US1127204A - Method of lining railroad-curves. - Google Patents

Description

W. T D0BYNS. METHOD OF LIN-IN-G RAILROAD CURVES.

APPLICATION FILED JULY 23, 1912.

Patented Feb. 2,1915 I 2 SHEETS-SHEET 1.

' W. T. DOBYNS.

METHOD OF LINING RAILROAD CURVES.

APPLICATION FILED 1111123, 1912.

1,127,204, v Patented Feb. 2,1915.

finesse) a specification.

methods of WILLIAM 'll. nonirns. or Bnrsron Tennessee.

j memo!) orn'mnvs narrnoen-cunvns.

M Specification of Letters Patent.

. a lication filed m 23, i912. Serial in. 711,180.

memos.

To. aZZ'w/z am it may concern Be it known a. citizen of the United States, residing at Bristol, in the county of Sullivan and State of Tennessee, have invented certain new and useful Improvements'in Methods of Lining Railroad-Curves, of which the following is y invention relates to new and improved Y laying railway tracks, and the ob provide a method for determinmgthe degree of curva-Q ing-centers to place a curve in proper ali'nement vwith the track,"this method being emlplpcyed 1n relinmg curves on an g A further object of my invention is to re vide. a method; of the above descrihedchan acter which} does not require any unusual technical knowledge on the part of the nen that are relaying the track, a tape beih, .,,tl 1'e I only instrument employed, in locating the centers and the calculation necessary being of the simplest character. I

With these and other objects in view, my invention will be more fully described,'illustrated in the accompanying drawings, and then specifically pointed out in the claims which are attached to and form apart of this application,

In the drawings Figure 1 is a plan view, showing a portion of track, the curve of which is to be relined, the first step inthe operation, namely, the marking ofi of unit tracks already I,

distances of thirty-one feet upon the outer rail, being here shown; Fig. 2 is a similar View, showing the method of obtaining the average degree of curvature, this being the second step in the operation;.Fig. 3 1s a plan view of the track, illustrating the running of the new curve, parts of the inner rail being omitted for the is a plan view, show ng the new center lme of the curveand also illustrating the manner by which this center linemay be moved iii-bodily when it is found to lie outside of whereit should; Fig. 5 is a plan view, show ing the track lined in.

Corresponding and like parts are referred to in the following description and indicated all views of the that I, WILLIAM T. Downs;

' original curve being portion of sake of c'learness; Fig. l I

reference characters.

, In order to insurea clear understanding or the method,I have illustrated in the va- .ldOUS figures a curved section of track, the

best shown in Fig. ,1. the numeral 15 desig- In all of these figures, nates the outer rail'of, the track, while the designates the inner rail.

hod consists cessive steps or operations, the first ofwhich is the dividing or marking 0d of the curve the outer o of thirtyrone feet, the point being indicated in th numerals 1 to 'lQincl sive. In dividing ofi the curve in thismanner,

so marked off clu ed The next step consists in thedetermining of the average degree. of curvature of the points land 3 and the distance between the I point 2 and the central portion of the cord is measured, this eing continued for all points marked ofl.

The length in inches of the ordinate ineasured, when the curve is divided into distances of thirty-one, feet, is equal to the degree of curvature in degrees and minutes. For instance, if the distance measured between the point 2 and the .center of the cord is five and a-half inches, then the curve is a five degree thirty minute curve. In this 1 point marked manner, the curvature at each off is found and the average curvature of the entire curve is obtained by adding the length of the ordinates I sum by the numberof ordinates measured.

The next step consists in the running of a trial curve with the average degree of'curvature so found. Two: stakes 'ornails l8 and 19' are. set midway between the inner of a number of Sucrail intounit distances e various views-by the i no part of the, easement at either end of the curve is measured. and dividing the and 7 Patented Fish. 2, i935.

drawingsthe same i I psitmningof s as;

i K518 and the employed is substantially a third stakeor visionalfl point statio increased'and a new of curvature but to lie for its about the same distance,

In this me": 25- PH "move'station 19 in the curve as run 1n app railsofithe track,

rveand in radial 'alinement. with ad aoints marked on on 3. A cord-is: now. stretched from-the emgga m arai from the stake 19'a1idthecord -swung' to the end of the ordinateso n 'as his determining the direction r 9"! the-nerd.

