US2392292A - Railroad car truck bolster - Google Patents

Description

Jan. 1, 1946. K. F. NYSTROM ET Al.

RAILROAD CAR TRUCK BOLSTER Filed Sept. 22, 1944 2 Sheets-Sheet 1 INVENTORS.

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1946- K. F. NYSTROM ET AL 2,392,292

RAILROAD CAR TRUCK BOLSTER Filed Sept. 22, 1944 2 Sheets-Shet 2 ZS s & A I A INVENTVORE- [fa/Z [Ag/500m,

Vernon! Greg/z,

Patented Jan. 1, 1946 or Fl C E RAILROAD TRUOKBOIESTER Karl T. :Nystrom, Nashotah, and VernonrL.

Green MiIWaukee, Wis.

Application September 22, I944, SBIiaYN'o. 555340 8:ClaimS. (CL "1'05-229) Our invention relates to a Iabricated truck bolster of the truss (type wherein the respective elements or members are welded to each other to provide a composite unit of preformed sheet metal sections of predetermined configuration and arrangement, an integrally united to each other, .and wherein the use of rivets is entirely eliminated.

Our improved bolster, which issomevvhat similar. to the old simplex type, is a material improvement thereof in .a number of essential --respects; as,for example the angle of the tension member, with respect to .the compression.member, hasbeenaltered from approximately fifteen degrees to thirtydegrees, thereby lowering the tension forces in proportion to the .sine of the respective angles. .Then too, with our improved bolster, the .forces encountered by the side bearings, as well as the center ,plate lload, have been provided .for in i an engineering manner by means.

of diverging .or triangularstruts or braces whichv may function as compression members on one side .and as tension members on the other :side depending on whether the load is on the center bearing -.or-on aside bearing; the invention .pro- 1 viding a truss type bolster wherein the tension loadsare reduced.

With -.our invention a complete beamstructure, regardless of the particular type of end plates or members employed, is provided, thus enabling any type-of bolster ends to be appliedin-keeping with the spring and snu-bbing devices employed on the truck; and at the same time the --use of end castings or forgings is eliminated.

The objects and advantages of our invention will be more .fully comprehended from the following detailed description of th accompanyin drawings wherein:

Figure 1 is a plan view of our improved truck bolster. t

Figure 2 is a side elevation thereof.

Figure 13 is an enlarged longitudinal sectional View taken on the line 3-3 of Figure '1, viewed in the direction of thearrows.

Figure 4 is a vertical sectional view -on the line 4--4 of Figured. Figure .5 .is a detail sectional view takenon the line 5-5 .of Figure 3, .lookingin the direction of the arrows.

Our improved truss type truck bolster in the exempliiication shown in the drawings consists of a top or compression member llhpreterably of channel .form in cross section, with comparatively wide side flanges U, and at trans-verse median line with an opening which is surrounded on the. lower side of member H) by a depending king pin receiving tube 12 which preferably is welded to the compressionmeniber IILas'shOwn. in Figure "3, and the top of member f0 about the central opening is providedwith the annular center plate l3 which is welded 'to the top memher. Thefbottom of tube T2 .is provided with a. king pin s'top or pin [4 which may be welded to the end of tube |2 as shown. 7

The top or compression member 4'0, at .predetermined distances removed from the center bearing plate, is provided with suitable side bearings [5, l5 which, in the specifi'cexemplification are shown in the nature of rectangular boxes I5 Welded to the top member and provided with yieldable or, wood filler blocks 1'6 provided with the metallic cap members ll. It will be understood that anysuitable type of side bearing may be employed.

The top or compression member .lfl extends substantially .in a straight .line from end to end and the ends are integrally united with the -upwardly sloping ends of the tension member or bar 18; the ends of the compression member IB and of the tension member l8 being weldedto each other, as shown at 19 in Figure 3, with the tension memberterminating in the :plane of the compression member as more clearly shown inFigureB.

The tension member 18 consists of a flat and comparatively thick strap or bar of predetermined length -formed with a straight horizontal intermediate portion I8 1, disposed ata greater distance beneath the compression member than has heretofore been the practice, with said portion t8 made to extend beyond opposite sides of the center bearing-portion of the compression member 10, where the ends of the tension bar are bent to provide the upwardly sloping portions I-8 whose ends are shown terminating adjacent to and in the plane of the upper surface of the compression member 10, with the ends of the compression member and ofthe tension member welded to each othenasindicatedat L9.

