US2485971A - Snubbed truck - Google Patents

Description

Oct. 25, 1949. o. M. LIGHT SNUBBED TRUCK 3 Sheets-Sheet 1 Filed Jan. 31, 1945 6 41.11 6 2 6 6 6 2 5 w w m llllllll ll l i IF I TIF FIfiI w i m l I- .FIIMI. O 6 Jam 7 3 1 11 INVENTOR.

Oct. 25, 1949.

D. M. LIGHT SNUBBED TRUCK 5 Sheets-Sheet 2 Filed Jan. 31, 1945 Oct. 25, 1949. Y D, |GHT 2,485,971

SNUBBED TRUCK Filed Jan. 31, 1945 3 Sheets-Sheet 3 120 126 I i 112 d 110 29 W K K/Z 4 44 w 116 4, 126 2 .10

C Z INVENTOR. I 1

Patented a 25, 1949,

SNUBBED TRUCK David M. Light, Chicago, Ill, assignor a American Steel Foundriee, Chicago, 111., a corporation of New Jersey Application January 31, 1945, Serial No. 575,388

18 Claims. (Ch 105-197) My invention relates to railway car trucks and more particularly to such trucks incorporating friction absorbing means for dampening oscillations of the spring-supported truck bolster.

An object of my invention is to design a truck as above described comprising friction means associated with the bolster and side frame columns for insuring substantially uniform constant fricbolster-supporting spring group are effectively snubbed during operation of the truck.

Another object of my invention is to design a railway car truck such as described wherein friction shoes may be housed in each side of the bolster, each shoe being in frictional engagement with a friction surface on an adjacent side frame column and in slidable engagement with a surface in said pocket and having resilient means associated therewith for urging the same, against said surfaces; Y

My invention comprehends a friction shoe of novel form, said shoe being of cuplike form for housing associated resilient means and having a horizontal wedge surface on one wall thereof and a friction face on a wall at one end thereof and spaced lugs having aligned openings at the other end thereof.

In the drawings:

Figure l is a fragmentary side elevation of a railway car truck embodying my invention, the view being shown partly in section in order more clearly to illustrate the arrangement of the friction parts, said section being taken in the longitudinal plane bisecting the truck indicated by the line l-l of Figure 2;

Figure 2 is a fragmentary top plan view of the car truck shown in Figure 1, partly in section, the view being taken approximately in the planes indicated by line 2-2 of Figure 1;

Figure 3 is a fragmentary side elevation, taken from the left and looking into the shoe pocket of the bolster shown in Figures 1 and 2;

Figures 4 to 6, inclusive, show in detail my novel friction shoe, Figure 4 being a top plan view thereof, Figure 5 being a rear elevation taken from the right as seen in Figure 4, and Figure 6 being a side elevation taken from the bottom as seen in Figure 4;

Figures 7 to 10, inclusive, show a modification of my invention, Figure 7 being a fra mentary top plan view of the bolster, Figure 8 being a fragmentary sectional view of the bolster taken in the transverse vertical plane bisecting the bolster as indicated by the line 0-8 of Figure '7, Figure 9 .being a sectional view taken on the line tion therebetween whereby the oscillations of the 2 99 of Figure 7, and Figure 10 being a sectional view taken on the line Ill-l0 of Figure '1;

Figures 11 and 12 illustrate another modifica tion of my invention, Figure 11 being a fragmentary top plan view of the bolster and Figure 12 being a sectional view taken in the transverse vertical plane bisecting the bolster as indicated by the line i2-l2 of Figure 11.

Describing my invention in detail and referring first to the modification shown in Figures 1 to 6,

inclusive, the truck comprises a side frame of conventional type comprising the tension and compression members 2 and 4 and a column 8 merging therewith to define a bolster opening I! with a widened upper portion indicated at II. A plurality of springs, diagrammatically indicated at l3, l3, are seated on' the tension member 2 in the customary manner and afford support for a bolster generally designated ll.

'I'he bolster structure, 'as may be clearly seen from a consideration of Figures 1 to 3, inclusive. comprises the bolster of box section having the top and bottom walls I and i8 merging at each side of the bolster with a side wall 20 and formed with inboard and outboard interlocking gibs 22' and 24 for cooperation with the column 8 to afford an interlock between the side frame and bolster. It will be readily understood by a comparison of Figures 1 and 3 that the outboard gib 24 is of less depth than the widened upper portion I! of the bolster opening so that the bolster may be elevated therein and removed therefrom during a quick wheel change as hereinafter more fully described.

