Abstract: This section element has a cross-sectional shape with reentrant or inside angles and/or concave parts or a hollow polygonal or other shape. A plurality of parallel threads are held taut and maintained in the longitudinal direction of the section element in a configuration which corresponds to the cross-sectional shape of the desired section element. These longitudinal threads are progressively displaced continuously in front of a group of knitting heads knitting in two dimensions which are orthogonal and perpendicular to said longitudinal threads. Each knitting head comprises a plurality of series of needles I, L1, L2, LA, A1 and A1' each of which covers a specific portion of the cross section of the section element.

Abstract: The machine is of the type comprising rods defining the volume of the section element and extending in the longitudinal direction of the latter and a knitting head depositing threads around the rods in a direction perpendicular to the latter. The rods are thin hollow rods (12). A die (9) maintains the hollow rods in a fixed position parallel to each other in a configuration which corresponds to the cross-sectional shape of the desired section element. Feed devices (7, 8) feed the longitudinal threads of the section element through the hollow rods (12). A device (15) is provided for retaining one end (12a) of the threads issuing from the rods in an identical configuration. Two knitting heads (16, 17) of known type deposit threads in two planes which are orthogonal and perpendicular to the rods (12) in the vicinity of the ends of the latter. Devices (15, 5) are provided for continuously displacing the threads issuing from the rods as the threads are deposited by the knitting heads.

Abstract: A three-dimensional weave is formed having a triple set of rods and yarns. The network of rods is placed about the generatrices of the body of revolution to be made and ordered regularly around the axis of the latter in coaxial layers of revolution and in successive radial bunches. Circumferential yarns and radial yarns are laid in helical courses and woven into said network of rods around the axis.

Abstract: The invention relates to woven hollow structures.Its object is to provide a method and a machine making it possible to obtain hollow reinforcements of revolution by three-dimensional weaving using rods 11, circumferential yarns 12 and radial yarns 13. In the network of rods 11 made to rotate around the axis 16 are introduced and woven the yarns 12 and 13, the latter being knitted by a needle 28 in the form of a chain stitch, and the helical layers of yarns thus formed, resting on a plate 20 to which is imparted a progressive downward movement, slide along the rods 11 and are tamped by fingers 30 over which is mounted a pressure plate 38.Application to the fabrication of woven reinforcements of complex shape for hollow bodies of revolution in plastic material.