Патент USA US2132994код для вставки
Oct. 11, 1938. E. G. MUELLER 2,132,994 ' BRAKE MECHANISM Filed may?, 19:57 ¿sheets-sheet i .ElQwmd . .. wm. , _, §` _. / v _ .,_mm NN Mx . Vllmal .A . . ,„v .`... -„ .. à ~ »s NN. .wm ..um . Nm. ,mw bvd@ _ a@ A.s Qw@wát ` ßà, NWN..m MN .NSN |.I !'lî~l|w.|l. ,www MW Q www l„Q , o. A www». _I .TQM _»QWNm.4|@Ñb \ o Aw Y ` Ew H m ww «w .Q Nw uw @J »nn NT 8,NNm. ß .. . o_ am . n„aV E. G. MUELLER BRAKE MECHANISM Filed May 7, 1957 ` für ,2_2 2 sheets-sheet 2 WL. ß www w , _1 en?. 2d INVENTOR (er HIS ATTORN EY Patented Oct. l1, 1938 2,132,994 UNITED STATES ' rA'rENT? OFFICE ~>2,132,994 „ Y ` BRAKE MECHANISM» . Emil G. Mueller, Swissvale, Pa., assigner The American Brake Company, Swissvale, Pa., a. cor poration of Missouri Application Mayu, 1937,y serial No, 141,315» ' , . `1o Claims. (o1, 18s-46.) Y. My invention relates tol brake mechanism', and particularly to improvements ink brake mech anism of the type described and claimed in an application for Letters Patent of the United 5_ States, Serial No. 60,535, filed byNorman W. Tilley, on January 23, 1936, for Locomotive driv-> er brakes. . v which extends transversely'of the locomotive at »the right-hand side of the'wheels 3. 'I'he brake beams are all located‘jinjthe same horizontal plane, whichplaneis disposed rconsiderably be low Vthe horizontal plane passing through the vcenters of the wheels. l 'I'he brake beam 4 is supported for movement v One object of my invention is to provide a between a `brake applying and a brake releasing brake hanger assembly capableV of îsupporting position by kmeans vof a'pair of hanger levers 8, two brake shoes, one for engaging each of two the upper ends of which are pivotallysecured 10 to the locomotive framer by means of pins 9, and ` thev lower ends of which Yare 4pivotally connected adjacent driving wheels, whichhanger assembly shall be so' constructed that the minimum per missible spacing between the driving Wheels need , with the opposite ends of the 4brake beam, only be noV greater than that required for thewheels one of the levers 3 being shown in theV drawings. to clear themselves. Í ~ .Í .. Other objects and characteristic featuresgof my invention will appear as the description pro ceeds. ' - ' ' Secured to each of the levers-8 intermediateY its .ç ends is'. abrake headl I0 carrying, a brake shoe Il whichjiwhen theybrake beam 4 is moved to its brake applying position, is adapted to en. I shall describe one form kof brake mechanism gage thetread of the'wheel I in a zone located 20 embodying my invention, Yand shall then point -some distance vbelow the horizontal plane passing 20 out the novel features thereof in claims. ` through‘the axis of the wheel. ~ l'n the accompanying drawings', Fig. 1 is aview, partly diagrammatic and partly inside eleva tion, showing" one form of brake Am’ec'hanisri'i 'em 25 bodying my invention applied to theV driving wheels of a locomotive -having three pairs'of'driv ing wheels. `Fig. 2 is a plan view of the brake `rigging employed in the brake mechanism shown in Fig. l. Fig; 3 is a side view of one of the 30 Vhanger assemblies forming part of the brake ' ' , -between ra,VV brake _applying anda brake releasing positionl by means` of two lhanger ’levers I2, one ’of which is located’ateach sideV of theîlocomotive. 2,5 VOnly one of the hangerglevers I2 is` shown in the drawings, and asbest seen in Fig.'4, ‘this hanger 'lever comprises 'an upwardly extending arm l2“, therupper‘end of which is'formed with ’ an Voilîset portion 4which-extends into the >plane 30 mechanism shown in the preceding views. Fig. 4 of the Wheelsîat'one side of the adjacent wheel ' is a side View of one of the hanger levers I2 3, »and the' lower end of which lis formed inte grally with a shaftl |21'. The shaft `I2b is jour naled in a suitable bearing I3 formed in the loco motive frame, and is`provided at the end oppo 35 site to the `arm I 2E with `a reduced portion I2d to which a depending'arm |29 vis secured. ï Each arm I2° is disposed some distancefinside ofthe plane of :the wheels, -as willfbe Yapparent ’from kan inspection of Fig; ‘4, and the'lower ends of forming part’of the brake mechanism shown in the preceding views. 