US2621611A - Railway truck - Google Patents

Description

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Dec. 16, 1952 F'lled Jan 5. 1947 Dec. 16, 1952 Filed Jan. 5. 1947 Fig.3.

D. s. BARROWS RAILWAY TRUCK 2 SHEETSSHEET 2 3 rw rm tom Donald A. Barmws.

Patented Dec. 16, 1952 UNITED STATES PATENT OFFICE RAILWAY TRUCK Donald-S2- Barrows, Rochester," N; Y., assignor to The Symington-G'ould Corporation;-- Depew,- N. Y., a corporation of Maryland Application January 3, 1947, Serial No.'720,068

31 Claims. 1

This invention pertains'to a railway truck and more particularly .to' the structure in or adjacent tothe windowopening of a side frame thereof. An object of the invention is the provision, in

an improved railway'truck', of abolster movable vertically and transversely relative to a side frame with'both of said'movements snubbed by! tical movement and to 'befrictionally engaged thereby during a transverse mvement.

The above and numerous other as Well as more-detailed objects of the invention will become apparent upon a reviewofthe succeeding description and the accompanying drawings, wherein:

Figure 1 is-a partial front elevational and partial vertical sectional view ofa railway truck embodying a' form of the present invention:

Figure 2 is a'partial plan and'partial horizontal sectional viewtaken along the-lines 2- -2 of Fig-' ure'l, looking in the directionof thearrows;

Figure 3 is a' transverse and vertical sectional view taken along the lines 3-4 of Figurel, lookring in thedirection of the arrows.

Figure 4 is a vertical sectional view taken along the 'lines 4--4-of Figure 1, looking in the'direction of the arrows.

Referring now in detail to the variousfigures of the drawings, wherein like reference characters indicate like parts, the numeral l is employed, in a somewhat general manner, to indicate a railway-truck, preferably of 5 the four wheel type: Only a portion at or adjacent to a' center andone side-"of the truck is illustrated since the undisclosed portion is -'of no'present moment and mayyif desired, be of conventional form. The" railway truck comprises a side frame 2, only'a central area: of which is shown since'itwill' be understood by those skilled in the art to which this invention pertains that a railway truckpf the-class herein considered comprises twoside frames, oneat each side of the truck, forming structural members for connecting integral or separate'fiournalboxes (not shown) and trans* mittingloads thereto;- The side *framecomprises a top 'm compression member '3 spaced vertically 2 from a lower or tension member 4'bo'th of which are'"joined intermediate their ends by longitudinally spaced, vertically extending columns 5 to present or define a window opening 6 therebetween; The compression member is somewhat conventional in transverse section in that it comprises a top web 311 having laterally spaced flanges 3b depending'therefrom. The lower free edgesof the flanges are joined by connecting a rib'3c. The 'tension'member is also of some-' what conventional formin that its central horizontal portion comprises an upper web or bottom spring seat forming member 4a extended laterally of the side frame beyond the normal limits thereof to present an adequate bearing area for the accommodation of a nest of coil springs 1 (shown diagrammatically). Spaced a suitable distance below the spring seat forming member is a lower web 4b of less horizontal extent than its companion upper web and joined thereto by suitable side flanges 40. The central portion of the tension member extends horizontally substantiallybetween the columns from'which locations they are directed upwardly as at 4d where,

conventionally, they join (not shown) with the compression member. Also characteristically of sometypes' of side frames the bottom spring seat formingwmember has, upstanding from lateral edges thereof, reinforcing flanges 4e which ex-' tend along the central horizontal portion to merge with the columns and upwardly directed parts 4d; Finally, so far as the tension member is concerned, it will be observed that the upward Iydirected parts are of double truss design with the top trusses 4g thereof cutting diagonally across the lowercorners of the window opening to merge with the bottom spring seat member at a spaced location removed from the related columns (see Figure 1) Each guide column comprises a vertical" transverse web"5a which at its upper end blends into compression member ribs 30 and its lower end merges withthe top truss 4g of the tension-member: Ea'chcolumn transverse web has outstanding therefromtransversely spaced flanges 5b di-' rected longitudinally of the truck toward arelated end thereofand' merging at its respective zly in'di'cated' in Figure 1 of the drawings.-

As'previously" stated, the central portion of thetension member functions additionally -'as a supporting area for a nest or group of conven tional 1 coil" springs indicated diagrammatically as at I;

