| 摘要 |
1,049,978. Flexible hoses. GEORGE ANGUS & CO. Ltd. Nov. 10, 1965 [Dec. 1,1964], No. 48796/84. Heading F2P. A flexible fire hose comprises a textile jacket 10 having an impermeable rubber or plastics lining 15 and an outer abrasive-resistant rubber or plastics cover 16, said cover having a plurality of sealed small holes or cuts 21 so that, on puncture 23 of the lining, high pressure fluid within the hose bore will cause local rupture 22A of the cover and not cause substantial detachment of the cover from the jacket. As shown, the holes or cuts may only extend partially through the cover or, alternatively, as illustrated in Fig. 4 (not shown), the holes may extend through the full thickness of the cover In this latter case, the holes may be sealed by various methods described with a suitable material 24 such as natural or nitrile rubber latex, polyvinyl chloride latex or emulsion, or a wax. A method of manufacturing the hose as illustrated in Figs. 1 and 2 (not shown), comprises the steps of drawing the textile, jacket through an extruding head 12, which simultaneously coats the jacket with inner and outer layers as described in Specifications 856,955 and 977,208, drawing the hose through a cooler 13, partially or fully perforating the outer layer or cover by drawing the hose between a pair of rollers 17 having axial, staggered rows of tapered pins 20, specific pin and pin-spacing dimensions being stated, and sealing the resulting holes when the cover is fully perforated. |
