US2444009A

US2444009A - Ride control truck

Info

Publication number: US2444009A
Application number: US535622A
Authority: US
Inventors: Chester E Grigsby
Original assignee: American Steel Foundries
Current assignee: American Steel Foundries
Priority date: 1944-05-15
Filing date: 1944-05-15
Publication date: 1948-06-22
Anticipated expiration: 1965-06-22

Description

June 22, 1948- c. E. smssav RIDE CONTROL TRUCK 4 Sheets-Sheet 1 Filed Kay 15, 1944 June 22, 1948. c. E. GRIGSBY RIDE CONTROL TRUCK 4 Sheets-Sheet 2 Filed May 15, 1944 NE QB Om QM Nv d mN June 22, 1948. c. E. GRIGSBY RIDE comnoz'. 'mucx 4 Sheets-Sheet 3 Filed May 15, 1944 jga g m-4Q 1 it Patented June22,

Chester maul-by.

, to American Steel corporation of New Washington, D. 0.. assimor Foundries, Jersey Chicago, 111., a

Application May 15, 1944, Serial No. 535,022 42 Claims. I (or. 105-197) My invention relates to railway car trucks and more particularly to a snubbed truck wherein means is provided for dampening oscillations of the bolster supporting springs.

The general object of my invention is to design a truck such as above-described, wherein a truss type side frame is provided, having a vertical center post or column received between spaced legs of a, bifurcated bolster end which is resiliently supported from the frame, said legs carrying friction means for engagement with the column.

In one modification of my novel snubbed truck, a friction device is mounted in the bolster for engagement with the inboard side of the center post, and in another modification, the bolster legs are rovided with wing portions carrying friction means for engagement with friction surfaces mounted on-the side frame adjacent the extremities thereof.

A different object of my invention is to design a novel quick wheel chang'e truck wherein the bifurcated bolster end is with gibs for abutment with the outboard edge of the center post to afford an interlock therewith,

said center post being relieved at its upper ex-v tremity, whereby the bolster may be elevated in the side frame bolster opening and removed therefrom along with the associated friction means while the bolster supporting springs remain in normal assembled relationship with the side frame.

My invention comprehends a bolster of novel form having a bifurcated end portion with spaced legs comprising friction, shoe pockets in the adjacent sides thereof for devices cooperating with the side frame center post in the manner above-described.

In the drawings, 1 Figure 1 is a, fragmentary composite view of provided on its spaced legs;

"-44 of Figure 12.

8 to 14, Figure 15 from the bolster engaging face of the shoe, Figure being a top plan view of the shoe, Figure 6 being a side elevation thereof and Figure 7 being a rear elevation taken from the left as seen in Figure 6.

Figures 8 through elevation of the truck, only one end thereof being illustrated inasmuch as it is symmetrical about its transverse center line. Figure 9 is a sectional view taken in the planes indicated by the line 9-4 of Figure 8, Figure 10 is a sectional view taken in the transverse vertical [plane indicated by the line I0'-l0 of Figure 8, view taken in the l|-Il of Figure 9. 1

Figures 12 vto 14 inclusive illustrate the novel bolster shown in Figures 8 through 11, Figure 12 being a fragmentary top'plan view illustrating one side only of the bolster, inasmuchas it is symmetrical about its 13 is a fragmentary side elevation taken from the .left as seen in Figure 12, and Figure 14 is a sectional view taken on the longitudinal vertical plane bisecting the bolster, as indicated by the line Figures 15 to 1'? inclusive illustrate in detail one of the identical the wing portions of the bolster shown in Figures being an elevational view taken 16 being a top plan view thereof, and Figure 17 i being a sectional view taken in the plane indicated the reception of friction I spaced

columns openings

8, 8 and an intermediate bolster opena railway car truck embodying-my invention, the

left half thereof being a side elevation and the right half thereof, being a sectional view. taken in the longitudinal vertical plane indicated by the line l-"I of Figure 2.

Figure 2 is a top view of the structureillustrated in Figure 1 with the side frame shown insection through the columns thereof.

Figure 3 is a sectional view taken inthe plane indicated by the line .3-3 of Figure 2.

Figure 4 is a sectional viewof the bolster illustrated in Figures 1 to 3, taken in the longitudinal vertical plane bisecting said bolster.

Figures 5 to 7 inclusive illustrate in detail the friction shoe shown in Figures 1 to 3, Figure 5 by the line l'l-'-i 'i of Figure 15.

