Abstract: An electric switching device (1) in the form of a timed power control device with an appliance switch (6) operated by a heated thermobimetal (15) and in the form of a snap switch has an adjusting device (39) for modifying the distance between the opposite contact (36) and the counter-stop (37) for the movable switching contact (34), operated simultaneously with the setting of the different setting ranges of the switching device in such a way that in the low setting ranges the switching hysteresis of the appliance switch (6) is made smaller and in the higher setting ranges larger. Thus, in particular the smaller values of the relative switch on duration of the appliance switch (6) can be set much more accurately, so that there is a very precise power control in the low setting ranges.

Abstract: A continuous flow electric heater for heating liquid contained in a liquid container has a plurality of parallel tubular heating ducts (7b) each bounded by a tubular wall (ib) having upper and lower ends connected respectively to a lower inflow chamber (19b) and an upper outflow chamber (31). The inflow chamber (19b) forms a collector for solids which many separate from the liquid being heated and is defined by a pot-shaped body having a large area solids removal opening closed by a removable cover (25b) and providing access to the interior of the inflow chamber (19b) over the entire width thereof, thereby allowing full access to the interior of the ducts (7b). A tubular heating resistor (17b) is helically wound around each tubular wall portion (8b) to heat the liquid flowing therethrough. A common reception tube (27b) tangentially engaging each tubular wall (8b) between two adjacent turns of the heating resistor thereon removably receives the temperature sensor of a thermal cutout protector.

Abstract: The present invention relates to an apparatus for connecting appliance lines to cooking plates, hobs or hotplates. Our of the bottom of the electric hotplate, connecting pins (19b) extend for connection to connecting members (33) of a connecting piece (31) that is part of the appliance line. From a passage through an insulating member (20b) in the bottom of the hotplate, the connecting pins (19b) project outwards towards the circumference of the hotplate body (2b). In a transportation mode the pins can be resiliently and completely countersunk in the underside of the hotplate. In the vicinity of the front end of the connecting members (33) of the appliance plug, the connecting piece (31) of the plug has a threading and guidance apparatus for the connecting pins (19b) that does not project beyond the outer circumference of hotplate body (2b), thereby ensuring an automatic, positonally correct connection between the connecting piece (31) and connecting pins (19b).

Abstract: Below a hob (2) with at least one cooking point (3), a cooker has a baking oven muffle (7), which can be upwardly vented by a venting duct (10) through the hob (2), at least at one cooking point (3). Cooking point (3) is formed by a sealed electric hotplate (4) having a hotplate body (11) with a closed cooking point heating surface (13) and carries below the surface the electric heating elements (20) in a completely sealed form. In the center (14), which is free from heating elements, hotplate body (11) has a through opening (27) which traverses the heating surface (13) and which forms the upper end of venting duct (10). Electric hotplate (4) can be raised upwards from hob (2), which also breaks the connection between hotplate body (11) and baking oven muffle (7) formed by the venting duct (10).

Abstract: In a radiant heater unit (1) for heating through a hotplate (2), the periphery of the heating field is formed by an initial cooking marginal heating system (9), which is e.g. operated by a short-circuit connection (19), so that it passes much more rapidly from the cold state into the visible glowing state and also in the marginal region use is made of the faster heat transfer there to the bottom (3) of the cooking utensil. The increased radiant power density can also be obtained by other measures, namely by modified insulating conditions in the vicinity of the marginal heating system, by using a PTC resistor in the vicinity of the inner partial power system and similar measures.

Abstract: A hotplate (11) has a flat, plate-like bushing (22) for connecting leads (19). The bushing (22) is directly fitted in a cover plate (20) of the hotplate (11) by means of retaining clips (34). The connecting leads (19) are threaded through the bushing, which bushing is retained in the cover plate (20). The cover plate (20), with bushing affixed is then fixed to the hotplate body. The bushing (22) is not supported on the hotplate underside (40), but is wholly supported in the cover plate (20), facilitating assembly by automated equipment.

Abstract: A radiant heater for cooking appliances with a glass ceramic plate has both bright light-radiating heating elements such as high temperature halogen lamps emitting substantial radiation in the visible range, and also darker glowing radiating elements operable at lower temperatures and radiating emitted light primarily in the infrared region. The bright visible light radiating element and the darker infrared glowing elements are connected in series with one another, whereby the series resistance of the dark or infrared radiator limits initial current loading, and after the radiant elements reach operating temperatures, the infrared element assumes a reduced portion of the total resistance. The visible light and glowing infrared series-connected elements can be interleaved or the visible element can define a boundary for a cooking element.

