US1457215A - Rail-straightening press - Google Patents

Description

y.1. s. DAYTON RAIL STRAIGHTENING PRES S Filed Dec.

13 1920 l0 sheets-sheet 1 l) fame/6 Bap/ton NVENTBR ATTORNEY WITNESS:

May 29, 1923.

WITNESS:

J. S. DAYTON RAIL STRAIGHTENING PRESS Filed Dec. 13 1920 lO sheets-sheet Jam@ e5 5( Hay ton I NV ENTOR ATTORNEY May 29, 1923. 1,457,215

- l -J. SHSDAYTON RAIL 'STRAIGHTENING PRESS WITNBS: ATTORNEY May 29, 1923.

J. S. DAYTON RAIL STRAIGHTENING PRESS Filed Dec.

1920 lO sheets-sheet 4 darne/6* 5. [20g/ ton INVENTOR ATTORNEY May 29, 1923.

J. S. DAYTON l RAIL STRAIGHTENING PRESS Filed Dec. 13. 1920 lO Sheets-Sheet 5 ATTORNEY W TNESS:

May 29, 1923.'

J. S. DAYTON RAIL sTRAlGHTENING PRESS Filed Dec. 13. 1920 l0 sheets-sheet 6 cam es 5( Zag/2am ATTORNEY WITNES;

Maly 29, 1923.

J. S. DAYTON RAIL STRAIGHTENING PRESS Filed Dec.

13 1920 l0 sheets-sheet 7 e. QQXJQA,

ATIDRNEY May 29, 1923. 1,457,215

Y .1.l s. DAYTON RAIL STRAIGHTENING PRESS ,Filed Dec. 13. 1920 l0 sheetssheeb 8 y Q w iQ-WGW' I i May 29, 1923. I 1,457,215 J. s. DAYTON RAIL STRAIGHTENING PRESS Filed Dec. 13 1920 l0 sheets-sheet 9 INVENTOR WITNESS:

AITORNEY May 29, 1923.

J. s. DAYTON RAIL STRAIGHTENING PRESS lO sheets-sheet 10 Filed Dec. 13 1920 Q BY 'S @MW-,w

ATI'ORNEY WITNES:

Patented Mey 29, 1923.

JAMES s. DAYToN ,oF cUiviBiiRLAivn,.iliAieYLANn.f-`- i i RAIL-STRAIGHTEING Penses." i

` Appiieatien'iiied December 12,1920. serieu ne,430,298.:, ,A i

T o @ZZ wh om t may` concern ,d Be it known that I, Jaynes S.l DAYTON, citizen of the United States, residing at Cumberland, in the countyl of Allegany and State `of Maryland, have invented new and useful *Improvements in a Rail-'Straightening Press,4

, of lwhich the following is a specification.

This inventionrelates to a railstraightening press, and the Objectis to straighten steel"` rails asthey are passed between the rolls off a series,y mounted as herein indicated, in order that Vahy portion of a rail which is* vWarped r deflected from .proper alinenient,

maybe placed underlthat degree of pressure required to rest-ore it to correct position.

A further object isto lprovide means for effecting.A the above mentioned result and applying the correct degreeofl pressure by means automatically controlled, so that the resistance offered bv the rail to the pressure members may determine the .pressure to be f l rail to be straightenedis ed,la"plu'rality of 'pressure elements positionedto engage-said appliedin correcting :the error.

A still further object is to provide a straightening element `or elements including a Vpressure device under pneumatic cont'rol, the degree of pressure to be applied in straightening a rail being deterinined'by thel pressure exerted 'on abody of oil Within a 'cylinder the vplunger of'which is acted upon bythe rail or the deiiected'portion thereof,

an additional plunger `being Vunder pneumatic control and forced into engagement With the Work under pressure determined' in the manner indicated.

l A still vfurther object is to provide a -miaXi` mum air pressure to be reduced iautoinatically to. a degree determined by the pressure on thebody of oil. Y e

A still further object is toprovide controlling valve mechanism lcomprising a prie mary valve and valve chest, an intermediate valve and valve chest, and an upper valve,

vand casing therefor, the pressure on the body ofl oil Withinv the cylinder before mentioned being manifested in thelpriniary. valve chest and operating the valve therein for admit-v ting` air to theinterinediate -valve chest and opei'atingthevalvetherein, the valve last named admitting airipressure to the .upper chest from Which itis dischargedy to the pneumatic cylindercontrolling the pressure element directly contactingA With'thevrafil to be straightened.