"For instance, if the average degree} of curvature is i degrees- -forty .-five minutes, thefordinate set off-is four and three quarter nail.20 is driven or the v-cordjiwhen so positioned, being-ilocated-substantially opposite the di givingzt H e" oints in the center line of the new., curve 7 he cord isthen stretched from the; stake 1 and the ordinate measured from thejstake 20 and another stake dIiVBn'OPP'OSLtG thepoint 7 of the outer rail as-shown at 21.

the line/of the i or, points on curveare obtained opposite all the points of division -of-the outer rail until the easernent'is reaehedl Thiscenter line of the new curve should fall about one foot, two inches inside ofthe centerline of the tangent, as

shown at 22 ,in order that an rasement'may 1 the line is found to fall cor-j the track maybe then lined in, in a 'be 'ha'd. It r i 'ya manner wh ich will be hereinafter described.

If however, it does not fall at about the right where it does fall point, the distance from to; the

med and then divided by the number of point where it should fall is measpoints s counting stake 19 as one, 20 as two='etc.,, The result thus obtained-will be the distance which it will be necessary to order to throw the curve right hen it is to be run again. Of course {i 19 must he moved -'nwardly or out ward y according to the direction in which it is/ desired to throw the curve.

I t'may be necessary to move station 19 or station 18," or both, more to insure the proper curve at both ends. If

' ears to be too fiat, the length of the ordinate usedis slightly curve run. f on the other hand, the curve is not'fiat enough, the length of the ordinateusedis slightly decreased and a new curve run in. f the be of the right degree entire length either outside or inside of where it should, then the curve may be moved bodily in the desired direc- .tion by moving each center stake the full amount which it is desired to 'move the curve: and then running a newcurve. This latter step is illustrated 'in Fig. 4, in which the stations 18 and 19 are moved into the curve run in seems to near the middle of I the outer rail, the" (these stakes beingxshown in average ordinate found inches. The length of the cord sixty-two feet and i at the 'end' work can readily this stake marked G'and with 18and 19 is claimed as new is:

than once in order position shown at 18 and"19'-;'- After the curve;has,'been' correctly run in both directions fromfthe-center,

shownin fulllines in Fig; 5.

. *As will be apparent fromthe foregoing being" of the [most elementary sortfland so old curves, all measurements and computations required the trackis lined in, ;in, the manner shown "in'Fig." .5, 'the center curve of thetrack as so lined in passing through he'pint's "18, 19, 20, etc.,; and the railsf be ng. properly gaged from this line, as

simple that any. foreman in charge of the without the assistance of an engineer or other technically trained man. p

"Having thus described the invention, what line out. the proper curvev 1'. The method of determining the degree of railroad curves andfor placing centers to put railroad curves, in proper alinement which consists in dividing the vouter rail of the track into distances of thirty-one feet, measuring the ordinate between each point so'la'id off and the chord between adjacent points on either side'- of the first, averaging the ordinates so obtained to get the average" degree of 1 curvature, fixing points opposite central points'of curvature and in the middle of the track, running chords from these points with the average middle ordinate, from the center I to the center line of the tangent of original curve and then changing oneor both of the center points lar curves to obtain a curve in which this distance is one-half the gage of the track.

2. The method of determining the degree of railroad curves and for placing centers to put railroad curves in proper alinement, which consists in determining the curvature of the track at spaced intervals, averaging these curvatures to determine the average degree of curvature, fixing points in the middle of the track of the curve and spaced thirty-one feet from e-achother, running a substantially sixtyline, of the curve so obtained the ordinate as the measuring. the distance lot and runmng siml- I at the central portion two foot chord from one of these points, its

middle ordinate being measured from the other of said points and being as many,-

inches asthe averagecurvatureis degrees, the free end of this chord locatin a third point, running a second sub'stantia ly sixtytwo foot chord from the second point to the average the average curvature from 0 points as a middle ordinate, chord from the of the ordinate to .point thus locatinge third oint,

this operation with the points, etc. to

rst

other point through the end a point as far beyond the 5. ordinate as the ordinate is beyond the easement .of the curve and ter line .of the new curve running a through the points so located.

In testimonty m presence 0 whereof I aifix my two witnesses.

signature the other WILLIAM T. DOBYNS. [L 5. repeating Witnesses and third PAUL F. SALe,'

T. W. Sum

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