Abstract: A multiple stage open coil electrical resistance heater uses a unique coil configuration on either side of a dividing support plate so that the air passing through the heater is heated uniformly when one or more stages of the heater are energized. The coil configuration also creates a termination zone on one side of the heater so that the terminations of the coils can be situated on the cool side of the heater. The heater coils also includes specially configured terminals to facilitate connection to power using an elongated member such as a stud or bolt.

Abstract: An open coil electrical resistance heater uses a number of offset insulators to support the coil of the heater. The offset insulators configure the run of coil in a sinusoidal shape to hold the insulators in a more secure manner and reduce vibration and noise generation during heat operation. The sinusoidal configuration of the coil also reduces the problem of shadowing of portions of the resistance wire coil.

Abstract: Radiation module for thermal or UV irradiation processing procedures with a large number of radiation sources essentially adjacent and parallel to one another for electromagnetic radiation whose main effective range is in the UV spectrum, visible spectrum, and/or near infrared (NIR) part of the spectrum, particularly at wavelengths between 250 nm and 1.5 ?m, whereby each of the radiation sources possesses an elongated central section, two bent ends, and two bent sections connecting the ends with the central section, and a reflector and cooler body bearing the radiation sources, whereby the reflector and cooler body possesses two end reflector sections assigned to the bent sections of the radiation source from the straight elongated main section to the ends formed as one piece.

Abstract: An improved plastic bag sealing apparatus comprised of an improved resilient planar heater formed of a heating wire embedded in a resilient silicon rubber material. The heater is shaped to conform to the flat planar surface of a T-bar shaped heating element, and clamped in place with insulators to provide maximum transfer of heat to a heating edge formed by the web portion of the T-bar. In an optional configuration the heater is in the form of a tubular rod seated in a channel in the T-bar directly above the heating edge for transferring maximum heat to the heating edge. In another optional embodiment, the tubular rod heater is a brass rod covered with intermediate insulating sleeves and spirally wound heating wire. In the latter embodiment the tubular rod heater is inserted in a passageway through T-bar shaped heating element and sealed with a potting compound.

Abstract: An infrared radiation lamp that includes an electrically heated filament and a reflector. The filament is a high temperature element that is wound to a helical configuration. The helical filament is free-standing at operating temperatures, and it is positioned in an open reflector made from a ceramic material.

Abstract: An open coil electric heater comprising a rigid support frame composed of a pair of longitudinally extending, laterally spaced members, with cross members between and secured to the longitudinal members. The cross members carry ceramic insulator members which are detachably connected to the cross members. Each insulator member has an end formed with a slot at an acute angle to the side walls of the insulator member to pass a portion of a convolution of an electrical wire coil. Hook-like projections form a transverse indentation at the base of the slot to detachably hold the portion of the wire om the insulator member. The portion of the wire is secured to the insulator members in an expeditious manner and without the use of tools by twisting the wire portion so that the wire portion is aligned sufficiently with the slot to enable the coil to freely pass into said slot.

Abstract: A heater coil for an electron tube includes a spiral wire which is double wound to be cylindrical, and a connection wire which is formed on an upper face of the spiral wire in a horizontal plane. The connection wire is shaped to have at least two bent portions on the same plane.

Abstract: A trimmable resistor network including a plurality of series-connected sections each including a plurality of paralleled link resistors each capable of being cut so as to be eliminated from the network, the paralleled resistors in each section having resistance values such that the section resistance changes by at least approximately integral multiples of a fixed amount when the resistors are cut.

Abstract: A protection arrangement for a high voltage tube includes a low inductance disk resistor connected in series with the anode of the tube. When an electrical discharge occurs within the tube, the increased anode current flows through the resistor which absorbs much of the potentially harmful energy surge. The resistor is a disk resistor having two counter-wound planar spirals of resistance wire electrically connected in parallel and counter-wound with respect to one another. Connection arrangements are provided to both electrically and mechanically connect the resistor to the high voltage tube.

Abstract: A radiant heater with partly embedded and otherwise projecting heating coils (16) is produced in that the coils (16) are placed in grooves (14) of a tool or mould (13), the interior of the heating coils is partly filled with a filling material (17) and then the dry, pourable insulating material is pressed thereon. Thus, the filling material forms a counter-die and is removed on taking the compressed insulator (21) out of apparatus (11) in that it drops between the heating coils.

Abstract: A resistor grid for dynamic braking of diesel electric locomotives has a rigid frame comprising outer metal side pieces and metal dividers within the frame between which are positioned columns of fan-folded resistor ribbon. The dividers carry support plates having transverse aligned tabs along both sides fixed normal to the support plate, each tab having a notch in its inside edge, supported plates which slide in those slots longitudinally, the supported plates and the folds of the resistor ribbon carrying studs and bushings which interfit by movement normal to those plates.

