Abstract: The method relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of easily solderable or weldable ignoble metal, and method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made from the easily solderable or weldable ignoble metal, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block in a reducing atmosphere or in an inert atmosphere or in a vacuum, avoiding the formation of fluid eutectics from the silver of the composite material and from the non-precious metal with which the block made f

Abstract: The invention relates to a method for producing a strand-like, particularly band-like semi-finished part for electrical contacts, wherein the semi-finished part has a top side intended for making the electrical contact, said top side made from a silver-based composite material in which one or multiple metal oxides or carbon are embedded, and has a carrier layer supporting the composite material made of silver or a silver-based alloy, said method having the following steps: Powder-metallurgic production of a block made from the silver-based composite material, encasing of the block made of the composite material with a powder made primarily of silver, compressing the block, encased by the metal powder, to condense the metal powder, sintering the compressed block, reshaping the sintered block by extrusion pressing, creating a partial strand with a top side made from composite material and a bottom side made from silver or a silver-based alloy.

Abstract: The invention discloses a semi-finished product for making plug-in contacts in plug-in connectors for electric DC power systems in motor vehicles which are operated at a nominal voltage at which electric arcing may occur, having an electrically conductive main body made of a non-precious metallic material that carries, at least in part, a contact-making coating of a material more precious than the material of the main body. It is provided according to the invention that the coating has thickness of at least 0.3 ?m and consists of silver or of a silver-based alloy with an addition that will not form an alloy with silver or with the silver-based alloy, or will at best form a precipitation alloy, and which has a higher melting point than silver.

Abstract: A method for generating a surface that can be bonded with gold wire. The surface is obtained by first depositing an exchange palladium layer made of the electrolyte on conductors of printed circuit boards, in particular on conductors made of copper or conductive paste. The exchange palladium layer is then reinforced with a palladium layer, deposited from a chemical palladium electrolyte. In order to protect the palladium, an exchange gold layer is then applied. An exchange palladium bath is used, comprising an organic brightener.

Abstract: The invention relates to a quenching plate made of a matrix composite material, comprising a ferromagnetic phase in which a high temperature stable phase is embedded. Example of an embodiment: In order to produce the matrix composite material, 96 wt. % iron and 4 wt. % MgO are mixed. The powder mixture is pressed into green plates. The green plate are sintered and rolled into the desired thickness of 0.8 mm to 1.2 mm The rolling can be done in several rolling steps, between which the sinter plates are aged. After the last rolling step, the sinter plates are preferably aged once more. The plates produced of the matrix composite material in said way are then coated galvanically with a 5 to 10 micrometer thin electrically conductive layer, for example a copper layer.

Abstract: The invention relates to a coated arc splitter made of a ferromagnetic material for use in an arcing chamber. The invention provides that the arc splitter has a layer made of a composite material consisting of at least two constituents of which the first constituent is electrically conductive, has a melting point which does not exceed that of the ferromagnetic material, and has a vaporization point which does not exceed that of the ferromagnetic material, and of which the second component has a melting point higher than that of the first constituent, and has a vaporization point higher than that of the first constituent.

Abstract: An electric contact comprises a main body consisting of a copper-based alloy or of stainless steel and a contact layer consisting of a gold-based alloy. The contact layer has a thickness of at least 0.3 ?m and consists of gold with a content of 0.5 percent by weight to 15 percent by weight of one or more platinum group metals, and that an intermediate layer consisting of silver or of a silver-based alloy or of nickel is provided between the main body and the contact layer. The contact layer is preferably applied on the main body by a PVD process.

Abstract: A tire pressure monitoring device includes a pressure measurement sensor provided on each of the wheels to be monitored, a transmitter arranged near each pressure measurement sensor for sending signals representative of the pressure determined by the pressure measurement sensor, respective antennas for receiving the signals, the antennas being arranged on the vehicle chassis near the respective wheel. Each antenna is formed by making use of a separate electric line belonging to another monitoring system that is associated to the same wheel or is formed by making use of a sensor belonging to another monitoring system associated to the same wheels. Alternatively an electric line that leads to another consumer which is associated to the respective wheel, like a lamp, is used as an antenna.

Abstract: An arrangement made up of an electrical circuit board (7) and an electrical pressure transducer (1) which has, in a housing (2), a pressure sensor onto which the pressure to be measured is transferred by means of a fluid through a channel (5) leading into the housing (2), and from which there proceed electrical lines which project out of the housing (2) as leads (4) and are connected to the circuit board (7). The channel (5) is shielded on the outer side of the housing (2) so that the flow resistance for fluid entering and leaving the channel (5) increases.

Abstract: An apparatus for monitoring tire pressure on automobiles, having an arrangement (1), intended for installation into a wheel, made up of a pressure sensor, a transmitter, and a circuit for operating the pressure sensor and transmitter, and having a battery (2) which supplies the circuit with power via a power supply line (3), the arrangement (1) and the battery (2) being located in a sealed housing (9). Located in the power supply line (3) is an electronic switch (4) which has a control electrode (5) and is nonconductive when the control electrode (5) is connected to ground.

