Abstract: A flexible electric heating pad has a plurality of positive temperature coefficient (PTC) ceramic thermistor chip heating elements arranged in a two dimensional array between first and second flexible planar sheets of electrically conductive material, preferably woven of copper wire or other electrically conductive fibers. The PTC thermistor chips are disposed in spaced openings in a flexible dielectric separator disposed between the sheets and each chip has opposed planar surfaces soldered, welded or brazed to the sheets to establish electrical and thermal contact therewith. An outer flexible dielectric material covers the external surfaces of the sheets to prevent grounding or shock. A metallic enclosure, for example of stainless steel, can be formed over the outer dielectric material to add corrosion or abrasion resistance to the flexible heating pad.

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: A method of forming an electric heater pad having a continuous resistance heater wire which zig-zags transversely back and forth in longitudinally spaced runs secured intermediate two insulating sheets, the method comprising: (a) laying the wire inbetween the sheets by successive passes back and forth transversely between the sheets, (b) drawing the two sheets with the wire therebetween between two first pressure rollers to bond central areas of the sheets together leaving border strips on each transverse slide edge of the sheets unbonded, and (c) subsequently, bonding the sheets together over the border strips, wherein each successive pass comprises: (1) catching the wire between the sheets in a nip between the first rollers near the juncture of the border strips and central areas at one side, (2) drawing the wire transversely across the sheets to beyond the side edges of the sheets at the other side where tension is applied to the wire forming it into a straight run extending transversely across the sheets

Abstract: The invention is directred to an electric heating in a bread toaster, comprising an insulating body (11) and heat conductor portions (14, 14') which may be arranged on both the front part and the back of the insulating body (11) and are pressed thereagainst by mounting strips (21). To compensate for uneven browning of the article to be toasted--which is caused by the bread toaster being cooled by an air current entering at its bottom and subsequently flowing mainly in the area of the center axis (X) of the insulating body (11)--, it is suggested to provide the mounting strips (21) on the insulating body (11) spaced from one center aixs (X) and thus substantially outside the range of action of the air current.

Abstract: Curable compositions which are useful for encapsulating electrical connections and for joining metals to metals, and which comprise a mixture of high and low molecular weight fluorocarbon elastomers. Preferred compositions comprise a mixture of three fluorocarbon elastomers, the first having a Mooney viscosity at 121.degree. C. of at least 120, the second a Mooney viscosity at 121.degree. C. of 80 to 110, and the third a Brookfield viscosity at 100.degree. C. of 1,000 to 4,000 centipoises, in amounts 5 to 50%, 25 to 70% and 5 to 50% respectively, based on the weight of the polymeric component. The compositions can be easily molded under heat and pressure, and after they have been cured, they have remarkable resistance to degradation by hot liquids, even under pressure. Consequently, the compositions are very useful in the manufacture of self-regulating heaters for use in heating the production tubes of oil wells.

Abstract: A holding element for heating bars in industrial furnaces must be as flexible as possible so that it can accommodate the thermal expansion of the heating bars. Circular rings or circular-ring sectors provided with bores and made from a flexible graphite laminate plate are used for this purpose.

Abstract: In the radiant heater for an electric appliance such as a cooker, the heating element is secured by glue on stakes automatically inserted into and held by friction in a compacted layer of microporous thermal insulation.

Abstract: An electric heating unit for heating fluid, such as air in a hair drier, includes two ring-shaped electrodes and a plurality of spaced, plate-like ceramic heating elements having a positive temperature coefficient of resistance (PTC) aligned between the electrodes. The electrodes comprise an inner ring and an outer ring disposed in a nested, concentric, spaced relationship. The PTC ceramic plates are radially arranged in aligned spaced relationship with the opposite ends of each PTC ceramic plate mechanically and electrically connected respectively to the inner and outer rings. The inner and outer rings can be formed as arc-shaped segments separated by gaps prevent damage to the PTC ceramic plates by heat strain, and are provided with slits, grooves, etc., for firmly positioning the PTC ceramic plates.

Abstract: In the assembly two or more strips of resistance material are positioned edge-to-edge and fan-folded between the side members of a frame. The strips are supported at their loops by insulated fixtures and each has a terminal at each end. The strips are embossed or indented between loops so as to form longitudinally extending offsets spaced from each other across the strip. The depth of those offsets is controlled so that the clear space between the adjoining flights is just sufficient to admit a flat metal strip inserted between them crosswise with a portion projecting to form a tap. That tap can be positioned anywhere between parallel flights of the resistor ribbon after the assembly of the unit. A channel-shaped clip fits over the projecting tap and the edges of the adjoining flights of resistor ribbon and is welded to the tap and the flights.

