Abstract: A temperature regulating device is provided for electrical cooking appliances wherein the heat is provided by heating bodies, or elements, for plural heating zones. The device has a heat resistant bar or rod of high thermal expansion. The rod is enclosed within a tubular jacket formed of two tubes set end-to-end along the rod. The rod is spring mounted for moving an electrical contact of a switch to open and close the switch. The tubes have different coefficients of thermal expansion, the coefficient of the tube nearest the switch being the same as that of the rod, for providing a uniform switching characteristic over a wide range of operation of the heating elements.

Abstract: A heating unit combining a block of thermal and electrical insulating material and an electrical resistance element in which the block contains a mass of ceramic fibers bound together and has an elongated slot with confronting walls rising to the surface of the block from opposite sides of a land, and the resistance element is in the form of a thin member constructed of a continuous resistance wire which is provided with opposite bends to form a serpentine shape, the bends being embedded in the opposite walls of the block to secure the electrical resistance element on the block, and the resistance element abutting the land of the slot between the walls thereof.

Abstract: A flexible heating wire includes a first conductive body, a second conductive body, a thermally fusible electrically insulative body which are arranged such that the first and second conductive bodies will be brought into electric contact with each other when the thermally fusible electrically insulative body is thermally fused, a third conductive body, and a heating body having a positive temperature coefficient and held in electric contact with at least one of the first and second conductive bodies and the third conductive body. The flexible heating wire is capable of self-controlling the temperature of the heated heating body. The flexible heating wire can detect the danger of localized overheating, abnormal overheating, or the generation of an arc which is caused when the heating wire is subjected to external oppression, bending, or twisting, or when the heating wire is heated by an external source, or when a conductive material has been mixed in the PTC heating body.

Abstract: A heat tracing tape which can be cut to required lengths has a heating element comprising at least two lengths of woven or braided resistance wire each in the form of a flat strip. The strips are encased in extruded silicone rubber whereby they are spaced from one another. The strips are electrically connected at one end by a connector and the tape is provided with a power supply termination either at its other end, or at a T-branch connection, for connecting the tape to the power control system. The power control system is adjustable to set an estimated value of power required to maintain a predetermined process temperature. The system automatically adjusts the power supplied to the tape to the estimated value by means of a feedback control system. A process temperature sensor also regulates the power supplied to the tape in accordance with a sense temperature.

Abstract: A heat-recoverable article which can be connected to a power supply and a switch unit which comprises a thermally-responsive member which can be thermally coupled to the article. The thermally-responsive member, when so coupled, regulates the passage of current through the article. The article heats and recovers and current through the article is regulated automatically.

Abstract: The main container of a deep fat fryer has electrical tubular heaters outside the frying fat area and integrated in thermally conductive manner into the walls of a flow circulating shaft and which heat the frying fat in the case of upwardly directed flows through flow channels and consequently keep it in continuous flow circuit by means of a rising flow channel. For temperature regulation purposes is provided a fat temperature sensor which directly taps the fat temperature and also a temperature sensor in the form of a running dry protection means, which taps the temperature directly on the tubular heaters or the associated wall.

Abstract: Elongate electrical devices, comprising two conductors with electrical elements connected in parallel between them, have improved performance if the power supply is connected to one conductor at the near end and to the other conductor at the far end. Particularly useful devices are heaters, e.g. PTC conductive polymer heaters. The power supply is connected to the far end of the device through a connection means whose electrical properties can be correlated with those of the device in order to obtain a wide range of useful results. For example the connection means can have PTC, NTC or ZTC character and can be a simple conductor or another elongate device. The power supply can be DC or single-phase, two-phase or three-phase AC.

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: The deep fryer comprises an oil tank, an immersed heater (3) controlled by a thermostat (2) which disconnects the heater when the oil reaches a given temperature. The thermostat comprises an auxiliary switch (a) which controls a signal light (a-1) or some other signalling means operating at a temperature 5.degree. to 10.degree. C. below the operating temperature of the main switch (b) which controls the heater. One thus anticipates the time when the required temperature is reached. By immersing the product to be fried at that moment, one eliminates the inertia effect of the thermostat, prevents the disconnecting of the heater, and reduces the drop in temperature. The duration of the cooking cycle is reduced.

