Abstract: An electric power resistor has a stack of a plurality of resistor plates of metal. Each resistor plate has at least one meandering structure which is formed by a plurality of alternately mutually connected transverse webs. Resistor plates following one another in the stack direction are rotated by 90° with respect to one another.

Abstract: Disclosed herein is a porous ceramic heating element wherein 0.08 to 1.00 wt % of a foaming agent is added in 99.00 to 99.92 wt % of a mixture of an inorganic material, a binder, a conductive material, a hardener, a bonding agent and a dispersion medium and mixed with the mixture. The bonding strength of porous foam formed in the ceramic heating element is increased, thereby providing an effect that the entire structure is hardened.

Abstract: The present invention provides a staple for a heating unit. In one embodiment, the heating unit has a base, a first insulation layer, a second insulation layer, and a heating element. The first insulation layer has a top surface and a bottom surface. The heating element rests on the top surface of the first insulation layer. The staple includes a base and a plurality of legs. The base is capable of straddling a portion of the heating element. At least one of the plurality of legs is capable of extending through the top and bottom surfaces of the first insulation layer. A portion of the leg extending through the bottom surface of the first insulation layer is capable of being rolled to form a foot. The second insulation layer is located between the bottom surface of the first insulation layer and the base. In another embodiment, the present invention includes a staple for a heating unit having an insulation layer and a heating element. The heating element rests on the top surface of the insulation layer.

Abstract: An electric heating device includes a flexible resistor ribbon, a plurality of sections of electroconductive coating attached to the resistor ribbon at preset intervals, and connector contacts coupled to the resistor ribbon for enabling connection of a power source to the resistor ribbon. The resistor ribbon has a high specific impedance. The flexible resistor ribbon is attached to a rigid or flexible flat base panel for incorporation into a building as a floor, wall or ceiling panel. Layers of electric insulation are attached to the base so as to sandwich the flexible resistor ribbon. Where the resistor ribbon is bent back on itself, for example, to form a snaking configuration, a strip of two-sided adhesive tape is attached to the layers of electric insulation and to the ribbon at multiple spaced points.

Abstract: A continuous ribbon resistor element having a plurality of conjunctive lengths alternately connected by reflexes is supported in a frame comprised of silicon bonded laminated mica. The ribbon elements are formed with a single, flat convolution center offset to one side of an original plane and lateral portions offset to an opposite side of the plane, joined to the center offset by transition portions such that the centroid for any transverse cross section lies on the original plane. The offsets originate at flat end portions near the reflexes and have maximum offset intermediate the ends. Metal members are received in openings of the laminated mica insulators to receive threaded fasteners when attaching an insulator in edge-wise relationship to another. Thermally conductive termination connections are brought outside the frame and airflow passageway to remove from the passageway the additional heat otherwise absorbed by the terminals.

Abstract: A serpentine etched foil heater has a segmented serpentine conductor group made up of a plurality of spaced-apart elongated serpentine conductive strips that are connected in parallel and are everywhere aligned with each other. Advantageously, central conductive strips are wider than are conductive strips along the edges. Further advantageously, the conductive strips are bridged by conductive regions that extend along lines of constant voltage. This makes it possible to handle the heater element without causing it to become tangled. The heater is especially suitable for low voltage applications.

Abstract: A heat dissipating fabricated resistor grid for the dynamic braking of electric motors has a zigzag resistor supported by insulating members within a frame. The zigzag resistor is made up of a plurality of resistor elements formed from sheet metal, each element containing at least one "U" shaped bend, that are connected by welded joints between the legs of adjacent resistor elements. The resistor elements may be embossed to stiffen them. Various types of clips may be utilized to hold the tabs and the resistor elements together to facilitate welding and the clips are welded to the other components and become part of the zigzag resistor. Various types of connecting joints are provided to connect the zigzag resistor to the insulating members. Various types of securing devices are provided to secure the insulating members to a supporting metal frame.

