Abstract: A process and apparatus for controlling the deposition of roving by winding or by contact on large structures, in which deposition is carried out on a mandrel (1) driven in rotation about its axis (.theta.). A deposition head (6) is adjustable in position along at least a first rectilinear axis (X) of movement parallel to the axis of rotation (.theta.) of the mandrel. The head (6) is also movable along a second axis of rectangular displacement (Y) orthogonal to the axis of the mandrel. The axis of rotation (.theta.) of the mandrel is taken as a master axis and the other axes (X, Y, .beta., .gamma., 8, 9) are made subservient to the master axis. The master axis (.theta.) is controlled by speed orders according to a pre-established program and from a pre-established trajectory table (21). The slave axes are made subservient as a function of the angular position of the master axis, from the instantaneous angular position of the master axis (.theta.

Abstract: The present invention concerns a plasma torch with an integrated independent electromagnetic coil for moving the arc foot. The torch includes a bare torch portion housing a single upstream electrode or a pair of coaxial upstream and downstream electrodes. The electrodes are tubular and are cooled by an appropriate cooling circuit. An injection mechanism injects plasma gas downstream of the upstream electrode or between the upstream electrode and the downstream electrode. A starter mechanism ensures starting of the torch. A field coil moves the arc foot. The field coil has a generally cylindrical shape and is formed of a set of three supports made of an electrically non-conducting material with the shape of coaxial cylindrical tubes connected at one extremity of the unit to a crown provided with an electric connection mechanism. The electric connection mechanism is connected to at least one helical winding provided on at least one of the faces of one of the three cylindrical supports.

Abstract: The present invention concerns a plasma torch with an approximately axi-symmetrical structure including a tubular bare torch portion having a single upstream electrode or a pair of coaxial upstream and downstream electrodes. The electrodes are tubular and cooled by a suitable cooling circuit. A field coil moves the arc foot. An injection mechanism injects a plasma gas downstream of the upstream electrode or between the upstream electrode and the downstream electrode. A starter mechanism ensures starting of the torch. An external structure integral with the bare torch at its proximal extremity includes fluid and electric linkings with the outside of the torch. The bare torch includes a bearer structure formed of three coaxial casings overlapping, at least partially, and integral with the external structure.

Abstract: Apparatus is provide for the fabrication of fiber composites composed of a fiber-reinforced vitreous or glass-ceramic matrix by winding fibers preimpregnated with constituents of the matrix onto a mandrel. The apparatus includes a furnace into which a winding mandrel can be introduced; elements for driving the mandrel in rotation around its axis inside the furnace; transit elements including a slot parallel to the axis of the mandrel positioned in the wall of the furnace for delivering fibers into the furnace; elements including a head for delivering fibers from supply spools positioned outside the furnace to the mandrel inside the furnace via the transit elements; and elements for actuating and controlling delivery of fibers and driving in rotation of the mandrel comprising elements for actuating and controlling the elements for driving the mandrel and the head for delivering the fibers as a function of winding parameters.

Abstract: A tool holder assembly, having a central tool holding shaft (1) provided, on the one hand, with a mounting cone for securement in a machine tool spindle and, on the other hand, on the side opposite the cone, with an intermediate cylindrical body provided at its forward portion with securement structure for a tool. It is provided also with a feeler device (2) centered on the central shaft (1) and guided in translation on this latter, with lubricating structure and with cleaning structure for the machining region at the location of application of the feeler device (2).

Abstract: The invention relates to an internal-combustion engine having opposed integral annular pistons and a central shaft. The piston block (1), formed by the two pistons (2, 3) exhibits, at each axial end, an axial double skirt fitted with an outer crown (9) forming the piston head proper, and an inner crown (10) forming an admission pump with an antechamber (30) radially within the corresponding annular cylinder (5), wherein the piston head (9) delimits a combustion chamber (12). Radial pawls (22), penetrating axial ports (21) of the housing (4) and radial holes (18) of the piston block (1), have their inner radial ends engaged in sinusoidal circumferential undulated grooves (20) made in an enlarged central part (19) of the central driving shaft (8) driven in rotation by the reciprocating axial movements of the piston block (1).