Abstract: An apparatus for heating gases, particularly air, with a heating unit having a mounting part, at least one PTC component, at least one insulating frame part surrounding the latter, at least one contact plate and at least one insulating support. The PTC component is surrounded by the frame part being inserted in the mounting part and on at least one flat side rests a contact plate and is covered by an insulating support. Heat emission lamellas are mounted in a clamping manner on the heating unit to ensure an effective heat emission to the surrounding air or gas.

Abstract: An electric heater with insulating carrying parts and heating conductors carried by the carrying parts and with at least one tap for tapping a voltage reduced compared with the voltage at the heating conductor. The carrying parts have slots through which pass feet of a tap and through which the tap is fixed to with a carrying part, the length of the slots being greater than a width of the feet of the tap.

Abstract: For the better handling of PTC components during the assembly of a corresponding heating arrangement, in the case of a holding part for PTC components with an insulating frame and at least one contact plate, a contact plate is firmly connected to the insulating frame (12).

Abstract: An electric heating element is proposed, which has a contact unit formed from at least one PTC component and contact plates resting on either side thereof and a casing, whereby for ensuring a good contact pressure in the end product in the unpressed state of the heating element the contact plates (12, 13) are curved and rest with their convex side on the PTC components (14), the casing (2) is made from dimensionally stable light metal and in the unpressed state has an inner wall (17, 18) with a finite radius of curvature (r1) facing in convex manner the contact arrangement (12, 13, 14) and which is larger than the radius of curvature (r2) of contact plates (12, 13).

Abstract: An electrical heating element with a heat conductor in the form of meander-shaped windings, in which the individual windings are held in openings separated by solid parts in at least one insulating plate. For stabilization, especially with long, narrow designs of such a heating element, a retaining rail is provided, which extends over the entire width of insulaitng plates and essentially over their length and has tabs bent over along the side edges of insulating plates to grip the plates on both sides.

Abstract: A sensor (1) for detecting frost deposits, particularly on evaporators of refrigeration plants or the like is proposed, in which between the spaced heat source (3) and heat sensor (4) is provided a thermal connection (2) made from a material, whose thermal conductivity coefficient is of the same order of magnitude as that of frost.

Abstract: Thermal protective switches (1) that are used for limiting the temperature of electrical appliances by automatic opening of the circuit should only reset themselves again after a large change in temperature. In this respect, when the load (9) is overheated, the contact (5') fixed to the bimetallic strip (5) is moved clear of the counter-contact (4) into its open position so that the current through the contact assembly is interrupted. If the fault is not put right there is continuous switching or hunting and there is a danger of the contacts of the thermal protective switch becoming welded to each other. For this reason, for stopping the contacts closing again, the design is such that in the open position the contact assembly, is shunted by the PTC resistor (6). The parts are kept in the open position until the load (9) is turned off by hand.

Abstract: In a glue gun for conducting adhesive bonding by means of a heated adhesive, with a housing having a heating section and an angled handle, a hollow, thermally conductive block being arranged in the heating section for the accommodation of adhesive, the provision is made, to afford the possibility of using the glue gun independently of an external fuel supply, that a hollow combustion chamber provided with air inlet openings is fashioned integrally with the metal block; that a fuel tank is arranged in the handle; and that a connecting conduit is extended from the tank to the combustion chamber, a shutoff element being arranged in this connecting conduit, the combustion chamber in particular being disposed at least partially annularly around the block.

Abstract: An electric heater, especially for small electric appliances, such as hair roller heaters, egg boilers, or the like, and a method of making same utilizes at least one heating element having contact-making zones on opposite planar parallel surfaces thereof, electrical connection elements in the form of essentially planar contact plates, a contact plate being placed on each of the opposite surfaces, and a holding member having a heat conducting, electrical insulating layer upon a surface thereof. The holding member is bent into a U-shape so as to hold the contact plates clamped fast to the heating elements between legs of the U-shape of the holding member and with the insulating layer disposed on an inner surface of the U-shape between the plates and holding member. In accordance with a preferred embodiment, the insulating layer is of a resilient material having a heat-conductive additive distributed therethrough and the heating elements are formed of PTC material.

Abstract: A continuous flow or flash electric water heater, for example for use in a coffee making machine, includes a compound heating structure made up of at least two elongated generally parallelepyred shaped massive heating bodies of a material having a high thermal conductivity, such as brass. Each body has at least one heat input face and a longitudinal passage for flow of water to be continuously heated. The bodies are positioned side-by-side with the passages parallel to each other and with a heat input face of each body facing a heat input face of the next adjacent body. At least one flat PTC electric heating element is positioned between each four of facing heat input faces and a casing made up of two elongated channel-like casing halves, each U-shaped in cross section and having two side flanges, houses the heating structure and forces the bodies together with the heating elements therebetween.

Abstract: In a method for the production of toaster heating elements firstly connecting strips made of electrically conductive material are arranged in the region of edge recesses at opposite edges at the rear side of a support plate, opposite to the heating side. Then a plurality of heating conductor wires are provided substantially parallel to one another and in such a way that they cross the connecting strips in the region of the edge recesses at the heating side and thereby are electrically connected to said strips. Furtheron the wires are cut off. In an apparatus for performing the method there is provided a processing station comprising a supporting surface for the support plate of the heating elements. The processing station further comprises housing grooves one for each connecting strips. Said grooves are situated at opposite side edge regions of the supporting surface. Further a delivery station associated with the processing station is provided.

