US1828426A - Rolling mill installation - Google Patents

Description

Oct. 20, 1931. M, A ,MQCREARY 1,828,426

ROLLING MILL INSTALLATION A Y Filed April 14, 1930 4 Sheets-Sheet l NjC) l jr .Z 45 'Ww-*O-G-o-O-O-O-oooooooooo Oct. 20, 1931. M. A. MCCRARY I ROLLING MILL INSTALLATION l Filed April 14. 1950 4 Sheets-Sheet 2 Oct. 20, 1931. M. A. MGCREARY 1,828,426

ROLLING MILL INSTALLATION Filed April 14. 195o sheets-sheet sv Oct. 20, 1931. M. A. MccREARY Y 1,828,426

ROLLING MILL INSTALLATION Filed April 14, 1950 4 SheetsSheet 4 @lg u m- Q N QQ N 25% w i Q QN fw.

8 8&1 8 O om Patented Oct. 20, 1931 UNITED-*STATES PATENT oFFlcE MILLER A. MCCREARY, F-DANV1LLE, rLLINoIs, ASSIGNOR To THE zinc COMPANY, or DANVILLE, ILLINOIS, a ooRronATIoN or 'ILLm'ois Y RoLLrNcl MILL Application flied April 14,

' This inventionA relates-to rolling Amill .installations particularly designed and adapted for rolling or :breaking-down. slabs of Zinc metalto form strips of suitable thick- V ness for coiling, comprising a rolling .mill proper, a rollerstable adapted for deliver-` ing slabs to the rolling mill, a catchers table adapted to receive the slabs after they have passed through the rolling mill, a return tal ble adaptedto receive slabs from the catchers table and to deiiver them at the front or entering side of the rolling lmill proper, and a slab Wheel adapted to deliver the slabs from thereturn tabletoithe rollers table to l5 be again passed through the rolling'mill, this operation being Arepeatedv until the slabs have been broken-downto aid'esiredthifckf. ness.

Considered broadly, all "of the 'foregoing features and elements. are old and Well known and Willreadily be lunderstood by persons familiar with the artifrom4 an in speetion of the drawings and Without a ole--r scription thereof in detail. f Y

As is generally Welllniown,`the operation of rolling or breaking down zinc slabs into strips of suitable thickness forl coiling, is: eiected by passing it through therolling mill as many times .as maybe necessaryfto :educe .it to the thickness desired, this operation, in accordance 'with the present invention, necessitating the d elivery,c' fL the slabs, after each rolling operation from fthe de-. livery to the entering side of the rollingmill, and a primary object ofthe 'invention nis to provide-,a rolling mill installation-` forV the purposes speciied, designedand adapted for etecting continuous rolling of a plurality of Zincslabs -a practicable number being. up to ten (10) which are successively passedK through. the rolling mill `in seri es. in which manual labor in handling the slabs is practically eliminated-excepting for. guiding the slabs and controlling their movementsthereby eiiecting a large saving in labor1 'cost ;l rendering the Work ottheoperatives morev efficient through reduced eifo'rt on their part; 1 and also rendering itfprac-ticable to operate on much heavier slabs than heretofore, all of which factors have resulted in largely inthe installation from the lower side of Fig.

iNsfrALLATIoN 1930,` sei-iai no. 444,258.

In the accompanying drawings, in which eo the invention is fully illustrated,

Fig. 1, 1 is a diagrammatic top plan view of a rollingmill installation embodying my' invention and improvements. l f

,'Fig..2, 2 is' adiagrammatic side view of -65 i, i. y y

Figz, 3. is a diagrammatic side view, corresponding substantially to Fig. 2, 2', of the return `table for delivering slabs after they have v passedk through the rolling mill,

Vfrom the rearto the front side of the rolling mill preliminary to making another pass.