Describing my invention in detail andreferring first to the embodiment thereof illustrati'iin Figures 1 to 7 inclusive, the side frame comprises a tension member 2,a

compression member

4 and 6, 6 defining'therewith window ing l0. I

The tension member 2 isof box-section beneath the bolster opening-with thetop chord l2 thereof widened and formed with upstanding inboard and outboard flanges i4 and i6 defining aspring seat i 8 on which are mounted the bolster'supporting coil springs diagrammatically indicated at 20, 20,

said springs being arranged in two pairs, dis-t posed'at opposite sides of the transverse center line of the truck, as will be clearly apparent from p h a consideration of Figure 2.

A center post 22 of box-section, as best seen in Figure 2, extends between the tension and com- I pression members and is cored away as at 24, 24

being offset or to lighten the structure. said post opposite sides relieved at the upper extremity at and Figure 11 is a sectional planes indicated by the line longitudinal center line. Figure friction shoes associated with form comprising the top and

bottom walls

38 and 32 and the spaced

side walls

34, 34, as well as the vertical longitudinal rib 38 disposed substantially parallel to said side walls. The bolster 28 comprises a bifurcated end portion of novelform comprising the

spaced legs

38, 38 receiving therebetween the center .post or column 22, each of said legs comprising a, pocket 48 for the reception of a friction device, hereinafter described with particularity. Within the pocket 48, the leg 38 is formed with spaced

diagonal walls

42, 42, as best seen in Figure 4 and the right half of Figure 1, and the top wall of said leg is formed with a spring seat 43 in vertical alignment with the space between the

walls

42, 42.

A friction shoe generally designated 44 is received within each pocket 48, said shoe being a, skeletal structure of cup-like form,.comprising the front or main friction wall 46 in frictional engagement as at 48 with a wear plate.

or liner 58 secured in any convenient manner, as by welding, to the center post 22. The shoe 44 also comprises a bottom wall 48 affording a seat as at 5| (Figure 1) fora spring diagrammatically indicated at 52, the upper end of which bears against the spring seat 43 formed on the top wall of the bolster leg 38; and the shoe 44 also comprises the spaced wing portions or

ledges

54, 54 at opposite sides thereof presenting diagonal wedge surfaces 56, 58 for engagement as at 58 (Figure 1, right) with the

walls

42, 42 formed within the pocket 48. The rear wall 68 of the shoe 44 is offset to afford a loop at 82 for the reception of a tool, which may be inserted through an opening 84 in the bolster leg 38 to withdraw the shoe 44 from engagement with the center post or column 22 during assembly 'and disassembly of the bolster and side frame, as hereinafter described.

It may be noted that the side wall of the leg 38, which forms the rear wall of the pocket 48, is provided with an opening 68 for the accommo- '4 shoe against the resistance of the spring 14 to the inner extremity of the pocket, with the offset portion 82 cf the shoe received within a complementary offset portion 82 in the rear wall 84 0f the pocket 88. It will be understood that with the shoe maintained in this retracted position the bolster and side frame may be readily assembled and disassembled.

The

legs

38, 38 of the bolster end portion are providedon their adjacent sides with opposed lugs or

gibs

88, 88 for cooperation with the outboard side of the center post 22 to afford a tie or interlock between the bolster and the side frame, and it will be clearly understood from a consideration of the left half of'Figure 1 that the depth of each gib 86 is substantially less than the depth of the offset portion 28 in thecenter post 22, whereby, when the

shoes

44, 44 are in their retracted positions, as above described, the bolster may be elevated in the bolster opening and removed therefrom along with the friction shoes during a quick wheel change, while the

springs

28, 28 remain in normal assembled relationship with the side frame.

Thus it will be understood that I have designed a novel snubbed truck, wherein the truss type side frame is provided with an upstanding column or center post received between the spaced legs of a bifurcated bolster end portion, which is resiliently mounted on the side frame tension member, friction shoes and associated actuating springs being housed in said legs for the development of friction against the center post during relative vertical movement between the bolster and the side frame.

In the embodiment above-described, additional friction is developed against the inboard side of the column or center post by means of a third friction shoe housed within an additional pocket formed in the bolster end portion at the juncture thereof with the main or body portion of the dation of the offset portion82 of the friction 1 shoe when urged to its extreme inner position with respect to the pocket 48, during assembly and disassembly of the bolster.

