US2139434A - Railway truck - Google Patents

Description

Dec 6, 1938 D. s BARRows 2,139,434

RAILWAY TRUCK Filed Sept. 20, 1935 3 Sheets-Sheet 1 Dec. 6, 1938. D. s. BARRows 2,139,434

RAILWAY TRUCK Filed Sept. 20, 1955 5 Sheets-Sheet 2 Dec. 6, 193s. D, s BARROWS .2,139,434v

RAILWAY TRUCK Filed sept. 2o, 1935 s' sheets-sheet s Patented Dec. 6, 1938 UNITED STATES RAILWAY 'TRUCK Donald S. Barrows, Roche-ster, N. Y., assignor to The Symington-Gould Corporation, Rochester,

N. Y., a corporation of Maryland Application September 20, 1935, Serial No. 41,489

31 Claims.

This application is a continuation in part of my application Serial No. 402,203, filed October 24, 1929. This invention relates to railwayitrucks and 6 more particularly to the construction of the side frames, spring nests and spring plates thereof.

The principal object of my invention, generally considered, is the improvement in trucks and particularly the. construction of the side frames, spring nests, sp-ring plates and spring planks (if used), whereby increased strength of -the frame and increased capacity of the bolster 16 springs are secured, provision being made at the of bolster springs with respect lto the associated frames while said nests are assembled as units between associated plates.

Another object of my invention is to provide a railway truck of relativelyV short wheel base such as, for example, a wheel base in the neighborhood of iive feet, using bolster spring groups of modiiied H shape to obtain increased spring capacity while avoiding interference between the springs and the associated brake rigging.

A further object of my invention is to provide a railway truck of reduced wheel basewith the parts so constructed that interference between the inside hung brake beams and the inner spring support is avoided by decreasing-the longitudinal dimension of the inner line of springs, this being accomplished b-y omitting `a spring from said inner line and lpositioning it inwardlyof said line preferably on the center line of thev associatedspri'ng plank.

A still further object of my invention is thel Referring to the drawings illustrating my invention, the scope whereof is defined by the appended claims:

Figure 1 is a fragmentary side elevation of a, truck embodying my invention, portions of the bolster and spring plank being shown in vertical section.

Figure 2 is a fragmentary horizontal sectional same time for the assembly and removal of nests view of the truck on the line 2-2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a central transverse fragmentary sectional view of the truck shown in Figure 1.

Figure 4 is a horizontal sectional view on the line 4 4 of Figure 3, looking in the direction of the arrows. A Figure 5 is a -fragmentary vertical sectional view on the line 5--5 of Figure 2, looking in the direction of the arrows.

Figures 6 to 12, inclusive, are diagranmiatic views of spring arrangements alternative to that shown in Figure 2.

Referring to the drawings in detail, like parts being designated by like reference characters, and iirst considering the embodiment of my invention illustrated in Figures 1 to 5, inclusive, there isshown a portion of a railway truck comprising a side frame 'l preferably formed of castwk steel, although it will be clear that some of the advantages of my invention may be obtained when using frames of other than cast construction. Said frame I comprises a compression member 2, a tension member 3, and bolster guide columnsor strut portions 4 spacing intermediate portions of said compression and tension members leaving a window opening 5 therebetween. The compression and tension members extend outwardly beyond the bolster guide columns 4 where they join with one another and are either provided with integral journal boxes (not shown) or are adapted for connection with journal boxes, as will be understood by those skilled in the art. In the present embodiment of my invention the truck illustratedis one of a relatively short wheel base, so that the brake hanger brackets 6 are spaced very close to the guide columns and relatively close to one another, as illustrated particularlyin Figure 1.

The tension member 3 between the bolster columns is generally box shape in cross section and comprises an upper web 'l forming aspring plank seat, a lower web B and side webs or flanges 9 and I li, respectively. For rigidifying and strengthening the side fra-me and particularly the tension member and the junction between the tension member and bolster guide columns, said tension member is upwardly convoluted or embossed preferably along the longitudinal center line of the frame adjacent the junctions with the bolster guide columns to form upper diagonally disposed web portions Il which start near the center of the spring plank seat portion or upper web 1 and extend diagonally upward through the bolster guide columns toward they ends "pf the frame. In the embodiment` illustrated, the

spl'ingplankseatisofasizeadaptedtosupporttherefore, to have the reinforcements II extendv from near the center of the spring plank seat to the guide columns without closing up too much of the window opening, said reinforcements preferably extend to the guide columns on a moderate inclination and after their union with said columns they are continued upwardly and outwardly at a much steeper inclination, as indicated at I2 to correspond more closely with the relatively steep inclination of the main inclined end p0rtions of the tension member. 4In this respect they differ from the construction of the side frame described and claimed in my prior Patent No. 1,652,808 of December 13, 1927.