' Fig. 4 is a sectional AView substantially on At-h'e'line +4 of Fig. l.

l Fig. 5 is adetached perspective View illustrating a stop control mechanism `for the slabs kas they are returnedto the front side' of the rolling mill afterk passing through the saine. 1'

y Fig. 6 is a detail diagrannnatio vievv on the line 6--6 of Fig. l. Y y

Fig. 7 is a similar View on the line 7 7 of Fig. v1 ;V and f Fig. 8 isa sectional View on the line 8-8 of Fig. l', illustrating means for imparting step-by-step rotation to the cooling Wheel.

For purposes oficlea'r and definite illustration and descriptionl Will 'assume that my improved rolling millinstallation isr designed and adapted for rolling orbreakingdown slabs substantially 5- ft. long X 10 in. Wide' X 2 in. thick and Which Weigh approximately 304 pounds. Obviously, however, the

dimensions andvveight of the slab admits of Wide variation 'depending upon the kind of strip which is to be produced.

A rolling mill installation embodying my invention and improvements comprisesa rollingmill, designated as a Whole, A. Rolling 10c mills suitable for the purpose may be purchased commercially and it is, therefore, unnecessary either to show or describe a rolling mill in detail.

Directly associated with the rolling mill A, one at the entering side and the other at the discharge side thereof, are tables designated, respectively, as a whole, B, B, the table B being adapted to support the slabs 1n position for delivering them between the rollers of the mill A, and the table B being positioned to receive slabs from said rolling mill. c

In accordance with common practice, the tables B, B may be variously constructed, for example, they may have smooth sheetmetal tops, either with or without rollers and may be either inclined` or horizontal. As shown, the rollers table B is downwardly inclined toward the rolling mill A and the catchers B is substantially horizontal, and both of said tables are equipped with idle or anti-friction rolls.

Tables B, B are old and well known and can readily be furnished by mechanics skilled in the art and it is, therefore, unnecessary either to show or describe said tables in dctail.

Having passed through the rolling mill A and been delivered upon the catchers table B, the slabs are adapted to be returned to the front or entering side of the rolling mill and again passed through the same until reduced or broken down to a desired thickness by suitable means provided for the purpose. As shown, said means are as follows: Positioned at one side of and in spaced relation to the rollers table B and catchers table B and extending lengthwise substantially co-v expansive therewith, is a return table C upon which the slabs, after each pass through the rolling mill, are adapted to be delivered from the catchers table B. As regards its general features, the table C is of substantially the same construction as the rollers and catchers tables B, B and can readily be supplied by persons skilled in the art, and need potl, therefore, be shown or described in deyai To provide for delivering slabs from the catchers table B upon the return table C without lifting them, the top of said return table C is positioned at a lower level than the top of the catchers table B, and extending from said catchers table to said return table are inclined skids or slides c, the relation bein g such that slabs pushed sideways from the catchers table B onto said skids or slides will decend along the same by gravity onto the table C, said table being provided with a spring stop o which project above the top of the table in position to stop said slabs and to define their position on said return table.

As shown, said spring stop c consists of a bar 1 supported at the side of the table C remote from the table B', said bar being supported at the upper ends of bars 2 pivoted to the floor or other supporting surface at their lower ends, and which are held yieldingly in position by rods 3 to which they are secured and which extend beneath the table C and through holes formed in fixed supporting bars 4 secured to the frame of the table C at the side thereof adjacent the table B. The pivot bars 2 -are yieldingly supported by coiled springs 5 inserted between the legs or supports 4 and nuts or other heads 6 on said rods 8.

The table C comprises sections C, C2, the section C being downwardly inclined to the horizontal from its extreme rear end to a point substantially in line with the front side of the housing of the rolling mill A, and the section C2 being substantially horizontal, the top surface thereof being only slightly above the floor or supporting surface on which the rolling mill A is erected, and considerably lower than the top surface of the rollers table B.

