US1350057A - Rolling-mill - Google Patents

Description

F. B. BELL. ROLLING MILL. APPLICAHUN FILED AuG.7,1915.

F. B. BELL. ROLLING MILL. APPLICATION FILED AUG.7, |915. RENEWEDVIULY 9,1920. 1,350,057. v

Patented Aug. 17, 1920.

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@neas F. B. BELL,

ROLLING M1141.

APPLICATION FILED AUG-7,1915. RENEL 731.1%; "OdAAig 179 1920y I ZZZZnQSSQ-S! F. B. BELL.

ROLLING MILL. APPLICATION FILED AUGJ. I9I5. RENEWED IuLY 9. I920.

Patented Aug. 17, 1920.

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ROLLING MILL. APPLICATION FILED AIIGJ, I9I5. IIENEwEn IIILY 9. I92o.

Patented Aug. 17, 1920.

5 SHEETS-SHEET 5.

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UNITED STATES PATENT OFFICE.

FRANK B. BELL, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO EDGEWATER STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN SYLVANIA.

ROLLING-MILL.

Application led August 7, 1915, Serial No. 44,256'. Renewed July 9, 1920. Serial No. 395,173.

To all whom t may concern:

Be it known that I, FRANK B. BELL, a citizen of the United States, residin in Chicago Heights, in the county of ook and .State of Illinois, have invented a new and useful Improvement in Rolling-Mills, of which the following is a specification.

This invention relates in general to rolling mills and has more particular reference to rolling mills provided for the rolling of large and heavy metal disk and annular bodies, such as, for example, railway car wheels, tires for railway locomotive wheels, turbine rings, gear rings,crusher shells and the like. Although the invention is hereinafter described in connection with the rolling of railway wheels and tires, it will be manifest as the invention is better understood that itl has a more general application.

A principal object of this invention is the provision of a mill of the character described which may be used with slight and simple adjustment and through the substitution of a minimum number of parts for the rolling of both disk and annular bodies, thereby adapting such a mill for car and locomotive wheels. I

A further and decidedly important object of this invention is the provision of a mill which will accurately roll solid steel rail-A way car wheels and which is constructed and arranged to minimize the amount of preliminary work that must be done upon the blanks or blooms before 'they are placed in the mill. l

A further object of the invention is the simplification of the structure of wheel rolling mills and the elimination of all delicate and readily damaged parts.

A further object of the invention is the provision of a rolling mill of the character described which will have a wide range of adjustment, thereby enabling the same mill to be used in the production of articlesv of general cylindrical form but having widely different thicknesses or lateral widths.

A further object of the invention is the provision of a mill of the character described wherein the operator will have a better controlof the mill to produce accurate dimens' sioning of the articles than has been possible prior to my invention.

Y Other objects and advantages of the invention will be apparent as it is better undjerstood` from the 'followiing description when considered in connection with the accompanying drawings which illustrate a present preferred embodiment of my invention and show a mill embodying it arranged for the rolling of both car wheels and locomotive tires.

Referring to the drawings,

Figure 1 is a central sectional'view taken through a rolling mill embodying my invention and showing the same arranged for the rolling of locomotive tires;

Fig. 2 is a horizontal section of the same;

Fig. 3 is a view similar to Fig. 1 and showing the mill arranged for the rolling of a railway car wheel; I

Fig. 4: is a top plan view of the mill as arranged in Fig. 3 with parts removed to b etter disclose certain features of construction;

Fig. 5 is a section taken substantially on the line 5 5 of Fig. 3;

F ig. 6 is an enlarged detail view showing certain features of construction to be later described;

Fig. 7 is a section taken substantially on the line 7-7 of Fig. 6; and

Fig. 8 is a section taken substantially on the line 8-8 of Fig. 2.

For the purpose of illustrating my invention I have shown on the drawings so much of a rolling mill as is thought to be necessary to an understanding of my present invention.

