78 



THE INDIA RUBBER WORLD 



[December i, 1904. 



NEW FEATURES IN TIRE CONSTRUCTION. 



THF. RRPUBLU: RUBBER CO. S NEW TIRE. 



ANEW side wire tire which for some time has been un- 

 der severe tests, which have proved highly satisfactory, 

 will be placed upon the market soon, it is announced, 

 by the Republic Rubber Co. (Youngstown, Ohio). 

 There are some special features embodied which have never 

 heretofore been used, and which after considerable experiment- 

 ing, have developed a degree of promise very encouraging to 

 the manufacturers. 



There are no cross wires or holes in the tire itself to cut out. 

 It is all rubber. The chief point in the attachment of the tire 

 relates to the metal plates or bands passing underneath the tire, 

 and under the retaining wires at the side, thereby forming a 

 " clincher " base. 



In cushion rubber tires for vehicles, having retaining wires 

 for securing the elastic body in the rim, it has heretofore been 

 common practice to embed in or extend through the rubber 



REPUBLIC RUBBER CO.'S TIRE. SEATED IN THE CHAN 



POSITION OF THE PLATES ON THE BASE. 



metallic supports or cross wires for the retaining wires. In 

 practice it has been found difficult to construct a rubber tire 

 with the supports embedded therein, and the cost of manufac- 

 ture thereof was materially increased by the process necessarily 

 adopted in such manufacture, and on account of the care nec- 

 essary in accurately laying the supports in the rubber. In some 

 instances, the elastic body was formed of parts separately 

 formed and vulcanized together with the supports there between. 

 Tires having metallic supports or cross wires in the rubber are 

 also objectionable, because the resiliency of the tire is lessened 

 by the metallic supports, and because they are destructive to 

 the rubber when the tire is in use, and often become loose, and 

 cut and abrade the rubber, thus lessening the durability of the 

 tire. 



The present invention designs to overcome these objections 

 and to provide metallic supports for the retaining wires, which 

 are securely held in proper position with respect to the elastic 

 body, but do not extend through the rubber or body of the tire. 



so the band support need not be embedded in the rubber or 

 extend there through. 



The invention also designs to provide improved supports for 

 the retaining wires, which do not affect the resiliency of the 

 tire, and further, to provide a cushion tire embodying an im- 

 proved construction. This tire will be marketed in sizes lyi 

 inch and larger. It is the subject of United States patent No. 

 755.259, dated March 22. 1904. 



THE G & J THREAD FABRIC TIRE. 

 As a result of an exhaustive series of tests, relating to the 

 construction of automobile tires, the G & J Tire Co. (Indian- 

 apolis, Indiana) have introduced what they call their Thread 

 Fabric tire, an important feature of which is the substitution of 

 a special thread fabric for the close, square woven cloth for- 

 merly used. The term " square woven " is used to describe 

 the special weave — the feature of the cloth being that the fill 

 threads were of the same number, size, and strength as the 

 warp threads. Thus the cloth was as 

 strong one way as the other; hence 

 the term " square woven." 



The effective strength of the fabric 

 entering into the construction of a tire 

 does not depend entirely upon its ten- 

 sile strength, according to the inventor 

 of this new process, but in a large 

 degree upon the method used in con- 

 struction, which determines whether or 

 not the entire strength of the fabric has 

 been used to the best possible advan- 

 tage. This should be reckoned on the 

 NEL. basis of the work performed by each 



separate thread used in the construction of the tirg. 



In the new thread tire, the fabric is so placed and controlled 

 that each and every thread is used to the best possible advan- 

 tage ; while in a tire made of square woven cloth it may be im- 

 possible to place each separate thread in the proper position to 

 accomplish the best results, owing to the fact that the threads 

 in such fabric cross and recross each other, one over and one 

 under the other. In the 

 necessary operations in the 

 factory to prepare the 

 square woven cloth for the 

 actual making of the tire, 

 one set of threads is drawn 

 to the utmost tension, 

 while the others, or cross 

 threads, are left in their 

 normal condition. Thus 

 when a tire constructed 

 with square woven cloth is 

 inflated and the individual 

 threads are put to the 

 greatest tension, the natural tendency is for the threads to 

 form as near a straight line as possible, and in consequence 

 great pressure is exerted at the point of contact where the 

 threads cross each other. When the bias fabric changes its 

 position, as it must when the tire is in service, and sets up a 

 chafing action between the fill and cross threads, the result is 

 that the individual threads of the tire are destroyed, not by 

 pressure, but by the chafing action of one thread against the 

 other, which action is continuous while the tire is in service. 



Q 4. J TIRE SECTION. 

 Molded ill circular shape, so as to place the 

 least possible strain upon the fabric of the 

 side walls.] 