Abstract: The invention is directed to a method for the manufacture of a heating unit comprising an insulating body having a front and a back side, one or several heating conductors arranged on the front part of the insulating body, and contact and fastening elements. The heating conductors are connected to the insulating body by means of the contact or fastening elements. To manufacture single- and double-faced heating units in a common process, it is proposed that in a first operating sequence the contact or fastening elements are rigidly fixed together with the insulating body by means of anchoring arrangements and that in a second sequence the one or several heating conductors are contacted with the contact or fastening elements.

Abstract: A heating unit, in particular for bread toasters, with a useful heat emitting area (2) and a waste heat emitting area (12), comprising an insulating body (1) and a heat conductor wound thereon. In bread toasters the efficiency of such heating units is considered unsatisfactory, and undue heating of the housing occurs since the radiation of heat in the waste heat emitting area is not directed to the material being toasted but to the housing walls. To avoid this shortcoming, it is proposed to short-circuit the heat conductor portions (12) extending in the waste heat emitting area.

Abstract: A resistance heater element for an electric room heater includes a resistive heating conductor (1) supported by an insulating support (2) mounted on the support flange (9) of an electric fan (4) in the heater which passes a stream of room air across the conductor (1). The insulating support (2) is cylindrical, with its axis parallel to the direction of the air stream, and includes at least one pair of nested mica bands (5, 5') bound together by fillets (6) connected to the support flange (9). The heating conductor (1) comprises at least one wire of resistive material bent in a zig-zag manner to form a plurality of radial loops each having portions extending inwardly and outwardly of the cylindrical bands (5, 5'). The central portion (11) of each loop is bent over and retained between the pair mica bands (5, 5') with the inner portion of each loop emerging radially from the inner band (5) through apertures (13) provided therein.

Abstract: An electric radiant heater (11) for heating a glass ceramic cooking surface (12) contains a dish-shaped insulator (14), to whose inner bottom surface (18) are fixed heater coils (20). The heater coils have an oval cross-section and are pressed by their narrow sides into surface (18) and fixed. The fixing pressing in takes place during the moulding of the moist insulator (14), made from fibrous material and by means of a male mould receiving the heater coils in slots.

Abstract: A flexible circuit which may be a strap or a board or the like has a plurality of conductors exposed on one surface in a predetermined array and a heater disposed on the opposed surface so as to heat the exposed conductors. The exposed conductors may have solder or the heat activated conductive bonding material applied thereto so that the flexible circuit may be directly connected to a component, a printed circuit board, a connector or the like. If a reusable bonding material, such as solder, is employed the heater may be utilized to both connect and disconnect the flexible circuit.

Abstract: This invention relates to an improved method of making an improved injection molding nozzle having an integral electrical heating element which is grounded adjacent the corrosion and wear resistant pointed tip. A main body is made of steel with a cylindrical central portion and a tapered portion adjacent a forward recessed end. The heating element is inserted through a heating element bore drilled diagonally through the tapered portion and wound in a spiral channel machined in the surface of the central portion. A high speed steel tapered tip portion is mounted on the forward end of the main body with the exposed forward end of the heating element extending into a central heating element bore therethrough. The surfaces of the assembly are sprayed with sticky acrylic lacquer and it is then dipped in a nickel powder bath. Beads of nickel brazing paste are applied to the joints. A high speed steel insert portion is dropped into the mouth of the bore, followed by a quantity of nickel brazing powder.

Abstract: A heating cable has a median strip of transverse slits. extending longitudinally through the median strip in an .OMEGA. or U-shaped bend for receiving an electrical cable. The ribbon is made of metal, preferably a good heat conductor. The slits open when the ribbon is bent, as when it goes around a corner during installation.

Abstract: This invention relates to an improved injection molding nozzle and method of making it. The components are assembled and dipped in lacquer and powdered nickel prior to brazing in a vacuum furnace. This integrally brazes the components together, embeds an electrical heating element in a spiral channel, and provides the surfaces with a protective nickel coating. In one embodiment, the forward end has an integral high speed steel insert and the remote end of the heating element extends into the forward end of the nozzle. In addition to providing the protective coating, carrying out the method with a single vacuum brazing step considerably reduces manufacturing costs.