Abstract: A support for an electric heating element comprises a former of generally cylindrical shape, made of a heat resisting material and having a longitudinal core from which extend spaced ribs that support an outer wall. Portions of the outer wall and of the ribs are omitted along a helical path around the core to provide a mount for an electric heating element. A heating element assembly including the support and the heating element is mounted in a hot air gun.

Abstract: Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, for brazing, stress relieving, and other applications. Has a machined mandrel of boron nitride and electrical resistance wire leads that have reduced electrical resistance for reduced heat generation by the leads. The leads preferably are braided, to permit the use of cramped connectors.

Abstract: In a glow plug for use in a diesel engine of the type comprising a first helical heating member, a second helical heating member connected to the first heating member and made of material having larger positive resistance temperature coefficient than that of the first heating member, and a sheath enclosing the first and second heating members, the ratio between the length of the first heating member and the sheath diameter is selected to be less than 1.5, and the resistance ratio at normal temperature of the first and second heating members is selected to lie in a range of from 2.5 to 7.0.

Abstract: A radiant heating element for heating a glass ceramic plate carries on a circular insulating support heating elements in the form of wire coils fixed thereto, which are arranged in the form of two parallel spiral paths. Two separately switchable heating conductors are successively arranged in one spiral path, while the third heating conductor is positioned alone in the other spiral path. The heating conductors have different power levels and can be switched to different power stages by a seven-timing switch.

Abstract: Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, having bores as small as 0.75 cm. or less, for brazing, stress relieving, and other applications.

Abstract: A heater rack assembly, of the type which supports an electric heating coil in a pattern of parallel rows in a plane, utilizes double-ended stand-off insulators which are formed wafer-like in the plane. The insulators have, at each end, pairs of hook portions facing each other to provide a throat, which opens into a wire-accommodating slot behind the hook tips, the slot converging toward the center at an angle of 150.degree. or less. Adjacent turns of the coil are to be accommodated within the slot. Its convergence retains within the slot adjacent coil turns which might otherwise escape, requiring for such escape what is in effect a reverse in-plane twisting displacement.

Abstract: A glow plug for use in a diesel engine comprises first and second helical heaters covered with a sheath. The second heater is made of material having larger resistance temperature coefficient than that of the first heater. A gap larger than winding pitches of the two heaters is provided there between and the two heaters are electrically interconnected in the gap.

Abstract: A miniature resistive temperature detector is fabricated by winding wire about a ceramic, or equivalent, cement coated graphite mandrel or form having a greater length than the resulting detector, coating the wire except for the lead portion with a ceramic, or equivalent, cement and cutting the wire and breaking the form to produce the miniature detector. A plurality of miniature detectors may be fabricated on a single form or mandrel with space between each detector to facilitate breaking.

Abstract: An AC resistor attenuator with low parasitic capacitance coupling and, thus, a substantially constant attenuation value over a relatively wide frequency range is disclosed. The AC resistor attenuator comprises a first elongate resistor substantially entirely surrounded by a second elongate resistor. The first and second elongate resistors are thermally matched and have a substantially identical resistance profile. The first and second resistors are connected in series. The other ends of the first and second resistors are connected across the source of the signal to be attenuated. The attenuated signal is obtained at the junction between the first and second resistors. Except in the case where fifty percent (50%) attenuation is to be provided, the higher value resistance of the attenuator forms the first resistor and the lower value forms the second resistor.

Abstract: An electric radiant heater unit for a glass ceramic top cooker includes an inner circular heating coil and an outer annular coil surrounding the circular coil. The two coils are separated by a dividing wall of thermal insulating material and the annular coil is surrounded by a peripheral wall of thermal insulating material. The inner coil may be energized alone or both coils may be energized together. The electrical resistance of the inner and outer coils is such that the watts density within the peripheral wall when both coils are energized is greater than the watts density within the dividing wall when only the inner coil is energized.

Abstract: An improved electrical heating element is constructed to increase the amount of electrical wire per unit space available for plug-type convection heating units. The heating element includes a metal frame structure with a plurality of spaced support elements and a plurality of spaced removable cross bars connected thereto. A plurality of ceramic heater support blocks, each of T-shape in plan, with spaced end faces are arranged end to end and have undercut grooves which receive a cross bar and are interposed between the support elements. A continuous electric resistance heating wire has a series of parallel spaced inverted U-shaped wire sections. The wire sections are arranged in groups. Each block has a support boss of reduced width adjacent one end face adapted to extend between the strands of a section of the heating wire. Each block has a pair of spaced bosses adjacent to its other end face which extend laterally outward of the support boss.

