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 heating cable for use with an electric underblanket the cable being of the type in which a sensor wire is employed coextensive with a heater wire and separated by a layer of meltable insulating material so that overheat conditions are sensed by contact between the sensor wire and the heater. A number of helically wound coextensive wires cooperate with switching means to provide overheat temperature sensing at various wattage levels of heating.

Abstract: A PTC heater assembly comprises at least one PTC heater surrounded by an envelope of high thermal conductivity, thus greatly increasing the power output of the heater under operating conditions. In a preferred assembly a strip heater, comprising (i) an elongate strip of a conductive polymer PTC composition, (ii) electrodes embedded in said strip, and (iii) an insulating jacket, is sandwiched between a pair of metal, e.g. aluminum, sheets.

Abstract: In a cooking and heating apparatus, a device for warning personnel of dangerously hot temperature is incorporated within the structure of a thermostat which has a switch for regulating the flow of electric current to a heating element of the apparatus. The thermostat includes a push rod mechanically coupled to a finger-like termination which extends through an aperture in an arm of the regulating switch to engage the arm of a further switch used in activating a warning indication. A collar on the termination engages the arm of the regulating switch subsequent to the activation of the further switch by the rod. The rod expands with increasing temperature and, thereby, initiates the warning at a lower temperature than the temperature of the power cut off by the regulating switch.

Abstract: A heating device for heating an object with a heating element composed of ceramic particles having a positive temperature coefficient of resistance dispersed in a binder.

Abstract: A self-regulating heating article comprising a layer of material exhibiting a positive temperature coefficient of resistance (PTC) and said PTC layer having at least partially contiguous therewith at least one layer of constant wattage output material. The article operates such that when connected to an electric power source, the current flows through at least a portion of the thickness of the PTC layer and of the constant wattage layer. In a preferred embodiment, upon heating the article, a change in dimensions as well as activation of an adhesive occurs.

Abstract: An electric heater for insertion into a small container and comprising a heater core, a heater can having one closed and one open end in which the heater core is operatively embedded, a heater coil carried by said heater core only on a portion thereof adjacent the closed end of the can, a thermostat extending transversely of said heater core adjacent the open end of the heater can, the thermostat being insulated from the heater core.

Abstract: A sheet heater including a substrate, a semi-conductor pattern (typically of colloidal graphite) having a pair of parallel, spaced-apart, longitudinally-extending stripes and a central portion extending between and electrically connected to the stripes, and a pair of parallel, spaced-apart, longitudinally-extending conductors one of which overlies and engages each of the stripes. Each conductor is significantly wider than the underlying stripe of the semi-conductor pattern, and includes a longitudinally extending strip portions along the inner and outer edges of the conductor, and a plurality of longitudinally-spaced openings located therebetween. The strip portion at the inner edge of the conductor overlies and engages a respective stripe; and a sealing layer of insulating material overlies the respective conductor and is sealed to the substrate along the inner and outer edges of the conductor and through the longitudinally spaced openings.

Abstract: A heat sensitive cable operable over a temperature range of between approximately -20.degree. F. and 1650.degree. F. The cable includes a tubular metallic sheath which is substantially temperature resistant and moisture impervious. It also includes a mass of compacted insulation material filling the sheath and having an insulation resistance variable with temperature in the range of between approximately 100 and 50,000 ohms. The cable further includes at least one thermoelectric conductor positioned within the insulation material filling the sheath. A method of manufacturing the cable includes the step of preparing the insulation material and advancing the thermoelectric conductor through a given region. It also includes the step of advancing a strip of flat metal material past apparatus for forming and welding a tubular sheath surrounding the given region.

Abstract: A heating cord comprises bendable electric heating wire and nonconductive fiber. A net type heater is formed from the heating cords. Common power source terminals comprising a plurality of bendable conductors are fixed at both sides of the net type heater and are connected to the electric heating wire thereof.

