Abstract: A heating element (for a hair dryer, fan heater or other electrical appliance) in which the turns of resistance heating wire are held in place, in edge recesses of support plate means, by a strip of heat-resistant cement applied to the supporting edges and over the turns of the wire. The cement is non-wetting with respect to the heating wire.

Abstract: An electric tubular heater with a bent jacket tube made of strip material, an electric resistance heating element running in the jacket tube and an electrically insulating embedding material surrounding the resistance heating element. The jacket tube is formed into a closed cross-sectional configuration by deformation of the extremities of the strip material by either bending into an overlapping relationship or by folding the extremities over each other. The bending of the extremities is performed so as to compress the embedding material to its predetermined final density and final cross-sectional configuration according to preferred embodiments.

Abstract: A heating element for electrical appliances which include a meander-form winding of resistance heating wire, two or more supporting plates arranged parallel to an incident flow direction of air produced by the blower and having openings in which turns of the winding are located. Metallic spacer elements are provided for connecting the supporting plates with a voltage tap being provided on at least one of the turns of the winding. At least one of the spacer elements is provided with a prolongation which projects beyond one of the supporting plates and is deformable to constitute a sleeve engaging about a turn of the winding.

Abstract: A heating element comprises a resistance heating wire formed with closely adjacent zigzag loops and wound helically on an insulating plate or a pair of such plates mounted crosswise and possibly narrowing conically towards one end. Opposite loops engage the respective edges of such insulating plate, possibly in notches in those edges, and may be pressed on to those edges. The plate may have holes near its edges, the engaging loops being formed with kinks which clip into the holes. Spring clips may be provided for electrical connections to such loops at the edge of such plate and may also be formed with kinks which clip into the said kinks of the loops. The electrical connection to such spring clip may be a cable rivetted, eyeletted or soldered to a cross-piece interconnecting the legs of the clip or may comprise an angled tongue formed at the end of one of the legs to receive a flat plug-in connector.

Abstract: A fan-heater appliance, e.g., hair drier, has a tapping arrangement for providing a variable supply to a fan motor to regulate the speed thereof. The tapping arrangement comprises a current collector which is slidable over a row of heads of tubular rivets which are attached to the coil tips of a linearly coiled resistance heating wire arranged transversely of the air flow path through the appliance. The current collector is operated by a crank arrangement including a knurled disc operator.

Abstract: A refractory, granular electrically insulative composition useful as an embedding composition for electric heating coils comprises fused and granulated, possibly ground, difficultly fusible, ceramic and possibly oxide-ceramic material having polyalkylsiloxane, e.g. polymethylsiloxane, or polyarylsiloxane admixed in a proportion of from 0.5 to 5.0% added weight. Use of the composition is suitable with tubular heaters which have been produced with it and which, after manufacture and before being brought into use, have been subjected to a heat treatment at a temperature of at least 65.degree. C, for a period of at least 10 minutes. An electrical heating element comprises a housing which is embedded in the composition wherein the ceramic and possibly oxide-ceramic material has been ground.

Abstract: A vaporizing and warming device for beverage-preparing machines, such as household coffee machines and the like of the type which include a hot plate for keeping the prepared beverage warm, a vaporizer tube carrying water for preparing the beverage and a heating element for transferring the heat required for the respective vaporization and warming processes. The heating element is thermally conductively connected with the vaporizer tube and is arranged together with the vaporizer tube at one side, preferably the underside of a horizontally extending hot plate. The heating element is arranged laterally offset with respect to the vaporizer tube and with its apex at a perpendicular distance from the hot plate which is smaller than the height of the vaporizer tube perpdendicularly to the hot plate, whereby conductive heat transfer from the heating element to the hot plate is avoided while still providing heat to the vaporizer tube, which vaporizer tube is in contact with the hot plate.

Abstract: A heating element for an electrical appliance having a blower (e.g. a fan heater or a hair drier) comprises a wire looped in linear formation (e.g. zig-zag or sinuous) the loops being held in position by support plates so that there are at least two loop rows transverse to the air flow direction and disposed in succession in that direction and so that the loops in one of those rows are placed opposite to gaps in the other. In an element having four loop rows with a center taping for two-stage power control the electrical connections are disposed on only one support plate with the center tapping connection at the same side of the plate as the means supply connections; also, the loops in a first pair of rows are aligned with one another and are offset from the loops in the second pair which are also aligned with one another.

Abstract: A heater element for an electrical appliance (especially one having a blower, such as a fan heater, hair drier or the like) consists of a resistance heating wire looped in linear formation (e.g. zig-zag) and held transversely of the air flow direction by at least one support plate disposed parallel to said direction. The element has a voltage tapping point at the tip of one of the loops which projects beyond the other loops and has its tip fixed to an insulating panel parallel to said support plate. Said tip may be riveted or secured by an eye in a recess in said insulating plate.

Abstract: A device for preventing ice formation on parts of aircraft-support surfaces (wings or aerofoils), propellers, rotor blades or the like-comprises electrical resistance heaters embedded in a shell of thermally conducting material (e.g. aluminium sheet or moulding) sheathing the aircraft part. Thermally insulating, thermally conducting and electrically insulating layers may be provided within the shell. The heaters, or some of them, may be controlled by a temperature sensor in or on the shell.