Abstract: A mounting device for an electric cooker plate in which the relatively heavy cooker plate (11) is so mounted in a stove top plate (19) of glass, that even during transportation, destruction of the glass stove top plate under lateral impacts will not, or is unlikely to, occur. The device includes U-shaped centering U-profiles (46) which are mounted on the inner face of an insert ring (31), which rests in a rubber profile (26) surrounding the mounting opening (50), the insert ring and rubber profile absorbing the affects of the impacts.

Abstract: A radiant heater has a shallow shell-like support for carrying heating resistors and a glass ceramic top plate. A connection and hot warning indicating device is arranged in the space between the top plate and the support. The light source is preferably a low voltage tungsten halogen lamp which projects, at most, slightly beyond the front side of the support. Despite a very compact construction, the radiant heater is not subject to dazzle effects even over a large area, and a readily visible indicating illumination is obtained. The light source can be operated at different brightness levels, for example one brightness level indicating the switched-on condition of the heating resistor and the other brightness level indicating the hot-to-touch condition of the top plate, notwithstanding the switched-on or switched-off condition of the heating resistor.

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: In a radiant heater (1) a support tray (3) receiving the radiant heating elements (10, 11) and hotplate (4) are displaceable with respect to one another by sliding guides (27) immediately adjacent to hotplate (4) and are self-adjustably tensioned with respect to one another by tension springs that an insulating material bearing rim (9) of support tray (3) always reliably engages on the inside of hotplate (4). The thus formed, self-adjusting unit can be supported as an entity on base (6) by means of actuating spindles (31), so that its level can be adjusted at any time without impairing the engagement of support tray (3) on hotplate (4).

Abstract: In a cooking unit (1) in the marginal region of the underside of hotplate (3) a tensile stressed support (4) is fixed immediately adjacent to the outer circumference (8) of a radiant heater (2). Support (4) engages below a cover (13) of the insulation of radiant heater (2) serving as a base plate and at least one spring (22) is arranged between a marginal strip (16) and the underengaging leg (19), so that a prestressed, closed assembly for fitting in a hob or the like is formed. Appropriately there are several closely juxtaposed, rectangular radiant heaters (4) with in each case separately switchable or regulatable heating circuits, so that at least approximately 85% of the total surface of the cooking field can be directly heated.

Abstract: A sealed electric hotplate is to be provided, which can be simply fitted by lateral insertion into a hob. For this purpose a hotplate with a cast metal body is surrounded by a very wide trim ring, which is provided with centering projections. The wide ring is separately grounded, in that a grounding line is provided between the trim ring or the hotplate body or the plug-in connection.

Abstract: In an electric hotplate (1), the casing (15) of a thermal cutout (14) integrated with a projecting expansion rod temperature sensor (16) is open or unclosed on the top side, so that its reception depth for receiving the associated limiter switch is open upwards towards the underside of the hotplate body (2). On either side of the opening of casing (15) located in said top side (17), the casing is provided with spacers (18, 19) in one piece therewith and projecting upwards to different heights for engaging on the associated sloping surface (13) of the underside of hotplate body (2). Thus, in the case of simple manufacture, a good ventilation of casing (15) is obtained.

Abstract: A temperature regulating device with a hydraulic regulator for medium heating has a sensor tube in a closely surrounding protective jacket, which is connected directly in good heat conducting manner with a separate sensor heating element in the form of a tubular heater. This sensor heating element is located with the sensor tube in the medium to be heated, which is to be heated by a separate heating device located outside the medium. Through the simultaneous operation of this heating device and the sensor heating element, there is a significant reduction in the operating differential of the switching or control member.

Abstract: An electric hotplate (1) with a temperature sensor (21) of a power control device provided in the center of the cooking surface (3) has on the underside of area (5) of hotplate body (2) directly heated by heating resistors (7, 8) a thermal cutout (27) with rod-like temperature sensors (28) projecting freely from a switch casing (29). Switch casing (29) is located outside a cover (17) of underside (4) of hotplate body (2) and temperature sensor (28) is located within said cover. In the case of high switching precision of thermal cutout (27), the limiter switch is still not damaged if the thermal cutout is set to relatively high cut-off temperatures.

Abstract: An electric hotplate, particularly intended for continuous operation in commercial use, is provided on the bottom surface with at least two superimposed reflectors (24, 28), which in each case form the lower boundary of an insulating zone (29, 30) and while incorporating an outer flange edge (4) of hotplate (2) seal the bottom surface thereof. This leads to a very low no-load power of the electric hotplate with a very rapid response to a higher power setting.

Abstract: A controller has an axially releasable locking unit operable to prevent rotation of a regulating shaft from at least one locking position, without first axially moving the regulating shaft. This push-to-turn or pull-to-turn locking unit is arranged entirely outside of a housing of the controller, and is arranged with mounting particulars matched to those of the controller such that the same controller assembly can be used interchangeably either with a push-to-turn locking unit or without such a unit.