As shown, the table C is equipped with rollers which, for the most part, are idle, so that slabs delivered upon said table from the catchers table 1 will move along said table impelled by gravity only, or at most, will require very little force to move them endwise thereon. However, at about the lower end of the inclined section C of said table, there are a number of live rollers 02, which, as shown, are adapted to be driven by means of suitable driving connection with a motor 03, consisting, as indicated, of a counter-shaft 04, a pulley on which is belt connected with pulleys on the shafts of said rollers c2. As shown, said live rollers c2 are driven by a single belt adjusted back and forth over pulleys secured to the shafts of said live rollers and intermediate idle rollers rotatably mounted on suitable fixed studs, in a familiar manner. To provide for quickly and conveniently starting the rollers c2, and for stopping them when desired, the connection between the` armature shaft of the motor and the counter-shaft c4 is of a usual pulley and belt type. The pulley on the counter-shaft is relatively much larger than that on the armature shaft, in order to obtain a suitable speed reduction, and the pulley on the counter-shaft is adapted to be secured to and disengaged from said shaft by means of a suitable clutch adapted to be thrown in and out of engagement by means of a manually operable lever c6.

It is found in practice that when the clutch which drives the Counter-shaft c4 is thrown out, the inertia of the live rollers c2 and their llo driving connections will effectively brake A' slabs passing along the section C of the rcturn table, operating to stop and hold the same until the driving clutch therefor is again thrown in.

`scriptiorry without a; further Installation of suitable driving means for the live rollers c2, together with suitable clutch mechanism,l can readily be eftectedby skilled mechanics from, the foregoing dei description thereof in detail. v Y l The -motor 03, counter-shaft ci* andasseciated mechanism will be mounted below the tops of the skids or slides c positioned Ain the corresponding portion of the return table C,

while the clutch operating lever 06is acces- -sibly Amounted at the side of said'return table remote from the catchers tabley B', where it will not obstruct movement of slabs from v I said catchers table tothe return table.

" v Slabs on Vthe section C2 of thereturn table C, ,which is substantially co-eXtensive with the rollers table B, are adapted to be delivered from said return table to said rollers table to be again passed through the rolling inill'A, by means of what for convenience may be referred to as aslab or cooling wheel, designated as a whole, D, consisting of a shaft (Z rotatably mounted in suitable bearf ings formed on pillow blocks or pedestals cl.

" Secured to rotate with thc sliaftd 'are any desired number, as shown' eighteen, sets'or series of arms (Z2, the armsof each set or series fbeing.arranged tangent to circles concentric iviththeaxis of rotation of the shaft Z and spaced equalangular distances apart.

l/Vitlr the construction and relation ,de-V

scribed,inI whiclrthere are eighteen arms Z2 ineach set or series, theouter ends of `which ire spaced equal distances apart, it is obvious that diametrically "opposite arms will' be parallel with each other.

In operation, step-bysstep idapted to be imparted to the Yslab wheel D by means presently described, the relation being such that rotation of said coolingwheel in the direction indicated by the arrow, Figs.

6 and 7, will cause the outer ends of the arms Z2" to' pass upwardly through spaces cl3 formed between separated portions of the section C2 of the return table C, andthe relation being such, also, that during periods of rest of said cooling wheel, an arm cl2 of each l arms will extend substantially horizontal and will be `positioned in one of the spaces "d3 with its top edge slightly below the top of the section C2 of said return table. Vith this construction, 1t is .obvious that when a slab is supported upon the section G2 of the return table in line with the slabwheel C,` and rotation is imparted 'to said slab wheel, the 'setsofV arms dz'directly beneath said slabl will raise the same through what- ;ver arcsare traversed byV said arms at each intermittent actuation of said slab wheel.

and strengthened at their `inner `ends by rotatioir through arcs of predetermined length, is

thus rendering it possible for the rolling different sets or'- series of arms Z2 are secured to discs Z4 rigidly securedto theshaft cl of said wheel in any suitable manner, as by being bolted, welded,` brazed or otherwise `secured. thereto. Also, to impart desired strength, stiffness and rigidity'thereto, said discs are provided at .theirouter edges with flanges d5, which conveniently can be formed by a usualstampingor swedging operation. As shown, also','the arms AParereinforced gusset plates which connect them to the discs to which they are secured, respectively.