Thegroup of springs function as a' yieldable support for a bolster 8, the latter of which extends between the related side frames as a load transmitting member and has an end 9 thereof disposed within the side frame window or opening 5. As will be appreciated, the truck proceeding along supporting rails will have its wheels passing over contiguous ends of rails, cross overs, switches, etc., which will cause the wheels to move vertically because of the differences in elevations of supporting surfaces at these locations. Also it may be observed that road beds are somewhat yieldable in character and thus a very slight vertical weaving action will be imparted to supporting rails as the truck passes thereover or therealong. Because of these recognized irregularities in the supporting rails the respective side frames of the truck will execute an action or motion akin to that of a hobby horse or rocking chair. In order to prevent the transmission of the natural hobby horse action of the side frame to the bolster it is to be here noted that the bolster is made up as a composite structure comprising, generally, a main bolster member 8 and an equalizing member, end plate, top spring plate or chair Hi positioned below and preferably in direct supporting relation with each bolster extremity 9.

The chair is arranged within the window opening and has a main plate or Web i i disposed substantially horizontally and positioned intermediate the height of the chair. A lower face or surface [2 of the web bears upon the subjacent nest of springs and extending downwardly from the web are laterally spaced vertical flanges l3 which reinforce the chair and prevent an unwarranted or accidental transverse displacement of the upper extremities of the springs forming the nest. The upwardly facing portion of the web is formed in part by a concave, cylindrical or arcuate, cradle forming surface it which terminates short of the horizontal limits of the web and is disposed in a substantially centralized position with the radius of curvature lying on a medial line or in a transverse vertical plane of the truck as indicated by the diagrammatic line A-A and as shown only in Figure l of the drawings. A bottom wall l5 of the bolster end is also provided with a cylindrical, curved or arcuate surface [6 but this latter surface is convex in character and desirably of a radius different than, but preferably shorter than that of the plate surface M. The surface i6 is struck from the same medial line AA and thus only a limited area of the bearing, arcuate surfaces i4 and is will be in engagement with one another and when the components of the truck are in their normal or illustrated positions this limited area of contact will be at or adjacent to the transverse medial line of the truck to allow the side frame and other components, inclusive of the chairs to rock in either directions and freely beneath a bolster end without imparting any of such movements to the bolster proper.

Means has been incorporated in the composite bolster structure to maintain the related components in a predetermined relationship and thus prevent a shifting action of one arcuate surface relative to another arcuate surface. In other words, aside from a desired relative rocking movement between the bolster proper and chairs it is preferred to have these elements move vertically and transversely in unison as a single or unitary bolster structure, for, among other reasons quite apparent, to assure a proper disposition of the cylindrical surfaces [4 and I6. Toward the accomplishment of the above the chair intermediate web is provided with a series of outer teeth ll disposed in series or alignment longitudinally of the truck and positioned outwardly of the truck from but adjacent to the concave surface. The outer teeth are arranged as a segment of a gear and accordingly have the pitch circle thereof coincident with the related concave surface. The bottom wall i5 of the bolster is provided with a series of downwardly extending, outer teeth i3 also arranged as a segment of a gear and having a pitch circle coincident with the related bolster convex surface It and being arranged to mesh with the chair outer teeth. Disposed inwardly of the truck from but adjacent to the chair concave surface is a second or inner row of teeth Ila extending upwardly from the chair web and formed as counterparts of the chair outer teeth. To facilitate the manufacture of the bolster the bottom wall thereof adjacent to the inner limits of the convex surface is indented or recessed as at it. A separate segment of a gear 28 is disposed within the recess and is welded or otherwise secured to the bolster bottom wall. The gear segment 2% has downwardly extending inner teeth 21 meshing with the chair inner teeth and are substantially counterparts of the bolster outer teeth. It will be noted therefore that the intermeshing bolster and chair teeth maintain the cylindrical surfaces in a predetermined or fixed relationship and also prevent the bolster from assuming a horizontal angular posi tion relative to its supporting associated chairs. Studs or posts 22 upstand from the chair through suitable apertures in the bolster bottom wall with keys or cotters 23 passing through the posts within the bolster. This construction prevents an accidental separation of the components forming the composite bolster structure.