Abstract: A form of electrical heating device, which is particularly applicable to hair driers but may also be useful in fan heaters or other electrical heaters for gaseous or other fluid media, comprises an insulating support plate around which a resistance heating wire is helically coiled with neighbouring turns of the coil offset to achieve improved heat exchange to the medium flowing over it and while allowing the device to be produced inexpensively and in a simple and trouble-free manner. The centers of the respective groups of turns which are similarly offset may lie on parallel lines or lines which converge along the length of the device. There may be two such groups or more, four for example. The turns are located in suitably dimensioned slots in the edges of the support plate; the wire may be bent into meander or sinuous form, in which case it can be made to grip the support plate in the region of the slots.

Abstract: An electric heating device for heating the interior of a cabinet containing electrical apparatus, such as a switch or distribution apparatus, to prevent sweating or condensation therein, includes at least one PTC electrical resistance heating and temperature self-regulating heating element situated in the interior of an elongated body made of thermally conductive material that is thermally connected to a radiator. The radiator is formed by a pair of flat base plates extending laterally from opposite sides of the body and radiator fins extending only from the base plates and only from one flat side thereof. The body is a massive hollow element having a wall thickness greater than that of the base plates and fins and a height greater than the thickness of the base plates. The body, base plates and fins are formed as a one piece extrusion. A permanent magnet may be used to secure the body to the interior surface of a steel cabinet.

Abstract: An electrical heating element for fluid media, more particularly for hot air appliances, comprising a support member of insulating material and at least two heating conductors which are made of resistance wire and which surround the support member, the heating conductors being wound as helical coils and supported on supporting edges of the support member, the coils being wound with radial spacing from one another. The heating conductors may comprise an outer coil consisting of a resistance wire of high specific power consumption and an inner coil consisting of a resistance wire of low specific power consumption. The support member may comprise a tubular body with ribs projecting radially at the periphery, said ribs forming the supporting edges. The outer ribs may be U-shaped extending from end to end of the tubular body and forming passages through which the turns of the inner coil pass. The ribs preferably comprise mica strips; various mounting means for such strips are described.

Abstract: An electrical resistance water heating device, particularly intended for use in coffee or other beverage preparation machines, includes a solid metal heating plate having planar upper and lower surfaces. A fluid throughflow duct is formed between the upper and lower surfaces and includes at least two elongated, spaced, side-by-side branches having corresponding ends interconnected by a connecting conduit to form a continuous fluid flow path from a water inlet to a water outlet. An elongated slot is formed between each pair of side-by-side branches and at least one plate-shaped planar PTC heating element is accomodated within each elongated slot with each of the opposing surfaces thereof directed toward a respective one of the pair of side-by-side branches between which the duct is formed. The spaces between the heating element and walls of the slot are filled with a hardenable electrically insulative filling of good heat conductivity.

Abstract: In an electrical resistance heating element (1) comprising a heating conductor support (3) of insulating material and a heating conductor (4) of resistance wire wound in meander or sinuously coiled manner with loop ends or bights (6) and loop legs or runs (8), the loops of the heating conductor (4) being arranged substantially in a single plane, and the inner loop ends (6) which are directed towards the heating conductor support (3) being situated in the edge region of the heating conductor support (3), it is proposed according to the invention to construct the heating conductor support (3) as a flat plate, the flat plate to be situated substantially in the same plane as the loops of the heating conductor (4). It is also proposed that the outer loop ends or bights (5) remote from the heating conductor support (3) are to be self-supporting and not secured.

Abstract: A combined water heating and vessel support plate for supporting the vessel of a beverage preparation device includes a heating slab having a water flow-through duct constituted by longitudinal apertures in a plurality of prismatic (preferably rectangular) heating-plate segments which are clamped together side-by-side with PTC ceramic electrical resistance heating elements interposed between them. The duct is completed by connecting the apertures externally by tubes or by duct-incorporating end caps on the heating plate to form a continuous flow path from an inlet to an outlet. Various clamping arrangements, preferably with some resilience, are described, as are the use of inter-segment filling materials and electrically insulating materials with good heat-conducting properties, also the selection and positioning of the heating elements to achieve a desired heating effect. The top surfaces of the segments are coplanar and form a flat vessel support surface for heating a vessel placed thereon.

Abstract: Electrical resistance heating element comprising at least one heating conductor in the form of an element which is provided at opposite surfaces with an electrical contacting means and is made of a material having a positive temperature coefficient of electrical resistance (PTC element), and further comprising two substantially plane contact plates, the contact plates being held together with the PTC element interposed between them to form a single unit acting as a contact arrangement, and a sleeve of electrically insulating, heat conductive material having an inner space whose internal cross-section is adapted to the cross-section of the contact arrangement, the contact arrangement being inserted into the inner space in the sleeve under a pressure perpendicular to the plane of the contact plates. The sleeve consists of elastomeric material.

Abstract: An electrical resistance heating element comprises at least one heating conductor of positive-temperature-coefficient material having contact means on opposite surfaces; if more than one, they may be arranged in a row or in a stack. Electrical connection is made to the heating conductor or the row or stack through two substantially plane contact plates adapted to the layout of the heating conductor, row or stack and placed loosely upon opposite contact surfaces thereof. The components are held together elastically by securing means holding the edges of the contact plates. Two alternative forms of securing means are described, one consisting of a series of U-shaped clips of elastic material distributed along the edges of the element, the other consisting of strips of U-shaped cross-section which are made of material with soft elastic properties and extend along respective opposite edges of the heating element.

Abstract: A heating element for a hair dryer, fan heater or other hot air appliance has heating-conductor support means comprising a length of tube in the interior of which an electronic control arrangement is placed. Where the said arrangement comprises a plate or circuit board this is arranged parallel to the longitudinal axis of the tube. A temperature sensor of the control arrangement is connected directly to the circuit board and projects out of the interior of the tube into the outflowing air flow, preferably from a prolongation of the circuit board which extends beyond the end of the tube. The heating conductor consist of two conductors designed for low power and high power consumption respectively.