Slabs moving along thereturntable C, between thearinsor spokes cl2 of the slab wheel, are adapted to be stopped ,in different positions after their following ends have passed the housing of the roller mill A by suitable stops al provided for the purpose which are adapted to be manipulated manually by an operator. As shown, see particularly Fi gs. 1,', 3 and 5, said stops d6 are mounted in holes or openings [Z7 inthe different parts i into Vwhich the section C2 of the return table Cl isdivided by the spaces cl3, and consist of blocks 8 vsecured to stub shafts 7 rotatably mounted Vin anges formed at the lateral edges of the separate parts of the section C? of the return table C.l In operation, rotation is adapted to be imparted to said shafts to cause the free ends of the stop blocks `8 seicured thereto to project through the holes or` openings @Z7 above the top of the return table section C2, by means ofcam arms 9 secured to said shafts,which project into the path of movement of plates 10/secured to a bar l1 supported so as to be movable endwise and to which endwiserniovement is adapted toV be imparted by means of a manually operable lever 12 which is adapted to be secured in different adjusted positions corresponding to the setting of a desired` stop block (Z6, by a usual quadrant locking mechanism 13.

At each pass. of the slab through thc rolling'inill A, it will be broken Vdown or reduced in thickness and correspondingly lengthened and the slab or cooling wheel D is made of av length substantially equal tothe maximum length of the slabs when rolled or brokendown to their final thickness forcoiling. Thus, to save unnecessary handling of the slabs as they are delivered from the reas practicable after the following ends of said slabs have passed the housing of the roll ing mill A and, to effect this, a pluralitypof stops ZG is providedwhich become effective los in succession, beginning with the stop closest to the rolling mill and progressively farther therefrom, as the length of the slab increases. In accordance with my invention, I effect this by a construction in which said stops are set in succession beginning with the stop which is farthest from the rolling mill and progressively towards the same, until the stop corresponding to any given length of slab is set.

Thus, after thefirst pass of the slab through the rolling mill, all of the stops Will be set in succession beginning vWith the stop farthest from the rolling mill and progressively towards the same, the number of the stops set after each pass, being gradually reduced as the slab is broken down and becomes elongated until finally when the slab is fully broken down, only the extreme stop Will be Set- To provide for thus setting said stop blocks, the plates on the bar 11 which cooperate with the cam arms 9 on the shafts 7 to turn said shafts to raise the free ends of the stop blocks 8, are made of different lengths and are so spaced and positioned that said plates will contact With their corresponding cam arms to set the stop blocks controlled thereby, respectively, at different intervals in the movement of the bar 11, the lengths of said plates 10, respectively, being such, also, that when the bar 11 is moved to effect engagement of any cam arm 9 with its operating plate 10, said cam arm Will remain in engagement With said plate throughout the entire contemplated movement of said operating bar to set all of said stops. Y

Also, with the construction described, when all of said stops have been thus set, they may be released so as to permit their return to inoperative position, by endwise movement of the bar 11 in a reverse direction from its movement to set said stops, said stops also being released progressively in succession beginning With the stop nearest the rolling mill. As step-by-step rotation is imparted to the slab or cooling Wheel D, in operation, it is obvious that when the arms on which slabs are supported pass their vertical position, slabs supported thereby Will turn by gravity so that they will rest on the arms Z2 adjacent to and in front of arms or spokes on which said slab was initially supported and Will continue to rest upon and be supported by said arms until such time as said arms again pass horizontal position at the top side of the wheel and become downwardly inclined at such an angle that the slabs will slide off from the same by gravity. With this relation, it is obvious that by properly positioning the slab or cooling Wheel relative to the rollers table B, slabs discharged by gravity from said Wheel Will beV delivered from the slab or cooling Wheel D onto the rollers table B from being thrown OH from the same, said rollers table preferably Will be provided with spring stops or buffers which may be substantially similar in construction and operation to those applied to the return table C to prevent slabs delivered from the catchers table B onto said return table from being thrown off from said return table.