The end portion of the bolster is also provided inboardly of the

pockets

48, 48 with a pocket 88 of substantially identical construction with a dicomplementary wedge engagement as at 12 with a friction shoe 44, substantially identical with those friction shoes heretofore described.

A spring diagrammatically indicated at I4 is seated at its upper extremity against the top wall of the bolster and is seated at its lower extrem- .agonal wall or ledge 18 at eachside thereof in ity as at 16 against the bottom wall of the friction shoe, said spring being operable to urge the associated shoe downwardly along the ledges I8, 18 into frictional engagement at 15 with the wear plate .11, mounted in any convenient manner, as I commodation of a tool, which may be inserted through the

openings

88, 88 in the

side walls

34, 34 of the bolster for the purpose of urging the diagonal bolster walls I 28, 128 formed within bolster.

Figures 8 through 1'7 illustrate a modification of my invention wherein the side frame comprises the tension and compression members I82 and I84 and the vertical column I88 extending therebetween to define a bolster opening I88. The tension member I82 is substantially identical with that described in the previous embodiment with the top chord 8 thereof widened and formed with the upstanding inboard and outboard flanges II2,"II2, defining a spring seat upon which are mounted the bolster supporting springs diagrammatically indicated at H4, H4. 7

The bolster generally designated H6 is somewhat simllar to that described for the previous embodiment, comprising a body portion with the top and bottom walls I I8 and I28 merging at each side of the-bolster with a side wall I22. The end portion of the bolster is of bifurcated form, with a leg I24 at each side thereof, the.bolster legs receiving therebetween the column or center post I86. A pocket I26 is formed within each leg I24 with spaced diagonal walls or ledges I28, I28 at opposite sides thereof; and a friction shoe I38,

generally similar to the form of the shoes described for the previous embodiment, is received within the pocket I28, said slide having wing portions I32, I32at opposite sides thereof in complementary wedge engagementas at I34 with the the pocket I28.

A spring diagrammatically indicated at I38 is seated at its upper end as at I38 against the top wall of the pocket I28, said spring being seated at its lower endas at I38 against the bottom wall of the friction'shoe I30. It will be understood that, as in the previously described emmanner, as by welding, to the side of, the column or center post I08. The shoe is provided with a perforated lug I44 on the rear wall thereof. extending through the slot I48 formed in the side wall of the bolster leg I24, said side wall defining the rear extremity of the pocket I28. It will be understood that a tool may be inserted through the perforation in the leg I24, whereby the shoe I 80 may be urged to. its extreme inner position within the pocket I26 against the resistance of the compressed spring I 38 during assembly and disassembiy of the side frame and'bolster.

Each leg I28 of the bolster is provided with a wing portion I48 housing a friction device for cross section, as best seen in Figure 10, and pre-' sents the converging wedge surfaces I58, I58 in cooperation with inboard and outboard friction 6 I reinforcing. the structure, said wall I84 being slotted at I88 to permit inspection of the shoes I80, I60 and the spring I 84.

It is to be understood that I do not wish to be limited by the exact embodiments of the device shown which are merely by way of illustration and not limitation as various andother forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extending therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, wing portions on the remote sides of respective legs, and a friction device housed in each wing portion comprising spaced shoes in wedge engagement therewith, each of said shoes being frictionally engaged with africtions'urface on said frame, resilient means comcomplementary wedge engagement with the V spaced friction shoes I60, I 60, each of which is in frictional engagement at I62 with the associated panel I50. 0 y

A spring diagrammatically indicated'at I64 is seated at its lower extremity as at I66 against the bottom wall I68 of the wing portion I48, the upper extremity of said spring I64 bearing against the friction shoes I80, I80 for urging the latter into engagement with the wedge surfaces I58, I58 and with the panels I50, I50.

One of the friction shoes I60 is illustrated in detail in Figures 15 through 17, wherein it will be seen that said shoe is provided on its topwith a diagonal wedge face "0 for complementary engagement' at I58 with the top wall I56 of the wing portion I 48, as above described. The front face of the shoe I60 is provided with a friction surface I12 for frictional engagement with the associated panel I50, and on its rear face the shoe is formed with an arcuaterecess I14 for the accommodation of the beforementioned spring I64. The wedge surface "0 is interrupted by an opening "6 in the top of the shoe for the reception of a retainer pin or other suitable means, which may be inserted through a corresponding opening "8 (Figures 10 and 11) in the wall I56 for the purpose of retracting the shoes inwardly with respect to the wing portion I48 against the reslstance of the spring I64 and maintaining the shoes I80, I80 and the wing portion I48 in an assembled relationship for assembly and disassembly as a unit.