From the description hereinabove set forth of the illustrated exemplification of the invention it will be noted that the arrangement forms a quick wheel change truck. In this regard it is to be noted further that upon a removal of the cotters 23 the bolster proper is elevated to a position where the bottom wall of the bolster clears the posts 22 and thereafter the side frame may be moved laterally away from the bolster end 9.

Since it is preferred to employ a group of all coil springs for the support of the composite bolster structure for reasons which are obvious, snubbing or friction creating means are incorporated in the truck structure to control or dampen out vibratory actions of the group. With this thought in mind each column is provided with transversely spaced, auxiliary flanges 24 which are vertically directed and extend in a direction toward the transverse medial line of the truck. These auxiliary flanges are formed integrally with the column webs in substantial alignment with their companion flanges 5b and the auxiliary flanges on each column are inclined or sloped transversely or longitudinally of the truck. This auxiliary flange arrangement, the reason for which will be hereinafter made apparent, presents a tapered or somewhat bell-mouthed housin exposed toward the center of the side frame and communicating with the bolster or window opening. So as to reinforce the auxiliary flanges against stresses to which they will be subjected in service, each auxiliary flange, which it might be here noted extends vertically for only a lower part of the full height of a related column, has its free end or edge provided with a vertically extending, terminal web 25 directed transversely and outwardly of the side frame. The terminal webrof each auxiliary. flange merges at its :lower extremity; into the tension .member .whileat. its:

upperz:extremity it extends across the-column flangesgbto be formed integral .witha related auxiliary flange. The-longitudinal .endsof the chair "web I I are formed integrally withvertical endgwalls28 which extend transversely: of they truck:beyondthe-horizontal limits of the terminal;

structure. This somewhatfiexible connection. between the :bolster structure and. side frame is preferred in the instant embodiment of the inventionsothattany lateral impulsestimparted to the' side frame during service movement thereof will not be transmitted tothe bolster:

Confined.zwithin. each 1 housing defined by a columniweb; column auxiliary flanges' and chair endxwalhare .a plurality; prefe'rablya pair of counter -p'art shoes :29 .each having a longitudinallyt'diagonal and vertically extending rubbing surface 230:.maintained, at all times, in intimate contact .with a correspondingly disposed rubbing surface 3| carried by the adjacent column auxil iary'fiange. The shoes of each pair are'urgedapart :transversely of the truck by any type of compressible or resilient means which, in the instant structure; is characterized by a single coil or? helical compression. spring 32. Vertically spaceditransversely and horizontally extending arms 33 are formed on each shoe with the arms having angularly disposed fingers 34 at their terminals; The fingers of related shoes are spaced from one another soas to allowa breathings'actionv of theshoes and more particularly to prevent the friction means, inclusive of the shoes and. interposed spring. from exploding upon the removal thereof fromthe side frame. Each arm side: wall. has: outstanding therefrom vertically spaced shelves or ledges 35 formed integral therewith: and; xtendingihorizontally into a related column-with. adequate-space of clearance =th'ereabout :So as to not interfere'wi-th the column. The; chair fshelves have surfaces 36 i facingone another and arranged to: contact crowned or 'con-' vex surfaces. :31 on the shoe arms thereby l being arranged to move the shoes vertically during any service flexures of the spring group and also-allow* a transverse or tilting action of the side'frame and friction means without disturbing'the normal transverse position of the bolster and its supporting chairs. Any movement of the chair in a vertical direction will,. therefore, be reflected ina. corresponding movement. "of the friction shoes and a relative movement of the rubbing surfaces and, 3| the latter of which will snub, check or dampen out vibratory-actions of thespring 'nest."

As noted by referringparti'cularly' to Figure 4 of-the drawings, the helical compression spring 32 is so arranged or disposed that its axis extends diagonally and transversely of the truck with itsends bearing against normally positioned spring seats -38. Such a disposition of 'theheli calv compressionspring results intthetshoes of a pair being urged vertically in opposite directions. to result inone shoe .being pressed up-- wardly against a related shelf and the compan' ion shoe being urged downwardly against a related shelf to prevent the shoes and shelves from setting up any, chattering; during service ..-move= mentsthereofits previouslysetforth there are, inthe-bolster;-.75:Drovided with. aawindow opening defined b'y co1- side frame connection: provisions; for: relative transverse movements therebetween and inorder to check'r'or "control :these movements. each" side wall of the tchair carries :an outwardly exposed:- brushing. surface .39 which extends verticallyxand;

transverselyrof the'truck: Due :to the particular disposition of the rubbing surfaces; the shoes will.

