FLEXIBLE HOSE Russian patent published in 1994 - IPC

FIELD: manufacture of hoses withstanding vacuum, excessive hydraulic pressure and excessive bending. SUBSTANCE: spiral framework is coated with layer of flexible material. Textile gaskets are located under and above spiral. Gaskets are made of strips with unidirectional load-bearing threads located in straight sections and laid under spiral at angle of 45 deg and above spiral at angle of α₁<α₂≅ 90^° 90 deg relative to geometric axis of hose. Family of load-bearing threads of strips form hyperboloid of revolution with diameter of throat of surface equal to diameter of cylinder formed by strips located under spiral. Load-bearing threads are laid above spiral and form bent sections with bends at points of contact with surface formed by strip laid under spiral. Bend is directed towards surface formed by strip laid under spiral. EFFECT: enhanced reliability. 2 cl, 5 dwg