New Form Of Inner Tube Developed In U.S.A.

Poverty Bay Herald, Volume LXIII, Issue 19070, 18 July 1936, Page 9

New Form Of Inner Tube Developed In U.S.A.

DESPITE the very steal improve U men I in I vies which ha* taken place over the past few years, and which has made lyre trouble of any snri a rant v,» provided il.ni ihe easing: are in goo"' 1 condition, with good, thick treads, Ihe portability of ■> blowout when travelling I'a '1 C ■'* spectre which haunts even drivei ai \arions times in his motoring career. The natural fear of such a happening is made more acute because very few motorists know by personal experience what happens when a lyre blows out at speed, and because of this ignorance, few drivers can say with any <ertaintv that tl.ey would keep I lieu heads, .and do the righl thing '" keep the car ou the road. To prevent calamitous results from a lyre blow-out, American tyre manufacturers are now marketing in the U.S.A. a new form of inner lube which is simple and ingenious, and which seems to oll'er complete prelection. Really a Dotfble Tube ll really is a double lube, an inner and an outer one. and the two are joined together at their inner peripheries, iho inflating valve allowing air to be pumped into I lie inside lube. This tube in turn communicates with the outer tube by means of a small hole, so that when the tube is being inflated some of the air passes into I Inouter tube until the pressure in both is balanced. Inflation of tyres equipped with this new tube, of course, is a rather longer process than tyre inflation is at present. However, should the casing and the outer tube blow out when travelling along the road, the inside tube remains unaffected, because there is no strain on it; tho weight of the emwill be transferred to it. and it \. ill keep its inflated stale for a snlH.-io.it length of time, owing to the smalliu-vs of the hole communicating with 'lho enter tube, to enable the car to be brought to a standstill in safety. Because the gap'hotwoon -the inside lube n.id the outer tube is very small, when a biow-cul occurs, the wheel will not drop more than an inch ai the most, instead of the four or livo inches which would occur with a modern super balloon tyre equipped with an ordinary tube, so that with a w.,\ sudden change in the car', direc-t.iou, the present danger of blow-outs,-docs not occur, and t'Jie ear remains as o e pletely under control as though nothing untoward had happened.