At each side thereof the bolster is formed with a friction shoe pocket 26 comprising the inboard and outboard walls 28 and 30 and the rear wall. 32, said walls merging with the top and bottom bolster walls I 8 and i8 to define said pocket. Within each pocket 26 may be mounted a friction shoe in engagement with the horizontal V-shaped wedge surface 3| of thetop wall It as indicated I at 36 in Figure l.

The friction shoe, generally designated 38, .is illustrated in detail in Figures 4 to 6 wherein it will be seen that the shoe is a casting of generally cuplike structure comprising the front wall 40,

the top wall 42 and the spaced side walls 44, It,

said front wall 40 having a vertical friction face 48 in frictional engagement as at 50 with a wear plate 52 mounted in any convenient manner as by welding 0n the adjacent column 8, and said top wall being formed with the horizontally disposed angularly arranged surfaces 5| and 5G inengagement as aforesaid with the v-shaped wedge surface 34 on the top wall It of the bolster pocket.

Referring now to Figure 1, within each friction shoe 36 may be housed a resilient rubber block 68 under com ression between the walls thereof and the bolster bottom and rear walls I 8 and 32, said block having secured thereto, as by vulcanizing, a spring seat member or plate 60 in abutment with the front wall 40 of said shoe and slidably enga ing the bolster bottom wall I6, said plate being in spaced relation to the side walls 44. 40 of said shoe and movable with said shoe laterally of said bolster. It will be apparent that the resiliencv of the rubber block 68 will provide a direct force path between the bottom bolster wall I8 and the top wall 02 of the shoe whereby the latter will be constantly urged upwardly and maintained at all times in engagement with the wed e surface 34 on the bolster top wall I6 and, at the same time, a direct force path will be afforded between the rear wall 32 of the pocket and the front wall 40 ofthe shoe whereby said shoe will be constantly urged along the wedge surface 34 toward the adjacent column 6 while the spring plate in abutment with the shoe will move along the bottom wall I8 of the bolster pocket toward the adjacent column 8, with the result that the shoe will be maintained in constant and uniform frictional engagement with the wear plate 52 on the adjacent column 8. It may be noted from a consideration of Figure 1 that the block 58 is formed substantially round in contour so that some clearance will be afforded as at 6| for the distortable rubber block under conditions of maximum distortion or flow of the resilient material during compression of the same during inward movement of the associated shoe as the bolster moves toward the adjacent column.

As shown in Figure 1, the wedge surface 34 of I the bolster top wall the bolster top wall I6, in engagement with the top wall 42 of the shoe, is slightly crowned to permit a rocking movement of the shoe thereon in order to accommodate some tilting movement of the side frame with respect to the bolster while maintaining the friction wall 40 of the shoe in full face engagement with the wear plate 52 of the adjacent column. It may be noted that the engagement of the horizontally disposed V- shaped wedge surfaces on the bolster and shoe top walls I6 and 42, respectively, will effectively restrict lateral movement of the shoe in the pocket 26.

The bolster may be readily assembled or disassembled from the associated side frames for quick wheel change purposes and, for-this purpose, the shoe 38 is formed with the side walls 44, 44 projecting rearwardly thereof and affording spaced parallel lugs 62 and 64 extending through openings 66 in the rear wall 32 of the pocket, said lugs having aligned openings 68 therein toaccommodate the reception of an associated tool engaging the rear-wall of the pocket whereby said shoes may be withdrawn from engagement with the wear plate 52 and, in the disassembly of the truck, the bolster may be elevated in the bolster opening I0 and removed from the widened upper portion I2 thereof while the supporting coil springs I3, I3 remain in normal assembled relationship with the side frame.

In the modification illustrated in Figures 7 to 10, inclusive, the side frame (not shown) is adapted to have associated therewith a bolster substantially the same as that of the modification previously described and comprising the top and bottom walls I02 and I04 merging at each side of the bolster with a side wall I06, and a pocket I08 is formed in each side of the bolster, each of said pockets being defined by said top and bottom walls I02 and I04, inboard and outboard walls III) and H2 and the rear wall Ill, the rear wall of each pocket being spaced from said top wall for a purpose to be hereinafter described.