be urged'outwardly of the columns andaccording-r ly;.each shoe carries an" outwardly exposedsplane-r surface: 40 arranged to bear against .a- :related brushingi surface so that frictional forces willbe created; thereon: during any relative transverse or tilting movements of the side'frame and chair:-

orbolster;

In: order to partially shieldthe friction means against the entrance thereinto of dirt onother:

abrasive particlesxeach bolster side wallaj lis provided; with an outstanding" hoodelike member fl madeupjtof a.:top Wall .43 -'overlyingithe fric' tion: means. intzvertical spaced .relation .theretoandextending longitudinally of the truck towardthe ;related J column 1 web' but terminating short thereof to allow for normal service movements of the bolster proper. Each topiwall extends transversely. of the truck.. a. predetermined distance where. it merges with a related vertically directed end wall.44.1 From the above .it will be noted thatvarious changesand alterations may be made to theili with: a side :fram having columns defining ia window opening 1' with a bolster rend ositioned in the opening, a nest of springs carried by-said side frame withinsaid opening, a chair mounted on said.:nest of springs and having vertically spaced ledgesextending into said columns,'verti cal surfaces carriedby said chair, friction means movable vertically by said ledges and arranged to engage frictionally said columns and chairvertical surfaces, and engaging rocker surfaces carried by said bolster and chair.

2. In a railway truck wherein aside frame isrprovided'with arwindow opening definedby columns and. .a bolster "end is positioned within the =opening,the combination of, a spring sup:-

, ported .chair within said opening and having ver-' tically' spaced. flanges extending into" said col-'- umns-,:fric.tion means movable vertically by'saidchairrflanges for frictionally engaging said col-' umns,.- andzcontacting' arcuate surfaces of (iiiferent .radiion said bolster and'chair' for al-' lowing said chair to rock longitudinally of saidtruck. beneath said bolster.

3. vInairailway truck wherein a side frame-is provided with a windowopening defined by columns and a bolster end is positioned within'the opening; the combination of, a spring supported chair within said opening and having vertically spaced-ledgesextending into said columns, said" chair being arranged to move vertically and transversely of said 'side' frame, friction means with.-

in said columns and movable verticallyby said.

umns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having vertically spaced longitudinally extending shelves disposed in said columns, vertical surfaces on said chair within said opening, transversely spreadable friction means disposed between and movable vertically by said shelves, said chair being movable vertically and transversely relative to said side frame, said friction means being so arranged and constructed as to frictionally engage said columns and chair vertical surfaces for snubbin all of said movements of said chair, and engagin'g arcuate surfaces on said chair and bolster for allowing a rocking action between said bolster and chair.

"5. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening, vertically spaced shelves on said chair and extending into said 001- umns, transversely spreadable friction means within said columns and movable vertically by said shelves for frictionally engaging said columns, inclined surfaces on said columns and friction means for directing said friction means toward said opening into engagement with said chair, and arcuate surfaces of different radii on said bolster and chair for allowing a relative rocking motion between said chair and bolster.

6. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and carrying said bolster end, outstanding ledges at the vertical limits of said chair and extending into said col umns, friction means spreadable transversely of said truck into engagement with said columns, said friction means being movable vertically by said chair ledges, a concave surface on said chair, and a bolster carried convex surface of different radius than and bearing upon said chair concave surface.

7. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and carrying said bolster end, substantially parallel outstanding ledges at the vertical limits of said chair, friction means Within said columns and spreadable transversely into frictional engagement with said columns, said friction means being movable vertically by said ledges, a concave surface on said chair intermediate the height thereof, and a bolster associated convex surface of different curvature than and bearing upon said chair concave surface;

8. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and supporting said bolster end, substantially parallel outstanding ledges at the vertical limits of said chair and extending into said columns, substantially vertical surfaces carried by said chair between said ledges, said chair being arranged to move vertically and transversely relative to said side frame, and friction means movable vertically by said chair ledges; said friction means being arranged to engage said columns and chair surfaces for snubbing all of said chair movements.

9. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and supporting said bolster end, substantially parallel outstanding ledges adjacent the vertical limits of said chair and extending into said columns, substantially vertical surfaces carried by said chair between said ledges, said chair being arranged to move vertically and transversely relative to said side frame, friction shoes Spring pressed transversely and movable vertically by said chair ledges, said shoes being arranged to engage frictionally said columns and chair surfaces for snubbing relative movements between said chair and side frame, and means on said chair for limiting said chair transverse movements.

10. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening, substantially parallel outstanding ledges adjacent the vertical limits of said chair and extending into said columns, friction shoes movable vertically by said ledges and spring pressed transversely into frictional engagement with said columns, a cylindrically disposed surface on said chair intermediate the height thereof, a cylindrically disposed surface on said bolster bearing upon and of different curvature than said chair cylindrically disposed surface, and means on said chair and bolster for preventing relative horizontal angular movement therebetween.

11. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having spaced transverse vertical surfaces adjacent said columns, said chair being arranged to move transversely relative to said side frame, vertically spaced ledges extending into said columns from adjacent the vertical limits of said vertical surfaces, spring pressed shoes within said columns movable vertically by said ledges and arranged to engage frictionally said columns and chai surfaces,'an arcuate surface intermediate the height of said chair, and an arcuate surface on said bolster in engagement with said chair arcuate surface.

12. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening, said chair being arranged to move transversely and vertically relative to said side frame, vertically spaced ledges extendin into said columns from said chair, spring pressed shoes within said columns and between said ledges and arranged to be moved vertically by said ledges, said columns and shoes being arranged to direct said shoes into intimate contact with said columns and toward said opening against said chair for snubbingboth of said chair movements, rocker means formed on said chair and bolster, and interlocking means formed on said chair and bolster for holding said rocker means in a predetermined relationship.

13. In a chair for use between columns of a side frame, the combination of, a web disposed intermediate the height of said chair, vertical end friction walls spaced apart and extending above and below said'web and arranged to be positioned standing from adjacent the vertical limits of said wall in a direction away from said web, and a rack adjacent said concave surface.

15. In a chair for use between columns of a side frame, the combination of, a web disposed intermediate the height of said chair, vertically disposed end friction walls spaced apart and extending above and below said web and arranged to be positioned between and adjacent to said coumns, a friction surface carried by said end walls for constant engagement by a friction means, and vertically spaced substantially horizontal ledges outstanding from said side Walls in a direction away from said web.

16. In a chair for use between columns of a side frame, the combination of, a web disposed intermediate the height of said chair and having a downwardly facing spring seat and upwardly facin bolster seat, vertical walls on said web at sides thereof and extending above and below said seats, outwardly facing surfaces on said walls for constant engagement by friction means, and vertically spaced friction means engaging ledges outstanding from each wall.

17. In a railway truck wherein a side frame is provided with a window opening and a bolster end is positioned within the opening, the combination of, columns in said side frame having portions extending inwardly of and outwardly from said window opening, said columns having intermediate webs between said portions and extending transversely of said truck beyond said portions, a top sprin plate within said opening arranged to move vertically and transversely of said side frame, friction means within and engaging said inwardly extending column portions and said top spring plate, means on said top spring plate for moving said friction means upwardly and downwardly, and hood means on said bolster overlying said friction means and inwardly extending column portions.

18. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported top plate within said opening and directly supporting said bolster, horizontal ledges outstanding from said top plate and extendin into said columns, shoes within said columns and movable upwardly and downwardly by said ledges, and diagonally disposed spring means urging said shoes transversely of said truck into frictional engagement with said columns.

19. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported top plate within said opening, said top plate normally contacting said bolster adjacent a transverse medial line only of said truck, shelves outstanding into said columns from said top plate above and below said bolster-top plate contact,

, 10 interlocked friction shoes within each column and being movable upwardly and downwardly by said shelves, and spring means disposed diagonally and urging said shoes into frictional engagement with said columns.

20. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported top plate within said opening, said top plate normally contacting said bolster adjacent a transverse medial line only of said truck, shelves outstandinginto said columns from said top plate above and below said bolster-top plate contact, said top plate being arranged to move vertically and transversely of said truck, outwardly exposed surfaces on said top plate adjacent said columns, interlocked friction shoes within each column and movable vertically by said shelves, spring means acting against said shoes for urging them into frictional engagement with said columns and top plate surfaces to snub all movements of said top plate, and means connecting said bolster and top plate thereby causing'said bolster and top plate to move vertically and horizontally in unison.

