Abstract: This invention concerns a sensitive key device with capacitive effect working through an electrically insulating plate, the key being supported by a printed circuit board. According to the invention, the bottom of a single part having a spring blade made of an electrically conducting material is fixed to the printed circuit board. The top (11) of this part forms a detection surface designed to be placed in contact with the transparent plate. The center of the part makes the part flexible such that the detection surface is in elastic contact with the plate, regardless of parallelism defects between this plate and the printed circuit board.

Abstract: The disclosed induction cooking range comprises, in the commonly known way, an upper plate made of glazed ceramic designed to receive a receptacle to be heated made of ferrite material, a monoconductor induction coil positioned beneath the upper plate on a coil support and excited by a high-frequency current generator. The induction coil is allowed to heat by its own losses to a temperature greater than that of the receptacle and the induction coil communicates its own heat to the receptacle. The overall efficiency of the range is thus appreciably increased. The induction coil, which must then tolerate a high temperature, is made out of a flat, monoconductor strip placed between two sheets of mica.

Abstract: In a device for the control of a circuit comprising a resonance inverter power supply for at least one load comprising an inductive component, the inverter power supply comprises at least two switches (Q.sub.1, Q.sub.2) mounted between the terminals of a DC voltage supply. The device has a current transformer (TR) comprising a primary winding (TRp) series-connected between the load and the common junction point between the switches (Q.sub.1, Q.sub.2), the freewheeling rectifiers (D.sub.1, D.sub.2) and the snubber capacitors (C.sub.1, C.sub.2); a first secondary winding (TR.sub.S1) connected between the emitter of one (Q.sub.1) of the two switches and the first terminal of a first DC supply (E.sub.1), the second supply terminal being connected to the base of the switch (Q.sub.1); a second secondary winding (TR.sub.S2) connected between the emitter of the other switch (Q.sub.2)and the first terminal of a second DC supply (E.sub.2), the second supply terminal being connected to the base of this other switch (Q.

Abstract: An induction cooker comprises at least one cooking heater comprising an inductor, a generator delivering a AC current to supply the inductor and an element made of a non-magnetic, electrically conductive material to provide shielding against the disturbances generated by the inductor. The shielding function is improved by electrically connecting the element to the mains by means of a high-frequency filter of the generator. Preferably, the electrical link between the shielding and the filter comprises a capacitor.

Abstract: This invention relates to a process and a device for controlling power for a circuit comprising a resonant inverter intended to supply a variable impedance load comprising an inductive component. The invention renders the active power consumed by the load independent of the nature of the load by producing an error signal that is a function of an average value of a current passing through power transistors of the inverter, this error signal being used to control a power modulator controlling the switching of the power transistors. Such a process and device finds particular application to a circuit for controlling power supplied to an inducer and a cooking utensil.

Abstract: A device and method for regulating a cooking apparatus. In order to obtain an effective servocontrol of the desired temperature with a cooking surface, when cooking for example by induction, a servocontrol curve is used in the plane (i.e., temperature, variation of the temperature as a function of time). Each time the curve is crossed the heating power is cut off or reduced. The device and method applies principally to monitoring of the heating device. The device according to the present invention is particularly well adapted to cooking surfaces and especially to cooking surfaces wherein cooking is done by induction.

Abstract: A temperature-measuring device for an induction-type cooking appliance is disclosed with a heat measuring device for an induction-type cooking hob including a heat conductor for measuring the temperature of a sauce pan or its contents independently of its diameter or its bottom surface configuration. A heat conductor includes modifications which minimize the effects of currents provided by the induction heating. The device allows for the measurement of temperature during induction heating.

Abstract: A cook hob (1) possesses a device for the support of controls (10) which are mounted pivotably on a housing (7) equipped with a ventilation circuit. The device comprises a body (12) having a channel (13), one end of which forms the outlet port of the ventilation circuit. The body (12) can pivot between a position in which the controls (10) are accessible and the outlet port is open, and a position in which the controls are not accessible and the outlet port is closed.

Abstract: The invention relates to an electric oven with self-cleaning pyrolytic system, includes a catalyst for smoke or fumes, at least one vault resistance and one sole resistance of standard values, wherein the oven further comprises means for powering at the beginning of a pyrolysis operation, simultaneously and exclusively the vault resistance and a part of the sole resistance, so that the power supplied by this part of the sole resistance is lower than the power supplied by the vault resistance, and wherein the catalyst is produced from a material that allows its activation prior to the saturation of the oven by smoke or fumes, exclusively through the convection heat passing into a pipe housing the catalyst from the oven, and wherein means are provided for powering other resistances after the beginning of activation of the catalyst, in order to reach the pyrolysis temperature.

