Abstract: The invention relates to electrically conductive pigments, wherein the pigments exhibit a ferromagnetic core and at least one electrically conductive coating, and the electrically conductive coating is or comprises a metal or a metal alloy or the electrically conductive coating is or comprises electrically conductive polymers or plastics materials containing electrically conductive polymers. The invention further relates to a process for the production of said electrically conductive pigments, and to the use of said electrically conductive pigments.

Abstract: Power supplies are known, in particular power supplies under primary clock-pulse control, that comprise a closed housing for the primary and secondary circuits, and a forced-air cooling means to cool the heat-producing components of the circuits. A power supply is proposed in which additionally there is a ventilation conduit in communication with the air outside the housing to serve as a cooling medium. The cooling means also comprises at least one cooling-unit element, on which the heat-producing components are mounted, and a portion of said element projects into the ventilation conduit and is electrically isolated by insulating means.

Abstract: An automatic air gap readjusting assembly in a clutch or brake unit is operated by electromagnetic and spring forces. A drive shaft 3 frictionally mounts, by a plurality of O-rings, an adjustment member. The adjustment member is readjusted by a contact or armature plate such that the air gap between the armature plate and the electromagnetic mechanism attracting the armature plate will remain constant, i.e. the stroke of the armature plate will remain constant. Torque is transmitted from the drive shaft to the armature plate via a radial flange having a plurality of axially movable torque transmitting bolt assemblies, which are clamped to an annular spring member secured to the armature plate. This arrangement allows for continuous readjustment for wear of the air gap between the armature plate and the electromagnetic mechanism; furthermore, the readjustment always takes place under uniform force conditions despite increasing wear.

Abstract: A rear wall for a standard housing, which housing is adapted for receiving electronic assemblies. The rear wall is provided by an enclosure in the form of a hollow body with mounting flanges for mounting the hollow body to one end of the housing so as to form a housing rear wall. A power pack for supplying power to the electrical assemblies is mounted in the hollow body so that heat may be transferred and carried off towards the outside of the housing. Ventillators and vent openings are provided in the hollow body to enable forced ventilation cooling of the power pack as well as to enable heat transfer from the housing interior. The mounting flanges are positionally located on the hollow body so that the formed housing rear wall is provided within the housing interior and the hollow body extends from the housing rear wall outwardly so as to partially project from the housing.

Abstract: A rack for accommodating circuit boards includes a pair of metal end plates joined by pairs of front and rear extruded metal tie bars. Slotted guide rails moulded from plastics materials are capable of being snap fitted into position between the front and rear tie bars.

Abstract: A bus bar for a card frame for receiving circuit cards, said bus bar comprising a carrier having a recess of U-section, an electrically insulating housing press fitted into said recess and having side walls which are relatively movable, and a plurality of electrically conducting strips, separated by electrically insulating foils, the strips being disposed side by side within the housing and held therein by lateral pressure from said housing.

Abstract: A rack for circuit boards in which connections are established not only to the rear ends of the board but also on at least one longitudinal edge of a board to bus strips extending at right angles to the boards by cooperating contact blocks on the boards and on the bus strips which establish electrical contact when a board is fully inserted into the rack.

Abstract: A bus bar for a card frame for receiving circuit cards comprises a one-piece electrically insulating housing having a recess of U-section, a stack of insulating strips separated by insulating foils disposed within the recess with one strip in contact with the base of the recess, a cover member clipped to the open end of the housing and a pad of resilient material disposed between the cover member and the stack.

Abstract: Measuring channels with ionization detectors as primary input are supervised by monitoring any imbalance between AC and DC components of the measuring currents, primarily to detect insulation failure of the connecting cable on account of heavy radiation and thermal losses. Detection of the imbalance is independent from radiation changes to be measured.