The bolster at opposite sides of its transverse median line is provided with brace means whereby the bolster-is reentorced at the load encountering points, namely at the center bearing and also at the side bearings as clearly shown i-nFigure :2. The straps or brace means as disclosed in the drawings, for the sake of easy forming, pref -v erably consist of the V-shaped. bars 20, with the bases or apex portions resting on the tension member at the iunctu-resof the intermediate hor-- izontal portion Ic and the upwardly slopingportions H3 and secured thereto by welding, as indicated at 2|, thereby firmly anchoring the brace members in place.

The diverging ends of the brace elements are intimately secured by welding, as indicated at 22, to the lower surface of the compression member 10, with one leg of each brace element secured beneath the center bearing member [3, in proximity to the king pin, receiving tube l2 while the other legof each brace element is secured directly beneaththe corresponding ide bearing 15.

These brace bars are shown in the nature of flat bars substantially the same width as the ten sion member I8, see Figure 4; and each strut or brace element preferably is provided with a web 23 of sheet metal cut'into triangular or V-shape form with its edges welded to the opposing faces of the V-shape strut members 2H, preferably midway between the longitudinal edges thereof, as shown in dotted lines in Figure 1, and to the lower face of the compression member, as more clearly shown inFigure 3. The webs 23, for the sake of lightness, are each provided with a cutout or hole 24; the webs act as stifieners and prevent buckling of the strut bars when subjected to compression strains;

The structure described constitutes a complete trussed beam to which any. type of end plates or members may be attached and in which the top or compressionmember is braced at the load bearing points by a pair of V-shaped struts which transmit the stresses or strains to the tension member'at spaced apart points removed from the transverse median line of the tension member, namely at the junctures between the horizontal intermediate portion 115* and the upwardly sloping end portions 18*, disposed intermediate the vertical planes of the center bearing and the side bearings.

tension members on theother side depending on whether the load is on the side bearing or on the center bearing; our improved bolster being designed, to eliminate difiiculties heretofore encountered, especially with the'old simplex type which frequently became fractured orbroken at the points subjected to side bearin loads. With our improved truss type bolster the tension forces are materially lowered in proportion to the sine of the respective angles at the juncturesrof the tension member with the compression member, re,- sulting from the type of tension member employed and its greatly lowered position while still maintaining the required clearance therebeneath; namely a bolster whose topor compression mem ber is free of undesirable bends and is substantially horizontal throughout its length; wherein proper {distribution of the strains, or stresses is obtained and the tension member provided with comparatively steep inclining end portions but without an undesirable sharp angle or bend in the intermediate portion thereof; the obtuse a; gles or bends in the intermediate portion of the tension'm'ember being braced bylou'r improved 1V- shaped struts or brace members."

In the particular exempliflcation, the bolster is shown provided with end portions of somewhat box-form, which may be cast or formed of sheet metal as shown,'provide'd with outer side walls 25, 25, bottom plate 26, top wall 21 and with inner side wall portions 28, 28. The top wall 21 is'longitudinally slit intermediate its side edges andthe partially severed or slit portion bent downwardly into contact with the bottom wall 26',

and preferably welded thereto, as shownin Figure 3, to provide the inclining tension member The struts or brace member functions both as compression members on one side and as a supporting ledge 29 which extends between inner walls 28, with the end of the tension member shown welded thereto, as shown in Figure 3. The

top or web portion of the compression member ID, at opposite longitudinal sides is reduced or cut away to leave the extension Ill at each end, which extends into the recess provided by the downwardly bent ledge forming portion 29, see Figures 1 and 3, and is welded to the tension member.- The bottom wall 26 of each end portion is shown provided with bolster spring centering lugs or seats 30; and the outer side walls 25 are provided with laterally disposed guides 3! for slid ably en a ing the columns of the truck side frame.

plication of the brake mechanism and to permit the connecting rod of said mechanism to be disposed at'thetop-of the truck bolster, we show the compression or top member of the bolster, at

opposite sides of the center bearing, provided with a pair of upwardly inclined lugs 32, apertured at trally with a center bearing and with side bear-j ings in proximity to the ends; a tension member provided with an intermediate horizontal portion extending lengthwisely'to vertical planes intermediate the center bearing and each side bearing, with the ends bent upwardly at a steep inclina- 'tion and brought into contact with the ends of the compression member at a comparatively high degree angle so as to lower the tension forces and welded thereto; and a'pair of upwardly diverging brace members at opposite sidesof the center of the bolster, with the lower ends of the brace members resting onand welded to the tension member at the ends of its horizontal portion, while the diverged upper ends of the brac mem-- bers are welded to the compression member at n points beneath the center bearin and the respective side bearing. I 1