Abstract: In an IC-loaded thermal head, a flip chip is used as IC, and respective terminals of IC elements are directly connected by wireless bonding to terminals of heat generators of the head and terminals for external connection.

Abstract: A bobbin assembly for a soldering/desoldering device may be readily produced by utilization of a heater assembly comprising an electrically insulating tape having an etched foil heater in the form of serpentine comprising a plurality of coextensive side by side parallel leg portions bonded to one side thereof. The bobbin assembly is formed by wrapping the heater assembly about a cylindrical bobbin with the heater leg portions parallel to the bobbin axis so as to form a first insulating layer in contact with the bobbin, a layer comprising the heater in contact with the first layer and a second insulating layer in contact with the heater. A wire is then wound about the entire assembly, in a helical manner, to hold all elements in place. Additionally, a dissimilar metal lead may be spot welded to the bobbin to form a thermocouple junction used for sensing the bobbin assembly temperature.

Abstract: In a mounting device for electrically heated, spirally wound wire cathodes in electron guns, two mounting posts joined together by an insulator are configured as sector-shaped sections of a hollow cylinder, and have each a circumferential groove on its end remote from the insulator. The surfaces defining the grooves are parts of common circular and cylindrical surfaces, and the mounting ends of the cathodes are of a configuration approximately complementary to that of the grooves in the mounting posts. The mounting ends therefore lie in a spring-biased and form-fitting manner in the circumferential grooves.

Abstract: An evaporator coil heat exchanger assembly of a refrigeration system, such as a transport refrigeration system, which includes an electrical heating element for rapid defrosting of the evaporator coil with its attendant refrigerant carrying tubes and cooling fins. The electrical heating element is quickly attached to the collective edges of the cooling fins by a plurality of low cost spring retainer clips which have one portion which extends between two closely spaced cooling fins to hook a refrigerant carrying tube, and another portion which holds the heating element against edges of the cooling fins with a spring force. The spring retainer clips may be just as quickly removed should the heating element require replacement. Only three curved sections are required to be formed in a single length of wire to form the active elements of the spring retainer clip, and a handle portion is formed in the remaining portion of the single wire length.

Abstract: An infrared ray heater unit, made of a ceramic plate carrying a resistive heater wire embedded therein, is mounted on the open end of a shallow box-like metallic case so as to emanate infrared rays, while a terminal insulator member having lead wire bosses and a securing means is inserted between the heater unit and the metallic case at the central portion of the heater unit. The metallic case has mounting holes through which the lead wire bossed and the securing means of the terminal insulator member extend, so that lead wires are connected to the infrared ray heater from the back of the metallic case at about its central portion.

Abstract: The boiler comprises a vessel (1) and a heating element (2) associated with this vessel (1). The vessel (1) comprises at least two compartments which have mutually facing wall members (3, 4) having a profile complementary to the heating element (2) and deformably connected together by a wall part (5). The heating element (2) is disposed between the wall members (3, 4) and a retainer holds the wall members (3, 4) against the heating element (2). A bridge is formed by a wall part (5) which deformably connects the wall members. The retainer includes a top part (9) of the vessel and a split ring (10).

Abstract: An electric resistor element which can be installed on the outer surface of a filter such as the oil or fuel filter of a combustion engine. The electric resistor element is designed especially for improving the cold starting of a combustion engine. It is suited to be employed particularly during the cold seasons, and apart from improving the cold starting, it is also designed for heating the fuel such as diesel oil before feeding it into the engine. In connection to the oil filter, onto its outer surface there is arranged the electric resistor element in such a fashion that the caloric capacity produced therein is conducted as as effectively possible into the oil filter proper and therealong further into the oil contained in the filter. The electric resistor element is formed as a wide and thin tape and attached around the oil filter, preferably in the vicinity of the filter ring between the oil filter and the engine or the like.

Abstract: The heater of the present invention includes a paper or plastic substrate on which is printed a semi-conductor pattern (typically a colloidal graphite ink) having (a) a pair of longitudinal stripes extending parallel to and spaced apart from each other and (b) a plurality of identical bars spaced apart from each other and extending between and electrically connected to the stripes. A metallic conductor (typically copper stripping) overlies each of the longitudinal stripes in face-to-face engagement therewith, and the conductors are held in tight engagement with the stripes by a sealing layer that overlies the metallic conductors and is sealed, at opposite sides of the semi-conductor stripe associated with the particular metallic conductor, to portions of the substrate that are free from the printed semi-conductor pattern.

