E.g.o. Elektro Gerate Blanc U. Fischer

E.g.o. Elektro-geraetebau Gmbh

Willi Essig

Robert Kicherer

Siegfried Mannuss

Franz Bogdanski

Hans Mayer

Guenter Fettig

Juergen Horn

Eugen Wilde

Heinz Petri

Gerhard Goessler

Lutz Ose

Ivo Russ

Mandred Schwarze

Edgar Hanss

Wilhelm Stricker

Bruno Lotter

On the one hand is provided an electric heating element ( ) consisting of a semiconducting ceramic ( ) as well as a method for its production. The semiconducting ceramic material may be porous or foamed to thus contain pores ( ) open outwardly. The pores are attainable by admixing filler bodies, which dissolve during sintering, to the starting material or by impreganting a textile substrate material ( ) with a ceramic material. Due to the porosity of the heating element ( ) an increased radiant surface area is attained. On the other hand is provided an electric heating element ( ) as well as a method for its production which consists of semiconducting ceramic and comprises a negative temperature coefficient of the electrical resistance. The temperature coefficient is negative throughout over the full operating temperature range. The material suitable for the heating element ( ) is doped silicon carbide or TiN. One such heating element ( ) may be put to use, for example, rod-shaped in a radiant heater body ( ) or foil-shaped at the underside of a surface element ( ) of a cooktop ( ). The electric conductivity of the material of the heating element ( ) can be adjusted by nitrogen absorption during annealing in a nitrogen atmosphere subsequent to the sintering process.

Electric heating element and method for its production

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.

Inductive cooking point heating system

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.

Induction cooker heating system

An induction based point heating system for cooking utensils or the like contains induction coils positioned below a plate, e.g. a glass ceramic plate. It is constructed as a cohesive component and includes induction generating means and the associated power, frequency generation or control electronics for the induction coils. The component is in the form of a flat plate or tray, which can be pressed from below against the plate. The induction coil is constructed as a flat, disk-like coil, which on its side remote from the plate is adjacent to a magnetic yoke such as a preferably segmented ferrite layer.

Inductive based cooking system

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.

Base for an electromechanical functional unit

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.

Device for detecting a cooking vessel positioned in a heating zone of a

In an electric switching device (1), particularly constructed as a temperature regulator, the resilient switching arm (14) controlled by a hydraulic expansion cell (12) for operating a snap switch (5) is fixed by means of positively engaging snap connections (32) to plate-like support parts (20) of a sheet metal support body (3) of a body (2), the support parts (20) on either side of the switching arm (14) being at right angles to joint axis (25) of arm (14) as lateral bends to a base plate (30) of support body (3) and receive between them an end portion of an insulator (4) carrying the switch (5). This leads to an extremely favourable taking up of forces, so that the support body (3) can be made from extremely thin sheet metal as a relatively elastic component. It also leads to a very simple assembly of the switching arm (14).

Switching device

In a temperature limiter (1) with a rod-like temperature sensor (6), the outer tube is formed by a continuously tensile-stressed insulating tube (7) extending into a base (2). An inner rod (8), optionally articulated two or more times in the longitudinal direction, is constructed as a continuously pressure-loaded rod, characterized by temperature-dependent length expansion. The temperature limiter (1), e.g., for a glass ceramic unit, may have a circuit breaker (5) closer to the temperature sensor, and a more-remote signal switch (4). In that case, for operating the remote signal switch, a flat bar-like transfer member (9) traverses both switches through openings (54). The transfer member is coupled at the associated end and in adjustable manner with an operating member (30) for the signal switch (4), receiving the adjustment member (34). The parts are constantly held together in clearance-free manner by the tension of a restoring spring (40).

Temperature limiter

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.

Electric switching device, operable for power control

A fastening mechanism for mounting operating equipment or the like, particularly on electric household equipment has bayonet catch-like tension members for engaging in a panel. Each tension member can have in a slightly resiliently movable region on one side, a shoulder surface for the inclined supporting on the outside of the panel and on the other side can have a wedge surface for the self-cutting engagement in a boundary edge of a passage opening of the panel. Accompanied by self-compensating position adaptation, the tension member is not only braced with the shoulder surface under pretension against the outside of the panel, but is also wedged at right angles thereto in the passage opening.

Fastening mechanism for mounting operating equipment and the like

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.

Controller for controlling electrical heaters

A power control includes a thick film resistor on an electrically insulating support plate, for heating a bimetal strip operating switch contacts connecting power to a load, and to the resistor. The support plate is secured and the resistor thereon is electrically contacted by means of a resilient clip at one end, in the vicinity of a fixed end of the bimetal strip. An opposite end of the support is connected to a power source via a movable contact spring. An opposite free end of the bimetal strip acts directly on the switch contacts to disconnect power upon bending of the bimetal strip with heat. The bimetal strip and a control operator for biasing the bimetal strip are shaped like an L, with two legs pivotable around a pin adjacent the base of the bimetal strip.

Electrical heating system for a bimetal, particularly for an electrical

In a thermal cut-out for a heating means, e.g. a glass ceramic cooking unit, a signal switch and a circuit breaker are operated by means of a temperature sensor via a transfer member externally surrounding the switches and whereof the actuating member thereof located further from the temperature sensor is formed by an adjusting member, so that with the latter and also an adjusting member directly associated with the temperature sensor, a very precise setting is made possible. The transfer member is suspended in contact-free manner between oppositely acting springs and is therefore mounted in a substantially frictionless manner.

Thermal cut-out

A temperature sensor for a temperature limiter is made up of an outer tube and a number of inner component rods. The temperature sensor extends transversely over the top side of a moulding of a heating system for a glass-ceramic cooking unit. The heating system comprises a central heating surface and an outer connectable heating surface disposed in a circle therearound. Disposed in the zone of the central heating surface is an inner component rod whose coefficient of expansion is lower than that of the outer tube, while in the zone of the connectable heating surface the component rods have a higher coefficient of expansion than the outer tube.

Temperature limiter for a glass-ceramic cooking unit

A mechanism for mounting a control device on an implement shield defining a shield plane, the control device having a body formed with slots, the mechanism comprising: the shield having a guide with guidance projections slidably interengageable with the slots on the body of the control device, the guidance projections and slots being connectable to one another by relative movement parallel to the shield plane; the shield having at least one positioning stop forming an abutment against the connecting movement; and, the shield having at least one stop spring for resiliently urging the body against the at least one positioning stop after the connecting movement, whereby the control device is securely positioned on the shield. When the control device is to be mounted in a cutout in the shield, the guidance projections, the at least one positioning stop and the at least one stop spring are shaped from material of the shield bounding the cutout. The guidance projections are preferably straps of L-shaped cross-section, projecting firstly from the shield towards the interior of the implement and then toward one another, engaging in the slots in the body of the control device. In an alternative embodiment, the mechanism may further comprise a sheet metal plate covering the front surface of the body, having bent edges for engaging in the slots in the body, having threaded or plug-receiving retainers and having a securing slot for the setting shaft of the control device.

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Boeblingen, Germany

Willi Essig