Abstract: The invention relates to a method of manufacturing a heating element from a flat metal foil blank in which strips (1) are formed whose ends (2) are interconnected by connecting portions (3, 4) with alternate connecting portions disposed at opposite ends of the strips so as to form a meandering pattern and to a heating appliance incorporating such a heating element. In order to make such a foil heating element suitable for use in appliances in which an air stream to be heated passes over the foil heating element the connecting portions (3, 4) are bent in such a way that the strips (1) are tilted out of the plane of the foil blank. Preferably the strips are disposed an an angle .alpha. between 45.degree. and 90.degree. relative to the plane.

Abstract: A grid assembly for converting electrical energy to heat and then dissipating same. A plurality of parallel grid members include outwardly extending legs received in holes provided on mutually facing surfaces on polyester glass insulator members. The grid members are arranged in a continuous serpentine path from an input to an output terminal. The grid members are of sheet metal construction with the cylindrical legs formed by a radiused sheet metal configured leg portion of one grid member positioned adjacent an identical configured and mutually opposed leg portion of an adjacent grid member. The main body of each grid member extends from the legs through a flat portion and then through a diverging end portion spacing the main bodies of the grid members apart. In an alternate embodiment, the grid members are arranged with different lengths to provide a particular sized and configured grid assembly.

Abstract: Plastic web to be fed into opposite dies for forming articles must be heated and softened by heater means in front of the forming machine, even if said machine is combined with an extruder supplying said plastic web. The invention provides a radiant heater adapted to be sensitively responsive to manual or automatic control so as to more suitably regulate a temperature of the plastic web in comparison with the conventional heater comprising quartz tubes each having a coiled nichrome wire. The heater of the invention comprises an extended thin nichrome plate arranged in zig-zag on a table plate.

Abstract: These resistors are obtained from conductive sheet material, for example metal sheet material (usually referred to as "grids") in which additional plates are provided in order to distribute the current density and consequently to predetermine the temperature and strain distributions caused on the resistor during load conditions.

Abstract: A resistance element capable of withstanding a high voltage is formed through impurity diffusion in a single crystal island of a semiconductor integrated circuit substrate. The resistance element includes a resistive region formed in an exposed surface of the single crystal island and folded reciprocatively by at least one and a half turns in a planar zigzag-like pattern. The pitch at which the resistive region is folded is decreased as viewed in the direction in which extension of depletion layer formed within the single crystal island upon application of a voltage between two ends of the resistive region is decreased.

Abstract: Electrical resistor of sheet metal, of the type having two U-shaped stiffeners mounted on the edges of the resistor.It is made by cutting a sheet to constitute conductors (6) going from one edge to the other of the resistor, which are connected two by two in at least one node (7) located between the edges.

Abstract: An electrical network containing at least one electric resistor, includes a support foil and at least one resistance layer coating the support foil forming the at least one electric resistor. The support foil and resistance layer are folded along a zig-zag line forming two outer surfaces of the resistance layer. Contact layers are each disposed on a different one of the outer surfaces of the resistance layer, a plastic layer is applied on the contact layers, and outer contact layers each make contact with a different one of the contact layers. A method is also provided for producing the same.

Abstract: An electric heating element for electric resistance furnace comprises a plurality of heater frames which consist of conductive strip material having a sectional shape selected from leg angle-section, channel-section, lip-section, T-section, U-section, V-section, I-section, H-section, Z-section, and W-section and having electric resistance. The heater frames have a configuration coinciding with a sectional shape of an inner wall of a heating chamber of the furnace, and are made and arranged to have an opening portion. Conductive connecting rods are adapted to connect both ends of each of said heater frames to alternatively adjacent ends of adjacent heater frames so as to constitute a single wire resistance body of said heater frames, and a conductive rod connected with one end of said wire resistance body is arranged to pass through said opening portion of said heater frames and facing a power source terminal together with the other end of said wire resistance body.