Abstract: A device (100, 200, 1100, 2100) converts electricity into heat. A first flat winding support (110, 130, 210a, 210b, 230a, 230b, 310a, 310b, 330a, 330b, 510, 610, 630, 710, 1110, 1130, 2110, 2130) including electrically insulating material, has a first electric heating element (140, 150, 240a, 240b, 250a, 250b, 340a, 340b, 350a, 350b, 540, 640, 650, 740, 750) wound thereon. The first flat winding support with wound first electric heating element is inserted into a housing (190, 290, 1190, 2190) electrically insulated against the housing. A second flat winding support, including electrically insulating material, has a second electric heating element (140, 150, 240a, 240b, 250a, 250b, 340a, 340b, 350a, 350b, 540, 640, 650, 740, 750), which is galvanically separated from the first electric heating element, wound thereon. The second flat winding support with wound second electric heating element is inserted into the housing electrically insulated against the housing.

Abstract: An electric heater assembly suitable for use with molten metals, the heater employing improved heat transfer media.

Abstract: A sheathed-element glow plug for placement in the combustion chamber of an air-compressing internal combustion engine includes a sheath, a connector element for the glow current, and a tube secured in the sheath sealed at its end facing away from the sheath. A wire filament arrangement is embedded in insulating material within the part of the tube which protrudes from the sheath. The tube functions as a glow pencil. The sheath is manufactured using a first part, a second part, and an intermediate piece. The length of the intermediate piece is adjusted depending on the desired length of the sheathed-element glow plug.

Abstract: An electrically heated spray nozzle, such as for spraying plastics, includes a highly compressed tubular heating body wound about a spray nozzle as a plurality of coil windings. The heating body has a tubular steel inner jacket containing a pair of spaced electric heating elements embedded in a high compressed powdered insulating material. A copper outer jacket encases the inner jacket and a hard solder connection joint as least as broad as the diameter of the outer jacket connects the outer jacket and hence the heating body to the nozzle. The number of coil windings per unit length of nozzle body is larger near the ends of the nozzle than near its middle. A steel wear-resistant lining may cover the surface of the nozzle bore.

Abstract: An electrical heat generating system of the skin effect current type having a two part elongate hollow element of ferromagnetic material enclosing an insulated energizing conductor. One part of the hollow element comprises an open face channel having two elongated, coextensive, spaced longitudinal edges and the other part covers the open face of the channel. When the conductor is energized by an alternating current, the magnetic field generated thereby is confined within the interior of the hollow element to produce heat without any current passing through and along the outer peripheral surfaces thereof.