A flexible, very high pressure hose as a flexible conducting member in hydraulic systems. The wall of the hose contains filamentary load-carrying cords which are embedded in two or more layers. The load-carrying cords are combined to form a plurality of strips which cross one another or are braided with one another. The present invention deviates from the heretofore known symmetrical arrangement where the strips of a given layer have the same number of load-carrying cords in both directions, and instead provides an asymmetrical layer construction including strips which in one direction have a different number of load-carrying cords than do the strips which extend in the opposite direction. While the local resistance to pressure remains the same, the advantages of the present invention are distinct improvements, primarily in the flexibility and the service life of the novel hoses.

The invention discloses a hose (10) which comprises at least one tubular layer (3) of plastic or rubber material, a mesh-network (4) of the chain type presenting mesh lines (5) and mesh rows (6) having a tubular shape being wound on the external surface of said inner layer, a possible external layer (7), and is characterized in that said mesh rows are slanted in relation to the longitudinal axis of the hose. According to a preferred embodiment the lines (5) of said meshes are slanted in relation to the longitudinal axis Y of the hose, following a direction opposite to the direction of the mesh rows (6).

A multilayer pipe is comprised of an internal tubular ply made from a synthetic material, a strengthening reinforcement member also made from a synthetic material and an external ply made from a synthetic material. At least one of the plies is bonded, by melting, to the reinforcement member. The strengthening reinforcement member has, over the whole or part of its length, a reticulate lacunary structure, of which only internal and external faces thereof are bonded to corresponding adjacent plies. Spaces of the lacunary structure are blocked off by, but not filled by, these plies.

A hose for transport of fluid such as oil for a cooling system of an engine oil cooler, a torque converter oil cooler, etc. and oil for an oil lubrication system of a vacuum pump that are used in automobiles, aircraft, etc., and the hose comprises an inner tube of acrylic rubber; a reinforcement ply including lower yarns spirally wound on the outside surface of aforesaid inner tube such that the size of mesh will be 0.5 mm or more, and upper yarns spirally wound on said lower yarns and an outer tube of acrylic rubber laminated over the outside surface of aforesaid inner tube through said reinforcement ply, aforesaid inner tube and aforesaid outer tube being directly bonded by vulcanization through the meshes of said reinforcement ply.

The invention is directed to a hot water resistant pressure hose (1) comprised of an inner tubing (2) made of an elastomer safe for use with food, preferably silicone, whose outer surface (3) has wound around it a plurality of multifilament polyester yarns (7, 8) forming a braid structure (4). This results in a braiding (4) having meshes (6) for establishing a positive-engagement bond between the inner tubing (2) and an outer tubing (9) made of an elastomer, preferably silicone, that is applied to the braiding (4). The outside diameter D of the inner tubing (2) is smaller than or equal to 6 mm, preferably 4.7 mm. For each winding direction, 10 to 15, preferably 12 polyester yarns (7, 8) are used, with the polyester yarns (7, 8) having a diameter that results at a weight of 250 den, minimum, and 310 den, maximum, preferably 280 den. Further, each mesh (6) is to cover an area of between 0.25 mm.sup.2 and 2.25 mm.sup.2, preferably 1 mm.sup.2. A pressure hose (1) is obtained which is hot water resistant (95.degree. C.), pressure resistant up to about 35 bar, inodorous, tasteless, and recyclable.