A still further object is to providein coiinection 'with' theupper or third valve chest,

" .In the draiviiigs:

` a blowoif valveautomatically controlled, yso that the `pressure .isfreducedifrom a ..maxiinuin ofjs'ayftvvo hundred *poundsto the pressure"required to correct a given error "called lslip 'valve yfor,restoringthe' intermefdiate valve, by air pressure, t'o normal position'. n Y fier still vfurther object'i'is toprovide mean-s for maintaining the pressure'in theiivpper Y or`v third valve'` chest, f after ythe requiredgpressure has been determined, andsimultaneouslyrcutting ott an "oilr'co'nnection i fr'om'fthe chamber of the intermediate valveWith the lco'ri'espoiidiiig chamber of `.the intermediate valve ot anotlier pressure element. y f fr still urtherobject is to provide "afpluf rality of pairs of rolls :between vvhich the" rail Afrom opposite directions, and `I'n'eansauftomatically controlled for applyingY pressure to the rail in oppositedi'r'ectionaby pneu-` matic devices autoii'iatically controlled in the inai'ineijv indicated(- plan v'ievv" of the` pres/s:

` rFigure lv is a top Figure QI is an'fend eleva-tion, illustrating the means for impartingmovement: to1 the rolls from the motor shaft.'

:urelulv v iA f Figure 4 is a view partly in yvertical section, With portions inelevationas' theyfivould appear lookingv from the right injFigurev 1. l' Figui-e5 is a vien7 in elevation and'secti'on,

showing the 'valve' mechanism Labove' vthe pneumatic cylinder. cylinder` at'the right. Y

Figure 6 is a view shovving 'aportion :of

.thevalve 'mechanism in' top 'plan' and showing the Iupper valve chest iii'longitudinal sec-. tion. l l,

` Figure mediate valve chest' and primaryval'vefchest in longitudinal section, and alsoi'shovviiig in section the casing ofthe valve by Whichv the pressure is reduced froni'the maximum to that degree required' to .eiiect the vcorrection oic a given errorinfa rail. y y

Figure` 8 shows thefoil cylinder jin .end

elevation and `ab'ove-that cylinder thevalve von` the left `and the oil i' 7 'is a view showing theintere mechanism, the primary `valve kbeing in longitudinal section..

Figure 9 is a vertical section through the upper valve and the intermediate valve chest, they intermediate valve being in start-k imoved to operative position.

Figure 11 is a vertical section through the upper valve chest and the intermediate valve chest, both of the valves having moved v7,to operative position.

Figure 12 is a detail in section on line ,V 12-12 of Figure 6.

Figure 13 is a detail in longitudinal section through the slip valve, operating on the stem of the intermediate valve for admitting air to return the intermediate valve to normal position.

The rails to be straightened are passed between rollers arranged in pairs, as shown particularly in Figures 1 and 2. One roll Y of each pair is stationary, being designated 10, and having its circumference provided with a broad flat groove for engaging the vflange of the rail. The opposing roll 12 is provided with a groove 13 for engaging the head of the rail, and the roll 12 is movable -.toward the Work under air pressure applied through the mounting means. This roll is mounted in a cross head 14 operating in guides 15 and being controlled by a plunger 1,6 operating in a pneumatic cylinder 17, the

air feed to this cylinder being under the direct control of an operator. Two sets or pairsof rolls 10 and 12 are shown in Figure 1, yand movement is imparted to the rolls through the gearing shown in Figure 4 and elsewhere. A worm shaft 2O carries a bevel gear wheel 21 meshing with a gear wheel 22 on a shaft 23 carrying a gear wheel 24. This wheel 24 meshes with a pinion 25 on the shaft 26 of a motor 27 shownV in Figure 1.

Meshing with the worm shaft 20 are worm wheels 28, 29, 30 and 31 keyed to vertical shafts 33, 34, and 36, the lower ends ofl Vthese shafts being mounted in thrust bearings. The movable rolls 12 are mounted on stub shafts 35 connected by a shaft member 36', having universal movement with the vertical shaft in alinement or approximate alinement with the axis of the roll to be driven. i The rolls 10 are rotated through yshafts 42 and 43 each carrying a worm wheel 44 or 45 as the case may be and having connection witha shaft sectionl45a, permitting universal vvmovement, in the manner shown in Figure 3. The rolls of the presses Manara operate or rotate in cross heads 44 and 45 .movable in guides 46and eachhaving connection with a plunger 48 operating in a pneumatic cylinder 50, this plunger operating under air pressure automatically controlled in the manner to be described below.

