US1654397A - Balanced splice bar for running rails - Google Patents

Description

I V. C. ARMSTRONG BALANCED SPLICED BARFOR Romaine RAILS Filed July 5, 1927 2 Sheets-Sheet 1 6 m my 6 WW 3% 5M 3M .MS HQAWQVWS A 4 a 51 a, w a1 4 a z gnwntoz Victor C'Jrm-sirow, I

' Patented Dec. 27, 1927.

[UNITED STATES- *PAr Nr oFFicE.

VICTOR C. ARMSTRONG, OF HACKENSACK, NEW JERSEY, ASSIGNOR TO THE RAIL JOINT COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK.

BALANCED SPLICE BAR FOR RUNNING RAILS,

Application filed July 5,

This invention relates to the subject of.

theusual standard requirements, but whichalso have no spike slots or spike notches therein, thereby permitting the joint freely to run with the rail without interference from the spikes and without shearing strains on the latter. To meet all of these requirements is the problem met by the present in- Wit theseand other objects in view which outer edge of the rail base flange. Such alvention, and the problem involves an unusual distribution of metal in the bar to compensate for the reduction in the elastic, limit of the bar which occurs when any truncation is made in-the foot flange or toe thereof in which the'spike slots or notches are usually adapted for a smaller size and weight of located.-

v Accordingly, the present invention pro vides a splice bar having no projecting part beyond the outer edge of the rail flange, while at the same time having a deep and substantial spike head bearing surface, permitting spiking to the ties without restraining the rail joint from-movement with the rail when itfruns. At the same time the present invention involves a special distribution: of metal in the lower half of the bar which is so relatedtothe distribution of metal in the upperhalf of the bar as to substantially balance the upper and lowerhalves of the bar, particularly as to the static moment and as to the gratios. Thus, the present invention provides a practical form of bar for free running rail and at the same time, improving the ratios of metal distribution in such a way as to counter-act and compensate for the weakness which would otherwise result from makin a. bar of this kind.

1927. Serial No. 203,511.

will'readily appear to those familiar with the art the invention consists'in the novel structural shape of splice bar with the improved met-alratios herein illustrated, described and claimed; and while the invention is necessarily susceptible of structural modification without departing from the spirit and scope thereof, certain practical embodiments are shown in the drawings. by way of example. In these drawings Figure 1 is a sectional view of a complete I rail joint for running rail, showing the improved balanced splice bars and the relation of the track spikes thereto.

. Figure 2 is a'half-view of arail joint showing'in full lines the improved splice bar su-' nerposed over a conventional form of splice bar having the usual spiking flange or toe and adapted for the same size and weight of rail; this conventional splice bar being shown in dotted lines thereby to illustrate graphically the radical metal distribution required to brin shave.

Figure 3 is a'view similar to Fig. 1 showing the improvement incorporated in a bar rail than that shown in Fig. 1, thereby illustrating the general range of equivalents;

g about the new'structural vided with the usual outstanding foot flange or. toe 1 which for some railroads is required to be punched ,or slotted to provide spike openings through which the track spikes are driven. This conventional angle'form of splice bar'is well designed and has: a satis- I factory metal distribution therein, but it is" not a apted for free running rails where track spikes are desired at the joint locations.

That would be the fact even though the con-" ventional splice bar S of Fig; 2 had its foot flange f sheared ofi on the shear linefindicated by a to bring the flange within the teration of the conventional splice bar S would greatly impair its metal distribution besides greatly reducing the elastic limit of the bar, rendering it undesirable for the special purpose referred to. Meeting the problem above described the present invention as shown in Fig. 2 of the drawings provides a structural shape for a splice bar including its substantially vertical web portionl, an enlarged laterally widened head portion '2 and an enlarged laterally widened foot portion 3. The metal in the web 1 of the bar is so distributed and located as to be substantially bisected by the vertical plane of the outerside of therail'head,

thus providing a form of splice bar in which the opposite bars of the joint havev a much less out-to-out than the out-to-out of joint bars of the conventional type S indicated in Fig. 2. In other words this construction materially lessens the distance between the outer vertical bolting face 4 of the bar web and the web of the rail and makes it possible to form the enlarged widened foot portion 3 of theimproved splice bar with a spiking 'toe 5 overlying the upperside of the rail flange and having its outermost portion or edge 6 lying entirely inside of the outer edge of the rail base flange. At the same time this spiking toe 5 is formed at its upperside with a deep spike head engaging surface that conforms to and is adapted to be engaged by the underside of the head 8 of the usual track spike 9.