Abstract: The invention comprises a safety lighter for providing a flame for lighting camp fires, cooking stoves, heaters, lanterns, and the like. The safety lighter has a housing for a fuel container and an electric igniting device, and an extension tube, mounted to the forward end of the housing, that is pivotable from a folded position to an extended position, wherein a flame can be provided at its end remote from the user's hand. The housing has a recess in which a push-button is positioned for actuating the providing of fuel and the igniting device simultaneously. When the extension tube is folded, it lies parallel to the housing over the recess and the push-button so that the lighter cannot be accidentally ignited.

Abstract: Termination apparatus for elongate heaters which have an outer metal sheath and which are designed for use in hazardous environments. The apparatus comprises a junction box within which the heater is terminated and which has an entry port through which the heater enters the junction box. Secured to the entry port is a connection member comprising first and second compression members which surround a heater passing through the entry port and which define between them a chamber. Within the chamber is a grommet which is composed of lead or another deformable metal. The compression members can be drawn together, thus reducing the size of the chamber between them and deforming the grommet into close conformity with the metal sheath of the heater. In this way, if flames are generated within the junction box, they cannot ignite explosive gases surrounding the junction box.

Abstract: An electrical heating fabric has a warp composed of non-conductive threads, and selvedges which include plural lead wires. In the weft direction the fabric has both non-conductive threads and conductive wires. The different types of weft material are arranged in successive strips disposed transversely to the warp. First strips have non-conductive weft threads only. Second strips additionally have conductive weft wires. The strips are arranged alternately. The weft wires are all discrete, and their two ends are either in simple contact with the selvedge lead wires or are interwoven therewith.

Abstract: A fixing roller for a fixing unit for a copying machine has a heater disposed within an aluminum cylinder. A pair of stainless steel, U-shaped plates, which have holes cut in their bottoms, are fitted into opposite end portions of the cylinder to hold the heater and to utilize the heat generated thereby. A pair of bearings, which have outer races made of heat-resistant resin, are fitted into the opposite end portions of the cylinder under pressure to support the cylinder so that the outer races and the cylinder turn as one unit.

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: A solid-body heating unit used for the warmth preservation, heating and heat treatment, more particularly, for surface heater for plates or patterns, has a refractory base overlaid with an electroconductive layer, a protective layer overlaying the electroconductive layer and a power supply for passing electric current through the electroconductive layer, whereby the surface temperature of the plates or patterns is controllable.

Abstract: An arrangement for welding together molded members consisting essentially of thermoplastic materials having abutting surfaces which extend generally parallel to each other at which a welding connection is made by electrical heat conductors located at the abutting surfaces. The electrical heat conductors are electrically activated to effect a welding operation and at least a plurality of the electrical heat conductors are connected in parallel with each other and are located between the abutting surfaces at which the weld is to be formed.

Abstract: The invention concerns variable contour rollers for use in calendering or pressing devices, printing presses and like applications. The rollers include an external element of cylindrical form, for example of cast iron, and in their interior a number of transverse elements which can be made to expand radially by heating. More or less substantial radial expansion provokes directly or indirectly a change in the profile of the exterior generally cylindrical working surface. The interior of the roller may be a shaft carrying heating elements and which is fixed or rotates with the external working surface.

Abstract: The invention relates to a cooking vessel comprising a cooking pan and cover, especially a steam pressure cooker, to which a temperature-dependent resistor is attached as a temperature sensor with an attached computing device for the determination of the temperature inside the cooking pot, and for the transmission of electrical signals corresponding to the temperature detected.In order for the cooking vessel to be equipped for an exact measurement of temperature without greatly increasing costs, a measuring point covered by the handle is provided, to which a temperature sensor is attached. One of the handles of the cooking pot or cover carries a plug accommodation with connection contacts, which mechanically accommodates a computing device formed as a plug unit, and connects electrically with the temperature sensor.

Abstract: A heating resistor of a single crystal manufacturing apparatus, which comprises a cylindrical side wall portion surrounding a melting pot, a bottom portion supporting the side wall portion, and a plurality of slits formed in the side wall portion and bottom portion, wherein said bottom portion has a maximum thickness which is not greater than that of said side wall portion, and said bottom portion has a minimum inner diameter which falls within a range of 20 to 80% of an inner diameter of a lowermost portion of said side wall portion.