Abstract: The ends of a fiber-reinforced resin rod are inserted through sealing grommets into cavities of respective end fittings; the end fittings of the assembly are placed in accurately spaced end moulds; the rod is encased in intermediate half shells; an insulator covering is moulded around the rod by filling the half shells; and the end fittings are then fixed to the rod by embedding or swaging.

Abstract: A tempered glass dielectric material for use as an electrical insulator is thermally tempered to produce surface compression between 200 MPa and 400 MPa. At least part of the material is then chemically tempered under conditions of temperature and duration such that the surface compression due to the thermal tempering is reduced by between 50% and 80%. The chemical tempering is effected by applying to the relevant part of the material, at ambient temperature, a solution containing alkaline salts. This solution is dried and the material then heated for several hours at a temperature between 300.degree. C. and 500.degree. C. The solution has the following composition (in percentage by weight):______________________________________ H.sub.2 O 70% to 90% Starch 2% to 10% KNO.sub.3 4% to 12% K.sub.2 HPO.sub.4 + KCl + K.sub.2 SO.sub.

Abstract: An electrical insulator component comprises a one-piece block of moulded fins (11, 12, 13) disposed around an insulating core (10). The surface of the block of fins includes a moulding line (21, 22, 23) and said moulding line has arcuately displaced segments in that the portion 22 extends circumferentially while the portions 21 and 23 extend longitudinally but in different planes. The net result is that dirt building up along the join line does not form a continuous straight-line low resistance path for leakage currents.

Abstract: A method of manufacturing a sintered silicon carbide ceramic part in which is formed a mixture of carbide powder with a sintering additive based on boron, beryllium or aluminium, and an injection moulding additive comprising a mixture of polystyrene and a wax. A moulded part is manufactured by injection moulding and is then baked and is finally sintered.Polystyrene is used simultaneously as a moulding agent and as a carbonizable substance. When the moulded part is baked it is heated in air to a temperature between 230.degree. C. and 330.degree. C. and is then kept at that temperature for a fairly long time to remove the wax and to reticulate and oxidize the polystyrene.Application to manufacturing dense sintered parts.

Abstract: An electric insulator which includes a rod (2) made of glass fibres and resin, one end of said rod being received in a fitting (1) made fast to a post (20). To improve the mechanical strength of the rod (2) in the anchoring means, a fitting (1) with a double cone recess is provided and the end of the rod has one or two grooves machined therein and is embedded in the recess in an organic substance (16). The grooves are formed only through the lower portion of the rod where the fibres are subjected to compression forces.

Abstract: An insulator core made of an organic substance and including a central rod (1) fitted with an insulating covering (4) is fixed in a metal cap (8) which is not machined.The end of the rod has undercut zones such as circumferential channels (10) or double cones (9), and a ductile metal cup (5) whose edges are made integral with the insulating covering (4) in a sealed manner is crimped on the rod. The cup (5) is itself embedded in the cap (8) by means of an organic cement or embedding substance (7) which is reinforced.

Abstract: A silicon nitride material is obtained by natural sintering in the presence of a small quantity of yttrium oxide. The method comprises the steps of mixing silicon powder with relatively small quantities of aluminum powder and yttrium oxide powder, nitriding the mixture of powders, re-crushing the nitrided mixture of powders, shaping the re-crushed powders, and then sintering the shaped re-crushed powders.

Abstract: The binding is disposed substantially symmetrically about a plane of symmetry which passes through the insulator and which is orthogonal to said conductor (10). It comprises a first ring (8) for occupying a portion of the circumferential groove, a second ring (9) for occupying the top groove, two conductor-retaining branches (5), and tightening means (2, 11) for tightening the binding. Each of said branches comprises a first end portion (7) in the form of a preformed spiral retainer for wrapping around said conductor, an intermediate portion for threading through said second ring when lodged in the top groove and through said first ring when lodged in the circumferential groove, and then extending in an arc of the same diameter as the circumferential groove to a second end portion which provides an eye (6) for engaging the tightening means.

Abstract: The binding is disposed substantially symmetrically about a plane of symmetry which passes through the insulator (1) and which is orthogonal to said conductor (5). It comprises a ring (10), two conductor-retaining branches (11, 6), and tightening means (21, 22) for tightening the binding. Each of said branches comprises a first end portion (8, 9) in the form of a preformed spiral retainer for wrapping around said conductor, an intermediate portion (6) in the form of an arc of a circle having a radius of curvature that is substantially equal to the radius of the bottom of said circumferential groove, and a second end portion providing an eye for engaging the tightening means. Both branches pass through the ring at the transition between their spiral end portions and their intermediate arcuate portions. At least one elastomer block (20) is inserted between said eyes to be held in position by said tightening means drawing said eyes towards each other.

Abstract: The member is in the form of a hollow body having a skirt (2) surmounted by a head (1), the entire body exhibiting circular symmetry about an axis (10). The hollow body has an internal ring (5) at an intermediate level between the head and the skirt. The surface of the internal ring is corrugated as traced by a generator line at a constant angle to said axis and moving around a closed corrugated curve situated in a plane orthogonal to said axis. This arrangement provides resistance to torsion forces without requiring any sharp inside edges that are difficult to manufacture in tempered glass.