The'piston rod 49 also carries a plunger 51 movable in an oil cylinder 52, and the pressure exerted on the body of oil is proportional to the pressure produced on the press roll 41 when the slightly bent or deected portion of a rail engages the roll last named. This' pressnreon the body of oil is manifested in one of the chambers of the, valve mechanism and servesto determine the degree of air pressure applied to the pneumatically controlled plunger for correctingl the error in the rail and straightening the latter.

the oil chamber of the primary valve' chest 61. The oil exerts pressure on valve 62 and moves the valve toward the right in Fig. 10 and elsewhere, causing the valve element 63 on valve stem 64 to open a port 65,

permitting air to pass from the intake ,66'

through the valve chest and thence intoair duct 67 lea-ding to the space at the left of the intermediate valve chest 68, with, the result that the intermediate valve 70 kis moved to a position for permitting air to pass to the upper" or third valve chest designated 71. Air entering at the left of upper valve 72 throws that valve to the right, and permits air to pass from inlet 73 to the outlet 74 of this upper valve chest, exhaust port 71 having been closed by valve 72, the air passing thence through air duct 75, casing 76, port. 77 to the pneumatic cylinder of the press. The air passing through the duct last named is under two hundred pounds pressure, the pressure being reduced automatically to the pressure required at a given time, by means `of fthe valve 80. This valve controlsthe port 81 and a spring 82 tends to hold the valve tol seat.

' The stem S2 of valve 8O carries a plunger V83 operating` in a chamber or cylinder 84 which has communication with an air inlet 85. This inlet, is under the control ofv a valve 87, automatically controlled, as indicated, below, and the inlet mentioned is in communication with air duct 67, as indicated in Figure 12. yThe valve may be adjusted by varying the tension of the spring, adjusting sleeve 88 and nuts 89, permitting of the operation. Assuming that the valve 80 is set to open at a pressure below the initial pressure of 200 pounds" but sufficient toovercome the resistance offered vby the warped rail, it will be apparent that the pressure in the casing 76 will be reduced accordingly before the air enters the pneumatic cylinder.

One of the especially important features of the invention is the control of the valve 80, and this is effected automatically, since the valve is set in the manner indicated but is further subject to the air pressure below the plunger 83 on the stemkof the valve 80. This pressure is in turn determined by the pressure in the primary valve chest, in 'n view of the connection between the air duct 67 and the primary valve chest, the extent to which the port 65 is opened depending upon the oil pressure at the left hand or inlet end of this valve chest. As previously explained, the oil pressure is proportional to the pressure exerted on the movable elements of the press, incident to the bent or deflected portion of a rail.

lt will be observed, therefore, that the del'gree of'air pressure required for straightening a given portion of the rail, is determined automatically bythe initial pressure .exerted on the movable element of the press as the result of the distortion of the rail.l The spring of the regulating valve '80 is under aminimum compression corresponding to a pressure in the pneumatic cylinder equalling or slightly exceeding the elastic limit of the rail. This minimum compression is controlled by nuts 89.k An adjusting sleeve 88 limits the maximum pressure, being engaged by a fixed collar 88 on the valve stem.` The valveor cock 87 'is closed at the proper time vas 'indicated below, in order to prevent the relief of pressure in the oil cylinder 52, ,during the working stroke, from altering or a'ecting, the pressure controlling valve 80. The control of the valve 87 is effected through the operaltion of the upper valve,.and will again be referred to.

Another important feature of the'invention is the equalizing springs 90 of the primary valve 62, the function of which is to permit; of the openingof ythe port to such an extent that the pressuregon the inteimedi'ate valve will be proportional to the cill pressure in the valve chest 61.

The right hand ,end of the intermediate valve chest 68 is connected by a pipeV9l, under the control of a valve 92,l with the vother press, the valve 92 being controlled by the upper valve 72. Vhen the. upper valve moves to operative position, that is to the right, the valve 92 is closed, sothat `there will be no interference, by the other press, with the operation of the intermediate valve of the`l` ress under consideration.y VA spring held trip 94 on thestem 95 of thel upper `valve throws the arm 96 of the valve 92,'for

the purpose indicated. A spring held trip 97 on the other end of `this valve stemA cooperates with an arm 98 on the stem ofthe valve 87, for ,a like purpose. -l

Referring further to the operation of the intermediate valve, and to Figures 7 andV 10, air inlet ports are shown at 101 and "102 and an exhaust port 103 is located as shown.