Abstract: A heater coil mounting is provided by means of a bracket having seats formed at or adjacent each axial end and into which an insulator through which the heater element passes, is adapted to be received. The bracket is mounted in position on a wall using tabs which cooperate with portions of the bracket to hold the bracket close to the wall and form a further portion of the seat to lock the insulator in position.

Abstract: A grid assembly for converting electrical energy to heat and then dissipating same. A plurality of parallel grid members include outwardly extending legs received in holes provided on mutually facing surfaces on polyester glass insulator members. The grid members are arranged in a continuous serpentine path from an input to an output terminal. The grid members are of sheet metal construction with the cylindrical legs formed by a radiused sheet metal configured leg portion of one grid member positioned adjacent an identical configured and mutually opposed leg portion of an adjacent grid member. The main body of each grid member extends from the legs through a flat portion and then through a diverging end portion spacing the main bodies of the grid members apart. In an alternate embodiment, the grid members are arranged with different lengths to provide a particular sized and configured grid assembly.

Abstract: A connector fitting in the form of a sleeve for use on synthetic resin pipes has heating wire let into its inner face for heating the sleeve material and the ends of the pipes to be joined so that a fusion weld is produced. In order to have the wire so fixed in place that on the one hand there is no danger is its being pushed out of place when the pipes are slipped into the fitting, while on the other hand taking care of inaccuracies in the size of the pipes, the wire is let into a cut or groove, that has been opened up, in the fitting and the edges of the cut are overlapped onto the wire so that it is well locked in place.

Abstract: A heating kettle includes a pot having a bottom wall and a side wall, a heating element adapted to heat the pot, and a hold-down plate for holding the heating element against the bottom wall of the pot. The hold-down plate is secured to both the bottom wall of the pot and to the side wall of the pot by a plurality of fasteners. Such plurality of fasteners securely sandwiches the heating element between the hold down plate and the bottom wall of the pot, thereby minimizing the deformation of the bottom wall of the pot and of the heating element during use of the kettle so as to increase the efficiency of the kettle.

Abstract: An electric hair curler comprises a handle and a barrel connected thereto for winding thereabout the hair. The barrel is provided with an electric heater for curling the hair wound on the barrel. The heater includes a plurality of resistor elements in the form of strips extending along the length of the barrel in generally parallel relationship with one another and being electrically connected in series by a corresponding number of bridging segments. The heater thus constructed is mounted on the barrel with the resistor elements thereof being exposed on the outer surface of the barrel in circumferentially spaced relationship with one another around the barrel, so that each of the resistor elements is in direct heat transfer contact with the hair to be wound on the barrel, thus greatly reducing the heat loss to assure effective heat transfer from the heater to the hair.

Abstract: An insulator for a coil-type electric resistance heater is disclosed in which the insulator has inclined side faces forming the outer end of the insulator angling inwardly toward one another with side notches in the insulator at the base of the inclined side faces and a central notch in the outer end of the insulator between the two inclined side faces. The distance between the center notch and the outer ends of the inclined side faces is less than the spacing of the adjacent convolutions of the heater element coils so that upon aligning one convolution with the central notch and upon moving the insulator inwardly toward the axis of the coil, the one convolution will be received in the center notch and the adjacent convolutions will be wedgingly engaged by the side faces of the insulator so as to resiliently spread the convolutions such that the adjacent convolutions will snap into the side notches.A method of installing an electrical resistance heater on a plurality of insulators is disclosed.

Abstract: Plastic web to be fed into opposite dies for forming articles must be heated and softened by heater means in front of the forming machine, even if said machine is combined with an extruder supplying said plastic web. The invention provides a radiant heater adapted to be sensitively responsive to manual or automatic control so as to more suitably regulate a temperature of the plastic web in comparison with the conventional heater comprising quartz tubes each having a coiled nichrome wire. The heater of the invention comprises an extended thin nichrome plate arranged in zig-zag on a table plate.

