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AssigneeTemro Division, Budd Canada Inc.
InventorsGary C. Edwards, Ronald H. Schaefer
Estimating the term…
A heating element for an air flow comprises a channel shaped bracket including a base and side walls at right angles thereto within which is mounted a pair of mica sheets arranged parallel to the base and at right angles to the sides and connected to the sides by ribs longitudinally of the sides with transverse slots within which the sheets slide. Each sheet is wrapped with a heating wire formed into helical coils so that each side of the sheet carries a plurality of parallel helical coil portions with connecting portions wrapped over the edges of the sheet. The sheets are symmetrical and one is inverted relative to the other. Each sheet carries at ends thereof a male and a female connector of the blade and receptacle type so that the blade of one sheet engages into the receptacle of the other sheet. The connectors thus provide mechanical support to hold the sheet in spaced position and in addition provide electrical connection across the sheets so that electrical energy from supply wires is connected in parallel across the wires of the two sheets. The structure is simple to manufacture and provides a structurally rigid arrangement with high wire density leading to reduced wire temperature.
A heating element for heating an air flow passing thereover comprising a first substrate sheet and a second substrate sheet each formed of an electrically non-conductive material and defining a first side, a second opposed side, a first side edge, a second opposed side edge, a first end and a second opposed end, each substrate sheet having wound generally therearound a continuous electrical resistance heating wire, the wire being shaped so as to form a plurality of separate generally parallel helical coils and a plurality of interconnecting portions, the helical coils including a first helical coil and a last helical coil, alternate ones of the helical coils being arranged on the first and second sides of the sheet respectively, each helical coil extending from a position adjacent the first side edge to a position adjacent the second side edge, each end of each helical coil except the first on one side of each substrate sheet and the last on the other side of each substrate sheet being connected by a respective one of the interconnecting portions to a respective corresponding end of two helical coils on the other side, connecting means for supporting the first and second substrate sheets in substantially parallel spaced generally overlying relation with the first side of the first sheet facing the first side of the second sheet such that the helical coils on the first side of the first sheet are adjacent to but spaced from the helical coils on the first side of the second sheet so as to allow the passage of the air flow therebetween, and first and second terminal means for connection to a source of electrical power, said connecting means being arranged to provide both mechanical support between the first and second sheets and also electrical connection between the heating wire of the first sheet and the heating wire of the second sheet the connecting means and The first and second terminal means being arranged such that electrical power flows through the heating wires of both of said sheets.
A heater comprising a fan for generating an air flow, and a heating element mounted so as to receive the air flow passing thereover, said heating element comprising a first substrate sheet and a second substrate sheet each formed of an electrically non-conductive material and defining a first side, a second opposed side, a first side edge, a second opposed side edge, a first end and a second opposed end, each substrate sheet having wound generally therearound a continuous electrical resistance heating wire, the wire being shaped so as to form a plurality of separate generally parallel helical coils and a plurality of interconnecting portions, the helical coils including a first helical coil and a last helical alternate ones of the helical coils being arranged on the first and second sides of the sheet respectively, each helical coil extending from a position adjacent one side edge to a position adjacent the second side edge, each end of each helical coil except the first on one side of each substrate sheet and the last on the other side of each substrate sheet being connected by a respective one of the interconnecting portions to a respective corresponding end of two helical coils on the other side, first and second terminals means for connection to a source of electrical power connected to said heating wires and arranged relative thereto for effecting for transmission of a current through the heating wires of each of said sheets and connecting means for supporting the first and second substrate sheets in substantially parallel spaced generally overlying relation with the first side of the first sheet facing the first side of the second sheet such that the helical coils on the first side of the first sheet are adjacent to but spaced from the helical coils on the first side of the second sheet so as to allow the passage of the air flow therebetween, said connecting means being arranged adjacent said ends of the sheets outwardly beyond end most ones of the helical coils such that an area between the sheets at the helical coils is free from elements between the sheets causing restriction of the air flow therebetween.
Dependencies are inferred from the claim text.