US2449305A

US2449305A - Snubbed truck

Info

Publication number: US2449305A
Application number: US570842A
Authority: US
Inventors: Leo A Lehrman
Original assignee: American Steel Foundries
Current assignee: American Steel Foundries
Priority date: 1945-01-01
Filing date: 1945-01-01
Publication date: 1948-09-14
Anticipated expiration: 1965-09-14

Description

sept. 14, 194s.

L. A. LEHRMAN SNUBBED TRUCK Filed Jan. 1, 1945.

ION w www IN VEN TOR.

Patented Sept. 14, 1948 SNUBBED TRUCK Leo A. Lehrman, Chicago, lll., asslgnor to American Steel Foundries, Chicago, Ill., a corporation of'New Jersey Application January 1, 1945, Serial No. 570,842

2 9 Claims. (Cl. 10S-197) My invention relates to a well known type of railway car truckI having quick wheel change and snubbed features such as described in copending Light application Serial No. 436,731. which has since matured into U. S. Patent No. 2,378,414, granted June 15, 1945.

The general object of my invention is to devise such a railway car truck wherein suitable control means will be associated with the friction shoes to insure substantially constant frictional bearing of the shoes against the side frame columns throughout the life of the shoe and within the range of wear permitted on the friction parts.

A more specific objectof my invention is to devise a railway car truck such as that described wherein friction shoes may be mounted at each side of each bolster end, each shoe being in wedge engagement with a bolster wall and in frictional engagement with the side frame column and wherein resilient means may beso associated with friction shoes as to insure simultaneous and sufilcient bearing against the column and the bolster wedge surfaces.

In one modification I have illustrated a plurality of resilient means associated with each shoe for accomplishing this purpose andv in another modification I have illustrated certain resilient means associated with both shoes and other resilient means independently associated with each shoe.

In the drawings. Figure 1 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 arrange- View being taken approximately in the planes indicated by the line 2--2 of Figure 1.

Figure 3 is a fragmentary sectional view through the bolster in the same plane as the lsectional view of Figure 1, showing the manner of mounting therein one of the resilient means and its associated spring plate.

Figure 4 is a further fragmentary sectional View comparable to that shown in Figure 1, illustrating a modified form of my invention.

In each of the views only one half oi the bolster v and side frame structures are shown inasmuch as the arrangement is similar at opposite ends and opposite sides of the truck.

Referring first to the modiilcation illustrated in Figures 1 to 3, the side frame is of well known truss type having the compression member 2, the tension member 4, and the column 6, thebolster opening 8, the bolster I0 spring-supported as at l2 from resilient means diagrammatically indicated at I4, I4, said resilient means being positioned as at IB on the spring seat portion of the tension member in well known manner.

The end portion of the bolster I0 may be of box section having a top wall I 8, a bottom wall 2o, a side wall 22, a center rib 24, and the spaced transverse webs 2B and 28 (Figure 2) defining with said top and bottom walls a friction shoe pocket 30 at each side of the bolster end, the adjacent side wall being cored away intermediate the webs 26 and 28. The bolster l0 may have the usual inboard and outboard column guides 3l and 33. Within each pocket 30 may be mounted a friction shoe 32, a cuplike structure of generally rectangular form having the vertical friction wall 34 bearing as at 36 against the wear plate 38 conveniently mounted on the intermediate guide portion of the adjacent column 6. Within each friction shoe 32 may be housed an auxiliary spring 40, the lower end oi said spring being seated as at 42 on the bottom wall of said shoe and the upper end thereof bearing against the bolster top wall i8 at the top of the pocket 30. The friction shoe 32 is formed in well known manner with a lateral Iportion or wing at each side thereof, the lower surface of each wing being diagonally formed to afford a bearing as at 44 against the adjacent ledge 46formed as an integral part of each of the transverse Webs 26 and 28. Each ledge 45 is slightly crowned, as Well appears in Figure 3, in order to permit some .rocking action of the shoe Ias it seats on the spaced ledges, such rocking action being necessary in order to accom-` modate some tilting movement of the bolster with respect to the side frame while permitting the friction wall 34 to have full bearing against the adjacent column. The rear wall of lthe friction shoe 34 projects between the

spaced ledges

46, 46

and may bear as at 48 against the central portion` of the spring plate or spring seat 50, saidspring seat extending longitudinally of the bolster, as clearly shown in the top plan view of Figure 2, in order to afford bearing for the full length of the resilient pad 52, one face of which may be vulcanized thereto. The opposite face of the rubber block or"resilient pad 52 may bea-r against the center rib 24 and vertical expansion of said member 52 may be restricted by its bea-ring against the top and bottom walls of the bolster, as well seen in Figure 1, A portion of the center .rib 24 i may be cored away to form therein a longitudinal sloti "(Figure 2) to accommodate flow of the member 52 under compression.

