Abstract: A resistor assembly and method of assembling a resistor to a coupling, comprises providing a resistor having a first end and a second end, the resistor being tubular in shape and providing a coupling housing having an open end for receiving the first end of the resistor, the coupling housing including a sealing member, a retainer, and a support washer. The retainer is interposed between the support washer and sealing member. The first end of the resistor is inserted into the open end of the coupling housing. The tube is rotated within the coupling housing so that the resistor is in sealing engagement with the sealing member and retained by retaining member.

Abstract: A resistor apparatus for containing broken pieces of an overheated resistor body is provided. The resistor apparatus includes a resistor body and a first and second lead wire electrically connected to opposite sides of the core. A gas permeable containment casing substantially encloses the resistor body and is fixed to the lead wires by fasteners, therefore maintaining the containment casing in a position substantially enclosing the resistor body. In the event that the resistor overheats and the resistor body breaks, the containment casing is maintained in a position to contain any pieces of the overheated resistor that break away, while allowing any gasses to escape, therefore preventing explosion of the containment casing and damage to surrounding apparatuses.

Abstract: A resistor apparatus for containing broken pieces of an overheated resistor body is provided. The resistor apparatus includes a resistor body and a first and second lead wire electrically connected to opposite sides of the core. A gas permeable containment casing substantially encloses the resistor body and is fixed to the lead wires by fasteners, therefore maintaining the containment casing in a position substantially enclosing the resistor body. In the event that the resistor overheats and the resistor body breaks, the containment casing is maintained in a position to contain any pieces of the overheated resistor that break away, while allowing any gasses to escape, therefore preventing explosion of the containment casing and damage to surrounding apparatuses.

Abstract: A radiant tube heating assembly for a furnace, which assembly combines the features of a heating element utilizing the latest powder metallurgical technology, improved ceramic spacers and staggered weld joints to thereby enable higher efficiency and heating temperatures. Further, the assembly enables a higher temperature element system, ease of manufacture and reduced failures due to shorts or arc over at the weld joints.

Abstract: A modular type heating unit or assembly having particular utility for use in a high temperature electric furnace, preferably in a group arrangement, comprises an insulating fibrous refractory block, a pair of spaced apart support rods, inner and outer support tubes and a heating element. Both the heating element and the support rods are formed of alloys to enable operation at relatively high temperatures. By utilizing this concept of modular element/insulation units, furnaces can be operated at relatively higher temperatures than is currently possible for exposed electrical element type furnaces.

Abstract: A hot plate formed by a hub from which spokes radially extend in a horizontal plane, the spokes being formed by flat strips of refractory fibrous or woven material, each positioned in a vertical plane and having upper edges in which downwardly extending notches are formed, and molybdenum disilicide wire in the form of a flat spiral having convolutions with portions inserted in the slots, the wire having terminating ends, and means for connecting the ends with electric current.

Abstract: A high temperature melting furnace including a fibrous refractory cylindrical shell with a fibrous refractory top and a bottom composed of similar material. Heating is provided by molybdenum disilicide resistance wire loops hanging inside the shell. The furnace top has a removable closure plug for access to the furnace when in operation and the furnace bottom has a verticle charging hole with a removable pedestal insertable therein.

Abstract: A horizontal porcupine coil of electric resistance heating wire is supported against sagging by two superimposed coil-center ceramic tubes containing a conductor for one end of the coil. If one tube cracks it is improbable that the other would crack in the same place, and this keeps to a minimum the possibility of short-circuiting between the conductor and coil.

Abstract: An electric resistance heating element of the hairpin type is provided by a molybdenum disilicide resistance wire loop transversely connected to molybdenum disilicide terminals. The resistance wire is sandwiched between the ends of two pieces of terminal wire and the ends of these pieces are butt welded together on the resistance wire, to form each terminal.

Abstract: An electric hot plate has a molybdenum disilicide resistance wire heating element spaced above a fibrous refractory pad by wire supports and spaced below a transparent glass plate forming a cooking surface. The pad has a smooth top surface, the wire is looped back and forth sinuously or possibly spirally coiled to form a layer which is parallel with the pad surface and the glass plate, and the wire is designed to operate at temperatures preferably of from about 2300.degree. to 2500.degree. F. or higher, at which temperatures the pad surface has been found to be effective for diffusely reflecting upwardly the wire heat radiation.

Abstract: An electric resistance heating element is formed by a molybdenum disilicide wire loop formed by separate lengths of the wire having ends positioned together and butt welded to the end of a molybdenum disilicide connecting wire of larger diameter than that of the lengths. The lengths diverge from each other so they are electrically separated. Electrical connections with the free ends of the separate lengths of wire can provide for electrically powering the loop.

Abstract: An electric resistance heating element of the hairpin type is provided by a molybdenum disilicide resistance wire loop transversely connected to molybdenum disilicide terminals. The resistance wire is sandwiched between the ends of two pieces of terminal wire and the ends of these pieces are butt welded together on the resistance wire, to form each terminal.

Abstract: A molybdenum disilicide electric resistance wire powered to heat to temperatures of from 2000.degree. to 2600.degree. F. has one or more supports directly contacting the resistance wire and made of an Fe-Cr-Al alloy having its surface covered by oxide preventing chemical reaction between the wire and the support.

Abstract: A coil assembly is formed by an elastic metal wire helical extension spring coil having convolutions resiliently urged towards each other and held apart by spacers pinched between the convolutions and held there by the spring-back of the convolutions. The spacers can interspace the coil convolutions and be made to extend radially inwardly and outwardly beyond the inside and outside of the coil, so as to radially space the coil from a coil center and the inside of a tubular casing enclosing the coil. In this way a tubular radiant heater can be made by using electric resistance wire to form the coil and making the spacers from refractory insulating material.

Abstract: A porcupine wire coil of electric resistance wire is positioned in a tube having an electrically insulating inside in which the peaks or looped ends of the coil convolutions are embedded so as to hold the coil convolutions spaced from each other. When the coil is energized, fluid flowed through the tube can be heated.

Abstract: A wire-coiling machine has a non-rotating mandrel having a coil-starting portion which declines to a forwardly extending coiling portion. Means revolving about the coil-starting portion continuously feeds and winds under back-tension the wire to be coiled on this coil-starting portion, the latter having a declination and forward extent causing the wire while winding thereon to continuously slide radially downwardly and axially forwardly so as to feed and form coil convolutions on the mandrel's coiling portion while forcing the latter to continuously feed forwardly so as to continuously produce a coil in the form of a non-rotating coil. The mandrel can be very short with a free terminating end from which the non-rotating coil feeds continuously for easy collecting or processing operations.

Abstract: A high melting temperature metal, casting mold is made of sheet metal embedded in a supporting mass of refractory particles preventing deformation of the sheet metal under the weight of the cast metal and conducting heat from the sheet metal at a rate preventing complete melting of the sheet metal.