The reinforcing construction heretofore described results, in effect, in a bifurcation of the upper web of the tension member. producing a triangular or inclined reinforcement at the junctions betwem the tension member and bolster guide columns and in addition forms embossments with which the spring plank is adapted to engage, thereby obviating the necessity of the usual squaring lugs or providing squaring means in addition to said lugs. The reinforcement also has the etfectof reducing the effective depth of the window opening 5 for thensertion of the associated bolster I3, thereby making it desirable to decrease the height of the front or outer guide lugs Il to corresplmd with the distance between the bolster guiding portions I5 and the reinforcements I I. 'Ihe rear or inner bolster guide lugs I6 may be of normal depth, if desired.

In order toprovide an adequate spring-sup-v porting area or spring plank seat, the upper web 'I between; the bolster guide columns is laterally widened beyond the webs 9 and III, as indicated at II and Il. 'Ihese extensions I1 and I8 are preferably braced with respect to the webs 9 and Il by triangular gusset portions I9. The webs of the box-shaped portion of the tension member may likewise be braced interiorly by gusset or interior web portions 29, as shown most clearly in Figure 3.

t In order to provvide for a relatively great height or vertical dimension of the window opening 5, the compression mmnber 2 thereover is preferably of decreased depth or has a web 2I with depending flanges 22 which are, narrower or shallower over the window opening than on either side thereof. In`order, howevento provide for substanally'uniform strength in the compression member, said flanges 22 preferably have beading 23 along the lower edges thereof, which beading is desirably of greatest sise or width over the window opening or between the guide columns and tapers' to d size or width on either side of the window opening, as indicated at 24, said ybeading preferably sloping downwardly and outwardly to correspond with the lower edge of the compression member, as shown most clearly in Figure 1, and starting over the guide columns to of the tension member is preferably formed with a pair of upwardly extending bosses 2,8, preferably corresponding in diameter with the inner dimension of the spring units intended to be used, and being sumciently longer than the thickness of the spring plank so that they extend thereabove and provide spring-positioning bosses, as shown'most clearly in Figures 1, 2 and 3. If desired, certain of the bosses 21 may have the parts thereof, where they pass through the spring plank, of greater diameter than the spring-locating 'portions thereabove. If all of the spring units of the associated nest of springs 28 are double coil, as illustrated in Figures l and 2, the spring-positioning portions have diameters corresponding with the inner diameter of the inner coil, whereas if some of the spring units are single coil, as illustrated in some of the modifications to be hereinafter described, the spring-positioning portions may have a diameter corresponding with the inner diameter of the outer or single coil spring so that in this case the lugs 2'I may be of uniform diameter larger than the lugs 2 6 which merely position the inner or small coils of the spring units. When using the larger springpositioning bosses or lugs 21, whether or not they are used with single or double coil spring units, v

the diameter thereof where they pass through the spring plank 25 preferably corresponds with the inner diameter of the outer spring or a single 'spring unit, so that in case such lugs are used with single coil springs or spring units, the diameter may be approximately uniform throughout the length.

The spring plank 25 is not only apertural to receive the bosses 26 or the bosses 26 and 2'I, but is upwardlyembossed or corrugated, as indicated at 29,' to nest over the corrugations or embossments II on the associated side frame. The inner boss 26, as well as the outer one, is desirably offset with respect to the longitudinal center line of the-corrugations, as shown most clearly in Figure 2. The width of the spring plank at its outer end preferably corresponds with the width of the window opening and, in lthe present embodiment,'is sufficient to receive three standard spring units disposed longitudinally of the associated side frjame or transversely of the spring p1ank,outwardly of the embossments 29 and one standard spring unit directly between said embossments, or on the transverse center line of the frame or longitudinal center line of said plank and aligned with the central onev of the three outer spring units, as illustrated particularly in Figure 2. In order, however, to avoid interference between the inside hung brake beams or rigging depending from the brake hangers, which, as previously explained, are abnormally close because of the short wheel base ofthe frame, the spring plank 25 tapers or 'decreases in width from its ends beneath the window opening so that the row of spring units inwardly of the embossments 29 can only be two units long rather than three, as shownmost clearly in Figure 2.