'I'he configuration of the resilient member 52 and its position within the bolster prior to assembly of the friction shoe in the pocket is well shown in the fragmentary view of Figure 3. It will be seen that some clearance is afforded above and below the distortable block or pad 52, and likewise, the slot 54 affords additional space for such distortion and in suchdirection that the blocks at opposite sides of the truck might bear against eachother under conditions of maximum distortion or flow of the resilient material. This member 52 will be subject to a certain amount of compression as soon as the friction shoe is mounted in the bolster end and assembled into operative position in abutment with the adjacent side frame column. The amount of compression of'the member 52 will vary as the bolster moves laterally between the side frame columns and as wear of the friction face of the shoe takes place against the friction face of the column,

v In this arrangement, the spring 40 is under such compression as to maintain the friction shoe 32 at all times seated against the spaced ledges 46, 415, urging the shoe downwardly into wedge engagement therewith and maintaining the friction wall 36 in engagement with the adjacent column. At the same time the resilient pad 52 is afforded such characteristics as will constantly urge the frction shoe outwardly and maintain it in a substantially vertical position regardless of such tilting action of the bolster as may be permitted within the existing tolerances under service conditions. The pad 52 is so formed as t-o afford bearing against substantially the full vertical height of the friction shoe at the back thereof, as well illustrated in Figure 1, and the upper and lower edges of the member 52 are brought into such bearing with the top and bottom walls of the bolster as at 5B and 58. It will be noted that the shoe is maintained in a central position between the walls 26 and 28 of the pocket by the pad 52 being placed in shear lto yieldably resist lateral and vertical movement ofthe shoe in the bolster.

In the modification illustrated in Figure 4 the side frame' and bolsterand friction shoe structure is substantially the same as that ofthe modification previously described except for the conguration of the rear wall of the friction shoe. In the modification of Figure 4 the side frame column |02 is afforded a wear plate |04 against which may seat as at |06 the friction wall |08 of the shoe generally designated H0, said shoe having the general form of the previous modification with each lateral wing portion bearing as at ||2 against the bolster ledge i4. As in the previous modification, Ithe friction shoe houses a compression spring H6, the lower end of which may seat as at ||8 against the bottom wall of the friction shoe and the upper end as at |20 against the Itop wall |22 of the bolster generally designated |24.

The form of the friction shoe 0 differs from .that of the previous modification in that the back wall has on the outer face thereof the round lug |26 affording positioning means for the compression spring |28 which may bear as at |30 against the rear wall of the friction shoe. Said spring |28 may extend through an opening cored in the bolster center rib |32 and the opposite end thereof may bear as at |34 against the friction shoe |38, similarly mounted at the opposite side of the bolster.

In the modification .of Figure 4, it will be apparent that the friction shoesare'urged laterally of the bolster by the compression spring |28 compressed therebetween and extending laterally o! the bolster, said spring |28 performing as a single unit the functionl performed by the two

resilient members

52, 52 in the modification previously described. In the modification of Figure 4, the compression spring |28 will be under such compression and have such a capacity as will be sufficient to prevent the friction shoe from ltilting away from the friction surface on the side frame column when relative movement of the bolster with respect to the side frame might tend otherwise to tilt said shoes. The spring |28 is afforded such diameter as to permit it to bear adjacent the upperand lower edges of each friction shoe, as well i1- lustrated. At the same time, the compression spring IIB will be of such capacity as to maintain lthe wing portions of each friction shoe in engage-7 ment with the ledges H4, H4 at each side thereof. thus preventing vertical play between the bolster and the friction shoes housed therein.