Abstract: Apparatus in the form of at least one cooking chamber, e.g. a cooker or an oven for building into a kitchen unit, with the cooking chamber being delimited by a generally rectangular muffle (20) having an open front face. Heater elements (41) are disposed inside the muffle and/or outside the muffle in a contiguous chamber, and a thermally insulating material (50) is moulded over the side walls of the muffle together with the contiguous chamber if present. The thermally insulating material constitutes the core of a frame for the apparatus and forms part of a structure which provides at least a portion of the outside walls of the apparatus. Moulding the insulating material directly over the cooking chamber facilitates manufacture and reduces heat losses through heat-conducting bridges.

Abstract: Apparatus for electrostatically depositing powder on objects which move continuously through a powder-depositing booth of modular type having a powder depositing module (B) on each side of which there is an air filter module (A and C); the powder depositing module (B) has two compartment (B1, B2) next to each other each compartment having a distinct powder store tank (11, 12) which allows two layers of powder to be applied successively to the object to be treated. Application to enamelling objects.

Abstract: An apparatus and method of using the apparatus for electrostatically depositing powder on moving objects. The apparatus includes powder-spraying chamber, air-filtering units adjacent the entrance and exit of the chamber, and at least one re-ionization chamber disposed between an air-filtering unit and the powder-spraying chamber. Each re-ionization chamber has walls extending transversely to the direction of motion of the objects through the apparatus to direct powder towards the objects on which powder is to be deposited.

Abstract: An electrostatic powder-depositing installation for depositing powder on hollow parts of large dimensions. It includes a powder-depositing cage (1) which is open at the top and a powder-depositing unit (41) placed beneath this opening (2) so that the hollow parts vertically fit over the powder-depositing unit as they pass through the opening of the powder-depositing cage. Application is to installations for coating parts and, in particular, metal parts.

Abstract: A fluidization unit comprising a fluidizer (2) and a chamber (1) for containing a granular, powdery or like substance (3) to be fluidized. The chamber has at least one air-tight wall and the fluidizer comprises an assembly of an air-tight base sheet member (5), a porous sheet member (4), and a peripheral sealing member (6), holding the sheet members apart in a fixed relationship. In operation, said fluidizer is placed in the chamber with its air-tight base member resting against an air-tight wall of the chamber. A preferred application is in the handling of powders for electrostatic enamelling.

Abstract: Apparatus for electrostatically depositing powder on objects which move continuously through a powder-depositing booth of modular type having a powder depositing module (B) on each side of which there is an air filter module (A and C); the powder depositing module (B) has two compartment (B1, B2) next to each other each compartment having a distinct powder store tank (11, 12) which allows two layers of powder to be applied successively to the object to be treated. Application to enamelling objects Figure to be published: FIG. 2.

Abstract: In a heat pump, thermoelements (20,22) are disposed in a thermopile (P1) and are electrically connected in series. Heat is transferred horizontally from the thermopile and vertical air ducts (28) at its sides by suitable arms (42) prolonging heat conductors inside the thermopile. The arms or webs serve to convey heat to heat exchange fins. Application to domestic heating.

Abstract: An installation for electrostatic deposition of powder on objects travelling continuously, by means of a conveyor, through a treatment cage with a side entrance and exit comprises a filtering system, a system for supplying powder and compressed air and a tank for recovery of powder. The cage comprises at least two modules, namely, a first module for storing, projecting and recovering powder, which contains elements for projection of powder onto the objects to be processed, and a second module for filtering and recycling the air in which the air loaded with powder originating from the first module is filtered and recycled to the first module. The cage includes at least one air lock to prevent escape of powder laden air to the exterior of the cage.

Abstract: A pyrolytically cleaned domestic cooking oven including a catalyst for combustion of the smoke evolved during cleaning, and a temperature sensor placed inside the catalyst and arranged to regulate the heating control of the oven during pyrolytic cleaning.

Abstract: The invention relates to a thermoelectric heat exchanger assembly including a liquid flow circuit. In a heat pump some of whose thermoelements (20,22) are disposed in a thermopile (P1), one of the heat exchange fluids is liquid and flows through the successive stages of the thermopile via a continuous metal tube (10) which has electrical resistance and is curved in a U configuration at each stage so as to increase the heat exchange area and to facilitate assembly. Application to domestic heating.

Abstract: Regulation of the temperature of a pyrolitically cleaned cooking oven during cleaning to avoid local overheating of the oven base plate enamel. A heating-up power level is used until near the pyrolitic temperature, and then a lower power level is used for maintaining the oven at about the pyrolitic cleaning temperature. The change over takes place preferably at about 470.degree. C.