A flexible strip of elastomeric material, or a fabric strip which is coated with or contains an elastomeric material is wound helically with overlapped edges. A form-giving member of stiff bendable thermoplastic material in rod-like form is laid between the overlapped edges and secured there by self adhesion of the overlapped edges. Then the tubing is heat-treated to heat-set the form-giving helix in its helical form and at the same time cure the strip and to weld the overlapped edges of the strip. The flexible strip is preferably impervious to the passage of gas through it.
The invention relates to a flexible hose formed of a wound web material and having its walls reinforced by wire windings, with the edges of successive web windings overlapping one another. In accordance with the invention, the longitudinal axes (Da) of the wires (13, 13', 13") and the longitudinal axis (ba) of the web material (3) extend at equal inclination with respect to the hose axis (A), and the reinforcement consists of at least two wire windings.
An easily contracted elastic flexible hose comprises thin tubing and spiral reinforcement means. The thin tubing is tapered in its thickness in the longitudinal direction between two adjacent spiral turns of the reinforcement means so that the tubing may bend inwardly and form pleats, which pleats incline toward the axis of the hose and advance along the inner surface of the reinforcement means in its contracted form.
A pipe for carrying gaseous fluid, more particularly in motor vehicles, and particularly for the admission of air for combustion to the engine or for ventilation of the vehicle interior, including an outer layer (1) of a fluid-tight flexible material and a non-woven fibrous inner layer (2) secured to the outer layer (1).
Light and rigid fiber glass reinforced plastic composite pipe consisting of an inner tube formed by winding glass fiber threads impregnated with a thermosetting resin on a mandrel by a filament winding process, a rib wound around the inner tube spirally at an appropriate pitch, said rib being produced by mixing an unsaturated polyester resin, magnesium oxide, a cross-linking agent, a filler and a diluting agent and simultaneously thickening the mixture at a temperature of 20.degree.-60.degree.C, and an outer layer covering the inner tube and the rib, which is composed of glass fiber threads impregnated with a thermosetting resin.
A flexible hose having a sufficient strength while ensuring the air permeability is provided. In a hose formed by winding a soft resin tape helically such that leading tape end brim portions and trailing end brim portions extending in the hose longitudinal direction are overlapped to each other in the hose radial direction, gaps for ventilation for making the inside of the hose and the outside communicate with each other is formed by interposing a gap forming member having a concavo-convex shape between both end brim portions or forming a concavo-convex shape on one of surfaces of the end brim portions which face each other in an opposed manner.
