Abstract: At least one radiant heating resistor (10) formed from a corrugated flat material band has in different orientations projections (28) projecting from a corrugated longitudinal edge (14), which on the one hand for retaining purposes engage in an insulation (3) and on the other hand form longitudinal portions (39) with a slightly lower electrical resistance and which for the conventional operating power appear dark compared with the intermediate, visibly glowing longitudinal portions (38). Thus, on putting into operation, there is a very rapidly starting, punctiform lighting up of the corresponding longitudinal portions (38), which then spreads out to a wavy line, as well as a very reliable anchoring of the heating resistor (10).

Abstract: An inductive hot point heating system is regulated or controlled by an oscillation packet control, which uses a symmetrical pattern of complete mains half-waves. The switching takes place in the zero passage and is symmetrical in such a way that there is no d.c. voltage component in the mains. It also contains an optical temperature monitoring of the plate covering the cooking point with an infrared photosensor, which determines the temperature on the basis of its predetermined spectral range.

Abstract: A flow heater (11) has a stainless steel tube (1Z), around which is externally placed a polyimide (KAPTON) insulating film (14) with an overlap (15). Under pretension is wound onto the same a metallic resistance material heating tape (17), so that the resulting elasticity reserve, also at operating temperature, ensures a good application of the heating tape to the film. Temperature switching devices for preventing excess temperatures or running dry can be fitted in the overlap area (15).

Abstract: An inductive cooker heating system has a high frequency-supplied induction coil. The thickness or wire thickness of the single conductors for a conventional frequency between 20 and 30 kHz (25 kHz), is approximately 0.2 mm. This limited wire thickness has proved to be particularly low-loss. The arrangement of the induction cooking point comprises a thermal insulation placed below a plate for receiving cooking vessels, a shield with branched, grounded line structures and a disk-like induction coil, which is back-connected on the underside by a ferrite yoke plate.

Abstract: A device (1f), which is e.g. provided as an overheating protection means for detecting the temperature on a heating device (4f), apart from a temperature sensor (3f), also has an insulating connecting piece (20f) with all the connecting elements (23f) necessary for the electrical connection of the heating device (4f), in such a way that these connecting elements (23f), following the fastening of the device (1f) to the heating device (4f), are accessible directly adjacent to the outer circumference thereof and to the associated face (31f) of a device base (19f), so as to produce the necessary connections.

Abstract: A heating unit (1) for a cooking point has an outer heater (3) and an inner heater (4) located concentrically for separately heating an associated surface area (13, 14) of the overall heating surface (2). The two heaters (3, 4) can be differently regulated such that supplied power is periodically switched over and distributed in very short, but variable time intervals in a continuously alternating manner to the two heaters (3, 4). Switching over takes place in the passage of the alternating current characteristic through the zero line. Thus, without influencing a clicking rate, there can be a random power distribution on at least two surface areas (13, 14) of the same heating surface (2) and a high efficiency with a relatively simple control (10).

Abstract: Heating resistors and/or series resistors (10) are curved in flat corrugation manner from flat band and are so pressed into the bottom (7) of an insulation (3), that they are only prevented by friction from rising from the bottom (7). The resistor (10) has non-offset, uninterrupted, through-edge faces (14, 15). Thus, in the case of a very simple construction, a surface-specific, high power density can be obtained.

Abstract: For producing a tube connection for a capillary tube, the connecting end is provided with an engaged connecting cap, then on the tube end is produced a funnel-shaped widening adapted to an extension and finally it is frontally fixed with a welded joint to the connecting cap. The thus formed mouthpiece can then be so connected with a connecting unit, e.g. a diaphragm capsule, a temperature sensor, etc., that the connection, completely covered to the outside, is located in the fluid space of the duct system. All the working steps can be carried out completely automatically, e.g. on a transfer line.

Abstract: An electronic regulator (12) for electric heating apparatuses, such as baking ovens (11), is equipped with a microcontroller (20), which contains in fixed programmed form the process data for the individual regulating functions. For adapting the real data of a temperature sensor (19) to the ideal conditions, e.g. in the center of a baking oven muffle (14) is provided a separate, non-volatile, but programmable memory (EEPROM) (26). It can be programmed from a personal computer (34) by means of a read-in connection (32), said computer determining the parameters by comparing the values of the standard temperature sensor (19) and separate temperature sensors (36) located at ideal points. The memory (26) can be differently programmed for individual operating modes.

