US2747519A - Snubbed truck - Google Patents

Description

y 1956 c. HEATER L SNUBBED TRUCK 3 Sheets-Sheet 1 Filed Nov. 13, 1950 672 j J I/IgflENTORS. a m

y 29, 1956 c. HEATER ETTAL 2,747,519

SNUBBED TRUCK Filed NOV. 13, 1950 3 Sheets-Sheet 3 IN V EN TORS.

2.17 z CZZbari z afifi United States Patent SNUBBED TRUCK Charles L. Heater, Flossmoor, Ill., and Albert F. Seelig, Jr., Lemay, Mo., assignors to American Steel Foundries, Chicago, 11]., a corporation of New Jersey Application November 13, 1950, Serial No. 195,182

11 Claims. (Cl. 105197) This invention relates to railway car trucks, and more particularly to a novel friction damped spring suspension for a truck bolster which extends between the side frames and is adapted to support a railway car body.

A primary object of the invention is to devise a simple and economical resilient support for the ends of the bolster, without the necessity of utilizing the helical springs which are conventionally employed for this purpose.

A more specific object of the invention is to support the bolster by means of resilient units mounted on the side frames and comprising layers of flowable resilient material with spring plates sandwiched therebetween.

Another object of the invention is to devise resilient bolster supporting units, such as above described, comprising means for frictionally damping oscillation of the bolster relative to its supporting side frames.

A further object of the invention is to devise an arrangement wherein one or more of the resilient pads are compressed against converging surfaces on each of a plurality of friction shoes which are thus actuated into frictional engagement with friction surfaces, carried either by the frame or by the resilient unit to thereby damp oscillation of the bolster.

Still another object of the invention is to devise an arrangement, such as above described, wherein the resilient units which support the bolster are afforded maximum capacity within the space limitations of a conventional freight car truck.

The foregoing and other objects and advantages of the invention will become apparent from a consideration of the following specification and the accompanying drawings wherein:

Figure l is a fragmentary side elevational view of a freight car truck embodying the invention, portions of the structure being shown in vertical section on line 1--1 of Figure 3;

Figure 2 is a sectional view on line 22 of Figure l with the bolster removed;

Figure 3 is a sectional view on line 33 of Figure l,

with the bolster and its resilient supporting unit shown in elevation; Figure 4 is a fragmentary side elevational view of a freight car truck embodying a modification of the invention with portions of the structure shown in section on line 44 of Figure 6;

Figure 5 is a sectional view on line 5-5 of Figure 4 with the bolster and top spring plate removed;

Figure 6 is a sectional view on line 6-6 of Figure 4, with the bolster and its support means shown in elevation;

Figure 7 is a fragmentary side elevational view of a freight car truck embodying still another modification of the invention, with portions of the structure in vertical section on line 77 of Figure 9;

" Figure 8 is a sectional view on line 8-8 of Figure 7, 'with the bolster removed;

' Figure 9 is asectional view on line 99 of Figure 7, with portions of the structure shown in elevation for the sake ofclarity; and I ice Figure 10 is a sectional view on line 10-10 of Figure 8.

Describing the invention in detail and referring first to the embodiment illustrated in Figures 1 to 3, the novel truck comprises a conventional side frame 2 having a column 4 adjacent each end thereof partly defining a bolster opening 6 and a window opening 8. It will be understood that the structure as shown in Figure l is symmetrical about the line 33, and for this reason, only one-half of the bolster and its supporting structure are illustrated.

The frame 2 is provided at the bottom of the bolster opening 6 with a spring seat 10, affording support for a resilient spring unit generally designated 12. The unit 12 is adapted to support a bolster generally designated 14 which, as best seen in Figure 3, is provided at each side thereof with inboard and outboard lugs or gibs 16 and 18, affording slidable interlock in the usual manner with the related side frame column 4.

It will be understood that only one end of the bolster 14 is shown in Figure 3 and that the bolster extends across the truck for support at its opposite end (not shown) by a side frame 3 and resilient unit 12, identical with those shown in Figures 1 to 3.