Considering iirst Figs. 1 and 2 which show the mill arranged for the rolling of tires, it wil-l be noted that a shaft 11 is mounted in suitable bearings 12 and 13 and carries a bevel gear 14 which is in constant mesh with a bevel gear 15 fixed upon the end of a horizontally extending shaft 16. The shaft 16 is mounted in suitable bearings 17 and 18 and during each operation of the -rolling mill is continuously driven from any suitable source of power (not shown). The shaft 11 carries at its upper end a roll 19 against which the body being rolled is held in rolling. This roll rotates about a fixed axis and when the 'mill is arranged for the rolling of annular bodies, such as tires for locomotives and car wheels Specification of Letters Patent. Patented Aug. 17, 1920.

and the like, a follower roll 21 mounted upon a shaft 22 secured in a support or bearing 23 is provided. The support or bearing 23 is mounted in a carriage generally designated at 24 which rides at its ends in horizontally extending ways 25 formed in the main frame 26 of the mill. These ways extend substantially from the right-hand end of the mill viewing Figs. l and2 to close to the roll 19. he carriage 24 is pulled by pressure toward theleft viewing these figures in order that the roll 21 may press rmly against the inner face of the tire or tire blank indicated at 27. This pressure is exerted through any suitable power, in the present instance being supplied through a pull exerted upon a plurality of rods 28.

A pair of rolls 29, one on each side of the roll 19, engage the outer face of the tire as it is rolled.v Each of these rolls is carried in a bell crank 31 pivoted at32 to a part 33 of the main frame. Rods 34 press these bell cranks in the direction of the arrows on Fig. 2 to bring the rolls 29 into pressure engagement with the outer face of the tire, the enlargement of the tire being accompanied by a retraction of the rolls 29 under a substantially uniform pressure.

In the present instance, four rolls 41, 42, 43 and 44 are provided to operate upon the tire approximately diametrically opposite.

the part engaging the roll 19. Of these rolls 41 and 42 are lixed on inclined shafts or stems 45.and 46 and bear against the side faces of the tire as it is rolled. These two rolls are of frusto conical shape With elements of them engaging the tire in substantial parallelism. In the present instance both they rolls 41 and 42 are positively driven. The lower roll 42 receives its power from the shaft 16. On this shaft a slidable bevel gear 47 is provided which engages a bevel gear 48 on the lower end of the shaft 46. The gear 47 has a bearing 49 affixed to a bearing 50 of the shaft 48 which is part of a movable carriage'51 which, like the carriage 24 of the roll 21, is engaged in its ends in the ways 25 of the horizontal sides 26 of the main frame of the mill. The upper rol1 41 of this pair of top and bottom rolls receives its power from a motor 52, electrical'in the present instance. The roll41 and the shaft 45 are also mounted on the carriage 51. The carriage 51 has an upwardly extending arch 53 beneath or through which the shaft 45extends.y This shaft-is carried in an elongated bearing 54 which is supported in a bearing support best seen in Fig.n Extending out from each slde of the bearing andimmediate its ends is a pair of trnnions 55 whichy have a pivotal connection in a slide 56 forming a part of the bearing support. The remainder ofthis bearing support consists, generally speaking, of an arch or yoke 57, Ithe lower ends of which are pivoted at 58 on the carriage. The bearing support is swung about its pivotal connection with the carrlage by means of a pair of positioning bearing support 'about its pivot. The slide.

56 may be moved toward and from the pivotal connection ofthe bearing support with the carriage through a shaft 71 carrying worm drives 72 which engage worm gears 73 mounted on the end of screws 74 which turn freely in bearings 75 through the top of the yoke 57 and which have a threaded engagement through the ends 76' of the slide 56. The-motor 52 is carried upon a support 77 which is fast to the bearmg 54 of the shaft45 so that movement of the shaft bearing carries with it the motor 52, permitting thereby a permanent gear connection 78 between the motor and shaft 45.

The mill shown on the drawings is readily adjustable to the rolling of tires and Y' `82 with the forward end of the bearing 54 is provided to exert necessary downward pressure on the roll when the roll is in operation. A positive and adjustable stop 83 is provided upon the upper end of the piston rod 84 of this mechanism to limit downward movement of the rollas the article attains desired size. If desired a second hydraulic clyinder 85 may be provided to counterbalance the weight of the parts.