In accordance With my invention, step-bystep rotation is adapted to be imparted to the slab or cooling Wheel D by means as follows Secured to the shaft Z of said slab or cooling Wheel D so as to rotate therewith, is a ratchet Wheel 14 formed on opposite sides of Which are bearingsfitted to which, respectively, so as to turn freely thereon are rings 15, 15, which may be made of boiler plate or the like, both of which are pivotally connected, respectively, by links 16, 16 With a common pivot pin 17 secured in a pivoted lever 18.

The rings 15, 15 are each shaped to form projecting portions or lugs to which, respectively, the links 16, 16 are pivoted, said links being positioned on opposite sides of a vertic l cal line through the center of the ratchetl Wheel 14, and are proportioned so that they will project beyond the periphery of the teeth of the ratchet Wheel 14. Pivotally mounted upon the pivot pins Which connect the links 16, 16 to the rings l5, 15 respectively, in position to engage the teeth of the ratchet Wheel 14 are paWls 19, 19, the relation being such that upward movement of the free end of the lever 18 Will operate to advance the paWl 19 causing it to engage a tooth of the ratchet Wheel 14 and thereby impart rotation to said ratchet Wheel, and thus to the shaft d of the cooling Wheel, and to simultaneously retract the pavvl 19, While depression of the free end of the lever 18 will, in like manner, operate to advance the paWl 19 and to retract the pawl 19 into position to engage the next succeeding tooth of the ratchet Wheel, both pawls 19, 19 operating to rotate said ratchet Wheel and shaft in the same direction through equal arcs.

As installed for use, pivotal movement is adapted to be imparted to the lever 18 by means of a cylinder andpiston motor 20, opposite ends of the cylinder of Which are connected with a suitable source of supply of fluid under pressure by a supply pipe 21 and branch pipes 22 and 23, communication of the pipe 21 and branch pipes 22 and 23 being controlled by a manually operated three-way valve indicated at 24. As shown, the valve 24 is adapted to be operated by means of a hand lever 25 accessibly located adjacent to the rollers table B.

As shown, the ratchet Wheel 14 has nine teeth and the paWl actuating mechanism is so proportioned that at each full stroke of the piston of the motor 20, one of the pawls 19, 19, Will be advanced and the other pawl retracted through an arc equal to one-half lob ` assn'med :and Yheretofore described.

said-return tableC and deliver Y Lesegesspacing of the free ends of the-arms d? ofthe sl'abor cooling wheel/D yur'ider the conditions t Toprovideifor'adjusting the throwofithe pawls 1Q, 19,the lever 18 is provided at its pivoted end with a series of holes Q6, ar'- rangedy atfdifferent e distances `from thel pvot pin '17,fin`"whiclrsaid'pivot pinY is interchangeable. Thus, by shifting-the pivot pin from one" of thefholes 26A to another, it is obvious thatthe throw of the pawls Vmay be l' aried within considerable limits, to meet operatingconditions.

Y .'l" economize space and also to impart desired tall or pitch to theskids orslides c so that slabs willgdescend theysa'me lby gravity 'from thecatchers,l tableB onto the. return lt'a'lile Cj, saidir'etnrn table is installedat an angle'togthewiollerls table B and catcherls table BJidiverging from the end ofthe catchers table remoteromr the rolling mill A tolwardsl the slab` or cooling. wheelD, which-,as

shown, lis .tapered to #conform to the divergence of lthe return table C and the inclinationfof the rollers .table B. vDivergencefof the return` table Cl relative `to thet rollers table B .and catchers table is ,renderedv necinLorder-to provide afslab orfcooling wheel D of proper ysize to-raisethe slabs from them onto `the inclined rollerstablegB, i, Y y 1f Y I I Obviously, however, to meetvvdiierent relativecondit-ionsot installation,the s lab or cbolingwheel D may 'be straight or tapered, horizontal, or. inclined, tofreceive `trom returntable.`l horizontal or "inclined, and Lto deliver Avto fa '.rollersY table, horizontal orincl-inedl,`'in1any combination. l