In order to maintain a spring capacity corresponding with the H shaped spring grouping described and claimed in my previous Patent No. 1,652,808, an additional spring unit 30 is preferably disposed inwardly of the two spring units which are inward of the corrugations 29, said additional spring unit being desirably positioned along the center line of the spring plank and forming with the adjacent spring units, a triangle, which in the present embodiment is substantially equilateral. It will be noted that this till dit@

liti

additional spring unit is positioned so far inward, in order to provide normal clearance with respect to the adjacent springs, that it extends beyond `the flange I8 of the tension member, making it impossible to position it by a lug or boss on the tension member. The positioning of lthis spring unit is preferably effected by means of a boss 3l on the spring plank, either formed integral with said plank or connected thereto in any desired -In order to facilitate the assembly of the springs, and the application of shims, if necessary,

spring plate 35 is preferably disposed above said' springs, said spring plate being formed with spring-positioning collars 36 for engagement with all of the spring units and preferably conical spring plate locating bosses 3l adapted to iit in.

corresponding pockets 38 in the associated bolster i3. The bolster, of course, has a horizontally disposed necked portion 33 which preferably tapers in width to correspond generally with the tapering of the nest of springs and associated spring plank, said horizontal portion preferably being merely extended locally, as indicated at 1lb, to receive the innermost spring unit or corresponding portion of the spring plate 3b, thereby providing a pocket lli adjacent the longitudinal center line of the bolster and avoiding unduly increasing the length of the necked portion for the full width of the bolster.

Referring now to the embodiments of my invention illustrated in Figures 6 to 12, inclusive, alternative spring groupings are there shown for capacities less than that ofA the previous embodiment. In the previous embodiment, for example, I provide for a seventy-ton capacity, while Figure 7 shows an arrangement similar to Figure 6, but for forty-ton trucks, except that all of the spring units are single coil and the innermost unit is omitted rather than the central unit between the reinforcements ll.

Figure 8 shows an arrangement corresponding with Figure 6, except that the springs are arranged as two triangular groups, one inwardly and the other outwardly of the reinforcements Il, each group comprising twq double-coil and one single-coil unit, the intermediate single-coil spring being offset or buckled inwardly in each instance. .This arrangement is adapted for fiftyton trucks.

Figure 9 shows an arrangement corresponding with Figure '7, except that four of the six spring units are double-.coil rather than all being singlecoil adapting the arrangement for use with ftyton trucks,

Figure l shows a further modification adapted for forty-ton trucks using only five instead of six spring units, three of which are double-coil and two single-coil. The springs in this embodiment are arranged H shape in plan, but the uprights of the H are composed of two rather than three spring units.

Figure 11 shows a further modification using six spring units arranged in two triangular groups, the outer group comprising double-coil units and the inner single-coil units, both of said groups Vbeing arranged in approximately equilateral triangular formation. This arrangement is adapted for fifty-ton trucks.

Figure 12 shows a. further modication correspending with Figure 10 for forty-ton trucks using five spring units arranged l-l shape in plan with the outer upright of the H composed of double-coil spring units, the cross piece of the H composed of av double-coil spring unit and the inner upright of said H composed of single-coil spring units.

From the foregoing, it will be seen that I have devised an improved truck with a shortened wheel base while at the same time providing for increased spring capacity and avoiding interference between the inside hung brake beams or rigging and the spring plank and associated springs. A1- though preferred embodiments of my invention have been illustrated, it will be understood that I do not wish to be limited thereto as modifications rnay be made within the spirit and scope of my invention as defined by the appended claims. It will also be understood that although l. have shown only one side frame and the associated ends of the bolster and spring plank, my truck, as is usual, is formed-with two side frames, each of which supports an end of the spring plank and bolster.

I claim:

1. A side frame comprising a compression member, a tension member, struts spacing intermediate portions of said members and leaving a window opening therebetween, that portionof the tension member beneath the window opening Vforming a spring plank seat, said tension member outwardly of said seat comprising inclined end portions, each of which consists of upper and lower portions angularly disposed with respect to each other, the inclination of said upper portions changing at the struts so that they'extend inwardly at a decreased inclination to merge with the spring plank seat adjacent the center thereof.

2. A side frame comprising a compression -memberv a tension member, struts interposed therebeiwern and spaced to leave a window opening, that portion of the tension member beneath the Window opening being formed to support bolster springs, the tension member extending toward the ends of the frame from the springsupporting portion thereof to form diagonally disposed end portions, each end portion comprising a plurality of sections, one of saidsections starting from near the center of the spring-supporting portion, sloping upwardly and outwardly to the adjacent strut and fromthere sloping upwardly and outwardly at a materially increased inclination toward the adjacent end of the'frame, and another sectioni starting near the adjacent end xof the spring-supporting portion and sloping toward the adjacent end of the frame.