It may be noted that the top wall I58 of the site sides of said column, and friction means compressed between said shoes and an abutment surface on said wing portion, and friction means housed in each leg in frictional engagement with said column, said friction means comprising a pocket in said leg, a wedge. surface formed on said leg within said pocket, ,afriction shoe engaging said wedge surface and frictionally engaging said column, and resilient means under compression between said shoe and an abutment surface formed on said leg within said pocket.

2. In a railway car truck, a side frame comprising spaced columns partly defining spaced windows and an intermediate bolster opening, a

substantially vertical center post on said frame in said opening, springs seated on said frame at oppos'itesides of said center post, a bolster with a bifurcated end supported on said springs and having spaced legs embracing said center post, and friction means associated with each leg and comprising a pocket therein, spaced wedge surfaces formed on said leg in said pocket, said surfaces sloping toward said center post, a friction shoe engaging said surfaces and said center post, and resilient meansextending between said surfaces and. compressed against abutment surfaces on said leg and said shoe.

3. In a railway car truck, a truss side frame comprising tension and compression members and a substantially vertical column extending therebetween at the transversecenter line of said frame, a group of springs seated on said tension member, a bifurcated bolster end supported on said springs and comprising spaced legs at oppoprising a pocket in each leg with a wedge surface wing portion I48 is formed with a reinforcing gusset I80 merging with the side wall of the bolster leg. I24, and likewise, the lower surface of the top wall I56 is formedat each side thereof with a depending web I82 merging with the side wall of the bolster leg for the purpose of reinforcing the connection between the wing portion I48 and the bolster leg. The end of the wing.

portion I48 remote from the bolster leg I24 is formed with an end wall I84 for the pu se of therein sloping toward said column, a friction shoe in complementary wedge engagement with said surface and in frictional engagement with a surface on said column extending transversely of said frame, and a substantially vertical spring within said pocket compressed against said shoe and against an abutment surface on said leg.

4. In a railway car truck, a truss side frame comprising tension and compression members and a substantially vertical column extending.

therebetween, a spring group on said tension member, a bolster supported on said group and comprising a bifurcated end portion with spaced legs at opposite sides of said column, and friction means comprising a pocket in each leg with wedge means therein sloping toward said column,

" a friction-element in complementary wedge enasssooc gagement with said wedge means and in frictional engagement with a surface on said column extendingi transversely of said frame, and a substantially vertical spring within said pocket compressed against said element and against an abutmentsurface within said pocket formed on the top wall thereof.

5. In a railway car truck, a side frame of truss type comprising tension-and compression members and a substantially verticalcolumn extending therebetween, a bifuncated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, wing portions on the remote sides of respective legs, and a friction device housed in each wing portion comprising spaced shoes in wedge engagement therewith, each of said .shoes being frictionally engaged with a friction surface on said frame, resilient means compressed between said shoes and an abutment surface on said wing portion, and friction means housed in each leg in frictional engagement with said column.

6; In a railway car truck, a side frame comprising spaced columns partly defining spaced windows and an intermediate bolster opening, a substantially vertical center post on said frame in said opening, springs seated on said frame at opposite sides of said center post, a bolster with a bifurcated end supported on said springs and having spaced legs embracing said center post, and friction devices housed in the adjacent sides of said legs in frictional engagement with said center post, each of said devices comprising wedge means on the associated leg, a friction. shoe engaging said wedge means and frictionally engaging said centerpost and a. spring bearing against said leg and said shoe.

7. In a railway cartruck, tensionand compression members and three spaced columns extending therebetween, resilient means on said tension member, and a bolster having a bifurcated end supported on said resilient means and comprising spaced legs receiving therebetween the intermediate of said columns, and friction means associ-' ated with each leg comprising a pocket therein, spaced diagonal walls formed on said leg within said pocket, a friction shoe engaging said diagonal walls and said intermediate column, and a vertical spring extending between said diagonal walls and compressed against abutment surfaces on device housed in each wing portion comprising spaced shoes in wedge engagement therewith, each of said shoes being frictionally engaged with a friction surface on said frame, and a resilient memberhoused within both of said shoes and compressed between said shoes and an abutment surface on said wing portion.