f- In 'l accordance with;` usual practice, the catchers table Bf comprises apivoted section b which maybe raisedto provide fa space, in said "catchers t'ableB tor-al portable coiling machine?,indicated asiawhole, El j j- By zinctsla'bs'fas' used in Vthe foregoing specification and within the 'scopeand' contemplation koit my invention, `Vit is my intention 'to include zincalloysfwhich contain :sui-

icient qua-n'tities"o'zinc so that they retain tliee'ssentialphysical characteristics oi? zinc.

return table and automatically discharging them'npon the rollers table, f f V A- rolling millf installation? as Aspecified ranf'gedfbelowboth the rollersaiid catchers tables', and declinestowards the front `end of the installation.

8. A rolling mill installation as lspecified in claiml, in which the power actuated trans- 'fer'. means is manually controlled. 4

. ,A rolling mill installation as specilied in' claim l, in which the power actuatedtrans- 'er means'coinprisesa rotatable member and means for Vimparting step-by-step rotation i thereto. e

v5. In a rollingmill installation ofthe' type specified, the combination of a rollerstable, a return table, a slab-wheel positioned between sai-dreturntable and the rollers table,

comprising a shaft, `spaced series of arms secured to said shaft, each `series comprising the same number of arms all of `which are tangente to a circle-concentric lwith'the axis of said shaft, said return table being provided with spacedopenings positioned and prov portioned vto permit diiferent series of arms topass therethrough, respectively, and means applied to said shaft for imparting step-bvstep rotation to said slab wheel, the rollers l table and the shaft of the slab Wheel being positioned above the section ofthe return table in transverse alignment therewith.

6. A rolling mill installation as specilied in claim5, in which the means for imparting step-by-step rotation tothe slabwheel also comprisesmanually opera-ble control means.

7. A rolling millinstallationas specified in claim 5, which also'comprises a-catchers table positioned above vthe section of the with,"and said section of said returntable is y downwardly i inclined towards the slab wheel, said installation also comprising downwardly inclined skids from said catchers table to said return. table.`

l0. A rolling mill installationas specified in claiml 5, in which the. arms are so arranged that inpositions of rest ofthe slab wheel, an arm of each series will extend substantially horizontal and will be positioned only slightly'below the top of lthereturn table.

11. A rolling mill installationV as specified Vin claim 5, in whichtliere .is aneven number ofar'ms eachvseries of slab supporting arms and the relation is such that in positions of rest of' the slab wheel an arm of each series iio iis

45 when their following ends attain positions GQ 1 hed in claim 5, which also comprises a stop will extend substantially horizontal ,and will be only slightly below the top of the return table.

12. A rolling mill installation as specilied in claim 5, in which the slab wheel 1s so proportioned and positioned that as the arms thereof come into substantially horizontal position after passing over the top of the wheel, an arm of each series in front of said horizontal arm will be inclined downwardly at such an angle that a slab supported thereon will be delivered onto the rollers table by gravity. K

13. A rolling mill installation as. specified in claim 5, in which the slab wheel is so proportioned and positioned that the arms of one series come to rest finally at such an angle of inclination that a slab supported thereon will be delivered onto the rollers table by gravity.

14:. A rolling mill installation as spec-1- iied in claim 5, in whichV discs are secured to the slab Wheel shaft to which, respectively, different series of arms are secured.

15. A rolling mill installation as specified in claim 5, in which marginally flanged discs are secured to the shaft of the slab wheel to which, respectively, different series of arms are secured.