Ports 104 and 105 permit air to pass to they upper cylinder or valve chest 7l.v The stem of the intermediate valve carries four valve elements and the oil piston 106V is' acted* upon by the pressure of oil from the other press when the valve 92 is open. In order to return the intermediate valve to lnormal position afteroperatiom we provide a slip valve 110 comprising three disks 111 formed on a body 112 slidable on the valve stem.V These disks are provided vwith apertures 113L for 'the purpose indicated below. At the progperftime air passing from the duct 115, passes between the disksv and through the apertures therein,- against the oil piston 106, the end disk 116 on the valve stem beingalso apertured.

c Air passing from," the intermediate cylinder or valve chest 68 enters the upper' valve chest through port 120 and throws'upper valve 72 to the right, placing ,the lports 7 3 and 74 in communication, whereby air is.

permitted to pass through duct 75, casing 76, and thusto the pneumatic cylinder.

The press havingoperated under theair pressure in the-pneumatic cylinder,'exceed`- ing the `'elastic limit ofthe rail, the' pressure in the oilv lcylinder 52- isrelieved, Vand the primary valve returnedto "normal position Y Vunder the action ofthe spring 90.' rl`hev left 1 end of the Vintermedia-te valve chest is vopenl to the exhaust through port 65, andil air passes from intake 121 through the primary valve chest, duct vand theapertured disks of the slipnvalve 110, tothe right end `of the intermediate valve chest, `returning the intermediate valve 70 to normal position, and incidentally returning the slip valve 110.: Air is thenadmitted to the right` end of the upper valve chest 71, port124l having been held slightly open/by spring 125. The left end of the upper valve chest is open to exhaust port;.126, and the upper valve 72 returns to normal position'under air pressure, cutting off the air topneumatic further automatic operation in straightening another bend in theV rail. Exhaust ports 6,17 and 62 of cylinder 61 and exhaust ports 103 and '131 of the intermediate valve chest serve an obvious purpose, and Where desirable coil springs are located as shown to prevent the sticking of the valves. .ln the event ot' over travel of the plunger in the pneumatic cylinder, through accident, pressure inthe cylinder is relieved through the port L30.

The rail being operated upon travels through a guard member i235, oi channel formation, shown especially in Figures l and 3. Housing or b Xing elements lt appear in these views and elsewhere, and frame elements ot rectangular cross section are sliovvn at 138. liprings lijf), lett) return the plungers of the movable rolls to normal position. Elements lll serve to take up Wear in the guidevvays oli the crossslieads.

What is claimed is:

l. ln a machine of the class described, povver operated means for applying prersure to the Work. and means controlled by n the initial pressure of the vvorlr on an element o'l' the means irstnamed, and by the movement of said means, for controllingthe degree lot pressure to be vapplied through the power operated means.

2. 1n a machine of the class des ,ribech a pressureroll, poiveroperated means for applying pressure through said roll, and means controlled by the initial pressure ei:- erted on the roll by the vvorlr, and by a rctracted movement of said power operated pressure roll, for governing the operation .of the power operated means.

3. ln a machine ot the class described, a rail straightening pressure element, a tluid pressure device 'for imparting movement to the pressure element, and means controlled by the initial pressure exerted Acn the pressure element by the vvorlr, and by movement of said rail straightening element, for controlling the degree of pressure to be applied to the element first named.

4. In a machine of the class described, a rail straightening pressure element, a fluid pressure device for imparting movement to the pressure element, and a fluid pressure device for determining by movement ot said rail straightening element the degree of pressure to be applied through the A.fluid pressure device first named.

5. 1n a machine of the class described, a rail straightening pressure element, a tlui-d pressure device for imparting` movement to the pressure element, and means controlled by movement oli the rail straightening element for automatically determiningthe degree oit pressure to be imparted through the fluid pressure device, and including mechanism controlled by liquid pressure.