To accomplish this the roll 41 is The two rolls 43 and 44 are carried in a I yoke 86 having a pair of bifurcated arms 87. A roll is mounted With its axis in vertical position between the ends of each bifurcated arm and these rolls engage the outer periphery or face of the body being lrolled. They are, in the present instance,

located one on each side of and close to the plane of the rolls 41 and 42, so that all four of these rolls work upon a sector of the vflange 94 beneath the recess The tire is thusblank. All four of these rolls extend beyond theedges defined by the top and bottom faces with the outer face of the body upon which they operate. This preventsthe formation of a fin or other imperfection. The rolls 43 and 44 in the rolling of tires, perform the dual function of preserving the rotundity and of guiding the constantly enlarging tire properly between the rolls 41 and 42. The yoke 86 is carried at the end of a stem 88 of a piston 89 which takes into a hydraulic cylinder 91 through which suitable pressure may be exerted by the rolls upon the blank. The cylinder 91 is mounted in the carriage 51.

As the tire enlarges the carriage is drawn back in the ways 25 in the main frame, hydraulic cylinders 92 being provided to control this movement. The rolls 19, 43 and 44 are provided with recesses 93 and the roll 19 carries an outwardly extending 93 to form a support for the blank. fixedly held in horizontal position during rolling and made to rotate in a smooth although cpnstantly enlarging path of movement. "It can be readily measured and the machine stopped when it has arrived at desired dimension.

Figs. 3 and 4 show the same mill with slight changes arranged for the rolling of disk bodies, in thepresent instance a car wheel being shown. The changes that have been made to change it from one form of mill to the other are the removal of the shaft 22 and the follower roll 21 carriedby it, and the substitution of rolls 101 and 102 for the rolls 41 and 42 used in the rolling of locomotive tires. The rolls 101 and 102 carry heads 106 for engaging back of the rim 103 of the wheel blank 104. The carriage in these figures is shown as moved closer to the roll 19 by reason of the fact that the car wheel has a less outside diameter than the tire for locomotive wheels shown.

in Figs. 1 and 2, and also by reason of the fact that it is-desirable that the rolls 101 and 102 engage backof the rim 103. In the rolling of car wheels the rolls 43 and 44 act as pressure rolls, and the close arrangement of the four rolls 101, 102, 43 and 44 permits the forcing of the flow of metal in the direction desired., The roll 19 is still positively driven and it together with rolls 29 being relatively fixed with respect to the frame, while the carriage 51 carrying the rolls 101, 102, 43 and 44 has a horizontal motion with respect to the frame, enables the operator to 1 control the increase -of diameter of the blank and the formation of the flange during operation. He may cause the flange to be formed without appreciable increase of -diameter of the wheel blank, or

he may cause the flange to be formed while the diameter is enlarging.

Prior to my invention the rolling mills in use have required the formation of a rough approximation of the flange or a part of the flange upon the blank before it is introduced into the mill. This has required that the dies doing the preliminary work upon the blank determine the outer face or periphery of the blank as well as the side faces. By reason of this fact the range of weight that a blank may have to permit it tobe used has been relatively restricted. The fact that the dies engage the outer face has prevented the formation of a blank having excess Weight to desired width or lateral thickness without change of dies, and has required the use of presses of tremendous power to bring the blank to the desired configuration with the partly formed flange. it is locked in the dies and the blank cannot be reduced to the desired thickness.

not necessary to use dies which confine the outer periphery of the metal. The bloom may be brought to general cylindrical form of approximately the desired weight and placed between dies which willsuitably shape and space, the side faces without 1nclosing the outer periphery. The presses may be of much less power. If excess metal be present it results merely in a larger diameter, which, if too much to comply with the specifications, can readily be reduced by machining.

Vhen the apparatus is operating upon car wheels or upon disks of other character the forming or reducing action occurs almost entirely within the relatively small portion of the apparatus included by rolls 101, 102, 43 and 44. When thus acting the rolls 29 and 19- merely guide the blank and cause it to retain the form given it by the reducing rolls 101, 102, 43 and 44. By appropriate manipulation of these four rolls during the rolling the sectional rim shape may be changed. vThe arrangement of the two rolls 43 and 44 close to and at the sides of the pair of rolls 101 and 102 permits the rolls to overlap in their action so that no fins form at the edge of the flange or at the edge of the'rim.