3. A side frame comprising a compression membolster guide columns reinforced by upwardly em-` ber, a tension member, bolster guide columns interposed therebetween and spaced to leave a window opening, that portion of the tension member beneath' the window opening being adapted for supporting' bolster springs, said tension member extending toward the ends. of the frame from the spring-supporting portion thereof and consisting of an upper web portion, and another web portionA disposed therebeneath, said portions starting from different parts ofthe spring-supporting portion of the tension member and converging at their upper and outer ends, the inclination of said upper web portion sharply changing -where it meets the bolster guide columns so that the outer portions thereof have -a steeper slope more nearly approximating that of the otherportions.

4. A side frame comprising a compression member, a tension member, bolster guide columns spacing intermediate portions of said members and spaced to leave a window opening, reinforcing members extending between the tension member and guide columns diagonally across the lower corners of the window opening being angularly disposed from that portion of the tension member outwardly of said column members, that portion of the compression member above the window opening being relatively small in depth to provide for a relatively high window opening with the portions outwardly thereof of a depth increasing from a straight top edge, the lower edges of said compression member being provided with beading, the depth of which is greatest over the window opening and decreases on either side of said window opening to compensate for the ranged` with three units on a side omitting the.

units at'the bolster columns and with the units on the inner side of said frame disposed in triangular formation.

6. In a railway truck, in combination, a side frame comprising compression andtension members spaced at intermediate portions thereof by bolster guide columns leaving v afwindow 'opening therebetween, that portion of the tension member beneath the window opening being laterally widened. with the junction between it and the bossed portions extending along the longitudinal center line thereof from 4near the center through the bolster guide columns toward the ends of the frame, a nest of springs supported on said portion, said springs being arranged in two groups lying on each side of the upwardly embossed portions, and a central spring disposed between said groups and embossed portions, the group on the inner side of said embossed portions being arranged in triangular formation with an intermediate spring disposed inwardly with respect to the other springs.

7. In a railway truck, in` combination, a side frame comprising a compression member, a tension member, bolster guide columns interposed therebetween and spaced to leave a window opening, that portion of the tension member beneath the window opening being formed for supporting a nest of springs and reinforced with rpect to the bolster guide columns by triangular upwardly extending embossments between the ends or! said portion and the bolster guide cohnnns, said elnbossments lying along the longitudinal center line of the frame, and a group of springs on each side of said embossments, other springs disposed as a transverse group between said embossments, and an additionalspring disposed inwardly of the group positioned on the inner sid of said embossments.

8.- In a railway tnick, in combination, a side frame comprising a compression member, a tension member, bolster guide columns spacing intermediate portions of said members and leaving a window opening therebetween, that portion of the tension member beneath the window opening being formed with embossments extending between the ends thereof and the bolster guide columns', a spring plank supported on said tension member and formed with corrugations interlocking with the embossments, a nest of springs supported on said spring plank and arranged in modified H formation, the uprights of said AH-lying longitudinally of the frame on opposite sides of the corrugations of the spring plank, and the cross part of the H lying longitudinally of the spring plank right of said H being of reduced height, thereby lnecessitating'the positioning of an' intermediate spring thereof inwardly of the line of the other springs.

9. In a railway truck, in combination, a side frame comprising compression and tension members spaced at intermediate portions thereof by bolster guidevcolumns leaving a window opening therebetween, that portion of the tension member beneath the window opening being adapted to support a spring plank, a spring plank supported on said tension member, a nest of springs supported on said spring plank, said spring plank having the outer end thereof corresponding in width with the width of the window opening and decreased in width beneath said windowvopening, the nest of springs supported thereon being arranged with a greater number of springs in line at the outer end of said plank than at portions inwardly thereof.

10. In a railway truck, in combination, a side frame comprising a compression member, a tension member, bolster guide columns interposed therebetween and spaced to leave a window opening, said frame being formed with brake hanger brackets disposed abnormally close together because of the frame having an abnormally short wheel base, that portion of the tension member beneath the window opening being formed with a spring plank seat, a spring plank supported on said seat, and a nest of springs supported on said spring plank, said spring plank and the nest of springs thereon being arranged to decrease in width from the end of the plank to avoid nterference with associated brake rigging.