9. In a railway car truck, a side frame having tension and compression members defining a bolster opening and a substantially vertical column extending between said'members, a bifurcated bolster end resiliently supported by said tension member and comprising spaced legs receiving said column therebetween, and friction means housed in each leg in frictional engagement with opposite sides of said column, said legs having gibs on their adjacent faces outboard said column for cooperation therewith to afford an interlock between said bolster and said frame, said column being offset at opposite sides thereof for a greater depth than that of said. gibs, whereby said bolster may be elevated in said bolster opening and removed from the top thereof during a quick wheel change. I

10. In a railway car truck, tension and compression members and three spaced columns extending t'herebetween, resilient means on said tension member, and a bolster having a bifurcated end supported on said resilient means and comprising spaced legs receiving therebetween the intermediate of said columns, andfriction means housed in each leg comprising a, friction element in wedge engagement therewith and in frictional engagement with said intermediate column, and substantially vertical resilient means under compresslon between abutment means on said leg and said element.

11. In a railway car truck, a side frame of truss type comprising a substantially vertical column, a bifurcated bolster end resiliently supported on said frame and comprising spaced legs at opposite sides of said column, and friction means comprising a pocket in each leg with spaced wedge surfaces therein sloping toward said column, a friction shoe. engaging said spaced wedge surfaces and frictionally engaging said column, and a substantially vertical spring extending between said spaced wedge surfaces and bearing against said shoe and an abutment surface formed on said leg within said pocket.

12. In a railway car truck, a side frame comprising spaced columns partly defining spaced windows and an intermediate bolster opening, a substantially vertical center post on said frame in said opening, springs seated on said frame at opposite sides of said center post, a bolster with a bifurcated end supported on said springs and having spaced legs embracing said center post, and friction devices housed in the adjacent sides of said legs in frictional engagement with said center post.

13. In a railway car truck, a side frame of truss type comprising a substantially vertical column, a bifurcated bolster end resiliently supported on said frame and comprising spaced legs at opposite sides of said column, and a friction device housed in each leg comprising a friction shoe in wedge engagement therewith and in frictional engagement with said column, and resilient means compressed between said shoe and an abutment surface on said leg.

14. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extending therebetween, a bifurcated bolster struc ture comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, cooperating friction means carried by said legs and the adjacent sides of said column, wing portions on the remote sides of respective legs, a friction device ca'rriedby each wing portion for cooperation with inboard and outboard friction surfaces on said frame, each of said devices comprising spaced friction shoes in wedge engagement with the associated wing portion, and resilient means operatively associated with said shoes.

15. In a railway car truck. tension and comof said frame.

17. In a railway car truck? a side frame of truss i a, ,ooe

tending therebetween. resilient means onsaid tension member, and a bolster having a bifurtruss type comprising a substantially vertical column, a bifurcated bolster end resiliently supported on said frame and comprising spaced legs at opposite sides of said column, and friction devices housed in said legs and cooperating with friction surfaces on said column xtending transversely type comprising a substantially vertical column. a bifurcated bolster end resiliently supported on said frameand comprising spaced legs at opposite sides of said column, and friction means car- I said tension member ried by said legs for engagement with said column.

18. In a bolster for a railway car truck, a boxsection member with a bifurcated end portion comprising spaced legsand friction shoe pockets in the adjacent sides of said legs. each of said pockets comprising a wedge surface therein-and a spring seat vertically spaced with respect to said surface.

19. In a railway car truck, a side frame comprising a substantially vertical column, a bifurcated bolster e'nd resiliently supported on said frame and comprising spaced legs at opposite sides of said column, friction means carried by said legs'in frictional engagement with the sides of said column extending transversely of said frame, and friction means carried by the body of said bolster at the juncture of said legs therewith in engagement with the inboard side of said col-E umn. I

20. In a bolster for a railway car truck, a boxsection member with a bifurcated end portion comprising spaced legs and wedge surfaces formed on the adjacent sides of said legs sloping toward the longitudinal center line of the bolster.

21. In a railway car truck, a side frame of truss type, comprising tension and compression members and a substantially vertical column extending therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, friction means carried by said legs in frictional engagement with oppomote sides of respective legs, and friction means carried by each wing portion in engagement with a friction surface on said frame.

22. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extendsite sides of said column, wing portions on the reing therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, friction means carried by said legs in frictional engagement with opposite .sides of said column, wing portions on the remote sides of respective legs, and friction means carried by each wing portion for cooperation with inboard and outboard friction surfaces on said frame.

23. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extending therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from sides of respective ported on said 10 and disposed at opposite sides of said column, friction meansjcarried by said legs-in frictional engagement with opposite sides of said column, wing portions on the remote legs, and a friction device housed in each wing portion comprising spaced shoes in wedge engagement with the associated wing portion and in frictional engagement with inboard and outboard friction surfaces on said frame, and resilient means operatively urging said shoes into said engagement.

24, In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extending therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, friction means carried by said legs inv frictional engagement with opposite sides of said column, wing portions on the remote sides of respective legs, each comprising spaced horizontal walls, friction shoes in wedge engagement with one of said-walls and in frictional engagement with friction surfaces on said frame, and resilient means compressed between said shoes and the other of said walls.

25. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extend ing therebetween, a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, friction means carried by said legs in frictional engagement with opposite sides ofsaid column, wing portions on the remote sides of respective legs, each comprising top and bottom walls, friction shoes in wedge engagement with said top wall and in frictional en gagement with friction surfaces on said frame, and resilient means compressed between saidshoes and said bottom wall.

.26.. In ra railway car tnickfa side frame of truss type comprising tension and compression members and a single vertical column extending therebetween at theniidpoints of said members, a bifurcated one-piece bolster end resiliently suptension member and comprising spaced legs receiving said column therebetween, integral wing portions on the remotesides of respective legs, and a friction device housedjinreach wing portion comprising spaced shoes. in wedge engagement therewith, each of said shoes being in frictional engagement with a friction surface on said frame, and a substantially vertical spring housed within both of said shoes and compressed between said shoes and an abutment surface on said wing portion.

27. In a railway car truck, a side frame comprising top and bottom members and a sole substantially vertical column extending therebetween at the midpoints thereof, a bifurcated bolster end resiliently supported on said bottom member and comprising spaced legs receiving said column therebetween, wing portions on the remote sides of respective legs each of said wing portions comprising top and bottom walls, spaced friction shoes housed in each wing portion, resilient means as-- sociated with'said shoes and operative to urge said shoes into wedge engagement with the top wall of the associated wing portion and into frictional engagementwith friction surfaces on said frame, and lugs on the adjacent sides of said legs overlapping the outboard side of said column for interlocking said bolster end with said column.

28. In a railway car truck, a side frame comprising-.a substantially vertical column. a bifurcated bolster end supported on said frame and comprising spaced legs receiving said column therebetween, and friction means carried by at least one of said legs and the body of said bolstar at the juncture of said legs therewith in frictherebetween, and friction shoes housed in said legs and the body of said bolster at the juncture of said legs therewith in frictional engagement with the adjacent sides of said column, and resilient means compressed between each shoe and an abutment surface on said bolster. I

30. In a railway car truck. a side frame comprising a substantially vertical column, a bifurcated bolster end supported on'said frame and comprising spaced legs receiving said column therebetween, a pocket in each of said legs and the body of said bolster at the juncture of said legs therewith, each pocket having a wedge surface sloping toward said column, a friction shoe in each pocket in wedge engagement with said surface and in frictional engagement withthe adjacent side of said column, and resilient means associated with said shoe and operatively urging the same into said engagement.

31. In a railway car truck, spaced side frames each comprising a substantially vertical column, a bolster extending between said frames and comprising bifurcated end portions supported on said frames, each of said end portions comprising spaced legs receiving the adjacent column therebetween, and friction means in the body of said bolster at the juncture of said legs therewith in frictional engagement with the inboard side of the associated column for resisting vertical and transverse movement of said bolster with respect to said frames.

32. Inarailway car truck, spaced side frames each comprising a substantially vertical column, a bolster extending between said frames and comprising bifurcated end portions supported on said frames, each of said end portions comprising spaced legs receiving the adjacent column therebetween, and a friction shoe housed in the body of said bolster at the juncture of said legs therewith, said shoe having wedge engagement with said bolster body and frictional engagement with the inboard side of the associated column, and resilient means compressed between said shoe and said bolster.

