Abstract: An axial resistance sheathed heater is presented. The axial resistance sheathed heater includes a retaining sheath having a first end and a second end and a resistance wire completely disposed within the retaining sheath. The heater further includes a first conductor rod partially disposed within the retaining sheath and extending beyond the first end of the retaining sheath, the first conductor rod in direct electrical communication and direct mechanical communication with the resistance wire; and a second conductor rod partially disposed within said retaining sheath and extending beyond the second end of the retaining sheath, the second conductor rod in direct electrical communication and direct mechanical communication with the resistance wire. The resistance wire, the first conductor rod and the second conductor rod comprise a circuit achieving a power to voltage rating of about 5000:24.

Abstract: An insulating support structure for a helical wire heating coil for an electric resistance heating element includes a plurality of insulating standoff members supported by a metallic support frame. The insulating standoffs each include a pair of wedge portions that are used to separate the individual convolutions of the helical wire heating coil. Located inwardly from each of the wedge portions are a pair of V-shaped coil grooves sized to receive a portion of an individual convolution of the helical wire heating coil. A retainer tab extends into and forms one surface of the coil groove such that the wire heating coil contacts the retainer tab and a pair of contact surfaces that define the coil groove. The insulating standoffs are each supported by an arm contained on the support frame. Each of the arms includes a pair of tines which combine to form an open slot within the arm. The insulating standoff is captured between the tines by a pair of locking projections on the outer end of the tines.

Abstract: An insulating support structure for a helical wire heating coil for an electric resistance heating element includes a plurality of insulating standoff members supported by a metallic support frame. The insulating standoffs each include a pair of wedge portions that are used to separate the individual convolutions of the helical wire heating coil. Located inwardly from each of the wedge portions are a pair of V-shaped coil grooves sized to receive a portion of an individual convolution of the helical wire heating coil. A retainer tab extends into and forms one surface of the coil groove such that the wire heating coil contacts the retainer tab and a pair of contact surfaces that define the coil groove. The insulating standoffs are each supported by an arm contained on the support frame. Each of the arms includes a pair of tines which combine to form an open slot within the arm. The insulating standoff is captured between the tines by a pair of locking projections on the outer end of the tines.

Abstract: An insulating support structure for a helical wire heating coil for an electric resistance heating element includes a plurality of insulating standoff members supported by a metallic support frame. The insulating standoffs each include a pair of wedge portions that are used to separate the individual convolutions of the helical wire heating coil. Located inwardly from each of the wedge portions are a pair of V-shaped coil grooves sized to receive a portion of an individual convolution of the helical wire heating coil. A retainer tab extends into the coil groove such that the wire heating coil contacts the retainer tab and a pair of contact surfaces that define the coil groove. The insulating standoffs are each supported by an arm contained on the support frame. Each of the arms includes a pair of tines which combine to form an open slot within the arm. The insulating standoff is captured between the tines by a pair of locking projections on the outer end of the tines.

Abstract: A heated handgrip is disclosed wherein a tubular sleeve is overlayed by a sheath with a heating wire sandwiched between the sleeve and the sheath.The sheath and the sleeve are connected threadedly and lock means are provided to preclude relative motion between the sheath and the sleeve.

Abstract: A heated hand grip is disclosed having an internal sleeve and an external protective jacket where the sleeve is formed with external, helical lands and grooves about which a strand of resistance wire is sewed and anchored snugly. The disclosure includes a method of manufacturing the heated hand grip.

Abstract: An improved heater assembly and method for applying a brazing heat across a selected longitudinal section of a tube is disclosed herein. The heater assembly generally comprises a heater mandrel having an electrical resistance heating element coiled thereabout, and a support mandrel for supporting and centering this heating element. The heater mandrel further includes a means for directing a flow of inert gas in the space between the coiled heating element and the inner walls of the tube being brazed in order to purge this space of ambient atmospheric oxygen and prevent the heater mandrel from oxidizing. The support mandrel includes a centering means in the form of two roller assemblies, each of which has three spring-loaded rollers equidistantly spaced 120.degree. around its diameter. In the method of the invention, the heater mandrel is inserted into the tube and slid across the longitudinal section to be brazed.