Abstract: A method of operating a device for monitoring vehicle-tire pressures and indicating changes in pressure by radio, which is arranged in the valve of the pneumatic tire and contains a power source; a pressure sensor; an analog/digital converter for digitizing the pressure signal obtained from the pressure sensor; a memory for storing the pressure signal; a transmitter; a comparator, in particular in a module with a microprocessor, which compares the pressure signal with a previously stored comparison pressure signal, generates a signal if the deviation of the pressure signal from the comparison pressure signal exceeds a threshold, and activates the transmitter, which thereupon transmits a datum regarding the detected deviation to a receiver arranged in the vehicle; and a timing switch which activates the device at time intervals for a measurement and comparison operation and otherwise keeps it deactivated for purpose of power conservation.

Abstract: A method for processing signals of a tire pressure monitoring system on vehicles on each of whose N wheels (R1 through R5) a transmitter is mounted and a reception antenna (1 through 5) which is connected to the input of a common receiver (8) is allocated to each transmitter in its vicinity, the transmitters transmitting, at time intervals, data telegrams which contain an individual identifier and a data portion following the latter. The signals received simultaneously from the reception antennas (1 through 5) and having the same identifier are conveyed in summed fashion to the receiver (8), alternately from all N reception antennas (1 through 5) and from N-1 reception antennas (1, 2, 4, 5), such that the one reception antenna (3) whose signal is blanked out of the sum of the signals is selected by cyclical transposition from the total number N of reception antennas (1 through 5).

Abstract: A method for allocating transmitters and receiving antennas in tire pressure monitoring systems which consist of a pressure sensor, a transmitter, and a transmitting antenna at each wheel, of a receiving antenna respectively allocated to them on the body, and of an electronic receiving and analysis system connected thereto via cables. In this, an identifier characterizing the wheel is allocated to each transmitter, and the signals are forwarded to the central electronic receiving and analysis system.

Abstract: An RFI shielding hood with an integral RFI filter arrangement for a distributor cap, so constructed as to provide strong attenuation in a predetermined broadcast and radio-telephone frequency range.

Abstract: A material for electric contacts based on silver-tin oxide is obtained by mixing a powder of silver or an alloy mainly containing silver with a powder consisting mainly of tin oxide and 0.01 to 10 wt. % (in relation to the quantity of tin oxide) of an additive consisting of one or more compounds containing silver, oxygen and a metal from sub-groups II to VI of the periodic system and/or antimony, bismuth, germanium, indium and gallium, compacting the mixture and sintering it. The tin oxide may be replaced by zinc oxide.

Abstract: Electric low current signals are transmitted through two-wire circuits having coaxial connectors which are closed by windings that are coupled transformer-like to the coaxial connectors. This arrangement allows transmission of control signals for electric power consuming devices within automobile doors, low frequency audio signals, and electrical power to power the electric consumers. All signals are transmitted on a common data cable. Control signals are in binary coded form, modulated onto a carrier signal, as are modulated, low frequency audio signals. The signals are demodulated in a door module and separated according to frequency. The low frequency audio signals are amplified and transmitted to a loudspeaker. The control signals are processed by a microprocessor controller in conjunction with switching units that create corrective actions for the power consuming devices located in the door.

Abstract: Control signals for electric consumers in vehicle doors and l.f. signals for loudspeakers in vehicle doors are transferred from a control apparatus (1) provided outside of the door over a common data line (42, 43) to a door module (20, 30). For this purpose, in the control apparatus (1) the control signals are modulated in binary-coded form onto a carrier signal and onto the same carrier signal there is also modulated the l.f. audio signal. In the door module 30) the signals are demodulated and separated according to frequency. The l.f. signals are amplified and fed to a loudspeaker (4, 5). The control signals are evaluated by a micro-controller (24, 34) and they control over switching stages (23, 33), setting elements (6, 7) provided in the door. Conversely there is also possible a data transfer from the door module (2, 3) to the control apparatus (1).

Abstract: The device for the selective treatment of the surface of workpieces by flooding the workpieces with a treatment liquid comprises a bath (1), interchangeable holders (10) in the bath for the workpieces, at least one pip (15-21) leading into the bath (1) taking the liquid to the holders (10) and at least one outlet pipe (26) for the liquid leaving the bath (1). The holders (10) are fitted on an extractor (7) and in the side walls of the bath (10) there is a closable access (31) through which the extractor (7) can be removed.

Abstract: An electric microswitch includes a base and a cap. The base has a bottom pair of terminals downwardly extending that are hermetically sealed because they are integrally formed as part of the base, while the same terminals extend upwardly from the top of the base, and are in the form of spring contacts. The housing has a pair of apertured extensions that receive a pair of pins located on the housing. The cap includes internal stops that push the spring contacts together when the cap is acted upon while in a pivotable position so that contact pieces on the springs complete the circuit. When the housing is in a non-movable position, the spring contacts and contact pieces are hermetically sealed by the housing acting against a shoulder on the base.

Abstract: The invention relates to a material for electric contacts taking silver tin-oxide as basis, consisting of silver or mainly silver-containing alloy, tin oxide and other oxides or carbides of tungsten, molybdenum, vanadium, bismuth, titanium, and/or copper.