35 ' _ Thebrakegbeam 1 is supported for movement ' ` Similar reference characters refer to similar parts in each of the several views. l ' .I ' 'Referring to the drawings, Ihave here‘shown brake mechanism embodying my 'invention `»ar ranged for use in connectionwwithV thef’driving> 40 wheelsk I, 2, and 3 of >Valocomotive» of the‘t'ype having three pairs' of- driving- wheels‘locatedïas closely together asthe necessary'clearance ‘be-, tween the wheels themselves will permit in order Vto decrease the overall length of the locomotive, 45 `and thus facilitate the Vnegotiation oi'- curves by the locomotive, the various parts Yof the loco motive other than >the‘driving wheels being omit .ted from the drawings to simplify the» disclosure. these arms are pivotally ` connectedwith the brake- beam -Tin supporting relation thereto at the oppositefendsof Vthe brake'beam.V `'The arms , ‘I2a`are each providedl attheir upper ends with a brake-head ¿I4 carrying agbrake' shoe I5 which, 45 when thebrake beam 'l is moved to its brake applying position, is adapted to engage the tread Yof' the whee1f3 in a zone', located approximately The brake mechanism comprisesa brake beam the `same 'distance above the horizontal Lplane 50 4 which extends transversely of the'locomotive at passing through the axis of’theïwheels 3, that the left-hand side Yof the wheelsY I, a> brake beam AztheV zone, in which the shoes II are adapted to 5 which extends transversely ofÍ the,- locomotive engage the `wheels I is located below- the plane between the Wheels lj and 2, a brake ¢ beam~^6 ` passing through the axis Iof the wheels I. , which extends transversely of the locomotivel be , `The brake beam-'Bris supported at'each end 55 tweenthe wheels 2 and '3, andra, praise, beam 1 ¿for ,movement ¿between a Vbrakewapplying- and a 50 2 2,132,9e4 brake releasing position by means of a hanger assembly comprising a pair of hanger levers I6 which extend downwardly on opposite sides of the closest portions of the adjacent wheels I and 2 with considerable clearance in the manner shown in Figs. land 3, and which are each pro vided at their lower ends with ahole I1 for the reception of the rounded end of the brake beam is located diametrically opposite to that in which the shoe 26 is adapted to engage the wheel 2. The brake mechanism also comprises means for actuating the brake beams between their brake releasing and brake applying positions to eiïect the application of the brakes. As here il lustrated, these means include a >pair of brake 5. locomotive. VrThese brake cylinders are of similar The hanger levers 16 are pivotallyk secured> cylinders C which are mounted at one Vend of the intermediate their ends to a second pair of hang construction, and‘inasmlich as they form no part 10 er levers I8 intermediate their ends by means ofA my present invention, except in so far as they of trunnions I9 which are formed integral with' v"are used in connection with the remainder of the levers I5, and which extend through vclear-. the brake' mechanism, it believed that for pur- n 15 ance holes 20 formed in the levers i8; and piv otally supported vby the leverslß. at theirupper ends are brake headsfZl carrying brakeshoes" V22 which are adapted toy engage the treads of the tothe zones in which the shoes Hare adapted y 20 to engage the wheels l. lThe hanger >levers I8 vof each pairare disposed inv planes. located out side of the planes> of ytheY contig-unas“hanger` le v V'vers I6, and are pivotally*supportedV atïtheirup»` . per Vends by rmeans of `pins lor »boltsA 23 vmounted. ‘in 'spacedflugs 24. formedfonfthe locomotive frame'. The lower ends of the levers'lS havepivotalìy se Acured‘thereto >brake `h'eadsV 25 carrying brakes . shoes 26 which areadapted to engage the VVwheels Y2 inV zones which 'arel'ocated the same distance .below the axisof'the wheelsl'2 `asthe'zonesin which the shoes 4Il carrie'd‘by the hangerlevers 8 are adapted' to engage’thewheels i.; ` The Aproper spacing between thetleversfiß -.at their lower' endsjis maintained by means V'of bosses 21 formedV` onn the . levers, 'while 'the' ' proper Í spacing between these levers 4at their upper ends is'main tained' by the associated `>brake 'head 2‘Il`."