- In connection with the spike toe formation 5 of the improved spike bar it will be observed that the said spiking toe is very materially thickened vertically in conjunction with the inner enlarged heel projection 10 of the foot portion 3. This heel pro jection 10 is specially formed in conjunction with the vertically thickened spiking toe 5 to bring about an improved metal ratio distribution. To that end the said heel projection 10 intended to extend inwardly substantially beyond the vertical plane of the inner edge of'the lower fishing surface, that is to say its surface extends inwardly and upwardly, as indicated by the line 11 to a point a where it joins-the downwardly and inwardly sloping face 12 of the bar web to form an inner heel projection which is at leastas great in vertical thickness as (the spiking toe 5 as shown in Fig. 3 and pref- 4 erably of greater vertical thickness than the vertical thickness of the spiking toe 5 as shown in Fig. 1.

By reason of this special formation of the lower part or foot portion of the'splice bar the reduction in the elastic limit of the bar due to cutting off the outstanding foot flange I thereof is counteracted and compensated for by substantially balancing the ratios of metal in the upper -and lower halves of the bar respective y above and below a middle line or axis,.which in the bar shown in Fig.1 happens to bethe horizontal neutral axis thereof. That is particularly true of the balancing of the static moments respectively in the upper and lower portions of the bar above and below the said middle line or axis ratios, which results in having and also a substantial balancing of the and the A the center lines of stress and the centers of gravity of the said upper and lower portions of the bar respectively at substantially the same distances above and below the said middle line or axis. In further explanation of this phase of the invention it is here noted that the static moment (S) of a particular area is the product of that area -multiplied by the distance from an assumed axis of rotation to its neutral axis parallel to the assumed axis of rotation. This'physical property of a bar bears an important relation both to the moment of inertia (I) and to the area (A) in any distribution of metal in the bar. Accordingly, the present invention utilizes the desirable feature of having the ratio of metal distribution in the upper unsymmetrical part of the bar substantially equivalent to the metal distribution in the lower unsymmetrical part of the bar. This results in locating the center line of gravity for the upper part of the bar substantiallyat the same distance from the horizontal axis or middle line of the bar as the center line of gravity for thelower part of the bar is disposed below said axis or middle line. In other words, the centers of gravity may be properly disposed b a proper static arearatio obtained by dividing the static moment (S) of the section by, its

area (A). The inertia static obtainedby dividing the moment of inertia of the section by its static moment/relates to a ratio of metal distribution which provides for properly disposing the center lines of stress in the bar respectively above and. below its neutral axis or middle.

From the foregoing it is thought that the a V provided -foot portion having a a adapted to lie entirely within the outer edge ing toe adapted to lie entirely within the outer ed e of the rail flange, the said widened oot portion Having a proportional distribution of metal therein, with relation to the metal distribution of the upperunsymmetrical ortion of the bar thereby to provide a su tantial equivalence between the ratios of metal distribution for the upper and lower unsymmetrical portions oi the bar.

2. An unsymmetrical splice bar section with an enlarged laterally widened thickened spiking toe of the rail base flangeand with an inner enlarged heel projection having a. vertical thickness at least magi-ill to the vertical thickness of the said sp g toe. v

3. A balanced unsymmetrical splice bar for running rails having a substantial equivalence between the static moments of the upper and lower unsymmetrical portions thereof and provided with an enlarged laterrlly widened foot ortion provided with a vertical thickene spiking toe adapted to lie entirely inside of the outer edge of the 'rail base flange and with an inner enlarged heel rejection having a vertical thickness of-at east the same as the vertical thicknessof the said spiking toe.

In testimony whereof I hereunto. afli'x my signature.

. VICTOR C. ABMSTBQNGI

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