It will be manifest that the various parts of the mill may be of strong and durable construction and that the various adjust-r Where a mill embodying my invention is used 1t is its material advantages, the form hereinbe! fore described being merely a preferred embodiment thereof.

I claim:

1. In a rolling mill, means for removably holdin a roll for engaging the interior surface of a tire blank, rolls for engaging the rim of either a car Wheel blank or of a tire jblank, and means for removably holding `--rolls in coperative relation with sald rim engaging rolls for rolling a carv Wheel and also alternatively holding rolls in coperative relation With said interiorlyv engaging tire blank roll and With said rim engaging rolls to roll a tire.

2. In a mill for rolling disk and annular bodies, the combination of a pair of Working rolls for determining the thickness of the body being rolled, a roll engaging the outer circumferential face of sa-id body, and means for forcing said roll into Working relation With said body in the rolling of disk bodies and for holding it in vmerely guiding relation in the rolling of annular bodies.

3. In a mill for rolling annular and disk bodies, the combination of a pair of Working rolls for determining the thickness of the body being` rolled, a roll engaging the outer circumferential face of said body, and means for forcing the Work into Workin@r relation with said roll in the rolling of annular bodies and means for holding said roll in merely guiding relation in the rolling of disk bodies.

4;. In a rolling mill, the combination of a plurality of rolls arranged to give desired formation to a car Wheel body and arranged to simultaneously operate upon a relatively small sector of said body, and means for .positively driving a plurality of said rolls.

5. In a rolling mill, the combination of a plurality of reducing rolls arranged to give desired formation to a car Wheel body and arranged to simultaneously operate upon a relatively small sector of said body, and

driving means arranged to engage said body Without said sector.

6. In a rolling mill, the combination of ay pair of reducing rolls for operating upon the side faces of a disk body and arranged one above the other, and a reducing roll for engaging the outer face of said body, each of said rolls extending over the intersection of the outer face With the side faces.

7. In a rolling mill, the combination of a fixed roll vand a roll mounted to operate upon the side face of a disk body, a mounting for said last mentioned roll, a driving mechanism carried by said mounting, said mounting and driving mechanism and said roll being movable bodily With respect to said fixed roll.

8. In a rolling mill, the combination of a roll adapted to engage a disk or annular body, a shaft on which said roll is mounted,

a bearing for said shaft, and a normally inclined bearing support for said bearing in which said bearing is pivoted, and means for moving said bearing longitudinally of said bearing support.

9. -In a machine for rolling circular blooms, a frame, a carriage sliding thereon, a pair of positively'driven rolls mounted on said carriage With their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination with means for shiftin said carriage as the bloom increases in iameter under the action of said rolls.

l0. In a machine for rolling circular blooms, a frame, a carriage sliding thereon, a pair of rolls mounted on said carriage with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination With cooperating 85 peripheral forming rolls bearing against the periphery of the bloom adjacent the point of its engagement between said inclined rolls and closely adjacent the Working area of the latter. v

11. In a machine for rolling circular blooms, a frame, a carriage sliding thereon, a pair of rolls mounted on said carriager With their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination With coperating peripheral forming rolls mounted on said carriage and bearing against the periphery of the bloom adjacent the point of its engagement between vsaid -inclined rolls and closely adjacent the Working area of the latter.

12. In a machine for rolling circular blooms, a frame, a carriage sliding thereon,

a pair of rolls mounted on said carriage with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination with coperating peripheral forming rolls bearing against the periphery of the bloom adjacent but on opposite sides of the point of its engage'- ment between said inclined rolls and closely adjacent the Working area of the latter.

13. In a machine j for rolling circular blooms, a frame, a carriage sliding thereon, a pair of rolls mounted on said carriage With their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination vvith coperating peripheral forming rolls mounted on said carriage with freedom of movement relative to the inclined rolls irrespective of the movement of the latter and bearing against the periphery of the bloom adjacent th point of its engagement between said inclined rolls and closely adjacent the Working area of the latter.

14. In a machine` for rolling -circular blooms, a frame, a carriage sliding thereon,

a pair of rolls mounted on said carriage with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination with coperating peripheral forming rolls mounted on said carriage with freedom of movement relative to the inclined rolls irrespective of the movement of the latter and bearing against the periphery of the latter adjacent the point of its engagement between said inclined rolls and closely adjacent the working area of the latter, together with means for forcing said peripheral rolls against the bloom with regulated pressure.

