US2359806A

US2359806A - Duplex brake

Info

Publication number: US2359806A
Application number: US474113A
Authority: US
Inventors: Carl E Tack
Original assignee: American Steel Foundries
Current assignee: American Steel Foundries
Priority date: 1943-01-30
Filing date: 1943-01-30
Publication date: 1944-10-10
Anticipated expiration: 1961-10-10

Description

Oct. 10, 1944.

c. E. TACK y DUPLEX BRAKE Filed Jan. 30, 1943 3 Sheets-Sheet 1 QG, f

3 Inge] am, .w 4.4\" il QN A y.,

,3 Sheets`Sheet 2 C. E. TACK DUPLEX BRAKE Filed Jan. 30,l 1945 Oct. 1o, 1944.

C. E. TAC-K Oct. l0, 1944.-

DUPLEX BRAKE Filed Jan. 50, 1945 s sheets-sheet s Patented Oct. 10, 1944 DUPLEX BRAKE Carl E. Tack, Chicago, Ill., assgnor to American Steel Foundries, Chicago, Ill., a. corporation of New Jersey Application January 30, 1943, Serial No. 474,113

(Cl. 18S-33) 23 Claims.

My invention relates to brake rigging and more particularly to a, type of railway brake rigging sometimes called Duplex or Duo-Simplex in which each Wheel is braked by a friction shoe engaging the periphery thereof as well as by shoes engaging the inboard and outboard sides thereof. l

My invention comprehends an arrangement in which one or more of the friction shoes is formed of iron and other of said shoes are formed of composition in order to obtain a combination of the torque characteristics of iron and composition shoes in combination with an iron wheel.

An object of my invention is to obtain equalized heating of the wheels by braking the sides as well as the periphery thereof in the manner above described, said equalized heating reducing the tendency of the wheels to crack as a result` of thermal stresses due to braking forces thereon.

Another object of my invention is to design a Duplex brake arrangement of the generic type disclosed in the co-pending application Serial No. 439,370, filed April 17, 1942, in the United States Patent Oice in the names of Carl E. Tack and Wesley A. Helsten, in which live and dead truck levers serve as actuating means for the friction shoes, said levers being in turn actuated by interconnected live and dead cylinder levers connected to opposite ends of truckmounted power cylinders in what is generally termed a unit cylinder arrangment. Y

In the present invention the friction shoes at corresponding sides of the truck are actuated through brake beams connected to the truck levers and extending transversely of the truck, one of the beams associated with each wheel extending above the axle level and the other beam associated with said wheel extending below the axle level. l

Another object of the present invention is to design a brake rigging such as above described in which one of the truck levers associated With each wheel is operatively connected to an equalizer lever having operative engagement at opposite ends thereof with a pair of bell crank levers supported from the truck frame and carrying friction shoes for engagement with inboard and outboard sides of the adjacent wheel as above described.

y In the drawings,

Figure l is a top plan View of a railway car truck embodying my invention, and Figure 2 is a, side elevation of the structure shown in Figure 1. Y

- Figure 3, is a fragmentary end view taken from the right as seen in Figures 1 and 2, and Figure 4 is a sectional view taken in the planes indicated by the line 4-4 of Figure 2.

In each of said figures certain details may be omitted where they are more clearlyseen in other views. Y

Describing my invention in detail, the truck frame generally designated 2 comprises theside

rails

4, 4, the

end rails

6, 6 and the spaced

transoms

8, 8 between which a load carrying member or bolster (not shown) may besuspended in the usual manner. Eachside rail at each end thereof is formed with a pair of spaced pedestal legs I0, I0 adapted for the reception therebetween of a journal box (not shown) formed and arranged for the accommodation of the adjacent end of the associated wheel and axle assembly fragmentarily indicated at I2.

At opposite sides of each wheel are disposed the live and dead truck levers I4 and I6, the ydead truck lever being pivotally iulcrumed at its upper end as at I8 from a bracket 20 which may be formed on or secured in any convenient manner to the truck frame. The corresponding dead levers I6, I6 at opposite sides of thetruck are pivotally connected intermediate their ends as at 22, 22 respectivelyl to the

brake beams

24, 24, and each dead lever is operatively associated at its lower end With friction 'means for engaging inboard and outboard surfaces of the adjacent wheel as hereinafter morey fully described.