Abstract: A tool having two side rods spaced apart by a connecting crossbar facilitates clamping and unclamping a cable in a groove on an insulator cap. To clamp the cable, the crossbar is inserted into a first recess on the cap between the groove and a protruding stud, and the side rods are pressed against a front branch of a clamp wire pivotally mounted on the cap to snap the front branch into a second recess below a front guide surface on the stud. To unclamp the cable, hooked extensions of the side bars engage the front branch of the clamp wire and lift it out of the second recess when the crossbar is pressed against the front guide surface of the stud. Separate clamping and unclamping tools can be mounted on an insulating handle for pivoting between a rest position and an operating position and spring biassing means can be provided to urge each tool toward a rest position.

Abstract: The invention relates to a static cylindrical monolithic cellular structure with a large contact area, said structure being used in particular for a static heat exchanger and including a plurality of parallel ducts. Its general organization is essentially cylindrical, and the ducts are defined by radial walls (10) and circumferential walls (11). Said ducts form groups for conveying different fluids with the groups being in an essentially radial configuration, i.e, with groups for conveying different fluids at least some of the radial type walls constituting the boundaries between different fluid flows. Application in particular to static exchangers and to filters.

Abstract: The invention relates to line insulators made of organic material. Such an insulator comprises a bar (7) of high tensile strength, a protective sheath (8) made of an elastomer material, a plurality of fins (4) and an anchor fitting (2) at each end. In accordance with the invention, at least one inner part of the insulator is semiconductive along the whole length which separates the anchor fittings (2); this part may be constituted either by the sheath (8) itself or by the bar (7) and the bedding material in said fittings. Application, in particular, to line insulators intended for use in highly polluted zones.

Abstract: The invention relates to the manufacture of a body of a cellular structure by extruding a ceramic material through a die. The die comprises a succession of coaxial components (6, 10) fitted one round another, with two adjacent components defining between them longitudinal ducts (2) whose downstream ends communicate with an annular duct (3) and wherein the bottoms of said coaxial components fitted one round another have essentially radial notches (4) level with the annular ducts, the width of said notches being less than that of the longitudinal ducts, so that the ceramic material which flows through said longitudinal ducts is evenly distributed in the annular ducts and in the radial notches to form a body with a cellular structure directly on extrusion.The invention has application to thin-walled honeycomb ceramic structures.

Abstract: The invention relates to fixing a metal strength member on a non-metal part. A heat-resistant fibre glass layer is inserted between the strength member and the non-metal part, the layer extending throughout at least the zone of the non-metal part which corresponds to the point where the molten metal which forms the strength member is injected and being coated with a non-adhering inert inorganic substance so that the layer is thus compressed between the non-metal and the metal part when the metal part is applied against the non-metal part. Application in particular to manufacturing tempered glass electric insulators with moulded aluminium caps.

Abstract: An insulator which includes at least one plate-shaped dielectric component 3 having a cylindrical head 4, at least one connecting member 14 having at least one pin end 5 embedded inside a recess defined within the head of a dielectric component and at least one other connecting member having a cap 12 which covers the head of the dielectric and is sealed thereon, the one connecting member having a flange (15, 27, 28, 29) spaced from the embedded pin end and whose outer diameter is larger than the outer diameter of the head in which said end is embedded and the cap of the other connecting member having a flared base (16, 30, 31, 32) which covers an annular portion of the dielectric which extends beyond the outer diameter of the head, so as to define a rigid extension on either side of the dielectric component.The invention applies in particular to multiple-dielectric insulators in which the dielectric components are made of tempered glass.

Abstract: A ceramic unit for indirect heat exchange, said unit being formed by extruding raw ceramic material in a parallel duct configuration, piercing a first series of inlet and outlet orifices for a fluid at the ends of a first series of ducts, the axes of said orifices being perpendicular to those of the ducts, and firing the unit. The inlet orifices (5) and/or the outlet orifices (9) are formed by making oblique cuts (7,10) on the ends of the rows of ducts to provide inlet or outlet openings perpendicular to the common direction of the ducts and then closing off the ends of the obliquely cut rows. Application to heat exchangers for turbine engines.

Abstract: The invention relates to line insulators made of organic material. Such an insulator comprises a bar (7) of high tensile strength, a protective sheath (8) made of an elastomer material, a plurality of fins (4) and an anchor fitting (2) at each end. In accordance with the invention, at least one inner part of the insulator is semiconductive along the whole length which separates the anchor fittings (2); this part may be constituted either by the sheath (8) itself or by the bar (7) and the bedding material in said fittings. Application, in particular, to line insulators intended for use in highly polluted zones.

Abstract: The invention relates to fixing a bare cable on an electric insulator by means of a device which includes a fixed part integral with the insulator and which has a groove (5) which forms a cradle in which the cable is laid, as well as a moving part (8) which holds the cable in its cradle in the locked position. According to the invention the fixed part and the moving part have contact surfaces with the cable to be fixed such that said cable in the locked position is subjected to progressive deformation of its cross-section in a first direction substantially perpendicular to the direction which corresponds to the clamping of the moving part at the central portion of the cradle and in a second direction substantially perpendicular to the first direction at the two ends of the cradle. Application in particular to support insulators and to suspension insulators.

Abstract: A titanium or titanium alloy pin for cement-free fixing in a long bone for a joint prosthesis or for bone repair, said pin being surrounded by a lattice of titanium wire with a mesh size of at least 0.3 mm. The pin has a rectangular cross-section and two of its surfaces have respective longitudinal grooves (3) which are notched transversely to form shoulders (5) perpendicular to the pin axis, said shoulders giving the pin a scaly profile. Application to a total prosthesis of the hip.