As in the previous modification, the bolster top wall I 02 is formed with a V-shaped wedge surface II6 in complementary engagement with the top wall IIB of the friction shoe generally designated I20, said surface II6 being crowned similarly to that of the previous modification for a similar purpose. The shoe I20 has substantially the general form of the previous modification with the top wall II8 thereof maintained in engagement with the surface II6 by means of a flat horizontally disposed rigid member or bar I22 extending transversely of the bolster between I02 and the rear walls I ll of the pockets at opposite sides of the bolster and urged into engagement at each end thereof with the top wall IIO of the shoe in each pocket by a vertically disposed coil spring I24 disposed between said rear walls H4 and compressed between the central portion of said bar I22 and the bottom wall I04 of the bolster. The bar I22 is formed with the lntumed flanges I26 for confining the spring I 24 therebetween as may be clearly seen in Figure 9.

The friction shoe in each pocket also comprises the front wall I28 having frictional engagement with an adjacent column wear plate (not shown) under the force applied thereto by the horizontally disposed coil spring I 30 received between the spaced side walls I32, I32 of the shoe and compressed between the rear wall Ill of the associated pocket and the front wall I28 of the shoe.

It will be readily apparent to those skilled in the art that the coil spring I24, through the force applied by the same to the bar I 22, will cause the bar to urge the top wall of the shoe in each pocket intowedge engagement with the ad- -jacent wedge surface H6 and maintain the shoe in said engagement during movement of each shoe along said bolster top wall and outwardly of the bolster by the spring I30 whereby the friction shoe in each pocket will be maintained in substantially constant frictional engagement with the adjacent column.

As in the previous modification, each shoe is formed with the side walls I32, I32 extending rearwardly thereof to aflford lugs I 34, I 34 passing through openings in the rear wall of the associated pocket, said lugs having aligned openings I36, I36 for receiving a tool having engagement with the rear wall of the pocket whereby said shoe may be withdrawn into the associated pocket during assembly or disassembly of the bolster with the associated side frames.

Another modification of my invention is shown in Figures 11 and 12 and the side frame (not shown) is adapted to have associated therewith a bolster substantially identical with the bolster in the modification shown in Figures 1 to 8, said bolster comprising the top and bottom walls 202 and 204. A pocket 206 is formed ineach side of the bolster and comprises the top and bottom walls 202 and 204, the inboard and outboard walls H0 and 2I2 and the rear wall 2I4, said pocket housing a friction shoe generally designated 2l6.

The friction shoe 2" is substantially similar to that described in the previous modificat on and comprises the top wall 2|. seated against the top wall 2" of the bolster as ind cated at 222 and maintained in enga ement therewith by an expansible spring plate 222 of substantially C-section' housed within said shoe and under compression between the top wall 2|. of the shoe and the bottom wall 204 of the bolster.v

The shoe also comprises the sidewalls 224 receiving said spring plate 222 therebetween and the front wall 220 having a friction surface 228 on one side thereof for frictional engagement with an ad acent colmnn wear plate (not shown) said wall 220 having the opposite side thereof formed with a recess 2 receiving an arcuately formed portion 232 of the spring plate 222 for positioning said spring plate on said wall and spacing the vertical portions of the spring plate on opposite sides thereof therefrom to materially increase the resistance to compression of the same whereby said plate will maintain the associated shoe in engagement withthe top wall of the pocket during movement of the shoe laterally of said bolster.

Received between the spaced legs 2" and 238 of the spring plate 222 is a horizontally disposed coil spring 24' seated at one end thereof a ainst the vertical portions of the spring plate 222 and at the other end thereof against the rear wall 2 of said pocket. said rear wall having 8. lu 242 positioning said spring thereagainst. It will be apparent that the spring 240- will urge the shoe and the plate outwardly of the pocket by the force applied thereto by said spring, the

' leg 2" of the-spring plate 222 moving with said shoe during movement of the latter along the engaged surface of the top wall 202, and the leg 238 sliding along the engaged surface of the bottom wall 204 during said outward movement of said shoe.