6. 1n a machine oit the class described, a rail straightening pressure element, a fluid pressure device 'tor imparting movement to the pressure element, and means controlled by movement of the rail straightening element ior determining bymechanical pressure and {iuid pressure the degree ot pressure to be applied to the elementrst named. T. ln a machine of the class described. a pressure element, a pneumatically operated plunger, means controlled therethrough for exerting pressure on a body of liquid, and

means responsive to pressure on the liquid plunger, means controlled therethrough for,

exerting pressure onza body of liquid, means responsive to pressure on the liquid for con trollingthe degree of air pressure to be applied to the plunger, said means last named including a `plurality of reciprocable valves.

l0. ln a machine of the class described, a pressure element, a pneuinatically operated plunger, meanseontrolled therethrough for exerting pressure on a body ot' liquid, means responsive to pressure on the liquid for controlling the degree oi'y air pressure to be applied to the plunger, said means last named including a plurality olslid'a-ble valves and a spring controlled regulating valve. l

ll. ln a machine of the class described, a pressure element, a pneumatically operated plunger, means controlled therethrough for exerting pressure on a body ot' liquid, air operated means responsive toy pressure on the liquid for controlling the degree of air pressure to be applied to the plunger, said means last named including a valve forreducing the maximum air pressure to a pretermined degree.

l2. In a machine of the class described, a pressure element, a pneumatically operated plunger, means controlled therethrough for exerting pressure on a body of liquid, air operated means responsive to pressure on the liquid for controlliA g the degree of air pressure to be applied to the plunger, said "means last named including a spring controlled and air controlled valve for reducing the maximum air pressure to a de- (free determined automatically by the character or" the vvorlr.

13. lna. machineJ of the class described, povver operated pressure elements and govering means therefor including a spring controlled andl air controlled valve 'for reducing the maximum air pressure to a degree determined automatically by the character of Vthe work.

14. 1n a machine of the class described, an element for applying pressure to the Work, and governing means therefor including a primary valve .actuated by-fluid pressure, a second `valve operated under fluid pressure and controlled by the valve first named, and a third valve Acontrolled'` by thesecond valveY and acting to' control the movement of the` element applying pressurey to the work.

15. In a machine of. the class described, an element for applying pressure to the Work, governing means therefor including a primary valve actuated by fluid pressure, a second valve operated under fluid pressure .and controlled the valve firstnamed,

third valve contiolled by the second lvalve and acting to control the movement oic thc element applying pressure to the vvorlr. and a regulating valve for reducing a maximum air pressure to the extent required 'for the character ofthe Work.

'16. In a machine of the class described. an

element for applying pressure to the Worx. governing means therefor including a primary valve actuated bytiuid pressure; a serA ond valve operated under' iiuid pressure and controlled b-y the valve first named. a third valve controlled by the second valve and acting to control the movement of the element applying pressure tothe Work, and a spring controlled and air controlled regulating valve forV reducing a maximum air pressure to the extent required for the character of.

the Work.

17. In a machine of the class described, an element for applying pressure to the Work,v

and governing means therefor including a mechanically controlled andl air controlled valve for reducing a. maximum air pressure to the ,extent required for the character' 'of the Work, and means for retaining the reduced pressure constant during the l operation of the element first named.

' 18. In a machine of the class described, a plurality of elements for applying pressure to the work from opposite directions, and

' governing means for each element including a valve for reducing a maximum air pressure to the extent required for the character of the Work engaged by one of the elements first named, and means for'rendering-the governing means associated with one of said elements applying pressure to the ivorlr, in`- operative, While the other of said elements is operating. n

19. In a machine of the. class described, a pressure element, aseco-nd pressure 'element movable ina direction opposite to that first named, means automatically operated for governing the operation of each pressure element and preventingV said elements froml acting simultaneously', said means including plungers and devices permitting, and at times preventing, thefflow of fluid between the plungers. i Y

20. The combination with a press, of a ysecond press movable in a direction opposite' to that'first named,and means automatically operated for governing the operation of each press and preventing the lpresses from acting simultaneously, said means last named including a. cylinder associated with each vpress and 'adapted' to receive a body of oil, an oil plunger vforeach cylinder, and means forplacing said cylinders in communication. Y l

21. In va'machine of the 'class described, an element nfor applying pressureto the* Work,

Vand governing means therefor including 'a' primary 4valve and any ecpiializingspring.v therefor,` said valve being actuated by air pressure,-'a vsecond valve operated by air pressure and controlled by the valvefirst named, and a third kvalve controlled bythe second valve andacting to controlthemovement-of the element applyingfpressuretothe Work. n" .'L.