Each beam 24 is pivotally connected at 26 adjacent each end thereof to one end of a pull rod 28, the opposite end of said rod being pivotally connected at 30 to the adjacent live lever I4. The lower ends of corresponding live levers I4, I4 at opposite sides of the truck are pivotally connected at 32, 32 to

fulcrum jaws

34, 34 on the

brake beams

38, 36 extending transversely of the truck in the usual manner, each beam being provided with a jaw 38 pivotally connected at 48 to the lower end of a brake hanger 42,

the upper end of said hanger being pivotally connected at 44 to the hanger bracket 48 of usual form, said bracket being secured at 48 to the adjacent transom 8. Each end of each beam 36 is provided with a trunnion 50 (Figure 1) for pivotal engagement with a. brake head 52 in the usual manner, said brake head carryinga brake shoe 54 for engagement with the periphery of the adjacent Wheel and said head being afforded additional support in the usual manner lby means of a brake hanger 56 pivotally connected at 58 to the bracket 88 on the truck frame.

The lower end of. each dead truck lever VI6 is fulcrum casting 12 and said levers carrying on opposite corresponding ends thereof the

brake shoes

82, 82 for engagement with inboard and outboard surfaces on the adjacentrwheel. Re-

lease means for the bell crank levers 18, 18 is provided in the form of

tension springs

84, 84 underlying the equalizer lever 68 and pivotally connected at opposite ends thereof as at86, l88

to the respective bell crank levers and at `88, 88 to the

wing portions

90, 90 on the fulcrum casting 12. It may be noted that the casting 12 may be afforded a torque connection to the truck frame by means of a ange`92 on the top thereof, said flange being pivotally connected at -94 to the hanger 95 which is *pivotally connected at 88 to the truck frame. y

It'may also be noted that the bell crank levers 18, `18 associated with each -wheel and the cooperating equalizer lever 6-8 lie in a plane diagonal with respect to the horizontal and approximately bisecting the axis of said Wheel, although it will be understood that, -if desired, said levers may be disposed in a horizontal plane.

Actuating means for -the rigging at each side of the truck may be provided in the form of a power cylinder mounted at |02, |02 on a cylinder pad |04 on the truck frame, the piston rod |08 projecting from one end of said cylinder being pivotally'connected at |08 tothe outer end of the live cylinder'lever ||0, said cylinder lever being pivotally connected intermediate its ends as at ||2 to a pull rod A| |4,'and said cylinder lever |.|0 being pivotally connected at its innerfend as at ||8 to a pull rod or link ||8 afforded pivotal connection at |20 to the upper end of the adjacent live truck lever I4.

The pull -rod ||4 is pivotally connected at its opposite end as at |22 to the dead cylinder lever |24 intermediate its ends, said rod being provided with amanual slack `adjuster |26 of usual form. Thevouterend-of the dead cylinder lever |24 -is pivotally connectedv at |28 to .the automatic slack adjuster means |29 secured at |30, |30 to the `cylinder 1|00, and the innerend of the dead cylinder lever |24 is pivotally connected at |32 to the Apull rod .or link |34 which is afforded pivotal connection at |36 to the upper end of the adjacentlive trucklever. I4. The live and dead-cylinder levers ||0 `and.|24Y may be afforded slidable support in the usual manner from support brackets-|38, |38 mountedron the truck frame.

In operation of the brake rigging shown in the bottom half of -Figure -1, the .piston rod |08 moves to the left, whereby the Llive cylinder lever |||J is moved ina clockwise vdirection about the pivot point ||-2, the pull rod ||4causing the dead cylinder lever |24 tomovein a counterclockwise direction about the vpivot point|2.8. Through its connection to the associated cylinder lever, each live truck lever is caused to pivot about the pivot point 30, whereby the'associatedfriction shoe 54 is engaged with the `.periphery of theadjacent wheel and at substantially the ysame time by means of the fpull rod A28 Athe associated .dead

truck lever is caused to move about its pivot point I8, whereby the associated equalizer lever 68 is urged against the adjacent bell crank levers 18, 18 to urge the

shoes

82, 82 against the inboard and outboard surfaces of the adjacent wheel] It may be noted that in the event of relative lateral movement between the wheel and axle assemblies |2, I2 and the truck frame 2, the equalizer levers 88, 68 -will rock on the arcuate ends of the bell crank levers 18, 18 to afford equalized pressure by the

shoes

82, 82 against the wheels.