11. In a railway truck, in combination, a side frame comprising a compression member, a tension member, bolster guide columns interposed therebetween and spaced to leave a window opening, said frame having a short wheel base and provided with brake hanger brackets disposed correspondingly close together, said tension member being formed with a spring plank seat., a spring plank supported on said seat, said plank being formedwith its ends corresponding with the width of the window opning and Vtapered inwardly to decreased width beneath the window 75 opening to avoid interference with associated brake rigging, and a nest of springs supported thereon.

12. In a railway truck, in combination, a side frame of short wheel base formed with a compression member, a tension member, bolster guide columns spacing intermediate portions of said members and leaving a window opening therebetween, the tension member beneath said window opening being adapted to support a spring plank, a spring plank supported on said seat portion and formed of maximum width at its ends and tapering inwardly to decreased width to avoid interference with associated brake rigging on account of the short wheel base of the frame, a nest or springs supported on said spring plank, said springs being arranged substantially H shape in plan with the uprights extending longitudinally of the frame on either side of the center line thereof, a central spring unit disposed between said uprights and forming the cross part of the i-l, an additional spring unit disposed inwardly of the inner upright of said H, and a bolster supported on said nest of springs, said bolster being formed with a horizontal surface directly above said springs and corresponding in area with the plan thereof, said horizontal surface being extended locally as a relief or channel in the bolster ing, said frame beneath the window opening having a spring plank seat, a spring plank supported on said seat, said seat and plank being formed respectively with lugs and apertures rebill ceiving said lugs for locking said plank in `place, said lugs extending above the level of the springsupporting area of said plank and spaced to correspond with the spring arrangement desired, said plank being formed with a lug inwardly of said seat for positioning an inwardly disposed spring, and a. nest of springs supported on said plank to correspond with the seat lugs and the additional spring plank lug.

ld. In a railway truck, a side frame formed with a window opening, and a spring plank seat defining the lower portion of said opening, said seat having upstanding lugs, a spring plank resting on said seat and having apertures corresponding with said lugs for locking said plank in place, said plank having a lug connected thereto inwardly of the spring plank seat for positioning an additional spring, a nest of springs supported on said spring plank and positioned by said lugs,

a spring plate supported `on said nest of springs and formed with depending spring-positioning collars, a bolster resting on said spring plate, and

means extendingbetween said plate and bolstery for holding the parts in proper position.

l5. A nest of at least six bolster spring units formed as two rows with a central spring unit positioned directly between said rows making an arrangement substantially H shape in plan, and an additional spring unit disposed inwardly of the inner row of said arrangement.

16. A nest of at least seven bolster spring units for providing increased spring capacity and formed of maximum width outwardly and of decreased width inwardly of an associated side frame.

17. A nest of bolster springs comprising two groups of at least three spring units each adapted for disposition, one group on each side of the longitudinal center line of an associated side frame, the inner one of said groups being arranged in inwardly decreasing triangular formation, and spaced from the other group'with' no overlapping of peripheral boundaries.

18. A spring plank formed of maximum width at its ends and tapering inwardly at the portions normally received in side frame bolster openings, whereby it is adapted to support a nest of springs which decreases in width toward the center of said plank. l

19. A spring plate for a nest of springs formed generally H shape in outline and provided with at least six spring-positioning collars corresponding with the springs on the uprights and cross piece of said H, and an additional spring-positioning collar disposed laterally of one of the uprights of said H for permitting the employment of an additional spring unit to provide for increased spring capacity.

20. A nest of bolster springs comprising two groups each of at least three spring units, one group being arranged in triangular formation and disposed inwardly of the longitudinal center line of an associated side frame, and the other group being arranged in linear formation and disposed outwardly of, and with its periphery clearing, said longitudinal center line.

2l. In combination, a bolster having its ends formed with lower horizontal surfaces adapted to be supported by resilient means, and spring plates disposed in engagement with said surfaces, said plates being widest at the outer ends and decreasing in width at the portions normally received in side frame bolster openings to inner still narrower portions adapted to engage single spring units.

22. A spring plank having ends flaring outwardly to maximum width, the flaring portions of said plank having upwardly extending transverse embossments adapted to receive corresponding portions on associated side frames for interlocking therewith.