Abstract: An adjusting shaft for an electric regulating or control device, which operates equipment functions by means of a control cam, is profiled to engage the control cam and can be installed subsequent to the complete assembly of the control device and fixed relative to the control device by a spring detent and associated stop. The stop can also serve to prevent unintentional rotation of the control cam until displacement of the stop against the opposition of a biasing spring. The subsequently installed shaft can allow use of universal control devices with random shaft lengths and types.

Abstract: A base (1) provided with movable and mechanically loaded operational parts has a planar, plate-like base body (3), to which are fixed support bodies (5 to 9) located on an assembly side (4) with plate-like connecting parts (17, 18) exclusively by means of adhesive connections (10), such as melted joints, so as to be closely engaging and correctly operationally positioned. This construction is suitable for numerous switching, control and regulating devices and permits simple manufacture, low weight, high strength, good accessibility and high operational reliability.

Abstract: In the manner of a tubular heater, a temperature sensor comprises a metallic tubular jacket with internal resistance wire coil embedded in insulating material and closing pieces having electrical connection members, so that a very simple, robust and high temperature-resistant temperature sensor with a measuring range up to e.g. approximately 750.degree. C. is obtained. The temperature sensor jacket can be earthed or grounded. For operating the temperature sensor there is appropriately a test current in the mA range in the case of a test voltage in the mV range, whose temperature-dependent changes are processed by means of an electronic amplifier.

Abstract: The device comprises a sensor supplying a sensor signal which varies as a result of the placement of a cooking vessel in a heating zone of a heating appliance. The device includes evaluating circuit which, as a function of the sensor signal, supplies an output signal. The evaluating circuit produces the output signal as a function of the rate of change of the sensor signal to indicate the presence or absence of cookware in the heating zone of the heating appliance.

Abstract: In the case of an electric hotplate (1), the profile ring (17) for supporting on the hob (2) is provided by an elastically resilient circumferential stretching and a resilient cross-sectional zone (29) with an outer ring leg (18) resiliently deflectable within close tolerances and which by a washer-like circular rim (28) forms a flat support surface (26) for support on the hob (2). The consequently cup springlike, movable seat part (25) of profile ring (17), on securing the electric hotplate (1), slides with a sliding edge (27) out of an angular position into a whole-area engagement on seat (8) of hob (2).

Abstract: The rim of an electric radiant heater is formed by a multilayer body (13). It can have the cross-sectional shape of a U, whose interior is filled with a good insulating material. In the interior (23) is placed a sensor coil (23) for a pot detection system, where it is well shielded against heat and mechanical influences.

Abstract: A rod sensor (1) has in the vicinity of a sliding guide (17) of an outer tube (2) a bolt-like, smooth abutment (4) for an inner rod (3), which prior to the insertion of the inner rod (3) and prior to the constructional joining of the temperature sensor (1) to a switch base (10) is adjusted with a measuring screw (36) against the tension of a spring (39) to a predetermined adjusting amount (30) and is firmly connected to the outer tube (2) by a welding mechanism (40) or the like. Thus, a very accurate adjustment is obtained in the case of a simple construction.

Abstract: A radiant heater with partly embedded and otherwise projecting heating coils (16) is produced in that the coils (16) are placed in grooves (14) of a tool or mould (13), the interior of the heating coils is partly filled with a filling material (17) and then the dry, pourable insulating material is pressed thereon. Thus, the filling material forms a counter-die and is removed on taking the compressed insulator (21) out of apparatus (11) in that it drops between the heating coils.

Abstract: An attaching or mounting tool (21) is used for fixing a heating coil (16) to an insulating material support (13). The heating coil (16) is inserted in slots (24) therein and are held in place by magnetic force. Resilient positioning devices (28) are provided in openings (26) in the tool (21) and into the same can be introduced the nose (36) of a clip fitting device (24), so that the heating coils can be fixed to the support (13) by means of clips.

Abstract: In a glass mounting plate, which is provided on the underside with a partly transparent and partly non-transparent mask, is fitted an electric hotplate. An illuminating chamber illuminating by a lamp is connected to its underside. The mask gives rise to a marginal area through which light shines to the outside for indicating the operating state of the hotplate. The mounting plate can also be made from non-transparent material, such as sheet metal. The light then passes through a permeable seal or other transparent mounting components.