Abstract: A fully removable heating element assembly for use in fluid heaters and boilers, such as the boiler contained in a CO.sub.2 removal air purification system employing a monoethanolamine (MEA) solution, includes a rectangularly shaped housing open on a rear end thereof. An oversize cover plate connected to and covering an open front end of the housing is connectable to an opening in a fluid boiler. A series of elongated hollow tubes, each of which tubes is closed on its forward end and open on its rear end, are connected on rear end portions thereof to the plate so as to project forwardly of the housing into the interior of the boiler. A like series of electrical heating elements are slidably and removably inserted into the tubes and have rear end portions containing pairs of electrical terminals which project rearwardly of the plate and are confined within the housing.

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: 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 steering wheel having cross spokes and mounted for rotation on a steering column is provided with an electric heating arrangement including a thin strip of metal foil adhesively bonded to and extending substantially about the entire outer periphery of the wheel. The outer surface of the foil strip is coated with an electrically insulating plastic film and a protective cover is disposed over the foil strip and steering wheel outer periphery and secured by lacing. A control switch mounted on one of the spokes is connected to the foil strip by power supply leads extending along the spoke. A current limiting resistance element is interposed intermediate the length of the metal foil strip to insure moderate current levels therethrough and is carried by another spoke of the wheel.

Abstract: An insulator for an electric heater employs a central elongated slot and two guide surfaces. Below each guide surface is a notch for receiving an outer convolution of a heater coil, while the central slot terminates in a notch for receiving an intermediate convolution of the heater coil. The slot engages the central convolution of the heater coil before outer convolutions engage the guide surfaces to facilitate installation of the insulator. As the insulator is inserted into the heater coil, the guide surfaces engage the outer convolutions and direct them to respective notches for securely holding the heater coil. The insulator may support a single pass of the heater coil or may be arranged to have these surfaces and notches on opposite ends to support two passes of the heater coil.

Abstract: An electrical resistance heating assembly having specially designed electrical insulators is disclosed. The electrical insulators have arms shaped to retain an electrical resistance heating coil which can be quickly, easily, and reliably mounted on the arms of the insulator. Top parts of the arms are generally rectangular or triangular in cross section and the arms are spaced and configured relative to each other to form a generally T-shaped opening between the arms, with the ends of the cross bar of the T-shaped opening forming electrically resistance heating coil retention surfaces. Also, cuts in side surfaces of the insulators may provide additional coil retention surfaces.

Abstract: An evaporative cooling unit for a refrigeration system includes a plurality of spaced, parallel metal heat exchanging fins provided with a plurality of openings receiving successive turns of a coiled tube adapted to carry refrigerant through the unit. The fins are further provided with snap-action cutouts extending from the periphery of the fins inwardly to a location between adjacent rows of the coil turns and a rod-like electric resistance heating element for periodicaly defrosting the unit is held in the cutouts. Each cutout includes an entry slot inwardly tapered to a throat defined by deformable edges spaced apart a distance marginally less than the diameter of the heating element to present resistance to the passage of the heating element through the throat and a notch communicating with the throat and within which the heating element is held.

Abstract: A contact heater mounting assembly includes a single rolled flexible sheet which both supports a plurality of heating elements and provides protection for a high cohesion level adhesive on the elements. The assembly thus provides for convenient installation of the elements to a vehicular window glass or other surface to be heated without the need for removal of a separate cover member otherwise utilized for protection of the high level adhesive. In a preferred embodiment, the contact heater mounting assembly is elongate and capable of being rolled into a coiled form. The flexible sheet defines opposed top and bottom surfaces, the top surface carrying a low cohesion level adhesive for supporting a plurality of heating elements, each of which carries a high level adhesive thereon.

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 heater is disclosed having an elongate wire heating element with the heating element including at least two generally parallel runs supported on a frame by insulators with the portion of the heating element consituting the runs being formed generally in a helical coil and with the portion of the heating element between the runs being referred to as a turnaround. Specifically, the turnarounds are of non-helical coil construction and have at least one loop therein between the insulators supporting adjacent runs of the heating element thereby to permit limited movement between the adjacent runs and to permit thermal expansion and contraction of the turnarounds without applying a substantial force to the insulators.

Abstract: An elongated flexible resistance heating element includes a heat transmitting cover that is generally coextensive with the element. A resilient element is provided adjacent one end of the heating element to accommodate extension of the cover for use of the heater as desired without changing the length of the element or cover. The extensible tape heater of the present invention comprises an elongated flexible resistance wire heating element, a heat transmitting extendable cover arranged coextensive with the heating element, a substantially nonresistive wire connected about one end of the heating element, a spring surrounding the nonresistive wire and abutting the cover at one of its ends, a stop positioned about the non-resistive wire in spaced relation to the end of the cover, and a flexible sleeve extending over the spring.

