a groove-forming ridge portion provided or placed in position within a vacuum mold so as to be at least partly in contact with the ridge portion, disposing a bottom-forming member of refractory material on the heating element in contact with portions of the element and out of contact with the ridge portion, the bottom-forming member being externally so dimensioned in section orthogonal to the ridge portion as to cover a portion of the heating element included in the amplitude of waveform of the element and approximately corresponding to the width of the ridge portion, and subjecting the resulting arrangement to a vacuum molding operation to prepare a heat-insulating molded body integrally with the bottom-forming member and the heating element.
Dependencies are inferred from the claim text.