Abstract: Brush holder for an electrical swivel, wherein the brush holder is provided with an electrically conductive body, provided with means for connecting the body to a feed line for electrical energy and provided with at least one recess for receiving a brush adapted to transfer electrical energy towards a connector, wherein the brush is connected to the body by means of an electric wire for the transfer of electrical energy from the body towards the brush and by means of a spring for allowing the brush to be pushed out of the recess and to protrude from the surface of the body adapted to face the connector and for urging the brush against the connector.

Abstract: Brush holder (1, 1?) for an electrical swivel, wherein the brush holder (1, 1?) is provided with an electrically conductive body (10), provided with means (11,12) for connecting the body (10) to a feed line (30) for electrical energy and provided with at least one recess (13) for receiving a brush (40) adapted to transfer electrical energy towards a connector (20), wherein the brush (40) is connected to the body (10) by means of a electric wire (14) for the transfer of electrical energy from the body (10) towards the brush (40) and by means of a spring (41) for allowing the brush (40) to be pushed out of the recess (13) and to protrude from the surface (80) of the body (10) adapted to face the connector (20) and for urging the brush (40) against the connector (20).

Abstract: The invention provides a turbomachine including a device for supplying pressurized gas, the gas being bled from the compressor of the turbomachine via a bleed orifice and cooled in a cooling cavity disposed within the compressor rotor upstream of the bleed orifice. This arrangement has the effect of cooling the bled gas by heat transfer through the outer wall of the compressor rotor to the gas stream which is being compressed by the compressor upstream of the bleed orifice, and has the result of reducing the drop in the performance of the compressor as a result of the gas being bled off.

Abstract: A turbine vane-system cooling system uses three internal cooling cavities 1, 12, 13) separated by two radial walls (9, 10). The upstream cavity (11) uses a helical ramp (30) and is fed through an intake (22) at the vane root (3). The middle cavity (12) also is fed at the vane root (3) and includes a compartmented, multi-perforated lining (40). The air is exhausted from each compartment through impact orifices and enters the succeeding compartment through slots (42) and then is finally exhausted through a vane-head orifice (21). The vane side walls opposite the downstream cavity (13) have double skins with bridging elements. The air passes through these double skins but circulates centrifugally in the upstream portion (15) of the downstream cavity (13) and enters this cavity's downstream portion (16) to be exhausted through slots (19) in the trailing edge (6). A third wall (14) divides the downstream cavity (13) into two parts (15, 16).

Abstract: A method of manufacturing a hollow machine blade consisting of two skins ining an internal cavity and interconnected by stiffeners comprises:forging and machining the primary components of the blade, including forming a reserve of material in localized regions of the inner faces of the skins, trunnion forming elements at the ends of the components, and locating holes in the components;deposition of diffusion barriers involving application of a mask, cutting the mask to a predetermined pattern using a special-purpose tool, peeling away portions of the mask, deposition of a coating product, peeling away the remainder of the mask, prefiring treatment, cleaning and checking;assembly of the primary components followed by isostatic-pressure diffusion welding; andsubjecting the assembly to inflation under gas pressure and superplastic forming in a mould in order to shape the skins and form the interconnecting stiffeners, including the steps of cold-debonding the primary components, causing flow of the material reser

Abstract: A circuit arrangement for the compensation of voltage variations of the electrical AC polyphase power line for an AC-DC converter (3).The invention comprises a first circuit (5) for determining the voltage variations at the input of each trigger rectifier (Th.sub.1, Th.sub.2, Th.sub.3) of a converter (3) and a compensating circuit (6) for compensating the firing angle of each trigger rectifier. The compensating circuit (6) is connected to an output (7) of the first circuit (5) for determining the variations in the input voltage of each rectifier. Outputs of the compensating circuit (6) are connected to control inputs of the pulse generator (4) for controlling the firing angle of each rectifier so as to adjust the period of the firing pulses of each trigger rectifier (Th.sub.1, Th.sub.2, Th.sub.3). The invention is particularly applicable to electrical DC power supplys for data processing systems.

Abstract: A mechanochemical method of etching the side wall of circular semiconductor plates, and apparatus for performing the method. The plates are given a rotary movement while their side walls only are contacted with an etching solution, the rotary movement being produced by rotation of at least one cylindrical roller dragging along a film of the etching solution.

Abstract: A matrix printer comprising one or more identical groups of printing wires which are guided in ducts in stackable plates of synthetic material. In the case of a plurality of stacked groups, the distance at the area of the printing ends of the wires between two adjacent ducts in two different groups equals the distance between two adjacent ducts of the same group. Different paper widths can be accomodated and characters of different dimensions, curves, patterns and so-termed negative characters can be printed without movement of the groups.