It is to be understood that I do n-ot wish to be limited by the exact embodiments of the device shown which are merely by way of illustration 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 with pockets adjacent said columns, a wedge surface in each pocket, a friction shoe bearing on said surface and against the adjacent column, resilient means within each shoe compressed be- 'tween a wall thereof and a `spaced wall of said bolster for urging said shoe along said wedge surface and against the adjacent column, and resilient means interposed between the shoes in respective pockets and operative to oppose movement of said shoes toward each other, said lastmentioned resilient means comprising distortable blocks, each block bearing against a plurality of angularly arranged walls of said bolster, and an opening in one of said bolster walls through which said distortable blocks may flow against each other.

2. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster resiliently supported on said frame between said columns, a pocket in each side of said bolster comprising spaced ledges with wedge faces, a friction shoe in each pocket intermediate said ledges with means bearing on said faces, said shoe having a wall engaging a friction surface on the adjacent column, and a plurality of resilient means associated with each shoe, one of said resilient means being interposed between a wall of said shoe and a spaced wall of said bolster and the other of said resilient means being interposed between another wall of said shoeand a wall of said bolster approximately at right angles to said first-mentioned bolster wall.

3. 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 spaced ledges with wedge faces, a friction shoe in each pocket with means bearing on said faces, said shoe having a wall engaging a fric- .tion surface on the adjacent column, and a plurality of resilient means associated with each shoe, one of said resilient means being interposed between spaced horizontal walis of said shoe and said shoe and said bolster.

' said bolster and the other of said resilient means being interposed between spaced vertical walls of 4. In a railway car truck. a side frame having spaced columns defining Vin part a bolster opening. a bolster supported on said frame between said columns, a pocket in each side of said bolster comprisingu spaced ledges with wedge faces, a friction shoe in each pocket intermediate said ledges with Ymeans bearing on said faces, said shoe having a wall engaging a friction surface on the adjacent column, and a plurality of resilientmeans associated with each shoe, one of said resilient-means being housed within said shoe and compressed between a wall of said shoe and a spaced wall of" said bolster and the other of said resilient means be ing compressed between another wall of said shoe and another wall of said bolster.

f fracasos' tively to urge sind shoe downwardly and laterally of said bolster.

9. In a railway car truck, a side frame having. spaced columns defining in part a bolster opening, a bolster resiliently supported on said frame between said columns, a pocket in each side of said bolster comprising spaced ledges with coplanar wedge faces, a friction shoe in l each pocket with means bearing `on said faces.

said shoe having a wall engaging a fric-tion surface on the adjacent column, and a plurality v of resilient means associated with each shoe and 5. 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 bearing on said surface and against the adjacent column, resilient means within each shoe compressed between a wall thereof and a spaced wall of said bolster for reacting .against angularly arranged walls of said bolster, one of said resilient means urging said shoe into wedge engagement with said faces and surface and the other of said resilient means urging said shoe into engagementwith said surface.

10. 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 urging'said shoe along said wedgesurface and 6. In a railway car truck. a side frame havingspaced columns, a bolster supported on said frame with pockets adjacent said columns, a wedge surface in each pocket, a friction shoe bearing on said surface and against the adjacent column, `resilient meam within each shoe compressed between a wall thereof and a spaced wall of said bolster for urging said shoe along said wedge surface and against the adjacent colummand resilient means interposed between the shoes in respective pockets i them against said wedge surfaces and 'other of said Vresilient means being interposed between respective shoes and an intermediate wall of said bolster, and an opening in sai-d wall through which said last-mentioned resilient means may flow to bear against each other.

8. In a railway car truck, a side frame having spaced columns defining in part a bolster opening, a bolster resiliently supported on said frame between said columns, a'pocket in each side of said bolster comprising spaced ledges with'coplanar wedge faces, a friction shoe in each pocket intermediate said ledges with means bearing on comprising spaced ledges with coplanar wedge faces, a friction shoe in each pocket intermediate said ledges with means bearing on said faces and having a wall engaging a friction surface on the adjacent column, and a plurality of resilient means abutting each shoe and reacting against angularly arranged walls of said bolster, one of said resilient means urging said shoe downwardly and the other of said rasilient'means urging it outwardly of said bolster.