16. A rolling mill installation as lspecified in claim 5, in which the rollers table 1s downwardly inclined towards the rolling mill and the slab wheel is tapered and is installed with its large end remote from the rolling millV and its shaft diverging upwardly relative to the horizontal and laterally relative to the catchers tablein. a direction away from the rolling mill, and the return table also diverging from the rollers and catchers tables.

17. A rolling mill installationas specified in claim 5, which also comprisesa stop mechanism consisting of a series of movably supported stops adapted, respectively, to arrest movement of slabs along the Vreturn table in claim 5, which also comprises a stop mechanism consisting of a. series of movably supported stops adapted, respectively, to arrest movement of slabs along said'return table when their following ends attain positions in which they will clear the rolling mill, and means for setting said stops in succession beginning with the stop remote from the rolling mill.

19. A rolling mill installation as specimechanism consisting of a series of movably supported stops adapted, respectively, to arrest movement of slabs along said return table when their following ends attain positions in which they will clear the rolling mill, and manually operable means for setting said stops in succession.

20. A rolling mill installation as specified in claim 5, which also comprises a stop mech.- anism'consisting of a series of movably supported stops adapted, respectively, to arrest movement of slabs along said return table when their following ends attain positions in which they will clear the rolling mill, consisting of shafts rotatably mounted at the under side of the return table, stop blocks secured to said shafts, respectively, the relation being such that turning movement of said shafts will cause parts of said stop blocks to project above the return table, a manually operable lever and connection between said lever and stop shafts for turning said stop shafts pivotally.

21. A rolling mill installation as specified in claim 5, which also comprises a stop mechanism consisting of a series of movably supported stops adapted, respectively, to arrest Vmovement of slabs along said return table when their following ends attain positions in which they will clear the rolling mill, consistingof shafts rotatably mounted at the under side of the return table, cam arms secured to said stop shafts, a bar mounted so as to be movable endwise, cam plates secured thereto adapted, respectively, to engage the camV arms on said shafts, and an operating lever connected to said bar.

22. A rolling mill installation as specified in claim 5, which also comprises a stop mechanism consisting of a series of movably supported stops adapted, respectively, to arrest movement of slabs along said return table when their following ends attain positions in which they will clear the rolling mill, consisting of shafts rotatably mounted at the under side of the return table, cam arms secured to said stop shafts, a bar mounted so as to be movable endwise, cam plates secured thereto` adapted, respectively, to engage the cam arms on said shafts, and an operating lever connected to said bar, said cam plates being proportioned, respectively, to maintain all set stops in set position during the full setting stroke of the set lever.

23. A rolling mill installation as specified in claim 5, which also comprises a stop mechanism consisting of a series of movably supported stops adapted, respectively, to arrest movement of slabs along said return table when their following ends attain positions in which they will clear t-he rolling mill, consisting of shafts rotatably mounted at the under side of the return table, cam arms secured to said stop` shafts, a bar mounted so as toV be movable endwise, cam plates secured thereto adapted, respectively, tov engage the cam armson said shafts, and an operating le ver connected to said bar, said cam plates being proportioned, respectively, to maintain les all set stops in set position 'during the full setting stroke of the set lever, and the rela- `v tion being such that said stop blocks Will fall by gravity to inoperative position When their respective cam arms pass out of engagement with their respective cam plates upon reverse movement of the set lever.,

24. A rolling` mill installation as specified in claim 5, in which the return table comprises a clutch-driven live roller and means rendered operative by throwing out said Clutch for braking said roller to stop movement of a slab resting thereon.

25. A. rolling mill installation as specified in olaim 5, in Which the return table comprises a clutch-driven live roller, the inertia of said roller vvh-enV the clutch is thrown out operating as a brake to arrest movement of a slab resting thereon. Y,

26. A slab Wheel for the purpose specified, consisting of a shaft, spaced series of arms secured thereto, each series Comprising the same number of arms all of which are tangent to a circle eoncentriovvith the axis of the shaft.

In Witness that I claim t-he foregoing as my invention, I atix my signature this tenth day of April, 1930.

MILLER A. MGCREARY.

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