Referring now to Figure 12, it will be noted that the top and bottom walls 202 and 204 of each pocket are provided with opposed crowned surfaces 244 and 246 engaged with the plane surfaces 24! and 250 on the top wall 2" of the associated shoe and the leg 238 of the associated spring plate 222, respectively, whereby said shoe and spring plate may rock on said surfaces 244 and 246 to accommodate some tilting movement of the bolster with respect to the side frame while maintaining the friction surface 228 of the front wall 226 in full bearing against an adjacent column (not shown).

As in the previous modifications, each shoe is provided with spaced lugs 252 projecting outwardly from the side walls 224 thereof and extending through slots in the rear wall 2" of the associated pocket, said lugs having aligned openings 254 for reception of a suitable tool bearing against said rear wall 2 for urging the shoe into said pocket during assembly and disassembly of the bolster with the associated side frames.

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 iilus-' tration and not limitation as various and other 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 having spaced columns, a bolster supported on said frame 6 with pockets adjacent columns, a friction shoe in each pocket having a substantially horizontal wedge surface in engagement with a complementary surface in said pocket, a substantially rigid member extending transversely of said bolster and having engagement with the shoe in each pocket, resilient means between said pockets and operatively engaging said member for urging the same with the associated shoes in a vertical direction, and resilient means housed in each shoe and compressed between a wall thereof and a spaced wall of said bolster for urging said shoe along the wedge surface of said pocket and against the adjacent column.

2. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster supported on said frame between said columns, a pocket in each side of said bolster comprising a horizontal wall having diagonally arranged faces presenting a wedge surface, a hollow friction shoe in each pocket, each of said shoes having a horizontal wall and a vertical wall, and resilient means operatively associated with the inner faces'of said walls of each shoe and reacting against said bolster for simultaneously urging said shoe vertically into engagement with said surface and laterally of said bolster into engagement with a friction surface on the adjacent column.

3. In a railway car truck, a side frame havin spaced columns defining in part a bolster opening, a bolster supported on said frame between said columns, a pocket in each side of said boister, a friction shoe in each pocket comprising a horizontal wall and a vertical wall in complementary engagement respectively with a substantially V-shaped wedge surfaceon said pocket and a friction surface on an adjacent column. and resilient means operatively associated with each of said walls for urging said shoes against said surfaces.

4. In a railway car truck, a side frame comprising spaced columns defining in part a bolster opening, a bolster supported on said frame in said opening, a pocket in each side of said bolster comprising spaced substantially horizontal walls and a wall projecting therebetween, a single member in each pocket comprising a friction shoe in slidable engagement with one of said horizontal walls and in frictional engagement with an adjacent column, and resilient means compressed between saidshoe and said other walls.

5. In a railway car truck, a side frame comprising spaced columns defining in part a bolster opening, a bolster supported on said frame in said opening, a pocket in each side of said bolster comprising spaced substantially horizontal walls and an angularly related wall therebetween, a

friction shoe in each pocket in engagement with one of said horizontal walls and an adjacent column, and resilient means exerting vertical and horizontal forces, said vertical forces acting between said shoe and the other of said horizontal walls and operatively urging said shoe into said engagement, said horizontal forces acting between said shoe and said angularly related wall and urging said shoe outwardly of said bolster and into frictional engagement with an adjacent column.

6. In a railway car truck, a side frame having a column with a friction surface, a bolster supported on said frame and having a pocket adjacent said surface, a friction shoe in said pocket and having engagement with a wall of said pocket and said friction surface, and a plurality .of re-- silient means housed in said shoe, one of said resilient means urging said shoe into engagement with said pocket wall and the other of said resilient means urging said shoe against said surface.

7. In a railway car truck, a side frame having spaced columns, a bolster supported on said frame with pockets adjacent said columns, a wedge surface in each pocket, a friction shoe having angularly arranged walls bearing respectively against said surface and against the adjacent column, and resilient means housed in said bolster and simultaneously exerting forces substantially perpendicular to each other and operatively associated with each of said' walls for urging said shoe into engagement with and along said surface.

8. In a railway car truck, a spaced columns with friction surfaces, a bolster supported on said frame and having at least one pocket adjacent one of said surfaces, said pocket being partially defined by a top wall, a friction shoe in said pocket in engagement with said top wall and an adjacent friction surface, and resilient means housed within said shoe and bearing against said shoe and angularly arranged walls in said pocket.

9. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster supported on said frame in said opening, a pocket in each side of said bolster, a friction shoe in each pocket in engagement with a wedge surface in said pocket and a friction surface on the adjacent column, and resilient means housed in said shoe and compressed between said shoe and angularly arranged walls of said pocket.