ÍfThe spacing "between the levers Vl 8 at their upper'ends ismaintained by one‘of'the'lugs 24,'.and yat their 40 lower ends‘ by rthe associated brake headlli. The ' distance which the’louter levers IB'and'I B’Yof each hanger assembly is spaced Yfrom'îtheî'outer'fáïces of the associated wheels lnotîsuflicient vto* in' terfere with thev side rodsvoiïthe'locomotiveì ‘ " 45 poses of thepresent disclosure, it is sufñcient to . state that these brake cylinders each include the usual cylinderbody, reciprocable piston (not shown) biased to the inner end of its stroke by wheels I in zones located diametrically'opposite ' the’usual'releasè spring (not shown),r and a push ‘The >brake beam ‘B is suppòrt'edat each end .for movement between -a-brake "applying and a brake releasing position ¿by means Vof'a hanger assembly, the various parts ' of fwhichl are Vsimilar to the corresponding" parts of . the :hangeras 50 semblies'for supporting theîbrake beam 5,' and the parts of 'the hange?ï assembllesïforV support ing 'the brake beamB are designated bythe same `reference characters Yas the corresponding'. parts -of the hanger assemblies’ior supporting Vthe brake beam 5, with the distinguishingexponent Il added thereto. Sincethe parts of the hanger assem .blies for supporting the'brake beam 6 are similar 'to thosefof the hanger assemblies` for supporting thefbrake' beam v5, it‘is believedV that thev con 60 struction'of'these parts willllbe apparent from an inspection ofthe drawings >and from theforegoing description . without further detailed ' description. rod 52 which is operatively connected vtdth' the piston. ` 20 ' " The Vpush rod 52 of each cylinder C is con nected with the upper end of an associated ver tically disposed brake cylinder lever 33 which is pivotally supported intermediate >its ends on a transverse shaft 34, and the lower ends of the 25 vbrake cylinder levers 33 are each operatively connected with an associated horizontally dis posed iioating lever 35 intermediate its ends by means of .a >pull rod 36. The transverse shaft 34 is _adapted to .be secured at VYits ends- in‘ suitable V30 supports (not shown) rnountedfonv the engine frame. Each pull rod'EB is provided at the end which is connected to the associated floating lever 35 with a' slackadjuster'3‘! of well-known construction. The inner endsA of v:the floating 'levers' 35, arev connected by means'of’pullV rods 3S `with theV brake beam 1VV at points equally spaced from its ends, while the outer ends of the floating levers'35 are connected by means of pull rods 39 >with equalizing levers 4ll'at points intermediate the ends of the levers '40. VEach pull rod 38 is provided at each end with a jaw which receives the associated lever y35 or brake beam l, as the »case may be, the jaw on the one pull rod 38 being made sufñciently .long to completely straddle the floating lever- 35 which is'not'connected to this pull rod. ' I . . ' 35 . All() î Y The equalizing levers 40 are eaclrcorlnected at their.inner ends with the brake beam Bat points equally spaced from its ends through the medium oflinks 4|, and at their outer ends through'the medium of pull rods 42 with other equalizing lev ers 43 intermediate their ends.- The pull rods 42 are each provided at the end which is connected to the. associated equalizing lever 4l) with a jaw i » which straddles thev brake beam 6 and which ¿receives.therfequalizing lever, and at the opposite Yend withya `jaw which receivesA the associated ‘,equalizing. lever `43. ' l. ‘ ¿The equalizing levers 43'are each connected at rrtheir inner ends with the brake beam 5 at points equally'fspaced Afrom its endsbysmeans of links lThe hanger levers 181 of .each hanger. assembly 44 while the outer ends of these equalizing levers ' for"'supporting-thermes ’beam '6. arepivotany are each connected by means of .a pull rod 45 with vmounted at'their upper ends on a pinlorbolt 23%, >thebrake beam 4 at pointsîequally spaced from its ï ¿and are provided at their lowerI ends with~ 'a brake » ends. ‘ The pull rods 45 areprovided at the ends fhea‘d ’23 carrying? a brake V'shoe '3U which vis. which are connected with the equalizing levers 43 ’adapted to engage the tread ‘of the associated .with'a jaw-which straddlestheY brake beam 5 and .receives the'Y associated equaiizing lever', and' at fwheel Sfin aizone'located diametrically opposite 70 to lthat inwhich the shoe 'I5 lor .such wheelis adapteduto engage the tread of the wheel. "'.Each ' ’pail` of hanger levers §51 is provided at'the upper ,ends of thejlever's with a brake head v3| carrying their opposite ends Ywith a jaw> which receives 'l the brake beam 4.' ï 7 A ~ ' When the brake cylinders are vented to atmos phere,_ as will normally be the casefthe brake beams are held in theirbrake releasing positions rtread' of theïassoèiated wheel 2 in the -zon’e ¿which Y in whichfthey are shown in the drawings by the " Ya brake shoe 32V which» isv ada'pted to engage lthe ` 3 releasing springs mounted in the brake cylinders, limited îonly to that `required for the wheels to and under'these conditions, thepbrake shoes exert >clear themselves'.` I ï substantially no braking effort on the wheels. When it is desired to apply »the brakes, fluid ~ fAnotlierV advantage of brake mechanism em bodying‘my’inventionristhat the pivotal connec pressure is simultaneously supplied tor the two tion between the brake'r hangers themselves,> be- f tween 'the brake hangersrand the brake shoes, and between the brake hangers and the associated brake cylinders C, which fluid causes'each ’of the push rods 52 to move outwardly in theY associated cylinder in opposition to the bias of the release ~ brake beams are so arranged that substantially springs. This movement ofthe push rods acts no _torsional stress -is` exerted onthese members ' Y through the linkagershown in Figv.~2 Yto move the ' _during an application of the brakes. brake beams 4, 5, 6, and ‘Ito their brake applying Y positions in a manner which will be readily-'under stood from> an inspection of the drawings. The movement of the brake beam '| `to its brake ap plying position causes the associated hanger levers l2 to rotate in a counterclockwi'se direction, and hence causes the brake shoes |5 securedto these '-_Although I have hereinfshown and described only one form ofwbrake'mechanism embodying my invention, `it is Vunderstood that various changes and modifications may 'be made therein within the s'cope’ofthe appended'claims without departing from the spirit andv scope ‘of my inven tion. ` 'y »» A. ` l Having thus -described, myinvention, what> I vlevers to engage the wheels 3.` ' On the initial movement of the brake beam 6 to the right, the hanger levers |61 rotate about the claimisvt’k trunnions |91 on which theyV aresupported vfrom thevlevers |81, and the associated brake shoes> 32 _at -least rtwo longitudinally'aligned» wheels at ‘ move into engagement with the wheels 2. > i" H Y _` »1.'In a.> brake mechanism for a vehicle having one side of` the vehiclearranged closely‘togetlier, a first pairvr of hanger levers disposed von opposite sides of the closest portions of said wheels and >to the right,~the levers | 61 rotate about the pivotal pivotally attached at one end to the vehicle and connection between these leversand the associat-V ` provided at the otherrend with a brake shoe which ed brake heads 3|, and thus move the levers | 81 in Y is adapted to engage one of said wheels, a. second a counterclockwise direction about the pins 231 on pair-ofîhanger levers disposedon opposite sides which they are supported from the' locomotive of saidwheels and pivotally'V attached to thelevers frame. On >the movement of the levers |81, the of said firstrpair 'and provided at Vone end with a "30 brake shoes 30'c‘arried by these levers are moved brake shoe which is adapted to engage the other into engagement with the wheels 3, and- on the 'Y wheel, and.