Rubber Hose: Braided, Spirally Wrapped and Vulcanized in Long Lengths

Henry Cobb's wrapped hose (Revere Rubber, US 1,230,867, 1917). A rubber tube is forced through a ring die, braided over while held open by pressure, wrapped by machine with a helical strip of frictioned fabric overlapping half its width, covered in rubber and vulcanized. Wrapping by machine instead of rolling bias-cut fabric by hand lets the hose run 500 ft or more, and Cobb says it stands nearly twice the bursting pressure. The patent gives no sizes, recipes or cure times. Couplings are not part of it: an air hose is this hose with couplings fitted. The picture: the patent's sheet 1.