The unit 12 comprises a plurality of spring plates 20 which may be formed of steel or any other suitable material, and between each pair of plates 20 is sandwiched a plurality of spaced concentric annular pads, designated 22, 24 and 26, respectively. These pads are formed of any flowable material such as rubber and are spaced from each other to accommodate flow of material under the load of the bolster 14. It may also be noted, as best seen in Figure 1, that the plates 20 beneath the top plate are provided with breather openings 28, communicating with grooves 30 (Figure 3) in the seat 10 which are open to the atmosphere to prevent compression of air between the plates 20, under bolster load. The pads 22, 24 and 26 are preferably bonded to the plates 20 to afford a convenient unit for handling during assembly and disassembly of the truck.

As best seen in Figure 3, when the unit 12 is in assembled position, lugs 32 on the bottom plate 20 project into complementary openings of the side frame spring seat 10, and lugs 34 on the top plate 20 project into complementary openings in a thick resilient pad 36, formed of any suitable resilient flowable material, such as rubber, said pad affording a seat for a spring plate 38, supporting the bolster 14 and having positioning lugs 40 recessed in complementary openings in the bottom wall thereof.

I The bolster 14 is provided at each side thereof with a diagonal wall 42 sloping upwardly and outwardly toward the related column 4 and having a crowned surface 44, as best seen in Figure l, seated against a substantially flat diagonal surface 46 of a friction shoe generally designated 48. The shoe 48 is disposed within a recess 49 of the plate 38 and is provided on the bottom thereof with a spring seat surface 50, preferably sloping downwardly and outwardly toward the related column 4. The shoe is also provided on its rear or inner surface beneath the surface 50 with another spring seat surface 52. As best seen in Figure 1, the surfaces 50 and 52 converge toward the column 4, and the surfaces 46 and 50 diverge toward the column 4, whereby the load of the bolster on the friction shoe 48 and compression of the pad 36 against the surfaces 50 and 52, by reason of the bolster load imposed on said pad, urge the shoe 48 into frictional engagement with a wear plate 54, secured in any desired manner as by welding to the column 4.

Referring again to Figure l, the wall 42 is preferably provided with a slot 55 receiving a lug 56 projecting upwardly from the shoe surface 46, and the lug is provided with an opening 58 for reception of a pin or other key means (not shown) adapted to lock the bolster 14 and shoe 48 together for convenient handling as a unit during assembly and disassembly of the truck. It may be noted that the top spring plate 20 is provide with a recess '60-on theiedge thereof facing the column 4,=wherebyduringcompression of the-unittl2, the-{portion of the friction shoe 148 011 which the surface 25:2"is formed may move vertically. through said-recess 69.

Referring now to the modification "of :{the invention illustrated inFigures 4 to .6 inclusive, .the parts thereof corresponding to those of Figures 1 to .3, areiidentifiedby corresponding numerals, audit is noted that this modification is substantially identical with the embodiment previously described, except that the wedge surface A4 of .the bolster wall 42 is flat and is disposedat a. greater :angle with respect to the vertical. Also :the .portionzof the-shoe 48 above its wedge surface 46 .iseliminated, and the portionrof the 581106 on which the spring seatsurface 52 is formed :is of :somewhat greater :depth than in the previou'sly described embodiment, 'so that the :top two plates 20 are recessed at 60 to accommodate vertical movement of the shoe 48, with respect to the bolster supporting resilientiunit 12. V

"Itmay also be noted that in .the modification of Figures 410' 6, the shoe 48 .is provided=at each side thereof with a triangular wedge lug .62 beneath .the surface '50 and received within a complementary recess of the pad'36. This arrangement not only interlocks the shoe 48 andpad 36 against irelative movement laterally .of' the truck, but .affords additional bearing surface for thepad 36 as the latter is compressed by the bolster :1410 actuate the shoe 48 into frictional. engagement with the.liner.54 mounted onthe column 4.