Abstract: A rotating starting resistance for a rotating electrical machine is disclosed. The resistance includes a helicoidal resistance wire that is wound in the shape of a torus, and connected to the rotating shaft of the electrical machine. The resistance wire may be directly fastened to a supporting member by means of a glass fiber cord suitably impregnated with a synthetic resin. The helicoidal nature of the starting resistance permits efficient cooling, and allows minimization of the overall height of the resistance. The resistance wire, which is wound in the shape of a helicoidal torus, may be reinforced at either the inner or outer diameter of the torus.

Abstract: An open coil electric heater comprising a rigid support frame composed of a pair of longitudinally extending, laterally spaced members, with cross members between and secured to the longitudinal members. The cross members carry ceramic coil supports which are detachably connected to the cross members. Each coil support has an end formed with a cross slot to pass a part of a convolution of a coil and hook-like projections are formed on opposite sides of a coil support and are cooperable with the coil convolution part to detachably hold the same to the coil support. The heating coil is secured to the coil supports in expeditious manner and without the use of tools by twisting the coil so that said convolution part is aligned sufficiently with said cross slot to enable said part to be seated within said slot. The coil is then permitted to spring back so that the convolution fits against opposite side faces of said coil support and held in position by said hook-like projections.

Abstract: This specification discloses a cut-in resistance for motor vehicle heating fans with a first resistance wire winding which can be cut into an electric fan motor either alone or in series with a second resistance wire winding. The first winding is arranged in the interior of a ceramic tube and the second winding is arranged on the outside of the ceramic tube. The ceramic tube is retained solely by the ends of the resistance wires which are passed upwards to a ceramic plate and clamped by flat plug contacts. This produces a compact arrangement wherein the ceramic material can safely store generated heat without danger of heat damage to adjacent plastic components.

Abstract: An improved electrical heating element is constructed in such a manner as to increase the amount of electrical wire per unit space available for plug-type convection heating units. The plug uses a rectangular-shaped frame which has a plurality of spool covered rods evenly spaced along the length of the frames and extending across the width. The spools are slidably attached over the rods and have an insulated spacer on each side of the spool. The heating wire has alternate coiled and straight sections and is wound over and held to each spool by a retention wire and a groove in the spool. The rods are spaced at such a distance from each other that there is a straight section of heating wire at each spool with the coiled sections located between adjacent rods.

Abstract: A heavy-duty precision wire-wound alternating-current resistor comprises a capsule filled with a liquid dielectric formed of a low-viscosity liquid perfluorinated organic compound. Within the capsule of the resistor there is arranged a sectionalized bobbin made from a dielectric material chemically resistant to the liquid perfluorinated organic compound. The sectionalized bobbin carries a resistance element with a clearance therebetween dimensioned so as to exceed by at least an order of magnitude the change in the bobbin diameter due to the magnitude of thermal expansion of the material of the sectionalized bobbin in order to provide the circulation of the liquid dielectric therein.

Abstract: A fault current limiting resistor for high energy dissipation includes a frustro-conical support structure where the resistor wire is wound on the support structure in the form of a three dimensional spiral. This provides optimum voltage clearances even when the wire may sag due to thermal expansion.

Abstract: A precision resistor wherein the resistor wire is deposited in a sinuous pattern on the adhesive surface of a thin, flexible tape of electrical insulating material. In winding the tape onto a multibobbin coil form the intermediate flanges of the coil form have a flat portion of reduced radius. A coil of tape is wound on one bobbin with the adhesive side against the bobbin and is passed over the flat portion of an intermediate flange. At the crossover the tape is pressed to conform to the shape of the flange and then passed around the axial body of the adjacent bobbin to commence the winding of the next coil of tape on the adjacent bobbin.

Abstract: An electric resistance heating element, comprising at least two elongated dielectric bodies, each having a plurality of openings extending longitudinally thereon in radially displaced, parallel relation. Three metal pins fit into openings in the dielectric bodies and at least certain maintain the latter in longitudinally aligned relation. A resistance wire is wound on each of the bodies, each wire having longitudinally spaced terminals. One of the terminals of each resistance wire is electrically connected to one pin; the opposite terminal of one resistance wire is electrically connected to a second pin; and the opposite terminal of the other resistance wire is electrically connected to the third pin, whereby the one pin serves as a common electrical connection for both resistance wires, and the second and third pins serve as separate electrical connections to the respective resistance wires, whereby separate electrical circuits may be established within the heating element.

Abstract: An elongated electrical heating element comprises intertwisted helical strands of metal wire. Some of the strands extend the full length of the heating element and other strands extend predetermined shorter distances to provide two or more zones having differing electric resistances and therefore differing operating temperatures.