DELIVERY-AND-SUCTION HOSE AND METHOD OF ITS MANUFACTURE Russian patent published in 1999 - IPC

FIELD: delivery and suction of gases and liquids. SUBSTANCE: skeleton of hose has inner layer including longitudinal threads located at angle relative to generatrix, outer layer of skeleton including longitudinal threads located at similar angle relative to generatrix and circumferential threads at pitch not exceeding two pitches of spiral made from wire and located between layers of skeleton. Direction of coiling of threads of all layers is opposite to direction of spiral. Longitudinal threads of hose skeleton are fed directly under flow of circumferential threads of skeleton. EFFECT: reduced usage of material; increased service life of hose. 4 cl, 5 dwg