> means' connected Vwith the levers of completion of the movementof the brake beam 6 said second pair at `the ends opposite tothe to its brake applying porsitiomthe shoes 30 and 32 associated shoe for actuating the levers -of -both are ñrmly pressed _against the Wheels 3 and` 2, pairs to press the shoes into engagement with said = Upon further movement of the brake beam‘B Y _ respectively. ‘ AVThe movement of the brake beam Stoits brake applying position acts through >the hanger levers ~ 'I6 and `I8Y to press the brake‘shoes 25 and 22 against the wheels 2 and |, respectively„in’ the 2. Inra. brake mechanism'for a vehicle having a plurality of pairs of vwheels located `closely to gether to >facilitate negotiation of curves by'the vehicle, a first pairof hanger levers disposed on same manner that Vthe movement of the brake 5 opposite sides ofthe nearest portionsof two ad - beam 6 to its brake applying position acts through jacent lwheels at one side of thevehicle and piv the hanger levers |61 and |81 t'o press the Vbrake ' otally attached at one Yend to the vehicle and pro shoes 30 and 32 Aagainstthe'wheels'3'and2. ` »vided at'the other ena with a brake snee which is Themovement of the brakebeam 4 to its brake ' adaptedto engage one of saidtwo adjacent wheels, v applying >position causes the`> associated» hanger a- second pair of hanger leversv disposed on op' levers 8 to rotate in a counterclockwisel direction, and hence causes the brake shoes v|| to become posite sidesof the contiguous portions lof said two >adjacentwheels Vand pivotally attached to the pressed It will against. be seen,the therefore, wheel |.that lwhenY - Y fluid . . pres ' levers of saidvñrst pair and provided at one end with a brake shoe which is adapted to engage the otherof said twoadjacent Wheels, a brake beam sure is supplied to the brake cylinders C', all of the brake shoes are pressed-against'the wheels, and the action of the brakemechanismfis lsuch that a substantial force effective to press any of lthe shoes against the wheels willnot be developed until all of the shoes have been moved inte en gagement with the wheelswith which they are associated, and thereafter the kforce effective to pivotally connected with the levers of said second pair at the endsvopposite to the associated shoes, and vmeans for movingk said brake beam between ,brake applying and brake releasing Apositions to vactuate the levers of both pairs. Y s ' ç> 3. Inra brake mechanism for a vehicle having a. plurality of pairs of‘wheels llocated closely to gether to facilitate'negotiation of curves by the press each of the shoes »against'the' associated wheel is approximately the same. `This-"insures that substantially the same braking'effort will be developed on each of the wheels of the locomotive. When the fluid supplied to the brake cylinders of the brake mechanism is subsequently vented, ’the release springs movethé push rods into the Y provided at the other end with a brake shoe which 65 is adapted to engage one of said two adjacent brake cylinders towtheir retracted positions, which Wheels, a secondpairV of hanger levers disposed on' vehicle, añrstpair of hanger levers disposed on 60 opposite sides of thecontiguous portions of two adjacent 'wheels on one side of the vehicle and pivotallyY attached at one end to the vehicle and movement releases the force tending to press the j opposite sidesv ofthe contiguous portions of said ` shoes against the wheels, and hence releasesthe two adjacent wheels and pivotally attached in termediate their ends to the levers of said ñrst pair 70 One advantage of brake mechanism embodying intermediate their ends and provided at one end brakes. s _ , ‘ . Y, my invention is _that since none îof the pivotal con- ~ with a brake shoe which is adapted to engage the nections for any of the brake hanger leversis lo `other of ' said two adjacent wheels, and means cated between thewheels, the minimum spacing ‘connected’ 76 winch must> be> provided «between ' the wheels is thel levers of said> second pair at the ends opposite to the associated shoe for ac 75 14 52,132,994 ' tuating the levers of both pairs‘to press the shoes into engagement with the associated wheels. ,4. In'a brake mechanism for a vehicle hav ing a plurality of pairs of wheels located closely together to facilitate negotiation Vof curves by the upper endsto "the,y vehicie and p'ròvided at their