21. A railway truck comprising in combination with a side frame having columns defining a window opening with a bolster end positioned in said opening, a nest of springs carried by said side frame within said opening, a chair mounted on said nest of springs and having vertically spaced ledges extending into said columns, friction means .carried by said ledges and arranged to frictionally engage said columns and chair intermediate said ledges, contacting rocker surfaces on said bolster and chair, and interlocking teeth on said bolster and chair for preventing angular relative displacement between said bolster and chair.

22. In a bolster having an end arranged to extend into a window opening of a side frame, the combination of, a lower convex surface on said bolster end, racks arranged on an arc at each side of said convex surface, and hoods outstanding from sides of said bolster end.

23. In a bolster having an end arranged to extend into a window opening of a side frame, the combination of, a lower convex surface on said bolster end, sets of teeth arranged on an are at each side of said convex surface, one of said sets of teeth being formed separately and secured to said bolster end.

24. In a bolster having an end arranged to extend into a window opening of a side frame, the combination of, a lower convex surface on said bolster end, spaced sets of teeth arranged at sides of said convex surface, one of said sets of teeth being formed separately and secured to said bolster end.

25. In a bolster having an end arranged to extend into a window opening of a side frame,

' the combination of, a lower convex surface on tend into a window opening of a side frame, the

combination of,- a lower convex surface on said bolster end curved transversely of said bolster, means operatively related to and extending downwardly from said bolster end adjacent said convex surface; said means being formed separately and secured to said bolster, and hoods outstanding from side walls of said bolster end.

27. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having vertically spaced flanges extending into said columns, friction means movable vertically by said chair flanges for frictionally engaging said columns, contacting arcuate surfaces of different radii on said bolster and chair for allowing said chair to rock longitudinally of said truck beneath said bolster, and means on said bolster and chair adjacent said arcuate surfaces for maintaining a predetermined relationship between said contacting arcuate surfaces.

28. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having vertically spaced flanges extending into said columns, friction means movable vertically by said chair flanges for frictionally engaging said columns, contacting arcuate surfaces of different radii on said bolster and chair for allowing said chair to rock longitudinally of said truck beneath said bolster, and curved intermeshing teeth on said bolster and chair adjacent said arcuate sur faces for preventing said arcuate surfaces from angling horizontally relative to one another.

29. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having vertically spaced flanges extending into said columns, friction means movable vertically by said chair flanges for frictionally engaging said columns, contacting arcuate surfaces of different radii on said bolster and chair for allowing said chair to rock longitudinally of said truck beneath said bolster, and curved intermeshing teeth on said bolster and chair adjacent said arcuate surfaces; some of said teeth on said bolster being formed separately and secured to said bolster.

30. In a railway truck wherein a side frame is provided with a window opening defined by columns and a bolster end is positioned within the opening, the combination of, a spring supported chair within said opening and having vertically spaced flanges extending into said columns, friction means movable vertically by said chair flanges for frictionally engaging said columns, contacting arcuate surfaces of different radii on said bolster and chair for allowing said chair to rock longitudinally of said truck beneath said bolster, intermeshing means on said bolster and chair for preventing said arcuate surfaces from angling horizontally relative to one another, and hoods outstanding from said bolster covering said friction means.

31. In a railway truck wherein a side frame has a window opening, the combination of a bolster member in said opening, a chair member supporting said bolster member, an arcuate surface on one of said members and contacting said other member for allowing said chair member to rock relatively longitudinally of said side frame, and extending between said members adjacent said surface for maintaining predetermined rocking contact therebetween.

DONALD S. BARROW S.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 778,739 Buhoup Dec. 27, 1904 809,595 I-Iopkin Jan. 9, 1905 1,141,436 Turner June 1, 1915 1,749,959 Barrows -1 Dec. 17, 1929 1,910,992 Hedgcock M May 23, 1933 2,963,739 Hedgcock et a1. 1 Dec. 8, 193? 2,125,275 Goodwin Aug. 2, 1938 2,277,263 Tucker Mar. 24, 1942 2,282,166 Cottrell May 5, 1942 2,295,557 Cottrell Sept. 15, 1942 2,347,463 Couch Apr. 25, 1944 2,375,207 Cottrell May 8, 1945 2,378,229 Light June 12, 1945

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