Referring now .to-the embodiment 'ofFigures'7 to .10 inclusive, parts thereof corresponding to those of .the previously described embodiments are-identified by corresponding numerals. V

ln thegmodification of Figures 7 to '10, each friction plate 54 ismounted on a depending end wall 64 of a bolster supporting spring plate 66"whi'ch is seated on-the top-plate-20 of; the resilientbolster supporting unit 12. 'The' plate 66 is provided with beaded fianges tiS at the inboard and outboard sides thereof, said flanges being connectedto'the end walls 64 by gussets 70. The plate 66 is provided with positioning lugs 72=recessed-in--the bottom-Wall of the bolster 14, and the top plate 20 is provided-with positioning lugs 74 received -Withll1 complementary openings'orholesthroughtheplate -66.

In the embodiment of Figures 7 'to 1,0, the -res"ilient unit 12 comprises solid pads 76 of 'flowable resilient materialgsuch as rubber,interposed between the spring plates 20 and preferably bonded thereto as 'by'vulcanizing. The center plate 20, as best seen in jFigure7, is thicker than the other plates and-is received witl u'n'slots 77 in a pair of rearwardly tapering substantiallytriangular wedge lugs 78 formed .on the rear, surface of each" friction 'shoe 48.

As bes't'seen, in Figure ;the lugs 7 8' of each shoe arereceived Within openings or recesses-180' in the 'pads the resilient unit'lz is.compressed,during .vertical;.9 illa- ;tion of {the bolster 14.. theibolstennpeningj.

We claim: Eln africtionrsnubhing devicelforiarailway car ick having a bolster structure moveable within abolster open compl men ar t h h p 4. in o a ram me er; th s mbinetigen a F93B9ii resilient unit supporting said structure from said frame member, said unit including a plurality of spaced resilient pads of flowable material with spring plates sandwiched therebetween, friction surfaces at opposite sides of said opening, friction shoes engageable with respective surfaces, and operating means for each shoe comprising at least two angularly related surfaces 9n a resilient pad acting against angularly related surfaces of the for thrusting the shoe against the related friction surface.

2. A" friction vdat'nping .unit for 'a railway car truck having a bolster within an opening of a frame inemlierg the combination of a resilient member supporting the bolster from the frame member, said resilient member having a plurality of alternately arranged spring plates and resilient pads of material flowable under the load of the bolster, friction surfaces carried by one of the members at opposite sides of the opening, -friction-shoes engageable with respective surfaces, and actuating means for each shoe comprising angularly 'related surfaces on at least onerof said pads engageab'lewithangularly related surfaces of the shoe for urging it against the-related friction surface. r

3. A friction damping device'for a--railway car truck having abolsterstructuremoveable within a bolster e feningiof a frame unit; the combination of a resilient-unit supporting the bolster structure fromthe frame unit and comprising a pluralityof vertically spaced resilient pads" of material fiowable under the load of said 'b olster'structure, friction surfaces supported-by one of the units at opposite sides of the bolster opening, :friction shoes-engageable with respective surfaces, and actuating means for each shoe-comprising- -a pairofangularly reutd'suifaces thereon converging toward the related friction surface and engaged by at least one of the padsduring eomp'ression o'f the resilient unit bytheload of saidb "are: Structure. 7

14. -In a friction damping device, a railway car truck having a bolster structure moveable within a "bolstfer opening of a frame unit; the combination of a resilient unit supporting the structure from the frame unit" and comprising amass of resilient materiallflowable finder thefload of the bolster,structure friction surfaces carried by one of the units at opposite sides of the b ols ter i s f ict o oe p e b .With re estiv enrf a r m t n means f ea hsho .gin i is were faces jthereon, converging toward the related friction surface and engaged with said mass during eam r thereof uuder load of the bolster stpucture. V

