Show It REPAIR OF 1 AUTOMOBILE TIRES DAMAGE CAUSED BY BYH Byl H POOR HIGHWAY CONDITIONS The sixth of a series of articles dealing with the abuses g and amI proper treatment of tires tubes and rims written exclusively for THE SUNDAY TELEGRAM by W. by-W. W. W L L. well So-well manager local branch Firestone t compa company y X 1 By WL SEWELL Fabric like ke steel or any any other article has its limit of ot strength and wh when n. n taxed beyond that that po point nt will break brdak A rupture may b be c caused used from a cut or bruise and usually although not al always always al- al ways the fabric fabri splits with the bias or direction of ot the threads A sharp stone or other cutting object will sometimes leave a mark In the rubber cover but frequently a severe severe shock fr from m blunt object will develop a a rupture and not leave any mark in the soft sott yielding rubber This injury may occur from driving with considerable sp spewed speed ed over over stones in in th the roadway dropping into deep holes in the pavement and ruts in the road When turning around inthe in inthe inthe the street some drivers carelessly back rear tires against curbstones curb It is a common practice of some some car owners to run front wheels against curb stones especially if the brakes are not in good j jorder 1 order The edge of curb stone is not alwa always s 's sharp but when driven driver against I same with much force it is sufficiently pointed to strain and cause breaks inthe in inthe inthe the fabrics of the tires The original damage to the fabric may be be slight but continued strain will cause the rupture to become larger and eventually eventual eventual- inner tube sometimes sometimes ly pinch the tube both c case se tube arid may blow blowout out It may be interesting to know that certain specifications and rigid tests tests tests' are are required of ot fabric furnished to I manufacturers of quality tires A I square inch must contain a specified number of threads in the warp lengthwIse length length- lengthwise lengthwise wise also in the filler crosswise Each thread must be twisted to specification specification specification and contain a certain number of strands The and length of the thc cotton staple in these str strands is isU U likewise con considered A square square- square inch inch of high quality tir tire building fabric has an approximate breaking strength th of of from to 10 roll 1011 of fabric is A rejected unless it if meets these various inspections inspections inspections and tests and then is found to be inv in- tW V I free freo from grease nd gi er Vii f th l hest tJ slim t rl ll l be bc shim lQ r that a break breakthrough through thi loI s vf r r plies l fE of J-of nf t fabric aa HS shown by Illustrations cannot ver very well wen be attributed to weakness in construe construe- I e Il Iii C rs Fr r s d Cf M Ab Abrasion by dirt and stones tones in making I roadway tion Breaks of this nature invariably result from a cut bruise or similar Injury in injury injury In- In jury causing the initial damage to the tire Snags and Rut Wear There may may y be times timE's when wl bad roads cannot be avoided but side wall in injury injury injury in- in jury to the tires under such circum circum- circumstances sta stances cep should not in fairn fairness ss be considered considered con con- as an Ind indication c tion of fault in the quality or construction The sides of ofa ofa ofa a tire are not intended to withstand withstands s such ch abrasion and w wear ar as is to o be ex- ex ex expected x from rubbing against cur curb curbstones stones or driving in deep stiff mud or over rutty tough rough or frozen roads Wear Near of this kind usually casually occurs on one side of at the the tire tire the side from the c car car r. r Small tires that find the lowest road level will usually receive the most damage however r inflation weight of car camber of front wheels tread widths and other things things' all have a bearing on tHe toe extent of side abrasion The side of a tire must be flexible in order to properly distribute bute the strains give resiliency minimize heat I prevent sharp bending of fabric breaking breaking breaking break break- ing and separation Therefore it is desirable that the rubber on the side sidewalls sidewalls sidewalls walls be elastic and not too dense or firm the same hard wear-resisting wear rubber as used on the tread is not suitable f for r covering the side walls The difference on materials and adaptability for tires may b be compared with automobiles and machinery parts some some materials are required to possess possess possess pos pos- sess great strength and some are se selected selected selected se- se for other qualities It is possible under very severe conditions conditions conditions con con- to wear through t the e side wall r i r rK Nw rn tA Damage done by driving in rutty unbroken unbroken unbroken un un- un- un broken or frozen roads I- I rubber in a very short time but ordinarily ordin- ordin a the wear Indicates neglect If it i is necessary to drive occasionally over over bad roads reverse the tires i. i e e. e place the worn side toward the car ear vulcan ize rubber over the most Worn parts to protect the fabric from flom moisture and disintegration and ana it tt will ber be found that the the normal Dorm l' l from the e tires will Rill Ill not be greatly affected v vr r c The next series will treat treaton on N Neglected Neg Cuts and Effects From Oil on and and Grease |