, 1l. In a railway car truck, a side frame having spaced columns, a bolster supported from said frame and having pockets adjacent said columns,

- friction shoes in said pockets in wedge engagement between bolster surfaces and said columns, and a plurali-ty of resilient means associated with said shoes, one of said resilient means bearing against both of said shoes .to urge themin opposite directions in a given plane and other of said resilient means being independently associated with each shoe and reactive against an 'adjacent bolster wall to urge said shoe in a direction angularly related .to said plane.

l2. In a railway car truck,` a side frame having spaced columns, a bolster spring-j-supported on said frame with pockets adjacent respective columns. friction shoes in said pockets in wedge engagement with bolster walls in respective pockets and with said columns, and resilient means associated with said shoes, certain of said resilient means being compressed therebetween and other of said resilient means being independently associated with respective shoes to urge -them into said wedge engagement, said last-mentioned resilient means being housed in respective shoes, and reacting against a horizontal bolster wall.

13. In a railway car truck, a side frame having -a column member with a friction surface, a bolster spring-supported from said frame with a pocket adjacent said surface. spaced ledges in said pocket, a friction shoe in wedge engagement with said ledgesl and having .a friction wall bearing against said surface, and a plurality of resilient means associated with said shoe and oriented in different directions and respectively -compressed between said shoe and angularly arranged walls of said bolster, one of said resilient means being housed in said shoe.

14. In a railway car truck, a side frame having a column with a friction surface, a bolster spring-supported from said frame and having a pocket adjacent said surface, spaced ledges -in said pocket having diagonally arranged crowned faces, a friction shoe within said pocket and havface.

. accasionl ing means in wedge engagement with said faces and a wall engaging said surface. and a plurality of resilient means associated with said shoe and reacting against angularly arranged walls of said bolster, one of said resilient means urging said shoe against said faces and the other Vof said resilient means urging said shoe against said sur- 15. In a railway car truck, a side frame having spaced columns, a bolster supported from said frame with pockets adjacent said columns, friction shoes in said pockets in wedge engagement between bolster surfaces and said columns,

and a plurality of resilient means associated with said shoes, certain of said resilient means being Y independently associated with respective shoes to urge them in a vertical direction and other of said resilient means being operative .to urge said shoes in a horizontal direction.

16. In a railway car truck, a. side frame having spaced columns, a bolster supported from said frame with pockets adjacent sal-d columns, friction shoes in said pockets in wedge engagement between bolster surfaces and said columns, and a plural-ity of resilient means associated with said shoes, certain of said resilient means reacting against angularly arranged walls of-said bolster and being compressibleY by said shoes to engage each other and other of said resilient means being housed in respective shoes and reacting against a common bolster wall.

17. In a railway car truck, a side frame having spaced columns, a bolster spring-supported on said frame with pockets adjacent respective columns, fnlction shoes in said pockets in wedge engagement with bolster walls thereof and with said columns, and resilient means associated with said shoes, certain of said resilient means being positioned intermediate said shoes and compressible thereby to abut each other and other of said resilient means being independently associated with respective shoes to urge them into engagement with said first-mentioned bolster walls and with said columns. certain of said resilient means reacting against a horizontal wall of said bolster and other of said resilient means reacting against a vertical wall and a horizontal wall thereof.

18. In a railway car truck, a side frame having spaced columns, a bolster supported between said columns with pockets thereadjacent, a pair of wedge surfaces in each pocket, a friction shoe vseated on each pair of wedge surfaces in engagement with the adjacent column, and resilient means 'associated with sai-d shoes, certain of said resilient'means being positioned intermediate said shoes and compressible thereby to engage each other under certain operating conditions and 8 ster walls and being associated with respective shoes for urging them Aalong said surfaces.

20. In a railway car truck, a side frame having a column member with a friction surface, a boister supported from said frame with a pocket adjacent said surface, spaced diagonal ledges in said pocket, a friction shoe in engagement with said ledges and having a friction wall bearing against said surface, and a plurality of resilient means associated with said shoe and oriented indifferent directions and respectively compressed between said shoe and angularly arranged walls of said bolster.