22. In a. machine' of the classdescribed,l an element for applying` pressure to the Work. and governing means set in. operationby the movementV fof the element-applying" pressure and including aprimary valve acl' tuated by fluid pressure," an -equalizing spring lfor said valve, and devices directly 'controlled' byr saidVV valve for governingthe movement of the element' applying pressure L to the Work. Y i f 1 "723. vIn a' machine*oftheclass'V described,V

an element for applying pressureto the Work, and governing means set'in operationv by the movement of the'element applying pressurel and including 'an adjustable spring v held valve and pneumatic-and automatic means' controlling said valve and determin ingfthe'mpressure- 'acting upon `the lelement, lirstnamed; I

124.111 a machine of the class described, an y Work and governing means therefor .include ing a ,primary valve, aA second valve 'con'- trolled by the valve iirst l named,` a. vst`em`forthe'secondvalve, afslidable valve member on ,the stem and admitting air lpressure for returning'tlie second valve 'to normal posi-l tion, anda third valve 'controlled bythe sec?v ond named valve and directly determining the pressure under Which the element first named is operated.

26. In a machine of the class described, an element for applying pressure to the work, and governing means therefor includlng` a primary valve actuated by fluid pressure, a second valve operated under fluid' pressure and controlled by the valve first named. a third valve controlled by the section.

27. In a machine of the class described. a plunger operating under air pressure, and valve mechanism for controlling the pressure of air on the plunger and including a fluid operated valve, a stem-therefor,` and a second valve member slidable on the stem and *having apertures therethrough, means for .admitting air throughithe second valve member for returning the yvalve first-named to normal position, and means controlled by the valve iirst named `for determining the pressure applied to the plunger.

28. In a machine of the class described, a plunger operating under air pressure, and valve mechanism for controlling the pressure upon the plunger and including a fluid operated valve, an equalizing spring therefor, a secondV valve, an auxiliary valve for returning the second valve to normal position under air pressure, an additional valve controlled by the second named valve, and a regulating valve for reducing a maximum air pressure to a predetermined degree.

29. In a machine of the class described, a plunger operatingI under air pressure, valve mechanism forvcontrolling the pressure upon the plunger, 'and including a fluid operated valve, an equalizing spring therefor, a second valve, an auxiliary valve for returning the second valve to normal position under air pressure, an additional valve controlled by the second-named valve, a regulating valve for reducing a maximum air pressure to a predetermined degree, said regulating valve acting under the influence of a resilient device and under air pressure-determined by the valve first named.

30. In a machine of the class described, a .plunger operating under air pressure, valve mechanism for controlling the pressure upon the plunger and including a iuid operated valve, an equalizing spring therefor, a second valve, an auxiliary valve for returning the second valve to normal positionunder air pressure, an additional valve controlled by the second-named valve, a regulating valve for reducing a maximum air pressure toa predetermined degree, and means controlled by said additional valve ,for rendering the regulating valve inoperative after the beginning ofthe Working stroke of the plunger.

31. A rail straightening press, comprising pressure elements for engaging a rail from opposite directions, and automatically controlled fluid pressure mechanism causing one of saidelements to act to the exclusion of the other said automatic control including ducts and valves governing the iow of fluid between portions of the {iuid pressure mechanism.

32. A rail straightening press, comprising a plurality of pairs of-rolls, the rolls of each pair engaging a rail from opposite directions,` a plurality of pressure elements for eugaging the rail between saidv pairs kof rolls, and automatically controlled fluid pressure mechanism causing one of said pressure elements to act to the exclusion of the other said automatic control including ducts and valves governing the kflow of'fluid between portions of the fluid pressure mechanism.

33. In a device of the class described, a plurality of pairs of rolls, the rolls of each pair engaging the rail from opposite sides, and one roll of each pair being movable bodily toward the other, pneumatic means for effecting said movement, and pressure rolls for engaging the rail from opposite directions and between said pairs of rolls.

34. In a device of the class described, a plurality of pairs of rolls, the rolls of each pair engaging a rail from opposite sides and one roll of each pair being movable bodily toward the other, pneumatic means for effecting said movement, and automatically controlled pressure rolls for engaging the rail from opposite sides, between said pairs of rolls.

35. In a device of the class described, a

plurality of pairs of rolls, the rolls of each pair engaging a rail on opposite sides and one roll of each pair being movable bodily toward the other, a worm gearing for imparting movement to the rolls, pneumatic means for effecting the movement of one roll of each pair toward the other, and pressure rolls for engaging the rail on opposite sides between said pairs of rolls.

36. In a device of the class described, a worm shaft, driving means for the shaft, a plurality of pairs of rolls, a shaft for driving the rolls. gearingfor imparting movement to the shaft last named from the worm shaft, one roll of each pair being bodily movable toward the other, and a flexible connection permitting such movement with reference to the shaft driving the rolls.

In testimony whereofl aflix my signature.

JAMES S. DAYTON.

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