Pneumatic Tires for Business Cars.
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A " Non-nipping " Puncture-resisting Tube.
Although solid rubber tires are almost exclusively fitted in the heavier types of commercial motors, the traveller's irougham and the cab are two types of business vehicle vhich are almost always fitted with pneumatic tires, and in nany cases light delivery vans, and the front wheelsof the wavier vehicles could with advantage, and particularly vhere fragile goods have to be carried, be shod with airilled tires. The difficulty, of course, with this type of tire, s that the inevitable punctures which occur from time to ime necessitate in almost every case a long and expensive lelay, a delay which of course does not matter so much to he pleasure motorist, but, when it interferes with the rapid lelivery of goods, becomes a serious item in the economy if motor delivery.
Devices calculated to minimise the risks from punctures lave, from-time to time, been put forward, and, in this confection a representative of " THE COMMERCIAL MOTOR " ibtained a few details from Mr. J. M. MacLulich, the nanaging director of The Sirdar Rubber Company, .of 34, Baker Street, W., of the new "non-nip. inner tube which he has invented.
The idea of Making such a tube struck him when reading, n the catalogues of the best-known makers, that upwards )f so per cent, of pneumatic tire troubles were due to the tipping of the tubes, when they were being fitted into place. Phis was a serious condition of affairs, he considered, and me that ought to be remedied. The results of his experinents are embodied in the "non-nipping "air tube.
The illustration which accompanies these lines shows the iosition which the inner tube takes in the outer cover when:ver it is deflated; this position is due to the fact that the ube is vulcanised in a " n" shape. No air is put into the ube until both sides of the cover are in position and the ecuritybolts are fitted : it is exactly like fitting a cover vithout a tube at all ; one can easily realise, therefore, the ime and trouble saved in replacing a tire on a wheel. One of the principal claims for this type of tire is that, hould a very serious puncture occur, .and deflation of the ube take place, as the tube springs up into the crown of the over, it is still possible to run the vehicle along without otally destroying the tube. The tube is made larger than he cover, and, when it is inflated, it is under compression ;
t is because of this condition of the rubber that, if a nail or .ny sharp instrument pierces the tube, the rubber is pressed Lp closely round that instrument, and the vehicle can be driven home without the tires becoming deflated until the foreign body is removed. This claim regarding non-deflation of the tire in the case of the intrusion of small, sharp instruments, has, we believe, been borne out in actual working.
Although this tube is more costly to make, the company offers it at the price at which the ordinary pneumatic tube is sold, and the rubber used in the manufacture is exclusively fine Pam. Twenty per cent. cash discount is given to users, and a still further discount to the trade, so that the latter doo not suffer by the private cash discount.
p interesting prize scheme has been prepared by the company; it consists of an Offer of six prizes of tires to those users of Royal Sirdar pneumatic tires who take the best care of them and give the best written accounts of their use. The first prize consists of a complete set of four tires.
Our readers will be aware that, in addition to the business done in pneumatic tires, a speciality is made by the Sirdar Rubber Company of solid tires for buses and vans.