Electrical heating unit with serpentine heating element
AssigneeGeneral Signal Corporation
InventorLudwig Porzky
Life of this patent
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Abstract
A heating unit combining a block of thermal and electrical insulating material and an electrical resistance element in which the block contains a mass of ceramic fibers bound together and has an elongated slot with confronting walls rising to the surface of the block from opposite sides of a land, and the resistance element is in the form of a thin member constructed of a continuous resistance wire which is provided with opposite bends to form a serpentine shape, the bends being embedded in the opposite walls of the block to secure the electrical resistance element on the block, and the resistance element abutting the land of the slot between the walls thereof.
Claims12
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having an elongated slot, said slot having walls extending into the block from the surface of the block on opposite sides of the axis of elongation of the slot, an elongated heating element disposed within the slot and engaging the walls of the slot, said heating element having a serpentine electrical conductor extending outwardly on opposite sides of the axis of elongation of the heating element, and said heating element having portions extending through the walls and embedded in the block.
A combination heating and thermal insulating unit for heating a particular region comprising a ceramic fiber thermal insulating block having a surface adapted to confront the region to be heated, said block being constructed of electrical insulating material and having a plurality of parallel linear slots, each of said slots having opposed walls extending from the surface therein on opposite sides of the axis thereof and a land extending between the walls thereof, a linear heating element disposed within each slot in abutment with the land thereof, said heating element comprising a resistance wire having a first plurality of bends disposed on one side of the axis of the slot and a second plurality of bends disposed on the other side of the axis of the slot, the bends of the first plurality being connected in series with the bends of the second plurality, at least a portion of the bends of the first plurality being embedded in the block adjacent to one wall of the slot and at least a portion of the bends of the second plurality being embedded in the block adjacent to the other wall of the slot.
Dependencies are inferred from the claim text.