Y closest portionsof saidrtwo adjacent wheels, a above theV horizontal plane extending through Vlower ends with abrake shoe which is'adapted to engage one of said two adjacent wheels at a >zone >located below _the horizontal plane extend ing through ythe'axes of the wheels, a second pair vehicle, a first pair of. hanger levers disposed on ' of hanger-levers disposed on opposite sides of the opposite sides of the closest portions of two ad , contiguous portions of said two adjacent wheels jacent wheels on the same sid-e of the vehicle and and pivotally attached intermediate their `ends pivotally attached at their upper ends tothe ve to the levers of said first pair intermediate their f10 hicle and provided at vtheir lower ends with a ¿ends and provided `at rtheir upper ends ’with a 10 brake shoe which is- adapted to engage the tread brake'shoe which is Aadapted to engage the other of one of said two adjacent Wheels below the of said two adjacent wheels at a zone located second pair Vof hanger levers disposed on opposite . the axes of the wheels, and means connected with sides of the closest portions of said4 two adjacent l'wheels and pivotally attached intermediate their ends to the levers of said first pairintermediate >their ends and provided at their upper ends with a brake shoe which is adapted to engage the tread A:20 -ofitheother of said two adjacent wheels above the -closest-portions >of said two adjacent Wheels, and means connected -with the levers Yof saidsecond pair at their lower ends for actuating the levers of both pairs to press saidbrake shoes into ven gagement with the associated wheels. the levers of said second pair at their lower ends for actuating the levers of both pairs to press said brake shoes‘into engagement with` the asso ciated wheels. ‘ì . ¿ _ 8. In a'brake mechanism for ajvehicle having at least one pair of wheels, two'brake beams ex tending transversely of the vehicle ‘on opposite sides of said pair of wheels below the horizontal planel passing through their axes,V two hanger levers ‘one located at each Vside of the vehicle - and each comprising an upwardly extending arm .25 secured at itszlower end to a shaft journaled in the locomotive frame. and aV depending arm se 5. Ina brake mechanism for avehicle having a plurality of pairs' of îwheelsr'located closely to gether -to facilitate negotiation vof curves by the vvehicle,'a first pairîof hanger levers disposed on cured to said shaft-at the rend opposite to said upwardly extending arm, each said upwardly'ex loppositel sides of the'closest portions ofV two ad jacent Wheels on thesame snideV of the vehicle >and Vtending arm being providedwith an offset por tion which extends into the'plane of the associ pivotally attached ‘at their upper .ends vto-»the vehicle and provided at, their lower ~ends with a ated wheelV at one side thereof above the axis of So the wheel and which carries a brake shoe for en gagement with the associated wheel, j and said ,brake shoe ,which is adapted Jto-'engage the tread of one of said two adjacent wheels,v a second pair of hanger levers disposed between the levers of said first pair and said two adjacent wheels and pivotally attached intermediate: their ends tothe levers of said ñrst pair intermediate .their ends downwardly extending arms being pivotally se 35 cured to the opposite ends of one of said brake beamsin supporting relation thereto, other brake shoes disposed on the Vopposite sides of said wheels from the shoes connected with'said hang er levers fand Voperatively connected withv the 40 and provided at their upper ends with` a brake v 24o sho-e which is adapted to engage the `tread of the other brake beam, and means for actuatingysaid other of said two adjacent wheels, and means con- ' brake beams to cause. said brake .shoes to fric nected with ’the levers of said second pairat their tionallyengage the associated wheels. lower ends `foractuating the levers Aof both pairs'V vto press said -brake shoes into engagement with the associated wheels. . ' gether to facilitate negotiation of curves by the » Y to ` tending transversely of the vehicle on opposite sidesof‘said pair of wheels below the horizontal planepassing through their axes, `two hanger le , 6.