33. In a railway car truck, a side frame of truss type comprising tension and compression members and a substantially vertical column extending therebetween', a bifurcated bolster structure comprising spaced legs resiliently supported from said tension member and disposed at opposite sides of said column, wing portions on the remote sides of respective legs, friction means carried by each wing portion for cooperation with a friction surface on said frame, and cooperating friction means carried by said legs and the ad'- jacentsides of said column.

34. In a railway car truck, a sideframe having top and bottom members, a central column therebetween, vertically aligned ledges on'said top and bottom members at opposite sides of said column in part defining bolster openings with said column and members at opposite sides of said column, a bolster having laterally spaced mm received within the respective openings and supported from said frame, cooperating friction means carried by each of said ends and said column, inboard and outboard friction panels mounted on each set of ledges. a wing portion on each end extending between the adjacent set of friction panels, and a friction device housed in each wing portion comprising spaced shoes in wedge engagement therewith and in frictional engage ment with respective adjacent panels.

35. In a railway car truck, a truss side frame with tension and compression members and a vertical central column defining openings at opposite sides thereofja bolster end spring-supported on said frame with bifurcated portions in respective openings, vertically aligned ledges on said members at opposite sides of said column, inboard and outboard friction panels supported on respective sets of ledges, an integral wing on each'bifurca'ted portion with friction means engaging respective panels of the adjacent set, each of said bifurcated portions resiliently supporting a friction. element engaging said column.

36. In a railway car truck, a truss type side frame comprising a substantially vertical central column, a relatively movable member resiliently supported on said frame and comprising spaced legs at opposite sides of said column, and friction means carried by said respective legs inengagement with friction means carried in opposite sides of said column.

37. In a railway car truck, a truss type side frame comprising a substantially vertical central column in part defining windows at opposite sides thereof, a relatively movable integral member resiliently supported on said frame and comprising spaced legs at opposite sides of said column, and friction means carried by at least one of said legs in engagement with friction means carried by the adjacent side of said column, said. column having a relatively narrow upper portion and said legs having, adjacent outboard bolster. guide lugs adapted to be received within the upper portions of said windows at said upper portion of said col- 38. In a bolster for a railway car truck, a boxsection member with a bifurcated end portion comprising spaced legs and friction shoe pockets in the adjacent sides of said legs, each of said surface, wing portions on the remote sides of respective legs, and friction shoe pockets in each of said wing portions.

39. In a bolster for a railway car truck, a boxsection member with a bifurcated end portion comprising spaced legs and friction shoe pockets in the adjacent sides of said legs, wing portions on, the remote sides of respective legs, and friction shoe pockets in each of said wing portions.

40. In a bolster for a railway car truck, a onepiece box-section member with an end portion comprising wings on opposite sides thereof and frictior shoe pockets in each of said wings, each of said pockets comprising a V-shaped top wall having wedge surfaces and a bottomwall having a spring. seat vertically aligned with respect to said surfaces.

41. In a bolster for a railway car truck, a boxsection member with a bifurcated end portion comprising spaced legs and friction shoe pockets in the adjacent sides of said legs, a friction shoe -in each pocket,'and resilient means'operatively associated with each shoe for urging the same outwardly of the associated pocket.

42. In a bolster for a railway car truck, a boxsection one-piece member with an end portion comprising integral wings at opposite sides thereof, each of said win'gs comprising spaced walls,

a friction shoe in wedge engagement with one of said. walls, resilient means compressedbetween said shoe and the other of said walls, said shoe and said one wall having openings for the reception of means for retracting said shoe within the associated wing portion in the assembly and disas-' sembly of said friction shoes and resilient means with said wing portions, an opening in said portion and friction shoe pockets in said portion at the sides of said opening.

CHESTER E. GRIGSBY.

REFERENCES CIT D Number UNITED STATES PATENTS Name Date Shallenberger Dec. 16, 1902 Bullock Mar. 2, 1915 Priebe May 5, 1925 Leppla 1 Mar. 3,1936 Couch May 17, 1938 Webb Aug. 15, 1939 Barrows Sept. 16, 1941 Davidson Sept. 30, 1941 Tucker Mar. 24, 1942 Cottrell Sept. 15, 1942 Endsley Sept. 14, 1943 Flesch Nov. 9, 1943 Couch Apr. 25, 1944 Couch May 9, 1944 Light June 12, 1945 Light June 19, 1945 Lehrman Jan. 8, 1946