15. In a machine for rolling circular blooms, a frame, a carriage sliding thereon, a pair of rolls mounted on said carriage with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination with coperating peripheral forming rolls mounted on said carriage with freedom of movement relative to the inclined rolls irrespective of the movement of the latter and bearing against the periphery of the latter adjacent the point of its engagement between said inclined rolls, and closely adjacent the working area of the latter, together with means for shifting said carriage and moving said peripheral rolls independently of each other.

16. In a machine for rolling circular blooms, a frame, a carriage sliding thereon, a pair of rolls mounted on said carriage with their axes inclined toward each other and adaptedto bear upon opposite faces of the bloom, in combination with independent means for driving each of said rolls.

17. In a machine for rolling circular blooms, a sliding roll carriage, a pair of rolls mounted thereon with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom,- one of said rolls being held at fixed inclination and the other being movable toward or away from said stationary roll during the working of the bloom together with means for positively driving both of said rolls.

18. In a machine for rolling circular' blooms, a sliding roll carriage, a pair of rolls mounted thereon with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, one of said rolls being held at fixed inclination and the other pivoted on said carriage whereby the latter roll may be approached and retracted from the fixed roll together with means for positively driving both of said rolls.

19. In a machine for rolling circular blooms, a sliding roll carriage, a pair of rolls mounted thereon with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, one of said rolls being held at fixed inclination, an auxiliary frame pivoted on said carriage,

and a pivotal mounting therein for the second roll.

20. In a machine for rolling circular blooms, a sliding roll carriage, a pair of rolls mounted thereon with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, one ofisaid rolls being held at fixed inclination, an auxiliary frame pivoted on said carriage, a yoke adjustable in said carriage and a piilfotal mounting for said second roll in the yo (e.

21.l In a machine for rolling circular blooms, a driving shaft, a gear sleeve slidable thereon and having a driving connection therewith, a sliding carriage movable lengthwise of the shaft and engaging said gear sleeve, a pair of rolls mounted in said carriage with their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, one of said rolls having a vdriving connection with said gear sleeve and being held at fixed inclination, the other roll being movably mounted on the carriage and having means for separating and approaching the same toward the fixed roll together with means for positively driving both of said rolls.

22. In a machine for rolling circular blooms, a driving shaft, a gear sleeve slidable thereon and having a driving connection therewith, a sliding carriage movable lengthwise of the shaft and engaging said gear sleeve, a pair of rolls mounted in said carriage with their axes inclined toward each other and adapted tobear upon opposite faces of the bloom, one -of said rolls having a driving connection with said gear sleeve and being held at fixed inclination, the other roll being movably mounted on vthe carriage and having means for separating and approaching the same toward the fixed roll, together with means for driving said movable roll.

23. In a machine for rolling circular blooms, a pair of rolls having their axes inclined toward each other and adapted to bear upon opposite faces of the bloom, one of said rolls being pivotally mounted to permit of the separation and approach of.

the rolls, and a. driving motor carried by said roll.

24:. In a machine for rolling circular blooms, a sliding carriage having a pair of rolls mounted thereon with their axes inclined toward each other, a frame for one of said rolls pivoted on the carriage, an adjustable mounting for the roll in said frame and means for swinging the frame on itsj pivot, for the purpose described.

25. In a machine for rolling circular blooms, a sliding carriage having a pair of rolls mounted thereon with their axes inclined toward each other, one of said rolls having a fixed inclination, a frame pivoted on the carriage and in which the other roll is adj ustably mounted to vary its inclination and means for swinging the frame on its pivot to bring said adjustable roll into register with the fixed roll.

26. In a machine for rolling circular blooms, a sliding carriage having a pair of rolls mounted therein with their axes inclined toward each other, a swinging roll cradle supported by said carriage an carrying one of said rolls, and a motor mounted on said cradle for driving said roll.

27. In` a machine for lrolling circular blooms, a sliding carriage having a pair of rolls mounted therein with their axes inclined toward each other, a swinging roll cradle supported by said carriage and carrying one of said rolls, and a motor mounted on said cradle for driving said roll, together with means on the carriage for swinging said cradle to lift and lower the roll.

