US1713438A - Method and means of relining curves in railroads - Google Patents

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y 1929- F. s. KIMBALL r I 1,713,438

METHOD AND MEANS OF RELINING CURVES IN RAILROADS Filed May 7, 1928 l/we/yfr fFeaS. Min/val?! Patented May 14, 1929.

UNITED STATES,

PATENT OFFICE.

FRED STANLEY KIMBALL, OF BIG FLATS, NEW YORK.

METHOD AND MEANS OF RETAINING CURVES IN RAILROADS.

Application filed May 7, 1928, Serial No. 275,871, and in Canada July 11, 1927.

This invention relates to improvements in a method of relining curves including spirals, complex and reversed curves, in connection with railroad systems and the like, and the objects of the invention are to provide a'simple and efficient means of relining and truing curves which can be attended to with a minimum of time, necessarily reducing the cost of maintenance. I

A further object is to provide a. comparatively quick, accurate and practical method of relining to replace the methods at present in vogue, and avoid the inaccuracy thereof.

Vith these andother objects in view, the method consists essentially of adjustment of the rails to their proper degree of curvature by'meansof the use of a line extending between two rails, anda hand rule or the like in the hands of the foreman, whereby the amount of displacement may be measured and adjustment effected successively.

The previous methods consist 1n r ev1ewing the curves and marking at each oint the amount of displacement of the rail whereby the rails are afterwards thrown into hne with the mark previously left.

In this instance with the throwing of each rail into position the further ends of the rails necessarily are displaced and thls necessarily means that the markings effected will not be accurate. In other words the markings are taken from points that require subsequent adjustment and therefore cannot be accurate, the subsequent displacement of the rails resulting in direct inaccuracy throughout.

The present method will be more fully understood with reference to the accompanying drawings which form part of the present disclosure and in which:

Fig. 1 is a diagrammatical view of a simple curve, disclosing the various positions of the line during the relining method.

Fig. 2 discloses a plan view of curved rails, the upper rail being spiralled to the point of curvature or tangency.

Referring to the drawings, and particularly to Fig. 1, 1, 2 and 3 indicate the first three rails and 4 indicates the line or cord, etc, used with the present method of relining the curve shown in each instance extending between the rail joints, the first three being indicated at 5, 6 and 7.

The present method embodies the use of line 4 of predetermined length, in this in- A, one end of the line is held at the first joint at A, and the line is stretched to the second succeeding rail joint 6, as illustrated,

in the form of a chord across a circle, and measurement of the'degree of curvature is taken along the middle ordinate of the first rail indicated at 5.

Preliminarily on thecurve each rail is rapidly inspected in this manner in order to ascertain the degree of curvature and an average is then taken to indicate the degree of the curve. In my experience I have found in preliminarily inspect-ing curves before relinement, that in practically all cases a number of the rails will be found to read approximately the same and at least it will be found that two rails will approximate exactly. In this manner the degree of ourvature can be readily ascertained.

The method is then followed, as stated, from the point of curvature or tangency in the same manner with the required degree known from the preliminary inspection. The line is stretched between the two first points A and 6 (second successive oint) and by means of a rule in the hands of the foreman, the degree of curvature is marked off along the middle ordinate of the chord, the joints being then immediately thrown into accurate position, measurement being on the middle ordinate from the line to the heel of the rail. Joint 5 is then in accurate position and the method is carried further for the adjustment of the next succeeding joint, wherein the line is taken from joint 5, stretched to and held at joint 7, and the same steps followed until joint 6 is thrown into accurate adjustment.

This is followed throughout in each succeeding joint of the curve until the curve has been relined to the proper degree. The same method is followed throughout in relining spirals, complex and reverse curves. In the relining of curves it has been my general practice to spiral such curves, which provides for more tangent track and increases efliciency. In this instance on the relinement chord, which is directly at the joint of the tion;,two linemen, one man for ascertaining of spirals, the method above explained is followed, starting at the point-of curvature or tangency, working to point of full degreeor vice versa, increasing or lessening the degree as the case maybe. The first rail joint is thrown into accurate position, the process of spiralling is then followed, each rail joint being positioned in accurate line according to gradual increase or decrease in the curve.

From the foregoing it will be seen that'I have devised a simple, practical and efficient method ofrelining curves, which when employed will go far in reducing-the cost of maintenance. Three men are all that are re quired for the work of prelim narily reviewing the curves; two linemen and one man with a hand rule for ascertaining the degree of curvature and at the most five men when relining the curve by successive operation, within the scope of the claims constructe'dwithout departing from the spirit or scope thereof, it isintended that all matter contained inthe present specification and accompanying drawings shall'be interpreted in an illustrative and not in a limiting sense.

-What I claim asmy invention is:

1. The method of relining curves and the like, which consists in preliminarily reviewing the curve by means of a line stretched between the extreme joints of two'adjoi'ning rails'repeated throughout the curve, ascertainingthe correct degree of curvature by means of 'a rule,.'with measurement along the middleordinate of the line, and averaging each successive result, repeating such operationsuccessively throughout the curve and simultaneously throwing the intermediate joints into correct position with each successive accurate degree marking.

- 2. The method of relining curves and the like, which consists in preliminarily review ing the curve, starting at the point of tangency or curvature to ascertain the correct degree ofcurvaturethereof bymeans of a'line stretched from said point to the second joint of the second successive rail, repeating said operation between the extreme oints of each two rails and ascertaining the degree of curvature by means of a hand rule placedalong the middle ordinate of the line, averaging the result to obtain the correct'degree and repeating the operation throughout the .whole curve, marking the correct degree of curvature along the middle ordinate ofeach successive joint, and simultaneously with each operation throwing, the intermediate joints into correct position wit-h' 'each successive accurate. degree marking.

In witness whereof I 'ha ve hereunto set my hand. I v I FRED STANLEY KIMBALL.

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