Itwill be understood that an object of my invention is -to provide

composition friction shoes

82, 82 vand 'an iron friction shoe 54 for association with .each fwheel, whereby advantage may be taken of the combination of torque charac- Vteristics `of composition and iron braking material acting against the iron wheel. However, it will be understood that all of the

shoes

82, 82 and-54 may be iron or all may be composition, if desired. It will also be apparent that bylmeans of the brake arrangement associated with each wheel, 0said wheelwill-be afforded lequalized heating by the'associated shoes, thus tending to prevent cracks in the Wheel from thermal stresses resulting from braking forces acting thereon.

'It is to'be understood `that I do not wish to be limited by the exact embodiment of -the devicel shown Ywhich is merely by way of illustration vand not limitation fas 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 vscopebf the claims.

Iclaim:Y

1. In a brake arrangement, a vehicle frame, a supporting wheel and axle assembly comprising anaxle with wheels thereon, brake vbeams at opposite sides of said assembly, dead truck levers fulcrumed atftheir upper endsvfrom said frame, said levers being pivotally connected` intermediate their'ends to one of .said beams, and said levers being operativelyassociated-at their lower ends with friction means, live truck levers connected at their lower ends vto theother Sof said beams, friction shoes supported by the -last-mentioned beamy for engagement with the peripheries Yof said wheels, pull rods pivotally-connected to the live levers intermediate Ytheir ends and pivotally connected to the first-mentioned beam, power means operativelyassociated with thea-live levers, said lfriction means comprising friction shoes adapted to engage the inboard andoutboard sur. faces of each wheel, bell cranklevers eng-aged'at corresponding ends Withsaidshoes, and an equalizer lever in abutment'with opposite corresponding ends of said bell crank levers, a fulcrum member hung from said frame and affording fulcrums for -said bell crank levers intermediate their ends, said members also affording slidable support for said equalizer lever, `anda connection between said equalizer lever and the lower end of the associateddead lever.

2. In a brake-arrangement,..a vehicle frame, a supporting wheel -and axle assemblyrcomprising an-.axle with Wheels thereon, .brake :beams at opposite sides of said assembly, dead truck levers fulcrumed at their upper ends from .said frame, said levers being pivotally connected intermediate theirY ends toone of said beams, and said levers being operatively associated at their lower ends withlfrictiommeans, live truck levers connected at their lower ends to the other yof saidbeams, friction .shoeswsupportedby the lastmenticned beam for engagement with the periph; eries of said wheels, pull rods pivotally connected to the live levers intermediate their endsand pivotally connected to the first-mentioned beam, and power means operatively associated with the live levers, said friction means comprising an equalizer lever, means on the frame affording slidable support therefor, bell crank levers operatively associated Vwith said equalizer lever :and carrying friction shoes for engagement with inboard and outboard surfaces on the adjacent wheel, and an operative connection. between said equalizer lever and the adjacent dead truck lever. 3. In a brake arrangement, a truck frame, a ,supporting wheel and axle. assembly "comprising an axle with wheels mounted thereon,llive and dead truck levers at opposite sides of each wheel, thedead truck levers being pivotally fulcruned at their upper ends from said frame, a brake beam pivotally connected to the dead levers in termediate their ends, said beam extendingabove -the axle level, a brake beam extending below fthe axle level, operatively associated with the lower ends of said live levers, 'and carrying friction means for engagement with said wheel, friction means operatively associated with the dead levers and adapted for 'engagement with said wheels,

pull rods connecting the first-mentioned beam to said live levers intermediate their ends, and power means operatively associated with said live levers, said last-mentioned friction means comprising friction shoes at inboard and'outboard sides of each wheel. 4.A In a brake arrangement, a vehicle frame, a supporting wheel and axle assembly comprising an axle with wheels. thereon, brake beams at opposite sides of said assembly, dead truck Ilevers fulcrumed at their upper ends from said' frame, said levers being pivotally connected intermedif ate their ends to one of said beams', and s aid levers being operatively associated'at'their lower ends withfriction means adapted to engagein-V board and outboard surfaces on `saidjwheels' ,'live truck levers connected at their lower ends'to the other of said beams, friction shoes supportedby the last-mentioned beam for engagement with the peripheries of said wheels, pull rods pivotally connected to the live levers intermediate their ends and pivotally connected to'the first-men; tioned beam, and power means operatively associated with the live levers.

