142 



THE INDIA RUBBER WORLD 



[December 1, 1913. 



A CUSHION TIRE FOR MOTOR TRUCKS. 



AFTER considerable experimenting on the part of the manu- 

 facturers, a solid rubber cushion truck tire has been pro- 

 duced with the intention of meeting the adverse conditions 

 under which motor trucks are operated. This same type of tire 

 has been used on electric pleasure cars for several years past, and 



The New Motz Cushion Tire kor Trucks. 



its adoption for truck use is expected to partiiilly reheve the detri- 

 mental effects caused by the shock vibrations resuhing from solid- 

 tire equipment. In design, this type follows closely the construc- 

 tion of the pleasure car type, being constructed with under-cut 

 sides which form slanting bridge. Each tire has a dual tread with 

 a single base, and two tires inay be mounted on a single wheel as 

 sliown in the cut. Extending on the inner side of each tread at 

 regular intervals are perpendicular indentations to prevent skid- 

 ding. This non-skid feature, it is claimed, will remain effective 

 until the tire yields its guarantee mileage, which is for 10,000 

 miles, or for one year. |Motz Tire & Rubber Co., Akron, Ohio.] 



PUNCTURE-PROOF PNEUMATIC TIRE. 



A lire embodying the ordinary inner tube feature of the usual 

 type and yet laying claim to being absolutely puncture proof. 

 has been recently placed on the market. In the illustration, A 



represents the flexible 

 rubber tread which is 

 made all in one piece. 

 B is an ordinary inner 

 tube as used in most 

 pneumatic tires. The 

 outer tread A sur- 

 rounds the inner tube B 

 and both are held in 

 place by the steel rims 

 C C. These rims are 

 maile from vanadium 

 steel and arc attach.'d 

 lo the felloe of the 

 wheel by a quick-de- 

 mountable device. They 

 arc held together by 

 bolts D which pass 

 through steel lined 

 openings or slots E in 

 the tread. These open- 

 ings arc made wider 

 than the bolts, as 

 shown, in order to al- 

 low for the radial 

 movement of the tire as it strikes obstructions in the road. 

 Shoulders F f are provided on the tread, against wdiich the 

 steel rims set, thus preventing the air pressure from forcing the 

 tread outwardly beyond a certain point. This feature makes it 

 impossible to throw the tire off the rim. (Detroit Pneumatic 

 Tire Co., Detroit, Michigan.] 



Pcncture-Proof Fneum.vtic Tire. 



RUBBER TIRE WITH RESILIENT STEEL TREAD. 



Few, if any, rubber tires have been designed that have taken 

 the place of the pneumatic in all respects, for, with all its inher- 

 ent faults, it still has obvious advantages. One of its defects 



is the rapid wearing out of the 

 tread, thus exposing the fabric 

 and making the inner tube sub- 

 ject to blow-outs. Many treads 

 of various compositions have 

 been devised for protecting the 

 lire, but the drawing herewith 

 shows a tire with an entirely 

 new kind of tread. This tire, 

 which is known as the "Stelas- 

 tic," has a tread of a composite 

 nature, combining numerous 

 small steel springs with the rub- 

 Pneumatic Tire with RESiLi-i^^r of the tread. The steel 

 ENT Steel Tre.\d. spirals are vulcanized in a ver- 



tical position and are placed so close together that they form a 

 protection against wear as well as against punctures and side-slip. 

 It is reported that in a recent test of a set of these tires by the 

 Royal Automobile Club of London, 20,000 miles was covered 

 without a cut, puncture, or blow-out. [Hunts, Limited. 117 Long 

 Acre, London, W. C] 



A NON-SKID TRIPLE SOLID RUBBER TIRE. 



The ordinary solid rubber truck tire is usually of such homo- 

 geneous and solid construction that it lacks sufficient resili- 

 ency to relieve the machine of the heavier road shocks. Fire en- 

 gines, for instance, must travel 

 at high speed, regardless of the 

 condition of the road, whether it 

 be rough or smooth and slippery. 

 The truck tire illustrated shows 

 a new triple solid rubber band tire, 

 which is said to add much to the 

 resiliency and to provide safety 

 against skidding. 



The two outer tires are of the 

 usual solid gray rubber, while the 

 center tire is a special soft and 

 resilient red rubber and of a 

 slightly larger diameter so that it 

 stands up above the others. This 

 combination of hard and soft rub- 

 ber is said to give a resiliency 

 hitherto unattained by the solid 

 rubber band tire, and to secure a 

 perfect grip on the road surface. 

 These tires, which are made un- 

 der the Coleman patent, have 

 been adopted by the London fire 

 brigade. [Charles Macintosh & 

 The Macintosh Triple Tirk. Co., Manchester, England.] 



DOMINION ■■NOBBY" TIRES. 



The manufacture of Dominion "Nobby" tires has just been 

 begun in the new factory of the Dominion Tire Co., Limited, 

 situated at lierlin, Ontario, a very complete description of which, 

 with illustration, was given in The Inih.v Rubber World of Feb- 

 ruary last, when building operations began. Some idea of its 

 size may be obtained from the fact that more than 800 tons of 

 reinforced steel have been used in its construction, and approxi- 

 mately 40,000 feet of steel sash have gone into the windows. 

 This new jilant represents in its construction and equipment the 

 combined and accumulated experience and knowledge of some 

 of the largest rubber factories in the United States. The 

 Dominion people express themselves with great confidence that 

 this is "the finest tire factory in the world." 