, 5 1 a fiio vda nee ig i'f rilyv y. c 'truc having a bolster structurje mov eable within an op g of a frame unit; the combination of aresilien T p rt n ,said structure: rom said-fr e uni rs a the bolster structure from thefframefunit and ;.c amass of fiowable resilient .lilaterial withQ paced ii plates'interposed between thetop and bottom" or t friction surfaces supported by one; of the .iunits posite sides of thdjresilieht miseri s shoes able with respective surfaces eachpofs aidisho a-pairof faces ngageahlegwt th L I toward the related surfacefa H shoes'being receivable within respective. iei g relative movement between the shoes and s'aid'on pla't'e,

in response to compression of said resilient unit by the load of said bolster structure.

7. In a friction snubbing device for a railway car truck having a bolster moveable Within an opening of a side frame unit; the combination of a resilient unit supporting the bolster and comprising a mass of flowable resilient material, friction surfaces carried by one of the units at opposite sides of the resilient unit, and friction shoes carried by the resilient unit in frictional engagement with respective surfaces, said mass affording a force path between the shoes, between each shoe and the bolster structure, and between each shoe and the frame unit.

8. In a friction snubbing device for a railway car truck having a bolster structure moveable within a bolster opening of a side frame unit; the combination of a resilient unit supporting the bolster structure, friction surfaces disposed in spaced parallel planes carried by the resilient unit at opposite sides thereof, said unit comprising a mass of resilient material flowable under the load of such structure, and friction shoes engageable with respective surfaces and engaged with said mass for actua tion thereby upon compression of said resilient unit by the load of said structure.

9. A friction snubbing device for a railway car truck bolster supported by a resilient unit within a bolster opening of a frame unit, said device comprising friction surfaces carried by one of the units at opposite sides of the resilient unit, friction shoes engageable with respective surfaces and vertically spaced horizontal layers of flowable resilient material constituting portions of said resilient unit, a pair of angularly related surfaces on each shoe converging toward the associated friction surface, certain of said layers of flowable resilient material being compressed against said angularly related surfaces on each shoe.

10. In a friction snubbing device for a railway car truck having a bolster structure Within a bolster opening of a frame unit; the combination of a resilient unit supporting a bolster from the frame unit and comprising vertically spaced horizontal layers of resilient flowable material, friction surfaces caried by one of the units at opposite sides of the resilient unit, friction shoes engaged with respective surfaces, angularly related surfaces on each shoe, said angularly related surfaces engaging at least one of said vertically spaced layers whereby imposition of a load on said bolster structure compresses said layers between said shoe surfaces, said structure and said frame unit.

11. In a friction snubbing device for a railway car truck having a bolster structure movable within an opening of a side frame unit; the combination of a resilient unit supporting the structure in the side frame unit and comprising a mass of flowable resilient material, a portion of said mass being flowable independently of the other portion of said mass, friction surfaces at opposite sides of said resilient unit, friction shoes having wedge engagement with said bolster structure, angularly related surfaces on each shoe converging on the related friction surface, and means on one of said portions engaging the surfaces on each shoe whereby upon compression of said one portion it urges the shoes into engagement with the related friction surfaces.

References Cited in the file of this patent UNITED STATES PATENTS 1,430,230 Hine Sept. 26, 1922 2,058,623 Protzeller et al. Oct. 27, 1936 2,165,375 Heitner July 11, 1939 2,194,792 Herndon Mar. 26, 1940 2,306,395 Cottrell Dec. 29, 1942 2,306,397 Cottrell Dec. 29, 1942 2,328,877 Gallagher Sept. 7, 1943 2,365,199 Light Dec. 19, 1944 2,492,337 Travilla Dec. 27, 1949 2,497,460 Leese Feb. 14, 1950 2,552,668 Dath May 15, 1951 2,554,606 Withall May 29, 1951 2,564,091 Baselt Aug. 14, 1951 2,567,551 Cottrell Sept. 11, 1951 FOREIGN PATENTS 9,127 England Apr. 22, 1903 806,357 France Sept. 21, 1936

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