23. In a railway truck, in combination,. a side frame comprising a compression member, a tension member, bolster guide columns spacing intermediate portions of said members and sp-aced to leave a window opening therebetween, that portion of the tension member beneath the window opening'being formed as a generally flat spring plank seat with embossments tapering iromthe lower end portions of the balster guide columns to merge into the spring plank seat upper surface short of the central portionv thereof, a spring plank with an end portion supported on said seat and formed with corrugations nterlocking with said embossments, a. nest of springs supported on said spring plank and comprising a plurality of springs disposed along the longitudinal center line of said plank, said plank having a pair of apertures lying on its center line beneath said springs and both offset from and being on the same side of the longitudinal center line of said corrugations, and said frame having' lugs extending into said apertures to position said spring plank.

24. A spring plank comprising a supporting web and reinforcing anges at' the sides thereof, the ends of said plank being wider'than intermediate portions thereof and the flanges being narrower at the widened end portions than between said end portions, said plank decreasing 1n width toward its center along the portions normally disposed adjacent the guide columns of associatedside frames, and said web being pro vided with a plurality of apertures at each end aligned along the longitudinal center line and .adapted to receive spring plank squaring lugs on associated side frames.

25. A spring plank comprising a spring-supporting web and flanges at the sides thereof, said web tapering in width at an end portion and having a plurality of spaced apertures in said end tapered portion, adapted to receive lugs connected to an associated frame, and disposed along the transverse center line of said frame.

26. A spring plank having a bottom and side flanges extending throughout the length thereof, said plank tapering in width along portions normally disposed between the guide columns of associated side frames, so as to form, adjacent each end thereof, portions wider than the balance of the spring plank, said side flanges being of reduced height at the widened end portions of the plank.

27. A spring plank having a web and flanges at the slides thereof, said plank decreasing in width toward its center along the portions normally disposed adjacent the guide columns of associated side frames, so that it is wider adjacent the ends than intermediate the ends, said side i'ianges being reduced in height at the widened portions of the plank, and said plank at each widened end portion having a plurality of apertures extending longitudinally of said plank and adapted to receive squaring lugs on associated frames.

28. A spring plank comprising a supporting web and reinforcing flanges at the sides thereof, said plank being widest at the ends and decreasing in width from the end portions toward intermediate portions, along the portions normally disposed between the guide columns of associated side frames, said flanges being narrower at the widened end portions than between said decreasing portions, and said web being provided adjacent each end with a plurality of apertures aligned along the longitudinal center line, dis posed toward the ends from said intermediate portions, and adapted to receive spring plank squaring lugs on associated side frames, at least one aperture at each end being disposed in said decreasing portions.

29. In a car truck, in combination, a side frame formed with compression and tension members spaced at intermediate portions thereof by columns leaving a. window opening therebetween, said tension member beneath the window opening having a spring plate supported thereby and being formed with a spring-supporting portion, relatively broad adjacent the outer side of the frame and relatively narrow, for the support of a single spring unit, adjacent the inner side ofv said frame, and a nest of springs upheld by said spring-supporting portion, said nest comprising two rows of spring units extending longitudinallyl of said frame and disposed on either side of the longitudinal axis thereof, and a single spring unit disposed inwardly of the inner row of springs, over the narrow spring supporting portion of said frame.

30. In a railway truck, in combination, a side frame comprising compression and tension members spaced at intermediate portions thereof by struts and leaving a window opening therebetween, that portion of the tension member beneath the window opening being formed to support bolster springs, the tension member beyond the struts extending toward the ends of the frame to form diagonally disposed end portions, convoluted portions formed on said tension member intermediate said struts and sloping upwardly and outwardly to the adjacent strut at an angle of inclination different from that of the tension member beyond said struts, said bolster springs being arranged in two groups positioned on each side of the convoluted portions, one of said groups being arranged with three spring units and the other of said groups being arranged in triangular formation, and a single spring disposed on the longitudinal axis of said side frame and between said convoluted portions.

31. In a railway truck, in combination, a side frame comprising compression and tension members spaced at intermediate portions thereof by struts and leaving a window opening therebetween, that portion of the tension member beneath said Window opening being formed to support vbolster springs, the tension member beyond the struts extending upwardly and outwardly toward the ends of the frame to form diagonally disposed end portions, convoluted portions formed on said tension member within said window opening and sloping upwardly and outwardly from adjacent the vertical center of the side frame to the adjacent strut at an angle of inclination different from that of the diagonally disposed end portions, said bolster springs, formed as two rows with a central spring unit positioned directly between the two rows, making an arrangement substantially H-shaped in plan, the rows of springs being positioned on each side of the convoluted portions 'and the central spring disposed between said convoluted portions and on the vertical center of the side frame, one of said rows having anadditional spring associated therewith to form a group of triangular formation.

DONALD S. BARROWS.

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