21. In a railway car truck, a side frame having spaced columns, a bolster supported from said frame with pockets adjacent said columns, friction shoes in said pockets in wedge engagement Ibetween bolster surfaces and said columns, and

a plurality of resilient means associated with said shoes,l certain of said resilient means being independently associated with respective shoes to urge them in a. vertical direction and other of said resilient means being operative to urge said shoes in a horizontal direction, said last-mentioned resilient means being positioned intermediate said shoes and reacting against each other under conditions of maximum compression.

22. In a railway car truck, a side frame having spaced columns, a bolster spring-supported on said frame with pockets adjacent said columns, friction shoes in said pockets in wedge engagement with bolster walls in respective pockets and l with said columns, and resilient means associated f with said shoes, certain of sai-d resilient means beother of said resilient means being associated with respective shoes and operative to urge said shoes along said wedge surfaces, s-ai-d certain resilient means reacting against angularly arranged walls of said bolster land said other resilient means reacting against one of said walls.

19. In a railway car truck, a side frame having spaced columns, a bolster supported between said columns with pockets adjacent thereto. a palir of wedge surfaces in each pocket, a friction shoe seated on each pair of wedge surfaces, and resilient means associated withsaid shoes, certain of said resilient means reacting against angularly arranged walls ,of said bolster and being interposed between said shoes for urging them outwardly against said columns and other of said resilient means reacting ragainst one of said boling positioned intermediate said shoes and under certain operating condi-tions compressible thereby to engage each other and other of said resilient means being independently associated with respective shoes .to urge them into said wedge engagement.

23. In a railway car truck, a side frame having spaced'columns, a bolster spring-supported on said frame with pockets adjacent said columns, friction shoes in said pockets in Wedge engagement with bolster walls in respective pockets and with said columns, and resilient means associated with sai-d shoes, certain of said resilient means being positioned intermediate said shoes'and under certain operating conditions compressible thereby to engage each other and other of said resilient means being independently associated with respective shoes to urge them into said wedge engagement, said last-mentioned resilient means being" housed in respective shoes and reacting against adjacent bolster walls.

24. In a railway car truck, a side frame, a bolster spring-supported therefrom, and friction means comprising a shoe wedged between the boister and a friction surface on the frame extending transversely thereof, and actuating means for said shoe comprising two independent springs compressed between the bolster and the shoe and acting thereon in angularly related lines of force.

25. In a railway car truck, a side frame comprising spaced columns, a bolster supported from ,said frame between said columns, a pocket in said said pocket, and a plete interposed between said pad and said shoe portion and secured to said pad. said plate and said shoe portion having engage-` ment along surfaces formed and arranged to place said pad in shear to yieldingly resist vertical and lateral movement of said shoe in said pocket.

26. In aV railway car truck. a side frame comprising spaced .columns defining a bolster opening,

opening between said columns. and friction means comprising pockets in opposite sides of said bolster, friction shoes in respective pockets and l a bolster spring-supported from said frame in said shoes for urging the latter against respective colf umns.

27. In a railway car truck. a side iframe comprising a column, a bolster spring-supported from said frame. a friction shoe in wedge engagement with wedge means on the bolster and in frictional engagement with the column along a surface extend-ing transversely of said frame. spring means compressed between the bolster and the shoe for urging the latter into said wedge engagement, and horizontal spring means independent of the rstmentioned spring means and compressed between the bolster and the shoe for urging the latter against said .column independently of said wedge means.

30 Number.

28. In a railway car truck, a side frame. a bol'- ster spring-supported therefrom. a friction shoe s in wedge eng-agement with the bolster and in frlctional engagement with the frame along a sur- -iace extending transversely thereof. and actuating ,means for said shoe comprising two independent springs compressed thereagainst and against the bolster, one of said springs acting horizon-tally on said shoe and the other acting vertically thereon.

29. In a railway car truck. a side frame comprising spaced columns, a bolster spring-sup- -ported from said frame between said columns, and friction means comprising pockets in opposite sides of said bolster, friction shoes in respective pockets wedged between said bolster and respective columns, resilient means carried by the bolster and urging said shoes to the wedged positions thereof, and horizontally acting spring means in dependent of said resilient means and housed within the bolster for urging each shoe against the adjacent column.

LEO A. LEHRMAN.

.REFERENCES CITED 'UNITED STATES PATENTS Name Date '2,129,408 Davidson Senti 6. 1938 2,333,921 Flesch Nov.A 9, 1943