Abstract: A heating sheet is provided in which protective covers are laminated to both surfaces of a heating element in which plastic sheets are respectively formed on the two surfaces of a metal foil heating circuit. The protective covers are adhered to the heater element such that indentations or recesses may be formed in those portions of the protective covers which do not correspond to the heating circuit.

Abstract: Utility model patent for a support for electrical resistances of ovens or kilns with ceramic mantle thermal insulation, used to support resistances of the kind consisting of a filament or ribbon of electrical conductor material laid in a sinuous or fretwork fashion on supports and, in this model, comprised of an isosceles-triangular end 1 which is driven into the mantle 2 and followed by a middle flange 3 which is in turn followed by a cylindrical end 4 on which rests the filament or ribbon constituting the resistance 5, the part being completed with a removable ring 8 which is placed on the free end of the end 4 and holds fast on the said end section 4 the portion of ribbon or filament constituting the resistance 5.

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: A thermoplastic heat-fusion pipe fitting system comprising a thermoplastic heat-fusion pipe fitting having a body portion to accommodate pipe and a shaped portion bearing a code indicative of the amount of heat required to effect fusion of the fitting, means for heating the fitting, means for sensing and decoding the code, and control means responsive to information decoded from the code for regulating the amount of heat applied by the heating means to the fitting.

Abstract: A precision resistor of the type formed by defining a resistive path in a thin foil of resistance material attached to a substrate. Metallic interface layers are deposited on terminal pads between which the resistive path extends, so that when solder-coated copper leads are spot-welded to the terminal pads, the junction between the copper leads and the terminal pads is both a spot-weld and a solder connection.

Abstract: An electrically heat-recoverable assembly comprising a heat-recoverable article and a pair of electrodes. The electrodes supply current to the article without interferring or limiting the way in which the article can be deformed in order to render it heat recoverable. The electrodes are placed and connected to the article in light of the properties of the article, especially its volume resistivity. The assembly significantly reduces the possibilities of arching or sparking while generating sufficient heat that is generated sufficiently uniformly throughout the article.

Abstract: The resistor assembly includes a plurality of resistor sections each in the form of resistive plates in which slots have been cut to provide a continuous resistive element of low inductance. The resistor sections are stacked together with thin insulating sheets separating adjacent resistor sections. The resistor sections are serially interconnected. Taps are provided on selected resistor sections to form a plurality of serially connected resistors in which each resistor is electrically isolated from an adjacent resistor but closely thermally coupled thereto. The resistive plates are bound together by discrete bands of an insulating material such as glass cloth tape. Epoxy impregnation allows the resistor assembly when connected in shunt with series connected superconductive coils to be immersed in the liquid helium of a magnet cryostat without causing excessive pressure rise during a quench event.

Abstract: A method is disclosed for matching the sensitivities of different-sized resistors to changes in resistance due to changes in width resulting from a systematic manufacturing error. In order to produce sets of resistors which can be deployed in predetermined ratios of resistance, the sensitivities of a matching resistor and a reference resistor are equalized by forming the matching resistor as a plurality of parallel strips as opposed to a unitary rectangular section.

Abstract: An electric thermal unit is disclosed for controllably heating cylinders in plastic material extruders, rubber drawing machines, and the like apparata. The electric thermal unit is designed to provide closed circuit ventilation air circulation such as to enable the heated outlet air to be used for other applications, whether related or not to the proper operation of the cited apparata.

Abstract: A glow plug for preheating the combustion chamber of a diesel engine. The glow plug has a ceramic heater rod with an embedded resistor. A metal holder holds the front of the heater rod. A terminal assembly at the rear of the holder provides for two electrically isolated terminals which are connected to the heater rod by flexible, insulated wires. The insulating bush which isolates the terminals is formed by inserting insulating material between a metal pipe and the terminals. This pipe is then subject to external force to create an air-tight seal.

Abstract: An electrical solder pot has a base with a hollow interior. A housing member also having a hollow interior attaches to the top of the base. The housing member further includes an opening at its top. A threaded socket is fitted in the base so as to accept a heating element which is oriented vertically within the hollow interior of the combined base and housing member. The heating element includes a threaded connector positioned near the opening in the top of the housing and accepts a threaded solder container. The solder container attaches to the top of the heating element and is positioned above the opening in the housing. The heating element includes an internal thermal conducting member located within a tube with an appropriate socket connector on the tube so as to connect to the socket in the base. A monolithic burnt ceramic heater is positioned within a cavity in the thermal conducting member.