10. In a railway car truck, a side frame comprising spaced columns, a bolster supported on said frame between said columns, a pocket in at least one side of said bolster, a single member in said pocket comprising a friction shoe in wedge engagement with a substantially horizontal wall thereof and in frictional engagement with a friction surface on an adjacent column, and a resilient member associated with said shoe and simultaneously exerting forces substantially perpendicular to each other and operative to urge said shoe in a vertical and a horizontal direction.

11. In a railway car truck, a side frame comprising a column member, a relatively movable member supported column member, a pocket in one of said members housing friction means for engagement with the other-of said members, said friction means comprising a wedge surface in said pocket, a friction shoe in engagement with said surface, and a resilient member vertically and horizontally compressed between angularly arranged walls of said shoe and said pocket.

side frame having on said frame adjacent saidi 12. In a railway car truck, a side frame having spaced columns, a bolster supported on said frame between said columns and a pocket in each side of said bolster, friction shoes in each pocket in wedge engagement with a wall thereof and in frictional engagement with an adjacent column, and a plurality of resilient means housed in each shoe and respectively compressed between said shoe and angularly arranged walls of said bolster.

13. In a friction shoe for a railway car truck, a member comprising a horizontal wall having a wedge surface on one side thereof, a vertical wall having a friction surface on one side thereof, a spring seat on the opposite side of each wall, spaced parallel walls merging with said horizon- 8 tal and vertical walls, and lugs integral with said parallel walls and having aligned openings therein.

14. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster supported from said frame in said opening, a pocket in each side of said bolster comprising horizontal top and bottom walls, said top wall having angularly arranged faces diverging toward said bottom wall and affording a wedge surface, a friction shoe in each pocket in engagement with said surface and having a wall engaging a friction surface of the adjacent column, and resilient means housed within said bolster and associated with each shoe and operative to urge said shoe upwardly and laterally of said bolster, said faces being crowned to permit movement of said shoes with said columns upon vertical angling of said frame relative to said bolster.

15. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster supported from said frame in said opening, said bolster comprising top and bottom walls and vertical walls therebetween defining a pocket in each side of said bolster, diagonal faces on the top wall forming a wedge surface in each pocket, a friction shoe in each pocket in engagement with said surface, and resilient means associated with each shoe and exerting independent forces substantially perpendicular to each other, said forces reacting against said vertical walls and said bottom wall for urging said shoes upwardly into engagement with said surfaces and laterally of said bolster into engagement with friction surfaces on said columns.

16. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster supported from said frame in said opening and comprising spaced horizontal walls and substantially vertical walls therebetween and defining a pocket in each side of said bolster, one of said horizontal walls providing a wedge surface in each pocket, a friction shoe in each pocket in engagementwith said surface, and resilient means operatively associated with each shoe and reacting against said vertical walls and other of said horizontal walls for urgin said shoes into engagement with said surfaces and laterally of said bolster into engagement with friction surfaces on said columns, said resilient means being operative to move said shoes laterally of said bolster and simultaneously maintaining said engagement between said shoes and surfaces.

17. In a railway car truck, a side frame having spaced columns partly defining a bolster opening, a bolster end spring-supported on said frame in said opening, and friction means mounted in the end of said bolster for engagement with said columns, said friction means comprising friction shoes pocketed in said bolster end and in slidable engagement with a wall thereof, a resilient member operable to urge both of said shoes into engagement with said bolster wall, and resilient means compressed between'said shoes and operative to urge the same into engagement with the adjacent columns.

18. In a railway car truck, a side frame having spaced column partly defining a bolster opening, friction surfaces on said columns extending transversely 'of said frame, a bolster .springsupported on said frame in said opening and having pockets adjacent respective columns, friction shoes in said pockets, and a plurality of resilient means associated with said shoes, one of said re- REFERENCES CITED The following references are of record in the file of this patent: 10

UNITED STATES PATENTS silient means slidably supporting said shoes and other of said resilient means being associated gggg gf Oct 13 with said shoes for urging them into engagement 1 130665 Bullock 1915 with the adjacent surfaces. 5 2118o06 Couch 7"" 1938 DAVID M. LIGHT.

2,257,109 Davidson Sept. 30, 1941

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