28. In a machine for rolling circular blooms, a pair of forming rolls mounted on axes inclined toward each other and having head portions adaptedv to engage the oppo-l site faces of the bloom in advance of the body portions of the rolls, which bear upon the marginal portion of the bloom, said head 'portions preventing the inward displacement of the metal by the body portions of the rolls, in combination with peripheral rolls bearing against the bloom adjacent the forming rolls and against which the marginal portion of the bloom is outwardly pressed by the bodies of the inclined rolls together with means for pressing said inclined and peripheral rolls against the bloom simultaneously or in sequence or at independent, variable pressures.

29. In a machine for rolling circular blooms, a pair of coperating-rolls mounted on axes inclined toward each other and adapted to bear upon the opposite faces of the bloom, in combination with forming roll means bearing against the periphery of the bloom closely adjacent the working area'of inclined rolls, pressure means for causing the inclined rolls to `approach each other to l reduce the thickness of the bloom, and independent pressure means for forcing the peripheral roll means against the periphery of the bloom to shape the latter.

30.v A construction such as specified in claim` 29 in which the means for pressing the peripheral roll against the bloom is not only independent of the pressure means for applying the inclined rolls to the bloom, but variable during the operation of the apparatus.

31. In `a machine for rolling circular blooms, a pair of coperating rolls mounted on aXes inclined toward each other and adapted to bear upon opposite faces of the bloom, in combination with 'forming roll means bearing against thev periphery of the bloom closely -adjacent the working area of the inclined rolls, and means for applying pressure to the inclined rolls and peripheral roll means simultaneously or in sequence, as desired.

32. In a machine for rolling circular blooms, a pair of cooperating rolls mounted tion of a carriage, a roll carried by said carriage and adapted to operate upon .said body, and means for driving said last mentioned roll mounted on said carriage, said carriage being movable with respect to said fixed roll.

34. In a rolling mill, the combination of a roll adapted to engage a disk or annular body, a shaft on which said roll is mounted, a bearing for said shaft, a pivotally mounted bearing support for said bearing, and means for shifting said bearing toward and lfrom the pivotal axis of said support.

35. In a rolling mill, the combination of a roll adapted to engage a disk or annular body, a shaft onwhich said roll is mounted, a bearing for said shaft, and a pivotally mounted bearing support in which said bearing is pivoted, -both said support and said bearing having a pivotal movement in a vertical plane. l

36. In a rolling mill for rolling disk bodies, the combination of a pair of reducing rolls for operating upon the side faces of said body and having axes located in the same plane and inclined toward each other, and a pair of reducing rolls operatin upon the circumferential face of said bo y and having axes parallel to the plane of the axes of the first mentioned rolls and located adjacent thereof. r

37. In a rolling mill for rolling disk l bodies, the combination of a pair of reducing rolls for operating upon the side face of said' body and having axes located in the same plane and inclined toward eachother,l

and a pair of reducing rolls operatin upon the circumferential face of said bo y and having axes parallel t0 the plane of the axes of the first mentioned rolls operating upon the circumferential face of the body toward the center of the body.

38. In a rolling mill for` rolling disk bodies, the combination of a pair of reducing rolls for operating upon the side face of said body and having axes located in the same plane and inclined toward eachother, and a pair of reducing rolls operating upon the circumferential face of said body and having axes parallel to the plane of the axes of the first mentioned rolls and located adjacent thereof, and independent means for moving said pairs of rolls to change correeponding dimensions of said body.

39. In a rolling mill, the combination of a group comprising a plurality of reducing rolls located close together to operate upon and give formation to a Wheel rim, and a roll located diametrically opposite the center of said plurality of rolls to control the diameter of the Wheel during the formation of said rim.

4:0. ln a rolling mill, the combination of a group comprising a plurality of reducing` rolls located close together to operate upon and give formation to a Wheel rim, a roll located diametrically opposite the center of said plurality of rolls to control the diameter of the Wheel during the formation of said rim, and means for producing controlled relatively bodily movement of said plurality of rolls and said roll as the Wheel is formed.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANK B. BELL.

-Witnesses J. C. CARPENTER, THOMAS J. OBRIEN.

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