5. In a brake arrangement, a vehicle frame, a supporting Wheel and axle assembly comprising an axle and a member rotatabletherewith,l friction shoes for engagement with opposite sides of said member, bell crank levers connected at cora responding ends to respective shoes, means suspended from said frame and affording a, fulcrum for said leversintermediate theirends, an equalizer lever abutting the oppositev corresponding ends of said bell crank levers, means aiordingv slidable support for said equalizerlever, and ac` tuating means for urging said equalizer leveragainst said opposite ends whereby said shoes are 'engaged with said member, said bell crank and equalizer levers being disposed in a plane diagonal with respect to the horizontal.

` 6. In a brake arrangement, a vehicle frame, a supporting wheel and axle assembly comprising an axle and a member rotatable therewith, friction shoes for engagement with opposite. sides of said member, bell crank levers connected at cor-A responding ends to. respective shoes, means slus-l Pndedfffmisedfiaea ed @Ordine a .fulcrum for said levers intermediate their ends,` an equalizer lever abutting the 4opposite corresponding ends of said .bell crank levers, means affording slidable :support for said equalizer lever, actuatf ing means for urging said equalizerl lever against said opposite ends whereby said shoes are engaged lwith said member, and resilient release means connected to said opposite corresponding ends and to said frame. .l g 7. In a brake arrangement, a truck frame, a supporting wheel andaxle assembly comprising an axle with wheels mounted thereon, live and deadvtruck levers atopposite sides of -each wheel, brake beams pivotally connected to corresponding truck levers at opposite sides of the truck, friction meanscarried by one of said beamsfor engagement with the wheels, friction means actuated by the levers associated with the` other beam, the last-mentioned friction means also being adapted to engage -the wheels, pull rods pivotally connecting the last-mentioned beam to the levers associated with the first-mentioned beam, and power means operatively associated with the live levers, said last-mentioned friction means comprising friction shoes at inboard and outboard sides of each wheel.

8. In a brake arrangement, a truck frame, .a supporting wheel and axle assembly comprising an axle with wheels mounted thereon, live .and dead truck levers at opposite sides of each wheel, a brake .beam connecting thev dead levers, a brake beam hung from the frame, and carrying friction means for engagement with4 the wheels, connections between the live levers and the last-mentioned beam, pull rods pivotally connected to the rst-mentioned beam and to the live levers, friction means actuated by the dead levers and formed and arranged for engagement with radial faces on said wheels, and operating means associated with the live levers, said last-mentioned friction means comprising a friction shoe spaced axially of each wheel and engageable therewith during a braking operation. 9, In a-brake arrangement, a vehicle frame,` a supporting .wheel and axle assembly comprising an axle and a concentric member rotatable therewith, brake shoes for engagement with opposite sides of said member, bell crank levers connected at corresponding ends to respective shoes and at opposite corresponding ends to actuating means, and a fulcrum for said levers intermediate the ends thereof, said bell crank levers being disposed in a plane diagonal with respectvto the horizontal, said actuating means comprising an equalizer lever bearing at opposite ends thereof against arcuate surfaces on said opposite corresponding ends. t 10. In a brake arrangement, a vehicle frame, a supporting Wheel and axle assembly comprising an axle and a concentric member rotatable therewith, brake shoes for engagement with opposite sides of said member, bell crank levers connected at corresponding ends to respective shoes and at opposite corresponding ends to actuating means, a. fulcrum for said levers intermediate the ends thereof, and resilient release .means connected a supporting wheel and axle assembly comprising spaced Wheels; live and dead truck levers at opposite sides of said assembly, beams extending transversely of said frame 4and connected respectively tocorrespondin'g' live anddead truck levers, friction means supported 'by -oneofsaid beams for engagement with the peripheries of `said wheels, pull Vrods connecting the :live `truck levers to the other of said beams, said live levers being connected to said rst-mentionedbeam and lfriction means operatively associated with the dead levers, said last-mentioned friction means :bei-ng 4formed and arranged for engagement -with inboard and out-board surfaces on-said'whe'els.