`In a brake mechanism for a vehicle having a plurality of pairs of wheels located closely to 55 ' ` 9. In a brake mechanism for a vehicle having at least one pair of wheels, two brake beams ex vers one located at each side of the vehicle and vehicle, a first pair Vof hanger levers disposed on opposite ‘sides of the closest portions of two ad `each comprising an upwardly extending arm se jacent wheels and pivotally attached'at one end to the vehicle and provided at the other end with a brake shoe which is adaptedto engage the the locomotive frame and a depending arm se tread of one of said two adjacent wheels at a zone located below the horizontal plane extend ing through the axesïof the Wheels, a second pair >of hanger levers disposed on opposite sides of the closest portions of saidmtwo adjacent wheels and pivotally attached tothe levers of said first cured at> its lower end to a shaft journaled in cured to saidl shaft at the end opposite to said upwardly extending arm, each said upwardly ex tending arm beingrprovided with an offset por tion which extends-into the plane of the associ ated wheel at one side thereof above the axis of the wheel and which carries a brake shoe for ' engagement with'the associated wheel, and said downwardlyextending arms being pivotally se 60 .pair and provided at one end with a brake shoe cured to the opposite >ends of one of said brake which is adaptedV to engage the tread of the other of; said two adjacent ~wheelsçat- a zone‘lo ycated above the horizontal plane Vvextending beams in supporting relation thereto, other brake shoes .disposed on the opposite sides of said wheelsV from the shoes connected with said hanger levers >and'operatively connected with the other brake beam,7and meansy for simultaneously actuating through the axes of the wheels, and meansv con nected with ’the levers- of said second pair at theirlower ends for actuating the ‘levers of both said one brake beam away from said one pair of ¿pairs to press said Ibrake shoes into engagement ' wheelsand said other brake beam toward said with _the associated wheels. ’ Y one pair of wheels to cause said brake shoes to .70 , 7*. Ina brake mechanism for a vehicle having i frictionally engage the associated wheels. Y 70 a plurality of pairs of wheels located .closely‘to 10. In a brake mechanism for a vehicle having gether to facilitate negotiation of >curves bythe at least one pair rof 4wheelatwo brake beams ex- `l Y vehicle, a first pair of hanger levers disposed on tending transversely o'f the vehicle on opposite «opposite sidesrof rthe closest Vportions ofv two `ad sides' of saidv pair of Wheels below the horizontal jacent wheels‘ and pivotally attached at. their plane passing throirlghntheirY axes, tworhanger 2,132,994 levers one located at each side of the vehicle and each comprising an upwardly extending arm se cured at its lower end to a shaft journaled in the locomotive frame and a depending» arm secured CR to said vshaft at the end opposite to said up wardly extending arm, each said upwardly ex tending arm being provided with an offset por tion which extends into the plane of the associ ated wheel at one side thereof above the axifs of 10 the Wheel and which carries a brake shoe for en 5 shoes disposed on the opposite sides of said wheels from the shoes connected with said hanger levers and operatively connected with the other brake beamytwo ñoating levers connected at one end with said one brake beam at points equally spaced Ul from its e'nds and at the other end with said other brake beam at points equally spaced from its ends, ythe point of connection of each floating lever with the one brake beam being at the op posite yend of the beam from its connection with 10 the other beam, and means for actuating said floating levers connected with said ñoating levers gagement with the associated Wheel, and said downwardly extending arms being pivotally se cured to the opposite ends of one of said brake intermediate their ends. beams in supporting relation thereto,` other brake r EMIL G. MUELLER.