Abstract: Both an apparatus and a process for accurately applying a correct amount of brazing heat to a conduit are disclosed herein. The apparatus generally comprises a mandrel including an electrical resistance wire heating element and a heat sensor for sensing the temperature of the inside walls of the conduit which were heated. The mandrel is preferably formed from a refractory material, and the heat sensor is located beneath the surface of the mandrel in order to insulate it from heat radiated from the electrical resistance wire wound about the mandrel body. The mandrel further includes an opening in the portion of the mandrel which surrounds the heat sensor in order that the sensor may be selectively exposed to a section of conduit to which heat was applied by sliding the mandrel to a position which aligns the opening with the wall of the heated conduit. The temperature of the conduit may then be determined as a function of the radiant heat received by the heat sensor.

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: A heating coil assembly for use in an air blower device has an annular support element, a first end cap, a core having a heating coil spirally wound thereon, a sleeve surrounding the coil and core, and a second end cap. All components have a centrally disposed non-circular bore therein for receiving a heavy gauge non-circular wire retainer, swaged at one end, which extends through the entire assembly and is retained by a press washer at an opposite end. The interior of the sleeve is spaced from the coil forming an axial channel for air flow over the coil. Axial openings in the end caps form air inlets and outlets for the channel. The coil has several leads, at least one of which extends through an axial opening in one of the end caps. The heating coil assembly has a small number of components, which are easily assembled and simultaneously axially and radially positioned and retained relative to each other by the wire retainer.

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: 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 cylindrical core of a ceramic such as alumina (Al.sub.2 O.sub.3) has grooves in the form of a double lead thread. A coil of Nichrome V is placed in the grooves, starting in one lead of the thread and returning in the other. A split ring of a ceramic such as beryllia surrounds the core. The heater is enclosed in a housing of a metal such as Inconel 600. The entire cartridge is only one inch long and 3/16 inch diameter. It is used as a catalyst bed heater for a satellite thruster.

Abstract: A glow plug for preheating the combustion chamber of a diesel engine. The glow plug has a heat generating portion and a mounting portion. The heat generating portion is provided with a ceramic central electrode made of an electrically insulating material and provided with at least one spiral screw-thread groove formed in the outer peripheral surface thereof. A ceramic electric resistor serving as a heat generating member is disposed in the groove. The electric resistor is made of TiC or SiC with or without addition of Al.sub.2 O.sub.3.

Abstract: A furnace is described which comprises an insulated muffle comprising a ceramic fibrous body into which work pieces may be directly introduced through an opening. A closure member is arranged to close the opening, and means are provided for energizing a coiled heating element disposed in an open channel within the body and for controlling the rate at which the muffle is heated. The opening is arranged at the top of the muffle so as to ensure its rapid cooling subsequent to removal of the closure member therefrom. To enable the muffle to withstand rapid cooling, and in particular to retain the heating element in position, a plurality of strips of ceramic fibrous material are cemented diagonally across the top of the open channel. The closure member may be latched in the closed position by atmospheric pressure as the result of evacuating the interior of the furnace.

Abstract: An insulating core including a helical groove for use in a coil form, U-shaped grooves for use in an insulator in compression and diametrical holes for use in an insulator in tension. The wire used in the system is part of an antenna system.

Abstract: A heating coil assembly for use in an air blower device has an annular support element, a first end cap, a core having a heating coil spirally wound thereon, a sleeve surrounding the coil and core, and a second end cap. All components have a centrally disposed non-circular bore therein for receiving a heavy gauge non-circular wire retainer, swaged at one end, which extends through the entire assembly and is retained by a press washer at an opposite end. The interior of the sleeve is spaced from the coil forming an axial channel for air flow over the coil. Axial openings in the end caps form air inlets and outlets for the channel. The coil has several leads, at least one of which extends through an axial opening in one of the end caps. The heating coil assembly has a small number of components, which are easily assembled and simultaneously axially and radially positioned and retained relative to each other by the wire retainer.