12. In a, brake arrangement, a vehicle .f-rame, a supporting wheel and 'axle' assembly comprising spaced wheels, a brake lbeam extending transversely of said frame and carrying friction-means for engagement with the peripheries of said wheels, friction means for engagement with inboardfand outboard sides of said wheels, and lan operative connection between said beam andsa'id last-mentioned friction means.

13. In Va brake arrangement, a vehicle iframe,

a supporting wheeland aXle assembly comprising f spaced wheels, a brake beam extending transversely of said frame and carryingfrictionimeans for engagement with the peripheries `of said wheels, friction means for -engagement with -inboard and outboard sides of -said wheels, and an operative connection betweensaid-beam and-said last-mentioned friction means, said operative connection comprising interconnected live and dead truck levers at opposite sides of `said :as--

sembly.

14. In -a brake arrangement, a vehicle frame,

a supporting -wheel and axle assembly comprising spaced wheels, a brake beam extending trans'- versely of said frame and carrying friction means for engagement with `the peripheries of said wheels, friction means 4for engagement with ling board and outboard sides of said wheels, and `an operative connection between said bea-m and said board and outboard sidesof-said wheels, and an" operative connection betweensaid :beam and said last-mentioned friction means, said operative connection com-prising live levers conneetedto ltuating'means-for moving said equalizer lever toward lsaid wheel whereby said friction means are frictionally engaged therewith.

1:8. In a -brake arrangement Vfor a railway car truck, a truck frame, a supporting wheel and axle assembly comprising a wheel, ,a fulcrum casting -hung from said `frame adjacent said wheel, bell crank "levers fulcrumed intermediate their ends 'from said casting and carrying vfriction means at their ladjacent corresponding ends forengagement with inboard and outboard surfaces of said wheel, an equalizer 'lever sli'dably supported 'from said casting and bearing against the opposite corresponding ends of said bell crank levers, actuating vmeans for moving said equalizer' lever toward said wheel whereby said friction means are frictionally engaged therewith, and resilient `release means connected 'to said opposite corresponding ends and to adjacent portions of said casting.

19.V In a brake arrangement for a railway car truck, a-truck frame, a, supporting wheel and axle assembly comprising a wheel, a fulcrum casting hung from said frame adjacent said wheel, bell crank levers fulcrumed intermediate their en'ds from said casting and carrying friction means at their adjacent corresponding ends for engagement with inboard and outboard'suriace's of said wheel, an equalizer lever slidably supported from said casting v andgbearing against the opposite corresponding ends of saidbell crank levers, and

actuating means for .moving said equalizer lever" truckllever' operatively ,connectedl to said equalizer lever. k

20. In a brake arrangement for a wheel, a brake beam carrying friction means for 'engagement l with the periphery of Asaid wheel, friction means said beam, dead leversroperativelyassociated Wit-hsaid last-mentioned friction means, and `means connecting said liveflevers to said dead levers, said last-mentioned means' Acomprising s. beam extending transversely ofthe frame 4and-pivcited to said dead levers, and `pull rodsconne'cted tto said last-mentioned lbeam yand tosaidli-ve levers.

16. In a brakearrangement for :a wheel,-abeam at one side thereof carrying friction means ttor for engagement with `radial surfaces on opposite sides of said wheel, `a lever connectedv to said beam, a lever operatively associated with' said last-mentionedfriction means, means interconnecting said levers, and actuating means associated with saidlevers.

AIn a brake arrangement for a wheel, a brakebeam carrying friction Ameans for engagement with the periphery' of' said wheel, friction means for engagement with radial surfaces on opposite sides of said'wheeL'a lever connected to said beam', a lever operatively associated with said 'last-mentioned @friction means, .means in'- terconnecting said levers, and actuating means associatedV with said levers, said interconnecting means Vcomprising abeam'pivoted to said second'- with in'board and outboard surfacesthereof, and

actuating means ,for said friction means com-` prisinglbrakeibeams associated therewith and extending transversely of said frame at opposite sides of each wheel and axle assembly, interconnected live and dead truck levers connected to the beams associated with each assembly, and operating means associated with said live levers.

23. In a brake arrangement, a vehicle frame, spaced supporting wheel and axle assemblies, each comprising an axle and spaced Wheels, friction means for engagement with the peripheries of said wheels, friction means for engagement with l0 inboard and outboard surfaces thereof, and actuating means for said friction means comprising brake beams associated therewith and ex-