Abstract: An electric heater incorporating simple support structure therefor. A frame is insulated from an electric resistance heater coil by insulated supports mounted within beam members of the frame. The supports incorporate structural features enabling the use of simplified supporting beams. The support insulators include additional structural features for retaining the resistance wire in place and for simplified engagement therewith. The insulators may project on both sides of the support beams and retain heater wires in two planes. The support insulators further provide an integrated structure easily fabricated and simply assembled to the frame.

Abstract: A hair dryer having a quartz glass tube heater to produce radiant heat has a shock mount sub-assembly to resist breakage of the tube when the hairdryer is subjected to drop tests or other selected concussions. The shock mounts include spring members which are flexible and resilient relative to the housing and furthermore have resilient engagement with the tube to allow slight but controlled movement of the tube without breakage regardless of the direction of impact or orientation of the hairdryer when dropped. An internal blower for creating an air flow through this quartz tube heater hairdryer may be included as a safety feature to prevent overheating and to provide nominal air flow for conventional type drying.

Abstract: This invention relates to electric heaters of the type consisting of a flat convoluted loop or coil adapted to be arranged in an opening in a cooktop and, more particularly, to a support system wherein means are provided for cushioning vibrations resulting from relative movement between the convoluted heater and the support system.

Abstract: The insulative stand-off is mounted on a frame and supports a heating coil. In the preferred embodiment the coil loops engage retention surfaces inside the inverted T-shaped opening in the end of the stand-off. The sides of the stand-off forming the opening have cam surfaces which squeeze adjacent central loops together during mounting while the loops adjacent the central loops are deflected to the outside of the stand-off. When the central loops reach the crossbar of the T they spring apart to fix the coil. Other embodiments are shown--all have retention surfaces generally parallel to the coil loops and transverse the coil axis. Cam surfaces control access to the retention surfaces to deflect the loops as they are moved to the retention surfaces and the coil resiliency biases the loops into engagement with the retention surfaces when mounting is completed.

Abstract: The invention relates to support legs for bake elements used in microwave ovens. The improved support leg utilizes a conventional wire leg used on bake elements for electric ranges, wherein the leg is formed of wire which is bent to V-shape to provide a bight and legs extending from the bight. Feet are turned outwardly and angularly of the ends of the wire legs, the feet being coined to provide projection welding ridges. A molded ceramic block is slotted to fit into and around the vee and legs of the wire leg, and the two parts are held assembled by welding the feet to the metal sheath of a conventional bake element. The ceramic block is adapted to engage the floor of the microwave oven and is held by the wire leg with sufficient play so that the block may align itself with the oven floor in the event the latter is not level.

Abstract: An elongate flexible package (10) adapted to contain and either enhance or contribute to the control of the heating efficiency of an elongate heating element contained therein and having sufficient flexibility to conform to the item to be heated to which it is secured. Package 10 is provided with a first layer (1) made from a flexible heat conductive or heat insulative material and a second layer (2) made from a heat insulative material that is secured along the length of package 10 to the side of first layer (1) that faces away from the item to be heated to which package (10) is secured. A third protective layer (3) is disposed over second layer (2) and a cavity (4) enclosed by a portion to the walls of layers (1), (2) and (3) extends along the length of package (10) having a cross-sectional configuration adapted to contain and permit the heating element to be axially inserted into or removed from package (10) without having to remove package (10 ) from the item to which it is secured.

Abstract: An encapsulated PTC heater for a cold-start carburetor comprises a ceramic PTC wafer having ohmic terminal means on its opposite faces, and a thickened annular rim portion adapted to withstand appreciable clamping forces. The rim has portions of said ohmic terminal means. An annular metal holder assemblage has opposite ring portions overlying said thickened rim portion, and has ring-like contacts engaged with the rim portion to bring current thereto. One of the ring-like contacts is nested in an insulating annulus to isolate it from the remainder of the metal holder assemblage, and has a terminal lug extending through an insulating bushing to the exterior. The other ring-like contact is resilient in nature, and is clamped against the rim portion of the wafer by lugs of an annular metal housing constituting part of the holder assemblage.