2. In a truss type truck bolster, the combination of a flanged sheet metal compression member provided centrally with a center bearing and with side bearings intermediate its ends and'the center bearing; a tension member arranged beneath the compression member and provided with a horizontal portion extending to pointsintermediate the vertical planes of the center bea'r ing and the respective side bearings with the ends inclined upwardly into angular contact with and welded to the ends of the compression member at t horizontal plane from end to end provided with r a center bearing and with sid bearings in proximity to its ends; a tension member arranged be- In order to provide for either right or left ap-- the appendedjclaims neath the compression member and provided with end portions inclining upwardly into contact with the ends of the compression member at an angularity in excess of fifteen degrees, with the ends of the tension member and of th compression member Welded together; and a pair of V-shaped brace members whose diverging upper ends are secured to the bottom of the compression member beneath the respective side bearings and beneath the center bearing while the lower ends of the brace members are secured to the tension member at points intermediate the vertical planes of the center bearing and the respective side bearings. r v

4. In a fabricated truss type truck bolster, the combination of a flanged sheet metal top or compression member provided with a center bearing and with side bearings intermediate the center bearing and the ends of the compression member; a tension bar, spaced beneath the compression member, provided with an intermediate horizontal portion and straight upwardly inclining end portions terminating at the ends of the compression member and welded thereto; and a pair of V-shaped brace members intermediate the compression member and the tension bar and the apex of each brace member welded to the tension member at the respective end of its horizontal portion while the diverging upper ends are welded to the bottom of the compression member beneath the center bearing and the respective side bearing, said brace members being provided with reenforcing webs welded intermediate the upwardly diverging ends.

5. In a truss type truck bolster, the. combination of a flanged sheet metal top compression member, extending horizontally from end to end, providedcentrally with an opening; a king-pin receiving tube welded to the bottom of the com- ,pression member about said opening; a center bearing member welded to the top of the compression member about said opening; side bearings welded to the top of the compression member intermediate the center bearing member and the ends of the compression member; a tension bar, spaced beneath the compression member, provided with an intermediate horizontal position and straight upwardly inclining end portions terminating at the ends of the compression member intermediate the flanged sides and welded thereto; end portions welded to the flanged sides at the ends of the compression member and provided with declining tension member supporting portions welded to the ends of the tension member; and a pair of upwardly diverging brace members welded to th tension member and to the bottom of the compression member beneath the center bearing member adjacent the king-pin receiving tube and beneath the respective side bearings.

6. In a fabricated truss type truck bolster, the combination of a sheet metal top compression member, extending horizontally from end to end.

provided centrally with a center bearing member welded thereon and with side bearings welded to the top intermediate the center bearing member and the ends of the compression member; a tension bar spaced beneath the compression member and having an intermediate horizontal portion and upwardly inclining straight end portions terminating at the ends and in the horizontal plane of the compression member and welded thereto; and a brace member on each side of the transverse median line of the bolster welded on the tension bar and to the bottom of the compression member beneath the center bearing member and beneath the respective side bearing.

7. In a fabricated truss type truck bolster, the combination of a flanged sheet metal top compression member, extending in a horizontal plane from end to end, provided with a center bearing member welded thereon and with side bearings welded to the top intermediate'the center bearing member and the ends of the compression member; a tension bar, spaced beneath the compression member, provided with an intermediate horizontal portion, extending to points beyond the vertical planes of the opposite sides of the center bearing member, and with upwardly inclining straight end portions arranged in angular con tact with the ends of the compression member and l welded thereto; box-like end members provided with inwardly declining tension bar overlapping portions welded to the ends of the tension bar and said end members welded to the ends of the compressionmember and extending beyond the ends of the compression member in the horizontal plane thereof, the sides of said end members having laterally disposed spaced lugs for engaging the bolster opening columns of the side frame.

8. In a truss type truck bolster of prefabricated elements integrally united by welding, a compression member extending in a horizontal plane from end to end provided with a center bearing and with side bearings intermediate the center bearing and the ends; a tension bar arranged beneath the compression member and provided with end portions inclining upwardly into contact with the ends of the compression member at an angularity in excess of fifteen degrees, with the ends of the compression member and bar welded together; a pair of V-shaped brace members whose diverging upper ends are secured to the compression member beneath the center bearing and the respective side bearings while the lower ends are secured to the tension bar at points intermediate the vertical planes of the center bearing and the respective side bearings; and end members whose tops are adapted to receive the top portion at the ends of the compression member and provided with downwardly sloping tension bar end supporting portions.

KARL F. NYSTROM. VERNON L. GREEN.

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